	US 7,490,583 B2
	Full-type rolling bearing and roller cam follower for engine
Tadatoshi Suzuki, Iwata (Japan); Kenichi Ichikawa, Iwata (Japan); Kikuo Maeda, Kuwana (Japan); and Yukio Fujii, Kuwana (Japan)
Assigned to NTN Corporation, Osaka (Japan)
Filed on Oct. 17, 2003, as Appl. No. 10/686,766.
Claims priority of application No. 2002-303036 (JP), filed on Oct. 17, 2002; and application No. 2003-053505 (JP), filed on Feb. 28, 2003.
Prior Publication US 2004/0079310 A1, Apr. 29, 2004
Int. Cl. F01L 1/18 (2006.01)

U.S. Cl. 123—90.44 [123/90.15; 123/90.16; 123/90.39; 74/53; 74/567]

29 Claims

1. A full-type rolling bearing formed of an outer ring, an inner ring and rollers that are made of steel, wherein

at least one of said outer ring, inner ring and rollers contains a non-diffusible hydrogen content of at most 0.5 ppm, carbon in an amount of 0.95% to 1.10%, silicon in an amount of 0.15% to 0.35%, manganese in an amount of at most 0.5%, phosphorous in an amount of at most 0.025%, sulfur in an amount of at most 0.025%, chromium in an amount of 1.30% to 1.60%, and molybdenum in an amount of less than 0.08%, with the remainder formed of Fe and unavoidable impurities, has a carbonitrided layer in its surface layer, and the austenite crystal grain size number of the surface layer is greater than 10, wherein

after at least one of said outer ring, inner ring and rollers is carbonitrided at a carbonitriding temperature equal to or higher than the A1 transformation temperature, said at least one of said outer ring, inner ring and rollers is cooled to a temperature lower than the A1 transformation temperature and then heated to a quenching temperature of 790° C.–815° C. and thereby quenched.