chewy Posted October 19, 2012 Report Share Posted October 19, 2012 Is there anybody out there who is expert in ; torsion bar physics...machined springs.... or bearings.. I have (in my imagination) a cunning plan to make a swinging arm with constant chain tension, "different" suspension with adjustable footrest position thrown in for good measure. One of the problems involves using as low a friction sliding joint as is possible, ,I have in minds eye something like a strip of needle roller bearing (c 10 wide X 150 long X (eg). 2mm thick which can be "bent" & fitted into the "joint" a bit like big end shells in a car conrod./ What I.m trying to achieve is less weight , less unsprung weight, C.O G. lowered, more space for airbox/exhaust, constant chain tension, rising rate springing with seperate damping. A little project to play with in my retirement is all it is , if I/we can stimulate some new ideas for development of better trials bikes along the way, so much the better. Quote Link to comment Share on other sites More sharing options...
tazz229 Posted October 20, 2012 Report Share Posted October 20, 2012 I would imagine if it was beneficial or feasible for any type of gain, then the multi million pound teams like repsol etc would have already explored it.... Quote Link to comment Share on other sites More sharing options...
copemech Posted October 20, 2012 Report Share Posted October 20, 2012 Don't think a short lateral torsion rod would work if that is what you are asking. The bearings may be possible! I did hear they found a metal with enough memory in that alien crash at Area 51 in NM a few decades back, not sure about the rates? Quote Link to comment Share on other sites More sharing options...
axulsuv Posted November 10, 2012 Report Share Posted November 10, 2012 Or just have the countershaft and swingarm pivot be one and the same , hence constant center distance between sprockets ... aka BMW ... Quote Link to comment Share on other sites More sharing options...
richt Posted November 10, 2012 Report Share Posted November 10, 2012 Early eighties somebody did something like this, The swing arm pivot was concentric with the front sprocket, it was two pivot bolts one each side, also a high and low ratio gear box so it had the equivelant of eight gears. (2x4) I'm going to see if I can look it up. Quote Link to comment Share on other sites More sharing options...
axulsuv Posted November 10, 2012 Report Share Posted November 10, 2012 2009 BMW G450x ... Countershaft and swingarm pivot have the same center , but not the same shaft . Best tracking dirtbike I've ever riden ... Quote Link to comment Share on other sites More sharing options...
0007 Posted November 14, 2012 Report Share Posted November 14, 2012 One of the biggest issues a manufacturer faces is patent infringement, really hinders development The trick new thing you want to see might be used on some lawn tractor or something and the manufacturer either needs to pay the patent holder or do something different The game that companies like Honda plays is that they let some brands infringe on their patents, then a couple of years down the road they can threaten and control things through potentialy very expensive legal action Honda makes Billions every year licensing things they will never use to other manufacturers Sucks huh, so next time you look at your bike and say "why did they do that?".....it's probably because they had to, not cuz they wanted to Quote Link to comment Share on other sites More sharing options...
nzralphy Posted November 15, 2012 Report Share Posted November 15, 2012 Hi Chewy how is it going mate. If it is for you you can copy anyones patent.... you just can't sell it to anyone or make a 'gain' from it. I have a book on springs around here. Somewhere unpacked. I'll try dig it out. Your standard spring on the bike is acting exactly like a torsion spring... but someone just wound it up to a convenient shape. so.... Flipp'n heck you're talking of a short spring mate. I'd imagine making a strong connection at either end of such a powerful spring will be the challenge. Quote Link to comment Share on other sites More sharing options...
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