Abstract
The conventional method (three-moment balance method) used for calculating the power transmission efficiency of gear drives is well established. However, the authors have found an error in the conventional method. They present three universal methods which give the exact equations for the efficiency. These methods utilize the tangential forces between gear teeth, which are determined by considering the torque efficiency and the balance of the forces and moments. In most cases, the conventional method gives an approximate value which is a little higher than that obtained by the corresponding exact equation. The differential between the approximate and exact values becomes appreciably greater when differential motion is introduced to the gear drive.
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