Introduction of Gear

              Gears: 

•A gear is a rotating machine part having cut teeth which mesh with another toothed part in 

 order to transmit torque 

   
Gear Box (Transmission):

• Two or more gears working in tandem are called a  transmission and can produce a 

   mechanical advantages through a gear ratio 

• Gear devices can change the speed, magnitude and direction of a power source

•An advantage of gears is that the teeth of gear prevent slipping

• When two gears of unequal number of teeth are combined a mechanical advantage is 

  produced, with both the rotational  speeds and the torques of the two gears differing 

 

Spur Gear:

• Spur gears are straight cut gears 

 

Helical Gear:

• The leading edges of the teeth are not parallel to the axis of rotation, but are set  an angle

Double Helical Gear (Herringbone):

• Having two sets of teeth that are set in a V shaped 

  

 Worm Gear:

 • A worm gear is meshed with a worm wheel 

 

Rack and Pinion Gear:

 • A rack is toothed bar that can be thought of as a sector gear with an infinitely  large radius 

  of curvature 

 

 Helical Gear:

 

 •The leading edges of the teeth are not parallel to the axis of rotation, but are set at an 

   angle

Epicyclic Gear:

• In epicyclic gear one or more gear axes moves