汽车专业英语读译教程 作者 宋进桂_ 15-U9TA.ppt

●5月12日14时28分，我国四川发生里氏8级地震 ●在地震发生的这一周内，3.4万同胞遇难，22万余人受伤 ●国务院已决定： 5月19日~21日为全国哀悼日 5月19日14时28分，全国人民为地震灾区遇难同胞默哀3分钟 2008年5月19日12时 UNIT 9 AUTOMATIC TRANSMISSIONS TEXT AAutomatic Transmission (AT)  UNIT 8 AUTOMATIC TRANSMISSIONS TEXT AAutomatic Transmission (AT) ? Torque Converter? Planetary Gear? Hydraulic System Servos and Accumulators Hydraulic Control System ? Electronic Control System 本次课学习目标 掌握自动变速器的有关英文专业词汇 能够较好地用已知翻译技巧进行课文翻译 训练快速阅读能力，较高的阅读速度 NEW WORDS As the speed of the turbine increases, the fluid spins faster and faster in the direction of engine rotation. As a result, the ability of the stator to redirect the fluid flow is reduced. Under cruising conditions, the stator is eventually forced to rotate on its one-way clutch in the direction of engine rotation. Under these conditions, the torque converter begins to behave almost like a solid shaft, with the torus and turbine speeds being almost equal. PLANETARY GEAR The ability of the torque converter to multiply engine torque is limited. Also, the unit tends to be more efficient when the turbine is rotating at relatively high speeds. Therefore, a planetary gearbox is used to carry the power output of the turbine to the driveshaft. Planetary gears function very similarly to conventional transmission gears. However, their construction is different in that three elements make up one gear system, and, in that all three elements are different from one another [3]. The three elements are: an outer gear that is shaped like a hoop, with teeth cut into the inner surface; a sun gear, mounted on a shaft and located at the very center of the outer gear; and a set of four planet gears, held by pins in a ring-like planet carrier, meshing with both the sun gear and the outer gear （Fig.9-3）. Either the outer gear or the sun gear may be held station