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LEGO models my own creation MOCpages toys shop Continuously Variable Transmission (CVT) with instructions
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Continuously Variable Transmission (CVT) with instructions
About this creation
Continuously Variable Transmission is a transmission type that has infinite speed ratio between two ratio limits (maximum ratio and minimum).

The system is based in two cones conected by other element (usually a belt), and moving this element along the cone you can change the transmission ratio in infinite positions.





It doesn't need clutch to change the ratio, but it have a problem, it cann't have reverse, you need add a transmission reserver.





Obviously the maximum allowed torque is limited by the cone connector.

This transmission is very used in scooters and low fuel consumption cars, as the Toyota Prius, because it can keep the engine in the optimal rpm range.

Based in the original desing I had developed a Lego version. In this model de minimum ratio is 1:0.5 and de maximum ratio 1:2









Note: I had use a big linear actuator but the system only need 4-studs displaciment and you can use a mini-LA (I dont have one...)

It uses two opposing cones, with 4-stud maximum diameter and 2-studs minimum.

You can get other limited ratios using other cones size. 




The cone connect element is a 30.4x17 tyre







With this tyre the maximum allowed torque is 4 Ncm, this is a M motor torque, or a XL motor with 1:3 external ratio torque

A little video:



You can see more pictures here:

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=483927

And donwload step by step instructions here:

http://www.megaupload.com/?d=4LDBKU9Z

For more information please visit sheepo.es

I hope you like it!!!



Comments

  October 2, 2011
a pneumatic engine :P I3 though, don't have enough parts for a v8
 I made it 
  October 1, 2011
Quoting the ant sorry i don't know how much 4 Ncm but what if i added it to a model the size of Nicjasnos Mustang?
This car is not bigger or heavier than muy porsche, and it should work fine. 4Ncm is for exemple a M motor torque(not power), 2 RC motors joint torque in the internal output, or XL motor with 1:3 external ratio... choose your motors ;)
 I like it 
  September 30, 2011
sorry i don't know how much 4 Ncm but what if i added it to a model the size of Nicjasnos Mustang?
 I made it 
  September 30, 2011
Quoting the ant so if i put it into a car the size of your porsche it would fail? or would it hold a little while and then break?
In a car like the Porsche could work perfectly. The only limitation is 4 Ncm at the entrance of transmission.
 I like it 
  September 29, 2011
so if i put it into a car the size of your porsche it would fail? or would it hold a little while and then break?
 I made it 
  September 24, 2011
Quoting the ant i guess it won't hold so well when you add some torque to it, right?
The CVT works well up to 4 Ncm, since then the system loses efficiency and can fail.
 I like it 
  September 24, 2011
i guess it won't hold so well when you add some torque to it, right?
 I like it 
  September 19, 2011
Nice job if only you added this to a technic model
 I like it 
  September 19, 2011
What a great idea! A little on the large side though.
 I like it 
  September 19, 2011
Genius. The advantage of thinking laterally (linearly ?)
 I like it 
  September 19, 2011
Goodness that's crafty... would something like this work is a trial truck?
 I like it 
  September 19, 2011
Wow! I am truly amazed that this could be done with LEGO! Our MINI Cooper has a CVT and it is really fun to drive. Only criticism I have is that the music in the video detracts from the quality of this amazing piece of engineering, as I would have liked to better hear the mechanism working at different speeds.
 I like it 
  September 19, 2011
So simple, and so brilliant. Great job - it works beautifully. 5 stars
 
By Sheepo's Garage
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LEGO models my own creation MOCpages toys shop Continuously Variable Transmission (CVT) with instructions


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