Hydrodynamic machine, especially hydrodynamic retarder

A hydrodynamic machine comprising:

• a first blade wheel and a second blade wheel positioned opposite of one another and jointly forming a toroidal working chamber fillable with a working medium to hydrodynamically transfer torque using a cycle flow of the working medium in the working chamber from the first blade wheel to the second blade wheel;
• wherein the first blade wheel rotates about a rotation axis in a first direction;
• wherein the second blade wheel is stationary or rotates about the rotation axis in the first direction or opposite of the first direction;
• wherein at least one of the first blade wheel and the second blade wheel is subdivided in a blade region into one or more of at least two concentric rings and ring segments configured to be twisted with respect to one another in a circumferential direction of the at least one of the first blade wheel and the second blade wheel to interrupt one or more blades of the at least one of the first blade wheel and the second blade wheel in surface progression (a) in a first state by an offset as a result of relative twisting of the one or more of at least two concentric rings and ring segments with respect to one another, or (b) in a second state by aligning the one or more of at least two concentric rings and ring segments into a common continuous surface;
• wherein at least the one or more blades of the at least one of the first blade wheel and the second blade wheel have an arc shape.