| 摘要 |
PROBLEM TO BE SOLVED: To improve a function and a quality of a gear by forming, for example, a gear out of a magnetic molded product. SOLUTION: A transmission gear comprises a gear main body 5, and a magnetic part 7 covering the outer surface of teeth part 6 on the outer periphery of the gear main body 5. The gear main body 5 is molded by only a plastic material, and the magnetic part 7 is molded by using a plastic magnet as a material. Gear teeth 8 adjacent to the magnet part 7 are alternately magnetized as an N pole and an S pole. Since mutual interlocked teeth faces of mutually interlocking gears can transmit power under a magnetically attracted state thereby, generation of a noise due to a backlash is inhibited, and the gear transmission part can be made silent.
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