Negative pressure type booster device

Details Negative pressure type booster device Negative pressure type booster device

2008-05-13

2008-05-13

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C091S37600A

Reexamination Certificate

active

07370571

ABSTRACT:
In a negative pressure type booster device, secondary passages53communicating directly with the atmosphere is formed between the internal surface of a sliding cylindrical portion8bof a valve piston8and the external surface of a silencer27, and communication means60is provided for being controlled to vary its path area in dependence on the advance amount of an input rod23when the same is moved beyond a predetermined distance relative to the valve piston8. Thus, when a brake pedal25is stepped on strongly, the atmospheric air can be led from the secondary passages53through the communication means60to a variable pressure chamber6, so that the property of the responsiveness in braking operation can be improved to a responsiveness enhancing property which varies in dependence on the manner of stepping the brake pedal25.

REFERENCES:
patent: 5056413 (1991-10-01), Kaub
patent: 6-24922 (1994-04-01), None
patent: 2004-359050 (2004-12-01), None

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