JPH09177904A - Planetary gear reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to rotate following a pinion gear without bending a thrust washer, by providing the teeth same as the pinion gear, on the outer periphery of the thrust washers neighboring the pinion gear, of the thrust washers. SOLUTION: This planetary gear reduction device furnishes thrust washers 14a, 14a, 14b and 14b to receive the thrusts of a pinion gear 10 and a niddle form roller bearing 13. And on the outer periphery of the thrust washers 14a, the teeth same as the teeth of the pinion gear 10 are provided, and they are engaged with a sun gear and an internal gear and rotated, same as the pinion gear 10. By such a structure, the thrust washers 14a and 14a are rotated following the pinion gear 10, the relative rotation number of the niddle form roller bearing 13 and the thrust washers 14a and 14a can be reduced, and the washer abrasion can be reduced. And, since no slipping variation of the thrust washer 14a by the rotation variation is generated, a partial abrasion can be suppressed. Furthermore, the thrust washers 14a can be formed only the punching process by a press.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear speed reducer.

[0002]

2. Description of the Related Art As a conventional planetary gear speed reducer, for example, there is one as shown in FIG.
9). This conventional device prevents wear on the sliding contact surface between the end face of the pinion gear 01 and the thrust washer 02, and
In order to avoid uneven wear of the inner peripheral surface of the thrust washer 02, the claw portion 03 provided on the thrust washer 02 is fitted into the hole of the pinion gear 01 to make the thrust washer 0
2 is locked to the pinion gear 01.

[0003]

However, in such a conventional planetary gear speed reducer, the number of bending steps of the claw portion 03 provided on the outer peripheral portion of the thrust washer 02 is increased, and the claw portion 03 is There was a problem that it was difficult to secure the flatness of the thrust washer 02 due to the rise. The present invention has been made in view of such a conventional problem, and an object thereof is to solve the above problem by enabling the pinion gear to rotate together without bending the thrust washer.

[0004]

In the present invention, teeth having the same shape as the pinion gear are provided on the outer peripheral portion of the thrust washer,
It was decided to achieve the above purpose. That is, in the present invention, a pinion shaft that rotatably supports the pinion gear, which is provided so as to penetrate the pinion gear of the planetary gear,
A carrier plate fixedly supporting both ends of the pinion shaft, a needle roller bearing interposed between the inner circumference of the pinion gear and the outer circumference of the pinion shaft, and one or more sheets between the end faces of the pinion gear and the carrier plate. In a planetary gear speed reducer equipped with a plurality of interposed washer mounted on the outer periphery of a pinion shaft and having a thrust washer for receiving the thrust of a pinion gear and a needle roller bearing, among the thrust washers, the outer periphery of the thrust washer adjacent to the pinion gear is provided. It has the same teeth as the pinion gear.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of the present invention. First, the configuration will be described. A pinion shaft 1 that is provided to penetrate the pinion gear 10 of the planetary gear reducer A and rotatably supports the pinion gear 10.
1, carrier plates 12a and 12b that fixedly support both ends of the pinion shaft 11, needle roller bearings 13 interposed between the inner circumference of the pinion gear 10 and the outer circumference of the pinion shaft 11, and the pinion gear 10. Planetary planetary gears provided with thrust washers 14a, 14a, 14b, 14b which are mounted on the outer circumference of the pinion shaft 11 and are interposed between both end faces and the carrier plates 12a, 12b to receive the thrust of the pinion gear 10 and the needle roller bearing 13. In the gear reducer A, the pinion gear 10 is provided on the outer peripheral portion of the thrust washer 14a as shown in FIG.
Teeth are provided.

Next, the operation will be described. In this embodiment,
The teeth provided on the outer peripheral portions of the thrust washers 14a, 14a mesh with the sun gear and the internal gear (not shown) like the pinion gear 10, and are rotated by the pinion gear 10. In FIG. 3, the conventional thrust washer installed adjacent to the pinion gear 10 receives the thrust force P of the needle roller bearing 13, and the carrier plates 12a, 12b.
PV values of the end portion of the needle roller bearing 13 and the thrust washer when the relative rotation V is generated between the thrust washer and the pinion gear 10, and FIG. 4 shows the thrust washer 14a of the present embodiment. , 14a are rotated by the pinion gear 10 while receiving the thrust force P of the needle roller bearing (relative rotation speed V = 0 between the thrust washer 14a and the pinion gear 10), the end portion of the needle roller bearing 13 and the thrust washer. 14a and PV value.

As described above, according to the present embodiment, the teeth provided on the outer peripheral portions of the thrust washers 14a, 14a mesh with the sun gear and the internal gear (not shown) to rotate as in the pinion gear 10, so that the thrust is wasted. The washers 14a, 14a rotate with the pinion gear 10, and the needle roller bearing 13 and the thrust washers 14a, 14
The relative rotation speed with respect to a can be reduced, and washer wear can be reduced. Further, as compared with the case where the behavior of the thrust washer 14a is not constrained, the change in slip due to the rotational fluctuation of the thrust washer 14a does not occur, so uneven wear can be suppressed. Furthermore, the thrust washer 14 can be formed only by a punching process using a press.
It is possible to form a and it is easy to secure the flatness.

[0008]

As described above, according to the present invention, since the structure is such that the thrust washer is rotated around the pinion gear without bending, the flatness of the thrust washer can be easily ensured and the thrust washer The relative rotation speed of the pinion gear, the thrust washer and the needle roller bearing can be reduced, and the effect of reducing the wear of the thrust washer can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a planetary gear speed reducer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the embodiment.

FIG. 3 is a PV value characteristic diagram of a needle roller bearing portion and a thrust washer when a thrust washer arranged adjacent to a pinion gear is fixed to a carrier plate and relative rotation occurs between the thrust washer and the pinion gear. Is.

FIG. 4 is a PV value characteristic diagram of the needle roller bearing end portion and the thrust washer of the present embodiment (structure in which the thrust washer rotates together with the pinion gear).

FIG. 5 is a sectional view of a conventional planetary gear reduction device.

[Explanation of symbols]

 A Planetary gear reducer 10 Pinion gear 11 Pinion shaft 12a, 12b Carrier plate 13 Needle roller bearing 14a, 14b Thrust washer

Claims (1)

[Claims] 1. A pinion shaft that pierces a pinion gear of a planetary gear and rotatably supports the pinion gear, a carrier plate that fixedly supports both ends of the pinion shaft, and an inner circumference of the pinion gear and an outer circumference of the pinion shaft. And a needle roller bearing interposed between the pinion gear and the carrier plate, and one or more sheets interposed between the end faces of the pinion gear and the carrier plate are mounted on the outer periphery of the pinion shaft to remove the thrust of the pinion gear and the needle roller bearing. A planetary gear speed reducer having a receiving thrust washer, wherein the same tooth as the pinion gear is provided on the outer peripheral portion of the thrust washer adjacent to the pinion gear in the thrust washer.