Torque and centrifugal loads

Hi,

I want to simulate an air plug which makes the distribution in a motor.

This plug is in the cylinder head and two bearings at each end hold it in place.

Thanks to a chain on a sprocket at one end, the part rotates at 4000 rpm. So I add a centrifugal load on the whole part.

The chain does not rotate everytimes at the same speed and due to the inertia of the part, the chain creates a torque at one end of the part.

I put two pin constraints and two planar constraints at each end to simulate the bearing and I add the torque on the right end (460 Nm).

But I need to block the last degree of freedom (the rotation on the central axle of the part) otherwise I can not do a simulation...

I don't know what to block because in the reality the part is not blocked...

Can you please help me ?

Thanks,

Jordan