PURPOSE: To manufacture a mold precisely setting a cam lobe by forming a recessed part or a projecting part or a part cut off to the projecting part at the side surface of the cam lobe.
CONSTITUTION: The cam lobe 6 is manufactured with a sintered alloy so as to arrange the recessed part 10 or the projecting part 11 at the side surface. The cam lobe 6 is assembled with an upper mold or a lower mold and molding sand is filled up and a pattern is removed. The recessed part 10 or the projecting part 11 in the cam lobe 6 is fixed in the molding sand to obstruct the movement of the cam lobe 6 and the mold assembled with the cam lobe 6 is obtd. Molten metal is poured in the mold to obtain a cam shaft with the cam lobe 6. A part of the cam piece is made of the sintered alloy, and the whole wt. can be reduced. As the shaft bending as the cam shaft or the shifting of phase angle of the cam are little, the excess thickness for grinding on the cam is made to be little, and the productivity is improved.
IIZUKA HARUO
SAKA TSUTOMU
FUJIWARA AKIRA
YAMADA NORIYUKI
HONDA MOTOR CO LTD