Boundary Lubrication (sometimes referred to as thin film lubrication) is a condition in which the lubricant film becomes too thin to provide total separation. This may be due to excessive loading, speeds or a change in the fluid's characteristics. In such a situation, contact between surface asperities (peaks and valleys) occurs. Friction reduction and wear protection is then provided through chemical compounds rather than properties of the lubricating fluid. Boundary lubrication often occurs during the start-up and shutdown of equipment or when loading becomes excessive. This condition can commonly be observed in certain types of gear sets that need to withstand sliding pressures and shock loading such as hypoid gear sets found in automotive differentials.
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John Howard Dismant has written: 'Dislocation theory applied to friction and boundary lubrication' -- subject(s): Tribology, Mechanical wear, Friction
under conditions of heavy load and low speed a thick film of lubricant cannot work ,under these conditions,boundary lubrication occurs.in other words ,this type of lubrication cannot persist ,and metal metal direct contact is possible for some reasons.such a situation develops when 1)the viscosity of oil is low 2)the load is fairly high 3)the viscosity of oil is low 4)a shaft starts moving from rest
lubrication lubrication
Mist lubrication system is that, in which the lubrication of a bearing is done by the oil in the form of oil mist.
Mist lubrication system is that, in which the lubrication of a bearing is done by the oil in the form of oil mist.
KY Jelly can be used as a lubrication, and is available at drug stores.
The difference is that hydrodynamic lubrication requires the motion of the moving parts that are to be lubricated to pump the actual lubricant. Electrohydrodynamic lubrication involves electrically charged lubricants.
As a "train", there is no typical lubrication system, as it is not necessary. Individual components have grease systems and locomotive components include multiple lubrication systems. So, there is no single invention of a train lubrication system.
No lubrication is necessary under normal use.
To provide a film of lubrication between metal moving parts.
lubrication