A mechanical component that slides back and forth, connecting a piston rod to a connecting rod in engines, or a structural element spanning across perpendicular support posts.
From 'cross' (spanning across) and 'head' (the main or central part). This mechanical term emerged in the 19th century with the development of internal combustion engines and complex machinery.
In steam engines and large diesel engines, the crosshead is a brilliant mechanical solution—it converts the straight up-and-down motion of the piston into the rotating motion needed to turn the wheels, and it can handle enormous forces!
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