Actuating device for actuation, especially pneumatic actuation,

Details Actuating device for actuation, especially pneumatic actuation, Actuating device for actuation, especially pneumatic actuation,

1998-01-08

2000-02-29

Marmor, Charles A.

192 clutches and power-stop control

Clutches

Operators

192 91A, B62K 2302

Patent

active

060297891

ABSTRACT:
A actuating device for a friction clutch which is arranged in the drivetrain of a motor vehicle in a housing cover between an internal combustion engine and a transmission. The actuating device includes a release bearing arrangement and a positioning servo arrangement for the release bearing arrangement. The positioning servo arrangement has a pressure medium power cylinder arrangement and a control valve connected with a pressure medium source. The control valve includes a valve arrangement which is switchable between at least two control states depending on an actual quantity representing the axial position of the release bearing arrangement and on a control quantity representing a reference position of the release bearing arrangement. In a first control state, there is a pressure medium connection between the pressure medium power cylinder arrangement and the pressure medium source, and in a second control state there is a pressure medium connection between the pressure medium power cylinder arrangement and a pressure compensation port. The valve arrangement includes two valve elements which are movable relative to one another and relative to a valve housing. The control quantity is represented by the position of a first valve element of the two valve elements and the actual quantity is represented by the position of a second valve element of the two valve elements relative to the valve housing. A differential quantity associated with the actual quantity and control quantity is represented by the position of the two valve elements relative to one another.

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patent: 5678673 (1997-10-01), Borschert et al.

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