ENGLISH FOR AUTOMOBILE ENGINEERING -UNIT 3 ROTARY SYSTEM docx

Practice 2a The ratio of the number of teeth is the size ratio.. If the movement of the front sprocket is anticlockwise, the movement of .the rear sprocket is also Anticlockwise 4.. sma

UNIT 3

Lecturer: Lang Van Thang

ENGLISH FOR AUTOMOBILE

ENGINEERING

ROTARY SYSTEM

Presentation

Read the text and complete

Practice 1

a) D has a number of teeth F b) B has a diameter C

d) has a faster speed F

g) B has a greater number of teeth than A; the speed of

is therefore

e) The speed of is slower than the speed of f) C has a smaller A, so

A has a speed

greater greater faster E

B number of teeth than

B

Using Figure 3.2 to complete the text below:

c) F has a speed

than

than than

D

slower

than

C

Slower than A

Practice 2

a) The ratio of the number of teeth is the size ratio

c) A:C and D:F are

b) The two gear system in Figure 3.2 are

d) The movement of A is the movement of B

Choose a, b, c, d or e to complete the sentences Use Figure 3.2 and Table 3.1 below:

e) The speed of B is the speed of A

f) The direction of movement of D is the direction

of movement F

b

e c

a d

b

Practice 3

Practice 3

1 If the movement of the bottom pulley is anticlockwise, the movement of the is also Top pulley Anticlockwise

2 If is clockwise, the movement of the bottom pulley is also

the movement of the top pulley

clockwise

3 If the movement of the front sprocket is anticlockwise, the movement of the rear sprocket is also Anticlockwise

4 small gear , the movement of the large gear is

If the movement of the

clockwise is anticlockwise

5 If large is clockwise, the movement of the small gear is

the movement of the

anticlockwise gear

Practice 4

Read the text following; then complete the second one Use Figures 2.5 and 2.6.

In pulley systems, the diameter of the pulleys is very important In pulley system in Figure 2.5, the diameter

of the top pulley is 20 cm and the diameter of the bottom pulley is 10 cm

If the speed of the top pulley is 100 revolutions per minute (100 rev/min), the speed of the bottom pulley is

200 rev/ min

Practice 4

Read the text following; then complete the second one Use Figures 2.5 and 2.6

Bikes have a sprocket and chain system The number

of teeth on the sprockets is very important On the bike in Figure 2.6, the has 32 teeth and

If front sprocket is 60 rev/min, the

Therefore:

front sprocket The rear sprocket has 16 teeth the speed of the

speed of the rear sprocket is 120 rev/min

Speed of

rear

sprocket

Speed of front

sprocket

teeth of front sprocket

teeth of rear sprocket

Practice

Speed of

rear

sprocket

Speed of front

sprocket

Diameter of front sprocket

Diameter of rear sprocket