JPS5813246A - Load equalizing distributor for planetary gear - Google Patents

Abstract

PURPOSE:To make equalized distribution of a load to every tooth surface reliable, by absorbing deformation occurred resulting from dimensional error of every component by installing a flexible plate between an output shaft and an internal gear, in a star type gear. CONSTITUTION:One or a plurality of disklike flexible plates 5 having an appropriate elasticity which are in layers are installed between an output shaft 2 supported by a casing 9 through an output shaft bearing 7 and an internal gear 4. With this, an allotted load applicable to each of teeth surfaces is equalized and equal load distribution becomes reliable, by absorbing deformation through elastic deformation of the flexible plate 5 when the deformation is occurred on each of the teeth due to various kinds of dimensional errors to be generated at production time and assembling time of every component.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for uniformly applying loads to gears that transmit rotation and power in a star-shaped planetary gear system.

Generally, a planetary gear device is directly connected to an input shaft by meshing a plurality of planetary gears between a sun gear placed in the center of the device and an internal gear placed concentrically with the sun gear. A device that transmits the rotation of the sun gear to each planetary gear supported by a carrier, and as the planetary gear rotates, the internal gear circumscribed to each planetary gear rotates, and the rotation is transmitted to the output shaft. However, the device transmits power by reducing the rotation speed of the input shaft and extracting the required rotation speed to the output shaft according to the gear ratio of each gear. Due to pitch errors, errors in manufacturing and assembly such as mutual center distance and parallelism, temperature changes, and other causes, the load may not be applied evenly during operation, sometimes causing noise and vibration. Otherwise, it may cause a bearing seizure accident or a gear breakage accident. In order to prevent these accidents, the most effective way to prevent these accidents is to create a structure that applies the load evenly to each gear during operation of the planetary gear system. Conventionally, this method uses rubber springs. , a method using a double gear coupling, a method using a sleeve spring, etc. are known, but those with a simple structure do not ensure even load distribution, and those with good load distribution do not. This has the disadvantage that the structure is complicated and assembly and disassembly are difficult.

In order to solve the above-mentioned drawbacks of the conventional art, the present invention provides a disk-shaped flexible plate that is simple in structure, easy to assemble and disassemble, and has appropriate elasticity between the output shaft supported by the casing and the internal gear. By installing it between the above-mentioned sun gear,
The elastic deformation of the flexible plate absorbs the deformation caused by various errors during manufacturing and assembly of planetary gears, internal gears, casings, etc., and the load applied to the tooth surface of each gear is equalized, resulting in even load distribution. Figure 7 is a vertical sectional view of a star type planetary gear unit showing one embodiment of the present invention, and Figure 2 is a cross-sectional view of a star type planetary gear unit showing an embodiment of the present invention.
This figure shows a sectional view taken along line -I. The planetary gear device of the present invention is integrally constructed by mounting a carrier C) on a casing, and a sun gear (1) is attached to the center of the carrier C).
), and a plurality of planetary gears (the embodiment ÷ indicates the case of 3 gears) rotate in contact with the external teeth of the sun gear (1).
The gears are meshed, each planetary gear (3) is connected to the carrier C.
) is rotatably supported by a star gear shaft (6), and on its outer periphery, an internal gear (→ is meshed with the external tooth of each planetary gear) and rotates in contact with the external teeth of each planetary gear. □, [L' output shaft 0 is supported by the casing (ri) via the output bearing (7)
) and the carrier are equipped with seven or more disc-shaped flexible plates having appropriate elasticity, and the sides of the center of the flexible plate are The flange part of the output shaft Q) and the side surface of the outer peripheral part are connected to the carrier (l
Tightly secured by the flange part of r) and fastening fittings such as multiple bolts! The rotation of the sun gear (1) is transmitted to each planetary gear (3) which is pivotally supported at a fixed position on the carrier.
At the same time, the rotation is transmitted to the internal gear ←) circumscribing each planetary gear (3), and the rotation is transmitted to the elastic flexible plate 0) of the present invention.
It is transmitted to the output shaft (K) via.

The above-mentioned flexible plate 0) has a structure that undergoes appropriate elastic deformation when a load is applied by adjusting the shape, size, thickness, etc. of the flexible plate according to the size of the planetary gear device and the transmitted power. Due to various errors that occur during manufacturing and assembly of the sun gear (1), planetary gear (3), internal gear, (→, carrier (J), casing (R), etc.), each gear may be deformed. If the deformation occurs, the deflection plate 0
), and the shared load applied to the tooth surfaces of each of the gears is equalized by the elastic deformation of the flexible plate (0), ensuring equal load distribution.It has a simple structure and is easy to assemble and disassemble. It is extremely effective as a load equalization device because it can be easily done.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a star-shaped planetary gear device showing one embodiment of the present invention. FIG. 2 is a sectional view taken along the line II in FIG. 1. /: Sun gear 2, output shaft 3: Planetary gear: Internal gear! = Flexible plate 6: Planetary gear shaft: Output bearing g: Ki, Ya Rear: Casing Fig. 1 Fig. 4 Fig. 2

Claims (1)

[Claims] The carrier C) is attached to the casing (ri) and configured as one piece. There is a sun gear G/') in the center of the carrier C).
A plurality of planetary gears (3) rotating in contact with the external teeth of the sun gear (1) are meshed with each other, and the carrier C)
The outer periphery of each planetary gear (3), which is rotatably supported by a planetary gear shaft 0), is meshed with an internal gear ←) that rotates circumscribed to each planetary gear, thereby forming a task-shaped planetary gear device. Seven or more disc-shaped elastic deflectors are installed between the output shaft (2) which is rotatably supported by the casing (W) via the output bearing (7) and the internal gear (→). The central side surface of the plate (3) is fixed to the end surface of the output shaft (-2), and the outer peripheral side surface is fixed to the end surface of the internal gear ←) to ensure even load distribution. Load equalization device for planetary gear systems.