Patent ID: 8281893
Filing Date: 2012-10-09
Classification: B62D,F16H,Y10T

Abstract:
1. A variable transmission ratio mechanism comprising: an input member rotatable around a first axis; an output member rotatable around the first axis; and an intermediate member joining the input member and the output member so as to allow the input member and the output member to differentially rotate, wherein the intermediate member is rotatable around a second axis slanted with respect to the first axis, the input member includes a first power transmission surface, the intermediate member includes a first power transmission surface facing to the first power transmission surface of the input member, and on the first power transmission surface of the intermediate member, a plurality of first engaging sections is arranged along a first arrangement pitch circle centered on the second axis, on the first power transmission surface of the input member, a plurality of first engageable sections is arranged annularly around the first axis, the first engaging sections are engageable with the first engageable sections on a first engagement circle centered on the first axis, the output member includes a second power transmission surface, the intermediate member includes a second power transmission surface facing to the second power transmission surface of the output member, on the second power transmission surface of the intermediate member, a plurality of second engaging sections is arranged along a second arrangement pitch circle centered on the second axis, on the second power transmission surface of the output member, a plurality of second engageable sections is arranged annularly around the first axis, the second engaging sections are engageable with the second engageable sections on a second engagement circle centered on the first axis, and a diameter of the first arrangement pitch circle and a diameter of the second arrangement pitch circle are different from each other.