ChapterMT.ppt

* CHAPTER 3 power train SEA * Review 1: What’s the function of transmission? Changes the engine torque Reverses the vehicle movement Disengages the drive 3.3 transmission 1) The modern automobile engine is a powerful, lightweight, and dependable powerplant. However, it is not perfect for three reasons. 新型的汽车发动机动力强劲、质量轻便而且性能可靠。然而它有三个美中不足的原因。 Full-load Performance Curve of Toyota L4 SOHC 8V Engine Review 2: List the types of transmission. Finite Infinite MT＝Manual Transmission （手动变速器） AT＝Automatic Transmission （自动变速器） AMT＝Automatic Mechanical Transmis （液力机械变速器） CVT＝Continuously Variable Transmission （无级变速器） 2) In simple terms, a gearbox multiplies engine torque and --- through gears--- sends that power to the drive axle. A driver shifts or changes the gears to increase or decrease the torque produced by the engine. 简而言之，变速器利用齿轮扩大发动机的扭矩，向传动轴传递动力。驾驶员通过换挡来升高或降低发动机的输出扭矩。 Review 3: What’s the meaning of gear ratio? Gear ratio = Drive gear teeth number Driven gear teeth number Drive Gear Driven Gear 3.3.1 manual transmission Review 4: List the mesh methods of manual transmission. Sliding-mesh Transmission Constant-mesh Transmission Synchro-mesh Transimission Review 5: List the types of transmission gear. Bevel gear 锥齿轮 Helical gear 斜齿轮 Double helical gear 人字齿轮 Pinion gear 小齿轮 Hypoid gear 准双曲面齿轮 Planetary gear 行星齿轮 External gear 外啮合齿轮 Internal gear 内啮合齿轮 3) Sliding-mesh transmission: Although this type is rarely used today, it is included because the gear layout forms the basic construction of most modern manual gearboxes. 尽管现在几乎不使用滑动啮合变速器，但在这里仍然要提及，因为它是目前大多数手动变速器的雏形。 4) Sliding-mesh transmission: In the case of a sliding-mesh gearbox, gear changing demands skill if noise is to be avoided. Crashing (or clashing) of the gears as the result of a ba