Press camshaft numerary how many, can divide camshaft of buy of the top that it is sheet (SOHC) and camshaft of double top buy (DOHC) two kinds. Single camshaft carrying buy on the head has a camshaft only namely, double camshaft carrying buy on the head has two namely, this is too straight white explanation. Single camshaft carrying buy on the head uses rod of root of a protruding on air cylinder lid, direct drive is entered, exhaust valve, it has a structure simple, apply to high speed engine. The side buy camshaft that uses commonly before, namely camshaft is in air cylinder flank, by when gear is direct drive. It is the reciprocate of spiracle for the rotational commutation camshaft, must use spiracle tappet to transfer power. Such, the spare parts of reciprocate is more, inertial quality is great, go against motion of engine high speed. And, long and thin tappet has certain flexibility, cause vibration easily, quicken a spare parts to wear away, make spiracle loses control even. Axle of biconvex carrying buy on the head is in the crock lid jacket has two camshaft, one is used at drive inlet valve, another is used at drive exhaust valve. Use double camshaft carrying buy on the head the design demand of bedspring of amiable to camshaft door is not high, special the hemisphere form firebox that applies to configuration of spiracle V form, also facilitate with 4 valve compressed air distribution mechanism cooperates to use. CNC MillingCNC Machining