Bearings In Mechanical Engineering

Bearing 

         It is a mechanical device by which loads are transmitted through contacting surfaces 

         It is desired to minimize friction and wear

         Lubricant – material between surfaces that reduces friction and wear

         Any moving part of the machine has to be supported by a relatively stationary part which can be called bearing.

Types of bearings

       1) Sliding bearings (bushing, journal, sleeve)

       2) Rolling element bearings

       3) Fluid bearings.

       4) Magnetic bearings.

 Lubricants

        Oil – heavy petroleum distillate, animal oils, vegetable oils plus additives

        Grease – Used as a barrier to dirt and debris.  No circulation, thus no cooling or cleaning.

        Solid – graphite, Teflon