Pneumatic booster

Details Pneumatic booster Pneumatic booster

1994-06-15

1996-09-24

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

F15B 910

Patent

active

055580017

ABSTRACT:
A pneumatic booster has a valve member arranged to operate stably even under a large differential pressure. The inside of a housing is divided into a constant-pressure chamber and a variable-pressure chamber by a diaphragm. A plunger and a valve member are disposed in a valve body supported by the diaphragm such that the plunger and the valve member are slidable relative to each other. The valve member is formed from a rigid reinforcing member and an elastic member bonded to the reinforcing member. The plunger is movable in association with an input shaft. The movement of the plunger is transmitted to the valve member through a valve spring, causing the valve member to separate from a seat portion provided on the plunger. Thus, compressed air is introduced into the variable-pressure chamber from a pneumatic device through passages to produce a differential pressure between the variable-pressure chamber and the constant-pressure chamber, which is supplied with a negative pressure from an engine, thereby driving the valve body.

REFERENCES:
patent: 4825750 (1989-05-01), Rudiger et al.
patent: 5263399 (1993-11-01), Flory et al.

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