Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-06-26
1994-05-17
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 11, 303900, B60T 1318
Patent
active
053121759
ABSTRACT:
The present invention relates to a brake fluid pressure control apparatus in which a casing contains a pump communication port separately from a master cylinder communication port. A spool is also provided which limits the communication between the pump communication port and the master cylinder communication port in a manner such that the discharge pressure from the pump is not added directly to the master cylinder. Additionally, in the intake and discharge sides of the pump, a bypass channel is provided. In this bypass channel, a relief valve is provided which allows the escape of pressure force to the intake side of the pump in the case when the pressure force between the discharge side of the pump and the flow control increases to a high pressure. Furthermore, because the brake fluid is normally designed to be discharged from the pump to the flow control valve at approximately a fixed flow rate by means of the relief valve, there is no return of brake fluid to the master cylinder via the flow control valve, and stroke fluctuations of the master cylinder can be eliminated. Additionally, the necessity for providing an orifice between a pump communication port and the master cylinder communication port disappears.
REFERENCES:
patent: 4362339 (1982-12-01), Belart
patent: 4395073 (1983-07-01), Arikawa et al.
patent: 4715666 (1987-12-01), Farr
patent: 4915459 (1990-04-01), Hashida et al.
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patent: 4988148 (1991-01-01), Farr et al.
patent: 5114216 (1992-05-01), Tsuda et al.
patent: 5221129 (1993-06-01), Takasaki
Ando Hiromi
Matsunaga Kunihiro
Sano Kenji
Suga Satoru
Muratori Alfred
Oberleitner Robert J.
Tokico Ltd.
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