目前我国市场上的大多数二冲程摩托车都采用分离润滑结构,由机油泵吸取机油箱内的润滑油,定点输送至化油器进油接头处,待其充分混合后,被压送至曲轴箱内的曲柄室和汽缸、活塞等关键部位,进行油雾润滑。为保证机油泵在静止状态下不渗漏,在机油泵的出油口处设计加装了止回阀结构。随着使用时间的延长和机油泵止回阀内的弹簧弹力的不断下降,再加上机油内的异物逐渐增多,止回阀的功能会逐渐减退,在发动机不工作时,仍有机油由机油箱通过其止回阀慢慢渗漏到化油器的浮子室内。在发动机的设计中,机油泵止回阀的微量渗漏是工艺所允许 At present, most two-stroke motorcycles on the market in China adopt the separation and lubrication structure, the lubricating oil in the fuel tank is sucked by the oil pump and sent to the oil inlet of the carburetor by fixed point. After being sufficiently mixed, Crankcase crankcase and cylinder, piston and other key parts, for oil mist lubrication. In order to ensure that the oil pump does not leak under static state, a check valve structure is designed at the oil outlet of the oil pump. As the use of time and the oil pump check valve within the spring elastic decline, coupled with the foreign body of the oil gradually increased, the function of the check valve will gradually diminish in the engine does not work, there is still oil from the machine The tank slowly leaks into the carburetor’s float chamber through its check valve. In the design of the engine, the micro-leakage of the oil pump check valve is allowed by the process