new frictiondrive roller
- Thread starter Adried
- Start date
EvoBikeShop
100 W
Reminds me of a deraillur, looks good.
spinningmagnets
100 TW
"E-sy kit", $360
It appears the motor mount-plate will accept 50mm and 63mm diameter motors (I recommend the 63mm motors by a large margin). The roller appears to be a fairly smooth aluminum slug, but by the way its mounted, it also appears that it would be easy to make a replacement steel roller with horizontal ridges (like a gasoline friction-drive that was referenced a while back). Just Googled, the ".kr" suffix means the links are from South Korea.
The video shows the kit swings into the tire just like Keplers and Adrians. The specified ESC is a generic 120A and the demo video uses a 5065-350Kv, voltage is 6S LiPo.
http://easykitsport.blogspot.kr/#!/
It appears the motor mount-plate will accept 50mm and 63mm diameter motors (I recommend the 63mm motors by a large margin). The roller appears to be a fairly smooth aluminum slug, but by the way its mounted, it also appears that it would be easy to make a replacement steel roller with horizontal ridges (like a gasoline friction-drive that was referenced a while back). Just Googled, the ".kr" suffix means the links are from South Korea.
The video shows the kit swings into the tire just like Keplers and Adrians. The specified ESC is a generic 120A and the demo video uses a 5065-350Kv, voltage is 6S LiPo.
http://easykitsport.blogspot.kr/#!/
Kepler
10 MW
Quite a neat design. He has used design features from both mine and Adrian's drives and added a few of his own new design features to come up with yet another interpretation. I really like the overall CNC look to the drive. Also the concentric bush for the pivot shaft to adjust the distance away from the tire.
Would have to question how much power you could put through that little belt though. Nice to have the smaller roller and a few easy options to improve grip. Also like the plastic stop screw setup although I would question if they are strong enough. The end stops on these drives gets quite a pounding.
Other thing that sticks out is that you would need quite a large space between the seat tube and tire to fit the drive. This will cut down a lot fitting options.
For the amount of work that has gone into this drive, I think $360.00 is very reasonable.
Would have to question how much power you could put through that little belt though. Nice to have the smaller roller and a few easy options to improve grip. Also like the plastic stop screw setup although I would question if they are strong enough. The end stops on these drives gets quite a pounding.
Other thing that sticks out is that you would need quite a large space between the seat tube and tire to fit the drive. This will cut down a lot fitting options.
For the amount of work that has gone into this drive, I think $360.00 is very reasonable.
adrian_sm
1 MW
Interesting.
Price is good for the design complexity.
Still resolving the engagement challenges obviously, and does not appear to be using electronics much to help.
Placing the motor and roller in the rear triangle will limit the bikes you can fit even more than my design. Suspect that is why he has used the 5065 sized motor, which will seriously restrict the continuous thrust he can sustain before melting the motor.
The roller curvature will not do him any favours.
Eccentric cam adjustment is interesting, but could have been solved in a simpler way.
No spring counterbalance I can see.
Small belt.
Love the quick release concept.
Hmmm South Korea. On my website I set up google analytics, which can among other things tell you where the web traffic is coming from. I remember I got a weird chunk of traffic from South Korea at one stage..... coincidence?
$10 says those videos show him ripping around Seoul.
Price is good for the design complexity.
Still resolving the engagement challenges obviously, and does not appear to be using electronics much to help.
Placing the motor and roller in the rear triangle will limit the bikes you can fit even more than my design. Suspect that is why he has used the 5065 sized motor, which will seriously restrict the continuous thrust he can sustain before melting the motor.
The roller curvature will not do him any favours.
Eccentric cam adjustment is interesting, but could have been solved in a simpler way.
No spring counterbalance I can see.
Small belt.
Love the quick release concept.
Hmmm South Korea. On my website I set up google analytics, which can among other things tell you where the web traffic is coming from. I remember I got a weird chunk of traffic from South Korea at one stage..... coincidence?
$10 says those videos show him ripping around Seoul.
sk8norcal
1 MW
http://www.youtube.com/user/jjanggajo
http://easykitsport.blogspot.kr/2013/03/easykit-ebicycle-frame-parts.html
http://easykitsport.blogspot.kr/2013/03/easykit-ebicycle-frame-parts.html
Farfle
100 kW
thats an interesting one
adrian_sm
1 MW
Looks like a cross between hidden power and commuter booster, while add a few new things. Some good some bad.
There is a thread on it already over here:
http://endless-sphere.com/forums/viewtopic.php?f=28&t=48383
There is a thread on it already over here:
http://endless-sphere.com/forums/viewtopic.php?f=28&t=48383
sk8norcal
1 MW
[youtube]XRnZsWl4TeA[/youtube]
Nehmo
10 kW
I have sufficient experience with friction drive rollers to state that this kit is a design-mistake simply because the roller is too small. It's not worth any further discussion.
adrian_sm
1 MW
Yeah. Weird decision. Assume it was due to size restrictions.
Masure
100 mW
- Joined
- Mar 8, 2012
- Messages
- 42
I think Hidden Power design is smarter because the motor is not at the place you lack space. If you lack space, you'd better use an outrunner to have motor + roller the same piece just like Adrian does. This is small and complicated.
I don't understand design choices here and thus don't like it very much.
I don't understand design choices here and thus don't like it very much.
Boyntonstu
10 kW
[youtube]https://www.youtube.com/watch?v=XRnZsWl4TeA[/youtube]
No tire contact unless throttle is opened.
No tire contact unless throttle is opened.
r3volved
100 kW
[youtube]XRnZsWl4TeA[/youtube]
(you just need "XRnZsWl4TeA" between your youtube tags)
(you just need "XRnZsWl4TeA" between your youtube tags)
Boyntonstu
10 kW
need some help: (edit: you tube formatted by moderator)
[youtube]_w7oytV3HOY[/youtube]
[youtube]_w7oytV3HOY[/youtube]
Hillhater
100 TW
That's pretty much standard for most friction drives.Boyntonstu said:
Boyntonstu
10 kW
Hillhater said:
The roller is off the tire until the throttle is opened.
I have a friction drive and the roller is always in contact with the tire.
[youtube]mvrOu4hw8f0[/youtube]
If you know of another example of non-contact, I sure would like to see it.
Thanks
spinningmagnets
100 TW
Some friction drives have the roller in constant contact with the tire. Others keep the roller suspended until the drive is powered-up. The two major kits developed on ES where the drive is suspended are the Arians, and Keplers
FD index
http://endless-sphere.com/forums/viewtopic.php?f=28&t=14403
adrian_sm
http://endless-sphere.com/forums/viewtopic.php?f=28&t=22187&start=0
Kepler
http://endless-sphere.com/forums/viewtopic.php?f=28&t=16550
With the advent and ease of 3D printing, there have recently been several copies of the adrian/kepler style of FD.
FD index
http://endless-sphere.com/forums/viewtopic.php?f=28&t=14403
adrian_sm
http://endless-sphere.com/forums/viewtopic.php?f=28&t=22187&start=0
Kepler
http://endless-sphere.com/forums/viewtopic.php?f=28&t=16550
With the advent and ease of 3D printing, there have recently been several copies of the adrian/kepler style of FD.
Boyntonstu
10 kW
WOW!!! I am so glad that you responded with wonderful projects.
I am inspired to go with the outrunner motor.
When you compare a 1kW hub motor to a outrunner, there is no competition with respect to size, weight, and efficiency.
Is there data indicating the longevity of the motors?
(I understand that some outrunner motors have lifetime warranties too!)
My longest lived project is my $100 elevator.
It demonstrates what can be done with very inexpensive components.
[youtube]-fKyZ9v_65o[/youtube]
I am inspired to go with the outrunner motor.
When you compare a 1kW hub motor to a outrunner, there is no competition with respect to size, weight, and efficiency.
Is there data indicating the longevity of the motors?
(I understand that some outrunner motors have lifetime warranties too!)
My longest lived project is my $100 elevator.
It demonstrates what can be done with very inexpensive components.
[youtube]-fKyZ9v_65o[/youtube]
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