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MECHANISM - Coggle Diagram

- - - - The ratio between the number of rotations of the pinion and the velocity of the movement of the rack is expressed by this equation:L= P 2 N
    - - This consists of a bolt or threaded bar and a nut that has the same interior diameter as the diameter of the bolt.
        Uses: presses, taps, car jacks, screw tops for bottles
    - - A crank is a bar attached to an axle that is used to turn it
        A winch and crank handle system consists of a drum that rotates and a crank handle that allows to pull or lift obiects
        The effort needed to turn the winch is less than it would be if we tried to turn it without the crank handle
  - - - This is a set of connecting rods attached to a jointed axle. Each of the joints of the axle acts as a crank. Uses; combustion engines and sewing machines
    - - This is basically a rotating object that pushes a follower as it moves
        Uses; combustion enfpnes (it regulates the automatic opening and closing of the valves that let fuel and gases in and out), automatic systems
    - - This is composed of a crank and a rod called a connecting rod or link. Uses: internal combustion engmes, windscreen wipers and machine tools
    - - This consists of a wheel with an off centre rotation axle that doesn't coincide with the centre of its circumference
- - - - Worm gear
        
        Nwheels---NscrewXZgrooves:Zwheel
      - Gear mechanisms and cogwheels
        
        N, Z ,=N ,.Z------Z1:Z2=N1:N2
      - gear mechanisms with a chain
        
        N, Z, = N, Z,-----Z1:Z2=N1:N2
      - Gear train
        
        N4:N1=Z1XZ3:Z2XZ4
      - Pulleys with belt
        
        They consist of two pulleys or wheels that are certain distance apart
      - Pulley trains with belts
        
        N4:N1=D1XD3:D2XD4
      - Friction drives
        
        N, D, = N, D------D1:S2=N1:N2
- - - - Is a wheel that has a groove around it into a rope, chains por belt fits
    - - Is a rigid bar that is suported by a fulcrum
    - - This is usually called bñlock and takle
    - - Is a set of two pulleys
- - - - • By traction. The spinnig is stretched, in a bed frame for example.
      - By torsion. The spinnig is twisted, in a clothes peg for example
      - By compression. The spinnig is compressed, in a chair for example
    - - Clutches are mechanisms that allow axles or shafts to be connected or separated
      - Fixed connections are used to make permanent connections
        between axles and shafts
      - Movable connections are used to connect shafts that can move
        along the axle or at an angle to each other.
    - - The most typical mechanism of this type is the ratchet
        
        Band and brakes consist of a metal band that puts pressure on a drum attached to the axle of the oblect we want to slow down.
        
        Drum brakes include one or two brake shoes that come into
        contact with the drum.
        
        Disc brakes consist of pads and a disc anached to the oblect that we want to slow down
    - - In bushings the axle or the shaft is inserted in a plain circular piece that is placed inside a housing to provide a bearing surface.
        
        Be arings are made up of two concentric nngs with balls or rollers between them.