Patent ID: 6460779
Filing Date: 2002-10-08
Classification: F02B,F02M,H02N,Y02T

Abstract:
A fuel injector, comprising:one of a piezoelectric actuator and a magnetostrictive actuator, a valve needle; a valve-closure member that is actuated by the one of the piezoelectric actuator and the magnetostrictive actuator via the valve needle; a valve seat surface with which the one of the piezoelectric actuator and the magnetostrictive actuator cooperates to form a sealing seat, wherein: the one of the piezoelectric actuator and the magnetostrictive actuator is capable of being actuated in a first direction of motion, and the valve-closure member is capable of being moved by the valve needle in a second direction of motion that is essentially perpendicular to the first direction of motion; a hydraulic transmission device arranged between the one of the piezoelectric actuator and the magnetostrictive actuator and the valve needle; a first transmission piston via which the one of the piezoelectric actuator and the magnetostrictive actuator is connected to a transmission chamber of the hydraulic transmission device; and a second transmission piston via which the valve needle is connected to the transmission chamber; wherein: the transmission chamber is filled with a hydraulic medium and is essentially bent in an L-shape, a first surface of the first transmission piston, at which the first transmission piston is connected to a first arm of the transmission chamber, is larger than a second surface of the second transmission piston, at which the second transmission piston is connected to a second arm of the transmission chamber, the fuel injector opens to the outside, and the second arm is arranged on a side of the second transmission piston that is facing away from the valve-closure member.