| 摘要 |
A stack of piezoelectric elements, in the form of an elongated rod divided in to segments, for generating electric energy in response to compressive stress is provided comprising: piezoelectric elements stacked one on top of the other such that electrodes of same polarity of adjacent disks are touching A holding structure, such as a screw holds the piezoelectric elements together between a top and a bottom end pieces which transfer mechanical compressive stress to the elements in the stack. The holding structure accepts shear stresses, provides preloading stress on the stack and prevents buckling of the stack under pressure. A recess in the end piece, deeper than the head of the screw, ensures that load placed on the stack will compress the piezoelectric elements and not on the screw. |
