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    Discussion in 'The main mechanical design forum' started by MariaNatalia, Aug 23, 2013.

    1. Azougar soufiane

      Azougar soufiane New Member

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      MariaNatalia, you should think about a planetary gearbox, very efficient and provides a very small reduction's ratios, for the mechanism from the pictures above, that could be very helpful, do some researches about it, and contact me just after,
      Soufiane.
       
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    3. Michael Ross

      Michael Ross Well-Known Member

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      If the engine selection is not locked down, you should consider that any motor that has a longer stroke will make more torque. This also has the effect of reducing rotational speed which in turn reduces the speed reduction/torque multiplication necessary.

      The far end of this idea is a hit and miss engine. These are great for a fabrication project.

      http://s608.photobucket.com/user/rudydubya/media/Upshur%20Pics/Finished%20Pictures/Profile.jpg.html


      Speed is not constant.

      2 strokes are very inefficient if this matters to you. But they are simple to build with few moving parts. However the details of fuel delivery, port design, transfer case, exhaust design, etc. are not simple to design though simple to make once the design is solid. On the other hand 4 strokes are more complicated and more costly, but are more efficient and off the shelf choices more varied.
       
    4. MariaNatalia

      MariaNatalia Member

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      Hello Azougar.. thank you for your help! i would love to find a planetary gearbox, however i did a google search and seems to be very hard to find these in my country.
      do you know if this kind of gearbox is something that can be made by a regular mechanic ingeneer?

      thanks

      Nat

       
    5. MariaNatalia

      MariaNatalia Member

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      Hello Michael, thanks for sharing that!!.
      actually in the future i'm planning to make the vehicle with a brushless engine.. i didn't try with the electric engine at first cause i assume that will be harder to achieve the results... so first i want to make it with an oil engine but if it works i'll try with a 1000w engine..

      also i forgot to mention that the weight of the machine should be pretty low (no more than 20lbs) cause this should be fit on a big backpack. so it is a challenge.. Do you know how much an engine like that weight? what displacement is? where can i see the specifications for that kind of engines?

      thank you for your help michael!


       
    6. Michael Ross

      Michael Ross Well-Known Member

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      If you are interested in an electric system, you may want to investigate the products available for radio controlled hobby vehicles and electric bicycles and scooters.

      A kW motor is very powerful. I use an pedal assist tricycle to comute to work (50 miles round trip at 24mph) which has a 750W motor http://www.organictransit.com/

      here are some useful links:
      http://kellycontroller.com/
      http://endless-sphere.com/forums/
      http://www.aliexpress.com/store/pro...OR-E-BIKE-Free-Shipping/328001_821460991.html
      http://www.hobbypartz.com/

      You are not trying to do anything that has not been done for years, so you do not want to invent too many things that already exist
      fRgURt2nZN4
      ayovPr_WjSM
       
    7. MariaNatalia

      MariaNatalia Member

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      Perfect Mike!
      i will check out those links for sure!
      thank you for taking the time to find this info and also for sharing!
      you are great!!

      Nat

       

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