Abstract
The high temperature rise of grease lubricated angular contact ball bearing under high speed operation will affect the working accuracy of the bearing, and even lead to the loss of accuracy. In this paper, a friction heat generation model for high-speed grease lubricated angular contact ball bearing was established. Based on the quasi-static analysis model, the thermal expansion of the bearing components is brought into the quasi-static equilibrium equation, and the modified quasi-static analysis model of high-speed grease lubricated ACBB is obtained. Under grease lubrication conditions, a local bearing heat-generation model was employed to assess power losses in different contact zones, in which bearing contact parameters, external loads, and rotation speeds conditions were fully considered. Moreover, the temperature distribution of grease lubricated high-speed bearing was analyzed by the multi node thermal network method. Through the analysis model of bearing dynamic and thermal characteristics considering the influence of thermal expansion established, bearing contact parameters have significant differences. The calculated values of outer ring temperature of grease lubricated angular contact ball bearing is in good agreement with the experimental values. The model can predict the temperature values of grease lubricated angular contact ball bearing under axial load at high speed.
Highlights
High-speed grease-lubricated rolling bearings mainly refers to the bearings with dm 3 n values over 1:0 3 106mm Á r=min: In practical application of rolling bearings, grease lubrication is more common than oil lubrication, which covers about 80% of lubrication area in rolling bearings.[1,2]
The heat generation calculation and heat transfer model of angular contact ball bearing under high speed condition, especially grease lubricated bearing, need to be further discussed, and the influence of thermal expansion on bearing temperature is not sufficient
The distribution of bearing temperature field can be obtained by solving the heat balance equations under considering the mechanical model of thermal expansion, calculation of grease lubrication heat generation, and heat transfer model
Summary
High-speed grease-lubricated rolling bearings mainly refers to the bearings with dm 3 n values over 1:0 3 106mm Á r=min: In practical application of rolling bearings, grease lubrication is more common than oil lubrication, which covers about 80% of lubrication area in rolling bearings.[1,2] The advantage of grease are as follows. The heat generation calculation and heat transfer model of angular contact ball bearing under high speed condition, especially grease lubricated bearing, need to be further discussed, and the influence of thermal expansion on bearing temperature is not sufficient. For the grease lubricated angular contact ball bearing, the researches by considering the thermal expansion of the grease lubricated bearing at high speed and using the local heat generation method and the heat network transfer method to calculate the temperature distribution of the rolling contact surface were rarely reported. The distribution of bearing temperature field can be obtained by solving the heat balance equations under considering the mechanical model of thermal expansion, calculation of grease lubrication heat generation, and heat transfer model.
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