Messerschmitt-boelkow-blohm Gesellschaft MIT Beschraenkter Haftung

Messerschmitt-boelkow-blohm Gmbh

Rudolf Woerndle

Klaus Brunsch

Ralf-Thilo Schulz

Wolfgang Buchs

Franz Nowak

A connecting device has at least one bolt and a loop of unidirectional fis bound by or embedded in a synthetic matrix material looping around the bolt to form a looping range extending around the bolt. The resistance of the matrix material in the looping range against squeeze-out is improved by reinforcing fiber layers located in the looping range of the loop around the bolt. The fibers of these reinforcing layers are also bound by the matrix of the synthetic material. The reinforcing fibers form insert and/or cover layers having at least one main fiber orientation which extends at least approximately in the direction of the longitudinal bolt axis whereas the unidirectional fibers forming the loop extend approximately tangentially to the bolt in the looping range.

Connecting device comprising a bolt and a loop around the bolt

A connecting element for securing a rotor blade to the rotor hub of a helicopter rotor comprises at least two components arranged at an angle relative to each other. At least one component extends outside the boundary of the other component on both sides of the other component. Slots are arranged in at least one of the components and these slots extend substantially toward the shearing center or rather toward the central shearing axis. Additionally, each connecting element has a flattened zone adjacent to the rotor hub to function as a flapping hinge. The connecting element also functions as a lead-lag hinge and as a torsion hinge.

Hingeless rotor, especially for a helicopter

A loop type force transmitting element is made of fiber composite or compd material. The force transmitting element has a predetermined cross-sectional shape and is open at one end. The cross-sectional area through the loop is constant along the length of the loop. However, the cross-sectional shape or configuration varies along the length of the loop. This type of structure is accomplished by machine winding the reinforcing fibers or filaments as an endless loop onto a winding core which has lateral walls spaced from each other so that the spacing corresponds to the wall thickness configuration along the length of the force transmitting element. One loop portion of the initially endless loop is severed after the composite material has been hardened whereby a loop element is formed which is open at one end.

Growing community of inventors

Brunnthal, Germany

Rudolf Woerndle