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Compact CVT manual gear shift
Compact CVT manual gear shift 6×6.5×3 studs, from gearing ratio 1:2 to 2:1
About this creation
My compact CVT manual gear shift model was inspired by Sheepo's linear actuator controlled CVT gear shift. I wanted to simplify and downscale it for smaller scale, non-RC models. Also, important issue was relatively good torque tolerance. I tried to achieve it replacing rubber bands of Sheepo's model with tension of ABS frame itself, to generate sufficient friction between the 2 cone wheels and the rubberized friction wheel. The disadvantage of this solution that the lenght of the unit is not integer number of studs. It dimensions are 6 studs height × 6.5 studs lenght × 3 studs width. It can shift continuosly from gearing ratio 1:2 to 2:1, pushing the yellow lever forward/backward, which slides friction wheel with the help of a fork. Friction wheel can run and slide freely on the oblique axis. Of course, this CVT has no reverse gear, but using reversable electric motor drive, it is not an issue.


Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  January 16, 2015
Quoting - Dan and Matthew - Excellent design! Although it’s on a much larger scale, you might be interested in Oton Ribic’s approach to CVTs: http://www.legoism.info/2012/12/chain-based-cvt.html.
Thanks. My purpose was to create a really small CVT.
 I like it 
  January 15, 2015
Excellent design! Although it’s on a much larger scale, you might be interested in Oton Ribic’s approach to CVTs: http://www.legoism.info/2012/12/chain-based-cvt.html.
 I made it 
  January 8, 2015
Quoting Jeremy McCreary Gabor, A LEGO buddy with a CVT in his car recently decided to build one. A search for examples brought me to yours -- the cleverest I've seen yet. Great design, as always. Jeremy
Thanks. In the meantime, I recognized that intead of using small diameter rubber tyre with separate hub and sloped axis, professional double-cone based CVTs use a large diameter rubber tyre WITHOUT hub and separate axis: one of the cones is inside the tyre, the other presses from the outside. It gives way better friction than small tyre. Hovewer its correct positioning at gear shift is difficult: it requires at least 2 driving rollers instead of the current simple sliding fork. So it wont be so compact.
 I like it 
  January 7, 2015
Gabor, A LEGO buddy with a CVT in his car recently decided to build one. A search for examples brought me to yours -- the cleverest I've seen yet. Great design, as always. Jeremy
 I made it 
  November 1, 2013
Quoting Nick Barrett Looks like it'll work well. Thanks for sharing.
You are welcome.
 I like it 
  October 31, 2013
Looks like it'll work well. Thanks for sharing.
 I made it 
  October 31, 2013
Quoting Technic Man Really good! 5/5
Thanks.
 I like it 
  October 30, 2013
Really good! 5/5
 I made it 
  October 30, 2013
Quoting Joost Cumps Genius!!! Can't wait to see an application
Thanks. I will try to put togeteher this CVT, 3 compact Torsen differentials (my earlier design), and portal axis + king pin suspension in a really compact 4WD vehicle. But that will be a long and painful development story.
 I made it 
  October 30, 2013
Quoting XY EZ Really great! But wouldn't you loose torque with this, because the cones are very slippery? Anyway, really good idea and job, nice alternative to cogwheels! 5/5 8-)
Thanks. The basic idea is Sheepo's, I just tried downscale it. In my experience (originated from Mindstorms tracks) you can reduce slip adding some honey. However, this solution is very sensitive to humidity level: there is a medium level, when it reduces slip maximally.
 I made it 
  October 30, 2013
Quoting Gabor Horvath Jó kicsi lett! Az eredeti Sheepo-féléről tudsz egy linket dobni?
Köszi, itt küldöm: http://www.mocpages.com/moc.php/287990
 I like it 
  October 30, 2013
Genius!!! Can't wait to see an application
 I like it 
  October 30, 2013
Really great! But wouldn't you loose torque with this, because the cones are very slippery? Anyway, really good idea and job, nice alternative to cogwheels! 5/5 8-)
 I like it 
  October 30, 2013
Jó kicsi lett! Az eredeti Sheepo-féléről tudsz egy linket dobni?
 I made it 
  October 30, 2013
Quoting Matt Bace Very impressive! Do you have an application in mind for this CVT?
Thanks. Yes, I just thinking about a very compact 4WD electric driven Jeep, which can be loaded into the cargo/bomb bay of my SkyTank heavy battlefield helicopter curently under construction. It has cargo bay 17 studs wide, 16 studs tall, and 44 studs long. That means a big challenge.
 I like it 
  October 30, 2013
Very impressive! Do you have an application in mind for this CVT?
 
By Gabor Pauler
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LEGO models my own creation MOCpages toys shop Compact CVT manual gear shift


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