JP2016084108A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a proper expansion direction of an air bag.SOLUTION: An air bag 1 configured in such a manner that sides E1 to E6 of a first backing material part 1a and a second backing material part 1b which have a substantially pyramid-like outline shape, in which the first backing material part 1a has a bottom surface 20 relative to the second backing material part or said first backing material part, and an opening formed by the sides E1 to E6. In a transition from a folding state to an expansion state, the bottom surface 20 of the first backing material part is rotated on a same axis and at a prescribed angle with respect to a bottom surface 30 of the second backing material part.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an airbag used for transportation equipment such as an automobile.

  In automobiles, an air bag device is provided on a steering or dashboard in front of a seat to protect a driver and an occupant.

  Fig.7 (a) is a top view which shows the structure of the airbag in the conventional airbag apparatus. As shown in the figure, the airbag 100 is made of a material made of cloth such as nylon, and is provided with a first base cloth 101 having an inflator mounting port 103 and a vent hole 104 and having a bowl-shaped substantially circular shape, It consists of a second base cloth 102 having substantially the same dimensions and shape as the base cloth 101, and is formed into a bag shape by sewing a peripheral portion indicated by a broken line in the figure (Patent Document 1, FIG. 1). Or patent document 2, FIG. 2).

  For example, as shown in FIG. 7B, such an airbag is folded and stored in a case at the center of the steering 200 located in front of the driver's seat. Is expanded and deployed by the gas introduced through the inflator mounting port 103 from the center, and is symmetric about the central axis of the first base fabric 101 or the second base fabric 102 (substantially coincides with the rotation axis of the steering 200) The ellipsoid is shaped to protect the driver from impacts.

JP 2010-064506 A Japanese Patent No. 3875995

  However, the conventional airbag has the following problems. In other words, in order to enhance the protection performance, it is desirable that the airbag 100 is inflated in a direction that is large along the rotation axis of the steering 200 or the direction in which the steering 200 and the driver face each other. ), The airbag 100 has an ellipsoidal shape composed of a first base cloth 101 and a second base cloth 102 having substantially the same shape and dimensions, and therefore, the lateral direction orthogonal to the above-described direction is used. It tends to spread in the direction, that is, the surface direction of the first base fabric 101 or the second base fabric 102.

  In order to obtain the desired protection performance in such a conventional airbag 100, it is necessary to increase the amount of gas introduced into the bag, which leads to an increase in the size of the entire airbag apparatus including the inflator, It cannot be said that it is suitable for in-vehicle use.

  This invention is made | formed in view of said subject, and aims at providing the airbag which can optimize an inflating direction.

  In order to achieve the above object, at least one of the first side surfaces of the present invention is obtained by joining the peripheral edges of the first base material portion and the second base material portion, each of which has a substantially frustum-shaped bowl shape. And at least one of the first base material portion and the second base material portion includes a bottom surface and an opening facing the second base material portion or the first base material portion. In the transition from the folded state to the expanded state, the bottom surface of the first base material part or the second base material part is in relation to the second base material part or the first base material part. An airbag that rotates at a predetermined angle on the same axis.

  In addition, as another aspect of the present invention, the first base portion has a substantially polygonal truncated pyramid shape in which the bottom surface and the opening are similar in shape, The bottom surface and the opposite sides of the opening may be non-parallel.

  Further, according to another aspect of the present invention, in the folded state, the first base material portion has one side surface adjacent to a part of the other side surface, and the overlapping direction is along the circumference of the bottom surface. May be the same.

  The present invention as described above has an effect that the expansion direction can be optimized.

The expanded view which shows the structure of a part of airbag which concerns on embodiment of this invention The top view which shows the structure of a part of airbag which concerns on embodiment of this invention The perspective view which shows the three-dimensional state of the airbag which concerns on embodiment of this invention (A) Top view which shows the folding state of the airbag which concerns on embodiment of this invention (b) Sectional drawing which shows the structure of an airbag apparatus typically The figure which shows the use condition of the airbag which concerns on embodiment of this invention The figure for demonstrating the airbag of this invention (A) The top view which shows the structure of the conventional airbag (b) The figure which shows the use condition of the conventional airbag

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

  FIG. 1 is a plan view showing a configuration of a first base material portion which is a main portion of an airbag according to an embodiment of the present invention, and FIG. 2 is a second base which is a main portion of the airbag. It is a top view which shows the structure of a material part.

  As shown in FIG. 1, the first base material portion 1a in the airbag 1 is a member obtained by cutting out a single piece of woven fabric made of nylon or the like into a predetermined shape. Although shown as a development view, a substantially hexagonal truncated pyramid shape having all the side surfaces 10 and the bottom surface 20 is provided through a processing step described later.

  That is, all the side surfaces 10 are relative to the side connecting the vertices C1 and C2 of the bottom surface 20 and the side connecting the vertices C2 and C3 of the bottom surface 20 with the bottom surface 20 having a regular hexagonal shape as one bottom surface. Side E2, the side E3 facing the side connecting the vertices C3 and C4 of the bottom surface 20, the side E4 facing the side connecting the vertices C4 and C5 of the bottom surface 20, and the side facing the side connecting the vertices C5 and C6 of the bottom surface 20 E5 and a side E6 opposite to the side connecting the vertices C6 and C1 of the bottom surface 20 are provided as the contour on the other bottom surface.

  Then, the entire side surface 10 is a side surface 10x1 that is a quadrangle having one side of the bottom surface 20 and the side E1 as opposite sides, and the side surface 10x2 that has the same shape as the side surface 10x1 and that has one side of the bottom surface 20 and the side E2 as opposite sides. Side surface 10x3 having one side of bottom surface 20 and side E3 as opposite sides, side surface 10x4 having one side of bottom surface 20 and side E4 as opposite sides, side surface 10x5 having one side of bottom surface 20 and side E5 as opposite sides, and one side of bottom surface 20 And side 10x6 having side E6 and opposite side.

  Further, a seam allowance portion 10a and a seam allowance portion 20a are provided on the side connecting the vertices C1 to C6 of the entire side surface 10 and on each side of the bottom surface 20, and the apex C10 of the entire side surface 10 and the apex of the plane 20 A seam allowance 10b1 and a seam allowance 10b2 are also provided on the side connecting C1. By stitching the seam allowance part 10a and the seam allowance part 20a, and further stitching the seam allowance part 10b1 and the seam allowance part 10b2, the first base material part 1a has the bottom face 20 as the bottom face, and the sides E1 to E6 of the entire side face 10. Completes a generally hexagonal frustum-shaped shape having an opening with a hexagonal outline.

  However, in each of the side surfaces 10x1 to 10x6 constituting the entire side surface 10, the sides E1 to E6 that are opposite to the sides of the bottom surface 20 are respectively inclined with respect to the sides of the bottom surface 20, that is, arranged to be non-parallel. Therefore, the openings formed by the bottom surface 20 and the sides E1 to E6 are also skewed.

  On the bottom surface 20, an inflator mounting port 21 for mounting an inflator of an airbag device described later and a mounting hole 22 for mounting and fixing the airbag 1 to the airbag device are provided as through holes. . Further, vent holes 12 are provided as through-holes on the side surfaces 10x3 and 10x5 on all side surfaces 10, respectively.

  Next, as shown in FIG. 2, the second base material portion 1b in the airbag 1 is made of the same material as that of the first base material portion 1a, and the side E1 of the entire side surface 10 of the first base material portion 1a. It is a flat member cut out corresponding to the hexagonal outline which -E6 comprises.

  That is, the 2nd base material part 1b has the bottom face 30 whose planar shape is a regular hexagon, vertex C10-C60 and edge | sides E1-E6 of all the side surfaces 10 of the 1st base material part 1a, and 2nd base. The apex C10 to C60 and the sides E1 to E6 of the material part 1b are sewn in correspondence with each other, thereby closing the opening of the first base part 1a and completing the airbag 1 as a bag body.

  Furthermore, as shown in FIG. 1, in the airbag 1, in each of the six side surfaces 10x1 to 10x6 constituting all the side surfaces 10 of the first base material portion 1a, sides connecting the bottom surface 20 and the vertices C10 to C60, respectively. Is folded as a mountain fold line MF (solid line with black circles in the figure), and a diagonal line traversing the quadrilateral as a valley fold line VF (black with broken lines in the figure).

  Specifically, taking the side surface 10x2 as an example, a straight line connecting the vertex C2 of the bottom surface 20 that is the boundary between the adjacent side surface 10x2 and the side surface 10x1 and the vertex C20 of all the side surfaces 10 is a mountain fold line MF, and the vertex C3 of the bottom surface 20 And the diagonal line connecting the vertices C20 of the entire side surface 10 as a valley fold line VF, the boundary between the side surface 10x2 and the side surface 10x1 is bent in a mountain fold, and the side surface 10x2 is bent in a valley fold on the diagonal line. Similarly, with respect to the other side surfaces 10x1 and 10x3 to 10x6 constituting the entire side surface 10, the boundary of the side surface is bent in a mountain fold, and each side surface is bent in a valley fold along a diagonal line.

  Thereby, as shown in FIG. 3, in the completed airbag 1, the bottom surface 20 of the first base material portion 1a and the bottom surface 30 of the second base material portion 10b located in the blind spot in the drawing are parallel to each other. In the formed state, each of the side surfaces 10x1 to 10x6 constituting the entire side surface 10 becomes a polyhedron configured as a combination of a pair of triangular planes sharing a diagonal line. FIG. 3 shows an example in which the side surface 10x5 is taken as an example, and a plane 10x5a having vertices C50, C60, and C6 and a plane 10x5b having vertices C5, C6, and C50 are shown.

  Further, as shown in FIG. 4A, the completed airbag 1 has a bottom surface 20 of the first base material portion 1a and a bottom surface 30 of the second base material portion 10b located at the blind spot in the drawing. , And overlaps through all the side surfaces 10 so as to be folded into a flat plate shape.

  In this state, in each of the six side surfaces 10x1 to 10x6 constituting the entire side surface 10 of the first base material portion 1a shown in FIG. 1, the side surfaces 10x1 to 10x6 are in accordance with the mountain fold line MF and the valley fold line VF. By being bent, one side surface adjacent in the same direction along the circumference of the bottom surface 20 overlaps a part of the other side surface, and the bottom surface 20 of the first base material portion 1a and the second base material portion The bottom surface 30 of 10b is on the same axis and is overlapped at a position rotated clockwise.

  Specifically, in the three-dimensional state shown in FIG. 3, the vertex C5 of the bottom surface 20 of the first base material portion 1a closest to and corresponding to the vertex C50 of the second base material portion 10b is shown in FIG. In a), the shift is closest to the vertex C60. The relationship between other vertices is the same.

  In addition, the folded airbag 1 is stored in the airbag apparatus 40 shown in FIG.4 (b) in the state by which six side surfaces 10x1-10x6 were further folded small. The airbag device 40 includes a cover 41 that stores the airbag 1, and a retainer 42 that closes the cover 41 and is fitted with an inflator 43.

  The airbag 1 is fixed in the cover 41 by fastening fastening bolts 44 from the outside of the retainer 42 through the attachment holes 22. Furthermore, gas from the inflator 43 is introduced into the airbag 1 by exposing the gas discharge port 43a of the inflator 43 mounted via the inflator mounting port 21 to the folded interior space of the airbag 1. . In FIG. 4B, the aspect of the airbag 1 that is further folded from the folded state shown in FIG. 4A is schematically shown for simplicity of explanation, and the actual folded state is shown in FIG. It does not show an aspect.

  In the above configuration, the airbag 1 corresponds to the airbag of the present invention, the first base material portion 1a corresponds to the first base material portion of the present invention, and the second base material portion 1b corresponds to the present invention. It corresponds to the second base material portion. Furthermore, the bottom surface 20 of the first base material portion 1a corresponds to the bottom surface of the present invention, and the openings formed by the sides E1 to E6 correspond to the openings of the present invention.

  The first embodiment having such a configuration includes a substantially hexagonal frustum-shaped bowl-shaped first base material portion 1a and a flat plate-like second base material portion 1b. The bottom surface 20 of the base material portion 1a and the bottom surface 30 of the second base material portion 10b are coaxial, and are overlapped at a position rotated between the folded state and the three-dimensional state.

  That is, the air bag device 40 is operated, the gas is introduced into the air bag 1 from the inflator 43, and the retainer 42 is fully expanded and inflated through the three-dimensional state shown in FIG. 4 (a) to FIG. When the folds of the side surfaces 10x1 to 10x6 of all the side surfaces 10 of the fixed first base material portion 1a are developed, the second base material portion 1b is in relation to the bottom surface 20 of the first base material portion 1a. The first base material portion 1a restores a substantially hexagonal frustum shape while rotating in the direction opposite to that when folded. In the state where the airbag 1 is fully deployed and inflated, the creases and other details around the entire side surface 10 and the surface of the second base material portion 1b disappear due to the tension applied to the material. The saddle shape is approximated to a substantially frustoconical shape.

  Thereby, as shown in FIG. 5, the airbag 1 is in the process of restoring the shape of the first base material portion 1 a, and the inflation direction D <b> 1 coincides with the rotational axis direction of the steering 60 or the direction facing the driver 50. It expands greatly in the direction of extending along. Moreover, since the 1st base material part 1a has all the side surfaces 10 which make a slope with respect to the expansion direction D1, the expansion to the surface direction of the 2nd base material part 10b orthogonal to the expansion direction D1 is suppressed. .

  Therefore, the direction of inflation of the bag can be optimized, and as a result, the protection performance of the airbag can be improved with the following gas introduction amount as in the conventional case.

  Further, in the present embodiment, the airbag 1 is inflated with a substantially hexagonal frustum shape shown in FIG. 3, thereby suppressing the spread in the surface direction of the second base material portion 10 b, and the first The stability of the rotation axis direction is improved by the expansion and expansion of all the side surfaces 10 of the second base material portion 1b and the first base material portion 1a, so that the surface of the bag and the outer peripheral portion of the steering wheel 60 This reduces the risk of collision with the rim or the risk of the bag clinging to the steering wheel 60, and has the effect of stabilizing the behavior during deployment and expansion.

  Furthermore, in the present embodiment, the airbag 1 is a combination of the substantially hexagonal frustum-shaped first base material portion 1a and the planar hexagonal second base material portion 1b. In this case, there is an effect that it is possible to suppress the variation in the tension used at the sewing thread and the sewing position used for sewing the base material portions and reduce the risk of breakage of the bag.

  As described above, according to the airbag 1 of the embodiment of the present invention, the first base portion 1a having a substantially hexagonal truncated pyramid shape and the second base portion 1b having a flat plate shape are provided. The bottom surface 20 of the first base material portion 1a and the bottom surface 30 of the second base material portion 10b are coaxial, and have a configuration in which they are overlapped at a position rotated between the folded state and the three-dimensional state. As a result, the inflation direction can be optimized, and as a result, the protection performance of the airbag can be improved.

  However, the present invention is not limited to the above embodiment. In the above description, the airbag 1 is a combination of a substantially hexagonal truncated pyramid-shaped first base material portion 1a and a flat plate-like second base material portion 1b. In the airbag formed by joining the peripheral edges of the first base material portion and the second base material portion, at least one of which has a substantially frustum-shaped bowl shape, as schematically shown in FIG. Position of the bottom surface 30 of the second base material portion on the circumference of the bottom surface 30 in the folded state indicated by the alternate long and short dash line in the transition from the folded state to the expanded state with respect to the bottom surface 20 of the first base material portion. What is necessary is just to move with the rotation to the axis | shaft periphery direction D2 of the expansion direction D1 so that C10-C80 may shift to position C10a-C80a on a continuous line. Therefore, the shape is not limited by the shape of the bottom surface 20 and the bottom surface 30 or the specific mode of the side surface connecting the bottom surface 20 and the bottom surface 30.

  Specifically, the bottom surfaces 20 and 30 may be circular or arbitrary polygonal, and the method of folding each side surface constituting the entire side surface 10 may be arbitrary. Furthermore, all the side surfaces 10 may be composed of curved surfaces. However, when the shapes of the bottom surfaces 20 and 30 are polygons, particularly regular hexagons as described above, a pattern of the base material portion can be efficiently obtained from the original fabric, and the yield can be improved. The present invention can be obtained at a lower cost, which is more preferable.

  Further, as described above, in the folded state, the first base material portion 1a has one side surface adjacent to the entire side surface 10 overlapping a part of the other side surface, and the overlapping direction is along the bottom surface 20. It is more preferable that the airbags can be stably and quickly deployed, and the folded state can be easily formed.

  Furthermore, in the above description, the airbag 1 is composed of the first base portion 1a having a substantially hexagonal truncated pyramid shape and the second base portion 1b having a flat plate shape. The pair of first base material portions 1a may be sewn and configured. In this case, it is more preferable to change the height of the frustum shape because the size of the airbag can be suppressed.

  Furthermore, in the above description, the present invention has been described as being implemented in an airbag in a driver's seat of an automobile, but the present invention may be implemented in an airbag for a passenger seat and a rear seat. Furthermore, as long as the airbag is mounted, the present invention may be carried out in any transportation equipment other than automobiles, such as motorcycles, ships and the like.

  As described above, the airbag of the present invention is an airbag formed by joining the peripheral edges of the first base material part and the second base material part, at least one of which has a substantially frustum-shaped bowl shape. At least one of the first base material portion and the second base material portion has a bottom surface and an opening facing the second base material portion or the first base material portion, and expands from a folded state. In the transition to the state, the bottom surface of the first base material portion or the second base material portion rotates coaxially with the second base material or the first at a predetermined angle. What is necessary is just to restrict | limit, and it is not limited by the other specific objective, an application, and a structure.

  Therefore, the present invention may be implemented by adding various modifications to the above embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

  The present invention as described above has an effect that it is possible to optimize the inflating direction, and is useful, for example, in application to an automobile airbag.

C1 to C6, C10 to C60 Vertex MF Mountain fold line VF Valley fold line 1 Airbag 1a First base material portion 1b, 10b Second base material portion 10 All side surfaces 10x1 to 10x6 Side surfaces 10a, 10b1, 10b2, 20a Sewing allowance 10x5a, 10x5b Plane 20, 30 Bottom 21, 21, Inflator mounting port 22 Mounting hole 40 Airbag device 41 Cover 42 Retainer 43 Inflator 43a Gas outlet 44 Fastening bolt 60 Steering

Claims (1)

At least one of the airbags formed by joining the peripheral edges of the first base material part and the second base material part having a substantially frustum-shaped bowl shape,
At least one of the first base material part and the second base material part has a bottom surface and an opening facing the second base material part or the first base material part,
In the transition from the folded state to the expanded state, the bottom surface of the first base material part or the second base material part is coaxial with the second base material part or the first base material part. To rotate at a predetermined angle,
Airbag.

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