JP2010241295A - Airbag and airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a surrounding part of a gas inflow port have high resistance, while constituting an airbag by a single sheet of a cut part to reduce manufacturing cost. <P>SOLUTION: This airbag 1 is formed into a bag body including an upper wall part 4, two side wall parts 5 and 6, a lower wall part 3 and a contact wall part 2 by sewing the cut part 12. The single sheet of the cut part 12 is formed by making the lower wall part 3 as a right and left connecting wall part, dividing and forming each of the upper wall part 4 and the contact wall part 2 into two divided wall parts 2a, 2b, 4a and 4b along a center line CL in a right and left direction in the airbag 1 of an inflated and deployed state, continuously providing each of the side wall parts 5 and 6 in a right and left direction of the right and left connecting wall part and continuously providing each of the divided wall parts 2a, 2b, 4a and 4b around each of the side wall parts 5 and 6. In the lower wall part 3, the gas inflow port 10 is provided at a center position in the right and left direction in the airbag 1 of the inflated and deployed state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an airbag equipped on a vehicle such as an automobile and an airbag apparatus including the airbag.

  In general, an airbag device includes an airbag that catches the occupant's body and a gas generator that injects gas to inflate the airbag. One method of manufacturing an airbag used in such an airbag apparatus is to create an airbag as a bag body by stitching one cut part.

  In recent years, the shape of a cut part that can form the entire airbag in one piece so that the waste part (end material part) is not generated as much as possible when cutting such a cut part from the base fabric to reduce manufacturing costs. Has been proposed. (For example, refer to Patent Document 1).

International Publication WO94 / 18033

  However, in the above-described conventional technique, the sewing line intersects the edge of the gas inlet for allowing the compressed gas supplied from the inflator provided outside the airbag to flow into the airbag. The gas inlet and the surrounding area are particularly required to be resistant because a large load is applied when a large amount of compressed gas is suddenly introduced from the inflator and at the same time the entire airbag is fixed to the vehicle. It has become a part. In the future, there is a demand for an air bag composed of a single cut part so that the sewing line does not cross the edge of the gas inlet and has high resistance around the gas inlet.

  An object of the present invention is to provide an air bag and an air bag apparatus that have a high resistance in a peripheral portion of a gas inlet while being constituted by a single cut part for the purpose of reducing manufacturing costs.

  In order to achieve the above object, the first invention is an airbag formed in a bag body having an upper wall part, two side wall parts, a lower wall part, and a contact wall part by sewing a cut part. The cut part has the lower wall portion as a left and right connecting wall portion, and each of the upper wall portion and the contact wall portion is divided into two along a substantially center line in the left-right direction of the airbag in an inflated and deployed state. It is divided into wall portions, and the side wall portions are continuous in the left-right direction of the left and right connecting wall portions, and each of the divided wall portions is continuously formed around each side wall portion. The lower wall portion is provided with a gas inlet at a substantially central position in the left-right direction of the airbag in an inflated and deployed state.

  Thereby, in the unfolded state of the cut parts before sewing, the divided wall portions obtained by dividing the two side wall portions, the upper wall portion, and the contact wall portion around the lower wall portion that is the left and right connecting wall portions are substantially radial. It can be set as the arranged shape. For this reason, the air bag of a bag body can be created by forming one cut part with the shape close | similar to a rectangular shape as a whole without providing the extremely uneven | corrugated | grooved part, and sewing this. Therefore, by cutting the cut parts from the base fabric in an appropriate arrangement, the area of the base fabric after cutting can be reduced as much as possible, that is, more effective cut parts can be created with less base fabric. Therefore, the manufacturing cost per airbag can be reduced.

  Further, by providing the gas inlet at a substantially central position in the left-right direction of the lower wall portion that is not divided in the cut parts, a sewing line is not formed at the edge of the gas inlet. Even when a large amount of compressed gas is introduced rapidly, it has high resistance in the peripheral portion of the gas inlet.

  As a result, the airbag of the present invention can have high resistance in the peripheral portion of the gas inflow port while being constituted by one cut part for the purpose of reducing the manufacturing cost.

  In a second aspect based on the first aspect, the upper wall portion, the lower wall portion, and the contact wall portion are substantially along the left-right direction of the airbag in a state where adjacent wall portions are inflated and deployed. It is characterized in that it is sewn and joined with a sewn line in the left-right direction.

  As a result, the overall shape of the airbag in the inflated and deployed state can be adjusted by appropriately adjusting the length of the sewing line in the left-right direction, while the entire airbag has a structure that is overlapped in the left-right direction in most parts except the lower wall portion. A large width dimension in the left-right direction can be secured.

  A third invention is the above-described first or second invention, wherein the airbag is a passenger seat airbag installed in the passenger seat, and when the passenger seat airbag is installed in the vehicle and inflated. Is characterized in that the upper wall portion is curved in the front-rear direction and a part of the upper wall portion is in contact with the windshield.

  As a result, the inflated airbag is stably fixed in contact with the windshield, so that stable restraint on the occupant's body is possible.

  In order to achieve the above object, a fourth invention comprises the airbag according to any one of the first to third inventions, and a gas generator for inflating the airbag by injecting gas. And

  Thereby, the airbag apparatus having the effect of the airbag of the first invention can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, high resistance can be given to the surrounding part of a gas inflow port, comprising the airbag by one cut part in order to reduce manufacturing cost.

FIG. 3 is a schematic perspective view showing a state where the passenger seat airbag according to the embodiment of the present invention is inflated and deployed. It is an expanded view of the cut parts which form an airbag. It is a figure explaining the process of creating an airbag from cut parts. It is a side view which shows the state which installed the airbag apparatus using an airbag in the passenger seat of a vehicle, and was inflate-deployed. FIG. 3 is a partially enlarged view in the vicinity of four points A, B, C, and D in FIG. 2.

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

  FIG. 1 is a perspective view schematically showing a state in which an airbag according to an embodiment of the present invention is inflated and deployed. FIG. 1 (a) is a perspective view from the rear side, and FIG. 1 (b) is a front view. It is a perspective view from the side. In the following description, the front-rear direction, the up-down direction, and the left-right direction viewed from the occupant seated on the vehicle seat are used as words indicating the direction in the space. In addition, each sewing line in the drawing is represented by a dotted line, and a transparent contour line (or a lead line) is represented by a broken line coarser than the dotted line.

  1 (a) and 1 (b), the airbag 1 of the present embodiment is a passenger seat airbag installed in the passenger seat of the vehicle, which is opposed to the front of the occupant in the inflated and deployed state shown in the figure. And a contact wall portion 2 that contacts and restrains the body, a lower wall portion 3 located below the upper portion, an upper wall portion 4 located above the lower portion, and two side wall portions located on the left and right sides thereof. 5 and 6, and the overall shape is a substantially quadrangular pyramid shape with the contact wall portion 2 as a bottom surface. In the drawing, for convenience of distinguishing each of the wall portions 2, 3, 4, 5, and 6, each wall portion 2, 3, 4, 5, and 6 is represented by a plane, and each wall portion 2, 3 4, 4, 5, 6 are bent at a sharp angle, but in actuality, the walls 2, 3, 4, 5, 6 are gently swelled. Between 2, 3, 4, 5, and 6, it bends so that it may have roundness, and the airbag 1 whole becomes a shape close | similar to a spherical body rather than the polygonal shape shown in figure.

  The contact wall portion 2 and the upper wall portion 4 are divided into left and right divided wall portions 2a and 2b with respect to the center line CL in the left and right direction in the airbag 1 in an inflated and deployed state as shown in the drawing. , 4a, 4b, which are joined by a sewing line along the center line CL to form the contact wall portion 2 and the upper wall portion 4. Here, the two divided wall portions 2a and 2b constituting the contact wall portion 2 are referred to as divided contact wall portions 2a and 2b, and a sewing line for joining them together is referred to as a contact wall portion sewing line 2c, and an upper wall portion. The two divided wall portions 4a and 4b constituting 4 are referred to as divided upper wall portions 4a and 4b, and a sewing line that joins them is referred to as an upper wall sewing line 4c.

  Further, the contact wall portion 2, the lower wall portion 3, and the upper wall portion 4 are joined to each other by the left and right sewing lines 7, 8, 9 that are adjacent to each other along the substantially left-right direction. Here, a sewing line that joins the contact wall portion 2 and the upper wall portion 4 among the left and right direction sewing lines 7, 8, and 9 is referred to as an upper left and right direction sewing line 7, and the contact wall portion 2 and the lower wall portion 3 A sewing line that joins the upper wall portion 4 and the lower wall portion 3 is called a front left-right direction sewing line 9.

  Further, compressed gas is supplied from an inflator (described later) to the inside of the airbag 1 at the center position in the left-right direction on the front side of the lower wall portion 3 (the vehicle front side; the left rear side in FIG. 1A). A rectangular gas inlet 10 for inflow into the vehicle is provided, and the airbag 1 is inflated and deployed to the maximum at the two side walls 5 and 6 to release the gas to the outside air to restrain the occupant. A circular vent hole 11 is provided.

  Further, the upper wall portion 4 is curved and bulged so as to be folded in the outward direction at a substantially intermediate position in the front-rear direction due to its shape at the stage of cut parts (described later), The upper part (part) 4d across the bulging position is a surface arranged at an angle closer to the horizontal than the lower part 4e. The arrangement angle of the upper portion 4d is an angle at which the upper portion 4d can easily come into contact with the windshield of the vehicle as compared with the lower portion 4e.

  FIG. 2 is a development view of two cut parts forming the airbag 1 of the present embodiment. 2 corresponds to the forward direction (front of the vehicle) in FIG. 1, and the upward direction in FIG. 2 corresponds to the backward direction (rear of the vehicle) in FIG.

  As shown in FIG. 2, the main body of the airbag 1 of the present embodiment is formed by sewing one cut part 12. In this cut part 12, the lower wall part 3 is arranged in the center, the side wall parts 5 and 6 are connected in the left and right direction, respectively, and the divided contact wall parts 2a and 2b around the side wall parts 5 and 6, respectively. The divided upper wall portions 4a and 4b are connected. From this arrangement, the lower wall portion 3 connects the side wall portions 5 and 6 and the respective divided wall portions 2a, 2b, 4a, and 4b in the left and right directions, so that the lower wall portion 3 serves as a left and right connecting wall portion. It is functioning. 2 is a boundary line between the wall portions 3, 5, 6 or the divided wall portions 2a, 2b, 4a, 4b, and the airbag 1 is inflated and deployed. Then, each wall part 2,3,4,5,6 will bend along this boundary line.

  The shape of the edge portion 4c ′ to be sewn by the upper wall portion sewing line 4c among the outer peripheral edge portions of the respective divided upper wall portions 4a and 4b at the stage of the cut part 12 is at a substantially intermediate position in the longitudinal direction. It has a curved shape that bulges outward. For this reason, in the state in which the airbag 1 formed by sewing these edge portions 4c ′ is inflated and deployed (see FIG. 1), as described above, it is outward at a substantially intermediate position in the front-rear direction of the upper wall portion 4. It turns like a mountain fold and bulges in a curved manner.

FIG. 3 is a diagram illustrating a process of creating the airbag 1 from the cut part 12.
First, as shown in FIG. 3A, reinforcing cloths 21, 22, and 23 are sewn and provided around the vent hole 11 of the cut part 12 and the gas inlet 10. In particular, since the peripheral portion of the gas inlet 10 is a portion for fixing the airbag 1 to the vehicle, two large and small reinforcing cloths 21 and 22 are provided in an overlapping manner. In FIGS. 1 and 2, the reinforcing cloths 21, 22 and 23 are not shown in order to avoid the complexity of the illustration.

  Next, as shown in FIG. 3B, the cut parts 12 are folded and overlapped along the center line CL shown in FIG. Then, the two divided upper wall portions 4a and 4b that are overlapped are sewn together by an upper wall portion sewing line 4c along the edge portion, and are integrally formed. Further, the two divided contact wall portions 2a and 2b that are overlapped are sewn together by a contact wall portion sewing line 2c along the edge portion to be integrally formed.

  Next, as shown in FIG. 3C, the shapes of the contact wall portion 2 and the upper wall portion 4 are overlapped with each other by applying a suitable shape at a predetermined fold line (not shown in particular), and contact is made. The edges of the wall 2 and the lower wall 3 that are close to each other are overlapped. The contact wall portion 2 and the upper wall portion 4 are sewn together at the upper left and right direction sewing line 7 along the edge, and the contact wall portion 2 and the lower wall portion 3 are joined to each other along the edge. Sewing with the sewing line 8 and joining.

  Then, the airbag 1 in this state is turned over through the opening between the upper wall portion 4 and the lower wall portion 3 so that the inner surface and the outer surface are turned over and positioned in the vicinity of the sewing lines 2c, 4c, 7, 8, and 9. After the partition walls 2a, 2b, 4a, 4b and the edges of the lower wall 3 are arranged on the inner surface of the airbag 1, a predetermined fold line (particularly not shown) is shown in FIG. And the edges of the upper wall portion 4 and the lower wall portion 3 that are close to each other are overlapped. Then, the upper wall portion 4 and the lower wall portion 3 are joined together by sewing with a front left and right sewing line 9 along the edge. Thereby, the air bag 1 with high airtightness can be formed more simply.

  FIG. 4 is a side view schematically showing a state in which the airbag apparatus using the airbag 1 of the present embodiment is installed in the passenger seat of the vehicle and inflated and deployed.

  In FIG. 4, the airbag 1 has an inflator 101 as a compressed gas generator fixed at a gas inlet 10, and the inflator 101 is further fixed to an instrument panel 201 positioned in front of a passenger seat of a vehicle. ing. Here, the airbag 1 and the inflator 101 constitute the airbag device 100.

  Although not particularly shown, the airbag 1 is normally housed inside the instrument panel 201 as an airbag module, and is supplied with compressed gas from the inflator 101 via a gas inlet 10 when a vehicle collides. It flows into the interior of the airbag 1. As a result, the airbag 1 is inflated by the pressure of the compressed gas and is deployed in front of the occupant M seated in the passenger seat. And the contact wall part 2 expand | deploys facing the passenger | crew's M body, and restrains the passenger | crew M. FIG. At this time, when the inflated airbag 1 is properly disposed in the vehicle interior, the upper wall portion 4 comes into contact with the surface of the windshield 202 over a wide area, and the airbag 1 is easily fixed.

  In the above, the airbag 1 and the inflator 101 constitute the airbag device 100.

  According to the airbag 1 of the present embodiment having the configuration described above, the following effects can be obtained.

  That is, in the airbag 1 of the present embodiment, in the deployed state of the cut parts 12 before sewing, the two side wall portions 5 and 6 and the upper wall portion 4 are centered on the lower wall portion 3 that is the left and right connecting wall portion. In addition, the divided wall portions 2a, 2b, 4a, and 4b obtained by dividing the contact wall portion 2 can be formed in a substantially radially arranged shape. For this reason, the airbag 1 of a bag body can be created by forming one cut part 12 in a shape close to a rectangular shape as a whole without providing extremely uneven portions and sewing the cut part 12. Therefore, by cutting out the cut parts 12 from the base cloth in an appropriate arrangement, the area of the base cloth after cutting can be reduced as much as possible, that is, more effective cut parts 12 can be created with less base cloth. Therefore, the manufacturing cost per airbag can be reduced.

  Further, by providing the gas inlet 10 at a substantially central position in the left-right direction of the lower wall portion 3 that is not divided in the cut part 12, a sewing line is formed at the edge of the gas inlet 10. Even when a large amount of compressed gas is abruptly flown, it has high resistance in the peripheral portion of the gas inlet 10.

  As a result, the airbag 1 of the present invention can be provided with high resistance in the peripheral portion of the gas inlet 10 while being configured with one cut part 12 for the purpose of reducing the manufacturing cost.

  Further, in the present embodiment, the airbag 1 as a whole is structured so as to be overlapped in the left-right direction in most parts except the lower wall portion 3 (see FIG. 1), but the left-right direction sewing lines 7, 8, 9 By appropriately adjusting the length, it is possible to ensure a large width dimension in the left-right direction in the overall shape of the inflated airbag 1.

  In the present embodiment, the airbag 1 is a passenger seat airbag installed in the passenger seat. When the passenger seat airbag is installed in the vehicle and inflated, the upper wall 4 Is curved in the front-rear direction and part of the airbag 1 is in contact with the windshield 202, so that the inflated airbag 1 is in contact with the windshield 202 and is stably fixed. Stable restraint on the body of the occupant M is possible.

  As described above, the formation of the bulging portion of the upper wall portion 4 is caused by the shape of the edge portion 4c ′ of the divided upper wall portions 4a and 4b at the stage of the cut part 12, but this edge portion 4c. The shape of ′ is not limited to the shape shown in FIG. For example, FIG. 5 is a partially enlarged view in the vicinity of the four points A, B, C, and D in FIG. 2. The shape of the edge 4c ′ connecting the two points C and D in FIG. Other shapes as shown may be used. Also, the boundary lines between the divided upper wall portions 4a and 4b and the side wall portions 5 and 6 may be set as a straight line connecting two points A and B as shown by a one-dot chain line in FIG.

  Moreover, the cut parts 12 cut out each wall part 3,5,6 and each division | segmentation wall part 2a, 2b, 4a, 4b from the base fabric by the combination of each separately or adjacently, and these are each described above. It may be formed integrally by sewing on the boundary line shown in FIG.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention.

1 Airbag (passenger seat airbag)
2 contact wall 2a, 2b split contact wall (split wall)
2c Contact Wall Sewing Line 3 Lower Wall 4 Upper Wall 4a, 4b Divided Upper Wall (Divided Wall)
4c Upper wall sewing line 4d Upper wall upper part (part)
4e Lower part of upper wall part 5, 6 Side wall part 7 Upper left and right direction sewing line (left and right direction sewing line)
8 Rear left and right direction sewing line (left and right direction sewing line)
9 Front left / right direction sewing line (left / right direction sewing line)
DESCRIPTION OF SYMBOLS 10 Gas inlet 11 Vent hole 12 Cut parts 21, 22, 23 Reinforcement cloth 100 Airbag apparatus 101 Inflator (gas generator)
201 Instrument panel 202 Windshield M Crew

Claims (4)

An airbag formed in a bag body having a top wall portion, two side wall portions, a lower wall portion, and a contact wall portion by sewing cut parts,
The cut parts are
The lower wall portion is a left and right connecting wall portion, and each of the upper wall portion and the contact wall portion is divided into two divided wall portions along a substantially central line in the left-right direction of the airbag in an inflated and deployed state. Formed, the side wall portions are continuous in the left-right direction of the left and right connecting wall portions, and further, each of the divided wall portions is formed in a single piece around each of the side wall portions,
The airbag, wherein the lower wall portion is provided with a gas inlet at a substantially central position in the left-right direction of the airbag in an inflated and deployed state. The upper wall portion, the lower wall portion, and the contact wall portion are sewn and joined by a left-right direction sewing line substantially along the left-right direction of the airbag in a state where adjacent wall portions are inflated and deployed. The airbag according to claim 1, wherein The airbag is a passenger seat airbag installed in the passenger seat;
When the passenger airbag is installed in the vehicle and inflated and deployed, the upper wall portion is curved in the front-rear direction, and a part thereof is in contact with the windshield. The airbag according to claim 1 or 2. The airbag according to any one of claims 1 to 3,
An air bag apparatus comprising: a gas generator that injects gas to inflate the air bag.

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