A transverse-torsional dynamic model of a spur gear pair is employed to investigate the
influence of gear tooth indexing errors on the dynamic response. With measured long-period
quasi-static transmission error time traces as the primary excitation, the model predicts
frequency-domain dynamic mesh force and dynamic transmission error spectra. The dynamic
responses due to both deterministic and random tooth indexing errors are predicted.
Many years ago, when asked how the
five-meter gear was checked, the quality manager responded, “When they’re that big, they’re never bad!” That may have been the attitude and practice in the past, but it no longer serves the manufacturer nor the customer. Requirements have been evolving steadily, requiring gears to
perform better and last longer.
Helical gear teeth are affected by cratering wear — particularly in the regions of low oil film thicknesses,
high flank pressures and high sliding speeds. The greatest wear occurs on the pinion — in the area of
negative specific sliding. Here the tooth tip radius of the driven gear makes contact with the flank of the
driving gear with maximum sliding speed and pressure.
The question is quite broad, as there
are different methods for setting various types of gears and complexity of
gear assemblies, but all gears have a few things in common.