Automatic brake booster

Details Automatic brake booster Automatic brake booster

1999-01-19

2000-07-04

Lopez, F. Daniel

Motors: expansible chamber type

Working member position feedback to motive fluid control

Plural input signal means for single motor valve

91376R, F15B 909, F15B 910

Patent

active

060822414

ABSTRACT:
An automatic brake booster includes a solenoid which drives a plunger, forming part of a valve mechanism, forward to switch a flow path in the valve mechanism, separately from an input shaft. A piston is mounted on the plunger, and the atmospheric pressure is introduced into an atmospheric pressure chamber disposed forwardly of the piston while a pressure which prevails in constant pressure chambers A, C is introduced into a negative pressure chamber disposed rearwardly of the piston, thus urging the piston rearward. Preferably, the piston has a pressure responsive area which is substantially equal to the pressure responsive area of an atmosphere valve seat formed on a plunger. This arrangement allows a variation in the output from the brake booster to be minimized or reduced substantially to zero if there is a variation in the magnitude of a negative pressure which is introduced into the constant pressure chambers A, C.

REFERENCES:
patent: 2862366 (1958-12-01), Ingres et al.
patent: 2976846 (1961-03-01), Stelzer
patent: 5096267 (1992-03-01), Volz
patent: 5802952 (1998-08-01), Ikeda

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