Brake booster with key member having an elastic member

Details Brake booster with key member having an elastic member Brake booster with key member having an elastic member

1988-10-27

1990-08-28

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

403155, 403326, F15B 910

Patent

active

049515500

ABSTRACT:
A brake booster is disclosed which reduces an idle stroke of an input shaft. A key member which is mechanically coupled to a valve plunger which forms part of a valve mechanism is provided with an elastic member so that when the brake booster is inoperative, the elastic member on the key member abuts against a shell and a valve body, respectively, thereby limiting a retracting movement of the valve body. Under this condition, a retracting movement of the key member is allowed by an elastic deformation of the elastic member if the input shaft is pulled rearward to cause a retracting movement of the valve plunger and the key member.

REFERENCES:
patent: 3110031 (1963-11-01), Price
patent: 3172334 (1965-03-01), Wuellner et al.
patent: 4437390 (1984-03-01), Ohta
patent: 4472997 (1984-09-01), Ohmi
patent: 4587885 (1986-05-01), Boehm et al.
patent: 4843948 (1989-07-01), Sugiura et al.
patent: 4846047 (1989-07-01), Uyama et al.
Drawings from U.S. application Ser. No. 07/868,816, filed May 29, 1986 (3 sheets).

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