Could this work on a truck? Off road use only!!!! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-29-2001, 11:55 AM Thread Starter
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Could this work on a truck? Off road use only!!!!

Just started to think about something today when I was at my friends farm. He has a 7600 John Deere and I was wathing when he was driving and was amazed at the turning radius on that thing!!! The thing I noticed then went and looked closely at was how when turning the front wheels not only turned but actuall went on a major angle. I'm trying to say that instead of being 90degree's from the ground they were on an angle of more like 75-80. So I went and looked at it and turns out the knuckles on the axle are not pointing straight up and down but pointing foward there for making the top of the wheel move out when turning and cutting the turning radius down alot.

I know this would probably cause extreme tire wear on the road but would it work on a trail rig if there was enough clearance and was only driven on the dirt and rocks?

Ryan

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post #2 of (permalink) Old 06-29-2001, 12:53 PM
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Re: Could this work on a truck? Off road use only!!!!

Most vehicles are already set up like this, just not to the extreme that a tractor is. You probably also notice it more on the Deere since the tires actually turn more than a typical truck, if the trucks tires would actually turn that far they would look the same. If you pull the front tires off of a truck you will seed that the upper and lower ball joints are not straight up and down...typically the upper balljoint is back a little farther from the lower. This is necessary to keep proper handling on the road.

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post #3 of (permalink) Old 06-29-2001, 01:01 PM Thread Starter
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Re: Could this work on a truck? Off road use only!!!!

Yeah, I realize that the trucks have it but not as bad....what I was saying is could you make a truck's extreme for off-road use???

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post #4 of (permalink) Old 06-29-2001, 01:12 PM
 
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Re: Could this work on a truck? Off road use only!!!!

something else that is cool on a tractor is the independent brakes on the rear....hit the brake on the tire you want to turn and you can turn on a dime....that would be pretty cool, have to have an open rear end tho...

Craig

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post #5 of (permalink) Old 06-29-2001, 01:24 PM Thread Starter
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Re: Could this work on a truck? Off road use only!!!!

They also have a Diff Loc in the rear. I think its a manual one almost something like an ARB that you can engage and disengage when you want.



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post #6 of (permalink) Old 06-29-2001, 02:07 PM
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Re: Could this work on a truck? Off road use only!!!!

That's called the Ackerman (sp?) angle. It may be more pronounced on a tractor than a truck due to the limited speed. The other item is 2WD tractors are usually set up with a tighter turning radius and more of an angle. Trying to do so on a 2WD truck would make it unstable if someone were to turn too sharp at too high a speed, so for liability sake, auto manufacturers limit the travel. On a 4WD pickup you usually have less angle and less turning radius due to the limitations of the front u-joints in the knuckles. They may be able to turn a little more than stock, but they would also become very weak. So to answer your question, you can physically alter the characteristics of turning radius (fairly easy to do), but altering the Ackerman angle would require machining that would not be worth the gains. IMHO.

If you didn't built it yourself, how can you call it yours.......
post #7 of (permalink) Old 06-29-2001, 03:28 PM
 
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Re: Could this work on a truck? Off road use only!!!!

<font face="Comic Sans MS">Instead of playing with the ackerman angle of the front end, I'd just put rear steering on the rig... That would make for a better turning radius than even having the front set up like that tractor... [img]/wwwthreads_images/icons/crazy.gif[/img] Harder to control though, but it makes for a good show for anybody watching since rear steering is rare and plus it takes quite a bit of concentration and skill to use it right though... [img]/wwwthreads_images/icons/crazy.gif[/img]

Someday I'd like to have rear steering...</font>

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post #8 of (permalink) Old 06-29-2001, 05:08 PM
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Re: Could this work on a truck? Off road use only!!!!

Tim I once ran a Sky Track ( a large off road type fork lift. ) It has 3 settings for steering. #1. Front wheels steer. #2. Front wheels steer one way the rear steers the opposite. #3. The front wheels and rear wheels both steer in the same direction. The later is good if you need to move sideways without moving very far forward or backward.

post #9 of (permalink) Old 06-29-2001, 05:39 PM
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Re: Could this work on a truck? Off road use only!!!!

If you are going with the rear steering might as well put in a swivel seat so you can see better when you back up.......and maybe add a couple of gears for reverse......just a thought.

kevin

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post #10 of (permalink) Old 06-29-2001, 06:27 PM
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Re: Could this work on a truck? Off road use only!!!!

hey cuttingedge - those things are awesome - ive driven em before!! i love forklifts [img]/wwwthreads_images/icons/smile.gif[/img] esp the caterpillars. but those offroad ones with 4wd and big tires are way fun!! [img]/wwwthreads_images/icons/tongue.gif[/img] ahh...heavy equipment - nothing has changed since we were 4 playing with tonkas in the sandbox....

Mike ~
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