Patent ID: 8425362
Filing Date: 2013-04-23
Classification: F16H

Abstract:
1. An inner gear ring with variable tooth-number comprising a pair of tapered discs ( 7 , 8 ) disposed coaxially and capable of changing axial distance through relative movement, wherein inward concave walls ( 9 ) of said two tapered discs ( 7 , 8 ) are facing each other, a curled rack ( 3 ) composed of several teeth ( 1 ) is set between the two facing walls of the tapered discs ( 7 , 8 ), cogs ( 2 ) are set on said teeth ( 1 ), a rear section ( 5 ) of the rack ( 3 ) consists of narrow teeth, a front section ( 4 ) of the rack ( 3 ) is composed of wide teeth is provided with gear ring connecting interfaces (A) for the access of the rear section ( 5 ) of the rack, the rear section ( 5 ) of the rack ( 3 ) passing through the connecting interfaces (A) forms a circular inner gear ring (B), wherein the gear ring connecting interfaces (A) on the first one or more wide teeth ( 6 ) is in the form of opening “n” with the height of the “n”-shaped wide teeth increasing from the first wide teeth, wherein the rear section ( 5 ) of the rack passes through the interface (A) at a tangent to the inner gear ring (B); two side surfaces of the inner gear ring (B) are closely contacted with the inward concave walls ( 9 ) of the two tapered discs ( 7 , 8 ); the inward concave walls ( 9 ) of the two tapered discs are provided with concave faces ( 10 ) fit for the wide teeth, thus to make the inner gear ring (B) formed maintain a circular ring shape; the tooth-number of the inner gear ring (B) that the rear section ( 5 ) of the rack ( 3 ) is in or out of the inner gear ring (B) through the gear ring connecting interfaces (A) varies with the change of the relative distance of the two tapered discs ( 7 , 8 ); the inner gear ring (B) is engaged with at least one planetary gear ( 13 ).