Patent ID: 8051650
Filing Date: 2011-11-08
Classification: F16H

Abstract:
1. A hydraulic system for actuating a clutch and/or a variable speed drive unit of a belt-driven conical-pulley transmission having a variably adjustable transmission ratio, of a vehicle, in particular a commercial vehicle, having at least one hydraulic energy source and having a torque sensor, wherein a selector and check valve device for supplying additional components besides the torque sensor is connected between the hydraulic energy source, the additional components, and the torque sensor in such a way that the torque sensor includes priority in being supplied with hydraulic medium, wherein the selector and check valve is a 3/3 directional valve and is positioned downstream of the at least one hydraulic energy device for selectively supplying pressurized hydraulic fluid in a first position only to the torque sensor, in a second position to a pair of transmission ratio valves and to the torque sensor, and in a third position to the pair of transmission ratio valves, to the torque sensor, and to an input to the at least one hydraulic energy source.