introduction to manual transmissions & transaxles=za predmetot prenosnici=odlicnoooooooooooooooooooo外语英文电子书

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1、Section1IntroductiontoManualTransmissions&TransaxlesLearningObjectives:1.Identifythepurposeandoperationoftransmissions.2.Describetorqueandtorquemultiplication.3.Determinegearratios.4.Identifyspurandhelicalgears,anddescribethedifferencebetweenthetwo.ManualTransmissions&Trans

2、axles-Course3021-1Section1Section1IntroductiontoManualTransmissions&TransaxlesDrivetrainEnergyproducedintheengineistransmittedtothedrivewheelsthroughthedrivetrain.Thecomponentsthatmakeupthedrivetraininclude:aclutchmechanism,transmission,propellershaft,differentialandaxles.T

3、hedrivetrainallowsthedrivertocontrolpowerflowusingenginetorqueandallowsthevehicletomovefromastoptocruisingspeedwhilemaintainingenginespeedwithinit'smostefficientpowerband.Adrivetraincantransmitenginepowertotherearwheels,frontwheelsorallfourwheels.Whenthedrivetraindeliverspo

4、wertotherearwheels,itisreferredtoasfrontenginereardrive(FR);whenitdeliverspowertothefrontwheels,frontenginefrontdrive(FF);andwhenitdeliverspowertoallwheels,fourwheeldrive(4WD).FrontEngineRearDrive(FR)DrivetrainAfrontenginereardrive(FR)drivetraindeliverspowerfromafrontmounte

5、denginethroughthetransmissionandreardifferentialtotherearwheels.FrontEngineFrontDrive(FF)DrivetrainAfrontenginefrontdrive(FR)drivetraindeliverspowerfromafrontenginethroughthetransaxleanddifferentialtothefrontwheels.(Thisconfigurationisessentiallythesameforarearmountedengine

6、withrearwheeldriver)1-2TOYOTATechnicalTrainingIntroductiontoManualTransmissions&TransaxlesFourWheelDrive(4WD)DrivetrainAfourwheeldrive(4WD)drivetraindeliverspowerfromafrontmountedenginethrougheitheratransaxletothefrontwheelsandatransferandareardifferentialtotherearwheels;or

7、throughatransmissiontothereardifferentialandrearwheels,andatransfertoafrontdifferentialandfrontwheels.TorqueRotatingmechanicalpowerproducedbythedrivetrainiscalledtorque.Torqueismeasuredinfoot-poundsofforce(ft-lbf)orinNewton-meters(N·m).Toenableanautomobiletomove,thedriveaxl

8、eappliestorquetothewheelsandtirestomakethemrotate.Thetransmissionanddriveaxlegearr