JP2019043474A - Rear seat air bag - Google Patents

Abstract

A rear seat airbag that reduces the amount of deflection of the chest when the chest is restrained. A rear seat airbag (1) includes a top chamber (10) that inflates along a ceiling (4), a first chamber (11) that inflates downward from the rear of the top chamber (10), and a lower part of the first chamber (11). It has a second chamber 12 which is connected to the second chamber 12 and expands downward, and a third chamber 13 which is connected to the lower part of the second chamber 12 and expands forward. The connection between the inflated second chamber 12 and the third chamber 13 constrains the chest. A concave portion 16 is provided in the central portion of the connecting portion in the left and right direction. [Selection drawing] Fig. 1

Description

  The present invention relates to a rear seat air bag for restraining a rear seat passenger of a car.

  As a rear seat air bag for restraining a rear seat passenger, Patent Document 1 describes one having both end portions for receiving the left and right shoulders of the passenger and a recess into which the head is inserted. The recess extends continuously from the upper end to the lower end of the rear surface of the airbag.

  Patent Document 2 describes a roof airbag having an outcushion for receiving left and right shoulders and a chest of an occupant, and an inner cushion recessed from the outcushion to the front of the vehicle. The inner cushion restrains the head of the occupant.

  Patent Document 3 describes a rear seat airbag that is inflated so as to have a V-shaped in a side view.

JP, 2014-237382, A JP, 2013-82418, A International Publication 2014/016432

  An object of the present invention is to provide a rear seat air bag in which the amount of chest deflection at the time of chest restraint is reduced.

  The air bag for the rear seat according to the present invention is a rear seat air bag inflated by the gas from the inflator toward the front of the rear seat occupant, and is inflated downward from the ceiling portion of the passenger compartment to face the upper body of the occupant. A chamber, and a lower portion of the vertical chamber, the front and rear direction chambers expanding in a forward direction, and the connection portion between the vertical direction chamber and the front and rear direction chamber faces the occupant's chest in an expanded state; A concave portion is provided on the occupant side at the center in the left-right direction of the connecting portion.

  In one aspect of the present invention, the shoulder restraint surface of the inflated rear seat airbag is located rearward of the chest restraint surface.

  In one aspect of the present invention, the recess is formed by the non-inflatable portion of the rear seat airbag.

  In one aspect of the present invention, the non-inflatable portion is formed by a stitch surrounding the non-inflatable portion.

  In one aspect of the present invention, the stitches are square or hexagonal stitches.

  In one aspect of the present invention, in the vertical chamber of the inflated rear seat airbag, the recess has a smaller width in the upper direction, and in the longitudinal chamber, the recess has a width in the forward direction. It is getting smaller.

  In one aspect of the present invention, the front and rear direction chamber is expanded such that the front end abuts on the rear surface of the front seat.

  A rear seat air bag according to one aspect of the present invention includes a first chamber expanding downward and rearward from a cabin ceiling, and a second chamber extending downward and continuous with a lower portion of the first chamber. And a third chamber connected to the lower portion of the second chamber and expanding forward.

  The rear seat air bag according to one aspect of the present invention comprises a first tether bridged between a junction between the first chamber and the second chamber or the periphery thereof and a front portion of the first chamber. Have.

  The rear seat air bag according to one aspect of the present invention has a second tether bridged between a connecting portion of the second chamber and the third chamber and a front portion of the first chamber.

  In one aspect of the present invention, a third tether is provided that is bridged between the front of the third chamber and the front portion of the first chamber.

  In one aspect of the present invention, the rear seat air bag has a top chamber that expands along a cabin ceiling, and the first chamber is connected to the rear of the top chamber, and the first tether is The upper ends of the second and second tethers are continuous with the front of the top chamber.

  In one aspect of the present invention, the connecting portion between the first chamber and the second chamber and the connecting portion between the second chamber and the third chamber have a narrow gas flow path width.

  In one aspect of the present invention, a recess is formed in the upper part of the rear face of the expanded vertical chamber, into which the occupant's head enters, and the lower edge of the recess abuts the occupant's jaw.

  In one aspect of the present invention, the upper portion of the rear face of the expanded vertical chamber is provided with a vertically extending slot into which the head of the occupant is inserted.

  In one aspect of the present invention, the central portion in the left-right direction of the lower end of the recessed portion is a rising portion projecting upward, and the jaw of the passenger abuts on the rising portion.

  When the rear seat airbag of the present invention is inflated, the vertical chamber faces the upper body of the occupant, and the front and rear chamber extends in the front-rear direction. The connection between the vertical chamber and the longitudinal chamber faces the occupant's chest. Since a concave portion is provided at the center on the occupant side in the lateral direction of the connecting portion, the amount of deflection of the chest of the occupant restrained by the rear seat airbag is reduced.

  In one aspect of the present invention, the upper portion of the vertical chamber is formed with a recess into which the head of the occupant enters when the occupant is restrained, and the lower edge of the recess abuts the jaw of the occupant. As a result, the reaction force that the head of the occupant receives from the rear seat airbag is reduced.

It is a side view at the time of expansion of the air bag for backseats concerning an embodiment. It is a perspective view at the time of expansion of the air bag for backseats concerning an embodiment. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a top view in the non-inflation state of the air bag for backseats concerning an embodiment. It is the VII-VII sectional view taken on the line of FIG. 6 at the time of air bag inflation for backseats. It is a side view at the time of expansion of the air bag for backseats concerning another embodiment. It is the IX-IX sectional view taken on the line of FIG. It is an X arrow line view of FIG. It is a XI-XI line sectional view of FIG. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment. It is a top view in the uninflated state of the air bag for backseats concerning another embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In the following description, the front and rear, and the top and bottom correspond to the front, rear, top and bottom of the vehicle equipped with the rear seat airbag device.

  1 to 7 show a rear seat airbag 1 according to an embodiment of the present invention. The rear seat air bag 1 is intended to restrain the occupant M of the rear seat 3 by being inflated downward or backward and backward from the ceiling 4 of the vehicle between the front seat 2 and the rear seat 3 of the vehicle. is there.

  The rear seat airbag 1 includes a first chamber 11 that expands downward and rearward from the ceiling 4, and a second chamber 12 that extends downward and is continuous with the lower portion of the first chamber 11. It has a third chamber 13 connected to the lower part of the second chamber 12 and expanding forward. In this embodiment, the first chamber 11 and the second chamber 12 constitute a vertical direction chamber, and the third chamber 13 constitutes a front and rear direction chamber.

  In this embodiment, the rear seat airbag 1 further includes a top chamber 10 that inflates along the ceiling 4. The first chamber 11 is connected to the rear of the top chamber 10. An inflator 14 is installed in the top chamber 10, and the gas from the inflator 14 inflates the rear seat airbag 1.

  The rear seat airbag 1 includes first to third tethers 21 to 23 that connect the front portion of the top chamber 10 and a predetermined portion of the rear seat airbag 1.

  The first tether 21 is disposed on the front side of the first chamber 11, and the second tether 22 is disposed on the front side of the first and second chambers 11 and 12. The upper end of each tether 21-23 is sewn to the front of the top chamber 10. The lower end (rear end) of the first tether 21 is sewed on a connecting portion (boundary portion) between the first chamber 11 and the second chamber 12. The lower end of the second tether 22 is sewn to a connecting portion between the second chamber 12 and the third chamber 13. The lower end of the third tether 23 is sewn to the front of the third chamber 13. The rear seat airbag 1 further includes a fourth tether 24 bridged between the rear of the third chamber 13 and the first chamber 11.

  The top chamber 10 elongates in the front-rear direction. The first chamber 11 and the upper portion of the second chamber 12 gradually increase in lateral width downward. The lower portion of the second chamber 12 and the lateral width of the third chamber 13 are substantially uniform.

  The second chamber 12 is located near the front of the head H of the rear seat occupant M from the chest. The connection (boundary) between the second chamber 12 and the third chamber 13 is located near the front of the chest. At the connection portion between the second chamber 12 and the third chamber 13, a recess 16 is provided in the vicinity of the center of the airbag 1 in the left-right direction.

  The rear seat airbag 1 is manufactured by stitching the front panel 31 and the rear panel 32 as shown in FIGS.

  FIG. 6 is a plan view of a state in which the rear seat airbag 1 is expanded flatly before expansion, and FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6 in a state in which the rear seat airbag 1 is expanded. There is.

  The front panel 31 and the rear panel 32 are made of a substantially rectangular base fabric which is long in one direction, and their peripheral edge portions are sewn by a suture 33. The front panel 31 and the rear panel 32 are also sewn by annular seams 41 to 43, 51 to 53, linear seams 61 to 63, 71 to 73, and a square seam 80 which will be described next.

  A plurality of (three in this embodiment) annular seams 41, 42 and 43 are provided in the width direction of the rear seat airbag 1 at an interval in the vicinity of the middle of the first chamber 11 in the panel longitudinal direction. It is done. A plurality of (three in this embodiment) annular seams 51, 52, 53 are provided in the width direction of the rear seat airbag 1 at intervals in the vicinity of the tip of the third chamber 13.

  A quadrangular seam 80 is provided in the vicinity of the boundary between the second chamber 12 and the third chamber 13. The quadrangular seam 80 is composed of sides 81 to 84. The sides 81 and 82 are located on the second chamber 12 side, and the sides 83 and 84 are located on the third chamber 13 side. The ends of the sides 81 and 82 are connected with each other, and the ends of the sides 83 and 84 are connected with each other. The other ends of the sides 81 and 83 and the other ends of the sides 82 and 84 are connected.

  In the present invention, the maximum lateral width of the inner region 16 'surrounded by the square stitch 80 in FIG. 6 is preferably 200 to 400 mm, particularly 250 to 350 mm. The maximum vertical width of the inner region 16 'in FIG. 6 is preferably 200 to 400 mm, and more preferably 250 to 350 mm. In the present invention, the inner region (non-expansive portion) is not limited to a quadrangle, and may be a pentagon or a polygon having six or more hexagons, a circle, an ellipse, or a shape approximating them. .

  Straight seams 61, 62, 63 are provided from the annular seams 41 to 43 toward the square seam 80. Straight seams 71 to 73 are provided from the annular seams 51 to 53 toward the square seam 80. Straight seams 61-63, 71-73 are parallel and extend in the longitudinal direction of the panels 31, 32.

  Straight stitches 61, 63, 71, 73 are continuous near the left and right ends of the square stitch 80. The straight stitches 62 are connected to the connecting portions of the sides 81 and 82, and the straight stitches 72 are connected to the connecting portions of the sides 83 and 84.

  The top chamber 10 has a shape extending in an elongated manner from the center of the first chamber 11 in the left-right direction, and the inflator 14 is disposed therein. In this embodiment, the inflator 14 is a cylinder type, and as shown in FIG. 3, a stud bolt 14 a protrudes from the side surface of the inflator 14. The stud bolt 14a protrudes through the bolt insertion hole provided in the rear panel 32 to the outside of the rear seat airbag 1, and is fixed to the case of the rear seat airbag device. The inflator 14 is disposed such that the gas jet nozzle faces the first chamber 11.

  Annular seams 41 to 43, 51 to 53, straight seams 61 to 63, 71 to 73, and square seams 80 restrict the thickness of the rear seat airbag 1 or the width of the rear seat airbag 1 Ru.

  By providing the annular seams 41 to 43, the gas passage width is narrowed at the annular seams 41 to 43, that is, in the vicinity of the center of the first chamber 11 in the panel longitudinal direction. Sometimes the rear seat airbag 1 is easily bent at this portion. Similarly, by providing the quadrangular seam 80, when the rear seat air bag 1 is inflated, the rear seat air bag 1 is formed at the connecting portion (boundary portion) between the second chamber 12 and the third chamber 13 It is easy to bend.

  Further, since the gas from the inflator 14 does not flow into the inner region 16 ′ surrounded by the square seam 80, this inner region becomes a non-inflatable portion that does not expand when the airbag 1 is expanded, and forms the recess 16. . The upper portion of the recess 16 sandwiched between the sides 81 and 82 has a smaller width in the upper direction. The front portion of the recess 16 sandwiched between the sides 83 and 84 has a smaller width in the forward direction.

  The lower end of the third tether 23 is sewn in the annular stitches 51 and 53 as shown in FIG. The code | symbol 23a of FIG. 7 has shown this suture thread. The lower end (rear end) of the first tether 21 is sewn in the annular stitches 41 and 43. The upper end of the fourth tether 24 is sewed on the rear side of the top chamber 10, and the lower end is sewn on the rear side of the third chamber 13.

  The rear seat airbag 1 configured in this manner is folded and accommodated in the case, disposed in the ceiling portion 4, and covered by the roof garnish or the case cover.

  At the time of a vehicle collision, the inflator 14 operates to eject gas, and the rear seat airbag 1 is inflated. As shown in FIG. 1, the top chamber 10 expands along the ceiling 4, and the first chamber 11 obliquely expands downward and rearward from the rear end of the top chamber 10. The second chamber 12 expands downward from the lower end of the first chamber 11, and the third chamber 13 expands forward from the lower end of the second chamber 12. The front end of the third chamber 13 abuts on the rear surface of the front seat 2.

  The crossing angle between the inflated occupant restraint surface of the second chamber 12 and the horizontal surface on the front side of the second chamber 12 is preferably 20 to 95 °, particularly 30 to 80 °. When the crossing angle is 90 ° or more, the shoulder restraint surface of the second chamber 12 is located rearward of the chest contact surface.

  The connection between the first chamber 11 and the second chamber 12 and the connection between the second chamber 12 and the third chamber 13 are pulled forward and upward by the first and second tethers 21 and 22, respectively. The first chamber 11 and the second chamber 12 expand to a position along the upper body of the rear seat occupant M. At this time, the second chamber 12 is inclined such that the upper side is the front. The third chamber 13 becomes substantially horizontal as its front portion is pulled upward by the third tether 23.

  The upper body of the rear seat occupant M is restrained by the second chamber 12 or the first chamber 11 thus expanded. Since the second chamber 12 is widely deployed in front of the upper body of the occupant in a substantially planar shape, the receiving area for receiving the occupant M is large. The forward movement of the first chamber 11 and the second chamber 12 is suppressed by the front end of the third chamber 13 of the rear seat airbag 1 inflated in this way coming into contact with the rear face of the front seat 2.

  In this embodiment, as shown in FIG. 1, the connection between the second chamber 12 and the third chamber 13 faces the occupant's chest. Since the concave portion 16 exists in the left and right central part of the connecting part on the occupant M side, the maximum value of the reaction force received from the airbag 1 in the left and right central part of the chest, ie, near the sternum, is reduced. It is reduced. The left and right regions of the chest relative to the vicinity of the sternum are received and constrained in the left and right regions of the recess 16 respectively.

  In the above description, although the gas does not flow into the inner region 16 'and becomes the non-inflatable portion when the airbag 1 is inflated, a small amount of gas may flow.

  In the present invention, as in the airbag 1A of FIGS. 8 to 11, a recessed portion 90 into which the head H of the occupant enters at the time of a collision may be provided in the upper portion of the second chamber 12. As shown in FIGS. 9 and 10, the recessed portion 90 is formed by sewing the panels 31 and 32 with the stitches 91.

  A rising portion 92 rising upward is provided at the center in the left-right direction of the lower side of the recessed portion 90. When the occupant's head H is restrained by the airbag 1A, the jaw j of the occupant hits the rising portion 92, and the head H above the jaw j pivots forward with the jaw j as a fulcrum Get into 90. By providing the recessed portion 90, the maximum value of the reaction force that the occupant's head H receives from the airbag 1A at the time of restraint is reduced.

  Note that the recess 90 may extend further upward than that shown in FIGS.

  Instead of providing the recessed portion 90, a slot (a long hole penetrating from the occupant side to the front side of the rear seat airbag 1) is provided in the portion of the linear seam 62, and the head of the occupant enters the slot and is restrained It may be configured as

  A rear seat air bag according to still another embodiment of the present invention will be described with reference to FIGS.

  In the rear seat airbag 1B of FIG. 12, annular seams 85 and 86 are provided on the left and right ends of the square seam 80, and the sides 81 and 83 are connected to the annular seam 85, and the sides 82 and 84 are annular seams. It is linked to 86. Further, an annular seam 52 is provided at a portion where the sides 83 and 84 intersect, and the linear seam 72 extends from the annular seam 52 to the front end of the third chamber 13. The other configuration of the rear seat airbag 1B is the same as that of the rear seat airbag 1, and the same reference numerals indicate the same parts.

  In the rear seat airbag 1 </ b> C shown in FIG. 13, a hexagonal stitch 80 </ b> C is provided instead of the square stitch 80. Straight stitches 62 and 72 are connected to the hexagonal stitch 80C. The annular seams 85 and 86 are apart from the hexagonal seam 80C. The annular seam 52 is omitted but may be provided. The other configuration of the rear seat airbag 1C is the same as that of the rear seat airbag 1B, and the same reference numerals indicate the same parts.

  In the rear seat airbag 1D of FIG. 14, a hook-shaped stitch 80D is provided instead of the hexagonal stitch 80C. Straight seams 71, 73 extend to the front end of the third chamber 13. The other configuration of the rear seat airbag 1D is the same as that of the rear seat airbag 1C, and the same reference numerals indicate the same parts.

  In the rear seat airbag 1E of FIG. 15, small square stitches 80E are provided instead of the annular seam 85, the hook seam 80D and the annular seam 86 of the rear seat airbag 1D. Instead of the quadrangular stitches 80E, stitches of other shapes such as hexagonal may be provided. The other configuration of the rear seat airbag 1E is the same as that of the rear seat airbag 1D, and the same reference numerals indicate the same parts.

  In the rear seat airbag 1F of FIG. 16, an annular seam 87 is provided instead of the hexagonal seam 80C of the rear seat airbag 1C. Further, the lower end of the linear stitch 62 is separated from the annular stitch 87, and the annular stitch 88 is provided at the lower end of the linear stitch 62. An annular seam 52 is provided at the end of the linear seam 72 in the same manner as the rear seat airbag 1, but as the rear seat airbag 1D of FIG. It may extend to the tip of the seat airbag 1. The other configuration of the rear seat airbag 1F is the same as that of the rear seat airbag 1C, and the same reference numerals indicate the same parts.

  The rear seat airbag 1G shown in FIG. 17 is such that the upper end of the linear stitch 72 is separated from the annular seam 87 in the rear seat airbag 1F. An annular seam 89 is provided at the upper end of the linear seam 72. The other configuration of the rear seat airbag 1G is the same as that of the rear seat airbag 1F, and the same reference numerals indicate the same parts.

  The rear seat airbag 1H in FIG. 18 is obtained by omitting the annular seam 87 in the rear seat airbag 1G and providing a horizontal straight seam 100 so as to connect the annular seams 85 and 86. . The other configuration of the rear seat airbag 1H is the same as that of the rear seat airbag 1G, and the same reference numerals indicate the same parts.

  The above embodiment is an example of the present invention, and the present invention may have a configuration other than that illustrated. For example, although three linear stitches 61 to 63, 71 to 73 are provided in each of the above embodiments, the number may be two or four or more. Further, the top chamber 10 may be omitted, and the gas jetted from the inflator 14 may be directly introduced into the first chamber 11. The upper ends of the first to third tethers 21 to 23 may be connected to a vehicle member, such as a case of a rear seat airbag device.

1, 1A to 1H Rear seat airbag 2 front seat 3 rear seat 4 ceiling 10 top chamber 11 first chamber 12 second chamber 13 third chamber 16 recess 16 'inner region (non-inflatable portion)
21 to 24 tether 31 front panel 32 rear panel 41 to 43, 51 to 53, 88 to 89 annular seams 61 to 63, 71 to 73, 100 straight seam 80, 80 E square seam 90 recessed portion 92 rising portion

Claims (16)

In a rear seat air bag which is inflated in front of a rear seat passenger by gas from an inflator,
A vertical chamber which is inflated downward from the cabin ceiling and faces the upper body of the occupant;
The lower portion of the vertical chamber is connected to the lower portion of the vertical chamber, and includes a front and rear direction chamber expanding forward, and the connection portion between the vertical direction chamber and the front and rear direction chamber faces the occupant's chest in the expanded state. A rear seat airbag characterized in that a recess is provided on the occupant side in the center in the left-right direction.   The rear seat air bag according to claim 1, wherein the shoulder restraint surface of the inflated rear seat air bag is located rearward of the chest restraint surface.   The rear seat air bag according to claim 1 or 2, wherein the recess is formed by a non-inflatable portion of the rear seat air bag.   4. The air bag for the rear seat according to claim 3, wherein the non-inflatable portion is formed by a stitch surrounding the non-inflatable portion.   5. The rear seat airbag according to claim 4, wherein the stitches are square or hexagonal stitches.   The rear seat air bag according to any one of claims 1 to 5, wherein in the vertical direction chamber of the inflated rear seat air bag, the recess has a smaller width in the upper direction, and the front and rear direction chamber In the rear seat airbag, the recess has a smaller width in the forward direction.   The rear seat air bag according to any one of claims 1 to 6, wherein the front-rear direction chamber is inflated such that a front end thereof abuts on a rear face of a front seat. In the rear seat airbag according to any one of claims 1 to 7,
A first chamber which expands downward and rearward from the cabin ceiling;
A second chamber extending downward from the lower portion of the first chamber;
A rear seat air bag having a third chamber which is connected to a lower portion of the second chamber and which is expanded forward.   9. The air bag for the rear seat according to claim 8, further comprising: a first tether bridged between a connecting portion of the first chamber and the second chamber or its periphery and a front portion of the first chamber. A rear seat airbag characterized by   10. The air bag for the rear seat according to claim 8 or 9, further comprising a second tether bridged between a connecting portion of the second chamber and the third chamber and a front portion of the first chamber. A rear seat airbag.   The rear seat air bag according to any one of claims 8 to 10, further comprising a third tether bridged between a front portion of the third chamber and a front portion of the first chamber. Rear seat airbag characterized by The rear seat airbag according to any one of claims 8 to 11, wherein the rear seat airbag has a top chamber which is inflated along a cabin ceiling.
The first chamber is connected to the rear of the top chamber,
A rear air bag, wherein upper ends of the first tether and the second tether are connected to a front portion of the top chamber.   The rear seat airbag according to any one of claims 8 to 12, wherein the connecting portion between the first chamber and the second chamber and the connecting portion between the second chamber and the third chamber have a narrow gas flow path width. A rear seat airbag characterized by The air bag for the rear seat according to any one of claims 1 to 13, wherein a recessed portion into which the head of an occupant is inserted is formed in an upper portion of a rear surface of the expanded vertical chamber.
A rear seat airbag characterized in that a passenger's jaw abuts on a lower edge of the recessed portion.   The rear seat air bag according to claim 13, wherein a central portion in the left and right direction of a lower end of the recessed portion is a rising portion projecting upward, and a jaw of a passenger abuts on the rising portion. Seat airbags.   The air bag for the rear seat according to any one of claims 1 to 13, wherein a vertically extending slot is provided in the upper part of the rear face of the expanded vertical chamber into which the occupant's head enters. A rear seat airbag characterized by.

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