PURPOSE: To prevent the occurrence of a quenching crack on a welded part by providing a low carbon member at ends on both sides of a part coming into contact with a shaft member of a cam member to weld the ends on both sides of the cam member and the shaft member.
CONSTITUTION: A cam member 1 and a journal member 2 are fitted on a shaft member 3, and low carbon members 4 are inserted in notches 1b, 2b, and then those parts are welded through a high energy beam 5 so that the low carbon members 4 may melt into the notches 4. In the case where a cam shaft is produced in this way, since carbon on the surfaces of the cam member 1 and of the journal member 2 diffuses toward the low carbon member 4 in the welded parts of the above parts, the quantity of carbon solid solution decreases in the welded parts. Thus, since the shrinkage of the welded parts of the cam member 1 and of the journal member 2 becomes less during a cooling process after welding, a quenching crack can be prevented.
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MIWA YOSHIHISA
MAEKAWA TOKIO
NOMURA SEIJI
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