The design of gears – especially planetary gears – can just be carried out by the consideration of influences of
the whole drive train and the analysis of all relevant machine elements. In this case the gear is more than the
sum of its machine elements. Relevant interactions need to be considered under real conditions. The
standardized calculations are decisive for the safe dimensioning of the machine elements with the
consideration of realistic load assumptions. But they need to be completed by extended analysis of load
distribution, flank pressure, root stress, transmission error and contact temperature.
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