JPH01247762A - Starter with planetary gear decelerator - Google Patents

Abstract

PURPOSE:To lower rapidly the inertia rotation of an armature by pressing the armature by means of a cylinder member, by inserting the cylinder member into a hollow portion formed at an output rotary shaft and holding pinchingly this cylinder member by means of a pinion and an armature shaft. CONSTITUTION:At a starter, the armature shaft 7 of a motor 1 and an output rotary shaft 14 are arranged on the same axis, and at the same time, these are meshed with each other through a sun gear 12 and a planetary gear 23. And both end portions of the output rotary shaft 14 are shaft-supported respectively through a plurality of bearings 13, 16 and a pinion 17 or the like. In this instance, the output rotary shaft 14 is formed into a hollow structure and at the same time, a cylinder member 31 is inserted into this hollow portion 30. And the outer end portion of the cylinder member 31 is held pinchingly with the armature shaft 7 and a cap 33 fixed at the tip portion of the pinion 17. As a result, the inertia rotation of an armature is rapidly lowered by pressing the armature 6 on the side of a rear bracket 8 by means of the cylinder member 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter with a planetary reducer, and more particularly to a starter with a planetary reducer having a brake mechanism suitable for shortening inertia rotation time.

[Conventional technology]

In the conventional device, as described in Utility Model Application No. 58-70060, the armature only has a thrust and is supported at both ends, and is not structured to shorten the inertial rotation time after the switch is disconnected. Ta.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into consideration the point of shortening the inertia rotation time, and there is a problem that the starter receives an excessive shock when the starter is re-engaged with the engine ring gear while the starter is inertia rotation after the engine fails to start. Ta.

An object of the present invention is to shorten the inert rotation time so that even when the starter is re-engaged during inert rotation, it does not receive excessive impact.

[Means to solve the problem]

The above purpose is to construct a planetary reducer in which the output rotating shaft, in which a pinion equipped with an overrunning clutch is threadedly engaged with a helical spline provided on the outer diameter part, has a hollow structure, and a cylindrical member is inserted into this hollow part. This is achieved by being held between the pinion and the armature shaft.

[Effect]

The pinion, which has an overrunning clutch that pops out when the switch is turned off and whose outer end is sealed, is the shift lever.
The cylindrical member is returned by the pinion whose outer end is sealed, and the cylindrical member is held between the pinion whose outer end is sealed and the tip of the armature shaft.

This pushes the armature toward the rear bracket,
The rotation of the rear armature with zero gap between the washer and the armature shirt 1 can be quickly reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1.A starter according to the present invention will be described in FIG.

] is a motor, and 2 is a switch. A magnet 4 is attached to the inner circumference of a cylindrical yoke 3 of the motor 1, and a thin plate 5 is attached to the inner circumference of the magnet 4. Further, an armature 6 is arranged on the inner peripheral side of the thin plate 5, and an armature shaft 7 is provided in the center. One end of the armature shirt l-7 is rotatably supported by a rear bracket 8. Armature thrust is ensured by the rear bracket 8, the washer 10 held by the brush holder 9 fixed to the rear bracket 8, and the groove 11 of the armature shirt I-7. Further, a sun gear 12 is formed on the outer periphery of the other end of the armature shaft 7. An output rotating shaft 14 is disposed coaxially with the armature shaft 7 via a bearing 13 . A disc-shaped protrusion 15 is formed on one end of the output rotation shaft 14, which is the motor side, and protrudes in the outer radial direction. has been done. Further, through holes 2o are formed at equal intervals in the protrusion 15, and a shaft 21 is press-fitted into the through holes 20, and a planetary gear 23 is rotatably held on the shaft 21 via a bearing 22. has been done.

This planetary gear 23 meshes with the outer periphery of the sun gear 12. Further, the planetary gear 23 meshes with an internal gear 27 which is held between a disk 24 and a center bracket 25 via a rubber cover 26. Further, the internal gear 27 meshes with a gear portion 28 formed on the center bracket 25 to prevent rotation in the circumferential direction. A disk 24 is disposed between the internal gear 27 and the yoke 3 via a rubber cover 26, and this disk 24 restricts the movement of the planetary gear 23 in the axial direction and prevents it from being pulled out from the shaft 21. It is prevented. Further, the output rotating shaft 14 is rotatably supported by the center bracket 25 via a bearing 29 . Furthermore, the output rotation shaft 14
A cylindrical member 31 is pivotally supported in the hollow portion 30 by bearings 32a and 32b, and is held between a cap 33 fixed to the tip of the pinion 17 and the armature shaft 7. An overrunning clutch 34 is helically spline coupled to the helical spline 14a of the output rotating shaft 14, and a pinion 17 is connected to the overrunning clutch 34.

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

The switch 2 is attached to the front bracket 19, and when current flows through the switch 2, an electromagnetic force is generated, which causes the pinion 17 to pop out via the plunger 35, torsion spring 36, and shift lever 37, and is inserted into the engine (not shown). It meshes with the directly connected ring gear 38. At the same time, a large current flows through armature 6, causing this armature 6 to
The rotation of the armature shaft 7 is transmitted to the planetary gear 23 via the sun gear 12 of the armature shaft 7. Therefore, armature shaft 7
The planetary gear 23 meshing between the sun gear 12 and the internal gear 27 decelerates the rotation and transmits it to the output rotating shaft 14. The decelerated rotation is then transmitted to the pinion 17 via the overrunning clutch 34, the rotation of the pinion 17 is transmitted to the ring gear 38, and the engine (not shown) is started.

According to this embodiment, since the cylindrical member 31 is inserted into the hollow part 30 of the output rotating shaft 14, when the pinion 17 returns after starting the engine, the cylindrical member 31 is pushed by the cap 33 fixed to the tip of the pinion 17. When the pinion 17 returns to a resting state, the cylindrical member 31 is held between the cap 33 and the armature shaft 7.

Therefore, the armature 6 is pressed against the rear bracket 8 side by the cylindrical member 32, the armature thrust becomes zero, and the rotation of the armature 6 can be quickly reduced. Furthermore, since the rotation of the armature 6 can be quickly reduced, noise can also be reduced. Further, in the stationary state, the armature 6 is pressed against the rear bracket 8 side, so even when the starter receives vibration, the armature 6 does not move, and damage to the armature 6 due to vibration can be prevented. Furthermore, according to the other embodiment shown in FIG. 2, the contact surface between the armature 6 and the rear bracket 8 is increased, so that the rotation of the armature 6 can be more effectively reduced quickly.

〔Effect of the invention〕

According to the present invention, the output rotating shaft has a hollow structure, a cylindrical member is inserted into the hollow part, and the armature is clamped by the pinion and the armature shaft, so that the armature is pressed against the rear bracket side and the starter is rotated by inertia. This has the effect of shortening the inertia rotation time to avoid receiving excessive shock even when re-meshing.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of one embodiment of the present invention, FIG. 2 is a partial vertical cross-sectional view of another embodiment of the present invention, and FIGS. 3 and 4 are main views of another embodiment of the present invention. It is a partial vertical cross-sectional view. 7... Armature shaft, 12... Sun gear, 1
4... Output rotating shaft, 17... Pinion, 23...
Planetary gear, 27...Internal gear, 30...Hollow part, 31...Figure 1, Figure 2, Figure 3, Figure 4" + 30

Claims (1)

[Scope of Claims] 1. An armature shaft of a motor, an output rotating shaft having a flat plate portion disposed coaxially with the armature shaft and protruding in the radial direction on the motor side, and an outer periphery of the end of the armature shaft. a planetary gear reduction mechanism having a sun gear formed in a cylindrical shape, a planetary gear meshing with the sun gear and rotatably provided on a flat plate portion of the output rotating shaft, and an internal gear meshing with the outer periphery of the planetary gear; A hollow cylindrical member having an overrunning clutch coupled with a helical spline on the outer periphery, a pinion whose outer end is sealed and coupled to the tip of this cylindrical member, a bearing that supports the hollow cylindrical member, and a front bracket that holds this bearing. In the starter with a planetary gear reducer, the output rotating shaft has a hollow structure, and the cylindrical member is held between a pinion that is inserted into the hollow part into a cylindrical member and whose outer end is sealed, and a tip end of the armature shaft. A starter with a featured planetary gear reducer. 2. A starter with a planetary gear reducer according to claim 1, characterized in that the hollow cylindrical member and the pinion whose outer end is sealed are integrated into one body.