Gears are used to transmit torque and change the speed and direction of rotation between a driving shaft and driven shaft. They can increase or decrease velocity and reverse direction. The number of teeth on each gear and their rotational speeds are related by a formula. Large enclosed gearboxes use oil pumps for lubrication, while smaller exposed gears can be lubricated with oil or grease by hand.

1. GEARS

2. Gears are used to transmit torque/motion
from the driving shaft to the
driven/follower shaft
-To change the velocity ratio
- to change the direction of rotation
-To get a positive drive.

9. N1 T1 = N2 T2
Where
N1 = RPM of driver gear .
T1 = number of teeth in the driver gear .
N2 = rpm of the follower/driven gear .
T2 = number of teeth in the driven gear .

10. The low speed gears which are visible may be
lubricated with an oilcan or brush.
The enclosed gear trains should be packed in
grease or runs in an oil bath.
In the case of big gearboxes mounted with
different levels of gear sets , they are provided
with oil pumps for lubrication purpose.

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