公开(公告)号：US20030002763A1

公开(公告)日：2003-01-02

申请号：US10219325

申请日：2002-08-16

Applicant: NSK LTD.

Inventor： Hirohide Ishida ,  Hiroya Miyazaki

IPC: B23P017/00 ,  F16C013/00

CPC classification number: B60B27/0084 ,  B23P11/00 ,  B60B27/00 ,  F16C19/185 ,  F16C19/186 ,  F16C43/04 ,  F16C2326/02 ,  Y10S384/913 ,  Y10T29/49535 ,  Y10T29/49536 ,  Y10T29/49682 ,  Y10T29/49696 ,  Y10T29/49709 ,  Y10T29/49915

Abstract: A cylindrical portion 10 is not quenched, and its hardness of a cylindrical portion 10 is set at Hv200 to 300. An average cross sectional area of the crystal particle in this portion is set to be within 0.03 mm2. Accordingly, when a caulking portion is formed by expanding the cylindrical portion 10b to an inner ring 3 to a hub 2b made of carbon steel, cracks or the like are not formed in the resultant caulking portion.