Spinning rotor

1. Spinning rotor ( 1 ) for an open end rotor spinning machine comprising a rotor shaft ( 2 ), a rotor cup ( 3 ), which has an opening ( 4 ), an inner chamber ( 5 ), a rotor groove ( 6 ), a conically widening slide wall ( 7 ) extending from the opening ( 4 ) to the rotor groove ( 6 ) and a rotor base ( 9 ) arranged opposing the opening ( 4 ) and designed with a bore ( 8 ), through which the rotor shaft ( 2 ) extends at least partially, wherein the rotor shaft ( 2 ) is connected by means of a connection element ( 10 ) to the rotor cup ( 3 ) and the rotor shaft ( 2 ) and rotor cup ( 3 ) comprise a common rotational axis ( 13 ), characterised in that the rotor shaft ( 2 ) and the rotor cup ( 3 ) have connection means ( 11 , 12 ), which are at least partially surrounded by the connection element ( 10 ) configured as a cast part, forming a positive non-releasable connection of the rotor shaft ( 2 ) to the rotor cup ( 3 ).

2. Spinning rotor according to claim 1 , characterised in that the rotor shaft ( 2 ) has a connection means ( 12 ) configured as profiling.

3. Spinning rotor according to claim 2 , characterised in that the profiling ( 12 ) is arranged on the rotor shaft ( 2 ) at the end and reaches through a bore ( 8 ) in the rotor base ( 9 ) partially into the inner chamber ( 5 ) of the rotor cup ( 3 ).

4. Spinning rotor according to claim 3 , characterised in that the profiling ( 12 ) is designed as an annular groove, as a helical groove or as knurling.

5. Spinning rotor according to claim 1 , characterised in that connection means ( 11 ), which are configured as openings, are arranged on the rotor base ( 9 ) of the rotor cup ( 3 ).

6. Spinning rotor according to claim 1 , characterised in that the connection element ( 10 ) is designed as a one-piece diecasting.

7. Spinning rotor according to claim 6 , characterised in that the diecasting ( 10 ) is formed from a metal, in particular from Al, Zn, Mg, Ag, Cu, Au, Si, Fe, Ti, Ge, Sn or the like or an alloy made of these metals.

8. Spinning rotor according to claim 1 , characterised in that the rotor shaft ( 2 ) and the bore ( 8 ) in the rotor base ( 9 ) are configured in such a way that the rotor shaft ( 2 ) is positioned with clearance in the bore ( 8 ) prior to casting.

9. Spinning rotor according to claim 8 , characterised in that the clearance is less than 3 mm.

10. Spinning rotor according to claim 1 , characterised in that the slide wall ( 7 ) has a wall thickness (d), which is in the range of 0.5 mm≦d≦1.5 mm.

11. Open end rotor spinning machine with a spinning rotor ( 1 ) according to claim 1 .

12. Spinning rotor according to claim 9 , characterised in that the clearance is less than 1 mm.

13. Spinning rotor according to claim 10 , characterised in that the slide wall ( 7 ) has a wall thickness (d) which is in the range of 0.6 mm≦d≦0.8 mm.

14. Spinning rotor ( 1 ) for an open end rotor spinning machine comprising a rotor shaft ( 2 ), a rotor cup ( 3 ), which has an opening ( 4 ), an inner chamber ( 5 ), a rotor groove ( 6 ), a conically widening slide wall ( 7 ) extending from the opening ( 4 ) to the rotor groove ( 6 ) and a rotor base ( 9 ) arranged opposing the opening ( 4 ) and designed with a bore ( 8 ), through which the rotor shaft ( 2 ) extends at least partially, wherein the rotor shaft ( 2 ) is connected by means of a connection element ( 10 ) to the rotor cup ( 3 ) and the rotor shaft ( 2 ) and rotor cup ( 3 ) comprise a common rotational axis ( 13 ), characterised in that the rotor shaft ( 2 ) and the rotor cup ( 3 ) have connection means ( 11 , 12 ), which are at least partially surrounded by the connection element ( 10 ) configured as a cast part, forming a positive connection of the rotor shaft ( 2 ) to the rotor cup ( 3 ), wherein the profiling ( 12 ) is arranged on the rotor shaft ( 2 ) at the end and reaches through a bore ( 8 ) in the rotor base ( 9 ) partially into the inner chamber ( 5 ) of the rotor cup ( 3 ).

15. Spinning rotor according to claim 13 , characterised in that the profiling ( 12 ) is designed as an annular groove, as a helical groove or as knurling.

16. Spinning rotor ( 1 ) for an open end rotor spinning machine comprising a rotor shaft ( 2 ), a rotor cup ( 3 ), which has an opening ( 4 ), an inner chamber ( 5 ), a rotor groove ( 6 ), a conically widening slide wall ( 7 ) extending from the opening ( 4 ) to the rotor groove ( 6 ) and a rotor base ( 9 ) arranged opposing the opening ( 4 ) and designed with a bore ( 8 ), through which the rotor shaft ( 2 ) extends at least partially, wherein the rotor shaft ( 2 ) is connected by means of a connection element ( 10 ) to the rotor cup ( 3 ) and the rotor shaft ( 2 ) and rotor cup ( 3 ) comprise a common rotational axis ( 13 ), characterised in that the rotor shaft ( 2 ) and the rotor cup ( 3 ) have connection means ( 11 , 12 ), which are at least partially surrounded by the connection element ( 10 ) configured as a cast part, forming a positive connection of the rotor shaft ( 2 ) to the rotor cup ( 3 ), wherein the connection element ( 10 ) is designed as a one-piece diecasting formed from a metal, in particular from Al, Zn, Mg, Ag, Cu, Au, Si, Fe, Ti, Ge, Sn or the like or an alloy made of these metals.