Hydrostatic ATV

[aczlan]

I tried every approach I could think of, using a ramp. To make the ramp slope adequate, the front-end have to lower at least 6 to 8 inches. There is 12 inches ground clearance underneath.

How long is the drivers compartment? What if you had the "floor" hinged at the end and drop ~6" over its length and had a ramp off of that (as seen in the attached drawing)


Aaron Z

 

[kdlklm]

Keith I dont see anything wrong with the orignal design, Ive studied the pics on your first post, and I Like It, I cant see any reason for changing a proven design, Eric

the problem with proven design, is that I don't know exactly how it was built. I've never seen any photos of the machine without one of the tires on.

 

[kdlklm]

How long is the drivers compartment? What if you had the "floor" hinged at the end and drop ~6" over its length and had a ramp off of that (as seen in the attached drawing)
View attachment 208827

Aaron Z

that is a really good idea, the inside of the box where the chair parks is 54 inches deep. The only concern I have with that, is that the hydraulic Rams will have to hold the weight all the time. When the machine is operating. I could reduce my ground clearance a couple inches. But I will definitely have to put some thought into this.

That's why I love posting here, there's some very creative people. Thanks for the illustration.

 

[kubotakid USA]

the problem with proven design, is that I don't know exactly how it was built. I've never seen any photos of the machine without one of the tires on.

OK, Well if thats a problem for you, I wont try and push the pros of it, Ive built that type of axle before. I see flaws in your false floor design, but, if your more comfortable with that design, go ahead with it, Eric

 

[aczlan]

that is a really good idea, the inside of the box where the chair parks is 54 inches deep. The only concern I have with that, is that the hydraulic Rams will have to hold the weight all the time. When the machine is operating. I could reduce my ground clearance a couple inches. But I will definitely have to put some thought into this.

I didn't put this in before, but I would highly recommend a backup way to hold up the ramp. I have added a latching system to the drawing I made before. The idea is that the drop down gate would latch much like the swinging door on a dumpster. That way the pressure is taken off of the hydraulics during normal operation.
I wasn't able to put the latches (L shaped pieces) in place because I was working with Paint not Visio, but they sit so that they hold the round bars (which stick out from the side of the gate) onto the piece that sticks out..

I might attach the linkage to pull up on the gate differently now, but that is the general idea.

Aaron Z

 

[kdlklm]

I didn't put this in before, but I would highly recommend a backup way to hold up the ramp. I have added a latching system to the drawing I made before. The idea is that the drop down gate would latch much like the swinging door on a dumpster. That way the pressure is taken off of the hydraulics during normal operation.
I wasn't able to put the latches (L shaped pieces) in place because I was working with Paint not Visio, but they sit so that they hold the round bars (which stick out from the side of the gate) onto the piece that sticks out..
View attachment 208932
I might attach the linkage to pull up on the gate differently now, but that is the general idea.

Aaron Z

I put together the hinged floor, I haven't done anything for the ramp yet. But it is a 6 degree slope. Not too bad. Here are a few photos

 

[kdlklm]

OK, Well if thats a problem for you, I wont try and push the pros of it, Ive built that type of axle before. I see flaws in your false floor design, but, if your more comfortable with that design, go ahead with it, Eric

I don't disagree that there is a flaw in my design, where the RAM is, is definitely a weak point. I would have to come up with a way to make that stronger. Do you have any photos of that axle system that you built before.

 

[aczlan]

I don't disagree that there is a flaw in my design, where the RAM is, is definitely a weak point. I would have to come up with a way to make that stronger. Do you have any photos of that axle system that you built before.

The weak point I see would be that you have 2 sides with motors mounted and no side support to keep them from flexing inwards or from doing a split.
I think that a swing arm axle like Iplayfarmer posted with a mechanical latch to keep it upright would be a better system. Less possibility for the box to get bent when stressed.

One other thing that you might want to think of, how will you strap your chair in? Given how heavy a powered chair is, I would suggest a system to latch it in separately from yourself. That way if you end up sideways it isnt pushing you down onto the seatbelt and cutting you in half with that.

Aaron Z

 

[kdlklm]

The weak point I see would be that you have 2 sides with motors mounted and no side support to keep them from flexing inwards or from doing a split.
I think that a swing arm axle like Iplayfarmer posted with a mechanical latch to keep it upright would be a better system. Less possibility for the box to get bent when stressed.

One other thing that you might want to think of, how will you strap your chair in? Given how heavy a powered chair is, I would suggest a system to latch it in separately from yourself. That way if you end up sideways it isnt pushing you down onto the seatbelt and cutting you in half with that.

Aaron Z

where would you suggest putting in the hydraulic Rams to lift it, on this particular design.

 

[aczlan]

where would you suggest putting in the hydraulic Rams to lift it, on this particular design.

See my drawing below:


Aaron Z