公开(公告)号：US20210131543A1

公开(公告)日：2021-05-06

申请号：US16473820

申请日：2017-01-21

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Yoshitomo MIZOGUCHI ,  Yuya MURAYAMA ,  Shizuka YATA

IPC: F16H49/00

Abstract: A strain wave gearing has a wave generator which flexes an externally toothed gear in a radial direction to form meshing portions thereof with an internally toothed gear in positions that are separated along a circumferential direction of the externally toothed gear. When the wave generator rotates, the meshing portions move in the circumferential direction. Non-meshing regions are formed in part of the meshing portions along the tooth trace direction thereof. The non-meshing regions are those of a prescribed width including the support center of a wave bearing in the tooth trace direction. The concentration of stress in the tooth root of the externally toothed gear can be alleviated, and the tooth-root fatigue strength of the externally toothed gear can be increased.