Main project rendering updated:
You see should a V-motored version here and in the 1st post - if not clear your cache (hold down shift or control and refresh)
To (hopefully) prove that I have a tiny bit of sanity left, and to demonstrate the versatility of the concept, I explored what Scrape would look like as a more traditional e-bike; i.e., one with room for batteries.
This would be a frame made to bolt in place of the original ICE, that holds a battery case and single, direct drive, electric motor - as simple as it gets.
It also brings out another benefit of Scrape's overall design, based on the tubular stressed-engine-member Ninja chassis. I can build a variety of electric drivetrains, all on their own bolt-in subframe, and swap them out when I'm in the mood for something different. It also made me think about selling an e-bike kit based on this concept, alongside the Inhaler Project's kit cars...
No, I don't know how to just relax and have fun - that always ends up looking like some kind of business opportunity or lesson to me - at least that's what my ex-wife said...
This idea uses two complete motorcycle rear differentials facing each other, and mounted to a simple (as possible) fabricated structure. One of the differentials would be turning in reverse but, again, this isn't a race bike - it's for fun. Worse case it wears the gears prematurely and I have to replace them once in a while,
Just thinking about the gears.
Not looked inside one but if they have straight cut gears then there wouldn't be much problem running backwards. If they are helical then one of the pinions would be trying to 'screw' itself off the ring gear while the other is 'screwing' itself in.
If you are designing a casing for them then you could have both ring gears facing the same way on a common shaft with the sprocket on the end outside the case.
Could also peg the ring gear to allow it to handle more torque. Not sure if you are familiar with the term, but you may know the principle.
Here's a UK video about pegging Land Rover diffs.
...If you are designing a casing for them then you could have both ring gears facing the same way on a common shaft with the sprocket on the end outside the case...
I was trying to avoid designing and fabricating a new case to make it an "easy" kind of throw it together project, for fun, but that's not playing out. I also realized, after looking at some diffs on eBay, that the offset would be much wider than I want.
I if do end up designing and building a custom case, I would probably go back to the original idea of having two pinions turn the same ring gear, and see how long it would take to destroy that! The task would still be much simpler than on Scratch because I can simply couple the motor to the end of the pinion shaft, instead of trying to attach the gear to the motor shaft (to get it low enough) and make it line up properly again.
My thoughts on that were to buy two diffs, build a fixture and cut the pinion support from one and fit/weld it into the other. I would have to buy one and pull it apart to see if it would work...
Quote:
Originally Posted by Woodsmith
...Could also peg the ring gear to allow it to handle more torque...
Not sure if that would work in one of these, but it's worth looking into since either way I'm asking it to do more than it was designed for. If I end up doing a custom case that could be designed into it.
In the midst of some other CAD stuff I was working on today, I decided to see how many, and what type of, cells I could fit in my preferred (V-motor) version of Scrape. The results are a little surprising, and encouraging.
These are Turnigy Nano-tech cells. It's a little, 1S/2P, two cell module. 192 modules, for 384 cells total. It's about a 4kwh, almost 200hp, pack, with more voltage and amps than I can use, no matter how I wire them; based on the needs of two 72v/400a Mars motors. That's also enough for 20 miles (80% DOD), or more, of range - much more than I expected. It could be higher because I don't see where this thing would weigh more than 300lbs, and that could mean less than the 150 wh/mi I figure I used.
The one glitch is the controller - I didn't leave room for it. In the Photoshop renderings, I had it behind the glass bubble under the seat, but here that's full of cells. The one place I have in mind, depending on what I would do for the V-motor setup is behind the ring and pinion case. That black section behind it is just the subframe for the drive assembly. I might be able to design it so the controller fits inside there.
Get an unbalanced motor and you'd have a nice "Harley" shake! (Just kidding!)
I had great fun tonight snapping together the Headway cell holders, and I think I can get more cells in less space than I thought in my Porsche, I'm excited about that! Little cells are nice for packaging.
Get an unbalanced motor and you'd have a nice "Harley" shake! (Just kidding!)
I had great fun tonight snapping together the Headway cell holders, and I think I can get more cells in less space than I thought in my Porsche, I'm excited about that! Little cells are nice for packaging.
Thanks David. This one is a keeper. It's a motorized cycle, with great emphasis on the motor part. It's actually a part of a bigger business concept that I have been toying with (more than just vehicles or electric vehicles). I need to start shopping the whole concept around now to find the right partners.
Agreed - little cells make packaging much easier. They're worth the hassle of the extra connections to me. These darn Turnigy cells are incredible! They're up to 65-130c now! Cycle life probably sucks, but I can see the day where I'll be able to put a 100 mile pack in this bike, if technology keeps growing at this pace.
Quote:
Originally Posted by DavidDymaxion
...Get an unbalanced motor and you'd have a nice "Harley" shake! (Just kidding!)...
Lol, I'll stick to balanced motors that stay together for a while! Maybe I can put some french fry grease in a little container that drips on the ground when it's not running!
One thing I would like to experiment with is lower frequencies in the controller. I had this idea with the Inhaler waaayyy back, and I'm still curious what it would sound like. Maybe I'll find a way to experiment with this one. I noticed in the thread with the guy who did the DIY AC drive in a Chevy Express van, he had a low-pitched sound in his videos - I liked it. I think his frequency is around 2K? I know AC sounds different, but in theory is should work with DC too...
This would be a frame made to bolt in place of the original ICE, that holds a battery case and single, direct drive, electric motor - as simple as it gets.
It also brings out another benefit of Scrape's overall design, based on the tubular stressed-engine-member Ninja chassis. I can build a variety of electric drivetrains, all on their own bolt-in subframe, and swap them out when I'm in the mood for something different. It also made me think about selling an e-bike kit based on this concept, alongside the Inhaler Project's kit cars...
Awesome look, and concept. One question, I see rear pegs, but no seating position for a passenger.
Awesome look, and concept. One question, I see rear pegs, but no seating position for a passenger.
Thanks J! I either forgot to explain that here, or it got lost in my usual drivel.
The passenger seat is a "rumble" seat that folds out of the main seat. No, it probably won't be comfortable - not the point here. The rider's seat probably won't be either because most of the space for padding will be consumed by the hidden passenger's seat.
This all gives the bike the solo streetfighter look, while retaining the ability to accommodate some of the finer things in life. The hidden seat is also why there aren't any batteries (or electronic components) in that area. I left the rear pegs exposed because I like the Ninja's peg/bracket assemblies, and it prompts people to ask - like you did.
Re: Scrape - my other E-bike project
It also made me think about selling an e-bike kit based on this concept, alongside the Inhaler Project's kit cars...
This one is a keeper. It's a motorized cycle, with great emphasis on the motor part. It's actually a part of a bigger business concept that I have been toying with (more than just vehicles or electric vehicles). I need to start shopping the whole concept around now to find the right partners.
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