To provide an inexpensive rolling bearing which has excellent toughness and secures a long life even when used under an environment in which water or solid foreign matter is mixed in lubricant.
An outer ring 2 of the cylindrical roller bearing 10 is composed of high-carbon steel having a content of carbon of≥0.6 mass%. A hardened layer subjected to quenching by heat treatment including high frequency quenching treatment is formed on a surface of the outer ring 2 including a raceway surface 2a, and a non-quenched part not subjected to quenching is formed in a core part. The surface hardness of the raceway surface 2a is≥Hv 651, and the hardness of the core part is≤Hv 500. Further, the residual austenite amount in the raceway surface 2a is≥12 vol.% and ≤40 vol.%. The valid hardened layer depth Y0 of the raceway surface 2a satisfies the expression of 0.07×Dw<Y0<0.07×Dw+5. The maximum diameter of nonmetallic inclusions estimated by external statistics method is≤35 μm.
TOBITAKA HIDEYUKI
KATAYAMA YUKARI
| JP2003156054A | 2003-05-30 | |||
| JP2009168090A | 2009-07-30 | |||
| JP2010024530A | 2010-02-04 |
Megumi Konishi
Hide Tanaka Tetsu
Ichi Hirose
Toru Miyasaka
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