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Topic: Bearing (mechanical)

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  Bearing (mechanical) - Wikipedia, the free encyclopedia
Bearings may be classified broadly according to the motions they allow and according to their principle of operation.
A rotary bearing or thrust bearing allows motion about a center, such as a wheel on a shaft or a shaft through a housing.
The first practical caged-roller bearing was invented in the mid-1740s by horologist John Harrison for his H3 marine timekeeper.
en.wikipedia.org /wiki/Bearing_(mechanical)   (985 words)

 COBRA Roller Bearing Software. J.V. Poplawski & Associates: consulting mechanical engineers - bearing & finite element ...   (Site not responding. Last check: 2007-11-02)
Bearing models include high-speed ball, cylindrical roller and tapered roller bearings.
Bearing fit-up analysis is performed using classical thick ring press fit theory as well as a seamless interface to ANSYS FEA models of the bearing row that are automatically constructed and analyzed with results returned to COBRA.
Individual bearing temperature models are in the process of being completed for estimating inner and outer race operating temperatures using the pre described ANSYS models.
www.bearingspecialists.com /software.asp   (448 words)

 Ball Bearings, Mechanical Assemblies, Miniature Precision Radial
Miniature bearings and instrument bearings are typically available in both stainless steel for those applications requiring corrosion resistance and chrome for maximum fatigue life.
NMB radial bearings are used in aircraft components, such as wing flaps, engine and wing mounts and hatches, and rod-ends.
Many of these mechanical assemblies are found in office automation, including integral bearings for use in rigid disk drive spindles, and as part of printers, fax machines and copiers.
www.nmbtech.com /miniature_precision_ball_bearings_assemblies.htm   (575 words)

 Maintenance knowledge: Bearing mounting - Mechanical bearing mounting
Mounting force can be applied to the bearing by placing a fitting tool impact ring and sleeve against the inner ring and using a press or hammer to advance the bearing to its proper location on the shaft.
When bearings are mounted cold, care must be taken to ensure that the drive-up forces are applied to the ring with the interference fit.
Method: Correct adjustment of spherical roller bearings is determined by measuring the residual internal clearance in the bearing or by the amount of axial drive-up.
www.mapro.skf.com /knowledge/knw_mechmnt.htm   (520 words)

 Fluid bearing - Wikipedia, the free encyclopedia
Fluid bearings are bearings which solely support the bearing's loads 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/Air_bearing   (1274 words)

 NSK Bearings Ball Cylindrical Angular Contact Tapered Roller Spherical Thrust Needle Deep Groove Sealed RHP Self Lube ...
RHP Bearings (Ransom, Hoffman and Pollard) was formed in 1969 as a result of the merger of three of the UK's leading bearing manufacturers.
NSK Bearing Units consist of a sealed single row ball bearing with spherical outside diameter and extended inner ring mounted in a pillow block or flanged housing.
RHP Silver Lube Bearings offer a range of corrosion resistant ball bearing units specifically designed for use in industries where frequent washdowns are necessary, optimum hygiene standards are required and good chemical resistance is important.
www.bearingplace.com /manufactures/nsk.html   (496 words)

 Bearings - Bearings Mechanical
A rotary bearing allows motion about a center, such as a wheel on a shaft or a shaft through a housing.
An early example of a wooden ball bearing (see rolling-element bearing), supporting a rotating table, was retrieved from the remains of a Roman Republic ship in Lake Nemi, Italy.
Bearings excludes all liability of any kind (including negligence) in respect of any third party information or other material made available on, or which can be accessed using, this Website.
www.bearings-qed.com   (1155 words)

 Feature - The Fluid Transition
Hybrid ball bearings used in the high-end milling spindles in service today appear to represent the practical limit of how much speed and power a mechanical bearing can put to use and still maintain a long service life.
Accuracy in a ball bearing is affected by the stack-up of mechanical tolerances.
For example, part of the difficulty of servicing a mechanical bearing is the lubrication system that forms a critical and complex connection between stationary and rotating parts.
www.mmsonline.com /articles/040104.html   (1779 words)

 Mechanical engineering other topics - New type of bearing?   (Site not responding. Last check: 2007-11-02)
When a bearing fails, it is typically evidenced by a leaking seal (stand alone).
Bearing failure will typically not destroy seal faces unless it is catastrophic, or is allowed to continue to the point that bearing seats are damaged, which will almost always lead to seal face damage.
If the bearing itself is the seal housing, it is safe to assume that the simple removal of the bearing is all that is required to replace the seal material.
www.eng-tips.com /viewthread.cfm?qid=60820   (3190 words)

 Bearing User Guide   (Site not responding. Last check: 2007-11-02)
Pumps are also a major user of polymer lined bearings with oil lubrication and ceramic bearings for lubrication by contaminated process fluids.
High speed compressors with flexible shafts can be very demanding of journal bearings in terms of their required dynamic properties; 4 or 5 pad tilting pad journal bearings are commonly used.
Depending on size and whether vertical or horizontal orientation, generators use the full range of WBC mechanical bearing designs, as internal bearings or in complete assemblies; fixed profile or tilting pad radial and tilting pad thrust for vertical machines.
www.waukbearing.com /bearing_user_guide   (981 words)

 Galibier Design - Bearing
The belt pulls at a point midway between the bearing journals (the contact surfaces of the bearing).
This geometry confers dynamic stability to the bearing and platter which is experienced as pitch stability in the music.
The massive bearing housing and large sump capacity (8.5cc) further minimizes stress on the oil.
www.galibierdesign.com /prd_bearing.html   (735 words)

 Stereophile: Immedia RPM-2 tonearm
An arm's bearing system must be loose enough to allow the stylus unimpeded movement in both vertical and horizontal dimensions, yet rigid enough to prevent the forces unleashed by this violent mechanical interface from tossing the arm around—the "tail wagging the dog" effect.
Various combinations of mass, mechanical stiffness, and damping are used in all tonearms to rid the systems of unwanted energy, either by absorbing (damping) it and turning it into heat, or by evacuating it via a path to "ground," where it is again turned into heat.
Installing the arm atop the bearing post is complicated somewhat by the Discovery wiring harness—one continuous length running from the cartridge pins to the RCA plugs.
www.stereophile.com /analogsourcereviews/597immedia   (1077 words)

 Aerotech| Air Bearings wide bearing spacing
This design, in addition to the large air-bearing surface that distributes the load over a large surface area, results in a stage with outstanding stiffness that is ideal for heavy or offset loading.
Our totally noncontact air bearing, noncontact linear motor drive, and noncontact feedback device ensure years of maintenance-free operation at the high performance levels that are expected of Aerotech equipment.
Because there is no mechanical contact between moving elements, the ABL8000 experiences no wear or reduction in performance over time.
www.aerotech.com /products/airbearing/abl8000.html   (340 words)

 www.davidson.com.au - UE Systems Ultrasonic Detection Applications
Inspection of mechanical equipment with ultrasonic instruments such as the Ultraprobe has many advantages.
Ultrasound inspection provides early warning of bearing failure, detects lack of lubrication, prevents over lubrication and can be used on high as well as low speed bearings.
Once a series of bearings have been tested, and a base line set, data is recorded and then compared to future readings for historical trending and analysis.
www.davidson.com.au /products/ultrasonics/ue/application/bearing-inspection.asp   (354 words)

 Ultraprobe Ultrasonic Detection Applications
In addition, since ultrasound is a high frequency, short wave signal, it is possible to filter out stray, confusing background noises and focus on the specific item to be inspected.
In order to trouble shoot bearings or to establish a baseline, it is necessary to compare similar bearings for potential differences in amplitude and sound quality.
To do this, make a permanent reference point on a bearing housing or use the grease fitting, tune to 30 kHz and adjust the sensitivity to read the intensity/decibel level on the display panel.
www.uesystems.com /why_up_apps_mechanical.asp   (481 words)

 Basics of Design Engineering - Mechanical - Bearings - Bearing Lubrication   (Site not responding. Last check: 2007-11-02)
Most bearings operate with a fluid film -- oil, another liquid, or a gas.
Or the bearing can be made of a porous metal impregnated with oil that "bleeds" to the bearing surface as the shaft rotates.
Hinge bearings in aircraft landing gears, for example, do not move fast enough to develop hydrodynamic films, yet hydrostatic systems would be too heavy, costly, and cumbersome.
www.machinedesign.com /BDE/mechanical/bdemech6/bdemech6_16.html   (501 words)

 Magnetic-Bearing Momentum Wheel, AMSAT Phase 3-D Satellite
Moreover, the 2 DOF actively controlled bearing allows a high momentum-to-mass ratio of the wheel as parts of the bearing contribute to the momentum storage capacity.
This is done by lowering the flux density in the narrow gap to 0.54 T (at 180 degrees) and increasing the flux density in the wide gap to 0.87 T (at 0 degrees) by sending current to generate a magneto-inductive force of 2400 AW through the coils.
The magnetic bearing coils were designed for high efficiency and thus their time constant is long compared to the characteristic frequency omega_o of the loop.
www.amsat.org /amsat/sats/phase3d/wheels/index.html   (3181 words)

If the remaining two bearings can't be matched to the new bearing two new bearings must be installed and the other two put into the supply room to be referenced against the next bearing failure.
I think the outer bearing could be a standard radial needle bearing with one thicker, say.062 layer of perhaps fiber reinforced rubber around it (such as found in reinforced rubber hose) pressed into the block.
Elastomeric bearings are bearings and are susceptible to failure although the failure manifests itself in different ways as opposed to a metal bearing.
www.synchrolite.com /0798.html   (4421 words)

 Penn State Outreach News   (Site not responding. Last check: 2007-11-02)
Bearings are one of the most basic components of any mechanical system: without them nothing moves.
Even so, most undergraduate mechanical engineering students receive only one week of formal instruction on ball and roller bearings.
This one-week program was a crash course in bearing technology and set the groundwork for those involved in the industry to further their own efforts.
www.outreach.psu.edu /News/magazine/Vol_4.3/bearing.html   (749 words)

 Bearing - Wikipedia, the free encyclopedia
bearing is the state of having something as a quality, characteristic, or permanent attribute.
A bearing (mechanical) is a component that separates moving parts.
In mechanics a bearing component is one that takes a load.
en.wikipedia.org /wiki/Bearing   (106 words)

 Caliper drive for a bicycle ball bearing mechanical disc brake caliper (US6527089)
A caliper drive for a bicycle ball bearing mechanical disc brake caliper includes a first cam fixed against axial movement relative to an advancement axis during caliper actuation and a second cam moveably axially of the advancement axis relative to the fixed cam during caliper actuation.
Each ramped groove has a side wall defining a radially stable path for the ball bearing substantially preventing relative radial movement between the fixed and drive cams.
A caliper drive for a bicycle ball bearing mechanical disc brake caliper, the caliper drive moving an associated brake pad along an advancement axis relative to a brake disc operatively associated with ball bearing mechanical disc brake caliper during caliper actuation, the caliper drive comprising;
www.delphion.com /details?pn=US06527089__   (389 words)

 Bearing Engineers, Inc. About Us
Founded in 1956, Bearing Engineers has always brought the latest technologies to the marketplace.
Through the years, customers have come to count on us for honest, practical answers and the most cost-effective solutions to their electro-mechanical needs.
As specialists in high-tech markets such as semiconductor fabrication equipment, medical equipment, aerospace, and robotics, we provide a multitude of components, both mechanical and electrical, to address all your motion control needs.
www.bearingengineers.com /about.html   (211 words)

 Bearing design, manufacture and maintenance - Reliability of oil mist lubrication   (Site not responding. Last check: 2007-11-02)
The direct cause is the failure of the pump mechanical seal which cause the crude oil to leak.
The fire is caused by the hot crude oil (140 C) leaking from the damaged mechanical seal, not the oil mist itself.
What I am saying is that poor oil mist distribution may cause failure of pump bearing which then induce a seal failure, and let crude oil leak to the air.
www.eng-tips.com /viewthread.cfm?qid=61225   (618 words)

 Mechanical Seal Stir Bearing CG-2007-M
Our NEW mechanical seal bearing is the only design on the market that will permit you to use your current glass, metal or Teflon covered stir shaft.
The design allows you to have the flexibility of vertical adjustment and still choose your agitator diameter and style.
Bearing has a ferrule and locking nut to ensure that the seal rotates properly, and is supplied complete with a gold plated wrench.
www.chemglass.com /products_new/np-mechsealstirbearing.htm   (156 words)

 Bearing & Transmission, Industrial Distribution of Bearings and Power Transmission Components
We now span from Winnipeg, Manitoba to Campbell River, B.C. With our 27 service centres and a central distribution centre, our inventories of bearings, mechanical power transmission components and specialty products are close to all of our western Canadian customers.
As the first member of the Dynavest family of businesses, Bearing and Transmission proudly became a member of the Applied group of companies.
Additionally, we now are able to draw on a much larger inventory of products and services to satisfy all of our customers, large and small.
www.bandt.com /about.html   (307 words)

 Roller bearing - Mechanical Design Guidelines for Bearings (via CobWeb/3.1 planetlab2.cs.unc.edu)   (Site not responding. Last check: 2007-11-02)
Roller bearings are used in rotary applications to replace sliding movement with low friction,
Definition: A bearing made up of hardened inner and outer races between which hardened steel rollers move.
Introduction to linear crossed roller bearings which have higher load capacity resulting from the line contact between each roller and the raceway.
ucla.siteslinks.com.cob-web.org:8888 /sil/ucla-roller-bearing.htm   (251 words)

 Cerbec | ceramic industrial bearing balls | mechanical (via CobWeb/3.1 planetlab2.cs.unc.edu)   (Site not responding. Last check: 2007-11-02)
CERBEC balls are lighter, stiffer, smoother, harder, corrosion resistant, require less lubrication and have lower thermal expansion than their steel counterparts which allow the bearing to run at higher speeds, higher operational temperatures with less lubrication.
To minimize the problem, special coatings can be applied to the outer race, however the process is time-consuming, costly and not perfectly reliable.
A better solution is the use of CERBEC ceramic balls which provide electrical insulation,increased bearing performance, and reliability.
www.cerbec.com.cob-web.org:8888 /Application/Mechanical.asp   (182 words)

 J.V. Poplawski & Associates: consulting mechanical engineers - bearing & finite element analysis specialists   (Site not responding. Last check: 2007-11-02)
Head of the Applied Mechanics Group - supervised engineers, technicians and programmers in the development and application of analytical models and finite element techniques to analyze equipment and process design problems on steel mill, marine, and mining equipment.
Supervisor - Bearing and Seal Research Group - responsible for theoretical work and research programs on high-speed ball bearings, roller bearings and mainshaft seals for small gas turbine engines.
Authored and Presented over 25 technical papers on mathematical modeling and analysis regarding rolling bearings and steel rolling process models given at national and international conferences.
www.bearingspecialists.com /resumejp.asp   (571 words)

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