A rotating shaft which counters unbalance in a rotating machine to cancel out some vibrations produced by the engine.
A shaft designed so that, as it rotates, its vibrations reduce the vibration produced by an engine. They are not essential parts but are fast becoming important for engine refinement.
A shaft designed so that, as it turns, it counter rotates the rotational direction of the engine crankshaft in a manner that reduces or cancels out some of the vibration produced by the engine.
A shaft in a modern engine that is designed so that, as it rotates, it reduces or cancels out vibrations. Balance shafts are becoming increasingly popular in the design of new engines.
a heavy shaft that runs through the engine parallel to the Crankshaft
In piston engine engineering, a balance shaft is an eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced (for example, most four-cylinder engines). They were first invented by British engineer Frederick Lanchester in 1904.