Pneumatic brake booster with improved response time

Details Pneumatic brake booster with improved response time Pneumatic brake booster with improved response time

1992-05-04

1993-10-05

Graham, Matthew C.

Brakes

Operators

Fluid pressure

91376R, B60T 1356

Patent

active

052496511

ABSTRACT:
The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a piston (20) consisting of a rear tubular part (22) which supports a skirt (14) and which with the aid of an unwinding diaphragm (12) defines 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 (20a, 32a, 40) comprising a valve closure member (40) cooperating 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, the plunger (32) and the piston ( 20) are provided with a second valve mechanism (65, 70).

REFERENCES:
patent: 3017866 (1962-01-01), Stelzer
patent: 3082744 (1963-03-01), Gardner
patent: 3614911 (1971-10-01), Belart
patent: 4608825 (1986-09-01), Fontaine
patent: 4649802 (1987-03-01), Myers
patent: 4763561 (1988-08-01), Gautier

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