JP2005096653A - Air bag for rear seat, and air bag device for rear seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag for a rear seat and an air bag device for the rear seat having higher protection performance of a rear seat occupant. <P>SOLUTION: The air bag 16 deploys and inflates on the back side of a backrest section 18 of a front seat 11 from an air bag module 10 fixed to the lower surface of the seat 12 of the front seat 11. The air bag 16 comprises a front side inflation part 19 deploying and inflating upward along the back surface of the backrest section 18 and a rear side inflation part 20 opening and inflating backward from the tip side of the front side inflation part 19. The outside of the air bag 16 is provided with two pairs of right and left reinforcing cloths 29R for constraining the rear side inflation part 20 to the front side inflation part 19 so that the rear side inflation part 20 covers the knees 21 to the upper parts of the thighs 32 of the rear seat occupant 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a rear seat airbag that deploys and inflates between a front seat and a rear seat when an impact due to a collision or the like is applied to the vehicle, and a rear seat airbag including the rear seat airbag. It relates to the device. In this specification, “front seat” means a seat with other seats behind, and is not limited to a driver seat and a passenger seat. The “rear seat” means a seat behind the “front seat”.

Conventionally, as a rear seat airbag device of this type, an airbag module is deployed and inflated in front of a chest and a head of a rear seat occupant from an airbag module provided at a rear portion of a seat portion of a front seat. There is something. The airbag is deployed and inflated upward along the back of the backrest portion of the front seat in the first stage, and deployed and inflated in front of the chest and head of the rear seat occupant in the second stage.
Japanese translation of PCT publication No. 2002-542100 (page 10, FIG. 1)

  However, in the technique of the above-mentioned Patent Document 1, an attempt is made to control the deployed and inflated state only by the shape of the airbag, but the portion above the knee of the airbag escapes upward toward the tip side. Therefore, for example, when the rear seat occupant moves forward from the rear seat due to a frontal collision with another vehicle, it is difficult to effectively receive the chest and head of the rear seat occupant with the airbag, and the rear seat occupant is protected. Performance is not enough.

  An object of the present invention is to provide a rear-seat airbag and a rear-seat airbag device that have higher protection performance for a rear-seat occupant.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a rear seat airbag that expands and inflates from the lower part of the front seat to the back side of the backrest part of the front seat, and extends along the back surface of the backrest part. The front expansion part that expands and expands upward, the rear expansion part that expands and expands backward from the front end side of the front expansion part, and the rear expansion part so as to cover the upper part of the thigh of the rear seat occupant In addition, there is provided a restraining means for restraining the rear inflating portion with respect to the front inflating portion.

  Therefore, according to the first aspect of the present invention, when the airbag is deployed and inflated, the front inflatable portion is deployed and inflated from the lower part of the front seat to above the knee of the rear seat occupant, and then from the front end side of the front inflatable portion. The rear expansion portion expands and expands rearward. At this time, the restraint means restricts the deployed and expanded position of the rear inflatable part, and the constraining means is disposed at a position that covers the upper part of the thigh of the rear seat occupant. For this reason, a rear side expansion | swelling part can be expand | deployed and expanded between a chest part and a backrest part of a backseat passenger | crew. Therefore, when a sudden forward acceleration is applied to the rear seat occupant due to a rear-end collision with another vehicle, the rear inflating portion in which the chest of the rear seat occupant moving forward from the rear seat abuts the back of the backrest portion Is effectively received. Further, when the upper body tilts forward, the head that moves forward and downward is effectively received by the rear inflating portion that abuts both legs or the backrest.

  The invention according to claim 2 is the invention according to claim 1, wherein the restraining means is a connection member that connects the front expansion portion and the rear expansion portion at the left and right positions outside thereof. And

  Therefore, according to the second aspect of the present invention, the connecting member that connects the front inflating portion and the rear inflating portion at the left and right positions outside thereof restrains the rear inflating portion to the front inflating portion, and A rear expansion part is arranged at a position covering the upper part of the thigh. For this reason, a simple structure is sufficient compared with the case where the connection member for restraining a rear side expansion part to a front side expansion part is provided in the inside of an airbag.

  According to a third aspect of the present invention, in the second aspect of the present invention, the connection member is connected to the front expansion portion and the rear expansion portion with a predetermined length in each deployment and expansion direction. It is a cloth-like material.

  Therefore, according to the third aspect of the present invention, the cloth-like material connected to the front expansion portion and the rear expansion portion with a predetermined length in each of the expansion and expansion directions has the front expansion portion. The rear inflatable part is disposed at a position that covers the upper part of the thigh of the rear seat occupant.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the cloth-like material is provided on both outer sides of both legs of the rear seat occupant.
Therefore, according to the fourth aspect of the present invention, the pair of cloth-like materials that restrain the rear inflating portion to the front inflating portion do not interfere with both legs of the rear seat occupant. It can be placed at a position closer to the thigh. For this reason, the protection performance with respect to the rear seat occupant can be improved more reliably.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the rear side expansion portion expands and expands in a substantially flat shape, and a thickness direction thereof is a substantially vertical direction. It arrange | positions so that it may become.

  Therefore, according to the fifth aspect of the present invention, the rear inflatable portion that expands and expands in a substantially flat shape is placed on the upper part of the thigh of the rear seat occupant with the thickness direction thereof being substantially vertical. Be placed. For this reason, when the upper body of the rear seat occupant falls forward due to the acceleration applied in the forward direction, the head of the rear seat occupant is effectively received by the flat upper surface of the rear inflating portion.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the case containing the airbag and the inflator is provided on the seat portion of the front seat or below the seat portion. 5. A rear seat airbag device that is disposed and operates the inflator based on an impact applied to a vehicle to deploy and inflate the airbag, wherein the airbag is any one of claims 1 to 4. The backseat airbag described in 1. is used.

  It is possible to provide a rear seat airbag and a rear seat airbag device having higher protection performance for the rear seat occupant.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, an airbag module 10 as an airbag device for a rear seat of the present embodiment is fixed to the lower surface of a seat portion 12 of a front seat 11 provided in a vehicle and is seated on a rear seat 13. The seat occupant 14 is protected. As shown in FIG. 2, the airbag module 10 is configured by housing a folded airbag 16 and an inflator 17 that supplies gas to the airbag 16 in a case 15 fixed to the seat portion 12. Has been.

  The airbag 16 includes a front inflating portion 19 that expands and expands upward along the back surface of the backrest portion 18 of the front seat 11 between the front seat 11 and the rear seat 13, and a front end side of the front inflating portion 19. And a rear expansion portion 20 that expands and expands rearward from the rear. The front inflating portion 19 is expanded and inflated upward from below the seat portion 12 along the back surface of the backrest portion 18, and at a position corresponding to a range from below the knee 21 of the rear seat occupant 14 to substantially the height of the chest portion 22. Be placed. The rear inflating portion 20 is deployed and inflated substantially rearward from the front end portion of the front inflating portion 19 so as to be substantially flat, and in a range corresponding to the chest 22 from the knee 21 of the rear seat occupant 14 to the upper portion of the thigh 32. Be placed. The airbag 16 is formed by stitching a front base fabric 23 and a rear base fabric 24 together.

  As shown in FIG. 3, the front base fabric 23 includes a first portion 23a having a rectangular shape in the center, a pair of second portions 23b provided on both long sides of the left and right sides of the first portion 23a, and a first portion It consists of a third part 23c provided on one (rear side) of both short sides of the part 23a and a fourth part 23d provided on the other (front side) of both short sides. The first portion 23 a forms the front surface of the front expansion portion 19 and the upper surface of the rear expansion portion 20 that are expanded and inflated. The pair of second portions 23 b form the left and right side surfaces of the front side expansion portion 19 and the rear side expansion portion 20. The third part 23 c forms the rear surface of the rear inflating part 20. The fourth portion 23 d forms the front surface of the portion that houses the inflator 17. In each of the left and right second portions 23b, cut portions 25 for bending the rear expansion portion 20 with respect to the front expansion portion 19 are provided at the boundary between the front expansion portion 19 and the rear expansion portion 20, respectively. Yes. As shown in FIGS. 4A and 4B, each of the left and right cut portions 25 has a front base serving as a boundary between the front expansion portion 19 and the rear expansion portion 20 by stitching the sides 25a together. Knob portions are formed on both sides of the center portion of the cloth 23 in the front-rear direction. The fourth portion 23d is provided with a hole 26 for inserting the inflator 17 into the airbag 16.

  The rear base fabric 24 has a rectangular fifth portion 24 a that forms the rear surface of the front inflatable portion 19 and the lower surface of the rear inflatable portion 20, and a sixth portion that is sewn together with the fourth portion 23 d of the front inflatable portion 19. 24b. The front base fabric 23 and the rear base fabric 24 are sewn into a bag shape along the seam lines 27a and 27b shown in FIG.

  As shown in FIG. 2, the front base fabric 23 and the rear base fabric 24 include a first tether 28 a provided on the base end side of the front expansion portion 19, a front expansion portion 19, and a rear expansion portion 20. The second tether 28b provided at the boundary portion and the third tether 28c provided at substantially the center position of the rear inflating portion 20 are connected inside the airbag 16. Accordingly, the thickness of the airbag 16 is defined by the first tether 28a to the third tether 28c. As shown in FIG. 5, the second tether 28b is provided at the center in the width direction of the airbag 16, and forms a passage for allowing gas to pass outwardly on both sides thereof. The other tethers 28a and 28c are formed in the same manner as the second tether 28b, and guide the gas from the inflator 17 backward.

  As shown in FIGS. 1, 2, 4, and 5, the airbag 16 is provided with two pairs of left and right reinforcing cloths 29 </ b> R and 29 </ b> L that connect the front inflating portion 19 and the rear inflating portion 20 outside. Yes. As shown in FIG. 3, the reinforcing cloths 29 </ b> R and 29 </ b> L are right-angled triangles, and are sewn together by stitches between the second parts 23 b of the front base cloth 23 and the fifth parts 24 a of the rear base cloth 24. . In FIG. 3, a plurality of reinforcing cloths 29R and 29L are shown corresponding to the sewing positions with respect to the front base cloth 23 and the rear base cloth 24. Provided. At this time, the reinforcing cloths 29R and 29L are sewn so that the respective vertexes V (the right-angled corners) coincide with the end positions where the cut portions 25 of the second portions 23b of the front base cloth 23 are stitched together. It is done. In other words, the reinforcing cloths 29R and 29L are joined to the front expansion part 19 and the rear expansion part 20 so as to follow the respective expansion and expansion directions. Further, as shown in FIGS. 1 and 5, the reinforcing cloths 29 </ b> R and 29 </ b> L are spaced apart from both sides of the legs 30 of the rear seat occupant 14. The reinforcing cloths 29R and 29L are arranged so that when the airbag 16 is inflated and inflated, the front inflating portion 19 is inflated upward from below the seat portion 12 of the front seat 11, and then from the front end side of the front inflating portion 19. The rear inflatable portion 20 is constrained to the front inflatable portion 19 so as to cover the upper portion of the thigh 32 from the knee 21 of the rear seat occupant 14 to the rear inflatable portion 20 that is deployed and inflated. In this embodiment, each reinforcing cloth 29R, 29L is a restraining means, a connecting member, and a cloth-like material.

Next, the operation of the present embodiment configured as described above will be described.
For example, when the inflator 17 is ignited by an impact caused by a frontal collision with another vehicle and gas is supplied from the inflator 17 to the airbag 16, the airbag 16 jumps out of the case 15 and is placed on the back side of the backrest portion 18 of the front seat 11. Expand and expand. At this time, in the airbag 16, first, the front inflating portion 19 is deployed and inflated upward from below the seat portion 12 of the front seat 11, and is disposed between the backrest portion 18 and the knee 21 of the rear seat occupant 14. .

  Following the expansion of the front expansion part 19, the rear expansion part 20 expands and expands from the front end side of the front expansion part 19. At this time, the left and right sides of the rear inflatable portion 20 are restrained by the left and right sides of the front inflatable portion 19 by the two pairs of left and right reinforcing cloths 29R and 29L so as to be along the upper portion of the thigh 32 of the rear seat occupant 14. Expands and expands in a bent state. Further, the front side inflating part 19 and the rear side inflating part 20 are bent without being greatly bent by a pair of left and right knobs provided on the front side base cloth 23, and the rear side inflating part 20 extends from the front end side of the front side inflating part 19. It expands and expands so as to extend rearward. As a result, the substantially flat rear-side inflatable portion 20 is disposed between the chest portion 22 of the rear seat occupant 14 and the backrest portion 18 of the front seat 11 in a state where the thickness direction is substantially vertical. The

  When the rear seat occupant 14 moves forward from the rear seat 13 due to inertia in this state, first, as shown in FIG. 6, the knee 21 is received by the rear surface of the front expansion portion 19, and the impact applied to the knee 21 is absorbed. The Subsequently, the chest 22 of the rear seat occupant 14 is received by the rear surface of the rear inflating portion 20, and the impact applied to the chest 22 is absorbed. Furthermore, as shown in FIG. 7, when the upper body of the rear seat occupant 14 falls forward, the head 31 is received by the upper surface of the substantially flat rear-side inflatable portion 20, and the impact applied to the head 31 is absorbed.

Therefore, according to this embodiment, the following effects can be obtained.
(1) A front-side inflating portion 19 that expands and inflates the airbag 16 upward along the back surface of the backrest portion 18 of the front seat 11, and a rear-side inflating portion 20 that inflates and expands from the front end side of the front-side inflating portion 19. Consists of. Further, outside the airbag 16, the left and right two parts that restrain the rear inflatable portion 20 to the front inflatable portion 19 so as to cover the rear inflatable portion 20 from the knee 21 of the rear seat occupant 14 to the upper portion of the thigh 32. A pair of reinforcing cloths 29R and 29L were provided. For this reason, when the rear seat occupant 14 moves forward from the rear seat 13 due to a rapid forward acceleration, the rear inflatable portion 20 that expands and expands between the chest 22 and the backrest portion 18 of the rear seat occupant 14, The rear seat occupant 14 is effectively received.

  (2) Then, the rear inflatable portion 20 is disposed in a range from the knee 21 of the rear seat occupant 14 to the upper portion of the thigh 32 by the action of the reinforcing cloths 29R and 29L. When the upper body of the rear seat occupant 14 falls forward due to the forward acceleration, the head 31 of the rear seat occupant 14 is effectively received.

  (3) The reinforcing cloths 29R and 29L are provided on both sides of the legs 30 of the rear seat occupant 14. For this reason, when the rear inflating portion 20 is deployed and inflated, the reinforcing cloths 29R and 29L do not interfere with both legs 30 of the rear seat occupant 14, and therefore the rear inflatable portion 20 is placed at a lower position closer to the rear seat occupant 14. Can be arranged. Therefore, the protection performance for the rear seat occupant 14 can be improved more reliably.

This embodiment can also be embodied as follows.
In the embodiment, instead of the reinforcing cloths 29R and 29L, a pair of left and right or two pairs of strings or bands that sew both ends to the rear inflatable portion 20 and the front inflatable portion 19 to restrain the rear inflatable portion 20 are used. Use the provided structure.

  -In the said embodiment, it shall be set as the structure which provided the vent hole in the rear side expansion part 20. FIG. For this reason, the internal pressure of the rear side expansion part 20 becomes lower than the internal pressure of the front side expansion part 19, and the head 31 of the rear seat occupant 14 is received softer.

The side view which shows the airbag apparatus for rear seats of this embodiment. The longitudinal cross-sectional view which shows the airbag apparatus for rear seats. (A) is a front view which shows a front side base fabric, (b) is a front view which shows a back side base fabric. (A) is a longitudinal cross-sectional view of the side part of a front side expansion part, (b) is a side view of the airbag which shows a notch part. AA sectional view taken on the line in FIG. The side view which shows the airbag for backseats at the time of an action | operation. The side view which shows the airbag for backseats at the time of an action | operation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Airbag module as a backseat airbag apparatus, 11 ... Front seat, 12 ... (Front seat) seat part, 13 ... Rear seat, 14 ... Rear seat passenger, 15 ... Case, 16 ... Air bag, 17 Inflator, 18 ... (front seat) backrest part, 19 ... front side inflating part, 20 ... rear side inflating part, 29R, 29L ... restraining means, connecting member and reinforcing cloth as cloth material, 30 ... leg, 32 ... femur.

Claims (6)

A rear seat airbag that expands and inflates from the lower portion of the front seat to the back side of the backrest portion of the front seat,
A front expansion portion that expands and expands upward along the back surface of the backrest portion;
A rear side inflating part that expands and inflates backward from the front end side of the front side inflating part;
A rear seat airbag comprising a restraining means for restraining the rear inflatable portion against the front inflatable portion so that the rear inflatable portion covers an upper part of a thigh of a rear seat occupant. .   2. The rear seat airbag according to claim 1, wherein the restraining means is a connection member that connects the front inflatable portion and the rear inflatable portion at the left and right positions outside thereof.   3. The rear seat air according to claim 2, wherein the connection member is a cloth-like material connected to the front-side expansion portion and the rear-side expansion portion so as to follow the respective expansion and expansion directions. bag.   The airbag for a rear seat according to claim 3, wherein the cloth-like material is provided on both outer sides of both legs of the rear seat occupant.   The said back side expansion | swelling part expand | deploys and expands in substantially flat shape, and it arrange | positions so that the thickness direction may turn into a substantially perpendicular direction, The Claim 1 characterized by the above-mentioned. Rear seat airbag. A rear seat air in which a case containing an airbag and an inflator is disposed on the seat portion of the front seat or below the seat portion, operates the inflator based on an impact applied to the vehicle, and deploys and inflates the airbag. A bag device,
A backseat airbag device using the backseat airbag according to any one of claims 1 to 5 as the airbag.

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