| Hot shaft fault is one of the common faults in railway wagon operation.Under heavy load and high speed conditions,excessive friction heat of bearings and poor heat dissipation performance of bearings jointly cause high temperature rise of bearings,resulting in hot shaft failure.If the fault of hot shaft is light,it will lead to vehicle stopping,wheel changing and off-loading,affecting cargo transportation efficiency and disturbing vehicle driving order,and if it is serious,it will cause serious accidents such as burning shaft and hot shaft,which will seriously affect vehicle driving safety.In order to explore the mechanism and influencing factors of temperature rise of railway wagon bearing and reduce the incidence of hot shaft failure,it is necessary to study the characteristics of temperature rise of railway wagon bearing.This paper takes 353130 B double row tapered roller bearings assembled by railway wagon as the research object.Based on Hertz contact theory,a numerical model of contact stress between tapered roller and raceway and a quasi-static model of double row tapered roller bearing were established to analyze the forced of railway wagon bearing.Adopt local method,a calculation model of friction power consumption between rolling body and raceway,between rolling body and inner ring rim,and between rolling body and cage of railway wagon bearing were established,and the influence rules of working conditions and structural parameters of railway wagon bearing on friction power consumption of railway wagon bearing were analyzed.Based on the above research,based on Ansys Workbench finite element analysis software,a simulation model of railway wagon bearing temperature rise was established to analyze the influence of multiple factors on the characteristics of railway wagon bearing temperature rise.Finally,the temperature rise test was carried out on the railway bearing test stand to test the temperature rise of bearings under different loads and speeds,and the test results were compared with the simulation results to verify the established model.The results show that the highest temperature rise of the bearing system is located at the contact position between the big rim of the inner ring of the second row and the base surface of the roller ball.The temperature rise of the right half of the bearing system is higher than that of the left half,and the temperature rise of the second row of bearings is also higher than that of the first row of bearings.The temperature distribution on the same surface in the bearing system is maldistribution.The temperature rise of railway wagon bearing increases with the increase of load.The temperature rise of railway wagon bearing increases with the increase of speed,and the temperature of bearing outer ring rises about 5.2℃ for every 12Km/h increase of the train speed.The temperature rise of railway wagon increases with the increase of ambient temperature,and the temperature of bearing outer ring rises about 11.8℃ for every 10℃ increase of ambient temperature.The temperature rise of railway wagon bearing increases with the increase of the contact position between the inner rim and the base surface of roller ball,and the temperature of bearing outer ring rises about 6.6℃ for every 1mm increase of the contact position.Finally,by comparing the temperature rise test results of railway wagon bearing with the simulation results,it is found that the variation trend of the simulation results is consistent with the test results,and the maximum error between the simulation results and the test results is 13.8%.The rationality of the model is verified by the test.The research results of this paper have certain reference value for the design and use of railway wagon bearings. |
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