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
052339084
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 (14) and, 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 a plunger (32) on one of the faces of a reaction disk (58) fixed to a push rod (56), the valve mechanism (136, 138, 140) possessing 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), a stop member (152) determining simultaneously the rest position of the piston (22, 14, 102) and the rest position of the plunger (32). According to the invention, the piston (22, 14, 102) comprises, furthermore, an intermediate piston web (102) defining with the skirt (14) of the piston an annular volume (123), the first (136) and second (140) valve seats and the shutter (138) are arranged in the annular volume (123), and the second valve sheet (140) is formed on the skirt (14) of the piston.
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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