Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-06-21
1997-12-16
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
239 96, F02M 700
Patent
active
056973420
ABSTRACT:
A hydraulically actuated fuel injector includes an injector body having a needle control chamber, a nozzle chamber, and a nozzle outlet that opens to the nozzle chamber. Fuel within the injector is hydraulically pressurized during each injection cycle. A needle valve is positioned to reciprocate in the nozzle chamber between an open position in which the nozzle outlet is open and a closed position in which the nozzle outlet is closed. The needle valve includes a closing hydraulic surface exposed to pressure in the needle control chamber. A needle control valve is mounted within the injector body and is moveable between an off position in which the needle control chamber is opened to a source of high pressure fluid and an on position in which the needle control chamber is opened to a low pressure passage.
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Anderson Michael D.
Gibson Dennis H.
Hefler Gregory W.
Maley Dale C.
Shinogle Ronald D.
Caterpillar Inc.
Moulis Thomas N.
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