JP5073337B2 - Igniter assembly - Google Patents

Description

  The present invention relates to an igniter assembly and a gas generator for a personnel restraint device using the igniter assembly.

  An igniter assembly is used as a starting device for a gas generator for inflating a vehicle airbag or another airbag. In this igniter assembly, an igniter body including an igniting agent and a conductive pin is fixed to an igniter collar, and the igniter collar is inserted into a gas generator and fixed.

  Conventionally, when an igniter assembly is attached to a gas generator, a caulking method that does not generate heat is used in consideration of safety. Caulking is a method of deforming a cylindrical fixed part formed in a gas generator housing toward an igniter collar and making contact and fixation so as to press the igniter collar, and means for deforming the cylindrical fixed part For example, rolling caulking is known in which a rotating roller is deformed by being applied to a fixed portion.

Patent Document 1 discloses that the igniter assembly inserted in the gas generator is not rotated or rattled by the vibration generated during caulking work of the igniter. It is disclosed to form a protrusion that abuts a gas generator housing (specifically, an inner tube). This method uses the friction between the resin protrusion and the inner tube to prevent rotation, but the friction coefficient varies depending on the type and shape of the resin and the surface roughness of the inner tube. There is room for improvement in order to increase the effect of preventing the rotation and rattling of the solid.
JP 2001-165600 A

  The present invention has been made to solve the above-mentioned problems, and when the igniter assembly is attached to the gas generator by caulking, the igniter assembly is easy to position without rotation or rattling. And a gas generator for a personnel restraint device using the igniter assembly.

[Claim 1]
The invention of claim 1 is a solution to the problem.
An igniter assembly used by being attached to a gas generator, wherein an igniter body and an igniter collar are integrated with a resin,
Provided is an igniter assembly, wherein the igniter assembly has a convex and concave portion in a portion that contacts an inner wall surface of the gas generator when the igniter assembly is attached to the gas generator.

  The igniter assembly of the present invention is used for a person restraining device such as an air bag device, and as described above, the portion that contacts the inner wall surface of the gas generator when attached to the gas generator. It is well-known except for having a convex-concave part, and it can be set as the same structure as what is disclosed by patent document 1, Unexamined-Japanese-Patent No. 2003-161599, etc.

  The igniter assembly of the present invention has a convex / concave portion in a portion that contacts the inner wall surface of the gas generator when the igniter assembly is attached to the gas generator. Since the solid body is prevented from rotating or rattling, the attachment work is easy.

  The convex and concave portions can be obtained by forming grooves on a predetermined surface of the igniter assembly by a known method (forging, cutting, molding of a predetermined shape, etc.). The height of the unevenness (the distance from the top surface of the convex portion to the bottom surface of the concave portion) is preferably 0.2 to 3.0 mm. The cross-sectional shape in the width direction of the unevenness can be a triangle, a quadrangle (square, rectangle, trapezoid), a semicircle, or the like.

[Claim 2]
The invention of claim 2 provides the igniter assembly according to claim 1, wherein the convex and concave portions are formed radially outward from the center of the igniter body as another means for solving the problem.

  By forming the projections and depressions in a radial pattern, the effect of preventing rotation at the time of mounting work by caulking the igniter assembly is enhanced.

[Claim 3]
According to a third aspect of the present invention, as another means for solving the problem, the igniter assembly has one or two or more annular planes formed around the igniter main body, and the convex recess is the An igniter assembly according to claim 1 or 2, wherein the igniter assembly is formed in at least one of one or more annular planes.

  The igniter assembly has a structure in which an igniter body is integrated in a metal igniter collar with a resin interposed between the resin and / or metal (igniter collar) so as to surround the igniter body. An annular plane is formed. If it is an annular plane, irregularities are easy to form, and it is particularly easy to form it radially.

[Claim 4]
The invention of claim 4 provides the igniter assembly according to any one of claims 1 to 3, wherein the convex and concave portions are formed in the resin portion as another means for solving the problem. If it is a resin part, formation of unevenness will become easier.

[Claim 5]
The invention of claim 5 is a means for solving other problems.
A gas generator comprising the igniter assembly according to claim 1,
The gas generator has a concavo-convex portion on an inner wall surface in contact with the concavo-convex portion of the igniter assembly;
A gas generator is provided in which the igniter assembly is press-contacted in a state where the convex and concave portions and the concave and convex portions of the inner wall surface are engaged with each other.

  Caulking is applied when fixing the igniter assembly to the gas generator. Therefore, by making the convex / concave portion of the igniter assembly and the concave / convex portion of the inner wall surface of the gas generator mesh with each other, rotation is prevented and the mounting operation (caulking operation) becomes easy, and then caulking is performed. Thus, since the convex and concave portions and the concave and convex portions that are meshed with each other are pressed, rattling and the igniter assembly do not rotate. Furthermore, positioning of the igniter assembly is facilitated. The positioning of the igniter is important because the lead wire of the connector to be connected is pulled out in a predetermined direction.

[Claim 6]
The invention of claim 6 is another solution to other problems.
A gas generator comprising the igniter assembly according to claim 1,
Provided is a gas generator in which an inner wall surface of the gas generator and a convex / concave portion of the igniter assembly are pressed against each other, and the convex / concave portion of the igniter assembly is crushed and deformed against the inner wall surface. To do.

  By doing in this way, the inner wall surface of the said gas generator can also be left as a smooth surface, without processing. As in the fifth aspect of the invention, the caulking work is facilitated, and rattling prevention and rotation prevention effects can be obtained.

  The igniter assembly of the present invention has a convex concave portion in a portion that contacts the inner wall surface of the gas generator when attached to the gas generator, and is attached to the gas generator by the action of the convex concave portion. There is no rotation or rattling during the caulking work. For this reason, attachment work becomes easy.

(1) The igniter assembly shown in FIGS. 1 and 2 and the gas generator shown in FIG. 3 using the igniter assembly <Ignator assembly>
FIG. 1 is a perspective view of the igniter assembly of the present invention, and FIG. 2 is a longitudinal sectional view of FIG.

  The igniter assembly 10A includes an igniter body 20 and an igniter collar 30 integrated with a resin 25. The basic structure itself is well known (Patent Document 1, etc.), but has a convex recess 40. It is a feature.

  The igniter body 20 is filled with an ignition powder 22 in a cup 21, and has two conductive pins 23 connected by a bridge wire (heating element) 24.

  The igniter collar 30 is made of a substantially cylindrical metal, and the igniter main body 20 is inserted into the central through-hole, where the igniter main body 20 and the igniter collar 30 are integrated with the resin 25. ing.

  The igniter assembly 10 </ b> A has a first annular plane 26 made of a resin 25 and a second annular plane 32 made of a metal igniter collar 30.

  The convex recesses 40 are formed on the entire surface of the first annular plane 26, and the convex portions 41 and the concave portions 42 are alternately and outward from the central portion of the igniter body 20 (the central portion of the top surface of the cup 21). It forms so that it may become radial toward. As shown in the figure, the convex recess 40 may be formed only on the first annular plane 26, or may be formed only on the second annular plane 32, or the first annular plane 26 and the second annular plane 26. It may be formed on both of the planes 32.

  1 is formed on the entire surface of the first annular plane 26 in FIG. 1, it may be partially formed (for example, separated and formed at a plurality of locations), and the remaining surface is a smooth surface. Can be.

  The cross section of the convex portion 41 in the width direction is a square and the height is about 0.8 mm. About 3 to 20 convex portions 41 can be formed in the circumferential direction.

<Gas generator>
FIG. 3 is a longitudinal sectional view of the gas generator to which the igniter assembly shown in FIGS. 1 and 2 is attached, and FIG. 4A is a contact between the inner wall surface of the gas generator and the igniter assembly in FIG. FIG. 4B is a partially enlarged view of a part, and FIG. 4B is a partial cross-sectional view in a vertical direction perpendicular to FIG.

  The gas generator itself to which the igniter assembly 10A is attached is a known one, and for example, the one shown in FIG.

  In the gas generator 100 </ b> A shown in FIG. 3, an inner cylinder member (that is, an inner tube) 113 is disposed in a housing 103 composed of a diffuser shell 101 and a closure shell 102. An ignition means accommodation chamber 123 is formed inside the inner cylinder member 113, and a combustion chamber 122 is formed outside the inner cylinder member 113. The ignition means accommodation chamber 123 and the combustion chamber 122 are communicated with each other through a heat transfer hole 126 closed with a seal tape.

  In the ignition means accommodating chamber 123, as an ignition means that operates by impact to ignite and burn the gas generating agent 106, the igniter assembly 10A shown in FIGS. 1 and 2 and the igniter assembly 10A are operated. A charge 105 to be ignited and burned is contained.

  In the combustion chamber 122, a gas generating agent 106 and a substantially disk-shaped under plate 118 that supports the gas generating agent 106 and prevents its movement are disposed.

  A plurality of gas discharge ports 111 are formed in the circumferential wall portion 110 of the diffuser shell 101 at equal intervals in the circumferential direction, and the gas discharge ports 111 are closed by a seal tape 125. The diffuser shell 101 and the closure shell 102 have their flange portions 115 and 116 overlapped in the vicinity of the center in the axial direction of the housing 103, and are laser welded at the overlapped portion.

  As shown in FIGS. 3 and 4A, the convex recesses 40 formed radially on the first annular plane 26 of the igniter assembly 10 </ b> A are in pressure contact with the step surface 140 of the inner cylinder member 113. As shown in FIG. 4B, the convex portion 41 of the convex concave portion 40 and the concave portion 142 of the stepped surface 140 mesh with each other at the pressure contact portion between the convex concave portion 40 and the stepped surface 140. The portions 141 are engaged with each other while being pressed against each other.

  When the igniter assembly 10 </ b> A is fitted into the housing 103, the igniter assembly 10 </ b> A can be easily positioned by engaging the stepped surface 140 of the convex recess 40 and the inner cylinder member 113 as described above. When the lower end peripheral portion 121 of the inner cylinder member 113 is caulked by a method such as rolling caulking, an axial force is applied such that the convex and concave portions 40 are pressed against the stepped surface 140, and the igniter assembly 10A rotates. Since it does not rattle, the caulking work is easy. Further, after caulking, the axial force is maintained, and the convex and concave portions 40 and the stepped surface 140 meshing with each other are pressed against each other, so that the airtightness in the ignition means accommodating chamber 123 is also improved.

  In the state shown in FIG. 4B, the convex portion 41 may be crushed and deformed by an axial force applied during caulking. In such a case, the concave portion 142 of the stepped surface 140 is made larger than the convex portion 41 so that a gap is generated, and when the convex portion 41 is crushed and deformed, the gap is closed, and the convex portion 41 and the recess 142 may be in close contact with each other.

(2) The igniter assembly shown in FIG. 5 and the gas generator shown in FIG. 6 using the igniter assembly <igniter assembly>
FIG. 5 is a perspective view of the igniter assembly of the present invention. The igniter assembly 10B shown in FIG. 5 and the igniter assembly 10A shown in FIGS. 1 and 2 have the same internal structure, but have different external shapes.

  In the igniter assembly 10B, convex concave portions 50 including convex portions 51 and concave portions 52 are formed radially and at equal intervals on the entire surface on the second annular plane 32 (see FIG. 1). The cross section of the convex portion 51 in the width direction is an equilateral triangle. The height of the convex portion 51 is about 0.8 mm. About 3 to 20 convex portions 41 can be formed in the circumferential direction.

<Gas generator>
6 is a longitudinal sectional view of a gas generator to which the igniter assembly shown in FIG. 5 is attached. The gas generator 100B of FIG. 6 is different from the gas generator 100A shown in FIG. 3 in that the height of the step surface 150 of the inner cylinder member 113 is lower than the step surface 140, and the step surface 150 is a smooth surface. Is exactly the same.

  The step surface 150 is a smooth surface, and before crimping the lower peripheral edge portion 121 of the inner cylinder member 113, the triangular vertex portion of the convex portion 51 corresponds to the smooth surface of the step surface 150 in terms of a cross-sectional shape. In contact. When the lower end peripheral portion 121 is caulked, if a force in the axial direction is applied, the convex portion 51 is deformed so as to be easily crushed and pressed against the step surface 150. For this reason, since the igniter assembly 10B does not rotate, the caulking work is easy, and the airtightness in the ignition means housing chamber 123 is improved.

  The step surface 150 may have the same unevenness as the step surface 140 shown in FIG. 4B, and the convex portion 51 having a triangular section may be fitted into the concave portion. In this case, the convex portion 51 having a triangular cross section is crushed and deformed by the force applied during caulking, and is brought into close contact with the concave portion.

The perspective view of the igniter assembly of this invention. The longitudinal cross-sectional view of FIG. The longitudinal cross-sectional view of the gas generator which attached the igniter assembly of FIG. (A) is the elements on larger scale of FIG. 3, (b) is sectional drawing of the direction orthogonal to (a). The perspective view of the igniter assembly of another embodiment of this invention. The longitudinal cross-sectional view of the gas generator which attached the igniter assembly of FIG.

Explanation of symbols

10A, 10B igniter assembly 20 igniter body 25 resin 26 first annular plane 30 igniter collar 32 second annular plane 40 convex recess
100A, 100B gas generator
113 Inner tube member
140, 150 Stepped surface

Claims (5)

An igniter assembly used by being attached to a gas generator, wherein an igniter body and an igniter collar are integrated with a resin,
Wherein the igniter assembly has an igniter has one or more annular plane formed around the body, in contact with the inner wall surface of the gas generator when attached to the gas generator An igniter assembly , wherein the convex and concave portions are formed in at least one of one or more annular planes .   The igniter assembly according to claim 1, wherein the convex and concave portions are formed radially outward from a central portion of the igniter body. The igniter assembly according to claim 1 or 2 , wherein the convex recess is formed in the resin portion. A gas generator comprising the igniter assembly according to any one of claims 1 to 3 ,
The gas generator has a concavo-convex portion on an inner wall surface in contact with the concavo-convex portion of the igniter assembly;
The gas generator, wherein the igniter assembly is pressed in a state where the convex and concave portions and the concave and convex portions of the inner wall surface are engaged with each other. A gas generator having an igniter assembly according to any one of claims 1 to 3
A gas generator, wherein an inner wall surface of the gas generator and a convex / concave portion of the igniter assembly are pressed against each other, and the convex / concave portion of the igniter assembly is crushed and deformed against the inner wall surface.

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