Rendering glass

Can someone help me with this wery anoying problem i get when trying to render glass?.

No matter what i do the final render doesnt look right.

If you look at the picture i have uploaded you can see what i am trying to fix.

Is there a fix or some settings i dont know about so it renders clear and not black?.

Without changing the refraction value that is?.

SolidworksPhotoview 360