Vehicle occupant protection device

A vehicle occupant protection device comprising:

• an airbag main body formed as a single integrated bag body configured to cover a head portion of a vehicle occupant, the airbag main body including a forward-inflating portion housed in a headrest or in a seat back of a vehicle seat and configured to inflate and deploy with gas supplied by a gas-generating portion, the forward-inflating portion being configured to inflate on a seat front side of the head portion, the airbag main body including a pair of left and right side-inflating portions connected to the forward-inflating portion and configured to inflate on seat side portions of the head portion;
• a sub-bag portion provided in at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion, the sub-bag portion being configured to inflate and deploy to a seat lower side in response to receiving an inflow of gas from the at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion, the sub-bag portion inflating and deploying in response to an internal pressure inside the airbag main body being equal to or greater than a predetermined value;
• and
• a tear seam sewn in a boundary between the airbag main body and the sub-bag portion, the tear seam being configured to rupture in response to the internal pressure inside the airbag main body being equal to the predetermined value or greater.

A vehicle occupant protection device comprising:

• an airbag main body formed as a single integrated bag body configured to cover a head portion of a vehicle occupant, the airbag main body including a forward-inflating portion housed in a headrest or in a seat back of a vehicle seat and configured to inflate and deploy with gas supplied by a gas-generating portion, the forward-inflating portion being configured to inflate on a seat front side of the head portion, the airbag main body including a pair of left and right side-inflating portions connected to the forward-inflating portion and configured to inflate on seat side portions of the head portion;
• a sub-bag portion provided in at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion, the sub-bag portion being configured to inflate and deploy in response to receiving an inflow of gas from the at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion, the sub-bag portion inflating and deploying in response to an internal pressure inside the airbag main body being equal to or greater than a predetermined value, wherein:
• the sub-bag portion is provided in a lower portion of the at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion such that the sub-bag portion inflates and deploys on a seat lower side, and
• when a height of the head portion of the vehicle occupant, as detected by a vehicle occupant detection sensor, is lower than a predetermined height, a greater quantity of gas is supplied from the gas-generating portion to the airbag main body than a quantity of gas supplied when the height of the head portion is higher than the predetermined height.

A vehicle occupant protection device comprising:

• an airbag main body formed as a single integrated bag body configured to cover a head portion of a vehicle occupant, the airbag main body including a forward-inflating portion housed in a headrest or in a seat back of a vehicle seat and configured to inflate and deploy with gas supplied by a gas-generating portion, the forward-inflating portion being configured to inflate on a seat front side of the head portion, the airbag main body including a pair of left and right side-inflating portions connected to the forward-inflating portion and configured to inflate on seat side portions of the head portion;
• and
• a sub-bag portion provided in at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion, the sub-bag portion being configured to inflate and deploy in response to receiving an inflow of gas from the at least one of the forward-inflating portion, the left side-inflating portion, or the right side-inflating portion in response to an internal pressure inside the airbag main body being equal to or greater than a predetermined value,
• wherein before inflating, the sub-bag portion is not in communication with the forward-inflating portion or the side-inflating portions.