JP2016159654A - Air bag and air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag and an air bag device capable of facilitating insertion of a retainer into an air bag body and preventing pulling-out of a holding member from the air bag body.SOLUTION: A slit part 63 enabling insertion of a retainer holding an inflator into a gas inlet 61 and an air bag body 56 is notched in reinforcing cloth disposed along the outer edge part of the air bag body 56 and the gas inlet 61 to be continuous from the gas inlet 61. The slit part 63 has an intersection part 63b formed at the tip of an extension part 63a extending from the gas inlet 61 outward to extend in a direction intersecting the extension part 63a. A second sewing part 66 for sewing the reinforcing cloth and the air bag body 56 to each other is formed along the outer edge part of the gas inlet 61, and both ends 66a and 66b are positioned closer to the extension part 63a side than at least one of the ends extending from the extension part 63a side of the intersection part 63b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an airbag in which a reinforcing cloth disposed along an outer edge portion of a gas introduction port is sewn to an airbag main body portion by a sewing portion, and an airbag apparatus including the airbag.

  2. Description of the Related Art Conventionally, for example, an airbag device provided in a steering wheel that is a steering wheel of an automobile or an instrument panel is known. The airbag device includes an inflator for supplying gas, and an airbag having an airbag main body that is configured in a bag shape by a single or a plurality of base fabrics and is folded into a predetermined shape. In the event of a car collision or the like, gas is supplied from the inflator to inflate and deploy the airbag main body in front of the occupant to alleviate the impact applied to the occupant.

  In such an airbag, a gas introduction port into which the inflator is inserted is opened in the airbag main body. Around the gas inlet, there is a reinforcing cloth for reinforcing the base fabric of the airbag main body, the pressure or temperature of the gas injected from the inflator, or the gas injected from the inflator. A rectifying body to be rectified is overlapped on the base fabric of the airbag main body and integrally sewn (see, for example, Patent Documents 1 and 2).

JP 7-156735 A (page 2-3, FIG. 3) JP-A-10-226294 (Page 3-5, Fig. 1-2)

  By the way, the inflator is held and fixed to the case body integrally with the airbag body by a retainer as a holding member disposed inside the airbag body. Therefore, a slit for facilitating insertion of the retainer into the airbag main body may be provided continuously with the gas inlet. In the case of this configuration, a sewing line between the reinforcing cloth or the rectifying body and the airbag main body is formed around the slit. For this reason, the sewing line is separated from the gas inlet, so that the retainer inserted into the airbag main body part is pulled out, or the sewing line is folded so that the airbag main body part is overlaid on the retainer. As a result of protruding upward from the side wall of the retainer, there is a concern that the gas injected from the inflator directly hits the sewing line without being blocked by the side wall of the retainer and causes damage. Therefore, a configuration is desired in which the retainer can be prevented from being detached from the airbag body while facilitating insertion of the retainer into the airbag body.

  The present invention has been made in view of such a point, and includes an airbag that can facilitate the insertion of the retainer into the airbag body and can prevent the holding member from coming off from the airbag body. An object is to provide an airbag device.

  The airbag according to claim 1 includes a gas introduction port into which an inflator is inserted, and the inflator is inflated by introducing gas into the interior from a state in which the inflator is attached to the case body by a holding member and folded and stored. A bag-shaped airbag body portion to be deployed, a reinforcing cloth that reinforces an outer edge portion of the gas inlet port of the airbag body portion, and a slit cut into the airbag body portion and the reinforcing cloth continuously to the gas inlet port. A slit portion formed, and a linear sewing portion that sews the reinforcing cloth and the airbag main body portion along an outer edge portion of the gas introduction port, and the slit portion includes the gas introduction port. An extended portion extending outwardly from the gas inlet, and a position extending along the direction intersecting the extended portion at the tip of the extended portion and projecting from the holding member And the sewing part is located closer to the extension part than at least one end part extending from the extension part of the intersection part. It is what is located.

  The airbag according to claim 2 is the airbag according to claim 1, wherein the extending portion extends from at least one end portion extending from the extending portion of the slit portion and the extending portion of the sewing portion. At least a part including the portion located on the part side is disposed at a position sandwiched between the airbag body and the holding member for the reinforcing cloth and the case body.

  The airbag according to claim 3 is the airbag according to claim 1 or 2, wherein at least one of the end portions of the sewing portion extends from the extension portion of the intersecting portion. Is located on the extending portion side, and this end portion is folded back and sewn.

  The airbag device according to claim 4 is inserted into the airbag according to any one of claims 1 to 3 and a gas inlet of an airbag main body portion of the airbag, and gas is introduced into the airbag main body portion. An inflator to be supplied; a positioning member for positioning inserted into an intersection of slits of the airbag; and a holding member that is positioned in the airbag body and holds the airbag body and the inflator; The airbag main body and the inflator are attached by the holding member, and a case body that houses the airbag main body in a folded state is provided.

  According to the airbag of the first aspect, the slit portion is formed by cutting the extension portion of the slit portion into the airbag main body portion and the reinforcing cloth continuously from the gas introduction port and outward from the gas introduction port. The retainer can be easily inserted into the airbag main body through the extending portion. Further, the sewing part is formed along the outer edge part of the gas introduction port, and at least a part thereof is positioned on the extension part side from at least one end part extending from the extension part of the intersection part of the slit part. Thus, the position in the vicinity of the extending portion of the slit portion can be reliably reinforced to ensure the holding strength of the holding member, and the holding member can be prevented from coming off from the airbag main body portion.

  According to the airbag according to claim 2, in addition to the effect of the airbag according to claim 1, from at least one end portion extending from the extending portion of the slit portion and the extending portion of the intersecting portion of the sewing portion. Also, at least a part including the part located on the extension part side is arranged at a position sandwiched between the airbag body part and the holding member of the reinforcing cloth and the case body, so that the pressure of the gas of the inflator during deployment can be reduced. On the other hand, at least a part of the extending part of the slit part and the sewing part can be protected, and damage to the gas of the inflator during deployment can be suppressed.

  According to the airbag according to claim 3, in addition to the effect of the airbag according to claim 2, the airbag is positioned closer to the extension part than at least one end part extending from the extension part of the intersecting part of the sewing part. By folding back the end part to be sewn, fraying at the position of the end part of the sewing part can be suppressed, and the sewing strength can be further improved to ensure the holding strength of the holding member. Since the thickness of the airbag is increased at the position, the airbag can be more firmly sandwiched between the holding member and the case body, and damage to the gas of the inflator during deployment can be further suppressed.

  According to the airbag device of the fourth aspect, the retainer can be easily inserted into the airbag main body through the extending portion of the slit portion, and the airbag is deployed while securing the sewing strength of the airbag by the sewing portion. The damage of the airbag with respect to the gas of the inflator at the time can be reduced.

1 is a plan view showing a first embodiment of an airbag and an airbag apparatus of the present invention. (A) is a cross-sectional view taken along the line II in FIG. 1, (b) is a cross-sectional view taken along the line II-II in FIG. 1, and (c) is a cross-sectional view taken along the line III-III in FIG. It is a disassembled perspective view of an airbag apparatus same as the above. It is a top view which expands and shows a part of airbag same as the above. It is a side view which shows the expansion | deployment state of the airbag main-body part of an airbag same as the above. It is a top view which shows a part of 2nd Embodiment of the airbag and airbag apparatus of this invention.

  Hereinafter, a first embodiment of an airbag of the present invention will be described with reference to the drawings.

  1, 3 and 5, reference numeral 10 denotes an airbag device. The airbag device 10 is positioned in front of an occupant A as a passenger seat of an automobile 11 as a vehicle, for example, an object to be protected in the passenger seat. An airbag device 10 for passengers on the passenger seat is configured by being arranged inside an instrument panel portion 14 as an installation portion. Hereinafter, the front-rear direction, the both-side direction, and the up-down direction will be described based on the straight traveling direction of the automobile 11 with the airbag device 10 attached to the automobile 11, respectively. Further, in FIG. 5, the occupant A is indicated by a dummy.

  The instrument panel portion 14 is formed into a curved surface or the like slightly lowered toward the rear side, that is, the passenger seat side by a member such as a synthetic resin, for example, and is a mounted member disposed inside the instrument panel portion The airbag device 10 is fixed to a steering member (not shown) by screwing or the like with the front side inclined slightly from the upper side to the rear side, that is, the occupant A side. Further, a windshield 15 that is a windshield inclined from the lower front side toward the upper rear side is disposed above the instrument panel portion 14.

  The airbag device 10 can also be called an airbag module, and includes an airbag 21 made of a base fabric, an inflator 22 that supplies gas to the airbag 21, the airbag 21 and the inflator 22 and the like. A retainer 24 as a holding member to hold, a case body 25 to which the airbag 21 and the inflator 22 and the like are attached via the retainer 24, a wrapping member 26 as a shape holding member that wraps the airbag 21 and prevents collapse, and deployment A cover body 27 that covers the front airbag 21 and the wrapping member 26, control means (not shown) that controls the operation of the inflator 22, and the like are provided.

  The inflator 22 includes a columnar (cylindrical) main body portion 22a and, for example, a rectangular flange portion 22b protruding around the main body portion 22a. The inflator 22 is attached to the bottom of the case body 25 from below, for example. 24 is held and fixed to the case body 25. And, inside the main body portion 22a, although not shown, the igniter and the medicine are stored, and the igniter burns the medicine by the electrical signal transmitted from the control means transmitted through the connector connected to the bottom, Expansion gas is rapidly supplied from a gas injection port 22c provided on the outer periphery of the main body 22a. The inflator 22 has various shapes. For example, a single or a plurality of inflators 22 each having a disk-shaped main body can be used. Also, bolt insertion holes 22d are opened in the flange portion 22b, for example, at four corners (only three are shown) spaced apart from each other at substantially equal angles.

  The retainer 24 integrally includes, for example, a retainer main body 31 formed in a rectangular dish shape that is long in the vehicle width direction, and a mounting bolt 32 that protrudes from the retainer main body 31. The retainer body 31 is integrally provided with a substantially rectangular bottom surface portion 33 and a side wall portion 34 as a gas shielding portion raised upward from the outer edge portion of the bottom surface portion 33. In the bottom surface portion 33, for example, a circular inflator insertion opening 35 through which the main body portion 22a of the inflator 22 is inserted is opened. Further, a plate-like positioning flange 36 as a positioning portion for positioning is provided on the bottom surface portion 33 so as to protrude downward. This positioning flange 36 is for clearly indicating the directionality so as not to erroneously assemble the airbag 21 that is folded or shaped according to the deployment characteristics to the case body 25 and the instrument panel portion 14. For example, the retainer 24 (retainer main body 31) is provided so as to protrude toward the opposite side of the side wall portion 34 at a position flush with the side wall portion 34 on one end side in the longitudinal direction. The mounting bolt 32 is also called a stud bolt or the like, and protrudes downward from the vicinity of the outer four corners of the inflator insertion opening 35 of the bottom surface portion 33 of the retainer body 31.

  The case body 25 is formed in a substantially box shape, and the front side or the upper side toward the windshield 15 is a rectangular projecting opening 38 that is an opening, and the inner side is an airbag storage portion 39 for storing the folded airbag 21. It is said that. The projecting port 38 is normally covered with the cover body 27. Further, for example, a circular insertion opening 40 through which the main body 22a of the inflator 22 is inserted is opened at the bottom of the case body 25, and the mounting bolts of the retainer 24 are provided around the insertion opening 40. For example, four bolt insertion holes 41 through which 32 are inserted are opened at substantially equal angles to each other (only two are shown). Further, the case body 25 is provided with a fixing portion and a fixing receiving portion (not shown) for fixing the case body 25 and the cover body 27 to each other by locking or the like.

  The wrapping member 26 is also referred to as a wrapping cloth, a packing cloth, a folding prevention body or the like, and is formed of, for example, synthetic paper, paper, cloth, non-woven fabric, or a resin sheet. The wrapping member 26 is substantially T-shaped or cross-shaped by a first wrapping portion 43 extending in the vehicle width direction and a second wrapping portion 44 extending in a direction intersecting (orthogonal) with respect to the first wrapping portion 43. It is formed in a shape. The wrapping member 26 is, for example, a circular insertion opening through which the main body portion 22a of the inflator 22 is inserted at the center in the vehicle width direction, which is a position where the first wrapping portion 43 and the second wrapping portion 44 intersect. 45 is opened, and bolt insertion holes 46 through which the mounting bolts 32 of the retainer 24 are inserted are opened at a substantially equal angle around the insertion opening 45. In addition, the slit portion 47 is continuously cut in the insertion opening 45.

  The first wrapping portion 43 includes (one and other) wrapping arm portions 43a and 43b extending in the vehicle width direction with respect to the insertion opening 45, and is formed in a substantially rectangular shape that is long in the vehicle width direction. Yes.

  In the second wrapping portion 44, a planned break line 49, which is a fragile slit, is formed across the vehicle width direction.

  The slit portion 47 extends outwardly with respect to the insertion opening 45, extends linearly to one end side in the vehicle width direction along the radial direction of the insertion opening 45, and the extension portion 47a It is formed in a T shape by an intersecting portion 47b extending in both side directions that are continuous with the distal end portion and intersect (orthogonal) the extending portion 47a. The extending portion 47a is for inserting the retainer 24 into the airbag 21, and the intersecting portion 47b is for positioning the retainer 24 by inserting the positioning flange 36 of the retainer 24. .

  The cover body 27 is also called an airbag door panel or an airbag lid. The cover body 27 is formed integrally with or separately from the instrument panel section 14 with a resin, and covers the cover body section 51 facing the airbag 21. And a quadrangular cylindrical partition 52 that projects from the back side of the cover body 51, that is, the airbag 21 and is connected to the case body 25.

  In the cover body 51, a tear line 54 that partitions the cover body 51 and is thinner than other portions and easily breaks is formed on the back side, for example, in an H shape. The cover body 51 forms a quadrangular door that is an airbag inflating door as a door flap that is broken and deployed from the tear line 54 due to the inflation of the airbag 21.

  The partition part 52 is provided with a fixing part and a fixing receiving part (not shown) for fixing the cover body 27 and the case body 25 to each other by locking or the like.

  The airbag 21 shown in FIGS. 1 to 5 includes a bag-shaped airbag main body 56, reinforcing cloths 57 and 58 that are reinforcing members stacked on the airbag main body 56, and a rectifying cloth 59 that is a rectifier. And. Then, for example, a circular gas introduction that is an inflator attachment port through which the main body portion 22a of the inflator 22 passes through the airbag main body 56, the reinforcing cloths 57 and 58, and the rectifying cloth 59. A port 61 is opened, and a bolt insertion hole 62 through which the mounting bolt 32 of the retainer 24 is inserted is opened at a substantially equal angle around the gas introduction port 61. A slit portion 63 is cut continuously. Further, in the airbag 21, the airbag body 56 and the reinforcing cloths 57 and 58 are sewn together with the wrapping member 26 by the first sewing section 65, and the airbag body 56 and the reinforcing cloths 57 and 58 are sewn. The rectifying cloth 59 is sewn together with the wrapping member 26 by a second sewing portion 66 that is a sewing portion.

  The air bag body 56 is attached to the case body 25 by the retainer 24 together with the inflator 22 and stored in the case body 25, and gas is introduced into the inside by the inflator 22 from the folded state to inflate and deploy. It is formed in a bag shape. The airbag main body 56 is formed of a single base fabric or a plurality of base fabrics, and in the present embodiment, the airbag main body 56 has one end in the vicinity of the mounting portion 68 that is a mount having the gas inlet 61 and the other end. The width dimension is substantially constant and the thickness dimension is enlarged toward the tip, which is a portion. That is, the airbag main body 56 includes, for example, a front portion 71 that is an occupant restraint surface facing the occupant A during deployment, a lower surface portion 72 that faces the instrument panel portion 14, an upper surface portion 73 that faces the windshield 15, and these Side portions 74, 74 located on both sides are successively formed. That is, the airbag main body 56 has a bottom surface 72 and a top surface 73 continuous at the base end, a bottom surface 72 is connected to a lower edge of the front surface 71, and an upper edge of the front surface 71. In addition, the upper surface portion 73 is continuous, and the front surface portion 71, the lower surface portion 72, and the side surface portions 74 are continuous on both sides of the upper surface portion 73. Each side surface 74 is formed with an exhaust port (not shown) called a vent hole. In the present embodiment, the front portion 71 and the lower surface portion 72 (attachment portion 68) are doubled, and the side surface portions 74 and 74 are the peripheral sewing portions with respect to the front portion 71 and the lower surface portion 72 (attachment portion 68), respectively. The sewing is performed by 76 (FIG. 2C). It should be noted that a reinforcing body 78 formed of, for example, a belt-like base fabric is integrally sewn in the peripheral sewing portion 76 between the front portion 71 and the side portions 74 and 74 to reinforce the sewing.

  The attachment portion 68 is formed with a gas introduction port 61, a bolt insertion hole 62, and a slit portion 63, respectively, and is a portion that overlaps the reinforcing cloths 57 and 58, the rectifying cloth 59, and the wrapping member 26, and the retainer 24 The position around the gas inlet 61 is sandwiched between the retainer 24 and the case body 25 in the vertical direction.

  The reinforcing cloths 57 and 58 are also called patches or the like, and reinforce the airbag main body 56 at the position of the peripheral edge portion (outer edge portion) of the gas introduction port 61, each formed by a single or a plurality of base cloths, The reinforcing cloth 57 is placed on the outer side of the airbag main body part 56 and the reinforcing cloth 58 is put on the inner side of the airbag main body part 56. The reinforcing cloths 57 and 58 are similar to each other, and the reinforcing cloth 58 is formed to be smaller than the reinforcing cloth 57. The reinforcing cloth bodies 57a and 58a as the substantially annular reinforcing body body, and these reinforcing cloths Projecting reinforcing portions 57b and 58b projecting from the main bodies 57a and 58a toward one end in the vehicle width direction are integrally provided. These reinforcing cloths 57 and 58 are at least partially in the state in which the airbag 21 is stored, and in the present embodiment, the entirety of the reinforcing cloths 57 and 58 together with a part of the outer edge portion of the gas introduction port 61 of the airbag main body 56. It is sandwiched between the bottom portion 33) and the case body 25.

  The reinforcing fabric bodies 57a and 58a are provided over a predetermined width along the periphery of the gas inlet 61. That is, the gas introduction port 61 and the bolt insertion hole 62 are located in the reinforcing cloth main bodies 57a and 58a, respectively.

  The protruding reinforcing portions 57b and 58b are positioned corresponding to the slit portion 63, and reinforce the peripheral edge portion of the slit portion 63. That is, the slit portion 63 is located in the projecting reinforcing portions 57b and 58b.

  The rectifying cloth 59 rectifies the flow of the gas injected from the gas injection port 22c of the inflator 22 in the direction of the lower surface portion 72 and the upper surface portion 73 (vertical direction and front-rear direction). It is formed in a quadrangular shape, overlapped with the reinforcing cloth 58 and sewn integrally with the airbag main body 56, the reinforcing cloth 57, 58 and the wrapping member 26 by the second sewing section 66, and both end portions 59a, 59a are By being sewn together by a rectifying cloth sewing portion 79 as a rectifying body sewing portion, a loop shape facing the gas introduction port 61 is formed.

  The gas introduction port 61 introduces the gas injected from the gas injection port 22c of the inflator 22 into the airbag main body 56 and the circular shape having a diameter substantially equal to the insertion opening 45. And is aligned with the insertion opening 45 and the insertion opening 40 of the case body 25. The gas inlet 61 is located, for example, at a substantially central portion in the vehicle width direction of the airbag 21 (airbag main body portion 56).

  The bolt insertion holes 62 are located on substantially the same circumference, and are aligned with the bolt insertion holes 22d of the inflator 22 and the bolt insertion holes 41 of the case body 25, respectively.

  The slit portion 63 extends outward from the gas introduction port 61 along the radial direction of the gas introduction port 61, in other words, along a line passing through the central portion (center) of the gas introduction port 61. An extending part 63a that extends linearly toward one end in the vehicle width direction, and an intersecting part 63b that extends in both sides that are continuous (perpendicular to) the extending part 63a and continue to the tip of the extending part 63a. Is formed in a T shape. The extending portion 63a is for inserting the retainer 24 into the airbag 21 (airbag main body portion 56), and the intersecting portion 63b is inserted by the positioning flange 36 of the retainer 24. 24 is positioned. This slit part 63 (extension part 63a and intersection part 63b) is aligned with the slit part 47 (extension part 47a and intersection part 47b) of the wrapping member 26.

  The first sewing portion 65 is continuously formed in a loop shape from a position outside the bolt insertion hole 62 to a position outside the slit portion 63. That is, the first sewing portion 65 is formed continuously in a position from the reinforcing cloth main bodies 57a and 58a of the reinforcing cloths 57 and 58 to the reinforcing protrusions 57b and 58b. The slit 63 protrudes so as to bypass the one end side in the vehicle width direction.

  The second sewing portion 66 is arcuate (C-shaped) along a position slightly spaced from the outer edge portion of the gas introduction port 61 on the gas introduction port 61 side of the first sewing portion 65 and the bolt insertion hole 62. It is formed in a linear shape. That is, the second sewing portion 66 is disposed near the gas introduction port 61 at a position between the gas introduction port 61 and the bolt insertion hole 62. Further, the second sewing portion 66 has both end portions 66a and 66b positioned in the vicinity of the slit portion 63, and is separated from each other with the extending portion 63a interposed therebetween. Therefore, the second sewing portion 66 is not continuous in a loop shape. Further, both end portions 66a and 66b of the second sewing portion 66 are close to the extending portion 63a of the slit portion 63 and are positioned between both ends of the intersecting portion 63b. That is, the both end portions 66a and 66b are separated from the extending portion 63a of the slit portion 63 and are located within a predetermined width W between both ends of the intersecting portion 63b. In other words, the both end portions 66a and 66b are located on the extending portion 63a side with respect to both ends of the intersecting portion 63b of the slit portion 63. Therefore, the second sewing portion 66 is formed across the 90 ° range AR from the bolt insertion hole 62 (mounting bolt 32) to the vehicle width direction and the vertical direction perpendicular to the vehicle width direction. , 66b extend outward from the range AR (FIG. 4). The both end portions 66a and 66b of the second sewing portion 66 are folded back to the position of at least both ends of the intersecting portion 63b of the slit portion 63.

  The airbag 21 overlaps the reinforcing fabrics 57 and 58 and the wrapping member 26 on the base fabric constituting the airbag main body 56 and sews them together by the first sewing portion 65, and further to the reinforcing fabric 58. Then, the base cloth, the reinforcing cloths 57 and 58, the current cloth 59, and the wrapping member 26 that constitute the airbag main body 56 are sewn to each other by the second sewing part 66 with the current cloth 59 overlapped. At this time, the second sewing portion 66 continuously sews from either one of the two end portions 66a and 66b to the other, and the both end portions 66a and 66b extend from the both ends of the intersecting portions 63b and 47b. Fold back as the position close to In this state, the gas introduction port 61, the bolt insertion hole 62, and the slit portion 63 of the airbag main body 56, the reinforcing cloths 57, 58, and the rectifying cloth 59 are aligned, and the gas introduction port 61, the bolt insertion The hole 62 and the slit portion 63 are aligned with the insertion opening 45 of the wrapping member 26, the bolt insertion hole 46, and the slit portion 47, respectively. Then, both ends 59a, 59a of the rectifying cloth 59 are sewn by the rectifying cloth sewing part 79 to make the rectifying cloth 59 into a loop shape, and the base cloth constituting the airbag main body part 56 is surrounded by the reinforcing body 78. A bag is formed by sewing by the sewing portion 76.

  Thereafter, the retainer 24 is inserted into the airbag main body 56 from the gas inlet 61, the positioning flange 36 is inserted into the intersecting portions 63b, 47b of the slit portions 63, 47, and the mounting bolt 32 is inserted into the bolt insertion holes 46, The positioning flange 36 and the mounting bolt 32 are pulled out through 62. At this time, the retainer 24 uses the extended portions 63a and 47a of the slit portions 63 and 47 that are continuous to the gas introduction port 61 and the insertion opening 45 to easily expand the gas introduction port 61 and the insertion opening 45. It can be inserted into the main body 56. That is, the extended portions 63a, 47a of the slit portions 63, 47 are connected to the gas introduction port 61 and the insertion opening 45 outward from the gas introduction port 61 and the insertion opening 45, and the airbag main body 56, the reinforcing cloths 57, 58, and By cutting and forming in the wrapping member 26, the retainer 24 can be easily inserted into the airbag main body 56 via the extending portions 63a and 47a of the slit portions 63 and 47.

  In this state, after the airbag main body 56 is expanded, the airbag body 56 is folded into a predetermined shape and wrapped with the first wrapping portion 43 (wrapping arm portions 43a and 43b) and the second wrapping portion 44 of the wrapping member 26 to maintain the shape. At the same time, the mounting bolt 32 is inserted into the bolt insertion hole 41 of the case body 25 in a state where the mounting portion 68 around the gas inlet 61 is pressed against the bottom of the case body 25 by the retainer 24. As a result, the airbag 21 (the airbag main body 56 and the wrapping member 26) is stored in the airbag storage section 39 of the case body 25, and the gas introduction port 61 and the insertion opening 45 and the insertion opening section 40 of the case body 25 are connected. Aligned. Then, for example, from below, the main body portion 22a of the inflator 22 is inserted into the insertion opening 40, the insertion opening 45, the gas introduction port 61, and the inflator insertion opening 35 from the lower side of the case body 25. By inserting the bolt 32 into the bolt insertion hole 22d, screwing a nut (not shown) into the mounting bolt 32, and tightening, the airbag 21 is fastened together and fixed between the retainer 24 and the case body 25, and the retainer The airbag 21 and the case body 25 are fastened and fixed together between the inflator 22 (flange portion 22b) and the nut 24. In this state, the inflator 22 is positioned so that the gas injection port 22c faces the side wall portion 34 of the retainer 24, and the second sewing portion 66 is entirely between the bottom surface portion 33 of the retainer 24 and the bottom portion of the case body 25. The first sewing part 65 is sandwiched vertically between the bottom part 33 of the retainer 24 and the bottom part of the case body 25, and the rest of the first sewn part 65 is sandwiched with the extension part 63a of the slit part 63. Although the portion is located outward from the side wall portion 34 of the retainer 24, the portion does not protrude upward from the side wall portion 34.

  In the airbag apparatus 10 configured as described above, the control means operates the inflator 22 and injects gas from the gas injection port 22c of the inflator 22 in the event of a car collision or the like. The injected gas is rectified by the rectifying cloth 59, the airbag 21 is inflated and deployed with a predetermined deployment characteristic, and the wrapping member 26 is broken from the planned break line 49 and the tear line 54 of the cover body 27 is broken. It protrudes rearward from the projecting port 38 to the front side, spreads ahead of the occupant A seated in the passenger seat, restrains the occupant A by the front portion 71, and protects it from the impact of the collision.

  At this time, the second sewing portion 66 for sewing the airbag main body portion 56 and the reinforcing cloths 57 and 58 (and the rectifying cloth 59) is formed along the outer edge portion of the gas introduction port 61 and intersects with the slit portion 63. By positioning at least one of the ends extending from the extending portion 63a of the 63b, in this embodiment, at least a part closer to the extending portion 63a than both ends, in the present embodiment, the both ends 66a and 66b In addition, it is possible to reliably reinforce the position of the slit portion 63 in the vicinity of both sides of the extending portion 63a to ensure the holding strength of the retainer 24, and to prevent the retainer 24 from coming out of the airbag body portion 56 through the gas introduction port 61 .

  In addition, the extended portion 63a side of the extended portion 63a of the slit portion 63 and at least one of the extended portions 63a of the intersecting portion 63b of the second sewing portion 66 (both ends in the present embodiment). In the present embodiment, at least a part including both end portions 66a and 66b is disposed at a position sandwiched between the retainer 24 and the case body 25 of the airbag main body 56 and the reinforcing cloths 57 and 58. Thus, it is possible to protect at least a part including the extended portion 63a of the slit portion 63 and both end portions 66a and 66b of the second sewing portion 66 against the gas pressure (and temperature) of the inflator 22 during deployment. Damage to the gas of the inflator 22 can be suppressed. Therefore, it is possible to suppress so-called stitching in which the adjacent sewing holes of the second sewing portion 66 are continuous with each other due to damage to the gas, and the airbag main body 56, the reinforcing fabrics 57 and 58, and the rectifying fabric 59 caused by this stitching. In addition, it is possible to suppress a decrease in the holding strength of the retainer 24 due to the rupture of the wrapping member 26 and the like, and it is also possible to suppress a decrease in the rectification performance due to the rectification cloth 59 being broken.

  Furthermore, the end portion located on the extending portion 63a side from at least one end portion extending from the extending portion 63a of the intersecting portion 63b of the second sewing portion 66, in the present embodiment, both end portions 66a and 66b are provided. By being folded back, fraying at the positions of both end portions 66a and 66b of the second sewing portion 66 can be suppressed, the sewing strength can be further improved, and the retainer 24 can be retained (opening strength). The airbag 21 (the airbag main body 56 including the second sewing portion 66 and the extension portion 63a of the slit portion 63 and the reinforcing cloths 57 and 58) is positioned at both end portions 66a and 66b of the second sewing portion 66 by folding back. Since the thickness increases, the airbag body 56 and the reinforcing fabrics 57 and 58 can be more firmly sandwiched between the retainer 24 and the case body 25, and damage to the gas of the inflator 22 when the airbag 21 is deployed can be further suppressed. .

  Moreover, since the second sewing unit 66 can cope with this by changing the program of the existing sewing device and changing the shape, the existing sewing device 66 can be used without changing the design or using a separate new device. It can be easily applied to the bag 21.

  The first sewing portion 65 is positioned on the back side of the side wall portion 34 of the retainer 24 when viewed from the inflator 22 side, and the second sewing portion 66 is positioned below the bottom surface portion 33 of the retainer 24 (see FIG. 2 (a) and FIG. 2 (b)), the gas injected from the gas injection port 22c of the inflator 22 is not directly hit, and damage to the gas can be further suppressed.

  In the first embodiment described above, the gas inlet 61 is not limited to a circular shape, and may have an arbitrary shape such as a square shape as in the second embodiment shown in FIG. can do. In this case, by forming the first sewing portion and the second sewing portion in the same manner along the gas introduction port 61, it is possible to achieve the same operational effects as in the first embodiment.

  In addition, the second sewing portion 66 can achieve the same effects as long as at least a part thereof is positioned on the extension portion 63a side with respect to at least one end portion of the intersecting portion 63b. For example, both end sides of the second sewing portion 66 are folded back at positions extending from the both end portions of the intersecting portion 63b toward the extending portion 63a, and both end portions 66a66b are extended from the both end portions of the intersecting portion 63b to the opposite side to the extending portion 63a. You may do it.

  Further, the intersecting part 63b is formed so as to extend only in one side direction (or the other side direction), not in both side directions, as long as it extends in a direction intersecting (orthogonal) with respect to the extending part 63a. You can also. Even in this case, the same effect can be obtained by positioning at least a part of the second sewing portion 66 closer to the extending portion 63a than the end of the intersecting portion 63b.

  Further, if the extending portion 63a extends from the gas introduction port 61, the extension portion 63a is formed in a direction inclined with respect to this line even if it is not entirely located on a line passing through the central portion of the gas introduction port 61. You can also.

  Further, in each of the above embodiments, the airbag device 10 is for the passenger seat, but it can also be applied to the driver seat.

  The present invention can be applied to an airbag device for a passenger seat or a driver seat of an automobile, for example.

10 Airbag device
21 airbag
22 Inflator
24 Retainer as holding member
25 Case body
36 Positioning flange as positioning part
56 Airbag body
57, 58 Reinforcement cloth
61 Gas inlet
63 Slit
63a Extension
63b intersection
66 Second sewing part which is the sewing part
66a, 66b end

Claims (4)

A bag-like airbag main body having a gas introduction port into which an inflator is inserted and inflated and deployed by introducing gas into the interior of the case body from a state where the inflator is attached to the case body by a holding member together with the inflator and stored. When,
A reinforcing cloth that reinforces the outer edge of the gas inlet of the airbag body,
A slit portion formed by cutting the airbag main body portion and the reinforcing cloth continuously to the gas inlet;
A linear sewing part for sewing the reinforcing cloth and the airbag body part together along the outer edge part of the gas inlet;
The slit portion is
An extended portion that continues to the gas inlet and extends outward from the gas inlet;
It extends along the direction intersecting with the extension part at the tip of the extension part, and includes an intersection part through which a positioning positioning part protruding from the holding member is inserted,
The airbag according to claim 1, wherein at least a part of the sewing part is positioned on the extension part side of at least one end part extending from the extension part of the intersecting part. At least a part including an extended portion of the slit portion and a portion positioned on the side of the extending portion from at least one end portion extending from the extending portion of the intersecting portion of the sewing portion includes an airbag main body portion and The airbag according to claim 1, wherein the airbag is disposed at a position sandwiched between the holding member of the reinforcing cloth and the case body. The sewing part is positioned at the extension part side of at least one end part extending from the extension part of the intersecting part, and the end part is folded back and sewn. The airbag according to claim 1 or 2, wherein: An airbag according to any one of claims 1 to 3;
An inflator that is inserted into the gas inlet of the airbag body of the airbag and supplies gas into the airbag body;
A positioning member for positioning that is inserted into an intersection of the slits of the airbag, and a holding member that is positioned in the airbag body and holds the airbag body and the inflator;
An airbag device comprising: a case body in which the airbag body portion and the inflator are attached by the holding member and the folded airbag body portion is accommodated.

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