belt help

[bzhwindtalker]

hie all
I had my belt system kollmorgan worcking for a week or so and yesteday I just broke the belt. idiot.
it was a whash machine belt. not HTD. system was slipping on big hills but overall it was working.
now I have nothing left to play with. OH I just made a ghetto electric solex-type bike for my bro
so I'm requesting help to find the right belt size, in htd profile.

here are the digits i found on the belt:
124021120 HUTCHINSON made in france 1280 J MAEL
I guess the number i'm searching is the red one ?


get fun

 

[Miles]

What sized pulleys do you have and what is their centre to centre distance?

Don't washing machines usually have multi-v belts? HTD is a specific type of toothed belt.

 

[spinningmagnets]

Yes! please post a close-up pic of the pulleys and the way they are mounted (with measurements as Miles asked) I think this is a clever arrangement. By mounting the machine to the V-brake attachment points, you've created a form that is easily and affordably "kit-made" for those who are unable to fabricate their own.

How has that solid wheel worked out for your bro?

When I first read about friction-drive set-ups, they sounded like an affordable way to get started (it seems everyone upgrades once they get involved with e-bikes!) And it was frequently mentioned that they slipped when wet, and, whether it was from unavoidably running through a puddle or from rain, that would be very annoying. To get extra traction, I had wondered about using a fat pneumatic tire (like in the pic below) for the friction wheel, thats why I ask about the solid wheel you're using...

 

[bzhwindtalker]

i need to shoot some pictures of my set-up
my motor is triangle frame-mounted, using a big aluminum plate and the 2x2 existing water bottle mount points.
the system was working fine but slipping on hills and dead stop accel, but performed well on level ground (40km/h)
the same with no slipping would be perfect. the bike is 18kg with motor & batts. no frame modification.
this system Is the one better I used on my prototypes bikes.
I tested :

-dual stage : mod 1 gears for first stage, existing chain-ring for second stage (7 speed) right side, motor under downtube

-dual stage : same first stage, separate fixed chain second stage right side , motor in frame

-single stage : right side chain geardown , motor in frame

-single stage : left drive using disc mount points for a plexyglass ghetto pulley.
this is my current design, and in the end I love it

now, I must admit I do many thing a bit to fast, and I don't spend the right amount of time thinking of what I will do before doing it
my rear pulley does not have tooths, it was a non issue with the motor side slipping first but maybe I'll need to upgrade this to better alloy unit, may be hard to find in 130mm size (and I don't even try to imagine the price...) they were ok to machine me one at school but they had only 90mm raw alloy....


as for the friction drive, it performed quite well, but this morning the belt broke in pieces... so with my bro we modified the system to run without the belt stage, and used a skate wheel as roller, a sandow as tensioner.
the motor is rated 24v 12A, really under-powered for me, but for the 45kg he weights, it performs well enough to get him smiling all the ride.
and yes, friction drive sucks in the rain. or when it come to overall efficiency. but to break in ebiking, it's a simple and easy solution.



hope everybody understand me, sometimes I can't even understand what I'm trying to explain


get fun