| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel hub capable of reducing a breakage accident of a wheel spoke while controlling an increase in wheel weight and a rise in production cost of a wheel. SOLUTION: A piercing direction 64 of a spoke locking part 32h forming a piercing hole 32f in a cylinder part 32b is set in a direction 21 nearly transverse to a hub axis 22 itself. Thereby, when a stretching direction 45 of a spoke 44 is in the outside direction of a tangent 41 of circumferences 40, 42 forming the spoke locking part 32h, an angle of the piercing direction 64 with the stretching direction 45 of the spoke 44 can be set in an obtuse angle. Then a stress concentration level and a work hardening level at an inside 44c of a bent part of the spoke can be relaxed. Consequently, a breakage accident of the spoke 44 can be reduced without using spokes having a thick size or a step.
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