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Tractor Talk Discussion Forum

Hydro vs IVT

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PhilcaseinWPa

10-31-2006 05:40:57




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And speaking of hydros....

Is the IVT transmission on some of the new Deeres and I think Masseys the same idea or something completely different? Just wondering - til I hit the lottery - (won't happen I'm too cheap to buy a ticket)
Phil




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S. Mahoney

10-31-2006 11:20:19




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 Re: Hydro vs IVT in reply to PhilcaseinWPa, 10-31-2006 05:40:57  
The CVT in Fendt's, AGCO's, Challenger's, and Masseys is basically a planetary gear set. The engine's crankshaft turns the inside of the planetary. The ring gear is driven by the transmission's own variable displacement hydraulic pump and motor. When the ring gear turns the same speed as the crankshaft the tractor is stopped. The slower the ring gear turns the faster the tractor moves so as speed increases the power transfer becomes less hydraulic and more direct/mechanical. To go in reverse the ring gear turns faster than the crankshaft to run the output shaft backwards. The output shaft from the planetary then runs a high/low gearbox for field/road speed ranges. It is important to run in field mode under heavy loads or the hydraulic part of the transmission will burn up. They operate the same in all brands except Massey which has the transmission programmed to drive like a 21 speed powershift.

Deere's IVT works similar to this as they bought rights to some of Fendt's patents when they developed this transmission.

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RodInNS

10-31-2006 06:44:55




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 Re: Hydro vs IVT in reply to PhilcaseinWPa, 10-31-2006 05:40:57  
There's probably people out there who can detail this a lot better than me.... However, as I understand the Massey (which was developed by Fendt), this transmission uses a hydrostat to drive a fully powershift transmission. The whole thing is fully drive by wire. You want to go faster, push the joystick further ahead.... Quite a slick idea; gives infinitely variable speed from 0 to 50 kph. It's also supposed to be more efficient than a gear drive due to the fact that you can always find the most efficient speed to operate at. That's the theory anyway. I'd imagine that the Deere IVT works on a similar principle. Personally, I think I'll stick to my dino gear drives..... .

Rod

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buickanddeere

10-31-2006 07:20:38




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 Re: Hydro vs IVT in reply to RodInNS, 10-31-2006 06:44:55  
Deere IVT has gears and a variable mechanical drive. Hydraulics just control, lubricate and cool.



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