Patent ID: 9394985
Filing Date: 2016-07-19
CPC Classification: F16D,F16H,Y10T

Claim Text:
1. A flexible externally toothed gear of a strain wave gearing comprising: a boss fastened to a fastening-target member; a boss-side fastening surface formed on the boss, the boss-side fastening surface making contact with a member-side fastening surface formed on the fastening-target member; and a plurality of engaging protuberances of a predetermined size formed at a predetermined pitch on the boss-side fastening surface; the engaging protuberances being integrally photo-etched into the boss-side fastening surface; a hardness of the boss-side fastening surface and the engaging protuberances being at least HRC45; the engaging protuberances being tapering protuberances protruding perpendicularly from the boss-side fastening surface; tips of the engaging protuberances being flat peak surfaces parallel to the boss-side fastening surface; and cross-sectional shapes of the engaging protuberances orthogonal to a direction of protrusion thereof are circular, square, or triangular; a pitch of adjacently arranged engaging protuberances is 0.2 to 0.5 mm; a maximum diameter or maximum width of peak surfaces of the engaging protuberances is 0.01 to 0.05 mm; and a height of the engaging protuberances is 1.0 to 1.2 times the maximum diameter or maximum width of the peak surfaces of the protuberances.