Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1996-12-23
1999-10-26
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 15, 303 28, B60T 800
Patent
active
059714980
ABSTRACT:
Electropneumatic brake control valve for control of brakes on a railway vehicle. It has a supply valve and release valve moved by a common displaceable actuator. The supply valve connects an air supply passage to a delivery passage and the release valve connects the delivery passage to an exhaust. The delivery passage is for supplying air to a brake shoe application device. The invention has a feedback space having pressure connection to the delivery passage. A portion of the common displaceable actuator is located within the feedback space, as is a positioner for the common displaceable actuator. The positioner has at least three force and displacement communication portions. The first communicates a first force and a first displacement with the common displaceable actuator. The invention has a pressure defining member which defines pressure by its position. It communicates a second force and a second displacement with the second one of the force and displacement communication portions. The invention has a pressure regulator which has a regulating member communicating a third force and a third displacement with the third one of the force and displacement communication portions. The regulator moves in accordance with a comparison between the air pressure in the feedback space and a force exerting device. The force exerted by the force exerting device is dependent on the third displacement. The invention also has apparatus for positioning the pressure defining member, this apparatus controlled by electrical signals from a brake control system of the railway vehicle.
REFERENCES:
patent: 3692365 (1972-09-01), Demarez et al.
patent: 3814483 (1974-06-01), Coiner et al.
patent: 4162107 (1979-07-01), Bazelevich et al.
patent: 5064251 (1991-11-01), Romansky
Graham Matthew C.
Torres Melanie
Westinghouse Air Brake Company
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