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I use Autodesk Inventor 2016 (I'm trying to draw a Wankel engine) I have a (blue) large internal gear that revolves around a stationary (green) small normal gear. It works fine and the teeth mesh. I also created a (red) square block with a hole in it that has the same diameter as the outer diameter of the (blue)internal gear. I used the "insert constraint" to attach the (red) square block to the (blue) internal gear. Now the square block and the internal gear revolve around the small gear. There is only 1 problem : the internal gear rotates within the square block. North, south, west and east of the square block never changes... I would like the square block to turn with the internal gear. The square block should be fixed on the internal gear and move exactly the way the internal gear moves... I tried using "mate constraint" between the internal gear and the square block, but I always get an error message "The assembly cannot be solved" I tried an "angle constraint" between the side of the square block and a side of one of the teeth of the internal gear which also results in an error. I tried nearly everything I could think of. The principle I want to create is that of a Wankel engine. The specs of the internal and small gear are : small gear gear ratio : 1,5 Module : 2,75 Center Distance : 17,5 #teeth : 26 ul internal gear gear ratio : 1,5 Module : 2,75 Center Distance : 17,5 #teeth : 39 ul I used a "mate constraint" between : z-axis of small gear and z-axis of assembly centerpoint of small gear and centerpoint of assembly YZPlane of small gear and YZplane of assembly Is there anyone who has an idea to fix this problem ?

Hi Folks, Got an issue with Planetary (internal) gears and dynamic simulation. basically, i have one sun, one planet and one carrier -internal gear. All are designed to move freely. I can get the DS to work fine, providing I dont contstrain the planar top of the sun to anything. This means when apply force in 3d using my mouse, the sun is free to move up and down the z axis - viewing in 2d and applying force in 2d, the mechanism appears to work as intended only becasue its impossible to apply force to the 3rd axis (z) while viewing from this angle. So the obvious solution is to apply a planar mate for the top of the sun, to another part or plane... right??? That's what I thought, however when i do so to restrict the suns movement on the z axis, and return to Dynamic simulation, the suns rotation locks!. Now the sun doesn't move at all and the planet and solar system just revolve around it. Sheesh - I've racked my brains to figure this one out and i'd really appreciate it if someone here could help. I've attached the assembly file for your reference - PS the assembly attached DOES not have the planar mate constraint applied. Moving to DS and viewing from "front" you will be able to see see the motion as intended when applying force (using your mouse) on the sun - notice how all 3 components rotate? Now try viewing in 3d and applying the same(ish) force - you will notice the sun now moves along the z axis. My question : how on earth do i fix this? 6.7mb file - assembly to use is reversing_mechanism2 http://nasora.com.au/test.zip Thanks.