DIY Gearbox? + help

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ErikDIY

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Hi forum.

I'm kind of new here so please help me.

So this is the deal, I'm now on my second Go kart, and I wanted to make this a little more professional than the other. My fist Go kart was just made by scrap, and things I had lying around.

So what I have been thinking about is to make a Go kart that can have torque and speed. I know that I could just buy a torque converter, but I don't have the money, and beside. Its fun to make thinks on your own.

My plan is to use a centrifugal clutch and a second gear ration.

What I then have thought about is to have two gears. I want to make a low-speed gear, and a high-speed gear.
So the question is how can I do this?
I know how lawn mower gear-boxes work, so my first thought was that I could use something like that, but then I had to get the engine to go backwards or have en engine with vertical axle.
(If I wanted to use a lawn mower gearbox)

I then thought of something like a chain clutch. For example, if you could have a sprocket with a one way clutch on the back, and a second sprocket with a lover gear on the same axle. You could then just use the low speed like normal, but you could then switch over to high speed. I could then use a chain sort of clutch mechanism to engage the high speed?
Soooo, is this plausible, or do any of you have any other good ideas??

Thanks! :auto:
 

r97

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ok, the last thing you described is known as a 2 speed jack shaft.
-clutch on engine powers two chains
-one chain goes to a free-wheel sprocket for low gear
-the second chain goes to a centrifugal clutch on bearings
-when the cent clutch engages, it begins to turn the shaft that has the free wheel on it.
-the cent clutch turns the shaft faster than the free wheel (because it is geared differently), so the free wheel disengages, and your in high gear.
heres a picture:



http://www.diygokarts.com/vb/showthread.php?t=8913&highlight=speed+jack+shaft
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other options could be:
- a lawn mower style gear box link
- a 2 speed belt tensioner link
- i also had an idea on using either electric clutches, or disk brakes as separate clutches for each gear ratio to make a multi speed transmission.







EDIT: blue beat me!
 

ErikDIY

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Hi "r97"
That's some great work!
I'll perhaps try it, I do have two clutches...

Thanks for the help so far guys :)
 

r97

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do lots of panning first!

thanks! are you commenting on my posting skills? unfortunately i didn't make that mini bike.... LOL
 

DMCdesign

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I had seen somewhere that the brit company zeroshift has developed a clutchless multi speed gearbox that uses two interlocking rings that changes gears effortlessly while offering almost zero torque loss and a rise of 10% in efficiency
 
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