JPH0443862A - Starter equipped with speed reduction mechanism - Google Patents

Abstract

PURPOSE:To miniaturize a pinion clutch excellent at its interlocking property so as to enhance mechanical strength by disposing between the end portion of a pinion and a pinion shaft a cushion spring which applies a pre-load to the pinion in the axial direction so as to securely hold the pinion. CONSTITUTION:A first helical spline 13 and a second helical spline 14 on a shaft 12 are continuously disposed and a cushion spring 16 for fixing a pinion 15 on the second helical spline 14 and a spring bearing 19 are disposed in front of the pinion 15 and the second helical spline 14, respectively. Thereby spaces behind the pinion 15 and the second helical spline 14 and the step of a shaft narrow portion can both be abolished so as to secure mechanical strength and shorten the length of the axis of a pinion clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter pinion engagement mechanism, and particularly to a structure suitable for a pinion clutch with excellent engagement reliability.

[Conventional technology]

As a conventional technique, as shown in a known example, there is a space between the first helical spline and the second helical spline for engaging with a cushion spring or a spline that can fix the pinion on the shaft. was taken in large numbers.

[Problem to be solved by the invention]

In the above conventional technology, the space for housing the cushion spring is
There is a large space behind the pinion and the second helical spline, or there is a large space behind the pinion and the second helical spline to assemble the spline that can fix the pinion on the second helical spline. Therefore, there was a problem in that the pinion clutch had to be large in order to ensure the mechanical strength of each part of the pinion clutch.

The purpose of the present invention is as follows. The object of the present invention is to achieve both mechanical strength and miniaturization of a pinion clutch having an excellent engagement property and having a second helical spline.

Means for Solving Problem C11] In order to achieve the above object, the first helical spline and the second helical spline on the shaft are arranged continuously, and the pinion is fixed on the second helical spline. By arranging the cushion spring and spring receiver in front of the pinion and the second helical spline, it is possible to eliminate the space behind the pinion and the second helical spline and the level difference in the shaft detail, ensuring mechanical strength and improving the pinion clutch. This is a shortened version of the axial length.

[Effect]

By continuously arranging the first helical spline and the second helical spline on the shaft, the shaft detail and its notch can be eliminated. In addition, by arranging a cushion spring and a spring receiver for fixing the pinion in the axial direction in front of the pinion and the second helical spline,
The pinion and second helical spline can be placed as close to the clutch side as possible. This allows the shaft axial length to be shortened, so the pinion clutch portion can be downsized. Furthermore, the mechanical strength of the pinion clutch section can be improved by reducing the bending moment through miniaturization and by eliminating the shaft detail and its notch.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

] is the shaft of the motor, and an archure gear 2 is provided at one end. 3 is a clutch outer of the clutch, and a clutch gear 4 is provided on the outer periphery. The armature gear 2 and clutch gear 4 constitute a reduction gear.

5 is a rotor, and 6 is a clutch inner, both ends of which are held in a housing 9 and a bearing retainer 10 via ball bearings 7.8. A one-way clutch mechanism is formed by the clutch profile 11 provided on the outer periphery of the clutch inner 6, the roller 5, and the inner periphery of the clutch outer 3.

A shaft 12 is spline engaged with the clutch inner 6 through a first helical spline 13. A pinion 15 is engaged with the tip of the shaft 12 via a second helical spline 14 that is disposed continuously with a first helical spline 13 .

16 is a cushion spring that fixes the pinion 15 in the axial direction, 17 is a spring cover, 18 is a claw 7, and 19 is a spring receiver.

2o is a pinion stop, and 21 is a stop clip that restricts the re-pinion 15 in the axial direction.

22 is a shaft return spring, 23 is a shaft stopper, 2
4 is a stopper clip. Although the load of the shaft return spring 22 is set lower than that of the cushion spring 16, it has sufficient load characteristics to allow the shaft 12 to return after moving forward.

Next, the biting operation will be explained using FIG. 3.

The shaft lever 25 pushes out the shaft 12, and at the same time, the torque generated by the motor is transmitted from the shaft 1 via the armature gear 2 to the clutch gear 4 of the clutch outer 3, and the shaft 12 is transferred via the roller 5 to the first helical spline 13 of the clutch inner 6. Then, it is further transmitted from the second helical spline 14 to the pinion] 5. The axial force from the shaft lever 25 and the torque 7 from the motor act on the pinion 15, causing the pinion 15 to engage the ring gear 26.

Here, when the pinion 15 and the ring gear 26 come into contact with each other at their corner portions, engagement cannot be achieved only by the axial force and torque described above. In this state, the shaft 12 is connected to the shaft lever 25.
When the nion 15 is moved in the axial direction by a distance of 6, the nion 15 is dislocated due to the angle difference between the first helical spline 13 and the second helical spline 14, the non-engaged state is released, and engagement is performed.

According to this embodiment, the first helical spline 13 and the second
The helical spline 14 is continuously arranged, and the pinion 1
5 on the second helical spline 14; Spring cover 17. Splash catch 1
9 in front of the pinion 15 and the second helical spline 14, the position of the pinion 15 and the second helical spline 14 can be moved as much as possible toward the clutch inner 6, so that the axial length of the shaft 12 can be reduced. can be shortened. Therefore, it is possible to downsize the pinion clutch section.

Furthermore, the mechanical strength of the pinion clutch is improved by reducing the bending moment by downsizing the pinion clutch, and by eliminating the shaft detail between the first helical spline 13 and the second helical spline 14 on the shaft 12 and its notch. I can do it.

〔Effect of the invention〕

According to the present invention, there is an effect of reducing the size and improving the mechanical strength of a pinion clutch with excellent engagement properties, and also having an effect of improving the centrifugal force and vibration resistance of the starter.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the pinion biting mechanism according to the present invention, and FIG.
The figure is a partial sectional view of the pinion biting mechanism, and FIG. 3 is an explanatory diagram of the car biting operation. 12... Shaft, 13... First helical spline, 14... Second helical spline, 15... Pinion, 16... Cushion spring, 17... Spring cover 18... Tome 7.19.・Spring holder, 2o・
...Pinion 1st figure $3

Claims (1)

[Claims] 1. A starter having a reduction gear between a motor and a pinion clutch, which includes a pinion shaft connected to the inner circumference of the clutch inner circumference of the pinion clutch and movable in the axial direction, and a pinion disposed at one end of the pinion shaft. In this starter, a first helical spline coupled to the clutch inner and a second helical spline coupled to the pinion are continuously provided in the axial direction on the pinion shaft, and the second helical spline on the pinion shaft is connected to the clutch inner. A pinion stopper and a clip for holding the pinion in the axial direction are arranged in a portion having a different diameter, and a cushion spring for holding the pinion by applying preload in the axial direction is arranged between the pinion tip portion and the pinion shaft. A starter with a speed reduction mechanism, which is characterized by being installed in a. 2. In claim 1, the gear part of the pinion and the second
A starter with a reduction mechanism characterized by a helical spline arranged in one direction in the circumferential direction. 3. The starter with a speed reduction mechanism according to claim 1, wherein the pinion contacts the pinion stopper at the end surface of the shaft of the second helical spline.