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随着活塞行程S与气缸直径D之比的变化,发动机内部损失也在变化,这些损失对它的经济性也有影响.因此,在确定S/D最佳值时,必须了解这些损失变化的程度. 本文中研究S/D变化对下述的影响:具有压力的相对位移表面间的纯机械摩擦损失;与气缸换气过程有关的泵气损失;活塞移动时曲轴箱中气体流动和另件在气体介质中转动时气体动力阻力引起的风动损失;驱动辅助机构及组件的损失.
As the ratio of piston travel S to cylinder diameter D changes, the internal losses in the engine also vary, and these losses also have an impact on their economy. Therefore, in determining the optimum S / D value, it is necessary to know the extent of these changes in losses In this paper, the effects of S / D variations on purely mechanical frictional losses between surfaces with pressure relative displacement, pumping losses associated with cylinder ventilation, gas flow through the crankcase while the piston is moving, Vibration loss caused by gas dynamic resistance during gas medium rotation; Loss of driving auxiliary mechanism and components.