Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-12-05
1992-12-01
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 842, 303 11, 251 612, B60T 1320
Patent
active
051674432
ABSTRACT:
The brake system comprises two hydraulic sub-circuits, each connecting a driving wheel and a free wheel to a working chamber of a master cylinder (1) connected to a general reservoir (20) of fluid under low pressure, and including a wheel anti-lock braking device comprising a three-way solenoid valve (51, 52, 53, 54) normally opening communication between an inlet of fluid under pressure and the brake motor, while, in the expansion phase of the anti-lock device, it closes this communication and connects the brake motor to a reservoir (21, 22) of fluid under low pressure to each sub-circuit. The device comprises a differential valve slide consisting of a valve of which one face receives the pressure prevailing in the associated brake motor (31, 32, 33, 34) and the other that as generated by a pump (45, 46) and, at rest, putting in communication the working chamber of the master cylinder (1) and the inlet of fluid under pressure. The valve slide isolates the brake motor from the working chamber of the master cylinder during the operation of the pump (45, 46). A differential pressure/underpressure valve (76, 77) associated with each free wheel closes, at rest, communication between the working chamber of the master cylinder and the suction inlet of the pump (45, 46), and opens this communication in the event of underpressure in the corresponding brake motor (31, 33) only when there is no pressure generated by the master cylinder (1).
REFERENCES:
patent: 3741247 (1973-06-01), Kaemmer
patent: 4793663 (1988-12-01), Ocvirk et al.
patent: 4838620 (1989-06-01), Sypniewski
patent: 4883328 (1989-11-01), Burgdorf et al.
patent: 5028096 (1991-07-01), de la Broise
Bendix Europe Services Techniques
Decker Ken C.
Graham Matthew C.
Palguta Larry J.
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