Examine individual changes

[ 0 => '[[Image:Thrust-ball-bearing din711 ex.png|thumb|150px|A thrust ball bearing]]', 1 => false, 2 => 'A '''thrust bearing''' is a particular type of rotary [[rolling-element bearing]]. Like other bearings they permit rotation between parts, but they are designed to support a predominately [[Axis of rotation|axial]] load.', 3 => false, 4 => 'Thrust bearings come in several varieties. ', 5 => '*''Thrust ball bearings'', composed of [[ball bearing]]s supported in a ring, can be used in low thrust applications where there is little [[wikt:axial|axial]] load.', 6 => '*''Cylindrical thrust roller bearing''s consist of small cylindrical rollers arranged flat with their axes pointing to the axis of the bearing. They give very good carrying capacity and are cheap, but tend to wear due to the differences in radial speed and friction which is higher than with ball bearings.', 7 => '*''[[Tapered roller bearing|Tapered roller thrust bearings]]'' consist of small tapered rollers arranged so that their axes all converge at a point on the axis of the bearing. The length of the roller and the diameter of the wide and the narrow ends and the angle of rollers need to be carefully calculated to provide the correct taper so that each end of the roller rolls smoothly on the bearing face without skidding. These are the type most commonly used in automotive applications (to support the wheels of a motor car for example), where they are used in pairs to accommodate axial thrust in either direction, as well as radial loads. They can support rather larger thrust loads than the ball type due to the larger contact area, but are more expensive to manufacture.', 8 => false, 9 => '[[Image:Self-aligning-roller-thrust-bearing din728 ex.png|thumb|150px|A spherical roller thrust bearing]]', 10 => false, 11 => '*''[[Spherical roller thrust bearing]]s'' use asymmetrical rollers of spherical shape, rolling inside a house washer with a raceway with spherical inner shape. They can accommodate combined radial and axial loads and also accommodate misalignment of the shafts. They are often used together with radial [[spherical roller bearing]]s. Spherical roller thrust bearings offer the highest load rating density of all thrust bearings.<ref>{{cite web|title=Why SKF Spherical roller thrust bearings|url=http://www.skf.com/binary/12-101526/Why-SKF-sheet-for-SRTB---6548_EN.pdf|publisher=SKF|accessdate=17 December 2013}}</ref>', 12 => '*''[[Fluid bearing]]s'', where the axial thrust is supported on a thin layer of pressurized liquid—these give low drag.', 13 => '*''[[Magnetic bearing]]s'', where the axial thrust is supported on a magnetic field. This is used where very high speeds or very low drag is needed, for example the [[Zippe-type centrifuge]].', 14 => false, 15 => 'Thrust bearings are commonly used in automotive, marine, and aerospace applications. They are also used in the main and tail rotor blade grips of RC (radio controlled) helicopters.', 16 => false, 17 => 'Thrust bearings are used in cars because the forward gears in modern car [[gearbox]]es use [[helical gear]]s which, while aiding in smoothness and noise reduction, cause axial forces that need to be dealt with. The double helical or [[herringbone gear]] balances the thrust caused by normal helical gears.', 18 => false, 19 => 'One specific thrust bearing in an automobile is the [[clutch]] "throw out" bearing, sometimes called the ''clutch release bearing''.', 20 => false, 21 => '==Fluid film thrust bearings==', 22 => false, 23 => '[[File:Fluid thrust bearing.PNG|right|thumb|Exploded view of a Michell type thrust bearing. Note, each sector shaped pad can pivot on the ridges on the lower plate]]', 24 => 'Fluid-film thrust bearings were invented by Australian engineer [[Anthony Michell|George Michell]] (pronounced Mitchell) who patented his invention in 1905. Michell bearings contain a number of sector-shaped pads, arranged in a circle around the shaft, and which are free to pivot. These create wedge-shaped regions of oil inside the bearing between the pads and a rotating disk, which support the applied thrust and eliminate metal-on-metal contact.', 25 => false, 26 => 'Michell's invention was notably applied to the [[thrust block]] in ships. The small size (one-tenth the size of old bearing designs), low friction and long life of Michell's invention made possible the development of more powerful engines and propellers. They were used extensively in ships built during [[World War I]], and have become the standard bearing used on turbine shafts in ships and power plants worldwide. (See also [[Fluid bearing#Michell/Kingsbury tilting-pad fluid bearings|Michell/Kingsbury tilting-pad fluid bearings]])', 27 => false, 28 => '==See also==', 29 => '* [[Race (bearing)]]', 30 => '* [[Rolling-element bearing]]', 31 => '* [[Slewing bearing]]', 32 => false, 33 => '==External links==', 34 => '*[http://www.powerhousemuseum.com/australia_innovates/?behaviour=view_article&Section_id=1080&article_id=10086 The MichellThrust Bearing: a low-friction bearing for thrust shafts] ([[Powerhouse Museum]] website)', 35 => false, 36 => '==References==', 37 => '<References/>', 38 => false, 39 => '[[Category:Australian inventions]]', 40 => '[[Category:Bearings]]', 41 => false, 42 => '[[de:Lager (Maschinenelement)#Axiallager]]' ]