Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-12-20
1989-07-11
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, 303116, B60T 842
Patent
active
048465330
ABSTRACT:
An anti-lock hydraulic braking system includes a copy valve which is connected between two independent braking circuits, each incorporating a wheel brake and a respective one pressure space of a tandem master cylinder. The copy valve comprises a housing having a multi-stepped bore in which a piston of complementary outline is located, first and second inlet chambers connected to the respective pressure spaces, and first and second outlet chambers connected to respective brakes, are all defined between the piston and the bore. A valve assembly is adapted to control communication between the inlet chamber and the first output chamber, and between the output chamber and first expander chamber. The other output chamber is connected to a second expander chamber through an anti-lock modulator. The piston is arranged so that only a relatively small axial travel is required to operate the valve assembly, and such movement can be accommodated by flexure of seals on the piston.
REFERENCES:
patent: 4457563 (1984-07-01), Farr
patent: 4637664 (1987-01-01), Arikawa
patent: 4700991 (1987-10-01), Nishimura et al.
patent: 4740039 (1988-04-01), Hattwig
Lucas Industries Public Limited Company
Reger Duane A.
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