Title:
MANUFACTURING METHOD OF OUTER RING OF WHEEL SUPPORT ROLLING BEARING UNIT, AND WHEEL SUPPORT ROLLING BEARING UNIT
Document Type and Number:
Japanese Patent JP2023055544
Kind Code:
A
Abstract:
To provide a manufacturing method of an outer ring of a wheel support rolling bearing unit having desired depths of heat-treated hardened layers at both sides of a center part side and a both-end part side of a double-row outer ring raceway, and capable of preventing the protrusion of the heat-treated hardened layers to an external peripheral face, and also to provide the wheel support rolling bearing unit.SOLUTION: A manufacturing method of an outer ring of a wheel support rolling bearing unit comprises: a forging step for forming a cylindrical member 20A whose internal peripheral face becomes large in a diameter at an axial both-end part side rather than an axial center part side; a diameter expansion step for expanding a diameter of the internal peripheral face of the cylindrical member 20A so that an external peripheral face 28a of the cylindrical member 20A becomes large in a diameter at the axial both-end part side rather than the axial center part side; an induction heat treatment step for applying induction heat treatment to an outer ring raceway 22 and forming a heat-treated hardened layer 23 at the outer ring raceway 22; and a lathe turning step for lathe-turn finishing the external peripheral face 28a of the outer ring to form a prescribed shape after the induction heat treatment step.SELECTED DRAWING: Figure 1
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Inventors:
TAKANASHI HARUMI
WAKABAYASHI TATSUO
WAKABAYASHI TATSUO
Application Number:
JP2021165018A
Publication Date:
April 18, 2023
Filing Date:
October 06, 2021
Export Citation:
Assignee:
NSK LTD
International Classes:
F16C33/64; B60B35/02; B60B35/14; B60B35/18; F16C19/38
Attorney, Agent or Firm:
Patent Attorney Corporation Eiko Office