Airbag cushion and side airbag device having the same

1. An airbag cushion comprising:

a first panel symmetrically connected to a second panel with respect to a central reference line, the first panel being configured to be longer than the second panel by a surplus area,

wherein the first panel comprises a protruding chamber that is configured to expand and protrude toward an occupant by gas flowing into an internal space formed between the first panel and the second panel, and

the protruding chamber is configured so that a partial area of the first panel is folded to form an overlapped folded structure and the folded structure unfolds and expands as the internal space expands by the gas, and the folded structure is formed by folding the surplus area,

wherein the surplus area is provided at an upper surface of the first panel and located to be higher than an upper surface of the second panel, and

wherein, when the airbag is expanded, the airbag cushion is configured to have a structure where an upper part being bent towards a passenger's head, as the protruding chamber on the upper surface expands in a structure that is protruding toward the passenger's head.

2. The airbag cushion of claim 1 , edges of the first panel and the second panel are folded and overlapped along the central reference line and sewn in a state in which the folded structure is formed.

3. The airbag cushion of claim 1 , further comprising a non-expandable area in which the first panel and the second panel are bonded to each other and which is not expanded by the gas, wherein the folded structure is located above the non-expandable area.

4. The airbag cushion of claim 1 , wherein

the first panel is folded along a first folding line and a second folding line perpendicular to the central reference line; and

the first folding line and the second folding line are disposed between a bottom line of the folded structure and an upper line of the folded structure, and a distance between the first folding line and the second folding line is the same as a distance between the first folding line and the bottom line and a distance between the second folding line and the upper line.

5. The airbag cushion of claim 4 , wherein a folding direction along the first folding line and a folding direction along the second folding line are opposite to each other.

6. The airbag cushion of claim 1 , wherein the first panel and the second panel are comprised of a flexible fabric material.

7. A side airbag device comprising:

an inflator configured to generate gas; and

an airbag cushion configured to be inflated by the gas,

wherein the airbag cushion includes a first panel symmetrically connected to a second panel with respect to a central reference line, the first panel being configured to be longer than the second panel by a surplus area,

the first panel comprises a protruding chamber that is configured to expand and protrude toward an occupant by the gas flowing into an internal space formed between the first panel and the second panel, and

the protruding chamber is configured so that a partial area of the first panel is folded to form an overlapped folded structure, and the folded structure unfolds and expands as the internal space expands by the gas, and the folded structure is formed by folding the surplus area,

wherein the surplus area is provided at an upper surface of the first panel and located to be higher than an upper surface of the second panel, and

wherein, when the airbag is expanded, the airbag cushion is configured to have a structure where an upper part being bent towards a passenger's head, as the protruding chamber on the upper surface expands in a structure that is protruding toward the passenger's head.