Vehicle anti-skid braking systems with pump plunger of different

Details Vehicle anti-skid braking systems with pump plunger of different Vehicle anti-skid braking systems with pump plunger of different

1986-12-01

1988-09-27

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

188181R, 303116, 303119, B60T 842

Patent

active

047737158

ABSTRACT:
In a vehicle anti-skid hydraulic braking system of the pump/re-apply type the pump plunger is of differential outline and works in a stepped bore. An annular chamber and a full pump chamber are defined in the bore on opposite sides of the head of the piston. The annular chamber is pressurized by fluid at a pressure dependent on the difference in pressure between the master cylinder and the brake, and the chamber is subjected to the pressure in the annular chamber in one direction and the pressure in the master cylinder in the opposite direction. The system is therefore provided with a pump which forces fluid back to the master cylinder but with torque levels similar to a pump which acts against brake pressure.

REFERENCES:
patent: 4340258 (1982-07-01), Farr
patent: 4457563 (1984-07-01), Farr
patent: 4648664 (1987-03-01), Yardley

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