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US 4,230,377 AGranted
Pressure control valve unit
AssigneeRobert Bosch GmbH
InventorHermann J. Goebels
Life of this patent
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AssigneeRobert Bosch GmbH
InventorHermann J. Goebels
Estimating the term…
A pressure control valve unit for an anti-locking apparatus in motor vehicle wheel brakes which is actuatable by a control pressure which controls the brake pressure in at least one wheel brake cylinder, the pressure control valve unit having a pressure exchange chamber, which alternatively has brake cylinder pressure and atmospheric pressure, defined by a switching diaphragm and the switching diaphragm comprising the switching member of a relay valve on one side and on the side--like the closing body of a rapid-release valve--is provided the monitor member of a brake cylinder line leading to the outside air so that the pressure control valve unit combines the advantages of relay and switching valves without their disadvantages and the valve unit can be utilized in other fields, which can be accomplished by simple additional switching arrangements and which extend beyond the normal anti-locking protection function.
A pressure control valve unit for an anti-locking protection apparatus in motor vehicle wheel brakes control pressure means which is actuable in direct proportion to a reactive pressure in a pressure exchange chamber attachable on one side to a reserve supply line and on the other side to a relief point and which control pressure controls the brake pressure in at least one wheel brake cylinder, a valve unit housing, said pressure exchange chamber positioned in said valve unit housing, a switching diaphragm in said pressure exchange chamber, relay valve means having a switching member under control pressure on one side of said switching diaphragm and a monitor member for a brake cylinder line communicating with the outside air on the other side of said switching diaphragm.
Dependencies are inferred from the claim text.