Thrust bearing

About: Thrust bearing is a research topic. Over the lifetime, 11545 publications have been published within this topic receiving 73347 citations.

Dynamic pressure bearing device

Abstract: A dynamic pressure bearing device includes a rotary shaft, a dynamic pressure bearing member for supporting the rotary shaft, two radial dynamic pressure bearing parts and a thrust dynamic pressure bearing part formed between the dynamic pressure bearing member and the rotary shaft, and a lubricating fluid continuously filled in the two radial bearing parts and the thrust bearing part. A bypass passage for pressure release is provided for communicating across the two radial dynamic pressure bearing parts to flow the lubricating fluid corresponding to the amount of the unbalance caused by the unbalance of the pumping effect forces from a high-pressure side to a low-pressure side through the bypass passage to reduce the unbalance.

Well drilling tool with diamond radial/thrust bearings

Abstract: A turbodrill is disclosed for connection to a drill string and has a rotating shaft for turning a drill bit. The turbodrill has rotor and stator blades operated by drilling mud flowing therethrough to rotate the shaft. The shaft is provided with radial/thrust bearing consisting of a pair of annular plates, each of which has conical surfaces supporting a plurality of friction bearing members of polycrystalline diamond. The radial and thrust loads are carried by the wear-resistant diamond bearing surfaces. The bearing members are preferably cylindrical studs having flat faces with flat disc-shaped diamond bearing members supported thereon around the adjacent surfaces of the supporting plates. The faces of the diamond bearings will wear into smoothly mating conical bearing surfaces with use. There are two or more pairs of diamond radial/thrust bearings to handle longitudinal as well as radial loads. The use of the diamond radial/thrust bearings makes it possible to eliminate the lubricant-flooded construction of prior art turbodrills and allow the bearings to be cooled and lubricated be drilling fluid flowing therethrough. The diamond radial/thrust bearings may be used with lubricant-flooded turbodrills and with other types of downhole motor driven drills such as drills driven by positive displacement motors.

Hydrodynamic Lubrication: Bearings and Thrust Bearings

Abstract: Part 1 Tribology from antiquity to our times: the prehistoric period the Greek and Roman period Middle Ages and Renaissance toward the Industrial Revolution the Industrial Revolution tribology in the 20th century. Part 2 Lubricating oils: base oil additive agents viscosity of lubricants viscosimetry viscosity variation with temperature viscosity variation with pressure lubricants specifications non-Newtonian behaviour of lubricants viscosity of gases. Part 3 General equations in hydrodynamic lubrication with a Newtonian fluid: generalized equations of the mechanics of viscous thin films physical interpretation energy equation in the mechanics of viscous thin films particular forms of the generalized equation of the mechanics of viscous thin films boundary conditions for smooth surfaces solving algorithms calculus of various parameters of the contact study of elementary loading cases applications remark on the Reynolds equation. Part 4 Plane sliders and thrust bearing pads: plane sliders with fixed geometry pad of finite dimensions thrust bearings with fixed geometry tilting pad thrust bearing global thermal effects theory-experiment comparisons. Part 5 Static characteristics of journal bearings: laminar journal bearings general considerations infinitely long journal bearing the short bearing finite journal bearing global thermal effect application to the design of a journal bearing theory-experiment comparison. Part 6 Dynamic characteristics of journal bearings: Reynolds equation in dynamic regime linear modelling - dynamic coefficients infinitely-short bearing infinitely-long bearing finite width bearing stability of journal bearing operation linear analysis theory-experiment comparison. Part 7 Non circular journal bearings with fixed geometry and with tilting pads: multiple-lobe bearing tilting pad journal bearing. Part 8 Journal bearings subjected to dynamic loading: rotor bearings study of connecting-rod bearings. Part 9 Influence of shape defects and of surface deformations: basic equations and general considerations shape defects linked to machining flaws shape defects generated by deformations under dynamic loading shape defects generated by instantaneous deformation in transitory regime. Part 10 Thermal effects in hydrodynamic journal bearings: basic equations numerical methods results theory - experiment comparison. Part 11 Superlaminar flow regimes: inertia forces in bearings in laminar regime Taylor's vortex regime in smooth bearings transition in thrust bearings turbulent flow comparison between theoretical results and experiments application to a turbine bearing thermal effects in non laminar regime. (Part contents)

Percutaneous axial flow blood pump

Abstract: The reliability and compactness of a percutaneously insertable intravascular axial flow blood pump are improved by connecting the pump's rotor and drive cable through a resiliently extendable rotor extension. The rotor extension and drive cable fitting are so designed that the thrust bearing surfaces of the purge seal and cable fitting can be preloaded by strongly pulling the cable fitting against the resiliency of the rotor extension to move one of the bearings away from the other, then relaxing it to a predetermined preload, and finally immobilizing the bearing in the position corresponding to that preload.

Analysis of an Aerodynamic Compliant Foil Thrust Bearing: Method for a Rapid Design

Abstract: A very simple design method for an aerodynamic compliant foil thrust bearing is presented in this paper. It is based on 3D modeling (called: complete direct calculation) of the elastoaerodynamic problem. In this approach, the structural analysis has been simplified. This enables the calculation to be carried out faster. However this model, based on the resolution of the Reynolds equation, only gives the performance of a thrust bearing for a given geometric profile. An efficient method for solving the inverse problem for predicting the desired bearing performance parameters is presented. The complete direct calculation is only used to improve the profile geometry thus found. Finally, the proposed method has been applied for the design of a 80 mm outer diameter 40 mm inner diameter thrust bearing operating between 20,000 and 50,000 rpm. It is shown that the thrust bearing designed by this approach has a high load capacity (300 kPa) at a speed of 50,000 rpm. It is also shown that the predicted performance of the bearing agrees well with the complete direct calculation.