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The roller would be pushed back until it is in contact with the rear tire. As the rear tire rolls forward it pulls the roller under the tire which lifts the tire off the ground. The roller is prevented from going farther back by links on each end of the roller which are attached to the cycle. As the
wheel continues to turn the roller, which is spinning in the opposite direction, pulls the motorcycle backwards. To go forward again the rear brake is applied while going backward causing the roller to go to the front of the tire.
This kind of mechanism would be most suitable for use with a sidecar.
or, you could just buy a motorcycle with a reverse gear built in.
http://powersports....05&ModelId=GL1800A5
click on "specifications" and enjoy. [ato_de, Nov 16 2004]
It could go here.....
http://www.classicbands.com/rollers.html
...with apologies to [Half-heard genius] [normzone, Nov 16 2004, last modified Nov 17 2004]
[link]
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where would this roller be when not in use? |
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The roller and linkage would be carried under the cycle. Most likely the center stand would need to be removed. |
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I understand that already very heavy touring motorcycles are equipped with a reverse GEAR. Honda, BWM, and other have this. |
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[Letsbuildafort] True, sometimes a reverse option is available on some machines and this is by far the best solution if you need to back up. This idea is for machines that don't have a reverse gear. |
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I like this idea because I like simple solutions, but I feel I should point out that if a bike is so heavy that rolling it backwards is hard, rolling it up onto a pair of rollers would be even harder. |
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[Wagster] The bike's power would pull the roller under the wheel and lift the wheel off the ground. It would work best if the bike could go forward a little bit to get on the roller but if the roller were firmly nestled up to the rear tire it would pull the roller under even if the bike could not go forward at all and the tire had to break traction with the pavement to turn. Also, only one roller is needed for this idea to work, and I think it would work better with one roller. |
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sorry, I have to bone this. The ubrupt change in direction when the rear wheel climbed the roller would be extremely difficult to control. My current bike weighs in at just under 700 lbs. I do not have a reverse gear and have never realy needed one. The Honda Goldwing is about 850 lbs, and somewhere between 700 and 850 you cross the manueverability threshhold. That much weight is very dificult to control at low speeds, and tossing the rider back and forth would just result in expensive paint and body work. |
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Perhaps a separate motor assymbly to move the roller into position would work, but at that point, you might as well use that motor to just make the rear wheel turn in reverse. Also, I would always be afraid the damn roller would fall down while I was riding down the street and toss me over the handlebars. |
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[hangingchad] - that's neat, the motion that pulls the bike forward onto the roller is the same motion that propels it backwards. As [ato_de] says, it won't really work, but have a bun 'coz it's a cool idea. |
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[ato_de] Having the roller fall down at speed could be bad, thats for sure. You'd want a design so this would not happen. As far as abrupt direction change: If you could roll forward onto the roller I don't think it would be any big deal. Set the roller, -- put it in first gear, -- ease it up onto the roller -- reverse.
If you could not roll forward at all and had to suck the roller under the wheel by breaking traction (spinning the wheel) this could be hairy -- especially with a solo bike. The idea of laying rubber in reverse on a big heavy solo machine has little appeal. However, this doesn't really have to happen. The machine could be "bumped" back a foot or so by using a brief release of the clutch while the engine was making power. Then the more controllable reverse could be started using minimum power. . |
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[tahuyahick] Thanks for the kind words. |
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I came up with a solution to this problem a few years ago when I modified a 250cc Honda scooter to a 3 wheeler for a bloke who was in a wheelchair. He still wanted to ride a bike, but obviously thats hard in a wheelchair. |
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Basically I cut the frame on the downtubes, just behind the headset, used the rear meachanical half of the scooter (ie minus tank, fairing, seat etc) for one side of the bike, and made a third wheel set from the swingarm of an old ZZR250. The bloke could wheel up the back of the bike (small wheel ramps), lock his wheelchair in place, and go for a ride. |
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Got it all DOT approved and now he can legally ride around. |
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Yes, its only driven from one wheel at the back.
Yes the drive wheel is off centre.
NO, it doesnt cause any issues with regards to torque steer, engine braking yaw effects etc etc.
(its only a 250cc 4stroke scooter with a cvt remember). |
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ANYWAY, obviously being strapped into his wheelchair, strapped into this 3 wheel beast made it a bit hard if he needed to go backwards, right ?! |
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WELL, we set up an aluminium roller on a lever. We connected an ELECTRIC WINDOW WINDER motor and cable set to this roller, so when he pulled the lever, the roller came into contact with one of the rear wheels, a switch was activated, and the window winder rolled the trike backwards. |
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It was strong enough to pull him up inclines, and he wasnt in a rush to go backwards anyway... |
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And it didnt effect the stability of the trike by lifting any wheels off the ground or anything... |
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It MIGHT BE baked based on your anecdotal EVIDENCE except that there could be DISSENTION due to the fact that you modified a TRICYCLE instead of a BICYCLE design. Also, it isn't COMPLETELY CLEAR to me EXACTLY how SIMILAR your invention is to THIS idea as it is HARD for me to DISCERN what your WINDOW WINDER mechanism did and HOW WELL it MATCHES this IDEA. |
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Hmmm... OK bristolz. I`ll bite. |
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1. No-one mentioned a bicycle, or tricycle, except you.
2. A motorised trike is still a motorcycle.
3. The author of this thread actually mentioned it could be used for a motorcycle with a sidecar.
4. My idea also uses a roller.
5. Said roller also comes into contact with rear wheel.
6. Also causes vehicle to reverse its standard operating direction.
7. My description of a solution to the problem could also be considered a "Motorcycle Reverse Roller" |
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As opposed to just being negative and trying to cut someone down, I attempted to put forth an alternate (and tested) solution. If you dont like it, too frikken bad matey ! |
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[Joey], wonderful use of recycled technology. |
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Oh, I liked it fine. "3 wheeled beast" seemed to me as tricycle. |
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Mostly I was poking fun at your meandering CAPITALIZATION. |
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What's the feminine gender term for "matey," "lassy?" |
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