第一章-传动系的构造与检修

这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office,branchoffices(jurisdiction),riskmanagement,marketingmanagementsectorthroughsupervisionandinspectionfoundproblems,shouldbeassignedtheinvestigatorsarecorrectedinatimelymanner.27ththefifthchapterpenaltyunderanyofthefollowingacts,thentherelevantprovisionstopunishtheinvestigators,accordingtotheBank.Toconstituteacrimeshallbeinvestigatedforcriminalresponsibility:(A)onthebusinessthatarenotinvolvedintheinvestigation,issuedasurvey.(B)customercreditinformationarenotthoroughverification.(Iii)toparticipateincreditcustomersurveyisnotinplace,customersanddataisincomplete,untrue;heknowsbearacounterfeitedclientsissuingcredit.(D)doesnotprovideforduediligenceofcreditbusiness,pre-loaninvestigationform,concealingfactsorprovidingfalseinformationorshouldbefoundinanormalinvestigationfailedtodiscovertheriskfactors,leadtothereviewandapprovalpolicyerrors,loanrisk.(Five)onloanguaranteesofsurveynotinplace,notbyprovidesonarrived,andpledgerealforfieldverification,andassessment,andidentificationandregistration,notaccordingtoprovidesonguarantorofguaranteesqualificationandguaranteescapacityforsurveyverified,ledtoguaranteesloanlostauthenticity,andlegitimacy,andeffectivenessof;cycleloanbusinessintheofmortgage第一章汽车传动系的构造与检修案例导入：案例一：汽车在行驶过程中，为了适应不同的路况，驾驶员需要经常地变换不同的档位，使汽车获得不同的行驶速度。那么传动系是如何传递动力的呢？案例二：一辆解放CA1091型汽车满载行驶。故障症状：在行驶过程中，当通过一个沟坎时，受到剧烈的冲击之后，汽车无法行驶。检查发现发动机运转正常，离合器工作正常，变速器能够正常挂档。相关知识：课题一：认知汽车行驶的基本原理任务导入想一想：汽车在起步时，驾驶员通过踩下离合器踏板→挂档→逐渐放松离合器踏板同时缓慢踩下加速踏板（两者相配合）的一系列操作，汽车为什么能够行驶？汽车在上坡时，驾驶员为什么要换入低档同时加大踩下加速踏板呢？汽车在冰雪路面上行驶时，为什么车轮滑转而汽车却不能行驶呢？针对这些疑问让我们进入以下的学习。任务一牵引力的产生任务分析：汽车要想从静止状态过渡到行驶状态，必须由外界提供一个顺着汽车行驶方向的推动力，使汽车克服阻力而运动。那么这个推动力是如何产生的呢？汽车为什么能运动呢？让我们进入下面的学习。任务：◇了解汽车行驶的基本原理；◇掌握牵引力、行驶阻力、附着力三者的关系；这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office,branchoffices(jurisdiction),riskmanagement,marketingmanagementsectorthroughsupervisionandinspectionfoundproblems,shouldbeassignedtheinvestigatorsarecorrectedinatimelymanner.27ththefifthchapterpenaltyunderanyofthefollowingacts,thentherelevantprovisionstopunishtheinvestigators,accordingtotheBank.Toconstituteacrimeshallbeinvestigatedforcriminalresponsibility:(A)onthebusinessthatarenotinvolvedintheinvestigation,issuedasurvey.(B)customercreditinformationarenotthoroughverification.(Iii)toparticipateincreditcustomersurveyisnotinplace,customersanddataisincomplete,untrue;heknowsbearacounterfeitedclientsissuingcredit.(D)doesnotprovideforduediligenceofcreditbusiness,pre-loaninvestigationform,concealingfactsorprovidingfalseinformationorshouldbefoundinanormalinvestigationfailedtodiscovertheriskfactors,leadtothereviewandapprovalpolicyerrors,loanrisk.(Five)onloanguaranteesofsurveynotinplace,notbyprovidesonarrived,andpledgerealforfieldverification,andassessment,andidentificationandregistration,notaccordingtoprovidesonguarantorofguaranteesqualificationandguaranteescapacityforsurveyverified,ledtoguaranteesloanlostauthenticity,andlegitimacy,andeffectivenessof;cycleloanbusinessintheofmortgage相关知识：如图1—1所示，当汽车行驶时，发动机的输出转矩通过传动系传给驱动车轮，使驱动车轮得到一个转矩Mt，由于汽车轮胎与地面接触，在转矩作用下，接触面处轮胎边缘对地面产生一个圆周力F0,它的方向与汽车行驶方向相反，其大小由下式表示：式中Mt—驱动车轮上的转矩；r—驱动轮的工作半径。根据作用力与反作用力的关系，路面对轮胎边缘施加一个反作用力Ft（即向前推力），其大小与F0相等，方向相反。我们通常把汽车行驶时，路面对轮胎边缘施加的推动力Ft，称牵引力（也称驱动力）。当牵引力增大到能克服汽车静止状态的最大阻力时，汽车便开始起步。任务二汽车的行驶任务分析：车轮从路面获得一个推动力，汽车就一定能行驶吗？汽车的行驶情况还受什么因素影响吗？让我们进入下面的学习。相关知识一行驶阻力汽车在行驶中会遇到各种阻力，主要有滚动阻力、空气阻力、上坡阻力和加速阻力等，统称汽车行驶阻力。1.滚动阻力主要是由于车轮滚动时轮胎与路面的变形以及车轮轴承内的摩擦所引起的阻力，用Ff表示，其大小与轮胎结构、轮胎气压、路面性质及汽车总重量有F0=Mtr1—1牵引力产生的原理这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office,branchoffices(jurisdiction),riskmanagement,marketingmanagementsectorthroughsupervisionandinspectionfoundproblems,shouldbeassignedtheinvestigatorsarecorrectedinatimelymanner.27ththefifthchapterpenaltyunderanyofthefollowingacts,thentherelevantprovisionstopunishtheinvestigators,accordingtotheBank.Toconstituteacrimeshallbeinvestigatedforcriminalresponsibility:(A)onthebusinessthatarenotinvolvedintheinvestigation,issuedasurvey.(B)customercreditinformationarenotthoroughverification.(Iii)toparticipateincreditcustomersurveyisnotinplace,customersanddataisincomplete,untrue;heknowsbearacounterfeitedclientsissuingcredit.(D)doesnotprovideforduediligenceofcreditbusiness,pre-loaninvestigationform,concealingfactsorprovidingfalseinformationorshouldbefoundinanormalinvestigationfailedtodiscovertheriskfactors,leadtothereviewandapprovalpolicyerrors,loanrisk.(Five)onloanguaranteesofsurveynotinplace,notbyprovidesonarrived,andpledgerealforfieldverification,andassessment,andidentificationandregistration,notaccordingtoprovidesonguarantorofguaranteesqualificationandguaranteescapacityforsurveyverified,ledtoguaranteesloanlostauthenticity,andlegitimacy,andeffectivenessof;cycleloanbusinessintheofmortgage关。2.空气阻力是汽车在行驶时，其表面与空气相摩擦，同时车身前部受到迎面气体压力及车身后部因空气涡流而产生真空度所引起的阻力，用Fw表示，其大小与汽车迎风面积、汽车与空气的相对速度、汽车外廓形状和表面摩擦系数有关。3.上坡阻力是指汽车上坡时，由于汽车重力和坡度所引起的阻力，用Fi表示，其大小与汽车总重量和道路纵向坡度角有关。4.加速阻力是指汽车在起步和加速时由于惯性作用所引起的阻力，用Fj表示，其大小与汽车的加速度和汽车的惯性质量有关。5.汽车起步后行驶阻力∑F为：∑F=Ff＋Fw+Fi+Fj通常当车速小于30km/h时空气阻力忽略不计。相关知识二汽车行驶的基本条件1.汽车的行驶情况取决于牵引力与行驶阻力的关系：当牵引力等于行驶阻力时，即Ft=∑F时，汽车匀速行驶或静止状态；当牵引力大于行驶阻力时，即Ft＞∑F时，