TAPERED ROLLER BEARING

摘要

A tapered roller bearing includes an outer ring 23, an inner ring 22, a tapered roller 24 interposed between the outer ring 23 and the inner ring 22, and a cage 25 holding the tapered roller 24. The tapered roller bearing is used in an idler portion of an automobile transmission that switches between an idle state in which the outer ring 23 rotates freely in relation to the inner ring 22 and a shift state in which the outer ring 23 rotates synchronously with the inner ring 22. The tapered roller bearing includes a fretting suppressing means configured by a ratio of dynamic load rating Cr to static load rating Cor being set to Cor/Cr‰¥1.4.