Gear Rig Problem

[withoutfit_Zhang]

I want to do some gear linkage animation, and finally want to output it to Unity, so I choose to bind bones to do it. But when I used a driver for the bone, there was a strange problem with the rotation of the bone. It would jump back at frame 46 (the rotation of the gear in blender showed no problem, but the gear would rotate obviously after importing it into unity). Does anyone know the reason?

problem.blend (1.1 MB)

[Zebrahead]

Instead of using the Worlds Z Rotation you could use the Local Y Rotation of the Bone. Should work fine afterwards:

[withoutfit_Zhang]

Thank you Zebr4he4d, you helped me a lot !