Piezoelectric actuator for fuel injection valve for combustion engine, has actuator main portion which comprises primary electrode layer and secondary electrode layer that are arranged on opposite sides of ceramic layer

摘要

The piezoelectric actuator (1) has an actuator main portion (20) which comprises a ceramic layer (2), a primary electrode layer (8) and a secondary electrode layer (9). The ceramic layer is extended in a radial direction (15) relative to a longitudinal axis (10) of the actuator main portion and perpendicular to the radial direction helically around the longitudinal axis (16) of the actuator main portion. The primary electrode layer and the secondary electrode layer are arranged on the opposite sides (4,5) of the ceramic layer.