Articulated open nozzle high pressure unit fuel injector

Patent · Tue Dec 31 04:00:00 EST 1991

OSTI ID:5656319

Perr, J P

This patent describes an open nozzle unit fuel injector for use in an internal combustion engine of the type having a drive train associated with each unit injector to synchronously control each unit injector. It comprises an injector body having an axial bore open from an end of the injector body and at least one injection orifice passing through a tip of the cup from the axial bore, a plunger assembly reciprocably movably disposed within the axial bore for movement between a retracted position and an advanced position under the influence of a drive train to be associated with the unit fuel injector, the plunger assembly including a plunger, an articulated tip, a connection means for connecting the articulated tip to the plunger while permitting axial movement therebetween and for allowing pressure of a trapped volume of fuel between the plunger and the articulated tip to hold the articulated tip in a closed position following termination of an injection event so as to avoid secondary injection, and a means for absorbing an over-travel imparted to the plunger by the associated drive train such that the pressure of the trapped volume of fuel is regulated without the provision of means for spilling the trapped volume, whereby the articulated tip does not experience the over-travel.

• Assignee: Cummins Engine Co., Inc., Columbus, IN (United States)
• Patent Number(s): US 5076240; A
• Application Number: PPN: US 7-534234
• OSTI ID: 5656319
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUELS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NOZZLES
PRESSURE REGULATORS
VOLUME