Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1992-05-04
1993-10-05
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
913692, 913693, 913694, F15B 910
Patent
active
052495043
ABSTRACT:
The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a piston (22) consisting of a rear tubular part (22) which supports a skirt (14) and which with the aid of an unwinding diaphragm (12) defines a front chamber (16) permanently connected to a vacuum source and a rear chamber (18) selectively connected to the front chamber (16) or to the atmosphere by a valve mechanism (20a, 32a, 40) actuated by a control rod (34) adapted to bear, by way of a plunger (32) sliding in a bore (30) of the piston (20), against one face of a reaction disk (58) fastened to a push rod (56), the valve mechanism (20a, 32a, 40) comprising a valve closure member (40) cooperating with a first valve seat (32a) formed on the plunger (32) and with a second valve seat (20a) formed on the piston (20 ), a retaining member (50), for the plunger (32) disposed in a radial space (38) in the piston (20) and having an inner end region extending the bore (30) of the piston (20) and forming a stop surface cooperating with axial abutment with a shoulder (74) on the plunger (32). According to the invention, the stop member (50) is permanently urged towards the rear by a resilient mechanism (66) to act in the closing direction on a second valve mechanism (64, 78).
REFERENCES:
patent: 4757749 (1988-07-01), Gautier
patent: 4765226 (1988-08-01), Bequet et al.
patent: 4777865 (1988-10-01), Gautier
patent: 4995302 (1991-02-01), Suzuki et al.
patent: 5029515 (1991-07-01), Endo
Gautier Jean-Pierre
Perez Miguel
Verbo Ulysse
Bendix Europe Services Techniques
Decker Ken C.
Look Edward K.
Mattingly Todd
Palguta Larry J.
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