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Rotary Motion

Rotary Motion. A Pulley Mechanism uses rotary motion to transmit rotary motion between two parallel shafts. Mechanisms using Rotary Motion. Pulley mechanisms can be used to increase or decrease rotary velocity. Velocity Ratio. Distance moved by Effort. Velocity Ratio = .

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Rotary Motion

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  1. Rotary Motion A Pulley Mechanism uses rotary motion to transmit rotary motion between two parallel shafts.

  2. Mechanisms using Rotary Motion

  3. Pulley mechanisms can be used to increase or decrease rotary velocity

  4. Velocity Ratio Distance moved by Effort • Velocity Ratio = Distance moved by Load Velocity Ratio = Distance moved by the driver pulley Distance moved by the driven pulley Diameter of Driven Pulley • Velocity Ratio = Diameter of Driver Pulley

  5. Velocity Ratio Pulley Shaft Rotary Velocities can be calculated using the following formula rotary velocity of driven pulley x diameter of driven pulley = rotary velocity of driver pulley x diameter of driver pulley rotary velocity of driver pulley x diameter of driver pulley • rotary velocity of driven pulley = diameter of driven pulley

  6. What is the rotary velocity of the driven pulley shaft? rotary velocity of driver pulley x diameter of driver pulley • rotary velocity of driven pulley = diameter of driven pulley 450 x 30 = revs/min 90 = 150 revs/min

  7. Pulleys and Belts Vee pulley and section through a vee pulley and belt A section through a grooved pulley and round belt Stepped cone pulleys provide a range of shaft speeds

  8. Flat belts and pulleys A section through a flat pulley and belt Jockey pulley in use Flat belt in use on a threshing machine

  9. Chains and sprockets Bicycle chain and sprockets Graphical symbols

  10. Velocity Ratio = number of teeth on the driven sprocket number of teeth on the driver sprocket 12 • = 36 • = 1 : 3

  11. Example

  12. Pulleys and Lifting Devices The pulley is a form of Class 1 lever

  13. Movable single pulley

  14. Pulleys Distance moved by Effort • Velocity Ratio = Distance moved by Load • Velocity Ratio = the number of rope sections that support the load

  15. Two Pulley System Distance moved by Effort • Velocity Ratio = Distance moved by Load 2x • Velocity Ratio = x Velocity Ratio = 2:1

  16. Four Pulley System Distance moved by Effort • Velocity Ratio = Distance moved by Load 4x • Velocity Ratio = x Velocity Ratio = 4:1

  17. Cams

  18. Cams

  19. Uses Pear shaped cams are used in valve control mechanisms

  20. Cams used in a four cylinder engine

  21. Cam motions

  22. Types of cam follower

  23. Types of cam follower

  24. Springs are used to keep the follower in contact with the cam

  25. Cam Profiles

  26. Displacement graph for a pear shaped cam

  27. Displacement Graphs

  28. Bearings

  29. Thrust Bearings

  30. Bearings

  31. Bearings • Bronze • Nylon • PTFE • Air • White metal • Cast Iron • Sintered

  32. Gears

  33. Gears Gears are not only used to transmit motion. They are also used to transmit force.

  34. Gears Number of teeth on the driven gear • Mechanical Advantage = Number of teeth on the driver gear Number of teeth on the driven gear • Velocity Ratio = Gear Ratio = Number of teeth on the driver gear

  35. Gears

  36. Gears Product of teeth on the driven gears • Gear Ratio = Product of teeth on the driver gears

  37. Gears

  38. Gears

  39. Gears

  40. Gears

  41. Basic Gear Geometry http://www.sdp-si.com/D190/PDF/D190T25.PDF

  42. The inclined plane

  43. The inclined plane

  44. The inclined plane  Effort required to pull trolley up slope F = effort E F = 1000 x sin F = 1000 x 0.01 F = 10N E = 10N sin = 1/100 = 0.01 M.A. = 1000/10 = 100 Follow link to see effects of steeper incline: http://lectureonline.cl.msu.edu/~mmp/applist/si/plane.htm

  45. The screw thread

  46. Screw thread terms

  47. Screw thread forms

  48. Screw thread forms

  49. Screw thread forms

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