Belt retractor for a safety belt device

1. A belt retractor ( 10 ) for a safety belt device having a belt reel ( 20 ) for winding and unwinding the safety belt, a pretensioner drive ( 40 ) and a pyrotechnic tensioner drive ( 30 ), wherein the pretensioner drive ( 40 ) has a force flow control element ( 100 ) which in a deactivation position interrupts the force flow between the pretensioner drive ( 40 ) and belt reel ( 20 ), wherein

the pyrotechnic tensioner drive ( 30 ) has one or more drive elements ( 33 ) which after activation of the pyrotechnic tensioner drive ( 30 ) are caused to move and,

the pyrotechnic tensioner drive ( 30 ) is a ball tensioner having a large number of drive balls which each form a drive element ( 33 ),

after an activation of the pyrotechnic tensioner drive ( 30 ), the force flow control element ( 100 ) is directly or indirectly moved into the deactivation position by the drive element ( 33 ) or by at least one of the drive elements ( 33 ) of the pyrotechnic tensioner drive ( 30 ), and

the force flow control element ( 100 ) is moved into the deactivation position by at least one of the drive balls.

2. The belt retractor ( 10 ) as claimed in claim 1 , wherein

the drive element ( 33 ) acts indirectly via at least one intermediate element on the force flow control element ( 100 ) and

the force flow control element ( 100 ) is moved into the deactivation position as a result of the action of the drive element ( 33 ) on the at least one intermediate element and the resultant action of the at least one intermediate element on the force flow control element ( 100 ).

3. The belt retractor ( 10 ) as claimed in claim 1 , wherein the force flow control element ( 100 ) is a pivotable detent which in a first pivot position assumes an activation position, in which it enables a force flow between the pretensioner drive ( 40 ) and the belt reel ( 20 ) and, in a second pivot position, assumes the deactivation position.

4. The belt retractor ( 10 ) as claimed in claim 3 , wherein the drive element ( 33 ) acts directly on the pivotable detent and the pivotable detent is moved into the deactivation position as a result of the direct action of the drive element ( 33 ).

5. The belt retractor ( 10 ) as claimed in claim 3 , wherein

the drive element ( 33 ) acts indirectly via at least one intermediate element on the pivotable detent and

the pivotable detent is moved into the deactivation position as a result of the action of the drive element ( 33 ) on the at least one intermediate element and the action of the at least one intermediate element on the pivotable detent.

6. The belt retractor ( 10 ) as claimed in claim 3 , wherein

there is arranged between the drive element ( 33 ) and the force flow control element ( 100 ) as an intermediate element a rotation element ( 200 ) which is rotated when the drive element ( 33 ) is moved past, and

the pivotable detent is moved by the rotation of the rotation element ( 200 ) into the deactivation position.

7. The belt retractor ( 10 ) as claimed in claim 6 , wherein

the rotation element ( 200 ) has a stop portion ( 210 ) on which the drive element ( 33 )—when it is moved in the pushing direction (S) thereof—acts on the rotation element ( 200 ) and pivots it, and

the rotation element ( 200 ) has an edge portion ( 220 ), in particular a deformable edge portion ( 220 ), which is located before the pyrotechnic tensioner drive ( 30 ) is actuated—when viewed in the pushing direction (S) of the drive element ( 33 )—downstream of the stop portion ( 210 ).

8. The belt retractor ( 10 ) as claimed in claim 7 , wherein

a slot ( 230 ) is arranged between the rotation axis (D) of the rotation element ( 200 ) and the deformable edge portion ( 220 ) of the rotation element ( 200 ), and

the deformability of the deformable edge portion ( 220 ) is based on or at least also based on the fact that the deformable edge portion ( 220 ) can be pressed in the direction of the slot ( 230 ) in the event of external action of force with the slot width being reduced.

9. The belt retractor ( 10 ) as claimed in claim 8 , wherein, when the drive element ( 33 ) strikes the rotation element ( 200 ), the edge portion ( 220 ) is pressed on a boundary portion ( 400 ) of the belt retractor ( 10 ).

10. The belt roller ( 10 ) as claimed in claim 6 , wherein

the edge portion ( 220 ) in the initial state before activation of the pyrotechnic tensioner drive ( 30 ) is opposite a boundary portion ( 400 ) of the belt retractor ( 10 ) or is in abutment therewith, and

a rotary bearing ( 300 ) which supports the rotation element ( 200 ) has a bearing play which enables an at least slight radial movement of the rotary bearing ( 300 ) when striking the drive element ( 33 ).

11. The belt retractor ( 10 ) as claimed in claim 10 , characterized in that wherein,

when the drive element ( 33 ) strikes the rotation element ( 200 ), the rotation element ( 200 ) is moved radially as a result of the bearing play and,

as a result of the radial movement, the rotation element ( 200 ) is pressed against the boundary portion ( 400 ) of the belt retractor ( 10 ), whereby the edge portion ( 220 ) of the rotation element ( 200 ) and/or the boundary portion ( 400 ) is deformed.

12. The belt retractor ( 10 ) as claimed in claim 1 , wherein the force flow control element ( 100 ) and/or an intermediate rotation element ( 200 ) when viewed in the pushing direction (S) of the drive elements is arranged downstream of a drive wheel ( 34 ).

13. A belt retractor ( 10 ) for a safety belt device having a belt reel ( 20 ) for winding and unwinding the safety belt, a pretensioner drive ( 40 ) and a pyrotechnic tensioner drive ( 30 ), wherein the pretensioner drive ( 40 ) has a force flow control element ( 100 ) which in a deactivation position interrupts the force flow between the pretensioner drive ( 40 ) and belt reel ( 20 ), wherein

the pyrotechnic tensioner drive ( 30 ) has one or more drive elements ( 33 ) which after activation of the pyrotechnic tensioner drive ( 30 ) are caused to move and,

after an activation of the pyrotechnic tensioner drive ( 30 ), the force flow control element ( 100 ) is directly or indirectly moved into the deactivation position by the drive element ( 33 ) or by at least one of the drive elements ( 33 ) of the pyrotechnic tensioner drive ( 30 ), and

wherein the drive element ( 33 ) acts directly on the force flow control element ( 100 ) and the force flow control element ( 100 ) is moved into the deactivation position as a result of the direct action of the drive element ( 33 ).