| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the bearing performance such as the seizure resisting performance or the low torque performance, and simultaneously improve the workability of a relief groove of a collar part to reduce cost by obtaining an optimum range of relief dimension of the collar part. SOLUTION: Plural tapered rollers are imposed between an outer ring and an inner ring so that they can freely roll, and a collar part is formed on the side of the inner ring. When the grinding relief dimension of the collar part side is (c), the height of a point of contact of the collar part with the end face of the tapered roller is (h), and the semi-minor axis of a contact ellipse formed by the contact of the collar part with the end face of the tapered roller is (b), the rate of relief margin of the contact ellipse formed by the contact of the collar part with the end face of the tapered roller is set to the following equation; -0.6<=(h-b-c)/b<=2.</p> |
