Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1996-12-26
1998-08-04
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B 910
Patent
active
057877890
ABSTRACT:
The present invention is directed to a vacuum servo unit which is characterized in that a movable power piston has an outer cylindrical portion, an inner cylindrical portion, and a connecting portion for connecting an inner cylindrical portion to an outer cylindrical portion, the connecting portion has an input side end portion being shaped to be convex towards an input side so that a width in a peripheral direction thereof decreases towards the input side, a first path is provided in the connecting portion for communicating the variable pressure chamber with an inside space of the inner cylindrical portion, a second path is provided in the movable power piston for communicating the constant pressure chamber with the space between the outer cylindrical portion and the inner cylindrical portion. Accordingly, this vacuum servo unit can smoothly decrease the servo force for the movable power piston and the output force and restrain the production of the sound.
REFERENCES:
patent: 3150493 (1964-09-01), Rike
patent: 3249021 (1966-05-01), Wuellner
patent: 4350076 (1982-09-01), Thiel
patent: 4718328 (1988-01-01), Mori et a.
patent: 4729286 (1988-03-01), Blot
patent: 5337650 (1994-08-01), Uyama
Aisin Seiki Kabushiki Kaisha
Lopez F. Daniel
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