Cams

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Cams

  1. 1. Structures and Mechanisms
  2. 2. Cam and Follower • The cam and follower is a device which can convert rotary motion (circular motion) into linear motion (movement in a straight line). Cams Follower Cam Followers (valves)
  3. 3. Cam and Follower follower • The cam can have various shapes. These are know as cam profiles. Pear Heart Cam Circular Drop
  4. 4. Cam and Follower Follower • A follower is a component which is designed to move up and down as it follows the edge of the cam. cam Knife edge Flat foot Off set Roller Follower follower follower follower
  5. 5. Cam and Follower • • The 'bumps' on a cam are called lobes. The square cam illustrated has four lobes, and lifts the follower four times each revolution. Follower Square cam Examples of other rotary cam profiles.
  6. 6. Cam and Follower Examples of a Rotary cams in operation. Control the movement of the engine valves. Cams used in a pump.
  7. 7. Cam and Follower • The linear cam moves backwards and forwards in a reciprocating motion. Cam Follower Linear cam Distance moved by the follower
  8. 8. Cam and Follower • Cams can also be cylindrical in shape • Below a cylindrical cam and roller follower. Cam rise and Fall • The cam follower does not have to move up and down - it can be an oscillating lever as shown above. Max Lift Min Lift

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