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200693793,,,,,1302R,::S219103213:ADesignofHydromechanicalDoublePowerDifferentialSteeringMechanismforTrackedTractorCaoFuyi1ZhouZhili2JiaHongshe3(1.Xi’anUniversityofTechnology2.He’nanUniversityofScienceandTechnology3.YituoGroupCooperation)AbstractBasedondoublepowertransmissiontheoryandusingsteplessspeedchangeperformanceofhydrauliccomponents,thesteeringtheoryofhydromechanicaldoublepowerdifferentialsteeringmechanismadaptingtothetrackedvehicleisanalyzed.Therunningformulaandtorqueformulaareestablished.Theprinciplefordeterminingthecharacteristicparameterofplanetarygeartrainisputforward.Onthebasisofthecalculationformulaofthemainparametersofhydraulicsteer2ingspeedchangesystem,theparameterdesignandsteeringperformanceanalysisofDong2fanghong1302Rrubbertrackedtractorhavebeencompleted.Allperformancesofthetractorcanbeachieved.KeywordsTractor,Hydromechanicaldoublepowerdifferentialsteeringmechanism,De2sign:200503283(:0121001400),710048,471003,471003,[1],[15],1302R,,,,,11,,,,,,,,,,,,,,,,,1Fig.1Transmissionprincipleschemeofhydromechanicaldoublepowerdifferentialsteeringmechanism1.2.3.4.5.6.7.8.,,,,,,2,211nL=An0izif+nyiy(1+A)imnR=An0izif-nyiy(1+A)im(1)A(),n0nyiziyifim,,2,O1O1O(),,2Fig.2Changingcurveofrotatingspeedofdrivingwheelwiththatofmotoratonegear(1)2,,,3[6],,(1)if=2A1+An0nL+nR1izimny=1+A2(nL-nR)imiy(2)(2),62006,(),,212[7]MqL=(1+A)(Mb+AMm)2AimMqR=(1+A)(Mb-AMm)2Aim(3)Mb,NmMm,NmML=B(1+A)2rkMmimiy(4)B,mrk,m(4),,,213(1),()Aö(1+A),,(3)(4),,,1302R,11515kmöh,(),39144918kNm111962141,Zq=55,Zt=23,A=21391,214,,1Tab.1ParametersofhydraulicpumpandmotoröLr-101055örmin-1500örmin-13900örmin-14250öLr-101055ökW187örmin-13900örmin-14250öMPa42öMPa48515öNm24121411,[7]ny=AB2Riyifizn0(5)R,m(5),,,n0ö(ifiz),,(),R3B4[8],[7]qm=6128Mm10-3Gympm1iy(6)pm,Pa,qm,LörGym21412qp=AB2Rn0npqmGvpGvm(7)GvpGvmnp,römin214131302R79:(2300römin,215,1128,61091,11435m,01346m),,38MPa,,(6),(7),(5),,V9055,1,1302R3311,vl=vL+vR2=2PrkimAn0(1+A)izif(8)2,(8)2,,,,,3122Tab.2Averagerunningspeedandthesmallestturningradiusofthetractor123456123.5002.3892.0501.8331.4800.8763.5612.420vlökmh-13.975.826.787.589.3915.853.905.74Rminöm0.841.231.431.601.993.350.831.21(5)R=ABn02nyiyifiz(9)(9),,22,11R3B4,2,43,;,,,1.[M].:,1998:351417.2YasuoKita,Kyoto,HiroyukiFujii,etal.Hydromechanicaltransmissionandhydromechanicalspeed2changemecha2nism:US,4776233[P].19881011.3Chambers,RobertO,Hanson,etal.Infinitelyvariabletransmission:US,3897697[P].19780209.4.[D].:,1999.5.[D].:,2000.6JungHyeonKim,KyeongUkKim,WuYonggen.Analysisoftransmissionloadofagriculturaltractors[J].JournalofTerramechanics,2000,37(3):113125.7.[D].:,2003.8,.[J].,1991,8(7):712.82006