I摘要汽車制動(dòng)系的功用是使汽車以適當(dāng)?shù)臏p速度降速行駛直至停車；在下坡行駛時(shí)，使汽車保持適當(dāng)?shù)姆€(wěn)定車速；使汽車可靠地停在原地或坡道上。汽車的制動(dòng)性是汽車主動(dòng)安全性研究的重點(diǎn)內(nèi)容之一。隨著汽車行駛車速的不斷提高，對(duì)汽車制動(dòng)性能的要求也越來(lái)越高。汽車的制動(dòng)系統(tǒng)除了實(shí)現(xiàn)良好的制動(dòng)性能外，還要盡可能地減小駕駛員的工作強(qiáng)度。因此，動(dòng)力制動(dòng)系統(tǒng)在汽車上得到了廣泛的應(yīng)用。氣壓動(dòng)力制動(dòng)是最常見(jiàn)的動(dòng)力制動(dòng)系統(tǒng)，多用于中重型汽車。氣壓制動(dòng)系統(tǒng)是發(fā)展最早的一種動(dòng)力制動(dòng)系統(tǒng)。其供能裝置和傳動(dòng)裝置全部是氣壓式的。其控制裝置大多數(shù)是由制動(dòng)踏板機(jī)構(gòu)和制動(dòng)閥等氣壓控制原件組成，也有的在踏板機(jī)構(gòu)和制動(dòng)閥之間還串聯(lián)有液壓式操縱傳動(dòng)裝置。本文以一種重型貨車為研究對(duì)象，通過(guò)理論分析和計(jì)算對(duì)其氣壓制動(dòng)系統(tǒng)結(jié)構(gòu)進(jìn)行設(shè)計(jì)。關(guān)鍵詞：氣壓制動(dòng)；制動(dòng)性；重型貨車；傳動(dòng)裝置；ABSTRACTAutomobilebrakesystemfunctionistoreducethespeedofcarstoslowdownanddriverightuptoparking,Whentravelingdownhill,sothatthestabilityofvehiclespeedtomaintainproperTomakereliablecarsparkedintheramporinsitu.ThebrakeperformanceiSoneofthemostimportantsafeperformancesfortheautomobileWiththeincreaseofrunningspeedofthevehicle；therequirementstothebrakeperformancearegettingmoreandmorestrictBesidesthegoodbrakeperformance，thebrakesystemoftheautomobileisrequiredtoreducethepedalforceofthedriverTherefore，thepowerservobrakesystemhasmadeagreatdevelopmentintheautomobileThebarometricbrakesystemisthemostfamiliarpowerservobrakesystemThebarometricbrakesystemisthefirstdevelopmentofadynamicbrakingsystem.Itsenergysupplyallequipmentandgear-typepressureMostofthecontroldeviceisabrakepedalandthebrakeandotherinstitutionsformedtheoriginal,Alsosomeinthebrakepedalbetweeninstitutionsandalsoinserieswithhydrauliccontrolgear.Inthispaper,theapplicationofakindofheavygoodsvehicles,Throughtheoreticalanalysisandcalculationofthestructureofitsairbrakesystemdesign.Keywords；barometricbrakesyste；rakeperformance；heavy-dutytruck；DriveEquipment；1緒論.11.1制動(dòng)系的作用.11.2氣壓制動(dòng)系的研究現(xiàn)狀.22制動(dòng)系的總體設(shè)計(jì).32.1制動(dòng)系統(tǒng)設(shè)計(jì)要求.32.2制動(dòng)系參數(shù)的選擇.42.3汽車總質(zhì)量.42.4制動(dòng)力與制動(dòng)力分配系數(shù).42.5制動(dòng)器最大制動(dòng)力矩.93制動(dòng)器的設(shè)計(jì)與計(jì)算.123.1鼓式制動(dòng)器的主要參數(shù).133.1.1制動(dòng)鼓內(nèi)徑.133.1.2摩擦襯片寬度b及包角.143.1.3摩擦襯片起始角制動(dòng)蹄支撐點(diǎn)位置坐標(biāo)a和C.153.1.5制動(dòng)器中心到張開(kāi)力F0作用線的距離e.153.1.6摩擦襯片的型號(hào)及摩擦系數(shù).153.2鼓式制動(dòng)器的計(jì)算.153.2.1計(jì)算有一個(gè)自由度的緊蹄摩擦片的徑向變形規(guī)律.153.2.2計(jì)算蹄片上的制動(dòng)力矩.163.2.3檢查制動(dòng)蹄有無(wú)自鎖.183.3襯片磨損特性的計(jì)算.193.3.1比能量耗散率（單位功負(fù)荷、能量負(fù)荷）.193.3.2襯片單位摩擦面積的制動(dòng)器摩擦力f0(比摩擦力).203.3.3駐車制動(dòng)計(jì)算.213.4制動(dòng)鼓主要零部件的結(jié)構(gòu)設(shè)計(jì).213.4.1制動(dòng)鼓.213.4.2制動(dòng)蹄.223.4.3制動(dòng)底板.233.4.4凸輪式張開(kāi)機(jī)構(gòu).233.4.5摩擦材料.233.4.6支承.