In the process of straight bevel gear transmission, the indirect contact load of gear teeth is unevenly distributed along the tooth direction, and there will be obvious sudden changes. Therefore, the stiffness of gear teeth will change, and the meshing impact and vibration of the system will appear. At present, tooth profile modification technology is often used to reduce the vibration and impact of straight bevel gear transmission caused by tooth deformation and uneven load.
Focusing on the dynamics of straight bevel gear transmission, such as the dynamic excitation of straight bevel gear, the dynamic characteristics of straight bevel gear system and the dynamic response of straight bevel gear transmission, the dynamic performance of modified straight bevel gear (tooth direction equidistant modification and tooth profile arc modification) is analyzed by using the dynamic analysis software RomaxDesigner, and compared with the dynamic performance of unmodified straight bevel gear, The influence of modification on the dynamic performance of straight bevel gear and the vibration and noise in the transmission process of straight bevel gear are summarized, so as to obtain the tooth shape modification parameters suitable for specific working conditions.
The vibration characteristics of straight bevel gear transmission system is an important factor to be considered in the design of straight bevel gear transmission system. At present, many straight bevel gear scholars propose to use the method of tooth profile modification to improve the vibration performance of straight bevel gear system. Based on the three-dimensional model of modified straight bevel gear, the dynamic simulation model of modified straight bevel gear is established by setting working conditions and defining input / output in RomaxDesigner software. The linear modal flexibility of meshing dynamic response of straight bevel gear pair is used as the index to evaluate the dynamic performance of straight bevel gear pair, The influence of modification on the vibration and noise in the transmission process of the system is analyzed, and the dynamic performance of straight bevel gears before and after modification is compared.
Through the dynamic simulation analysis of the straight bevel gear transmission system before and after modification, it can be concluded that the dynamic transmission error and vibration fluctuation of the straight bevel gear after modification are significantly reduced than those before modification. Compared with the arc modification of the tooth profile, the tooth direction equidistant modification can better improve the meshing dynamic performance of the straight bevel gear, The maximum values of transmission error and linear modal flexibility of straight bevel gear with tooth profile modification are less than those of tooth profile modification. The above fully shows that reasonable tooth profile modification technology can effectively improve the dynamic behavior of straight bevel gear and reduce the vibration and impact in the meshing process of straight bevel gear.