Vacuum brake booster shell extension with radially inwardly proj

Details Vacuum brake booster shell extension with radially inwardly proj Vacuum brake booster shell extension with radially inwardly proj

1988-10-27

1990-06-26

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

F15B 910

Patent

active

049361953

ABSTRACT:
A brake booster includes a key member coupled to a valve plunger. When the booster is inoperative, the key member is brought into abutment against an inner wall surface of a shell to limit a free retracting movement of a valve plunger and its connected input shaft so that a lost stroke of the input shaft can be reduced when the brake is operative for the next time. According to the invention, a shell includes a cylindrical extension which is circumferentially and integrally formed with an annular bulge which extends radially inward, with a seal member disposed on the rear side of the annular bulge.

REFERENCES:
patent: 4472997 (1984-09-01), Ohmi
patent: 4534270 (1985-08-01), Nishii
patent: 4587885 (1986-05-01), Boehm et al.
patent: 4643076 (1987-02-01), Satoh
patent: 4663757 (1987-01-01), Kubota
patent: 4664016 (1987-05-01), Tobisawa et al.
patent: 4747336 (1988-05-01), Uyama
patent: 4757748 (1988-07-01), Kawasumi et al.
patent: 4803912 (1989-02-01), Nishii
patent: 4846047 (1989-07-01), Uyama et al.

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