Patent ID: 6834812
Filing Date: 2004-12-28
Classification: F02M

Abstract:
Fuel injector provided with a piezoelectric actuator, a valve activated by the piezoelectric actuator and regulating a fuel supply that flows in a working direction, and a mechanical transmission placed between the piezoelectric actuator and the valve; an expansion of the piezoelectric actuator displacing the valve in the working direction from a closed position to an open position; the mechanical transmission being capable of displacing the valve in the working direction from the closed position to the open position in an opposite direction (V1) to that (V2) of the fuel outlet; said piezoelectric actuator comprising a fixed frame and an actuator body made of piezoelectric material arranged in alignment with said working direction; the actuator body having a lower base, which is arranged close to said valve and is linked to the fixed frame, and an upper base, which is opposite the lower base and is free to slide with respect to the fixed frame in the working direction; said mechanical transmission comprising mobile equipment, which is arranged in contact with the upper base and is connected rigidly to said valve; said mobile equipment comprising a ring component substantially rectangular in shape, which is moveable in said working direction, is arranged around said actuator body, and has a first side arranged in contact with said upper base and a second opposite side, connected rigidly to said valve.