Fuel injector for an internal combustion engine

Details Fuel injector for an internal combustion engine Fuel injector for an internal combustion engine

F - Mech Eng,Light,Heat,Weapons

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F02M 61/04 (2006.01) F02M 57/02 (2006.01)

Patent

CA 1055343

ABSTRACT OF THE DISCLOSURE This disclosure deals with a fuel injector for an internal combustion engine. The injector includes an injec- tor body having a fuel metering chamber formed therein which receives fuel from a fuel supply. A plunger is movable into the chamber in an injection stroke to force fuel from the chamber and out of the injector through spray holes. A valve member is mounted in the path of fuel flow from the chamber to the spray holes, the valve member being movable between first and second positions. In the first position, the valve member seals the path and prevents air in the combustion chamber from mixing with the fuel being metered into the metering chamber, and in the second position the valve member closes the spray holes to terminate injection. During an injection stroke, the plunger moves the valve member from the first position toward the second position, and fuel in- jection takes place while the valve member is intermediate the first and second positions The valve member is also subjected to hydraulic forces at the end of the injection stroke, which move the valve member into the second position in order to abruptly terminate injection. -1-

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