Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1992-03-30
1993-08-10
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B 910
Patent
active
052339076
ABSTRACT:
The invention relates to a pneumatic brakebooster possessing a casing (10), within which is located a piston (22, 14, 102) formed from a rear tubular part (22) supporting a skirt (14) and, with the aid 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 a plunger (32) on one of the faces of a reaction disk (58) fixed to a push rod (56), a return spring (150) for the control rod (34) being arranged between the skirt (14) of the piston and the plunger (32), the valve mechanism (136, 138, 140) possessing a shutter (138) interacting by an active part made rigid by an insert (118) 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 shutter (138) possesses orifices (120) allowing communication between the front chamber (16) and the rear chamber (18).
REFERENCES:
patent: 3149539 (1964-09-01), Prather
patent: 4598548 (1986-07-01), Wagner
Gautier Jean-Pierre
Verbo Ulysse
Bendix Europe Services Techniques
Decker Ken C.
Look Edward K.
Lopez F. Daniel
Palguta Larry J.
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