Mechanical equipment has higher and higher requirements for the stability, vibration performance and accuracy of gear transmission, but various errors and elastic deformation of gear transmission system will lead to abnormal meshing of gear teeth, dynamic problems of gear transmission and vibration and noise. The methods to improve the stability of gear transmission and reduce system vibration and noise mainly include:
① Reducing the elastic deformation of the support shaft can reduce the dynamic load coefficient of gear transmission to a certain extent;
② Changing the structure of gear body can reduce the meshing stiffness and dynamic contact load of gear transmission, but the strength of gear teeth will be reduced;
③ At present, this method is a common method to improve the transmission performance of gears, and is widely used in practice.
Therefore, the dynamic simulation analysis of gear by software is an effective means to analyze the vibration performance and dynamic behavior of gear transmission.
Zou Yi [the output speed and transmission ratio of the fourth gear Lavina planetary gear transmission system are simulated and analyzed by romax software, which provides a new method for the analysis of the planetary gear transmission system. Zhao Zhiguo completed the three-dimensional model of the drive axle transmission system in romax software, and obtained the bending stress and torsional stress of the shaft by analyzing and checking the static strength of the gear shaft It lays the foundation for the dynamic problem of transmission. Meng Suimin and others established the solid model of the drive box system by using romax software, set the load spectrum and power flow, and analyzed the strain and stress of the middle shaft of the drive box under different load conditions. These results are a theoretical reference for the design and optimization of the drive box.
Fang Zhenjiang et al. Established the gearbox model in romax, analyzed and optimized it, and designed a new type of gearbox. Gears, bearings, shafts and splines can be modeled directly in the software. Complex parts such as planetary carrier and box body must use the finite element software to establish the finite element model and generate the stiffness matrix, and then import it into romax software to jointly form the rigid flexible coupling model of the gearbox. At the same time, based on romax, it has the functions of gear transmission geometric parameter optimization and micro analysis. Using the geometric modification module of the software, the tooth top linear modification and tooth direction drum modification are carried out at the same time, and the tooth transmission error and contact load before and after modification are analyzed. Guan Hao optimized the tooth profile modification parameters of the filter reducer by using romax, analyzed the tooth transmission error and dynamic response after modification by using the system dynamics module, and verified that the working characteristics of the gear transmission after modification are better than before. Tang Jinyuan and others used the excellent load distribution analysis function of romax software to take the gear transmission of a reducer as the object, combined with the original design parameters, analyze the load distribution of gear transmission and the transmission error of meshing transmission, determine whether there is meshing in and meshing out impact in gear transmission, and then obtain new tooth surface parameters to improve the dynamic problems of gear transmission.
From the current situation of dynamic simulation analysis of gear transmission, it can be seen that there are many dynamic simulation analysis of cylindrical gear transmission, and there is less analysis of spur bevel gear; There are more single teeth or partial teeth and less whole teeth; There are many researches on gear mesh generation by using two-dimensional plane element, but there are few researches on gear mesh generation by using three-dimensional solid element; More research on Statics and less on dynamics; There are more researches through idealized model and less researches through actual transmission model; Considering the instantaneous stress and strain of meshing, there are few studies on other dynamic performance parameters.
On the premise of considering the existence of machining, tooth error and tooth deformation, the dynamic analysis of spur bevel gear transmission system is carried out by using romax software, and the transmission error, tooth contact load and dynamic response before and after modification can be obtained, so as to summarize the influence of tooth modification on the dynamic performance of gear transmission in the actual state.