Gas generator

• US 10,457,245 B2
• Filed: 11/16/2016
• Issued: 10/29/2019
• Est. Priority Date: 11/26/2015
• Status: Active Grant

• Current Assignee: Daicel Corporation
• Original Assignee: Daicel Corporation
• Inventors: Fukumoto, Kenji, Kobayashi, Tomoharu
• Primary Examiner(s): Abdosh, Samir
• Application Number:
  US15/771,915
• Publication Number:
  US 20180354451A1
• Time in Patent Office: 1,077 Days
• Field of Search: 102530
• CPC Class Codes: B60R 21/264 using instantaneous generation of gas, e.g. pyrotechnic B60R21/268 takes precedence
• CPC Class Codes: F15B 15/19 Pyrotechnical actuators

Abstract

The present invention provides a gas generator including, in a cylindrical housing, a combustion chamber which is filled with gas generating agents as a gas source, and a gas discharge port for discharging a gas generated by combustion of the gas generating agents,

• • the combustion chamber including,
    • an ignition device which includes an igniter and closes a first end opening of the cylindrical housing, a partition wall which closes a second end opening on the side axially opposite to the first end opening, and a perforated cylindrical body which is disposed in an inner space thereof;
  • the igniter having an igniter main body which includes an ignition portion, and an igniter collar which surrounds and holds the igniter main body;
  • the perforated cylindrical body being disposed such that a first end thereof surrounds the ignition portion of the igniter, and a second end thereof on the axially opposite side being located on the side of the partition wall;
  • an inside space of the perforated cylindrical body being a first chamber which is filled with part of the gas generating agents, and an outside space of the perforated cylindrical body being a second chamber which is filled with the remaining gas generating agents; and
  • the gas discharge port being a through hole which is formed in a portion of the partition wall facing the second chamber.

Claims

1. A gas generator comprising, in a cylindrical housing, a combustion chamber which is filled with gas generating agents as a gas source, and a gas discharge port for discharging a gas generated by combustion of the gas generating agents,

the combustion chamber including,

an ignition device which includes an igniter and closes a first end opening of the cylindrical housing, a partition wall which closes a second end opening of the cylindrical housing on the side axially opposite to the first end opening, and a perforated cylindrical body which is disposed in an inner space of the cylindrical housing,

the igniter having an igniter main body, which includes an ignition portion, and an igniter collar which surrounds and holds the igniter main body;

the perforated cylindrical body being disposed such that a first end thereof surrounds the ignition portion of the igniter, and a second end of the perforated cylindrical body being disposed on the axially opposite side located on the side of the partition wall;

an inside space of the perforated cylindrical body being a first chamber which is filled with part of the gas generating agents, and an outside space of the perforated cylindrical body being a second chamber which is filled with the remaining gas generating agents; and

the gas discharge port being a through hole which is formed in a portion of the partition wall facing the second chamber.

6. The gas generator according to claim 1, wherein the perforated cylindrical body includes a plurality of holes such that an opening area of the holes is increased along the length of the perforated cylinder.

7. The gas generator according to claim 1, wherein a volume (V1) of the first chamber of the combustion chamber and a volume (V2) of the second chamber satisfy a relationship of V2>

V1.

2. A gas generator comprising, in a cylindrical housing, a combustion chamber which is filled with gas generating agents as a gas source, and a gas discharge port for discharging a gas generated by combustion of the gas generating agents,

the combustion chamber including,

an ignition device which includes an igniter and closes a first end opening of the cylindrical housing, a partition wall which closes a second end opening of the cylindrical housing on the side axially opposite to the first end opening, and a perforated cylindrical body which is disposed in an inner space of the cylindrical housing,

the igniter having an igniter main body, which includes an ignition portion, and an igniter collar which surrounds and holds the igniter main body;

the perforated cylindrical body being disposed such that a first end thereof surrounds the ignition portion of the igniter, and a second end of the perforated cylindrical body being disposed on the axially opposite side located on the side of the partition wall;

an inside space of the perforated cylindrical body being a first chamber which is filled with part of the gas generating agents, and an outside space of the perforated cylindrical body being a second chamber which is filled with the remaining gas generating agents; and

the gas discharge port being a through hole which is formed in a portion of the cylindrical housing facing the second chamber on the side of the partition wall.

8. The gas generator according to claim 2, wherein the perforated cylindrical body includes a plurality of holes such that an opening area of the holes is increased along the length of the perforated cylinder.

9. The gas generator according to claim 2, wherein a volume (V1) of the first chamber of the combustion chamber and a volume (V2) of the second chamber satisfy a relationship of V2>

V1.

3. A gas generator comprising, in a cylindrical housing, a combustion chamber which is filled with gas generating agents as a gas source, and a gas discharge port for discharging a gas generated by combustion of the gas generating agents,

the combustion chamber including,

an ignition device which includes an igniter and closes a first end opening of the cylindrical housing, a partition wall which closes a second end opening of the cylindrical housing on the side axially opposite to the first end opening, an inner space which is obtained within the cylindrical housing, and a perforated cylindrical body which is disposed in the inner space;

the igniter having an igniter main body, which includes an ignition portion, and an igniter collar which surrounds and holds the igniter main body;

the perforated cylindrical body being disposed such that a first end thereof surrounds the ignition portion of the igniter, and a second end of the perforated cylindrical body being disposed on the axially opposite side located on the side of the partition wall;

an inside space of the perforated cylindrical body being a first chamber which is filled with part of the gas generating agents, and an outside space of the perforated cylindrical body being a second chamber which is filled with the remaining gas generating agents;

a diffuser portion being arranged at the second end opening of the cylindrical housing, which is closed by the partition wall;

the gas discharge port including a first gas discharge port which is a through hole formed in a portion of the partition wall facing the second chamber and a second gas discharge port which is formed in the diffuser portion; and

a combustion gas generated in a combustion chamber being discharged from the first gas discharge port into the diffuser portion and then discharged from the second gas discharge port.

10. The gas generator according to claim 3, wherein the perforated cylindrical body includes a plurality of holes such that an opening area of the holes is increased along the length of the perforated cylinder.

11. The gas generator according to claim 3, wherein a volume (V1) of the first chamber of the combustion chamber and a volume (V2) of the second chamber satisfy a relationship of V2>

V1.

4. A gas generator comprising a combustion chamber which has a first gas discharge port and is filled with gas generating agents, a diffuser chamber which has a second gas discharge port, and a pressurized gas chamber in the order of description from a first end opening of a cylindrical housing toward a second end opening of the cylindrical housing on the side axially opposite thereto;

a closing member closing between the diffuser chamber and the pressurized gas chamber;

a breaking device being disposed between the combustion chamber and the diffuser chamber, the breaking device having a base plate portion and a breaking portion, and moving toward the second end opening at the time of actuation to break the closing member;

the combustion chamber including,

an ignition device which includes an igniter and closes a first end opening of the cylindrical housing, the base plate of the breaking device closes a side axially opposite to the first end opening, so that an inner space is obtained within the cylindrical housing, and a perforated cylindrical body which is disposed in the inner space;

the igniter having an igniter main body which includes an ignition portion, and an igniter collar which surrounds and holds the igniter main body;

the perforated cylindrical body being disposed such that a first end thereof surrounds the ignition portion of the igniter, and a second end of the perforated cylindrical body is disposed on the axially opposite side located on the side of the partition wall;

an inside space of the perforated cylindrical body being a first chamber which is filled with part of the gas generating agents, and an outside space of the perforated cylindrical body being a second chamber which is filled with the remaining gas generating agents;

the first gas discharge port being opened to transfer a combustion gas from the combustion chamber to the diffuser chamber, and the first gas discharge port being a through hole which is formed in a portion of the base plate facing the second chamber; and

the second gas discharge port being opened to discharge the combustion gas and a pressurized gas to the outside of the cylindrical housing, and the second gas discharge port being a through hole which is formed in a portion of a circumferential wall of the cylindrical housing forming the diffuser chamber.

12. The gas generator according to claim 4, wherein the perforated cylindrical body includes a plurality of holes such that an opening area of the holes is increased along the length of the perforated cylinder.

13. The gas generator according to claim 4, wherein a volume (V1) of the first chamber of the combustion chamber and a volume (V2) of the second chamber satisfy a relationship of V2>

V1.

5. A gas generator comprising, in a cylindrical housing, a combustion chamber which is filled with gas generating agents as a gas source, and a gas discharge port for discharging a gas generated by combustion of the gas generating agents,

the combustion chamber including,

an ignition device which includes an igniter and closes a first end opening of the cylindrical housing, a partition wall which closes a second end opening of the cylindrical housing on the side axially opposite to the first end opening, and a perforated cylindrical body which is disposed in an inner space thereof,

the igniter having an igniter main body which includes an ignition portion, and an igniter collar which surrounds and holds the igniter main body;

the perforated cylindrical body being disposed such that a first end thereof surrounds the ignition portion of the igniter, and a second end of the perforated cylindrical body being disposed on the axially opposite side located on the side of the partition wall;

an inside space of the perforated cylindrical body being a first chamber which is filled with part of the gas generating agents, and an outside space of the perforated cylindrical body being a second chamber which is filled with the remaining gas generating agents; and

the gas discharge port including a through hole which is formed in a portion of the partition wall facing the second chamber, and a through hole which is formed in a portion of the cylindrical housing facing the second chamber on the side of the partition wall.

14. The gas generator according to claim 5, wherein the perforated cylindrical body includes a plurality of holes such that an opening area of the holes is increased along the length of the perforated cylinder.

15. The gas generator according to claim 5, wherein a volume (V1) of the first chamber of the combustion chamber and a volume (V2) of the second chamber satisfy a relationship of V2>

V1.