Vacuum control valve

Details Vacuum control valve Vacuum control valve

1982-07-15

1984-04-03

Burns, Wendell E.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

123568, 137505, 137868, 137DIG8, F02M 2506

Patent

active

044401396

ABSTRACT:
A vacuum modulating chamber of a vacuum control valve is communicated with a diaphragm chamber of a EGR valve for controlling an amount of exhaust gas to be recirculated into combustion chambers of an engine, so that a modulated negative pressure is applied thereto. The chamber is provided with a diaphragm deflected responding to the negative pressure in the chamber. The vacuum control valve is further provided with a cam member and a spring which urges the diaphragm in one direction so as to change a value at which the pressure in the vacuum modulating chamber is controlled. A push rod is movably held by a cam follower and another spring is provided for urging the push rod in the above direction. The spring force of the other spring is applied to the diaphragm, when a rotational angle of the cam member exceeds a predetermined angle, so that the negative pressure is changed rapidly.

REFERENCES:
patent: 4269159 (1981-05-01), Skinner
patent: 4365608 (1982-12-01), Bradshaw et al.
patent: 4369753 (1983-01-01), Sugiyama
patent: 4387693 (1983-06-01), Romblom

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