CVT vs HST

[Duffster]

there is alot of information in this thread thats not correct...I don't have time to set things straight right now.

Please explain.

I do know that they use CVT on some combines. My neighbor bought a used Gleaner combine last fall and he let me crawl around inside it. I was surprised to see a giant pulley and CVT belt on a piece of equipment this large. He gave me a ride in this combine while he was harvesting last fall. It's a nice combine and he is very pleased with it. This is the first post about tractor CVT's I have seen on TBN. I would very much like to read more.

Are you sure that was driving the wheels?

 

[Pops15]

I have a friend thats an engineer for a heavy equipment manufacturer. I asked him about CVT. He speaks very highly of the concept. He described several different types. The best designs aren't available on CUTs because they would be cost prohibitive.
He also said the real benefit of CVT is fuel economy, especially when an engine is designed to run at a constant, specified RPM. He thinks that in time CVT will become much more common.

 

[dieselfreak]

I do know that they use CVT on some combines. My neighbor bought a used Gleaner combine last fall and he let me crawl around inside it. I was surprised to see a giant pulley and CVT belt on a piece of equipment this large. He gave me a ride in this combine while he was harvesting last fall. It's a nice combine and he is very pleased with it. This is the first post about tractor CVT's I have seen on TBN. I would very much like to read more.

Combines are hydrostatic, not CVT.

df.

 

[whistlepig]

Please explain.



Are you sure that was driving the wheels?

To tell you the truth I can't say for sure. I asked the owner if the CVT pulley set up was the transmission drive and he said yes. Perhaps neither one of us knew what we are talking about. I am out of my league on this subject and have more to learn than to share.

 

[magicheater]

The new Boomer 8N has a cvt tranny. I may have to go drive one.

 

[SPYDERLK]

Boomer 8N is very interesting. I looked thru the specs. Everything good til I saw it didnt have independent brakes. No thanks.
larry

 

[tsteahr]

Boomer 8N is very interesting. I looked thru the specs. Everything good til I saw it didnt have independent brakes. No thanks.
larry

Larry, I remember there was a poster here on TBN that mentioned a split brake "kit" was available for the 8N. I don't know that it is true or not, but it might be worth asking a knowledgeable dealer if that is the deal breaker for you...

 

[SPYDERLK]

Larry, I remember there was a poster here on TBN that mentioned a split brake "kit" was available for the 8N. I don't know that it is true or not, but it might be worth asking a knowledgeable dealer if that is the deal breaker for you...

YES! Ill check that out.
larry

 

[Pops15]

Boomer 8N is very interesting. I looked thru the specs. Everything good til I saw it didnt have independent brakes. No thanks.
larry

Go to New Holland Ag website. Click on "parts & service", select "search for parts", type in "boomer 8n" in the search box, click search, click on "boomer 8n tractor", click on "transmission", scroll down and you'll find a listing for the dual brake pedal kit.

 

[KWentling]

there is alot of information in this thread thats not correct...I don't have time to set things straight right now.

Absolutely agree with you on that. I'm no expert on them but from what I understand they are very efficient. Speed is controlled by variably rotating the ring gear of a planetary set with a hydraulic motor. Power input is on the sun pinion and power out is from the carrier of the planet gears. Full power is available directly through the planetarys. They appear to be pretty simple to me. Not sure where the high pressures would be needed. Certainly not for the hydraulic motor as it is only for speed regulation, not power. Don't remember if there are hydraulic clutches involved, but if so they would not need more than a couple hundred PSI. Hopefully someone with more knowledge can shed more light on this subject.

Kim