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Title:
ROLLING BEARING UNIT FOR SUPPORTING WHEEL
Document Type and Number:
Japanese Patent JP2015028372
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To inexpensively provide a rolling bearing unit for supporting a wheel capable of preventing formation of an impression on an inner ring raceway and an outer ring raceway in forming a caulking portion while keeping fitting force of a seal member.SOLUTION: An outer ring 2b has outer ring raceways 5a, 5b of double row on its inner peripheral face, and fitting cylindrical portions 23, 23a for fitting and fixing a seal member to axial end portions. Conical rollers 4 are rollably disposed between the inner ring raceways 7a, 7b of double row disposed on the outer peripheral face of a hub 3b and both outer ring raceways. Heat treatment hardened layers 22, 22a disposed on both outer ring raceways, are partially extended to axial intermediate portions of the fitting cylindrical portions, and fitting faces 24, 24a of the seal member are fitted only to the parts of the heat treatment hardened layers of the fitting cylindrical portions.

Inventors:
MAEDA YASUHIRO
Application Number:
JP2013158437A
Publication Date:
February 12, 2015
Filing Date:
July 31, 2013
Export Citation:
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Assignee:
NSK LTD
International Classes:
F16C19/38; B60B35/02; F16C33/64; F16C33/78; F16C35/063; F16C43/04