Curtain airbag, curtain airbag apparatus, and method for manufacturing curtain airbag apparatus
A curtain airbag is folded and stored in an upper portion of a vehicle body under normal circumstances, and is inflated and expanded along a side window in emergency situations. The curtain airbag includes a front chamber to be inflated and expanded along the side window of a front seat of the vehicle body; a first gas supply port to supply gas to the front chamber, the first gas supply port being disposed at an upper portion of the front chamber; a sub-chamber smaller than the front chamber and disposed above the front chamber; and a second gas supply port disposed rearward of the sub-chamber, and communicated with and narrower than the first gas supply port. The sub-chamber is stored in a state of being folded on a front surface of the front chamber on a vehicle interior side at a portion of the second gas supply port.
1. A curtain airbag that is folded and stored in an upper portion of a vehicle body under normal circumstances, and that is inflated and expanded along a side window in emergency situations, the curtain airbag comprising:
a front chamber configured to be inflated and expanded along the side window of a front seat of the vehicle body;
a first gas supply port configured to supply gas to the front chamber, the first gas supply port being disposed at an upper portion of the front chamber;
a sub-chamber that is smaller than the front chamber and that is disposed above the front chamber; and
a second gas supply port that is disposed rearward of the sub-chamber, said second gas supply port communicating with the first gas supply port, and being narrower than the first gas supply port,
wherein the sub-chamber is stored in a state of being folded on a front surface of the front chamber on a side facing an interior of the vehicle body at a portion of the second gas supply port,
a boundary line partitioning the front chamber and the sub-chamber is disposed along a pillar of the vehicle body, and
the curtain airbag further comprises:
a connecting member including a first end portion connected to the vehicle body, and a second end portion connected to a portion adjacent to the second gas supply port on the boundary line.
2. The curtain airbag according to claim 1 , wherein the first end portion is connected rearward of a rear end portion of a garnish disposed on the A pillar.
3. The curtain airbag according to claim 1 , further comprising:
a tether including a first end portion connected to a front of the sub-chamber, and a second end portion connected to a front of the front chamber,
wherein a length of the tether is shorter than a linear distance between a connection point of the first end portion and a connection point of the second end portion.
4. The curtain airbag according to claim 1 , further comprising:
a non-inflatable portion disposed on a boundary line partitioning the front chamber and the sub-chamber.
5. The curtain airbag according to claim 4 , wherein the non-inflatable portion includes a slit formed along the boundary line.
6. A curtain airbag apparatus comprising:
the curtain airbag according to claim 1 ; and
an inflator configured to supply gas to the curtain airbag.
7. A method for manufacturing a curtain airbag apparatus including a curtain airbag that is folded and stored in an upper portion of a vehicle body under normal circumstances, and that is inflated and expanded along a side window in emergency situations, and an inflator configured to supply gas to the curtain airbag,
the curtain airbag including
a front chamber configured to be inflated and expanded along the side window of a front seat of the vehicle body;
a first gas supply port configured to supply the gas to the front chamber, the first gas supply port being disposed at an upper portion of the front chamber;
a sub-chamber that is smaller than the front chamber and that is disposed above the front chamber; and
a second gas supply port that is disposed rearward of the sub-chamber, said second gas supply port communicating with the first gas supply port, and being narrower than the first gas supply port,
the method comprising:
folding the sub-chamber on a front surface of the front chamber on a side facing an interior of the vehicle body at a portion of the second gas supply port; and
folding a folded body obtained by the sub-chamber folding step, into a state where the folded body can be stored in the upper portion of the vehicle body,
wherein the curtain airbag includes a tether including a first end portion connected to a front of the sub-chamber, and a second end portion connected to a front of the front chamber,
the method further comprises sewing the first end portion of the tether to the sub-chamber before the sub-chamber folding step, and sewing the second end portion of the tether to the front chamber after the sub-chamber folding step.
8. A curtain airbag that is folded and stored in an upper portion of a vehicle body under normal circumstances, and that is inflated and expanded along a side window in emergency situations, the curtain airbag comprising:
a front chamber configured to be inflated and expanded along the side window of a front seat of the vehicle body;
a first gas supply port configured to supply gas to the front chamber, the first gas supply port being disposed at an upper portion of the front chamber;
a sub-chamber that is smaller than the front chamber and that is disposed above the front chamber;
a second gas supply port that is disposed rearward of the sub-chamber, said second gas supply port communicating with the first gas supply port, and being narrower than the first gas supply port, and
a non-inflatable portion disposed on a boundary line partitioning the front chamber and the sub-chamber,
wherein the sub-chamber is stored in a state of being folded on a front surface of the front chamber on a side facing an interior of the vehicle body at a portion of the second gas supply port, said sub-chamber being folded before the front chamber is folded.