技术领域Technical Field
本发明涉及一种往复运动工具，该往复运动工具构成为使顶端工具呈直线状往复运动。The present invention relates to a reciprocating tool, which is configured to make a top tool reciprocate linearly.
背景技术Background technique
往复运动工具使顶端工具沿驱动轴线呈直线状往复运动。当驱动顶端工具时，在驱动轴线的延伸方向上产生比较大的振动。因此，已知一种具有用于减轻该振动的平衡锤的往复运动工具。例如，日本发明专利公开公报特开2013-13951号所记载的冲击工具具有：运动转换机构，其通过电机来驱动；和平衡锤，其被配置在壳体部件(内壳体)的内部空间，通过壳体部件以可绕摆动轴线摆动的方式被支承。平衡锤以可进行动作的方式连接于运动转换机构，通过运动转换机构以摆动轴线为支点进行摆动。The reciprocating tool causes the top tool to reciprocate in a straight line along the drive axis. When the top tool is driven, a relatively large vibration is generated in the extension direction of the drive axis. Therefore, a reciprocating tool having a counterweight for reducing the vibration is known. For example, the impact tool described in Japanese Patent Publication No. 2013-13951 has: a motion conversion mechanism, which is driven by a motor; and a counterweight, which is arranged in the internal space of a housing member (inner housing) and is supported by the housing member in a manner that allows it to swing around a swing axis. The counterweight is connected to the motion conversion mechanism in an actionable manner, and swings around the swing axis as a fulcrum through the motion conversion mechanism.
发明内容Summary of the invention
上述的壳体部件需要支承以可进行动作的方式连接于运动转换机构的平衡锤，因此受到设计上的制约。因此，从提高壳体部件的设计自由度的观点出发，平衡锤的支承结构存在进一步改善的余地。The housing member is required to support the counterweight connected to the motion conversion mechanism in an operable manner, and is therefore subject to design constraints. Therefore, from the perspective of increasing the degree of freedom in the design of the housing member, there is room for further improvement in the support structure of the counterweight.
鉴于上述的情况，本发明的非限定性的1个目的在于，提供一种涉及往复运动工具中的平衡锤的支承结构的改善。In view of the above circumstances, one non-limiting object of the present invention is to provide an improvement in the support structure of a counterweight in a reciprocating tool.
根据本发明的非限定性的1个方式，提供一种往复运动工具，该往复运动工具构成为，使顶端工具沿驱动轴线直线状往复运动。该往复运动工具具有电机、运动转换机构、主体壳体、内壳体、支承体和平衡锤。According to one non-limiting aspect of the present invention, there is provided a reciprocating tool configured to reciprocate a tip tool linearly along a drive axis, the reciprocating tool comprising a motor, a motion conversion mechanism, a main body housing, an inner housing, a support body, and a counterweight.
电机具有以可绕电机轴线旋转的电机轴。运动转换机构以可进行动作的方式与电机轴相连接。运动转换机构构成为，将旋转运动转换为沿着驱动轴线的直线往复运动。驱动轴线规定往复运动工具的前后方向。内壳体被配置在主体壳体内，收容运动转换机构的至少一部分。支承体独立于内壳体而形成，被安装于内壳体。平衡锤构成为，以可进行动作的方式连接于运动转换机构，通过运动转换机构来驱动。平衡锤通过支承体以可绕摆动轴线摆动的方式被支承，且至少局部被收容于内壳体，其中所述摆动轴线沿与驱动轴线正交的方向延伸。The motor has a motor shaft rotatable around a motor axis. The motion conversion mechanism is connected to the motor shaft in an actionable manner. The motion conversion mechanism is configured to convert rotational motion into linear reciprocating motion along a drive axis. The drive axis defines the front-to-rear direction of the reciprocating tool. The inner housing is arranged in the main housing and accommodates at least a portion of the motion conversion mechanism. The support body is formed independently of the inner housing and is mounted on the inner housing. The balance hammer is configured to be connected to the motion conversion mechanism in an actionable manner and is driven by the motion conversion mechanism. The balance hammer is supported by the support body in a swingable manner around a swing axis and is at least partially accommodated in the inner housing, wherein the swing axis extends in a direction orthogonal to the drive axis.
本方式的往复运动工具具有通过运动转换机构驱动的平衡锤。因此，平衡锤能够有效地减轻往复驱动顶端工具时产生的振动。另外，该平衡锤并不是被内壳体支承，而是通过独立于内壳体而形成且被安装于内壳体的支承体来支承。因此，在内壳体无需设置平衡锤的支承结构。据此，能够提高内壳体的设计自由度。The reciprocating tool of this method has a counterweight driven by a motion conversion mechanism. Therefore, the counterweight can effectively reduce the vibration generated when the top tool is reciprocated. In addition, the counterweight is not supported by the inner housing, but is supported by a support body formed independently of the inner housing and mounted on the inner housing. Therefore, it is not necessary to set a supporting structure for the counterweight in the inner housing. Accordingly, the design freedom of the inner housing can be improved.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是锤钻的立体图。FIG. 1 is a perspective view of a hammer drill.
图2是锤钻的剖视图。FIG. 2 is a cross-sectional view of the hammer drill.
图3是图2的局部放大图。FIG. 3 is a partial enlarged view of FIG. 2 .
图4是内壳体的立体图。FIG. 4 is a perspective view of the inner housing.
图5是安装有内壳体的支承体和驱动机构的立体图。FIG. 5 is a perspective view of a support body and a drive mechanism mounted with an inner housing.
图6是图2的另一局部放大图。FIG. 6 is another partially enlarged view of FIG. 2 .
图7是图3的VII-VII剖视图。FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 3 .
图8是被支承于支承体的平衡锤的立体图。FIG. 8 is a perspective view of a counterweight supported by a support body.
图9是安装有支承体和平衡锤的驱动机构的立体图。FIG. 9 is a perspective view of a driving mechanism to which a support body and a counterweight are installed.
图10是图2的又一局部放大图。FIG. 10 is another partial enlarged view of FIG. 2 .
附图标记说明Description of Reference Numerals
1：锤钻；10：主体壳体；101：第1空间；102：第2空间；105：吸气口；106：导向肋；107：排气口；11：第1壳体部；111：圆筒部；113：开口；15：第2壳体部；151：上半部；153：下半部；17：手柄；171：把持部；173：扳机；175：开关；20：内壳体；200：内部空间；201：开口；202：周壁部；203：后壁部；204：槽；205：突出部；207：筒状部；208：过滤器；22：支承体；221：主体部；223：臂部；224：支承孔；225：支承轴；23：轴承支承部件；230：开口；24：排气孔；241：入口；242：出口；25：凹部；251：开口；28：密封部件；30：控制器；31：电机；310：电机主体部；315：电机轴；321：轴承；323：轴承；33：第1锥齿轮；331：齿轮齿；35：风扇；4：驱动机构；40：主轴；401：轴承；402：轴承；41：工具保持架；410：开口；42：气缸；5：冲击机构；51：运动转换机构；52：中间轴；521：轴承；522：轴承；53：第2锥齿轮；531：齿轮齿；533：安装部；54：旋转体；55：摆动部件；550：环形部；551：摆动臂；552：突起；57：活塞；571：后端部；573：连接销；58：冲击结构要素；581：撞锤；583：撞栓；59：空气室；6：旋转传递机构；61：驱动齿轮；63：从动齿轮；7：平衡锤；71：支承孔；73：卡合孔；91：顶端工具；93：电池；DX：驱动轴线；MX：电机轴线；PX：摆动轴线；RX：旋转轴线。1: hammer drill; 10: main body shell; 101: first space; 102: second space; 105: air inlet; 106: guide rib; 107: exhaust port; 11: first shell portion; 111: cylinder portion; 113: opening; 15: second shell portion; 151: upper half; 153: lower half; 17: handle; 171: grip portion; 173: trigger; 175: switch; 20: inner shell; 200: internal space; 201: opening; 202: peripheral wall portion; 20 3: rear wall; 204: groove; 205: protrusion; 207: cylindrical portion; 208: filter; 22: support body; 221: main body; 223: arm; 224: support hole; 225: support shaft; 23: bearing support member; 230: opening; 24: exhaust hole; 241: inlet; 242: outlet; 25: recess; 251: opening; 28: sealing member; 30: controller; 31: motor; 310: motor main body; 315: motor shaft; 3 21: bearing; 323: bearing; 33: first bevel gear; 331: gear teeth; 35: fan; 4: drive mechanism; 40: spindle; 401: bearing; 402: bearing; 41: tool holder; 410: opening; 42: cylinder; 5: impact mechanism; 51: motion conversion mechanism; 52: intermediate shaft; 521: bearing; 522: bearing; 53: second bevel gear; 531: gear teeth; 533: mounting portion; 54: rotating body; 55: swinging member; 55 0: annular portion; 551: swing arm; 552: protrusion; 57: piston; 571: rear end portion; 573: connecting pin; 58: impact structural element; 581: hammer; 583: striker; 59: air chamber; 6: rotation transmission mechanism; 61: driving gear; 63: driven gear; 7: balance hammer; 71: supporting hole; 73: engaging hole; 91: top tool; 93: battery; DX: driving axis; MX: motor axis; PX: swing axis; RX: rotation axis.
具体实施方式Detailed ways
在本发明的非限定性的一实施方式中，平衡锤可以通过沿摆动轴线延伸的支承轴支承于支承体。支承轴可以被配置于内壳体的内部空间。另外，在此所谓的内壳体的内部空间是指被内壳体的外部轮廓(壁部)包围的空间。根据该实施方式，能够将通过支承轴被支承体支承的平衡锤的至少一部分容易地配置在内壳体的内部。In a non-limiting embodiment of the present invention, the counterweight can be supported on the support body via a support shaft extending along the swing axis. The support shaft can be arranged in the internal space of the inner housing. In addition, the internal space of the inner housing refers to the space surrounded by the outer contour (wall portion) of the inner housing. According to this embodiment, at least a portion of the counterweight supported by the support body via the support shaft can be easily arranged inside the inner housing.
除了上述实施方式以外，或者代替上述实施方式，支承体可以包括：主体部，其至少局部被配置在内壳体的外部；和臂部，其从主体部向内壳体的内部突出，支承支承轴。根据该实施方式，能容易地将支承于臂部的支承轴配置在内壳体的内部。In addition to the above embodiment, or in place of the above embodiment, the support body may include: a main body portion, which is at least partially arranged outside the inner shell; and an arm portion, which protrudes from the main body portion to the inside of the inner shell and supports the support shaft. According to this embodiment, the support shaft supported by the arm portion can be easily arranged inside the inner shell.
除了上述实施方式以外，或者代替上述实施方式，往复运动工具可以具有密封部件，所述密封部件被配置在主体壳体与内壳体之间。密封部件可以在前后方向上被配置在比平衡锤的摆动轴线靠前方的位置。在内壳体支承平衡锤的公知的结构中，为了对平衡锤的支承部进行润滑，密封部件被配置在比平衡锤的摆动轴线靠后方的位置。与此相对，在该实施方式中，密封部件被配置在比摆动轴线靠前方的位置，因此，能够增大内壳体中的位于比密封部件靠后方的部分的表面积。据此，能够有效地对内壳体进行冷却。In addition to the above-described embodiment, or in place of the above-described embodiment, the reciprocating tool may have a sealing component, which is disposed between the main housing and the inner housing. The sealing component may be disposed in a position forward of the swing axis of the counterweight in the front-rear direction. In a known structure in which the inner housing supports the counterweight, the sealing component is disposed in a position rearward of the swing axis of the counterweight in order to lubricate the supporting portion of the counterweight. In contrast, in this embodiment, the sealing component is disposed in a position forward of the swing axis, thereby increasing the surface area of the portion of the inner housing that is located rearward of the sealing component. Accordingly, the inner housing can be effectively cooled.
除了上述实施方式以外，或者代替上述实施方式，摆动轴线的延伸方向可以规定往复运动工具的左右方向。与前后方向及左右方向正交的方向可以规定往复运动工具的上下方向。主体壳体可以具有在上下方向上形成于比密封部件的上端靠上方的吸气口、和在上下方向上形成于比密封部件的下端靠下方的排气口。根据该实施方式，通过经由吸气口流入主体壳体且经由排气口从主体壳体流出的空气，有效地对内壳体进行冷却。In addition to the above-described embodiment, or in place of the above-described embodiment, the extending direction of the swing axis may define the left-right direction of the reciprocating tool. The direction orthogonal to the front-rear direction and the left-right direction may define the up-down direction of the reciprocating tool. The main body shell may have an air intake port formed above the upper end of the sealing member in the up-down direction, and an air exhaust port formed below the lower end of the sealing member in the up-down direction. According to this embodiment, the inner shell is effectively cooled by air flowing into the main body shell through the air intake port and flowing out of the main body shell through the air exhaust port.
除了上述实施方式以外，或者代替上述实施方式，往复运动工具还可以具有顶端工具保持部件、和被配置在顶端工具保持部件的内部的冲击结构要素。顶端工具保持部件可以构成为，以能够沿驱动轴线移动的方式来保持顶端工具。冲击结构要素可以构成为，通过运动转换机构来驱动，对顶端工具施加冲击力。即，往复运动工具可以构成为冲击工具。支承体可以构成为支承顶端工具保持部件。根据该实施方式，能够有效地使用将平衡锤可摆动地进行支承的支承体，来支承顶端工具保持部件。In addition to the above-mentioned embodiment, or in place of the above-mentioned embodiment, the reciprocating tool may also have a top tool holding component and an impact structural element arranged inside the top tool holding component. The top tool holding component may be configured to hold the top tool in a manner that allows it to move along the drive axis. The impact structural element may be configured to apply an impact force to the top tool when driven by a motion conversion mechanism. That is, the reciprocating tool may be configured as an impact tool. The support body may be configured to support the top tool holding component. According to this embodiment, the support body that supports the counterweight in a swingable manner can be effectively used to support the top tool holding component.
除了上述实施方式以外，或者代替上述实施方式，往复运动工具还可以具有中间轴，所述中间轴以可进行动作的方式连接于电机轴，能够绕与驱动轴线平行地延伸的旋转轴线旋转。运动转换机构的一部分可以配置在中间轴上。根据该实施方式，能够实现具有平衡锤的紧凑的冲击工具。In addition to or in place of the above-described embodiment, the reciprocating tool may further include an intermediate shaft that is movably connected to the motor shaft and is rotatable about a rotation axis extending parallel to the drive axis. A portion of the motion conversion mechanism may be disposed on the intermediate shaft. According to this embodiment, a compact impact tool having a counterweight can be realized.
除了上述实施方式以外，或者代替上述实施方式，电机轴线可以与中间轴的旋转轴线交叉。根据该实施方式，实现L字型的冲击工具。In addition to or instead of the above embodiment, the motor axis may intersect with the rotation axis of the intermediate shaft. According to this embodiment, an L-shaped impact tool is realized.
除了上述实施方式以外，或者代替上述实施方式，摆动轴线的延伸方向可以规定往复运动工具的左右方向。与前后方向及所述左右方向正交的方向可以规定往复运动工具的上下方向。主体壳体可以具有吸气口和排气口。吸气口在上下方向上可以形成于比驱动轴线靠上方的位置。根据该实施方式，通过经由吸气口流入主体壳体且经由排气口从主体壳体流出的空气，来有效地对内壳体进行冷却。In addition to the above-described embodiment, or in place of the above-described embodiment, the extension direction of the swing axis can define the left-right direction of the reciprocating tool. The direction orthogonal to the front-rear direction and the left-right direction can define the up-down direction of the reciprocating tool. The main body shell can have an air intake port and an air exhaust port. The air intake port can be formed at a position above the drive axis in the up-down direction. According to this embodiment, the inner shell is effectively cooled by air flowing into the main body shell through the air intake port and flowing out of the main body shell through the air exhaust port.
除了上述实施方式以外，或者代替上述实施方式，在主体壳体的内部规定出从吸气口流入的空气沿内壳体流动，通过电机的内部且从排气口流出的流路。根据该实施方式，能够通过经由吸气口流入主体壳体且经由排气口从主体壳体流出的空气，来有效地对内壳体和电机进行冷却。In addition to the above embodiment, or in place of the above embodiment, a flow path is defined inside the main body shell, in which the air flowing in from the air inlet flows along the inner shell, passes through the inside of the motor, and flows out from the exhaust port. According to this embodiment, the inner shell and the motor can be effectively cooled by the air flowing into the main body shell through the air inlet and flowing out from the main body shell through the exhaust port.
下面，参照图1～图10对本发明的代表性且非限定性的实施方式所涉及的锤钻1进行说明。锤钻1是能够进行冲击动作的电动工具。冲击动作是指，冲击以可拆卸的方式被保持的顶端工具91，使其沿着驱动轴线DX呈直线状往复的动作。即，锤钻1是往复运动工具一例，还是冲击工具一例。另外，锤钻1在进行冲击动作的同时能够进行旋转动作，或者还能够独立于冲击动作而进行旋转动作。旋转动作是指驱动顶端工具91使其绕驱动轴线DX旋转的动作。Hereinafter, a hammer drill 1 involved in a representative and non-limiting embodiment of the present invention will be described with reference to FIGS. 1 to 10 . The hammer drill 1 is an electric tool capable of performing an impact action. The impact action refers to the action of impacting a top tool 91 held in a detachable manner so as to reciprocate linearly along a drive axis DX. That is, the hammer drill 1 is an example of a reciprocating tool or an example of an impact tool. In addition, the hammer drill 1 can perform a rotational action while performing an impact action, or can also perform a rotational action independently of the impact action. The rotational action refers to the action of driving the top tool 91 to rotate it around the drive axis DX.
首先，说明锤钻1的概略结构。如图1、图2所示，锤钻1的外部轮廓由主体壳体10、和连接于主体壳体10的手柄17形成。First, a schematic structure of the hammer drill 1 will be described. As shown in FIGS. 1 and 2 , the outer contour of the hammer drill 1 is formed by a main body case 10 and a handle 17 connected to the main body case 10 .
主体壳体10是还被称为工具主体或者外壳的中空体。本实施方式的主体壳体10包括第1壳体部11和第2壳体部15。The main body housing 10 is a hollow body also called a tool body or a housing. The main body housing 10 of the present embodiment includes a first housing portion 11 and a second housing portion 15 .
如图2所示，第1壳体部11是主要收容作为顶端工具保持部件的主轴40和顶端工具91的驱动机构4的部分。主轴40是长形的筒状部件。主轴40的长轴方向的一端部构成为将顶端工具91可拆卸地进行保持的工具保持架41。工具保持架41(主轴40)的长轴规定顶端工具91的驱动轴线DX。As shown in FIG2 , the first housing portion 11 is a portion that mainly accommodates the spindle 40 as a top tool holding member and the driving mechanism 4 of the top tool 91. The spindle 40 is a long cylindrical member. One end of the spindle 40 in the long axis direction is configured as a tool holder 41 that detachably holds the top tool 91. The long axis of the tool holder 41 (spindle 40) defines the drive axis DX of the top tool 91.
第1壳体部11沿驱动轴线DX延伸。第1壳体部11在驱动轴线DX的延伸方向上的一端部形成为圆筒状，工具保持架41被收容于该部分(还被称为圆筒部(barrel department)111)。第1壳体部11的其余部分是比圆筒部111大的筒状，与圆筒部111相反的一侧的一端规定开口113。金属制的内壳体20嵌入规定第1壳体部11的开口113的端部，而堵塞开口113。据此，规定出被内壳体20和第1壳体部11包围的第1空间101。主轴40和驱动机构4被配置在该第1空间101。因此，第1壳体部11和内壳体20的整体也可以形成收容主轴40和驱动机构4的1个壳体(所谓的齿轮壳体)。The first housing portion 11 extends along the drive axis DX. One end of the first housing portion 11 in the extension direction of the drive axis DX is formed into a cylindrical shape, and the tool holder 41 is accommodated in this portion (also referred to as a barrel portion 111). The rest of the first housing portion 11 is a cylindrical shape larger than the barrel portion 111, and an opening 113 is defined at one end on the opposite side of the barrel portion 111. The metal inner housing 20 is embedded in the end defining the opening 113 of the first housing portion 11, thereby blocking the opening 113. Accordingly, a first space 101 surrounded by the inner housing 20 and the first housing portion 11 is defined. The spindle 40 and the drive mechanism 4 are arranged in the first space 101. Therefore, the first housing portion 11 and the inner housing 20 as a whole can also form a housing (so-called gear housing) that accommodates the spindle 40 and the drive mechanism 4.
第2壳体部15是主要收容电机31的部分，连接于第1壳体部11的一端部，且沿与驱动轴线DX交叉(详细而言，大致正交)的方向延伸。包括第1壳体部11和第2壳体部15的主体壳体10的整体形成为L字状。第2壳体部15的一部分从外侧覆盖内壳体20。The second housing portion 15 is a portion that mainly accommodates the motor 31, is connected to one end of the first housing portion 11, and extends in a direction that intersects (in detail, is substantially orthogonal to) the drive axis DX. The main housing 10 including the first housing portion 11 and the second housing portion 15 is formed in an L-shape as a whole. A portion of the second housing portion 15 covers the inner housing 20 from the outside.
手柄17是整体呈U字形的中空部件，其两端连接于主体壳体10(第2壳体部15)。手柄17包括供使用者把持的把持部171。把持部171沿与驱动轴线DX交叉的方向(详细而言，大致正交的方向)延伸。在把持部171设置有供使用者按压操作的扳机173。在把持部171内收容有开关175。在手柄17的下端部收容有用于控制锤钻1的动作的控制器30。另外，在手柄17的下端部以可拆卸的方式安装有电池93。当开关175响应于扳机173的按压操作而接通时，通过控制器30开始电机31的驱动，通过驱动机构4来驱动顶端工具91。The handle 17 is a hollow component that is U-shaped as a whole, and its two ends are connected to the main body shell 10 (the second shell part 15). The handle 17 includes a gripping portion 171 for the user to hold. The gripping portion 171 extends in a direction that intersects with the drive axis DX (in detail, a direction that is approximately orthogonal). A trigger 173 that is pressed by the user is provided on the gripping portion 171. A switch 175 is accommodated in the gripping portion 171. A controller 30 for controlling the action of the hammer drill 1 is accommodated at the lower end of the handle 17. In addition, a battery 93 is detachably mounted at the lower end of the handle 17. When the switch 175 is turned on in response to the pressing operation of the trigger 173, the driving of the motor 31 is started by the controller 30, and the top tool 91 is driven by the driving mechanism 4.
下面，说明锤钻1的详细结构。另外，在以下的说明中，为了便于说明，将驱动轴线DX的延伸方向规定为锤钻1的前后方向。在前后方向上，将工具保持架41的顶端侧(插入顶端工具91的一侧)规定为锤钻1的前侧，将与前侧相反的一侧规定为后侧。另外，将与驱动轴线DX正交且与第2壳体部15的延伸方向(还是把持部171的延伸方向)大致对应的方向规定为锤钻1的上下方向。在上下方向上，将靠向第1壳体部11的方向规定为上方向，将远离第1壳体部11的方向规定为下方向。并且，将与前后方向及上下方向正交的方向规定为左右方向。Next, the detailed structure of the hammer drill 1 is described. In addition, in the following description, for the sake of convenience, the extension direction of the drive axis DX is defined as the front-to-back direction of the hammer drill 1. In the front-to-back direction, the top side of the tool holder 41 (the side where the top tool 91 is inserted) is defined as the front side of the hammer drill 1, and the side opposite to the front side is defined as the rear side. In addition, the direction that is orthogonal to the drive axis DX and roughly corresponds to the extension direction of the second housing portion 15 (also the extension direction of the grip portion 171) is defined as the up-down direction of the hammer drill 1. In the up-down direction, the direction toward the first housing portion 11 is defined as the upper direction, and the direction away from the first housing portion 11 is defined as the lower direction. Furthermore, the direction orthogonal to the front-to-back direction and the up-down direction is defined as the left-right direction.
首先，对主体壳体10和内壳体20的详细结构进行说明。First, the detailed structures of the main body housing 10 and the inner housing 20 will be described.
如上所述，第1壳体部11为整体呈筒状的部件，后端部的开口113被内壳体20堵塞。如图3～图5所示，内壳体20是具有开口201和内部空间200的中空体。内壳体20以开口201朝向前方的方式来配置，嵌入规定第1壳体部11的开口113的后端部。更详细而言，内壳体20包括规定开口201的筒状的周壁部202、和从周壁部202连续的后壁部203。内部空间200是前方敞开，通过周壁部202包围绕驱动轴线DX的周向，且通过后壁部203堵塞后方的空间。As described above, the first housing portion 11 is a component that is cylindrical as a whole, and the opening 113 at the rear end is blocked by the inner housing 20. As shown in Figures 3 to 5, the inner housing 20 is a hollow body having an opening 201 and an internal space 200. The inner housing 20 is configured in a manner that the opening 201 faces the front, and is embedded in the rear end portion of the opening 113 that defines the first housing portion 11. In more detail, the inner housing 20 includes a cylindrical peripheral wall portion 202 that defines the opening 201, and a rear wall portion 203 that is continuous from the peripheral wall portion 202. The internal space 200 is open to the front, surrounded by the peripheral wall portion 202 in the circumferential direction of the drive axis DX, and the rear space is blocked by the rear wall portion 203.
在周壁部202的外表面中的与开口201相邻而沿周向延伸的环状的区域，形成有环状的槽204。在内壳体20的槽204中安装有环状的密封部件28。密封部件28例如由环状的弹性体(例如，树脂制的O形环)构成。密封部件28以压缩状态被配置在第1壳体部11的后端部的内表面与内壳体20的周壁部202的外表面之间，堵塞第1壳体部11与内壳体20之间的间隙。据此，通过第1壳体部11和内壳体20规定出封闭的第1空间101。在第1空间101中收容有润滑剂(例如，油脂)，并且收容有主轴40和驱动机构4。An annular groove 204 is formed in an annular region of the outer surface of the peripheral wall portion 202 that is adjacent to the opening 201 and extends in the circumferential direction. An annular sealing member 28 is installed in the groove 204 of the inner housing 20. The sealing member 28 is composed of, for example, an annular elastic body (for example, an O-ring made of resin). The sealing member 28 is arranged in a compressed state between the inner surface of the rear end portion of the first housing portion 11 and the outer surface of the peripheral wall portion 202 of the inner housing 20 to block the gap between the first housing portion 11 and the inner housing 20. Accordingly, a closed first space 101 is defined by the first housing portion 11 and the inner housing 20. A lubricant (for example, grease) is contained in the first space 101, and the main shaft 40 and the drive mechanism 4 are contained.
如图1、图2所示，第2壳体部15是连接于第1壳体部11的后端部且沿上下方向延伸的中空体。第2壳体部15的上半部151利用螺钉连接于第1壳体部11的后端部。另外，在本实施方式中，第2壳体部15通过在左右方向上分割开的2个对开体利用螺钉相互连接而形成。在第2壳体部15的上半部151的内部，配置有嵌入第1壳体部11的后端部的内壳体20。另外，在第2壳体部15的下半部153(即，在内壳体20的收容部的下方延伸的部分)收容有电机31。As shown in Fig. 1 and Fig. 2, the second housing portion 15 is a hollow body connected to the rear end portion of the first housing portion 11 and extending in the up-down direction. The upper half 151 of the second housing portion 15 is connected to the rear end portion of the first housing portion 11 by screws. In addition, in the present embodiment, the second housing portion 15 is formed by connecting two halves divided in the left-right direction to each other by screws. Inside the upper half 151 of the second housing portion 15, an inner housing 20 embedded in the rear end portion of the first housing portion 11 is arranged. In addition, the motor 31 is accommodated in the lower half 153 of the second housing portion 15 (i.e., the portion extending below the accommodating portion of the inner housing 20).
根据以上那样的结构，在主体壳体10的内部形成有由内壳体20划分出的2个空间，即收容有润滑剂和主轴40及驱动机构4的第1空间101、和主要收容电机31的第2空间102。第1空间101和第2空间102可以通过被配置在内壳体20与主体壳体10(第1壳体部11)之间的密封部件28相隔离。According to the above structure, two spaces divided by the inner housing 20 are formed inside the main housing 10, namely, the first space 101 containing the lubricant, the main shaft 40 and the drive mechanism 4, and the second space 102 mainly containing the motor 31. The first space 101 and the second space 102 can be isolated by the sealing member 28 arranged between the inner housing 20 and the main housing 10 (the first housing portion 11).
下面，对被配置在主体壳体10的内部的结构要素(结构)进行说明。Next, the components (structures) arranged inside the main body casing 10 will be described.
首先，对电机31进行说明。如图2所示，电机31被收容于第2壳体部15的下半部153。电机31具有包括定子及转子的电机主体部310、和电机轴315。电机轴315是能够与转子一体地绕电机轴线MX旋转的轴，从转子突出。在本实施方式中，电机31以电机轴线MX相对于锤钻1的上下方向略微倾斜地延伸，且倾斜地与驱动轴线DX交叉的方式来配置。然而，电机31也可以以电机轴线MX与驱动轴线DX正交且沿上下方向延伸的方式来配置。First, the motor 31 is described. As shown in FIG. 2 , the motor 31 is housed in the lower half 153 of the second housing portion 15. The motor 31 includes a motor body 310 including a stator and a rotor, and a motor shaft 315. The motor shaft 315 is a shaft that can rotate around the motor axis MX integrally with the rotor, and protrudes from the rotor. In the present embodiment, the motor 31 is configured such that the motor axis MX extends slightly obliquely relative to the vertical direction of the hammer drill 1 and obliquely intersects with the drive axis DX. However, the motor 31 may also be configured such that the motor axis MX is orthogonal to the drive axis DX and extends in the vertical direction.
在电机轴315的上端部连接有第1锥齿轮(bevel gear)33。第1锥齿轮33与电机轴315一体地旋转。电机轴315通过2个轴承321、323以可旋转的方式来支承。上侧的轴承321被支承于内壳体20的下后端部，将电机轴315的上端部可旋转地进行支承。第1锥齿轮33的齿部被配置在内壳体20的内部。另外，齿部是第1锥齿轮33中的形成有齿轮齿331(参照图3)的部分。下侧的轴承323被支承于第2壳体部15，在电机主体部310的下方将电机轴315可旋转地进行支承。The first bevel gear 33 is connected to the upper end of the motor shaft 315. The first bevel gear 33 rotates integrally with the motor shaft 315. The motor shaft 315 is rotatably supported by two bearings 321 and 323. The upper bearing 321 is supported at the lower rear end of the inner housing 20, and rotatably supports the upper end of the motor shaft 315. The tooth portion of the first bevel gear 33 is arranged inside the inner housing 20. In addition, the tooth portion is a portion of the first bevel gear 33 where gear teeth 331 (refer to Figure 3) are formed. The lower bearing 323 is supported by the second housing portion 15, and rotatably supports the motor shaft 315 below the motor body 310.
在电机轴315的下端部(比轴承323向下方延伸的部分)固定有用于冷却电机31的风扇35。风扇35与电机轴315一体地旋转，据此产生空气流动(冷却风)，该空气流动从吸气口105流入主体壳体10内，通过电机31从排气口107向主体壳体10的外部流出。A fan 35 for cooling the motor 31 is fixed to the lower end of the motor shaft 315 (the portion extending downward from the bearing 323). The fan 35 rotates integrally with the motor shaft 315, thereby generating air flow (cooling wind), which flows into the main body housing 10 from the air intake port 105 and flows out from the air outlet 107 to the outside of the main body housing 10 through the motor 31.
如图1、图2所示，在本实施方式中，吸气口105形成于第2壳体部15的上端部(上壁部)。更详细而言，吸气口105在前后方向上被配置在比密封部件28靠后方且比内壳体20的后端靠前方的位置。即，吸气口105被配置在内壳体20的正上方。排气口107形成于第2壳体部15的下端部。更详细而言，排气口107被配置在第2壳体部15的左侧部和右侧部的下端部。As shown in Fig. 1 and Fig. 2, in the present embodiment, the air intake port 105 is formed at the upper end portion (upper wall portion) of the second housing portion 15. More specifically, the air intake port 105 is arranged at a position that is more rearward than the sealing member 28 and more forward than the rear end of the inner housing 20 in the front-rear direction. That is, the air intake port 105 is arranged directly above the inner housing 20. The exhaust port 107 is formed at the lower end portion of the second housing portion 15. More specifically, the exhaust port 107 is arranged at the lower end portions of the left and right sides of the second housing portion 15.
通过这样配置吸气口105和排气口107，在第2空间102规定出空气的流路。具体而言，通过风扇35的旋转驱动，从吸气口105吸入第2壳体部15的上半部151内的空气在第2壳体部15的内表面与内壳体20的外表面之间沿着内壳体20向下方流动。该空气还通过配置在下半部153内的电机31的定子与转子之间到达风扇35。从风扇35送出的空气被从排气口107向第2壳体部15的外部流出。By configuring the air intake port 105 and the air exhaust port 107 in this way, an air flow path is defined in the second space 102. Specifically, by the rotational drive of the fan 35, the air sucked into the upper half 151 of the second housing portion 15 from the air intake port 105 flows downward along the inner housing 20 between the inner surface of the second housing portion 15 and the outer surface of the inner housing 20. The air also reaches the fan 35 through the stator and the rotor of the motor 31 arranged in the lower half 153. The air sent from the fan 35 flows out from the exhaust port 107 to the outside of the second housing portion 15.
另外，在本实施方式中，如图3所示，在第2壳体部15的内部，与吸气口105相邻设置有导向肋106。导向肋106构成为，使通过吸气口105流入第2壳体部15的空气流向前方。具体而言，导向肋106的下部随着靠向下方而向前方倾斜。因此，从吸气口105流入的空气被向安装有密封部件28的部分的一方引导。In addition, in the present embodiment, as shown in FIG3 , a guide rib 106 is provided inside the second housing portion 15 adjacent to the air inlet 105. The guide rib 106 is configured to allow the air flowing into the second housing portion 15 through the air inlet 105 to flow forward. Specifically, the lower portion of the guide rib 106 is inclined forward as it approaches downward. Therefore, the air flowing in from the air inlet 105 is guided toward one side of the portion where the sealing member 28 is installed.
下面，对主轴40进行说明。Next, the main shaft 40 will be described.
如图3所示，本实施方式的主轴40是长形的带有台阶的圆筒部件，在第1空间101的上半部以沿前后方向延伸的方式被支承。As shown in FIG. 3 , the main shaft 40 of the present embodiment is a long stepped cylindrical member, and is supported in the upper half of the first space 101 so as to extend in the front-rear direction.
主轴40的前半部分构成工具保持架41。顶端工具91以其长轴与驱动轴线DX一致的方式被从工具保持架41的前端的开口410插入，且保持在被允许相对于工具保持架41在轴向上移动并且绕轴线的旋转被限制的状态。主轴40的后半部分构成将活塞57的气缸42可滑动地进行保持。另外，在本实施方式中，主轴40是工具保持架41和气缸42一体地形成的单一部件。但是，主轴40也可以通过多个独立的部件相互连接来形成。The front half of the spindle 40 constitutes the tool holder 41. The top tool 91 is inserted from the opening 410 at the front end of the tool holder 41 in such a manner that its long axis is consistent with the drive axis DX, and is held in a state in which it is allowed to move in the axial direction relative to the tool holder 41 and the rotation around the axis is restricted. The rear half of the spindle 40 constitutes the cylinder 42 that slidably holds the piston 57. In addition, in the present embodiment, the spindle 40 is a single component in which the tool holder 41 and the cylinder 42 are integrally formed. However, the spindle 40 may also be formed by connecting a plurality of independent components to each other.
主轴40通过2个轴承401、402以可绕驱动轴线DX旋转的方式被支承。前侧的轴承401被嵌入支承在第1壳体部11的前端部(圆筒部111)内，将主轴40的前端部(工具保持架41)可旋转地进行支承。后侧的轴承402由支承体22来支承，且将主轴40(气缸42)的后端部可旋转地进行支承。The spindle 40 is supported rotatably around the drive axis DX by two bearings 401 and 402. The front bearing 401 is embedded and supported in the front end portion (cylindrical portion 111) of the first housing portion 11, and rotatably supports the front end portion (tool holder 41) of the spindle 40. The rear bearing 402 is supported by the support body 22, and rotatably supports the rear end portion of the spindle 40 (cylinder 42).
如图5所示，支承体22是整体呈环状(圈状)的部件。支承体22通过金属来形成。如图3所示，轴承402嵌入支承体22的内侧。支承体22连接于内壳体20的上半部的前端部，嵌入第1壳体部11的上部内。根据这种结构，主轴40的后端部通过轴承402和支承体22被支承于第1壳体部11。As shown in FIG5 , the support body 22 is a member that is annular (ring-shaped) as a whole. The support body 22 is formed of metal. As shown in FIG3 , the bearing 402 is embedded in the inner side of the support body 22. The support body 22 is connected to the front end of the upper half of the inner housing 20 and is embedded in the upper part of the first housing part 11. According to this structure, the rear end of the main shaft 40 is supported by the first housing part 11 through the bearing 402 and the support body 22.
下面，对驱动机构4进行说明。Next, the driving mechanism 4 will be described.
如图3所示，驱动机构4构成为，以可进行动作的方式连接于电机31(电机轴315)，通过电机31的动力来驱动。本实施方式的驱动机构4包括冲击动作用的冲击机构5、和旋转动作用的旋转传递机构6。冲击机构5包括运动转换机构51和冲击结构要素58。As shown in FIG3 , the drive mechanism 4 is connected to the motor 31 (motor shaft 315) in an operable manner and is driven by the power of the motor 31. The drive mechanism 4 of this embodiment includes an impact mechanism 5 for impact action and a rotation transmission mechanism 6 for rotation action. The impact mechanism 5 includes a motion conversion mechanism 51 and an impact structural element 58.
如图3、图6所示，运动转换机构51以可进行动作的方式连接于电机轴315。运动转换机构51构成为，将电机轴315的旋转运动转换为用于驱动顶端工具91的沿着驱动轴线DX的直线运动(详细而言，活塞57的直线运动)。在本实施方式中，作为运动转换机构51，采用摆动式的运动转换机构。运动转换机构51包括被设置在中间轴52上的旋转体54及摆动部件55、和被配置在主轴40(气缸42)内的活塞57。As shown in Fig. 3 and Fig. 6, the motion conversion mechanism 51 is connected to the motor shaft 315 in an operable manner. The motion conversion mechanism 51 is configured to convert the rotational motion of the motor shaft 315 into a linear motion (specifically, the linear motion of the piston 57) along the drive axis DX for driving the top tool 91. In the present embodiment, a swing type motion conversion mechanism is adopted as the motion conversion mechanism 51. The motion conversion mechanism 51 includes a rotating body 54 and a swinging member 55 provided on the intermediate shaft 52, and a piston 57 disposed in the main shaft 40 (cylinder 42).
中间轴52在第1空间101的下半部，以可绕与驱动轴线DX平行(即，沿前后方向延伸)的旋转轴线RX旋转的方式被支承。在中间轴52的后端部连接有第2锥齿轮53。第2锥齿轮53与中间轴52一体地旋转。The intermediate shaft 52 is supported in the lower half of the first space 101 so as to be rotatable about a rotation axis RX parallel to the drive axis DX (i.e., extending in the front-rear direction). A second bevel gear 53 is connected to the rear end of the intermediate shaft 52. The second bevel gear 53 rotates integrally with the intermediate shaft 52.
第2锥齿轮53包括圆筒状的安装部533、和形成有齿轮齿531的齿部。安装部533被固定在中间轴52的后端部的周围。第2锥齿轮53的后端(齿部的后端)位于比中间轴52的后端靠后方的位置。即，第2锥齿轮53的一部分比中间轴52的后端向后方突出。第2锥齿轮53与设置于电机轴315的第1锥齿轮33啮合，响应于电机轴315的旋转而与中间轴52一体地旋转。另外，第1锥齿轮33和第2锥齿轮53构成为齿轮减速机，第2锥齿轮53的齿轮齿531的直径比第1锥齿轮33的齿轮齿331大。The second bevel gear 53 includes a cylindrical mounting portion 533 and a tooth portion formed with gear teeth 531. The mounting portion 533 is fixed around the rear end portion of the intermediate shaft 52. The rear end of the second bevel gear 53 (the rear end of the tooth portion) is located further back than the rear end of the intermediate shaft 52. That is, a portion of the second bevel gear 53 protrudes further back than the rear end of the intermediate shaft 52. The second bevel gear 53 meshes with the first bevel gear 33 provided on the motor shaft 315, and rotates integrally with the intermediate shaft 52 in response to the rotation of the motor shaft 315. In addition, the first bevel gear 33 and the second bevel gear 53 constitute a gear reducer, and the diameter of the gear teeth 531 of the second bevel gear 53 is larger than the gear teeth 331 of the first bevel gear 33.
中间轴52通过2个轴承521、522以可旋转的方式被支承。前侧的轴承521嵌入中间轴52的前端部的外周，被支承在主体壳体10(第1壳体部11)的前端部。后侧的轴承522嵌入第2锥齿轮53的安装部533的外周，通过固定于内壳体20的轴承支承部件23被支承。即，在本实施方式中，中间轴52的后端部通过第2锥齿轮53以可旋转的方式被支承。根据这种结构，与中间轴52的一部分直接被轴承支承的结构相比较，能够缩短中间轴52。The intermediate shaft 52 is rotatably supported by two bearings 521 and 522. The front bearing 521 is embedded in the outer periphery of the front end of the intermediate shaft 52 and is supported by the front end of the main housing 10 (first housing portion 11). The rear bearing 522 is embedded in the outer periphery of the mounting portion 533 of the second bevel gear 53 and is supported by the bearing support member 23 fixed to the inner housing 20. That is, in the present embodiment, the rear end of the intermediate shaft 52 is rotatably supported by the second bevel gear 53. According to this structure, the intermediate shaft 52 can be shortened compared to a structure in which a part of the intermediate shaft 52 is directly supported by a bearing.
轴承支承部件23是独立于内壳体20的部件，被配置在内壳体20的内部，利用螺钉被固定于内壳体20。轴承支承部件23以覆盖第2锥齿轮53的齿部的外周部和前端部的方式形成。第2锥齿轮53被收容于内壳体20的后壁部203与轴承支承部件23之间的空间。在轴承支承部件23中的、第2锥齿轮53的齿轮齿531的径向外侧设置有开口230。开口230使收容有第2锥齿轮53的轴承支承部件23的内部空间和轴承支承部件23的外部的空间相连通。The bearing support member 23 is a member independent of the inner housing 20, is arranged inside the inner housing 20, and is fixed to the inner housing 20 by screws. The bearing support member 23 is formed in a manner covering the outer periphery and the front end of the tooth portion of the second bevel gear 53. The second bevel gear 53 is accommodated in the space between the rear wall portion 203 of the inner housing 20 and the bearing support member 23. An opening 230 is provided in the radially outer side of the gear teeth 531 of the second bevel gear 53 in the bearing support member 23. The opening 230 connects the internal space of the bearing support member 23 in which the second bevel gear 53 is accommodated and the space outside the bearing support member 23.
旋转体54被设置在中间轴52上(中间轴52的周围)，能够与中间轴52一体地旋转。另外，由于是周知的结构，因此省略详细的说明，但旋转体54按照所选择的动作模式，通过模式切换机构在与中间轴52一体地旋转的状态、与相对于中间轴52空转的状态之间进行切换。旋转体54仅在选择进行冲击动作的动作模式的情况下与中间轴52一体地旋转。摆动部件55构成为，以可进行动作的方式连接于旋转体54，响应于旋转体54的旋转而进行摆动。另外，旋转体54和摆动部件55是还被称为斜盘轴承(swash bearing)、摆动轴承(wobblebearing)等的周知的部件。The rotating body 54 is provided on the intermediate shaft 52 (around the intermediate shaft 52) and is rotatable integrally with the intermediate shaft 52. In addition, since it is a well-known structure, a detailed description is omitted, but the rotating body 54 is switched between a state of rotating integrally with the intermediate shaft 52 and a state of idling relative to the intermediate shaft 52 by a mode switching mechanism according to the selected action mode. The rotating body 54 rotates integrally with the intermediate shaft 52 only when the action mode for performing the impact action is selected. The swing member 55 is connected to the rotating body 54 in an operable manner and swings in response to the rotation of the rotating body 54. In addition, the rotating body 54 and the swing member 55 are well-known components also called swash bearings, wobble bearings, etc.
本实施方式的摆动部件55包括：通过转动体连接于旋转体54的周围的圆环状的环形部550；和从环形部550分别向径向外侧突出的摆动臂551及突起552。摆动臂551在上下方向上从环形部550向上方突出，且响应于旋转体54的旋转在前后方向上摆动。摆动臂551以可进行动作的方式连接于活塞57。突起552被配置在与摆动臂551的长轴相同的轴线上(一直线上)配置，从环形部550向与摆动臂551相反的方向突出。因此，突起552响应于旋转体54的旋转，在前后方向上向与摆动臂551相反的方向摆动。突起552连接于平衡锤7。在后面详细叙述平衡锤7及其支承结构。The swing member 55 of this embodiment includes: a ring-shaped annular portion 550 connected to the periphery of the rotating body 54 through a rotating body; and a swing arm 551 and a protrusion 552 protruding radially outward from the annular portion 550. The swing arm 551 protrudes upward from the annular portion 550 in the up-down direction, and swings in the front-to-back direction in response to the rotation of the rotating body 54. The swing arm 551 is connected to the piston 57 in an operable manner. The protrusion 552 is arranged on the same axis (on a straight line) as the long axis of the swing arm 551, and protrudes from the annular portion 550 in the opposite direction to the swing arm 551. Therefore, the protrusion 552 swings in the front-to-back direction in the opposite direction to the swing arm 551 in response to the rotation of the rotating body 54. The protrusion 552 is connected to the counterweight 7. The counterweight 7 and its supporting structure will be described in detail later.
活塞57是有底圆筒状的部件，在气缸42(主轴40的后半部分)内以可沿驱动轴线DX滑动的方式来配置。活塞57的后端部571通过连接销573以可进行动作的方式连接于摆动部件55的摆动臂551。活塞57响应于摆动部件55的摆动臂551的摆动而沿前后方向往复运动。The piston 57 is a bottomed cylindrical member, and is arranged in the cylinder 42 (the rear half of the main shaft 40) so as to be slidable along the drive axis DX. The rear end 571 of the piston 57 is movably connected to the swing arm 551 of the swing member 55 through a connecting pin 573. The piston 57 reciprocates in the front-rear direction in response to the swing of the swing arm 551 of the swing member 55.
另外，本实施方式的内壳体20构成为，收容冲击机构5中的运动转换机构51的一部分。更详细而言，内壳体20构成为，被设置于中间轴52的旋转体54和摆动部件55的大部分被收容于内壳体20的内部空间200。换言之，旋转体54和摆动部件55的大部分被内壳体20的周壁部202和后壁部203包围。In addition, the inner housing 20 of the present embodiment is configured to accommodate a portion of the motion conversion mechanism 51 in the impact mechanism 5. More specifically, the inner housing 20 is configured such that most of the rotating body 54 and the swing member 55 provided on the intermediate shaft 52 are accommodated in the internal space 200 of the inner housing 20. In other words, most of the rotating body 54 and the swing member 55 are surrounded by the peripheral wall portion 202 and the rear wall portion 203 of the inner housing 20.
如图3所示，冲击结构要素58构成为，响应于活塞57的往复运动呈直线状移动来对顶端工具91给予冲击力，据此沿驱动轴线DX呈直线状驱动顶端工具91。在本实施方式中，冲击结构要素58包括撞锤581和撞栓583。撞锤581在有底圆筒状的活塞57内，以能够沿驱动轴线DX滑动的方式来配置。撞锤581的后侧的活塞57的内部空间(撞锤581与活塞的底部之间的空间)被规定为作为空气弹簧来发挥作用的空气室59。撞栓583在撞锤581的前侧被配置在工具保持架41内，能够沿驱动轴线DX滑动。另外，撞锤581的前方的空间通过形成于工具保持架41的通孔与第1空间101连通。As shown in FIG3 , the impact structural element 58 is configured to apply an impact force to the top tool 91 by linearly moving in response to the reciprocating motion of the piston 57, thereby driving the top tool 91 linearly along the drive axis DX. In the present embodiment, the impact structural element 58 includes a hammer 581 and a striker 583. The hammer 581 is arranged in a bottomed cylindrical piston 57 in a manner that can slide along the drive axis DX. The internal space of the piston 57 on the rear side of the hammer 581 (the space between the hammer 581 and the bottom of the piston) is defined as an air chamber 59 that acts as an air spring. The striker 583 is arranged in the tool holder 41 on the front side of the hammer 581 and can slide along the drive axis DX. In addition, the space in front of the hammer 581 is connected to the first space 101 through a through hole formed in the tool holder 41.
伴随着活塞57在气缸42内往复滑动，空气室59内部的空气的压力发生变动，通过空气弹簧的作用使撞锤581在活塞57内沿前后方向滑动。更详细而言，当活塞57向前方移动时，撞锤581通过空气弹簧的作用被高速向前方推出来冲击撞栓583。撞栓583将撞锤581的运动能量传递给顶端工具91。据此，顶端工具91被沿驱动轴线DX呈直线状驱动。另一方面，当活塞57向后方移动时，撞锤581被向后方拉回。顶端工具91通过被向加工件按压来与撞栓583一起向后方移动。这样一来，通过冲击机构5来重复冲击动作。As the piston 57 slides back and forth in the cylinder 42, the pressure of the air inside the air chamber 59 changes, and the hammer 581 slides in the front-to-back direction in the piston 57 through the action of the air spring. In more detail, when the piston 57 moves forward, the hammer 581 is pushed forward at high speed by the action of the air spring to impact the striker 583. The striker 583 transmits the kinetic energy of the hammer 581 to the top tool 91. Accordingly, the top tool 91 is driven linearly along the drive axis DX. On the other hand, when the piston 57 moves backward, the hammer 581 is pulled back backward. The top tool 91 moves backward together with the striker 583 by being pressed against the workpiece. In this way, the impact action is repeated by the impact mechanism 5.
如图3所示，旋转传递机构6构成为，以可进行动作的方式连接于电机轴315，将电机轴315的旋转传递给工具保持架41(主轴40)。旋转传递机构6包括：驱动齿轮61，其被设置在中间轴52的前端部；和从动齿轮63，其被设置在主轴40的气缸42的外周，与驱动齿轮61啮合。驱动齿轮61和从动齿轮63构成齿轮减速机。另外，驱动齿轮61通过上述的模式切换机构，在与中间轴52一体地旋转的状态、与相对于中间轴52空转的状态之间进行切换。驱动齿轮61仅在选择了进行旋转动作的动作模式的情况下与中间轴52一体地旋转。As shown in FIG3 , the rotation transmission mechanism 6 is configured to be connected to the motor shaft 315 in an operable manner, and to transmit the rotation of the motor shaft 315 to the tool holder 41 (spindle 40). The rotation transmission mechanism 6 includes: a drive gear 61, which is provided at the front end of the intermediate shaft 52; and a driven gear 63, which is provided at the outer periphery of the cylinder 42 of the spindle 40 and meshes with the drive gear 61. The drive gear 61 and the driven gear 63 constitute a gear reducer. In addition, the drive gear 61 is switched between a state of rotating integrally with the intermediate shaft 52 and a state of idling relative to the intermediate shaft 52 by the above-mentioned mode switching mechanism. The drive gear 61 rotates integrally with the intermediate shaft 52 only when the action mode for performing a rotational action is selected.
驱动齿轮61响应于电机轴315的旋转而与中间轴52一体地旋转，据此主轴40与从动齿轮63一体地旋转，被保持于工具保持架41的顶端工具91被绕驱动轴线DX旋转驱动。这样一来，由旋转传递机构6进行旋转动作。The driving gear 61 rotates integrally with the intermediate shaft 52 in response to the rotation of the motor shaft 315, thereby integrally rotating the main shaft 40 and the driven gear 63, and the tip tool 91 held by the tool holder 41 is driven to rotate about the drive axis DX. In this way, the rotation transmission mechanism 6 performs a rotation operation.
下面，说明平衡锤7及其支承结构。Next, the counterweight 7 and its supporting structure will be described.
如图6、图7所示，平衡锤7在被第1壳体部11和内壳体20围成的第1空间101内，通过支承体22以可摆动的方式被支承。如上所述，支承体22是独立于内壳体20的部件，连接于内壳体20的上半部的前端部。As shown in Fig. 6 and Fig. 7, the counterweight 7 is supported in a swingable manner by the support body 22 in the first space 101 surrounded by the first housing portion 11 and the inner housing 20. As described above, the support body 22 is a component independent of the inner housing 20 and is connected to the front end of the upper half of the inner housing 20.
更详细而言，如图8、图9所示，本实施方式的平衡锤7构成为在上下方向上长的环状(圈状)的部件。平衡锤7由金属制成。支承体22包括环状的主体部221、和从主体部221的上部向后方突出的2个臂部223。More specifically, as shown in Fig. 8 and Fig. 9, the counterweight 7 of this embodiment is formed as an annular (ring-shaped) member that is long in the vertical direction. The counterweight 7 is made of metal. The support body 22 includes an annular main body 221 and two arm parts 223 that protrude rearward from the upper part of the main body 221.
如上所述，主体部221是通过轴承402(参照图6)来支承主轴40(气缸42)的后端部的环状的部分。主体部221在设置于主体部221的后端的抵接面抵接于设置在内壳体20的前端部的抵接面的状态下，利用螺钉被固定于内壳体20的前端部。主体部221在上下方向上位于比配置在中间轴52上的旋转体54靠上方的位置。As described above, the main body 221 is an annular portion that supports the rear end of the main shaft 40 (cylinder 42) through the bearing 402 (see FIG. 6 ). The main body 221 is fixed to the front end of the inner housing 20 by screws in a state where the abutting surface provided at the rear end of the main body 221 abuts against the abutting surface provided at the front end of the inner housing 20. The main body 221 is located above the rotating body 54 arranged on the intermediate shaft 52 in the up-down direction.
2个臂部223从主体部221中的位于比活塞57的后端部571(与摆动臂551连接的部分)靠上方的部分向内壳体20的内部空间200延伸。臂部223在左右方向上分离设置于在上下方向上实质上相同的位置，实质上相互平行地沿前后方向延伸。各臂部223的后端位于旋转体54和摆动部件55的环形部550的正上方。The two arm portions 223 extend from a portion of the main body 221 located above the rear end portion 571 of the piston 57 (the portion connected to the swing arm 551) toward the internal space 200 of the inner housing 20. The arm portions 223 are separated in the left-right direction and are disposed at substantially the same position in the up-down direction, and extend substantially parallel to each other in the front-back direction. The rear end of each arm portion 223 is located directly above the annular portion 550 of the rotating body 54 and the swing member 55.
如图6、图7所示，在平衡锤7的上端部，设置有沿左右方向延伸的支承孔71。在该支承孔71中贯插有支承轴225。2个臂部223的后端部支承着支承轴225的两端部。更详细而言，在臂部223的后端部，形成有沿左右方向贯通臂部223的支承孔224。支承轴225的两端部被贯插并支承于2个臂部223的支承孔224。根据这种结构，平衡锤7通过支承轴225由支承体22以可摆动的方式进行支承。平衡锤7的摆动轴线PX在比活塞57的后端部571靠上方的位置沿左右方向延伸。As shown in Fig. 6 and Fig. 7, a support hole 71 extending in the left-right direction is provided at the upper end of the counterweight 7. A support shaft 225 is inserted into the support hole 71. The rear ends of the two arms 223 support the two ends of the support shaft 225. In more detail, a support hole 224 penetrating the arm 223 in the left-right direction is formed at the rear end of the arm 223. The two ends of the support shaft 225 are inserted and supported by the support holes 224 of the two arms 223. According to this structure, the counterweight 7 is supported by the support body 22 in a swingable manner through the support shaft 225. The swing axis PX of the counterweight 7 extends in the left-right direction at a position above the rear end 571 of the piston 57.
在上下方向上，平衡锤7的环形的内侧区域的上半部位于与活塞57的后端部571对应的位置，下半部位于与摆动部件55的环形部550对应的位置。平衡锤7的形状被设定为，当进行冲击动作时，活塞57的后端部571和摆动部件55的环形部550能不与平衡锤7相干涉而在内侧区域内移动。In the up-down direction, the upper half of the annular inner region of the counterweight 7 is located at a position corresponding to the rear end portion 571 of the piston 57, and the lower half is located at a position corresponding to the annular portion 550 of the swing member 55. The shape of the counterweight 7 is set so that when the impact action is performed, the rear end portion 571 of the piston 57 and the annular portion 550 of the swing member 55 can move within the inner region without interfering with the counterweight 7.
另外，如图6、图9所示，平衡锤7以可进行动作的方式与摆动部件55相连接。更详细而言，在平衡锤7的下端部设置有卡合孔73。摆动部件55的突起552以存在游隙的状态被插入卡合孔73。因此，当摆动部件55响应于中间轴52的旋转而摆动时，平衡锤7被突起552驱动，绕摆动轴线PX摆动。如上所述，突起552在与摆动臂551相同的轴线上向相反的方向突出，因此，平衡锤7的下端部向与活塞57及冲击结构要素58相反的方向移动。据此，平衡锤7能够减少冲击动作时产生的前后方向上的周期性的振动。In addition, as shown in FIG. 6 and FIG. 9 , the balancing weight 7 is connected to the swing member 55 in an operable manner. More specifically, an engaging hole 73 is provided at the lower end of the balancing weight 7. The protrusion 552 of the swing member 55 is inserted into the engaging hole 73 with play. Therefore, when the swing member 55 swings in response to the rotation of the intermediate shaft 52, the balancing weight 7 is driven by the protrusion 552 to swing around the swing axis PX. As described above, the protrusion 552 protrudes in the opposite direction on the same axis as the swing arm 551, so that the lower end of the balancing weight 7 moves in the opposite direction to the piston 57 and the impact structural element 58. Accordingly, the balancing weight 7 can reduce the periodic vibration in the front-rear direction generated during the impact action.
如以上说明的那样，在本实施方式中，并不是通过内壳体20来支承平衡锤7，而是通过独立于内壳体20的部件即支承体22来支承平衡锤7。因此，不受与平衡锤7的支承结构有关的制限，而能够实现内壳体20的最优的设计。例如，与通过内壳体来支承平衡锤的公知的结构相比，能够简化内壳体的形状。另外，由于易于在支承体22设置臂部223，因此在支承结构的加工成本方面也是最有利的。另外，在本实施方式中，支承体22兼作支承主轴40的后端部的部件，因此，无需增加零部件数而实现平衡锤7与主轴40的合理的支承结构。As described above, in the present embodiment, the counterweight 7 is supported not by the inner housing 20 but by the supporting body 22 which is a component independent of the inner housing 20. Therefore, the optimal design of the inner housing 20 can be achieved without being restricted by the supporting structure of the counterweight 7. For example, the shape of the inner housing can be simplified compared with the known structure in which the counterweight is supported by the inner housing. In addition, since it is easy to set the arm 223 on the supporting body 22, it is also most advantageous in terms of the processing cost of the supporting structure. In addition, in the present embodiment, the supporting body 22 also serves as a component supporting the rear end of the main shaft 40, so it is possible to achieve a reasonable supporting structure of the counterweight 7 and the main shaft 40 without increasing the number of components.
另外，在上述的公知的结构中，通过支承轴来支承平衡锤的部分(支承部)比内壳体的周壁部向前方突出，以使得在组装时支承轴穿过支承部的支承孔。该支承部及平衡锤与驱动机构及润滑剂一起，被配置在由安装于周壁部的外周的密封部件密封而成的空间内。另一方面，由于平衡锤需要通过摆动部件来驱动，因此，将支承轴配置于向前方远离摆动部件的位置存在限制。因此，在上述的公知的结构中，使内壳体的周壁部向前方延伸，使密封部件的位置向前方移动存在限制。In addition, in the above-mentioned known structure, the portion (supporting portion) that supports the counterweight by the supporting shaft protrudes forward from the peripheral wall portion of the inner housing so that the supporting shaft passes through the supporting hole of the supporting portion during assembly. The supporting portion and the counterweight, together with the driving mechanism and the lubricant, are arranged in a space sealed by a sealing member installed on the outer periphery of the peripheral wall portion. On the other hand, since the counterweight needs to be driven by the swinging member, there is a limitation on arranging the supporting shaft at a position away from the swinging member forward. Therefore, in the above-mentioned known structure, the peripheral wall portion of the inner housing is extended forward, and there is a limitation on moving the position of the sealing member forward.
与此相对，在本实施方式中，支承体22在内壳体20的内部空间200内支承着支承轴225。因此，不存在这种限制，使内壳体20比公知的结构向前方延伸，能够将密封部件28配置在内壳体20的前端部。因此，能够通过沿着上述的流路在第2空间102内流动的空气，有效地对内壳体20的更大的区域进行冷却。In contrast, in the present embodiment, the support body 22 supports the support shaft 225 in the internal space 200 of the inner housing 20. Therefore, there is no such limitation, and the inner housing 20 is extended forward compared with the known structure, and the sealing member 28 can be arranged at the front end of the inner housing 20. Therefore, a larger area of the inner housing 20 can be effectively cooled by the air flowing in the second space 102 along the above-mentioned flow path.
下面，说明用于调整第1空间101的压力的结构。Next, a structure for adjusting the pressure of the first space 101 will be described.
如上所述，在由内壳体20和第1壳体部11规定的第1空间101内收容有润滑剂。因此，第1空间101为密闭的空间，以使润滑剂不会漏出。另一方面，当第1空间101为气密的空间时，可能发生冲击结构要素58不正常地进行动作的不良情况。具体而言，当冲击机构5伴随着驱动而发热时，第1空间101内的温度及压力上升，比主轴40内的撞锤581靠前方的空间的压力也上升。其结果，该空间与作为空气弹簧来发挥作用的空气室59的压力平衡被破坏，存在撞锤581不正常地进行直线动作的可能性。As described above, lubricant is contained in the first space 101 defined by the inner housing 20 and the first housing portion 11. Therefore, the first space 101 is a closed space so that the lubricant does not leak out. On the other hand, when the first space 101 is an airtight space, there may be a problem in which the impact structural element 58 does not move normally. Specifically, when the impact mechanism 5 generates heat as the impact mechanism 5 is driven, the temperature and pressure in the first space 101 rise, and the pressure in the space in front of the hammer 581 in the main shaft 40 also rises. As a result, the pressure balance between the space and the air chamber 59 that acts as an air spring is destroyed, and there is a possibility that the hammer 581 does not move normally in a straight line.
因此，在本实施方式的锤钻1中，设置有用于使第1空间101的空气向外部(即，向第2空间102)流出来调节第1空间101的压力的结构。具体而言，如图10所示，在内壳体20设置有用于使第1空间101的内部和外部相连通的排气孔24。另一方面，润滑剂通过排气孔24从第1空间101向外部漏出是不优选的。因此，在本实施方式中，排气孔24及其周边部构成为抑制润滑剂的漏出。Therefore, in the hammer drill 1 of the present embodiment, a structure is provided for allowing the air in the first space 101 to flow out to the outside (i.e., to the second space 102) to adjust the pressure of the first space 101. Specifically, as shown in FIG. 10 , an exhaust hole 24 is provided in the inner housing 20 for communicating the inside and the outside of the first space 101. On the other hand, it is not preferable that the lubricant leaks out from the first space 101 through the exhaust hole 24. Therefore, in the present embodiment, the exhaust hole 24 and its surrounding portion are configured to suppress the leakage of the lubricant.
排气孔24被设置于内壳体20的后壁部203中的与被设置于中间轴52的第2锥齿轮53的中心部对应的位置。更详细而言，内壳体20的后壁部203中的与比第2锥齿轮53的齿轮齿531的内周(径向内侧的端部)靠径向内侧的区域对应的部分具有向前方突出的突出部205。排气孔24是沿着第2锥齿轮53的旋转轴线RX，沿前后方向呈直线状贯通突出部205的孔。排气孔24具有面向内壳体20的内部的开口即入口241、和面向内壳体20的外部的开口即出口242。The exhaust hole 24 is provided at a position corresponding to the center of the second bevel gear 53 provided on the intermediate shaft 52 in the rear wall portion 203 of the inner housing 20. More specifically, a portion of the rear wall portion 203 of the inner housing 20 corresponding to a region radially inward of the inner periphery (radially inner end) of the gear teeth 531 of the second bevel gear 53 has a protrusion 205 protruding forward. The exhaust hole 24 is a hole that linearly penetrates the protrusion 205 in the front-to-rear direction along the rotation axis RX of the second bevel gear 53. The exhaust hole 24 has an inlet 241 that is an opening facing the inside of the inner housing 20, and an outlet 242 that is an opening facing the outside of the inner housing 20.
另一方面，在第2锥齿轮53和中间轴52，设置有承接内壳体20的突出部205的凹部(有底孔)25。如上所述，第2锥齿轮53在其后端部比中间轴52的后端向后方突出的状态下被固定于中间轴52的外周。凹部25在第2锥齿轮53的后端面具有开口251，贯通第2锥齿轮53的齿部的中心部，在中间轴52的中心部向前方延伸。凹部25的直径比突出部205的直径大。突出部205在突出部205的外表面与规定凹部25的面之间存在间隙的状态下，被从开口251插入凹部25内。突出部205的顶端(排气孔24的入口241)从凹部25的底面向后方远离。排气孔24与凹部25的内部空间连通。On the other hand, the second bevel gear 53 and the intermediate shaft 52 are provided with a recess (bottomed hole) 25 for receiving the protrusion 205 of the inner housing 20. As described above, the second bevel gear 53 is fixed to the outer periphery of the intermediate shaft 52 in a state where the rear end portion thereof protrudes rearward from the rear end of the intermediate shaft 52. The recess 25 has an opening 251 at the rear end surface of the second bevel gear 53, passes through the center portion of the tooth portion of the second bevel gear 53, and extends forward at the center portion of the intermediate shaft 52. The diameter of the recess 25 is larger than the diameter of the protrusion 205. The protrusion 205 is inserted into the recess 25 from the opening 251 in a state where there is a gap between the outer surface of the protrusion 205 and the surface defining the recess 25. The top end of the protrusion 205 (the inlet 241 of the exhaust hole 24) is away from the bottom surface of the recess 25 to the rear. The exhaust hole 24 is connected to the internal space of the recess 25.
根据这种结构，规定出从开口251通过凹部25的内部，经由排气孔24到达内壳体20的外部的空气的流路。即，该流路构成为在中途折回(流动的方向反转)。According to this structure, a flow path of air is defined which passes from the opening 251 through the inside of the recess 25 and reaches the outside of the inner case 20 via the exhaust hole 24. That is, the flow path is configured to bend back (the direction of the flow is reversed) in the middle.
另外，本实施方式的凹部25通过通孔和凹部(有底孔)形成，其中，所述通孔形成于第2锥齿轮53的齿部的中心部；所述凹部与该通孔连通，从中间轴52的后端面向前方凹进。第2锥齿轮53的通孔的直径比中间轴52的凹部的直径大，因此，组装时易于将突出部205插入凹部25。In addition, the recess 25 of the present embodiment is formed by a through hole and a recess (bottomed hole), wherein the through hole is formed in the center of the tooth portion of the second bevel gear 53; the recess communicates with the through hole and is recessed forward from the rear end surface of the intermediate shaft 52. The diameter of the through hole of the second bevel gear 53 is larger than the diameter of the recess of the intermediate shaft 52, so it is easy to insert the protrusion 205 into the recess 25 during assembly.
如图4、图10所示，在内壳体20的后壁部203的外表面，以围绕排气孔24的方式设置有筒状部207。过滤器208嵌入筒状部207。过滤器208采用能一边使空气通过一边吸收、保持润滑剂的部件(例如，毡片、海绵)。As shown in Fig. 4 and Fig. 10, a cylindrical portion 207 is provided on the outer surface of the rear wall portion 203 of the inner housing 20 so as to surround the exhaust hole 24. A filter 208 is embedded in the cylindrical portion 207. The filter 208 is a member (e.g., felt sheet, sponge) that can absorb and retain lubricant while allowing air to pass through.
并且，内壳体20的后壁部203中的与第2锥齿轮53的齿轮齿531相向的部分具有沿着齿部的形状。内壳体20中的与齿轮齿531相向的部分的内表面与齿轮齿531的顶端之间的距离被设定为，比齿轮齿531的齿高(齿轮齿531的外周端上的齿尖到齿底的距离)小。因此，齿轮齿531的顶端与内壳体20之间的距离非常小。据此，进入该间隙的润滑剂本身的量也能够变少。另外，在第2锥齿轮53的径向上，该距离实质上是一定的。Furthermore, the portion of the rear wall portion 203 of the inner housing 20 that faces the gear teeth 531 of the second bevel gear 53 has a shape along the tooth portion. The distance between the inner surface of the portion of the inner housing 20 that faces the gear teeth 531 and the top of the gear teeth 531 is set to be smaller than the tooth height of the gear teeth 531 (the distance from the tooth tip to the tooth bottom on the outer peripheral end of the gear teeth 531). Therefore, the distance between the top of the gear teeth 531 and the inner housing 20 is very small. Accordingly, the amount of lubricant itself that enters the gap can also be reduced. In addition, in the radial direction of the second bevel gear 53, the distance is substantially constant.
同样，内壳体20中的与第1锥齿轮33的齿轮齿331相向的部分的内表面与齿轮齿331的顶端之间的距离被设定为比齿轮齿331的齿高(从齿尖到齿底的距离)小。因此，齿轮齿331的顶端与内壳体20之间的距离非常小。另外，在第1锥齿轮33的径向上，该距离实质上为一定的。Similarly, the distance between the inner surface of the portion of the inner housing 20 facing the gear teeth 331 of the first bevel gear 33 and the top of the gear teeth 331 is set to be smaller than the tooth height (the distance from the tooth tip to the tooth bottom) of the gear teeth 331. Therefore, the distance between the top of the gear teeth 331 and the inner housing 20 is very small. In addition, in the radial direction of the first bevel gear 33, this distance is substantially constant.
另外，在本实施方式中，支承中间轴52的后端部的轴承522并不是在后壁部203，而是在内壳体20的内部通过轴承支承部件23来支承。因此，能够使内壳体20的后壁部203如上述那样为对形成润滑剂不易通过的空气的流路有效的形状。In addition, in the present embodiment, the bearing 522 supporting the rear end portion of the intermediate shaft 52 is supported by the bearing support member 23 inside the inner housing 20, not on the rear wall portion 203. Therefore, the rear wall portion 203 of the inner housing 20 can be made into a shape effective for forming a flow path for air through which the lubricant is difficult to pass, as described above.
当响应于冲击机构5的驱动而冲击机构5发热，第1空间101内的空气膨胀而内部压力上升时，第1空间101内的空气通过排气孔24，向压力更低的第2空间102流出。具体而言，空气从轴承支承部件23的外部，主要通过开口230进入轴承支承部件23的内部(轴承522与后壁部203之间的空间)。该空气通过第2锥齿轮53与内壳体20的内表面之间的间隙、及第1锥齿轮33与内壳体20的内表面之间的间隙而到达凹部25的开口251。从开口251进入凹部25内的空气向前方通过突出部205的外表面与规定凹部25的面之间的间隙，从入口241进入排气孔24，且通过出口242和过滤器208向第2空间102流出。When the impact mechanism 5 generates heat in response to the driving of the impact mechanism 5, the air in the first space 101 expands and the internal pressure rises, the air in the first space 101 flows out to the second space 102 with a lower pressure through the exhaust hole 24. Specifically, the air enters the inside of the bearing support member 23 (the space between the bearing 522 and the rear wall portion 203) from the outside of the bearing support member 23, mainly through the opening 230. The air passes through the gap between the second bevel gear 53 and the inner surface of the inner housing 20 and the gap between the first bevel gear 33 and the inner surface of the inner housing 20 to reach the opening 251 of the recess 25. The air entering the recess 25 from the opening 251 passes forward through the gap between the outer surface of the protrusion 205 and the surface defining the recess 25, enters the exhaust hole 24 from the inlet 241, and flows out to the second space 102 through the outlet 242 and the filter 208.
另一方面，有效地抑制润滑剂从第1空间101内向第2空间102漏出。具体而言，当驱动冲击机构5时，第2锥齿轮53进行旋转，因此，位于第2锥齿轮53的齿轮齿531与内壳体20的内表面之间的间隙内的润滑剂通过离心力而被向径向外侧送出。另外，由于轴承支承部件23具有开口230，因此，润滑剂能够通过开口230向轴承支承部件23的外部流出。这样，在本实施方式中，能够有效使用作为驱动机构4的一部分的第2锥齿轮53，减少润滑剂到达设置在第2锥齿轮53的中心部且通过排气孔24的凹部25的开口251的可能性。尤其是，由于第2锥齿轮53的直径比第1锥齿轮33大，因此，能够确保从齿轮齿531的外周端(径向外侧端)到中心部的流路更长。另外，更易于形成能够承接突出部205的凹部25。在该方面，有效使用第2锥齿轮53存在优点。On the other hand, the lubricant is effectively suppressed from leaking from the first space 101 to the second space 102. Specifically, when the impact mechanism 5 is driven, the second bevel gear 53 rotates, and therefore, the lubricant in the gap between the gear teeth 531 of the second bevel gear 53 and the inner surface of the inner housing 20 is sent radially outward by centrifugal force. In addition, since the bearing support member 23 has the opening 230, the lubricant can flow out to the outside of the bearing support member 23 through the opening 230. In this way, in this embodiment, the second bevel gear 53 as a part of the drive mechanism 4 can be effectively used, and the possibility of the lubricant reaching the opening 251 of the recessed portion 25 provided in the center of the second bevel gear 53 and passing through the exhaust hole 24 is reduced. In particular, since the diameter of the second bevel gear 53 is larger than that of the first bevel gear 33, it is possible to ensure a longer flow path from the outer peripheral end (radially outer end) of the gear teeth 531 to the center. In addition, it is easier to form the recessed portion 25 that can receive the protrusion 205. In this respect, there is an advantage in effectively using the second bevel gear 53.
并且，如上所述，从凹部25的开口251到达排气孔24的出口242的流路构成为，在向前方延伸之后向后方折回。据此，能够进一步降低润滑剂漏出的可能性。另外，在润滑剂从排气孔24的出口242漏出的情况下，嵌入筒状部207的过滤器208吸收并保持润滑剂，能够抑制润滑剂在第2空间102内扩散。Furthermore, as described above, the flow path from the opening 251 of the recessed portion 25 to the outlet 242 of the exhaust hole 24 is configured to bend back toward the rear after extending forward. Thus, the possibility of lubricant leakage can be further reduced. In addition, in the case where the lubricant leaks from the outlet 242 of the exhaust hole 24, the filter 208 embedded in the cylindrical portion 207 absorbs and retains the lubricant, which can suppress the lubricant from diffusing in the second space 102.
另外，上述实施方式仅仅是示例，本发明所涉及的往复运动工具并不限定于示例的锤钻1。例如，能够增加以下示例的非限定性的变更。另外，这些变更中的至少一种变更能够与实施方式所示例的锤钻1、及各技术方案所记载的发明的任一方组合使用。In addition, the above-mentioned embodiment is only an example, and the reciprocating tool involved in the present invention is not limited to the hammer drill 1 of the example. For example, the following non-limiting changes can be added. In addition, at least one of these changes can be used in combination with the hammer drill 1 of the embodiment and any one of the inventions described in the technical solutions.
例如，本发明所涉及的往复运动工具能够具体实施为，构成为仅进行冲击动作的冲击工具(例如，电动锤(demolition hammer,、scraper))、或者构成为通过使顶端工具(例如，刀片)往复运动来进行切割作业的往复运动切割工具(例如，往复锯)。For example, the reciprocating tool involved in the present invention can be specifically implemented as an impact tool that is configured to perform only impact action (for example, an electric hammer (demolition hammer, scraper)), or a reciprocating cutting tool that is configured to perform cutting operations by reciprocating the top tool (for example, a blade) (for example, a reciprocating saw).
本发明所涉及的往复运动工具中的主体壳体、内壳体、电机、顶端工具的驱动机构的结构和/或配置能够根据上述实施方式的例子适宜地变更。例如，电机也可以以电机轴线和驱动轴线平行地延伸的方式来配置。The structure and/or configuration of the main body housing, inner housing, motor, and driving mechanism of the top tool in the reciprocating tool of the present invention can be appropriately changed according to the examples of the above-mentioned embodiments. For example, the motor can also be configured in a manner that the motor axis and the driving axis extend in parallel.
本发明所涉及的平衡锤并非必须为环状，例如也可以形成为U字形。该变形例的平衡锤也可以通过贯插于在两端部形成的支承孔的支承轴225来支承于支承体22。在另一变形例中，与平衡锤一体地形成的支承轴也可以支承于支承体22。另外，本发明所涉及的平衡锤、和运动转换机构的摆动部件也可以在与上述实施方式的例子不同的位置以可进行动作的方式来连接。The counterweight involved in the present invention is not necessarily annular, and may be formed in a U-shape, for example. The counterweight of this modified example may also be supported by the support body 22 through a support shaft 225 inserted into a support hole formed at both ends. In another modified example, a support shaft formed integrally with the counterweight may also be supported by the support body 22. In addition, the counterweight involved in the present invention and the swinging member of the motion conversion mechanism may also be connected in a manner that allows for movement at a position different from the example of the above-mentioned embodiment.
本发明所涉及的支承体并非必须支承顶端工具保持部件(主轴40)，也可以仅为了支承平衡锤而设置。支承体的形状(例如，臂部223的形状和/或数量)也可以适宜地变更。另外，支承体也可以在其整体收容于内壳体的状态下被安装于内壳体。The support body involved in the present invention does not necessarily support the top tool holding component (spindle 40), and can also be provided only for supporting the counterweight. The shape of the support body (for example, the shape and/or number of the arm portion 223) can also be appropriately changed. In addition, the support body can also be installed in the inner housing in a state where it is entirely accommodated in the inner housing.
并且，鉴于本发明、上述实施方式及其变形例的主旨来构筑以下的方式A1～A8。以下方式中的至少一种方式能够与上述实施方式及其变形例、以及各技术方案所记载的发明的至少一个组合使用。Furthermore, the following aspects A1 to A8 are constructed based on the gist of the present invention, the above-mentioned embodiment and its modified examples. At least one of the following aspects can be used in combination with at least one of the above-mentioned embodiment and its modified examples, and the invention described in each claim.
[方式A1][Method A1]
所述内壳体从后方嵌入所述主体壳体的一部分。The inner housing is fitted into a portion of the main housing from behind.
[方式A2][Method A2]
所述内壳体是前方敞开，绕所述驱动轴线的周向和后方被封闭的中空体。The inner housing is a hollow body which is open at the front and closed at the circumference around the drive axis and at the rear.
[方式A3][Method A3]
所述支承轴在所述前后方向上位于所述内壳体的前端与后端之间。The support shaft is located between the front end and the rear end of the inner housing in the front-rear direction.
[方式A4][Mode A4]
在所述前后方向上，所述平衡锤的整体位于所述内壳体的前端与后端之间(位于所述内壳体的内部)。In the front-rear direction, the entirety of the counterweight is located between the front end and the rear end of the inner housing (located inside the inner housing).
[方式A5][Mode A5]
所述支承体的一部分位于所述内壳体的前方。A portion of the support body is located in front of the inner shell.
[方式A6][Mode A6]
所述内壳体的至少一部分在所述前后方向上位于所述吸气口的前方，At least a portion of the inner shell is located in front of the air inlet in the front-rear direction.
所述主体壳体具有用于引导从所述吸气口流入的空气的导向肋，The main body housing has guide ribs for guiding air flowing in from the air inlet.
所述导向肋与所述吸气口相邻设置，至少局部随着远离所述吸气口而向前方倾斜。The guide rib is disposed adjacent to the air inlet, and at least partially tilts forward as it moves away from the air inlet.
[方式A7][Mode A7]
所述运动转换机构包括：The motion conversion mechanism comprises:
旋转体，其被配置在所述中间轴的周围，且能够与所述中间轴一体地旋转；a rotating body disposed around the intermediate shaft and capable of rotating integrally with the intermediate shaft;
摆动部件，其构成为，以可进行动作的方式连接于所述旋转体，响应于所述旋转体的旋转而在所述驱动轴线的延伸方向上摆动；和a swing member movably connected to the rotating body and configured to swing in the extending direction of the drive axis in response to the rotation of the rotating body; and
活塞，其构成为，以可进行动作的方式连接于所述摆动部件，在所述顶端工具保持部件的内部沿所述驱动轴线往复运动。The piston is movably connected to the swing member and is configured to reciprocate along the drive axis within the tip tool holding member.
[方式A8][Mode A8]
所述运动转换机构包括：The motion conversion mechanism comprises:
旋转体，其被配置在所述中间轴的周围，与所述中间轴一体地旋转；和a rotating body disposed around the intermediate shaft and rotating integrally with the intermediate shaft; and
摆动部件，其构成为，以可进行动作的方式连接于所述旋转体，响应于所述旋转体的旋转而在所述驱动轴线的延伸方向上摆动，a swing member connected to the rotating body in an operable manner and configured to swing in the extending direction of the drive axis in response to the rotation of the rotating body;
所述平衡锤以可进行动作的方式与所述摆动部件相连接。The counterweight is movably connected to the swing member.
另外，以提供涉及排气结构的改善作为非限定性的1个目的，提供以下的方式B1～B13，其中，所述排气结构来自利用空气弹簧的冲击工具中的冲击机构的收容空间。以下的方式B1～B13能够单独使用或者将2个以上组合使用。或者，以下的方式B1～B13中的至少一种方式能够与实施方式的锤钻1、上述的变形例、方式A1～A8、以及各技术方案所记载的特征中的至少1个组合使用。In addition, for the purpose of providing an improvement related to the exhaust structure as a non-limiting purpose, the following methods B1 to B13 are provided, wherein the exhaust structure comes from the storage space of the impact mechanism in the impact tool using the air spring. The following methods B1 to B13 can be used alone or in combination of two or more. Alternatively, at least one of the following methods B1 to B13 can be used in combination with the hammer drill 1 of the embodiment, the above-mentioned modified example, methods A1 to A8, and at least one of the features described in each technical solution.
[方式B1][Mode B1]
一种冲击工具，其特征在于，An impact tool, characterized in that:
具有：have:
电机，其具有固定有第1锥齿轮的电机轴；A motor having a motor shaft to which a first bevel gear is fixed;
冲击机构，其通过与所述第1锥齿轮啮合的第2锥齿轮以可进行动作的方式连接于所述电机轴，且构成为利用空气弹簧的作用沿着驱动轴线呈直线状驱动顶端工具；an impact mechanism operatively connected to the motor shaft via a second bevel gear meshing with the first bevel gear and configured to linearly drive the top tool along the drive axis by utilizing the action of an air spring;
主体壳体，其收容所述电机和所述冲击机构；和a main body housing that accommodates the motor and the impact mechanism; and
内壳体，其被配置在所述主体壳体的内部，an inner shell, which is arranged inside the main shell,
在所述主体壳体的内部规定出收容所述冲击机构和润滑剂的被密闭的收容空间，A sealed accommodation space for accommodating the impact mechanism and the lubricant is defined inside the main body shell.
所述内壳体构成为，至少局部规定所述收容空间，The inner shell is configured to at least partially define the accommodation space.
在所述内壳体形成有排气孔，所述排气孔具有面向所述内壳体的内部的入口、和面向所述内壳体的外部的出口，An exhaust hole is formed in the inner shell, and the exhaust hole has an inlet facing the inside of the inner shell and an outlet facing the outside of the inner shell.
所述排气孔的所述入口在所述第1锥齿轮和所述第2锥齿轮中的一方的径向上，被配置在比齿轮齿的内周端靠径向内侧的位置。The inlet of the exhaust hole is arranged radially inward of an inner peripheral end of a gear tooth in a radial direction of one of the first bevel gear and the second bevel gear.
在本方式的冲击工具中，在主体壳体的内部规定出的收容空间内收容有冲击机构和润滑剂。收容空间是至少局部由内壳体规定出的被密闭的空间，但能够通过内壳体的排气孔进行空气的流通。因此，即使由于伴随着冲击机构的驱动而发热使收容空间的内部压力上升，通过利用排气孔使空气从收容空间流出，能够调节内部压力，降低发生空气弹簧的动作不良的可能性。In the impact tool of this mode, the impact mechanism and the lubricant are accommodated in the accommodation space defined inside the main body shell. The accommodation space is a sealed space defined at least partially by the inner shell, but air can circulate through the exhaust hole of the inner shell. Therefore, even if the internal pressure of the accommodation space rises due to heat generated by driving the impact mechanism, the internal pressure can be adjusted by using the exhaust hole to make air flow out of the accommodation space, thereby reducing the possibility of malfunction of the air spring.
另外，排气孔的入口被配置在比第1锥齿轮和第2锥齿轮中的一方的齿轮齿的内周端靠径向内侧的位置。因此，当驱动冲击机构时，第1锥齿轮和第2锥齿轮中的一方旋转，据此能够有效地防止润滑剂到达空气孔的入口。第1锥齿轮和第2锥齿轮是用于从电机向冲击机构传递振动的零部件。因此，根据本方式的结构，能够有效使用第1锥齿轮或者第2锥齿轮，无需增加零部件数而有效地降低润滑剂漏出的可能性。In addition, the entrance of the exhaust hole is arranged at a position radially inward of the inner peripheral end of the gear teeth of one of the first bevel gear and the second bevel gear. Therefore, when the impact mechanism is driven, one of the first bevel gear and the second bevel gear rotates, thereby effectively preventing the lubricant from reaching the entrance of the air hole. The first bevel gear and the second bevel gear are components for transmitting vibration from the motor to the impact mechanism. Therefore, according to the structure of this method, the first bevel gear or the second bevel gear can be effectively used, and the possibility of lubricant leakage can be effectively reduced without increasing the number of components.
[方式B2][Method B2]
根据方式B1所述的冲击工具，其特征在于，The impact tool according to embodiment B1 is characterized in that:
所述排气孔的所述入口在所述第2锥齿轮的径向上，被配置在比所述第2锥齿轮的所述齿轮齿的所述内周端靠径向内侧的位置。The inlet of the exhaust hole is arranged radially inward of the inner peripheral end of the gear tooth of the second bevel gear in the radial direction of the second bevel gear.
根据该方式，能够在内壳体比较容易地形成排气孔。一般而言，为了减速，第2锥齿轮的直径比第1锥齿轮大。因此，在该情况下，通过与第2锥齿轮对应来设置排气孔，能够使从第2锥齿轮的径向外侧到排气孔的入口的流路比第1锥齿轮的情况下长。因此，在第2锥齿轮是直径比第1锥齿轮大的齿轮的情况下，优选为排气孔与第2锥齿轮对应设置。According to this method, the exhaust hole can be formed relatively easily in the inner housing. Generally speaking, in order to reduce speed, the diameter of the second bevel gear is larger than that of the first bevel gear. Therefore, in this case, by providing the exhaust hole corresponding to the second bevel gear, the flow path from the radial outer side of the second bevel gear to the inlet of the exhaust hole can be made longer than that of the first bevel gear. Therefore, in the case where the second bevel gear is a gear having a larger diameter than the first bevel gear, it is preferred that the exhaust hole is provided corresponding to the second bevel gear.
[方式B3][Mode B3]
根据方式B2所述的冲击工具，其特征在于，The impact tool according to embodiment B2 is characterized in that:
所述排气孔的所述入口位于所述第2锥齿轮的旋转轴线上。The inlet of the exhaust hole is located on the rotation axis of the second bevel gear.
根据该方式，能够在润滑剂最难以到达的位置配置入口。According to this aspect, the inlet can be arranged at a position where the lubricant is most difficult to reach.
[方式B4][Mode B4]
根据方式B2或B3所述的冲击工具，其特征在于，The impact tool according to mode B2 or B3 is characterized in that:
还具有中间轴，所述中间轴以可进行动作的方式连接于所述电机轴，能够绕与所述驱动轴线平行地延伸的旋转轴线进行旋转，The motor shaft further comprises an intermediate shaft movably connected to the motor shaft and rotatable about a rotation axis extending parallel to the drive axis.
所述冲击机构包括运动转换机构，所述运动转换机构构成为，局部配置在所述中间轴上，将所述中间轴的旋转运动转换为用于驱动所述顶端工具的沿着所述驱动轴线的延伸方向的直线运动，The impact mechanism includes a motion conversion mechanism, which is partially arranged on the intermediate shaft and is configured to convert the rotational motion of the intermediate shaft into a linear motion along the extension direction of the drive axis for driving the top tool.
所述第2锥齿轮被固定于所述中间轴。The second bevel gear is fixed to the intermediate shaft.
根据该方式，能够利用设置有运动转换机构的一部分的中间轴的第2锥齿轮，有效地抑制润滑剂从收容空间漏出。According to this aspect, the second bevel gear of the intermediate shaft on which a part of the motion conversion mechanism is provided can effectively suppress the leakage of the lubricant from the accommodation space.
[方式B5][Mode B5]
根据方式B4所述的冲击工具，其特征在于，The impact tool according to embodiment B4 is characterized in that:
还具有轴承，所述轴承被支承于所述内壳体，将所述第2锥齿轮可旋转地进行支承，A bearing is further provided, the bearing being supported by the inner housing and rotatably supporting the second bevel gear.
所述中间轴通过所述第2锥齿轮以可旋转的方式被支承。The intermediate shaft is rotatably supported by the second bevel gear.
根据该方式，与中间轴的一部分被直接支承于轴承的结构相比较，能够缩短中间轴。According to this aspect, the intermediate shaft can be shortened compared to a structure in which a part of the intermediate shaft is directly supported by the bearing.
[方式B6][mode B6]
根据方式B1～B5中任一项所述的冲击工具，其特征在于，The impact tool according to any one of aspects B1 to B5 is characterized in that:
所述内壳体具有突出部，所述突出部向所述第1锥齿轮和所述第2锥齿轮中的所述一方突出，The inner housing has a protrusion, and the protrusion protrudes toward the one of the first bevel gear and the second bevel gear.
所述排气孔贯通所述突出部，The exhaust hole passes through the protrusion,
所述入口位于所述突出部的顶端，The inlet is located at the top of the protrusion,
所述突出部在所述第1锥齿轮和所述第2锥齿轮中的所述一方的轴向上，至少延伸到所述第1锥齿轮和所述第2锥齿轮中的所述一方的内部。The protrusion extends at least into the interior of the one of the first bevel gear and the second bevel gear in the axial direction of the one of the first bevel gear and the second bevel gear.
根据该方式，形成从第1锥齿轮和第2锥齿轮中的一方、或者中间轴的顶端延伸到排气孔的入口的通路，从通路进入排气孔需要变换方向。因此，能够更可靠地降低润滑剂漏出的可能性。According to this embodiment, a passage extending from one of the first bevel gear and the second bevel gear or the top end of the intermediate shaft to the entrance of the exhaust hole is formed, and a direction change is required to enter the exhaust hole from the passage. Therefore, the possibility of lubricant leakage can be more reliably reduced.
[方式B7][mode B7]
根据方式B6所述的冲击工具，其特征在于，The impact tool according to mode B6 is characterized in that:
还具有旋转轴，所述旋转轴能够绕沿所述冲击工具的前后方向延伸的轴线进行旋转，The impact tool further comprises a rotation shaft which is rotatable about an axis extending in the front-rear direction of the impact tool.
所述第2锥齿轮被固定于所述旋转轴的后端部，The second bevel gear is fixed to the rear end of the rotating shaft.
所述第2锥齿轮的后端位于比所述旋转轴的后端靠后方的位置，The rear end of the second bevel gear is located behind the rear end of the rotating shaft.
所述突出部从所述内壳体向前方突出，且延伸到所述旋转轴的内部。The protrusion protrudes forward from the inner housing and extends into the interior of the rotating shaft.
根据该方式，形成有通过第2锥齿轮的内部和旋转轴的内部而延伸到排气孔的入口的通路。因此，例如，能够单独设计该通路中的位于第2锥齿轮的内部的部分和位于旋转轴的内部的部分。According to this embodiment, a passage extending to the inlet of the exhaust hole through the inside of the second bevel gear and the inside of the rotating shaft is formed. Therefore, for example, the part located inside the second bevel gear and the part located inside the rotating shaft in the passage can be designed separately.
[方式B8][mode B8]
根据方式B1～B7中任一项所述的冲击工具，其特征在于，The impact tool according to any one of aspects B1 to B7 is characterized in that:
所述第1锥齿轮和所述第2锥齿轮中的所述一方的所述齿轮齿的顶端与所述内壳体的内表面之间的距离小于所述齿轮齿的齿高。A distance between a tip of the gear tooth of the one of the first bevel gear and the second bevel gear and an inner surface of the inner housing is smaller than a tooth height of the gear tooth.
[方式B9][mode B9]
根据方式B8所述的冲击工具，其特征在于，The impact tool according to mode B8 is characterized in that:
所述第1锥齿轮和所述第2锥齿轮中的所述一方的所述齿轮齿的所述顶端与所述内壳体的所述内表面之间的所述距离实质上是一定的。The distance between the tip of the gear tooth of the one of the first bevel gear and the second bevel gear and the inner surface of the inner housing is substantially constant.
根据这些方式，能够使润滑剂不易通过第1锥齿轮和第2锥齿轮中的一方的齿轮齿的顶端与内壳体的内表面之间。According to these aspects, it is possible to make it difficult for the lubricant to pass between the tip of the gear teeth of one of the first bevel gear and the second bevel gear and the inner surface of the inner housing.
[方式B10][mode B10]
所述第2锥齿轮的直径比所述第1锥齿轮的直径大。The diameter of the second bevel gear is larger than the diameter of the first bevel gear.
[方式B11][style B11]
所述第1锥齿轮被配置在所述收容空间内。The first bevel gear is arranged in the accommodation space.
[方式B12][mode B12]
在所述第2锥齿轮和所述中间轴中的至少一方，形成有沿所述中间轴的所述旋转轴线延伸的凹部，A recessed portion extending along the rotation axis of the intermediate shaft is formed in at least one of the second bevel gear and the intermediate shaft.
所述内壳体的所述突出部向所述凹部的内部突出，The protrusion of the inner shell protrudes toward the inside of the recess,
所述排气孔与所述凹部的内部空间相连通。The exhaust hole is communicated with the inner space of the recess.
[方式B13][mode B13]
所述轴承独立于所述内壳体而形成，在所述收容空间内通过安装于所述内壳体的轴承支承部件被支承，The bearing is formed independently of the inner housing and is supported in the accommodation space by a bearing support member mounted on the inner housing.
所述第2锥齿轮被配置在所述内壳体与所述轴承支承部件之间。The second bevel gear is arranged between the inner housing and the bearing support member.
另外，上述实施方式仅仅是示例，B1～B13所涉及的冲击工具并不限定于示例的锤钻1。例如，能够增加以下所示例的非限定性的变更。另外，这些变更中的至少一种变更能够与实施方式所示例的锤钻1、及各技术方案所记载的发明中的任一方组合使用。In addition, the above-mentioned embodiment is only an example, and the impact tool involved in B1 to B13 is not limited to the hammer drill 1 of the example. For example, the non-limiting changes exemplified below can be added. In addition, at least one of these changes can be used in combination with the hammer drill 1 exemplified in the embodiment and any one of the inventions described in the technical claims.
例如，本发明所涉及的冲击工具能够具体实施为，构成为仅进行冲击动作的冲击工具(例如，电动锤(demolition hammer,scraper))。另外，冲击工具中的主体壳体、内壳体、电机、冲击机构的结构和/或配置能够根据上述实施方式的例子适宜地变更。For example, the impact tool of the present invention can be specifically implemented as an impact tool configured to perform only an impact action (e.g., a demolition hammer, scraper). In addition, the structure and/or arrangement of the main body housing, inner housing, motor, and impact mechanism in the impact tool can be appropriately changed according to the examples of the above-mentioned embodiments.
在上述实施方式中，排气孔24的入口241以与被固定于中间轴52的第2锥齿轮53的中心(旋转轴线RX)对应的方式来设置，因此，入口241位于润滑剂最难以到达的位置，在该方面是优选的。然而，入口241能够变更为，在第2锥齿轮53的径向上，与比齿轮齿531的内周端靠径向内侧的区域对应的任意位置。另外，排气孔24可以相对于旋转轴线RX倾斜地呈直线状延伸，也可以弯折，还可以弯曲。另外，也可以省略内壳体20的突出部205、第2锥齿轮53及中间轴52的凹部25，排气孔24的入口241与第2锥齿轮53的后端面相向。In the above-mentioned embodiment, the inlet 241 of the exhaust hole 24 is arranged in a manner corresponding to the center (rotation axis RX) of the second bevel gear 53 fixed to the intermediate shaft 52, and therefore, the inlet 241 is located at a position that is most difficult for the lubricant to reach, which is preferable in this respect. However, the inlet 241 can be changed to any position corresponding to an area radially inward of the inner circumferential end of the gear tooth 531 in the radial direction of the second bevel gear 53. In addition, the exhaust hole 24 can extend linearly at an angle relative to the rotation axis RX, or it can be bent or curved. In addition, the protrusion 205 of the inner housing 20, the second bevel gear 53 and the recess 25 of the intermediate shaft 52 can also be omitted, and the inlet 241 of the exhaust hole 24 faces the rear end surface of the second bevel gear 53.
另外，在上述实施方式中，第2锥齿轮53的直径大，因此，考虑到上述的优点，排气孔24以与第2锥齿轮53对应的方式来设置。然而，不排除排气孔24与第1锥齿轮33对应来设置。In the above embodiment, the diameter of the second bevel gear 53 is large, and therefore, in consideration of the above advantages, the exhaust hole 24 is provided to correspond to the second bevel gear 53. However, the exhaust hole 24 may be provided to correspond to the first bevel gear 33.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-177511 | 2022-11-04 | ||
| JP2023-104868 | 2023-06-27 | ||
| JP2023-104865 | 2023-06-27 | ||
| JP2023104868AJP2025004949A (en) | 2023-06-27 | 2023-06-27 | Impact tools |
| Publication Number | Publication Date |
|---|---|
| CN117984274Atrue CN117984274A (en) | 2024-05-07 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311438558.3APendingCN117984274A (en) | 2022-11-04 | 2023-11-01 | Reciprocating tools |
| Country | Link |
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| JP (1) | JP2025004949A (en) |
| CN (1) | CN117984274A (en) |
| Publication number | Publication date |
|---|---|
| JP2025004949A (en) | 2025-01-16 |
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