Patent ID: 8133141

Claim:
A hydraulic system for actuating a continuously variable belt-driven conical-pulley transmission having two conical pulleys encircled by an endless torque-transmitting means, each of which includes two conical disks, one of which is axially movable as a function of the pressure in an associated pressing chamber, and having a torque sensor which includes a torque sensing chamber that is connected to a hydraulic energy source and is in fluid communication with the pressing chambers, said hydraulic system comprising: a first hydraulic resistance element positioned between and communicating with each of respective first pressing chambers associated with respective ones of the axially movable conical disks and the torque sensing chamber, and a second hydraulic resistance element in a conduit connecting each of the first pressing chambers to a second pressure chamber in which second chamber a lower pressure prevails than pressures in the first pressing chambers and in the torque sensing chamber.