Hydrostatic ATV

[kdlklm]

Here are a few update photos of the 3-D design. Subaru was kind enough to send me a full-blown 3-D model of their engine, perfectly to scale with every possible detail. The file is so huge my computer could barely open it. I couldn't find any 3-D files of engines in the 30 hp range, and none of the companies except Subaru were willing to send me a file. I don't think I'm planning on using a Subaru engine, but it is very close to the size that I'm looking for. I think I'm going to use a Kawasaki with a digital fuel injection.

I think I've decided to go without a front-end kneeling system. And just go with the foldout 48 inch ramp. It is about a 1 foot incline, which is a little bit steep but not too bad. I couldn't come up with an idea that I feel would be strong enough to have the front wheels move up and down to lower and raise the front-end. I would love to get some input if someone had a creative idea.

 

[Iplayfarmer]

I couldn't come up with an idea that I feel would be strong enough to have the front wheels move up and down to lower and raise the front-end. I would love to get some input if someone had a creative idea.

Build a swing arm that the wheels are attached to. Now have hydraulics raise and lower the "seat" inside the footprint of the swing arm.

They have skid loader trailers that the whole bed drops down to ground level. If that system can hold a skid loader, you should have no problem holding a mobility scooter or powered wheel chair.

 

[kdlklm]

That's a very interesting idea, i will have to look into that. It might be complex but interesting. would you happen to have any photos of an example, for exactly what you're talking about.

I found the following website which is good a good example of what I'm sure you're talking about.

http://www.lift-a-load.com/index.html

 

[Iplayfarmer]

That's a very interesting idea, i will have to look into that. It might be complex but interesting. would you happen to have any photos of an example, for exactly what you're talking about.

I found the following website which is good a good example of what I'm sure you're talking about.

Lift-a-Load Elevating Platform Trailers and Lo Riser Inclining Platform Trailers by The Advance Metalworking Co., Inc.

Those look like the skid steer trailers I've seen.

Here are some simple drawings of the swing arm concept I'm talking about...

 

[kdlklm]

I tried a little bit of a different approach, I wanted to incorporate the fold up ramp into a fully automated system, to reduce the amount hydraulics. The pieces for the foldout ramp are a little crude yet, but now that I've got the ratios right, I will start to incorporate better pieces. Does the system look strong enough, I used a thrust bearing between the mainframe at the wheel motor mount, there is 1.75 inch shaft holding it together. Let me know what you think.

 

[kdlklm]

It looks like I might have to go with a two pump configuration, for the hydraulic system. What is a typical set up, for running two pumps off one motor.

 

[aczlan]

It looks like I might have to go with a two pump configuration, for the hydraulic system. What is a typical set up, for running two pumps off one motor.

A double pump could work or a chain/belt driving two pumps.

Aaron Z

 

[kdlklm]

Essentially a double pump is just two pumps piggybacked. Is that correct.

 

[kdlklm]

I've also been considering changing my design to a similar machine as the photo attached. But I can't seem to find a track that will be long enough for my needs. I think one for a skid steer would be way overkill. My machine will be about 80 inches long. So the track would have to be very close to that. Because if I do go the track system, I will just have two tracks. It will help make the hydraulic systems less complicated.

All the ATV track systems are designed for the four-wheel system. Any suggestions.

 

[kubotakid USA]

I've also been considering changing my design to a similar machine as the photo attached. But I can't seem to find a track that will be long enough for my needs. I think one for a skid steer would be way overkill. My machine will be about 80 inches long. So the track would have to be very close to that. Because if I do go the track system, I will just have two tracks. It will help make the hydraulic systems less complicated.

All the ATV track systems are designed for the four-wheel system. Any suggestions.

kdlklm,.. I was surfing along and came across this post, I knew right away, we had talked over on hyd/pnu , Ive never shared and ideas with you, But have enjoyed reading this post, If you remember, I have three friends in wheel chairs, so, Iam Very intrested in building a prototype, and seeing these guys try it out! Iam leaning twards a zero turn chassie, It offers excellent mobility, and reasonably cheap to build, But Iam also looking at the 4x4, articulated, model that you posted a pic of, IMO, I would build it using (1) hydrostatic pump,..With 4 wheel motors, If you use a wheel motor with a (case drain) , you can run multipul motors, in series, and your speed will not change, The oil goes threw 1 motor,. then to the next, and so on, Very simple, You might need a flow valve or two, but I know It works and works good, as I have a small road grader set up this way, Than I would piggy back a small hyd pump for steering and hyd lift/attachments, Theres a real sharp guy over on hyd/pnumatics, kevinj, He might be able to help with the Pump/motor specs, :thumbsup: I love these kind of projects, and will help what i can, Eric