Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1993-09-21
1995-01-10
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188349, 303 975, B60T 830
Patent
active
053800737
ABSTRACT:
A dual circuit brake valve system comprises first and second brake circuits, first and second combined inlet and outlet valves through which first and second braking pressures respectively are delivered to said first and second brake circuits, and first and second pistons which actuate the first and second combined inlet and outlet valves respectively. The second piston is actuated by the first braking pressure which serves as a control pressure therefor. To achieve simultaneous actuation of the first and second combined inlet and outlet valves, a compression spring is installed between the first and second pistons and mechanically connects these to each other. Thereby, a pressure difference of .DELTA.p between the pressure in the first brake circuit and the pressure in the second brake circuit, which approaches zero, is achieved. In order to be able to increase the pressure difference .DELTA.p in the two brake circuits, a third piston is provided between the first and second pistons. The third piston is subjected to braking pressure from the first brake circuit in such a manner that the third piston compresses the compression spring when a predetermined level of pressure is reached in the first brake circuit, thereby causing the mechanical connection between the first piston and the second piston to be suspended.
REFERENCES:
patent: 3804468 (1974-04-01), Ishikawa et al.
patent: 4274518 (1981-06-01), Berisch
patent: 4335736 (1982-06-01), Maehara et al.
patent: 4365845 (1982-12-01), Aouo
patent: 4660894 (1987-04-01), Bartholomew et al.
Bartscher Peter
Martini Gerhard
Pohl Wolfgang
Sandmann Jurgen
Muratori Alfred
Oberleitner Robert J.
WABCO Standard GmbH
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