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Topic: Fluid bearing

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	Fluid bearing - Wikipedia, the free encyclopedia
		Fluid bearings, also called fluid dynamic bearings or hydrostatic or gas bearings, are bearings which support load on a thin layer of liquid or gas.
		Fluid bearings use a thin layer of liquid or gas fluid between the bearing faces, typically sealed around or under the rotating shaft.
		Ice skates are a hydrodynamic fluid bearing where the skate and ice are separated by a layer of water caused by entropy (formerly thought to be caused by pressure-induced melting; see ice skating for details).
	en.wikipedia.org /wiki/Fluid_bearing (1255 words)

	United States Patent Application: 0040090702
		The fluid dynamic bearing motor of claim 5, wherein the shaft is a separate element from the thrust plate, and the conical bearing is integrated with the shaft, and spaced from an end of the shaft coupled to the base plate.
		The fluid dynamic bearing motor of claim 1, wherein the stationary member comprises a shaft and the rotary member comprises a hub supported for rotation about the shaft, wherein the thrust bearing is defined between a surface of the hub and a surface of the thrust plate.
		Bearing grooves are formed on at least one of the surfaces defining the journal gap 526, and a fluid is retained therebetween in the gap 526.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040090702".PGNR.&OS=DN/20040090702&RS=DN/20040090702 (5823 words)

	Plain bearing - Wikipedia, the free encyclopedia
		Plain bearings are very widely used and appear in most kinds of equipment, notably as crankshaft and connecting rod bearings in automobile piston engines.
		Plain bearing may carry load in one of several ways depending on their operating conditions, load, relative surface speed (shaft to journal), clearance within the bearing, quality and quantity of lubricant and temperature (affecting lubricant viscocity).
		Dry and boundary conditions may be experienced even in a fluid bearing when operating outside of its normal operating conditions, i.e., at startup and shutdown.
	en.wikipedia.org /wiki/Plain_bearing (612 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		In rotary systems containing hydrodynamic bearings, the motion of the rotor itself draws the bearing fluid into the regions where the gap between the rotor and stator is the smallest and the friction therefore the greatest, and by drawing the fluid into these regions the bearing increases the pressure in these regions.
		A fluid jet 41 emerging from the source of pressurized fluid 31 enters the amplifier cavity 42 and is directed to one or the other of two opposing sides 43,44 of the cavity by a deflecting stream from one of the two pressure sensing channels 38,39.
		The jet from the pressurized fluid source 31 thus combines with the deflecting stream and the combined stream leaves the amplifier cavity by the bearing supply channel (33 or 34) on the side toward which the jet is deflected.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=05/17375.050224&ELEMENT_SET=DECL (3653 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		When the bearing surface 60 is rotated, in the direction 72, that is against the herringbone pattern, the grooves 62 and lands 64 tend to draw lubricant from the inner and outer radii 66 and 68 towards the points of the pattern at 70.
		A fluid dynamic bearing arrangement according to claim 3 wherein the thrust bearing pattern is chosen from a group comprising a chevron pattern or an outward spiral.
		A fluid dynamic bearing arrangement as claimed in claim 12 wherein the thrust bearing means, comprises an off-axis surface defined on the thrust element and a facing surface on the sleeve.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/94164.031113&ELEMENT_SET=DECL (4344 words)

	Nelson Air - Air Bearing Primer
		Fluid film bearings have no solid-to-solid contact under typical running conditions; instead, a film of lubricating fluid (in our case pressurized air) forms a layer between the solid machine elements and serves to transfer forces from one to the other.
		The fluid is able to transfer forces because as the fluid is pushed through the bearing gap it generates a pressure profile across the bearing area.
		What this means for air bearings is that although they have a lower load capacity, gas bearings have essentially zero friction at all speeds and because the tight bearing clearances demand high accuracy components this results in extremely high accuracy motion.
	nelsonair.com /NA_primer.htm (2219 words)

	Zero static-friction actuator pivot bearing for production disk drives (US6315452)
		The motor-driven hydrodynamic pumping element is disposed coaxially to the zero static-friction hydrostatic bearing element in a single assembly adapted for use as an actuator pivot bearing.
		The fluid bearing layers are coupled to form a continuous pressure-controlled fluid film sealed at three ends by surface tension.
		In an actuator pivot bearing for a disk drive data storage apparatus, the hydrodynamic pump motor can be operated under the control of a dual phase-locked motor drive controller to synchronize it with a spindle motor element in a manner that cancels vibrations arising from both motors.
	www.delphion.com /details?pn=US06315452__ (484 words)

	ServoFluid Control Bearing
		Bearings that are intentionally operated with partial lubrication at very low pressures - just enough to move the lubricant through the bearing's supply, cooling, and filtration system with adequate flow.
		Bearing stiffness and damping can be pre-selected and independently adjusted to best support an application and to address rotor-related malfunctions that may be of concern.
		A pressurized bearing is a stiffer bearing one with extremely high load density properties, allowing an entirely new generation of machines to be developed with shorter rotors, smaller bearings, and the reduction or even elimination of seals.
	www.oilandgasonline.com /Content/ProductShowcase/product.asp?DocID={701048B3-57E8-11D4-8C55-009027DE0829}&VNETCOOKIE=NO (1066 words)

	Bearings and Seals
		Experimental measurement of fluid film bearing coefficients continues with the investigation of bearing coefficients as a function of bearing load angle.
		The bearing coefficients for a five pad, rocker-back pivot type with a preload of 0.3 were measured at various load angles from load on pad to load between pad.
		The 3-D fluid flow code TASC flow, by AEA, is being used to evaluate details of the flow and improve the computer code.
	www.virginia.edu /romac/bearings_and_seals.htm (704 words)

	Dynamic pressure type fluid bearing apparatus - Patent 5141338
		Another object of the present invention is to provide a dynamic pressure type fluid bearing device requiring no vents, having a shaft in which the radius of the bottom end surface as equal to that of the top end surface, which is easy to produce, and well-resistant to wear.
		The thrust bearing 4 is riveted to the sleeve 2 by a riveting portion 2C and the sleeve 2 is closely attached to the thrust bearing 4.
		The thrust bearing 4 consists of titanium carbide or partly stabilized zirconia (PSZ) and its surface roughness is as precise as 0.3 microns or less.
	www.freepatentsonline.com /5141338.html (3679 words)

	Modern Machine Shop: Making profilers more productive - Rapid Traverse - Ingersoll Milling Machine's new High Velocity ... (Site not responding. Last check: 2007-10-08)
		Also, since the fluid bearing is externally pressurized, the spindle can run over the entire speed range (0 to 100 percent) without loss of bearing stiffness.
		The dynamic stiffness of the fluid bearing spindle is 5-6 times greater than that of mechanical bearing spindles, which makes possible significantly higher metal removal rates.
		Fluid bearing spindles are free of the vibration created by conventional ball bearing spindles.
	www.findarticles.com /p/articles/mi_m3101/is_1_75/ai_87148998 (780 words)

	Seagate Technology Media Coverage Fluid bearings needed to spur disk drive progress (Site not responding. Last check: 2007-10-08)
		The hard-disk drive industry must move to a new type of spindle motor bearing if it is to continue to increase areal densities and data rates at the pace the market demands.
		In fluid-dynamic bearings, the bearing function is taken over by a layer of lubricant less than one-tenth the thickness of a human hair.
		Fluid-dynamic bearings require only one-third as many parts as ball bearings, so they have the potential to be produced less expensively.
	seagate.com /cda/newsinfo/newsroom/coverage/article/1,1113,1095,00.html (367 words)

	Expert in: Tribology, Film Bearings, Including Very Large Hydroturbine Thrust and Guide Bearings (Site not responding. Last check: 2007-10-08)
		His expertise is in sliding surface bearings, which includes hydrodynamic and hydrostatic lubrication, tribology disciplines such as friction and wear, and bearing materials and lubricants.
		He is an authority on various designs of fluid film thrust and journal bearings that are basically the fixed geometry and tilting-pad types.
		In addition, his expertise includes the hydrostatic bearing "lift" system to develop an oil film separation at startup and shutdown, during which the hydrodynamic film is not sufficiently developed.
	www.intota.com /viewbio.asp?bioID=603778&perID=107575 (545 words)

	Help are fluid bearings causing NO OS PROBLEM!? - Discussion@SR (Site not responding. Last check: 2007-10-08)
		Fluid bearings have mass produced and used in any environment whether that be enterprise, home, or mobile.
		But personally, if the bearing did cause the rotational errors that you speak of, then i think that all the data on the hdd should be considered not reliable.
		Fluid bearings are not my area of expertise, but IIRC it's possible to have air bubbles trapped in the fluid during the manufacturing process.
	forums.storagereview.net /index.php?act=ST&f=2&t=18373 (3400 words)

	Bearing Report for TSU 2-m Telescope (Site not responding. Last check: 2007-10-08)
		Hydrostatic bearings consist of a pair of machined surfaces between which a fluid is pumped.
		There are basically two types of hydrostatic bearings, based on the type of fluid used, liquid- and gas-lubricated bearings, but the equations used to describe them are exactly the same.
		Similarly, if the bearing is loaded more heavily, the oil gap is squeezed thinner, reducing the flow, and thus giving a lower pressure drop in the regulator and a higher recess pressure in the bearing.
	astro.tsuniv.edu /eng_t13_brngrep.html (2712 words)

	Fluid Film Bearing Code Development
		This is particularly important for cryogenic fluids because their properties are sensitive to temperature as well as pressure.
		Because cryogens are semicompressible fluids and the bearing dynamic characteristics are highly sensitive to fluid compressibility, fluid compressibility effects are also modeled.
		Under the direction of the Air Force, Texas AandM is conducting bearing tests using a mixture of water and gaseous nitrogen to verify the code for fluid compressibility effects.
	www.grc.nasa.gov /WWW/RT1995/5000/5310wl.htm (687 words)

	Application Note - Predictive Maintenance through the Monitoring and Diagnostics of Rolling Element Bearings (Site not responding. Last check: 2007-10-08)
		The construction of a fluid film bearing is such that the shaft is supported by a fluid film during operation.
		A classical characteristic of rolling element bearings is the generation of specific vibration frequencies based on the bearing geometry, number of rolling elements and the speed at which the bearing is rotating (Appendix A).
		For a rolling element bearing, it is suggested to be within 1 to 2 inches (25 to 50 mm) from the bearing.
	www.bently.com /articles/apnotes/an044.asp (2912 words)

	Seagate Technology News Release Seagate Forms Strategic Partnerships to Manufacture Fluid Dynamic Bearing Motors for ... (Site not responding. Last check: 2007-10-08)
		Fluid dynamic bearing motors utilize a viscous oil or air rather than metal ball bearings, and are superior to conventional ball-bearing motors in several distinct ways:
		In a fluid dynamic bearing motor, the working parts of the motor are separated by a film of oil, which acts like a shock absorber and prevents damage to the bearing surfaces.
		Dampening in bearings is important for a disc drive to correctly write to or retrieve the data from the disc.
	www.seagate.com /cda/newsinfo/newsroom/releases/article/0,1121,105^4^1,00.html (835 words)

	3D - Fluid-Film Bearing Performance Presentation (Site not responding. Last check: 2007-10-08)
		For illustration, below are selected graphic screens of various types of geometries analyzed with the fluid-film bearing modules implemented in the ARMD software package.
		4 pad canted lobe journal bearing operating at 6,000 rpm for a compressor system in a steel plant.
		5 inch diameter tilting pad journal bearing operating at 1800 rpm for a compressor application.
	www.rbts.com /ffbrg_sam.en.shtml (82 words)

	Bently Pressurized Bearing Company - Founder
		Today, he is actively pioneering fully lubricated, pressurized bearing technology – technology destined to be as influential as the proximity probe in revolutionizing rotating machinery.
		The text explains the use of modern root locus methodology and dynamic stiffness measurements for rotor stability analysis and includes a chapter on the control of fluid induced instability using externally pressurized bearing technology.
		The bearing can use compressible and incompressible fluids for lubricants, and is applicable to radial, thrust, and combination radial/thrust applications.
	www.bpb-co.com /corporate/founder.php (1933 words)

	Kingsbury, Inc. - Babbitted fluid film thrust and journal bearings for rotating machinery.
		Since Dr. Albert Kingsbury invented the tilting-pad thrust bearing in 1912, Kingsbury, Inc. has remained the technological leader in babbitted fluid film thrust and journal bearings for all types of rotating machinery.
		In addition to its standard line of equalizing hydrodynamic bearings, Kingsbury offers an advanced Leading Edge Groove (LEG®) lubrication technology to dramatically improve bearing performance and reduce operating costs.
		Bearing innovation, unequaled engineering capabilities and superior aftermarket services, including a dedicated repair and service facility, all add up to Kingsbury being "The Best Support In The Business".
	www.kingsbury.com (130 words)

	MEEN 334 - MECHANICAL SYSTEMS I
		Catalog Course Description: Development of Reynolds Equation from Navier Stokes equations for study of hydrodynamic lubrication theory as the basis for bearing design; applications to simple thrust and journal bearings and pads of various geometries; hydrostatic lubrication, floating ring bearings, compressible fluid (gas) lubrication, grease lubrication, dynamically loaded bearings, half speed whirl and stability.
		The class material emphasizes the understanding of physical principles and the effects of fluid film bearings on the dynamics of rotating machinery.
		Evaluation of dynamic force coefficients in finite length bearings using a perturbation of the flow equations.
	phn.tamu.edu /me626 (1102 words)

	Maxtor's Fluid Dynamic bearing drives - TechIMO Forums
		The Quantum drives with the fluid bearings tested out faster than any other in my stable so far and I have several mfg's of drives.
		The fluid bearing drives though, with acoustic managment disabled (fastest seeks) are still quieter than the ball bearings drive with it enabled to max.
		Theoretically, the fluid bearings ought to be a whole lot quieter, and I'm looking into that sorta drive for my studio machines.
	www.techimo.com /forum/showthread.php?t=23060 (964 words)

	SPCR :: View topic - Vertical vs. horizontal - what bearings work when?
		I have also read that in general, fans with sleeve bearings work better/last longer when the fan is mounted so that the fan shaft is horizontal - like a case fan mounted on the back of a case, fer instance.
		Sleeve bearing fans typically work fine for at least 2 years, and they are rather inexpensive to replace.
		Even with the shaft mounted horizontally, a fan bearing is still obviously subjected thrust because of the pull of the fan blade.
	forums.silentpcreview.com /viewtopic.php?p=95469 (3256 words)

	Case Western Reserve University
		A set of class notes which cover all the material discussed is included in the price of the workshop along with an extensive section of references and related material.
		He specializes in failure analysis and has over 30 years of experience as a university professor, an engineer in industry and a private consulting practice with an emphasis on the applied aspects of this science.
		This applied aspect involves failure analysis, design of hydrodynamic bearings, connecting rod bearings, rolling element bearings, as well as the design of mechanical components involving friction, lubrication, and wear.
	ecivwww.cwru.edu /civil/conted/hydro.html (700 words)

	Rensselaer Polytechnic Institute
		Project Description: Deep in the Earth, fluid-assisted geochemical transport is controlled mainly by: 1) the solubilities of rock components in the fluid of interest; 2) the diffusion characteristics of the dissolved solutes; and 3) the permeability of the rock to fluid flow.
		In the permeability study, the piston-cylinder apparatus is used to fabricate metal-jacketed "rock" samples exhibiting near-equilibrium microstructure in the presence of aqueous fluid.
		After recovery from the piston-cylinder apparatus, the samples are mounted for permeability characterization at room conditions using conventional gas-flow techniques.
	www.er.doe.gov /bes/geo/Publications/FY97Summ/rpi.htm (569 words)

	Diff between WD JD + PD Hdd's - Short-Media Forums
		The fluid dynamic bearing drives are also sold under the name "Quiet Drive technology," because they are.
		So, to answer your question, the JD drives have the ball bearing while the PD drives have the fluid dynamic bearing.
		The fluid dynamic bearing is really, really quiet (I sometimes have to put my ear against it to find out if it's spinning), while the ball bearing is typically fairly quiet though some drives are quieter than others.
	www.short-media.com /forum/showthread.php?t=18076 (309 words)

	BYTE.com
		In a nutshell, using fluid dynamic bearing motors results in drives that are quieter, use less power, and perform better than existing drives with ball-bearing motors.
		Though fluid dynamic bearing motors offer significant advances in shock and acoustics, vibration, and fati gue life (number of hours before metal fatigue sets in and causes bearings to fail), Seagate has managed to keep the cost down to around the same as ball-bearing motors.
		In hard drives that use fluid dynamic bearing motors (like some Seagate models), the piece parts inside the motor form air gaps that are filled with viscous oil; this oil can withstand temperature changes far greater than what traditional ball-bearing drives can withstand.
	www.byte.com /art/9802/sec9/art3.htm (524 words)

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