ElectricMotorcycleForum.com

Tech => Home Brew => Topic started by: Ben Modified on December 20, 2014, 08:35:43 PM

Title: Pedal Electric Motorcycle
Post by: Ben Modified on December 20, 2014, 08:35:43 PM: I suppose that I should have posted this in the HomeBrew category to begin with.

http://youtu.be/8myvwJ6Uv2E (http://youtu.be/8myvwJ6Uv2E)

More photos and video on my blog. Pedal cadence is the same 70 rpm pace no matter the speed. Pedaling is optional. Top speed recently reduced to 65 for lower motor temp.

www.BenModified.com (http://www.BenModified.com)
Title: Re: Pedal Electric Motorcycle
Post by: Richard230 on December 20, 2014, 10:01:21 PM: That whatever-it-is is a kick! ;D

I'll bet the DMV had their brains scrambled trying to figure out how to register that "bicycle" for the highway. ;)
Title: Re: Pedal Electric Motorcycle
Post by: Heysheney on January 09, 2015, 01:33:36 PM: Can learn on own or not.
Title: Re: Pedal Electric Motorcycle
Post by: Ben Modified on July 30, 2015, 04:13:06 AM: A momentary pause from reliability. After 2000 miles of trouble free ridingâ€¦â€¦

(https://lh3.googleusercontent.com/-bBwVx5njxP0/VbgKUSw1pvI/AAAAAAAABZw/PPP7_vaSt20/s800-Ic42/20150728_155302.jpg)

Build Videos here:
https://www.youtube.com/user/TheGreenVW/playlists (https://www.youtube.com/user/TheGreenVW/playlists)
Title: Re: Pedal Electric Motorcycle
Post by: Erasmo on August 04, 2015, 02:42:37 AM: You make some slick stuff...

Have you already figured out what happened to the gear?
Title: Re: Pedal Electric Motorcycle
Post by: Ben Modified on August 05, 2015, 11:34:08 PM: Quote from: Erasmo on August 04, 2015, 02:42:37 AM
You make some slick stuff...

Have you already figured out what happened to the gear?

Thanks! Yes, i figured out why it failed. I believe it was a combination of two factors. One, the motor uses a woodruff key (small half moon shape) which does not come close to using all of the keyway of the sprocket. So a lot of torque focused on a small area. Second, the combination of a 7/8" thick motor shaft and a small number of teeth (10), requires that the sprocket be recessed on one side to make room for the chain. This recess leaves very little metal thickness at that point and creates a weak spot. In my case, the woodruff key was directly below the weak spot of the sprocket and it failed.

(https://lh3.googleusercontent.com/-lXOUtAewPnU/VcJDLvG9JII/AAAAAAAABc0/4ZGpsYdkK-M/s800-Ic42/20150805_095452_resized.jpg)

To solve the problem, I am swapping the 60 tooth rear sprocket for an even larger 71 tooth and the front 10 to a 12 tooth. Larger diameter front sprocket equals smaller recessed area, so stronger sprocket. Both sprockets are larger and the combination yields the same gear ratio as before.

(https://lh3.googleusercontent.com/-zyXqTxaUIVE/VcJDKXDq9TI/AAAAAAAABcs/iao0kduPlcs/s800-Ic42/20150805_095514_resized.jpg)

YouTube Link to Build Videos:
https://www.youtube.com/user/TheGreenVW/playlists (https://www.youtube.com/user/TheGreenVW/playlists)
Title: Re: Pedal Electric Motorcycle
Post by: Ben Modified on August 11, 2015, 06:29:07 AM: (https://lh3.googleusercontent.com/-_2vKkQOIfyk/Vckr8CbmRtI/AAAAAAAABjE/lSy1uh1vhXs/s576-Ic42/20150810_114534_resized.jpg)
Title: Re: Pedal Electric Motorcycle
Post by: Erasmo on August 11, 2015, 01:43:51 PM: Looks good!