a belt and conical pulley transmission including pairs of conical pulleys on the drive side and on the driven side , each pair of pulleys including an axially movable and an axially fixed conical pulley . a plate - link chain is disposed between the pulley pairs to transmit torque and includes pressure pieces . a slide rail guides the chain in a chain movement direction and is tiltably supported for tilting movement relative to a support . the slide rail is also movable along the support in a transverse direction relative to the chain movement direction to guide the chain during transmission ratio changes to minimize chain transverse oscillations and consequent acoustic disturbances .