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Belt for 2 fixed pulleys and 2 flexible tensioners

Question asked by Jason Corl on Aug 26, 2009
Latest reply on Aug 28, 2009 by Jason Corl

I'm trying to create a belt with fixed length that runs between 2 fixed pulleys that each have a tensioner.

 

Using the assembly feature for creating a fixed length belt only seems to allow for using one flexible tensioner as it would not work with 2. As soon as I fixed one it worked fine.

 

To get around the assembly feature's aparent limitations I want to try modeling the belt with conventional methods but cannot seem to fix the belt length when it consists of 4 straight segments and 4 arcs. Pulley center-to-center and diameter, tensioner diameterand belt length are fixed. The main thing i'm trying to do is set the tensioners so that the belt runs parallel through the mid sections.

 

I tried using an equation to derive the length of the mid section on tensioned side driven by all other lengths...didn't work, over-defined sketch.

 

any ideas? Did I miss something in my constraints?

 

Thanks,

 

Edit:

 

I have tried the assembly belt feature a few more times and noticed another problem i'm having. I have one fixed tensioner (just for testing) and one with only 1 DOF. When create the belt path by selecting the appropriate pulleys and tensioners and then "try" to select "driving" belt length...I get an error saying that for driving belt length "at least one" of the components must have at least one DOF. Problem 1: one and only one of them do have 1 DOF. Problem 2: the error message says "at least one" hinting that it will accept 2 tensioners with each having 1 DOF...but I can't get it to work with a driving length.

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