汽车毕业论文---xc90汽车自动变速器原理与故障分析

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1、摘要随着当今经济的快速发展，轿车越来越普遍的作为普通的消费品进入百姓家庭。人们在追求享受的同时也越来越在乎汽车的使用经济性和驾驶的简便性，于是自动变速器在轿车中应运而生，满足了人们对汽车的舒适性和驾驶的简便性。汽车自动变速器包括有级变速器和无级变速器（CVT）两种。沃尔沃XC90轿车装配的是自动有级变速器（AT），该变速器与前置前驱发动机相匹配输出更强劲的动力。自动变速器主要由液力变矩器、油泵、齿轮变速机构、人机控制系统、阀板5个部分组成。常见的变速器的故障原因有液力变矩器的故障、油泵的故障以及阀体的故障维修。关键词:自动变速器：Au

2、tomaticTransmission无级变速器：ContinuouslyVariableTransmission液力变矩器：Hydraulictorqueconverter油泵：PumpABSTRACWiththerapiddevelopmentofeconomy,carsmoreandmorepopularasordinaryconsumergoodsintopeoplefamily.Peopleinthepursuitofenjoyandatthesametimegettingcareaboutcarusageeconomyan

3、ddrivingthesimplicityofautomatictransmission,thencameintobeinginthecartomeetpeoplefortheautomobiledrivingcomfortandconvenience.Autoautomatictransmissionincludevariabletransmissionandvariator(CVT)twokinds.VOLVOXC90carassemblyisautomaticallyhavevariabletransmission(AT),th

4、etransmissionismatchedwithleadprecursorengineoutputstrongerimpetus.Automatictransmissionmainlybythehydraulictorqueconverter,oilpump,gearshiftingagency,man-machinecontrolsystem,thevalveplatefiveparts.Commontransmissionfaultreasonhashydraulictorqueconverterfaults,andthebo

5、dyofoilpumpfailurebreakdownmaintenance.目录第一章、自动变速器结构原理.......................................................4一、自动变速器的组成........................................................4二、自动变速器的控制面板.....................................................5第二章、液力变矩器的结构与工作原理..........

6、....................................6一、液力耦合器的结构原理.....................................................6二、液力变矩器结构原理.......................................................7第三章、油泵的结构与工作原理....................................................7一、内啮合齿轮泵的结构......................

7、.................................8二、内啮合齿轮泵的故障原理...................................................8第四章、齿轮变速机构的结构与工作原理.............................................9一、概述....................................................................9二、行星齿轮机构与变速原理.....................

8、..............................9三、换挡执行机构的结构和故障原理............................................10第五章、人机控制系统.......