Abstract: A continuously variable transmission is provided with a drive belt (3) and with a primary pulley (1) and a secondary pulley (2), each including two conically shaped pulley sheaves (4,5) placed on a respective pulley shaft (6,7) and between which the drive belt (3) is held at a variable radial position (R; Rmin; Rmax). The drive belt (3) is provided with transverse elements (32) that are moveable along a circular tensioning element (31) of the drive belt (3), the transverse elements (32) being provided with axially oriented and convexly curved pulley contact faces (40) for arriving into frictional contact with likewise convexly curved outer sheave surfaces (10) of the pulley sheaves (4,5). In this transmission an annular radially inner section (10f) of the outer sheave surface (10) of at least one pulley (1,2) is provided with either a straight or a concave contour as seen in a tangential cross section.

Abstract: A drive belt for continuously variable transmission for motor vehicles is provided with two pulleys, each including two substantially conical pulley sheaves, between which the drive belt can be held at a variable radial position, which drive belt is provided with transverse elements (32), which on both lateral sides are provided with a flank (40) that is intended for frictional contact with the pulleys, and which, at least in its height direction, i.e. radially relative to the pulleys (1, 2), is provided with a convex curvature, in which flank (40) one or more grooves (41) are provided.

Abstract: Continuously variable transmission provided with a primary pulley and a secondary pulley, around which a drive belt is arranged, clamped between two conical pulley discs of the respective pulley, a running surface of at least one pulley disc of the primary pulley and the secondary pulley, via which running surface this pulley disc contacts the drive belt, being provided, as seen in a cross section oriented perpendicular to a tangential direction, with a curvature, so that a pulley angle between a tangent on the running surface and a radial direction varies between a lowest value at the location of a radially innermost position on the running surface and a highest value at the location of a radially outermost position on the running surface. The curvature of the running surface of the primary pulley and that of the running surface of the secondary pulley differ from one another.