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Re: A wheel by any other name
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Posted by Janicholson on October 16, 2006 at 12:47:42 from (199.17.6.122):
In Reply to: A wheel by any other name posted by jc on October 16, 2006 at 12:28:14:
yes and no... It is a flywheel in miniature, as all rotating mass is a flywheel of sorts.
The Harmonic ballancer is a vibration dampener. For the same reason that touching a tuning fork with your finger stops its tone, a harmonic ballancer will deaden the tortional vibrations of a crankshaft. There are two primary types, both work in a similar way. A outer rim of steel or cast iron is bonded (vulcanized) to a synthetic rubber sleeve in its I.D. This is inturn bonded on its I.D. to a hub that is pressed or fastened to the crank snout. A special durometer (flexibility measurment) index is used for each engine/application that a company produces. As an engine runs, the crankshaft sets up vibrations that are along its length (like winding up a torsion bar front spring. as this windup relaxes and goes winding the other way, the stresses it creats can snap a crank into pieces. The dampner is designed to absorb these forces so that the shaft runs without the destructive winding. Some of the dampners also include an off set weight that is a part of the counterbalance of the crankshaft. These must be set indexed to the crank to avoid massive vibration. Most dampners fail by having the rubberish material become detached from the hub, or mini flywheel. Some of teh newer wheels have a fluidic dampner inside and are more complex. There you have it. JimN
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