Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1980-08-27
1982-08-31
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188349, B60T 826
Patent
active
043469418
ABSTRACT:
An improved hydraulic pressure control valve device includes a valve housing having first and second inlet ports of the master cylinder, respectively, first and second inlet ports communicated with the left and right rear wheel brakes of the vehicle, respectively, a first control pressure chamber interconnecting the first inlet port and the first outlet port, a second control pressure chamber interconnecting the second inlet port and the second outlet port, and a cylinder bore interconnecting the first and the second outlet ports; a pressure reducing valve adapted to normally open the first control pressure chamber and to open and close the first control pressure chamber as the pressure at the first inlet port exceeds a predetermined level so as to transmit the pressure to the first outlet port while proportionally reducing the pressure; a cut-off valve adapted to normally open the second control pressure chamber in the normal state, a valve rod integrally connected to the reducing valve to operate the cut-off valve so that is closes the second control pressure chamber just before the closing of the pressure reducing valve; and a balance piston slidably fitting in the cylinder bore and adapted to move, when the pressure at the first outlet port is higher than that at the second outlet port, in the direction for achieving an equilibrium of these pressures.
REFERENCES:
patent: 3970347 (1976-07-01), Mizusawa
patent: 4198099 (1980-04-01), Oberthur
Butler Douglas C.
Nissin Kogyo Kabushiki Kaisha
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