Lay shaft

n.1.(Mach.) A secondary shaft, as in a sliding change gear for an automobile; a cam shaft operated by a two-to-one gear in an internal-combustion engine. It is generally a shaft moving more or less independently of the other parts of a machine, as, in some marine engines, a shaft, driven by a small auxiliary engine, for independently operating the valves of the main engine to insure uniform motion.
References in periodicals archive ?
Scania said it improved its automated gear-changing system, the Opticruise, adopting the lay shaft brake that enables faster and smoother gear change.
The red shaft and it's joined gear wheel (lay shaft) are one part, which is affected by the green shaft and spins with it.
A lighter, less expensive, and more easily maintained system uses ordinary 1,750-rpm induction motors coupled with a lay shaft and bevel gears.
Lay shafts on floor and weld the piece that looks like Fig.