Double-stage rigid tooth surface cycloid steel ball planetary gear reducer

Abstract

The invention provides a double-stage rigid tooth surface cycloid steel ball planetary gear reducer which comprises a reducer shell, an input shaft, an eccentric sleeve, steel ball sets, an end cover, a planetary disc, a center disc, an output shaft, a pre-fastening nut, back-up bearings and bearing end covers. The double-stage rigid tooth surface cycloid steel ball planetary gear reducer is of a 2K-H(NN) type double-stage planetary transmission basic structure, inner cycloid grooves and outer cycloid grooves in the end faces of the end cover, the end faces of the planetary disc and the end faces of the center disc serve as the tooth profiles, steel balls serve as mediators to carry out meshed transmission, tooth gaps are eliminated through four-point contact between the steel balls and the cycloid grooves, and the double-stage rigid tooth surface cycloid steel ball planetary gear reducer has the advantages of being simple in structure, small in size, large in transmission ratio, free of the tooth gaps, high in transmission accuracy and high in efficiency; meanwhile, the inner cycloid grooves and the outer cycloid grooves of the double-stage rigid tooth surface cycloid steel ball planetary gear reducer are respectively formed by two cycloid split discs in an assembled mode, surface heat treatment and grinding are conveniently carried out on the cycloid tooth surfaces of the split discs, and the double-stage rigid tooth surface cycloid steel ball planetary gear reducer has the advantages of being high in tooth surface rigidity, small in heat treatment deformation, resistant to abrasions and long in service life.

Description

technical field [0001] The invention relates to a high-precision deceleration transmission device, especially a high-precision deceleration transmission device for a robot, which can also be widely used in the fields of precision manufacturing, aviation, automobiles, instruments and meters. Background technique [0002] In order to improve the transmission accuracy and control accuracy of the robot, the reduction transmission device for the robot is required to have the characteristics of compact structure, small size, light weight, large transmission ratio, small backlash, fast response, and high efficiency. Maintain high reciprocating positioning accuracy within a short period of time. [0003] Existing high-precision reduction transmission devices for robots generally use involute planetary gear reducers, RV reducers, harmonic gear reducers or cycloidal steel ball reducers. Due to the inevitable backlash of the involute planetary gear reducer, high gear manufacturing acc...

AI Technical Summary

Problems solved by technology

Although the RV reducer has the advantages of high rigidity and high transmission precision, because the combined structure of cycloidal pinwheel transmission and involute planetary gear transmission is used to increase the transmission ratio, the structure is complex and the manufacturing and assembly precision requirements are high.

At the same time, in order to reduce or eliminate the backlash, the RV reducer often needs to modify the tooth profile, which increases the difficulty of the manufacturing process.

The harmonic gear reducer adopts deformable flex splines to eliminate backlash, and has high transmission accuracy, but the shortcomings of its flex splines are poor in strength, easy to wear, short in life, and insufficient in transmission rigidity.

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