Pneumatic brake booster piston with sleeve defining quick-fill i

Details Pneumatic brake booster piston with sleeve defining quick-fill i Pneumatic brake booster piston with sleeve defining quick-fill i

1987-07-30

1990-07-24

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Pulsator

60578, B60T 1310, B60T 1352, B60T 1356

Patent

active

049427385

ABSTRACT:
In a booster casing (12) a movable wall (14) separates two compartments (16,18) from each other. In inoperative position, a control valve (20) connects the two compartments (16,18) with each other, and separates them when in an operative position, connecting one (16) of them to a source of pressure which differs from the pressure in the other compartment (18). A cylinder casing (52) is attached to the booster casing (12), projects into the same, and contains at least one pressure piston (54) which defines a pressure chamber (56) for pressurizing a brake circuit. An input piston (40) having a greater effective surface than the pressure piston (54) and defining an input chamber (42) is movable together with the movable wall (14). The input chamber (42) is adapted to be relieved of pressure by a relief valve (80) if the booster (10) fails. The input piston (40) and chamber (42) are arranged inside the booster casing (12), and the input piston (40) forms part of the movable wall (14). This permits a simple design of the assembly which is particularly space-saving, with a given specification of its performance.

REFERENCES:
patent: 2458803 (1949-01-01), Stelzer
patent: 3937021 (1976-02-01), Sisco et al.
patent: 4417445 (1983-11-01), Furuta
patent: 4446699 (1984-05-01), Fujii
patent: 4450688 (1984-05-01), Boehm
patent: 4475444 (1984-10-01), Hendrickson
patent: 4481865 (1984-11-01), Becht
patent: 4649707 (1987-03-01), Belart
patent: 4702077 (1987-10-01), Lilley et al.

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