File:AT e-velomobile contruction 2.JPG
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Sketch of detailed e-velomobile propulsion system. Note the chain connection between 5 & 6/9. Using a derailleur, the chain can be put around 5 & 6 or 5 & 9 (chain between 5 & 9 is used for mode #2). There are thus 2 derailleurs in the system, controlled directly by the vehicle's mode control system. Note that a derailleur was chosen for this, despite that a manual gear system (similar to cars) could have been used because a derailleur reduces weight (no gear selector/gearbox required, ...) and keeps the vehicle easier to repair (as only 1 energy transfer system is used introduced twice)
It should be noted that nrs 3, 4, 6 don't seem to add much to the design, and in essence, they don't, but were nevertheless placed there to transfer the energy to the back, below the passenger. It would have been possible to leave these out in the general sence and couple 2 immediatelly to 7 (the gears), but this solution would probably require the chain to go trough the cabin (in which the driver sits). I don't like this as it may dirty the driver's pants, ... and make it more difficult to get inside the cabin. A chainless energy transfer (ie shaft drive, ... ) could then be used (see http://en.wikipedia.org/wiki/Chainless_bicycle ), but I'm not sure whether there is any space at all in the cabin.
In addition, I also considered about the implecations in regards to efficiency loss; the tensioning problem of the many chains can only be partly fixed ie using the chainless variant. For the reduced efficiency, I was thinking that we could integrate a lever system. I saw one being used locally (see text+ image I made at http://www.appropedia.org/Cycling#Bicycles_with_lever_arms ). This system though isn't perfected and also runs quite bad; ie at a specific point of the rotation of the pedals the lever kicks in causing this part of the rotation to be harder to push, after which the speed immediatelly increases again. I was wondering whether we could integrate this system (to "solve" some of the efficiency losses) but perhaps seperate lever and pedals (by placing a modified lever system on the axle of the wheels, ... Alternatively, we can place it only at the chains propelled by the pedals.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:48, 20 July 2010 | | 2,676×1,216 (339 KB) | KVDP (Talk | Contributions) | |
| 09:46, 20 July 2010 |  | 2,676×1,216 (339 KB) | KVDP (Talk | Contributions) | (Changed schematic; added chain) | |
| 11:36, 16 July 2010 |  | 2,676×1,216 (320 KB) | KVDP (Talk | Contributions) | (Added differential to drawing) | |
| 09:14, 9 July 2010 |  | 2,676×1,216 (272 KB) | KVDP (Talk | Contributions) | (sketch of detailed e-velomobile propulsion system) |
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