HOCHIMINH UNIVERSITY OF INDUSTRY
UNIT 3
Lecturer: Lang Van Thang
ENGLISH FOR AUTOMOBILE
ENGINEERING
ROTARY SYSTEM

HOCHIMINH UNIVERSITY OF INDUSTRY
Presentation
Read the text and complete

HOCHIMINH UNIVERSITY OF INDUSTRY
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 .

HOCHIMINH UNIVERSITY OF INDUSTRY
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

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

HOCHIMINH UNIVERSITY OF INDUSTRY
In pulley systems, the diameter of the pulleys is very

teeth of front
sprocket
teeth of rear
sprocket
=
x

HOCHIMINH UNIVERSITY OF INDUSTRY
Practice
Speed of
rear
sprocket
Speed of
front
sprocket
Diameter of front
sprocket
Diameter of rear
sprocket
=
x

HOCHIMINH UNIVERSITY OF INDUSTRY