Reaction mechanism for brake booster

Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type

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F15B 910

Patent

active

057945063

ABSTRACT:
A valve plunger, which forms part of a reaction mechanism of a brake booster, comprises a plunger member and a valve side member which are disposed to be slidable relative to each other, with a first spring disposed therebetween. A piston is slidably disposed within a valve body, and a given clearance is formed between the rear end face of the plunger member and the piston. A second spring having a greater resilience than the first spring is disposed between the piston and the valve body, and is compressed after the first spring is initially compressed. With this construction, as a brake reaction increases, the first spring is compressed to cause the plunger member to abut against the piston, and subsequently the first and second spring are compressed. A point where the compression of the first spring is initiated can determine a point where a servo ratio is changed, and the magnitudes of the resilience of the both springs permit an arbitrary choice of a servo ratio which prevails subsequent to the point where the servo ratio is changed.

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patent: 5425302 (1995-06-01), Levrai et al.
patent: 5642652 (1997-07-01), Inoue et al.
patent: 5699713 (1997-12-01), Mortimer

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