What is a vibration damper used for?

• A. Absorb torsional vibrations
• B. Convert rotary to linear motion
• C. Increase friction
• D. Balance cam timing

Answer: (A)

Torsional vibration control is being tested. A vibration damper is used to absorb torsional vibrations in the crankshaft, smoothing the torque transmitted through the engine and reducing wear, noise, and fatigue of the rotating assembly. It does this with a heavy inertia ring connected to the crank via a rubber or viscous element, which dissipates vibrational energy as heat. It does not convert rotary motion to linear motion, nor is it intended to increase friction or balance cam timing. Absorbing torsional vibrations is the correct description.