A right angle gearbox?

[DeathBlade]

I'm re-rebuilding the ebike again, the plan is to mount the 1hp scott motor to the frame down tube and use a single or 2 speed right angle gearbox to run the motor to the crank and use a free wheel front.
Here is crude drawing (paint I know) of what I was thinking of a set of either straight cut or helical cut bevel gears
driving a set of spur gears on a shaft actuated by a dog clutch.

Do you think the sprockets/chain on the bike can stand the motor 1hp 24volts over volted to 36volts there is should be 4500rpm at 150rpm/volt

So helical or straight cut bevel gears? And what place to get them other than ebay?

 

[amberwolf]

Should be possible. If you don't need the 2speed you could use a powerchair gearbox. Or you might be able to use the right-angle gears out of couple of powerchair gearboxes to mesh with each other (since the shaft is usually one of the mating gears in those, you only really get one per box). Not all have 45 degree bevels, though, so you might not be able to use them at all.

 

[Miles]

http://www.sdp-si.com/

http://www.hpcgears.com/

 

[DeathBlade]

If I did my math right I'll need about a 6:1 gearing coming out of the right angle box. So I guess the bevel gears and a set of spur gears or a planetary.

edit: I just found a set of 5/8" bore 1:1 straight bevel gears for $20. So now to find a planetary I guess.

 

[amberwolf]

small 4:1 available here for about 20% of retail:
http://www.allelectronics.com/make-a-store/item/PLG-360/PLANETARY-GEAR/1.html
It's by Matex, and I think it's this one:
http://matexgears.thomasnet.com/item/all-categories/planetary-gears-torque-range-45-300in--lbs-/4mad?&seo=110
75-4MAD 70 kg-cm / 61 lb-in. 4:1 D-Cut Female Serration 228 grams

 

[e-motion]

Hello DeathBlade
I have done almost exactly what you want to do. http://endless-sphere.com/forums/viewtopic.php?f=28&t=14327 I hope this link works. Or search First build 2 speed e-bike. The bevel gears I used are straight cut and are very loud. I experimented with helical cut bevel gears and they were not much quieter. I filled the gearbox with some diff lube and it seamed to help with the noise. A good source for these gears is Mc Master Carr. They have both helical and straight cut bevel gears plus all the other gears you might need. I used 3.2:1 for high and 5.66:1 for low. I think my final drive ratio is 4:1.

Cheers

 

[Sam_Q]

90 degree gears out of an angle grinder?