a mechanism controlling the valves of a steam engine, consisting of a slotted link terminating in a pair of eccentrics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use link motion in a sentence
One form of valve-gear is the link motion invented by Stephenson.
Stephenson's link-motion valve-gear is used on most locomotives.
link motion for locomotives—George Stephenson, England, 1833.
I was much like the rest of the boys until I commenced to try to get up a substitute for the link motion.Stories of the Railroad | John A. Hill
The head stock of a lathe—the back gear in particular—is about as hard a thing to improve as the link motion of a locomotive.