WHAT ARE BEARINGS?

Posted by Gillie
Aug 12 2011

WHAT ARE BEARINGS






Bearings are a special device to allow relative motion between two or more parts – typically rotating or linear movements and may generally be classified according to the movements they allow. Thus, there are many types of bearings, with varying shape, material, lubrication, principle of operation, and so on


 






















Plain bearings

use surfaces in rubbing contact, often with a


lubricant such as oil or graphite.  


Rolling-element bearings

use spheres or drums rolling between the parts to reduce friction; reduced friction


Jewel bearings

in which the load is carried by rolling the axle slightly off-center


Magnetic bearings

In which the load is carried by a magnetic field


Fluid bearings

Which solely support the bearing’s load on a thin layer of liquid or gas


Thrust bearing

Is a particular type of rotary bering that permits rotation between parts


 


 


Common motions permitted by bearings are:


·                    Axial rotation e.g. shaft rotation


·                    Linear motion e.g. drawer


·                    spherical rotation e.g. ball and socket joint


·                    hinge motion e.g. door, elbow, knee


 


Reducing friction in bearings is important to reduce wear and to facilitate extended use at high speeds and also to avoid overheating. A bearing can


reduce friction by virtue of its shape, material component (plastics that have low surface friction) or by introducing a fluid or electromagnetic field between surfaces.


 


Speeds


Plain bearings only handle lower speeds, rolling element bearings are faster, followed by fluid bearings and finally magnetic bearings which are limited by centripetal force overcoming material strength.


 


WHAT ARE BEARINGS 20110812414.0327 WHAT ARE BEARINGS?

Comments Off , Pings Off.

Comments are closed.