Structural analysis of a bullwheel on Ansys

Hi everybody,

I have some problems with the structural analysis of an drive bullwheel on Ansys.

How can I apply the load on the bullwheel groove? 

Tangential (constant) and normal components

I was thinking to apply the normal load using a prep>loads>define_loads>apply>FUNCTIONS but I'm not good at this option. Is it necessary to define a particular coordinate system?

The mesh has been done with the SOLID186. I need to introduce the ESURF for this type of load, how can I do that?

Thank you very much. I'm an student and this is my first work with Ansys.