Hydraulic brake system

Details Hydraulic brake system Hydraulic brake system

1980-11-10

1982-07-20

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

188345, 303119, B60T 802

Patent

active

043402577

ABSTRACT:
Hydraulic brake systems are known including a master cylinder, wheel brake cylinder and antiskid control apparatus in which a fluid flow from a fluid source to the pressure chamber of the master cylinder is controlled by a valve device. The antiskid control apparatus activate valves to modulate the pressure in the associated wheel cylinders in the event of an imminent locked condition of a wheel. The known valve devices are complicated and do not permit determining the operability of the brake system before reaching a change-over point. To obviate these disadvantages, the valve device of the present invention feeds pressure from an auxiliary circuit in case of a corresponding decline in pressure from the master cylinder to the wheel cylinders. In the inactive state of the valve device, a pressure fluid connection is opened between a chamber defined by a booster piston and a fluid reservoir and this connection is closed upon actuation of the valve device, i.e. pressure is built up in a chamber locates at the end of the booster piston which has a closed connection to the valve device.

REFERENCES:
patent: 3827759 (1974-08-01), Belart
patent: 3877756 (1975-04-01), Inada et al.
patent: 3942844 (1976-03-01), Inada et al.
patent: 3979153 (1976-09-01), Ingram et al.

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