ChapterAT().ppt

* chapter 3 power train SEA * 3.3.4 Automatic Transmission (AT) Review 1: List the parts of Automatic Transmission (AT). 1） Automatic transmissions (AT) Automatic transmissions have three basic systems --- a torque converter, a gear system, and a hydraulic system. These fit together in a unit that fastens directly behind the engine. [Fig. 3-9]. The front section of the transmission houses the torque converter. The torque converter is like the clutch in a manual transmission. It is the coupling between the engine and drive train that transmits power to the drive wheels. 自动变速器由液力变矩器、齿轮机构和液压控制系统等三个基本系统组成，它们组合在一起，直接安装在发动机后（图3-9）。液力变矩器位于变速器的前端，它类似于手动变速器里的离合器，布置在发动机和传动系之间，向驱动轮传递动力。 Review 2: What’s the theory of hydrodynamic coupling? Parts of Torque Converter Review 3: List the parts of Planetary Gear system. Ring gear Planetary gear Planet carrier Sun gear 2）planetary gears: The planet gears are actually one set of gears joined together by a cage called the planet gear carrier or planet pinion carrier. The carrier has pins that go through the center of each of the planet gears. Thus, all the planet gears move together when the planet carrier moves. Each planet gear can turn around its pin when the planet gear carrier is stationary. 行星齿轮机构是一组齿轮，由行星架将这些齿轮组合在一起。行星架上有销穿过每个行星轮的中心。当行星架运动时，所有的行星轮也随之运动。当行星架固定时，行星轮绕销转动。 Review 4: How the Planetary Gear system works? 3）how the planetary system work: The planetary system works on the following principles: With one part held stationary, torque and power can be applied to a second member to make a third member rotate. In other words, with one of the three members held stationary, torque is applied to either of the other two members and output torque is delivered from the third member. 行星齿轮系的工作原理如下：当一个部件固定时，扭矩和动力会施加给第二个部件，从而带动第三个部件旋转。也就是说，在三个部件中只要使一个部件固定，扭矩会传递给其它两部件的任何一个部件，动力就会从第三个部件输出。 4）ring gear stationary (gear reduction): When you hold the ring gear and apply torque to the sun gear, the planet carrier