Title:
GEAR AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2014/203610
Kind Code:
A1
Abstract:
A gear which has tooth parts and tooth-root parts and which has undergone, after the forming, carburizing and quenching subsequent thereto, wherein the chemical composition of the raw material steel contains 0.10 to 0.30% of C, 0.01 to 3.00% of Ni, 0.50 to 3.00% of Si, 0.20 to 1.00% of Cr, 0.30 to 3.00% of Mn, at most 0.10% of Mo, at most 0.030% of P, at most 0.05% of N, at most 0.030% of S, and 0.01 to 1.00% of Cu with the balance being Fe and unavoidable impurities, and satisfies the relationship: Si% + Ni% + Cu% - Cr% > 0.5. Further, a tempered region which exhibits a hardness lower than that of martensite is formed by partial tempering in the surface layer in an edge part (16) in the axial end portions of the tooth and tooth-root parts, while the surface layer in the other part is composed of martensite formed by the quenching.
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Inventors:
ETO YUTAKA (JP)
MIZUNO KOKI (JP)
MATSUMURA YASUSHI (JP)
YAMAGUCHI KOHEI (JP)
MIZUNO KOKI (JP)
MATSUMURA YASUSHI (JP)
YAMAGUCHI KOHEI (JP)
Application Number:
PCT/JP2014/061146
Publication Date:
December 24, 2014
Filing Date:
April 21, 2014
Export Citation:
Assignee:
AISIN AW CO (JP)
DAIDO STEEL CO LTD (JP)
DAIDO STEEL CO LTD (JP)
International Classes:
F16H55/06; C21D1/06; C21D9/32; C22C38/00; C22C38/58; C23C8/22; C23C8/80; F16H55/17; F16H55/22
Foreign References:
| JP2007291486A | 2007-11-08 | |||
| JP2008280610A | 2008-11-20 | |||
| JP2005048292A | 2005-02-24 | |||
| JPH07316640A | 1995-12-05 | |||
| JPH0849014A | 1996-02-20 | |||
| JP2010001527A | 2010-01-07 |
Attorney, Agent or Firm:
COSMOS PATENT OFFICE (JP)
Patent business corporation cosmos patent firm (JP)
Patent business corporation cosmos patent firm (JP)
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