Has a vehicle ever come with dual driveshafts?

https://www.motortrend.com/features/v-drive-4x4-van/

 

beamed 4wd? holy hell!!! that is so rad

 

On the Chinook, the two counter-rotating shafts balance each other because of the props. The props create opposing torque due to drag in the air.

 

Not at all Just a basic front wheel drive vehicle set up to drive the rear axles on a 45 degree angle instead of ninety degree angle .

Being in the seventies very interesting.

 

This would be a night mare to keep things adjusted .

I do not see any real world benefits at all.

The differentials would need to be a completely new design .

To allow them to be able to track completely independent .

Possible in low horsepower and low torque applications I can`t picture this at normal road speeds with 500 HP plus.

 

And the dual output shafts from the transmission in my drawing and also the Lego video cancel each other out by having opposing torque on the input to the differential.

 

They don't cancel each other out. You're splitting the power only to combine it again. The chassis lifts because of the resistance of getting the truck to move. The power applied takes the path of least resistance. First it takes the slack out of the drivetrain, next is loading the suspension (the twist you see) and finally the last place left is to start moving the truck forward.

Edit, had a shower thought!

This is just how I see it but could very possibly be wrong.

Your example of the counter rotating driveshaft only cancels out the effect of the weight of the spinning shaft itself, not the tq it transmits. Which in the scheme of things is next to nothing. You could get the same results by putting another shaft down there and spinning it the opposite direct with an electric motor. It wouldn't stop the car from shifting to the one side.

Or using your Chinook example. Your proposal would be the same as removing the front rotor but leaving the driveshaft to it in place. Do you think the opposite rotation of the front shaft would counteract the rear going the opposite direction?

 

Dual driveshafts will increase driveline power losses (more gear resistance, more mass to rotate, stealing energy) and not solve the issue.

The reason the truck frame twists is the engine is spinning in one direction… and when you engage the driveline to take off from a stop, the torque from the engine is applied to the rear end thru the driveline. Because of the mass of the truck, that torque is partially transferred to the rear wheels hitch begin rolling, and partially applied as a bending moment which pushed against the frame of the truck. Since the truck can’t just go 0-60 right away, some of that excess torque from the engine is used up pushing in the rotation the engine is turning.

An easier example is using a drill to mix concrete or something thick. The drill can often try to rotate in your hands while stirring the mixture, because it is easier for that energy/torque to be spent rotating your hands vs the material/load you are mixing. The drill mixing attachment simply translates that torque from the drill.

 

Yes Ford 4x4 vans from the 1970s-1980s

Called the Vemco-Dana V

 

That has to be the most bizarre IFS I've seen.

 

And what about hand mixers? Mix some brownie mix and there is no twist on your wrist.