重型货车气压制动系统结构设计说明书毕业论文.doc -- 8 元

I摘要汽车制动系的功用是使汽车以适当的减速度降速行驶直至停车在下坡行驶时，使汽车保持适当的稳定车速使汽车可靠地停在原地或坡道上。汽车的制动性是汽车主动安全性研究的重点内容之一。随着汽车行驶车速的不断提高，对汽车制动性能的要求也越来越高。汽车的制动系统除了实现良好的制动性能外，还要尽可能地减小驾驶员的工作强度。因此，动力制动系统在汽车上得到了广泛的应用。气压动力制动是最常见的动力制动系统，多用于中重型汽车。气压制动系统是发展最早的一种动力制动系统。其供能装置和传动装置全部是气压式的。其控制装置大多数是由制动踏板机构和制动阀等气压控制原件组成，也有的在踏板机构和制动阀之间还串联有液压式操纵传动装置。本文以一种重型货车为研究对象，通过理论分析和计算对其气压制动系统结构进行设计。关键词气压制动制动性重型货车传动装置ABSTRACTAutomobilebrakesystemfunctionistoreducethespeedofcarstoslowdownanddriverightuptoparking,Whentravelingdownhill,sothatthestabilityofvehiclespeedtomaintainproperTomakereliablecarsparkedintheramporinsitu.ThebrakeperformanceiSoneofthemostimportantsafeperformancesfortheautomobile．Withtheincreaseofrunningspeedofthevehicletherequirementstothebrakeperformancearegettingmoreandmorestrict．Besidesthegoodbrakeperformance，thebrakesystemoftheautomobileisrequiredtoreducethepedalforceofthedriver．Therefore，thepowerservobrakesystemhasmadeagreatdevelopmentintheautomobile．Thebarometricbrakesystemisthemostfamiliarpowerservobrakesystem．Thebarometricbrakesystemisthefirstdevelopmentofadynamicbrakingsystem.ItsenergysupplyallequipmentandgeartypepressureMostofthecontroldeviceisabrakepedalandthebrakeandotherinstitutionsformedtheoriginal,Alsosomeinthebrakepedalbetweeninstitutionsandalsoinserieswithhydrauliccontrolgear.Inthispaper,theapplicationofakindofheavygoodsvehicles,Throughtheoreticalanalysisandcalculationofthestructureofitsairbrakesystemdesign.KeywordsbarometricbrakesysterakeperformanceheavydutytruckDriveEquipment1绪论................................................................................11.1制动系的作用..................................................................11.2气压制动系的研究现状........................................................22制动系的总体设计................................................................32.1制动系统设计要求.............................................................32.2制动系参数的选择.............................................................42.3汽车总质量.....................................................................42.4制动力与制动力分配系数.....................................................42.5制动器最大制动力矩..........................................................93制动器的设计与计算............................................................123.1鼓式制动器的主要参数.......................................................133.1.1制动鼓内径.................................................................133.1.2摩擦衬片宽度b及包角..................................................143.1.3摩擦衬片起始角0.........................................................153.1.4制动蹄支撑点位置坐标a和C.............................................153.1.5制动器中心到张开力F0作用线的距离e..................................153.1.6摩擦衬片的型号及摩擦系数............................................153.2鼓式制动器的计算............................................................153.2.1计算有一个自由度的紧蹄摩擦片的径向变形规律.......................153.2.2计算蹄片上的制动力矩....................................................163.2.3检查制动蹄有无自锁.......................................................183.3衬片磨损特性的计算.........................................................193.3.1比能量耗散率（单位功负荷、能量负荷）...............................193.3.2衬片单位摩擦面积的制动器摩擦力f0比摩擦力.....................203.3.3驻车制动计算...............................................................213.4制动鼓主要零部件的结构设计...............................................213.4.1制动鼓......................................................................213.4.2制动蹄......................................................................223.4.3制动底板....................................................................233.4.4凸轮式张开机构............................................................233.4.5摩擦材料....................................................................233.4.6支承.........................................................................244气压制动驱动机构的设计计算.................................................254.1制动气室.......................................................................264.2贮气罐.........................................................................284.3空气压缩机....................................................................305技术经济性分析.................................................................316总结...............................................................................33致谢.................................................................................35参考文献...........................................................................34附录A................................................................错误未定义书签。附录B................................................................错误未定义书签。