PPT: Gears Mechanical Engineering Notes | EduRev

Theory of Machines (TOM)

Mechanical Engineering : PPT: Gears Mechanical Engineering Notes | EduRev

 Page 1


Gears (Higher Pair)
• Type of Gears
• Nomenclature
• Involute Profile
• Gear Construction
• Gear Trains
• Questions and examples
Page 2


Gears (Higher Pair)
• Type of Gears
• Nomenclature
• Involute Profile
• Gear Construction
• Gear Trains
• Questions and examples
Types of Gears
According to the position of axes of the shafts
• Parallel
?Spur
?Helical
?Rack and Pinion
• Intersecting
?Bevel Gear
• Non intersecting
?Worm and worm wheel
Page 3


Gears (Higher Pair)
• Type of Gears
• Nomenclature
• Involute Profile
• Gear Construction
• Gear Trains
• Questions and examples
Types of Gears
According to the position of axes of the shafts
• Parallel
?Spur
?Helical
?Rack and Pinion
• Intersecting
?Bevel Gear
• Non intersecting
?Worm and worm wheel
Spur Gear
• Used in transmitting torque between parallel shafts
• Simplest type of gear
• Teeth are cut parallel to shaft axis
• Easy to manufacture
• If one of the gear has infinite diameter, then 
it is called rack, ( Rack and pinion)
Page 4


Gears (Higher Pair)
• Type of Gears
• Nomenclature
• Involute Profile
• Gear Construction
• Gear Trains
• Questions and examples
Types of Gears
According to the position of axes of the shafts
• Parallel
?Spur
?Helical
?Rack and Pinion
• Intersecting
?Bevel Gear
• Non intersecting
?Worm and worm wheel
Spur Gear
• Used in transmitting torque between parallel shafts
• Simplest type of gear
• Teeth are cut parallel to shaft axis
• Easy to manufacture
• If one of the gear has infinite diameter, then 
it is called rack, ( Rack and pinion)
Helical Gear
• Used in transmitting torque between parallel shafts
• Teeth are cut at an angle with the shaft axis
• Helical gears can be meshed in parallel or crossed orientations.
• The angled teeth engage more gradually than spur gear teeth, 
causing them to run more smoothly and quietly
• Double Helical gear
Page 5


Gears (Higher Pair)
• Type of Gears
• Nomenclature
• Involute Profile
• Gear Construction
• Gear Trains
• Questions and examples
Types of Gears
According to the position of axes of the shafts
• Parallel
?Spur
?Helical
?Rack and Pinion
• Intersecting
?Bevel Gear
• Non intersecting
?Worm and worm wheel
Spur Gear
• Used in transmitting torque between parallel shafts
• Simplest type of gear
• Teeth are cut parallel to shaft axis
• Easy to manufacture
• If one of the gear has infinite diameter, then 
it is called rack, ( Rack and pinion)
Helical Gear
• Used in transmitting torque between parallel shafts
• Teeth are cut at an angle with the shaft axis
• Helical gears can be meshed in parallel or crossed orientations.
• The angled teeth engage more gradually than spur gear teeth, 
causing them to run more smoothly and quietly
• Double Helical gear
Bevel Gears
• Used to transmit rotary motion between intersecting shafts
• Tooth-bearing faces of the gears are conically shaped
• Bevel gears are most often mounted on shafts that are 
90 degrees apart, but can be designed to work at other
angles as well.
• The pitch surface of bevel gears is a cone
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