Vacuum booster with low force loss

Details Vacuum booster with low force loss Vacuum booster with low force loss

2007-05-15

2007-05-15

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C091S369100, C091S415000

Reexamination Certificate

active

11214132

ABSTRACT:
A vacuum booster includes a housing defining a control volume in which a movable diaphragm separates the control volume into an apply chamber and a vacuum chamber. A power piston extends through and engages the diaphragm and has an axial bore containing a valve assembly that controls a diaphragm pressure differential across the diaphragm. The power piston drives an output rod in the forward direction. The output rod has a rearward portion exposed to pressure within the vacuum chamber and a forward face exposed to atmospheric pressure. When the pressure within vacuum chamber is less than atmospheric, a piston pressure differential across the power piston provides a return force in the rearward direction to the power piston.

REFERENCES:
patent: 3237526 (1966-03-01), Hayes et al.
patent: 4345506 (1982-08-01), Ohomi

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