# US 12,759,498 B2 · Gas generator and method for producing gas generator

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- Number: US 12,759,498 B2
- Document ID: US12759498B2
- Status: Granted
- Kind: B2
- Application number: 19/002,769
- Filed: 2024-12-27
- Published: 2025-05-08
- Granted: 2026-10-13
- Earliest claimed: 2022-06-28
- Assignees: Daicel Corporation
- Applicants: Daicel Corporation
- Inventors: Kenichi Yonezawa; Naoki Matsuda; Toshihiro Izuma
- Web page: https://patentgrep.com/patent/US12759498B2

## CPC

- B60R 21/2644: {using only solid reacting substances, e.g. pellets, powder}
- B60R 2021/26011: {using a filter through which the inflation gas passes}
- B60R 2021/2648: {comprising a plurality of combustion chambers or sub-chambers}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A gas generator includes a plurality of gas discharge ports with a first gas discharge port and a second gas discharge port, the first gas discharge port and the second gas discharge port being configured such that rupturing pressures of a closing member at the first gas discharge port and the second gas discharge port are different from each other, a minimum flow path cross-sectional area of a gas flow path formed by the first gas discharge port is equivalent to a minimum flow path cross-sectional area of a gas flow path formed by the second gas discharge port, and the first gas discharge port and the second gas discharge port are different from each other in at least one of a shape or a peripheral length of an opening on an inner surface side of a housing.

## Claims

### Claim 1

A gas generator comprising:
an igniter;
a gas generating agent that generates a combustion gas by being combusted in response to actuation of the igniter;
a housing accommodating the igniter and the gas generating agent inside the housing;
a plurality of gas discharge ports penetrating through the housing from an inside to an outside of the housing; and
a closing structure attached to an inner surface of the housing, the closing structure being configured to close, before the actuation of the igniter, the plurality of gas discharge ports by covering an opening of each of the plurality of gas discharge ports on an inner surface side of the housing and open the plurality of gas discharge ports by being ruptured due to reception of a pressure of the combustion gas generated by the actuation of the igniter, wherein
the plurality of gas discharge ports include at least one first gas discharge port and at least one second gas discharge port, the at least one first gas discharge port and the at least one second gas discharge port being configured such that rupturing pressures of the closing structure at the at least one first gas discharge port and the at least one second gas discharge port are different from each other,
a minimum flow path cross-sectional area of a gas flow path formed by the at least one first gas discharge port is equivalent to a minimum flow path cross-sectional area of a gas flow path formed by the at least one second gas discharge port, and
the at least one first gas discharge port and the at least one second gas discharge port are different from each other in at least one of a shape or a peripheral length of the opening on the inner surface side of the housing.

### Claim 2 (depends on 1)

The gas generator according to claim 1, wherein the closing structure comprises a plurality of closing structures, and
the at least one first gas discharge port and the at least one second gas discharge port are closed with the closing structures having specifications identical to each other.

### Claim 3 (depends on 1)

The gas generator according to claim 1, wherein
each of the at least one first gas discharge port and the at least one second gas discharge port is a port having a circular cross section, and
the at least one first gas discharge port and the at least one second gas discharge port are different from each other in a port diameter of the opening on the inner surface side of the housing.

### Claim 4 (depends on 1)

The gas generator according to claim 1, wherein
each of the at least one first gas discharge port and the at least one second gas discharge port includes:
a straight portion having a constant cross section in a thickness direction of the housing, and
a tapered portion continuous with the straight portion and having a cross-sectional area increasing with distance from the straight portion in the thickness direction,
in one of the at least one first gas discharge port and the at least one second gas discharge port, the tapered portion opens on the inner surface side of the housing and the straight portion opens on an outer surface side of the housing, and
in the other of the at least one first gas discharge port and the at least one second gas discharge port, the straight portion opens on the inner surface side of the housing, and the tapered portion opens on the outer surface side of the housing.

### Claim 5 (depends on 4)

The gas generator according to claim 4, wherein
the straight portion is constituted by a shear surface, and
the tapered portion is constituted by a fracture surface.

### Claim 6 (depends on 4)

The gas generator according to claim 4, wherein
a relationship of 0.3<t2/t1<0.7 is satisfied,
where a thickness of the housing is denoted by t1, and a length of the straight portion in the thickness direction of the housing is denoted by t2.

### Claim 7 (depends on 1)

The gas generator according to claim 1, wherein
a protruding portion protruding toward the inner surface side of the housing is formed at at least a part of a peripheral edge of the opening on the inner surface side of the housing of only one of the at least one first gas discharge port and the at least one second gas discharge port, and
the closing structure is attached to the inner surface of the housing while covering the protruding portion.

### Claim 8 (depends on 1)

The gas generator according to claim 1, wherein
a peripheral edge of the opening on the inner surface side of the housing of only one of the at least one first gas discharge port and the at least one second gas discharge port is chamfered.

### Claim 9

A method for producing a gas generator,
the gas generator including:
an igniter,
a gas generating agent that generates a combustion gas by being combusted in response to actuation of the igniter,
a housing accommodating the igniter and the gas generating agent inside the housing,
a plurality of gas discharge ports penetrating through the housing from an inside to an outside of the housing, and
a closing structure to close the plurality of gas discharge ports, the method comprising:
forming the plurality of gas discharge ports including at least one first gas discharge port and at least one second gas discharge port in the housing in such a manner that rupturing pressures of the closing structure at the at least one first gas discharge port and the at least one second gas discharge port are different from each other; and
attaching the closing structure to an inner surface of the housing in such a manner that the closing structure covers an opening of each of the plurality of gas discharge ports on an inner surface side of the housing, wherein
in the forming of the plurality of gas discharge ports in the housing, a minimum flow path cross-sectional area of a gas flow path formed by the at least one first gas discharge port and a minimum flow path cross-sectional area of a gas flow path formed by the at least one second gas discharge port are equivalent to each other, and the at least one first gas discharge port and the at least one second gas discharge port are different from each other in at least one of a shape or a peripheral length of the opening on the inner surface side of the housing.

### Claim 10 (depends on 9)

The method for producing a gas generator according to claim 9, wherein
in the forming of the plurality of gas discharge ports in the housing,
one of the at least one first gas discharge port and the at least one second gas discharge port is formed by punching a hole from an outer surface side of the housing, and
the other of the at least one first gas discharge port and the at least one second gas discharge port is formed by punching a hole from the inner surface side of the housing.

### Claim 11 (depends on 9)

The method for producing a gas generator according to claim 9, wherein
in the forming of the plurality of gas discharge ports in the housing,
chamfering is performed on the opening on the inner surface side of the housing of only one of the at least one first gas discharge port and the at least one second gas discharge port.

### Claim 12 (depends on 9)

The method for producing a gas generator according to claim 9, wherein
in the attaching of the closing structure to the inner surface of the housing, the closing structure comprises a plurality of closing structures, and
the at least one first gas discharge port and the at least one second gas discharge port are closed with the closing structures having specifications identical to each other.

### Claim 13

A gas generator, comprising:
a housing accommodating a igniter and a gas generating agent inside thereof;
a first gas discharge port penetrating through the housing from an inside to an outside of the housing, and being closed, from the inside of the housing, by a first closing structure provided with a first rupturable pressure, the first gas discharge port including a first minimum flow path cross-sectional area;
a second gas discharge port penetrating through the housing from the inside to the outside of the housing, and being closed, from the inside of the housing, by a second closing structure provided with a second rupturable pressure different from the first rupturable pressure, the second gas discharge port including a second minimum flow path cross-sectional area equivalent to the first minimum flow path cross-sectional area,
the first gas discharge port and the second gas discharge port being different from each other in at least one of a shape or a peripheral length of an opening on a side of an inner surface of the housing.

### Claim 14 (depends on 13)

The gas generator according to claim 13, wherein the first closing structure and the second closing structure have specifications identical to each other.

### Claim 15 (depends on 13)

The gas generator according to claim 13, wherein
the first gas discharge port and the second gas discharge port have a circular cross section, and
the first gas discharge port and the second gas discharge port are different from each other in a diameter of the opening on the side of the inner surface of the housing.

### Claim 16 (depends on 13)

The gas generator according to claim 13, wherein
each of the first gas discharge port and the second gas discharge port includes:
a straight portion having a constant cross section in a thickness direction of the housing, and
a tapered portion continuous with the straight portion and having a cross-sectional area increasing with distance from the straight portion in the thickness direction,
one of the first gas discharge port and the second gas discharge port is provided with the tapered portion on the side of the inner surface of the housing and the straight portion on a side of an outer surface of the housing, and
the other of the first gas discharge port and the second gas discharge port is provided with the straight portion on the side of the inner surface of the housing, and the tapered portion on the side of the outer surface of the housing.

### Claim 17 (depends on 16)

The gas generator according to claim 16, wherein
the straight portion is constituted by a shear surface, and
the tapered portion is constituted by a fracture surface.

### Claim 18 (depends on 13)

The gas generator according to claim 13, wherein
a protruding portion protruding toward the inside of the housing is formed at a part of a peripheral edge of the opening on the side of the inner surface of the housing of only one of the first gas discharge port and the second gas discharge port, and
one of the first closing structure and the second closing structure is attached to the inner surface of the housing while covering the protruding portion.

### Claim 19 (depends on 13)

The gas generator according to claim 13, wherein
a peripheral edge of the opening on the side of the inner surface of the housing of only one of the first gas discharge port and the second gas discharge port is chamfered.