| 摘要 |
PROBLEM TO BE SOLVED: To provide a sprocket wheel that does not cause a problem of strength shortage in a key groove even when a plastic-made boss part is employed. SOLUTION: This sprocket wheel comprises the boss part 3 having a shaft hole and a tooth part 2 removably disposed on the outer periphery of the boss part 3, and a bush 7 is disposed in the shaft hole in the boss part 3.
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