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Transmission case

A transmission and box technology, applied in the field of transmission box, can solve problems such as misalignment or shaking, productivity and suppression of production cost obstacles, and achieve the effects of improving productivity, reducing production costs, and firmly joining

Inactive Publication Date: 2015-11-18
NIDEC SHIMPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the planetary gear mechanism, since a large torque is applied to the internal gear, in the case of a conventional transmission case in which the internal gear is fixed by a pin, if the engagement is insufficient, misalignment or rattling may occur.
Therefore, both require high molding accuracy and assembly accuracy, which is an obstacle to improving productivity and suppressing production costs.

Method used

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Embodiment Construction

[0065] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely an illustration in essence, and this description does not limit this invention, its application, and its use.

[0066] figure 1 It shows the speed reducer (transmission) to which the present invention is applied. The speed reducer has a case 1 (transmission case), an input unit 2, a planetary gear mechanism 3, an output shaft 4, and the like. In this speed reducer, a drive shaft of an electric motor and the like are connected to an input unit 2 , whereby rotational driving force is input from the input unit 2 to the speed reducer. The rotational speed thereof is reduced by the planetary gear mechanism 3 , and a rotational driving force with increased torque is output through the output shaft 4 .

[0067] The planetary gear mechanism 3 is composed of a sun gear 31 , a plurality of planetary gears 32 , an internal ge...

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Abstract

The invention provides a transmission box body, which enables an inner gear to be stably and firmly connected to the transmission box body. The transmission box body includes a first box body part (10) surrounding the periphery of a sun gear (31) and a planet gear (32), and an cylinder inner gear (33) is fixedly arranged at the inner side of the first box body part (10) with a rotation axial line (A) consistent with a solar gear (31). One end of the inner gear (33) is provided with an annular plate (53) protruding more inwardly than the end of teeth. The periphery of the inner gear (33) is provided with concave and convex anti-slipping protions (54). The first box body part (10) is molded by die casting, and the inner gear (33) is molded at the first box body part (10).

Description

technical field [0001] The invention relates to a transmission case provided with an internal gear. Background technique [0002] Conventionally, a transmission using a planetary gear mechanism is known for a transmission unit such as a speed reducer. A planetary gear mechanism generally consists of a sun gear, a plurality of planetary gears, a planetary carrier, and an internal gear. [0003] For example, in a speed reducer, each planetary gear is rotatably supported by a carrier connected to the output shaft, and is arranged around the sun gear so as to mesh with the sun gear. An internal gear is non-rotatably arranged around these planetary gears and meshes with these planetary gears. By rotationally driving the sun gear, each planetary gear revolves around the sun gear. With the revolution of the planetary gears, the planetary carrier decelerates and rotates, and its rotational power is output through the output shaft. [0004] Usually, the internal gear is fitted in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H57/02F16H57/023F16H55/17
Inventor 大塚智之
Owner NIDEC SHIMPO CORP