Torque and power Distribution through a Two Stage Belt Drive

[billinr]

Hello All
I am new to power transmission design and I am attempting to calculate belt tension in a two stage drive. I am having difficulty in determining the required tension in each stage.
I have a 7.25:1 ratio in each drive, although the pulley sizes are different. The first stage drives a jackshaft which is then linked to the flywheel with the second belt.
Disregarding any bearings or friction, there is no load on the first stage.
The question:
If I have a maximum torque input of 110N, how is that distributed / calculated through the system? Would I split the total on each belt (because the ratios are equal), or do I calculate the entire load on the second stage?
How much work is contributed by the first stage?
And, for future reference, if the ratios were NOT equal, how would this affect the calculations?

Thank you in advance for any assistance.

 

[drawoh]

billinr,

Each speed reduction increases the torque, and the belt tension.

Are you using timing belts, or some kind of friction belts? If they are friction belts, you have to work out initial tensions.

Your question is absolutely basic machine design. If you do not know this, there is a whole pile of other stuff you do not know.

JHG

 

[hydtools]

billinr,
What do you mean there is no load on the first stage? It is driving the second stage.

Ted

 

[bithkits]

"billinr,
What do you mean there is no load on the first stage? It is driving the second stage. "

I think he means the first stage only drives the second stage i.e. there is no additional output from the first stage shaft. But, I am not too sure myself

Adriaan.
I am an Engineer/part time student (Mechatronics) from South Africa.
Advice from lecturer: "Be warned - when you go into industry your boss will give you a thousand things to do and he wants them done yesterday!" So far he is right...