Title:
MANUFACTURING METHOD OF OUTER RING OF ROLLING BEARING UNIT FOR SUPPORTING WHEEL
Document Type and Number:
Japanese Patent JP2017082824
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method capable of preventing a heat treatment hardened layer formed on an outer ring raceway at an axial outer side of a large diameter, from being excessively deepened, and forming a cylindrical face portion (slide-contact face of shoe in grinding outer ring raceway) superior in circularity, on a part near an axial outer end of an outer peripheral face.SOLUTION: A second intermediate material 24 including a cylindrical portion 25 such that shown in (C) is manufactured, and then an enlarged diameter portion 33 shown in (D) is formed on an axial outer part of the cylindrical portion 25. Then cutting work is performed on an inner peripheral face of the enlarged diameter portion 33 to form an outer ring raceway 4a at an axial outer side as shown in (E). Then a heat treatment hardened layer 11a is formed on the outer ring raceway 4a at the axial outer side by induction hardening as shown in (F), before performing the cut work onto an outer peripheral face of the enlarged diameter portion 33. Then the cutting work is performed on an outer peripheral face of the enlarged diameter portion 33 to form a cylindrical portion 9 for slide-contact of a shoe as shown in (G).SELECTED DRAWING: Figure 3
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Inventors:
TANABE MASAYUKI
Application Number:
JP2015208822A
Publication Date:
May 18, 2017
Filing Date:
October 23, 2015
Export Citation:
Assignee:
NSK LTD
International Classes:
F16C33/64; B60B35/02; F16C19/18
Attorney, Agent or Firm:
Kiwa Patent Office