Reverse Positioning

[Beelady]

Ok, this may be a dumb question but I'm still learning on this, but here we go anyway. Can you switch the positions of the secondary pully off the cvt with the output sproket on the transmission? I have a room issue if I keep the current design, and of course the first thing that popped into my mind was to switch these so the CVT can line up, that or turn the trasmission around and create a new shifter for forward an reverse. Any comments/ideas?

[Robio_8x8]

I do not fully visualize what you are saying…

Can you post Pictures? Or get Beeman to make cool design diagrams?

If you want to swap positions of the driven pulley and the out put shaft sprocket I can say I have never seen it done but if I were to try it I would add some type of pillow block bearing near the end of the output shaft sprocket for support. This will make servicing and changing the belt tricky if I am visualizing what you are saying correctly

[Beelady]

Ok, well I did my best in powerpoint for some pictures of what I'm talking about, I don't know how to inset the pic's so I attached them. Doing this or a version of up (turning the whole transmission around) would smplify my problem, I would just have change the sprocket location that the output sprocket connects to. I that makes sense.

[Robio_8x8]

So there is just one output sprocket?

Ok I was a bit confused because most transmissions I have seen have a left and right output sprocket and I thought you wanted to switch the CVT clutch and one of the out put sprockets making it so you would need to take a chain off to change a belt.



Now that I see that there is only one output sprocket I do not see a problem with switching it unless the reverse gear is too low of ratio compared to the forward gear.

You can check the ratio by turning the input shaft counting the number of times it takes to make the output shaft to do one full rotation. Try this in forward and see if it is the same in reverse.

If the ratio is the same I do not see a problem but you are usually using more gears to go in reverse mode then forward mode so if you were plowing snow or doing something that demeaned allot of torque and power often the transmission may go prematurely.

So if you need to pull Beeman out of a jam do it in reverse


Is the differential a separate part from the transmission on you Amphicat?


[

[Beelady]

I'm not sure what you mean exactly by differential, do mean the clutches or something else? It goes from the engine to the transmission box directly then to the clutch/break assembly.

[Mike]

What kind of transmission is it? Is it a T20?

[Robio_8x8]

The differential separates the left and right side

On your illustration it shows only one output shaft from the transmission so some how after that it needs to separate to a left and right side.

This is so when you turn it each side can go different speeds





So the transmission only has one output sprocket?

[Beelady]

Yes, there is only one output shaft from the transmission. Here is a pic, maybe it will help, the metal area shaped in a box is where the transmission sat. The driven pulley on one side the output sprocket on the other which is connected via chain to the sprocket you see to the left of the metal box framing, which is connected to the shaft that the clutchs/brakes are on. It goes from there via more chain from each clutch assembly to the shaft that connects the drive to each side. I hope that makes sense, if not the photo should help.

[Beelady]

Beeman told me that maybe you guys would call the tranmission box I'm talking about just a gear box, and that maybe that is were the misunderstanding is from, sorry. But I think the picture should sort of clarify things.

[Robio_8x8]

I would say you can but get a second opinion

Sorry for all the questions but unless I know the set up I couldn't say if you were able to flip the transmission around or not.

I would say you can do this

my concerns would be does reverse gear become forward now?
If so then just relabel the control unless the reverse is too low of a gear ratio to get any speed .
If the reverse and forward are back words and it goes too slow in the forward direction add a gear to the output sprocket to correct direction.

If reverse and forward are the same speed do not bother going through the trouble of correcting output sprocket rotation maybe re label gear shifter indication

[Beelady]

my concerns would be does reverse gear become forward now?

I don't think the gears will switch. I'm not turning the transmission around as a unit, which would then result with the back being forward and such. I'm just switching the diven pulley with the sprocket (transmission remains facing forward) so I would think that would mean forward would still be forward....I hope.

[Robio_8x8]

Ok I assumed it would be flipped 180 deg.

My concerns now would be the step down ratio if any between the input shaft and the output shaft .
So you are removing the driven pulley from the input shaft and the sprocket from the output shaft then switching them?
I would like to know if that gear box steps down the gear ratio. If it does I would like to know by how much.
You can find this out by rotating the input side one full rotation and see if the output side turns the same amount or not.
Are the input and output shafts the same diameter?

I also thought of another problem if you flip the whole thing around. Were are the controls on this gearbox, side or top?
This could be the easier way if Forward and Reverse are equal.

[Beelady]

My concerns now would be the step down ratio if any between the input shaft and the output shaft .
So you are removing the driven pulley from the input shaft and the sprocket from the output shaft then switching them?

Yes, well thinking about it anyway.

I would like to know if that gear box steps down the gear ratio. If it does I would like to know by how much.
You can find this out by rotating the input side one full rotation and see if the output side turns the same amount or not.
Are the input and output shafts the same diameter?

The ratio in both forward and reverse is 2 full turns of the Diven pulley to get 1 turn on the output. Yes the shafts are the same diameter.

I also thought of another problem if you flip the whole thing around. Were are the controls on this gearbox, side or top?
This could be the easier way if Forward and Reverse are equal.

I have considered just turning the whole around, its still an option, but the controls come out of the side and need to be turned, like a key in a lock to switch between F and R.

[Robio_8x8]

Flipping it 180 deg. seems the best way

It could be a pain making a linkage to shift gears but flipping it may be the way to go if forward and reverse gear ratios are the same.

Switching the Input and output of the transmission will loose your torque if it the engine doesn’t just stall. I know you will have some ample torque with that diesel but going from a 1:2 ratio to a 2:1 ratio would be over doing it.