Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Reexamination Certificate
1999-03-01
2001-12-18
Kashnikow, Andres (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
C239S553300, C239S585100, C239S585400, C239S596000
Reexamination Certificate
active
06330981
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates in general to electromagnetic fuel injectors for internal combustion engines and, in particular, to the generation of fuel turbulence in such fuel injectors.
Increasingly stringent exhaust emission standards have driven the automotive industry to discover ways of achieving more complete combustion and thereby lower emissions. One way of achieving more complete combustion is by using fuel injectors with improved fuel atomization.
Fuel injectors typically comprise an electromagnetically actuated needle valve disposed in a fuel volume. The needle valve is reciprocated axially within the fuel volume in response to energization and deenergization of an actuator to selectively open and close a flow path through the fuel injector. Particularly, the valve body or housing defining the fuel volume has an aperture or orifice at one end forming a seat for the end of the needle valve whereby its reciprocating motion enables an intermittent flow of fuel through the orifice. Typically, the fuel emitted from a fuel injector is atomized downstream of the orifice to provide the necessary fuel/air mixture in the combustion chamber of the engine.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a fuel injector with improved atomization.
This and other objects of the invention are achieved by a fuel injection valve for an internal combustion engine comprising an armature assembly including an injector needle reciprocable between a closed position and an open position; a needle seat for receiving the injector needle in the closed position, the needle seat including a central opening therethrough; a discharge orifice disk disposed downstream of the needle seat, the discharge orifice disk directing fuel toward a desired location; and a turbulence generator disposed upstream of the discharge orifice disk.
The discharge orifice disk defines at least one opening therein for directing fuel toward the desired location.
In one embodiment, the turbulence generator comprises a first turbulence generator disk having a central opening smaller than the central opening in the needle seat and a second turbulence generator disk having a central opening at least as large as a diameter of a circle containing the at least one opening in the discharge orifice disk, the first turbulence generator disk disposed downstream of the needle seat and the second turbulence generator disk disposed downstream of the first turbulence generator disk.
In a second embodiment, the central opening in the needle seat is smaller than a diameter of a circle containing the at least one opening in the discharge orifice disk and the turbulence generator comprises a turbulence generator disk having a central opening at least as large as the diameter of the circle containing the at least one opening in the discharge orifice disk and wherein the turbulence generator disk is disposed downstream of the needle seat.
In a third embodiment, the turbulence generator comprises a first turbulence generator disk having a plurality of openings therein, the plurality of openings being aligned such that, when viewed in a longitudinal direction of the fuel injector, the plurality of openings at least partially overlap the at least one opening in the discharge orifice disk, and a second turbulence generator disk having a central opening at least as large as a diameter of a circle containing the at least one opening in the discharge orifice disk, the first turbulence generator disk disposed downstream of the needle seat and the second turbulence generator disk disposed downstream of the first turbulence generator disk.
In a fourth embodiment, the central opening in the needle seat is smaller than a diameter of a circle containing the at least one opening in the discharge orifice disk and the turbulence generator comprises a counterbore in the needle seat, the counterbore having a diameter at least as large as the diameter of the circle containing the at least one opening in the discharge orifice disk wherein the counterbore is downstream of the central opening in the needle seat.
Further objects, advantages and features of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawing.
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Miandoab Farid H.
Nally, Jr. John F.
Peterson, Jr. William A.
Sayar Hamid
Ganey Steven J.
Kashnikow Andres
Siemens Automotive Corporation
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