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Thread: Rocker Pivot Bearings

  1. #11
    I like the Nadella bearings but they arn't cheep.


    I bet if you played your cards right you could piece together the right needle (or roller) bearing and thrust bearing for less.

    My thought is that a combination of a needle bearing and a ball bearing would be a good way to go.

  2. #12
    I was advised away from needle bearings by a tutor because apperently, they don't like resisting moments. I eventually setteld on a double row deep grove ball bearing. It has an advantage over single row bearings because you only need one of them and therefore require no spacers, and is also more than twice the strength of an equivelent size single row.
    David

    Torotrak (Development) Ltd
    University of Newcastle upon Tyne Graduate
    Newcastle Racing 2003-2006

  3. #13
    We've been using INA # NKIB 5901 for a couple years now - no problems!

    They are a combination needle roller and angular ball bearing.
    --
    Spencer
    UBC Formula SAE
    www.formulaubc.com

  4. #14
    I am currently exploring the option of running an oil impregnated bronze bushing. Do you guys have any experience with bushings or does most everyone run bearings?

    Thanks,

  5. #15
    We used the oil impregnated bronze bushings in our 04 car.... still have yet to have any trouble with them, and they are 1/4" ID's

    we've ran our car at nearly all the local auto-x's too.... so, theres plenty of time on them
    04 - Engine Team
    05 - Team Captain
    Old Dominion University - Norfolk, VA

  6. #16
    We used bronze bushings on our first car (last year). At the front, we had pullrods, dampers and bell cranks all in the same plane with dampers under the drivers legs - only possible because our car was huge. The bronze bushings were a little stiff but worked fine because they only saw radial loads. The car hasn't had many miles on it but the bushings are still quite worn. They'll easilly last through a competition weekend but as for a full year with testing etc, they might need replacing.

    However, at the back, the pullrods were dampers and pullrods were severly out of plane (my fault for rushing the design - litterally a week before competition) putting the bellcrank into bending and putting all sorts of loads through the bushings causing them to sieze up regularly. This year i've gone for bearings because i don't want to risk any siezing even though the axial loads will be far less. I'm just not taking any chances.

    If your confident in your overall design and will have the time to test them thoroughly, then i couldn't see a problem with the bushings. Just make sure you have another solution to fall back on in case they don't work.

    We've been using INA # NKIB 5901 for a couple years now - no problems!
    They were the bearings i was looking at until my tutor pointed out that to resit the moment produced by the pushrod, it would be the edges of the rollers which would be taking the loads. Which way do you orientate the bearings (ball at top or bottom)? How much do they cost? They look quite specialised so i expect they're quite expensive.
    David

    Torotrak (Development) Ltd
    University of Newcastle upon Tyne Graduate
    Newcastle Racing 2003-2006

  7. #17
    hi
    maybe it's too obvious to see but i can't understand how this particular rocker mechanisem works.
    using soildworks building the assembly of the mechanism shows that if the rocker pivot and the pivot of the chassis/shock are not parallel nothing will move,but here it seems they are not parralel,can someone pls tell me what i'm missing.

    last year in mech engineering
    Ben-Gurion UNI in Beer Sheva
    Israel

  8. #18
    Reply
    Reply
    for some reason it didn't loaded the picture fo here it is.
    http://engsoc.queensu.ca/formulacar/...bum21/IMG_0061
    last year in mech engineering
    Ben-Gurion UNI in Beer Sheva
    Israel

  9. #19
    Originally posted by Omer:
    hi
    maybe it's too obvious to see but i can't understand how this particular rocker mechanisem works.
    using soildworks building the assembly of the mechanism shows that if the rocker pivot and the pivot of the chassis/shock are not parallel nothing will move,but here it seems they are not parralel,can someone pls tell me what i'm missing.

    The damper has a spherical bearing in it so it has 5 degrees of freedom to it.

  10. #20
    thanks
    thats expalins it,we have fox shocks without those bearings.

    from the pictures you cant see the bearing.
    last year in mech engineering
    Ben-Gurion UNI in Beer Sheva
    Israel

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