| 摘要 |
PROBLEM TO BE SOLVED: To shorten a manufacturing work process, and reduce a cost by forming the shaft hole part so as to become the specific relationship between a radius of the shaft hole part and a shaft radius of a shaft, and forming a difference between the abutting surface part and the level difference plane part so as to become larger than a difference between the radius of the shaft hole part and the shaft radius of the shaft. SOLUTION: Two sprocket half bodies are installed on a shaft to be fastened by a bolt. Then, the shaft hole part 5 is formed so as to become the relationship of (R1>=R2) between the radius R1 and a shaft radius R2 of a shaft, and since a quantity S of a level difference between the abutting surface part 11 and the level difference plane part 13 is formed larger than a radial difference (R1-R2=T) between the radius R1 of the shaft hole part and the shaft radius R2 of the shaft, the shaft hole part 5 contacts with the surface of the shaft in the first place. However, at this time, since clearance of almost (S-T)×2 remains between the opposed level difference plane part 13, when the bolt is fastend further, the shaft hole part 5 of the shaft is brought into pressure contact with the bolt so as to fix a sprocket.
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