Airbag apparatus and airbag system

An airbag apparatus comprising:

• a first left chamber that is expandable so as to cover an outer surface of a front left pillar which is located on a left side with respect to a vehicle width direction of a vehicle;
• a second left chamber that is expandable on the first left chamber;
• a first right chamber that is expandable so as to cover an outer surface of a front right pillar which is located on a right side with respect to the vehicle width direction of the vehicle;
• a second right chamber that is expandable on the first right chamber;
• and
• a gas supply unit that supplies a gas for expansion selectively to the first left chamber, the second left chamber, the first right chamber, and the second right chamber, wherein
• a length of the second left chamber at a time of expansion in a direction along an extension direction of the front left pillar is smaller than a length of the first left chamber at a time of expansion,
• a length of the second right chamber at a time of expansion in a direction along an extension direction of the front right pillar is smaller than a length of the first right chamber at a time of expansion,
• the first left chamber and the second left chamber comprise a left pillar coverage portion that extends along an extension direction of the front left pillar,
• the first right chamber and the second right chamber comprise a right pillar coverage portion that extends along an extension direction of the front right pillar,
• at least part of the left pillar coverage portion of the second left chamber at a time of expansion is located on a right side with respect to the vehicle width direction relative to the left pillar coverage portion of the first left chamber at a time of expansion, and
• at least part of the right pillar coverage portion of the second right chamber at a time of expansion is located on a left side with respect to the vehicle width direction relative to the right pillar coverage portion of the first right chamber at a time of expansion,
• each of the first left chamber and the first right chamber has a hood coverage portion that covers an outer surface of a rear end portion of a hood included in the vehicle at a time of expansion,
• each of the second left chamber and the second right chamber has a hood coverage portion that covers an outer surface of a rear end portion of a hood included in the vehicle at a time of expansion,
• a connection portion connected to the gas supply unit is provided on each hood coverage portion,
• the gas supply unit comprises:
• a first gas supply portion that injects the gas supplied to any of the first left chamber and the second right chamber;
• a first opening/closing valve that is located between the first gas supply portion and the first left chamber;
• a second opening/closing valve that is located between the first gas supply portion and the second right chamber;
• a second gas supply portion that injects the gas supplied to any of the first right chamber and the second left chamber;
• a third opening/closing valve that is located between the second gas supply portion and the first right chamber;
• and
• a fourth opening/closing valve that is located between the second gas supply portion and the second left chamber,
• the gas supply unit further comprises:
• a first connection portion which connects the first gas supply portion to the second right chamber and on which the second opening/closing valve is provided;
• and
• a second connection portion which connects the second gas supply portion to the second left chamber and on which the fourth opening/closing valve is provided, and
• the gas supply unit further comprises:
• a first connection portion which connects the first gas supply portion to the second right chamber and on which the second opening/closing valve is provided;
• and
• a second connection portion which connects the second gas supply portion to the second left chamber and on which the fourth opening/closing valve is provided.