link motion

plural link motions

1. datedengineeringA valve gear consisting of two eccentrics with their rods, giving motion to a slide valve by an adjustable connecting bar (the link) in such a way that the motion of the engine can be reversed, or the cutoff varied.

   1 more example

   The eccentric rods and eccentric straps are then coupled up. The eccentric sheaves have already been keyed on at the proper angle to the crank axle in the wheel shop, and nothing remains to be done but to place the straps and rods in position, and couple the latter to the links of the link motion, which are put up at the same time and connected to the valve spindles.

   1921, Ernest Leopold Ahrons, Steam Locomotive Construction and Maintenance, Chapter VIII