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UD MEEG 304 - Bearings

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OutlineBearingsComparing Rolling to JournalPowerPoint PresentationRolling Element BearingsBall BearingsRoller BearingsRolling Element ComparisonsRolling Element AnalysisSlide 10Slide 11Bearing Selection, P 10-26,27OutlineHydrodynamic/Journal/Sleeve BearingsRolling-Element Bearingstypesselection of roller bearingsBearingsall bearings are of course only necessary evils, contributing nothing to the product or function of the machine; and any virtues they can have are only of a negative order. Their merits consist in absorbing as little power as possible, wearing out as slowly as possible, occupying as little space as possible, and costing as little as possible(Michell, 1929)Comparing Rolling to JournalRolling Bearing are better because:low starting and good operating frictionradial and thrust loadsno self-excited instabilitiesless space axiallycan seal lubricant in bearingJournal Bearings are better because:fatigue failure not a problemless space radiallyless noisemore tolerant to misalignmentless expensive, except for oiling systemless operating frictiondeep groove ballfull journalpg. 654 in NortonReprinted From: "Design Data" Teague & Dunn, Machine Elements See http://www.engineersedge.com/bearing_application.htmRolling Element BearingsBall Bearingsgood for smaller sizes, lighter loadsRoller Bearingsgood for larger sizes, heavier loadshandle shock and impact loading wellPlainTaperedSphericalRolling Element ComparisonsFigure 10-21, Pg. 658 in NortonRolling Element AnalysisLoad RatingCalculate Plookup C, C0 in tablecalculate for a specific number of cyclesRating Life, L10life at which 10% of bearings have failedin millions of revolutions or in hoursEquivalent load for combined conditionsneeded when axial and thrust loads are presentVariable loadingBearing Selection, P 10-26,27Get tangential load on Gear 2 from equal & opposite torquesGet radial loads using radial load factorGet bearing reactions in x-dir from gear loads in x-z plane onlyGet bearing reactions in y-dir from gear loads in y-z plane onlyGet total vector load at each bearing (sqrt of sum of squares)Calculate needed minimum C, use Fig


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UD MEEG 304 - Bearings

Documents in this Course
Agenda

Agenda

9 pages

Bearings

Bearings

12 pages

Fatigue

Fatigue

8 pages

Concept

Concept

3 pages

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