| 摘要 |
PURPOSE:To take out accurately fluctuation of torques, by detecting a torque of a rotating part by piezo-electric elements polarized in the peripheral direction. CONSTITUTION:Two piezoe-electric elements 1, 2 are both of a ring-shape facing one against the other with the opposite directions of polarization as shown by arrows. The element 1 is provided with a negative electrode 1a on the bottom surface and the element 2 with a negative electrode 2a on the top surface. Between these piezoe-electric elements, a terminal plate 3 of a thin metallic plate is inserted as a positive electrode plate and metallic reinforcing members 4, 5 of the same diameters as the elements 1, 2 are fixed on top and bottom of the plate 3 and the assembly is clamped with these reinforcement members. These members 4, 5 are pressed together into a single body by a threaded means passed through the center holes 1b, 2b of the elements 1, 2. By this arrangement, when subjected to a torque change, a sliding strain is generated in the polarized direction and an electric signal proportional to a magnitude of this changed torque can be taken out.
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