Piezoceramic bending transducer and use thereof
AssigneesSiemens Aktiengesellschaft, Festo AG & Co.
InventorsMarkus Hoffman, Karl Lubitz, Michael Riedel, Michael Weinmann
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Abstract
The invention relates to a piezoelectric bending transducer (1), comprising a support body (3), a stack (4) of piezoceramic layers (6), arranged thereon and flat electrodes (7, 8) arranged between the layers (6). On the side of the support body (3) facing the stack (4) an adaptation layer (10) is arranged with essentially the same coefficient of expansion as the piezoceramic. The bending transducer (1) displays a good actuating power and a low thermal natural distortion with economical production costs. Said transducer is particularly suitable for application in a valve.
Claims10
A piezoceramic bending transducer (1) having a support body (3) and having a stack of layers (6) comprising piezoceramic and comprising planar electrodes (7, 8) arranged between the layers (6), which stack is applied to the support body, characterized in that a matching layer (10) comprising a material which has substantially the same coefficient of thermal expansion as the piezoceramic bending is applied to that side of the support body (3) which is remote from the stack.
The piezoceramic bending transducer (1) as claimed in one of the preceding claims, characterized in that a free part (21) of the support body (3), on a securing side (12), extends beyond the stack and beyond the matching layer (10).
The use of the piezoceramic bending transducer (1) as claimed in one of the preceding claims as actuator in a valve, in particular in a pneumatic valve.
Dependencies are inferred from the claim text.