In order to reduce {HEAD ~ the precession vibration} and {TAIL ~ torsional vibration} of the flexible coupling rotating at a high speed, it is important to minimize the backlash at the meshing portion of the gears 
In order to reduce { HEAD ~ the precession vibration } and { TAIL ~ torsional vibration } of the flexible coupling rotating at a high speed , it is important to minimize the backlash at the meshing portion of the gears
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