Title:
WHEEL BEARING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/139994
Kind Code:
A1
Abstract:
Provided is a wheel bearing device capable of improving indentation resistance at the outer side of an outer member by reducing a quenching crack and deterioration in crystal grain size as much as possible. The outer member (outer ring (2)) is to have an inner-side induction-hardened part (9a) formed by means of induction hardening along an inner-side outer raceway surface (2g) and an outer-side induction-hardened part (9b) formed by means of induction hardening along an outer-side outer raceway surface (2h), wherein the outer-side induction-hardened part 9b has a deeper hardened layer depth (D) than the hardened layer depth E of the inner-side induction-hardened part (9a), and the inner-side induction-hardened part (9a) and the outer-side induction-hardened part (9b) are separated from each other.
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Inventors:
MATSUTANI RYOTA (JP)
Application Number:
PCT/JP2022/046437
Publication Date:
July 27, 2023
Filing Date:
December 16, 2022
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C21D9/40; B60B35/02; F16C19/18; F16C33/58; F16C33/64
Foreign References:
| JP2014142054A | 2014-08-07 | |||
| JP2014077527A | 2014-05-01 | |||
| JP2010241189A | 2010-10-28 | |||
| JP2017082824A | 2017-05-18 | |||
| JP2000211310A | 2000-08-02 |
Attorney, Agent or Firm:
YANO INTERNATIONAL PATENT ATTORNEYS OFFICE, P.C. (JP)
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