CN1073209C - Engine starter - Google Patents

Abstract

The present invention relates to an engine starter, wherein a bulge is arranged on a front outer shell or a yoke. In addition, the front outer shell or the yoke is provided with a matching part wedged with the bulge to prevent the yoke from rotating. Thus, shearing force is prevented from destroying a long screw bolt, and the destroying frequently occurs in the past with respect to the state that the yoke is fixed on the front outer shell.

Description

Translated fromChinese

发动机起动机engine starter

本发明涉及一种发动机起动机，用于汽车发动机或其类似的机器上。The present invention relates to an engine starter for automobile engines or similar machines.

图7是一传统的行星减速发动机起动机的截面图，例如在日本专利公布号第5-28380中所揭示的那种。图中，电枢1有轴2，其上有电枢齿轮2a，一电枢芯3固定在轴2上，和电枢线圈固定在电枢芯3上。固定在围绕电枢1的圆柱形轭架5内周表面上的是磁块5，它面对着电枢1的外周表面。电动机7带有电枢1，轭架和磁块6。此外，图8是图7的轭架5的截面图。轭架5的底部有一孔，用于容纳电枢1的轴2于其中。Fig. 7 is a sectional view of a conventional planetary reduction engine starter such as that disclosed in Japanese Patent Publication No. 5-28380. In the figure, an armature 1 has ashaft 2, on which an armature gear 2a is arranged, anarmature core 3 is fixed on theshaft 2, and an armature coil is fixed on thearmature core 3. Fixed on the inner peripheral surface of acylindrical yoke 5 surrounding the armature 1 is amagnet 5 facing the outer peripheral surface of the armature 1 . Themotor 7 has an armature 1, a yoke and amagnet 6. In addition, FIG. 8 is a cross-sectional view of theyoke 5 of FIG. 7 . The bottom of theyoke 5 has a hole for receiving theshaft 2 of the armature 1 therein.

电机7通过一行星减速机构8与输出轴9相连结。所设置的过速离合器10和小齿轮11能在输出轴9上往复运动，从而与发动机的齿圈(未示出)相啮合。过速离合器10以杠杆12与电磁开关13的可动铁芯相连结。Themotor 7 is connected with an output shaft 9 through aplanetary reduction mechanism 8 . An overrunning clutch 10 and a pinion gear 11 are provided to reciprocate on the output shaft 9 so as to mesh with a ring gear (not shown) of the engine. The overrunning clutch 10 is connected with the movable iron core of the electromagnetic switch 13 with the lever 12 .

轭架5和电磁开关13固定在前外壳15上。行星减速机构8、输出轴9、过速离合器10、小齿轮11和杠杆12设置在前外壳15内。后外壳16固定到轭架5的后端(在图中左端)。此外，轭架5是用长螺栓17固定到前外壳15上的。Theyoke 5 and the electromagnetic switch 13 are fixed on the front housing 15 . Theplanetary reduction mechanism 8 , the output shaft 9 , the overrunning clutch 10 , the pinion gear 11 and the lever 12 are provided in the front housing 15 . A rear housing 16 is fixed to the rear end (left end in the drawing) of theyoke 5 . In addition, theyoke 5 is fixed to the front housing 15 with long bolts 17 .

下面描述工作过程。当电磁开关转至接通档时，活动铁芯14朝图中左方移动，使电流进入电机7。与活动铁芯机械连结的杠杆12摆动并使过速离合器10和小齿轮11沿输出轴9朝图中右方向滑动。这样，小齿轮11便与发动机齿圈相啮合。The working process is described below. When the electromagnetic switch is forwarded to the gear, the movable iron core 14 moves to the left in the figure, so that the electric current enters themotor 7 . The lever 12 mechanically linked with the movable iron core swings and makes the overrunning clutch 10 and the pinion 11 slide along the output shaft 9 to the right in the figure. Thus, the pinion 11 meshes with the engine ring gear.

电动机7的转动通过行星减速器8、输出轴9和过速离合器10传递到小齿轮11上，从而起动发动机。当发动机起动后，电磁开关13转至断开档时，活动铁芯14移动回到其原始位置而流向电机7的电流被切断。此外，通过杠杆12过速离合器10也移回其最初位置，同时小齿轮11与齿圈分开。The rotation of theelectric motor 7 is transmitted to the pinion 11 through theplanetary reducer 8, the output shaft 9 and the overrunning clutch 10, thereby starting the engine. After the engine is started, when the electromagnetic switch 13 is forwarded to the disengagement gear, the movable iron core 14 moves back to its original position and the electric current flowing to themotor 7 is cut off. Furthermore, via the lever 12 the overrunning clutch 10 is also moved back to its original position, while the pinion 11 is separated from the ring gear.

对于带有上述结构的传统的发动机起动机，轭架5只是通过长螺栓17固定到前外壳15上的，因此发动机的振动会引起轭架5朝转动方向活动而同时长螺栓17会歪斜。轭架5的转动运动在周围情况允许时会使长螺栓17断裂。With the conventional engine starter with the above structure, theyoke 5 is fixed to the front housing 15 only by the long bolts 17, so the vibration of the engine will cause theyoke 5 to move in the direction of rotation while the long bolts 17 will be skewed. The rotational movement of theyoke 5 will break the long bolt 17 if the surrounding conditions permit.

因此，本发明的一个目的是提供一种发动机起动机，它能避免轭架的转动运动和用来把轭架固定到前外壳上的长螺栓的破坏。SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an engine starter which avoids rotational movement of the yoke and damage to the long bolts used to secure the yoke to the front housing.

为达到上述目的，提供一种发动机起动机，它包括：一前外壳；一电动机，它包括用长螺栓固定到前外壳上的圆柱形轭架，固定在轭架内周表面上的磁块，以及设置于轭架内的电枢；设置在前外壳内并且当电动机的转动力被传递过来时转动的一输出轴；一个小齿轮，它能与发动机的齿圈啮合和脱离啮合并且在输出轴转动时转动；以及一电磁开关，用于使小齿轮与齿圈啮合和脱离啮合也能使电动机通电和断电；其特征在于，前外壳和轭架之一带有凸起，另外的前外壳和轭架有相配合的部分与上述凸起啮合，从而防止上述轭架相对前述外壳的转动运动。In order to achieve the above object, a kind of engine starter is provided, and it comprises: a front casing; An electric motor, it comprises the cylindrical yoke frame that is fixed on the front casing with long bolt, is fixed on the magnetic block on the yoke frame inner peripheral surface, and an armature disposed in the yoke; an output shaft disposed in the front housing and rotated when the rotational force of the electric motor is transmitted; a pinion gear capable of meshing and disengaging with the ring gear of the engine and on the output shaft and an electromagnetic switch for engaging and disengaging the pinion with the ring gear and also for energizing and de-energizing the motor; characterized in that one of the front housing and the yoke has a protrusion, and the other front housing and A cooperating portion of the yoke engages the protrusion to prevent rotational movement of the yoke relative to the housing.

图1是作为本发明的第一实施例的发动机起动机的局部截面视图；1 is a partial sectional view of an engine starter as a first embodiment of the present invention;

图2是图1中轭架的截面视图；Fig. 2 is a sectional view of the yoke in Fig. 1;

图3是图2的轭架的正视图；Figure 3 is a front view of the yoke of Figure 2;

图4是沿图1中Ⅳ-Ⅳ线的前外壳的横截面视图；Fig. 4 is a cross-sectional view of the front housing along line IV-IV in Fig. 1;

图5是作为本发明的第二实施例的发动机起动机的轭架的正视图；5 is a front view of a yoke of an engine starter as a second embodiment of the present invention;

图6是第二实施例的前外壳的局部横截面视图；Figure 6 is a partial cross-sectional view of the front housing of the second embodiment;

图7是一种传统的发动机起动机的一个实例的截面视图；Fig. 7 is a sectional view of an example of a conventional engine starter;

图8是图7中的轭架的截面图。FIG. 8 is a cross-sectional view of the yoke in FIG. 7 .

图1是作为本发明的第一实施例的发动机起动机的局部截面视图。图2是图1的轭架的截面视图。图3是图2的轭架的正视图。图4是沿图1中Ⅳ-Ⅳ线的前外壳的横截面视图。Fig. 1 is a partial sectional view of an engine starter as a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the yoke of FIG. 1 . FIG. 3 is a front view of the yoke of FIG. 2 . Fig. 4 is a cross-sectional view of the front housing taken along line IV-IV in Fig. 1 .

在这些图中，圆柱形轭架21有一凸起21a，以冲压的方法在前外壳22侧边，即底部的端边处加工而成。由金属制做的前外壳22有一凹槽22a用以插入凸起21a。凸起21a与凹槽22a的两侧壁相配合，它们是配合部分22b、 22c。构成发动机起动机的主要元件与图7中的几乎一样。In these figures, acylindrical yoke 21 has aprojection 21a formed by punching at the side of thefront housing 22, that is, at the end of the bottom. Thefront case 22 made of metal has a recess 22a for inserting theprojection 21a. Theprotrusion 21a cooperates with the two side walls of the groove 22a, which are the engaging portions 22b, 22c. The main elements constituting the engine starter are almost the same as those in Fig. 7.

在这种发动机起动机中，由于轭架21的突起21a与前外壳22的配合部分22b、22c相配合，防止了轭架21的转动运动并且精确地定位轭架21。由于朝转动方向的力是从凸起21a传递到配合部分22b、22c，避免了剪切力破坏长螺栓17(图7)。另外，凸起21a由轭架21的一部分冲压形成，避免了零件数量的增加，并且定位轭架21的费用降低了。In this engine starter, since theprotrusion 21a of theyoke 21 is engaged with the fitting portions 22b, 22c of thefront case 22, the rotational movement of theyoke 21 is prevented and theyoke 21 is accurately positioned. Since the force in the direction of rotation is transmitted from theprotrusion 21a to the fitting portions 22b, 22c, damage to the long bolt 17 by shearing force is avoided (FIG. 7). In addition, theprojection 21a is formed by stamping a part of theyoke 21, avoiding an increase in the number of parts and reducing the cost for positioning theyoke 21.

在上述第一实施例中虽然提供了一个凸起21a，但也能提供两个凸起21a，如图5所示。图6是表示在此第二实施例中配合部分22b、22c的设置情况的截面视图。Although oneprotrusion 21a is provided in the first embodiment described above, twoprotrusions 21a can also be provided, as shown in FIG. 5 . Fig. 6 is a sectional view showing the arrangement of the fitting portions 22b, 22c in this second embodiment.

此外，凸起21a可以设置在轭架21外周的任何地方，并且在轭架21上多于三处的地方。In addition, theprotrusions 21a may be provided anywhere on the outer circumference of theyoke 21, and at more than three places on theyoke 21. As shown in FIG.

还有，虽然凸起21a设置在轭架21上，配合部分22b、22c设置在前外壳22上，但可以把凸起设置在前外壳上而把配合部分设置在轭架上。Also, although theprojection 21a is provided on theyoke 21 and the fitting portions 22b, 22c are provided on thefront case 22, the projections may be provided on the front case and the fitting portions are provided on the yoke.

再者，虽然上述实施例是就行星减速发动机起动机而言的，但本发明也可以应用到各种类型的发动机起动机上。Furthermore, although the above-mentioned embodiments are concerned with planetary reduction engine starters, the present invention can also be applied to various types of engine starters.

Claims (4)

1. engine starter comprises:

One front casing;

One motor comprises with stay bolt being fixed on cylindrical york piece on the above-mentioned front casing, is fixed on a magnetic patch on the perimeter surface and an armature that makes in above-mentioned york piece in the above-mentioned york piece;

One output shaft is arranged in the above-mentioned front casing and when the driving force of motor passes over and rotates;

One small gear, it can mesh with the gear ring engagement and the disengaging of motor, and rotates when above-mentioned output shaft rotates; With

One magnetic switch is used to make the engagement of above-mentioned small gear and above-mentioned gear ring and breaks away from engagement, and also can make above-mentioned motor energising and outage;

It is characterized in that one of above-mentioned front casing and above-mentioned york piece have a projection, and one of other have mating part, this mating part is meshed with above-mentioned projection in order to prevent above-mentioned york piece relatively rotating above-mentioned front casing.

2. according to a kind of engine starter of claim 1, it is characterized in that above-mentioned cylindrical york piece has a bottom, it has a hole, and the axle that is used to hold above-mentioned armature is in it, and above-mentioned projection forms in above-mentioned bottom with process for stamping.

3. according to a kind of engine starter of claim 2, it is characterized in that above-mentioned york piece has a plurality of above-mentioned projectioies.

4. according to a kind of engine starter of claim 1, it is characterized in that the above-mentioned driving force of above-mentioned motor is delivered on the above-mentioned small gear by a planet reducing gear, above-mentioned output shaft and an overrunning clutch.

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