| In modern industry,gears are widely used.However,in some high-speed and heavyduty working conditions,higher requirements for the performance of gear materials,and herringbone gears have strong load-bearing capacity due to their structure,and have good stability and high efficiency in the transmission process.They are used in aerospace and aviation.Ships and other fields are widely used.However,during the high-speed and heavy-duty transmission of herringbone gears,the friction of the tooth surface generates a lot of heat,which causes the gear teeth to bear the heat load.Excessive temperature will reduce the transmission efficiency,and also cause the lubrication performance of the gear teeth and the surface of the gear teeth.Deformation,which in turn affects the instantaneous temperature of the tooth surface,causes the gear tooth surface to glue.Therefore,this paper takes herringbone gear transmission as the research object,based on tooth surface contact analysis technology,tooth surface load-bearing contact analysis technology and thermal elastohydrodynamic lubrication theory,combined with Blok flash temperature theory to carry out flash temperature calculation and gluing analysis of herringbone gear transmission.It establishes a theoretical basis for the further research of the follow-up herringbone gear transmission system and the gear tooth modification design.The main research contents of this paper are as follows:(1)Based on the tooth surface contact analysis,taking the herringbone gear transmission as the research object,the basic meshing formula between the herringbone gear tooth surfaces is deduced,and the actual meshing line length and the total coincidence degree of the one-side gear tooth of the herringbone gear are developed.The analysis and calculation,combined with the actual meshing process,through the analysis of the change process of the tooth surface contact line,deduced the contact line length change formula of a single tooth on the side of the herringbone gear,and finally obtained the contact line length of a single tooth during the meshing process The change in the length of the total contact line.(2)An analysis model of the local contact area of the herringbone gear is established,and the related function formulas of the long axis and the short axis length of the tooth surface contact area on the left and right sides of the herringbone gear are derived.On this basis,the local contact area is analyzed.Fine mesh division,and then discretized the local contact area into a small rectangular area,deduced the relative sliding speed of the tooth surface contact point and the comprehensive curvature radius formula,and based on the tooth surface load-bearing contact analysis technology,established a herringbone gear transmission The load-bearing contact coupling analysis model of the system is carried out to analyze the tooth surface load-bearing contact analysis of the herringbone gear transmission system,and the load distribution coefficients on the left and right sides of the herringbone gear are obtained.In order to avoid the occurrence of eccentric load,the herringbone gear Adopt the method of axial floating installation of the driving wheel,so that the load on the left and right sides of the tooth surface is evenly distributed.(3)Based on the analysis of the mechanism of gear thermal bonding failure,combined with the theory of thermal elastohydrodynamic lubrication,a point-contact thermal elastohydrodynamic lubrication analysis model was established,thereby obtaining the control equation of the herringbone gear’s point-contact thermal elastohydrodynamic lubrication,and The lubrication control equation is processed in a dimensionless manner,and three representative special positions,namely the initial position of the tooth surface meshing on the left and right sides of the herringbone gear,the node and the engagement point,are selected,and the herringbone gear transmission system is obtained under high-speed and heavy-duty conditions.The lubrication characteristics of the herringbone gear transmission system under different torque and speed conditions have been further studied.The analysis results show that as the input torque increases,the oil film pressure increases,so,The oil film thickness decreases,and the oil film center temperature also increases;when the input torque is unchanged and the speed increases,the oil film center pressure remains almost unchanged,but the film thickness decreases to a certain extent,while the oil film center temperature is As the speed increases,it rises.(4)Based on the herringbone gear tooth surface load-bearing contact analysis,combined with Blok flash temperature theory,the flash temperature calculation discrete formula based on the tooth surface load-bearing contact analysis technology is established,and the flash temperature distribution on the left and right sides of the herringbone gear is obtained.The results of Romax simulation results,thermal elastohydrodynamic lubrication calculation results and traditional ISO calculation method results are compared and analyzed.The results show that the flash temperature theoretical calculation results based on the tooth surface load-bearing contact analysis technology and the Romax simulation results,thermal elastohydrodynamic lubrication The difference between the calculation results and the results of the traditional ISO calculation method is no more than 6%,which further verifies the accuracy and reliability of the flash temperature theoretical calculation method in this paper.Finally,the analysis of the influence of different parameters on the gear flash temperature system is carried out,and the highest contact temperature judgment method is used to check the gluing of the herringbone gear transmission system under high speed and heavy load. |
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