Spindle drive, and comfort drive having a spindle drive

1. A spindle drive ( 10 ) comprising

a gear housing ( 15 ) which is connected to a drive motor ( 12 ), the gear housing ( 15 ) having a housing main body ( 16 ; 16 a ) and a housing cover ( 18 ; 18 a , 20 ; 20 a ) which is connected to the housing main body ( 16 ; 16 a ), the housing main body ( 16 ; 16 a ) and the housing cover ( 18 ; 18 a , 20 ; 20 a ) delimiting a receiving space ( 24 ) for a drive element ( 25 ) which interacts with the drive motor ( 12 ), the drive element ( 25 ) being connected to a spindle ( 28 ) which penetrates the receiving space ( 24 ), and

means ( 37 ) for arranging the drive element ( 25 ) in the receiving space ( 24 ) in a manner which is free from axial play, the means ( 37 ) being arranged in a receiving region ( 39 ) in the receiving space ( 24 ),

wherein means for adjusting the size of the receiving region ( 39 ) are configured to, via a threaded connection ( 45 ; 45 a ) with the housing cover ( 18 ), set and adjust the size of the receiving region ( 39 ) along a direction that runs coaxially with respect to a rotational axis ( 32 ) of the spindle ( 28 ).

2. The spindle drive according to claim 1 , characterized in that the threaded connection ( 45 ) comprises an external thread ( 46 ) on the housing cover ( 18 ) and an internal thread ( 43 ) on an inner wall ( 42 ) of the housing main body ( 16 ), wherein a centerline of the threaded connection ( 45 ; 45 a ) is collinear with the rotational axis ( 32 ) of the spindle ( 28 ).

3. The spindle drive according to claim 2 , characterized in that the internal thread ( 43 ) extends over an entire height of the main housing body ( 16 ), wherein the height runs in a direction of the rotational axis ( 32 ) of the spindle ( 28 ), and in that the housing cover ( 18 ) is a first housing cover, and wherein a second housing cover ( 18 ) is provided, wherein the first and second housing covers are arranged on opposite end sides of the housing main body ( 16 ).

4. The spindle drive according to claim 2 , characterized in that the housing main body ( 16 ) and the housing cover ( 18 ) consist of plastic and are configured as an injection molded part.

5. The spindle drive according to claim 2 , characterized in that the housing cover ( 18 ) is of annular configuration with a through opening ( 48 ) for the spindle ( 28 ).

6. The spindle drive according to claim 5 , characterized in that the housing cover ( 18 ) has an axial thrust face for the drive element ( 25 ).

7. The spindle drive according to claim 2 , characterized in that the means ( 37 ) for arranging the drive element ( 25 ) in the receiving space ( 24 ) is an axial spring element which is configured to be pressed axially against the drive element ( 25 ) by the housing cover ( 18 ) and by way of the threaded connection ( 45 ).

8. The spindle drive according to claim 1 , characterized in that the drive element ( 25 ) is a worm gear and consists of plastic.

9. The spindle drive according to claim 1 , wherein the means ( 37 ) for arranging the drive element ( 25 ) in the receiving space ( 24 ) includes a shaft ring.

10. The spindle drive according to claim 1 , characterized in that the drive element ( 25 ) is a worm gear and consists of POM.

11. The spindle drive according to claim 1 , characterized in that the means for adjusting the size of the receiving region ( 39 ) includes an element ( 40 a ), wherein the threaded connection ( 45 a ) comprises an external thread ( 55 ) on the element ( 40 a ) and an internal thread ( 58 ) on the housing cover ( 18 a ), and wherein a centerline of the threaded connection ( 45 a ) is collinear with the rotational axis ( 32 ) of the spindle ( 28 ), and wherein the element ( 40 a ) is of annular configuration with a through opening ( 48 ) for the spindle ( 28 ).

12. The spindle drive according to claim 11 , characterized in that the element ( 40 a ) is a bearing element ( 52 , 54 ).

13. The spindle drive according to claim 12 , characterized in that the bearing element ( 52 , 54 ) is hat-shaped in cross section.

14. The spindle drive according to claim 13 , characterized in that the means ( 37 ) for arranging the drive element ( 25 ) in the receiving space ( 24 ) is an axial spring element compressed between the drive element ( 25 ) and a brim-like portion of the hat-shaped bearing element having a largest radius from the rotational axis ( 32 ) of the spindle ( 28 ).

15. The spindle drive according to claim 12 , characterized in that the bearing element ( 52 , 54 ) is a first bearing element, wherein a second bearing element ( 52 , 54 ) is provided, and wherein the first and second bearing elements are arranged on opposite end sides of the housing main body ( 16 ).

16. The spindle drive according to claim 11 , characterized in that the housing main body ( 16 ) and the element ( 40 a ) consist of plastic and are configured as an injection molded part.

17. The spindle drive according to claim 11 , characterized in that the element ( 40 a ) has an axial thrust face for the drive element ( 25 ).

18. The spindle drive according to claim 11 , characterized in that the means ( 37 ) for arranging the drive element ( 25 ) in the receiving space ( 24 ) is an axial spring element which is configured to be pressed axially against the drive element ( 25 ) by the element ( 40 a ) and by way of the threaded connection ( 45 a ).

19. A comfort drive ( 100 ), having a spindle drive ( 10 ) which is configured according to claim 1 .

20. A seat adjusting drive, having a spindle drive ( 10 ) which is configured according to claim 1 .