Abstract: A piezoelectric actuator in which a piezoelectric element is present for subjecting an actuating element to a tensile or compressive stress. A sleeve is secured to a foot part, to which the piezoelectric element is secured and by way of which the piezoelectric element is kept centered in a housing under mechanical prestressing, and this sleeve surrounds the piezoelectric element in such a way as to stabilize it mechanically, at least in partial regions that are electrically insulated from the piezoelectric element. Between the sleeve and the piezoelectric element, a heat-conducting elastomer is placed, and the sleeve comprises a heat-conducting material that is deformable within predetermined limits.

Abstract: A piezoelectric component, including a ceramic actuator having a coating made of an elastomer. The elastomer is a heat conductive elastomer including a filler which is manufactured based upon aluminum dioxide, titanium dioxide, boron nitride, aluminum nitride, silicon carbide and/or preferably silicon dioxide.

Abstract: A piezoelectric actuator (1) is proposed, in which a piezoelectric element (2) is present for subjecting an actuating element to a tensile or compressive stress. A sleeve (4; 20) is secured to a foot part (3), to which the piezoelectric element (2) is secured and by way of which the piezoelectric element (2) is kept centered in a housing (8) under mechanical prestressing, and this sleeve surrounds the piezoelectric element (2) in such a way as to stabilize it mechanically, at least in partial regions that are electrically insulated from the piezoelectric element. Between the sleeve (4; 20) and the piezoelectric element (2), a heat-conducting elastomer (6) is placed, and the sleeve (4; 20) comprises a heat-conducting material that is deformable within predetermined limits.

Abstract: A piezoelectric actuator, for example for actuating a mechanical component, is proposed, which has a multilayered structure of piezoelectric layers and internal electrodes (2, 3) disposed between them. As a conductive surface, a first external electrode (6) is affixed to a respective side surface and is contacted by the respective internal electrodes (2, 3), and a second net-like or woven cloth-like external electrode (7) is disposed on the first external electrode (6). In the regions of the piezoelectric layers, which have respective internal electrodes (2, 3) that are respectively contacted on opposite sides from one another, there is a passive zone (10) without an internal electrode layer. The ceramic piezoelectric material—at least in the passive zone (10)—and the material of the second external electrode (7) have almost the same thermal expansion coefficient, by means of which the influence of mechanical stresses in the piezoelectric actuator can be reduced.