Abstract
In this study, two-row tapered roller bearings (TBR) with different rib structures were tested under the condition of loss of lubrication. It was found that the double-row TBR with outer ring rib structure worked normally after 40 min of the test, but the inner ring The bearing of the side structure has failed. In order to explain this phenomenon, computational fluid dynamics (CFD) numerical simulation models of two structural bearings were established, and the flow characteristics of the oil in the bearing cavity under the conditions of full lubrication and loss of lubrication were studied by the method of discrete inlet oil volume. The research results show that, in the fully lubricated state, the oil volume fraction of the double-row TBR outer ring wall of the outer ring rib structure is 11.296 times higher than that of the inner ring rib structure. Moreover, the volume fraction of oil on the roller surface is 2.07 times higher in the outer ring rib structure than the inner ring rib structure. The volume fraction of lubricating oil in the bearing cavity decreases as the speed increases; however, the double-row TBR with the outer ring rib structure still shows a better lubrication effect than the inner ring rib structure. In the final stage of the loss of lubrication, the volume fraction of the bearing flow field of the outer ring rib structure is twice that of the inner ring rib structure, making the outer ring rib structure double-row tapered roller bearing (TBR) more dry Operational ability.
Highlights
Double-row tapered roller bearings (TBR) can withstand large radial and axial loads.These attributes have facilitated their wide application in helicopter transmission systems and other important fields
The distribution of lubricating oil flow fields in the bearing cavity of double-row TBRs is directly related to their service life
Six oil ports are uniformly distributed on outer ring The of the bearing, where oil ports are for oil filling, andthethe other internal flow field two analysis model of used the bearing is extracted using the fou ring of the bearing, where two oil ports are used for oil filling, and the other four are pressure outlets. as
Summary
Double-row tapered roller bearings (TBR) can withstand large radial and axial loads. These attributes have facilitated their wide application in helicopter transmission systems and other important fields. Hu et al [10] established a 3D transient simulation model of the oil-gas two-phase flow in high-speed angular contact ball bearings based on the VOF method and sliding mesh technique. They studied the characteristics of the flow field in the bearing cavity and obtained the distribution law of lubricating oil—such that the average volume fraction of the lubricating oil decreases with the increase of rotational speed but increases with the increase of oil flow. Guide the selection of double-row tapered roller bearings (TBR) under similar working conditions
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