Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-08-13
1987-03-24
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303111, B60T 810
Patent
active
046520619
ABSTRACT:
A hydraulic anti-skid apparatus for installation in a vehicle braking system includes a cut-off valve disposed within a braking circuit connecting a master cylinder to a wheel brake cylinder, a piston arranged to be applied at opposite ends thereof with a braking pressure from the master cylinder and a hydraulic power pressure from a power pressure source and being associated with the cut-off valve to open the cut-off valve while the power pressure is applied thereto and to be displaced by the braking pressure when released from the power pressure to close the cut-off valve and subsequently to increase a capacity downstream of the cut-off valve, a first changeover valve arranged to normally apply the power pressure to the piston and to exhaust the power pressure when a road wheel tends to be locked, and a second changeover valve arranged to permit the power pressure applied to the piston through the first changeover valve when the master cylinder is operated and to exhaust the power pressure therethrough when the master cylinder is released from its operation. The second changeover valve is loaded to maintain the pressure acting on the piston at a low level while the master cylinder is inoperative.
REFERENCES:
patent: 3722960 (1973-03-01), Von Lowis
patent: 3922021 (1975-11-01), Every
patent: 4453782 (1984-06-01), Arikawa et al.
Nishimura Takumi
Shibata Hirochika
Aisin Seiki Kabushiki Kaisha
Reger Duane A.
Toyota Jidosha & Kabushiki Kaisha
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