CN-116853171-B - Gas generator

Abstract

The present invention relates to gas generators. The igniter holding structure includes an igniter having an ignition portion including an ignition charge and a conductive pin extending from the ignition portion, a first resin portion made of resin provided between the igniter and the mounting portion, the igniter being held such that a tip of the ignition portion and a tip of the conductive pin are located opposite to each other through a through hole and the conductive pin is surrounded by a peripheral wall portion, and a second resin portion made of resin provided on the peripheral wall portion, the second resin portion being provided on the inner side of the peripheral wall portion so as to form a connector insertion portion that is a space into which a connector connected to the conductive pin can be inserted, the second resin portion being provided on the inner side of the peripheral wall portion so as to form an exposed surface made of metal exposed to the connector insertion portion, the exposed surface being formed on the peripheral wall portion so as to be spaced apart from the first resin portion.

Inventors

• MIKIO HIRANO
• San Guodu
• KATO KAZUYA

Assignees

• 株式会社大赛璐

Dates

Publication Date

20260512

Application Date

20200805

Priority Date

20190830

Claims (13)

1. 1. A gas generator is provided with: An igniter having an ignition portion including an ignition charge and a conductive pin extending from the ignition portion; a metal mounting portion having a through hole through which the igniter passes and a peripheral wall portion including an inner surface of the through hole, for mounting the igniter; A first resin portion provided between the igniter and the mounting portion and holding the igniter such that the ignition portion and the tip end of the conductive pin are located opposite to each other through the through hole and the conductive pin is surrounded by the peripheral wall portion, and A second resin portion provided on the peripheral wall portion, a connector insertion portion formed inside the peripheral wall portion as a space into which a connector connected to the conductive pin can be inserted, The peripheral wall portion has a rear peripheral wall portion having a metal exposed surface exposed to the connector insertion portion, and a front peripheral wall portion formed on a front side of the rear peripheral wall portion in an insertion direction of the connector into the connector insertion portion, the front peripheral wall portion being formed to have a larger inner diameter than the rear peripheral wall portion, an annular step being formed between the front and rear peripheral wall portions, The second resin portion is provided on the near side peripheral wall portion at a distance from the first resin portion on the inner side of the peripheral wall portion so that the exposed surface is formed on the peripheral wall portion, The second resin portion forming the connector insertion portion is formed on a front side of the exposed surface in the insertion direction of the connector, is flush with the exposed surface, or is located on an inner side of the peripheral wall portion than the exposed surface.
2. 2. The gas generator of claim 1, wherein, The exposed surface is formed as a part of the peripheral wall portion exposed to the connector insertion portion due to the second resin portion being spaced apart from the first resin portion inside the peripheral wall portion.
3. 3. The gas generator according to claim 1 or 2, wherein, In the mounting portion, a connection hole penetrating from the first resin portion side to the second resin portion side through the peripheral wall portion is formed in addition to the through hole, The first resin portion and the second resin portion are connected inside the connection hole.
4. 4. The gas generator according to claim 1 or 2, wherein, The near-front side peripheral wall portion is expanded more than the exposed surface toward the outside of the peripheral wall portion, The second resin portion is provided on the near-front side peripheral wall portion so as not to hinder insertion of the connector into the connector insertion portion.
5. 5. The gas generator according to claim 3, wherein, The near-front side peripheral wall portion is expanded more than the exposed surface toward the outside of the peripheral wall portion, The second resin portion is provided on the near-front side peripheral wall portion so as not to hinder insertion of the connector into the connector insertion portion.
6. 6. The gas generator of claim 4, wherein, A step portion is formed between the exposed surface and the connector introduction surface so that the connector introduction surface, which is a surface of the second resin portion facing the connector, is positioned inside the peripheral wall portion with respect to the exposed surface, The step portion is configured to restrict the removal of the connector from the connector insertion portion by engagement of a protruding portion protruding from the connector with the step portion when the connector is inserted into the connector insertion portion.
7. 7. The gas generator according to claim 1 or 2, wherein, The exposed surface is configured to be capable of contacting with the ground terminal when the connector provided with the ground terminal is inserted into the connector insertion portion.
8. 8. The gas generator according to claim 3, wherein, The exposed surface is configured to be capable of contacting with the ground terminal when the connector provided with the ground terminal is inserted into the connector insertion portion.
9. 9. The gas generator according to claim 1 or 2, wherein, The first resin portion includes: A holding part for holding the igniter such that the ignition part and the tip of the conductive pin are located opposite to each other through the through hole and the conductive pin is surrounded by the peripheral wall part, and A tubular portion formed in a tubular shape having one end connected to the holding portion and the other end closed, the tubular portion accommodating a part of the ignition portion inside, and a combustion chamber accommodating a gas generating agent that is combusted by operation of the ignition portion being formed between the tubular portion and the ignition portion, The holding portion is integrally formed with the cylindrical portion.
10. 10. The gas generator according to claim 3, wherein, The first resin portion includes: A holding part for holding the igniter such that the ignition part and the tip of the conductive pin are located opposite to each other through the through hole and the conductive pin is surrounded by the peripheral wall part, and A tubular portion formed in a tubular shape having one end connected to the holding portion and the other end closed, the tubular portion accommodating a part of the ignition portion inside, and a combustion chamber accommodating a gas generating agent that is combusted by operation of the ignition portion being formed between the tubular portion and the ignition portion, The holding portion is integrally formed with the cylindrical portion.
11. 11. The gas generator of claim 7, wherein, The first resin portion includes: A holding part for holding the igniter such that the ignition part and the tip of the conductive pin are located opposite to each other through the through hole and the conductive pin is surrounded by the peripheral wall part, and A tubular portion formed in a tubular shape having one end connected to the holding portion and the other end closed, the tubular portion accommodating a part of the ignition portion inside, and a combustion chamber accommodating a gas generating agent that is combusted by operation of the ignition portion being formed between the tubular portion and the ignition portion, The holding portion is integrally formed with the cylindrical portion.
12. 12. The gas generator of claim 4, wherein, The peripheral wall portion has a connecting portion connecting the near-front peripheral wall portion and the rear peripheral wall portion, The second resin portion covers the connection portion and the near-front side peripheral wall portion inside the peripheral wall portion.
13. 13. A gas generator is provided with: An igniter having an ignition portion including an ignition charge and a conductive pin extending from the ignition portion; a metal mounting portion having a through hole through which the igniter passes and a peripheral wall portion including an inner surface of the through hole, for mounting the igniter; A first resin portion provided between the igniter and the mounting portion and holding the igniter such that the ignition portion and the tip end of the conductive pin are located opposite to each other through the through hole and the conductive pin is surrounded by the peripheral wall portion, and A second resin portion provided on the peripheral wall portion, a connector insertion portion formed inside the peripheral wall portion as a space into which a connector connected to the conductive pin can be inserted, The peripheral wall part comprises a back peripheral wall part, a metal annular member arranged on the inner side of the back peripheral wall part, and a front side peripheral wall part formed on the front side of the back peripheral wall part in the insertion direction of the connector relative to the connector insertion part, The inner peripheral wall portion and the front peripheral wall portion provided with the second resin portion are formed to have the same diameter, The second resin portion is provided at a distance from the first resin portion inside the peripheral wall portion so that an exposed surface of metal exposed to the connector insertion portion is formed on the inner surface of the annular member, The second resin portion forming the connector insertion portion is formed on a front side of the exposed surface in the insertion direction of the connector and is flush with the exposed surface.

Description

Gas generator The application is a divisional application of Chinese application patent application (PCT application No. PCT/JP 2020/030025) with application date of 2020, 8-5, application No. 202080060475.3 and the application name of 'igniter holding structure'. Technical Field The present invention relates to an igniter holding structure for a gas generator. Background An igniter is used as an actuator for an airbag gas generator, a seat belt retractor gas generator, or the like, and an electric igniter that operates mainly by an ignition current is known. As a structure for attaching an igniter to a gas generator, a structure is known in which the igniter is attached 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 mounting portion to which an igniter is mounted is formed in a central portion of a bottom plate of a housing, and the igniter is fixed to one end side of the mounting portion by a resin provided between the igniter and the mounting portion. The resin also forms a space for insertion of a connector for supplying current to the igniter at the other end side of the mounting portion. In the gas generator shown in patent document 2, further, a conductive member is buried in the resin, and the conductive member is exposed to the insertion space of the connector so that the ground end of the connector contacts the conductive member. This suppresses accumulation of static electricity in the metal case, and prevents malfunction of the igniter. In the gas generator of patent document 2, a groove through which a resin material flows is formed in the conductive member at the time of injection molding, whereby a resin for holding the igniter and a resin for forming an insertion space of the connector are connected inside the mounting portion, and these resins are formed integrally. Prior art literature Patent literature Patent document 1 specification of U.S. Pat. No. 7540241 Patent document 2 Japanese patent application laid-open No. 2013-227010 Disclosure of Invention Problems to be solved by the invention In the structure in which the igniter is mounted via the resin, as in the prior art, even if the insertion space of the connector is sufficiently secured, if the resin for holding the igniter and the resin for forming the insertion space of the connector are joined inside the mounting portion, the portion where the resins are joined is easily formed to be thin along the inner surface of the mounting portion. This may reduce the strength of the portion, and the resin may be easily damaged. In addition, depending on the kind of resin, there is a property of absorbing moisture, and in this case, if the thickness is thin, moisture tends to be easily absorbed. Therefore, if a thin portion is formed in the resin, moisture may be transferred through the thin portion and easily intrude into the inside of the gas generator. If moisture intrudes into the inside of the gas generator, there is a problem in that it is difficult to maintain the gas generating agent contained in the inside of the gas generator in a dry state, and the performance of the gas generator becomes unstable. 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 damage to the resin and intrusion of moisture in an igniter holding structure for a gas generator for mounting an igniter on a metal mounting portion via the resin. The invention relates to the following: item 1. An igniter holding structure for a gas generator for mounting an igniter on a metal mounting portion, wherein, A through hole through which the igniter passes and a peripheral wall portion including an inner surface of the through hole are formed in the mounting portion, The igniter holding structure is provided with: An igniter having an ignition portion including an ignition charge and a conductive pin extending from the ignition portion; A first resin portion provided between the igniter and the mounting portion and holding the igniter such that the ignition portion and the tip end of the conductive pin are located opposite to each other through the through hole and the conductive pin is surrounded by the peripheral wall portion, and A second resin portion provided on the peripheral wall portion, a connector insertion portion formed inside the peripheral wall portion as a space into which a connector connected to the conductive pin can be inserted, The second resin portion is provided at a distance from the first resin portion inside the peripheral wall portion so that an exposed surface of metal exposed to the connector insertion portion is formed on the peripheral wall portion. Item 2. The igniter retaining structure of item 1, wherein, The exposed surface is formed as a part of the peripheral wall portion exposed to the connector insertion portion due to the second resin portion being spaced