Title:
METHOD FOR MANUFACTURING INTERNAL COMBUSTION ENGINE CAM SHAFT
Document Type and Number:
WIPO Patent Application WO/2013/046445
Kind Code:
A1
Abstract:
The purpose is to provide a cam shaft manufacturing method such that improvements in wear characteristics, such as pitting resistance and scuffing resistance, can be stably obtained. In order to achieve the purpose, a method for manufacturing an internal combustion engine cam shaft is provided with a heat process step of heating a cam shaft formed by assembling a cam piece of a sintered material onto a shaft body made of steel pipe to a sintering temperature by a heat process apparatus, and a cooling process step of cooling the heat-processed cam shaft by a cooling process apparatus. The cooling process step involves cooling in two stages; i.e., a first stage cooling process step for slow cooling by disposing the cam shaft in a state of being surrounded by a graphite plate which is installed in the cooling process apparatus in a peripherally enclosing manner, and a second stage cooling process step for rapid cooling by causing coolant gas injected into the cooling process apparatus to be circulated by a fan.
Inventors:
FUNABASHI TAKASHI (JP)
TAKEGUCHI SHUNSUKE (JP)
TAKEGUCHI SHUNSUKE (JP)
Application Number:
PCT/JP2011/072597
Publication Date:
April 04, 2013
Filing Date:
September 30, 2011
Export Citation:
Assignee:
NIPPON PISTON RING CO LTD (JP)
FUNABASHI TAKASHI (JP)
TAKEGUCHI SHUNSUKE (JP)
FUNABASHI TAKASHI (JP)
TAKEGUCHI SHUNSUKE (JP)
International Classes:
F01L1/04; F16C3/02
Foreign References:
| JPH0436438A | 1992-02-06 | |||
| JPH11350029A | 1999-12-21 | |||
| JPH06193708A | 1994-07-15 |
Attorney, Agent or Firm:
YOSHIMURA, KATSUHIRO (JP)
Katsuhiro Yoshimura (JP)
Katsuhiro Yoshimura (JP)
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Claims: