| 摘要 |
PURPOSE:To enable to effectively transmit a rotation in a light contact with a tire by rotatably supporting at both ends a cylindrical permanent magnet which is contacted at the peripheral surface with a tire, and disposing a core, on which a coil is wound in the magnet. CONSTITUTION:End walls 4, 5 are provided at both ends of a cylindrical permanent magnet 3 formed with rugged surface on the outer peripheral surface, and the magnet 3 is rotatably supported to a supporting shaft 2 fixed to a supporting frame 1 via bearings 6, 7 provided at the centers of the walls 4, 5. A cross core 8, on which a coil 9 is wound is fixed to the shaft 2 in the magnet 3. In this manner, the magnet 3 can be effectively supported, and even if the pressure contact with the tire is weak, the rotation can be effectively transmitted. |
