Piezoactuator for piezoinjector for needle stroke in injection system for fuel with combustion engine, has piezoelements with inner electrodes and outer electrodes for contacting inner electrodes

摘要

The piezoactuator (1) has piezoelements with inner electrodes (2,3) and outer electrodes (5,6) for contacting the inner electrodes. The outer electrodes are applied in the contact area on metallic base coatings (7,8) of the piezoactuator. A mechanically flexible area is extended between the contact strips, in which the mechanical vibrations are executable by a suitable material or shaping of the outer electrodes in predetermined boundary. The outer electrodes are formed from single ply screen electrodes, particularly Invar(RTM: Nickel steel alloy).