Multi-blade rotor for a windmill-type apparatus

In combination with a windmill-type apparatus of a wind power installation having a multi-blade rotor including a hub supported on shaft means, and rotor blades that are connected to said hub, via bearing means, in such a way that said rotor blades are rotatable about their longitudinal axes, said hub having the improvement therewith comprising:

• rotationally symmetrical hollow bodies, the number of which corresponds to the number of rotor blades journaled on said hub, said hollow bodies each being provided with a shell-type construction and respectively being joined free of any screw bolts and irregularities including holes, notches, grooves, slots, depressions and the like for a smooth surfacing therewith;
• rod-like pressure members on which said hollow bodies are mounted, with the number of said pressure members corresponding to the number of said hollow bodies;
• said pressure members being mounted on said shaft means, via bearing plates, having longitudinal central axes of said pressure members respectively disposed at least nearly at the point of concentration of the bending moment surface of the pertaining hollow body;
• and
• a radially disposed tie rod system that holds said hollow bodies together and includes prestressed tie rods that extend at least nearly in the axes of symmetry of said hollow bodies, with said prestress of said tie rods being located extending in the axes of symmetry of said hollow bodies that are substantially free of any bending load thereon and that are stressed thereby with only compressive forces each of said rotor blades being provided with a base, in the form of a flange, for connection to said hub, as well as thrust bearings and further rod-like members being disposed between, and interconnecting, said tie rod system and said flanges.