Release Date：2017-09-20 17:50:40 sentiment：0 source：admin
1, considerations of structural dimension . Current angle of the valve is larger than that of before. If the camshaft is driven directly, then the transverse spacing between the 2 camshafts will increase, resulting in increaseed transverse dimension of the cylinder head; the use of rocker drive cleverly solve this problem, you canincrease the angle of the valve without increasing the size of the cylinder head.
2, considerations of eliminating the valve clearance . at present, the hydraulic tappet support is widely used in the support of the valve rocker, which can automatically eliminate the valve clearance. the adoption of this technology has solved the problem of eliminating the valve clearance with low cost.
3, reduce cam wear.the direct contact between the direct-drive cam peach and valve tappet is sliding friction, although the valve tappet is more flexible than the peach, it will inevitably cause wear in the outer contour of the peach, which may lead to a decrease in the accuracy of the air distribution. while the camshaft peach with rocker arm,and needle roller bearings with rocker arm are rolling friction, and the contour accuracy of cam peach can be maintained for a long time.
These are the main advantages of the rocker drived valve described by the Anhui Guanshun Camshaft Manufacturing Co. ltd. for family cars, the rocker drived valve is very affordable, so the rocker drived valve is widely used in the civil cars . the overhead camshaft reduces the inertia of the air distribution system, and of course, as for the weight of the mechanism,the lighter ,the better .