| 摘要 |
A gear which reduces the processing cost by preventing strength of the gear from being lowered since the gear does not need machining such as cutting to remove burrs caused by the conventional hobbing is provided. A gear comprises round chamfered portions(111,121,131) formed by forging on respective ridge line portions at respective intersections between tooth root faces(11), tooth flanks(12), and a tooth tip face(13) of a gear(1) formed by forging and end faces(14) in the axial direction of the gear. The gear comprises chamfered portions(123) formed by forging on straight ridge line portions between the tooth flanks and the tooth tip face of the gear. The gear comprises chamfered portions(1231) formed by forging on the ridge line portions at intersections between the chamfered portions(123) formed by forging between the tooth flanks and the tooth tip face of the gear and the end faces in the axial direction of the gear. |
