Lego Continuously Variable Transmission CVT

More at http://www.nico71.fr .Based on modified version of Zblj's Transmission. This CVT enables a variation of the speed (and the torque) from 40rpm to 200 (1/5, 1,1) with constant speed for the motor (200rpm). This device is on the way to be included in a lego car. The two mechanical tachometers show respectively the speed of the motor and the speed of the output.

Category:

Science & Technology

Tags:

• Lego
• Continuously
• Variable
• Transmission
• Nico71
• Car
• gearbox
• Automobile
• Engine
• Motion

[skinsofarmor]

use less powerful motor like the Medium motor

[nico71240]

@skinsofarmor Why ?

[35Racerboy]

Nico, when implementing this into your car, how will it work? because you have the input (motor), the output (would normally be the rear axle), and the "resistor", in the video that is what you are holding in your hand. The resistor has to be attached to the rear to work.

[nico71240]

@35Racerboy No, in fact the resistor is the rear axle, when the car goes on hill, the rear axle has a resistance and the gearbox switch the ratio because of the torque. I have tested the CVT on a vehicle and it does't work well. If the model is to big, the pins constantly slips and the vehicle doesnt move. If I put a hard fricition switch, the CVT will never switch the ratio. I think this type of friction gearbox is only suitable for light moc.

[skinsofarmor]

so it is more reactive

awesome creation & vid  btw.

[WiztotheIzzard]

Looks fantastic! Have you seen the work Jorrien and I had done a while back? He has his own CVT models and research on his site, as well as a few models of my own.

Friction based CVTs work well for their purpose- Change in load applied to the output can select a lower ratio, but very much work is lost due to friction! That, and there is no real reasonable manual selection of ratios- Your work is very nice, you should try a more complex model!

lego.roerei.nl/index-transmiss­ions-main.htm

[Nasirdude123]

You should make a monster truck

[35Racerboy]

Very nice! I will try to build it using the instructions now up on your site. Maybe I'll build my ole' off-road truck that I had and implement this into it. I'll have to do some testing :P

Also put some kind of pad with a rack and scroll gear to apply steady pressure to the output shaft instead of wearing out your fingers! You should hook up one of your LPEs to that and make your own Dynamometer!

[legoclockfreak710]

hay man! 1lamasaurus is having a creation contest! you should enter!!!

[Maclman1]

genius. i like the tachs