Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-02-08
1987-02-17
Garrett, Robert E.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
60575, 60578, 60589, 60591, B60T 844, B60T 1108, F15B 708, F15B 700
Patent
active
046434895
ABSTRACT:
A hydraulic brake system with slip control, in particular for automotive vehicles, comprising a master cylinder (2) actuatable by a hydraulic power booster (1), in which brake system valve means (23, 24, 28, 29, 32, 33, 34, 35) are inserted between the master cylinder (2) and the wheel brakes (25, 26, 30, 31), connected to the master cylinder (2) which allow to remove pressure fluid from the wheel brakes (25, 26, 30, 31), while the pressure fluid taken from the wheel brakes (25, 26, 30, 31) can be replenished out of the pressure chamber (10) of the hydraulic power booster (1), wherein the master cylinder piston (5) is designed as a stepped piston and an annular surface (18) of the master cylinder piston (5) remote from the working chamber (16) is adapted to be acted upon by the pressure of the working chamber (16), and wherein the chamber (19) confined by the annular surface (18) is connectible to an unpressurized supply reservoir (11) by way of a travel-responsively controllable valve (51). For reducing wear of the annular seal (48) arranged at the master cylinder piston (5) and susceptibility of the valve (51) to dirt, an annular member (50) lying opposite to the annular surface (18) includes an axial channel (49) connectable with the reservoir (11). A resiliently preloaded sealing member (61) is supported at the port of the axial channel (49) and is adapted to lift from the port due to displacement of the master cylinder piston (5).
REFERENCES:
patent: 3557555 (1971-01-01), Wilson et al.
patent: 4072014 (1978-02-01), Gardner
patent: 4523791 (1985-06-01), Belart et al.
Reinartz Hans-Dieter
Steffes Helmut
Alfred Teves GmbH
Garrett Robert E.
Kapsalas George
Michals William J.
Raden James B.
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