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A thrust bearing is a particular type of rotary bearing
Bearing (mechanical)

A bearing is a device to allow constrained relative motion between two parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle....
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Self Aligning Roller Thrust Bearing Din728 Ex
Thrust Ball Bearing Din711 Ex
A thrust bearing is a particular type of rotary bearing
Bearing (mechanical)

A bearing is a device to allow constrained relative motion between two parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle....
. Like other rotary bearings they permit rotation between parts, but they are designed to support a high axial
Axial

Axial has different meanings:* In geometry, it means: along the same line as an axis of rotation or centerline: parallel , contrary to radial, perpendicular or tangential...
 load while doing this.

Thrust bearings come in several varieties.
  • Ball thrust bearings, composed of ball bearing
    Ball bearing

    A ball bearing is an engineering term referring to a type of rolling-element bearing which uses balls to maintain the separation between the moving parts of the bearing....
    s supported in a ring, can be used in low thrust applications where there is little radial
    Radial

    Radial can refer to:* Vector , a line* Radius, adjective form of* A radial pattern is one that appears to radiate from a point, like the spokes from the hub of a wheel...
     load.
  • Tapered roller bearing
    Tapered roller bearing

    Tapered roller bearings are bearings that can take large axial forces as well as being able to sustain large radial forces....
    s     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 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.
  • Fluid bearing
    Fluid bearing

    File:Hydrodynamic-Bearing-Demonstration-Rig-2003 01450.jpgFluid bearings are bearing which solely support the bearing's loads on a thin layer of liquid or gas....
    s     where the axial thrust is supported on a thin layer of pressurized liquid - these give low drag.


They are commonly used in automotive, marine, and aerospace applications.

Thrust bearings are used in cars because the forward gears in modern car gearboxes use helical gears which, while aiding in smoothness and noise reduction, cause axial forces that need to be dealt with. André Citroën
André Citroën

Andr?-Gustave Citro?n was a France entrepreneur of Jewish Netherlands and Poles descent. He is remembered chiefly for the make of car named after him, but also for his application of Gear#Double helical gears....
 invented a double helical gear which neutralized the thrust caused by normal helical gears.

One specific thrust bearing in an automobile is the clutch
Clutch

A clutch is a mechanism for transmitting rotation, which can be engaged and disengaged. Clutches are useful in devices that have two rotating shafts....
 'throw out' bearing, sometimes called the clutch release bearing.

Fluid-film thrust bearings were invented by Australian engineer George Michell
Anthony Michell

Anthony George Maldon Michell was an Australian mechanical engineer of the early 20th century....
 (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.

Michell's invention was notably applied to the thrust block
Thrust block

A thrust block is a specialised form of thrust bearing used in ships, to resist the thrust of the propellor shaft and transmit it to the hull....
 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
World War I

World War I, or the First World War , was a global military conflict which involved the Great powers, organized into two opposing military alliances: the Allies of World War I and the Central Powers....
, and have become the standard bearing used on turbine shafts in ships and power plants worldwide.

See also

  • Bearing (mechanical)
    Bearing (mechanical)

    A bearing is a device to allow constrained relative motion between two parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle....
  • Race (bearing)
    Race (bearing)

    The races of a rolling-element bearing are what the rolling-elements ride on. The large race that goes into a bore is called the outer race, and the small race that the shaft rides in is called the inner race....
  • Slewing bearing


External links

  • (Powerhouse Museum
    Powerhouse Museum

    The Powerhouse Museum is the major branch of the Museum of Applied Arts and Sciences in Sydney, the other being the historic Sydney Observatory....
     website)