Fluid sprinkling – spraying – and diffusing – Unitary injection nozzle and pump or accumulator plunger – Fluid operated plunger motor
Patent
1995-11-27
1998-02-03
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Unitary injection nozzle and pump or accumulator plunger
Fluid operated plunger motor
239124, F02M 4702
Patent
active
057135207
ABSTRACT:
In a hydraulically actuated fuel injector, each injection event is initiated and terminated by opening an actuation fluid cavity within the injector to a high pressure inlet source and a low pressure drain, respectively. The present invention is intended to provide a more abrupt ending to each injection event in order to improve performance and exhaust emission quality. The present invention incorporates a hydraulically actuated spill valve into the injector body. The spill valve exploits the pressure differential existing between the fuel pressurization chamber of the injector toward the end of each injection and the drop in pressure in the actuation fluid cavity. This pressure differential is exploited to hydraulically open a spill port to allow the residual fuel pressure to dissipate into a fuel return passage rather than dribble out of the injector nozzle while the needle check is moving toward its closed position.
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Glassey Stephen F.
Holtman Richard H.
Caterpillar Inc.
Weldon Kevin
LandOfFree
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