Side airbag and side airbag device

1. A side airbag that is to be inflated and deployed to a side of an occupant, the side airbag comprising:

an upper chamber provided at an upper portion;

a lower chamber provided at a lower portion;

a middle chamber between the upper chamber and the lower chamber;

a first partition panel that partitions the upper chamber from the middle chamber;

a second partition panel that partitions the lower chamber from the middle chamber;

a third partition panel that partitions the middle chamber from an inflator installation chamber;

a first opening that is provided in the first partition panel and through which the upper chamber and the middle chamber communicate with each other; and

a second opening that is provided in the second partition panel and through which the lower chamber and the middle chamber communicate with each other,

wherein the first partition panel is joined to the third partition panel,

wherein the second partition panel is joined to the third partition panel,

wherein the first partition panel extends from a front edge to a rear edge of the side airbag, and

wherein a rear portion of the first partition panel is sewn to an upper edge of the third partition panel.

2. The side airbag according to claim 1 ,

wherein the first partition panel extends upward toward a front side.

3. The side airbag according to claim 1 ,

wherein the second partition panel extends downward toward a front side.

4. The side airbag according to claim 1 ,

wherein the second partition panel extends from a front edge to a rear edge of the side airbag, and

wherein a rear portion of the second partition panel is sewn to a lower edge of the third partition panel.

5. The side airbag according to claim 1 , comprising:

the inflator installation chamber that is positioned on a rear side in the middle chamber and communicates with the upper chamber and the lower chamber, respectively.

6. The side airbag according to claim 1 ,

wherein an outer surface of the side airbag is constituted by a main panel, and

wherein the main panel comprises a right main panel positioned on a right side surface of the side airbag and a left main panel positioned on a left side surface of the side airbag.

7. The side airbag according to claim 6 ,

wherein a protruding portion protruding rearward is provided at a middle portion of rear edges of the right main panel and the left main panel in an up-down direction,

wherein a portion between the protruding portion of the right main panel and the protruding portion of the left main panel serves as a loading/unloading opening for an inflator, and

wherein the protruding portions or a vicinity of the protruding portions is folded back to a front side to close the loading/unloading opening.

8. The side airbag according to claim 7 ,

wherein the right main panel and the left main panel are formed of a single continuous main panel in which the right main panel and the left main panel are connected to each other at front portions thereof,

wherein the main panel is folded back along a center line between the right main panel and the left main panel, and

wherein the right main panel and the left main panel are sewn together at an outer peripheral edge of the main panel between the folding line and the loading/unloading opening.

9. The side airbag according to claim 6 ,

wherein the first partition panel comprises a right first partition panel extending along a right side surface of the side airbag and a left first partition panel extending along a left side surface of the side airbag,

wherein a lower edge of the right first partition panel is sewn to the right main panel, and

wherein a lower edge of the left first partition panel is sewn to the left main panel.

10. The side airbag according to claim 9 ,

wherein an upper edge of a rear portion of the right first partition panel is sewn to a right portion of an upper edge of the third partition panel,

wherein an upper edge of a rear portion of the left first partition panel is sewn to a left portion of an upper edge of the third partition panel, and

wherein a front portion of an upper edge of the right first partition panel and a front portion of an upper edge of the left first partition panel are sewn together.

11. The side airbag according to claim 10 ,

wherein the right first partition panel and the left first partition panel are formed of a single panel in which the right first partition panel and the left first partition panel are connected to each other at front portions thereof.

12. The side airbag according to claim 6 ,

wherein the second partition panel comprises a right second partition panel extending along the right side surface of the side airbag and a left second partition panel extending along the left side surface of the side airbag,

wherein an upper edge of the right second partition panel is sewn to the right main panel, and

wherein an upper edge of the left second partition panel is sewn to the left main panel.

13. The side airbag according to claim 12 ,

wherein a lower edge of a rear portion of the right second partition panel is sewn to a right portion of a lower edge of the third partition panel,

wherein a lower edge of a rear portion of the left second partition panel is sewn to a left portion of a lower edge of the third partition panel, and

wherein a front portion of a lower edge of the right second partition panel and a front portion of a lower edge of the left second partition panel are sewn together.

14. The side airbag according to claim 13 ,

wherein the right second partition panel and the left second partition panel are formed of a single panel in which the right second partition panel and the left second partition panel are connected to each other at front portions thereof.

15. The side airbag according to claim 1 ,

wherein the third partition panel comprises a right third partition panel and a left third partition panel,

wherein a front edge of the right third partition panel and a front edge of the left third partition panel are sewn together,

wherein an upper edge of the right third partition panel and an upper edge of the left third partition panel are not sewn together, whereby the inflator installation chamber is open toward the upper chamber, and

wherein a lower edge of the right third partition panel and a lower edge of the left third partition panel are not sewn together, whereby the inflator installation chamber is open toward the lower chamber.

16. The side airbag according to claim 1 ,

wherein the third partition panel is provided with an opening through which the inflator installation chamber and the middle chamber communicate with each other.

17. The side airbag according to claim 1 ,

wherein a vent hole is provided in a front portion of the middle chamber.

18. An airbag device comprising:

the airbag according to claim 1 ; and

an inflator that inflates the airbag.