Back to results
US 6,682,227 B2Granted
Rolling bearing component
AssigneeIna Walzlager Schaeffler oHG
InventorsKarl-Ludwig Grell, Günter Grube, Leo Müntnich
Life of this patent
Estimating the term…
Abstract
A needle case or needle bush produced without cutting for a thin-walled needle bearing is produced without cutting from a cold-rolled strip, which is a heat-treated steel which has the disclosed chemical composition and the disclosed mechanical characteristic values. After a heat treatment, a surface hardness of 860 to 880 HV and a core hardness of 550 to 650 HV are achieved.
Claims7
A thin-walled rolling bearing component, which is produced without cutting from a cold-rolled strip, wherein the cold-rolled strip is a heat-treated steel with the following mechanical characteristic values:
- a tensile strength ≦480 N/mm2
- an elongation at break ≧24%
- a yield strength ≦380 N/mm2
- an anisotropy value R of 0.85 to 1.05 with an ΔRmax=0.3 mm
- and after a heat treatment, the cold-formed rolling bearing component has a surface hardness of ≧700 HV and a core hardness of ≦650 HV.
2 more elements
Dependencies are inferred from the claim text.