The problem you've got here is that Sketchup creates a mesh model and Inventor Creates a solid model. Even if you get the Mesh into Inventor it will appear 'Jagged' - Circles and arcs will look like polygons and faces will be composed of a number of triangles.
Check Out this post for an explanation of the differences:
http://cadsetterout.com/cad-setter-o...-a-3d-package/
You could try exporting to SAT, which Inventor should read.
You could try this download from Sycode:
http://www.sycode.com/products/skp_import_iv/index.htm
(Includes a good graphic that shows what you are going to get)
You would probably be better off re-modelling the part in Inventor.




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