汽车专业英语(幻灯片)chapter 4 braking system

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1、Energyisrequiredwhenavehicleisacceleratedfromresttoacertainspeed.Aproportionofthatenergyisnowstoredinthevehicleandiscalledkineticenergy.Inordertoreducethespeedofthevehicle,thebrakeshavetoconvertthekineticenergytoheatenergy;thespeedofconversiongovernstherateatwhichthevehicleslowsdown.汽车从原地起步加速到某一速

2、度需要能量。储存在汽车中的那部分能量称为动能。要降低车速,制动器必须把汽车的动能转换为热能；转换的速度决定了汽车减速的快慢。Review1:What’sthemainfunctionofbrakingsystem?1.discbrake2.brakecaliper3.brakehose4.brakepedal5.mastercylinder6.wheelcylinder7.drumbrakeReview2:Listthemainpartsofbrakingsystem.Review2:Listthemainpartsofbrakingsystem.1、Energy-supplyingde

3、vice供能装置2、Controldevice控制装置3、Transmissiondevice传能装置4、Brake制动器MeteringValve节压阀ProportioningValve比例阀CheckValve单向阀SolenoidValve电磁阀CombinationValve组合阀DelayValve延迟阀ModulatorValve调节阀AccordingtofunctionAccordingtothetypesofenergyusedReview3:Whichtypesdothebrakingsystemhave?servicebrakingsystemparkingbr

4、akingsystemadditionalretardingbrakingsystemsecondary(emergency)brakingsystemmuscularenergybrakingsystem(non-powerbrakingsystem)energyassistedbrakingsystem(powerassistedbrakingsystem)non-muscularenergybrakingsystem(powerbrakingsystem)inertialbrakingsystemgravitybrakingsystemThethreetypesofbrak

5、ingsystemsareinusetoday:servicebrakingsystem,parkingbrakingsystemandadditionalretarding-brakingsystem.Theservicebrakingsystemandtheparkingbrakingsystemhaveseparatecontrolandtransmissiondevices.Theservicebrakingsystemisnormallyfoot-operated,whiletheparkingbrakingsystemishand-operated.目前使用的制动系统有三种类

6、型：行车制动系，住车制动系和辅助制动系．行车制动系和住车制动系有独立的控制和传动装置．行车制动系通常使用脚刹，而驻车制动系通常使用手刹．AccordingtoenergytransmissionAccordingtocircuitReview3:Whichtypesdothebrakingsystemhave?single-circuitbrakingsystemmulti-circuitbrakingsystemmechanicalbrakingsystemhydraulicbrakingsystempneumaticbrakingsystemelectromagneticbra

7、kingsystemcombinationbrakingsystemTwotypesofbrakesareusedinmoderncars:drumbrakesanddiscbrakes.Since1976,allcarshaveuseddiscbrakesonthefrontwheels.Mostcarsusedrumbrakesontherearwheels.Inbothdrumanddiscbrakes,ahydraulics