[petek]

I think your problem is that the gears are modeled with the wrong helix angle. To correct this, open the gear .ipt file, right-click the Coil in the browser and select Edit Feature. On the Coil Size tab, replace the text in the Revolution field with: d2 / ( 3.142 ul * d0 ) This makes the helix angle = the face width/ pi * gear diameter (shame Inventor doesn't understand "pi").

You can constrain two gears' teeth with a tangent constraint to correctly locate them. I don't know if that constraint will hold up when you rotate the gears or not. (call it an "exercize left for the readers" ... hee hee ...)

I'd attach the corrected gear files, but they're over the limit (534K zipped).