Mid Go kart Build and looking for advice

[gone_walkabouts]

Hi guys,

I am building an electirc go kart for my sons. I have mostly all of the component but need some ideas on overcoming a couple of engineering type issues. I imagine there is a bit of experience here on the forum.

The electric kart is a conversion from a petrol kart. I have have an electirc motor with a 10mm shaft (around 3/8 of an inch i think ). The drive sprocket that I want to re-use from the petrol is made for a 25mm (1 inch) shaft.(see pictures) It is possible to get a convertor between the sizes? if not who would do a customised conversion.


Pictures attached of shaft and sprokets.

The other issue I need to resolve is how to mount the electric motor on the kart. It is round and will spin if I do not secure it properly. :rolleyes3:
It does have to holes in the motor that will allow me to put 2 bolts into it. These holes are at the opposite end of motor from the drive shaft.











The motor is tested and ready to go, I just need to get these two issues work out, then let the kids go wild in it.

Any help is muchly appreciated.

Dave
Brisbane, Australia

 

[saebajacaptain]

I had sort of the same issue for my electric cart, which you can see in one of my albums if you want to check it out. it had four front threaded holes, but none for the rear, so i made a mount for the front and for the rear i took a piece of flat steel, wrapped it all the way around the engine, then cut it to the length i wanted, bent both ends up (away from the inside of the circle) drilled holes through the ends, then ran a bolt through the ends, making a sort of giant circular clamp, which i was then able to weld to a mount i had created for such purpose, or you could weld it to the frame or whatever, just a suggestion. As for the hub, if i was not in another state right now and was at my shop i would be able to just make something for you. If you could find a small sprocket which had two flats it could be bolted onto the shaft as it appears it has two flats, and then have a jackshaft for the clutch (if going that route) i never used a clutch as i had a belt drive and allowed for just enough slippage off the start to still blow the tires loose but not make it uncontrollable, OR if you could get lucky enough to find a sprocket/clutch small enough to fit snug on the shaft, you could put a key piece on the flat part of the shaft, slide on your sprocket or clutch, then bolt it on, as it seems the end of the shaft is threaded, assuming the threads would be easy to match, with a bearing or spacer on the backside, like i said, if i was near my shop or had access to a lathe i would make you something but thats just how it works for me.

 

[gone_walkabouts]

thanks saebajacaptain.

I saw the electric motor mount in your pictures.I will use a plate too to help secure the motor and stop it from spinning. I will be able to use fastener straps for the rest as it is only a 500 watt motor. I think I have that covered now ...cheers


Also will the sprocket, unless someone else come up with a brighter idea I am going to weld a solid plate onto the back of the orginal old clutch cover. (as pictured in orginal post.) From the I can get someone to cut out the shape of the electric motor shaft and bolt it on just like the orginal small sprocket was.

When I upgrade to a really powerful electric motor and controller, I can cut a bigger hole out for the bigger shaft.

Thanks for your help and ideas.

gone_walkabouts

 

[r97]

Unless I'm missing something, since it's an electric motor, you don't need a clutch, simply bolt up a sprocket.

 

[gone_walkabouts]

Definitely does not need a good old fashioned clutch, however getting a sprocket for the electric motor in a challenge....The sprocket I have that suit the orginal chain and larger sprocket from the kart has a 1 inch diameter however the electric motor shaft is 3/8 of an inch.

I figured I could reuse the clutch cover with out the clutch as the drive sprocket is mounted in the clutch cover.

Doies anyone know where I can source a sprocket that will bolt straight on to the electric motor shaft and suit the chain and large sprocket I already have?