27
Ⅱ
.
T
e
c
h
n
ic
a
l D
a
ta
Gear ratio
Low
High
Rotating speed
High
Low
Rotating power
Small
Large
●
Functions of Gears
1) Changing the direction of rotation
The direction of rotation becomes opposite.
90
°
2) Changing the rotating speed
3) Changing the torque
10 teeth
40 teeth
One rotation makes next gear rotate one-forth.
The speed is reduced to one-fourth.
Lever
Gear
Fulcrum
A
B
Put the power further
from the fulcrum.
The power (leverage) becomes
larger near the point to the fulcrum.
Power (small)
A
B
Fulcrum
Power (large)
Gear ratio =
the number of motor
rotation
the number of the last
gear rotation
