Internal-combustion engines – Two-cycle – Rear compression
Patent
1988-06-06
1989-02-28
Okonsky, David A.
Internal-combustion engines
Two-cycle
Rear compression
123496, 417395, F02M 3704, F02M 5920
Patent
active
048075736
ABSTRACT:
The invention is directed to a fuel injection arrangement for two-stroke engines for portable tools such as motor-driven saws. In known fuel-injecting arrangements, the injection pump is driven by the pressure of the crankcase. The crankcase pressure increases up to a maximum value which remains constant starting with a predetermined rotational speed up to and including the maximum rotational speed. When the peak pressure of the crankcase is constant, the stroke of the pump piston of the injection pump is also constant and so is the quantity of fuel which is pumped. However, at higher speeds where the speed is increasing because of throttling in the air intake channel, the air charge of the cylinder reduces and an overrich mixture is formed. The fuel injection arrangement of the invention provides for an automatic reduction in the quantity of fuel injected at high and at the highest speeds. For adapting the required quantity of fuel at high speeds, a counterpressure is developed in the return chamber of the injection pump in dependence upon speed whereby the stroke of the pump piston is reduced. In this way, a corresponding reduction of the pumped quantity of fuel is achieved.
REFERENCES:
patent: 3765802 (1973-10-01), Lettermann et al.
patent: 3913551 (1975-10-01), Shaver
patent: 4300509 (1981-11-01), Schechter
patent: 4551076 (1985-11-01), DuBois
patent: 4552101 (1985-11-01), Borst et al.
patent: 4627390 (1986-12-01), Antoine
patent: 4700668 (1987-10-01), Schierling et al.
Geyer Werner
Nickel Hans
Schierling Roland
Wissmann Michael
Okonsky David A.
Ottesen Walter
Stihl Andreas
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