Valeoscope - Clutch Hydraulics CSC CMC CRC 998123

4 The clutch is the interface between the engine and the gearbox. This interface can be disengaged via a release system connected to the clutch pedal to enable gear changes. In engaged position, the disc is squeezed between the two friction surfaces of the flywheel and the pressure plate of the clutch cover. To disengage a push or a pull type clutch, it is necessary to push or to pull the fingers of the diaphragm. The pressure plate then moves against the flywheel and releases the friction. The clutch is then disengaged. This release system can be either mechanical (by clutch cable) or hydraulic.

Why hydraulics?

The mechanical clutch release system consists of a release bearing that is operated by a fork. The fork is attached to a clutch cable operated by the driver’s foot via the clutch pedal. Cars have become lighter and more compact. Car manufacturers demand reduced pedal load linked to comfort reason. Hydraulic systems become mandatory in such cases as they also provide benefits compared to the manual system, increasing efficiency of the actuation with less space required. For these reasons, one vehicle out of two is equipped with a hydraulic system today.

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