In trunk-piston engines, a horizontal pin within the piston is encircled by the upper end of the connecting rod. This by far the most common construction.
在筒状活塞式的发动机中，活塞与连杆上端通过一个水平销子连接。这是最常见的一种结构。
2
The piston may be connected to the upper end of the connecting rod either directly (trunkpiston type), or indirectly (crosshead type).
活塞与连杆上端的连接，既可以是直接连接(筒状活塞式)，也可以是间接连接(十字头式)。
3
The compressor is a trunkpiston style compressor. It is derived from a proven oil field compressor frame that has been modified for the demands of high-pressure compression.