JP2012116362A - Airbag for front passenger seat and airbag system for front passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag for a front passenger seat in which a passenger facing surface is formed into a shape resembling a plane vertically and horizontally in an expansion completion state.SOLUTION: In the air bag for a passenger seat formed by sewing a rear panel 10 at a passenger side and a front panel 20 at an instrument panel side, the rear panel 10 has a top side 11, an upper left side 12, an upper right side 15, a left lateral side 13, a right lateral side 16, a lower left side 14, a lower right side 17 and a lower side 18. A distance Lbetween the right end of the left lateral side 13 and the left end of the right lateral side 16 is approximately equal to a length Lof the lower side 18. Both an angle at the intersection of the upper left side 12 and the left lateral side 13 and an angle θ at the intersection of the upper right side 15 and the right lateral side 16 are larger than 90°. In the inflation completion state, a projection 10f projecting toward the passenger side and extending vertically and horizontally is formed at an upper part of the passenger facing surface.

Description

  The present invention relates to an airbag for a passenger seat, and more particularly to an airbag for a passenger seat in which an occupant-facing surface has a shape that is relatively close to a flat surface in the vertical and horizontal directions when inflated. The present invention also relates to a passenger seat airbag apparatus including the airbag.

  The passenger-seat airbag device is configured to deploy the passenger-seat airbag in front of the passenger-seat occupant and restrain the occupant when the automobile collides. A conventional passenger seat airbag (see, for example, Patent Document 1) is configured such that the occupant-facing surface is convexly curved toward the occupant when viewed from the side and above in the inflated state.

  In Patent Document 1, an airbag is formed by stitching two base fabrics, an upper fabric and a lower fabric. The upper fabric constitutes the upper half side of the left and right side surfaces of the airbag and the upper surface of the airbag, and the lower fabric constitutes the lower half side of the left and right side surfaces of the airbag and the lower surface of the airbag. . Each of the upper cloth and the lower cloth has a substantially sector shape in which the width on the left and right sides becomes larger toward the occupant side, and the side on the occupant side has an arc shape that is convexly curved toward the occupant side. The extension part which comprises the passenger | crew opposing surface of an airbag is continuing in the intermediate part of the left-right direction of the edge | side of the passenger | crew side of an upper cloth. The left side of the extending portion has a convex arc shape toward the left, and the right side has a convex arc shape toward the right. The crossing angle between the left side and the right side of the extension part and the passenger side of the upper cloth is smaller than 90 °.

  The left and right sides of the upper and lower fabrics are stitched together, and the lower side of the extension (the tip side in the direction of extension from the upper fabric) is stitched to the middle of the occupant side of the lower fabric. And the upper half side and the lower half side of the left side of the extension part are respectively sewn on the left end side with respect to the extension part of the passenger cloth side of the upper cloth and the lower cloth, and the upper half side of the right side of the extension part and On the lower half side, the airbag is configured by stitching the right end side of the occupant side side of the upper cloth and the lower cloth from the extended portion.

  When the airbag configured as described above is in an inflated state, the outer surface of the airbag from the extending portion to the upper cloth and the lower cloth is curved to be convex toward the outer side of the airbag. Become. Therefore, when the airbag in an inflated state is viewed from the side and from above, the occupant-facing surface has a shape that is convexly curved toward the occupant.

JP 2000-272465 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a passenger-seat airbag in which the occupant-facing surface has a shape that is close to a plane across the top, bottom, left, and right in the inflated state, and a passenger-seat airbag device including the airbag. .

The passenger seat airbag according to the present invention (Claim 1) is a passenger seat airbag formed by stitching a rear panel on the passenger side and a front panel on the instrument panel side. An upper left side connected to the left end of the upper side, a left side extending to the left side extending to the upper left side, a lower left side continuous to the left end of the left side, an upper right side continuous to the right end of the upper side, It has a right side that extends to the upper right side, extends to the right, a lower right side that continues to the right end of the right side, and a lower side that continues to the lower ends of the lower left side and the lower right side. The distance L ₁ between the right end and the left end of the right side is substantially equal to the length L ₂ of the lower side, the intersection angle θ between the upper left side and the left side, and the upper right side and the right side Are both larger than 90 °, and the upper left side and the left side of the rear panel The upper right side and the right side are sewn, and the upper side, the lower left side, the lower side and the lower right side are sewn to the front panel. A convex portion that protrudes to the side and extends to the left and right is formed.

Passenger-seat airbag according to claim 2, in claim 1, the length L ₂ of the lower side is from 84 to 94% of the distance L ₁ between the right end and left end of the right lateral side of the left lateral sides It is characterized by this.

  The airbag for a passenger seat according to claim 3 is the airbag according to claim 1 or 2, wherein the intersection angle θ between the upper left side and the left lateral side and the intersection angle θ between the upper right side and the right lateral side are 107 respectively. It is ˜117 °.

  The airbag device for a passenger seat according to the present invention (Claim 4) is a folded body of the airbag for a passenger seat according to any one of claims 1 to 3, and a case to which the airbag for the passenger seat is attached. And an inflator for inflating the passenger seat airbag.

In the passenger seat airbag according to the present invention, the upper left side and the left side are provided at the upper left part of the rear panel on the passenger side, the upper right side and the right side are provided at the upper right part, and each intersection angle is 90 °. Greater than °. Further, the distance L ₁ between the right and left ends of Migiyokohen of Hidariyokohen, is substantially equal to the length L ₂ of the lower side. For this reason, the convex part which protrudes to a passenger | crew side and extends right and left is formed in the upper part of the passenger | crew opposing surface of the airbag for passenger seats of the expansion completion state. As a result, the passenger facing surface of the passenger seat airbag in the inflated state has a shape that is close to a plane when viewed from the side, and a shape that is close to a plane when viewed from above. Thereby, it is possible to further improve the safety against the oblique projection with a simple configuration.

When the airbag is inflated, it tends to inflate into a more spherical shape, but the intersection angle θ between the upper left side and the left lateral side and the intersection angle θ between the upper right side and the right lateral side are all 107 to 117 °. and then, also by the length L ₂ of the lower side and from 84 to 94% of the distance L ₁ between the left edge of the right and Migiyokohen of Hidariyokohen, the occupant-facing surface of the passenger seat air bag inflation completion state It is possible to make the shape close to a flat surface in the vertical and horizontal directions. Thereby, the safety | security with respect to an oblique projection can be improved further.

It is a side view which shows the completion state of expansion of the airbag for passenger seats concerning an embodiment. FIG. 2 is a longitudinal sectional view of the passenger seat airbag of FIG. 1. It is a top view of a front panel. It is a top view of a rear panel. It is dimension explanatory drawing of a rear part panel. It is a perspective view which shows the sewing method of a panel. It is a top view which shows the completion state of expansion | swelling of the airbag of FIG.

  Hereinafter, a passenger seat airbag and a passenger seat airbag device according to an embodiment will be described with reference to FIGS. In the following description, the front / rear, left / right and up / down directions correspond to the front / back, left / right and up / down directions of the vehicle, respectively.

  As shown in FIG. 2, the passenger seat airbag 1 is obtained by stitching a rear panel 10 on the passenger side and a front panel 20 on the instrument panel (instrument panel) 2 side, and is inflated by the gas from the inflator 4. . Reference numeral 3 in FIG. 1 denotes a windshield.

  As shown in FIG. 3, the rear panel 10 includes an upper side 11 located on the windshield 3 side, an upper left side 12 connected to the left end of the upper side 11, and a left side extending to the left side extending to the end of the upper left side 12. A side 13, a lower left side 14 that extends downward from the left side of the inflated airbag 1, an upper right side 15 that continues to the right end of the upper side 11, and a terminal of the upper right side 15 A right side 16 extending to the right side and extending to the right side, a lower right side 17 extending to the right side of the inflated airbag 1 and extending to the right side of the inflated airbag 1, and a lower end of the lower left side 14; It has a lower side 18 connecting the lower end of the lower right side 17. An ear piece 19 protrudes from the periphery of the rear panel 10, and a small hole 19 a is provided in the ear piece 19. A positioning jig is inserted into the small hole 19a when the panel is stitched.

  As shown in FIG. 4, the front panel 20 includes a lower side 21 stitched to the lower side 18 of the rear panel 10, a rear left side 22 connected to the left end of the lower side 21, and a front left side 23 connected to the front end of the rear left side 22. The rear right side 24 connected to the right end of the lower side 21, the front right side 25 connected to the front end of the rear right side 24, the left cut side 26 connected to the right end of the front left side 23, and the right connected to the left end of the front right side 25 It has a cut side 27 and a back side 28 that connects the end of the left cut side 26 and the end of the right cut side 27. The left and right cut sides 26 and 27 and the back side 28 form a substantially U-shaped notch in the center of the front side of the front panel 20. An ear piece 29 protrudes from the periphery of the front panel 20, and a small hole 29 a is provided in the ear piece 29. A positioning jig is inserted into the small hole 29a during suturing.

  As shown in FIG. 5, the intersection angle θ between the upper left side 12 and the left side 13 and the intersection angle θ between the upper right side 15 and the right side 16 are both greater than 90 °, preferably 107 to 117 °, particularly 110 to 110 °. 115 °. Since the upper left side 12, the upper right side 15, and the horizontal sides 13 and 16 are all curved, θ is an intersection angle between a line segment b connecting points A and B and a line segment c connecting points A and C. Defined. Point A is the right end of the left lateral side 13 and the left end of the right lateral side 16. Point B is the midpoint of upper left side 12 and upper right side 15, and point C is the midpoint of horizontal sides 13 and 16.

Further, as shown in FIG. 5, the distance L ₁ between the right end A of the left lateral side 13 and the left end A of the right lateral side is substantially equal to the length L ₂ of the lower side 18. Preferably, _{L 2} is 84-94% of _{L 1,} in particular 85% to 90%. Since the left and right ends of the lower side 18 is curved to define an extension d of the left 14 and right 17, the intersection D between the extension line e of d and the lower side 18, the distance between D and L _2.

  The front panel 20 is provided with an opening 30 for the inflator 4 in the vicinity of the back side 28. Further, an insertion hole 31 for a mounting bolt (not shown) for the airbag 1 and the inflator 4 is provided around the opening 30.

  When the airbag 1 is sewn using the panels 10 and 20, the upper left side 12 and the left side 13 are sewn and the upper right side 15 and the right side 16 are sewn as shown in FIG. To do. S indicates a stitched seam. Thereby, a three-dimensional shape having the occupant facing surface 10b, the upper surface 10a, and the left and right side surfaces 10c is formed. The upper surface 10a of the rear panel 10 constitutes the rear half of the upper surface of the airbag 1 product, the occupant facing surface 10b constitutes the occupant facing surface of the airbag 1 product, and the left and right side surfaces 10c respectively The second half of the side is constructed.

  The upper surface 10a of the rear panel 10 is substantially a line segment connecting the right end of the upper side 11, the upper left side 12, the left lateral side 13 and the left end of the right lateral side 16 of the rear panel 10 (that is, the point A, A line segment connecting A to each other) and an area defined by the upper right side 15.

  The occupant facing surface 10b of the rear panel 10 is substantially a line segment connecting the right end of the left lateral side 13 and the left end of the right lateral side 16 of the rear panel 10, and the right end and the lower side 18 of the left lateral side 13. A line segment connecting the left end of the left side (ie, a line segment connecting the points A and D on the left side), the lower side 18, and a line segment connecting the right end of the lower side 18 and the left end of the right lateral side 16 (ie the point on the right side). The line segment is defined by a line segment connecting D and A).

  The left side surface 10c of the rear panel 10 is substantially defined by the left side 13, the lower left side 14, and the line connecting the lower end of the lower left side 14 and the right end of the left side 13 of the rear panel 10. It is constituted by a defined area.

  The right side surface 10c of the rear panel 10 is substantially defined by a right side 16, a lower right side 17, and a line segment connecting the lower end of the lower right side 17 and the left end of the right side 16 of the rear panel 10. It is constituted by a defined area.

  Since the rear panel 10 is configured in this manner, the occupant facing surface 10b has a substantially rectangular shape when viewed from the occupant side when the airbag 1 is inflated. Further, at the left and right ends of the upper portion of the occupant facing surface 10b, the corners where the occupant facing surface 10b, the upper surface 10a, and the side surfaces 10c intersect are convex angles at which the bottom surface of the quadrangular pyramid and two adjacent slopes intersect, respectively. It becomes the shape like the part. Thereby, the convex part 10f which protrudes in the passenger | crew side and extends the upper part of the passenger | crew opposing surface 10b to the left and right is formed in the upper part of the passenger | crew opposing surface 10a.

  For the front panel 20, the left half of the back side 28 and the left cut side 26 are stitched, and the right half of the back side 28 and the right cut side 27 are stitched. Further, the front left side 23 and the front right side 25 are stitched together. Thereby, a three-dimensional shape having an upper surface 20a, a lower surface 20b, and left and right side surfaces 20c is formed. The upper surface 20a of the front panel 20 constitutes the first half of the upper surface of the airbag 1 product, the lower surface 20b constitutes the lower surface of the airbag 1 product, and the left and right side surfaces 20c respectively form the first half of the left and right side surfaces of the airbag 1 product. The side is configured.

  The left half side of the upper surface 20a of the front panel 20 is substantially the front left side 23 of the front panel 20 and the upper part 22a of the rear left side 22 (of the rear left side 22, of the rear panel 10 as described later). A portion sewn to the upper side 11. See FIGS. 4 and 6.), a line segment connecting the lower end of the upper portion 22a of the rear left side 22 and the end of the left cut side 26 on the back side 28, and the left cut The region is defined by a side 26.

  The right half side of the upper surface 20a of the front panel 20 is substantially the front right side 25 of the front panel 20 and the upper part 24a of the rear right side 24 (of the rear right side 24, the rear panel 10 as will be described later). A portion sewn to the upper side 11. See FIGS. 4 and 6.), a line segment connecting the lower end of the upper portion 24a of the rear right side 24 and the end of the right cut side 27 on the back side 28, and the right cut The region is defined by the side 27.

  The lower surface 20b of the front panel 20 is substantially composed of a lower side 21 of the front panel 20, a line connecting the left end of the lower side 21 and the left end of the back side 28, the back side 28, and the back side. The region is defined by a line segment connecting the right end of 28 and the right end of the lower side 21.

  The left side surface 20c of the front panel 20 is substantially sewn to the lower portion 22b of the rear left side 22 of the front panel 20 (the lower left side 14 of the rear panel 10 of the rear left side 22 as will be described later). 4 and 6), a line segment connecting the upper end of the lower part 22 b of the rear left side 22 and the left end of the rear side 28, and the left end of the rear side 28 and the lower end of the lower part 22 b of the rear left side 22. The region is defined by a line segment.

  The right side surface 20c of the front panel 20 is substantially sewn to the lower portion 24b of the rear right side 24 of the front panel 20 (the lower right side 17 of the rear panel 10 of the rear right side 24 as described later. 4, 6), a line segment connecting the upper end of the lower part 24 b of the rear right side 24 and the right end of the rear side 28, and the right end of the rear side 28 and the lower end of the lower part 24 b of the rear right side 24. The region is defined by a line segment.

  Next, the rear panel 10 and the front panel 20 each having a three-dimensional shape are stitched together. At this time, the lower side 18 of the rear panel 10 and the lower side 21 of the front panel 20 are sewn, the lower left side 14 of the rear panel 10 is sewn to the lower part 22b of the rear left side 22 of the front panel 20, and the lower right side 17 is The lower side 24b of the right side 24 is sewn. Further, the upper side 11 of the rear panel 10 is stitched to the upper part 22 a of the rear left side 22 of the front panel 20 and the upper part 24 a of the rear right side 24. Thereafter, the airbag 1 is turned upside down through the inflator opening 30 to place the seam allowance in the airbag 1 to obtain the product-type airbag 1.

  The airbag 1 has an inflator 4 attached, is folded, and is installed in a box-like case 5 (FIG. 2). The instrument panel 2 is provided with a lid 6 (FIG. 1) so as to cover the folded body of the airbag 1. The folded airbag 1, inflator 4, and case 5 constitute a passenger seat airbag device. The lid 6 may be provided as a part of the instrument panel 2 or may be provided as a lid-like member separate from the instrument panel 2. In the latter case, the lid 6 is connected to the case 5.

When the inflator 4 is activated, the airbag 1 pushes open the lid 6 and deploys in front of the passenger on the passenger seat, thereby restraining the passenger. As shown in FIG. 5, the airbag 1 is set such that L ₁ ≈L ₂ and θ> 90 °. Therefore, as shown in FIG. 1, when the airbag 1 in an inflated state is viewed from the side, a convex portion 10f protruding toward the occupant side is formed on the upper portion of the occupant facing surface 10b. The convex part 10f is a crossing line between the occupant facing surface 10b and the upper surface 10a, and as shown in FIG. 7, the upper part of the occupant facing surface 10b extends to the left and right. As a result, in the airbag 1 in the inflated state, the occupant facing surface 10b has a shape close to a plane in the vertical and horizontal directions as shown in FIGS.

  In the airbag 1, the occupant restraint performance at the time of a vehicle oblique collision (a collision mode in which an impact is applied to the vehicle obliquely from the front, including an offset collision) is higher. This will be described with reference to FIG. A two-dot chain line 100 in FIG. 7 schematically shows an occupant-facing surface of a conventional airbag. In the inflated state, the occupant-facing surface 100 is convexly curved toward the occupant side. It has a shape.

  When the vehicle leans, the passenger occupant P tries to move diagonally forward. At this time, in the conventional airbag, the occupant-facing surface 100 is curved so that the left end side and the right end side thereof are retracted toward the vehicle front side (that is, along the movement direction of the occupant) in the inflated state. Therefore, when the occupant moves obliquely forward and contacts the left end side or the right end side of the center of the occupant facing surface 100, the reaction force applied to the occupant from the occupant facing surface 100 (the oblique forward movement of the occupant) In order to make the restraining force) sufficient, strict internal pressure management is required, and the design may be complicated. On the other hand, in the airbag 1 of the present invention, in the inflated state, as shown in FIG. 7, the occupant facing surface 10b has a shape close to a plane over the left and right sides, and also on the left end side and the right end side thereof. Since each occupant is deployed so as to face the occupant, even if the occupant moves obliquely forward and contacts the left end side or the right end side from the center of the occupant facing surface 10b, the occupant facing surface 10b is directed to the occupant. A sufficient reaction force can be applied, and the occupant can be restrained from moving diagonally forward. Thereby, in the airbag 1 of this invention, higher performance can be exhibited with respect to the passenger | crew restraint performance at the time of the vehicle's oblique collision with a simple structure compared with the conventional airbag.

  Further, in the airbag 1 of the present invention, when inflated, as shown in FIG. 1, the occupant facing surface 10b has a shape close to a flat surface in the vertical direction, so that the occupant facing surface 10b is occupant. When the vehicle is restrained, the occupant is prevented from excessively leaning forward.

DESCRIPTION OF SYMBOLS 1 Airbag 2 Instrument panel 3 Windshield 4 Inflator 5 Case 6 Lid 10 Rear panel 11 Upper side 12 Upper left side 13 Left side 14 Lower left side 15 Upper right side 16 Right side 17 Lower right side 18 Lower side 20 Front panel 21 Lower side 22 Rear left side 23 Front left side 24 Rear right side 25 Front right side 26 Left cut side 27 Right cut side 28 Back side 30 Inflator opening 31 Small hole

Claims (4)

In the passenger seat airbag formed by stitching the rear panel on the passenger side and the front panel on the instrument panel side,
The rear panel includes an upper side located on the windshield side, an upper left side continuous to the left end of the upper side, a left side extending to the left side connected to the upper left side, a lower left side continuous to the left end of the left side, the upper side An upper right side that is connected to the right end of the right side, a right side that extends to the right and extends to the right, a lower right side that is connected to the right end of the right side, and a lower side that is connected to the lower ends of the lower left side and the lower right side. And
The distance L ₁ between the right end of the left side and the left end of the right side is substantially equal to the length L ₂ of the lower side,
The intersection angle θ between the upper left side and the left lateral side and the intersection angle θ between the upper right side and the right lateral side are both greater than 90 °,
The upper left side and the left side of the rear panel are sewn, the upper right side and the right side are sewn,
The upper side, lower left side, lower side and lower right side are stitched to the front panel,
An airbag for a passenger seat, characterized in that, in an inflated state, a convex portion that protrudes toward the occupant and extends to the left and right is formed on the upper portion of the occupant-facing surface. According to claim 1, wherein the length L ₂ of the bottom side, passenger airbag, wherein the a 84 to 94% of the distance L ₁ between the right edge of the left horizontal side and the left end of the right lateral edge.   3. The assistant according to claim 1, wherein an intersection angle θ between the upper left side and the left lateral side and an intersection angle θ between the upper right side and the right lateral side are 107 to 117 °, respectively. Seat airbag.   A folded body of the passenger seat airbag according to any one of claims 1 to 3, a case to which the passenger seat airbag is attached, and an inflator for inflating the passenger seat airbag. A passenger-side airbag device provided.

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