Side airbag device for vehicle

A vehicular side airbag device having an airbag module that can be attached in a side frame of a seat back of a vehicle seat,

• the airbag module comprising:
• an airbag cushion that is rolled or folded in a prescribed storage form and attached in the side frame;
• and
• an inflator attached to the side frame in a state of being inserted into the airbag cushion;
• the airbag cushion comprising:
• a pre-push chamber which is the first to receive gas from the inflator and expands and deploys;
• and
• a main chamber that receives gas passing through the pre-push chamber and expands and deploys;
• the pre-push chamber comprising:
• a pre-upper chamber extending in a vertical direction along the seat back;
• and
• a pre-lower chamber extending forward from a lower part of the pre-upper chamber along a seat cushion of the vehicle seat;
• the main chamber comprising:
• a main upper chamber provided in an area overlapping the pre-upper chamber as viewed from a side of the vehicle seat;
• a main lower chamber provided below the main upper chamber in an area overlapping the pre-lower chamber;
• and
• a baffle or stitching that partitions the main upper chamber from the main lower chamber and prevents gas from passing therethrough;
• and
• the airbag cushion further comprising:
• a first inner vent for supplying gas from the pre-upper chamber to the main upper chamber;
• and
• a check valve for supplying gas from the pre-lower chamber to the main lower chamber while preventing gas from passing from the main lower chamber to the pre-lower chamber.