Poppet covered orifice fuel injection nozzle

Patent · Tue Sep 15 00:00:00 EDT 1987

OSTI ID:5980875

Sczomak, D P

A poppet covered orifice fuel injector nozzle for use in a direct injection type diesel engine, is described. The fuel injector nozzle includes an injector body means having an inlet for pressurized fuel at one end and having a spray tip at the opposite end. The spray tip has a discharge free end and an axial stepped through bore of predetermined internal diameter at its discharge free end with an annular frusto-conical valve seat encircling the bore at the discharge free end of the spray tip and an outward opening poppet valve operatively positioned in the injector body means. The poppet valve includes an annular head with a frusto-conical valve seat surface positioned for movement between a closed position and an outward open position relative to the valve seat and a stem portion extending from the head that is is slidably received in the bore. The poppet valve has an internal passage means in fluid communication at one end with the inlet and terminating at its other end in circumferentially spaced apart radial orifices that are inclined and located so as to discharge fuel parallel to and directly across the valve seat surface of the head. Each of the orifices has a Length of orifice to Diameter of orifice ratio on the order of 4 to 8; and spring means operatively associated with the poppet valve to normally bias the head of the poppet valve to he closed position. The frusto-conical valve seat and the valve seat surface together with the discharge free end of the spray tip are configured so that the valve seat surface will effect sealing engagement with the valve seat at substantially the outer peripheral edge with substantially no overhang to of these elements with respect to each other to prevent fuel wetting during injection when the head is moved to the open position and to prevent fuel flow from the orifices when the head is in the closed position.

• Assignee: General Motors Corp., Detroit, MI
• Patent Number(s): US 4693424
• OSTI ID: 5980875
• Resource Relation: Patent File Date: Filed date 23 Jul 1986
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
FUEL INJECTION SYSTEMS
NOZZLES
COMPRESSIBLE FLOW
DESIGN
DIESEL ENGINES
HYDRAULICS
LIQUID FLOW
OPERATION
ORIFICES
SEALS
SPRAYS
VALVES
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUID MECHANICS
FUEL SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MECHANICS
OPENINGS
330102* - Internal Combustion Engines- Diesel