STRUCTURE FOR FASTENING FLEXIBLE EXTERNAL TOOTH GEAR OF WAVE GEAR DEVICE TO SHAFT MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a fastening structure capable of assuring sufficient transmittance of torque by fastening a bolt only between a hub of a flexible external tooth gear and a shaft member and further easily simplifying a centering between both members.SOLUTION: A convex side fastening surface 12 of a hub 7 of a flexible external tooth gear 3 of a wave gear device and a concave side fastening surface 13 of an output shaft 11 are coaxially fastened and fixed by bolts under a state in which the first and second pins 31, 32 are installed. The convex side fastening surface 12 is defined by symmetrical inclination surfaces crossed with its diameter line being applied as a ridgeline 16, and the concave side fastening surface 13 is defined by symmetrical inclination surfaces crossed with its diameter line being applied as trough line 17. The first pins 31 and 32 are arranged along a diameter direction crossing at a right angle with the ridgeline 16. Centering between both fastening surfaces 12 and 13 is carried out by the ridgeline 16 and the trough line 17 and by the first pins 31 and 32 extending in a direction crossing at a right angle with them.SELECTED DRAWING: Figure 8