FASTENTING STRUCTURE FOR FLEXIBLE EXTERNAL GEAR AND SHAFT MEMBER IN STRAIN WAVE GEARING DEVICE

摘要

A boss-side fastening surface (12) formed on a boss (7) of a flexible external gear (3) of a strain wave gearing device and a shaft-side fastening surface (13) of an output shaft (11) are fastened coaxially with bolts (15). The boss-side fastening surface (12) is a convex fastening surface provided by two symmetrical inclined surfaces that intersect at a prescribed angle with a diameter line (16) of the surface as the ridgeline. The shaft-side fastening surface (13) is a concave fastening surface provided by two symmetrical inclined surfaces that intersect at a prescribed angle with a diameter line of the surface as the trough line. The angle of inclination of the inclined surfaces is set to a value in the range of 2°-16°. Transmitted torques at least equal to those for combined bolt and pin fastening can be secured with bolt-only fastening.