A hydraulic anti-backlash screw nut

Abstract

The invention discloses a hydraulic anti-backlash ball screw nut, which comprises a ball screw nut body, sealing rings and pressure plates at both ends of the nut body; The end of the one-way oil injection hole is connected with the inner raceway of the ball screw nut body, and the outer end of the one-way oil injection hole is equipped with an oil injection joint, which can be connected with the oil inlet pipeline of the external pressure source; the other end of the ball screw nut body is provided with a joint The inner end of the throttling exhaust hole communicates with the inner raceway of the ball screw nut body. The present invention makes the balls inside the ball screw nut pair always stick to one side of the screw thread and the other side of the screw nut through the static or dynamic pressure applied to the raceway of the ball screw nut pair, thereby eliminating the need for the screw and the nut transmission pair. The backlash between them improves the transmission accuracy.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission, and in particular relates to a hydraulic anti-backlash lead screw nut. Background technique [0002] In the field of mechanical transmission, ball screw nut pair transmission is the most common transmission method that converts rotary motion into linear motion. Due to the inevitable machining errors in machining, transmission errors are caused. In the process of use, the backlash between the screw and the nut transmission pair always exists in the transmission of the screw nut pair and changes with the change of the transmission distance, which greatly affects the transmission accuracy of the screw nut pair; [0003] At present, in order to improve the transmission accuracy of the ball screw nut pair, there are mainly the following four methods: one is to improve the manufacturing accuracy of the screw nut pair, but due to the limitation of machining methods and processing costs,...

AI Technical Summary

Problems solved by technology

Due to the inevitable machining errors in machining, resulting in transmission errors

In the process of use, the backlash between the screw and the nut transmission pair always exists in the transmission of the screw nut pair and changes with the change of the transmission distance, which greatly affects the transmission accuracy of the screw nut pair;

[0003] At present, in order to improve the transmission accuracy of the ball screw nut pair, there are mainly the following four methods: one is to improve the manufacturing accuracy of the screw nut pair, but due to the limitation of machining methods and processing costs, it is far from being able to meet the requirements. The demand for high-precision transmission; the second is to use electrical compensation to eliminate the backlash, but due to the existence of machining errors, the backlash is a variable, so the existing electrical compensation can only improve the transmission accuracy to a limited extent ; The third is to adopt the double nut anti-backlash structure, which is also because of the high manufacturing cost caused by the complex structure and high manufacturing precision requirements, making this structure difficult to apply on a large scale; the fourth structure is to use the tension of the spring to eliminate the backlash , although this structure is simple, it can only be applied to occasions where the linear stroke is short, and because the tension of the spring will change with the increase of the stroke, the transmission load will change, thus affecting the transmission accuracy

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