• Welcome to engineeringclicks.com
  • Two speed gear box for bicycles???

    Discussion in 'The main mechanical design forum' started by jawnn, Feb 23, 2015.

    1. jawnn

      jawnn Well-Known Member

      Joined:
      Jan 2012
      Posts:
      60
      Likes Received:
      0
      I have been trying to figure out how to build a mid drive for a bicycle that is shiftable between 2 or 3 speed gears for steep hill climbing. Mostly because the bike will weigh up to 500lbs or more, fully loaded with cargo.


      I will probably need to use a 409mm rim pulley on the drive wheel, hopefully a 24 inch wheel/tire,at maybe 10mph on a 9% grade.


      I though of using a Sturmy-Archer 3 speed hub. But that is just not strong enough to take the amount of torque needed. So I ham hoping that some one can direct me to a small gear box that will be strong enough, and tell me how to rig a clutch if needed.


      Is there such a thing as a centrifugal expansion clutch; probably not good for slow rpm???
      Is there a gear box that doesn't need a clutch? With planetary gears?
       
      Last edited: Feb 23, 2015
    2.  
    3. jawnn

      jawnn Well-Known Member

      Joined:
      Jan 2012
      Posts:
      60
      Likes Received:
      0
      OK maybe I should find another place to ask this. Not endless sphere, they don't know any thing.
       

    Share This Page