Topic
Thrust bearing
About: Thrust bearing is a research topic. Over the lifetime, 11545 publications have been published within this topic receiving 73347 citations.
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13 Sep 1976TL;DR: In this paper, a flat plate hydrodynamic thrust bearing for rotating machinery and a scroll-type apparatus embodying the thrust bearing are described, which is particularly suited for incorporation in a closed cycle refrigeration system where minimum wear over extended periods and reliable operation are required.
Abstract: A flat plate hydrodynamic thrust bearing for orbiting machinery and scroll-type apparatus embodying the thrust bearing are disclosed. The thrust bearing exerts an axial force on the orbiting scroll member to ensure efficient radial sealing of the scroll assembly; and one of the contacting surfaces of the bearing and or of the orbiting scroll member, serving as a journal, has a plurality of intersecting groovings to ensure continuous lubrication of the surfaces. The scroll apparatus is particularly suited for incorporation in a closed cycle refrigeration system wherein minimum wear over extended periods and quiet and reliable operation are required.
117 citations
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TL;DR: In this paper, it was shown that a viscosity gradient across an oil film allowed a hydrodynamic load to be carried between rotating discs, not only through the oil film but also in the direction of motion, a considerable load can be borne.
Abstract: In a previous paper (6) it was shown that a viscosity gradient across an oil film allowed a hydrodynamic load to be carried between contra rotating discs. If there is a temperature (and viscosity) gradient, not only through the oil film but also in the direction of motion, a considerable load can be borne. The equations are set up and solved numerically giving coefficient for oil film thickness and friction. The oil film thickness is comparable (three quarters) of that carried by Michell pads. The computed results are applied to the parallel surface thrust bearing described by Fogg (2) in 1946 and shown to give tolerable agreement with the experimental findings. Contributed to the American Society of Lubrication Engineers by the author.
115 citations
TL;DR: In this paper, a comparison between experiment and simulation results has been carried out on parallel thrust bearings in terms of cavitation zone morphology in a groove, friction coefficient, and bearing clearance.
Abstract: When a textured ring rotates relatively against the other texture-free ring in a parallel thrust bearing, cavitation of liquid lubricant may occur in the divergent zones of the dimples or grooves on the textured surface due to local pressure drops. The Reynolds and Jakobsson–Floberg–Olsson (JFO) models are two widely used cavitation models in hydrodynamic lubrication theory, where the former lacks mass conservation while the latter enforces it. In order to investigate the applicability of the two models to the hydrodynamic lubrication analysis of parallel thrust bearings with surface textures, comparison between experiment and simulation results has been carried out on parallel thrust bearings in terms of cavitation zone morphology in a groove, friction coefficient, and bearing clearance. The results have shown that the observed cavitation morphology in steady state is more similar to the prediction from the JFO model than that from the Reynolds model.
110 citations
TL;DR: In this paper, a class of gas lubricated foil thrust bearings has been investigated analytically utilizing a novel approach which combines Finite Difference (FD) and Finite Element (FE) methods.
Abstract: Load performance of gas lubricated, compliant surface foil thrust bearings has an interlocking relationship with the compliance of the bearing and hydrodynamics of convergent wedge surface. Compliance of the bearing consists of supporting spring elements (elastic foundation) and a smooth elastic top foil. In this paper, a class of gas lubricated foil thrust bearings has been investigated analytically utilizing a novel approach which combines Finite Difference (FD) and Finite Element (FE) methods. Solution of the governing hydrodynamic equations dealing with compressible fluid is coupled with the structural resiliency of the foil bearing surfaces. FD method is utilized for hydrodynamic analysis while FE is used to model structural resiliency. Influence coefficients were generated to address the elasticity effects of combined top foil and elastic foundation on the hydrodynamics of thrust bearing, and were used to expedite the numerical solution. Within 2 to 3 iterations the convergence criterion was reached. The overall program logic proved to be an efficient technique to deal with the complex structural compliance of various foil bearing. Case study has been conducted and sample solutions are provided. Unlike prior analytical investigations, the essential effect of the top foil on the performance of the bearing has been elucidated.
109 citations
TL;DR: In this paper, it was shown that it is possible to make a wear-resistant thrust bearing able to take up to about 1 kg thrust from a shaft rotating at at least 50,000 rp.m. without incurring a power consumption much in excess of 1.5 watts.
Abstract: Our work on spiral groove bearings in the Research Laboratories began in 1960, when we were consulted on the following problem. Would it be possible to make a wear‐resistant thrust bearing able to take up to about 1 kg thrust from a shaft rotating at at least 50,000 r.p.m., without incurring a power consumption much in excess of 1.5 watts ? The bearing was to support the end of the shaft, and it had to be suitable for operation in a vacuum.
106 citations