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thrust ball bearing

thrust bearing is a particular type of rotary bearing. Like other bearings they permit rotation between parts, but they are designed to support a predominantly axial load.

Thrust bearings come in several varieties.

  • Thrust ball bearings, composed of bearing balls supported in a ring, can be used in low thrust applications where there is little axial load.
  • Cylindrical thrust roller bearings 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.
  • 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 greater thrust loads than the ball type due to the larger contact area, but are more expensive to manufacture.

 

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Description

 

A spherical roller thrust bearing

  • Spherical roller thrust bearings 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 bearings. Spherical roller thrust bearings offer the highest load rating density of all thrust bearings.
  • Fluid bearings, where the axial thrust is supported on a thin layer of pressurized liquid—these give low drag.
  • Magnetic bearings, 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.

 

 

A thrust bearing is a particular type of rotary bearing. Like other rotary bearings they permit rotation between parts, but they are designed to support a high axial load while doing this (parallel to the shaft). Different kinds of thrust ball bearings are used to support different amounts of axial load. Thrust ball bearings are used in applications that use little axial load, where a ring supports ball bearings. Spherical roller thrust bearings are used in applications that require high axial load, and can also support shafts that are out of alignment. Thrust bearings are used in higher speed applications that require oil lubrication, such as in the automotive and aerospace industries.  Generally, thrust bearings are composed of two washers (raceways) in which those for ball bearings may be grooved, and the rolling elements.

thrust ball bearings  are manufactured

as single direction or double direction

thrust ball bearings They are designed

to accommodate axial loads only and must

not be subjected to any radial load

Bearing features

  • Separable and interchangeable

The separable components of  thrust

ball bearings are interchangeable

This facilitates mounting and dismounting,

and maintenance inspections

  • Initial misalignment

Bearings with sphered housing washer(s)

can accommodate initial

misalignment

  • Interference it

Shaft washers have a ground bore to enable

an interference it. The bore of the

housing washer is turned and always

larger than the shaft washer bore

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