同济大学：《汽车构造》课程电子教案（课件讲稿）Chapter 13 传动系统 Overview of automobile drivetrain

Chap13 Overview of automobile drivetrain 窗月桥大学 TONGII UNIVERSTTY Chapter 13 Drivetrain

Chap13 Overview of automobile drivetrain Chapter13 Drivetrain

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY Thinking about... >Components of typical mechanical drivetrain? >Basic functions of the drivetrain? >Sorts of the drivetrain? >Layout types of drivetrain？And the characteristics?

Chap13 Overview of automobile drivetrain Components of typical mechanical drivetrain？ Basic functions of the drivetrain？ Sorts of the drivetrain？ Layout types of drivetrain ？ And the characteristics？ Thinking about…

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTT I Components and Functions of drivetrain Basic functions of the drivetrain >The system conveys the engine power to the road wheels,enabling cars to run normally in a variety of driving conditions,with a good fuel economy and driving performance

Chap13 Overview of automobile drivetrain ⅠComponents and Functions of drivetrain Basic functions of the drivetrain The system conveys the engine power to the road wheels, enabling cars to run normally in a variety of driving conditions, with a good fuel economy and driving performance

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY I Components and Functions of drivetrain Components of mechanical drivetrain Driving w universal joint clutch,transmission 2 transaxle differential axle shaft engine propeller shaft final drive Driving w

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain Components of mechanical drivetrain Front engine Driving wheel Driving wheel clutch transmissionuniversal joint transaxle differential axle shaft final drive propeller shaft

Chap13 Overview of automobile drivetrain 圖月儕大学 TONGII UNIVERSTTY I Components and Functions of drivetrain Functions of drivetrain >To reduce speed and increase torque >To change speed of automobile >To drive backwards >To interrupt power of drivetrain >To enable driving wheels on both sides to run at different speeds

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain Functions of drivetrain To reduce speed and increase torque To change speed of automobile To drive backwards To interrupt power of drivetrain To enable driving wheels on both sides to run at different speeds

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY I Components and Functions of drivetrain (1) 齿轮 >6100-Qen decreases to 5 >When runni need to overco >6100-Qen to the drive wl 传动轴 >With drivet of engine,ac 主动齿轮 engine torque。 It is done by clutch and final drive

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain （1）To reduce speed and increase torque 6100—Q engine reaches 3000r/min at maximum power，the speed decreases to 510km/h when connected to driving wheels directly； When running on straight asphalt roads at a low even speed, cars need to overcome rolling resistance of 1.5% of total vehicle gravity； 6100—Q engine’s maximum torque is 353N·m, If directly transmitted to the drive wheels, driving force is only 784N。 With drivetrain，driving wheel speed decreases to a fraction of that of engine，accordingly, the driving torque increases to several times the engine torque。 It is done by clutch and final drive

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY I Components and Functions of drivetrain (2)To change speed >vehicle speed oad grade、 road conditions、 n)varies in a large range; >Narrow is cran engine power and lower fuel co >To keep engi nable driving force and speed n ratio should vary from the n >It is done by tra

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain （2）To change speed vehicle speed restricted by conditions (load quality、road grade、 road conditions、road width、traffic conditions and so on) varies in a large range； Narrow is crankshaft speed range which enables bigger engine power and lower fuel consumption rate。 To keep engine working in good speed range，and enable driving force and speed to vary in a wide range，the transmission ratio should vary from the minimum to the maximum。 It is done by transmission

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY I Components and Functions of drivetrain (3)To drive backwards 第一轴 第一轴 倒档轴 第二轴 第二轴 前进档 倒档 前进档与倒档的对比 >There is reverse gear with intermediate reduction gear pair in the transmission

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain （3）To drive backwards Automobiles need to run backwards in some conditions； The combustion engine can not be reversed. The drivetrain should enable driving wheels to reverse with the constant engine rotation. There is reverse gear with intermediate reduction gear pair in the transmission

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY I Components and Functions of drivetrain (4)To interrupt power of drivetrain >The engine c 离合器壳 then it must be maintained 分离套简和分 离轴承总成 le is started, driving routes 飞轮 pe cut off, that is the inte 从动盘 >Interrupt po 压盘、 >Interrupt po (内)钢丝 支承翻 离合器工 作缸总成 膜片弹簧 >It is done by (外)铜丝 支承圈 离合器盖 铆钉

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain The engine can only be started at loadless condition，and then it must be maintained at the minimum stable speed, so before vehicle is started， driving routes between the engine and drive wheels must be cut off， that is the interruption fuction； Interrupt power when shifting； Interrupt power before vehicle braking。 It is done by transmission （4）To interrupt power of drivetrain

Chap13 Overview of automobile drivetrain 同©大学 TONGII UNIVERSTTY I Components and Functions of drivetrain (5)To enable driving wheels on both sides to have different speeds 高从环齿轮阅 传动轴 侧齿轮 行星齿轮 行星齿轮轴 差速器构造图

Chap13 Overview of automobile drivetrain Ⅰ Components and Functions of drivetrain When vehicles turn，left and right wheels roll a different distance, the function of differential can make left and right driving wheels rotate with different angular velocity. It is done by differential。 （5）To enable driving wheels on both sides to have different speeds