Piston rod
Link connecting the piston to the crank in a reciprocating piston mechanism / From Wikipedia, the free encyclopedia
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In a piston engine, a piston rod joins a piston to the crosshead and thus to the connecting rod that drives the crankshaft or (for steam locomotives) the driving wheels.
Internal combustion engines, and in particular all current automobile engines, do not generally have piston rods. Instead they use trunk pistons, where the piston and crosshead are combined and so do not need a rod between them. The term piston rod has been used as a synonym for 'connecting rod' in the context of these engines.[citation needed]
Engines with crossheads have piston rods. These include most steam locomotives and some large marine diesel engines.