| 摘要 |
An actuator with a simple function for the control of a friction clutch in the drive train of a motor vehicle having a cylinder/piston unit for generating the contact pressure of the clutch should be fast, inherently safe and nevertheless simple and inexpensive. For this purpose, a controllable pump ( 3 ) generates a pressure medium and makes it available to the cylinder/piston unit ( 1 ) via a self-regulating valve unit ( 2 ). A dump valve ( 8 ) consists of a sleeve ( 10 ) and a spring-assisted slide ( 12 ) therein. The sleeve has a first opening ( 11 ), through which the pressure medium can flow from the cylinder/piston unit ( 1 ). The slide ( 12 ) exposes the opening ( 11 ) in a first position and conceals the opening of a second position. The clutch is controlled in this way by actuating the electric motor.
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