CN-116917167-B - Igniter assembly and gas generator

Abstract

The igniter assembly comprises an igniter including a metal container and an initiating explosive, wherein the metal container includes a tubular peripheral wall portion and a cover wall portion closing one end of the peripheral wall portion, the initiating explosive is filled in a containing space defined by the peripheral wall portion and the cover wall portion, the cover wall portion is broken when the igniter is operated, thereby releasing combustion products of the initiating explosive to the outside of the container, and the resin tubular wall portion is formed into a tubular shape so as to surround the peripheral wall portion, a release space for releasing the combustion products of the initiating explosive is formed at the inside, the cover wall portion includes an annular outer peripheral region portion connected to one end of the peripheral wall portion, and a central region portion located at the inner side in the radial direction of the peripheral wall portion than the outer peripheral region portion, and the outer peripheral region portion is formed as a wall thicker than the central region portion.

Inventors

• Fu Daobin
• YAMAMOTO SHINYA

Assignees

• 株式会社大赛璐

Dates

Publication Date

20260512

Application Date

20220131

Priority Date

20210204

Claims (6)

1. 1. An igniter assembly comprising: An igniter comprising a metallic container having a tubular peripheral wall portion and a lid wall portion closing one end portion of the peripheral wall portion, and an initiating explosive filled in a containing space defined by the peripheral wall portion and the lid wall portion, the lid wall portion being broken when the igniter is operated, whereby combustion products of the initiating explosive are discharged to the outside of the container, and A resin cylindrical wall portion formed in a cylindrical shape so as to surround the peripheral wall portion, and an escape space for escape of combustion products of the primary explosive is formed inside, The cover wall portion includes an annular outer peripheral region portion disposed inward of the peripheral wall portion in a radial direction of the peripheral wall portion, and a central region portion disposed inward of the outer peripheral region portion in the radial direction, The outer periphery of the outer peripheral region portion is connected to the peripheral wall portion at a first connection portion, the outer periphery of the central region portion is connected to the outer peripheral region portion at a second connection portion, The peripheral region portion is formed as a thicker wall than the central region portion, When the igniter is operated, the annular outer peripheral region portion is configured to be deformed upward at a first angle with respect to a central axis of the igniter at the first connection portion, and the central region portion is configured to be deformed upward at a second angle with respect to the annular outer peripheral region portion at the second connection portion.
2. 2. The igniter assembly of claim 1 wherein, The outer peripheral region portion and the central region portion are connected such that a discharge surface facing the discharge space in the cover wall portion is recessed in the central region portion.
3. 3. The igniter assembly of claim 1 or 2 wherein, The central region is formed with a plurality of grooves extending radially from a central portion of the central region.
4. 4. The igniter assembly of claim 1 or 2 wherein, The distance in the radial direction from the center portion of the center region portion to the outer peripheral region portion is 1/2 or less of the distance in the radial direction from the center portion to the cylindrical wall portion.
5. 5. The igniter assembly of claim 1 or 2 wherein, The discharge space is filled with a first gas generant ignited by the combustion products of the primary explosive.
6. 6. A gas generator is provided with: the igniter assembly of any one of claims 1 through 5; A housing equipped with the igniter assembly; a combustion chamber formed in the housing and filled with a second gas generating agent burned by the operation of the igniter, and And a gas discharge hole formed in the housing to communicate the combustion chamber with an external space of the housing.

Description

Igniter assembly and gas generator Technical Field The present invention relates to an igniter assembly and a gas generator including the igniter assembly. Background An igniter is known as an initiator for an airbag gas generator, a seat belt retractor gas generator, or the like, and is mainly operated by an ignition current. As a structure for mounting an igniter to a gas generator, an igniter assembly is known in which the igniter is mounted to a tubular member provided in a housing via a resin. In this regard, in the gas generator shown in patent document 1, a cylindrical fitting portion to which an igniter is fitted is formed in a central portion of a bottom plate of a housing, and the igniter is fixed to the fitting portion by a resin provided between the igniter and the fitting portion. The resin also forms a peripheral wall portion surrounding the igniter, and a space inside the peripheral wall portion is filled with a gas generating agent that burns by the operation of the igniter. A space into which a connector for supplying current to the igniter is inserted is formed at the other end side of the fitting portion. Prior art literature Patent literature Patent document 1 specification of U.S. Pat. No. 7540241 Patent document 2 specification of U.S. Pat. No. 5005486 Disclosure of Invention Problems to be solved by the invention When the igniter is operated, the metallic container containing the primary explosive is broken, and a flame is discharged. In the structure in which the igniter is surrounded by the resin peripheral wall portion, when the container that is broken by the operation of the igniter is in contact with the peripheral wall portion, the peripheral wall portion is deformed by the load acting on the peripheral wall portion, and cracks or breakage may occur in the peripheral wall portion. In such a case, the igniter may be insufficiently held or the sealing performance as a gas generator may be impaired due to a crack or a broken state. The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a technique capable of suppressing a large load from being applied to a peripheral wall portion by a lid wall portion of a cup that breaks when an igniter is operated, in an igniter assembly having a structure in which the peripheral wall portion is surrounded by a resin peripheral wall portion. Technical proposal In order to solve the above-described problems, the technology of the present disclosure adopts the following configuration. Specifically, the technology of the present disclosure is an igniter assembly including an igniter including a metal container and an initiating explosive, the metal container having a tubular peripheral wall portion and a cap wall portion closing one end of the peripheral wall portion, the initiating explosive being filled in a containing space defined by the peripheral wall portion and the cap wall portion, the cap wall portion being broken when the igniter is operated, whereby a combustion product of the initiating explosive is discharged to the outside of the container, and a resin tubular wall portion formed in a tubular shape so as to surround the peripheral wall portion, a discharge space in which the combustion product of the initiating explosive is discharged being formed inside, the cap wall portion including an annular outer peripheral region portion arranged to be located inside the peripheral wall portion in a radial direction of the peripheral wall portion, and a central region portion arranged to be located inside the peripheral region portion in the radial direction, the outer peripheral region portion being formed as a wall thicker than the central region. When the igniter is operated, the lid wall portion is deformed so as to open to the discharge space side from one end portion of the peripheral wall portion due to the combustion pressure of the primary explosive. In this case, in the igniter assembly of the present disclosure, the outer peripheral region portion is formed as a thicker wall than the central region portion, and therefore, the outer peripheral region portion is more rigid than the central region portion and less likely to deform. Accordingly, the outer peripheral region connected to the peripheral wall portion is less likely to deform, and the cover wall portion is prevented from being greatly opened. Therefore, the cracked cap wall portion is restrained from strongly contacting the cylindrical wall portion. That is, the cracked cap wall portion does not come into contact with the cylindrical wall portion or generate a large load even if it comes into contact. As a result, according to the igniter assembly of the present disclosure, a large load is suppressed from being applied to the cylindrical wall portion by the cracked cap wall portion when the igniter is operated, and occurrence of defects such as cracks and breakage in the cylindrical wall portion can be prevented. In