Patent ID: 6902502

Claim:
A continuously variable transmission, comprising: a driving pulley ( 11 ) having a fixed sheave ( 11 a ) fixed onto a driving shaft ( 10 ) and a movable sheave ( 11 b ) supported by said driving shaft ( 10 ) movably in the axial direction; a driven pulley ( 21 ) having a fixed sheave ( 21 a ) fixed onto a driven shaft ( 20 ) and a movable sheave ( 21 b ) supported by said driven shaft ( 20 ) movably in the axial direction; an endless belt which is not lubricated with oil wound around said driving pulley ( 11 ) and said driven pulley ( 21 ); tension-adjusting device ( 50 ) for pressing the slack side of said belt ( 15 ) to generate belt tension; a ratio-changing motor ( 40 ); stroke mechanisms ( 14 , 22 ) provided on said driving pulley ( 11 ) and on said driven pulley ( 21 ) respectively for axially shifting said movable sheaves ( 11 b , 21 b ) depending on inputted rotational force; and a gear mechanism ( 42 , 45 , 45 a , 45 b , 14 d , 46 , 46 a , 46 b , 22 d ) for transmitting rotational force generated by said motor ( 40 ) to said stroke mechanisms ( 14 , 22 ) on the respective pulleys as well as for mechanically interconnecting both of said stroke mechanisms ( 14 , 22 ) in such a way that said movable sheaves ( 11 b , 21 b ) of said pulleys can be shifted synchronously and axially in opposite directions to each other in relation to said fixed sheaves ( 11 a , 21 a ), wherein said gear mechanism ( 42 , 45 , 45 a , 45 b , 14 d , 46 , 46 a , 46 b , 22 d ) comprises: a shift input gear ( 14 d ) provided coaxially on said driving pulley ( 11 ); a shift input gear ( 22 d ) provided coaxially on said driven pulley ( 21 ); and a shift-operating shaft ( 46 ) which has shift-operating gears ( 46 a , 46 b ) for engaging with said shift input gears ( 14 d , 22 d ) on the respective pulleys, wherein the lengths of said first and second shift-operating sears ( 46 a , 46 b ) correspond to Stroke distances of said stroke mechanisms ( 14 , 22 ) on the driving and driven pulleys, respectively.