Project Mini Hägglund

[Steinbruchsoldat]

No need for hostility, I knew you were in Germany but unsure of the german used track market, they can be had here for a little over $100...

Sorry, my english is just not good enought, ist wasn't my intend to be hostile...
There are not many snowmobiles in germany, so it's expensive to get parts for them. If I'd get them for a hundred bucks a piece, I'd buy four and build a set of Mattracks for my L300...

a snowmobile's tracks have paddles and are at least 15" wide, with an average length of 120"-174" (normal consumer sleds) plus skis, I'm not being critical only trying to help, I think in 5-8ft snow like you may encounter the tires will not give you traction and bury the "machine" up to the undercarriage, it may be cool on dirt or packed snow but I think you'd be spinning your tracks a lot in the snow

Each track has a contact surface of about 10,5"x50". So with four of them the ground pressure shouldn't be that bad...For traction i can easily add some paddles to the tracks if needed. The trail to our house is always groomed by a Pistenbully, and some ATV's with Mattracks, so it's more like packed snow. I agree with you that it won't work on deep powder snow or drifts. But that's not what it is used for...
I also want to be able to drive on the street or offroad, so i think the tire tracks are a good solution for everything...

Skid steer is when one track moves faster or slower than the other, not like the neat "kinking/twisting" cab of the big Hagglunds. How about trying a hand throttle and apply braking force to one track or the other with open differentials, I know the true Hagglund drive mechanism is neat but it's complex where complexity is not needed.
Again not being critical just trying to help brainstorm, I built my first sled when I was 15 and blew up my last one when I was 22 so I may not be the most qualified person just another helping hand

I could easily do skid steer because i'll use the whole hub assembly from the donor car including the brakes. But i think it just won't work. I think i need to control the joint between both cars, especially when backing up or driving in slope. I think there's a reason why the Hägglunds control it this way...
I also don't think it's more complex, because it uses the whole system out of the donor car. It's a complete system were all components are designed to work together. I just need a few joints between the steering wheel and the steering rack and maybe some pressure lines...

Do you have pictures of your sleds? Would be interesting to see...

And thanks for your help, i really appreciate it. I'm sorry if ist was written rude, but again, my english is just not good enought. I also think we were talking about different things...

Julian

[Ala5ka]

Do you have pictures of your sleds? Would be interesting to see...

Sled is just another word for snowmobile, sorry. I had many, a long time ago so no pics with me now, the last one was a race ready Yamaha Mountain Max 700 triple, bored out, reservoir shocks, ceramic exhaust, Team clutch, float skis, upgraded track, and billet do dads all over. Didn't jet it properly and got too high/too hot and blew the third cylinder. it was just never the same

I was confused because you say "skid steer" which is counter rotating tires or track like a Bobcat, Bulldozer, or Backhoe. A Hagglund is completely unique in its steering being that the "trailer" is part of the vehicle. Best of luck and I'm excited to see how this build turns out.

[Steinbruchsoldat]

Ok, my mistake. What`s the right word for the steering setup of a Hägglund?

Do you know what ground pressure works well for what type of snow? Anyone has some numbers?

[postalWagon]

I believe the word you want is "articulated steering".
I like your project, best of luck.

Cheers,

[Steinbruchsoldat]

Started with the first track and sprocket design today. First mock up of the sprocket:



Jig for the holes in the track:





Tightening the bolts:



First part finished:



Rear wheel:



Sprocket, with updated design:



Joint between both parts of the track:

[78Bronco]

The hinge is very light duty. I am afraid that is going to be a problem.

I am also afraid that the drive sprocket will cause binding. Check out the track and assembly here

http://www.righttracksystemsinc.com/...k-systems.html

You could still utilize the bolts on your tracks to hold the drive links and then do a proper sprocket.

Just my 2 cents worth.

[Steinbruchsoldat]

This sprocket won't be used because of the reasons you're mentioning. It was just a try. I already had a new idea, that needs some testing...

I think the hinge will be fine, but it'll be reinforced with some conveyor belt. The hinges are only a bit smaller than the ones used on the old Kristi and LMC snow cats...

[Steinbruchsoldat]

Here the updated sprocket design. I think something like this could actually work...



Please note that this is just a try, not the finished design...

I also picked up the missing four tires for free:

[Dgurley2000]

Fun project! Too bad we don't get snow here

[Pedro]

Fun project! Too bad we don't get snow here

Trade? send warmth, I'll send snow.