Gear transmission system is the core mechanism of mechanical equipment, which determines the performance of the whole machine. But for high-speed and heavy-duty gear system, its thermal behavior has become an important factor limiting its development. The thermal deformation of the gear system due to the existence of temperature field will increase the noise and vibration of the transmission system. The impact of the thermal bonding damage caused by the transient contact temperature on the normal production is more and more significant, which makes the thermal design and thermal check of the gear system necessary.

Gear transmission system is the core mechanism of mechanical equipment, which determines the performance of the whole machine. But for high-speed and heavy-duty gear system, its thermal behavior has become an important factor limiting its development. The thermal deformation of the gear system due to the existence of temperature field will increase the noise and vibration of the transmission system. The impact of the thermal bonding damage caused by the transient contact temperature on the normal production is more and more significant, which makes the thermal design and thermal check of the gear system necessary.

The research shows that simply improving the machining and installation accuracy of gear teeth can not effectively solve the vibration and noise, but will increase the cost of machining and manufacturing, the gain is not worth the loss, so necessary tooth profile modification must be carried out. For high-speed and heavy-duty gears, the influence of thermal deformation must be taken into account in profile modification, so as to reduce the eccentric load, impact and noise as much as possible, so as to improve the scuffing bearing capacity.

In view of the above reasons, ZHY gear conducts a comprehensive study on the thermal behavior of the gear system. Starting from the thermal design and thermal check of the gear transmission system, a more accurate prediction method of the temperature field of the gear system is put forward, the thermal deformation of the gear teeth is calculated, and the thermoelastic balancing problem of the gear system is studied, so as to determine the ideal profile modification curve under the thermoelastic balancing state. The flash temperature, contact temperature distribution and oil film thickness of the gear system are studied by the analytical method and thermoelastic flow method Distribution and so on, to obtain the scuffing bearing capacity of the gear pair.

The thermal design of gear system includes not only the static temperature field calculation, tooth profile modification design, contact strength and bending strength design, but also the dynamic stress design, dynamic load, dynamic flash temperature, dynamic bonding strength and other contents based on dynamic load. Based on the theory of system dynamics, this paper studies the dynamic load, dynamic characteristics and dynamic load distribution of the gear system under the tooth profile modification, and carries out transient thermoelastohydrodynamic analysis according to the dynamic load distribution, which provides the basis for the dynamic thermal design of the gear system.

The research on the thermal behavior of the gear system has important engineering value: the prediction of temperature field provides the basis for the thermal design and thermal check of the system, and provides the reference for the tooth profile modification design; the tooth profile modification design has important significance for improving the transmission stability, vibration reduction and noise reduction of the gear system; the design and check of the thermal gluing bearing capacity is to improve the lubrication performance and noise reduction of the high-speed and heavy-duty gear system The key technology of prolonging service life.