Independent suspension

[Dr.Ickwood]

Does anyone know of any suspension system that allows completely independent springing/damping of bump and roll?
ie. a suspension that could for example allow 150mm of vertical wheel travel in roll (movement of only one wheel, or both wheels in opposite directions) but only 50mm of vertical movement in bounce (vertical movement of both wheels simultaneously)

I need this for a tilting three wheeler project im doing. Iv been through all the common suspension systems and many of the un-common ones but cant find anything suitable

Any help would be greatly appreciated, thanks

[GreenV8S]

What you're describing is modal suspension. That should be easy to arrange with a beam axle, with modal springs for bounce and roll? For example a central spring/damper unit for pure bounce, and separate ones on each side for bounce/roll? There are lots of other ways of achieving that behaviour, but I don't think this calls for anything tricky/.

[Sam_68]

It's easy to isolate bump movement of both wheels (ie. dive/squat) from roll movement.

It's next to impossible, in practice, to completely isolate out single wheel bump, though... at least without ridiculously complex linkages, interconnected hydraulic suspension, or active suspension.

You can isolate roll from dive/squat by using a single 'floating' spring/damper linked to rockers on the top of conventional wishbones and, of course, the good old anti-roll bar is nothing more than a torsion spring that is free to rotate in dive/squat, but single wheel bump transmits force to the opposite wheel in either case.

Edited by Sam_68 on Friday 13th April 19:56