| The electric transmission gear coupling mechanism is the key component of the hybrid armored vehicle,and its dynamic response is one of the vibration excitation sources of the vehicle.In this paper,aiming at the electric transmission gear coupling mechanism of a hybrid armored vehicle,multi-body dynamics and finite element method are used to model the dynamic characteristics of the gear coupling mechanism and the mechanism box,to explore the influence law of planetary gear meshing force,to calculate the dynamic meshing force of the gear coupling mechanism,and to verify the bearing capacity of the coupling mechanism box.Therefore,the theoretical basis for the study of vibration reduction and noise reduction of the electric drive coupling mechanism is provided.The main research work includes:1)This paper analyzes the physical model of the coupling mechanism of the electric drive gear.Based on the study of the dynamics of the single row planetary gear,several single row planetary gears are connected in series or in parallel through the connecting shaft,and the pure torsional rotation mechanical model of the coupling mechanism is established.2)The meshing force frequency of double row planetary gears is analyzed.The influence of connection stiffness,rotation speed and load on the frequency coupling of double planetary gears is studied.In series connection,when the torsional stiffness is greater than 10~8N·mm/(?),the frequency coupling phenomenon of meshing force is stable,and the current row frequency influence ratio is always higher than the coupling frequency influence ratio;The current row frequency influence ratio increases with the increase of rotating speed,decreases with the increase of load,and the coupling frequency influence ratio is opposite;In parallel connection,the current row frequency influence ratio minus coupling frequency influence ratio is proportional to the load ratio minus speed ratio.3)By solving the natural frequency and vibration mode of the gear coupling mechanism,the dangerous working range is obtained by analyzing the Campbell diagram.Taking root mean square value of meshing force and dynamic load coefficient as evaluation indexes,the response of meshing force under typical working conditions is analyzed,and the maximum dynamic load coefficient is obtained in the motor deceleration under driving and steering conditions.The difference between the RMS value and the theoretical value is proportional to the dynamic load coefficient,and the maximum value is in the output row of the central steering condition.The reduction order of dynamic load coefficient under different working conditions is corresponding to the influence rule of parallel gear row frequency,and the coupling gear row has great influence on the dynamic load coefficient of gear coupling mechanism.4)Through the finite element analysis of the gear coupling mechanism box,the torsional mode of the box is obtained,and the possible resonance speed range is analyzed.The transient dynamic analysis of the box is carried out under the maximum dynamic meshing force and the large radius steering condition,and the maximum stress is 164.17MPa,which is less than the tensile strength of the material,and there is no danger of damage to the box due to the stress.Finally,the dangerous range of rotating speed is(6000,2800~4500)r/min?... |
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