Research Of The Influence Of Tooth Surface Wear And Bearing Clearance On Gear System Dynamics

Gear transmission system is one of the most common and important power and motion transmission forms in various mechanical equipment.During its operation,the tooth surface will be worn,which will cause changes in meshing stiffness and other parameters.Tooth surface wear and bearing clearance affect the dynamic characteristics of gear transmission system.In order to reveal the influence of tooth surface wear process and bearing clearance on the dynamics of gear system,adjust bearing clearance during wear process and monitor gear wear effectively,a six-degree-of-freedom non-linear dynamic model of gear transmission system with gear wear and bearing clearance is established in this paper.The dynamic response of gear transmission system under different wear states and bearing clearances is analyzed.The gear running tests under different wear cycles and bearing clearances are carried out,and the simulation results are verified.The main contents of this paper are as follows:(1)Firstly,the relationship between the radial clearance of the bearing and the actual center distance of the gear is theoretically derived.Then the relationship between the actual center distance of the gear and the backlash is derived.The relationship between the bearing clearance and the backlash is constructed with the actual center distance as the bridge.At the same time,the situation of tooth surface wear is discussed.It lays an important foundation for the calculation of the meshing stiffness under the different wear cycles and bearing clearances.Finally,the six-degree-of-freedom nonlinear dynamics model of the gear system is established with the lumped mass method.(2)In this paper,the time-varying meshing stiffness of gears is calculated by Weber material method.The influence of tooth surface wear and radial clearance of bearings is considered in the calculation process.Finally,the time-varying meshing stiffness of gears with different wear cycles and radial clearance of bearings is obtained,which lays a foundation for subsequent dynamic analysis.(3)According to the research content and relevant test regulations,an electric power closed single-stage involute spur gear test rig was built.Gear vibration tests with different bearing clearances and wear cycles are carried out,and the vibration test data of the gear system with different wear cycles and different bearing clearances are obtained by the acceleration sensors,which provides data support for subsequent simulation and test analysis.(4)Comparing the simulation results and test results with the different bearing radial clearance,the vibration response law of the bearing radial clearance to the gear system is obtained.Then,the simulation results and test results under different wear cycles are compared.The vibration response law of the wear to the gear system gear system is obtained,and the correctness of the simulation model is verified.Finally,the influence of bearing clearance on system vibration under different wear cycles is obtained.It provides theoretical basis and experimental support for accurate monitoring of gear wear and vibration and noise reduction of gear system in actual production process.