Page 227 - Gear Technology Solutions

16.6 Noise Reduction by Topography Scattering

The industrial application of topography scattering according to [1, 2, 3 and 4]
appears to be the first successful methodology in reducing noise and tonality
by changing gear features which affect the flank surface shape and location.

Figure 7: Topography scattering, shown on 6 teeth of an 11-tooth pinion

In Figure 7, a realistic example of the surface deviation amount of an eleven-tooth
pinion is shown on six teeth. The deviations are first designed, tooth by tooth. The
left black and white graphics show the designed deviations of one flank each. The
maximal deviation amount is indicated on the cosine shaped graphs. The machine
settings of all 11 flanks (slots) have been transferred to a bevel gear grinding ma-
chine and one pinion was ground. The results of a coordinate measurement of
each respective flank are shown in the colored deviation plots next to the designed
deviations. The maximal corner deviations of each tooth are in the vicinity of +/-10

212