Two-stage-parallel cycloidal steel ball speed reducer

Abstract

The invention provides a two-stage-parallel cycloidal steel ball speed reducer, belonging to the field of precise mechanical transmission. The two-stage-parallel cycloidal steel ball speed reducer comprises a shell, an input shaft, a planetary disk I, an eccentric sleeve I, a steel ball set, a planetary disk II, an eccentric sleeve II, a steel ball set, an end cover, an output shaft, a pretension nut, a support bearing and a bearing end cover. The speed reducer adopts the NN two-stage-parallel few-tooth-difference planetary transmission basic structure; by using the inner and outer cycloidal sealed grooves in the end surfaces of the end cover, planetary disk and output shaft as tooth profiles and using steel balls as a medium, meshing transmission is performed; and the four-point contact of the steel balls and cycloidal sealed grooves is utilized to eliminate the tooth space. The speed reducer has the advantages of simple structure, small size, high transmission ratio, zero tooth space, high transmission accuracy and low impact. Meanwhile, as distinguished from the common NN cycloidal steel ball transmission, the two planetary disks are installed on different eccentric shaft sections in a 180-degree symmetric mode, and connected through a steel ball ring groove constant speed unit, thereby achieving the balance between meshing force and inertia force. The speed reducer has the advantages of small inertia force during transmission operation, low load of the swing arm bearing, and long service life.

Description

technical field [0001] The invention relates to a precision deceleration transmission device, which can be applied to precision mechanical transmission fields such as robots, numerical control machine tools, aviation, medical equipment, instruments and meters. Background technique [0002] In order to improve the transmission accuracy and control accuracy of precision machinery such as robots, the reduction transmission device is required to have the characteristics of compact structure, small size, large transmission ratio, small backlash, fast response, and high efficiency. At the same time, the reduction transmission device is required to have high Reciprocating positioning accuracy. [0003] The existing commonly used precision reduction transmission devices mostly adopt the mechanism form of single-stage K-H-V type or two-stage NN type transmission with small tooth difference. Among them, the single-stage K-H-V type transmission with small tooth difference can realize ...

AI Technical Summary

Problems solved by technology

Among them, the single-stage K-H-V type transmission with small tooth difference can realize relatively small transmission, especially the single-stage cycloidal steel ball transmission, because it adopts the combination of the number of teeth with two tooth differences, the realizable transmission ratio is even smaller, and it is difficult to adapt to robot equipment. The need for low-speed operation

The two-stage NN type transmission with small tooth difference can achieve a higher transmission ratio, but the common NN type cycloid steel ball transmission, the two planetary gears are installed on the same eccentric shaft section, the inertia force is large during transmission operation, and the load on the rotating arm bearing is very large. , low life, difficult to have excellent transmission performance

This utility model solves the problems of precision steel ball planetary reducer due to the wear and tear of the meshing pair, resulting in transmission hysteresis and jamming caused by the thermal expansion of the meshing pair. In the NN type small tooth difference transmission mechanism, the two planetary discs are installed on the same eccentric shaft section, the inertial force is large during transmission operation, the load of the arm bearing is large, and the service life is low, and the machining accuracy and assembly accuracy of the combined planetary disc are required Very high, so the transmission performance is not good

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