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Automatic speed reducing ratio-switching apparatus

A technology of conversion device and reduction ratio, which is applied in the direction of transmission device, belt/chain/gear, mechanical equipment, etc., and can solve the problem that the speed of the screw shaft cannot be increased.

Active Publication Date: 2005-12-14
SMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even when the load torque applied to the electric cylinder is small, the movement speed of the screw shaft cannot be increased to a high speed for extending operation.

Method used

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  • Automatic speed reducing ratio-switching apparatus

Examples

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Embodiment Construction

[0044] Fig. 1 is an exploded perspective view showing an automatic speed reduction ratio switching device according to a first embodiment of the present invention. As shown in FIG. 1 , the automatic reduction ratio switching device 10 includes housings 12 a , 12 b and a planetary gear mechanism 14 constituted by being divided into two parts.

[0045] The housing 12a has a rectangular cross section. On the inner side of the housing 12a are formed locking portions 32a to 32d for locking and receiving with the internal gear 20 as described later when the internal gear 20 is parallelly moved toward the direction of the input shaft 26 as described later. Sections 30a to 30d engage the arcuate protrusions. In addition, the housing 12a is provided with a bearing portion 34a for rotatably supporting the input shaft 26 . The housing 12b has a rectangular cross-section like the housing 12a. Lock portions 33a to 33d are formed on the inner side of the housing 12b for engaging with the...

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Abstract

Central gear (16), planetary gear (18) and internal gear (20) adopt helical gear. Therefore, when a load exceeding a predetermined torque is applied to the internal gear (20), the internal gear (20) rotates in a direction different from that of the sun gear (16) along a direction toward the input shaft (26). Direction or towards the direction of the output shaft (28), thereby automatically switching the reduction ratio.

Description

technical field [0001] The present invention relates to an automatic reduction ratio switching device capable of automatically switching a reduction ratio of a displacement member transmitted from an output shaft to an actuator by using a planetary gear mechanism when a load exceeding a predetermined torque is applied. Background technique [0002] Those devices to which reduction ratio conversion mechanisms have been applied so far include, for example, mechanical systems such as construction machinery. In this mechanical system, an electric cylinder is used as an actuator for driving the extension / retraction operating system of the link mechanism. [0003] In such an electric cylinder, a rotary shaft is connected to an input portion of a motor in a housing, and a screw shaft is arranged in the rotary shaft. The screw shaft is threaded onto a nut member rotatably supported in the housing. Two pairs of planetary gear mechanisms with different reduction ratios are provided ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/20
Inventor 永井茂和齐藤昭男增井隆一今村正树
Owner SMC CORP
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