Gears, Gears and More Gears 2).pdf¢  2020-04-26¢  Gears Gear Speed :-...

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Transcript of Gears, Gears and More Gears 2).pdf¢  2020-04-26¢  Gears Gear Speed :-...

  • Gears, Gears and More Gears

    http://www.nwginc.com/

  • What is a gear?

    A gear is a wheel with teeth that mesh together with other gears.

    Gears change the • speed • torque (rot. force) • direction of rotating axles.

  • Different types of gears

    Spur gears

    Belts & PulleysBevel gears

    Idler gears Worm gears

  • Gear Motion

    If this were my “Driver

    Gear,” it would be

    causing the motion

    Thus the “Driven Gear”

    would be compelled to move

  • Where Do You Find a

    Simple Gear Train?

    Two meshed gears

    will rotate in

    opposite directions.

    Watch gears

    11. Found in:

    – Watch

    – Sewing Machine

    – Motor

  • Where Do You Find a

    Simple Gear Train with

    Idler?

    Two meshed gears will rotate

    in opposite directions.

    An Idler Gear allows the

    drive and driven gears to

    rotate in the same direction.

    8. Found in - Paper Transport Rollers

  • Gears

     Generally, the Gear Ratio is

    calculated by counting the teeth of

    the two gears, and applying the

    following formula:

    Gear ratio = Number of teeth on driven gear

    Number of teeth on driver (drive) gear

    Gear Ratio

  • Gear Ratio….continued

    Driver (Input) Driver (Input)

    Driven (Output)

    Driven (Output)

  • Gears Gear Ratio - Calculation

    A 100 tooth gear drives a

    25 tooth gear. Calculate the

    gear ratio for the meshing

    teeth.

    Gear ratio = Number of teeth on driven gear

    Number of teeth on driver gear

    Gear ratio = driven 25 = 1

    driver 100 4

    This is written as 1:4 Or .25

  • Important

    Calculations

    Work Done = Force x Distance moved in the direction of the

    force

    Power = Total Time Taken

    Total Work Done

    Efficiency % = Power Output

    Power Input

    Friction: - Resists the movement of one surface over another

    X 100

    Efficiency = Mechanical advantage

    Velocity ratio

  • Gears Gear Speed :- Calculation

    A motor gear has 28

    teeth and revolves at 100

    rev/min. The driven gear

    has 10 teeth. What is its

    rotational speed?

    Speed of driven gear = Number of teeth on driver gear x 100

    Number of teeth on driven gear

    Speed of driven gear = driver = 28 x 100 = 280 rev/min

    driven 10

    28 teeth,

    driver

    10 teeth,

    driven