Patent ID: 6414418
Filing Date: 2002-07-02
Classification: F02M,H01L

Abstract:
In a piezoelectric actuator for actuating control valves or injection valves in motor vehicles and having an actuator body (10) in the form of a multilayered laminate made up of stacked layers of piezoelectric material (11) with intervening metallic or electrically conductive layers (12,13) that function as electrodes, which alternatingly contact common electrode strips (14,15) disposed on the circumference in the longitudinal direction of the actuator body (10), and having electrical connecting conductors (16,17) which, in order to supply the operating voltage to the piezoelectric actuator (10), electrically contact the respective common electrode strips (14,15), the improvement wherein on at least one end face (9) remote from the valve, the actuator body (10) has a covering layer (18) made of piezoelectrically inactive ceramic material and wherein the connecting conductors (16,17) electrically contact the common electrode strips (14,15) only in the vicinity of this covering layer (18), wherein the common electrode strips (14,15) each lead to and extend at least partially over the end face (9) of the covering layer (18) and contact the connecting conductors (16,17) on the end face.