PINION SHAFT - KOYO SEIKO CO

Title:

PINION SHAFT

Document Type and Number:

WIPO Patent Application WO/2005/100823

Kind Code:

A1

Abstract:

A pinion shaft (7) formed of non-quenched/tempered steel as the raw material has shaft sections (71, 72) and a section (70) where pinion teeth are formed and which is continuous to the shaft sections (71, 72). The section (70) where pinion teeth are formed includes pinion teeth (7a) and tooth bottom sections (7b). In the section (70) where pinion teeth are formed and the shaft sections (71, 72) are provided a hardened layer (80) where induction hardening and tempering are applied. The steel contains 0.45 - 0.55 mass percent C, 0.10 - 0.50 mass percent Si, 0.15 - 0.25 mass percent Mo, and 0.0005 - 0.005 mass percent B. The surface hardness of the section (70) where pinion teeth are formed and of the shaft sections (71, 72) is 650 - 760 HV in Vickers hardness.

Inventors:

TAKEI TOMOYUKI (JP)
OOTSUKA SHINTA (JP)
TSUKAMOTO OSAMU (JP)
TAOKA NOBUYUKI (JP)

Application Number:

PCT/JP2005/007563

Publication Date:

October 27, 2005

Filing Date:

April 14, 2005

Export Citation:

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Assignee:

KOYO SEIKO CO (JP)
TAKEI TOMOYUKI (JP)
OOTSUKA SHINTA (JP)
TSUKAMOTO OSAMU (JP)
TAOKA NOBUYUKI (JP)

International Classes:

B62D3/12; C21D1/18; F16H55/06; F16H55/17; C21D1/25; C21D9/28; (IPC1-7): F16H55/06

Foreign References:

JP2004027292A	2004-01-29
JP2002194482A	2002-07-10
JP2002069566A	2002-03-08
JP2000144307A	2000-05-26
JPH11269601A	1999-10-05
JP2003253395A	2003-09-10
JP2002332535A	2002-11-22
JPH10324946A	1998-12-08
JPH11269552A	1999-10-05
JP2004027292A	2004-01-29
JP2002194482A	2002-07-10
JP2002069566A	2002-03-08
US2207289A	1940-07-09

Other References: