Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1997-05-30
1999-08-31
Nguyen, Hoang
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, F15B 910
Patent
active
059439378
ABSTRACT:
A pressure differential operated brake booster includes a housing, a diaphragm assembly adapted to divide the interior of the housing into a constant pressure chamber and a variable pressure chamber, a valve body carried by the diaphragm assembly, a valve mechanism arranged within the valve body and including a plunger connected to an input rod, and a reaction assembly disposed between the plunger and an output rod. The valve mechanism is operable to develop a pressure differential across the diaphragm assembly to transmit its movement to the output rod and feed part of the resulting reaction force back to the input rod through the reaction assembly and the plunger. The reaction assembly includes a front reaction disk and a separate rear reaction disk having a diameter less than that of the front reaction disk and greater than that of the plunger. The front reaction disk is disposed between the valve body and the output rod. The valve body has at its front end a recess to receive the rear reaction disk. The plunger has a front end extending slightly into the recess.
REFERENCES:
patent: 4970940 (1990-11-01), Boehm et al.
patent: 5226291 (1993-07-01), Osterday et al.
patent: 5261313 (1993-11-01), Yared
patent: 5263398 (1993-11-01), Kobayashi et al.
patent: 5425302 (1995-06-01), Levrai et al.
Nguyen Hoang
Tokico Ltd.
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