Brake booster

Details Brake booster Brake booster

1980-09-30

1983-01-04

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91369B, F15B 910

Patent

active

043667449

ABSTRACT:
A brake booster of stroke-enlarging type wherein the brake feeling is improved. The brake booster includes a casing, a power piston disposed in said casing so as to divide the interior of the casing into two chambers for being actuated by the pressure difference in the two chambers, and a control piston having a built-in control valve for controlling the pressure difference due to the operation of an input member. The power piston is so disposed as to be relatively movable for a predetermined distance with respect to the control piston and able to be advanced at the initial stage of the braking operation relative to the control piston at a stroke, independently of the amount of advancement of the input member, for the predetermined distance in order to give an output member a larger output stroke than stroke input. At least on one of the mutual abutting surfaces abutting to each other for restricting the end position of the relative movement for the predetermined distance of the power piston to the control piston a shock-absorbing member of rubber material is fixed.

REFERENCES:
patent: 2894490 (1959-07-01), Ingres
patent: 3661054 (1972-05-01), Brown
patent: 4192220 (1980-03-01), Tateoka
patent: 4242943 (1981-01-01), Nakamura et al.

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