| 摘要 |
PROBLEM TO BE SOLVED: To reduce the misalignment between both pulleys for winding a belt and to extend the bearing service life, in a radial ball bearing for supporting a pulley shaft of a belt-type continuously variable transmission. SOLUTION: For an inner ring 1, the percentage (%) of the ratio (Ri/D) of curvature radius (Ri) of a raceway groove to ball diameter (D) is set at 51.0%. In an outer ring 2, the percentage (%) of the ratio (Re/D) of curvature radius (Re) of the raceway groove to the ball diameter (D) is set so thatαvalue shown by the equationα=(R/D)×100+0.25[Cr] is 53.25 or more, where [Cr] is chromium (Cr) content (mass%) in an alloy steel used as the material. COPYRIGHT: (C)2004,JPO
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