Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Reexamination Certificate
2000-02-29
2001-08-28
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
C239S585300, C239S585400, C239S585500, C239S102200, C251S129060
Reexamination Certificate
active
06279842
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an electronically-controlled fuel injector for internal combustion engines, and more particularly to fuel injectors suited for the direct injection of high-pressure fuel into the combustion chamber of an internal combustion engine.
BACKGROUND OF THE INVENTION
Various types of fuel injectors are known for use with internal combustion engines. In one type, a low voltage solenoid coil is used in combination with an iron rod to restrict or enable fuel delivery from the injector tip. In another type, the fuel injector includes a piezoelectric component with is activated by a high voltage, low current across its surface to control fuel delivery. Piezoelectric injectors may be operated at high frequency which permits shaping of the fuel delivery profile.
Both of the above fuel injectors suffer from disadvantages. The solenoid/iron arrangement operates slowly. For example, their maximum cyclic capacity is approximately 1200 cycles per minute (cpm). While the piezo-electric device is much faster (e.g., approximately 6000 cpm), it is expensive to produce and has a limited life due to stresses produced within the piezoelectric components. Thus, a need exists for a high-pressure fuel injector for use with internal combustion engines where the fuel injector is capable of high cycles per minute and that is also long-lived. The present invention is directed to fulfilling these needs and others, as described below.
SUMMARY OF THE INVENTION
The present invention includes a unique fuel injector and its application in an internal combustion engine. Each embodiment uses an assembly that incorporates a magnetostrictive rod to extend and retract a needle to control fuel expulsion from the injector. In one embodiment, the fuel injector includes an actuation assembly and a nozzle assembly releasably connected thereto. In another embodiment, the fuel injector includes a pintle-style needle tip. In yet other embodiments, the fuel injector includes a long-stem style needle tip.
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Christensen O'Connor Johnson & Kindness PLLC
Evans Robin O.
Rodi Power Systems, Inc.
Scherbel David A.
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