Invention Application
US20020037120A1 Rolling bearing device 有权
滚动轴承装置

  • Patent Title: Rolling bearing device
  • Patent Title (中): 滚动轴承装置
  • Application No.: US09867636
    Application Date: 2001-05-31
  • Publication No.: US20020037120A1
    Publication Date: 2002-03-28
  • Inventor: Susumu TanakaHiroyuki Ito
  • Applicant: NSK LTD.
  • Applicant Address: null
  • Assignee: NSK LTD.
  • Current Assignee: NSK LTD.
  • Current Assignee Address: null
  • Priority: JPP.2000-161337 20000531; JPP.2000-204802 20000706; JPP.2000-382732 20001215
  • Main IPC: F16C033/32
  • IPC: F16C033/32 F16C033/62 F16C033/34
Rolling bearing device
Abstract:
The material of inner ring, outer ring and rolling element is formed by a steel material having a chromium (Cr) content of 5% by weight or more. The material is then subjected to cutting. Thereafter, the material thus cut is subjected to heat treatment so that the surface hardness HRC of the worked material is 58 or more. Subsequently, the worked material is subjected to grinding. A working denatured layer present on the surface of the worked material is then removed. Subsequently, an oxide film comprising chromium atom and iron atom at a ratio (Cr/Fe) of 0.5 or more is formed on the surface of the worked material. Accordingly, it is possible to provide a rolling bearing excellent in corrosion resistance and fretting resistance.
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