Research on Steady-state Temperature Field and Thermal Deformation Field of Electric Drive Helical Gear
In order to obtain the steady-state temperature field and thermal deformation field of the electric drive helical gear,based on the meshing principle of the helical gear and the theory of heat transfer and tribology,the calculation method of the average friction heat flux on the meshing surface of the helical gear and the convective heat transfer coefficient of other surfaces is derived.Based on APDL language,the parametric thermal analysis model of the helical gear is established,and the steady-state temperature field and thermal deformation field of the helical gear are obtained.The influence of different gear models on the steady-state temperature field and thermal deformation field is revealed.The results show that the steady-state temperature field presents a gradient change,in which the temperature of the meshing surface is the highest and the temperature of the hub is the lowest.There are two high temperature regions on the meshing surface,which are located in the two double-tooth meshing regions.In the direction of tooth height,the tooth surface temperature is distributed in the shape of'M'.The maximum temperature in the double-tooth meshing area at the meshing end of the driving wheel is close to the tooth root,while the maximum temperature in the double-tooth meshing area at the meshing end is close to the tooth top.In the direction of tooth width,the tooth surface temperature is asymmetrically distributed.For the clockwise rotating right-hand drive wheel,the high temperature zone in the meshing area of the meshing end is close to the front end of the gear,and the high temperature zone in the meshing area of the meshing end is close to the back end of the gear.Due to the cumulative thermal deformation of the deformed helical gear,the total thermal deformation of the tooth top is the largest,the hub is the lowest,and the maximum deformation area is located near the two ends of the gear.When considering the deformation in the direction of the meshing line,in the direction of the tooth width,the thermal deformation of the rear end face is larger than that of the front end face,which is consistent with the temperature distribution along the tooth width.In order to save the calculation cost,the single-tooth model can be used to replace the full-tooth model when calculating the steady-state temperature field and has high accuracy.However,only the full-tooth model is accurate when calculating the thermal deformation field,and other models have large errors.
helical gearfinite elementsteady state temperature fieldthermal deformation field
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