| 摘要 |
A lightweigth aluminum camshaft and manufacturing method thereof is provided. The method of manufacturing a lightweigth aluminum camshaft having a cam portion having cams the numver of which is same as that of valves in order to open and close suction and exhaust valves in an engine, and a shaft portion (3) on which the cam portion is mounted, includes the steps of separately fabricating the cam portion with cam pieces (2a), inserting the separately fabricated cam pieces as inserts into a mold, and injectiong molten aluminum alloy into the mold (4) through an aluminum casting method, to thereby from the cam pieces (2a) and a shaft portion (3) called a journal portion in an integral from. Simultaneously, a lightweight aluminum camshaft manufactured by the lightweight aluminum camshaft manufacturing method is provided. Here, a binder portion whose diameter is larger than that of the shaft portion and having binders each formed in the form of a reinforced rib coming into contact with the side surface of each cam piece, is provided in the joining portion of the cam pieces and the shaft portion, in order to enhance a joining intensity. Thus, the lightweight aluminum camshaft becomes lighter, has an excellent wear-resistant property, possesses a high durability and strength, and is inexpensive. |
