Alfred Teves Gmbh

Itt Manufacturing Enterprises, Inc.

Werner Volkmar

Jochen Burgdorf

Juan Belart

Peter Volz

Bernd Schuett

Helmut Weisbrod

Peter Stahlheber

Peter Stalheber

Rainer Seeger

Closing device for closing pressure fluid conveying channels in a housing

Master cylinder with two internal valves

A hydraulic brake system with slip control wherein at least one wheel brake (11) of an automotive vehicle is connected to a master cylinder (1). A normally opened inlet valve (8) which is adapted to be switched into a closed position is inserted in the connection between the master cylinder (1) and the wheel brake (11). The supply reservoir (6) of the master cylinder (1) contains an opening (13) which can be tightly closed by a filling device. To speed up the filling procedure of like brake systems, an additional connection is established between the supply reservoir (6) and the wheel brake (11) which is controllable by a valve (15). A like arrangement accelerates the venting and filling procedure, since the inlet valve (8) and its throttling action are by-passed.

Hydraulic brake system

A hydraulic motor vehicle brake system with a master cylinder (61) and a hydraulic power booster (24) connected upstream of the master cylinder (61), in which a pressure medium pump (1) which may be driven by an electric motor is used for providing an auxiliary hydraulic energy. The drive of the pressure medium pump (1) may be switched on by a pressure accumulator (26) which in the unbraked operation of the automotive vehicle is permanently kept on a pressure level sufficient for an initial actuation of the brake. The pressure accumulator (26) is charged by means of a pressure control valve (7) in which a valve passage (15, 17) is operable by a hydraulic pressure in the booster chamber (23) of the power booster (24) such as to ensure that upon pressurization of the booster chamber (23) a connection will be locked between the pressure accumulator (26) and the power booster (24). The power booster (24) has a pedal-operable throttle valve, with the throttle valve being a double seat valve which in the brake's release position will lock a connection from the pump (1) to the booster chamber (23).

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Walsdorf, Germany

Werner Volkmar