Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-12-11
1994-07-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303111, 3031162, 3031171, 3031191, 3031154, B60T 832
Patent
active
053302583
ABSTRACT:
The present invention is directed to a pressure control unit for a brake system that includes a master cylinder connected to brake circuits for a plurality of drive and follower wheels, each brake circuit being connected to a wheel cylinder through a main brake line. The pressure control unit for each of the drive wheels incorporates a selector valve, fitted in the main brake line on a master cylinder side of a connection between the main brake line and the delivery line, the selector valve being formed to switch to a closed state only during traction control operation; a reflux line which connects a master cylinder reservoir and the suction line; a switching valve installed in the reflux line, the switching valve being formed to switch to a free passage state between a master cylinder reservoir and the suction line during traction control operation; a relief valve, fitted across both the main brake line and the reflux line, wherein when the pressure from the delivery line reaches or exceeds a threshold level, the relief valve opens to exhaust excess hydraulic pressure of the delivery line to the reflux line, and at all other times the relief valve remains closed; and a check valve connected to the suction line on a working fluid reservoir side of a connection with the reflux line.
REFERENCES:
patent: 4618189 (1986-10-01), Nakanishi et al.
patent: 4703979 (1987-11-01), Nakanishi et al.
patent: 5165764 (1992-11-01), Miyake et al.
patent: 5213399 (1993-05-01), Burgdorf et al.
Fukuyo Kei
Hoshoya Yukio
Butler Douglas C.
Nissinbo Industries Inc.
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