| 摘要 |
PROBLEM TO BE SOLVED: To intensify strength in a seat part, by uniformizing a thickness between a seat surface engaged with a bolt head part and a split line in both sides of axial direction. SOLUTION: An inner side raceway track member 10 having an inner side raceway surface 12 is constituted by tightening split units 14, 16, divided by a split line m, m' inclined relating to an axial center L, with a bolt 50. The bolt 50 is arranged axially in both sides of the inner side raceway surface 12. A seat surface 62 of the split unit 14, 16 engaged with a head part 52 of both these tightening members 50 is arranged by interposing the split line m, m' in its both sides.
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