Negative pressure type booster

Details Negative pressure type booster Negative pressure type booster

2006-06-20

2006-06-20

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C091S37600A

Reexamination Certificate

active

07063002

ABSTRACT:
In a negative pressure type booster, an atmospheric valve seat is formed on an annular disk of an input member, which disk extends radially outward. The annular disk and an annular diaphragm located frontward of the annular disk and mounted to the input member define an annular atmospheric chamber. The atmospheric chamber communicates with the atmosphere via an air hole formed in the annular disk. The diaphragm is supported from the front by a power piston. The diaphragm is a flexible member. Inner and outer circumferential portions of the flexible member are formed into respective rolling portions for allowing frontward/rearward movement of the input member by means of curviform deformation. An atmospheric control valve portion, which is seated on and separated from the atmospheric valve seat, and a vacuum control valve portion, which is seated on and separated from a vacuum valve seat formed on the power piston, are axially separated.

REFERENCES:
patent: 5704270 (1998-01-01), Tsubouchi
patent: 5904088 (1999-05-01), Ogura et al.
patent: 6709071 (2004-03-01), Fukami
patent: 6715401 (2004-04-01), Takasaki et al.
patent: 6755116 (2004-06-01), Tsubouchi et al.
patent: 8-310379 (1996-11-01), None

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