轮机英语教学课件(03) Diesel Engine Construction (II)

Step Five: Related Multiple Choices to the
Competency Test
Vocabulary
1. dowel pin n. 定位销
2. narrow a. 窄的 broad
a. 宽的 wide a. 广泛的
3. distributor n. an oil distributor ring 布油环
3. What are the functions of the dowel pin and machine-turned recesses?
4. How many rings does a piston usually have?
5. What are the two or three topmost rings?
guide shoes
导向滑块
12. be white metal lined 表面浇有白合金
13. be distributed evenly 均匀分布
14. the forced lubricating system 强力润滑系统
15. articulated pipes telescopic pipes 伸缩管
Hale Waihona Puke Baidu
23. lubrication grooves 滑油槽
24. the bearing clearances 轴承间隙
25. the force-feed lubrication system 强力润滑系统
Cylinder head 气缸头
Inlet valve 进气阀
Exhaust valve 排气阀
13. Why is the crosshead short and rigid?
14. What are the pistons usually cooled by? And how are they cooled?
15. What’s the function of the piston rod stuffing box?
11. clearance n. to adjust the clearance 12. channel n. 频道, 通道, =passage
the English Channel 英吉利海峡 13. carrier ring n. 承磨环 14. built-in a. 内装的，机内的， 固定的 15. tap-bolt n. 锥体螺栓 16. white metal 白合金 17. telescopic pipe 伸缩管，拉管 18. fitted bolt n. 紧配螺栓
10. What are the crosshead shoes mounted?
11. By what are the guide shoes secured to the crosshead?
12. Why do the white-metal-lined crosshead shoes have horizontal grooves?
16. the slotted pipes 开槽的管子
Crankshaft 曲轴
Crank throw 曲拐 Crankpin journal 曲柄销
Crank throw web (arm) 曲柄臂 Main bearing journal 主轴颈
Useful Expressions
17. sight glass 观察镜
Step Four Try to answer the following questions.
1. What does a piston consist of?
2. What is the piston skirt made of and what is the piston crown made of?
pipes. The oil is led to the cooling spaces of the piston through the telescopic pipes. The oil is conducted from the pistons through the internal pipes of the piston rods.
Step Three: Grammatical points
1. in relation to… 相关的，有关的 related to relating to 2. be admitted to (through), be led to, be conducted to e.g. The cooling oil is admitted through the
Useful Expressions
1. piston skirt 活塞裙 piston crown 活塞头 piston head 活塞头 piston rod 活塞杆
2. machine-turned recesses 机加工的凹槽
3. narrow rings having diagonal cuts 带有斜切口的窄环 4. broad rings with overlapping end joints 带有重叠搭口的宽环
4. round a. v. be rounded on the external top
5. annular a. to form an annular space
形成环形空间
6. assembly n. 组装, 组件
assemble v. 组装, reassemble v. 重新组装
disassemble v. 拆卸, 分解
9. the outside diameter of the pipe 管子的外径
10. to ensure the correct assembly of the components 确保各部件的正确组装
Useful Expressions
11. crosshead shoes 十字头滑块
crosshead guides 十字头导板
7. component n. 组成部分, 部件 =part
8. horizontally adv. 水平地
vertically adv. 垂直地
9. duct n. 比较 pipe, tube and hose 10. shim n. 垫片
shims of different thicknesses
19. What are used to support the crankshaft?
20. What type is the crankshaft usually adopted?
Lesson Three
Diesel Engine Construction (II)
Teaching Procedures:
Step One: Lead-in Question
Step Two: Vocabulary
Step Three: Grammatical Points
Step Four: Questions
16. What are the crossheads and crankpin bearings made of?
17. What does each of them consist of?
18. What are inserted between the shells to adjust the bearing clearance?
5. during the running-in period 在磨合期间
6. thermal stress 热应力
活塞
A trunk piston 筒形活塞
Useful Expressions
7. to direct the cooling liquid flow 引导冷却液流
8. to intensify the conventional ‘cocktail shaker’ effect 加强，加剧常规的“鸡尾振荡”效应
6. What are the next two piston rings?
7. What is the lowest ring used for?
8. Why are all rings slightly rounded on the external top and bottom edges?
9. What is the internal structure of a piton rod?
18. piston rod stuffing box 活塞杆填料箱
19. sealing rings and scraper rings 密封环和刮油环
oil springs 弹簧圈， 卡簧
21. crankpin bearings 曲柄销轴承
22. compression shims 压缩片， 调整片