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Topic: Foil bearing

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	Foil bearing and spindle device using the same - US Patent 6848828 (Site not responding. Last check: 2007-10-09)
		The foil bearing as claimed in claim 1, wherein the elastic member has first and second opposite surfaces that are brought into contact with a bearing housing for supporting the elastic member and the bearing foil, respectively, at least one of the first and second surfaces of the elastic member being corrugated.
		The foil bearing as claimed in claim 1, wherein the elastic member is made up of a plurality of divided elastic segments arranged in a predetermined direction, each of the divided elastic segments having at least one of a different wire diameter and a different density of disposition of the wires.
		Specifically, the foil bearing used therein is of the structure including a bearing foil having a bearing surface confronting the rotary shaft and an elastic member interposed between the housing and the bearing foil to elastically support the bearing foil.
	www.patentstorm.us /patents/6848828.html (8877 words)

	Foil bearing - Wikipedia, the free encyclopedia
		Foil bearings require no pressure system for the working fluid, the hydrodynamic bearing is self starting.
		Foil bearings were introduced commercially in 1969 by Garrett Systems AiResearch on the DC-10's ventilation equipment.
		The main advantage of foil bearings is the elimination of the oil systems required by traditional bearing designs.
	en.wikipedia.org /wiki/Foil_bearing (206 words)

	Foil bearing surfaces and method of making same - Patent 4654939
		Such foils, which are generally thin sheets of a compliant material, are deflected by the hydrodynamic film forces between adjacent bearing surfaces and the foils thus enhance the hydrodynamic characteristics of the fluid bearings and also provide improved operation under extreme load conditions when normal bearing failure might otherwise occur.
		This may be between the foils and a shaft or bushing or in the case of thrust bearings, with respect to a thrust plate or runner.
		Foil bearing surfaces are formed with reservoirs of dry lubricant dispersed on the contact surfaces thereof in a patterned matrix such that any rubbing between surfaces will be across a number of these reservoirs.
	www.freepatentsonline.com /4654939.html (4323 words)

	Foil thrust bearing - US Patent 6354741 (Site not responding. Last check: 2007-10-09)
		The foil thrust bearing of claim 6, wherein said inner ramps are disposed adjacent an inner diameter of said thrust bearing disk and said outer ramps are disposed adjacent an outer diameter of said thrust bearing disk.
		Foils (or thin sheets of a compliant material) disposed in the spacing are deflected by the hydrodynamic film forces between the adjacent bearing surfaces.
		The bearing 10 generally comprises the components of a thrust runner 11, a thrust bearing disk 14, an underspring element or thrust bearing stiffener 22, and a thrust plate 28.
	www.patentstorm.us /patents/6354741.html (3311 words)

	Variable preload foil bearing - Patent 4445792
		In a hydrodynamic foil bearing of the type having an axial shaft rotatably supported with respect to a housing by a plurality of cantilevered foils bearing against the shaft surface, means for adjustably mounting the foils with respect to the housing to vary the preload of the foils against the shaft surface, comprising,
		Typically, in a hydrodynamic bearing, a shaft rotatably contained within a housing is surrounded by a series of foils cantilevered from the housing which wrap the shaft in a series of line contacts parallel to the axis of the shaft under a predetermined preload or tension.
		Thus, the preload of the foils and the bearing stiffness may be increased at startup, lifting the shaft away from the housing, and decreasing the eccentricity.
	www.freepatentsonline.com /4445792.html (2096 words)

	Foil air bearings cleared to land (Site not responding. Last check: 2007-10-09)
		The bearing surface is in contact with the shaft only when the machine starts and stops, and a coating on the foils limits wear at those times.
		In a journal bearing the shaft deflects and a wedge is formed due to the eccentricity between the shaft center and the bearing center.
		The foil face touching the shaft is coated for lubricity during startup and shutdown.
	www.memagazine.org /backissues/july98/features/foil/foil.html (2071 words)

	Drainage foil element having two wire bearing portions - Patent 4123322
		A drainage foil according to claim 1 wherein said drainage means comprises means defining a slot between said suction-creating portion and said second bearing portion, and beneath said slot, apertured means for holding said second bearing portion in a fixed position trailing said suction-creating portion.
		Foils currently in use have a sharp front edge, a flat leading or "land" surface for supporting or bearing the forming wire and a diverging trailing surface with divergence angle between 0.degree.
		The effective foil angle between the wire and the drainage surface is thus maintained more nearly constant during use of the foil and, in turn, this assures a greater degree of stability of the dewatering function in a paper making or other web-forming process.
	freepatentsonline.com /4123322.html (3536 words)

	Search Encyclopedia.com (Site not responding. Last check: 2007-10-09)
		There are two main kinds of bearings: the antifriction type, such as the roller bearing and the ball bearing, operating on the principle of rolling friction; and the plain, or sliding, type, such as the journal bearing a...
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	www.encyclopedia.com /searchpool.asp?target=Foil+bearing (575 words)

	R&D Dynamics Corporation
		The compliant foils are made of Inconel which conform to the shape of the mating rotating shaft.
		During lift-off, air is drawn between the shaft and the bearing and locally compressed.
		Similar to foil journal bearings, there are a pair of foil thrust bearings in the rotating machinery which support axial load.
	www.rddynamics.com /foil.html (311 words)

	Hydrodynamic fluid film thrust bearing - Patent 4462700
		A hydrodynamic fluid film thrust bearing including a stationary thrust plate 15, a rotating thrust runner 20 spaced therefrom, and at least one foil 50 disposed therebetween, is provided with first and second sets 25 and 45 of overlying resilient backing members in axial alignment with the foil.
		For example, where the bearing is employed in a 50,000-100,000 RPM turbo-compressor unit for an air cycle air conditioning system, foils 50 are on the order of 0.0127-0.01524 cm (0.005-0.006 in.) thick; separator plates 30 and 40 are each in the neighborhood of 0.0102-0.0127 cm (0.004-0.005 in.) thick.
		However, springs 25 lend the bearing sufficient compliance to accommodate movement of the separator plates for adequate damping of imbalances of the runner and accommodation of runner excursions under all loading, speed and operating conditions.
	www.freepatentsonline.com /4462700.html (1558 words)

	MiTi - Foil Bearing Example Applications - Compressor - Gas Turbine - Turbocharger - Motors
		Additionally, at maximum speed the journal bearings operate at 4.4 million DN (Diameter in mm times speed in rpm) which is well beyond the capability of any advanced oil lubricated rolling element or conventional gas lubricated bearings manufactured today.
		The breakthrough in foil bearing technology has become reality based upon the sustaining interest and support of our allies in government and industry who have seen the promise and potential offered by oil-free compliant foil gas bearings.
		The promise of foil bearings has always been in their design philosophy, namely to have a built-in ability to accommodate changing operating conditions, much like elements of the human anatomy.
	www.miti.cc /foil-bearings-applications.html (1225 words)

	Foil - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-09)
		Bruce foil, an foil used on an outrigger to prevent a boat from heeling
		foil (literature), a character who emphasizes the traits of a main character, by comparison or contrast
		Comedic foil, (or comic foil), is the straight man in a comedy team.
	en.wikipedia.org /wiki/Foil (182 words)

	NASA - NASA FactSheet
		Foil air bearings are self-acting hydrodynamic bearings that use ambient air as the lubricant instead of oil.
		For a foil air bearing, the maximum load capacity is dependent on the design of the top and bump foils, diameter, and length and speed of the rotating shaft.
		Foil bearings do not have this limitation as there are no rotating parts of the bearing except the shaft.
	www.nasa.gov /centers/glenn/about/fs14grc.html (1557 words)

	Advanced bearing system could cut engine costs, save fuel (Site not responding. Last check: 2007-10-09)
		An air foil bearing Mohawk Innovative Technology Inc., experts developed under an Air Force Small Business Innovation Research contract is being tested in a WJ24-8 target drone engine at Williams International, in Walled Lake, Mich. Tests are expected to be completed in June.
		The advanced bearings support an engine’s rotor on a hydrodynamic air film, eliminating the need for rolling element bearings and their associated liquid lubrication system, said Matt Wagner, the project’s manager and a mechanical engineer in the directorate’s turbine engine division.
		Foil air bearings have been around since the 1970s and used primarily in aircraft air cycle machines that circulate air through the cabin for environmental control.
	www.afmc.wpafb.af.mil /HQ-AFMC/PA/news/archive/2003/May/0519-03.htm (430 words)

	New bearing system could cut costs
		An air foil bearing developed by experts from Mohawk Innovative Technology Inc., is being tested in a target drone engine at Williams International, in Walled Lake, Mich. Tests are expected to be completed in June.
		The advanced bearings support an engine's rotor on an air film, eliminating the need for traditional bearings and their related lubrication system, said Matt Wagner, the project's manager and a mechanical engineer in the directorate's turbine engine division.
		Bearing lubrication systems in aerial targets or drones, and cruise missiles typically account for 10 to 30 percent of the engine cost and weight, as well as a large portion of maintenance Wagner said.
	globalsecurity.org /military/library/news/2003/05/mil-030520-afpn04.htm (418 words)

	B & C Engineering Associates, Inc. (Site not responding. Last check: 2007-10-09)
		A variety of bearing methodologies may be used without continuous lubrication supply, but the systems are too large, cumbersome and expensive (magnetic bearings) or incapable of carrying large loads at high temperatures and speeds (foil bearings).
		One segment of the five-pocket hydrostatic journal bearing with a wedge removed from the orifice, conus, and restrictor, as viewed from the conus side.
		One segment of the five-pocket hydrostatic thrust bearing with a wedge removed from the orifice, conus, and restrictor, as viewed from the conus side.
	www.bcea.com /rotating-bearings.html (617 words)

	MiTi - Foil Bearing - Oil-Free Bearing
		bearings, they perform well at very high speeds, require no lubrication, and can operate in process fluids from cryogenic temperatures to 650° C (1,200°F).
		compliant foil bearings feature innovative construction approaches, such as built-in variable stiffness characteristics and state-of-the-art, solid-film lubricant coatings.
		MiTi foil bearings ranging from 6 mm to over 150 mm in diameter have been designed, built and sucessfull demostrated in many applications.
	www.miti.cc /foil-bearings.html (173 words)

	OhioLINK ETD: Bruckner, Robert
		A foil bearing is a self acting hydrodynamic device capable of separating stationary and rotating components of rotating machinery by a film of air or other gaseous “lubricant”.
		The structural deformations of the bearing are modeled with a single partial differential equation.
		The equation models the top foil as a thin, bending dominated membrane whose deflections are governed by the biharmonic equation.
	www.ohiolink.edu /etd/view.cgi?acc_num=case1089304186 (384 words)

	High Voltage Device: Electrostatic Motor Plans
		The bottom must remain clear of foil, and no foil on these bottles should come close to touching the wooden base or close to any duct tape you might use to connect the stator bottles to the base.
		Don't let the silicone insulate the wire from the foil, because the stator foil and the commutator wire must both be electrically connected to one of the power supply terminals.
		The rotor's foil sectors are then repelled from the alike-charged stator bottle and attracted to the unlike charged stator bottle.
	www.eskimo.com /~billb/emotor/emot1.html (1872 words)

	NYSERDA - Transportation Programs - Design, Development & Manufacture of High-Speed Foil Bearings
		Bearing production volumes in the 100 to 300 units per year range dictated the use of low-volume manufacturing processes.
		The demand for high-quality compliant foil air bearings is also expected to increase.
		Project objective is to investigate and demonstrate cost-effective, high-volume production methods for compliant foil air bearings, and to establish and demonstrate a cost-effective, high-volume process for verifying assembled bearing quality.
	www.nyserda.org /programs/transportation/PowerSysProj_6465.asp (397 words)

	An Experimental Investigation into the Temperature Profile of a Compliant Foil Air Bearing - Storming Media
		The temperature profile was collected by instrumenting a foil bearing with nine, type K thermocouples arranged in the center and along the bearing's edges in order to measure local temperatures and estimate thermal gradients in the axial and circumferential directions.
		The mating journal was coated with a high temperature solid lubricant that, together with the bearing, underwent high temperature start-stop cycles to produce a smooth, steady-state mn-in surface.
		Surprisingly, the maximum temperatures did not occur at the bearing edge where the minimum film thickness is expected but rather in the middle of the bearing where analytical investigations have predicted the air film to be much thicker.
	www.stormingmedia.us /25/2576/A257624.html (340 words)

	Oil Free Turbine Engine Technology (Site not responding. Last check: 2007-10-09)
		Through research, analysis and testing in support of the project's primary focus, methods of implementing air foil bearings will be developed which will facilitate the use of these bearings in the commercial marketplace.
		This will be accomplished through foil bearing technology scale up from the newly demonstrated turbocharger application.
		Foil bearing load capacity and performance characteristics required for man rated small turbine engines will be developed and demonstrated.
	www.grc.nasa.gov /WWW/AERO/base/oftp.htm (423 words)

	The Effect of Journal Roughness and Foil Coatings on the Performance of Heavily Loaded Foil Air Bearings - Storming ...
		Two foil coating materials, a conventional soft polymer film (polyimide) and a hard ceramic (alumina), were independently evaluated against as-ground and worn (run-in) journals coated with NASA PS304, a high-temperature solid lubricant composite coating.
		The foil coatings were evaluated at journal rotational speeds of 30000 rpm and at 25 deg C. Tests were also performed on a foil bearing with a bare (uncoated) nickel-based superalloy top foil to establish a baseline for comparison.
		The test results indicate that the presence of a top foil solid lubricant coating is effective at increasing the load capacity performance of the foil bearing.
	www.stormingmedia.us /74/7452/A745293.html (301 words)

	First Oil-Free Turbine Aircraft Engine
		The bearings were subjected to test conditions representative of the engine core environment through a combination of high speeds, sustained loads, and elevated temperatures.
		This core bearing milestone is a first step toward a future version of the EJ-22 that will take advantage of recent advances in foil-air bearings by eliminating the need for oil lubrication systems and rolling element bearings.
		Although the project is still a couple of years from a full engine test of the bearings, this milestone shows that the bearing design exceeds the expected environment, thus providing confidence that an Oil-Free turbine aircraft engine will be attained.
	www.grc.nasa.gov /WWW/RT2001/2000/2200bream.html (319 words)

	Foster-Miller - Food - Nanotechnology Company specializing in System Design and Integration, Microelectronics, ...
		Foil bearings and an active magnetic thrust bearing for a direct-drive compressor.
		Two small bump preloaded foil bearings for a vertical cryogenic helium compressor.
		Prototype foil bearings for a miniature gas turbine engine used as an ultra-high-speed propulsion system for small ordnance.
	www.foster-miller.com /projectexamples/m_food/foil_bearings.htm (113 words)

	Title page for ETD etd-0410103-191114
		This thesis deals with the development of mathematical models and numerical schemes for simulating the hydrodynamic pressure and temperature rise of compliant foil bearings lubricated by a thin gas film in between its compliant bearing surface and the rotating shaft.
		The model accounts for the compressibility of gas, the compliance of the bearing surface, and the interaction between the pressure field and temperature field of the gas film in the bearing system.
		A series of parametric study is presented to illustrate the utility of the developed algorithms for characterization of foil bearing performance and guidance of foil bearing design.
	etd.lsu.edu /docs/available/etd-0410103-191114 (184 words)

	MiTi - Foil bearing - Oil-Free Bearing - Company Facility
		The company has thirty employees and numerous consultants, with extensive experience in research and development, foil bearing manufacturing and in transferring technology from concept to product.
		Manufacturing facilities exist for compliant surface gas bearings and seals, and magnetic bearings.
		has established a network of vendors capable of fabricating many of the individual elements that go into compliant foil seals, compliant foil bearings and magnetic bearings.
	www.miti.cc /facility.html (122 words)

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