Development of plastic gears for power transmission. Various methods of lengthening the life of plastic gears and their effect.

The life of plastic gears is shortened when they are used at a high temperature because they become less strong and vary in the way they mesh each other, causing them to be worn away at their root in an abnormal way. It is necessary for lengthening the life of plastic gears to take care not to generate heat in them and to keep them from rising in temperature by radiating heat quickly. The present report treats of various methods designed for lengthening the life of plastic gears having form and dimensions adapted to given operating conditions and inquiries made about whether the use of these methods can lengthening the life of plastic gears to a greater extent than anticipated at the time of designing.