Bearings: definition of a hydrodynamic (full-film) lubricated journal bearing Identify the correct statement describing film formation and pressure generation in hydrodynamic lubrication. Choose the correct option.
Mechanical Engineering
Machine Design
Difficulty: Easy
Choose an option
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AThere is a thick (full) film of lubricant between journal and bearing
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BThere is only a thin boundary film between journal and bearing
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CThere is no lubricant between journal and bearing
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DLubricant is pressurised by an external pump to separate surfaces
Answer
Correct Answer: There is a thick (full) film of lubricant between journal and bearing
Explanation
ConceptHydrodynamic bearings develop a self-generated pressure in a full fluid film due to relative motion and wedge action, fully separating the surfaces. Option (d) describes hydrostatic lubrication (external pressurisation). Option (b) is boundary/mixed lubrication.
Final AnswerThere is a thick (full) film of lubricant between journal and bearing