Why no 4 wheel drive on roads?

   / Why no 4 wheel drive on roads? #31  
I was advocating diesel-electric way back when Priuses were coming on the scene. But as far as for a tractor... Whereas a transportation vehicle can be viewed as operating two-dimensionally a tractor would be operating three-dimensionally.

How to load balance across travel and loader work (PTO operations tend to fairly constant) would be tricky. Maintaining sense of and actual fluidity might be tough.

Electrical stuff can be a lot more sensitive to harsh environments than flat-out metal.
Much easier to regulate an electric motor.
 
   / Why no 4 wheel drive on roads? #32  
I look at huge tires like that and get anxieties over a puncture!
 
   / Why no 4 wheel drive on roads? #33  
Much easier to regulate an electric motor.
I agree, but I was mostly commenting on what Lou had said:

A decent sized battery pak, a small diesel tuned for economy at a couple of different rpm's driving a generator

Hybrids, other than diesel-electric trains, use batteries. That means storage, buffer storage. How to design/spec for a lot of loader work? Would seem that more batteries would have to be used, which then starts pushing up against the size available for the diesel engine. Regulation is one thing, having enough power to meet the various tasks, and do so fluidly, is another...
 
   / Why no 4 wheel drive on roads? #34  
I agree, but I was mostly commenting on what Lou had said:

A decent sized battery pak, a small diesel tuned for economy at a couple of different rpm's driving a generator

Hybrids, other than diesel-electric trains, use batteries. That means storage, buffer storage. How to design/spec for a lot of loader work? Would seem that more batteries would have to be used, which then starts pushing up against the size available for the diesel engine. Regulation is one thing, having enough power to meet the various tasks, and do so fluidly, is another...
If your genset is way to small vs the electric drivetrain you will have problems, on a tractor a hybrid will not generate to much power, except maybe with extensive loader use or road use, here in Europe where tractors is constant used on public roads you have a potential for energy preservation, if this potential is big enough to make it economical viable is a another question.
 
   / Why no 4 wheel drive on roads? #35  
If your genset is way to small vs the electric drivetrain you will have problems, on a tractor a hybrid will not generate to much power, except maybe with extensive loader use or road use, here in Europe where tractors is constant used on public roads you have a potential for energy preservation, if this potential is big enough to make it economical viable is a another question.
Most tractors on this site aren't roaded. I've roaded mine, but sparingly. And some folks around me do also. But all in all it doesn't constitute enough of the overall demand/function that added complications from hyrbidization is going to offset.

If you look at large corporate operations the move is always toward larger (for volume) an more specific machinery. Refer to the picture Lou posted.
 
   / Why no 4 wheel drive on roads? #36  
Most tractors on this site aren't roaded. I've roaded mine, but sparingly. And some folks around me do also. But all in all it doesn't constitute enough of the overall demand/function that added complications from hyrbidization is going to offset.

If you look at large corporate operations the move is always toward larger (for volume) an more specific machinery. Refer to the picture Lou posted.
The road use if tractors are a very clear difference between US and Europe. Here a tractor with a trailer behind almost the default way to transport things if the distance is not to long.

Don't know how many rigs like the picture I meet on a day but it's quite a few.
i287104489226719883._rsw480h360_szw480h360_.jpg
 
   / Why no 4 wheel drive on roads? #37  
Yup. Definitely NOT a CUT! :) We have various big rigs running equipment to/from various sites, but material is mostly hauled with a truck: manure trailers are run behind tractors, though. People around here tend to keep their big tractors in the soil and working.
 
   / Why no 4 wheel drive on roads? #38  
apologize for the obvious, to relieve my '92 4x4 toyota pu switching back to 2wd, i come to a full stop, reverse & it will usually do the trick
on the tractor, either by reversing, or by slightly lifting the ft end w/FEL will disengage a stuck 4wd. thinking my limited slip ft end also helps w/the 4wd binding. love the higher end M series...
 
   / Why no 4 wheel drive on roads? #40  
awesome set up, would like to see. mudders have large ft wheels as well, maybe something similar in application
killer blade
 

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