The Vario transmission | Functionality | Fendt 724 | Renè Wengelewski | 2021
Вставка
- Опубліковано 28 тра 2024
- The Vario transmission is currently the heart of every Fendt tractor.
In this video, I explain to you the structure and operation of this transmission and the changes in the new generation.
To jump to the different chapters, just click on the time:
00:00 Introduction
00:43 Special features of the gearbox
01:22 Similar principle with other manufacturers
02:01 Structure of the Vario gearbox
04:19 Structure and function of the planetary gear unit
05:25 Function of the Vario gear unit
07:36 Summary / brief description of function
08:59 Differences in the new 900 & 1000 Vario
10:02 Pull-in turn
10:37 Fendt Torque Distribution
11:02 Conclusion
Design and operation of an axial piston pump:
• Axialkolbenpumpe / Axi...
Source of the transmission animations: AGCO/Fendt Marktoberdorf
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"Can you english please!"
Good job, Rene!
Great video! I study a lot about CVT transmission in modern tractors and compare them. Very interesting material!😊
Thanks for the English version 😎 👍🏼👍🏼
enhorabuena por el video desde TractorPasion
Superb video, grats.
didnt understand nothing, but it looks very interesting
something people don't understand: in forward the vario gearbox's hydrostatic group only act as a mean to brake the hollow gear which mean it's efficiency is pretty much irrelevant since all we want from it is to define the gear ratio of the whole gearbox by defining the hollow gear's speed.
you can turn anny 4x4 with a central diff to "vario ish" cvt by removing the rear drive shaft, puting it in any gear the rear output of the transfer case will spin freely until you start puling at the handbrake putting resistance on the rear output of the transfer case forcing the power to the front wheels that's how the vario works without burning your park brake using hydraulics instead.
Effeciency is still very much important , no matter if you use the pump for powering up or braking down. Doesn' t matter. If it takes to much power to act as a brake, the transmissions effeciency will be ruined also.
@@bartdereu that's where it gets tricky, how much the engine consume more as the hydraulics are worse and dissipate more through heat, someone at fendt's R&D surely know i don't. what i know is that the gearbox is cooled at 50°C instead of 90 on most tractors and easily even without a dedicated cooling circuit on recent models, to use it daily i can tell it was day and night compared to a semi power-shift even cold. And there is the DLG institute of our pragmatic German neighbours that did an extensive study of the European middle-sized range of tractors from all the big name brand 100 to 300+hp maybe even 400.
Then fendt tractors were either first or on exact equality first with cnh on one model and only the 514 or 516 was beaten by another cvt.
The self proclaimed revolution that rivals with fully mechanical transmission that is the direct drive from deere was part of the studies, it would have been dead last if not for the same big promises brand's autopower that happen to be even worse.
no power shifts or semi P.S. beats the leading CVTs meaning those transmissions are up there between the good old mechanical and the best powershifts. Yes there are losses like any gearbox, but we are nowhere near an hydrostatic transmission in term of losses, despite what the presence of those component might get people to think.
Key difference would be VARIO type hydro-mechanical transmissions are regenerative.
Well done :)
Super video again, great explained! On english is great ;-) Thank you!
Cheers mate!
@@wengelewski At 8 km/h in first range, I have pure mechanical drive? I didnt know that. You have two accounts here.
@@tomyhr501 Yeah, I created this channel for english videos, the other one is only for german.
No, you don't have pure mechanical drive at 8km/h in first range, but the best efficiency. In a nutshell: Axial piston pumps have their highest efficiency fully swung out. They reach this swivel angle in drive range one at about 8km/h, in range two at about 12-14km/h. If you accelerate further, a larger mechanical part is added, but the efficiency of the hydraulic part decreases significantly more than that of the mechanical part increases. The hydropumps and -motors are therefore designed precisely for this speed range.. if this makes sense. You only drive purely mechanically at maximum speed.
Englisch auch richtig gut! musste jetzt doch mal nachschauen aufgrund Deines subtilen Hinweises drüben ;-)
Is there a real, actual video showing how the hydraulic pump and motors swinging out and in?
Dachte erst hier will wer einen fake acc von dir machen. War aber dann voll erschrocken😂 woher kannst du so gut Englisch?
👍🏻🤣 Keine Ahnung..üben🤷🏼♂️😅
@@wengelewski Ich gebe meins bestes😂