| 摘要 |
PROBLEM TO BE SOLVED: To provide a small reliable gear with a shaft. SOLUTION: In a gear 2 with a shaft having a gear part 2a and a shaft part 2b supported by a bearing 4, a step part 20 with a smaller diameter than the diameter of the gear part 2a and a larger diameter than the diameter of the shaft part 2b is formed between the gear part 2a and the shaft part 2b. Further, a curved surface part 21 is formed between the end surface and an outer periphery so that the end surface of the step part 20 can be connected with the outer periphery of the shaft part 2b and also a ring shape groove 22 is formed on the outer periphery of the step part 20.
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