Negative pressure booster equipment

Details Negative pressure booster equipment Negative pressure booster equipment

1989-09-19

1991-02-26

Capossela, Ronald C.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 91519, 91532, 92 48, F15B 910

Patent

active

049953028

ABSTRACT:
The negative pressure booster equipment according to the present invention is provided with a variable orifice, by which the area of the air passage in the pathways other than one pathway, of two or more pathways communicating two or more variable pressure chambers with atmospheric air, is gradually decreased as the valve plunger moves forward, and it is gradually increased as the valve plunger moves backward in relation to the valve body. Consequently, the pathways other than one pathway are throttled by the variable orifice as the valve plunger moves forward. As the result, most of the air flowing through the control valve is intensively introduced into the variable pressure chamber communicating with the pathway, which is not throttled by the variable orifice, and the pressure in this variable pressure chamber is rapidly increased. As the result, the power pistons under the pressure in this variable pressure chamber is quickly operated, and the rising of the output of the negative pressure booster equipment occurs earlier.

REFERENCES:
patent: 4494445 (1985-01-01), Furuta et al.
patent: 4512237 (1985-04-01), Endoh et al.
patent: 4594937 (1986-06-01), Meynier et al.
patent: 4653076 (1987-02-01), Satoh
patent: 4658704 (1987-04-01), Mori et al.
patent: 4718328 (1988-01-01), Mori et al.
patent: 4763561 (1988-08-01), Gautier

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