Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1997-07-16
1998-08-18
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
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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Inoue Hidefumi
Saito Naohito
Jidosha Kiki Co. Ltd.
Lopez F. Daniel
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