2011InternationalConferenceonElectronic&MechanicalEngineeringandInformationTechnologyCompensationofVariablePitchRollerChainsforthePolygonEffectWeihuaLiuYubinGaoCollegeofCommunicationandInformationTechnologyCollegeofCommunicationandInformationTechnologyNorthUniversityofChina,NorthUniversityofChina,Taiyuan030051,ChinaTaiyuan030051,Chinalwh20081506@163.comybgao@nuc.edu.cnAbstract—Thispapercarriesoutadetailedresearchontheapplicationperformanceandthepolygoneffectofchaintransmission.Thispapermainlyadoptsthefollowingmethodstorealizethecompensationofpolygoneffect:byuseofvariablepitchrollerchains,thechaincenterlineiskeptattheminimumintercrosspositionwiththesprocketpitchcircle.Thus,thepolygoneffectofchaintransmissionunderconstraintsiseffectivelyimproved,andthetransversevibrationofthechaincenterlineduringthetransmissionprocesshasbeenweakenedandeased.Keywords—ChainTransmission;VariablePitch;Polygon-effect;PitchCircle.■I.INTRODUCTIONChaintransmissionisakindofgeartransmissionbetweentwoormorethantwosprocketsandchainsaretheflexibledraw-offdevices.BecauseofitseconomyandItcanbeseeninFigure1:whenthechainislocatedinreliability,itiswidelyusedinvariousmechanicalpower"b",theverticalvelocityofthechainiszero,whichmeanstransmissionslikeinagricultureandmining,metallurgy,thattheamplitudeoftransversevibrationistheminimum;transportationandetc.Butthepolygonaleffectofchainwhenitislocatedin"a/c",theverticalvelocityofthetransmissionwillcausetransversevibrationinthechainisthemaximum,namely,theamplitudeoftransversetransmissionprocess.Thetransversevibrationwillcausevibrationisthemaximum.FigureIdshowsthatunderslippagephenomenonandheavydynamicloads,aggravategeneralconditionsinmeshingprocess,accordingtothethewearofchainhingeandthejitterofchainedges,andgeometricalanalysisandresultantvelocitydecomposition,reducetheefficiencyofchaintransmission,whichhasgreatwhentheactivewheelturnsOC(thesmallsprocketisthedamagetothechains.Forthisreason,thispaperwillactivewheel),thespeedofth