BEARING COMPONENT AND ROLLING BEARING - NTN TOYO BEARING CO LTD

Title:

BEARING COMPONENT AND ROLLING BEARING

Document Type and Number:

WIPO Patent Application WO/2022/065200

Kind Code:

A1

Abstract:

This bearing component (10) is made of steel, and has a quench-hardened layer (11) at a surface thereof. The quench-hardened layer contains a plurality of martensite crystal grains. The martensite crystal grains are divided into a first group and a second group. The minimum value of the crystal grain sizes of martensite crystal grains belonging to the first group is greater than the maximum value of that of martensite crystal grains belonging to the second group. The value obtained by dividing the total area of the martensite crystal grains belonging to the first group by the total area of the martensite crystal grains is at least 0.3. The value obtained by dividing the total area of the martensite crystal grains belonging to the first group but excluding martensite crystal grains having a smallest crystal grain size and belonging to the first group, by the total area of the martensite crystal grains is less than 0.3. The average grain size of the martensite crystal grains belonging to the first group is at most 1.5 μm. The quench-hardened layer (11) further contains a plurality of cementite grains. The number density of the cementite grains having a grain size of at least 1 μm is not less than 0.025 gains/μm2.

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Inventors:

FUJIMURA NAOKI (JP)
YAMADA MASAHIRO (JP)
OHKI CHIKARA (JP)

Application Number:

PCT/JP2021/034141

Publication Date:

March 31, 2022

Filing Date:

September 16, 2021

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)

International Classes:

C21D9/40; C21D1/06; C21D1/76; C23C8/32; F16C19/06; F16C33/32; F16C33/34; F16C33/62; F16C33/64

Domestic Patent References:

WO2015105186A1

2015-07-16

Foreign References:

JP6626918B2	2019-12-25
JP2019108576A	2019-07-04
JP2012062515A	2012-03-29

Attorney, Agent or Firm:

FUKAMI PATENT OFFICE, P.C. (JP)

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