Safety belt retractor with a load limiting device and vehicle having the same

1. A safety belt retractor with a load limiting device, wherein:

the load limiting device comprises: a hollow spool ( 1 ) around which a webbing can be wound, a locking disk ( 2 ) having a flange ( 21 ) and a sleeve ( 22 ) fixed thereto, and a torsion bar ( 3 );

the locking disk ( 2 ) can be mounted with the flange ( 21 ) on one end of the spool ( 1 ) and can extend with the sleeve ( 22 ) into a hollow chamber of the spool ( 1 ), and the spool ( 1 ) is rotatable in relation to the locking disk ( 2 );

the torsion bar ( 3 ) can be arranged in the hollow chamber of the spool ( 1 ) and is fixed both on the spool ( 1 ) and on the locking disk ( 2 ) in a rotationally secured manner;

the load limiting device further comprises a load limiting ring ( 5 ) with a thread ( 51 ) on the inner circumference, which load limiting ring ( 5 ) can be rotated around the sleeve ( 22 ) with the rotation of the spool ( 1 ), and the sleeve ( 22 ) is provided on its outer circumference with an engaging section ( 221 ) and with a resistance part comprising a cutting section ( 222 ) for applying a resistance to the load limiting ring ( 5 ), wherein the sleeve ( 22 ) has in the engaging section ( 221 ) a mating thread which matches with the thread ( 51 ) of the load limiting ring ( 5 ) and in the cutting section ( 222 ) has an outer diameter that is larger than the nominal diameter of the thread ( 51 ) of the load limiting ring ( 5 ), and the resistance part is arranged downstream of the engaging section ( 221 ) in the axial displacement direction of the load limiting ring ( 5 ).

2. A safety belt retractor according to claim 1 , wherein the sleeve ( 22 ) has a guiding thread in the cutting section ( 222 ), through which guiding thread the load limiting ring ( 5 ) can be guided.

3. A safety belt retractor according to claim 1 wherein the sleeve ( 22 ) is provided on its outer circumference with a stopping surface ( 224 ), which stopping surface is formed by a step made on the sleeve ( 22 ) and is arranged downstream of the cutting section ( 222 ) in the axial displacement direction of the load limiting ring ( 5 ).

4. A safety belt retractor according to claim 1 , wherein the sleeve ( 22 ) is provided on its outer circumference with a separating section ( 223 ), which separating section is arranged directly downstream of the cutting section ( 222 ) in the axial displacement direction of the load limiting ring ( 5 ), and in that the outer diameter of the sleeve ( 22 ) in the separating section ( 223 ) is no larger than the nominal diameter of the thread ( 51 ) of the load limiting ring ( 5 ).

5. A safety belt retractor according to claim 1 , wherein the sleeve ( 22 ) is provided on its outer circumference with a stopping surface ( 224 ) as a second resistance part, which stopping surface is formed by a step made on the sleeve ( 22 ).

6. A safety belt retractor according to claim 1 , wherein the thread of the load limiting ring ( 5 ) extends in a discontinuous manner in the circumferential direction and thereby forms at least one threaded section, and in that the thread of the load limiting ring ( 5 ) is divided into a plurality of threaded sections in an equally spaced manner in the circumferential direction.

7. A safety belt retractor according to claim 1 , wherein the flange ( 21 ) of the locking disk ( 2 ) and the sleeve ( 22 ) are integrated.

8. A safety belt retractor according to claim 1 , wherein the safety belt retractor further comprises a safety belt tensioner.

9. A vehicle, which comprises a safety belt retractor according to claim 1 .

10. A safety belt retractor with a load limiting device, wherein:

the load limiting device comprises: a hollow spool ( 1 ) around which a webbing can be wound, a locking disk ( 2 ) having a flange ( 21 ) and a sleeve ( 22 ) fixed thereto, and a torsion bar ( 3 );

the locking disk ( 2 ) can be mounted with the flange ( 21 ) on one end of the spool ( 1 ) and can extend with the sleeve ( 22 ) into a hollow chamber of the spool ( 1 ), and the spool ( 1 ) is rotatable in relation to the locking disk ( 2 );

the torsion bar ( 3 ) can be arranged in the hollow chamber of the spool ( 1 ) and is fixed both on the spool ( 1 ) and on the locking disk ( 2 ) in a rotationally secured manner;

the load limiting device further comprises a load limiting ring ( 5 ) with a thread ( 51 ) on the inner circumference, which load limiting ring ( 5 ) can be rotated around the sleeve ( 22 ) with the rotation of the spool ( 1 ), and the sleeve ( 22 ) is provided on its outer circumference with an engaging section ( 221 ) and with a resistance part for applying a resistance to the load limiting ring ( 5 ), wherein the sleeve ( 22 ) has in the engaging section ( 221 ) a mating thread which matches with the thread ( 51 ) of the load limiting ring ( 5 ), and the resistance part is arranged downstream of the engaging section ( 221 ) in the axial displacement direction of the load limiting ring ( 5 ),

wherein a slider extending in the axial direction is provided on the outer circumference of the load limiting ring ( 5 ), and in that a sliding slot extending in the axial direction is provided on the inner side of the spool ( 1 ), so as to mate with the slider, and thereby the load limiting ring ( 5 ) can be displaced in relation to the spool ( 1 ) in the axial direction, while being mounted on the spool ( 1 ) in a rotationally secured manner.

11. A safety belt retractor with a load limiting device, wherein:

the load limiting device comprises: a hollow spool ( 1 ) around which a webbing can be wound, a locking disk ( 2 ) having a flange ( 21 ) and a sleeve ( 22 ) fixed thereto, and a torsion bar ( 3 );

the locking disk ( 2 ) can be mounted with the flange ( 21 ) on one end of the spool ( 1 ) and can extend with the sleeve ( 22 ) into a hollow chamber of the spool ( 1 ), and the spool ( 1 ) is rotatable in relation to the locking disk ( 2 );

the torsion bar ( 3 ) can be arranged in the hollow chamber of the spool ( 1 ) and is fixed both on the spool ( 1 ) and on the locking disk ( 2 ) in a rotationally secured manner;

the load limiting device further comprises a load limiting ring ( 5 ) with a thread ( 51 ) on the inner circumference, which load limiting ring ( 5 ) can be rotated around the sleeve ( 22 ) with the rotation of the spool ( 1 ), and the sleeve ( 22 ) is provided on its outer circumference with an engaging section ( 221 ) and with a resistance part for applying a resistance to the load limiting ring ( 5 ), wherein the sleeve ( 22 ) has in the engaging section ( 221 ) a mating thread which matches with the thread ( 51 ) of the load limiting ring ( 5 ), and the resistance part is arranged downstream of the engaging section ( 221 ) in the axial displacement direction of the load limiting ring ( 5 ),

wherein the load limiting device further comprises a clip ( 4 ) for preventing the spool ( 1 ) from bouncing axially in relation to the locking disk ( 2 ).

12. A safety belt retractor according to claim 10 , wherein the clip ( 4 ) is positioned in the assembled state between the spool ( 1 ) and the locking disk ( 2 ) by means of a mounting hole ( 23 ) in the spool ( 1 ) and a positioning slot on the locking disk ( 2 ).