Wing for an aircraft

1. A wing for an aircraft, comprising

a main wing;

a slat; and

a connection assembly movably connecting the slat to the main wing, such that the slat is movable between a retracted position and at least one extended position, the connection assembly comprising:

a guide rail fixedly mounted to the main wing;

an elongate slat track that extends along a track longitudinal axis between a front end and a rear end, wherein the front end of the slat track is fixedly mounted to the slat;

a first roller unit mounted to the rear end of the slat track and engaging the guide rail; and

a roller bearing comprising a second roller unit that is mounted to the main wing and that engages an engagement surface of the slat track;

wherein the slat track comprises a slot extending through the slat track along the track longitudinal axis,

wherein the second roller unit comprises a first roller element and a second roller element mounted on one common shaft for common rotation, and

wherein the common shaft proceeds through the slot.

2. The wing according to claim 1 , wherein the slat track has a profile comprising an upper flange portion, a lower flange portion, and at least one web portion connecting the upper flange portion and the lower flange portion;

wherein the second roller unit is arranged in a recess between the upper flange portion and the lower flange portion and engages a first engagement surface provided at the upper flange portion and/or a second engagement surface provided at the lower flange portion; and

wherein the recess comprises a first recess formed between the upper and lower flange portions at a first side of the web portion and a second recess formed between the upper and lower flange portions at a second side of the web portion opposite the first side.

3. The wing according to claim 2 , wherein the second roller unit comprises a first roller element and a second roller element,

wherein the first roller element is in the first recess and the second roller element is in the second recess, and

wherein first and second roller elements are arranged coaxially and have a same radius.

4. The wing according to claim 2 , wherein a distance between the upper flange portion and the lower flange portion of the slat track is larger than a diameter of the second roller unit, such that a clearance is provided either between the second roller unit and the first engagement surface at the upper flange portion, or between the second roller unit and the second engagement surface at the lower flange portion,

wherein the clearance is smaller at gated locations along the slat track where the second roller unit is located when the slat is in the retracted position and/or in a fully extended position and/or in a defined partly extended position, and

wherein the clearance is larger in areas between the gated locations.

5. The wing according to claim 1 , wherein the first roller unit comprises a single third roller element.

6. The wing according to claim 1 , wherein the first roller unit comprises a third roller element and a fourth roller element,

wherein third and fourth roller elements are arranged coaxially and have a same radius.

7. The wing according to claim 1 , wherein the slat track comprises a first track part and a second track part that are formed separate from one another,

wherein each of the first and second track parts is formed integrally and extends along the track longitudinal axis from the rear end to the front end, and

wherein the first and second track parts are mounted to one another and rest against one another along a contact plane spanned by the track longitudinal axis and a wing thickness direction.

8. The wing according to claim 7 , wherein the first roller unit comprises a single third roller element mounted to both the first track part and the second track part.

9. The wing according to claim 7 , wherein the first roller unit comprises a third roller element and a fourth roller element,

wherein third and fourth roller elements are arranged coaxially and have a same radius, and

wherein the third roller element is mounted to the first track part and the fourth roller element is mounted to the second track part.

10. The wing according to claim 1 , wherein the roller bearing comprises a third roller unit mounted to the main wing and engaging the slat track.

11. The wing according to claim 1 , wherein the connection assembly is a first connection assembly, wherein the wing comprises a second connection assembly connecting the slat to the main wing in a position spaced apart from the first connection assembly in a wing span direction, and wherein the second connection assembly is formed as the first connection assembly.

12. An aircraft comprising a wing according to claim 1 .

13. A connection assembly for movably connecting a slat to a main wing for an aircraft, the connection assembly comprising:

a guide rail configured to fixedly mount to the main wing;

an elongate slat track that extends along a track longitudinal axis between a front end and a rear end, wherein the front end of the slat track is configured to fixedly mount to the slat;

a first roller unit mounted to the rear end of the slat track and engaging the guide rail; and

a roller bearing comprising a second roller unit configured to mount to the main wing and configured for engaging an engagement surface of the slat track,

wherein the slat track comprises a slot extending through the slat track along the track longitudinal axis,

wherein the second roller unit comprises a first roller element and a second roller element mounted on one common shaft for common rotation, and

wherein the common shaft proceeds through the slot.

14. The connection assembly of claim 13 , wherein the slat track has a profile comprising an upper flange portion, a lower flange portion, and at least one web portion connecting upper and lower flange portions, and

wherein the second roller unit is configured to be in a recess between upper and lower flange portions and to engage a first engagement surface provided at the upper flange portion and/or a second engagement surface provided at the lower flange portion.