Engine or driven machine

An engine or driven machine, comprising:

• a structure;
• a stator device fixed at the structure;
• a rotor device including an outer circumference;
• and
• a rotor shaft coupled or couplable to the rotor device for torque transmission and supported rotatable about an axis of rotation and substantially axially fixed in or on the structure,
• wherein the rotor device is axially supported proximal to its outer circumference in an axis-parallel direction by an aerostatic bearing including a stator-side bearing surface formed on the stator device and a rotor-side bearing surface formed on the rotor device and a bearing gap formed between the stator side bearing surface and the rotor side bearing surface,
• wherein the rotor device is formed by an impeller of a turbine, which includes a multiplicity of turbine blades which extend in the radial direction and are mounted to or supported on a hub rotatably coupled to the rotor shaft,
• wherein radially outer end sections of the turbine blades are connected or coupled to a bearing ring including the rotor-side bearing surface, or
• wherein radially outer end sections of the turbine blades are provided with at least one bearing surface portion including the rotor-side bearing surface,
• wherein the rotor device includes a first rotor-side bearing surface on a first axial side of the rotor device and a second rotor-side bearing surface on a second axial side of the rotor device facing away from the first axial side,
• wherein the first stator-side bearing surface is arranged opposite the rotor-side bearing surface,
• wherein a first bearing gap is formed between the rotor-side bearing surface and the stator-side bearing surface,
• wherein the second stator-side bearing surface is arranged opposite the second rotor-side bearing surface,
• wherein a second bearing gap is formed between the second rotor-side bearing surface and the second stator-side bearing surface, and
• wherein the first stator-side bearing surface or the second stator-side bearing surface is movable in the direction parallel to the axis of rotation or includes bearing elements which are movable in the direction parallel to the axis of rotation.