To provide a rolling bearing capable of preventing indentation start point type early exfoliation by maintaining a low tangential force acting on a rolling contact part without increasing the amount of residual austenite on the surface regarding any member.
Each ball 6 is formed by nitriding or carbonitriding treatment so that the nitrogen concentration of a rolling surface is 0.2-2.0 mass% and that the area rate of an Si-Mn-based nitride which is a nitride containing Si and Mn is 1-20%. The grain diameter of a nonmetallic inclusion included in a metallic material that constitutes at least one member out of an outer ring 3, an inner ring 5 and each ball 6 is restrained. Specifically, in regard to the larger dimensions of a maximum inclusion out of the dimensions of an oxide-based maximum inclusion and the dimensions of TiN-based maximum inclusion in an area 30,000 mm2 estimated by a method of extreme value statistics, when a square root (Dd) of the product of a length D and a breadth d is set as estimated inclusion dimensions (areamax), (areamax)30 m is to be satisfied.
| JP2006063356A | 2006-03-09 | |||
| JP2006308019A | 2006-11-09 | |||
| JP2007314811A | 2007-12-06 | |||
| JP2006063402A | 2006-03-09 |
| WO2007135929A1 | 2007-11-29 |
Takashi Daejeon
Masaki Muto
Go Shino
Kinzo Koyama
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