how the CVT works image

[mlpower]

I couldnt wrap my head around the way the CVT works in the rogue, so I did some googling and found the following image of what I understand to be the inner workings of our CVTs. I definitely learn better with illustrations and this one helped me.

[philipa_240sx]

Well almost....

The animation you posted is actually a toroidal CVT. The Rogue uses a different kind of CVT composed of 2 variable pulleys and a steel belt. It's mfg'd by Jatco (Nissan's affiliate). You can find the animation here:

http://www.jatco.co.jp/ENGLISH/PRODUCTS/s_cvt.html

[casperfun]

I definitely learn better with illustrations and this one helped me.

Well then video would be best..........

http://www.youtube.com/watch?v=MhFK5gfAGpM


Modified by casperfun at 6:22 AM 3/25/2010

[mlpower]

Sorry for the misinformation!! I must have read wakopedia wrong.

Thanks for correcting me. This CVT is all new to me and I want a better understanding. I hope the links you guys posted help.

Thanks again!

[philipa_240sx]

Well then video would be best..........

Modified by casperfun at 6:22 AM 3/25/2010

It's not the same type of CVT... but you get the idea.

If you want to see exactly what the Jatco/Nissan CVT looks like, here is another vid:

http://www.youtube.com/watch?v=6Hc21W9LmYM

[mlpower]

It's not the same type of CVT... but you get the idea.

If you want to see exactly what the Jatco/Nissan CVT looks like, here is another vid:

http://www.youtube.com/watch?v=6Hc21W9LmYM

great clip, but I cannot read Japanese

I actually saw another clip while looking at yours that was really cool. It's of an altima going 0-120. Watch the RPMs really cool the way this works!

Does this mean I can never redline my rogue (not that I would want to)?

http://www.youtube.com/watch?v...lated

[philipa_240sx]

Does this mean I can never redline my rogue (not that I would want to)?

The CVT will not allow a gear ratio that will redline the engine. So it's pretty much impossible.

About the only way to redline is to shift from D to N while the accelerator pedal is held to the floor. There is a fuel cut that will shut down the motor at redline, but a sudden jump in engine rpms will push it above the redline and likely result in some permanent damage.

BTW, on my Alty with the 5spd manual and the same motor, I did redline a couple of times. Not fun. The engine power really drops off above 6000rpm so it's pointless. It's best to stay in the power band from 3000-5500rpm.

[jmbones]

The CVT is basically the same design you will find in any snowmobile and most modern large 4x4 ATV's, except they use rubber belts.

[Elton Noway]

Wow... and all this time I thought the CVT worked like this

[casperfun]

I went under the hood and open my CVT and found this!

[jfowl75]

Terrific animation Noway! And yes it could just as easily be those loompas but am I wrong, aren't the cvt's wonderfully simple? I believe the concept was tried in the 1920's but the components wouldn't hold up.

[kerrton]

Also, here's a summary image of the Jatco CVT:

[philipa_240sx]

I believe the concept was tried in the 1920's but the components wouldn't hold up.

Several important advancements in technology has happened since then:

1) Instead of operating in tension, the CVT belt works on compression. That's right, the belt is actually pushed! Once the belt rounds the drive pulley, all those 'elements' that make up the belt stack together and push the driven pulley.

2) Advancements in metallurgy. The belt needed to be stiff yet flexible. The components need to have steel that is hard enough to wear slowly for long life.

3) Lubrication. The lube needed to work like a 'glue' under heavy load to push the belt yet still lubricate the metal surfaces. Explains why CVT fluid is $15/quart!