JPS63266166A - Planetary gear reduction type starter - Google Patents

Abstract

PURPOSE:To reduce the generation of gear noise, by a method wherein spring rings to absorb a maximum vibration size due to eccentricity and bending of the rotary shaft of an electric motor are respectively situated between the outer peripheral surface of an internal gear and a center bracket and the inner peripheral surface of a planetary gear and a pinion shaft. CONSTITUTION:A title starter reduces the number of revolutions to transmit the rotation force of a rotary shaft 2, rotated by an electric motor 1, to a pinion 6 through a planetary gear reduction mechanism formed with an internal gear 3 geared with an internal gear fixing engaging part 5a formed integrally with a center bearing 5, and a planetary gear 4 supported to a support shaft 7a being the one end of a pinion shaft 7. In this case, Support springs (ring springs) 9 and 10 are respectively located between the outer peripheral surface of the internal gear 3 and an inner peripheral surface 8a of the internal gear support part of a center bracket 8 to support the internal gear 3 and between the inner peripheral surface of the planetary gear 4, geared with the internal gear 3, and the outer peripheral surface of the planetary gear support shaft 7a. This constitution enables the rocking motion of the gears 3 and 4 in an axial direction and in a direction extending at right angles to the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter having a speed reduction mechanism between the rotating shaft of a starter motor and a pinion, and particularly relates to a starter having a speed reduction mechanism between a rotating shaft of a starter motor and a pinion. This invention relates to a planetary gear reduction type starter configured to have the following characteristics.

[Conventional technology]

Conventionally, the internal gear of a planetary gear reduction type starter is connected to a center bearing through a tooth part integral with the center bearing, and the planetary gear is connected to a planetary gear fixing part at one end of a pinion shaft in parallel with the shaft. However, for example, if the rotating shaft of the electric motor is connected to the internal gear or planetary gear due to bending or eccentricity of the shaft core, the internal gear or planetary gear connected parallel to the shaft may be strained. This caused problems such as gear noise and poor durability due to increased wear. In addition, for devices related to this type of device that transmits data to the pinion shaft via a reduction gear mechanism, Japanese Patent Publication No. 60-10186
etc.

[Problem that the invention seeks to solve]

Conventionally, the reduction mechanism of a planetary gear reduction type starter is.

The rotational force of the electric motor is transmitted to a planetary gear fixed to one end of the pinion shaft that meshes with an internal gear, and then to the pinion via a clutch, but both gears are fixed parallel to the shaft. There is. For this reason, for example, if the motor rotating shaft and the central shaft of the internal gear or planetary gear are bent or eccentric and mesh with each other, the load will be applied to only a portion of the gear, resulting in strain. In this case, the internal gears and planetary gears that are meshed parallel to the shaft are not designed to solve this problem, resulting in problems such as gear noise and decreased durability due to increased wear. there were.

The purpose of the present invention is to reduce gear noise and improve durability and reliability by providing ideal meshing even when the shaft cores are bent or eccentric.

[Means for solving problems]

When connecting the motor rotating shaft, bending or eccentricity of the shaft core may occur, but in this case the internal gears that are meshed.

Since the planetary gear is fixed, the above electric! ! lI It does not mesh parallel to the machine rotation axis. Therefore, the load is applied only to a portion of the internal gear and planetary gear.

In order to solve the above-mentioned problem, in order to solve the above problem, we have developed a system between the outer circumferential surface of the internal gear to be meshed and the inner circumferential surface of the inner first wheel support part that supports the internal gear, and between the inner circumferential surface of the planetary gear and the outer circumferential surface of the planetary gear support shaft. Between,
A spring ring is provided that absorbs the maximum runout caused by eccentric bending of the motor rotating shaft and has enough spring deflection and spring load to hold the gear.

According to this structure, the internal gear and the planetary gear can swing in the axial direction and in the direction perpendicular to the axis with respect to their respective axes. As a result, even if the motor rotation shaft is connected due to bending or eccentricity of the shaft core, the internal gear and planetary gear will mesh in parallel with the motor rotation shaft due to the rocking action, reducing gear noise and improving durability. can be measured.

[Effect]

Maximum runout dimension between the outer circumferential surface of the internal gear and the inner circumferential surface of the internal gear support part that supports the internal gear, and between the inner circumferential surface of the planetary gear and the outer circumferential surface of the planetary gear support shaft due to eccentric 2-bending of the motor rotating shaft, etc. By providing a spring ring that has enough spring deflection and spring load to absorb and hold the gear, the internal gear can be connected to the internal gear support part, and the planetary gear can be connected to the planetary gear support shaft through the spring ring. It will be retained.

As a result, the internal gear and the planetary gear can swing in the axial direction and in the direction perpendicular to the respective axes due to the elastic action of the spring ring.

As a result of the above, even if they are connected due to bending or eccentricity of the axis of the electric rotating shaft, internal gears and planetary gears can oscillate, so they can be ideally meshed parallel to the electric motor rotating shaft. become.

〔Example〕

An embodiment of the present invention will be explained below with reference to FIGS. 1 to 5. FIG. 1 is a sectional view of a 'tf star gear reduction mechanism according to the present invention, and FIG. 2 is a sectional view of a conventional planetary gear reduction mechanism. 3 and 5 are a plan view and a partially sectional perspective view of a planetary gear reduction mechanism according to the present invention, and FIG. 4 is a plan view of an internal gear support spring and a planetary gear support spring of the present invention. A rotating shaft 2 driven by an electric motor 1 is fixed to a planetary gear support shaft 7a provided at one end of a pinion shaft 7.
It meshes with the internal gear 3 that is meshed and connected to the im gear 4 and the internal gear fixed meshing part 5a that is integral with the center bearing, and a pinion 6 that is rotationally driven coaxially with the pinion shaft 7 is attached. be.

The rotational force of the rotating shaft 2 driven by the electric motor 1 is applied to the internal gear 3. In this method, the torque is increased through the planetary gear reduction mechanism of the planetary gear 4, and the rotational speed is decreased and transmitted to the pinion 6. Conventionally, as shown in FIG.
．． The planetary gear 4 is fixed with its tooth surface parallel to the shaft. In this case, for example, if the rotating shaft 2 is connected due to the bending or eccentricity of the shaft center, the internal gear 3. Since the planetary gear 4 is subjected to a large load locally, it is mechanically strained, generates gear noise, and suffers from reduced durability and reliability due to increased wear.

As shown in FIGS. 1 and 3 to 5, according to the present invention, between the outer peripheral surface of the internal gear 3 and the internal peripheral surface 8a of the internal gear support portion of the center bracket 1-8 that supports the internal gear 3, There is an eccentric 9 bend of the motor rotating shaft 2 between the inner circumferential surface of the planetary gear 4 that meshes with the internal gear 3 and the outer circumferential surface of the planetary gear support shaft 7a at one end of the pinion shaft 7 that supports the idler ffi gear 4. An internal gear supporting spring 9 and a planetary gear supporting spring 10 are provided, which can absorb the maximum runout size caused by the above, and provide a spring deflection amount and spring load that can hold the internal gear 3 and the planetary gears 4.

As a result, the internal gear 3 and the planetary gear 4 can swing in the axial direction and in the direction perpendicular to the respective axes due to the elastic action of the spring ring. Even if the connection is caused by bending or eccentricity of the core,
Since the internal gear 3 and the planetary gears 4 are meshed in parallel with the motor rotating shaft 2 by the oscillating motion, there is an effect of reducing gear noise and increasing durability and reliability.

〔Effect of the invention〕

According to the present invention, between the outer circumferential surface of the internal gear and the inner circumferential surface of the internal gear support part of the center bracket that supports the internal gear, and between the inner circumferential surface of the planetary gear that meshes with the internal gear and the pinion shaft that fixes the planetary gear. A spring ring is installed between the outer circumferential surface of the planetary m stand-up shaft at one end, which absorbs the maximum runout caused by eccentric bending of the motor rotating shaft, and has enough spring deflection and spring load to hold the gear. By providing this, the internal gear and the planetary gear can swing with respect to their respective axes due to the elasticity of the spring ring.

This has the effect of reducing gear noise and increasing durability and reliability due to ideal meshing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the planetary reduction mechanism of the present invention, Fig. 2 is a sectional view of the conventional planetary reduction mechanism, Fig. 3 is a plan view of the planetary reduction mechanism of the invention, and Fig. 4 is the internal gear of the invention. FIG. 5 is a partially sectional perspective view of the planetary reduction mechanism of the present invention. DESCRIPTION OF SYMBOLS 1... Electric motor, 2... Motor rotating shaft, 3... Internal gear, 4... Planetary gear, 5... Center bearing, 5a.
... Internal gear fixed meshing part, 6... Pinion, 7... Pinion shaft, 7a... Planet' gear support shaft, 8...
Center bracket, 8a...Internal gear support part, 9...
・Internal gear support spring, 10... Planetary gear support spring.

Claims (1)

[Claims] 1. In a coaxial reduction starter equipped with a planetary gear device as a reduction mechanism, the input shaft is the shaft of the central sun gear, and the output shaft is the rotating shaft of the planetary gear meshing with the sun gear and the internal gear. The electric motor rotates between the outer circumferential surface of the gear and the inner circumferential surface of the internal gear support part that supports the internal gear, and between the inner circumferential surface of the planetary gear meshed with the internal gear and the outer circumference of the planetary gear support shaft that supports the planetary gear. By providing a spring ring that absorbs the maximum runout due to shaft eccentricity, bending, etc. and has enough spring deflection and spring load to hold the gear, internal gears and planetary gears can be prevented from swinging in the axial direction and in the direction perpendicular to the shaft. A planetary gear reduction type starter characterized by a mechanism that performs dynamic operation.