It all depends on the type of gear, Bevel, Worm, Helical, Spur,...
However in brand new gears wou are expected to get a contact (usually at center, however again, in certain application we deliberately keep off center in one of the sides - depending on the expected full load condition and its direction) - of approx 30-60% only.
Lesser contact is bound to create excess contact pressure on full load, Higher contact has a disadvantage in terms of wedge formation for lubrication.
Actual contact pattern will depend on the manufacturer(profile of gear, accuracy class), the loading, loading pattern, type of gear and myriad other parameters (best answer may come from the gear manufacturer- about his recommended pattern).
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contact ratio
Re: contact ratio
