Machine element or mechanism – Gearing
Patent
1986-09-25
1987-12-29
Braun, Leslie
Machine element or mechanism
Gearing
384523, 384531, 384533, F16H 3300, F16H 3500, F16H 3700
Patent
active
047152478
ABSTRACT:
This invention relates to reduction in frictional torque of a harmonic drive type transmission apparatus having a circular spline, a flexspline, and a wave generator. A wave generator bearing of the wave generator has a retainer for holding a number of balls which roll between the inner and outer races to be in contact with an inner race and an outer race and to be separated from each other in the circumferential direction. The ball retainer has a number of radial pockets for storing the balls. Each pocket is formed into a shape forming a narrow (in the circumferential direction) opening portion at the inner race side and a wide (in the circumferential direction) opening portion at the outer race side. The balls are in contact with the opening portion at the inner race side in the pockets at the minor axis positions of a drive cam, and the balls are in contact with substantially the central portion of the pocket inner surface at the major axis positions of the cam.
REFERENCES:
patent: 3020775 (1962-02-01), Musser
patent: 3285099 (1966-11-01), Parks, Jr. et al.
patent: 4451098 (1984-05-01), Farley et al.
patent: 4493513 (1985-01-01), Osawa et al.
Honda Toshio
Ohhashi Toshiro
Ohtsubo Yasuo
Braun Leslie
Harmonic Drive Systems Inc.
Kabushiki Kaisha Toshiba
Wright Dirk
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