Anti-skid braking systems for vehicles
AssigneeLucas Industries Limited
InventorGlyn P. R. Farr
Life of this patent
Estimating the term…
Abstract
In a braking system a dump valve opens during an imminent skid condition to dump fluid from a brake circuit to a reservoir space. A reservoir piston defining a boundary of the reservoir space then moves in a first bore against a spring so that a control rod, integral with the reservoir piston, allows a ball valve member to engage with its seat to cut-off communication between a master cylinder and a wheel brake. Simultaneously, fluid flows from the reservoir space through an inlet valve to a working chamber of a pump provided in a second bore in the reservoir piston so that a pump piston working in the bore engages with a rotatable eccentric. Fluid is then pumped from the pump chamber, past an outlet valve through an outlet passage in the control rod, and returned to the reservoir space through the open dump valve.
Claims14
An anti-skid braking system for a vehicle comprising a brake circuit including a wheel brake, an hydraulic master cylinder connected to said brake circuit, a modulator assembly comprising a housing having a first bore, a reservoir piston, a reservoir space bounded by said reservoir piston, and a dump valve responsive to a skid signal for dumping fluid from said brake circuit to said reservoir space, a pump for recovering fluid from said reservoir space and comprising a pump displacement member, a pump chamber bounded by said pump displacement member, and driving means for said pump displacement member, an inlet passage to said pump chamber from said reservoir space, and an outlet passage from said pump chamber to said brake circuit, said reservoir piston being slidable in said first bore and being provided with a second bore, said pump chamber being provided in said second bore in said reservoir piston, and said pump displacement member being sealed to the wall of said second bore.
Dependencies are inferred from the claim text.