automatic 2 gear jackshaft

FurryOnTheInside

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Sep 23, 2013
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3,292
so, coming back to the 2 shaft (jackshaft) configuration, I order the rest of the pieces and should arrive this week. I'll keep updating
Yeah that's why I log in here. Keep going working to achieve your engineering dream and you'll get there! :D
 


dmopedMA

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Apr 14, 2017
Messages
141
Well, more issues on the way... I realized yesterday a flaw on the 2 shaft configuration I was planning the second shaft didn't get enough speed to engage the clutch... so I came up with (I hope) a final solution that I'll test on the bike this weekend, it is based on the same design than the schema below, but all the stuff I have on the main shaft will be on the secondary one and the main shaft and the secondary one will be connected wit two 10T sprockets, spinning at the same speed and at the same time having more room to fit the clutch.

Here a diagram:
View attachment 82778

Explaining it:
- First gear will be on the right side of the wheel using a freewheel 44T sprocket (SBP has the freewheel adapter and sprocket), maybe a 48T if 44 is too small.
- Second gear will be on the left side of the wheel using a regular 40T sprocket.
- Centrifugal clutch will be as before on the shaft and will act as "freewheel" when on first speed.
- I'll use bike chains well lubricated and avoiding tensors as much as I can.
- Longer shaft will be hold on the right side with a jackshaft bearing to keep it in place.
 

JerboaJohn

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Jul 29, 2018
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would the right-side gear need to be freewheel for when the clutch engages, jackshaft starts spinning even more rpms so not to be bogged by the right-side?
 

dmopedMA

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Apr 14, 2017
Messages
141
would the right-side gear need to be freewheel for when the clutch engages, jackshaft starts spinning even more rpms so not to be bogged by the right-side?
absolutely, "first" gear needs freeweel, I got a 48T sprocket with freewheel from SBP, just trying to get some free time to put everything together...
 

JerboaJohn

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Jul 29, 2018
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ah ok. im getting a little more understanding now until I get to my drivetrain. TY. it looks simple, just some fabricating/mounting
 

LR Jerry

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Mar 14, 2011
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This is how I got around the automatic transmission requirements here in Tennessee.


One could also use a Kilduff auto shifter or modify a LandRider auto shifter to shift internal geared hubs as well.

 

dmopedMA

Member
Joined
Apr 14, 2017
Messages
141
This is how I got around the automatic transmission requirements here in Tennessee.


One could also use a Kilduff auto shifter or modify a LandRider auto shifter to shift internal geared hubs as well.

Thank you for the videos and the ideas! my OCC does not have gears itself and adding them is not cheap... but I like your idea!
 
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