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Thread: Citroen WRT

  1. #441
    Senior Member itix's Avatar
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    Quote Originally Posted by macebig View Post
    An interesting read on a torque split prototype transmission and diff:https://rallygroupbshrine.org/group-...p-s-prototype/
    Not sure if you were replying to me but that doesn't really go into technical details. I was looking for a mechanical explanation how more force could go out one pinion gear rather than the other when the spider gear should put equal force on both when rotating together with the ring gear.

  2. #442
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    Planetary gears arrangement give torque split options other than 50:50. Normal spider gears give exactly 50:50

  3. #443
    Senior Member itix's Avatar
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    Quote Originally Posted by fecksfx View Post
    Planetary gears arrangement give torque split options other than 50:50. Normal spider gears give exactly 50:50
    Thanks, didn't know about them! much appreciated!

  4. #444
    Senior Member Mirek's Avatar
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    Quote Originally Posted by Sulland View Post
    What has he done before this job?
    https://fr.linkedin.com/in/christophe-besse-24586846
    Stupid is as stupid does. Forrest Gump

  5. Likes: Rally Power (4th July 2017)
  6. #445
    Senior Member NickRally's Avatar
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    Quote Originally Posted by itix View Post
    Thanks, didn't know about them! much appreciated!
    itix, below are couple of simple images I sketched, to give you an idea how an asymmetrical diff can physically look. Most asymmetric diffs actually do not use this arrangement, but this is a simple way of representing an asymmetric diff and should you decide to use such simple design in your vehicle, it will still perform such function.

    So here it is starting with an image of symmetric diff for reference:



    And the asymmetric one:



    You can see how in the asymmetric diff, one of the side gears is smaller than the other which would result in smaller torque being applied to the shaft connected to that side gear.
    Last edited by NickRally; 5th July 2017 at 00:35.

  7. Likes: OldF (7th July 2017)
  8. #446
    Senior Member OldF's Avatar
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    Nick, that’s a solution I’ve never seen before. Does such differential actually exist?



    Audi has a nice looking solution for torque split. This crown gear differential has a torque split front/rear = 40/60. The rear axle is rotated with a bigger diameter/radius than the front axle and therefore get more torque.

    http://www.autozine.org/technical_sc...ion/4WD_1.html



    A video of how it works.

    https://www.youtube.com/watch?v=xZ9x9jHkTrg



    The figure on page 311 explains the torque split of a planetary differential (Old Ford with a front/rear torque split 34/66).

    https://books.google.fi/books?id=2_Q...20diff&f=false



    Mitsubishi 3000GT AWD System http://www.stealth316.com/2-awd3.htm



    “Don’t eat the yellow snow” Frank Zappa

  9. #447
    Senior Member KKS's Avatar
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    Quote Originally Posted by AnttiL View Post
    The aim for the 2017 season was to win races. Is that still the case?

    "The priority now is to prepare for 2018. Some of the upgrades will need several months of development work and they won't be ready to be introduced until the start of next season. That doesn't mean that we won't win any more events in 2017. At the Tour de Corse, we showed the performance level of the C3 WRC on tarmac… However, I have asked the engineers to focus on development of the car, rather than on specific settings for each rally."
    Prepare to 2018? How? Let same engineers come to same drawing-desk with same philosophy? For what reason it should be something rather than C3 again?

    I think that they must found a problem of C3 and a solution. Test at 2017 rallies and if it works - it's make a car a way faster, even to 2018 year.

    They are "prepare" with same approach with same stuff and we see what kind of results they have

  10. #448
    Senior Member Sulland's Avatar
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    So he has been there, and done that!

  11. #449
    Senior Member NickRally's Avatar
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    Quote Originally Posted by OldF View Post
    Nick, that’s a solution I’ve never seen before. Does such differential actually exist?



    Audi has a nice looking solution for torque split. This crown gear differential has a torque split front/rear = 40/60. The rear axle is rotated with a bigger diameter/radius than the front axle and therefore get more torque.

    http://www.autozine.org/technical_sc...ion/4WD_1.html



    A video of how it works.

    https://www.youtube.com/watch?v=xZ9x9jHkTrg



    The figure on page 311 explains the torque split of a planetary differential (Old Ford with a front/rear torque split 34/66).

    https://books.google.fi/books?id=2_Q...20diff&f=false



    Mitsubishi 3000GT AWD System http://www.stealth316.com/2-awd3.htm



    Hi OldF, yes I have seen one many many years ago, though they are not popular at all, but I found this scheme useful for visualizing the principal of asymmetric diff as it can be directly compared to a symmetric one.

  12. #450
    Senior Member itix's Avatar
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    Quote Originally Posted by NickRally View Post
    itix, below are couple of simple images I sketched, to give you an idea how an asymmetrical diff can physically look. Most asymmetric diffs actually do not use this arrangement, but this is a simple way of representing an asymmetric diff and should you decide to use such simple design in your vehicle, it will still perform such function.

    So here it is starting with an image of symmetric diff for reference:



    And the asymmetric one:



    You can see how in the asymmetric diff, one of the side gears is smaller than the other which would result in smaller torque being applied to the shaft connected to that side gear.
    That makes sense, thanks a bunch!
    The larger pinion gear on one side would create a larger torque due to its larger radius.

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