Crankcase fuel injection system for two-cycle internal combustio

Details Crankcase fuel injection system for two-cycle internal combustio Crankcase fuel injection system for two-cycle internal combustio

1996-11-08

1997-12-23

Miles, Tim R.

Gas and liquid contact apparatus

Fluid distribution

Pumping

261 392, 123 73C, 123DIG5, F02M 5914

Patent

active

057004021

ABSTRACT:
A crankcase fuel injection system includes a diaphragm type fuel pump, a crankcase fuel injector assembly, and a main air inlet assembly. Engine crankcase pulses generated by the up and down movements of the piston are utilized by the fuel pump to replenish the fuel mixture in a fuel mixture injector chamber of the fuel injector assembly. The air mass entering the crankcase upon the upstroke of the piston is controlled within the main air inlet assembly by a throttle valve and metered across a main air venturi. The venturi signal at the main air venturi is amplified by a booster venturi. The amplified venturi signal is applied to a middle chamber formed between the two diaphragms of the compound diaphragm assembly which serves as the injector pump mechanism. The force acting upon the diaphragm assembly due to the amplified venturi signal is further amplified due to the area relationships of the two diaphragms. The resulting amplified force creates an inward movement of the compound diaphragm assembly which injects a fuel charge from the fuel chamber under pressure into the crankcase across a check valve and a fuel injector orifice. The air-fuel ratio is trimmed using an aneroid chamber or a trim adjustment screw to control the addition of bleed air into the amplified venturi signal.

REFERENCES:
patent: 3262433 (1966-07-01), Jordan
patent: 3710771 (1973-01-01), Cingnegrani
patent: 4700668 (1987-10-01), Schierling et al.
patent: 4807573 (1989-02-01), Schierling et al.

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