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This Note proposes a novel radial- thrust combo metal mesh foil bearing (MMFB).
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Park, Cheol Hoon Choi, Sang Kyu Hong, Doo Euy Yoon, Tae Gwang Lee, Sung Hwi Note: Radial- thrust combo metal mesh foil bearing for microturbomachinery Performance of a resilient-pad bearing is compared with that of a pivoted-pad bearing. The effects of bearing design parameters on performance are shown. The bearing consists of sector-shaped pads mounted asymmetrically on resilient foil beams. An axially aligned shaft pin provides the bearing surface for low rotational speeds, but at higher speed, weights operating against spring tension withdraw nthe shaft pin into the bearing proper and the rotor shaft comes in contact with the large bearing surfaces.Īnalysis of an all-metallic resilient-pad gas-lubricated thrust bearingĪ resilient-pad gas thrust bearing that does not contain any elastomers in the bearing assembly is described and analyzed. A low viscosity fluid is used to lubricate the higher speed operation bearing, in connection with broad hearing -surfaces, the ability to withstand great loads, and a relatively high friction loss, as contraated to the lower speed operatio n bearing which will withstand only light thrust loads but is sufficiently frictionfree to avoid bearing seizure during slow speed or startup operation. A centrifagal jack is provided so thnt the device may opernte on one hearing at starting and lower speeds, and transfer the load to another bearing at higher speeds. Advantages of Cantilever-mounted Thrust Bearing are greater tolerance to dirt ingestion, good initial lift-off characteristics, and operational capability over wide temperature range.Ī thrust bearing suitable for use with a rotor or blower that is to rotate about a vertical axis is descrihed. Dual-Action Gas Thrust Bearing's load-carrying capacity is more than ninety percent greater than that of single-action bearing over range of compressibility numbers. Two variations of gas-lubricated thrust bearings extend substantially load-carrying range over existing gas bearings. It may also be arranged to respond to rotation in one or both directions. The bearing may be arranged for load equalization thereby avoiding the necessity of gimbal mounts or the like for the bearing. The resilience of the beam mount causes the pads to accept the load and, with proper design, responds to a rotating thrust-transmitting collar by creating a gas film between the pads and the thrust collar.
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This annulus acts as a beam on which are mounted bearing pads. Procedure saves energy because it requires no liquid nitrogen for cooling shaft and no natural gas or electric power for operating vacuum oven.Ī gas lubricated thrust bearing is described which employs relatively rigid inwardly cantilevered spokes carrying a relatively resilient annular member or annulus. Method eliminates cooling and vacuum-drying steps which saves time, while also eliminating possibility of corrosion formation. Special handling sleeve, key to method of installing thrust bearings, was developed for assembling bearings on shaft of low-pressure oxygen turbo-pump. Head’s flat, new head gasket, what am I missing? Thoughts most appreciated.Simplified installation of thrust bearings When water is lost at allen screw, the head starts to get hot there. Water is spurting out mid section at low throttle. I would think more water with more rev’s. As I slowly start to rev it, the water starts to sputter, at about half throttle, it disappears into the head completely. I remove allen screw and water is coming out of head like a small spring. Everything re-assempled and off the the test tank. There is a allen screw in the top of the head leading to the head water passage at top. Cleaned all the water passages while it was off tower. I touched up the head to flatten it out and found a new head gasket. I did, and it was not in wonderful shape. Water pumps were gone when he asked me to help him, it didn’t look too discolored at the head. He was out 20 minutes and over heated it. Looked like it was pumping well in the barrel, but I didn’t rev it hard. I put one new impeller in the bottom cartridge and left the top one out, with no need of the bailer. It is a bail O matic, with the pumps on the lower unit. I have been messing with this little Ted Williams 7.5 motor for a while.
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