Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-06-20
1987-02-17
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 303119, B60T 802
Patent
active
046434909
ABSTRACT:
A hydraulic servo vehicle brake is provided with a pedal-actuated master cylinder (11) and a first brake circuit I is connected to the pressure chamber (76) subjected to the pressure exerted by the master piston (24). Between the brake pedal (16) and the master piston (24), a brake application valve (17) is arranged which, on actuation by the brake pedal (16), applies pressure medium supplied by a hydraulic pump (18) connected with a fluid reservoir (27) in a controlled manner to the master piston. A wheel slip-brake control unit is provided which, in the event of incipient slip of a vehicle wheel, automatically reduces the brake power at the relevant vehicle wheel to a value just enabling the wheel to rotate and which comprises a switching valve (21) which is also subjected to the controlled pressure and is normally closed and opens at incipient slip of the associated vehicle wheel in order to apply the controlled pressure to the pressure chamber on which the master piston acts. The outlet (136) of the switching valve (21) is linked to the pressure chamber (76) subjected to the pressure exerted by the master piston (24) through a non-return valve (23) which opens when the pressure supplied form the outlet (136) of the switching valve (21) is higher than the pressure in the pressure chamber (76) and which is closed in any other condition. The master piston (24) succeeding the brake application valve (17) as well as the master cylinder (11) are provided with a stepped extension (24' and 11', respectively) in the direction of the pressure chamber (76) subjected to the pressure applied by the master piston (24). The pedal-retaining annular chamber (25) is normally connected with the fluid reservoir (27) through a pedal-retaining valve (26) controlled by the switching valve (21) and is sealed off from the atmosphere in the event of a wheel slip.
REFERENCES:
patent: 4036534 (1977-07-01), Kondo et al.
patent: 4354714 (1982-10-01), Belart
patent: 4416491 (1983-11-01), Belart et al.
patent: 4482190 (1984-11-01), Burgdorf et al.
Alfred Teves GmbH
Graham M. C.
Michals William J.
Raden James B.
Reger Duane A.
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