The thermal behavior of the high-speed and heavy-duty gear system has a great influence on its bearing capacity. In the thermal design and thermal check, the thermal behavior must be considered. The thermal behavior of gear system includes temperature field distribution, thermal deformation, thermoelastic contact behavior, thermal adhesive bearing capacity and so on. The tooth profile modification can reduce the dynamic load, vibration and noise. The thermal behavior of the tooth should be fully considered in the tooth profile modification design. The main conclusions are as follows: 1
Through the sentinel stiffness distribution and load balance equation, the tooth profile modification mechanism ofpair is studied, and the transmission error and load distribution of gear system under different modification parameters are revealed from statics and dynamics. Static analysis shows that both long and short modification can improve the load distribution of gear pair, but according to the distribution of transmission error, the effect of long modification is better than short modification. When is, the transmission error fluctuation is the smallest and the gear transmission is the most stable for the ideal shape modification. When the modification amount is greater than the optimal modification amount, the sentinel area of double teeth becomes smaller, and the transmission error curve is convex; when the modification amount is less than the optimal modification amount, the minimum load becomes larger, which causes sudden change of load, concave transmission error curve and sudden change. The results of dynamic analysis further show that when the amount of modification is less than the optimal amount of modification, the dynamic load is smaller, and when the amount of modification is greater than the optimal amount of modification, the dynamic load increases rapidly. When the shape modification index is less than, the dynamic load is smaller, but when the shape modification index is greater than, for the shape modification less than the optimal shape modification amount, the load has little influence, and for the shape modification amount greater than the optimal shape modification amount, the dynamic load is larger. Therefore, the selection principle of profile modification quantity is to fully consider the elastic deformation, thermal deformation and pitch error. At the same time, the profile modification quantity should be less than or equal to the optimal thermoelastic combination modification quantity, and the selection principle of profile modification index is less than or equal to.
For the high-speed and heavy-duty gear system, the ideal modification curve is established through the thermal deformation calculation and thermo elastic coupling analysis. The design of tooth profile modification curve needs to consider the thermal deformation. The optimal modification amount is the critical deformation of single tooth whistled joint area of thermo elastic balance analysis, and the modification length includes the double tooth area and single tooth area at the tooth top.
The profile modification can not only improve the scuffing capacity, but also reduce the vibration and noise. The optimal profile modification reduces the temperature of the body, the maximum flash temperature, the contact temperature and the dynamic load coefficient.