Abstract
Fluid-solid coupling theory is introduced into tripod sliding universal joint design. The geometric models of the tripod sliding universal joint and lubricant film are established respectively and meshed. Fluid-solid coupling analyses of tripod sliding universal joints in unidirectional and bidirectional scenarios are performed to investigate sleeve and lubricant film coupling as well as sliding pin and lubricant film coupling under various differential pressures and frequencies. In the condition of unidirectional and bidirectional coupling, sleeve and sliding pin deformation and stress increase gradually with differential pressure and frequency. Under various differential pressures and frequencies, tripod sliding universal joint bidirectional coupling deformation and stress are greater than those of unidirectional coupling. The theory of fluid-solid coupling is combined with the tripod sliding universal joint for the first time in this paper. The fluid-solid coupling analysis results are of great significance and benefit to the design, application and marketing of tripod sliding universal joints.
Highlights
Fluid-solid coupling is a cross-disciplinary science that combines higher mathematics, fluid mechanics and solid mechanics to investigate fluid-solid coupling
Overall sliding pin deformation along the axis demonstrates the trend of gradual change, which results in local convergence and diffusion clearance and changes the structure of the lubricant film at the clearance of the tripod sliding universal joint and affects parameters in the lubricant film flow field
Lubricant film pressure increases with differential pressure and frequency
Summary
Fluid-solid coupling is a cross-disciplinary science that combines higher mathematics, fluid mechanics and solid mechanics to investigate fluid-solid coupling. Wodtke et al employed the fluid-solid coupling method to analyze the thermal elastohydrodynamic lubrication of bearings and gears [2]. Tian et al created a new rigidflexible multi-system model and employed a fluid-solid coupling method to calculate lubricant film pressure distribution [3]. Xu investigated the bidirectional fluid-solid coupling dynamics modeling of aqueduct structure [5]. Zhang et al solved fluid-solid thermal coupling system (bearing, lubricating oil and axial diameter) for turbo-generator journal bearings [6]. Mao et al investigated and analyzed the dynamic characteristics of non-linear oil films of sliding bearings based on fluid-solid coupling [7]. Shi et al performed fluid-solid coupling simulation analyses for hydrodynamic journal bearings [8].
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