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本文介绍气缸盖上装有气门而气缸上没有气口的二冲程汽油机的扫气和动力性能的研究。从前试验时用模拟试验装置对扫气性能进行了试验分析。分析表明,装导流屏的扫气门比最佳的扩散扫气更能改善气缸内的扫气流,从而提高扫气效率。现用一台实机进行试验研究。原机是一台摩托车用双凸轮、四气门、250mL四冲程单缸发动机。通过改变凸轮轴,将其改装成二冲程发动机,使其转速比原机提高一倍,气门正时由凸轮和链轮的连接销调整。在每条扫气道中靠近气门座处安装导流凸块,用以替代带导流屏的扫气门。为了改善扫气,使用一台可反转电动机驱动的蜗壳鼓风机并用化油器供油。试验结果表明,其扫气性能几乎等于实机的最佳扩散扫气。在同一转速下进行比较,二冲程试验机的功率大于四冲程原机。
In this paper, the scavenging and dynamic performance of a two-stroke gasoline engine equipped with a valve on the cylinder head and no air port on the cylinder is introduced. In the past, experiments were conducted on the scavenging performance using a simulated test apparatus. The analysis shows that the scavenging valve fitted with the flow screen can improve the scavenging airflow in the cylinder more than the best diffusion scavenging gas, thereby improving the scavenging efficiency. Are using a real machine for experimental research. The original machine is a motorcycle with dual-cam, four-valve, 250mL four-stroke single-cylinder engine. By changing the camshaft, it will be converted into a two-stroke engine to double the speed of the original machine, and the valve timing is adjusted by the connecting pin of the cam and sprocket. Install diversion bumps near each valve seat in each scavenging channel to replace the scavenge gate with a guide plate. To improve scavenging, a reversing motor-driven volute blower is used and the carburetor supplies oil. Test results show that the scavenging performance is almost equal to the best real machine proliferation scavenging. In the same speed for comparison, two-stroke test machine power is greater than the original four-stroke machine.