ROLLING PART AND POWER TRANSMISSION PART

(19)

(11)

EP 1 507 090 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	published in accordance with Art. 158(3) EPC

(48)	Corrigendum issued on:
	11.05.2005 Bulletin 2005/19

(43)	Date of publication:
	16.02.2005 Bulletin 2005/07

(21)	Application number: 03728107.8

(22)	Date of filing: 19.05.2003

(51)	International Patent Classification (IPC)⁷: F16C 33/32, C21D 1/18, C22C 38/00, B60B 35/14

(86)	International application number:
	PCT/JP2003/006237

(87)	International publication number:
	WO 2003/100277 (04.12.2003 Gazette 2003/49)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

(30)

Priority:

23.05.2002 JP 2002149428

(71)	Applicant: NTN CORPORATION
	Osaka-shi Osaka 550-0003 (JP)

(72)	Inventors:
	MATSUBARA, Yukio, c/o NTN Corporation Kuwana-shi, Mie 511-0811 (JP) MAEDA, Kikuo, c/o NTN Corporation Kuwana-shi, Mie 511-0811 (JP)

(74)	Representative: GROSSE BOCKHORNI SCHUMACHER
	Patent- und Rechtsanwälte Forstenrieder Allee 59 81476 München 81476 München (DE)

(54)	ROLLING PART AND POWER TRANSMISSION PART

(57) There is provided a rolling component formed of a steel material of the medium carbon steel level that provides a rolling life improved to be comparable to that of bearing steel and also provides improved characteristic against surface-cracking, and a power transmission component including the rolling component. To achieve this, the rolling component is formed of steel having an induction hardened portion having a stress intensity factor range associated with tension associated-fatigue crack extension that has a lower limit ΔKth of 6.2 Mpa√m.