Pneumatic brake booster with air guide surfaces

Details Pneumatic brake booster with air guide surfaces Pneumatic brake booster with air guide surfaces

1992-05-04

1994-01-18

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 92 99, F15B 910

Patent

active

052792030

ABSTRACT:
The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a piston (20) comprising a rear tubular part (22) and a movable wall (12) defining 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) against one face of a reaction disk (58) fastened to a push rod (56), the valve mechanism comprising a valve closure member (40) cooperating by an active part with a first valve seat (32a) formed on the plunger (32) and with a second valve seat (20a) formed on the piston (20). According to the invention, a guide mechanism (62) for the air in movement are provided upstream of the valve mechanism.

REFERENCES:
patent: 3387540 (1968-06-01), Wilson
patent: 3410179 (1968-11-01), Kytta et al.
patent: 3661054 (1972-05-01), Brown
patent: 4794844 (1989-01-01), Taft

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