Plastic gearsoften breakat thetip ofthetooth. To theknowledge oftheauthors, there is no satisfactory explanationof
that breakage mode yet. An hypothesis put forward in this paper to explain the tooth breakage at the tip is the
interferenceon theback ofthe tooth. It is reportedhere how interferenceon theback of the tooth has been verified
experimentally. Then it is explained how CAD software and plastic gear calculating software have been used to
simulate the kinematics of a gearpairto predict and to localizethe interference on the back of the tooth. The results
obtained werethen usedwith a finite elementanalysis to show thatthemaximumtensile bending stress shifts from the
root ofthe tooth to a point above the pitch circle when there is interference on the back ofthe tooth. The conclusion is
thatthehypothesis oftheback interferencecanrealisticallyexplaintheparticnlarfailure ofaplastic geartoothatthe lip,
but it remains to refine the calculations to find moreprecisely the values of the loads thatare applied on the tooth.

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