Gas generator and method for manufacturing gas generator

Patent metadata

Field	Value
Publication number	US-2021291779-A1
Application number	US-201917262445-A
Country	US
Kind code	A1
Filing date	Jun 13, 2019
Priority date	Jul 24, 2018
Publication date	Sep 23, 2021
Grant date	—

Abstract

A gas generator includes a housing, a combustion chamber accommodating therein a gas generating agent burned by an ignition device, a plurality of gas discharge ports provided to a wall surface that defines the combustion chamber, and communicating an inside and an outside of the combustion chamber, and a plurality of closing members respectively closing the plurality of gas discharge ports. Each of the plurality of closing members includes a covering region covering a corresponding gas discharge port of the plurality of gas discharge ports, and a joining region being joined to the wall surface of the housing, and formed adjacent to and surrounding the covering region. The joining region of each of the plurality of closing members is joined to the wall surface at a width within a range from 1 mm to 5 mm, inclusive, from a peripheral edge of the corresponding gas discharge port, and without interfering with another joining region.

First claim

1 . A gas generator, comprising:
a housing; a combustion chamber accommodating therein a gas generating agent to be burned by an ignition device provided in the housing; a plurality of gas discharge ports provided to a wall surface that defines the combustion chamber, and configured to communicate an inside and an outside of the combustion chamber; and a plurality of closing members configured to respectively close the plurality of gas discharge ports, each of the plurality of closing members including,
a covering region configured to cover a corresponding gas discharge port of the plurality of gas discharge ports and
a joining region configured to be joined to the wall surface and formed adjacent to and surrounding the covering region, and
the joining region of each of the plurality of closing members being joined to the wall surface at a width within a range from 1 mm to 5 mm, inclusive, from a peripheral edge of the corresponding gas discharge port, and without interfering with another joining region.

2 . The gas generator according to claim 1 , wherein
each of the plurality of closing members has an outer shape similar to a shape of each of the plurality of gas discharge ports.

3 . The gas generator according to claim 1 , wherein
each of the plurality of closing members is attached to the wall surface on a side of the combustion chamber.

4 . The gas generator according to claim 1 , wherein
each of the plurality of closing members has a center position that coincides with a center position of the corresponding gas discharge port.

5 . The gas generator according to claim 1 , wherein
each of the plurality of gas discharge ports is disposed in a circumferential direction of the housing, each of the plurality of closing members is joined to the wall surface by the joining region of the closing member and by a connecting member in a state where adjacent closing members of the plurality of closing members are connected and integrated by the connecting member, and the connecting member has a width smaller than a width of each of the plurality of closing members.

6 . The gas generator according to claim 1 , wherein
each of the plurality of closing members is a sealing tape.

7 . A method for manufacturing the gas generator according to claim 1 , comprising:
preparing a sealing member provided with, on a base material including one surface provided with a joining surface that can be joined to the wall surface, the plurality of closing members independently formed correspondingly to each arrangement of the plurality of gas discharge ports provided to the wall surface, each of the plurality of closing members being formed by being coupled to the base material at a strength lower than a strength of the base material; adhering the sealing member to the wall surface with each of the plurality of closing members formed on the sealing member made to respectively correspond to the plurality of gas discharge ports; and closing each of the plurality of gas discharge ports while peeling the base material from the sealing member adhered to the wall surface, leaving each of the plurality of closing members on the wall surface with the joining region of each of the plurality of closing members joined to the wall surface.

8 . The gas generator according to claim 2 , wherein
each of the plurality of closing members is attached to the wall surface on a side of the combustion chamber.

9 . The gas generator according to claim 2 , wherein
each of the plurality of closing members has a center position that coincides with a center position of the corresponding gas discharge port.

10 . The gas generator according to claim 2 , wherein
each of the plurality of gas discharge ports is disposed in a circumferential direction of the housing, each of the plurality of closing members is joined to the wall surface by the joining region of the closing member and by a connecting member in a state where adjacent closing members of the plurality of closing members are connected and integrated by the connecting member, and the connecting member has a width smaller than a width of each of the plurality of closing members.

11 . The gas generator according to claim 4 , wherein
each of the plurality of gas discharge ports is disposed in a circumferential direction of the housing, each of the plurality of closing members is joined to the wall surface by the joining region of the closing member and by a connecting member in a state where adjacent closing members of the plurality of closing members are connected and integrated by the connecting member, and the connecting member has a width smaller than a width of each of the plurality of closing members.

12 . The gas generator according to claim 2 , wherein
each of the plurality of closing members is a sealing tape.

13 . The gas generator according to claim 4 , wherein
each of the plurality of closing members is a sealing tape.

14 . The gas generator according to claim 5 , wherein
each of the plurality of closing members is a sealing tape.

15 . A method for manufacturing the gas generator according to claim 2 , comprising:
preparing a sealing member provided with, on a base material including one surface provided with a joining surface that can be joined to the wall surface, the plurality of closing members independently formed correspondingly to each arrangement of the plurality of gas discharge ports provided to the wall surface, each of the plurality of closing members being formed by being coupled to the base material at a strength lower than a strength of the base material; adhering the sealing member to the wall surface with each of the plurality of closing members formed on the sealing member made to respectively correspond to the plurality of gas discharge ports; and closing each of the plurality of gas discharge ports while peeling the base material from the sealing member adhered to the wall surface, leaving each of the plurality of closing members on the wall surface with the joining region of each of the plurality of closing members joined to the wall surface.

16 . A method for manufacturing the gas generator according to claim 4 , comprising:
preparing a sealing member provided with, on a base material including one surface provided with a joining surface that can be joined to the wall surface, the plurality of closing members independently formed correspondingly to each arrangement of the plurality of gas discharge ports provided to the wall surface, each of the plurality of closing members being formed by being coupled to the base material at a strength lower than a strength of the base material; adhering the sealing member to the wall surface with each of the plurality of closing members formed on the sealing member made to respectively correspond to the plurality of gas discharge ports; and closing each of the plurality of gas discharge ports while peeling the base material from the sealing member adhered to the wall surface, leaving each of the plurality of closing members on the wall surface with the joining region of each of the plurality of closing members joined to the wall surface.

Assignees

• Daicel Corp

Inventors

• Imoto Katsuhiro
• Kobayashi Tomoharu

Classifications

• B60R2021/2648

  comprising a plurality of combustion chambers or sub-chambers · CPC title

• B60R21/2644 Primary

  using only solid reacting substances, e.g. pellets, powder · CPC title

• B60R2021/26076

  characterised by casing · CPC title

• B60R21/261

  with means other than bag structure to diffuse or guide inflation fluid · CPC title

• B60R21/264 Primary

  using instantaneous generation of gas, e.g. pyrotechnic (B60R21/268 takes precedence) · CPC title