Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1992-04-10
1993-08-10
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, 92 99, F15B 910
Patent
active
052339041
ABSTRACT:
The invention relates to a pneumatic brake booster comprising a casing (10), within which is located a piston (22, 14, 102) formed from a rear tubular part (22) supporting a skirt and which, by way of an unrolling diaphragm (12), defining a front chamber (16) connected permanently to a vacuum source and a rear chamber (18) connected selectively to the front chamber (16) or to the atmosphere by a valve mechanism (136, 138, 140) actuated by a control rod (34) capable of bearing, by way of the front face (32b) of a plunger (32), on the rear face (58a) of a reaction disk (58) fixed to a push rod (56), a spring (150) for the return of the control rod (34) being arranged between the skirt (14) of the piston and the plunger (32), the valve mechanism (136, 138, 140) comprising a shutter (138) made rigid by an insert (118) and interacting by an active part with a first valve seat (136) formed on the plunger (32) and with a second valve seat (140) formed on the piston (14), the shutter (138) being formed by a flexible tubular diaphragm (114), the active part of the shutter (138) being located between the two ends (112, 116) of the flexible tubular diaphragm (114). According to the invention, the plunger (32) comprises a front part (126), an active part (128) displaceable in translational motion relative to the front (126) and a rear part (124) screwed to the front part (126).
REFERENCES:
patent: 3807280 (1974-04-01), Green et al.
patent: 4487105 (1984-12-01), Harrison
patent: 4794844 (1989-01-01), Taft
Gautier Jean-Pierre
Verbo Ulysse
Bendix Europe Services Techniques
Decker Ken C.
Look Edward K.
Nguyen Hoang
Palguta Larry J.
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