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harmonic balancer
A harmonic balancer (also called crank pulley damper, crankshaft damper, torsional damper, or vibration damper) is a device connected to the crankshaft of an engine to reduce torsional vibration and serves as a pulley for drive belts.〔("Car Talk", March 2000 ), retrieved on 2009-12-10.〕〔(Definition of Harmonic balancer", Online Dictionary ), retrieved on 2009-12-10.〕
==Vibration==
Every time the cylinders fire, torque is imparted to the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torques imparted by the cylinders are in sync with the vibrations in the crankshaft, which results in a phenomenon called resonance. This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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