Aisin Seiki Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Yoyota Jidosha Kabushiki Kaisha

Toyohisa Yamada

Hiroaki Takeuchi

Masamoto Ando

Toshihiko Yamanaka

Nobuyasu Nakanishi

Noboru Noguchi

A hydraulic anti-skid apparatus for automotive vehicles includes a cut-off valve disposed within a braking circuit connecting a master cylinder to a wheel brake cylinder, a bypass valve disposed within a bypass passage of the braking circuit, first and second pistons respectively arranged to control opening and closing operations of the cut-off valve and the bypass valve, the first and second pistons each being arranged to be applied at one end thereof with a hydraulic braking pressure from the master cylinder and at the other end thereof with a hydraulic power pressure from a fluid pump, a solenoid valve arranged to apply the power pressure to the first piston in its deactivated condition and to connect the first piston to a fluid reservoir in its activated condition, a regulator valve arranged to control the power pressure applied to the first and second pistons in accordance with the braking pressure applied thereto, the regulator valve including a booster piston assembly having a small diameter portion applied with the power pressure and a large diameter portion applied with the braking pressure. The regulator valve acts to cooperate with a check valve in response to movement of the booster piston assembly thereby to produce a hydraulic pressure at a higher value than the braking pressure.

Hydraulic anti-skid apparatus for automotive vehicles

A hydraulic anti-skid apparatus which includes a cut-off valve disposed within a braking circuit connecting a master cylinder to a wheel brake cylinder, a bypass valve disposed within a bypass passage of the braking circuit, first and second pistons respectively arranged to control opening and closing operations of the cut-off valve and the bypass valve, the first and second pistons each being arranged to be applied at one end thereof with a hydraulic braking pressure from the master cylinder and at the other end thereof with a hydraulic power pressure from a fluid pump, a solenoid valve arranged to apply the power pressure to the first piston in its deactivated condition and to connect the first piston to a fluid reservoir in its activated condition, and a regulator valve arranged to control the power pressure applied to the first and second pistons in accordance with the braking pressure applied thereto. The regulator valve is arranged acts to cooperate with a check valve in response to the braking pressure thereby to produce a hydraulic pressure at a higher value than the braking pressure. An orifice element is further arranged to throttle the flow of pressurized fluid supplied to the first piston through the regulator and solenoid valves to maintain the power pressure acting on the second piston.

An antiskid control apparatus for an automobile has a motor controlled by a computer for actuating a pump to produce a working fluid pressure in an antiskid control mode. In the antiskid control mode, fluid actuators coupled between a brake master cylinder and wheel cylinders of automobile wheels are controlled by the working fluid pressure to increase and reduce the fluid pressure applied to the wheel cylinders in a cyclic manner until the wheels are no longer subject to a skid.

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Anjo, Japan

Toyohisa Yamada