Vehicle anti-skid braking systems

Details Vehicle anti-skid braking systems Vehicle anti-skid braking systems

1988-03-21

1989-04-18

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

188344, 188181A, 303115, 303110, B60T 840, B60T 1370

Patent

active

048221155

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: 4350396 (1982-09-01), Mortimer
patent: 4353440 (1982-10-01), Farr
patent: 4421359 (1983-12-01), Hayashi et al.
patent: 4457563 (1984-07-01), Farr
patent: 4465322 (1984-08-01), Hayashi
patent: 4474413 (1984-10-01), Farr
patent: 4648664 (1987-03-01), Yardley
patent: 4660683 (1987-04-01), Hayashi et al.
patent: 4664233 (1987-05-01), Tsuchida et al.
patent: 4673221 (1987-06-01), Hayashi et al.
patent: 4730705 (1988-03-01), Farr

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