Variable venturi-type carburetor

Details Variable venturi-type carburetor Variable venturi-type carburetor

1982-09-14

1984-05-22

Miles, Tim R.

Gas and liquid contact apparatus

Fluid distribution

Valved

261 44C, 261121B, 261 52, F02M 906

Patent

active

044501170

ABSTRACT:
A variable venturi-type carburetor comprising a suction piston, a fuel passage, and a needle fixed onto the suction piston and extending through the fuel passage. An air bleed passage is connected to the fuel passage. During engine starting, before the engine begins to rotate by its own power, the vacuum chamber of the suction piston is open to the atmosphere and the air bleed passage is shut off. When the engine begins to rotate by its own power, the vacuum chamber of the suction piston is closed from the atmosphere. After this, the air bleed passage is gradually opened. Such control of the closing of the vacuum chamber and the opening of the air bleed passage prevents engine stall by preventing the fuel mixture from becoming excessively lean when the engine first begins to rotate on its own power and then prevents engine misfires by subsequently reducing the air-fuel ratio to a lean mixture.

REFERENCES:
patent: 3243167 (1966-03-01), Winkler
patent: 3249345 (1966-05-01), Gast
patent: 3493217 (1970-02-01), Farley
patent: 3900014 (1975-08-01), Bundesen et al.
patent: 3956434 (1976-05-01), Dickensheets et al.
patent: 4117046 (1978-09-01), Nohira et al.
patent: 4276238 (1981-06-01), Yoshikawa et al.
patent: 4302404 (1981-11-01), Nakamura et al.

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