JP2503447B2 - Engine starter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine starter of a system in which a pinion moves along an output shaft and meshes with a ring gear when the engine is started, and particularly, this meshing. In this case, the present invention relates to an engine starter in which a pinion stopper that comes into contact with a pinion to prevent its movement is improved, and more particularly, the structure for attaching the pinion stopper to the output shaft is improved.

[Prior Art] Conventionally, in this type of starter, when the pinion moves along the output shaft and meshes with the ring gear, a cylindrical pinion stopper is provided to abut the pinion and prevent the pinion from moving. .

This pinion stopper is attached so that it can be quickly attached to and detached from the output shaft in order to deal with a failure or repair, and as one example, the one described in Japanese Utility Model Publication No. 57-52382 is known.

According to this publication, while an annular groove is formed on the output shaft, an annular groove is formed on the inner peripheral surface of the pinion stopper, and these two grooves are made to correspond to each other. Then, a pair of arc-shaped half rings are prepared, and the following is done when the pinion stopper is mounted.

That is, while the ring is inserted into the output shaft of the pinion stopper, the ring is positioned in the groove of the output shaft, and by moving the pinion stopper in this state, the ring elastically contracts to fit in the annular groove. There is. Further, when the pinion stopper is removed, the ring is elastically deformed to reduce the diameter by pulling the pinion stopper toward the pinion side, so that the pinion stopper comes out of the annular groove, and the pinion stopper comes out of the output shaft.

[Problems to be Solved by the Invention] As described above, in order to measure the quick attachment / detachment of the pinion stopper, a relatively weak spring-like ring is used. Therefore, the pinion stopper is inserted in the ring insertion direction. It is difficult to move.

Therefore, for example, when attaching the starter to the engine, the pinion stopper inadvertently hits the peripheral parts, and in the belt drive type, if the belt cut due to fatigue or deterioration accidentally hits the pinion stopper, the pinion stopper will be There is an inconvenience that the ring pin moves in the insertion direction and is displaced, and the function of the pinion stopper is lost.

[Object of the Invention] The present invention has been achieved in an effort to eliminate the above problems, and an object of the present invention is to ensure quick attachment / detachment of a pinion stopper in order to deal with repairs, accidents, etc., and the pinion stopper in the direction of the output shaft. It is an object of the present invention to provide a starter having an excellent effect that movement is restricted and the pinion stopper is not inadvertently displaced so that its function is maintained without being impaired.

[Means for Solving Problems] To achieve the above object, the present invention is
In an engine starting device that moves a pinion along an output shaft and meshes with a ring gear on the engine side, a large-diameter portion and a small-diameter portion are continuously formed on an inner peripheral surface, and the large-diameter portion and the small-diameter portion are formed. A cylindrical pinion stopper that is fitted to the output shaft through the small-diameter portion and has a boundary portion as a step portion, and that stops the pinion in an abutting state when the pinion meshes with the ring gear, and the output shaft. An annular groove formed corresponding to the stepped portion, and having an outer dimension of substantially the same diameter as the large diameter portion so as to be located in the large diameter portion of the pinion stopper, and the inner peripheral edge portion is the output A plurality of split rings that are fitted into the groove of the shaft and whose outer peripheral edge portion abuts against the step portion from the side to prevent the pinion stopper from coming off, and are fixedly attached to the pinion stopper, and the pinion stopper is attached to the pinion stopper. On the side Moving the case with the split ring abutting adopted starter having a structure in which a stopper member for movement restriction of the pinion stopper.

[Operation] According to the present invention configured as described above, at the time of mounting, the pinion stopper can be inserted through the output shaft, the split ring can be inserted into the annular groove, and the stopper member can be fitted. It is enough to take out the split ring from the groove together with the member along with the movement of the pinion stopper and pull out the pinion stopper.Moreover, the split ring comes into contact with the stepped portion of the pinion stopper when mounted, and the output shaft of the pinion stopper The stopper member is prevented from coming off, and on the contrary, the stopper member comes into contact with the split ring to restrict the movement of the pinion stopper to the pinion gear side.

EFFECTS OF THE INVENTION According to the present invention, at the time of mounting, the pinion stopper can be inserted into the output shaft, the split ring can be inserted into the annular groove, and the stopper member can be fitted. The split ring must be removed from the groove along with the movement of the stopper, and quick detachment operability is ensured by simply pulling out the pinion stopper, and the split ring must contact the stepped portion of the pinion stopper when mounted. Prevents the pinion stopper from slipping out of the output shaft, and on the contrary, the stopper member abuts the split ring to restrict movement of the pinion stopper toward the pinion gear side, resulting in inadvertent displacement of the pinion stopper. Engine starter that has the excellent effect that its function is maintained. A storage device can be provided.

[Embodiment] A first embodiment of the present invention will be described with reference to FIGS. 1 and 3.

A is a starter of the present invention, and 50 is a ring gear which is usually formed on the outer periphery of a flywheel of an engine. The starter A includes an electric motor 51 and a clutch H that is helically spline fitted to an output shaft (armature shaft) 1 of the electric motor 51.
A sleeve 52, a pinion 3 which is slidably and rotatably fitted on the sleeve 52, and which moves forward together with the sleeve 52 due to inertia when the output shaft 1 is started and engages with the ring gear 50; An axial impact absorbing mechanism (not shown) interposed between the pinion 3 and the pinion 3.

The armature shaft 1 as an output shaft is provided with a helical spline 1a provided on the outer periphery thereof and a helical spline 2a provided on the inner periphery of the clutch outer 2 so as to be movable in the axial direction, and the pinion 3 is integrated with the outer 2. Cage,
The spring 4 is a re-turn spring, and is fixed by a pinion stopper 6 (hereinafter also referred to as a stop collar) and a half ring 5 in a groove 1b of the armature shaft 1 as a stopper member in a groove 6a of the pinion stopper 6. A clip 7 (snap ring) is attached. The pinion stopper 6 has a large-diameter portion 6g and a small-diameter portion 6h continuously formed on the inner peripheral surface thereof.
The boundary part of is defined as a step 6i. The half ring 5 as a split ring is as shown in FIG. 2, and has an outer shape D1 <an inner diameter D2 of the large diameter portion 6g of the stop collar> an armature shaft 1.
The diameter of the groove 1b of the stop collar 6 is set on the shaft 1 (the clutch outer 2 and the return spring 4 are attached first) at this time, and the end surface 6b of the stop collar 6 is set. Moves to the clutch H side from the groove 1b of the shaft 1, puts the half ring 5 into the groove 1b of the shaft 1, moves the stop collar 6 in the direction opposite to the clutch H, and contacts the step 6i. Then, the movement toward the pinion 3 direction is blocked. Then, the snap ring 7 is attached to the groove 6a of the stop collar 6 for completion. To remove it, reverse the above procedure. At this time, when the dimensions L and M in FIG. 1 are expressed using symbols of higher mathematics, the size relation of dimension L> dimension M (read as L greater than M) is established, and the dimension L is a stop collar. 6 shows the distance between the end face 6c opposite the end face 6b and the pinion 3, while the dimension M shows the distance between the end face 6b of the stop collar 6 and the half ring 5. If these dimensional relationships do not have the above relationship, it is known that there is a danger that the operation of attaching and detaching the stop collar 6 will be difficult anymore. Therefore, as described above, the dimension L,
Since the dimension L> the dimension M is set to M, good attachment / detachment control can be sufficiently ensured. In addition, 9 is a screw hole and 10 is a mounting bolt.

Further, not only the snap ring 7 shown in FIG. 3 but also the change of its shape enables the shape change as shown in FIGS. 4 and 5 as another embodiment of the present invention. .

Further, in the above-mentioned embodiment, the invention is applied to the bendex type so-called inertia jump type starter, but it goes without saying that it may be applied to a type using an electromagnetic solenoid.

In addition, the half ring 5 in the above-described embodiment may of course have a half ring shape having an elliptical cross section, and various modifications may be made to the half ring shape. Needless to say.

As for the snap ring 7, various mechanical element members such as a retainer ring can be considered. The point is that a snap ring is used so that it is difficult for the pinion stopper 6 to come off when an external force is applied to the pinion stopper 6. However, if the magnitude of the force is known, a shape that resists this can be used.

Further, in the above-described embodiment, the bolt 10 and the screw hole 9 are used for attachment, but it goes without saying that the configuration is not limited to this.

In addition, it goes without saying that various changes can be made in the specific implementation without departing from the spirit of the invention.

[Brief description of drawings]

1 is a sectional view showing a first embodiment of an engine starting device of the present invention, FIG. 2 is a front view of a half ring for explaining the operation of the first embodiment, and FIG. 3 is a front view of a snap ring. , 4th
FIG. 5 and FIG. 5 show a modification of the snap ring of another embodiment. In the figure, 1 ... Shaft (output shaft), 1b ... Groove, 3 ... Pinion, 4 ... Return spring (Spring), 5 ... Half ring, 6 ... Stop collar (Pinion stopper), 7 ...
Snap ring (circlip), 51 ... electric motor, 52 ... sleeve

Claims (1)

(57) [Claims] 1. An engine starter for moving a pinion along an output shaft to mesh with a ring gear on the engine side when the engine is started, wherein a large diameter portion and a small diameter portion are continuously formed on an inner peripheral surface, A boundary portion between the large diameter portion and the small diameter portion is a step portion, which is fitted to the output shaft via the small diameter portion and stops the pinion in an abutting state when the pinion meshes with the ring gear. A cylindrical pinion stopper, an annular groove formed on the output shaft so as to correspond to the position where the step exists, and a pinion stopper having substantially the same diameter as the large diameter portion so as to be located inside the large diameter portion. A plurality of split rings having outer dimensions, the inner peripheral edge portion of which is fitted into the groove of the output shaft, and the outer peripheral edge portion of the pinion stopper comes into contact with the step portion from the side, and Attached to the pinion stopper side And a stopper member that restricts the movement of the pinion stopper by coming into contact with the split ring when the pinion stopper moves to the pinion side.