aczlan
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Looks great.
Aaron Z
Aaron Z
Custom UTV
- Thread starter kdlklm
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PapaPerk
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Thanks for the pic. I see you have a pivot at the rear. What support the wheels from moving outward? Is there another link I'm missing somewhere?
PapaPerk
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I've attached a sketch I found on Google of what I would use. This a swing arm concept from a motorcycle. The key is how it attaches to securely support the wheels. You would not use the drive shaft system.
With this design you could run a frame member from one side of the vehicle to other to secure the swing arms. This would make a very rugged suspension. Attaching the suspension just to the side will not be strong enough.
Of course just my opinions! :thumbsup:
With this design you could run a frame member from one side of the vehicle to other to secure the swing arms. This would make a very rugged suspension. Attaching the suspension just to the side will not be strong enough.
Of course just my opinions! :thumbsup:
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PapaPerk
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This robot from Carnegie Mellon has a similar suspension... worth checking out. Lots of videos on YouTube, etc. Here's link with a short clip, pics and description.
Carnegie Mellon's National Robotics Engineering Center Unveils Futuristic Unmanned Ground Combat Vehicles
Carnegie Mellon's National Robotics Engineering Center Unveils Futuristic Unmanned Ground Combat Vehicles
PapaPerk
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Watch this video too. This is a small version. At the end they take off the swing arm for service. Good detail shot.
Mini Crusher Video
Mini Crusher Video
That is really cool, if I only had their budget. It appears that the Mini Crusher doesn't use any kind of swing arm. It just puts a suspension really tight to the tire. The air suspension that I'm going to use will require close to 5 inches of space. So it doesn't really give me much choice but to put the shock either in front or behind the wheel. The machine is getting wider than what I like already. If I move the wheels out another 4 inches, it will be too wide.
I'm just trying to get my head around that swing arm system. How I could attached to what I've got. I'm not quite sure what you mean when you say that I could go from one side to the other. Where would you suggest I put it.
I'm just trying to get my head around that swing arm system. How I could attached to what I've got. I'm not quite sure what you mean when you say that I could go from one side to the other. Where would you suggest I put it.
westcliffe01
Veteran Member
I think you need a pair of panhard rods that run perpendicular to the axis of the vehicle to stabilize the long swing arms. The Panhard rod for left hand side swing arm attaches on RHS of chassis and the one for the RHS radius arm attaches on the LHS of the chassis. If you do it right, the rods would be horizontal at nominal weight so that any lateral deflection is spread out evenly.
A vehicle with a rigid rear axle only needs one, but you have independent suspension so to keep it working best you need 2. It also means that there has to be some compliance at the pivot position for the radius arm, otherwise that end of it would be subject to huge stresses. Usually using 2 flanged PU bushings works for that.
panhard bar
A vehicle with a rigid rear axle only needs one, but you have independent suspension so to keep it working best you need 2. It also means that there has to be some compliance at the pivot position for the radius arm, otherwise that end of it would be subject to huge stresses. Usually using 2 flanged PU bushings works for that.
panhard bar
BHD
Veteran Member
just a thought may not work and then again it may,
just use the cylinder, and put next to the cylinder an accumulator,
If you let fluid out of the cylinder circuit you lower, if you add you raise and the accumulator is charged such that it will act as a spring,
And all the accumulator need to be is a Hydraulic type cylinder, with a moving piston to separate the nitrogen charge from the fluid, if one wanted to one could add a spring in the accumulator and not depend on the nitrogen charge entirely,
you would need a flow divider or separate circuits on each wheel or you my have balance issues,
but with the system one could level the unit for the wheel chair rider, if the ground is sloped as well, and if separate circuits it could be leveled side to side some what like a hill side combine is,
~~~~~~~~~~~~~
the other Idea is just a put a leaf type spring on the arm for the spring and use the cylinder to raise and lower,
~~~~~~~~~~~~~
My sister had a handicap van that would kneel for the wheel chair ram, and all it was a cable on the axle and a electric driven kneel actuator unit that would pull on the cable/chain and compress the spring on that rear of the van, and just compress the spring, and then one would release it and it would raise up and the cable just floated as the suspension worked, (It malfunctioned when she was visiting me one time and to get her home I had to disconnect the cable),
just use the cylinder, and put next to the cylinder an accumulator,
If you let fluid out of the cylinder circuit you lower, if you add you raise and the accumulator is charged such that it will act as a spring,
And all the accumulator need to be is a Hydraulic type cylinder, with a moving piston to separate the nitrogen charge from the fluid, if one wanted to one could add a spring in the accumulator and not depend on the nitrogen charge entirely,
you would need a flow divider or separate circuits on each wheel or you my have balance issues,
but with the system one could level the unit for the wheel chair rider, if the ground is sloped as well, and if separate circuits it could be leveled side to side some what like a hill side combine is,
~~~~~~~~~~~~~
the other Idea is just a put a leaf type spring on the arm for the spring and use the cylinder to raise and lower,
~~~~~~~~~~~~~
My sister had a handicap van that would kneel for the wheel chair ram, and all it was a cable on the axle and a electric driven kneel actuator unit that would pull on the cable/chain and compress the spring on that rear of the van, and just compress the spring, and then one would release it and it would raise up and the cable just floated as the suspension worked, (It malfunctioned when she was visiting me one time and to get her home I had to disconnect the cable),
I think you need a pair of panhard rods that run perpendicular to the axis of the vehicle to stabilize the long swing arms. The Panhard rod for left hand side swing arm attaches on RHS of chassis and the one for the RHS radius arm attaches on the LHS of the chassis. If you do it right, the rods would be horizontal at nominal weight so that any lateral deflection is spread out evenly.
A vehicle with a rigid rear axle only needs one, but you have independent suspension so to keep it working best you need 2. It also means that there has to be some compliance at the pivot position for the radius arm, otherwise that end of it would be subject to huge stresses. Usually using 2 flanged PU bushings works for that.
panhard bar
would that not affect my ground clearance, I want to keep the middle as open as possible. One thing I have looked at is a single-sided swing arm that are used on motorcycles. I could build something like that.
