The precision camshaft is a key component in the gas distribution system of the automobile engine. Its main function is to control the opening and closing time and opening amount of the intake and exhaust valves of each cylinder, so as to meet certain working order and opening change rules. When the car engine is working, the relative angular position of the cam and the intake (or exhaust) cam on the camshaft and its contour change should be accurately ensured to open the valve.
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