Variable venturi carburetor

Details Variable venturi carburetor Variable venturi carburetor

1981-01-27

1983-01-25

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

261 44C, 261121B, 261DIG81, F02M 700

Patent

active

043697496

ABSTRACT:
Disclosed herein is an improvement in a variable venturi carburetor for an internal combustion engine which comprises a venturi portion, a float chamber, a main fuel passage communicating with the venturi portion and with the float chamber, a main fuel jet provided in the main fuel passage and a movable metering needle. A free end of the metering needle is adapted to control the size of the main fuel jet and the base portion of the metering needle is mounted to a suction piston adapted to transversely move with respect to the venturi portion in response to the condition of load on the internal combustion engine. The improvement includes provision of a bypass detouring upwardly from a portion of the main fuel passage upstream of the main fuel jet for discharging vapor of fuel, and the bypass communicates with a negative pressure passage which has an opening in the lower portion of the venturi portion and with an air passage which has an opening in the vicinity of an air horn inlet.

REFERENCES:
patent: 2752136 (1956-06-01), Gardner
patent: 4091781 (1978-05-01), Mituyasu
patent: 4110417 (1978-08-01), Konishi et al.

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