Abstract: The mechanism of gear scuffing and its analytical method presented earlier is further developed. In respect that the typicality of the gear meshing process, a unsteady temperature distribution of the gear bulk is solved by using a finite element method. Further more, a calculating method for gear scuffing is built, and the experiment of gear scuffing is introduced. It is shown that the calculated scuffing load is in accord with the test results. It is also shown that, under the conditions of the same oil-material combination, the tooth surface temperature when scuffing occurs is not a constant, but has a great relation to the rotational speed, the torque, the operating mode and the quantity of oil. After initial scuffing, the raising rate of tooth surface temperature, the severity of wear index, the dimension of the wear particle are raised obviously, but the gear can continue to work. So to monitor the initial scuffing is very important to prevent the gear transmission from more severe scuffing and seizure.

Key words: Calculating method, Gear, Scuffing