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ID:31018693
大小:71.50 KB
页数:5页
时间:2019-01-05
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1、外文原文GearsGearsarevitalfactorsinmachinery,whichareusestotransmitpowerormotionfromoneshafttoanother.Theymaybeusedonlytotransmitmotionfromonepartofamachinetoanother,ortheymaybeusedtochangethespeedorthetorqueofoneshaftwithwithrelationtoanother.Oneofthefirstme
2、chanisminvcntedusinggearswadtheclock.Infact,aclockislittlemorethanatrainofgears.Considerablestudyandresearchhavebeenmadeongearsinrecentyearsbecauseoftheirwideuseunderexactingconditions.Theyhavetotransmitheavierloadsandrunathighspeedsthaneverbefore-Theengi
3、neersandthemachinistsal1considergearingtheprimeelemcntinnearlyallclassesofmachinery.SuperGearsSpurgearswillbeconsideredfirstforseveralreasons.Inthefirstplace,theyaresimplestandtheleastexpensiveofgearsandtheymaybeusedtotransmitpowerbetweenparallelshafts,al
4、so,spurgearsdefinitionsarcusuallyapplicabletoothertypcs•Itisimportantgounderstandthefollowingdefinitions,sincetheyareimportantfactorsinthedesignofanyequipmentutilizinggears.DiametricPitchThenumberofteethperinchofpitchcirlediameter.Thediameterpitchisusuall
5、yaninteger.Asmallnumberforthepitchimpliesalargetoothsize.Meshingspurgearsmusthavethesamecliameterpitch.Thespeedratioisbasedonthefactthatmeshinggearsmayhavedifferent-sizedpitchcirclesandhencedifferentnumberofteeth.CircularPitchThedistanccfromapointononetoo
6、thtothecorrcspondingpointonanadjacenttooth,measruedalongthepitchcircle.Thisisalinerdimensionandthusbaslinerunits.PitchCircleThecircleonwhichthe:ratioofthegearsetisbased,whentwogearsaremeshing,thetwopitchcirclesmustbeexaetlytangcntifthegearsaretofunctionpr
7、operly.Thetangencypointisknownasthepitchpoint.PressureAngleTheanglebetweenthelineofactionandalineperpendiculartothecenterlinesofthetwogearsinmesing.PressureAnglesforspurgearsarcusually14.5or20degrees,althoughothervaluescanbeused.Meshinggearsmusthavethesam
8、epressureangles.Inthecaseofarack,theteethhavethestraightsidesinclinedatananglecorrespondingtothepressureangle.BaseCircleAcircletangenttothelineofaction(orpressureline).Thebasecircleistheimaginarycircleaboutwhichanin
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