Hydrodynamic Lubrication

Posted by: Cragyon ® Administrator 07/23/2003, 12:38:36

I came accross the term "Hydrodynamic Lubrication" while sizing a bearing journal for a bell crank. What does "Hydrodynamic Lubrication" mean?

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Re: Hydrodynamic Lubrication
Re: -- Cragyon		Top of thread

Posted by: ReubenAG ® 10/12/2003, 16:44:27

Hydrodynamic lubrication implies there is a (comparatively)thick film of fluid between the moving surfaces, so no contact occcurs between the surfaces. It requires that there be sufficient speed differential between the surfaces, which causes the formation of the "oil wedge". The "wedge" of lubrication is called that because when hydrodynamic lubrication happens, the shaft will always sit eccentrically in the bearing, even if only by a few microns, so the radial clearance starts large and gets progressively smaller. Hydrodynamic lubrication doesn't need an oil pump or pressurised lubricant source to happen, but will be reached if a shaft spins fast enough in a bearing supplied with sufficient lubricant flow.

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Re: Hydrodynamic Lubrication
Re: Hydrodynamic Lubrication -- Cragyon		Top of thread

Posted by: vishwanath ® 09/30/2003, 08:09:32

hi,  Can u please provide me Concept and some details about Hydrodynamic Lubrication for my seminar topic.. vishu

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Re: Hydrodynamic Lubrication
Re: -- vishwanath		Top of thread

Posted by: hnic ® 11/07/2003, 20:39:58

Cragyon An example of Hydrodynamic Lubrication is your car engine. In this case it needs an oil pump and the oil pressure forms a wedge that lifts the crankshaft. For more information you  could look at automotive mechanics training material. Cheers

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