新设计的发动机活塞顶是通过由曲轴箱导入活塞空腔的气体进行冷却的。发动机活塞常有顶端受载高、易过热的缺点,而且受热很不均匀。这就使得活塞顶一端易变形和失圆。为了抵消这种变形,有时也把活塞加工成非圆的。 在新设计当中,冷却介质借助安装在活塞裙内的导流装置由曲轴腔向上 The newly designed engine piston top is cooled by the gas introduced into the piston cavity by the crankcase. Often the top of the engine piston carrying high, easy to overheating shortcomings, but also very uneven heating. This makes the top of the piston easily deformable and out of round. In order to counteract this deformation, the piston is sometimes machined to be non-circular. In the new design, the cooling medium flows upwardly from the crank chamber by means of a flow guide installed in the piston skirt