An auto-balancing device (4) for rotary units or systems, comprising an annular outer race track (11) disposed in a closed, substantially annular housing arranged substantially concentric with and attached to said rotary unit or system, for rotating with said rotary unit or system, and a number of rolling bodies (8) disposed in said housing and freely moveable along said race track (11) for dynamic and/or static contact therewith during rotation of said rotary system, whereby said outer race track is provided in a separate ring (10) of large diameter having a torus-shaped section forming a groove (11) with a curved concave profile facing the centre of the ring, said ring (10) being inserted in a portion of said housing formed as a seat (11) for a seat-surface of the ring and providing sufficient radial rigidity and axial alignment thereto for ascertaining that the circular form of the ring (10) is maintained in spite of forces acting upon it during operation, said torusshaped groove (11) being concentric with the axis (A) of the rotary system.
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