Brake booster

Details Brake booster Brake booster

1991-07-03

1992-06-16

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

913694, 91376R, F15B 910

Patent

active

051216744

ABSTRACT:
An improvement of a variable pressure passage formed in the valve body of a brake booster is disclosed. A variable pressure passage including a first radial passage in which a key member is inserted and a second radial passage continuing from and located rearward of the first radial passage is the basis of the invention. According to the invention, a third radial passage, which also forms the variable pressure passage, is located forwardly of and continues from the first radial passage, and has a circumferential width less than that of the key member. This allows a corresponding increase in the channel area of the variable pressure passage, thereby improving the operational response of the brake booster without the need to increase the axial size of the valve body since the third passage is formed forwardly of the key member.

REFERENCES:
patent: 3143927 (1964-08-01), French et al.
patent: 4587885 (1986-05-01), Boehm et al.
patent: 4643076 (1987-02-01), Satoh
patent: 5031404 (1991-07-01), Flory et al.
patent: 5062348 (1991-11-01), Gotoh et al.

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