transmission要点.ppt

chapter 15 Manual Transmission 1.the construction of the manual transmission 2. the principle of the synchronizer 3. the operation of the manual transmission 二、同步器(synchronizer) 1.the purpose of synchronizer 2.the principle of inertia synchronizer inertia lock key type synchronizer 惯性式锁环式同步器 inertia lock pin type synchronizer 惯性式锁销式同步器 三、换档机构(gearshift mechanism) inertia lock pin type synchronizer 惯性式锁销式同步器 摩擦锥环 摩擦锥盘 接合套 定位销 摩擦锥环 摩擦锥盘 花键毂 锁销 摩擦锥环 摩擦锥盘 花键毂 接合套 定位销 锁销 * * 湖北汽车工业学院汽车工程系 HuBei Automotive Industries Institute Dep. of Automobile HBQY * 变速器 Transmission 有级式 无级式 手动变速器 MT ＝Manual Transmission 自动变速器 AT＝Automatic Transmission 自动机械式变速器 AMT＝Auto Mechanical Transmission 无级变速器 CVT＝Continuously Variable Transmission purpose : 1.to provide the operator with a selection of gear ratios 2.to provide reverse 3.to break power transfer Gear terminology 一、普通齿轮式变速器结构 driven gear spur gear helical gear drive gear i=n1/n2=Z2/Z1*Z4/Z3=driven/drive*driven/drive n1 n2 z2 z1 z4 z3 n primary shaft mainshaft countershaft direct drive reverse idler shaft 三轴式变速器(transmission) Power flow：in 1st speed Direct drive 第一轴 第二轴 中间轴 countershaft primary shaft mainshaft overdrive sketch of power flow In first speed Setting intermediate gear ratio P n n1 n2 ?V 润滑、密封与取力 离合器从动盘 汽车惯性质量 5th gear 花键毂 接合套 4 5 接合齿圈 无同步器时的四、五挡齿轮示意图 dog clutch hub 4th gear sleeve Vehicle inertia mass 离合器从动盘 汽车惯性质量 四档 五档 花键毂 接合套 4 5 接合齿圈 四挡 五挡 a 2. Va = V4 1. V5 V4 3.V5 4.V5 = Va 离合器从动盘 汽车惯性质量 四档 五档 花键毂 接合套 4 5 接合齿圈 四档 五档 1. V5 V4 a 2. Va = V5 3.V4 4. ? V4= Va 5.V4 6. V4= Va (加油) Release accelerator and depress clutch 2. Shift lever to neutral and release clutch 3. Accelerate engine 4. Depress clutch and shift lever to lever gear 5. Release clutch and accelerate Speeded up Changing down Depress clutch and shift lever to neutral 2 .Release clutch, pause and depress clutch 3 .Shift lever to higher gear and release clutch Slowed down C