Abstract
Generally, the movement of journal along the direction of bearing axis under the combined action of various factors is neglected in the lubrication study of bearing, which is quite different from the actual working condition of bearing in the shaft-bearing system. In this paper, with a comprehensive consideration of the axial movement of journal, the surface topography of journal and bearing and the misalignment of journal, a new model about the hydrodynamic lubrication of misaligned journal bearing is established based on the average Reynolds equation. Considering the effect of the axial movement of misaligned journal, the lubrication characteristics parameters of rough journal bearing is presented and mainly discussed. The results show that the axial movement of misaligned journal has a distinct effect on the bearing lubrication characteristics. The influence of the axial movement of misaligned journal on the bearing lubrication characteristics is slightly reduced when considering the surface roughness.
Highlights
The shaft-journal bearing system is one of the most important friction conjunctions in the mechanical devices, and is widely used in various types of transmission systems
Considering the axial velocity of misaligned journal, the radial component caused by the axial displacement and the impact of the surface topography of journal and bearing, the average Reynolds equation [22] used for the lubrication study of misaligned journal bearing can be expressed as:
∂fs ∂y þ where p is the oil film pressure, U is the velocity of journal surface at the circumferential direction, and U = pRn/30, n is the rotational speed of journal, R is the bearing radius, h is the dynamic viscopsitffiffiyffiffiffiffioffiffifffiffiffilffiffiuffiffibricant, s is the composite rms roughness, s 1⁄4 s21 þ s22, fx, fy and fs are the pressure and shear flow factors defined in references [22,23], hT is the local film thickness
Summary
The shaft-journal bearing system is one of the most important friction conjunctions in the mechanical devices, and is widely used in various types of transmission systems. Sun et al [1,2,3,4] researched the influences of the misaligned journal, surface topography and elastic deformation on the lubrication performances of bearings, and measured the misalignment angle of journal and maximum oil film pressure on the specially designed test rig. The shaft-journal bearing system is taken as the research object, based on the average Reynolds equation, a lubrication model of rough journal bearing considering the axial movement of misaligned journal is established. The influence rule of the axial movement of misaligned journal on the load-carrying capacity, oil film pressure, side leakage flow, frictional power loss and overturning moment of journal bearing with rough surface are presented and analyzed
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