Lead screw constraint problem

[KS_10897574]

Hello, I am designing a mechanism in which I want my Lead screw to rotate on its axis only.  fixed to one housing so that the lead screw does not transverse, I want the nut to translate but avoid rotation 

I already tried the cylinder connection but it is not working for my problem 

And if anybody suggests providing a generic gear connection please also describe the reason behind it I am not able to understand the reason behind providing a gear connection 

I am using Creo Parametric 

[tbraxton]

The gear connection could be valid as it can be kinematically valid in describing the motion to the solver. Obviously, you must define the connection in a way that is consistent with the kinematics of your design. There is a relationship between the rotation of the lead screw and travel of component driven by the screw.

If you consider a rack and pinion mechanism (gear pair), you can create one which is the kinematic equivalent of the lead screw mechanism. It results in the same linear motion.