Piezoelectric actuator, method for the production of a piezoelectric actuator and injection system with such an actuator

摘要

The piezoactuator (1) has a piezo stack (4) that is located in an inner area of the actuator that has a temperature-and/or pressure-dependent volume change. Transmission units (5, 6) are located between the piezo stack and a casing (3) for transmitting the fuel pressure (P) on outside of the casing onto the piezo stack. The units include passivating liquid and preformed bodies, which have respective volume changes, where the relation between the liquid and the bodies is set such that a volume change of the casing corresponds to an overall volume change of the inner area of the actuator. An independent claim is also included for a method for manufacturing a piezoactuator.