Internal-combustion engines – Poppet valve operating mechanism – Cam
Reexamination Certificate
2004-12-10
2009-12-08
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Cam
C123S090440, C029S888100, C029S557000, C072S352000
Reexamination Certificate
active
07628129
ABSTRACT:
A method of manufacturing a cam for a camshaft, comprising the steps of continuously applying, to a billet having a volume larger by a specified volume than a final product, a plurality of cold forging steps formed of a preliminary outline upsetting, an outline drawing, a simultaneous piercing of inner and outer diameter surfaces, a press-molding forming excess amount as burrs on the inner diameter surface, a piercing of the inner diameter surface for removing the burrs from the inner diameter surface, and a simultaneous ironing of the inner and outer diameter surfaces. The final finishing (machining) of a cam (profile) surface can be eliminated, and the final product of the cam for the camshaft having a high dimensional accuracy can be provided.
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Kurasawa Hideo
Ono Kozo
Satake Koji
Takeshima Fumio
Arent & Fox LLP
Chang Ching
Honda Motor Co. Ltd.
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