| 摘要 |
PURPOSE:To lower production cost, and shorten production time by letting a gear main body having a tooth section on one side surface in the axial direction, and a shaft section which is stretched in a row to the inner circumference section of the gear main body while being extended outward in the axial direction beyond one side surface of a tooth section main body, be integrated by means of forging into a bevel gear, and letting it be removably supported by a gear case via bearings. CONSTITUTION:A gear main body 4 including a tooth section 4a of a bevel gearing 3, and a shaft section 5 which is stretched in a row to the inner circumference section of the gear main body 4 while being extended outward in the axial direction beyond one side surface (f) at the tooth section side, are integrally formed by means of forging. Therefore, there is no need for cutting the tooth section into a gear as in the past, production cost is lowered and production time is thereby shortened that much. Since the integration of the gear main body 4 and the shaft section 5 permits the shaft section 5 to be free from profile limitation imposed by an escape from a gear cutter, high degree of freedom can thereby be secured in the formation and constitution of the shaft section 5 itself.
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