Structure of fuel injector using piezoelectric actuator

Details Structure of fuel injector using piezoelectric actuator Structure of fuel injector using piezoelectric actuator

2005-04-05

2005-04-05

Miller, Carl S. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S458000, C239S584000

Reexamination Certificate

active

06874475

ABSTRACT:
A fuel injector for an internal combustion engine is provided. The fuel injector has a simple structure so that it is easy to install and remove a piezoelectric valve actuator in and from the fuel injector, and to adjust fuel injection characteristics finely which allows the overall size of the fuel injector to be decreased. The fuel injector includes a housing to be installed in the engine and a structural element serving to install the piezoelectric valve actuator in the housing to be detachable easily. The piezoelectric valve actuator is retained in an actuator casing fitted in the housing so that it can expand or contract to move a needle valve. The actuator casing has an extensible portion in itself or is coupled to a bellows in alignment for enabling the piezoelectric valve actuator to expand, thereby allowing the size of the actuator casing to be minimized.

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