Patent ID: 8491426

Claim:
A Continuously variable transmission for motor vehicles, comprising: a driving pulley ( 1 ); a driven pulley ( 2 ), the driving pulley and driven pulley each comprising a central axis ( 9 ) and two substantially conical pulley sheaves ( 4 , 5 ), each pulley sheave having a cone surface ( 10 ) with a convexly curved contour in a cross-section that includes the central axis ( 9 ) of the respective pulley; and a drive belt ( 3 ) arranged around the driving pulley and the driven pulley, wherein, at least when the transmission is operating, the drive belt is clamped between the two substantially conical pulley sheaves ( 4 , 5 ) of the driving and driven pulleys ( 1 , 2 ), a local radius of curvature (R 10 ) of the convex contour of the cone surface ( 10 ) of the pulley sheaves ( 4 , 5 ) of the driving pulley ( 1 ) decreases in radially outward direction, and a local radius of curvature (R 10 ) of the convex contour of the cone surface ( 10 ) of the pulley sheaves ( 4 , 5 ) of the driven pulley ( 2 ) increases in radially outward direction, wherein a largest local radius of curvature associated with the driven pulley is smaller than a largest local radius of curvature associated with the driven pulley.