Definitions for "BALANCE SHAFT"
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.