Piezoelectric actuator
First Claim
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1. Piezoelectric actuator comprising:
- at least two disk-shaped bending elements, arranged coaxially above one another, each of said bending elements including a carrier plate made of a hard-elastic material;
a layer of piezoelectric material applied to at least one side of each of said carrier plates; and
at least two bending joints connecting said carrier plates, said bending Joints being arranged on the circumference of the carrier plates;
whereineach of said bending joints comprises at least one bending bar and a rigid separator which is substantially perpendicular thereto;
said at least one bending bar comprises a lateral extension of a carrier plate, has a fastening eye coupled to a separator piece, and is dimensioned according to the equation ##EQU2## wherein b, l, h and E are the width, length, height and the modulus of elasticity of the bending bar, respectively;
F is the nominal force of the actuator;
Xs is the deformation of a bending bar at the nominal lift x of the actuator with Xs <
0.2x; and
n is the number of bending joints between two bending elements.
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Abstract
The piezoelectric actuator consists of at least two disk-shaped congruent bending elements which each have a carrier plate made of a hard-elastic material with a layer of a piezoelectric material applied to one or both sides. Two bending elements respectively are connected with one another by way of at least two bending joints arranged on the circumference of the carrier plates.
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Citations
1 Claim
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1. Piezoelectric actuator comprising:
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at least two disk-shaped bending elements, arranged coaxially above one another, each of said bending elements including a carrier plate made of a hard-elastic material; a layer of piezoelectric material applied to at least one side of each of said carrier plates; and at least two bending joints connecting said carrier plates, said bending Joints being arranged on the circumference of the carrier plates;
whereineach of said bending joints comprises at least one bending bar and a rigid separator which is substantially perpendicular thereto; said at least one bending bar comprises a lateral extension of a carrier plate, has a fastening eye coupled to a separator piece, and is dimensioned according to the equation ##EQU2## wherein b, l, h and E are the width, length, height and the modulus of elasticity of the bending bar, respectively; F is the nominal force of the actuator; Xs is the deformation of a bending bar at the nominal lift x of the actuator with Xs <
0.2x; andn is the number of bending joints between two bending elements.
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Specification
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Current AssigneeDaimler-Benz AG (Mercedes-Benz Group AG)
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Original AssigneeDaimler-Benz AG (Mercedes-Benz Group AG)
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InventorsHermle, Frank, Janker, Peter
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Primary Examiner(s)Budd, Mark O.
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Application NumberUS08/744,951Time in Patent Office684 DaysField of Search310/328, 310/323, 310/330-332, 310/324US Class Current310/332CPC Class CodesH10N 30/204 using bending displacement,...H10N 30/2047 Membrane type
