Alfred Teves Gmbh

Itt Automotive Europe Gmbh

Itt Manufacturing Enterprises, Inc.

Klaus Bergelin

Kurt Saalbach

Peter Boehm

Gilbert Bischoff

Willi Hartmann

Hermann Seip

Peter Bohm

Albin Low

Brun-Friedrich Stadler

Heinz-Juergen Preuss

Harald Koenig

Bernhard Hammes

Thomas Kramer

Rudolf Ludwig

Hans-Jurgen Walther

Peter Low

Motor vehicle actuating unit

Piston with piston rod being latchable through a retaining member

Piston with central valve for hydraulic brake systems

The present inventive relates to a master cylinder (1 ) with elastomeric central valves (20) which can be opened in opposition to a relatively high pressure in the pressure chambers (8 and 9) without damage. The sealing face (29) of the valve member (26) is in the form of a hollow cylinder protruding slightly from the broad head portion (24) of the valve pin (21). The valve member sealing face does not, as has been conventional practice, extend radially inwardly past the head portion (24) in the direction of the central bore (13) to avoid being drawn into the bore (13).

Valve seal for a master cylinder

A process for the manufacture of a master cylinder for hydraulic brake units of automotive vehicles. The starting material is a pasty material which is between solid and liquid. In the course of the casting procedure, thin material wall thicknesses are created in the regions of intended openings of the master cylinder, such as the breather bore (14) and the intake bore (5). The floating membrane (12) which forms during the casting process is removed by mechanical machining to open the duct which functions as the intake bore. The breather bore (14) which functions as the compensation bore is formed by a stamping operation.

Process for the manufacture of a piston/cylinder assembly

A process for the precise adjustment of the lost travel of a piston in a master cylinder. Master cylinders typically include a number of components in spatial series arrangement, with all components having individual tolerances. The individual tolerances regarding the lost travel of the piston or pistons, can combine additively in the master cylinder. The resulting lost travel, hence, is relatively large and varies with individual master cylinders. The process provides that the lost travel of the piston or pistons in the master cylinder can be precisely adjusted and, hence, can be kept very low. The position of the piston or pistons is measured in the condition in which they just seal the associated equilibrium ports. Subsequently, the position of the pistons is calculated in consideration of the desired lost travels and, by adjustment of the force planes acting on the desired point, the resting position of the piston and pistons, respectively, is fixed to the desired distance. Moreover, the process determines, in a simple manner, the position of the piston in which the piston by means of its sleeve, just seals the associated equilibrium port.

Process of precisely adjusting the lost travel of at least one piston in

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Niedernhausen, Germany

Klaus Bergelin