Hi Everyone.
First i need to say hallo because i'm newbie here.
Second, if someone won't undestand me please ask, i will expalin what i meant - I'm from Poland and i'm not perfect in english
Third, it will be a long post
About year ago i have seen e-bike in music video https://www.youtube.com/watch?v=mEcePRasi4Q and i had fall in love.
For this time i spent all free hours for reading and searching for informations in ebike category.
In the same time i finished study and i recieved mechatronic engineer diploma (without brag)
So i decide to make my own vision of powerfull ebike.
I meet some people who have monsterbikes with QS 205 motors, i taken few rides offroad and on asphalt and i was ensured about way which i will design my ebike.
below you can find list of issues which i decide to solve:
1 - ebike will have central motor but this motor will be a hub motor. I decide to make universal frame for QS 205 and QS 273 because this motors it the most used and standard in my country.
2 - frame will be universal - it means that all weight and height person will find good position on it.
3 - i had take few rides on Stealth type hub motor ebike with QS205 (150A from Sabvoton) and i was satisfied, but friend (who is owner of this ebike) told me that this motor warming up dangerously and sometimes thermal protection sensors cutting out power. So i decided to make grarbox by mine, between motor and rear wheel, to reduce power needed to move in forests, dowhill etc.
Thats where idea borned. I had opened my school licenced autodesk inventor and i started to learn it and make some drawings of shapes of ebike. Main inspiration was been Albatros enduro from this forum and Neematic FR1. Based of this 2 project i decided to make frame from pipes.
The most important part for me was gearbox because it will make my ebike unique.
Firstly i tryed to addapt Shimano Alfine but powers which i will put on it makes me affraid of living time of this hub so plan was abandoned. Also I've seen few projects of bicycle gearboxes (Effigear, Pinion) but it was protect by patent law so i decide to make gearbox based on motorcycle one.
Below plnas which i set to myself.
Max revolutions 1:1 motor to wheel will give me about 90km\h speed. I don't need more in hard terrain son i will reduce recoutions on wheel to recive more Nm on it and to protect motor for overheat.
- gear 1 - ratio 2:1 - 1 rpm of motor will give me 2 rpm of wheel and about 45 km\h of max speed
- gear 2 - ratio 1,66:1 - 1 rpm of motos will give me 1,66 rpm of wheel and about 60 km\h of max speed
- gear 3 - ratio 1,33:1 - 1 rpm of motos will give me 1,33 rpm of wheel and about 75 km\h of max speed
- gear 4 - ratio 1:1 - 1 rpm of motos will give me 1 rpm of wheel and about 90 km\h of max speed
photo from designing process
after it i decidet to produce subparts
project was too precise and gears wont' move so i decided to put valve paste on it and let it rotate on radial drill
after assy
after this operations i recieved ready gearbox which is already closed and filled with oil.
Next i tryed to make full ebike project with all components like motor, wheels, frame and gearbox.
First prototype looks like this and it was abandoned because i wasn't happy of rear swing arm.
It looks terrible because all frame had 140mm width but swing arm (mounted on QS axis) were about 60-70 mm more width.
I didn't happy of it and i started again with new project regarding to knowledge recived from this project.
Second version of this project created few problems with gearbox so i decide to resign.
It was too big and heavy - better idea will be to make 2 or 3 changeable sprockets on rear wheel and chain tensioner.
Also here i decide to use QS 273 in the same frame and make it unversal for both QS 205 and 273 hub motors.
Below you can see results
Also tere was one more thig that i decide to abandon - it was pedals. I dont have idewa where to put i because motor was placed on siwngarm. Maybe i should remodel it and remove QS from swingarm and connect it from pedals?
Please let me know your opionins about this project, i will be very happy for your comments.
Is this way is a good way? Or maybe should i change something? What do you thinking about it?
Kind regards for all who readed it
let the force be with you
I don't have YT, Instagram or Facebook channles, its too early to show this project. Maybe i will create it when i will start to produce parts for ready version, now i don't have time for this actions - i prefer to waste time for designing
You are the first who can see this ideas
First i need to say hallo because i'm newbie here.
Second, if someone won't undestand me please ask, i will expalin what i meant - I'm from Poland and i'm not perfect in english
Third, it will be a long post
About year ago i have seen e-bike in music video https://www.youtube.com/watch?v=mEcePRasi4Q and i had fall in love.
For this time i spent all free hours for reading and searching for informations in ebike category.
In the same time i finished study and i recieved mechatronic engineer diploma (without brag)
So i decide to make my own vision of powerfull ebike.
I meet some people who have monsterbikes with QS 205 motors, i taken few rides offroad and on asphalt and i was ensured about way which i will design my ebike.
below you can find list of issues which i decide to solve:
1 - ebike will have central motor but this motor will be a hub motor. I decide to make universal frame for QS 205 and QS 273 because this motors it the most used and standard in my country.
2 - frame will be universal - it means that all weight and height person will find good position on it.
3 - i had take few rides on Stealth type hub motor ebike with QS205 (150A from Sabvoton) and i was satisfied, but friend (who is owner of this ebike) told me that this motor warming up dangerously and sometimes thermal protection sensors cutting out power. So i decided to make grarbox by mine, between motor and rear wheel, to reduce power needed to move in forests, dowhill etc.
Thats where idea borned. I had opened my school licenced autodesk inventor and i started to learn it and make some drawings of shapes of ebike. Main inspiration was been Albatros enduro from this forum and Neematic FR1. Based of this 2 project i decided to make frame from pipes.
The most important part for me was gearbox because it will make my ebike unique.
Firstly i tryed to addapt Shimano Alfine but powers which i will put on it makes me affraid of living time of this hub so plan was abandoned. Also I've seen few projects of bicycle gearboxes (Effigear, Pinion) but it was protect by patent law so i decide to make gearbox based on motorcycle one.
Below plnas which i set to myself.
Max revolutions 1:1 motor to wheel will give me about 90km\h speed. I don't need more in hard terrain son i will reduce recoutions on wheel to recive more Nm on it and to protect motor for overheat.
- gear 1 - ratio 2:1 - 1 rpm of motor will give me 2 rpm of wheel and about 45 km\h of max speed
- gear 2 - ratio 1,66:1 - 1 rpm of motos will give me 1,66 rpm of wheel and about 60 km\h of max speed
- gear 3 - ratio 1,33:1 - 1 rpm of motos will give me 1,33 rpm of wheel and about 75 km\h of max speed
- gear 4 - ratio 1:1 - 1 rpm of motos will give me 1 rpm of wheel and about 90 km\h of max speed
photo from designing process
after it i decidet to produce subparts
project was too precise and gears wont' move so i decided to put valve paste on it and let it rotate on radial drill
after assy
after this operations i recieved ready gearbox which is already closed and filled with oil.
Next i tryed to make full ebike project with all components like motor, wheels, frame and gearbox.
First prototype looks like this and it was abandoned because i wasn't happy of rear swing arm.
It looks terrible because all frame had 140mm width but swing arm (mounted on QS axis) were about 60-70 mm more width.
I didn't happy of it and i started again with new project regarding to knowledge recived from this project.
Second version of this project created few problems with gearbox so i decide to resign.
It was too big and heavy - better idea will be to make 2 or 3 changeable sprockets on rear wheel and chain tensioner.
Also here i decide to use QS 273 in the same frame and make it unversal for both QS 205 and 273 hub motors.
Below you can see results
Also tere was one more thig that i decide to abandon - it was pedals. I dont have idewa where to put i because motor was placed on siwngarm. Maybe i should remodel it and remove QS from swingarm and connect it from pedals?
Please let me know your opionins about this project, i will be very happy for your comments.
Is this way is a good way? Or maybe should i change something? What do you thinking about it?
Kind regards for all who readed it
let the force be with you
I don't have YT, Instagram or Facebook channles, its too early to show this project. Maybe i will create it when i will start to produce parts for ready version, now i don't have time for this actions - i prefer to waste time for designing
You are the first who can see this ideas