best way to make a distance only constraint between rbe elemts?

I'm trying to solve nonlinear contact analysis for Chain drive with 2 sprockets drivetrain system. This is what giving me a hard time now.

The way I modeled my chain is using shell component with rbe2 dependent node on center of chain shell and independent nodeson each nodes on shell. After I linked all the shells with several types of rbe's(rbe2,rbe3,rjoint) between the dependent nodes in chain shell. The result shows each chain shell does not constraint enough. I wonder is there anyway to give a distance only constraint between 2 rbe elements?

the chain model contacted to drive sprocket didn't give a type of effect on driven gear contatcted chain model.

I failed to converge the NL so I tried Linear Static first and got a problem.

the sprocket looks like it is just not rotating and the size is keep increasing. I can't find out what's wrong on my model. Is there any possible cause for this?

Thank you.