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1、哈尔滨工业大学工学硕士学位论文AbstractThetoothprofileoftraditionalcycloidgearisformedbyacircularcycloidwiththeadvantagesoflargecontactratio,fewernumberofteethwithnoundercutting,lesswearanduniformwear,ontheincreasinglyurgentrequirementsofsmallsize,lightweight,highefficiencyinmodernproduction,thead
2、vantagesofcycloidgearisconcerned,andalsotheaccuracyrequirementsofcycloidgearcanbeeasilymetbytheraisinglevelofprocessing.However,thecycloidgeardoesnothavetheseparabilityasinvolutegear,andresearchesmentionedabovelaystressontheappropriateparametersselectingormethodofcirclecycloidsplic
3、ing,makingtheessenceisstillthetraditionalcycloidengagementandtheapplicationisgreatlylimited.Thetoothprofiledescribedinthisarticle,asiscallednewuniversalcycloidtoothprofile,isthedeformationoftraditionalcircularcycloidtoothprofile.Itremainstheadvantagesofcycloidgear,solvesthecenterli
4、nespacingproblemandincreasestoothstrength.Thistoothprofileisformedbythedeformationofhypocycloid,involuteanddeformationepicycloid,whoseconjugatetoothprofileisgeneratedbyprinciplesofgear.Theleastteethnumberofgearhasthistoothprofileis6,thismeetstheconditionsofthecontactratioandhasnoun
5、dercuttingandgreatlyreducesthevolumeofthegearandreducer.Comparedwithinvolutegear,thisnewuniversalcycloidgearhassmallanduniformslidingrate,biggercomprehensiveradiusofcurvatureandhigherstrengthoftoothcausedofthefigureoftoothprofile.Apairofmeshinggearsdegenerateintotraditionalcycloidg
6、earwhenthecenterlinespacingvariationiszero,otherwise,becamethenewuniversalcycloidgears.Amongthem,theclosedtoothprofilecannotbeusedingeneralgeartransmissionwhilethemoreeffectivetoothprofileformedbytheclosedtoothprofilecanmeettherequirementsofthecontactratiowithawiderrangeofapplicati
7、on.Inthispaper,expressionsofstraightcycloidinthecoordinatesystemofgearisgeneratedbycoordinatestransformation,meshingequationisestablishedbyenvelopmethodandrelativemotionmethod,geometricmodelofstraightcycloid’senvelope(thenewuniversalcycloid)isestablished,theundercuttingboundaryequa
8、tionsofstraightcycloidenve
