Active and inactive thrust bearings
Active and inactive thrust bearings
(OP)
Can anyone give me some information on active and inactive thrust bearings.I have heard about them but what are they used for?
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Active and inactive thrust bearings
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RE: Active and inactive thrust bearings
For example large vertical motor. Typically Kingsbury bearing is continuously carrying the weight and downthrust. It would be the active bearing.
During momentary upthrust, the rotor is free to move some distance at which point it is stopped by some other bearing. Sometimes this function is performed by movement of a lower ball bearing over a limited range. Sometimes a separate upthrust bearing above the upper bearing. Either way the thrust bearing taking momentary thrust would seem to be inactive thrust bearing.
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RE: Active and inactive thrust bearings
to static and dynamic.
Static means at rest or inactive
ie not rotating. Typical would
be a crane picking up a load and
not rotating or at rest. Dynamic
would be the load condition while
rotating.
RE: Active and inactive thrust bearings
On vertical motors many Hi thrust applications use a large bearing for down thrust (7320 and will use a smaller 7220 for the up thrust). The different sizing is used as the normal up thrust is momentary only and of less force.