Gear drive system is widely used in various mechanical equipment because of its accurate transmission ratio, stable and reliable, long life, high efficiency, compact structure, etc., which directly determines the performance of the whole product. Therefore, gear drive technology reflects the modernization level of a national machinery industry to a certain extent.

With the development of machinery industry, gear drive tends to be dry, high-speed and heavy-load, accompanied by a large number of thermal behavior in high-speed and heavy-load gear drive. As the heat generated by friction on the tooth surface will greatly increase the temperature of the teeth, the thermal deformation will affect the tooth profile and tooth profile, resulting in non-involute linearity of the tooth profile, thus causing interference, vibration, noise and other problems.Instantaneous contact temperature generated by whistle joint will seriously affect the lubrication performance and gluing load-bearing capacity of gear system. Excessive contact temperature will lead to tooth surface lubrication failure and thus thermal gluing failure.As the failure mode is unpredictable, destructive and has the characteristics of short time, great harm and unpredictability, thermal behavior analysis is the most important part in the whole design and checking process of high-speed heavy-duty gear and the main content of thermal design and checking calculation.

Vibration and noise are inevitable products in high-speed and heavy-load gear drive. Time-varying meshing stiffness and damping exist in the gear system during meshing process, together with thermal deformation caused by temperature field, machining error and installation error during processing and assembly, etc., will further increase the vibration and noise of the transmission system.These vibrations and dynamic loads further affect the temperature field, contact stress, etc., which further increases the probability of thermal bonding failure.In addition, the vibration characteristics of gears are closely related to speed and natural frequency. Under the natural frequency of gear system or its frequency division, resonance or flapping will occur, which will sharply increase dynamic load and noise and further weaken its load-bearing capacity. Therefore, it is necessary to avoid resonance area and minimize dynamic load and stress during gear design.