To provide a ball bearing capable of reducing rotational resistance.SOLUTION: A ball bearing 18 includes an outer ring 11, an inner ring 12, a plurality of balls 13, and a retainer 14. The retainer 14 has an annular portion 20 and a plurality of pillar portions 21. Each space between two neighboring pillar portions 21, 21 in a circumferential direction is defined to be a pocket 22. The pocket 22 has a pocket face 23 opposed to the ball 13. The pocket face 23 has a recessed face 30, a first plane 31 formed on an axial one side with respect to a pocket center and capable of being kept in contact with the ball 13, a third plane 33 formed on the axial other side with respect to the pocket center at the first pillar portion and capable of being kept in contact with the ball 13, and a fourth plane 34 formed on the axial other side with respect to the pocket center at the second pillar portion and capable of being kept in contact with the ball 13. The first plane 31 crosses an extension line of an auto-rotation axis of the ball 13, and the ball 13 is retained by the retainer 14, kept in point-contact with at least one plane among the first plane 31, the third plane 33 and the fourth plane 34.SELECTED DRAWING: Figure 3

    【課題】回転抵抗を低減することが可能となる玉軸受を提供する。【解決手段】玉軸受18は、外輪11と、内輪12と、複数の玉13と、保持器14とを備える。保持器14は、環状部20と複数の柱部21とを有する。周方向で隣り合う2つの柱部21,21の間の空間がポケット22である。ポケット22は、玉13に対向するポケット面23を有する。ポケット面23は、凹面30と、ポケット中心よりも軸方向一方側に形成され玉13に接触可能である第一平面31と、第一柱部においてポケット中心よりも軸方向他方側に形成され玉13に接触可能である第三平面33と、第二柱部においてポケット中心よりも軸方向他方側に形成され玉13に接触可能である第四平面34とを有する。第一平面31は、玉13の自転軸の延長線と交差し、玉13は、第一平面31、第三平面33、及び、第四平面34のうち、少なくとも1つの平面に点接触して、保持器14に保持される。【選択図】 図3


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    Title :

    BALL BEARING


    Additional title:

    玉軸受


    Contributors:

    Publication date :

    2023-09-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60B VEHICLE WHEELS , Räder für Fahrzeuge / F16C SHAFTS , Wellen



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