Patent ID: 6422482
Filing Date: 2002-07-23
Classification: F02M,H01L

Abstract:
A fuel injection valve for a fuel injection system of an internal combustion engine, the fuel injection valve comprising:a valve seat body; a valve closing body cooperating with the valve seat body to form a sealing seat; a piezoelectric actuator for actuating the valve closing body, wherein the piezoelectric actuator includes a plurality of piezo layers made of a piezoelectric material having a negative temperature expansion coefficient, and at least one temperature compensation layer having a positive temperature expansion coefficient, the piezoelectric actuator having a first end facing the valve seat body and a second end distal to the valve seat body; a valve housing; and an equalizing sleeve made of a material having a low temperature expansion coefficient, wherein the equalizing sleeve determines an axial position of the piezoelectric actuator in the valve housing, and wherein the equalizing sleeve has a first end having an axial position equivalent to the first end of the piezoelectric actuator, and a second end having an axial position equivalent to the second end of the piezoelectric actuator.