CN215545159U - Lithium electric percussion drill - Google Patents

Abstract

The application provides a lithium electric percussion drill, which comprises a shell, a main shaft arranged in the shell, a transmission mechanism for transmitting power to the main shaft, a first end tooth unit fixed on the main shaft, a second end tooth unit capable of being meshed with the first end tooth unit, and a first operating piece for driving the first end tooth unit and the second end tooth unit to be meshed, wherein the second end tooth unit and the first end tooth unit have a first meshing mode and a second meshing mode, and the meshing depth in the first meshing mode is not equal to that in the second meshing mode; the lithium electric percussion drill further comprises a second operating piece and a third operating piece, wherein the second operating piece is configured to drive the second end tooth unit so as to realize switching between a first meshing mode and a second meshing mode; the third operating element is configured to adjust the output torque of the main shaft; the first operating piece, the second operating piece and the third operating piece are rotating pieces and are arranged in sequence in the extending direction of the main shaft. The lithium electric percussion drill has multiple impact modes and is convenient for users to switch functions.

Description

Lithium electric percussion drill

Technical Field

The application relates to the field of electric tools, in particular to a lithium electric percussion drill.

Background

The lithium electric percussion drill is an electric tool integrating functions of drilling, impacting and the like, and can be used for drilling holes in materials such as ceramic tiles, metal sheets, brick walls and the like. For the ceramic tile, the impact strength is not too high, otherwise the ceramic tile is easy to crack; for brick walls, a higher impact force is required or the efficiency of the punching will be compromised. The main lithium electric percussion drill in the existing market only has one percussion mode, and the requirements of different application scenes are difficult to meet.

SUMMERY OF THE UTILITY MODEL

The application provides a lithium electric percussion drill with multiple impact mode, and the user can conveniently carry out the function switching.

Specifically, the application provides a lithium electric percussion drill, including the casing, set up the main shaft in the casing, for the drive mechanism of main shaft transmission power, be fixed in the main shaft and can be along with the first end tooth unit of main shaft motion, can with the second end tooth unit that first end tooth unit meshed, drive first operating parts that first end tooth unit and second end tooth unit meshed, second end tooth unit and first end tooth unit have first meshing mode and second meshing mode, the depth of mesh under the first meshing mode is not equal with the depth of mesh under the second meshing mode; the lithium electric percussion drill further comprises a second operating piece and a third operating piece, wherein the second operating piece is configured to drive the second end tooth unit so as to realize switching between a first meshing mode and a second meshing mode; the third operating member is configured to adjust an output torque of the main shaft; the first operating piece, the second operating piece and the third operating piece are rotating pieces and are arranged in sequence in the extending direction of the main shaft.

Further, the second end tooth unit comprises a first tooth element and a second tooth element, the first tooth element and the second tooth element are arranged in a manner that the rotation motion is limited, and the lithium electric percussion drill further comprises a second driving unit, and the second driving unit is configured to drive the second tooth element to move along the axial direction of the main shaft; in the first engagement mode, the first end tooth unit is fully engaged with the first tooth member; in the second engagement mode, the first end tooth unit is fully engaged with the second tooth member, partially engaged or not engaged with the first tooth member.

Further, the second tooth member is located inside the first tooth member, the housing restricts rotational movement of the first tooth member, the first tooth member restricts rotational movement of the second tooth member and allows axial movement of the second tooth member along the main shaft; in the first engagement mode, the first end tooth unit is fully engaged with the first tooth member and partially engaged with the second tooth member.

Further, the first tooth member includes a first engagement tooth, the second tooth member includes a second engagement tooth, the first end tooth member includes a third engagement tooth, the height of the first engagement tooth and the height of the third engagement tooth are greater than the height of the second engagement tooth, and the depth of engagement of the first engagement pattern is greater than the depth of engagement of the second engagement pattern; the second driving unit is configured to drive the second tooth element to move in a direction close to the first end tooth unit so as to realize the switching from the first meshing mode to the second meshing mode; in the second engagement mode, the first end tooth unit is partially engaged with the first tooth member and fully engaged with the second tooth member.

Further, a ratio of a depth of engagement of the first engagement pattern to a depth of engagement of the second engagement pattern is not less than 3/2 and not greater than 5/2.

Furthermore, the first tooth element comprises a space for accommodating the spindle and the second tooth element and a notch communicated with the space, the notch is positioned outside the space, and the second tooth element comprises a second positioning part which is matched with the notch in shape so as to limit the rotation movement of the second tooth element.

Further, the second driving unit comprises a second operating member and a second transmission member, the second transmission member abuts against the second tooth element, and the second operating member drives the second tooth element to move axially through the second transmission member; the second operating part is provided with a second inner surface which is pressed against the second transmission part, the radius of the second inner surface is reduced along the circumferential direction, and the second transmission part moves linearly when the second operating part is rotated to drive the second tooth element to move along the axial direction.

Further, the moving directions of the second transmission pieces are perpendicular to the axial direction.

Further, the first tooth element includes a first detent that is form-fit with the housing to limit rotational movement of the first tooth element; the second transmission piece is abutted against the front end face of the second tooth element, and the front end face is formed on one side, far away from the first end tooth unit, of the second tooth element.

Furthermore, the first positioning portion is provided with a through hole, and the second transmission piece passes through the through hole and abuts against the front end face of the second tooth element.

In this application, the depth of engagement inequality under different mesh modes of second end tooth unit and first end tooth unit, therefore provide different impact strokes to make lithium electric percussion drill have strong impact mode and weak impact mode, first operating parts, second operating parts and third operating parts are in addition and rotate the piece and arrange in proper order in the extending direction of main shaft, the switching that different functions were carried out to the user of being convenient for uses the other hand that does not hold the handle.

Drawings

Fig. 1 is a perspective view of an embodiment of a lithium electric percussion drill according to the present application.

Fig. 2 is a schematic cross-sectional view of the lithium-ion hammer drill shown in fig. 1.

Fig. 3 is a schematic perspective view of the first end tooth unit, the second driving unit, the main shaft, and other structures of the lithium electric percussion drill shown in fig. 1.

Fig. 4 is a perspective view of the structure shown in fig. 3.

Fig. 5 is a schematic cross-sectional view of the structure shown in fig. 3, wherein the lithium hammer drill is in a first engagement mode.

Fig. 6 is a partially enlarged view of fig. 5.

Fig. 7 is a schematic view showing the engagement of the first end tooth unit and the second end tooth unit shown in fig. 5.

Fig. 8 is a schematic cross-sectional view of the structure shown in fig. 3 with the lithium hammer drill in a second engagement mode.

Fig. 9 is a partially enlarged view of fig. 8.

Fig. 10 is a schematic view of the engagement of the first end tooth unit and the second end tooth unit shown in fig. 8.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The application provides a lithium electric percussion drill, which comprises a shell, a main shaft arranged in the shell, a transmission mechanism for transmitting power to the main shaft, a first end tooth unit fixed on the main shaft and capable of moving along with the main shaft, a second end tooth unit capable of being meshed with the first end tooth unit, and a first operating piece for driving the first end tooth unit and the second end tooth unit to be meshed, wherein the second end tooth unit and the first end tooth unit have a first meshing mode and a second meshing mode, and the meshing depth in the first meshing mode is not equal to that in the second meshing mode; the lithium electric percussion drill further comprises a second operating piece and a third operating piece, wherein the second operating piece is configured to drive the second end tooth unit so as to realize switching between a first meshing mode and a second meshing mode; the third operating member is configured to adjust an output torque of the main shaft. The first operating piece, the second operating piece and the third operating piece are rotating pieces and are arranged in sequence in the extending direction of the main shaft.

Referring to fig. 1 and 2, the lithium electric percussion drill of the present embodiment includes ahousing 1, amotor 2 disposed in the housing, aspindle 4, atransmission mechanism 3 for transmitting power of themotor 2 to thespindle 4, a firstend tooth unit 5 fixed to thespindle 4 and movable along with the spindle, a second end tooth unit 6 capable of meshing with the firstend tooth unit 5, a first driving unit 71 for driving the firstend tooth unit 5 to mesh with the second end tooth unit 6, and abattery pack 8 for supplying power to the motor. It is noted that the housing contains the main supporting mechanisms such as the housing, gearbox housing, motor housing, etc. In other embodiments, an ac power source may be used, i.e., the lithium-ion hammer drill may not include a battery pack.

Lithium electricity percussion drill roughly is pistol form, andcasing 1 includes casing 11 and theportion 12 of holding of connecting casing 11, andtrigger switch 13 sets up in the region of being connected ofportion 12 and casing 11 that holds, be provided withfirst operating parts 711,second operating parts 721 and third operating parts 731 on the casing 11, be used for adjusting mode (impact mode, drilling mode and screw mode), adjustment impact mode (first impact mode and second impact mode), adjust the moment of torsion (the torque adjustment mode is the same or similar with the regulation mode that current percussion drill). Thefirst operating member 711, thesecond operating member 721 and the third operatingmember 73 are all rotational members and are arranged in sequence along the axial direction, and a user can operate the second operating member by operating thefirst operating member 711 and thethird operating member 73, thereby facilitating the simplification of the operation.

When the firstend tooth unit 5 and the second end tooth unit 6 are not meshed, the transmission mechanism directly transmits the rotary motion to themain shaft 4, and themain shaft 4 drives the working head to rotate; when the firstend tooth unit 5 is engaged with the second end tooth unit 6, the engaging teeth of the firstend tooth unit 5 need to cross the engaging teeth of the second end tooth unit 6 to rotate, thereby realizing the impact action of the main shaft. Thetransmission 3 is usually selected as a reduction gearbox.

Referring to fig. 3 and 4, the firstend tooth unit 5 is fixed to themain shaft 4, and the main shaft passes through the firstend tooth unit 5. The second end tooth unit 6 includes afirst tooth member 61 and asecond tooth member 62 located inside thefirst tooth member 61, thefirst tooth member 61 and thesecond tooth member 62 are provided in such a manner that rotational movement is restricted, and the lithium electric hammer drill further includes asecond driving unit 72, thesecond driving unit 72 is configured to drive thesecond tooth member 62 to move in an axial direction of the main shaft, so that the second end tooth unit 6 and the firstend tooth unit 5 have a first engagement mode (see fig. 5 to 7) and a second engagement mode (see fig. 8 to 10).

Thefirst tooth member 61 includes a firstengaging tooth 611 facing the firstend tooth unit 5, and thesecond tooth member 62 includes a secondengaging tooth 621 facing the firstend tooth unit 5, the height of the firstengaging tooth 611 is greater than that of the secondengaging tooth 621, and the height is understood as the vertical distance from the bottom to the top of the engaging tooth when the first tooth member (or the second tooth member) is placed with the engaging tooth facing upward. The firstend tooth unit 5 includes a thirdengaging tooth 51 facing the second end tooth unit 6, and the height of the thirdengaging tooth 51 is greater than that of the secondengaging tooth 621. Preferably, the height of thethird engagement tooth 51 is equal to the height of thefirst engagement tooth 611.

As shown in fig. 5 to 7, in the first engagement mode, thethird engagement tooth 51 of the firstend tooth unit 5 is engaged (preferably completely engaged) with thefirst engagement tooth 611 of thefirst tooth unit 61, and is partially engaged (or disengaged) with thesecond engagement tooth 621 of thesecond tooth unit 62; referring to fig. 8 to 10, in the second engagement mode, thethird engagement tooth 51 of the firstend tooth unit 5 is partially engaged with (or disengaged from) thefirst engagement tooth 611 of thefirst tooth unit 61, and is fully engaged with thesecond engagement tooth 621 of thesecond tooth unit 62, and since the height of thesecond engagement tooth 621 is small, the degree of engagement between thethird engagement tooth 51 and thefirst engagement tooth 611 is affected (i.e., only partial engagement can be achieved), so that the impact stroke of the lithium electric hammer drill is smaller than that in the first engagement mode.

The partially engaged and fully engaged states of the meshing teeth (or end tooth members) can be seen with reference to fig. 7 and 10. It is understood that, on the premise of full engagement, since the heights of the first engaging tooth and the third engaging tooth are both greater than the height of the second engaging tooth, the depth of engagement of the first engaging tooth with the third engaging tooth is greater than the depth of engagement of the first engaging tooth with the third engaging tooth, that is, the depth of engagement of the first engagement pattern is greater than the depth of engagement of the second engagement pattern. The depth of engagement is understood to mean the distance in the axial direction between the tips of two meshing teeth that mesh, for example d1 (axial distance of the first meshing tooth from the third meshing tooth) and d2 (axial distance of the second meshing tooth from the third meshing tooth) shown in fig. 7.

The first driving unit 71 includes thefirst operating part 711 and a first transmission part 712 (see fig. 3), thefirst operating part 711 is a knob structure, and when rotating, thefirst operating part 711 drives thefirst transmission part 712 to axially move, and further drives the firstend tooth unit 5 and themain shaft 4 to axially move so as to engage with or disengage from the second end tooth unit 6, thereby realizing switching between a rotation mode and an impact mode.

The second driving unit includes thesecond operating element 721, asecond transmission member 722 and areturn spring 723, thesecond transmission member 722 abuts against thesecond tooth unit 62, and thereturn spring 723 is disposed between thesecond transmission member 722 and thefirst tooth unit 61. Thesecond operation member 721 can also be a knob structure, and thesecond operation member 721 drives thesecond transmission member 722 to move in the radial direction when being operated by a user. Specifically, thesecond operating member 721 has a secondinner surface 7211 that presses against thesecond transmission member 722, a radius of the secondinner surface 7211 decreases in a circumferential direction (e.g., clockwise), and thesecond transmission member 722 moves linearly when thesecond operating member 721 is rotated, so as to push thesecond gear element 62 to move axially. Thesecond transmission piece 722 includes aforce receiving portion 7221 and aforce applying portion 7222 connected to each other, theforce receiving portion 7221 is larger than theforce applying portion 7222, theforce applying portion 7222 passes through the throughhole 6100 of thefirst positioning portion 610 and abuts against the front end surface 620 of thesecond tooth element 62, and the front end surface 620 is formed on the side of thesecond tooth element 62 away from the firstend tooth unit 5, that is, the end surface of the non-tooth end. Thereturn spring 723 is sleeved on theforce application portion 7222, and two ends of the return spring respectively abut against theforce receiving portion 7221 and thesecond tooth element 62. Thesecond operating member 721 drives thesecond tooth element 62 to move axially through thesecond transmission member 722, in this embodiment, thesecond tooth element 62 is driven to approach the firstend tooth unit 5 axially. It is easy to understand that the rotating direction of thesecond operating member 721 and the moving direction of thesecond transmission member 722 are perpendicular to the axial direction. Thesecond transmission member 722 and thesecond tooth element 62 are provided with substantially parallel chamfered surfaces to facilitate the conversion of the driving force perpendicular to the axial direction into the driving force along the axial direction.

Referring to fig. 8 to 10, when the second operating element is rotated clockwise, thesecond transmission member 722 moves in a direction approaching themain shaft 4, thesecond tooth unit 62 pushes the firstend tooth unit 5 in the axial direction to reach the first position, the tooth end (the end where the tooth is disposed) of thefirst tooth unit 61 is aligned with the tooth end of thesecond tooth unit 62, thesecond tooth unit 62 is completely engaged with the firstend tooth unit 5, and simultaneously thefirst tooth unit 61 and the firstend tooth unit 5 are switched from the complete engagement mode state to the partial engagement state, at which the lithium drill hammer is in the second engagement mode. In this mode, the firstengaging teeth 51 of the firstend tooth unit 5 only need to pass over the secondengaging teeth 621 having a smaller height when rotating, and thus the stroke of this engaging mode is smaller, i.e., a weak impact mode, which is suitable for impact of a brittle material such as a tile.

Referring to fig. 5 to 7, when the second operating element is rotated clockwise, thesecond transmission member 722 moves in a direction away from themain shaft 4, thesecond tooth unit 62 is axially away from the firstend tooth unit 5 due to the second transmission member no longer acting thereon, and is disengaged (or partially engaged) with the firstend tooth unit 5, at this time, thesecond tooth unit 62 reaches the second position and the non-tooth end is aligned with the non-tooth end of the first tooth unit, at this time, the firstend tooth unit 5 is completely engaged with thefirst tooth unit 61 again, and the lithium electric hammer drill is in the first engagement mode. In this mode, the first engagingtooth 51 of the firstend tooth unit 5 needs to pass over the firstengaging tooth 611 with a larger height during rotation, so that the downward stroke of the engaging mode is larger, that is, the impact mode is a strong impact mode, and is suitable for impact of materials with larger strength, such as brick walls and the like. Optionally, the first engagement mode corresponds to an initial impact mode.

In some embodiments, the firstend tooth unit 5 may not fully engage with the firstend tooth unit 5 in the first engagement mode, as long as it is ensured that the degree of engagement is greater than in the second engagement mode; in other embodiments, the meshing degree of the first meshing mode may also be smaller than that of the second meshing mode, and correspondingly, the height of the first meshing tooth is smaller than that of the second meshing tooth, and the first end tooth unit is completely meshed with the second tooth unit and is separated from the first tooth unit in the strong impact mode; in still other embodiments, thefirst tooth unit 61 can be driven to move away from or close to the firstend tooth unit 5, and thesecond tooth unit 62 can be fixed; and will not be described in detail herein.

In the weak impact mode, since thefirst tooth unit 61 or thesecond tooth unit 62 can always support the firstend tooth unit 5 without causing the third engagingtooth 51 of the firstend tooth unit 5 to have a half-suspended state, the stability of the impact action is ensured.

Alternatively, the ratio of the depth of engagement of the first engagement pattern to the depth of engagement of the second engagement pattern is not less than 3/2 and not more than 5/2, within which a strong impact mode and a weak impact mode can be distinguished with a clear impact strength to be suitable for impacts of different materials.

The specific structure of thefirst tooth unit 61 and thesecond tooth unit 62 will be described, wherein thefirst tooth unit 61 includes afirst positioning portion 610, aspace 612 for accommodating thespindle 4 and thesecond tooth member 62, and anotch 613 communicating with thespace 612, thenotch 613 is located outside thespace 612, and thefirst positioning portion 610 is used for fixing with thehousing 1. Thesecond tooth element 62 includes asecond positioning portion 622, and thepositioning portion 622 is matched with thenotch 613 in shape to limit the rotation of thesecond tooth element 62. Part of the secondengaging teeth 621A is formed at the positioning portion.

The second end tooth unit and the first end tooth unit are not equal in meshing depth under different meshing modes, so that different impact strokes are provided, the lithium electric percussion drill is enabled to have a strong impact mode and a weak impact mode, and in addition, the first operating piece, the second operating piece and the third operating piece are rotating pieces and are sequentially arranged in the extending direction of the main shaft, so that a user can conveniently use the other hand which does not hold the handle to switch different functions.

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims (10)

1. A lithium electric percussion drill comprises a shell, a main shaft arranged in the shell, a transmission mechanism for transmitting power to the main shaft, a first end tooth unit fixed on the main shaft and capable of moving along with the main shaft, a second end tooth unit capable of being meshed with the first end tooth unit, and a first operating part driving the first end tooth unit and the second end tooth unit to be meshed, and is characterized in that,

the second end tooth unit and the first end tooth unit have a first meshing mode and a second meshing mode, and the meshing depth in the first meshing mode is not equal to the meshing depth in the second meshing mode;

the lithium electric percussion drill further comprises a second operating piece and a third operating piece, wherein the second operating piece is configured to drive the second end tooth unit so as to realize switching between a first meshing mode and a second meshing mode; the third operating member is configured to adjust an output torque of the main shaft;

the first operating piece, the second operating piece and the third operating piece are rotating pieces and are arranged in sequence in the extending direction of the main shaft.

2. The lithium electric percussion drill according to claim 1, wherein the second end-tooth unit comprises a first tooth element and a second tooth element, the first tooth element and the second tooth element being arranged in such a way that rotational movement is limited, the lithium electric percussion drill further comprising a second drive unit configured to drive the second tooth element to move in an axial direction of the main shaft;

in the first engagement mode, the first end tooth unit is fully engaged with the first tooth member; in the second engagement mode, the first end tooth unit is fully engaged with the second tooth member, partially engaged or not engaged with the first tooth member.

3. The lithium electric hammer drill according to claim 2, wherein the second tooth element is located inside the first tooth element, the housing limits rotational movement of the first tooth element, the first tooth element limits rotational movement of the second tooth element and allows axial movement of the second tooth element along the spindle;

in the first engagement mode, the first end tooth unit is fully engaged with the first tooth member and partially engaged with the second tooth member.

4. The lithium electric percussion drill according to claim 3, wherein the first tooth element comprises a first tooth engagement, the second tooth element comprises a second tooth engagement, the first end tooth element comprises a third tooth engagement, the height of the first tooth engagement and the height of the third tooth engagement are greater than the height of the second tooth engagement, and the depth of engagement of the first engagement pattern is greater than the depth of engagement of the second engagement pattern;

the second driving unit is configured to drive the second tooth element to move in a direction close to the first end tooth unit so as to realize the switching from the first meshing mode to the second meshing mode;

in the second engagement mode, the first end tooth unit is partially engaged with the first tooth member and fully engaged with the second tooth member.

5. The lithium electric hammer drill according to claim 4, wherein a ratio of a depth of engagement of the first engagement mode to a depth of engagement of the second engagement mode is not less than 3/2 and not more than 5/2.

6. The lithium electric percussion drill according to claim 3, wherein the first tooth element includes a space for accommodating the spindle and the second tooth element, and a notch communicating with the space, the notch being located outside the space, and the second tooth element includes a second positioning portion that is form-fitted with the notch to restrict a rotational movement of the second tooth element.

7. The lithium electric percussion drill according to claim 3, wherein the second driving unit comprises a second operating member and a second transmission member, the second transmission member abuts against the second tooth element, and the second operating member drives the second tooth element to move axially through the second transmission member;

the second operating part is provided with a second inner surface which is pressed against the second transmission part, the radius of the second inner surface is reduced along the circumferential direction, and the second transmission part moves linearly when the second operating part is rotated to drive the second tooth element to move along the axial direction.

8. The lithium electric percussion drill according to claim 7, wherein the direction of movement of the second transmission member is perpendicular to the axial direction.

9. The lithium electric hammer drill according to claim 7, wherein the first tooth element includes a first detent that is form-fit with the housing to limit rotational movement of the first tooth element;

the second transmission piece is abutted against the front end face of the second tooth element, and the front end face is formed on one side, far away from the first end tooth unit, of the second tooth element.

10. The lithium electric percussion drill according to claim 9, wherein the first positioning portion is provided with a through hole, and the second transmission member passes through the through hole and abuts against a front end surface of the second tooth element.

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