325-lec-9-bearings (annotated)

325-lec-9-bearings (annotated) - MECH 325 Bushings...

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MECH 325 Bushings MECH 325 2 Objectives By the end of this section you should be able to: Identify types, uses, operating principles, and characteristics of journal bearings Select a boundary-lubricated bearing for a given application MECH 325 3 Hydrodynamic Bearings Rely on thick film of lubricant Advantages: Disadvantages: MECH 325 4 Hydrostatic Bearings Rely on pressurized fluid source Advantages: Disadvantages:
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MECH 325 5 Boundary-Lubricated Bearings Partial (or no) lubrication Advantages: Disadvantages: MECH 325 6 Boundary-Lubricated Bearings Operating considerations for boundary- lubricated bearings (bushings): Design considerations 12 (eq. 12-27) 720 (eq. 12-38) s f CR wf f K P V t fFN TT Jh L  max 4 FF PP D LD L  MECH 325 7 Bushing Operating Limits MECH 325 8 Bushing Selection Example A bushing of 1” diameter x 2” long is subject to a radial load of 225 lbf and rotates at 200 rev/min. The following factors are known or can be assumed: f 1 = 1.8 (see Table 12-10) ћ CR = 2.7 Btu/(hr ft 2 F) f 2 = 1.0 (see Table 12-11) J = 778 ft lbf/Btu f s = 0.03 Ambient temperature = 70 F Select a candidate material for this bushing.
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MECH 325 Rolling Element Bearings - Part 1 MECH 325 10 Objectives By the end of this section, you should be able to: Identify types, uses, and characteristics of rolling element bearings
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This note was uploaded on 02/01/2011 for the course MECH 325 taught by Professor Peteostafichuk during the Fall '10 term at The University of British Columbia.

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325-lec-9-bearings (annotated) - MECH 325 Bushings...

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