Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1991-03-18
1992-05-26
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91533, 92 48, 92 96, F15B 910
Patent
active
051157195
ABSTRACT:
A pneumatic booster for use, for example, in a brake system of a vehicle, and designed so that the overall axial length is reduced without interfering with the operation thereof. The booster comprises a valve body which is movable back and forth between first and second positions in a housing that is divided by a diaphragm with a power piston into front and rear chambers communicated with respective pressure sources, a valve which allows at least one of the front and rear chambers to selectively communicate with the pressure sources which differ from each other in the level of pressure, and a guide which slidably fits on the outer periphery of the valve body. The valve body has a passage one end of which opens on the outer periphery thereof to connect one of the front and rear chambers to the associated pressure source, the opening of the passage being positioned in the axial direction of the valve body so that the guide overlaps the opening when the valve body is at either the first or second position. The guide has a guide member and a seal member. The guide member has a plurality of axial grooves provided in the inner periphery thereof at predetermined spacings in the circumferential direction so that the passage communicates with the one chamber through the grooves when the valve body is at either the first or second position where the guide overlaps the opening.
REFERENCES:
patent: 4664016 (1987-05-01), Tobisawa et al.
patent: 4787292 (1988-11-01), Tsuyuki et al.
patent: 4944214 (1990-07-01), Briggs
patent: 4995302 (1991-02-01), Suzuki et al.
patent: 5029515 (1991-07-01), Endo
patent: 5046399 (1991-09-01), Koshimizo
Look Edward K.
Nguyen Hoang
Tokico Ltd.
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