Patent ID: 8368288
Filing Date: 2013-02-05
Classification: F02M,H01L,Y10T

Abstract:
1. An actuator unit comprising an actuator housing enclosing a piezoelectric actuator element, wherein the actuator housing and the piezoelectric actuator element are made from different materials with correspondingly different coefficients of thermal expansion, a fastening element disposed on the actuator housing whose material is different from the material of the actuator housing and from the material of the piezoelectric actuator element in respect of the coefficient of thermal expansion, and wherein the actuator housing and fastening element materials are selected such that one of the materials has a higher coefficient of thermal expansion than the coefficient of thermal expansion of the piezoelectric actuator element and the other material has a lower coefficient of thermal expansion than the coefficient of thermal expansion of the piezoelectric actuator element, and the fastening element engages in a thread provided on the actuator housing.