GEARBOX SHAFT AND BEARING DEVICE USING SAME

Title:

GEARBOX SHAFT AND BEARING DEVICE USING SAME

Document Type and Number:

WIPO Patent Application WO/2023/022044

Kind Code:

A1

Abstract:

This gearbox shaft (1) is used for a gearbox and has a raceway surface on which needle rollers (2) roll. The gearbox shaft (1) comprises a base material (11) and a ferrosoferric oxide coating (12). The base material (11): is formed from a material selected from among chromium steel, chromium-molybdenum steel, and nickel-chromium-molybdenum steel; and has, on the surface thereof, a diffusion layer containing crystal grains of at least one of iron carbide, iron nitride, and iron carbonitride. The ferrosoferric oxide coating (12) is formed on the surface of the base material (11) and is disposed at least on the raceway surface.

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Inventors:

NAKATOCHI NAOKI (JP)
MIYAZAKI KEISUKE (JP)

Application Number:

PCT/JP2022/030282

Publication Date:

February 23, 2023

Filing Date:

August 08, 2022

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)

International Classes:

C21D9/28; C21D1/06; C22C38/00; C22C38/44; F16C3/02; F16C19/26; F16C33/62

Foreign References:

JPH0352416U	1991-05-21
JP2019108576A	2019-07-04
JP2012215288A	2012-11-08
JP2006144828A	2006-06-08

Attorney, Agent or Firm:

FUKAMI PATENT OFFICE, P.C. (JP)

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