- An engine will normally vibrate because of the up-and-down motion of the pistons which turn a crankshaft in one direction. A balance shaft rotates (often in the opposite direction) so that its vibration cancels some of the vibration of the engine. Sometimes an engine will have two balance shafts turning in opposite directions located on either side of the crankshaft.
Dictionary of automotive terms. 2015.
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Balance shaft — 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… … Wikipedia
balance shaft — a special shaft with eccentrically mounted weights used in an internal combustion engine to reduce vibrations. * * * … Universalium
balance shaft — a special shaft with eccentrically mounted weights used in an internal combustion engine to reduce vibrations … Useful english dictionary
shaft — A long smooth surfaced bar of metal with a circular (round) cross section. See armature shaft arm shaft auxilliar drive shaft axle shaft balance shaft bevel drive shaft cardan shaft clutch shaft composite propeller shaft … Dictionary of automotive terms
balance —  The state in which weight is evenly distributed.  The action of applying weights or drilling holes in something to establish even weight distribution so that vibration is reduced. Also see balance shaft counter balance crankshaft counter… … Dictionary of automotive terms
shaft — [[t]ʃæft, ʃɑft[/t]] n. 1) a long pole forming the body of various weapons, as lances or arrows 2) something directed at someone or something in sharp attack: shafts of sarcasm[/ex] 3) a ray or beam 4) a long handle serving to balance or… … From formal English to slang
balance staff — noun : the pivoted arbor of a balance wheel * * * Horol. a pivoted axle or shaft on which the balance is mounted. [1880 85] … Useful english dictionary
balance staff — Horol. a pivoted axle or shaft on which the balance is mounted. [1880 85] * * * … Universalium
balance disc — A disc shaped device in a centrifugal pump which is attached to the pump shaft. The disc lifts when a force is applied to the underside of the disc allowing pressure to leak past until the axial forces are balanced … Dictionary of automotive terms
Engine balance — is the design, construction and tuning of an engine to run smoothly. Engine balance reduces vibration and other stresses, and may improve the performance, efficiency, cost of ownership and reliability of the engine, as well as reducing the stress … Wikipedia