| 摘要 |
PURPOSE:To produce a cam shaft which has no clatter in cam parts and journal parts in the stage of producing said cam shaft by forming the cam parts and journal parts into an annular shape, forming specifically shaped grooves to the inside surface and matching the axial lines thereof then setting said parts into a casting mold and casting a shaft part. CONSTITUTION:The parts to be formed into the cam parts of the cam shaft and the parts 12 to be formed into the journal parts thereof are made of a sintered alloy having excellent resistance to wear. The parts 11 and the parts 12 are made into the ring shape and are preliminarily formed internally with the grooves 11C, 12c provided respectively with recesses 11a, 12a and projecting parts 11d, 12d as the holes in which the shaft part A pass. These parts are set into the casting mold after the axial lines thereof are matched and thereafter the molten metal for forming the shaft part A is cast into the mold, by which the cam shaft A having the cam parts B and journal parts C is produced. The costly sintered alloy is used only for the cam parts and journal parts and the cam shaft having no clatter from the shaft part is produced at a low cost. |
