Design And Research On The Modification Of Gear Face Of Herringbone Gear

The herringbone gear is widely used in aerospace,large ships and other fields because of its tight structure,large transmission torque,stable transmission ratio and no additional axial force.However,the rapid development of modern industry puts forward higher requirements for the transmission performance of herringbone gear.In order to improve the meshing state of the gear,reduce the vibration and noise produced in the transmission process,and thus improve the transmission performance of the gear,it is of great benefit to the national defense industry,the high-end manufacturing industry and so on.Gear statics is the foundation of gear transmission.It has become an important task in gear design to improve the static characteristics of gear and improve the applicability of gear modification by adopting appropriate modification measures.By means of shape modification theory and ROMAX software,the static characteristics and sensitivity of gear modification are analyzed in this paper,so as to improve the static characteristics of gear and improve the applicability of gear.The thesis mainly carries on the following research:(1)Based on the theory of gear modification,it is determined that the modification mode is topological modification,the modification algorithm is Monte Carlo method and genetic algorithm,and the modification curve is quadratic parabola.(2)Because the herringbone gear studied is a composite gear with small slot width,large support stiffness,high installation accuracy and symmetry,the load distribution of the left and right tooth surfaces of the herringbone gear is symmetrical.When modeling and loading the herringbone gear,the corresponding helical gear model can be built and half torque can be applied.The stress bar chart,safety factor bar chart,transmission error curve,normal load distribution chart per unit length and contact stress distribution chart are obtained.(3)Sensitivity analysis of three sets of tooth profile optimal profile modification data,three sets of tooth orientation optimal profile modification data and one set of topological optimal profile modification data,including: sensitivity analysis of profile modification parameters to transmission error and contact stress maximum,sensitivity analysis of center distance installation error to transmission error,respectively.The results show that the tooth profile modification parameters are sensitive to the transmission error,the contact stress maximum,the center distance installation error is insensitive to the gear(tooth profile modification)transmission error;the tooth direction modification parameter is insensitive to the transmission error and the contact stress maximum,the center distance installation error is sensitive to the gear(tooth direction modification);The topology modification is sensitive to the transmission error,the contact stress is not sensitive,and the center distance installation error is not sensitive to the gear(topology modification).(4)The transmission error amplitude of the standard tooth surface is measured by using the built transmission error test bench,which is compared with the transmission error amplitude calculated by the ROAMAX software.The amplitude of transmission error obtained by theoretical calculation is consistent with the variation law of transmission error amplitude measured by experiment.