Luk Lamellen Und Kupplungsbau Beteiligungs Kg

Luk Lamellen Und Kupplungsbau Gmbh

Ulrich Helfmeier

Ludwig Winkelmann

Dieter Adler

Roland Welter

Rainer Venz

Harald Peschke

Karl-Ludwig Grell

Thomas Bertelshofer

Uwe Stratil

Wolfgang Fugel

Manfred Kraus

Urban Panther

Peter Giese

Gerhard Meyer

Jean-Francois Heller

Uwe Abraham

Manfred Jansen

Wolfgang Sulger

Volker Lang

Axel Rogner

Ernani Almeida

The friction clutch between the prime mover and the change-speed transmission in the power train of a motor vehicle is actuatable by a slave cylinder cooperating with a master cylinder wherein the piston is movable by a clutch pedal or by an electric actuator. The casing of the slave cylinder is made, at least in part, of a plastic material and defines a plenum chamber arranged to receive pressurized fluid from the master cylinder by way of a conduit extending through a bell which contains the clutch and the slave cylinder. The annular piston of the slave cylinder surrounds the input shaft of the transmission. The plastic material of the casing of the slave cylinder can contain one or more additives which enhance its strength and/or influence its frictional engagement with the adjacent surfaces of the piston or of a lip seal which reciprocates with the piston. The piston and/or the lip seal can be installed in the casing to contact one or two metallic or plastic guide sleeves which are connected to or form part of the casing.

Hydraulic operating arrangement for clutches and the like

A master cylinder for use in the power train of a motor vehicle to actuate the brakes or the friction clutch is designed to avoid the generation of screeching noise and/or the transmission of stray movements to the piston rod in response to shifting of the piston relative to the housing and relative to the sealing element(s) between the piston and the housing. This can be accomplished by causing the piston to turn relative to the housing and the sealing element(s) during axial movement in the housing and/or by installing one or more dampers between the piston and the housing and/or between the piston and the piston rod. The dampers can constitute separately produced parts and/or specially configured and/or finished surfaces provided on the piston and contacting the housing and/or the sealing element(s). The invention also relates to improvements in the configuration and/or the material(s) of the piston.

Master cylinder for use in power trains of motor vehicles

Growing community of inventors

Berlin, Germany

Ulrich Helfmeier