Dynamics Animation export\inport

Hey,

I have a little issue with importing animation of dynamic objects from 3ds max. For example: 'Spring' is animated in 3ds max, trying to export animation and a model with FBX export + bake animation option, as result in Unity every model part is animated except dynamic objects like springs and dampers. Please guide me or share a link if such post was already discussed (found nothing usefull with googling). Example animation attached - example_animation.