二冲程汽油机具有结构简单、体积小、重量轻、升功率较大等优点,因此,常用作微型汽车和摩托车的动力。由于二冲程汽油机结构上的特定条件,通常都采用混合润滑,即在燃油中掺入一定量的机油,机油量约占燃油量的5%。这个比例是以保证曲柄连杆机构在额定转速下全负荷运行时能有可靠的润滑而确定的。实际上,对于车用发动机来说,使用最高转速和最大功率的时间,只占总运行时间的15%左右。发动机在中速中等负荷下运转时,所需要的机油量仅为燃油的1～2%。所以,采用混合润滑的二冲程汽油机,大部分时间是在过量润滑 Two-stroke gasoline engine has the advantages of simple structure, small size, light weight and large power lift, therefore, it is often used as a power for mini cars and motorcycles. Because of the specific conditions of a two-stroke gasoline engine, hybrid lubrication is usually used. That is, a certain amount of oil is blended into the fuel, and the amount of oil accounts for about 5% of the fuel. This ratio is determined by ensuring reliable lubrication of the crankshaft linkage at full load at rated speed. In fact, for the car engine, the use of the maximum speed and maximum power of the time, only about 15% of total operating time. When the engine is running at medium speed and medium load, the required amount of oil is only 1 to 2% of the fuel. Therefore, the use of hybrid lubrication two-stroke gasoline engine, most of the time in the excessive lubrication