Roller anti-rotating mechanism of linear screw actuator

Abstract

The invention relates to a roller anti-rotating mechanism of a linear screw actuator. The roller anti-rotating mechanism is characterized in that the roller anti-rotating mechanism comprises rollers (5), an axle (5a), a screw threaded sleeve (8), a screw (9) and an actuator shell (10). The screw threaded sleeve (8) is matched with the screw in a threaded mode. Two axial-extending V-shaped groovesare formed in the outer cylindrical surface of the crew threaded sleeve (8). The V-shaped grooves are symmetrically distributed on the outer cylindrical surface of the screw threaded sleeve (8). The two rollers (5) are rotatably supported in the shell through the axle (5a). The two rollers (5) are pressed in the two V-shaped grooves correspondingly. By rotating the screw, the screw threaded sleevecan reciprocate and cannot rotate. According to the roller anti-rotating mechanism of the linear screw actuator, a sliding key is replaced with the rollers, sliding friction contact is changed into rolling contact, and the rollers are in no clearance contact with the screw threaded sleeve, so that the linear actuator is high in precision, long in service life, capable of achieving no additional load, safe and reliable.

Description

technical field [0001] The invention belongs to the anti-rotation field of screw thread sleeves, and relates to a roller anti-rotation mechanism of a linear screw actuator. Background technique [0002] The anti-rotation mechanism of the threaded screw sleeve plays a very important role in the linear actuator. It is a direct structure that converts the rotational motion of the screw screw into the linear motion of the screw threaded sleeve. The anti-rotation mechanism of the screw threaded sleeve is good. If it is damaged, it will directly affect the accuracy, life and reliability of the linear actuator. The existing anti-rotation mechanism of the lead screw thread sleeve of the linear actuator mainly adopts a sliding key structure, and the screw nut is integrally processed, welded, screwed, etc., and the sliding key is installed. There is a sliding groove, and when the threaded sleeve of the lead screw is stretched, the sliding key slides in the sliding groove. This struc...

AI Technical Summary

Problems solved by technology

This structure uses sliding frictional contact to realize anti-rotation, which has the following disadvantages. First, long-time work will cause the anti-rotation mechanism to wear, which will reduce accuracy or even cause failures such as stagnation. Second, it will increase the load. If it is too large, the screw nut will appear "creep" phenomenon, and the accuracy of the actuator cannot be guaranteed

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