Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1975-10-22
1977-03-15
Halvosa, George E. A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
B60T 8087
Patent
active
040120821
ABSTRACT:
An anti-skid hydraulic braking system for a vehicle having the usual wheel cylinders, master cylinder and brake pedal, with a brake release valve interposed ahead of each wheel cylinder for selectively reducing the pressure in the wheel cylinder in accordance with a slip signal generated at the associated wheel. For the purpose of generating a slip signal, positive displacement hydraulic pumps are coupled to the respective wheels, the pumps being connected in a series loop circuit charged with control fluid so that control fluid circulates idly at low pressure in the loop as long as the wheels rotate at the same speed, but with back pressure being developed at the input connection of a pump associated with a wheel which is in a relatively slipping condition of incipient skid. Each brake release valve has an inlet port connected to the master cylinder, an outlet port connected to the wheel cylinder, and a control port which is coupled to the input connection of the associated pump for receiving a pressure signal therefrom. The valve has a first or "signal" piston movable in response to the pressure and a second piston for creating a cavity for temporary accommodation of brake fluid from the wheel cylinder. When the pressure at the control port rises, signaling an incipient skid, movement of the signal piston first cuts off the inlet port to isolate the wheel cylinder from the rest of the regular braking system and then shifts the second piston to create a cavity for accommodating slight reverse flow of fluid from the wheel cylinder, thus releasing the brake sufficiently to avoid a skid.
REFERENCES:
patent: 2869687 (1959-01-01), Keim et al.
patent: 3004801 (1961-10-01), Wrigley
patent: 3093153 (1963-06-01), Horowitz
patent: 3264040 (1966-08-01), Brueder
patent: 3721475 (1973-03-01), Kawase et al.
patent: 3881783 (1975-05-01), Shiber
Halvosa George E. A.
Westinghouse Air Brake Company
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