Meshing principle and characteristics analysis of an abnormal cycloidal internal gear transmission

• Published in: Journal of mechanical science and technology 2022-10, Vol.36 (10), p.5165-5179
• Main Authors: Mo, Jingyu, Luo, Shanming, Fu, Shengping, Chang, Xuefeng
• Format: Article
• Language: English
• Subjects: Control; Dynamical Systems; Engineering; Industrial and Production Engineering; Mechanical Engineering; Original Article; Vibration
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-022-0929-5

A novel 2K-H internal meshing abnormal cycloidal gear (ACG) planetary reducer is proposed to tackle the rotor vector (RV) reducer problems, such as complex over-positioning structure, high manufacturing and assembly accuracy requirements. The composite tooth profile of epicycloid-involute-hypocycloid is adopted as the tooth profile of the reducer. The aim of this study was to investigate the meshing principle of such gear and evaluate its transmission characteristics. The meshing principle of tooth profile of the ACG is described. According to the gear geometry theory, the mathematical model of conjugate tooth profile of ACG pair was derived based on the contact path. And the influence of design parameters on the ACG tooth profile were also carried out. Moreover, the non-interference condition of the ACG pair was derived, and then meshing characteristics of the ACG pair were analyzed by numerical example, such as contact ratio, sliding ratio, and meshing efficiency. The bending and contact stresses of the ACG pair were also evaluated by comparing with those of involute pair. The results show that, the ACG has good transmission characteristics, such as small sliding ratio, high transmission efficiency. Compared with the involute gear, the bending and contact stresses of the ACG are reduced. The study lays a theoretical foundation for the optimization design of the ACG and the improved reliability of the ACG reducer.