Gear lead screw

Abstract

The invention discloses a gear lead screw which comprises a helical tooth shaft, a straight tooth gear, a sleeve, end covers, a straight tooth gear shaft, a rolling bearing and the like. A long shaft of which the surface is provided with helical teeth with a certain helical angle alpha is adopted as the helical tooth shaft; the straight tooth gear shaft penetrates through a U-shaped groove which is formed in a square groove, wherein the square groove is formed in the sleeve and inclined to the sleeve axis in an angle which is equal to and has the same direction with the helical angle alpha of the helical tooth shaft; by installing the rolling bearings in blind holes which are formed in the end covers arranged at the two ends of the sleeve and are coaxial with the U-shaped groove, the straight tooth gear installed on the straight tooth gear shaft is driven by a motor to roll along the helical line on the helical tooth shaft; helical transmission is achieved through the mechanical bite force of the straight tooth gear and the helical tooth shaft, and the helical line of a helical motion trail is orthogonal to the helical line of a helical structure of the helical teeth. Compared with a traditional lead screw, the gear lead screw has the advantages that not only is the sliding friction not generated, but also the motion lead angle can be significantly increased, the transmission efficiency is higher, and transmission is more reliable.

Description

technical field [0001] The invention relates to a machine tool, in particular to a gear screw. Background technique [0002] The screw is widely used in machine tool equipment. It is a screw transmission device that converts rotary motion into linear motion and torque into thrust. The traditional screw uses the engagement and relative rotation of internal and external threads to transmit force and motion. , due to the existence of sliding friction, and the movement of the thread lead angle is relatively small, the transmission efficiency is relatively low, the wear is fast, and the service life is short. [0003] In the ball screw, the ball is uncontrolled in the raceway, there is more or less sliding friction, the thread lead angle of the movement is relatively small, and the transmission efficiency is not very high. [0004] The Chinese patent application number is 201310205378.0, and the name of the invention is "a new type of flexible shaft screw transmission device". I...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a gear screw to solve the existing screw transmission structure, the transmission structure proposed by the Chinese patent application number 201310205378.0, the invention name "a new flexible shaft screw transmission device" and the Chinese patent application number For 201510824707.9, the invention name is "a new type of threadless structure elastic flexible shaft screw transmission device". When it is in motion, the transmission efficiency is relatively low, the life is short, and the transmission is not reliable enough.

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