Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1997-09-26
1999-05-18
Ryznic, John E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B9/10
Patent
active
059040882
ABSTRACT:
A vehicle brake booster apparatus includes a housing, a movable wall positioned within the interior of the housing to divide the interior into a constant pressure chamber and a variable pressure chamber, a power piston connected to the movable wall for moving in response to movement of the movable wall, an axially movable input rod extending outwardly from the power piston for connection to a brake pedal, and an axially movable valve plunger mounted within the power piston and operatively connected to the input rod. A control valve is positioned within the power piston for controlling communication of the variable pressure chamber with atmospheric air. The control valve includes an air control valve and a vacuum control valve, with the air control valve including an air control seal arranged between the valve plunger and a valve body portion of the control valve. The air control seal has a radially outwardly located peripheral portion which possesses an elasticity that is greater than the elasticity of a radially inwardly located portion of the air control seal to thereby provide an effective air-tight seal.
REFERENCES:
patent: 5520086 (1996-05-01), Ikeda
patent: 5590578 (1997-01-01), Ikeda
patent: 5651300 (1997-07-01), Ikeda et al.
patent: 5704271 (1998-01-01), Ikeda
patent: 5782159 (1998-07-01), Gautier et al.
patent: 5826484 (1998-10-01), Gautier et al.
Ogura Osamu
Sato Ken'ichi
Aisin Seiki Kabushiki Kaisha
Ryznic John E.
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