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Seneca Kansas 66538 | Was watching some videos and came across this one that explains the operation of the CVT transmission in Fendt, Massey, Agco, and Challenger tractors. Very simple and durable system. I would like it if someone could post a video of the exploded view for the Deere and CaseIH IVT as well. It has been explained to me that the Agco transmission can achieve a 45 degree angle on their hydraulic motors which also allows them to have a completely variable transmission with no clutch packs to shift, which makes it so simple and durable.
http://www.youtube.com/watch?v=dgtIKMAjvFI
Edited by Silver Shoes 8/31/2013 07:17
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Belwood, Ontario | They have the patent on the design of the piston, they sold the basic concept of the cvt to Deere and case but not that part which requires them to still use clutch packs
If you get to any bigger farm shows AGCO usually has a cut away version of a working cvt on display |
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Hazelton, Kansas | Silver,
A few years back, Dr. Karl Renius assembled a lecture for ASABE. It is fairly thorough, so it may tell you more than you want to know.
Try this.
https://elibrary.asabe.org/data/pdf/6/cvtt2005/lectureseries29rev.pd...
Regards.
MDS
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SC Iowa | Magnum CVT http://www.youtube.com/watch?v=xhmN_CwB9B8#t=13 |
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Wi | sprayertech - 8/31/2013 06:21 They have the patent on the design of the piston, they sold the basic concept of the cvt to Deere and case but not that part which requires them to still use clutch packs If you get to any bigger farm shows AGCO usually has a cut away version of a working cvt on display
I could be wrong but I am fairly positive they didn't sell anything to anyone. Stehyr's CVT(CNH) has been around for quite awhile, ZF builds Deere's midsize IVTs, or at least they always did.
Fendts patent is on the stepless part, the 45* swing on the motors and variable displacement pump that allows them to go from 0-60kph seemlessly. The who power split/planetary drive concept has been around much much longer and I don't really think anyone can patent that. Toyota uses the same concept in their hybrids.
Silver Shoes - 8/31/2013 06:16 Was watching some videos and came across this one that explains the operation of the CVT transmission in Fendt, Massey, Agco, and Challenger tractors. Very simple and durable system. I would like it if someone could post a video of the exploded view for the Deere and CaseIH IVT as well. It has been explained to me that the Agco transmission can achieve a 45 degree angle on their hydraulic motors which also allows them to have a completely variable transmission with no clutch packs to shift, which makes it so simple and durable. http://www.youtube.com/watch?v=dgtIKMAjvFI
The motors can swing 45* as does the variable piston pump. They simply swing the pump the opposite direction to get reverse. Their patent basically covers the swing of the pump/motors IIRC, that is what prevents other companies from being able to have a completely stepless transmission from 0-60kph. Now having multiple ranges allows you to keep the cvt in a more efficient operating rane (as speed increases power is transmissitted more mechanically than hydraulically), however having to actually shift them using clutchpacks like the other versions creates wear points and shock loads. The shock load is the big one, if you look at the planetary gearset on the Fendt, its tiny but it does not need to be large as it is always under constant load.
Here is a Deere video
http://www.youtube.com/watch?v=IkfOThD4a7o
Here is a CNH video.
http://www.youtube.com/watch?v=xhmN_CwB9B8
Edited by durallymax 8/31/2013 15:17
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SC Iowa | If you study the Case CVT it is a very interesting design, it does have forward-reverse clutch packs on the input side of the CVT (so low torque). When it changes range clutch packs (it has 4 of them) they are actually both turning at the same speed so both packs can be applied at the same time, no slipping, no shock load and no change of speed when it changes clutch packs. |
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Wi | TORQUE - 8/31/2013 16:50 If you study the Case CVT it is a very interesting design, it does have forward-reverse clutch packs on the input side of the CVT (so low torque). When it changes range clutch packs (it has 4 of them) they are actually both turning at the same speed so both packs can be applied at the same time, no slipping, no shock load and no change of speed when it changes clutch packs.
Yes they're range shifts operate a lot like a Direct Shift transmission. |
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Video to explain the Agco/Fendt CVT transmission
