資源描述：
《001 Machine Components Power Transmission Elements，14頁雙PPT，參考文獻(xiàn)價(jià)值英文文獻(xiàn)資料》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、MachineComponents:PowerTransmissionElementsME72EngineeringDesignLaboratoryPowerTransmissionDesignIssues?Powersource(motor,engine,etc.)?Powerrequired(P=torque′velocity)?ContinuousorIntermittentMotion?Operatingconditions(start,loadduration)?Magnitudeofspeed(inputo
2、routput)?Speedmodification(outputtoinput,constantorvariable,linearorrotary)1ConstantSpeedMechanicalTransmissionElements?Gears?Frictionwheels?PowerScrews?BeltsandChains?WireRope?Couplings?ClutchesandBrakes2RelativeShaftPositionRelativeSize3GearDesignIssues?Typeso
3、fGears:spur,helical,herringbone,internal,rack,bevel,andworm?AngularVelocityRatio(gearratio)?PowerRequirements(speedandtorque)?GearToothLoads?GearToothStresses4GearTerminology?PitchCircle(radiusordiameter)?CircularPitch?NumberofTeeth?PressureAngle?FaceWidth5SpurG
4、ears:ForceAnalysis?Wistheresultantforce?WtandWraretangentialandradialcomponents?disthepitchdiameter?fisthepressureangle?tistheappliedtorque2tWt=dWtW=cosfWWrt=tanfHelicalGears:ForceAnalysis?Wt,WrandWaaretangentialandradialandaxialcomponents?fnisthenormalpressurea
5、ngle?ftisthetangentpressureangle?yisthehelixangle2tWt=dWWrn==sinffWttantWWtn=cosfycosWWant==cosfysinWtany6BevelGears:ForceAnalysis?Wt,WrandWaaretangentialandradialandaxialcomponents?fisthepressureangle?gisthebevelangle?ravistheaveragepitchradiustWt=ravWWrt=tanco
6、sfgWWat=tansinfgWormGears:ForceAnalysis?Wt,WrandWaaretangentialandradialandaxialcomponents?fnisthenormalpressureangle?listhewormleadangle?dwormisthepitchdiameteroftheworm2tWt=dwormxWWW==tncosflsinyWWW==rnsinfzWWW==ancosflcos7StressesinGears:LewisFormulatMcWlt()2
7、6Wltsb==bt3=2Iwbt12w2tl=4x3W3WpWpttdtds===b2bx2bpxbYwwdw2pxdY==LewisFormFactor3StressesinGears:AGMAFormula?s=bendingstress?Assumptionsb?Wt=tangentialforce–Contactratiois1-2?p=pitchdiameterd–Nointerferenceor?bw=facewidthundercutting?J=geometryfactor–Nopointedteet
8、h?Ka=applicationfactor?Km=loaddistributionfactor–Nonzerobacklash?K=sizefactors–Standardrootfillets?Kv=dynamicfactor–FrictionneglectedWptdKKKamssb=bJwKv8PowerScrews?Co
