Negative pressure type booster device

Details Negative pressure type booster device Negative pressure type booster device

2006-08-15

2006-08-15

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C091S37600A

Reexamination Certificate

active

07089846

ABSTRACT:
A negative pressure type booster device possesses a valve mechanism constructed to compensate for insufficient depressing force applied to a brake pedal upon emergency braking. Upon depression of the brake pedal, first negative pressure valves contact first negative pressure valve seats to block a variable pressure chamber from communication with a constant pressure chamber, and an atmosphere valve seat is separated from an atmosphere valve to communicate the variable pressure chamber with atmosphere. A partition member thus moves forwards depending on the pressure difference between the chambers to output a propelling force from an output rod. When the brake pedal is stepped on quickly, a valve member is urged backwards by a spring member causing second negative pressure valve seats to contact second negative pressure valves and move the valve member backwards. The atmosphere valve separates from the atmosphere valve seat, and the variable pressure chamber quickly communicates with atmosphere.

REFERENCES:
patent: 4633760 (1987-01-01), Wagner
patent: 5483866 (1996-01-01), Schluter
patent: 5839344 (1998-11-01), Tsubouchi
patent: 6067891 (2000-05-01), Gautier et al.
patent: 6389951 (2002-05-01), Castel et al.
patent: 6755116 (2004-06-01), Tsubouchi et al.
patent: 1 227 020 (2002-07-01), None

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