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1、胼錐想翹但猿抿鐔蛾懣遜附錄衲爭戲灸從膿剎蜉獠回爆英語翻譯色覡豹縵衫齋扃迦底說匪LUBRICATIONANDJOURNALBEARINGS夼躺柒璽嚶秭寤耘剩丶淳1Introduction鎏博痙林讎鐲褰畏墩叨儻Abearingcanbedefinedasamemberspecificallydesignedtosupportmovingmachinecomponents.Themostcommonbearingapplicationisthesupportofarotatingshaftwhichistransmittingp
2、owerfromonelocationtoanother;oneexampleisthecrankshaftbearingsofautomaticengine;anotherexampleistheshaftbearingsusedalltypesofelectricmotors.Sincethereisalwaysrelativemotionbetweenabearinganditsmatingsurface,frictionisinvolved.Inmanyinstances,suchasthedesignofpull
3、eys,brakesandclutches,frictionisdesirable.However,inthecaseofbearings,thereductionoffrictionisoneofprimeconsiderations:frictionresultsinlossofpower,generationofheatandwearofmatingsurfaces.尚迮派絳遂海鑾雹蝮櫟冠Journalandantifrictionbearingsarethetwogeneraltypesofbearingsexis
4、tence.Journalbearingsoperatewithslidingcontact,whereasantifrictionbearingsexperiencepredominantlyrollingcontact.Theamountofslidingfrictioninjournalbearingsdependsonthesurfacefinishes,materials,slidingvelocitiesandthetypeoflubricantused.Theprinciplemotion-retarding
5、effectinantifrictionbearingsiscalledrollingresistanceratherthanrollingfriction.Thisissobecausetheresistanceofmotionisessentiallyduetothedeformationoftherollingelementsand,hence,itisnotaslidingphenomenon.Antifrictionbearingswillbeinchapter1.4.龍賡尼嘣鳴酞紈碟哨禿氳Toreducethe
6、problemsassociatedwithslidingfrictioninjournalbearings,alubricantisusedinconjunctionwithcompatiblematingmaterials.Whenselectingthelubricantandmatingmaterials,onemusttakeintoaccountbearingpressures,temperaturesandrubbingvelocities.Theprinciplefunctionofthelubricant
7、inslidingcontactbearingsistopreventphysicalcontactbetweentherubbingsurfaces.Thusthemaintenanceofanoilfilmundervaryingloads,speedsandtemperatureistheprimeconsiderationinslidingcontactbearings.抉饋咧管稟銀坤速柢拮陌2TheoryofFriction氨繰徂汪樵桌庵擒捷賃孤Frictionistheresistanceonepartexer
8、tsonasecondpartwhenrelativeslidingmotionoccursorisattempted.Thusfrictiontakesplacewhenevertwosurfacesrubtogether.Thecauseoffrictionistheinevitableinterl
