Piezoelectric actuator with means for compensation of the thermal change in length and fuel - injection valve with a piezoelectric actuator

摘要

To compensate for the different thermal change in length of the piezoelectric actuator 1 with respect to the actuator housing 4, 3, 6, 5, there is an actuator unit, in which the piezoelectric actuator 1 under stress in a tubular spring 3 is arranged, is proposed, the compensating element is arranged as the inside of an extension tube 6 to form aluminum - compensating cylinder 2. The piezoelectric actuator 1 and the compensating cylinder 2, in row, and are jointly mounted by means of the extension tube 6 to the actuator housing 3 extended bourdon tube spring biased.