LUBRICANT COMPOSITION AND BEARING PRELUBRICATED WITH LUBRICANT COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a lubricant composition capable of preventing, when used in an environment entailing contact thereof with a ferrous metal, abrasion on a surface of the ferrous metal due to hydrogen embrittlement and to provide a bearing lubricated by the lubricant composition.SOLUTION: The bearing 1 prelubricated with a lubricant composition possesses an inner race 2 and an outer race 3 as bearing members consisting of a ferrous metal, and a lubricant composition 7 enclosed therein for lubricating the bearing member, wherein the lubricant composition 7 is a lubricant oil or grease including a base oil and a polyethyleneimine having a number-average molecular weight of 200-12000.