ENGLISH FOR AUTOMOBILE ENGINEERING -UNIT 3 ROTARY SYSTEM docx

ENGLISH FOR AUTOMOBILE
ENGINEERING

UNIT 3
ROTARY SYSTEM
Lecturer: Lang Van Thang

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Presentation
Read the text and complete

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Practice 1
Using Figure 3.2 to complete the text below:
a) D has a greater number of teeth
b) B has a

greater diameter

c) F has a faster
d)

speed

E has a faster speed

e) The speed of

B

than
than

than
than

F.
C.

D .
F.

is slower than the speed of

f) C has a smaller number of
A has a slower speed.

teeth

C

.

than A, so

g) B has a greater number of teeth than A; the speed of
B is therefore Slower than A .

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Practice 2
Choose a, b, c, d or e to complete the sentences. Use
Figure 3.2 and Table 3.1 below:
a) The ratio of the number of teeth is

b

the size ratio.
e

b) The two gear system in Figure 3.2 are
c

c) A:C and D:F are
d) The movement of A is
e) The speed of B is

d

.

.
a

the movement of B.

the speed of A.

f) The direction of movement of D is
of movement F.

b

the direction

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Practice 3

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Practice 3
1. If the movement of the bottom pulley is anticlockwise,
the movement of the Top pulley is also Anticlockwise.
2. If the movement of the top pulley is clockwise, the
movement of the bottom pulley is also clockwise .
3. If the movement of the front sprocket is anticlockwise,
the movement of the rear sprocket is also Anticlockwise .
4. If the movement of the small gear is anticlockwise ,
the movement of the large gear is clockwise .
5. If the movement of the large gear is clockwise, the
movement of the small gear is anticlockwise .
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Practice 4
Read the text following; then complete the second one.
Use Figures 2.5 and 2.6.

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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.

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Practice 4
Read the text following; then complete the second one.
Use Figures 2.5 and 2.6.

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Bikes have a sprocket and chain system. The number
of teeth on the sprockets is very important. On the
sprocket has 32
bike in Figure 2.6, the front
teeth and The rear sprocket has 16 teeth .

If the speed of the front sprocket is 60 rev/min,
the speed of the rear sprocket is 120 rev/min .
Therefore:
Speed of
rear
sprocket

Speed of
= front
sprocket

x

teeth of front
sprocket
teeth of rear
sprocket

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Practice

Speed of
rear
sprocket

Speed of
= front
sprocket

x

Diameter of front
sprocket
Diameter of rear
sprocket

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