| 摘要 |
PROBLEM TO BE SOLVED: To ensure resistance to running-on of a ball to improve the reliability and durability of compact office automation equipment. SOLUTION: Relation of diameter D<SB>a</SB>of each ball 8, 8, groove depth Hi of an inner ring track 4, and groove depth Ho of an outer ring track 6 is regulated. To say concretely, the sum of each groove depth Hi, Ho of these inner ring track 4 and the outer ring track 6, (Hi+Ho), is set to be 0.34 D<SB>a</SB>to 0.50 D<SB>a</SB>. At the same time, the groove depth Hi of the inner ring track 4 is not less than the groove depth Ho of the outer ring track 6. As a result, contact ellipse in a rolling contact part of rolling faces of each ball 8, 8, the inner ring track 4, and the outer ring track 6 hardly reaches end fringes of the inner ring track 4 and the outer ring track 6. COPYRIGHT: (C)2003,JPO
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