Luk Lamellen Und Kupplungsbau Beteiligungs Kg

Schaeffler Technologies Ag & Co .kg

Luk Lamellen Und Kupplungsbau Gmbh

Roland Welter

Matthias Gramann

Ludwig Winkelmann

Urban Panther

Dieter Adler

Gerhard Meyer

Rainer Venz

Ulrich Helfmeier

Peter Giese

Wolfgang Sulger

Harald Peschke

Jean-Francois Heller

Karl-Ludwig Grell

Matthias Zink

Thomas Bertelshofer

Peter Schaaf

Uwe Stratil

Wolfgang Fugel

Manfred Kraus

Manfred Jansen

Uwe Abraham

Ernani Almeida

Axel Rogner

Markus Hausner

Dirk Kluender

Thomas Rammhofer

Simon Ortmann

Gerhard Prosch

Laurent Ineichen

Volker Lang

Markus Heitbaum

Jan Grabenst&auml;tter

Udo Popp

Peter Scholz

Sebastian Honselmann

Jan Grabenstaetter

Rudolf Hoenemann

Jan Sakschewski

Berthold Schneider

Jochen Kinzig

Manuel Baßler

Tim Herrmann

Jan Grabenstätter

The invention relates to a piston-cylinder arrangement, in particular a slave cylinder for a hydraulic clutch actuating device, comprising a cylinder housing which is made of a plastic, in which an annular pressure chamber is formed in which a piston is mounted so as to be axially movable for actuation of a clutch release bearing, wherein the inner wall of the pressure chamber forms a guide sleeve. In the case of a piston-cylinder arrangement which stands up to the pressures and temperatures that occur in operation of the clutch actuating device, a stop is situated on the guide sleeve facing the clutch release bearing, the stop being in the form of a threaded connection.

Piston cylinder arrangement, in particular a slave cylinder for a hydraulic clutch actuating device

A hydraulic system includes a master cylinder having a housing, a piston axially movably disposed in the housing, and a piston rod, the piston bounding a pressure chamber filled with a hydraulic fluid, the piston upon actuation of the master cylinder being axially moved by the piston rod to pressurize the hydraulic fluid; an actuating device for moving the piston rod; a slave cylinder; a pressure-medium line connecting the master cylinder and slave cylinder; and at least one damping element arranged between the actuating device and the slave cylinder.

Hydraulic system

A hydraulic system, especially for motor vehicles includes a master cylinder, a slave cylinder and a pressure medium line connected thereto. The invention provides a hydraulic system which is simple or economical to produce by virtue of the fact that the hydraulic system includes at least one hydraulic plug-type connection with a plug connector and a socket contact and the plug connector includes an abutment and a sealing element which are made of different materials and which are connected together in a material fit.

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

The present invention relates to a hydraulic system, in particular for motor vehicles, including a master cylinder having a housing, a piston which is axially movably disposed therein, which bounds a pressure chamber filled with a hydraulic fluid, and which, upon actuation of the master cylinder, is axially moved by a piston rod acting upon the piston, thereby pressurizing the hydraulic fluid; further including a slave cylinder and a pressure-medium line connecting the cylinders; the master cylinder having an adapter for detachable connection to the pressure-medium line. The objective of improving the connection between the pressure-medium line and the adapter is achieved in that the adapter includes a sleeve made of a metal.

A master cylinder for the clutch or brake of a motor vehicle has a housing for a reciprocable piston one end of which receives the spherical head of a reciprocable piston rod. The head is held in a desired position relative to the piston by a one-piece or composite coupling device having a first section exerting a pull or bearing upon the head of the piston rod and a second section which is confined in or surrounds the end of the piston and urges the first section in a direction to hold the piston rod against axial movements relative to the piston. The coupling device and/or the piston are or can be made of a plastic material, and the connection between such parts is or can be established by snap action.

Master cylinder

The piston of a master cylinder in the power train of a motor vehicle is made, at least in part, of a thermosetting plastic material and cooperates with one or more annular seals to ensure that a source of hydraulic fluid is communicatively connected with the chamber in the housing of the master cylinder when the piston is moved by one or more springs or otherwise in a sense to increase the volume of the chamber. When a pedal or another actuator causes the piston to expel pressurized fluid from the master cylinder into a slave cylinder, the seal or seals cooperates or cooperate with the housing and/or with the piston of the master cylinder to seal the source from the chamber of the master cylinder. The slave cylinder can actuate the friction clutch between the prime mover and the transmission in the power train of the motor vehicle. The piston of the master cylinder is reciprocable by or with a piston rod by way of a ball and socket joint wherein the ball of the piston rod is held against unintentional extraction from the socket of a connector forming part of or being anchored in the piston.

Hydraulic operating systems 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

The cylinder of a cylinder and piston unit in the friction clutch engaging/disengaging apparatus of a power train for use in a motor vehicle is assembled of two separately produced coaxial tubular walls. The outer wall is made of a plastic material and is of one piece with an extension serving to supply pressurized hydraulic fluid from a pump or another source to the plenum chamber for the reciprocable annular piston between the two walls. The inner wall is made of sheet metal and one of its end portions is separably coupled to one end portion of the outer wall by snap action. Such one end portion of the outer wall is separably secured to a support, usually the transmission case in the power train of the motor vehicle.

Clutch engaging and disengaging apparatus

A hydraulic clutch release mechanism has a clutch pedal-operated master cylinder connected with the clutch release member (such as a fork or a bearing) by way of a conduit or by way of a slave cylinder and a conduit. The sealing but separable connection between at least one of the cylinders and the respective conduit comprises a T-shaped fitting having a first section sealingly connected with an end portion of the respective conduit and a second section coupled to the housing of the at least one cylinder by snap action. The fitting further carries a relief valve which opens when the pressure of hydraulic fluid in a plenum chamber of the at least one cylinder rises to a preselected value. The fitting and/or the housing and/or the body of the valve and/or the end portion of the conduit consists of or contains a suitable plastic material, such as polyamide.

Hydraulic clutch release mechanism

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Bühl, Germany

Roland Welter