Rolling bearing for alternator

摘要

A rolling bearing includes a plurality of rolling elements disposed between an inner race and an outer race and a retainer retaining the rolling elements. Lubricating grease is sealed in the bearing in an amount of not less than 20% of an entire spatial volume of an interior of the rolling bearing and not more than 80% of a stationary spatial volume of the interior of the rolling bearing. The lubricating grease includes a base oil having a dynamic viscosity at 40° C. of 13-73 cSt, and a thickening agent of aromatic urea family. The entire spatial volume is an entire interior volume of the bearing minus a total volume of the rolling elements and the retainer, and the stationary spatial volume is a portion of the entire spatial volume where neither the rolling elements nor the retainer passes while the bearing is rotating.

主权项

1. A rolling bearing for use in an alternator, the rolling bearing comprising:
an inner race; an outer race which is concentric with the inner race; a plurality of rolling elements disposed between the inner race and the outer race; a retainer retaining the rolling elements; seal members fixed to the outer race and sealing openings at axial ends of the rolling bearing; and lubricating grease sealed in the bearing in an amount of not less than 20% of an entire spatial volume of an interior of the rolling bearing and not more than 80% of a stationary spatial volume of the interior of the rolling bearing, wherein the lubricating grease includes a base oil having a dynamic viscosity at 40° C. of 13-73 cSt, and a thickening agent of aromatic urea family, wherein the entire spatial volume is an entire interior volume of the bearing minus a total volume of the rolling elements and the retainer, wherein the stationary spatial volume is a portion of the entire spatial volume where neither the rolling elements nor the retainer passes while the bearing is rotating, and wherein the rolling bearing is a radial bearing and the rolling elements are balls, and the stationary spatial volume includes a space on each side of the balls in an axial direction of the radial bearing.