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US 5,873,956 AGranted
Rolling bearing
AssigneeNsk Ltd.
InventorsSusumu Tanaka, Kenji Yamamura, Manabu Ohori
Life of this patent
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AssigneeNsk Ltd.
InventorsSusumu Tanaka, Kenji Yamamura, Manabu Ohori
Estimating the term…
In order to provide rolling bearings of high performance using case hardened stainless steels that are superior to the conventional martensite base stainless steels in terms of corrosion resistance, rolling fatigue strength and wear resistance and which also have high core toughness, at least one member of the rolling bearing selected from among the inner race, the outer race and the rolling elements is made of an alloy steel consisting essentially of less than 0.5 wt % C, 8.0 to 20.0 wt % Cr, 0.1 to 1.5 wt % Mn, 0.1 to 2.0 wt % Si and the balance of Fe and incidental impurity elements; the relationship between the C and Cr contents satisfies 0.04 Cr (wt %)-0.39.ltoreq.C (wt %).ltoreq.-0.05 Cr (wt %)+1.41; the bearing also has a surface layer that is formed by nitriding or carbonitriding at a temperature below Ac.sub.1, subsequent heating at a temperature of 900.degree. to 1,200.degree. C., hardening, a subzero treatment and tempering.
A rolling bearing comprising an inner race, an outer race and rolling elements, in which at least one member selected from among said inner race, said outer race and said rolling elements is made of an alloy steel consisting essentially of less than 0.5 wt % C, 8.0 to 20.0 wt % Cr, 0.1 to 1.5 wt % Mn, 0.1 to 2.0 wt % Si and the balance of Fe and incidental impurity elements, with the relationship between the C and Cr contents satisfying:
A rolling bearing comprising an inner race, an outer race and rolling elements, in which at least one member selected from among said inner race, said outer race and said rolling elements is made of an alloy steel consisting essentially of less than 0.5 wt % C, 8.0 to 20.0 wt % Cr, 0.1 to 1.5 wt % Mn, 0.1 to 2.0 wt % Si, 0.05 to less than 0.2 wt % of N, and the balance of Fe and incidental impurity elements, with the relationship among the C, Cr and N contents satisfying:
A rolling bearing comprising an inner race, an outer race and rolling elements, wherein at least one member selected from among said inner race, said outer race and said rolling elements is made of an alloy steel consisting essentially of less than 0.3 wt % C, 8.0 to 20.0 wt % Cr, 0.1 to 1.5 wt % Mn, 0.1 to 2.0 wt % Si, 0.4 to 3.0 wt % Mo, 0.4 to 2.0 wt % V, 1.0 to 3.5 wt % Ni, 1.0 to 10.0 wt % Co, less than 0.2 wt % N and the balance of Fe and incidental impurity elements, and
A rolling bearing comprising an inner race, an outer race and rolling elements, wherein at least one member selected from among said inner race, said outer race and said rolling elements is made of an alloy steel consisting essentially of less than 0.3 wt % C, 8.0 to 20.0 wt % Cr, 0.1 to 1.5 wt % Mn, 0.1 to 2.0 wt % Si, 0.4 to 3.0 wt % Mo, 0.4 to 2.0 wt % V, 1.0 to 3.5 wt % Ni, 1.0 to 10.0 wt % Co, less than 0.2 wt % N and the balance of Fe and incidental impurity elements, and
Dependencies are inferred from the claim text.