Monolithic it has with the movement territory and safe layer the piezo actuator

摘要

Constitution of this invention which solves topic, monolithic the piezo actuator which has all the layered products (10) of multilayer structure (1), the part layered product (12) of one piezoelectric activity being provided at least, the said part layered product being piled up, mutually, alternately while being piezoelectric ceramic layer and the said piezoelectric ceramic layer which are arranged has had with the electrode layer which is arranged, on the part layered product of piezoelectric activity, one piezoelectric inactive termination environment (15) being arranged at least, with the part layered product and the termination environment of piezoelectric activity, at leastOne movement territory (11) to be arranged, the movement territory being piled up, mutually and while being movement territory piezoelectric ceramic layer and the said movement territory piezoelectric ceramic layer which are arranged we have possessed with the movement territory electrode layer which is arranged, as for movement territory piezoelectric ceramic layer and movement territory electrode layer mutually as follows, namely, in the lamination direction of the movement territory in order to be able to change to movement territory piezoelectric ceramic layer connected possible electric field gradually from movement territory piezoelectric ceramic layer, with the electric control of movement territory electrode layer to movement territory piezoelectric ceramic layer, we to be arranged, the piezoelectricityThe part layered product of activity we have possessed safe layer (13) facing toward the movement territory, at said safe layer crack that tried is formed profitably the mechanical overload time. This piezo actuator is used for the case where the injection valve of the internal combustion engine is controlled.