Parking maintaining apparatus for brake booster

Details Parking maintaining apparatus for brake booster Parking maintaining apparatus for brake booster

1988-12-09

1989-11-28

Green, Randall L.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

913691, 192 135, 303 89, F15B 900

Patent

active

048829757

ABSTRACT:
A parking maintaining apparatus includes a solenoid-operated open/close valve which opens or closes a constant pressure passage providing a communication between a valve mechanism and a constant pressure chamber of a brake booster. A relief valve is provided which relieves a pressure within the constant pressure passage into the constant pressure chamber when such pressure exceeds a given value. The provision of the relief valve allows the pressure within a variable pressure chamber to be maintained at or below the given value through the valve mechanism under a parking maintaining condition, whereby the pressure within the variable pressure chamber can be rapidly displaced as the parking maintaining condition is to be terminated, thus eliminating a partly braked condition.

REFERENCES:
patent: 4660691 (1987-04-01), Messersmith et al.
patent: 4681196 (1987-07-01), Fulmer et al.
patent: 4759255 (1988-07-01), Shimamura
patent: 4800799 (1989-01-01), Nishii

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