| 摘要 |
PROBLEM TO BE SOLVED: To provide a needle roller bearing of a long life even when used in a thin lubrication environment like an air conditioner compressor or the like. SOLUTION: This needle roller bearing is provided with an inner ring 1 having a raceway surface 1a, an outer ring 2 having a raceway surface 2a, and a plurality of needle rollers 3 rotatably disposed between both raceway surfaces 1a and 2a. Both raceway surfaces 1a and 2a are composed of alloy steel of a nitrogen density of 0.1 mass% or more. The needle rollers 3 are composed of alloy steel containing 8-18 mass% chrome, and 0.5-1.2 mass% in total of carbon and nitrogen. COPYRIGHT: (C)2004,JPO
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