Airbag for a driver's seat of a vehicle and airbag module, vehicle occupant safety system and vehicle having such an airbag

1 . An airbag for a seat of a vehicle comprising a lateral fabric panel and a main fabric panel the edges of which are sewn up with each other so that an airbag volume is formed,

wherein the lateral fabric panel includes two wing portions each forming a sidewall of the airbag, and a central portion connecting the wing portions,

and wherein the main fabric panel includes an upper portion and a lower portion which are sewn up with the wing portions and are interconnected by a front portion, and in the lower portion at least one flap having an additional fabric strip is provided,

and wherein at least one tether extending across the airbag volume is connected, on the one hand, to the upper portion and, on the other hand, to the at least one flap to form, in a filled state of the airbag, a concavity for bypassing a constraining contour.

2 . The airbag according to claim 1 , wherein the at least one tether is dimensioned so that, when filling the airbag with a gas, a space between the upper portion and the lower portion of the main fabric panel is defined.

3 . The airbag according to claim 1 , wherein the additional fabric strip is connected to the lower portion so that the at least one flap and the-additional fabric strip extend in different planes in a wrinkle-free state.

4 . The airbag according to claim 1 , wherein the at least one flap is delimited by a substantially U-shaped slit in the lower portion of the main fabric panel, slit edges thereof being connected to the additional fabric strip.

5 . The airbag according to claim 1 , wherein the constraining contour is a steering wheel, wherein the concavity is configured so that the airbag in the filled state extends laterally around the steering wheel and over a front face of the steering wheel.

6 . The airbag according to claim 1 , wherein an additional tether extends from the central portion of the lateral fabric panel to the front portion of the main fabric panel, said additional tether delimiting, when the airbag is filled, a space between the central portion of the lateral fabric panel and the front portion of the main fabric panel so that, in the filled state of the airbag, a lateral extension projecting from the front portion is formed.

7 . The airbag according to claim 1 , wherein the airbag comprises a bridging portion that extends, in the filled state of the airbag, out of an instrument panel of the vehicle and over of a steering wheel positioned in front of the instrument panel, the airbag further comprising an effective portion that spans, in the filled state of the airbag, in front of the steering wheel, wherein the airbag at least in the effective portion has a rear concavity which, in the filled state of the airbag, accommodates the steering wheel.

8 . A vehicle occupant safety system comprising the airbag according to claim 1 .

9 . A vehicle comprising vehicle occupant safety system according to claim 8 .

10 . An airbag for a seat of a vehicle comprising a lateral fabric panel, a main fabric panel, and an attachment panel, the edges of which are sewn up with each other so that an airbag volume is formed,

wherein the lateral fabric panel includes two wing portions each forming a sidewall of the airbag, and a central portion connecting the wing portions,

wherein the main fabric panel includes an upper portion and a lower portion interconnected by a front portion,

wherein the attachment panel is connected to the lower portion of the main panel by a contoured connecting seam,

wherein the upper portion, lower portion, and the attachment panel are sewn up with the wing portions,

wherein at least one tether extending across the airbag volume is connected, on the one hand, to the upper portion and, on the other hand, to the attachment panel,

wherein the contoured connecting seam is structured to form a gathering seam configured to gather the lower portion of the main panel to form, in a filled state of the airbag, a concavity for bypassing a constraining contour.

11 . The airbag according to claim 10 , wherein the at least one tether is dimensioned so that, when filling the airbag with a gas, a space between the upper portion and the lower portion of the main fabric panel is defined.

12 . The airbag according to claim 10 , wherein the constraining contour is a steering wheel, wherein the concavity is configured so that the airbag in the filled state extends laterally around the steering wheel and over a front face of the steering wheel.

13 . The airbag according to claim 10 , wherein an additional tether extends from the central portion of the lateral fabric panel to the front portion of the main fabric panel, said additional tether delimiting, in the filled state of the airbag, a space between the central portion of the lateral fabric panel and the front portion of the main fabric panel so that, in the filled state of the airbag, a lateral extension projecting from the front portion is formed.

14 . The airbag according to claim 10 , wherein the airbag comprises a bridging portion that extends, in the filled state of the airbag, out of an instrument panel of the vehicle and over a steering wheel positioned in front of the instrument panel, the airbag further comprising an effective portion that spans, in the filled state of the airbag, in front of the steering wheel, wherein the airbag at least in the effective portion has a rear concavity which, in the filled state of the airbag, accommodates the steering wheel.