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What do radial bearing and pressure bearing mean in physics?

  1. Jul 3, 2011 #1

    Femme_physics

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    What do "radial bearing" and "pressure bearing" mean in physics?

    (This is NOT a homework question)

    I am told that this board is supported by two bearings: Radial bearing C, and pressure bearing O. Then they write something I can't even begin to translate, it looks as though it's written in really bad Hebrew, and over-technical language for our level. I'll try to translate it:

    The pressure bearing from the cable added to the radial forces the forces acting acting along the y axis.


    http://img683.imageshack.us/img683/4516/thehelle.jpg [Broken]

    What do "radial bearing" and "pressure bearing" mean in physics?
     
    Last edited by a moderator: May 5, 2017
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  3. Jul 4, 2011 #2

    EWH

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    Re: What do "radial bearing" and "pressure bearing" mean in physics?

    I believe a radial bearing is just a standard bearing that supports against radial forces, while a pressure bearing (more often called a thrust bearing) is designed to take a force along the shaft axis as well.
     
  4. Jul 4, 2011 #3
    Re: What do "radial bearing" and "pressure bearing" mean in physics?

    I think EWH is correct. So a pressure bearing would for example be for the shaft of a blender used for baking, and a radial bearing would be for the driveshaft of a car.
     
  5. Jul 4, 2011 #4
    Re: What do "radial bearing" and "pressure bearing" mean in physics?

    To make it more obvious from the picture look at what happens when you put a weight on that platform. The rope between B and D is offset from the Y axis. So the weight will create a force pulling C away from the wall while O is pressed tight against the wall (Though there are many other counter forces as well). Without bearing C it would rotate away from the wall and O is merely being compressed against the wall. Hence the radial and pressure labels.


    Since the distance between O and B is greater than O and A (113.137) the greater the distance between O and D the more free it will be to rotate without the bearings to prevent it. It comes down the the fact that a force exist pulling C away from the wall rotating the platform (radial bearing), but O will not.
     
  6. Jul 5, 2011 #5

    Femme_physics

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    Re: What do "radial bearing" and "pressure bearing" mean in physics?

    Let me see if I get it straight with vector notation

    http://img97.imageshack.us/img97/8921/withyous.jpg [Broken]

    Forget whether it's the right direction or not, that I'll get in calculation. But in terms of numbers of vectors, did I get it right?
     
    Last edited by a moderator: May 5, 2017
  7. Jul 5, 2011 #6

    EWH

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    Re: What do "radial bearing" and "pressure bearing" mean in physics?

    If you are specifying the forces provided by the bearings on the shaft OC, then the vectors at O look correct, but the vectors at C should only be the two perpendicular to the one you drew (xz).
     
  8. Jul 5, 2011 #7

    Femme_physics

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    Re: What do "radial bearing" and "pressure bearing" mean in physics?

    Ah, so radial means it allows movement at Y, not denies movement just at Y. Now
    I get it. Thanks :smile:
     
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