Alfred Teves Gmbh

Itt Automotive Europe Gmbh

Itt Manufacturing Enterprises, Inc.

Kurt Saalbach

Klaus Bergelin

Willi Hartmann

Wilfried Wagner

Peter Boehm

Kai-Michael Graichen

Rudolf Cezanne

Hermann Seip

Kurt Bergelin

Heinz-Juergen Preuss

Thomas Kramer

Rudolf Ludwig

Hans-Jurgen Walther

Dieter Fueller

Peter Low

Vacuum servo brake for motor vehicles

Piston with piston rod being latchable through a retaining member

Piston with central valve for hydraulic brake systems

Load-sensitive twin brake power controller with cup-type dust cover

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

A tandem master cylinder for hydraulic brake systems of automotive vehicles comprising a housing in whose bore a first and a second piston are sealingly and slidably disposed. The piston in the inactive position abut on stops in the housing under the action of a first and a second resetting spring and which, within the bore, confine a first and a second pressure chamber which are in communication with a first and a second unpressurized supply chamber via central valves that are open when in the inactive position. The first piston-resetting spring is anchored on the second piston, and its spring rate is greater than the spring rate of the second piston-resetting spring.

Tandem master cylinder with piston stops and central valves

A pressure cylinder is disclosed having at least one master cylinder piston, provided with a compensating bore which is in connection with opposite sides of the piston and which is closable by a valve piston movable relative to the master cylinder piston. The valve piston is fastened at the end of an extensible central tension element which projects into the pressure chamber of the pressure cylinder and secures through two spring retainers a piston return spring at the master cylinder piston. In order to reduce the idle travel of the master cylinder, the distance between a stop and an abutment face on a flange of the cylinder is first determined and then added to a predetermined functional distance desired to be maintained between the abutment face and a pressure surface on an actuating piston, so that an assembled dimension is determined. The extensible element is adjusted during assembly to position the pressure surface spaced from the stop equal to the assembled dimension.

Pressure cylinder and method of adjusting idle travel

Growing community of inventors

Moerfelden-Walldorf, Germany

Kurt Saalbach