Piezo actuator
First Claim
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).
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Accused Products
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.
34 Citations
20 Claims
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1. A piezoelectric actuator, comprising
at 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).
Specification