Gas generator

Patent metadata

Field	Value
Publication number	US-10981534-B2
Application number	US-201716343507-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Nov 10, 2016
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

The present invention provides a gas generator including:
a housing having a top plate, a bottom plate located axially opposite to the top plate, and a circumferential wall located between the top plate and the bottom plate and provided with a gas discharge port; a partition wall provided with a single first communication hole, the partition wall being radially disposed in the housing to partition an interior of the housing into a first combustion chamber on the side of the top plate, which accommodates a first gas generating agent, and a second combustion chamber on the side of the bottom plate, which accommodates a second gas generating agent; a cylindrical guide member disposed between the first igniter attached to the bottom surface and the first communication hole, and provided with a second communication hole in a cylindrical wall thereof, the cylindrical guide member being disposed so as to enclose the first igniter, such that a second end opening thereof is connected to the first communication hole of the partition wall, the second end opening or the first communication hole being closed by a first closing member in a state where the second end opening or the first communication hole faces the first combustion chamber, the second communication hole closed by a second closing member in a state where the second communication hole faces the second combustion chamber, and a rupturing pressure of the first closing member being set lower than a rupturing pressure of the second closing member.

First claim

The invention claimed is:

1. A gas generator, comprising:
a housing having a top plate, a bottom plate located axially opposite to the top plate, and a circumferential wall located between the top plate and the bottom plate and provided with a gas discharge port;
a partition wall provided with a first communication hole including a single through hole, the partition wall being radially disposed in the housing to partition an interior of the housing into a first combustion chamber on a side of the top plate, which accommodates a first gas generating agent, and a second combustion chamber on a side of the bottom plate, which accommodates a second gas generating agent;
a first igniter for burning the first gas generating agent and a second igniter for burning the second gas generating agent, the first and second igniters being attached to the bottom plate;
a cylindrical guide member being disposed between the first igniter and the first communication hole of the partition wall and provided with a second communication hole in a cylindrical wall thereof,
the cylindrical guide member being disposed so as to enclose the first igniter, such that a first end opening thereof is located on the side of the bottom plate and a second end opening thereof is connected to the first communication hole of the partition wall,
the second end opening or the first communication hole being closed by a first closing member in a state where the second end opening or the first communication hole faces the first combustion chamber, the second communication hole being closed by a second closing member in a state where the second communication hole faces the second combustion chamber, and a rupturing pressure of the first closing member being set lower than a rupturing pressure of the second closing member.

2. The gas generator according to claim 1 , wherein the second communication hole of the cylindrical guide member is formed only on a surface of the cylindrical wall, opposite to a surface facing the second igniter.

3. The gas generator according to claim 1 , wherein the first closing member and the second closing member are made of a same material and have a same thickness, and
the second communication hole is formed in plurality and a hole diameter of each one of the second communication holes is smaller than a hole diameter of the second end opening.

4. The gas generator according to claim 1 , wherein, when the rupturing pressure of the second closing member is 1, the rupturing pressure of the first closing member is not more than 0.90.

5. The gas generator according to claim 1 , wherein the second end opening of the cylindrical guide member has an annular surface protruding inward, the first closing member is disposed from inside onto the annular surface and closes the second end opening, and
the second closing member is disposed from inside onto the cylindrical wall of the cylindrical guide member and closes the second communication hole.

6. A gas generator, comprising:
a housing having a top plate, a bottom plate located axially opposite to the top plate, and a circumferential wall located between the top plate and the bottom plate and provided with a gas discharge port;
a partition wall provided with a first communication hole including a single through hole, the partition wall being radially disposed in the housing to partition an interior of the housing into a first combustion chamber on a side of the top plate, which accommodates a first gas generating agent, and a second combustion chamber on a side of the bottom plate, which accommodates a second gas generating agent;
a first igniter for burning the first gas generating agent and a second igniter for burning the second gas generating agent, the first and second igniters being attached to the bottom plate;
a cylindrical guide member being disposed between the first igniter and the first communication hole of the partition wall and provided with a second communication hole in a cylindrical wall thereof,
the cylindrical guide member being disposed so as to enclose the first igniter, such that a first end opening thereof is located on the side of the bottom plate and a second end opening thereof enters into the first communication hole and faces an interior of the first combustion chamber,
the second end opening being closed by a first closing member in a state where the second end opening faces the first combustion chamber, the second communication hole being closed by a second closing member in a state where the second communication hole faces the second combustion chamber, and a rupturing pressure of the first closing member being set lower than a rupturing pressure of the second closing member.

7. The gas generator according to claim 6 , wherein the second communication hole of the cylindrical guide member is formed only on a surface of the cylindrical wall, opposite to a surface facing the second igniter.

8. The gas generator according to claim 6 , wherein the first closing member and the second closing member are made of a same material and have a same thickness, and
the second communication hole is formed in plurality and a hole diameter of each one of the second communication holes is smaller than a hole diameter of the second end opening.

9. The gas generator according to claim 6 , wherein, when the rupturing pressure of the second closing member is 1, the rupturing pressure of the first closing member is not more than 0.90.

10. The gas generator according to claim 6 , wherein the second end opening of the cylindrical guide member has an annular surface protruding inward, the first closing member is disposed from inside onto the annular surface and closes the second end opening, and
the second closing member is disposed from inside onto the cylindrical wall of the cylindrical guide member and closes the second communication hole.

Assignees

• Daicel Corp

Inventors

• Kobayashi Tomoharu
• Yabuta Mikio
• Fukui Yuki

Classifications

• B60R2021/2642

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

• B60R2021/26029

  Ignitors · CPC title

• B60R21/263 Primary

  using a variable source, e.g. plural stage or controlled output (hybrid inflators B60R21/272) · CPC title

• B60R21/264 Primary

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

• B60R21/268

  using instantaneous release of stored pressurised gas {(B60R21/26005 takes precedence)} · CPC title