JN2070越野四驱货车气压制动系统设计说明书

JN2070越野四驱货车气压制动系统设计学生姓名：陈棋指导老师：程峰浙江科技学院机械学院摘要汽车作为陆地上的现代重要交通工具，由许多保证其性能的大部件，即所谓“总成”组成，制动系就是其中一个重要的总成，它直接影响汽车的安全性。随着高速公路的快速发展和车流密度的日益增大，交通事故也不断增加。据有关资料介绍，在由于车辆本身的问题而造成的交通事故中，制动系统故障引起的事故为总数的45%。可见，制动系统是保证行车安全的极为重要的一个系统。此外，制动系统的好坏还直接影响车辆的平均车速和车辆的运输效率，也就是保证运输经济效益的重要因素。制动系统既可以使行驶中的汽车减速，又可保证停车后的汽车能驻留原地不动。由此可见，汽车制动系统对于汽车行驶的安全性，停车的可靠性和运输经济效益起着重要的保证作用。当今，随着高速公路网的不断扩展、汽车车速的提高以及车流密度的增大，对汽车制动系的工作可靠性要求显得日益重要。只有制动性能良好和制动系工作可靠的汽车才能充分发挥出其高速行驶的动力性能并保证行驶的安全性。由此可见，制动系是汽车非常重要的组成部分，从而对汽车制动系的机构分析与设计计算也就显得非常重要了。本论文是设计JN2070越野四驱货车的制动系统，采用的是气压驱动机构的凸轮式鼓式制动器。为了安全考虑制动系统的气压回路采用双回路。关键词：气压制动制动性传动装置TheDesignofAirBrakeSystemaboutJN2070off-roadfour-wheeldrivetruckStudent:QiChenAdvisor:Dr.FengChengSchoolofMechanicalandAutomotiveEngineeringZhejiangUniversityofScienceandTechnologyAbstractAsanimportantmodernland-basedtransport,Automotivecomponentsfrommanylargeparts,namely,theso-calledassemblywhichensuretheperformanceofautomotive,andbrakingsystemwhichdirectlyaffectsthesafetyofmotorvehiclesisoneofthemostimportantassembly.Withtherapiddevelopmentofhighwaysandincreasedtrafficdensity,trafficaccidentsarealsoincreasing.Accordingtotheinformationonthevehicleitselfasaresultofproblemscausedbytrafficaccidents,thebrakesystemfailurecausedtheaccidentaccountingforthetotalnumberof45%.Sobrakingsystemisanextremelyimportantsystemtoensuretrafficsafety.Inaddition,thebrakingsystemhasadirectimpactonthequalityoftheaveragevehiclespeedandvehicletransportationefficiency,thatis,animportantfactorensuringcost-effectivetransport.Itnotonlycanslowdownamovingvehicle,butalsotoensurethatthecarcanbefixedinsituafterparking.Thisshowsthatthevehiclebrakingsystemplaysanimportantroleintrafficsafety,thereliabilityofparking,andtransporteconomicefficiency.Today,withever-expandinghighwaynetwork,theimprovementofvehiclespeedandtrafficdensity,ontheworkofautomotivebrakingsystemreliabecomeincreasinglyimportant.Onlyvehicleswhichhavegoodbrakingperformanceandreliablebrakingsystemcangivefullplaytotheirhigh-speeddynamicperformanceandtoensurethesafetyoftraveling.Thisshowsthatthebrakingsystemisaveryimportantcomponentofthevehicle,thusit’sveryimportanttotheanalysisanddesignofbrakesystembodies.bilityrequirementsKeywords:airbrakeBrakeTransmissiondevice目录摘要........................................................................................................................1Abstract..........................................................................................................................2目录............................................................................................................................3第一章绪论................................................................................................................51.1研究制动系统的意义.............................................................................................51.2制动系统的发展状况.............................................................................................6第二章制动系统的总体设计....................................................................................82.1制动系的设计要求.................................................................错误!未定义书签。2.2汽车参数的选择.....................................................................错误!未定义书签。2.3制动器方案的选择.................................................................错误!未定义书签。2.4制动驱动机构方案选择.........................................................错误!未定义书签。第三章制动过程的动力学参数计算......................................................................103.1制动过程车轮所受的制动力................................................................................103.1.1地面制动力.........................................................................................................103.1.2制动器制动力.....................................................................................................113.1.3地面对前、后车轮的法向反作用力.................................................................123.1.4理想的前、后制动器制动力分配曲线.............................................................133.2制动距离与制动减速度计算................................................................................173.2.1制动距离与制动减速度.....................................................................................173.2.2制动距离的分析.................................................................................................183.3同步附着系数与附着系数利用率计算................................................................183.4制动器的最大制动力矩........................................................................................21第四章制动器的结构参数设计................................................................................244.1制动鼓内径D.......................................................................................................244.2摩擦衬片宽度b包角.......................................................................................254.3摩擦衬片起始角o..............................................................................................264.4制动器中心到张开力0F作用线的距离e..........................................................264.5制动蹄支承点位置坐标a和c................................................................