| 摘要 |
PROBLEM TO BE SOLVED: To achieve a structure which reduces rotation torque without sacrificing durability. SOLUTION: When setting the outer diameter of an outer ring 4 as D, the inner diameter of an inner ring 2 as d, and a pitch circle diameter of each ball 6 as dm, it is composed so as to satisfy a relation of (D+d)/2×0.85≤dm≤(D+d)/2×0.97. When setting a diameter of each ball 5 as Da, an axial width of a ball bearing as B, a center distance between respective balls 6 circumferentially adjacent to each other as L, and a cross-sectional height of the ball bearing calculated by a relational expression of H=(D-d)/2 as H, it is composed so as to satisfy all the relations of 0.60≤Da/H≤0.75, 0.58≤Da/B≤0.85, and 1.03Da≤L≤1.25Da. COPYRIGHT: (C)2008,JPO&INPIT
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