Abstract

The lubrication of high-speed bearings in variable-speed transmission systems is typically achieved through radial under-race lubrication devices, where the performance of the oil capture section significantly affects the overall lubrication performance. To improve the oil capture performance of radial under-race lubrication devices, this study analyzed the flow mechanism of lubricating oil in the under-race oil capture section to investigate the main factors influencing the oil capture performance. Based on the bearing cavity structure of a specific high-speed bearing, a preliminary design of the oil scoop was conducted. A numerical model of the flow field in the radial under-race lubrication oil capture section was established using CFD methods. Simulations were performed to study the influence patterns of these factors on the oil capture efficiency of the scoop, followed by preliminary optimization of the oil scoop. Through visualization analysis, the main causes of lubricating oil loss were identified, and further optimization of the scoop structure was carried out, significantly improving the oil capture efficiency of the scoop. An oil scoop performance test bench was designed and constructed, and experiments were conducted. The experimental results showed good agreement with the simulation results.

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