Rolf,
Load per planet is the load on one tooth - however I don't think all the
load is on the one tooth, as discussions with other engineers who have done
computer stress analysis suggest that a load on such dimensions would cause
the tooth to fail on every occasion. So I assume from this information that
the tooth with the most load is being supported by the following tooth to a
degree. To what degree is unknown to me, but my gut feelings is that it
could be as high as the third of the load?
George (down under)

George,
Yes, you are right of course. The time duration when two teeth of one
gear are in contact depends on the number of teeth of pinion and gear.
Since the pinion, (here the planet can be considered as one) usually has
very few teeth, the times where two teeth engage is short.

At the beginning and at the end of tooth engagement there are two teeth
in contact, and there is a middle section where only one tooth pair is
engaging. However at this condition the bending load is less, so that
the calculation as it was, is quite safe.

Rolf


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