第三章 配气机构(国外英文资料).docVIP

第三章 配气机构(国外英文资料) At present, the four-stroke engine is equipped with air valve. Its function is in accordance with the requirements of the engine working order and working cycle, open and close regularly each cylinder inlet and exhaust valve, make the new air into the cylinder, exhaust from the cylinders. The amount of new gas in the cylinder or the amount of air in the gas cylinder has a great effect on the performance of the engine. The more air, the more efficient the engine and the greater the torque. Therefore, the gas distribution mechanism should first ensure that the intake is sufficient and the air intake is as much as possible. At the same time, the exhaust gas should be eliminated, because the more waste gas left in the cylinder, the less it will be. Section 1 the function and composition of the gas organ Valve type gas distribution mechanism consists of two parts, valve group and valve transmission group, each group of parts with the valve position, the position of the camshaft and valve drive form and so on. The modern car engine adopts the overhead valve, namely, the entrance and exhaust valve are placed inside the cylinder cover and hung upside down on the top of the cylinder. The position of the camshaft has a lower set, middle and upper set. One, the shaft of the camshaft set up the gas distribution mechanism The CAM shaft is placed in the crankcase with the air-distribution mechanism of the camshaft. The parts of the valve include valve, valve seat, valve, valve spring, valve spring and air lock. The parts of the valve drive unit include the CAM shaft, the prop shaft, the shaft, the rocker arm, the rocker shaft, the rocker arm shaft and the valve clearance adjustment screw, etc. The lower camshaft is driven by the crankshaft timing gear. When the engine is working, the crankshaft rotates the camshaft through the timing gear. When the lifting part of the CAM is mounted, the screw is adjusted by the push rod and the valve clearance to push the rocker