Airbag apparatus for vehicle

1. An airbag apparatus for a vehicle, the airbag apparatus comprising:

an airbag cushion comprising:

a main panel;

a main portion comprising a first sewn part joined to the main panel and a first chamber part, the main portion configured to cover a side of a passenger when the airbag cushion is expanded by gas injected in the first sewn part; and

an auxiliary portion comprising a second sewn part and a second chamber part, the auxiliary portion configured to cover a front of the passenger when the airbag cushion is expanded by gas injected in the second sewn part; and

a connection member comprising a first end connected to the main portion of the airbag cushion and a second end fixed to the second sewn part of the auxiliary portion, the connection member being configured to guide the airbag cushion to be expanded in a shape surrounding the passenger when the airbag cushion is expanded,

wherein the connection member comprises:

an auxiliary panel extended to cross the second chamber part of the auxiliary portion of the airbag cushion in a vertical direction and fixed to upper and lower ends of the second sewn part of the auxiliary portion of the airbag cushion; and

a connection tether comprising a first end connected to the main portion of the airbag cushion and a second end connected to the auxiliary panel disposed in the auxiliary portion of the airbag cushion.

2. The airbag apparatus of claim 1 , wherein when the airbag cushion is expanded, the main portion is configured to cover the side of the passenger and to be extended in a vertical direction to cover a head and a bottom of the passenger, and the auxiliary portion is configured to extended forward from the main portion to surround an upper torso of the passenger.

3. The airbag apparatus of claim 1 , wherein the airbag cushion comprises a plurality of airbag cushions at opposite sides of a seatback, and auxiliary portions of the plurality of airbag cushions are bent in a facing direction and contact each other when the airbag cushion is expanded.

4. The airbag apparatus of claim 1 , wherein the auxiliary portion of the airbag cushion is extended to be inclined upward from the main portion, and

the connection tether is extended to be inclined downward from the main portion to the auxiliary portion, as a connection point of the first end of the connection tether connected to the main portion is positioned higher than a connection point of the second end of the connection tether connected to the auxiliary panel.

5. The airbag apparatus of claim 1 , wherein the auxiliary panel comprises a guide panel having an opening through which the connection tether passes, and

the first end of the connection tether is connected to the main portion of the airbag cushion, and the second end of the connection tether passes through the guide panel of the auxiliary panel to be connected to an end of the second sewn part of the auxiliary portion.

6. The airbag apparatus of claim 1 , wherein the auxiliary panel is spaced apart from an end of the auxiliary portion of the airbag cushion and is arranged in a center portion of the auxiliary portion.

7. The airbag apparatus of claim 1 , wherein the first chamber part of the main portion has a closed part through which gas is not circulated due to a joint with the main panel, and as the first end of the connection member is connected to the closed part, the connection member is connected to the main portion through the closed part.

8. An airbag apparatus for a vehicle, the airbag apparatus comprising:

an airbag cushion comprising:

a main panel;

a main portion comprising a first sewn part joined to the main panel and a first chamber part, the main portion configured to cover a side of a passenger when the airbag cushion is expanded by gas injected in the first sewn part; and

an auxiliary portion comprising a second sewn part and a second chamber part, the auxiliary portion configured to cover a front of the passenger when the airbag cushion is expanded by gas injected in the second sewn part; and

a connection member comprising a first end connected to the main portion of the airbag cushion and a second end fixed to the second sewn part of the auxiliary portion, the connection member being configured to guide the airbag cushion to be expanded in a shape surrounding the passenger when the airbag cushion is expanded, wherein the airbag cushion comprises a fixing panel extended to cross the first chamber part of the main portion and fixed to the first sewn part of the main portion, and

the connection member is connected to the main portion through the fixing panel by connecting the first end of the connection member to the fixing panel.

9. An airbag apparatus for a vehicle, the airbag apparatus comprising:

an airbag cushion comprising:

a main panel;

a main portion comprising a first sewn part joined to the main panel and a first chamber part, the main portion configured to cover a side of a passenger when the airbag cushion is expanded by gas injected in the first sewn part; and

an auxiliary portion comprising a second sewn part and a second chamber part, the auxiliary portion configured to cover a front of the passenger when the airbag cushion is expanded by gas injected in the second sewn part; and

a connection member comprising a first end connected to the main portion of the airbag cushion and a second end fixed to the second sewn part of the auxiliary portion, the connection member being configured to guide the airbag cushion to be expanded in a shape surrounding the passenger when the airbag cushion is expanded, wherein as the connection member moves from the first end thereof to the second end thereof, a width of the connection member is gradually increased, so that the first end of the connection member is connected to the main portion and the second end of the connection member is connected to an upper end and a lower end of the second sewn part of the auxiliary portion.

10. An airbag apparatus for a vehicle, the airbag apparatus comprising:

an airbag cushion comprising:

a main panel;

a main portion comprising a first sewn part joined to the main panel and a first chamber part, the main portion configured to cover a side of a passenger when the airbag cushion is expanded by gas injected in the first sewn part; and

an auxiliary portion comprising a second sewn part and a second chamber part, the auxiliary portion configured to cover a front of the passenger when the airbag cushion is expanded by gas injected in the second sewn part; and

a connection member comprising a first end connected to the main portion of the airbag cushion and a second end fixed to the second sewn part of the auxiliary portion, the connection member being configured to guide the airbag cushion to be expanded in a shape surrounding the passenger when the airbag cushion is expanded, wherein the connection member comprises a first cross tether comprising a first end connected to an upper end of the first sewn part of the main portion and a second end connected to a lower end of the second sewn part of the auxiliary portion, and a second cross tether comprising a first end connected to a lower end of the first sewn part of the main portion and a second end connected to an upper end of the second sewn part of the auxiliary portion, and the first cross tether and the second cross tether are disposed to cross each other.