机械制造 毕业设计 外文英文文献 翻译 齿轮和齿轮传动

《机械制造 毕业设计 外文英文文献 翻译 齿轮和齿轮传动》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、机械制造毕业设计外文英文文献翻译齿轮和齿轮传动Gearsandgeardrive　　　Gearsarethemostdurableandruggedofallmechanicaldrives.Theycantransmithighpoweratefficienciesupto98%andwithlongservicelives.Forthisreason,gearsratherthanbeltsorchainsarefoundinautomotivetransmissionsandmostheavy-dutymachinedrives.

2、Ontheotherhand,gearsaremoreexpensivethanotherdrives,especiallyiftheyaremachinedandnotmadefrompowermetalorplastic.　　　Gearcostincreasessharplywithdemandsforhighprecisionandaccuracy.Soitisimportanttoestablishtolerancerequirementsappropriatefortheapplication.Gearsthattransmi

3、theavyloadsorthanoperateathighspeedsarenotparticularlyexpensive,butgearsthatmustdobotharecostly.　　　Silentgearsalsoareexpensive.Instrumentandcomputergearstendtobecostlybecausespeedordisplacementratiosmustbeexact.Attheotherextreme,gearsoperatingatlowspeedinexposedlocations

4、arenormallytermednocriticalandaremadetominimumqualitystandards.　　　Fortoothforms,size,andquality,industrialpracticeistofollowstandardssetupbytheAmericanGearManufacturesAssociationAGMA.Toothform　　　StandardspublishedbyAGMAestablishgearproportionsandtoothprofiles.Toothgeomet

5、ryisdeterminedprimarilybypitch,depth,andpressureangle.　　　Pitch：StandardspitchesareusuallywholenumberswhenmeasuredasdiametralpitchP.Coarse-pitchgearinghasteethlargerthan20diametralpitch?usually0.5to19.99.Fine-pitchgearingusuallyhasteethofdiametralpitch20to200.　　　Depth:Sta

6、ndardizedintermsofpitch.Standardfull-depthhaveworkingdepthof2/p.Iftheteethhaveequaladdendaasinstandardinterchangeablegearstheaddendumis1/p.Stubteethhaveaworkingdepthusually20%lessthanfull-depthteeth.Full-depthteethhavealargercontractratiothanstubteeth.Gearswithsmallnumbe

7、rsofteethmayhaveundercutsothantheydonotinterferewithoneanotherduringengagement.Undercuttingreduceactiveprofileandweakensthetooth.　　　Matinggearswithlongandshortaddendumhavelargerload-carryingcapacitythanstandardgears.Theaddendumofthesmallergearpinionisincreasedwhilethatof

8、largergearisdecreased,leavingthewholedepththesame.Thisformisknowasrecess-actiongearing.　　　PressureAngle