Fluid pressure control apparatus for wheel brakes

Details Fluid pressure control apparatus for wheel brakes Fluid pressure control apparatus for wheel brakes

1997-08-11

1999-12-21

Butler, Douglas C.

Fluid-pressure and analogous brake systems

With pump

3031161, 3031191, 303900, 3031132, B60T 800

Patent

active

060039574

ABSTRACT:
The present invention aims to provide a fluid pressure control apparatus which allows the gradient of pressure increase to be adjusted finely without using any accumulator. The fluid pressure control apparatus of the present invention includes a hydraulic pump driven by a drive motor and a wheel brake. A first orifice is provided in a passage portion on the side of an outlet of the hydraulic pump. Another passage portion on the side of an inlet of the hydraulic pump is connected to the passage portion between the first orifice and the hydraulic pump through a return passage. A switching valve and a second orifice are connected in series along the return passage. The pressure increase gradient can be set to a small value by changing the amount of fluid flowing into the wheel brake. This is effected, for example, by changing the ratio of the fluid passage area of the first orifice to that of the second orifice, the operational speed of the hydraulic pump, or the duty ratio of the switching valve.

REFERENCES:
patent: 4844558 (1989-07-01), Ishii et al.
patent: 4900102 (1990-02-01), Jonner et al.
patent: 4988148 (1991-01-01), Farr et al.
patent: 5242216 (1993-09-01), Miyawaki et al.
patent: 5322352 (1994-06-01), Ohno et al.
patent: 5393132 (1995-02-01), Yogo et al.
patent: 5549366 (1996-08-01), Toda et al.

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