Four kinds of popular types of mechanical bearings

Mechanical bearings are used in many assemblies, to provide improved linear or rotational movement. They are also effective in reducing the friction between the two parts, which means using less energy. The bearings are made of plastic or metal, often used in computers, refrigerators and cars and other everyday items.
There are several types of mechanical bearings, for each type of bearing is intended to work and subjected to different loads (radial or thrust) in specific applications. Just use the correct type of bearing to match the load, they are likely to last a long time.
The following are the four most popular types:
Plain
Bearing is the most basic type of bearing. Their construction is not the rolling elements, can only rely on the bearing surface to provide a smooth movement. Long life and simple design means this type, lowest cost, and can be easily applied to accept higher loads.
Rolling elements
Rolling may include Rolling and ball bearings. This relies on two bearing races or rings and to improve the movement or minimize sliding resistance. Is the most common type of ball bearing, thrust and radial load can withstand. However, when the load is small, they are the most popular applications. Rolling is preferred heavy load, because they use a cylinder having a larger contact area.
fluid
Fluid bearing rely on thin layer of liquid or gas to assist in supporting the load. They fall into two categories: hydrostatic bearings and hydrodynamic bearings. The hydrostatic type using air, water or oil, to facilitate smooth operation, and must be used with an external pump. Hydrodynamic lubrication generated by rotation to the wedge. They are preferably exceeds accuracy, high speed or high load capability application of standard ball bearings.
magnetic
The ability to use a magnetic field having a magnetic bearing without actual physical contact supports the rotating part. This type of setup required to maintain a constant power load stability. If the control system or power fails, the system needs to back-up bearing. They can be designed to achieve very predictable low friction, and does not require any lubricant to maintain a stable performance. This is a popular type of bearing used in industrial machinery (e.g. generators, motors and turbines).

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