Yang Jianming

School of Mechanical Engineering,
University of Shanghai for Science

and Technology,

Shanghai 200093, China

Zhang Ce

 School of Mechanical Engineering, Tianjin University,

Tianjin 300072, China

Lin Zhongqin

Chen Guanlong

School of Mechanical Engineering, Shanghai Jiaotong University,

Shanghai 200030, China

Abstract: A three-ring planetary gear transmission is a novel type of planetary transmission with small tooth number difference. Compared with traditional planetary and gear transmissions, it has many distinguished advantages such as large speed-reduction ratio, high load capability, compact volume etc. One main problem of this transmission is, however, the pre-mature fatigue of bearings. Based on dynamic simulation, this paper analyzes the dynamic load of the planetary bearings and housing bearings in both input shaft and support shaft. The analysis result indicates that the planetary bearings in input shaft are in the most severe condition of load. This is almost coincided with the fatigue records of bearings reported in past publications. A guideline for design of the transmission can be drawn.