Patent ID: 6368246
Filing Date: 2002-04-09
Classification: F16H,Y10T

Abstract:
A drive unit for a motor vehicle with a continuously variable transmission, comprising:a first pair of conical disks associated with an input side of the continuously variable transmission, a second pair of conical disks associated with an output side of the continuously variable transmission, an endless chain-belt arranged to transmit torque between the first and second pairs of conical disks, a first belt-tightener control member associated with the first pair of conical disks and a second belt-tightener control member associated with the second pair of conical disks, the first and second belt-tightener control members being supplied with a pressure produced at least in part by a torque sensor to generate a compressive force for gripping the chain-belt, at least one ratio-shifting control member associated with at least one of the pairs of conical disks to shift a transmission ratio of the continuously variable transmission, a transmission-ratio valve supplying the at least one ratio-shifting control member with an amount of pressure depending on the transmission ratio to be set, a cooperative arrangement of a pressure valve and an OR-gate valve to influence the amount of pressure supplied to the transmission-ratio valve, wherein the OR-gate valve and the pressure valve interact with each other through an interposed push member so that transverse force components are for the most part eliminated, and wherein the OR-gate valve has a first slide piston, the pressure valve has a second slide piston, and wherein further the first and second slide pistons are arranged in a common valve bore of a common valve housing, wherein the interposed push member is received with axial mobility at least partially inside piston bore holes of the first and second slide pistons, wherein the interposed push member has radial play inside the piston bore holes.