topic Re: Problem to rotate spur gears in assembly in Inventor Forum

Problem to rotate spur gears in assembly

kopera — Thu, 02 May 2024 16:13:25 GMT

I want to rotate the Disk around axis of GearA (see the attached picture) which will transfer the rotation move to Gear B. The Gear B then should rotate the Gear C.

If I rotate the Disk, the gears B and C does not rotate.

If I rotate the Gear B, it rotates correctly around Gear A, but Gear C does not rote correctly with respect to Gear B.

How to rotate correctly all gears?

Attached is also P&G file (zipped) with all parts.

Re: Problem to rotate spur gears in assembly

Frederick_Law — Thu, 02 May 2024 16:35:02 GMT

Did you use Motion Constrains?

https://help.autodesk.com/view/INVNTOR/2023/ENU/?guid=GUID-493DEAF8-D124-47BE-AFF2-B0535E9005C5

Re: Problem to rotate spur gears in assembly

kopera — Fri, 03 May 2024 09:21:58 GMT

Of course, there are used constrains.

Gear A is fixed - it does not rotate or move.

The Disk has 3 holes. Central hole mates to Z axis of the fixed Gear A, so the Disk can rotate only. The other 2 holes are used for mating to Gear B and Gear C.

Z axix of the Gear B mates to the hole B, and Z axis of the Gear C mates to the hole C. So, the gears B and C can rotate arount Z axis, and also make "planetary movement" around the fixed Gear A (by rotating the Disk).

Gear B has rotation constrain to the fixed Gear A in ratio 0.5.

Gear C has rotation constrain to the Gear B with ratio 1.

The problem:

If I pick the Disk and rotate it, gears B and C does not rotate to each other.

If I pick the Gear B, it rotates correctly around the fixed Gear A, but the Gear C does not rotate.

If I pick the Gear C, it rotates incorrectly with respect to the the Gear B, and also the Gear B rotates incorectly with the Gear A.

I have to rotate the Disk and transfer rotation of the Gear B (which is relative to the fixed Gear A) to the Gear C.

I think it will be more clear if you will download and open the assembly to see how bad it works.

Just one more comment - the Gear C is not in conflict with the fixed Gear A, it is above it.

Re: Problem to rotate spur gears in assembly

JDMather — Fri, 03 May 2024 12:16:33 GMT

@kopera

Environments>Dynamic Simulation - Rolling Cylinder on Cylinder Joints.