Brakes – Operators – Fluid pressure
Patent
1981-11-19
1983-12-20
Butler, Douglas C.
Brakes
Operators
Fluid pressure
188290, 303 10, B60T 1110
Patent
active
044212127
ABSTRACT:
An arrangement for controlling the pressure of a hydraulic braking fluid supplied to a brake actuating cylinder includes an elongated hollow valve member mounted for axial movement in a bore of a housing. A compression spring acts on the valve member in one axial direction, and a control piston acts on the valve member in the opposite axial direction. Control pressure is admitted into an actuating compartment to act on the control piston and via the same on the valve member. The valve member forms a first valve arrangement with the control piston and a second valve arrangement with a part which is rigid with the housing. The first and second valve arrangement respectively controlled the communication of a slave unit with a low-pressure supply reservoir and with an actuating pressure source. The compression spring urges the valve member toward a position in which the first valve arrangement is open and the second valve arrangement is closed. An auxiliary spring acts on the compression spring via an auxiliary piston, a tappet and a transmission member, to augment the force of the compression spring. The control pressure is supplied upon brake actuation to the auxiliary piston to exert a hydraulic force thereon which reduces the auxiliary spring force which is transmitted to the compression spring. The sealing edge diameter of the second valve arrangement is greater than the sealing edge diameter of the first valve arrangement.
REFERENCES:
patent: 3423136 (1969-01-01), Lohbauer
patent: 3901562 (1975-08-01), Powell et al.
patent: 4027922 (1977-06-01), Schlicker
patent: 4236763 (1980-12-01), Resch
Butler Douglas C.
Chaban Marvin M.
IT&T Industries, Inc.
Raden James B.
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