3768715 is referenced by 182 patents and cites 6 patents.

A planetary differential employs a longitudinal shaft having a restricted portion at least two balls directly engaging the longitudinal shaft at said restricted portion forming an inner race. The differential includes further an outer race having a taper engaged by the balls and a cage for the balls. A first rotary input is provided to one of the inner race, outer race, and cage. A secondary rotary input is provided to another of the inner race, outer race, and cage. A rotary output is provided to yet another of the inner race, outer race, and cage. The inner race and outer race are mounted for rotary movement.A servo system, including the planetary differential, is also disclosed.

Title
Planetary differential and speed servo
Application Number
05/249,046
Publication Number
3768715
Application Date
May 1, 1972
Publication Date
October 30, 1973
Inventor
Tout Stanley D
Assignee
Bell & Howell Company
IPC
B65h 23/18
F16H 13/00
F16H 13/08
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