| 摘要 |
A mold ( 22 ) includes a bead ring ( 32 ). The bead ring ( 32 ) includes a side forming surface ( 34 ), a bottom forming surface ( 36 ), a support surface ( 38 ) for a bladder, and a guide surface ( 40 ) for a bladder. The support surface ( 38 ) is positioned on an inside in a radial direction of the bottom forming surface ( 36 ). The support surface ( 38 ) is extended in the radial direction. A distance (L 2 ) of the support surface ( 38 ) is equal to or smaller than 5.0 mm in the radial direction. The guide surface ( 40 ) is positioned on an inside in the radial direction and an outside in an axial direction from the support surface ( 38 ). The guide surface ( 40 ) is inclined inward in the axial direction from the inside in the radial direction toward an outside in the radial direction. An angle theta of the guide surface ( 40 ) to the radial direction is equal to or greater than 15 degrees and is equal to or smaller than 75 degrees. In an expansion, a bladder (B) is erected by the guide surface ( 40 ). By a further expansion, the bladder (B) is supported by the support surface ( 38 ).
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