Vacuum servo unit for a vehicle braking system

Details Vacuum servo unit for a vehicle braking system Vacuum servo unit for a vehicle braking system

1995-05-25

1997-02-11

Ryznic, John E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

913692, B60T 1357

Patent

active

056010087

ABSTRACT:
The present invention is directed to a vacuum servo unit, wherein a variable pressure chamber is capable of communicating with the atmosphere through a clearance which is defined between an air valve member slidably mounted on an input member and a seal member provided in a cylindrical member, and wherein the variable pressure chamber is capable of communicating with a constant pressure chamber through a clearance which is defined between a vacuum valve member and a seal portion of a control valve member. Accordingly, when the air is introduced from the clearance between the air valve member and the seal member in the condition where the seal portion of the control valve member is in contact with the vacuum valve member, the control valve member is biased toward the vacuum valve member by the pressure difference between the negative pressure and the atmospheric pressure.

REFERENCES:
patent: 4598625 (1986-07-01), Belart
patent: 4633760 (1987-01-01), Wagner
patent: 4813338 (1989-03-01), Mortimer et al.
patent: 4898073 (1990-02-01), Seip et al.
patent: 4970940 (1990-11-01), Boehm et al.
patent: 5014597 (1991-05-01), Rueffer et al.
patent: 5115718 (1992-05-01), Gautier et al.
patent: 5323685 (1994-06-01), Wagner
patent: 5493946 (1996-02-01), Schluter

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