活塞是一个中空的圆柱体形状部件，其在发动机气缸里做上下往复运动。
The piston is a cylindrical shaped hollow part that moves up and down inside the engine cylinder.
这一机构有一系列部件组成，如曲柄箱、气缸体、活塞、连杆、曲轴等。
The mechanism consists of several parts like crankcase, cylinder block, pistons, connecting rod, crankshaft, etc.
对其侧板、立柱、活塞桁架等主要部件的加工制作和煤气柜的安装步骤，安装要领及注意事项等方面的内容作了具体介绍。
The manufacture of its main parts and the steps of, the key points and matters needing attention in construction are introduced in detail.
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