| 摘要 |
A sprocket more firmly fitted to the sprocket attachment surface of a shaft comprising a plurality of teeth formed around the outer periphery and a boss portion having a central through hole. Hard abrasive grains are adhered by the electro-deposition process to an end surface of the boss portion that contacts the sprocket attachment surface of the sprocket. When fastening the sprocket to the sprocket attachment surface of the shaft, the abrasive grains on the end surface easily plastically deform the sprocket attachment surface, forming irregularities on the sprocket attachment surface. Thereby, engagement of the end surface of the sprocket with the sprocket attachment surface of the shaft is strengthened. As a result, even a small-sized sprocket may be further firmly fitted to the sprocket attachment surface of the shaft.
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