公开(公告)号：US10508726B2

公开(公告)日：2019-12-17

申请号：US15532857

申请日：2014-12-05

Applicant: Harmonic Drive Systems Inc.

Inventor： Tatsuro Hoshina ,  Masaru Kobayashi ,  Akira Nagai

IPC: F16H49/00 ,  F16H57/00

Abstract: A boss-side fastening surface formed in a boss of a flexible externally toothed gear of a strain wave gearing and a shaft-side fastening surface of an output shaft are coaxially fastened with bolts. The boss-side fastening surface is a convex-side fastening surface defined by two symmetrical inclined surfaces that are intersected at a prescribed angle to form a ridge line on a diameter line of the surface. The shaft-side fastening surface is a concave-side fastening surface defined by two symmetrical inclined surfaces that are intersected at a prescribed angle to form a trough line on a diameter line of the surface. The inclination angle of the inclined surfaces is set in the range of 2° to 16°. Transmission torques equal to or larger than those for combined bolt and pin fastening can be secured with bolt-only fastening.