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MECHANISMS - Coggle Diagram

- - - - R- resistance or load which acts at the other end of the bar
        
        d- distance from F to the fulcrum
        
        r- distance from R to the fulcrum
- - - - 2 or more wheela that are in contact . the firts wheel = primary drive wheel, because when it moves, it drives the second= output wheel, causing it to move as well
        
        the ratio between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels. is expressed by the following equation----- N²· D¹= N¹· D²---> D¹:D² = N²:N¹
        
        N= velocities of the wheels D= diameters
    - - 2 pulleys pr wheels. their axles are parallel and they rotate simountaneously due to the effect of the belt
    - - Sets of wheels that have teeth called cogs. the cogs fit into the spaces between the cogs of another wheel, so that one wheel moves the other
        
        N¹-Z²= N²-Z¹ ---> Z¹:Z² = N²:N¹
        
        N= velocities and Z= number of teeths
    - - 2 cogwheels with a parallel axles. they rotate simultaneously by means of a metal chain or a toothed belt streched over both wheels
        
        the relation between the rotation velocities of the wheels depends on the number of teeth on each gear
        
        N1·Z1=N2·Z2-------> Z1:Z2=N1:N2
        
        N= velocities of the wheels Z= number of teeth
    - - system of more than 2 gears, connected together as shown in the diagram. The gear ratio between the drive wheel (I) and the driven wheel (4) depends on the number ol geared teeth m the system
        
        N4: N1= Z1·Z3: Z2·Z4
        
        N= velocities of the dnve wheel and the dnven wheel. Z= e number of teeth
    - - system of pulleys, or wheels, with a belt
        formed by more than two wheels. the gear radio between the drive pulley(1) and the driven pulley(4) depends on the relative size of the pulleys in the system. it's expressed as a function of their diametres
        
        N4:N1 = D1·D3: D2·D4
        
        N= velocities of the drive and driven
        pulleys. D= diameters of wheels
  - - - COSTANT SYSTEM: velocity remains constant
        
        REDUCING SYSTEM: velocity is reduced
- - - - rotary
      - linear
    - - rotary to linear
      - rotary to reciprocating
- - - - rack and pinion system
        
        the ration between the number of rotations of the pinion and the velocity of the movement of the rack is expressed by this equation
        
        L= P·Z·N
        
        L= veloaty of the rack's movement in millimetres per
        minute. P= distance between two consecutive teeth in millimetres. Z= number of teeth in the pinion. N=e number of rotations per minute of the pinion
      - Nut and bolt system
        
        bolt or threaded bar and a nut that has the same
        intenor diameter as the diameter of the bolt.
      - Winch and crank handle
        
        A winch and crank handle system consists of a drum that rotates and a crank handle that allows to pull or lift obiects
        
        F·d= R·r -----> F= R·r:d
    - - crank-link-slider
        
        This is composed of a crank and a rod called a connecting rod or link.
      - crankshaft
        
        This is a set of connecting rods attached to a jointed axle. Each of the
        ioints of the axle acts as a crank.
      - cam
        
        a rotating obiect that pushes a follower as it moves
      - eccentric cam
        
        a wheel with an off- centre rotation axle that doesn't coincide with the centre of its circunference