US 4,871,268 A · Rolling bearing

Abstract

A rolling bearing has an inner race, an outer race and a roller, at least one of the inner race, outer race and roller being made with an alloy steel consisting of two or more of 0.2 to 1.7% by weight of Mn, 0.2 to 1.2% by weight of Si, 0.2 to 1.7% by weight of Cr, 0.1 to 0.3% by weight of Mo and 0.1 to 1.0% by weight of Ni, 0.4 to 0.7% by weight of C and the balance of Fe, and by subjecting the alloy steel to carburizing hardening to obtain (a) an additional carbon content at the surface portion of 0.35 to 0.6% by weight and (b) a dissolved carbon content at the surface portion of 0.75 to 1.1% by weight, and having: (c) a hardness at the core portion as H.sub.R C of 57 to 64 and (d) a difference in hardness between the surface portion and the core portion within .+-.5 of H.sub.R C.

Claims12

Dependent claims

A rolling-type bearing having an inner race, an outer race and a rolling member, at least one of said inner race, outer race and rolling member being made with an alloy steel consisting essentially of Fe with 0.4 to 0.7% by weight of C and at least two elements selected from the group consisting of 0.2 to 1.7% by weight of Mn, 0.2 to 1.2% by weight of Si, 0.2 to 1.7% by weight of Cr, 0.1 to 0.3% by weight of Mo and 0.1 to 1.0% by weight of Ni, said alloy having been subjected to carburizing hardening to obtain

(a) a carburized amount at the surface portion of 0.35 to 0.6% by weight and
(b) a dissolved carbon content at the surface portion of 0.75 to 1.1% by weight, and having
(c) a hardness at the core portion as H.sub.R C of 57 to 64 and
(d) a difference in hardness between the surface portion and the core portion within .+-.5 as H.sub.R C.

1 more element

Dependencies are inferred from the claim text.

Rolling bearing

Life of this patent

Rolling bearing

Life of this patent

Abstract

Claims12