JP5399873B2 - Airbag - Google Patents

Description

  The present invention relates to an airbag that protects an occupant when a vehicle such as an automobile collides, and more particularly to an airbag for a curtain airbag device that inflates and deploys along a side surface in a vehicle compartment.

  This type of airbag is known as a so-called curtain airbag that is deployed along a side surface in a vehicle cabin by introducing and inflating an inflation gas.

  Such a curtain-type airbag is inflated and deployed, for example, downward from the vehicle body along a side surface (for example, a door or a pillar) in a vehicle compartment from a folded housing state when the vehicle receives a side collision or rolls over. In addition to protecting the occupant's head and the like, the occupant is held in the vehicle compartment.

  Therefore, the curtain-type airbag has a bag body in which a base fabric made of nylon or the like is formed in a bag shape, and the bag body is inflated and deployed by introducing inflation gas into the bag. It has become.

  For this reason, the curtain airbag is inflated and deployed by an inflator that generates inflation gas, and has a gas introduction port for introducing inflation gas from the inflator.

  The gas inlet is formed by, for example, extending a part of a pair of base fabrics constituting the bag body, and after fitting the inflator, the outside is tightened using a tightening member. To connect to.

  The gas inlet has been conventionally installed on the rear end side of the vehicle body in the bag body. Recently, in order to ensure the speed of expansion and deployment of the bag body, the vicinity of the vehicle body central portion in the bag body ( What is installed in the peripheral part where the center pillar of the vehicle body exists has come to be implemented (see, for example, Patent Document 1 or Patent Document 2).

  The following technique is known as a specific example in which the gas inlet is externally fitted to the inflator and connected using a fastening member (see Patent Document 3).

  According to the technology described in Patent Document 3, the vicinity of the gas inlet of the airbag is fitted around the inflator, and is tightened at positions separated from each other by two bands (or rods) as a tightening member. The gas inlet is tightened by the saddle band of the holder together with the inflator, and is attached to the vehicle body together with the inflator by attaching the holder to the vehicle body.

  And, in order to prevent the gas introduction port from coming out of the fastening member by increasing the connection strength between the gas introduction port and the inflator, such a technique forms a perforation that protrudes from the surface of the gas introduction port, In addition to the band, a rod-like body is provided in a curved state to tighten the gas inlet.

JP 2005-178606 A JP 2005-178612 A JP 2000-85510 A

  However, in order to fit the inflator, the gas inlet must set the inner hole dimension to a dimension that allows the inflator to be smoothly fitted. For this purpose, the band or rod-like body after the inflator is fitted When tightening with a tightening member consisting of, the base fabric loosens, and in order to obtain a predetermined tightening force on the inflator, a complicated work for skillfully handling the slack is necessary, and there is no leakage of inflation gas So that it is not easy to connect.

  Furthermore, in the technique described in Patent Document 3, a holder is used to mount the inflator together with the airbag to the vehicle body, and a configuration is adopted in which a saddle band is wound around the holder. The structure has also become a cause of increasing the size and weight of the entire airbag device.

  Therefore, in the conventional airbag device, the saddle band as described above is abolished, a mounting member such as a bolt is implanted on the inflator side, and the mounting member is provided on the side wall of the gas inlet. It is known that it is attached to the vehicle body in a state of protruding from the vehicle.

  However, in such a conventional technique, as a result of implanting a mounting member such as a bolt on the inflator, in order to externally fit the gas introducing port to the inflator, the inner hole size of the gas introducing port is set to be larger than the mounting member. There is a need.

  As a result, the base fabric of the gas introduction port fitted with the inflator is loosened largely around the inflator because the mounting member protrudes from the inner hole. The process of processing the slack portion well becomes more complicated.

  Therefore, in view of the problems in the conventional technology, the present invention enables attachment to a vehicle body using an attachment member such as a bolt installed in an inflator, and achieves downsizing and weight reduction of an airbag device. Even if the base fabric at the gas outlet that fits the inflator becomes bulky, the vehicle is configured to reliably prevent the expansion of the base fabric and prevent the expansion gas from leaking from the tightening member. The purpose is to provide an air bag.

  An airbag according to the present invention has a bag body that protects an occupant by introducing and inflating an inflation gas, and a gas introduction port that introduces the inflation gas discharged from the inflator into the bag body. The gas inlet is formed in a cylindrical shape and is externally fitted to the inflator and is configured to connect the gas inlet to the inflator by fastening with a fastening member from the outside of the gas inlet. In the bag, a tab piece is formed by extending a part of the base fabric constituting the gas introduction port into a narrow band at a portion closer to the bag body side than the portion where the fastening member is disposed in the gas introduction port. The gas inlet is formed by wrapping the gas inlet to the outside of the gas inlet with the inflator fitted over the tab piece. Characterized by being configured tightened to diameter to aerator side.

  In the present invention having such a configuration, even if the base fabric constituting the gas introduction port becomes bulky after the inflator is externally fitted, the tab piece formed by extending the base fabric is formed outside the gas introduction port. Since the gas introduction port is tightened so that the diameter of the gas introduction port is reduced toward the inflator side, even if a predetermined amount of tightening force by the fastening member cannot be obtained, the base fabric constituting the gas introduction port can be released from the fastening member. It can be easily prevented from leaking inflation gas, and an attachment member in which the inflator is mounted on the inflator together with the bag body can be used. Thus, the airbag device can be reduced in size and weight.

  Further, according to the present invention, as an embodiment of the above invention, a mounting member for a vehicle body is provided on the inflator, and the mounting member protrudes outward from a through hole formed in the gas introduction port. By fitting a hooking hole provided at the tip of the tab piece into the protruding portion, the reduced diameter tightening state of the tab piece with respect to the gas inlet is maintained.

  In such a configuration, by providing the inflator with an attachment member to the vehicle body, the airbag device can be reduced in size and weight, and as a result of this configuration, the base fabric of the gas outlet that fits the inflator is bulky. Even after the dove piece formed on the base fabric reduces the diameter of the gas introduction port, the hook hole is fitted to the mounting member and maintains the reduced diameter tightening state. The constituent base fabric does not bounce from the fastening member, and it does not profit or protrude, so that the leakage of the expansion gas can be easily prevented.

  Further, according to the present invention, as an embodiment of the above invention, the gas introduction port forms a pair of base fabrics constituting the bag body so as to extend along the axial direction of the inflator and the extension portions Each of the edge portions is stitched, and one of the two edge portions is extended to form the tab piece.

  With such a configuration, the tab piece can be formed at the same time as the base fabric is formed by forming the tab piece at the edge of the extending portion of the base fabric constituting the gas inlet, and at the time of forming the base fabric. It can be composed of an end cloth portion that is cut off, and does not cause an increase in the manufacturing cost of the airbag.

  Moreover, this invention is comprised so that the said tab piece may be wound around the outer side of the said gas inlet in the state which wound up the said other edge part as embodiment of the said invention.

  With such a configuration, the configuration of tightening the gas introduction port by the tab piece can be further ensured by winding the outside of the gas introduction port with the tab piece wound around the other edge.

  In the present invention, even if the base fabric constituting the gas introduction port becomes bulky after the inflator is fitted, the tab piece formed by extending the base fabric is wound around the outside of the gas introduction port. Since the gas introduction port is tightened to reduce the diameter to the inflator side, even if a predetermined amount of tightening force by the tightening member cannot be obtained, the base fabric that constitutes the gas introduction port does not flip from the tightening member. In addition, it can be prevented from overflowing and can be easily prevented from leaking inflation gas, and an attachment member in which the inflator mounting structure for the inflator is installed in the inflator together with the bag body can be used. The airbag device can be reduced in size and weight.

It is the perspective view drawn simply in the state which developed the airbag as a curtain airbag which employ | adopted the Example which concerns on this invention. FIG. 2 is an exploded perspective view illustrating an enlarged vicinity of a gas introduction port in FIG. 1. FIG. 2 is an assembly explanatory diagram illustrating a state in which an inflator is fitted to the gas introduction port in FIG. 1. FIG. 4 is an assembly explanatory diagram illustrating a state in which the other edge portion of the base fabric constituting the gas inlet is folded from the state of FIG. 3. From the state of FIG. 4, wrap a tab piece extending on one edge of the base fabric constituting the gas inlet port around the outside of the gas inlet port, and fit the mounting member into the hook hole formed at the tip of the tab piece It is an assembly explanatory drawing which drawn the state where the diameter reduction tightening state to the gas inlet by a tab piece was held by doing. FIG. 6 is an explanatory diagram in which a vehicle body mounting bracket for mounting an inflator to the vehicle body is attached to the gas inlet from the state of FIG. 5 and a state in which the airbag module is completed is drawn together with the folded bag body. It is AA sectional drawing of FIG. It is sectional drawing similar to FIG. 7 in the other Example which concerns on this invention.

  The airbag according to the present invention enables attachment to a vehicle body using an attachment member such as a bolt installed in an inflator, thereby reducing the size and weight of the airbag device, and also includes a gas in which the inflator is externally fitted. Even if the base fabric of the jet outlet becomes bulky, the base fabric is configured to be able to prevent the expansion gas from leaking and to prevent the leakage of the inflation gas by reliably suppressing the base fabric from bouncing or protruding from the fastening member.

  Next, the Example employ | adopted as the curtain airbag made to cover the side part opening of a vehicle as an airbag of this invention is described using figures.

  First, in FIG. 1, an airbag 1 as a curtain airbag according to the present invention includes outer peripheral peripheral portions of base fabrics 2 and 3 having substantially the same shape that constitute a pair of surfaces facing the vehicle interior side and the vehicle interior, respectively. It has a bag body 4 as an inflatable portion formed into a bag shape by sewing, has a long dimension in the longitudinal direction of the vehicle compartment, and is folded in a roof side portion (vehicle It is arranged along the boundary between the ceiling surface and the side surface in the room. At this time, the airbag 1 has the left side in FIG. 1 on the vehicle front side and the right side on the vehicle rear side.

  A gas introduction port 5 is provided in the central portion of the bag body 4 in the longitudinal direction by extending the base fabrics 2 and 3.

  The gas inlet 5 extends toward the rear side of the vehicle after facing upward at one end, and is configured by sewing a pair of upper and lower edge portions 6 and 7 formed by the extended base fabrics 2 and 3, respectively. The rear end portion is opened so that the inflator 8 can be inserted, and the inserted inflator 8 is externally fitted. Accordingly, both edge portions 6 and 7 of the gas inlet 5 are arranged along the axial direction of the inflator 8. A tab piece 11 is formed on one edge portion 6 (an edge portion extending to the lower side of the gas inlet 5) by extending a part of the base fabrics 2 and 3 in a narrow strip shape.

  The tab piece 11 is disposed at a portion closer to the bag body 4 side with respect to the axial direction of the inflator 8 than a portion where the band 12 that is a fastening member at the gas introduction port is disposed.

  The band 12 is configured to connect the inflator 8 to the gas introduction port 5 by tightening the outside of the rear end of the gas introduction port 5 after the inflator 8 is fitted.

  Bolts 9 as a pair of attachment members for attaching the inflator 8 to the vehicle body are planted on the upper portion of the inflator 8 in a state of being separated from each other. When the inflator 8 is inserted into the gas inlet 5, the bolt 9 faces through holes 5 a and 5 a formed in the middle of the longitudinal direction of the gas inlet 5 (the state shown in FIG. 3), and further outward. It protrudes (see the state of FIG. 4).

  And it is necessary for the gas inlet 5 to be configured so that the bolt 9 erected on the inflator 8 together with the inflator 8 can be inserted simultaneously from the rear end opening 5b. Therefore, in the state shown in FIG. Therefore, it has a slack portion 5c with respect to the diameter of the inflator 8. The other edge 7 of the gas inlet is folded in the opposite direction with respect to the bolt 9.

  Next, as shown in FIG. 5, the tab piece 11 formed on one edge portion 6 with the bolt 9 protruding from the through holes 5 a and 5 a of the gas introduction port 5 is folded in advance. Is wound around the outside of the gas inlet 5, and the hook hole 11a provided at the tip of the tab piece is fitted into the protruding portion of the bolt 9 on the rear end side, thereby The reduced diameter tightening state with respect to the introduction port 5 is maintained (see the state shown in FIG. 7).

  Next, as shown in FIG. 6, the air bag 1 is modularized by inserting the bolt 9 through the mounting hole 10c of the mounting piece 10b formed protruding from the bracket body 10a of the vehicle body mounting bracket 10 and tightening with a nut (not shown). Thus, the inflator 8 is mounted on the vehicle body together with the gas inlet 5 by screwing a bolt (not shown) to the vehicle body using the mounting piece 10e.

As shown in FIG. 6, the airbag 1 has a plurality of attachment tongues 4a formed by extending a part of the base fabrics 2 and 3 on the outer extension of the bag body 4 and hooking it on the roof side. It is designed to be mounted on the vehicle body in a folded state.

  In such a configuration, even if the base fabrics 2 and 3 constituting the gas introduction port 5 become bulky due to the slack portion 5c after the inflator 8 is externally fitted, the tabs formed by extending the base fabrics 2 and 3 are formed. Since the piece 11 is wound around the outside of the gas inlet 5 and tightened so that the diameter of the gas inlet 5 is reduced toward the inflator 8, the slack portion 5 c is bundled and expanded on the downstream side of the band 12 in the gas flow direction. Even if the band 12 is comparatively light and simple, it is possible to suppress the opening and reduce the load applied to the band 12. The displacement of the band 12 is also suppressed, and the leakage of the inflation gas can be easily prevented. In addition, the base fabrics 2 and 3 that constitute the gas inlet 5 to the single body of the inflator 8 together with the bag body 4 are the bands. 2 and it can be prevented from leaking inflated gas completely, and the inflator 8 and the inflator 8 can be mounted on the inflator 8 together with the bag body 4. The bolt 9 can be used, and the airbag device can be reduced in size and weight.

Further, the tab piece 11 can be formed simultaneously with the molding of the base fabrics 2 and 3 by forming the tab pieces 11 on one edge portion 6 in the extending portion of the base fabrics 2 and 3 constituting the gas introduction port 5. In addition, it can be constituted by an end cloth portion that is cut off when the base fabrics 2 and 3 are formed, and does not cause an increase in manufacturing cost of the airbag.

Furthermore, by tightening the outer side of the gas introduction port 5 with the tab piece 11 entraining the other edge portion 7, the tightening configuration of the gas introduction port 5 by the tab piece 11 can be further ensured.

  FIG. 8 shows another embodiment according to the present invention. As is clear from the configuration shown in FIG. 7, the tab piece 11 wraps around the other edge portion 7 together with the slack portion 5 c of the gas inlet 5. Although the bolt 9 is fitted in the hooking hole 11a of the tab piece 11 after the inflator 8 is externally fitted in a non-direction, the same effect as in the above embodiment is obtained although it differs from the configuration of the above embodiment. Is.

  In the above embodiment, the inflator itself is inserted into the gas inlet, but the gas generator of the inflator is arranged outside the airbag, and the gas generator and the gas inlet are connected by a pipe such as a steel pipe. You may make it connect. The present invention can be applied to such a conduit in the mounting relationship with the gas inlet, and in such a case, the inflator is understood to include such a conduit.

  As described above, according to the present invention, even if the base fabric constituting the gas introduction port becomes bulky after the inflator is fitted, the tab piece formed by extending the base fabric has the gas introduction port. Since the gas inlet port is tightened so that the diameter of the gas inlet is reduced toward the inflator side, the leakage of the inflation gas can be easily prevented, and the structure of mounting the inflator to the vehicle body together with the bag body is provided. The attachment member planted in the inflator can be used, and the airbag device can be reduced in size and weight.

  For this reason, it can be said that the present invention is suitable for an airbag that protects an occupant when a vehicle such as an automobile collides, particularly an airbag for a curtain airbag device that inflates and deploys along a side surface of a vehicle interior.

DESCRIPTION OF SYMBOLS 1 Air bag 2, 3 Base fabric 4 Bag main body 5 Gas inlet 6 One edge part 7 The other edge part 8 Inflator 9 Bolt (attachment member)
11 Tab piece 11a Hook hole 12 Band

Claims (4)

  A bag body for protecting an occupant by introducing and inflating an inflation gas, and a gas introduction port for introducing the inflation gas discharged from an inflator into the bag body, the gas introduction port Is formed in a cylindrical shape and is fitted on the inflator and is tightened by a tightening member from the outside of the gas introduction port to connect the gas introduction port to the inflator. A tab piece is formed by extending a part of the base fabric constituting the gas introduction port in a narrow strip shape at a portion closer to the bag body side than the portion where the fastening member is disposed, By wrapping around the outside of the gas inlet with the inflator fitted, the diameter of the gas inlet is reduced toward the inflator. Air bag, characterized in that it has been tightened configuration.   A mounting member for the vehicle body is provided in the inflator, the mounting member is protruded outward from a through hole formed in the gas introduction port, and is provided at a tip portion of the tab piece at a protruding portion of the mounting member. 2. The airbag according to claim 1, wherein the air bag is configured to hold a reduced diameter tightening state of the tab piece with respect to the gas introduction port by fitting a hooking hole.   The gas introduction port is configured by forming a pair of base fabrics constituting the bag body so as to extend along the axial direction of the inflator and stitching the edge portions of the extension portions respectively. The airbag according to claim 1 or 2, wherein the tab piece is formed by extending one of the two edge portions.   The airbag according to claim 3, wherein the tab piece is wound around the outside of the gas introduction port in a state where the other edge portion is wound.

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