Transmission gear performance optimization based on optimal modification design

Gear is the most common power transmission mechanism used in various types of transmission. It has the advantages of strong power transmission ability, high transmission efficiency, accurate power transmission, stable operation performance and so on. Its meshing ability will have a certain impact on the performance of the transmission. With the improvement of transmission quality standards by domestic transmission manufacturers, more and more attention has been paid to the noise and reliability of meshing gears. Gear modification technology can ensure that the micro geometry of the gear teeth can be modified without changing the macro parameters of the gear teeth, so as to improve the meshing performance of the gear.

Therefore, the gear modification technology is the most effective measure to improve the meshing condition of gear teeth when developing the gear under the condition of high speed and heavy load. Xiong Hegen et al. Studied a two-stage helical cylindrical gear reducer, analyzed and introduced the gear modification technology by using romax designer simulation and genetic algorithm, and obtained the corresponding optimization design scheme. Yue GP et al. Used the method of multi-body dynamics to simulate the noise of the transmission system based on the optimization of macro parameters and micro geometry modification of gears. Bai Guoqing et al. Analyzed the internal fine high tooth gear of a transmission, and found that the tooth surface load distribution was uneven. After optimization, the transmission error was reduced. Tian Shaopeng and others studied all aspects of gear performance through Masta software, which shortened the product development time. Amol K et al. Reduced the transmission error and the excitation by optimizing the micro geometry of the gear. Wons et al. Predicted the vibration amplitude of the transmission, and proposed an example of modifying the micro geometry to improve the noise. In the past, the analysis of gear meshing is mainly based on the formula, which is cumbersome.

The gear mechanism of a transmission is simulated and analyzed by romax designer software, and the fourth gear is selected for shape modification design, in which the orthogonal experimental design and genetic algorithm optimization are applied

1) The three-dimensional modification optimization of gear can effectively improve the bearing capacity of gear, reduce the transmission error range of gear, improve the stress distribution of gear, optimize the meshing performance of gear, so as to reduce the vibration and noise.

2) In the process of gear modification, the combination of orthogonal experimental design and genetic algorithm optimization can effectively obtain the optimal combination of gear modification parameters, and achieve the purpose of improving gear meshing performance. The effectiveness of the method is verified by vehicle test.

Using romax Designer Based on the theory of gear modification and tooth profile modification, the variable range of gear modification parameters is determined by orthogonal test principle, and then the optimal combination of gear modification parameters is determined by genetic algorithm. The improved method is verified by vehicle test The effectiveness of the system. Through the three-dimensional modification of the gear, the transmission performance of the gear can be effectively improved, the meshing condition of the gear can be optimized, and the vibration and noise can be reduced.

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