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GEAR
             CONTENTS
•POWER TRANSMISSION
•GEAR
•TYPES OF GEARS
•NOMENCLATURE
•APPLICATIONS OF GEARS
•VELOCITY RATIO
•GEAR TRAINS
•EXAMPLE PROBLEMS AND QUESTIONS
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
1. According to the position of axes of the
    shafts.
b. 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
External and Internal spur Gear…
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
Helical Gear…
Herringbone gears
• To avoid axial thrust, two
  helical gears of opposite
  hand can be mounted side
  by side, to cancel resulting
  thrust forces

• Herringbone gears are
  mostly used on heavy
  machinery.
Rack and pinion
• Rack and pinion gears
  are used to convert
  rotation (From the
  pinion) into linear
  motion (of the rack)

• A perfect example of
  this is the steering
  system on many cars
Bevel gears
• Bevel gears are useful when the direction of a shaft's
  rotation needs to be changed
• They are usually mounted on shafts that are 90
  degrees apart, but can be designed to work at other
  angles as well
• The teeth on bevel gears can be straight, spiral or
  hypoid
• locomotives, marine applications, automobiles,
  printing presses, cooling towers, power plants, steel
  plants, railway track inspection machines, etc.
Straight and Spiral Bevel Gears
WORM AND WORM GEAR
• Worm gears are used when large gear reductions are
  needed. It is common for worm gears to have
  reductions of 20:1, and even up to 300:1 or greater
• Many worm gears have an interesting property that
  no other gear set has: the worm can easily turn the
  gear, but the gear cannot turn the worm
• Worm gears are used widely in material handling
  and transportation machinery, machine tools,
  automobiles etc
WORM AND WORM GEAR
NOMENCLATURE OF SPUR
       GEARS
NOMENCLATURE….
• Pitch surface: The surface of the imaginary rolling cylinder
  (cone, etc.) that the toothed gear may be considered to replace.
• Pitch circle: A right section of the pitch surface.
• Addendum circle: A circle bounding the ends of the teeth, in
  a right section of the gear.
• Root (or dedendum) circle: The circle bounding the spaces
  between the teeth, in a right section of the gear.
• Addendum: The radial distance between the pitch circle and
  the addendum circle.
• Dedendum: The radial distance between the pitch circle and
  the root circle.
• Clearance: The difference between the dedendum of one gear
  and the addendum of the mating gear.
NOMENCLATURE….
• Face of a tooth: That part of the tooth surface lying outside
  the pitch surface.
• Flank of a tooth: The part of the tooth surface lying inside the
  pitch surface.
• Circular thickness (also called the tooth thickness): The
  thickness of the tooth measured on the pitch circle. It is the
  length of an arc and not the length of a straight line.
• Tooth space: pitch diameter The distance between adjacent
  teeth measured on the pitch circle.
• Backlash: The difference between the circle thickness of one
  gear and the tooth space of the mating gear.
• Circular pitch (Pc) : The width of a tooth and a space,
  measured on the pitch circle.      πD
                                  Pc
                                      N
NOMENCLATURE….
• Diametral pitch (Pd): The number of teeth of a gear unit pitch
  diameter. The diametral pitch is, by definition, the number of
  teeth divided by the pitch diameter. That is,

Where                     Pd =
                                 N
                                 D
Pd = diametral pitch
N = number of teeth
D = pitch diameter

• Module (m): Pitch diameter divided by number of teeth. The
  pitch diameter is usually specified in inches or millimeters; in
  the former case the module is the inverse of diametral pitch.
                             m = D/N
VELOCITY RATIO OF GEAR
         DRIVE
d = Diameter of the wheel
N =Speed of the wheel
ω = Angular speed

                                ω2 N 2   d1
                                  =    =
                                ω1 N 1 d 2
         velocity ratio (n) =
GEAR TRAINS
• A gear train is two or more gear working
  together by meshing their teeth and turning
  each other in a system to generate power and
  speed
• It reduces speed and increases torque
• Electric motors are used with the gear systems
  to reduce the speed and increase the torque
Types of Gear Trains
•  Simple gear train
•  Compound gear train
•  Planetary gear train
Simple Gear Train
• The most common of the gear train is the gear pair
   connecting parallel shafts. The teeth of this type can
   be spur, helical or herringbone.
• Only one gear may rotate about a single axis
Simple Gear Train
Compound Gear Train
• For large velocities,
  compound
  arrangement is
  preferred
• Two or more gears
  may rotate about a
  single axis
Planetary Gear Train (Epicyclic Gear Train)
Planetary Gear Train…
• In this train, the blue gear has six times the diameter
  of the yellow gear
• The size of the red gear is not important because it is
  just there to reverse the direction of rotation
• In this gear system, the yellow gear (the sun) engages
  all three red gears (the planets) simultaneously
• All three are attached to a plate (the planet carrier),
  and they engage the inside of the blue gear (the ring)
  instead of the outside.
Planetary Gear Train…
• Because there are three red gears instead of
  one, this gear train is extremely rugged.
• planetary gear sets is that they can produce
  different gear ratios depending on which gear
  you use as the input, which gear you use as the
  output, and which one you hold still.
Planetary Gear Train…
• They have higher gear ratios.
• They are popular for automatic transmissions
  in automobiles.
• They are also used in bicycles for controlling
  power of pedaling automatically or manually.
• They are also used for power train between
  internal combustion engine and an electric
  motor
Short Quetions

•   What is power transmission?
•   Why gear drives are called positively driven?
•   What is backlash in gears?
•   What are the types of gears available?
•   What is gear train? Why gear trains are used?
•   Why intermediate gear in simple gear train is called idler?
•   What is the advantage of using helical gear over spur gear?
•   List out the applications of gears
•   Define the term ‘module’ in gear tooth
•   What is herringbone gear?
Essay type questions
•   With sketch explain various types of gears
•   With sketch explain three types of gear trains
•   With neat sketch explain the nomenclature of
    spur gear
•   Write the applications, advantages and
    disadvantages of gear drives

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Gear

  • 1. GEAR CONTENTS •POWER TRANSMISSION •GEAR •TYPES OF GEARS •NOMENCLATURE •APPLICATIONS OF GEARS •VELOCITY RATIO •GEAR TRAINS •EXAMPLE PROBLEMS AND QUESTIONS
  • 2. 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
  • 3. TYPES OF GEARS 1. According to the position of axes of the shafts. b. 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
  • 4. 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
  • 5. External and Internal spur Gear…
  • 6. 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
  • 8. Herringbone gears • To avoid axial thrust, two helical gears of opposite hand can be mounted side by side, to cancel resulting thrust forces • Herringbone gears are mostly used on heavy machinery.
  • 9. Rack and pinion • Rack and pinion gears are used to convert rotation (From the pinion) into linear motion (of the rack) • A perfect example of this is the steering system on many cars
  • 10. Bevel gears • Bevel gears are useful when the direction of a shaft's rotation needs to be changed • They are usually mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well • The teeth on bevel gears can be straight, spiral or hypoid • locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, railway track inspection machines, etc.
  • 11. Straight and Spiral Bevel Gears
  • 12. WORM AND WORM GEAR • Worm gears are used when large gear reductions are needed. It is common for worm gears to have reductions of 20:1, and even up to 300:1 or greater • Many worm gears have an interesting property that no other gear set has: the worm can easily turn the gear, but the gear cannot turn the worm • Worm gears are used widely in material handling and transportation machinery, machine tools, automobiles etc
  • 15. NOMENCLATURE…. • Pitch surface: The surface of the imaginary rolling cylinder (cone, etc.) that the toothed gear may be considered to replace. • Pitch circle: A right section of the pitch surface. • Addendum circle: A circle bounding the ends of the teeth, in a right section of the gear. • Root (or dedendum) circle: The circle bounding the spaces between the teeth, in a right section of the gear. • Addendum: The radial distance between the pitch circle and the addendum circle. • Dedendum: The radial distance between the pitch circle and the root circle. • Clearance: The difference between the dedendum of one gear and the addendum of the mating gear.
  • 16. NOMENCLATURE…. • Face of a tooth: That part of the tooth surface lying outside the pitch surface. • Flank of a tooth: The part of the tooth surface lying inside the pitch surface. • Circular thickness (also called the tooth thickness): The thickness of the tooth measured on the pitch circle. It is the length of an arc and not the length of a straight line. • Tooth space: pitch diameter The distance between adjacent teeth measured on the pitch circle. • Backlash: The difference between the circle thickness of one gear and the tooth space of the mating gear. • Circular pitch (Pc) : The width of a tooth and a space, measured on the pitch circle. πD Pc N
  • 17. NOMENCLATURE…. • Diametral pitch (Pd): The number of teeth of a gear unit pitch diameter. The diametral pitch is, by definition, the number of teeth divided by the pitch diameter. That is, Where Pd = N D Pd = diametral pitch N = number of teeth D = pitch diameter • Module (m): Pitch diameter divided by number of teeth. The pitch diameter is usually specified in inches or millimeters; in the former case the module is the inverse of diametral pitch. m = D/N
  • 18. VELOCITY RATIO OF GEAR DRIVE d = Diameter of the wheel N =Speed of the wheel ω = Angular speed ω2 N 2 d1 = = ω1 N 1 d 2 velocity ratio (n) =
  • 19. GEAR TRAINS • A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed • It reduces speed and increases torque • Electric motors are used with the gear systems to reduce the speed and increase the torque
  • 20. Types of Gear Trains • Simple gear train • Compound gear train • Planetary gear train Simple Gear Train • The most common of the gear train is the gear pair connecting parallel shafts. The teeth of this type can be spur, helical or herringbone. • Only one gear may rotate about a single axis
  • 22. Compound Gear Train • For large velocities, compound arrangement is preferred • Two or more gears may rotate about a single axis
  • 23. Planetary Gear Train (Epicyclic Gear Train)
  • 24. Planetary Gear Train… • In this train, the blue gear has six times the diameter of the yellow gear • The size of the red gear is not important because it is just there to reverse the direction of rotation • In this gear system, the yellow gear (the sun) engages all three red gears (the planets) simultaneously • All three are attached to a plate (the planet carrier), and they engage the inside of the blue gear (the ring) instead of the outside.
  • 25. Planetary Gear Train… • Because there are three red gears instead of one, this gear train is extremely rugged. • planetary gear sets is that they can produce different gear ratios depending on which gear you use as the input, which gear you use as the output, and which one you hold still.
  • 26. Planetary Gear Train… • They have higher gear ratios. • They are popular for automatic transmissions in automobiles. • They are also used in bicycles for controlling power of pedaling automatically or manually. • They are also used for power train between internal combustion engine and an electric motor
  • 27. Short Quetions • What is power transmission? • Why gear drives are called positively driven? • What is backlash in gears? • What are the types of gears available? • What is gear train? Why gear trains are used? • Why intermediate gear in simple gear train is called idler? • What is the advantage of using helical gear over spur gear? • List out the applications of gears • Define the term ‘module’ in gear tooth • What is herringbone gear?
  • 28. Essay type questions • With sketch explain various types of gears • With sketch explain three types of gear trains • With neat sketch explain the nomenclature of spur gear • Write the applications, advantages and disadvantages of gear drives