在十字头型发动机中，活塞连接在一根垂直的活塞杆上，活塞杆的下端又连接在一个叫做十字头的滑动构件上，十字头在导轨中上下滑动。
In crosshead-type engines, the piston fastens to a vertical piston rod whose lower end is attached to a sliding member called a crosshead, which slides up an down in guides.
在该三根导杆的上端固定连接有所述顶横梁；在该三根导杆的下端则固定连接有所述活塞；
The three guide rods are set parallel mutually between the top cross beam and the lower piston and distributed in an equilateral triangle.
复合式弯辊液压缸缸体的上、下端分别装有上压板和下压板组成油缸，里面装有活塞杆和连接杆。
Upper and lower ends of the hydro-cylinder identity are installed upper pressure board and down pressure board, which has piston rod and connecting stick.
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