Magna Powertrain & Ag & Co. Kg

Magna Drivetrain Ag & Co Kg

Steyr Powertrain Ag & Co. Kg

Dieter Schmidl

Johannes Quehenberger

Franz Gratzer

The invention relates to a friction clutch having a single-acting actuator which is a piston-cylinder unit and is connected in a controllable fashion to a pressurized fluid source. In order to be able to carry out a fast pilot stroke up to the point at which the clutch makes contact, the piston-cylinder unit has a stepped piston whose first step of small diameter delimits, by means of its cylinder, a first pressure space, and whose second step of relatively large diameter delimits, by means of its cylinder, a second pressure space, a pressure line being connected to the first pressure space and, by means of a first non-return valve which opens at a certain pressure, to the second pressure space, and it also being possible for the second pressure space to be connected via a discharge line and a suction line, which contains a second non-return valve, to the fluid reservoir. The invention also relates to a drive device having clutches of said type.

Friction clutch having a hydraulic actuator, and drive unit having at least one such friction clutch

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 () generates a pressure medium and makes it available to the cylinder/piston unit () via a self-regulating valve unit (). A dump valve () consists of a sleeve () and a spring-assisted slide () therein. The sleeve has a first opening (), through which the pressure medium can flow from the cylinder/piston unit (). The slide () exposes the opening () in a first position and conceals the opening of a second position. The clutch is controlled in this way by actuating the electric motor.

Simple action actuator with a hydraulic fast-opening valve for controlling a clutch

A transfer case having a clutch unit, to produce a connection between a first output shaft and a second output shaft includes a claw clutch associated with a synchronizer clutch which comprises a first synchronizer part, which is connected in a rotationally fixed manner to the first output shaft, and a second sychronizer part, which is connected in a rotationally fixed manner to a first clutch part.

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Graz, Austria

Dieter Schmidl