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MECHANISMS - Coggle Diagram

- - - - Each time the screw rotates, the gear moves forward as many teeth as there are grooves in the screw, usually a small number I, 2 or 3
        
        This is used to reduce velocity as well as functioning as a brake system.
        
        N„„ , and N „„ a re the velocities of the wheel and of the screw
        
        Z, „ is the number of grooves of the screw and Z„„, is the number
        of teeth of the wheel
  - - - The chain transmits the rotary mouon of axle I to axle 2 by means of
        
        gears I and 2, and the two gears rotate in the same direction
        
        This system transmits greater forces without losing velocity because the chain is attached to the gear teeth so there's no slippage between the chain and the wheel.
        
        To calculate the ratio between the rotation velocity of the drive wheel (I) and the driven wheel (2), use the same formula as for gear mechanisms
        
        Z a nd Z, are the number of teeth
        
        N an d N, are the velocities of the corresponding wheels
  - - - The rotation of one axle is transmitted to the other through the
        connected pulleys.
  - - - The rotary motion ofthe first wheel ( I) doves the second wheel (2), and so on.
        
        In this system, the rotary movement of the first axle is transmitted to the second by means of wheels I and 2.
        
        Wheel 3 rotates with the same velocity as wheel 2 and doves wheel 4, to which it's connected
        
        Each connected geared wheel rotates m the opposite direction to the wheel it's attached to
        
        N, and N, are the velocities of the dnve wheel and the dnven wheel.
        
        Z , Z,, Z, and Z„are the number of teeth on the wheels.
  - - - N, D, = N, D
        
        N1 and N2 are the velocities of the primary dmve wheel and the
        output wheeL
        
        These velomties are expressed tn revolutions per minute (rpmh
        
        D, and D, are the corresponding diameters
        
        They are expressed in units of length: usually millimetres
  - - - Pulleys 2 and 3 rotate at the same velooty
        
        The motion of pulley 3 is transmitted to pulley 4 by the belt that connects them.
        
        All the wheels rotate m the same direction
        
        Iv i and N, are the respective velocities of the drive and driven
        pulleys.
        
        De Dn Di and D, are the diameters of each wheel.
- - - - TYPES
        
        En la palanca de segunda clase, la resistencia se encuentra entre la potencia y el fulcro. Se caracteriza en que la potencia es siempre menor que la resistencia, aunque a costa de disminuir la velocidad transmitida y la distancia recorrida por la resistencia.
        
        En la palanca de tercera clase, la potencia se encuentra entre la resistencia y el fulcro. Se caracteriza en que la fuerza aplicada es mayor que la resultante; y se utiliza cuando lo que se requiere es ampliar la velocidad transmitida a un objeto o la distancia recorrida por él.
        
        En la palanca de primera clase, el fulcro se encuentra situado entre la potencia y la resistencia. Se caracteriza en que la potencia puede ser menor que la resistencia, aunque a costa de disminuir la velocidad transmitida y la distancia recorrida por la resistencia. Para que esto suceda, el brazo de potencia Bp ha de ser mayor que el brazo de resistencia Br.