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Title:
CRANKSHAFT EXCELLENT IN FLEXURAL FATIGUE STRENGTH
Document Type and Number:
WIPO Patent Application WO/2005/100626
Kind Code:
A1
Abstract:
A crankshaft being excellent in flexural fatigue strength and having a quench hardened layer on the surface of a crank pin portion and a journal portion thereof, characterized in that it has a chemical composition, in mass %, that C: 0.40 to 0.51 %, Si: 0.30 to 0.80 %, Mn: 0.50 to 1.50 %, Al: 0.040 % or less (including 0 %), Ti: 0.005 to 0.06 %, Mo: 0.15 to 0.50 %, B: 0.0005 to 0.0030 %, S:0.06 % or less, P: 0.02 % or less, Cr: 0.2 % or less, and the balance: Fe and inevitable impurities, the base material thereof has a bainite structure and/or a martensite structure in a total proportion of 10 % or more, a surface-hardened layer after induction hardening has an old austenite grain diameter of 10 μm or less over the whole thickness of the hardened layer, and a fillet r part of the crank pin portion and the journal portion has a flexural fatigue strength of 800 MPa or more. The above crankshaft exhibits a flexural fatigue strength superior to that of a conventional one.

Inventors:
HAYASHI TOHRU (JP)
OMORI YASUHIRO (JP)
TOYOOKA TAKAAKI (JP)
MIZUNO KOKI (JP)
MATSUDA HIDEKI (JP)
KOBAYASHI SEIJI (JP)
Application Number:
PCT/JP2005/007485
Publication Date:
October 27, 2005
Filing Date:
April 13, 2005
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
HONDA MOTOR CO LTD (JP)
MATSUZAKI AKIHIRO (JP)
HAYASHI TOHRU (JP)
OMORI YASUHIRO (JP)
TOYOOKA TAKAAKI (JP)
MIZUNO KOKI (JP)
MATSUDA HIDEKI (JP)
KOBAYASHI SEIJI (JP)
International Classes:
C22C38/00; C22C38/60; F16C3/06; F16C3/08; (IPC1-7): C22C38/00; C22C38/60; F16C3/06
Foreign References:
JPH1171633A1999-03-16
JPH05279795A1993-10-26
JPH0853714A1996-02-27
JP2005060723A2005-03-10
Attorney, Agent or Firm:
Ochiai, Kenichiro c/o Patent, Application Dept (JFE TECHNO-RESEARCH CORPORATION 7th Floor, Yanagiya Building, 1-10, Nihonbashi 2-chom, Chuo-ku Tokyo 27, JP)
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