Piezo actuator for use in piezo injector for controlling fuel injection with combustion engine, has multilayer structure of piezoelectric layer, which is enclosed between inner electrodes of alternating polarity

摘要

The piezo actuator (10) has a multilayer structure of piezoelectric position (11), which is enclosed between the inner electrodes (12,13) of alternating polarity. The inner electrodes are impinged with different polarities of the electrical voltage over the external electrodes (6,14). The separated contactable area of piezo position is switched with inner electrodes in multilayer structure of the piezo actuator selectively from an inactive condition to the stroke movement of the piezo actuator in an active condition.