03-10-2012, 05:08 PM
GEAR
gear.ppt (Size: 626 KB / Downloads: 39)
GEAR…..
Power transmission is the movement of energy from its place of generation to a location where it is applied to performing useful work
A gear is a component within a transmission device that transmits rotational force to another gear or device
TYPES OF GEARS
According to the position of axes of the shafts.
Parallel
1.Spur Gear
2.Helical Gear
3.Rack and Pinion
b. Intersecting
Bevel Gear
c. Non-intersecting and Non-parallel
worm and worm gears
SPUR GEAR
Teeth is parallel to axis of rotation
Transmit power from one shaft to another parallel shaft
Used in Electric screwdriver, oscillating sprinkler, windup alarm clock, washing machine and clothes dryer
Helical Gear
The teeth on helical gears are cut at an angle to the face of the gear
This gradual engagement makes helical gears operate much more smoothly and quietly than spur gears
One interesting thing about helical gears is that if the angles of the gear teeth are correct, they can be mounted on perpendicular shafts, adjusting the rotation angle by 90 degrees