Thursday, 26 September 2013

External Gear Pump

External gear pumps are similar in pumping action to internal gear pumps in that two gears come into and out of mesh to produce flow.  However, the external gear pump uses two identical gears rotating against each other -- one gear is driven by a motor and it in turn drives the other gear.  Each gear is supported by a shaft with bearings on both sides of the gear.
1.  As the gears come out of mesh, they create expanding volume on the inlet side of the pump. Liquid flows into the cavity and is trapped by the gear teeth as they rotate.
2.  Liquid travels around the interior of the casing in the pockets between the teeth and the casing -- it does not pass between the gears. 
3.  Finally, the meshing of the gears forces liquid through the outlet port under pressure.
Because the gears are supported on both sides, external gear pumps are quiet-running and are routinely used for high-pressure applications such as hydraulic applications. With no overhung bearing

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Quiz on Gears

This quiz is to test your knowledge
  1. Spur gear design normally begins with selecting this:

    2. Tooth size
    Gear size
    Pitch diameter

  2. The most common geometric form used in gears today is this

    3. Involute profile
    Convolute profie
    Spur circle

  3. This is a curve showing the displacement of the follower as ordinates on a base line that represen

    4. Follower
    Displacement diagram
    Reciprocation chart

  4. Gears are used to do the following for rotating shafts:

    5. Reduce friction
    Reduce cost
    Reduse slip

  5. These gears transmit power between shafts whose axes intersect at any angle:

    6. Worm gears
    Racks
    Bevel gears

  6. The ratio between the speed of the camshaft and the speed of the crankshaft is

    7. 1:1
    1:4
    1:1/4

  7. The function of a torque converter or fluid converter is similar to that of a

    8. Clutch
    Gear box
    Torsion box

  8. The sun gear in the planetary gear system meshes with the

    9. Pinion cage
    Planet pinions
    Ring gear

  9. In gear systems, speed reduction means torque

    10. Stabilization
    Increase
    Both

  10. Spur Gear is

    11. Intersecting gear
    44 Angle gear
    0 angle gear

NOTHING IS EVER BAD AS IT SEEMS AT FIRST..

All the best