Page 282 - Gear Technology Solutions

Figure 8: Impulse caused by motion error (angular transmission Variation)

In the case of low inertia on the output side of the gearset, vibrations with the
tooth mesh frequency will be experienced. These vibrations can result in flank
separation during the slow down period (along drop of the Dw velocity graph)
because the deceleration Da of the speed increaser is elevated by the factor of
the ratio Da = R • (-2C). Flank separation will not only cause a hammering
sound, but it will also result in a lubrication film interruption at the transfer point
when the impulse occurs. Reducing the motion error in the design calculation
will reduce the flank separation effect and applying the dynamic load factor DLF
will account for the higher average contact forces.

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