JPS60184965A - Starter - Google Patents

Abstract

PURPOSE:To enable impactless start of an engine by joining a sleeve member engaged with the external periphery of a drive shaft via a straight spline, with a one-way clutch via a helical spline and having a resilient member bear a thrust force applied to the sleeve member. CONSTITUTION:When a magnet switch 16 is electrified and a lever 19 is moved, a pinion 2a is pushed forth by the lever 19 via a one-way clutch 2. And before abutment of the pinion 2a with a ring gear 7, a magnet switch 16 is opened and a starter motor 15 is then driven to turn an armature shaft 9. The turning of the shaft 9 revolves a drive shaft 3 via planetary gear reduction mechanism (4, 9a and 11). The pinion 2a is turned by the revolution of the drive shaft 3 via a sleeve member 1 joined with both the shaft 3 and a clutch outer 2d via straight spline and helical spline, which are formed on the outside and the inside face thereof, and at the same time, engaged with a ring gear 17. The impact produced at the engagement time is absorbed by a resilient member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter that absorbs the impact when a pinion meshes with a ring gear and starts an internal combustion engine.

[Prior art]

As shown in Japanese Utility Model Application Publication No. 58-136676, the conventional one has a groove provided in at least one of the front end of the armature shaft or the rear end of the drive shaft facing the armature shaft, and an elastic body and an elastic body are provided in the groove. This contains a steel ball for receiving the thrust load.

However, in the conventional device described above, an elastic body and a steel ball for receiving thrust load pressure are housed in the joint between the drive shaft and the armature shaft, so the pinion is connected to the ring gear on the engine side. When the rotation is abruptly stopped due to collision with the armature, the impact force in the thrust direction can be alleviated, but the impact force in the rotation direction cannot be alleviated, and has the disadvantage that it is directly transmitted to the armature shaft.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks, the present invention connects a cylindrical member that is directly spline-coupled to the outer periphery of a drive shaft to a one-way clutch and has a torsion spline connection between the end surface of the cylindrical member and a protrusion provided on the drive shaft. By installing the elastic member, when the pinion collides with the ring gear and suddenly stops rotating, the cylinder member moves in the opposite direction to the extrusion direction due to the impact force in the rotation direction, and the disconnection member is bent. Since the drive shaft can rotate by the amount of deflection of the elastic member, the purpose is to absorb impact forces in the thrust direction and rotational direction as well.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In the first embodiment shown in FIGS. 1 and 2, a starter motor 15 connected to a magnetic switch 16
A sun gear 9a is formed on the outer periphery of the armature shaft 9. The planetary gear 4 that meshes with this sun gear 9a is
It is rotatably fixed by a pin 5. The pin 5 is fixed to a ring 6, which is a projection formed in the radial direction of a drive shaft 3, which is rotatably disposed on the same axis -F as the armature 9 via a bearing. The ring 6 is fixed to the end of the starter motor 15 of the drive shaft 3, and may be integral with the drive shaft 3 or separate therefrom. The planetary gear 4 also meshes with an internal gear 11 fixed to a housing 18 of the starter. The intermediate bracket lla of the internal gear 11 holds the end of the armature shaft 9 on the drive shaft 3 side via a bearing. In addition, sun gear 9a, planet gear 4,
The internal gear 11 constitutes a planetary gear reduction mechanism. A pinion 2a is connected to the outer periphery of the drive shaft 3 via a unidirectional clutch 2 composed of a clutch outer 2d having a spline tube 2e with a twisted spline 2C formed on the inner periphery, a rotor 2d, and an inner 2f.
are connected.

Further, as shown in FIG. 2, a torsion spline is provided on the outer periphery so as to mesh between the straight spline 3b formed on the outer periphery of the ratio drive shaft 3 and the torsion spline 2C formed on the inner periphery of the clutch outer 2d. 1a and a cylindrical member 1 having a straight spline 1b formed on its inner periphery is attached. And the starter motor 15 of this cylindrical member l
On the outer periphery of the drive shaft 3 between the side end face and the ring 6,
An annular elastic member 7 (for example, a rubber member or the like) is attached. Further, a straight spline 3b of the drive shaft 3 is arranged so as to come into contact with a straight helical 1b on the inner circumference of the cylindrical member 1.
A stepped portion 3a is provided on the end face of the cylinder member 1, and the stepped portion 3a restricts the cylindrical member 1 from moving toward the pinion 2a. Further, 17 is a ring gear, 8 is a stopper for stopping the forward movement of the pinion 2a, which is fixed to the outer periphery of the end surface of the drive shaft 3, and 19 is a lever that connects the magnet switch 16 and the clutch outer 2d.

Next, the operation of the above configuration will be explained.

When the magnetic switch 16 is energized and the lever 19 is moved, the pinion 2a is pushed out via the one-way clutch 2. Before the pinion 2a comes into contact with the ring gear 17, the contacts of the magnetic switch 16 are closed, driving the starter motor 15 and rotating the armature shaft 9. Further, this rotation of the armature shaft 9 is applied to the drive shaft 3 via a planetary gear reduction mechanism.

Next, rotation of the drive shaft 3 is applied to the one-way clutch and pinion 2a through the cylindrical member 1 splined between the outer circumference of the drive shaft 3 and the inner circumference of the clutch outer 2d, and the pinion 2a is rotated. Rotate.

When the pinion 2a and the ring gear 17 collide and the pinion 2a is suddenly locked, the clutch outer 2
The inner periphery of and the outer periphery of the cylindrical member l are connected by a torsion spline,
Since the outer periphery of the drive shaft 3 and the inner periphery of the cylindrical member 1 are connected by a straight spline, the cylindrical member 1
moves backward while bending the elastic member 7. At this time, it absorbs the impact in the axial direction. Further, the cylindrical member 1 is rotated in the same direction as the rotation of the drive shaft 3 due to the torsional spline action between the spline tube 2e and the cylindrical member 1, and is retreated toward the starter motor 15 side. At this time, impact in the direction of rotation can be absorbed. Therefore, stress concentration at the meshing portion between the planetary gear 4 and the internal gear 11 or between the planetary gear 4 and the sun gear 9a can be prevented.

In the first embodiment described above, the stopper 8 is used to prevent the pinion 2a from moving forward, but as shown in the second embodiment of FIG. The stepped portion 3a is attached to the pinion 2 so that it can be installed.
Extend in the axial direction on the a side. Then, the torsion spline 2C formed on the inner circumference of the clutch outer 2d is extended toward the drive shaft 3 side. Furthermore, the stepped portion 3a is deepened in the inner circumferential direction so that the torsion spline 2C can be received, and the pinion 2C is received by the end surface of the stepped portion 3a on the pinion 2a side.
The movement of a may be restricted.

Further, as shown in the third embodiment of FIG. 4, a bent portion (or a step formed by cutting up the torsion spline 1a) in which the end surface of the cylindrical member 1 on the pinion 2a side is bent in the outer circumferential direction
lc is provided, and the movement of the torsion spline 2C formed on the inner circumference of the clutch outer 2d is restricted by the bent portion IC,
The bent portion lc may be used as a stopper for the pinion 2a.

By adopting the configuration shown in the second embodiment and the third embodiment, the stopper 8 can be eliminated.
The total length of the starter can be shortened. Furthermore, in the second and third embodiments, the elastic member 7 is extended in the outer circumferential direction between the end surface of the clutch outer 2d and the ring 6, so when the magnetic switch 16 is turned off, the one-way clutch 2 returns to its original state. The impact caused by the return to normal position can also be absorbed by the elastic deformation of the elastic member 70.

Further, in the first to third embodiments, the intermediate placket lla integrated with the internal gear 11 holds the armature shaft 9, but as shown in the fourth embodiment shown in FIGS. , the intermediate bracket lla of the internal gear 11 may hold the end of the nine armature shafts of the drive shaft 3. moreover,
In the fourth embodiment, a spring 7a is installed between the end surface of the cylindrical member 1 and the protrusion 3C of the drive shaft 3 instead of the elastic member 7 made of rubber or the like. In order to restrict the movement of the cylindrical member 1 toward the pinion 2a, there is a stopper IO fixed on the drive shaft 3 on the end surface of the cylindrical member 1 on the pinion 2a side.

Furthermore, although the embodiment of the present invention uses the electromagnetic force of a magnet switch to move the pinion, the present invention may also be applied to an inertial mesh starter.

Next, in the embodiment of the present invention, the speed reduction mechanism includes a planetary gear, but the present invention may be applied to a starter equipped with other speed reduction mechanisms.

Furthermore, the present invention may be used in a starter in which the armature shaft serves as a drive shaft without having a speed reduction mechanism.

〔Effect of the invention〕

As described above, the present invention includes an armature of a starter motor, a drive shaft to which the rotational force of the armature is transmitted and which has a protrusion on the armature side, and a cylindrical member connected to the outer periphery of the drive shaft by a straight spline. ．． The unidirectional clutch is twisted and spline-coupled to the outer periphery of the cylindrical member, an elastic member is mounted between the cylindrical member and the protrusion of the drive shaft, and a pinion is connected to the clutch on the drive shaft. The pinion collides with the ring gear on the engine side,
When it is suddenly hit, the cylindrical member retreats toward the starter motor due to the collision force in the rotational direction, bends the elastic member, absorbs the impact in the axial direction, and Since the cylindrical member and the one-way clutch are spline-coupled, the drive shaft can rotate, absorbing impact in the rotational direction, and absorbing impact in the rotational and thrust directions.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing a first embodiment of the device of the present invention, FIG. 2 is a half sectional view of a cylindrical member in the first embodiment, and FIG.
The figure is a half-sectional view showing the main part of the second embodiment of the device of the present invention, and FIG. 4 is the half-sectional view showing the main part of the third embodiment of the device of the present invention.
FIG. 5 is a partially sectional front view showing a fourth embodiment of the device of the present invention, and FIG. 6 is a longitudinal sectional view showing the configuration of a cylindrical member portion in the fourth embodiment. DESCRIPTION OF SYMBOLS 1... Cylindrical member, 1a... Twisted spline formed on the outer periphery of the cylindrical member, 1b... Straight spline formed on the inner periphery of the cylindrical member, 2... One-way clutch, 2a... Pinion , 2c... Twisted spline of one-way clutch, 2d... Clutch outer, 3... Drive shaft, 3b... Straight spline of drive shaft, 7
. . . elastic member, 7a . . . spring forming the elastic member, 9 . . . armature shaft, 15 . . . starter motor. Representative Patent Attorney Takashi Okabe Figure 3 Figure 4

Claims (1)

[Claims] An armature of a starter motor, a drive shaft to which the rotational force of the armature is transmitted and which has a protrusion on the armature side, a cylindrical member connected to the outer periphery of the drive shaft by a straight spline, and a cylindrical member connected to the outer periphery of the cylindrical member by a twisted spline. A starter comprising: a one-way clutch; an elastic member installed between the cylindrical member and the protrusion of the drive shaft; and a pinion connected to the clutch at the drive shaft.