Brake booster with seal housing and key member

Details Brake booster with seal housing and key member Brake booster with seal housing and key member

1988-02-02

1989-07-11

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 921691, F15B 910

Patent

active

048460478

ABSTRACT:
A brake booster is disclosed which reduces an idle stroke of an input shaft, by bringing a key member which is mechanically coupled to a valve plunger into abutment against an inner wall surface of a shell when the brake booster is inoperative. The shell includes a cylindrical projection which extends rearwardly from the center thereof, and the cylindrical projection is formed with a flange which extends radially inward, with its inner periphery cut away to define an opening. A valve body includes a cylindrical portion which extends through the opening to the outside thereof. By disposing the key member for abutment against the inner wall surface of the flange, a reduction in the length of the key member is enabled. A seal member seals the cylindrical portion of the valve body, and is located rearwardly of the flange and is received within a housing which is disposed outside the shell.

REFERENCES:
patent: 2897789 (1959-08-01), Rosback
patent: 4397219 (1983-08-01), Belart
patent: 4469009 (1984-09-01), Takayama et al.
patent: 4472997 (1982-03-01), Ohmi
patent: 4487105 (1984-12-01), Harrison
patent: 4587885 (1986-05-01), Boehm et al.
patent: 4598624 (1986-07-01), Wagner
patent: 4643076 (1985-09-01), Satoh

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