Title:
CONSTANT VELOCITY UNIVERSAL JOINT HAVING EXCELLENT ROLLING FATIGUE PROPERTY, POWER TRANSMISSION SHAFT HAVING EXCELLENT TORSIONAL FATIGUE PROPERTY, AND PROCESSES FOR PRODUCING THEM
Document Type and Number:
WIPO Patent Application WO/2007/086215
Kind Code:
A1
Abstract:
This invention provides a constant velocity universal joint having an excellent rolling fatigue property, in which a carbon steel for machine structures having machinability favorably comparable with conventional Pb-added free-cutting steels and, at the same time, having excellent properties after nitriding is used in at least a part of the constant velocity universal joint, and a power transmission shaft having an excellent torsional fatigue property. In the constant velocity universal joint, an outer member and an inner member comprise a steel having a graphite phase of which the carbon content in the molding of the members is not less than 5% by mass. In the surface part after induction hardening/tempering, residual graphite particles and graphite-derived pores have an equivalent circular diameter of not more than 7 μm. The power transmission shaft comprises a constant velocity universal joint provided at one end of a stub shaft. The stub shaft comprises a steel having a graphite phase of which the carbon content in the molding is not less than 5% by mass. In the surface part after induction hardening/tempering, residual graphite particles and graphite-derived pores have an equivalent circular diameter of not more than 7 μm.
Inventors:
IWAMOTO TAKASHI (JP)
TOMITA KUNIKAZU (JP)
KIMURA HIDETO (JP)
OMORI YASUHIRO (JP)
TOYOOKA TAKAAKI (JP)
YOSHIDA KAZUHIKO (JP)
TOMITA KUNIKAZU (JP)
KIMURA HIDETO (JP)
OMORI YASUHIRO (JP)
TOYOOKA TAKAAKI (JP)
YOSHIDA KAZUHIKO (JP)
Application Number:
PCT/JP2006/325444
Publication Date:
August 02, 2007
Filing Date:
December 14, 2006
Export Citation:
Assignee:
JFE STEEL CORP (JP)
NTN TOYO BEARING CO LTD (JP)
IWAMOTO TAKASHI (JP)
TOMITA KUNIKAZU (JP)
KIMURA HIDETO (JP)
OMORI YASUHIRO (JP)
TOYOOKA TAKAAKI (JP)
YOSHIDA KAZUHIKO (JP)
NTN TOYO BEARING CO LTD (JP)
IWAMOTO TAKASHI (JP)
TOMITA KUNIKAZU (JP)
KIMURA HIDETO (JP)
OMORI YASUHIRO (JP)
TOYOOKA TAKAAKI (JP)
YOSHIDA KAZUHIKO (JP)
International Classes:
C22C38/00; C21D8/00; C21D9/28; C21D9/40; F16D3/205; F16D3/227; F16D3/229
Foreign References:
| JP2000213553A | 2000-08-02 | |||
| JP2005113157A | 2005-04-28 | |||
| JP2000074082A | 2000-03-07 | |||
| JPH08283847A | 1996-10-29 | |||
| JP2000204432A | 2000-07-25 |
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JFE Techno-Research Corporation 7th Floor, Yanagiya Building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, JP)
Download PDF: