| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbocharger structure at low cost which attain compatibility between response improvement and sufficient durability. SOLUTION: A relationship between a ratio fe of a radius of curvature r2 of cross-sectional shape of an outer ring raceway 2 as opposed to a diameter d10 of a ball 10 and a ratio fi of a radius of curvature r5 of cross-sectional shape of an inner ring raceway 5 as opposed to the diameter d10 of the ball 10 is set at 111.5<100.(fe+fi)<=120. |
