Piezoelectric actuator for operating a switching valve in vehicle fuel injection systems has an electrode structure consisting of a first outer electrode and a second flexible outer electrode formed by a helix

摘要

Piezoelectric actuator (1) comprises inner electrodes (2, 3) arranged between ceramic piezoelectric layers in a multiple layer structure, and an electrode structure consisting of a first outer electrode (4) and a second flexible outer electrode (5) formed by a helix which contacts the first outer electrode.