Vacuum type brake booster

Details Vacuum type brake booster Vacuum type brake booster

1991-06-13

1993-03-16

Look, Edward K.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

913691, 91376R, F01B 2502

Patent

active

051934299

ABSTRACT:
A vacuum type brake booster includes a housing including a front shell and a rear shell in which a constant negative pressure chamber and a variable pressure chamber are defined by a power piston and a diaphragm, a partition for dividing the variable pressure chamber into a first variable chamber next to the constant negative pressure chamber and a second variable chamber, a normally opened valve mounted on the partition for establishing or interrupting of the fluid communication an output rod movable together with the power piston, an input rod for urging the output rod, a valve mechanism disposed with in the power piston to be operated by the input rod and used for controlling the differential pressure between the constant negative pressure chamber and the variable pressure chamber by controlling the fluid communication of the second variable chamber with the constant negative pressure chamber and the atmosphere and a normally closed valve mounted on a rear shell and the partition and disposed between the first variable chamber and the atmosphere.

REFERENCES:
patent: 3364818 (1968-01-01), Hager et al.
patent: 4759255 (1988-07-01), Shimamura
patent: 4800799 (1989-01-01), Nishii

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