I want a Two speed clutch help!

[karl]

Hello, I am trying to re-create a fairbanks style two speed jackshaft using two regular max torque clutches for use on a go kart i am building. The only thing preventing me from doing this is the overrunning clutch. I need to find a "one way" sprocket that fits on a standard keyed 5/8 or 3/4 shaft. I am going insane researching everyday to find something that will work that
A. Does not need to be custom manufactured for a few hundred dollars

B. Not just a NOS two speed for a few hundred dollars

I cannot find a sprag bearing that will work because they are all metric. One of the solutions I found is a needle bearing that is one way, but I do not have a lathe to make it work, or trust the press fit.

Anybody have any ideas? I refuse to except that such a simple device does not exist. I can buy a comet tav ripoff for $75 but whats the fun in that? Also the motor will be a 5hp briggs and stratton flathead. Maybe I am just blind and cannot find it? Any help would be appreciated.

 

[chancer]

like this?
https://www.reddit.com/r/minibikes/comments/2hnuut/two_speed_jackshaft_awesome/

 

[karl]

like this?
https://www.reddit.com/r/minibikes/comments/2hnuut/two_speed_jackshaft_awesome/

Exactly like that, the motor has a 1in shaft so it is convenient to do it with two jackshafts, like the picture.

 

[chancer]

This may help too.From arecent discussion. It kinda rambles but there are some 2 speed links in there.

http://www.diygokarts.com/vb/showthread.php?t=32171&page=2&highlight=transmission

 

[bob58o]

I can point you to a bunch of info, but haven't found what I was looking for yet. Would love a freewheel bearing with sprocket already attached or freewheel bearing / hub that I could put a sprocket on (that is for #40 or #41 chain)

I'm also considering putting the sprag / freewheel / overrun .... on the axle.

 

[mckutzy]

That was the one I found out in the last two speed clutch topic...
He still needs the spragg bearing to engage the second clutch...
They're not cheap...
You might be able to contact a local bearing supplier to see if they can get one... Or a sample from a source that is a manufacture.

 

[chancer]

I think that is similar to the one way bearing Desert duler is using on his mini bike. (for other reasons) but still on way bearing.
http://www.diygokarts.com/vb/showthread.php?t=32273
See post #44 on page three

 

[bob58o]

I kinda gave up on this for now, but there is also the Comet 2 speed setup which is a little different and I have seen parts for sale online. The jackshaft kit is $150.
http://blackwidowmotorsports.net/_713845_universal_comet_2_speed_clutch_kit_.html
but now I forgot how each setup works. Not sure if the overrun is included here.

---------- Post added at 11:24 PM ---------- Previous post was at 11:19 PM ----------

You might have better luck here than me.
It's a list of manufacturers. Most are probably expensive.

http://www.powertransmissionresource.com/category/clutches-and-brakes/overrunning-clutches.html

---------- Post added at 11:32 PM ---------- Previous post was at 11:24 PM ----------

PTO tractor overrun clutch adapter
https://www.google.com/webhp?source...=2&ie=UTF-8#q=tractor+overrun+clutch&tbm=shop

 

[karl]

Thanks for the replies, but I keep getting to the same conclusion. Expensive or OEM. This might work, but I would need to make a spacer to adapt the id to a 5/8 shaft, and bore out the 1.5in sprocket a bit. But It could hold the torque.

http://www.vxb.com/CSK17PP-One-way-p/kit10969.htm

http://www.surpluscenter.com/Power-Transmission/Sprockets/Finished-Bore-Sprockets/22T-1-1-2-BORE-40P-SPROCKET-1-2123-22-K.axd

It aint gonna be pretty so its a last ditch option.

 

[bob58o]

OK here is what chancer pointed to

http://www.amazon.com/RC101410-Needle-Bearing-Clutch-inch/dp/B002IFSHKU

 

[karl]

OK here is what chancer pointed to

http://www.amazon.com/RC101410-Needle-Bearing-Clutch-inch/dp/B002IFSHKU

I dont have a lathe or mill so Implementing that would be extremely hard, and I mentioned the needle type one way at the getgo. But thank you for the suggestion.

 

[chancer]

It aint gonna be pretty so its a last ditch option.

Please keep us updated. This is always a popular topic. I just wanna see one that works.

 

[karl]

Please keep us updated. This is always a popular topic. I just wanna see one that works.

Ill start building the kart on the weekend so ill maybe do a build thread but if I can make it work, ill let yall know. Time to order parts lol.

 

[bob58o]

Best of luck. I hope this works! If it does, I may never finish my project.
Also, if you make an extra one, I know a buyer!!!

 

[mckutzy]

That vxb bearing is a good deal...
You could send that to a machine shop and get them to do it. Talk to them and see if they'll do a quick cash job... That's a reamer fit..they'll most likely have that no prob.

If they don't want to setup for the keyway.. Don't worry That'll take you a couple of minutes with a file/hacksaw blade to fit that....
I'm thinking I want to do that...

 

[Desertduler]

There is no such things as problems, just solutions.

 

[NewbCarter]

Well , if i may chime in :

http://fj.b5z.net/i/u/2162054/i/2_Speed_7451_Off_Road_Manual.jpg

This is a 2 speed automatic gearbox used on RC cars ( i have used one on a 26cc with 4 HP ) , and thats the schematic of it .

All i can really tell you is that it had an adjustable shiftpoint , and you can play around the gear ratios all you want .

Now , idk if this design can be scaled up , but on small RC cars it works just as you expect it to... Revs to to the shiftpoint , revs drop and you are in second gear .

 

[karl]

Well I spent $200 at surplus center and got two clutches and sprag bearings, and have all the steel for the frame so Im dedicated and I have never seen this setup on a go kart so this may be a first. Anyway build coming this weekend.

 

[chancer]

here are some diagrams.
http://www.parduebrothers.com/minibike/twospeedfairbanksminibiketransmission.pdf

 

[karl]

here are some diagrams.
http://www.parduebrothers.com/minibike/twospeedfairbanksminibiketransmission.pdf

Thanks for the diagram. I am using something similar, one dual sprocket clutch costs more that two whole ones and my motor has a 1in shaft so I am doing this (excuse my MSpaint skillz)