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Hydrodynamic lubrication, most generally, requires a threshold velocity differential between the journal and the bearing. This velocity differential is established and maintained by the rotational speed of the journal. In the case where rotation oscillates back and forth as with a piston wrist pin, hydrodynamic lubrication is dependent upon squeeze time and not velocity. Velocity is important as it relates to distance traveled but not for sustaining hydrodynamic lubrication.

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