Closed cycloid precision gear reducer

Abstract

The invention discloses a closed cycloid precision gear reducer. The closed cycloid precision gear reducer comprises an input part, a pin wheel housing, an output part and a small-tooth-difference inside-gear reducing mechanism. Wheel pins used for being meshed with a cycloidal gear of the small-tooth-difference inside-gear reducing mechanism are arranged on the inner ring of the pin wheel housing in the circumferential direction. The inner ring of the pin wheel housing is provided with containing grooves which correspond to the wheel pins in a one-to-one mode and are used for containing the wheel pins. The wheel pins make double-line contact with the inner walls of the corresponding containing grooves. According to the closed cycloid precision gear reducer, the double-line contact characteristic exists between the wheel pins and the containing grooves in the pin wheel housing; as the wheel pins make double-line contact with the corresponding containing grooves in the tooth width direction, the bending strength is enhanced, and carrying capacity is improved; meanwhile, due to the increase of the number of contact lines, the achievement of the error leveling effect is facilitated, transmission accuracy can be improved, and then the requirements for machining errors and assembly errors can be lowered. Compared with an existing RV gear reducer, the return difference of the closed cycloid precision gear reducer is smaller; besides, the closed cycloid precision gear reducer is compact in structure, long in service life, simple in machining process and low in manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of cycloid reducers, in particular to a closed cycloid precision reducer. Background technique [0002] At present, RV reducers for high-precision robots in China mainly rely on imports, and are monopolized by Japan's Nabtesco. The RV reducers produced by this company have high transmission accuracy, high torsional rigidity, small hysteresis, strong impact resistance, and high efficiency. However, advanced special equipment is required to process the cycloidal gear profile and the pin hole of the pin gear housing, and the process system is complex, and the cycloidal gear profile and the pin hole of the pin gear housing are sensitive to machining errors. In order to obtain a small backlash and make the load evenly distributed, The manufacturing precision is very high. It is precisely because of the high-precision processing requirements of the existing structure of the RV reducer that the product cost is very...

AI Technical Summary

Problems solved by technology

However, advanced special equipment is required to process the cycloidal gear profile and the pin hole of the pin gear housing, and the process system is complex, and the cycloidal gear profile and the pin hole of the pin gear housing are sensitive to machining errors. In order to obtain a small backlash and make the load evenly distributed, The manufacturing precision is very high. It is precisely because of the high-precision processing requirements of the existing structure of the RV reducer that the product cost is very high, and the current processing level in our country is difficult to meet this precision requirement.

[0003] In addition, the half-buried gear structure of the RV reducer without pin gear sleeve is to half bury the pin gear pin in the pin hole of the pin gear housing. Although the problem of bending deformation of the pin gear pin is solved, the existing machining accuracy cannot fully guarantee the pin hole. The consistency between the inner diameter and the outer diameter of the pintooth pin, usually the inner diameter of the pin hole is slightly larger than the outer diameter of the pintooth pin, there is a gap between the pintooth pin and the pinhole of the pintooth housing and a single-line contact occurs, and the hysteresis caused by this part of the error is not easy to control , and the single-line contact is not conducive to the rotation of the pin-toothed pin around its central axis, causing sliding friction between the pin-toothed pin and the cycloidal wheel, resulting in an increase in temperature rise and a decrease in transmission efficiency

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