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提高曲轴转速是提高柴油机气缸功率的途径之一。但是曲轴转速一高,会引起活塞平均速度相应提高;而活塞平均速度提高的后果,是气缸——活塞组零件可靠性下降,寿命缩短,机械功率下降等等。当然,可以限制或维持活塞平均速度不变而使曲轴转速提高,这就是缩短活塞行程,也就是说,降低活塞行程S与气缸直径D之比。此即所谓短行程发动机(与一般的S/D>1的
Improving crankshaft speed is one of the ways to improve the power of diesel cylinder. However, a high crankshaft speed will cause a corresponding increase in the average piston speed; and the consequence of an increase in the average piston speed is a decrease in cylinder-piston assembly reliability, shortened life span, reduced mechanical power, and the like. Of course, it is possible to limit or maintain the constant average piston speed to increase the crankshaft speed, which is to shorten the piston stroke, that is to say, to reduce the piston stroke S and cylinder diameter D ratio. This is the so-called short-stroke engine (with a general S / D> 1