JP6801379B2 - Rear seat airbag - Google Patents

Description

The present invention relates to a rear seat airbag for restraining a rear seat occupant of an automobile.

As a rear seat airbag for restraining a rear seat occupant, WO2016 / 064936A1 describes a rear seat airbag that expands so that the side view shape becomes a U shape or an inverted U shape.

WO2014 / 016432A1 describes a rear seat airbag that expands so that the side view shape becomes a dogleg shape.

International Publication No. 2016/064936 International Publication No. 2014/016432

An object of the present invention is to provide a rear seat airbag that rapidly expands and deploys from the roof to the vehicle interior.

It is an object of the present invention to provide a rear seat airbag in which the rearward swing of the inflated rear seat airbag is suppressed in one aspect thereof.

The rear-seat airbag of the present invention is a folded rear-seat airbag that inflates in front of the rear-seat occupant by gas from the inflator. The rear-seat airbag is provided on the back panel on the occupant side. It has a front panel on the anti-occupant side, and the peripheral edges of the front panel and the back panel are connected to each other, and the front panel and the back panel are connected by a plurality of connecting portions in the middle portion in the width direction. The rear seat airbag is folded along a plurality of lateral fold lines extending in the left-right direction, and at least a part of the joints are separated from the lateral fold lines. It is characterized by that.

In one aspect of the present invention, the rear seat airbag has a first chamber that expands along the ceiling of the passenger compartment due to gas from the inflator, and a first chamber that expands downward and rearward from the rear portion of the first chamber. It has two chambers and a third chamber that is connected to the lower part of the second chamber and expands forward, and the front panel is a lower surface side of the first chamber, a front side of the second chamber, and a second chamber. The upper surface side of the three chambers is formed, and the back panel constitutes the upper surface side of the first chamber, the rear surface side of the second chamber, and the lower surface side of the third chamber, and the front panel and the back panel are , At the boundary between the first chamber and the second chamber, a plurality of first joints are connected, and the first joints are arranged at intervals in the left-right direction of the rear airbag. , The first joint is separated from the lateral fold line.

In one aspect of the present invention, the proximal end side of the rear seat airbag including the first chamber is bellows-folded along the lateral fold line.

In one aspect of the present invention, the distal end side of the rear seat airbag including the third chamber is bellows-folded along the lateral fold line.

In one aspect of the present invention, the rear seat airbag is roll-folded along a lateral fold line between the bellows-folded portions on the proximal end side and the distal end side.

In one aspect of the present invention, the left and right corners of the tip of the rear seat airbag on the third chamber side have a left diagonal fold line diagonally intersecting the tip and side of the rear airbag, respectively. It is folded along the diagonal fold line on the right side.

In one aspect of the present invention, the first coupling portion is annular, and one end of the first tether is coupled to the inside of the first coupling portion.

In one aspect of the present invention, the rear seat airbag is folded back along the vertical fold line, and the first joint portion is separated from the vertical fold line.

In one aspect of the present invention, the rear seat airbag is folded along the left vertical fold line and the right vertical fold line, and the first joint portion is folded along the left vertical fold line and the right vertical fold line. It is located between the line.

In one aspect of the present invention, the front panel and the back panel are connected by an annular second joint at the boundary between the second chamber and the third chamber, and the second joint is a rear seat. The airbags are arranged at intervals in the left-right direction, and one end of the second tether is coupled to the inside of the annular second coupling portion.

In one aspect of the present invention, a vent hole is provided at the tip or an intermediate portion of the rear seat airbag in the expansion direction.

The rear seat airbag of the present invention has a first chamber that expands along the ceiling of the passenger compartment, a second chamber that expands downward and rearward from the rear of the first chamber, and a lower portion of the second chamber. It has a third chamber that expands forward. In the event of a vehicle collision, the second chamber restrains the vicinity of the occupant's head, and the second and third chambers restrain the upper body such as the occupant's chest.

In the rear seat airbag of the present invention, the front portion of the airbag hits the front seat, so that the forward movement of the inflated rear seat airbag is suppressed.

In the rear seat airbag of the present invention, at the boundary between the first chamber and the second chamber, a plurality of first connecting portions for connecting the front panel and the back panel are provided at intervals in the left-right direction. Has been done. The rear seat airbag of the present invention is folded along a plurality of lateral folding lines.

This lateral fold line is separated from the first joint portion of the boundary portion between the first chamber and the second chamber, and does not overlap with the first joint portion. When the rear seat airbag of the present invention expands, the gas from the inflator expands the first chamber, and the gas from the first chamber is between the first joints, and the first joint and the rear seat air. It flows into the second chamber through the side of the bag, the second chamber expands, and subsequently the third chamber expands.

As described above, since the first joint does not overlap the lateral fold line, when the gas from the inflator expands the first chamber and further flows near the first joint, the first joints are connected to each other. The front panel and the back panel are quickly separated from each other and the gas passes between the first joint and the side of the rear airbag. As a result, gas flows smoothly from the first chamber to the second chamber, and the second chamber expands quickly.

In one aspect of the present invention, the base end side of the rear seat airbag is bellows-folded by a lateral fold line. When the base end side is expanded by the gas from the inflator, the thickness of the first and second chambers is rapidly increased, the vehicle ceiling is pushed open, and the rear seat airbag is quickly deployed in the vehicle interior.

In one aspect of the present invention, the third chamber side of the rear seat airbag is bellows-folded along the lateral fold line. Therefore, the third chamber rapidly expands from the lower part of the second chamber toward the front.

In one aspect of the present invention, the left and right corners of the tip of the rear seat airbag on the third chamber side are folded back along diagonal fold lines.

In the third chamber in which the left and right corners on the tip side are folded diagonally in this way, when the gas from the second chamber expands and expands forward from the lower part of the second chamber, the gas from the second chamber is centered on the tip side of the third chamber. The portion is inflated so as to abut against the rear surface of the front seat, and then the left and right corner portions on the tip side of the third chamber are inflated. Therefore, the third chamber expands and expands to the left and right in a well-balanced manner, and the airbag stabilizes at an early stage.

In one aspect of the present invention, the rear seat airbag is folded along the horizontal fold line and then folded back along the vertical fold line. By preventing the vertical fold line from overlapping the first joint, gas smoothly flows from the first chamber to the second chamber immediately after the start of expansion of the rear seat airbag, and the second chamber expands quickly. ..

It is a side view seen from the right side of the vehicle body which shows the state at the time of expansion of the rear seat airbag which concerns on embodiment. (A) is a plan view of the rear seat airbag in a flatly spread state, (B) is an enlarged cross-sectional view of the inflated rear seat airbag along line (A) BB. It is a top view which shows the folding method of the rear seat airbag. (A) is a plan view showing a method of folding the rear seat airbag, and (B) is a sectional view taken along line BB of FIG. (A). (A) is a plan view showing a method of folding the rear seat airbag, and (B) is a sectional view taken along line BB of FIG. (A). (A) is a plan view showing a method of folding the rear seat airbag, and (B) is a sectional view taken along line BB of FIG. (A). (A) is a plan view showing a method of folding the rear seat airbag, and (B) is a sectional view taken along line BB of FIG. (A). (A) is a plan view showing how to fold the rear seat airbag, (B) is a sectional view taken along line BB in FIG. It is a figure. (A) is a plan view showing how to fold the rear seat airbag, (B) is an end view of the cut portion along the line BB in (A), and (C) is C in FIG. -C arrow view. (A) is a plan view of a rear seat airbag according to another embodiment, and (B) is a vertical sectional view of a central portion of the foldable body. It is a front-rear direction longitudinal sectional view at the time of expansion of the rear seat airbag which concerns on another embodiment. It is a side view seen from the right side of the vehicle body which shows the state at the time of expansion of the rear seat airbag which concerns on another embodiment. It is a side view seen from the right side of the vehicle body which shows the state at the time of expansion of the rear seat airbag which concerns on another embodiment. It is a side view of the rear seat airbag.

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

[First Embodiment]
1 to 9 show the rear seat airbag 1 according to the first embodiment of the present invention. As shown in FIG. 1, the rear seat airbag 1 expands downward, downward and rearward from the ceiling portion 4 of the vehicle between the front seat 2 and the rear seat 3 of the automobile to restrain the occupant M of the rear seat 3. It is for doing.

The rear seat airbag 1 includes a first chamber 21 that expands along the ceiling portion 4, a second chamber 22 that expands downward and rearward from the rear portion of the first chamber 21, and the second chamber 22. It has a third chamber 23 that is connected to the lower part and expands forward.

As shown in FIG. 2B, the rear seat airbag 1 is composed of a substantially rectangular bag in which the peripheral edges of the substantially rectangular front panel 5 and the back panel 6 are sutured with sutures 7.

One end of the cylinder type inflator 8 is inserted from the side into the upper part of the rear seat airbag 1. A stud bolt (not shown) is projected from the inflator 8. The stud bolt penetrates a small hole (not shown) of the back panel 6 and is attached to a retainer or a vehicle body member (not shown) of the rear seat airbag device with a nut.

A projecting piece portion 9 is projected from the base end F side of the rear seat airbag 1. A bolt (not shown) is inserted into a small hole 9a provided in the projecting piece portion 9, and the bolt is fastened to a retainer or a vehicle body member with a nut. The rear seat airbag 1 is attached to the retainer or the vehicle body member by these stud bolts and bolts.

The rear seat airbag 1 has a substantially rectangular shape that is long in the vertical direction in FIG. 2A, and a first joint portion 11 and a second joint portion 12 are provided in the middle of the longitudinal direction. The first joint portion 11 and the second joint portion 12 are made of sutures (seam) extending in an annular shape, and as shown in FIG. 2B, the front panel 5 and the back panel 6 are sewn together. .. The first joint portion 11 is located on the base end F side of the rear seat airbag 1 in the longitudinal direction intermediate portion. The second coupling portion 12 is located approximately in the middle of the longitudinal direction of the rear seat airbag 1, that is, the direction connecting the base end F side and the tip end E side. In this embodiment, three first coupling portions 11 and three second coupling portions 12 are provided, and the first coupling portion 11 and the second coupling portion 12 are arranged at equal intervals in the left-right width direction of the rear seat airbag 1.

The first chamber 21 is between the base end F side of the rear seat airbag 1 and the first coupling portion 11, and the second chamber 22 is between the first coupling portion 11 and the second coupling portion 12. The tip E side of the second coupling portion 12 is the third chamber 23.

The first chamber 21 and the second chamber 22 communicate with each other via a portion between the first coupling portions 11 and a portion between the first coupling 11 and the left and right side sides of the rear seat airbag 1. There is. The second chamber 22 and the third chamber 23 communicate with each other via a portion between the second coupling portions 12 and a portion between the second coupling portion 12 and the left and right side sides of the rear seat airbag 1. ing.

In this embodiment, as shown in FIG. 2, three vertical stitches 16 extending from the first joint portion 11 through the second joint portion 12 to the vicinity of the tip E are provided, and each vertical stitch is sewn. The space between the eyes 16 and the space between the vertical seam 16 and the left and right side sides of the rear seat airbag 1 are vertically long small chambers, respectively. In addition, in FIGS. 3 to 9, the vertical stitch 16 is not shown.

In this embodiment, one end of the first tether 31 (FIG. 1) is sewn on the left and right first joints 11, and one end of the second tether 32 is sewn on the left and right second joints 12. It is sewn. Further, one end of the third tether 33 is sewn to the sewn portion 13 between the second joint portion 12 and the tip E side, and one end of the fourth tether 34 is sewn to the sewn portion 14 on the tip E side. It is sewn.

As shown in FIG. 1, the other ends of the first, second and fourth tethers 31, 32 and 34 are connected to a retainer or a vehicle body member in front of the first chamber 21. The other end of the third tether 33 is sewn near the base end F of the rear seat airbag 1.

A vent hole is provided at the tip of the third chamber 23 in the expansion direction, that is, on the upper surface (near the vicinity indicated by the arrow S) near the front end of the third chamber 23. The number of vent holes is one or more.

A method of folding the rear seat airbag 1 will be described with reference to FIGS. 3 to 9.

As shown in FIG. 3, the rear seat airbag 1 is placed flat on the upper surface of a flat workbench. Right and left corner portions 1c of the rear tip E side of the seat airbag 1 folded back 1c diagonal fold line L _1, the airbag 1 the rear seat along the L ₂ to the center side and the front panel 5 side. The folding lines L ₁ and L ₂ are oblique to the front end side and the side side of the rear seat airbag 1, respectively.

In this embodiment, as shown in FIG. 3, the corner portions 1c and 1c are folded back so as to abut each other, but the two may be separated from each other.

Next, as shown in FIG. 4, the tip E side of the rear seat airbag 1 is folded back toward the front panel 5 side along the left-right fold line (horizontal fold line) M ₁ . Next, as shown in FIGS. 5 and 6, the rear seat airbag 1 is sequentially folded from the tip E side along the horizontal fold lines M ₂ , M ₃ , M ₄ , M ₅ , M ₆ , and M _7. Then, the primary folding body J is formed.

After that, as shown in FIG. 7, the primary folding body J is folded back in a roll shape along the lateral folding line M ₈ toward the back panel side to surround the primary folding body J.

Thereafter, the base end F side from the transverse fold line M ₈ are sequentially bellows-folded along a transverse fold line M _9, M ₁₀ to the secondary folded body and shown in FIG. 8. As shown in FIG. 8B, in this secondary foldable body, the first joint portion 11 is located between the lateral fold lines M ₉ and M ₁₀ and does not overlap with them.

Then, as in FIG. 9, folding the secondary folded body left and along the longitudinal fold lines V _1, V ₂ of the right side to the primary folded bodies J side. As a result, the rear seat airbag 1 has a final folding shape, and thus the shape is retained by hanging a shape-retaining band (not shown). After that, the inflator 8 is inserted into the rear seat airbag 1.

As Figure 7, the first coupling portion 11, the longitudinal fold lines _V 1, _{V 2} located between the adjacent, longitudinal fold line _V 1, _{V 2} and do not overlap.

The rear seat airbag device having the rear seat airbag 1 folded in this way is arranged in the ceiling portion 4, and the other ends of the first, second and fourth tethers 31, 32 and 34 are the first. It is connected to a retainer or a vehicle body member in front of one chamber 21 and covered with a roof garnish.

At the time of a vehicle collision, the inflator 8 operates to eject gas, and the rear seat airbag 1 expands. As shown in FIG. 1, the first chamber 21 expands along the ceiling portion 4, and the second chamber 22 expands obliquely downward and rearward from the rear end of the first chamber 21. The third chamber 23 expands forward from the lower end of the second chamber 22. The front end of the third chamber 23 abuts on the rear surface of the front seat 2. The rear seat airbag 1 bends at the first joint portion 11 and the second joint portion 12.

By pulling the first and second connecting portions 11 and 12, respectively, by the first tether 31 and the second tether 32, the lower part of the second chamber 22 expands from the chest of the rear seat occupant M to the position along the front surface of the head. .. At this time, the second chamber 22 is tilted so as to be forward toward the upper side, and the third chamber 32 is slightly tilted so as to be substantially horizontal or downward toward the front.

The chest to head of the rear seat occupant M are restrained by the rear seat airbag 1 inflated in this way. Since the second chamber 22 is widely deployed in a substantially flat shape in front of the head, the receiving area for receiving the head of the occupant M is large.

Further, the front end of the third chamber 23 of the rear seat airbag 1 expanded in this way comes into contact with the rear surface of the front seat 2, so that the forward movement of the second chamber 22 and the third chamber 23 is suppressed.

In this embodiment, since the first coupling portion 11 is located between the lateral folding lines M ₉ and M ₁₀ and does not overlap with each other, the gas from the inflator 8 is released at the initial stage of expansion of the rear seat airbag 1. It is easy to flow into each chamber partitioned by the longitudinal seam 16, gas smoothly flows from the first chamber 21 to the second chamber 22, and the thickness of the second chamber 22 is rapidly increased following the first chamber 21. To do. Therefore, the rear seat airbag 1 quickly breaks the roof garnish tear line and deploys in the vehicle interior.

In particular, in this embodiment, the vertical fold lines V ₁ and V ₂ do not overlap the first joint portion 11, and in addition, the base end F side of the rear seat airbag 1 is the horizontal fold lines M _{8 to} M. _{Since the} bellows are folded by ₁₀ , the upper portions of the first chamber 21 and the second chamber 22 expand downward. As a result, the rear seat airbag 1 quickly breaks the roof garnish tear line and quickly deploys in the vehicle interior.

Further, in this embodiment, since the third chamber 23 portion is bellows-folded, the third chamber 23 quickly expands and expands from the lower part of the second chamber 22 toward the rear surface of the front seat.

Further, in this embodiment, since the left and right corner portions 1c and 1c of the third chamber 23 are diagonally folded back, the gas flowing into the third chamber 23 from the second chamber 22 is left and right on the tip E side. Concentrate near the center of the direction, the center of the tip E side of the third chamber 23 is expanded at an early stage, and then the left and right corner portions 1c and 1c are expanded. Therefore, the second chamber 23 expands to the left and right in a well-balanced manner.

[Second Embodiment]
In the first embodiment, the tip end side of the cylinder-shaped inflator 8 is inserted into the rear seat airbag 1 from the side of the rear seat airbag 1, but the rear seat airbag of FIG. An L-shaped gas pipe 40 may be provided at the tip of the inflator 8 as in 1', and the tip of the gas pipe 40 may be inserted into the rear seat airbag 1'. Other configurations of the rear seat airbag 1'are the same as those of the rear seat airbag 1, and the same reference numerals indicate the same parts.

FIG. 10B shows a cross section of the folded body of the rear seat airbag 1'in the vehicle front-rear direction.

In the above embodiment, the inside of the rear seat airbag is divided into the first to third chambers, but the number of chambers may be 1, 2, or 4 or more.

As described above, the rear seat airbag of the present invention may be provided with a vent hole at the tip or an intermediate portion in the expansion direction.

FIG. 11 is a vertical sectional view in the front-rear direction showing an example of a rear seat airbag having a vent hole. The rear seat airbag 1A has a second chamber 21A, a second chamber 22A, and a coupling portion 11A located at a boundary between them. The first chamber 21A expands so as to extend downward and rearward from the vehicle ceiling. The second chamber 22A expands so as to extend forward from the lower end of the first chamber 21A.

An inflator 8 is provided at the upper end of the rear seat airbag 1A. One or more vent holes 41 are provided on the upper surface near the tip of the second chamber 22A.

The rear seat airbag 1A is provided with inner tether panels 42 and 44 that connect the front panel 5A and the back panel 6A. The inner tether panels 42 and 44 are provided in place of the vertical seam 16 described above. The inner tether panel 42 extends in the first chamber 21A from the vicinity of the upper end to the vicinity of the lower end. The inner tether panel 44 extends in the second chamber 22A from the vicinity of the rear end to the vicinity of the front end. Holes 43 and 45 are provided in the inner tether panels 42 and 44.

The rear seat airbag 1B of FIG. 12 has a first chamber 21B, a second chamber 22B, and a third chamber 23B. The first chamber 21B expands along the vehicle ceiling. The inflator 8 is installed in the first chamber 21B. The upper end of the second chamber 22B is connected to the rear end of the first chamber 21B via the first coupling portion 11B. The upper end of the third chamber 23B is connected to the front end of the first chamber 21B via the second coupling portion 12B. The second chamber 22B and the third chamber 23B extend obliquely so as to be rearward toward the lower side. The length in the expansion direction of the third chamber 23B, that is, the length from the upper end of the front portion to the lower end of the rear portion is larger than the length in the expansion direction of the second chamber 22B. The lower end of the second chamber 22B is connected to the upper surface of the intermediate portion of the third chamber 23B in the expansion direction by suturing or the like.

One or two or more vent holes 46, 47 are provided on the front surface of the expansion direction intermediate portion of the second chamber 22B and the lower surface of the expansion direction intermediate portion of the third chamber 23B, respectively.

The rear seat airbag 1C of FIG. 13 has a first chamber 21C, a second chamber 22C, and a third chamber 23C. The first chamber 21C expands along the vehicle ceiling. The inflator 8 is installed in the first chamber 21C. The upper end of the second chamber 22C is connected to the rear end of the first chamber 21C via the first coupling portion 11C. The upper end of the third chamber 23C is connected to the front end of the first chamber 21C via the second coupling portion 12C. The second chamber 22C and the third chamber 23C extend obliquely so as to be rearward toward the lower side. The rear end of the third chamber 23C is connected to the front surface of the intermediate portion of the second chamber 22C in the expansion direction by suture or the like.

One or more vent holes 48 are provided on the lower surface near the rear end of the third chamber 23C.

The rear seat airbag 1D of FIG. 14 is configured to expand diagonally rearward from the vehicle ceiling. An inflator 8 is provided along the upper surface of the rear seat airbag 1D. One or two or more vent holes (not shown) are provided in the middle of the front surface of the rear seat airbag 1D or near the lower end.

The above embodiment is an example of the present invention, and the present invention may be a form other than the above.

1,1', 1A ~ 1D Rear seat airbag 2 Front seat 3 Rear seat 4 Ceiling part 5 Front panel 6 Back panel 8 Inflator 11, 11A ~ 11C 1st joint part 12, 12B, 12C 2nd joint part 21, 21A-21C 1st chamber 22,22A-22C 2nd chamber 23,23B, 23C 3rd chamber 31 1st tether 32 2nd tether 33 3rd tether 41,46-48 Vent hole

Claims (10)

In a rear-seat airbag that is folded and inflated in front of the rear-seat occupants by gas from the inflator.
The rear seat airbag has a back panel on the occupant side and a front panel on the anti-occupant side.
The peripheral edges of the front panel and the back panel are connected to each other.
The front panel and the back panel are connected by a plurality of connecting portions in the middle portion in the width direction.
The rear seat airbag is folded along a plurality of lateral fold lines extending in the left-right direction.
At least some of the joints are separated from the lateral fold line .
A first chamber that expands along the ceiling of the passenger compartment due to gas from the inflator, and a second chamber that expands downward and backward from the rear of the first chamber.
A third chamber connected to the lower part of the second chamber and expanding forward,
Have,
The front panel constitutes the lower surface side of the first chamber, the front surface side of the second chamber, and the upper surface side of the third chamber.
The back panel constitutes the upper surface side of the first chamber, the rear surface side of the second chamber, and the lower surface side of the third chamber.
The front panel and the back panel are connected by a plurality of first coupling portions at the boundary between the first chamber and the second chamber.
The first joints are arranged at intervals in the left-right direction of the rear seat airbag.
The rear seat airbag is characterized in that the first joint portion is separated from the lateral folding line . The rear seat airbag according to claim 1 , wherein the proximal end side of the rear seat airbag including the first chamber is bellows-folded along the lateral folding line. The rear seat airbag according to claim 2 , wherein the tip end side of the rear seat airbag including the third chamber is bellows-folded along the lateral folding line. The rear seat airbag according to claim 3 , wherein the rear seat airbag is roll-folded along a lateral fold line between the bellows-folded portions on the base end side and the tip end side. bag. In any one of claims 1 to 4, the left and right corners of the tip of the rear seat airbag on the third chamber side are inclined with respect to the tip and side of the rear airbag, respectively. Rear-seat airbags that are folded along the intersecting left diagonal fold lines and right diagonal fold lines. In any one of claims 1 to 5 , the rear seat air is characterized in that the first coupling portion is annular and one end of the first tether is coupled to the inside of the annular coupling portion. bag. In any one of claims 1 to 5 , the rear seat airbag is folded back along a vertical fold line.
The rear seat airbag is characterized in that the first joint portion is separated from the vertical folding line. In claim 7 , the rear seat airbag is folded back along the left vertical fold line and the right vertical fold line.
The rear seat airbag is characterized in that the first joint portion is located between the left vertical fold line and the right vertical fold line. In any one of claims 1 to 8 , the front panel and the back panel are connected by an annular second coupling portion at a boundary portion between the second chamber and the third chamber.
The second joints are arranged at intervals in the left-right direction of the rear seat airbag.
A rear seat airbag characterized in that one end of a second tether is coupled to the inside of the annular second coupling portion. The rear seat airbag according to any one of claims 1 to 9 , wherein a vent hole is provided at the tip or an intermediate portion in the expansion direction.

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