Piezo-actuator comprising a temperature compensator

Piezoelectric actuator having a piezoelectric element (2;

• 21) for actuating a mechanical component with a pulling or pushing force, and a compensating element (3;
• 22), wherein the piezoelectric element (2) and the compensating element (3;
• 22) basically have the same temperature expansion coefficients, and wherein the compensating element (3;
• 22) is mechanically coupled to the piezoelectric element (2:
• 21) in such a fashion that the temperature-induced expansions of the piezoelectric element (2;
• 21) and the compensating element (3;
• 22) cancel each other out in the effective direction in such a fashion that the actuating element remains in the position, and wherein the piezoelectric element (2;
• 21) is supported on one end on a fixed support plate (9), which fixed support plate (9) bear against the housing (7) for the piezoelectric actuator (1;
• 20) via a spring (10) and which is connected at the other end to a pretensioning spring (6;
• 23), in turn, is held against the fixed support plate (9) with its other end, and that the compensating element (3;
• 22) basically ties parallel to the piezoelectric element (2;
• 21) and is also held against the fixed support plate (9) with one end and solidly abuts the housing (7) with the other end.

Piezoelectric actuator having a piezoelectric element (2;

• 21) for actuating a mechanical component with a pulling or pushing force, and a compensating element (3;
• 22) wherein the piezoelectric element (2) and the compensating element (3;
• 22) basically have the same temperature expansion coefficients, and wherein the compensating element (3;
• 22) is mechanically coupled to the piezoelectric element (2;
• 21) in such a fashion that the temperature-induced expansions of the piezoelectric element (2;
• 21) and the compensating element (3;
• 22) cancel each other out in the effective direction in such a fashion that the actuating element remains in the position, and wherein the piezoelectric element (2, 21) is composed of a multilayer structure of transversely arranged, ceramic piezoelectric plies that become longer in the effective direction when an external electric voltage is applied, and that the compensating element (3;
• 22) is composed of piezoelectric plies arranged in the longitudinal direction that become shorter in the effective direction when an external electric voltage is applied.