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UNIT 8 AUTOMATIC TRANSMISSION

UNIT 8 AUTOMATIC TRANSMISSION. 蒋 芳 吴喜骊. Basic Content. Aims and Requirements New Words Phrases and Expressions Notes to the Text Specialized Knowledge Exercises. Aims and Requirements. List the components of an automatic transmission List the components of torque converter

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UNIT 8 AUTOMATIC TRANSMISSION

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  1. UNIT 8 AUTOMATIC TRANSMISSION 蒋 芳 吴喜骊

  2. Basic Content Aims and Requirements New Words Phrases and Expressions Notes to the Text Specialized Knowledge Exercises

  3. Aims and Requirements List the components of an automatic transmission List the components of torque converter List the components of a planetary gearset Explain how CVT works

  4. New Words majority [mE5dVCriti] n. 多数，大半 servo [5sE:vEu] n. 伺服，伺服系统 clamp [klAmp] vt. 夹住，夹紧 actuate [5Aktjueit] vt. 开动，促使 demonstrate [5demEnstreit] vt. 证明，论证 whirl [(h)wE:l] v.（使）旋转，急动 impeller [im5pelE] n. 叶轮，泵轮 turbine [5tE:bin, -bain] n. 涡轮 curve [kE:v] vt. 弯，使弯曲 curl [kE:l] v.（使）卷曲

  5. New Words blade [bleid] n. 刀片，叶片 bushing [5buFiN] n. 轴衬，衬套 centerline [5sentElain] n. 中心线 Jupiter [5dVu:pitE] n. 木星 Mars [mB:z] n. 火星 overdrive [5EuvE5draiv] vt. 超速传动

  6. Phrases and Expressions shift lever 换档杆 oil pressure 油压，机油压力 torque converter 液力变矩器 planetary gearset 行星齿轮组 sun gear 太阳轮 planet gear 行星轮 planet gear carrier 行星架 ring gear 齿圈，齿环 fluid coupling 液力偶合器 valve body 阀体

  7. Phrases and Expressions gear ratio 传动比 dry friction clutch 干式摩擦离合器 fan blade 风扇叶片 external spline外花键 pressure regulator 压力调节器 manual valve 手控阀 vacuum modulator valve 真空调节阀 governor valve 调速阀 shift valve 换档阀

  8. Notes to the Text [1] A majority of modern cars use an automatic transmission (or transaxle) because it saves the driver from having to move a shift lever and depress a clutch pedal. 现代的大多数汽车使用自动变速器（或变速驱动桥），因为这样驾驶员就可以不用操纵变速杆和离合器踏板。

  9. Notes to the Text [2] The transmission gears, not only transmit power, they can increase or decrease speed and torque. 变速器齿轮不仅能够传递能量，也能增大或降低转速和扭矩。

  10. Notes to the Text [3] These splines fit into splines in the torque converter turbine and a driving unit in the transmission. 输入轴两端的外花键分别与变矩器涡轮和变速器驱动部件的内花键相啮合。

  11. Notes to the Text [4] Just as our planets (Earth, Jupiter, Mars) circle the sun, the planet gears revolve around the sun gear. 就像行星（地球，木星，火星）围绕太阳转一样，行星齿轮围绕着太阳轮旋转。

  12. Specialized Knowledge Fig.8-1 Automatic transmission

  13. Specialized Knowledge Fig.8-2 Two fans demonstrate principle of fluid coupling or torque converter Fig.8-3 Torque converter

  14. Specialized Knowledge Fig.8-4 Planetary gearset

  15. Specialized Knowledge Fig.8-5 CVT operation

  16. Exercises (1) What do the main components that make up an automatic transmission include? (2) What is the method that an automatic transmission uses to transfer power? (3) What is a planetary gearset designed to do? (4) What does the basic planetary gearset consist of? (5) List five functions of a planetary gearset.

  17. Exercises (6) What is a servo? (7) List and describe the major parts of the hydraulic system in an automatic transmission. (8) In an automatic transmission, how does it provide the correct gear ratio? (9) How will the output shaft turn at the same rate of speed as the input shaft? (10) How does the hydraulic system work?

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