2speed questions

[Kaptain Krunch]

Ok here we go, so pretty much, the clutch tensioner will side back and forth to switch between the two belts, one belt will run a 1:1 ratio the other a 1:2 ratio. There will be a primary reduction of around 6:1 by chain. the tensioner would be operated by foot pedal, when pedal is pressed tensioner is off. there would also have to be a clutch pedal lock for starting.

 

[mike75925]

the bmi kit is really close to the r/c car's. except for gear to gear to belt.

 

[EagleTalons]

Heck Kap'n I was thinkin' of like a 5:1 or 4:1 final ratio!

 

[Kaptain Krunch]

If i were doin this i'd have a 16hp kohler, so 3:1 or even 2.5:1 would be fine for final high speed ratio.

 

[t0x1k]

Why not recreate the derailleur on a bike?
Pretty simple, one way bearings, tensioner, derailluer, 2 size sprockets.
You could make a belt drive between the chain and wheels to act as a clutch.


I'm tired, not making much sense am i?

 

[burningmetalmaniac]

I was just thinkin of the same type of thing, kind of, bear with me here;
for a cart, with enough room; cent clutch on motor driving a jackshaft with a stepped pulley (3 grooves increasing in size) three belts; slack at rest with a similar but reversed pulley on the axle and a manual shifter for each that would put tension on the belts as you wanted. three individual shifters kinda like the funny car shifters, you could make a gate and set it up so as you pull the next one down it would pop the previous one back up, not sure about downshifting though.

 

[Lex]

Woot, someone else is following the same trains of thought i am... The 2speed belt driven and dual sprocket clutch idea.

Hijack for more info -> Any idea on how easy it'd be to make the jackshaft work in the dual sprocket idea? How would you make a sprocket freewheel?

Edit: Yep, totally after a quick look around I really want the two speed, Get the advantage of a fast accel low top end on the first chain, then once thats nearing its highest accel have the second gear kick in for that mid to top... i guess this could be done for a multi gear auto tranny I'll let you know how this goes once i start with a 2 speed.

 

[burningmetalmaniac]

I'm going to try and design one tomorrow with the belt drive because I can't seem to find a freewheeling #35 chain sprocket, so my original Idea is scrapped

 

[Raywelder]

I'm going to try and design one tomorrow with the belt drive because I can't seem to find a freewheeling #35 chain sprocket, so my original Idea is scrapped

What if you were to weld a sprocket to a free wheeling one off of a bike.

I actually might have a sprocket thing off of a scooter that you could bolt one too.

 

[born loser]

I believe BMIkarts.com has a #35 freewheeling sprocket.
....but it might only come as a part of their 2 speed jackshaft kit.

 

[Raywelder]

How does the 2 speed clutch system work?
I'm mechanically minded, so Usually I can figure out stuff like this.
But I'm not quite sure I understand how this one works.
lol

 

[born loser]

clutch on engine has 2 sprockets instead of the normal 1. 2 chains run to the jackshaft. 1 chain runs to the one-way sprocket on the jackshaft, and the other runs to a clutch on the jackshaft. when you accelerate from a stop, the engines clutch drives the one-way clutch...and the 2nd chain just spins the shell of the clutch on the J-shaft. as you pick up speed (rpms), the JS is spinning faster and faster, eventually engaging the clutch on the JS. That is your shifting point into 2nd gear. Now the engine clutch is driving the clutch on the JS, and the other chain is freewheeling.
Its kind of weird to try to visualize it...hope this helped.

 

[Raywelder]

clutch on engine has 2 sprockets instead of the normal 1. 2 chains run to the jackshaft. 1 chain runs to the one-way sprocket on the jackshaft, and the other runs to a clutch on the jackshaft. when you accelerate from a stop, the engines clutch drives the one-way clutch...and the 2nd chain just spins the shell of the clutch on the J-shaft. as you pick up speed (rpms), the JS is spinning faster and faster, eventually engaging the clutch on the JS. That is your shifting point into 2nd gear. Now the engine clutch is driving the clutch on the JS, and the other chain is freewheeling.
Its kind of weird to try to visualize it...hope this helped.

Ah, I got it now,
The freewheel clears it up to me.
Before I was wondering how it would work if the clutches were fighting eachother.
It makes sense now !

 

[mike75925]

the freewheeling is accomplished by the same means as if you put a regular cent clutch on the axle. the way first gear works is through a one-way bearing.