2 speed shifting tranny

[Harold in CR]

For anyone still looking for more info on this build, here are the latest photos.

I used a heavy type wood for the sides and ends. I want to use a machine shop to true up the shafts to fit bearings, and cut out the holes that will receive the bearings. Then, I have to build the Bike to try this thing out. I don't think the gearing is all that far out. I'm going to gear the bike low enough, so the low gear in the tranny is still very low, to climb the hills.

I don't have the money to just buy a bunch of batteries, controller, throttle and accessories, to set the bike up for steady use. This is mostly for experimenting.

2 photos look like repeats, but, 1 shows the low gear engaged and the other shows high gear engaged.

The wood is all cut 5/8" thick. The box measures 4 7/8 " wide X6 3/8" long X 3 3/4" high. I allowed 5 1/2" of side to mount the motor. All measurements can-will be shaved down a bit more. I'm guessing total weight as seen is around 10 pounds. I have no scale.





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[AussieJester]

Very cool "re-purposing" of motorcycle gearbox Harold, definately won't have to be worrying about themz gears breaking, now why didnt you tink of this earlier ThudSTeR

Best of luck getting ht finished and installed harold, perhaps u could hit JJ (John in CR) up for some of those konion cells he has been hoarding so you can get mobile.

KiM

 

[Harold in CR]

Thanks, AJ. It's been quite a few years since I did any metal work to speak of. I don't have much more then you for metal working tools. I have more stuff in Fl., but, shipping is a bear. I would have my son sell some of it and buy down here, but, the economy and all, just doesn't work.

Here is a photo of our last real metal working project, back in 2002.



Built entirely from scratch. Completely mobile, and, can saw logs up to 38" dia and 25' long.

 

[John in CR]

I don't know about batteries, but I could put that tranny to good use mated to a big brushed motor I have. I also have a little lawnmower tranny that could use a similar reworking and would be a smaller better match for a bike. Maybe there's a workable trade somewhere, since I have motors too.

 

[Dee Jay]

Damn! brilliant idea...sucks I didn't think of it. surely there are smaller lighter parts from smaller motorbikes

 

[floatingdog]

Harold,

You are well on your way, but here is another motorcycle tranny candidate for future consideration. It is the 40+ year old Hodaka transmission capable of handling the power of an early 70's vintage 100cc 2 stroke. It is still cheap and available on eBay. It is very narrow and works by popping ball bearings up under the free gears to engage them. Shaft 16 pulls part 20 underneath the bearings to engage a gear.

You can't see it in these pictures, but the fixed shaft is splined and the gears can be slipped off. If you want it to be more thinner, it looks like some machine work could change it into a 2 or 3 speed tranny using any of the available gear pairs.

On the actual bike, it shifts nicely without the clutch by just dropping the power when changing gears.

Search eBay and Google for more pictures.

 

[John in CR]

Great info Floatingdog. Those parts are cheap, and the way the shifting works it seems like very little in machine work would be needed. Maybe I won't go retro-direct after all. Thanks for pointing that out.

 

[Beavinator]

http://www.youtube.com/watch?v=rj6naPPiQOw