| 摘要 |
PROBLEM TO BE SOLVED: To prevent reduction of load capacity and rigidity even when arranging a spacer between load balls and improve circulation property of the spacer by reducing friction of the load ball and the spacer greatly. SOLUTION: The spacer 10 having two recessed faces 11, 11 facing the balls 5, respectively, is arranged between adjacent balls 5, and cross section of each recessed face 11 of the spacer 10 is formed by two circular arcs having the Gothic arch shape whose central positions X, X are deviated from each other. The spacer 10 has such shape that is in contact with the adjacent balls 35 in an outer fringe part or in the vicinity of outer fringe. Furthermore, the spacer 39 has such shape that is in contact with the adjacent balls 35 in at least three outer fringe parts or in the vicinity of outer fringe. Furthermore, the spacer 39 has a through hole 41 in a section where its wall thickness is the smallest. COPYRIGHT: (C)2007,JPO&INPIT
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