tracked vehicle differential questions

   / tracked vehicle differential questions #71  
This is brilliant.

I'm grinning from ear to ear at the moment. One thing after another pops up that I've already been looking at or am currently considering.
That twin HST pump you mention/show ... I'm seriously considering adding a couple of those to my shipment from surpluscenter so I can make a pair of small bulldozers for kids later on in life. Using 7cu wheel motors will give nice, slow, safe walking speeds, and HUGE torque :D

However.. Driving cylinders with them is possibly a bad idea for the reason you mention, and you'll only be able to drive 2 cylinders with one pump... unless you invest in valves... and even then I'm not sure the "semi-closed circuit" HST pumps would be happy. The Gurus on here will know. I'm a hydraulic newbie too and my opinion should be treated with caution :D

I'm only unsure about the hydraulic PTO motor and how to drive /control that.

I'm thinking that a simple bank of six 8gpm spool valves will do the job just fine for me, and a 5 or 8gpm belt-driven pump.
I'm resigned to the fact that this project won't come cheap... :eek:

The HST pumps might share the same chain (as yet undecided - I prefer separate chains really), whereas the PTO pump will have one to itself. A different gearing between the two may be needed at some point :)
My neighbour sells motorbikes in one of the biggest dealerships in Sweden... and obviously has access to vast amounts of different sprockets and chains - I'll get a good price ;)
The smallest of all the pumps will probably end up being V-belt-drive from somewhere - I don't see that one as a problem.

When it comes to coupling and alignment, I have a pair of R+W EK2 elastomer couplings (300 series) on my desk. They're overkill but perfect for the job.
R+W | ELASTOMER COUPLINGS | EK2

The secret to a problem-free alignment is to use TWO coupings to mimic a driveshaft or PTO shaft with a coupling at each end. R+W actually produce a unit specifically for that. R+W | ELASTOMER COUPLINGS | EZ2
And it's this what I'll be mimicing with my couplings. you can even mount your engine on rubber bushings if you fancy, and separate the vibration from the rest of the chassis.

The TUD5 engine was used in the Citroen AX, the Peugeot 106 and the Citroen Saxo. They're REALLY common over on continental Europe and the UK. I'll nip over and get one when the time comes. :thumbsup: A lot of people in the UK fill their old Citroens with a quarter tank of diesel, and three quarters vegetable oil from the supermarket (much cheaper than diesel) and drive them problem free for a really low cost :D

In an interseting twist - one of my colleagues (A Graphic Designer) looked over my shoulder the other day at my computer screen, saw what I was working on and said "can I have a go at that?" ... I've sent him my models and a design breif, and am rather interested to see what he comes up with. :licking:
 
   / tracked vehicle differential questions #72  
Yes, I have been looking at that double pump for a while. I need one, just don't know for what yet? I was going to order one just to play with but shipping even just here in the States was pretty steep. I like the mini bull-dozer idea. If you build those first maybe you won't have to do any of the snow removal yourself? :)

It will be nice to have motorcycle chain and sprockets easily accessible. Just being able to try a different size without having to wait a week and outlay the money on a hunch that might or might not work will be a huge plus for you.

I would love to see your drawings before/after your friend goes through them. It is always great to see another persons ideas. I have a rough picture in my head of what I think you might be envisioning. It would be interesting to see how far off my perception is from your actual plans.
 
   / tracked vehicle differential questions #73  
We are GO!

Today I fired off 4500Kr to the UK to pay for a TUD5 engine.

(a few years ago when our currencies were 10:1 that'd have been about 450USD, but nowadays with the exchange rate at 6.6:1 it's nearer 700USD
... for my own selfish needs, I hope it stays that way until I've ordered all the hydraulics from surplus center! :eek:

This is the first and last thing I'll be spending money on before summer.... but at least it gives me something to play with. :thumbsup:

When I have sketches, I'll start a thread for the machine... The thread will be slow, but it'll give me somewhere to keep a record :)
 
   / tracked vehicle differential questions
  • Thread Starter
#74  
Congratulations! I can't just order one part and have it sit, I would "have" to do it all at once, I'm not that patient of a person.
I am looking forward to your drawings and build.
dave
 
   / tracked vehicle differential questions #75  
Thanks :) The main reason is that everything else will be fabricated or new... and this is the one thing that'll need a bit of TLC before it goes in. So I get to build an engine stand and get it all running and purdy before I get anything else. Just a tangible bit to ogle before I get down to it properly :D
 
   / tracked vehicle differential questions #76  
Nothing much to report... I have my engine, but haven't had time to work on it. :eek:

Oh.. and after banging ideas around, I've now reached a basic look for it... in this picture it's lacking the 3pt lifts at front and rear, and some bare essentials like suspension/undercarriage... but I'm starting to get somewhere.

Don't go expecting an update any time soon: I have 40sqm of decking to make, a livingroom to finish, and a bathroom and Kitchen to do (apparently) so it really might be next year before I do anything more.

Anyway... Here's "Trakki"

multi%2520view.jpg
 
   / tracked vehicle differential questions
  • Thread Starter
#78  
Just checking in to see if Nick or anyone else is moving their project along? I sadly am not at this time but am still considering it.
 
   / tracked vehicle differential questions #79  
I skimmed thru this the thread, I was curious if anyone ever thought of Z-turn motors/pump and controls? I think they would work awesome!
 
   / tracked vehicle differential questions
  • Thread Starter
#80  
I'm not familiar with the z-turn set ups but I don't see why they wouldn't work. My problem is I don't like the noise of hydraulics. We (snowmobile club) have a cushman trackster and it's loud as heck in the cab. You can hear the hydro above the new Honda v-twin.
 

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