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 u
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.
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1. A piezoelectric actuator, comprisingat least one piezoelectric element for subjecting an actuating element to a tensile or compressive stress, said piezoelectric element having a moving end and a fixed end opposite the moving end,a foot part ( 3 ) to which the fixed end of the piezoelectric eleme
1. A piezoelectric actuator, comprisingat least one piezoelectric element for subjecting an actuating element to a tensile or compressive stress, said piezoelectric element having a moving end and a fixed end opposite the moving end,a foot part ( 3 ) to which the fixed end of the piezoelectric element ( 2 ) is secured and by way of which the piezoelectric element ( 2 ) is kept centered in a housing ( 8 ) under a mechanical prestressing,a sleeve ( 4 , 20 ) secured to the foot part ( 3 ) and surrounding the piezoelectric element ( 2 ) In such a way as to stabilize the sleeve ( 4 , 20 ) mechanically, at least in regions that are electrically insulated from the piezoelectric element,the housing ( 8 ) having a retaining bore ( 5 ) for receiving the piezoelectric actuator and into which the sleeve ( 4 , 20 ) together with the piezoelectric element ( 2 ) are firmly press-fitted optionally via an oblique shoulder ( 7 ) on the periphery of the retaining bore ( 5 ). 2. The piezoelectric actuator of claim 1, further comprisinga heat-conducting elastomer ( 6 ) placed between the sleeve ( 4 , 20 ) and the piezoelectric element ( 2 ). 3. The piezoelectric actuator of claim 1, wherein the sleeve ( 4 , 20 ) comprises a heat-conducting material that is deformable within predetermined limits. 4. The piezoelectric actuator of claim 2, wherein the sleeve ( 4 , 20 ) comprises a heat-conducting material that is deformable within predetermined limits. 5. The piezoelectric actuator of claim 3, wherein the sleeve ( 4 , 20 ) is of metal. 6. The piezoelectric actuator of claim 4, wherein the sleeve ( 4 , 20 ) is of metal. 7. The piezoelectric actuator of claim 3, wherein the sleeve ( 4 , 20 ) is of plastic. 8. The piezoelectric actuator of claim 4, wherein the sleeve ( 4 , 20 ) is of plastic. 9. The piezoelectric actuator of claim 1, wherein the sleeve ( 20 ) has recesses ( 21 , 23 , 24 , 25 ) in its wall. 10. The piezoelectric actuator of claim 2, wherein the sleeve ( 20 ) has recesses ( 21 , 23 , 24 , 25 ) in its wall. 11. The piezoelectric actuator of claim 3, wherein the sleeve ( 20 ) has recesses ( 21 , 23 , 24 , 25 ) in its wall. 12. The piezoelectric actuator of claim 5, wherein the sleeve ( 20 ) has recesses ( 21 , 23 , 24 , 25 ) in its wall. 13. The piezoelectric actuator of claim 7, wherein the sleeve ( 20 ) has recesses ( 21 , 23 , 24 , 25 ) in its wall. 14. The piezoelectric actuator of claim 1, wherein the foot part ( 3 ) has an encompassing groove ( 27 ), into which a likewise encompassing bead ( 28 ) can be latched on the inside diameter of the sleeve ( 4 , 20 ). 15. The piezoelectric actuator of claim 2, wherein the foot part ( 3 ) has an encompassing groove ( 27 ), into which a likewise encompassing bead ( 28 ) can be latched on the inside diameter of the sleeve ( 4 , 20 ). 16. The piezoelectric actuator of claim 5, wherein the foot part ( 3 ) has an encompassing groove ( 27 ), into which a likewise encompassing bead ( 28 ) can be latched on the inside diameter of the sleeve ( 4 , 20 ). 17. The piezoelectric actuator of claim 1, further comprising a centering ring ( 17 ) between the piezoelectric element ( 2 ) and the sleeve ( 4 , 20 ). 18. The piezoelectric actuator of claim 2, further comprising a centering ring ( 17 ) between the piezoelectric element ( 2 ) and the sleeve ( 4 , 20 ). 19. The piezoelectric actuator of claim 9, wherein, after the piezoelectric element ( 2 ) with the sleeve ( 20 ) has been inserted into a retaining bore ( 5 ) in the housing ( 8 ) for the piezoelectric actuator ( 1 ), the remaining interstices in the retaining bore ( 5 ) are filled at least partially with a heat-conducting elastomer ( 6 ). 20. The piezoelectric actuator of claim 14, wherein, after the piezoelectric element ( 2 ) with the sleeve ( 20 ) has been inserted into a retaining bore ( 5 ) in the housing ( 8 ) for the piezoelectric actuator ( 1 ), the remaining interstices in the retaining bore ( 5 ) are filled at least partially with a heat-cond ucting elastomer ( 6 ).
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이 특허에 인용된 특허 (6)
Montuschi, Mario; Faggioli, Eugenio, Control valve with a self-compensating piezoelectric actuator.
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