| 摘要 |
PURPOSE:To obtain the strong torque by penetrating a bolt into a through hole of a piezoelectric oscillator and the metallic blocks, constituting a stator fixed by a nut and combining a rotor with the end of the nut or the bolt. CONSTITUTION:A piezoelectric oscillator 1 is held between the metallic blocks 2 and 3. A bolt 4 is penetrated into the piezoelectric oscillator 1 and the metallic block 3. A nut 5 is screwed and fitted over a screw 4b of the bolt 4 to constitute a stator 6 by fixing together as a unit. When an alternating current is applied to the piezoelectric oscillator 1 of the stator 6 from the alternating current power source 7, the stator 6 resonates with the longitudinal oscillation by the generation of longitudinal oscillation from the piezoelectric oscillation 1. According to the constitution, the stator 6 oscillates with retrogressive resonance, but, at the same time, because the bolt 4 itself also oscillates with retrogressive resonance, the big elliptic oscillation generates at a part of the nut 5 of the end of the bolt 4. Accordingly, a rotor 8 in pressure contact with the part of the nut 5 rotates with the strong torque. |
