Fuel injector for internal combustion engine having throttle por

Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner

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239584, F02M 5106

Patent

active

054528585

ABSTRACT:
A fuel injector wherein a piston driven by the extension and contraction of a piezoelectric actuator changes the pressure of a working fluid in a variable pressure chamber and back pressure chamber so as to drive a needle valve to open and close a fuel injection hole, wherein undesirable secondary injection after a main injection in prevented by providing a throttle portion for narrowing the communicating passage between the variable pressure chamber and back pressure chamber when the piston moves forward and the needle valve closes the fuel injection hole.

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patent: 4725002 (1988-02-01), Trachte
patent: 4728074 (1988-03-01), Igashira et al.
patent: 4909440 (1990-03-01), Mitsuyasu et al.
patent: 5219122 (1993-06-01), Iwanaga
patent: 5323964 (1994-06-01), Doszpoly et al.

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