BEARING RING AND ROLLER BEARING HAVING SAID BEARING RING

Title:

BEARING RING AND ROLLER BEARING HAVING SAID BEARING RING

Document Type and Number:

WIPO Patent Application WO/2015/141807

Kind Code:

A1

Abstract:

In the present invention, by means of compression molding a partially diffused alloy steel powder and then sintering, a sintered metal element (10') is formed, and by means of plastic working of the sintered metal element (10'), a raceway surface (2) is formed, producing a bearing ring (1). At least the risk volume of the bearing ring (1) is considered a predicted volume, and the square root (√areamax) of the envelope area of the largest pore estimated to be present in at least the predicted volume is set to be less than 50 μm. As a result, provided is a roller bearing that, while being low in cost, has an increased rolling fatigue life.

Inventors:

YASHIRO NAOKI (JP)
ITOU YUUTA (JP)
OKUNO TAKAHIRO (JP)
OOHIRA KOUYA (JP)

Application Number:

PCT/JP2015/058368

Publication Date:

September 24, 2015

Filing Date:

March 19, 2015

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
YASHIRO NAOKI (JP)
ITOU YUUTA (JP)
OKUNO TAKAHIRO (JP)
OOHIRA KOUYA (JP)

International Classes:

F16C33/64; B22F1/00; B22F3/10; B22F3/24; B22F5/00; C22C38/00; C22C38/12; F16C19/06; F16C33/62; F16C33/78

Foreign References:

JP2002294388A	2002-10-09
JP2006503982A	2006-02-02
JP2013053358A	2013-03-21
JPH05263181A	1993-10-12
JPH06145845A	1994-05-27

Other References: