Study On Tooth Surface Wear Of Spur Bevel Gear Under Quasi-static Condition

Bevel gear transmission device is widely used in the pillar industries of the national economy such as automobile,shipbuilding and aviation because of its strong bearing capacity,accurate transmission ratio,stable operation and high efficiency.In practical applications,with the operation of the gear device,the tooth surface of the gear will be worn,which will affect the transmission performance of the gear system and reduce the service life of the gear.It is worth noting that the deepening wear process on the tooth surface will induce other failure forms of the gear system,which will in turn lead to the gear system not functioning properly.Therefore,this paper takes the spur bevel gear as the research object to carry out the research on the tooth surface wear,so as to reveal the general rule of the tooth surface wear of the spur bevel gear,and provide a theoretical basis for the gear tooth surface reduction and life extension.To summarize the full text,the main contents are as follows:Firstly,the tooth profile and meshing principle of the spur bevel gear are analyzed,and a three-dimensional model of a pair of standard spur bevel gears is established by using the three-dimensional modeling software.On this basis,the finite element model of the gear pair is established by using the finite element software,and the contact stress distribution of the gear pair under different loads is analyzed.The research results show that the tooth surface contact area of the spur bevel gear pair is a narrow contact strip along the tooth width direction,and the tooth surface contact stress distribution is uneven,and different stress concentrations appear at the large and small ends,and the contact stress at the large end is greater.Secondly,based on Hertz’s contact theory and Archard’s wear formula,the quasistatic tooth surface wear model of spur bevel gear pair is established.Based on Hertz’s contact theory and combined with finite element software,the contact stress of tooth surface is obtained.By analyzing the moving speed of the two contact gear tooth,the relative sliding distance of the driving and the driven gear is calculated respectively.Combined with the Archard’s wear formula,the tooth surface wear model of the spur bevel gear under quasi-static conditions was established,and the wear depth of the spur tooth bevel surface was calculated.The results show that the tooth surface wear depth of the spur bevel gear pair is not evenly distributed along the tooth width direction under ideal working conditions,and the tooth surface wear depth decreases successively from the large end to the small end;The minimum tooth surface wear depth of spur bevel gear pair along the direction of tooth profile is located at the pitch circle position,and the maximum wear depth is located near the root region of the pinion gear;as the number of wear cycles increases,the tooth surface wear depth of the driving and driven gears gradually increases.Finally,based on the established quasi-static tooth surface wear model of the spur bevel gear pair,the influence of the tooth top chamfer,load torque and installation error on the tooth surface wear depth is analyzed.The analysis results show that proper chamfering of the tooth tip can significantly reduce the tooth surface wear,thus prolonging the service life of the gear;the change of the load torque does not change the distribution law of the tooth surface wear,but the tooth surface wear depth increases significantly with the increase of torque;controlling the installation error of the gear can ensure that the load distribution on gear tooth surface is uniform and thus reduce the tooth surface wear.