Title:
NITRIDED VALVE LIFTER AND METHOD FOR MANUFACTURE THEREOF
Document Type and Number:
WIPO Patent Application WO/2004/081252
Kind Code:
A1
Abstract:
A method for manufacturing a nitrided valve lifter, which comprises subjecting a sliding surface (2) of a valve lifter (1) or a shim (3) to a carbulizing quenching tempering treatment, and then subjecting the resultant surface to a gas soft nitriding treatment so as for the surface to have a compound layer (6) having a thickness of 1 to 5 μm formed thereon and to have a surface hardness of Hv 660 or greater. The nitride layer on the surface is a dense compound layer (6) exhibiting a porosity of 1 % or less.
Inventors:
YAMASHITA KATSUHIRO (JP)
UENO YASUSHI (JP)
SHITO KAZUYUKI (JP)
MUNEMURA SHINNOSUKE (JP)
SUGAWARA CHIKARA (JP)
UENO YASUSHI (JP)
SHITO KAZUYUKI (JP)
MUNEMURA SHINNOSUKE (JP)
SUGAWARA CHIKARA (JP)
Application Number:
PCT/JP2004/003022
Publication Date:
September 23, 2004
Filing Date:
March 09, 2004
Export Citation:
Assignee:
RIKEN KK (JP)
ORIENTAL ENGINEERING CO LTD (JP)
YAMASHITA KATSUHIRO (JP)
UENO YASUSHI (JP)
SHITO KAZUYUKI (JP)
MUNEMURA SHINNOSUKE (JP)
SUGAWARA CHIKARA (JP)
ORIENTAL ENGINEERING CO LTD (JP)
YAMASHITA KATSUHIRO (JP)
UENO YASUSHI (JP)
SHITO KAZUYUKI (JP)
MUNEMURA SHINNOSUKE (JP)
SUGAWARA CHIKARA (JP)
International Classes:
C23C8/02; C23C8/26; C23C8/34; F01L1/16; (IPC1-7): C23C8/32; C23C8/02; C23C8/26; F01L1/14
Foreign References:
| JP2002212703A | 2002-07-31 | |||
| JPH11100655A | 1999-04-13 | |||
| JPS62253908A | 1987-11-05 | |||
| JPH11324858A | 1999-11-26 | |||
| JP2000303161A | 2000-10-31 | |||
| JPH10245668A | 1998-09-14 | |||
| JPH05340213A | 1993-12-21 |
Other References:
See also references of EP 1602743A4
Attorney, Agent or Firm:
Kuwabara, Hideaki (4th Floor Onarimon Daini Bldg., 16-12,
Shinbashi 6-chom, Minato-ku Tokyo, JP)
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