Bushing for a wind turbine rotor blade, flange insert, wind turbine rotor blade and wind turbine

1. A bushing ( 116 ) for a wind turbine rotor blade ( 104 ), the bushing ( 116 ) comprising:

a first bushing end ( 117 ) and an opposite second bushing end ( 118 ); and

a bushing bore ( 119 ) which extends in a region between the first bushing end ( 117 ) and the second bushing end ( 118 ) and comprises a bore longitudinal axis ( 120 );

wherein, along the bore longitudinal axis ( 120 ) in the direction of the second bushing end ( 118 ),

the bushing bore ( 119 ) comprises a threaded portion ( 127 ), and

the bushing ( 116 ) comprises a bushing runout ( 128 ) that follows the threaded portion ( 127 ), said bushing runout comprising a widening portion ( 131 ) of the bushing bore ( 119 ), wherein the widening portion ( 131 ) forms at least 50% of the bushing runout ( 128 ), and wherein in the widening portion ( 131 ) a diameter ( 132 ) of the bushing bore ( 119 ) enlarges monotonically while an increase in diameter decreases monotonically in such a manner that the bushing runout ( 128 ) comprises an arc-shaped course along the entire length of the widening portion ( 131 ).

2. The bushing ( 116 ) according to claim 1 , wherein the bushing ( 116 ) comprises, in the region of the widening portion ( 131 ), a constant outside diameter ( 121 ).

3. The bushing ( 116 ) according to claim 1 , wherein the diameter ( 132 ) in the widening portion ( 131 ) enlarges in such a manner that a wall thickness ( 124 ) of the bushing ( 116 ) decreases constantly on a percentage basis along the widening portion ( 131 ) in the direction of the second bushing end ( 118 ).

4. The bushing ( 116 ) according to claim 1 , wherein the diameter ( 132 ) in the widening portion ( 131 ) enlarges in such a manner that a cross-sectional area of the bushing ( 116 ) decreases constantly on a percentage basis along the widening portion ( 131 ) in the direction of the second bushing end ( 118 ).

5. The bushing ( 116 ) according to claim 1 , wherein the widening portion ( 131 ) forms one of at least 60%, at least 70%, at least 80%, or at least 90%, of the bushing runout ( 128 ).

6. The bushing ( 116 ) according to claim 1 , wherein a wall thickness ( 124 ) of the bushing ( 116 ) increases at least partially between the first bushing end ( 117 ) and the threaded portion ( 127 ).

7. The bushing ( 116 ) according to claim 1 , wherein a circumferential chamfer ( 137 ) or a circumferential radius is configured on the second bushing end ( 118 ).

8. The bushing ( 116 ) according to claim 1 , wherein the bushing ( 116 ) is produced in one piece.

9. The bushing ( 116 ) according to claim 1 , wherein the bushing bore ( 119 ) extends continuously from the first bushing end ( 117 ) to the second bushing end ( 118 ).

10. A flange insert for a wind turbine rotor blade ( 104 ), comprising multiple bushings ( 116 ) arranged next to one another according to claim 1 , wherein the bushings ( 116 ) are embedded in one or more laminate layers.

11. A wind turbine rotor blade ( 104 ), comprising a rotor blade attachment ( 112 ) having multiple bushings ( 116 ) arranged in a circle according to claim 1 .

12. A wind turbine rotor blade ( 104 ), comprising a rotor blade segment having a connecting flange comprising multiple bushings ( 116 ) arranged next to one another according to claim 1 .

13. A wind turbine ( 100 ), comprising a rotor ( 103 ) having one or more rotor blades ( 104 ) according to claim 1 .

14. The bushing ( 116 ) according to claim 1 , wherein the bushing ( 116 ) comprises, in the region of the bushing runout ( 128 ), a constant outside diameter ( 121 ).