| 摘要 |
PROBLEM TO BE SOLVED: To provide an integrally rolled lightweight wheel for a rolling stock of high safety against thermal stresses. SOLUTION: A curve 102a in a vicinity of a boss on the flange side out of a joined part of a boss part 103 with a curved plate part 102 is smoothly brought into contact with an overall line of an outer circumferential connection surface 103f of a large diameter end of the boss. The radius of curvature of the curve 102a in a vicinity of the boss on the flange side is large, and substantially close to that of a plane. Therefore, even when the vertical back pressure is applied to a flange 101, stress concentration is hardly generated in a part of the curve 102a in a vicinity of the boss on the flange side, the strength of the wheel is improved, and the safety factor is increased. COPYRIGHT: (C)2004,JPO
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