Multi-chamber curtain airbag

1. A vehicle comprising:

a roof;

a headliner;

a seat having an occupant seating area;

a curtain airbag having an extension and being inflatable from an uninflated position to an inflated position; the curtain airbag being between the roof and the headliner in the uninflated position; the curtain airbag being inflatable downwardly from the headliner to the inflated position; the curtain airbag in the inflated position having a main chamber and the extension extending cross-vehicle from the main chamber and vehicle-forward of the occupant seating area in the inflated position; the curtain airbag includes a second extension extending cross-vehicle from the main chamber in the inflated position, the second extension being vehicle-rearward of the extension; and

a second seat having an occupant seating area and spaced from the seat along the vehicle-longitudinal axis, the curtain airbag having a third extension extending from the main chamber, the third extension being between the seat and the occupant seating area of the second seat in the inflated position, the third extension being vehicle-rearward of the second extension;

the seat including a seatback, the second extension being between the extension and the seatback in the inflated position;

the seatback including a first bolster and a second bolster, the first bolster being inboard of the second bolster with the occupant seating area defined therebetween, and the second extension including an inboard face aligned with the second bolster along the longitudinal axis in the inflated position.

2. The vehicle of claim 1 , wherein the extension is elongated cross-vehicle in the uninflated position.

3. The vehicle of claim 2 , wherein the headliner has a tear seam elongated cross-vehicle, the tear seam being aligned with the extension.

4. The vehicle of claim 2 , further comprising a retractor disposed below the curtain airbag in the uninflated position and a tether extending from the retractor to the curtain airbag.

5. The vehicle of claim 4 , wherein the headliner has a tear seam elongated cross-vehicle, the tear seam being aligned with the extension.

6. The vehicle of claim 1 , wherein the extension extends cross-vehicle from the main chamber beyond the second extension.

7. The vehicle of claim 1 , wherein the seat includes a seat bottom and the seatback includes a top, the second extension extending from the top to the seat bottom in the inflated position.

8. The vehicle of claim 1 , wherein the curtain airbag includes a fourth extension extending from the main chamber adjacent to the occupant seating area of the second seat, the fourth extension being vehicle-rearward of the third extension.

9. The vehicle of claim 1 , further comprising a retractor disposed below the curtain airbag in the inflated position and a tether extending from the retractor to the curtain airbag.

10. The vehicle of claim 9 , wherein the retractor is pyrotechnically actuated.

11. The vehicle of claim 10 , further comprising a vehicle body including a middle pillar, the retractor being fixed to the middle pillar.

12. The vehicle of claim 1 , further comprising a vehicle body including a middle pillar and a tether connected to the middle pillar and the extension.

13. The vehicle of claim 1 , further comprising a vehicle door, the main chamber of the curtain airbag including a first panel facing the vehicle door in the inflated position and a second panel opposite the first panel, the extension extending from the second panel.

14. The vehicle of claim 12 , wherein the middle pillar is vehicle-rearward of the extension and the tether extends from the extension to the middle pillar.

15. The vehicle of claim 6 , wherein the extension extends from the main chamber to the first bolster and the second extension extends from the main chamber to the second bolster.

16. A vehicle comprising:

a roof;

a headliner;

a seat having an occupant seating area;

a curtain airbag having an extension and being inflatable from an uninflated position to an inflated position;

the curtain airbag being between the roof and the headliner in the uninflated position;

the curtain airbag being inflatable downwardly from the headliner to the inflated position;

the curtain airbag in the inflated position having a main chamber and the extension extending cross-vehicle from the main chamber and vehicle-forward of the occupant seating area in the inflated position;

the curtain airbag includes a second extension extending cross-vehicle from the main chamber in the inflated position, the second extension being vehicle-rearward of the extension; and

a second seat having an occupant seating area and spaced from the seat along the vehicle-longitudinal axis, the curtain airbag having a third extension extending from the main chamber, the third extension being between the seat and the occupant seating area of the second seat in the inflated position, the third extension being vehicle-rearward of the second extension;

the seat including a seatback, the second extension being between the extension and the seatback in the inflated position; and

the seatback including a first bolster and a second bolster, the first bolster being inboard of the second bolster with the occupant seating area defined therebetween, the extension extending cross-vehicle from the main chamber beyond the second extension.

17. The vehicle of claim 16 , wherein the extension extends from the main chamber to the first bolster and the second extension extends from the main chamber to the second bolster.

18. The vehicle of claim 16 , wherein the second extension includes an inboard face aligned with the second bolster along the longitudinal axis in the inflated position.

19. The vehicle of claim 16 , wherein the headliner has a tear seam elongated cross-vehicle, the tear seam being aligned with the extension.