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发动机上有多个具有各自功用的小孔,这些小孔在保养时往往被人们忽视,因而也常出现因这些孔堵塞而引起的故障。曲轴箱的通气孔除二冲程发动机外,四冲程发动机曲轴箱均要求与大气相通。通气孔常设在机油加注口处或气门室罩处,并设有防止灰尘进入曲轴箱的滤网。空气经此孔进入曲轴箱,曲轴箱内的废气由此孔排出,具有“呼吸”作用。其功能是使曲轴
The engine has a number of holes with their own functions, these holes are often overlooked in the maintenance, which are often blocked due to these holes caused by the failure. Crankcase vent in addition to two-stroke engine, four-stroke engine crankcase are required to communicate with the atmosphere. Vents are often located at the oil filler opening or in the valve housing and have screens to prevent dust from entering the crankcase. The air enters the crankcase through this hole, and the exhaust gas inside the crankcase is discharged through this hole, which has the function of “breathing”. Its function is to make the crankshaft