Gear drive

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Gear drive

  1. 1. GEAR DRIVE  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 .
  2. 2.  It transmit exact velocity ratio .  It may be used to transmit large powers  It has high efficiency.  It has reliable service .  It has compact layout Advantages of Gear Drive
  3. 3. Disadvantages of Gear Drive  The manufacture of gears require special tools and equipment  The error in cutting teeth may cause vibration and noise during operation .
  4. 4. Types of 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
  5. 5. External & Internal Gear  An external gear is one with the teeth formed on the outer surface of a cylinder or cone.  Conversely, an internal gear is one with the teeth formed on the inner surface of a cylinder or cone.
  6. 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
  7. 7. Bevel Gear  Bevel gears are useful when the direction of a shaft's rotation needs to be changed  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.
  8. 8.  Hypoid gears resemble spiral bevel gears except the shaft axes do not intersect.  Usually require some of the most viscous types of gear oil to avoid it being extruded from the mating tooth faces.  Which are normally straight cut bevel gears in motor vehicle axles. Hypoid Gear
  9. 9. 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
  10. 10. Rack and Pinion  It is Special case of a spur gear where it is made of infinite diameter so that the pitch surface is a plane .  It is used in a lathe in which the rack transmits motion to the saddle .
  11. 11. Non-Circular Gear  A non-circular gear (NCG) is a special gear design with special characteristics and purpose.  Textile machines, potentiometers, CVTs (continuously variable transmissions), window shade panel drives, mechanical presses, high torque hydraulic engines.
  12. 12. Crown Gear A crown gear can only mesh accurately with another bevel gear
  13. 13. Sun and Planet Gear  A gear train having a relative motion of axes is called a planetary or an epicyclic gear train  Important application of epicyclic gears are in transmission, computing devices, wrists watches, hoists, back gear of lathe etc.
  14. 14. Harmonic Drive Gear  Is a special type of mechanical gear system that can improve certain characteristics compared to traditional gearing systems  typically used in industrial motion control, machine tool, printing machine, robotics and aerospace.  for gear reduction but may also be used to increase rotational speed, or for differential gearing.
  15. 15. 1. Grease lubrication Grease lubrication is suitable for any gear system that is open or enclosed, so long as it runs at low speed. 2. Splash lubrication Splash lubrication is the normal method for lubricating spur, helical, bevel and worm gears. 3. Spray lubrication For the higher speed units (10 to 20 m/s peripheral speed) Lubricant for Gear

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