JP4645374B2 - Passenger airbag - Google Patents

Description

  The present invention relates to an airbag for a top-mount type airbag device for a passenger seat that is disposed on the upper surface side of an instrument panel in front of a passenger seat.

Conventionally, an airbag for a passenger's seat has one gas inlet through which inflation gas flows in at a position on the lower surface near the front end when inflation is completed, and an assistant at a position on the rear side when inflation is completed. Two inflatable portions that are configured to include an occupant protection portion that can interfere with an occupant seated in the seat, and the occupant protection portions are juxtaposed along the left-right direction and communicated with each other in the vicinity of the gas inlet From the above, there is a configuration (see, for example, Patent Document 1). In the conventional passenger seat airbag, the two left and right inflatable portions are connected by a connecting panel disposed on the rear end side along the left and right directions when the inflation is completed, and the occupant is received by the connecting panel. there were.
JP2003-335203A (FIGS. 17 to 28)

  However, in the conventional passenger seat airbag, the two left and right inflatable parts constituting the occupant protection part are communicated with each other only in a small area near the gas inlet, so that the occupant protection part is removed from the inflator. When inflating by inflating the inflation gas, the left and right inflatable parts could not be inflated evenly, and the connection panel was inclined, and there was a possibility that the occupant approaching could not be protected accurately. .

  The present invention solves the above-mentioned problems, and can be used for passenger seats that can inflate the left and right two projecting parts constituting the occupant protection part evenly and can accurately protect the occupant approaching. An object is to provide an airbag.

An airbag for a passenger seat according to the present invention is folded and housed on the upper surface side of an instrument panel in front of a passenger seat of a vehicle, and protrudes upward when an inflating gas flows in, and further includes an upper surface of the instrument panel and an instrument. It is configured to expand and expand to the rear side of the vehicle so as to block between the windshield above the panel,
Provided with a gas inlet for inflating gas into the position near the center in the left-right direction on the lower surface of the front end when the inflation is completed, and interferes with a passenger seated in the passenger seat at a position on the rear side when the inflation is completed In an airbag for a passenger seat configured to include an occupant protection portion that is made possible,
When the airbag is inflated, the shape of the airbag is a substantially quadrangular pyramid shape with the front end as the top, and the left and right side walls are arranged along the front-rear direction on both the left and right sides. An upper side wall portion and a lower side wall portion that are arranged substantially along the left-right direction, and a rear side wall portion that is arranged along the substantially left-right direction so as to connect the upper side wall portion and the lower side wall portion on the passenger side. And a configuration comprising:
When the airbag protection is completed,
Left and right shoulder restraint portions that are arranged side by side in the left-right direction and are arranged so as to protrude rearward so that they can interfere with the left and right shoulder portions of the occupant,
A recess disposed from the upper part to the rear part between the shoulder restraint parts,
It is configured with
The communication part that communicates the left and right shoulder restraints on the gas inlet side in the left-right direction indicates the opening area in the cross-section along the front-rear direction passing through the center of the gas inlet in the airbag at the time of completion of inflation. It is configured to be set to 1/5 or more of the projected area of the entire airbag viewed from the side,
Airbag curved, with are sewn bag is formed by sewing the peripheral edges of the base fabric of a predetermined shape, a first base fabric, each substantially C-shape so that the left right symmetrical to each other And two second base fabrics made into a belt-like shape,
The first base fabric constitutes the left side wall and the right side wall,
Each second base fabric constitutes the left and right halves of the upper side wall, the lower side wall, and the rear side wall, respectively.
The protruding top portion of the shoulder restraint portion is configured from the vicinity of the stitched site where the outer peripheral edge of the first base fabric and the outer peripheral side edge of the second base fabric are sewn together,
The tip of the recess is configured from the vicinity of the stitched portion where the inner peripheral edges of the second base fabric are sewn together.

  In the airbag for the passenger seat according to the present invention, the communicating portion that communicates the shoulder restraint portion as the left and right projecting portions on the gas inlet side in the left-right direction passes through the center of the gas inlet in the airbag when the inflation is completed. Since the opening area in the cross section along the line is set to be larger than 1/5 of the projected area of the entire airbag viewed from the side when the inflation is completed, the inflation gas passes through the communication portion. Thus, it is possible to suppress the one shoulder restraint portion from being biased and expand, and the left and right shoulder restraint portions can be inflated substantially uniformly and in a well-balanced manner. Incidentally, when the opening area of the communication portion is less than 1/5 of the projected area of the entire airbag, there is a possibility that only one shoulder restraint portion is unevenly expanded when the airbag is inflated.

  Therefore, in the passenger seat airbag of the present invention, the shoulder restraint portions as the two protruding portions constituting the occupant protection portion can be evenly inflated, and the occupant approaching can be protected accurately. .

  In the passenger seat airbag according to the present invention, the occupant protection portions are arranged side by side substantially along the left-right direction when the airbag is completely inflated, and are arranged so as to protrude rearward. It is the structure provided with the shoulder restraint part and the recessed part arrange | positioned from the upper part between shoulder restraint parts to the rear part. Therefore, in the passenger seat airbag according to the present invention, when the occupant interferes with the airbag when the inflation is completed, the left and right shoulder restraint portions arranged to protrude rearward are first It will interfere with the vicinity of the shoulder. Thereafter, the head of the occupant whose both shoulders are restrained by the shoulder restraining portions is restrained so as to suppress the forward movement while entering the recesses between the shoulder restraining portions. Therefore, the passenger's head can be softly received while suppressing the reaction force from the airbag. Further, in the passenger seat airbag of the present invention, the communication portion that constitutes the recess has an opening area of 1/5 or more of the projected area of the entire airbag viewed from the side when the inflation is completed, Since it is set large, the cushioning property of the recess is also good. Therefore, even if the occupant's head interferes with the recess, the occupant's head can be accurately protected by the recess. Further, in the airbag for a passenger seat according to the present invention, in the airbag when the inflation is completed, the recess is disposed from the upper part to the rear part between the shoulder restraint parts. Therefore, even if the position of the occupant's head that interferes with the inflated airbag moves up and down due to the physique and seating posture of the occupant, the reaction force from the airbag is suppressed by the recess, It can be received softly. In addition, in order to receive the occupant's head softly, the opening area of the communication part constituting the recess should be set to less than 4/5 of the projected area of the entire airbag viewed from the side when the inflation is completed. Is desirable.

Furthermore, in the passenger seat airbag according to the present invention , since the recesses are formed by stitching the inner peripheral side edges of the second base fabric, the length dimension of the stitched portion is changed. Accordingly, the shape of the concave portion between the left and right shoulder restraining portions can be deepened or shallowed, and at the same time, the opening area of the communication portion that communicates the left and right shoulder restraining portions can be changed. That is, the shape of the recess between the left and right shoulder restraint portions can be easily changed without changing the outer shape of the airbag.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, an airbag 15 for a passenger seat according to the embodiment has an upper surface 2 side of an instrument panel (hereinafter referred to as “instrument panel”) 1. Is used for a top-mount type airbag device M for a passenger seat disposed inside the vehicle. The passenger seat airbag apparatus M includes a folded airbag 15, an inflator 8 that supplies inflation gas to the airbag 15, a case 6 that stores and holds the airbag 15 and the inflator 8, and an airbag 15. A retainer 11 for attaching to the case 6 and an airbag cover 10 covering the folded airbag 15 are provided.

  In the present specification, the up / down, front / rear, and left / right directions correspond to the up / down, front / rear, and left / right directions of the vehicle in a straight traveling state of the vehicle.

  The airbag cover 10 is formed integrally with the instrument panel 1 made of synthetic resin, and is configured such that when the airbag 15 is deployed and inflated, the front and rear door portions 10a and 10b are pushed by the airbag 15 and opened. ing. Further, a connecting wall portion 10 c connected to the case 6 is formed around the door portions 10 a and 10 b of the airbag cover 10.

  The inflator 8 includes a substantially cylindrical main body portion 8 a having a plurality of gas discharge ports 8 b and a flange portion 8 c for attaching the inflator 8 to the case 6.

  The case 6 is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening on the upper end side, a substantially rectangular plate-like bottom wall portion 6a to which the inflator 8 is inserted from below and attached to the outside of the bottom wall portion 6a. And a peripheral wall portion 6b that extends upward from the periphery and engages the connecting wall portion 10c of the airbag cover 10. The case 6 is provided with a bracket (not shown) connected to the vehicle body side at the bottom wall 6a.

  The airbag 15 and the inflator 8 include a plurality of bolts 11a of an annular retainer 11 disposed in the airbag 15, and the airbag 15, the flange portion 8c of the inflator 8, and the case bottom wall portion 6a. , And the nut 12 is fixed to the case 6.

  As shown in FIGS. 2 to 5, the airbag 15 has a substantially quadrangular pyramid shape with the front end as a top when the inflation is completed, and an upper side wall 15 a that becomes the upper surface when the inflation is completed, and a lower surface side Lower side wall 15b, left and right side walls 15c and 15d on the left and right side surfaces, and rear side wall 15e on the rear side. The airbag 15 according to the embodiment includes an occupant protection unit 27 disposed on the rear side that is the occupant side when the inflation is completed, and the instrument panel 1 and the windshield 4 on the front side of the occupant protection unit 27 when the inflation is completed. A substantially cylindrical vehicle body side portion 16 closed between the front end sides disposed between the vehicle body side and the vehicle body side serving as the front end side of the lower side wall portion 15b of the airbag 15 when the inflation is completed A gas inlet 20 that is circularly opened to allow the inflation gas to flow into the portion 16 near the center in the left-right direction of the portion 16 and attaches the peripheral edge 19 to the case 6 is provided. A plurality of attachment holes 21 for attaching the inlet peripheral edge 19 to the bottom wall portion 6 a of the case 6 are formed in the peripheral edge 19 of the gas inlet 20 through the bolt 11 a of the retainer 11.

  The occupant protection part 27 is arranged between the shoulder restraint part 28 (28L / 28R) as a projecting part that is juxtaposed on the left and right sides and extends in the vertical direction, and between the left and right shoulder restraint parts 28L / 28R. And a recess 29 that is recessed from the rear to the rear. In the case of the embodiment, the raised state of the left and right shoulder restraining portions 28L and 28R and the depressed state of the recessed portion 29 are the regions from the rear side wall portion 15e of the airbag 15 to the upper and lower side wall portions 15a and 15b. It extends continuously to a portion near the gas inlet 20 of the vehicle body side portion 16 so as to extend to the inner front side, and is uneven at a portion of the lower panel portion 33 of the first base fabric 32 described later. The state is settled and is flat (see FIG. 2).

  In the case of the embodiment, as shown in FIG. 6, the airbag 15 is composed of one first base cloth 32 and two second base cloths 36 </ b> L and 36 </ b> R. The first base fabric 32 has a substantially rectangular lower panel portion 33 that forms a peripheral edge 19 of the gas inlet 20 in the vehicle body side portion 16 and a lower panel portion as a left-right symmetrical shape that approximates the shape of an open butterfly. The outer panel portions 34 </ b> L and 34 </ b> R having a substantially triangular plate shape disposed so as to extend from the right and left sides from the right side 33 are configured. The outer panel portions 34L and 34R mainly constitute the left and right side wall portions 15c and 15d of the airbag 15 that has been inflated. Moreover, the site | part which becomes the outer periphery 34a vicinity in each outer side panel part 34L * 34R will comprise the outer side wall part 28b arrange | positioned from the protrusion top part 28a in each shoulder restraint part 28 at the edge part side of the left-right direction. . In the case of the embodiment, the outer panel portions 34L and 34R are formed in line symmetry with a line passing through the center of the gas inlet 20 as a center line.

Each of the two second base fabrics 36L and 36R has a strip shape (flat plate shape) curved in a substantially C shape, and has a bilaterally symmetrical shape. In the case of the embodiment, each of the second base fabrics 36L and 37R is half left and right of the upper and rear side wall portions 15a and 15e and the rear side portion of the lower side wall portion 15b in the airbag 15 at the completion of the inflation. Is constituted. Each of the second base fabrics 36L and 36R constitutes an inner portion 28c disposed on the center side in the left-right direction with respect to the protruding top portion 28a of each shoulder restraining portion 28. In the case of the embodiment, each of the second base fabrics 36L and 36R has a shape on the outer edge portion 36d side, except for the base portion side edge portion 34b in the peripheral edge portion 34a of the outer panel portions 34L and 34R in the first base fabric 32. It is formed so as to be substantially the same as the shape of the part. The inner edge 36a formed on the inner peripheral side of the second base fabric 36 constitutes a tip 29a recessed into the airbag 15 of the recess 29, and communicates with the left and right shoulder restraining portions 28L and 28R. A peripheral edge of the communication hole 23 as a part is formed. In the embodiment, the first and second base fabrics 32, 36L, and 36R are formed of a flexible woven fabric made of polyester yarn, polyamide yarn, or the like, and do not apply a coating material such as silicon. It is configured as a non-coated cloth.

  The shoulder restraining portions 28L and 28R and the recess 29 in the occupant protection portion 27 are configured by sewing the peripheral edges of the outer panel portions 34L and 34R of the first base fabric 32 and the second base fabrics 36L and 36R. Yes. In the case of the embodiment, the vicinity of the stitched portion 30 formed by sewing the peripheral edge 34a of the first base fabric 32 and the outer edge portion 36d of the second base fabric 36 is the protruding top portion 28a of each shoulder restraint portion 28L / 28R. Will be constructed. The vicinity of the stitched portion 31 formed by sewing the inner edge portions 36a and 36a of the second base fabrics 36L and 36R constitutes the tip 29a of the recess 29.

  A communication portion (communication hole) 23 that communicates the shoulder restraining portions 28 </ b> L and 28 </ b> R in the left-right direction is disposed on the inner peripheral side of the airbag 15 at the concave end 29 a of the occupant protection portion 27. The communication hole 23 has a peripheral portion with a stitched portion 31 (tip 29a of the recessed portion 29) formed by sewing the inner edges 36a and 36a of the second base fabrics 36L and 36R with each other, and the first base fabric 32. In the case of the embodiment, it is disposed from the lower side of the occupant protection part 27 in the airbag 15 at the time of completion of the inflation to the lower side of the vehicle body side part 16. The communication hole 23 is arranged so that the opening surface is substantially along the front-rear direction at the approximate center in the left-right direction when the airbag 15 is inflated. As shown in FIG. The opening area S1 in a cross section along the front-rear direction passing through the approximate center of the gas inlet 20 in the airbag 15 is 1/5 or more of the projected area S2 of the entire airbag 15 as viewed from the side when the inflation is completed. Is set. In the case of the embodiment, the opening area S1 of the communication hole 23 is set to approximately ½ of the projected area S2 of the airbag 15 at the completion of the inflation. In addition, vent holes 24 for exhausting excess inflation gas are provided on the left and right side wall portions 15c and 15d of the airbag 15, respectively. In order to protect the occupant's head softly, it is desirable that the opening area S1 of the communication hole 23 is set to be less than 4/5 of the projected area S2 of the airbag 15 when the inflation is completed. When the opening area S1 of the communication hole 23 is 4/5 or more of the projected area S2 of the airbag 15 when the inflation is completed, the protruding amount of the shoulder restraining portions 28L and 28R (the recessed amount of the recessed portion 29) becomes relatively small. This is because the head of the occupant may not be protected softly.

  Next, manufacture of the airbag 15 of embodiment is demonstrated. First, the second base fabrics 36L and 36R are overlapped with each other, and the inner edge 36a is sewn using a suture thread. Next, the second base fabrics 36L and 36R are inverted so that the seam allowance of the inner edge portion 36a is not exposed, and each of the first base fabrics 32 arranged in series with the front side edge portion 33a of the lower panel portion 33 in the first base fabric 32. The front side edge 36b of the second base fabric 36 is sewn and the rear side edge 33b of the lower panel portion 33 in the first base fabric 32 and the second base fabric 36 arranged in series. The rear edge 36c is sewn. Then, the front and rear left and right edge portions 33c and 33d of the lower panel portion 33 are sewn to the base portion side edge portion 34b of the peripheral edge portion 34a of each of the adjacent outer panel portions 34L and 34R. Thereafter, the peripheral edge portions 34a of the outer panel portions 34L and 34R of the first base fabric 32 and the outer edge portions 36d of the corresponding second base fabrics 36L and 36R are sewn, and the seam allowance of the edge portions is exposed to the outside. If the gas inflow port 20 is reversed so as not to cause the air bag 15, the airbag 15 can be manufactured. In the airbag 15 of the embodiment, the second base fabrics 36L and 36R are symmetric, and the second base fabrics 36L and 36R have the shape on the outer edge 36d side in the first base fabric 32. Since the outer panel portions 34L and 34R are formed so as to have substantially the same shape as the portion excluding the base portion side edge portion 34b in the peripheral edge portion 34a, the base fabrics 36 and 32 are overlapped with each other at the time of sewing operation. If it arrange | positions in this way, the position of the edge parts to sew can be made to correspond, and a sewing operation | work will become easy.

  Thereafter, the airbag 11 is folded in a state where the bolt 11a is protruded from each mounting hole 21 and the retainer 11 is disposed therein, and further, the periphery of the folded airbag 15 is prevented so as not to collapse. Then, it is wrapped with a breakable wrapping sheet 14 (see FIG. 1). Then, the folded airbag 15 is placed on the bottom wall portion 6 a of the case 6 while the bolts 11 a are inserted through the case bottom wall portion 6 a. Next, the main body 8a of the inflator 8 is inserted into the case 6 from below the bottom wall 6a, and the bolts 11a protruding downward from the bottom wall 6a are inserted through the flange 8c of the inflator 8. . Thereafter, when the nut 12 is fastened to each bolt 11 a protruding from the flange portion 8 c of the inflator 8, the folded airbag 15 and the inflator 8 can be attached to the bottom wall portion 6 a of the case 6.

  Then, the peripheral wall portion 6b of the case 6 is locked to the connecting wall portion 10c of the airbag cover 10 in the instrument panel 1 mounted on the vehicle, and a predetermined bracket (not shown) of the case 6 is fixed to the body side portion. In this case, the passenger seat airbag device M can be mounted on the vehicle.

  If the inflation gas is discharged from each gas discharge port 8b of the inflator 8 when the airbag apparatus M is mounted on the vehicle and the vehicle collides with the front, the airbag 15 expands and the wrapping sheet 14 is broken. The door portions 10a and 10b of the airbag cover 10 are pushed and opened as shown by the two-dot chain line in FIG. The airbag 15 protrudes upward from the opening formed by opening the door portions 10a and 10b of the airbag cover 10 and closes the space between the instrument panel upper surface 2 and the windshield 4 above the instrument panel 1. Then, it expands and expands to the rear side of the vehicle, and the expansion is completed as shown by the two-dot chain line in FIG. 1 and FIGS.

  In the passenger seat airbag 15 according to the embodiment, the communication hole 23 serving as a communication portion that communicates the shoulder restraining portions 28L and 28R as the left and right protruding portions on the gas inlet 20 side in the left-right direction is provided when the inflation is completed. The opening area S1 in a cross section along the front-rear direction passing through the center of the gas inlet 20 in the airbag 15 is 1/5 or more of the projected area S2 of the entire airbag 15 as viewed from the side when the inflation is completed (implementation). In the case of the configuration, since it is set to be approximately 1/2), the expansion gas passes through the communication hole 23 and the one shoulder restraining portion 28 is restrained from being biased and inflated. The shoulder restraint portions 28L and 28R can be inflated substantially uniformly with a good balance. Incidentally, if the opening area S1 of the communication hole 23 is less than 1/5 of the projected area S2 of the entire airbag 15, only one shoulder restraining portion 28 may be biased and inflated when the airbag 15 is inflated. Arise.

  Therefore, in the passenger seat airbag 15 according to the embodiment, the shoulder restraining portions 28L and 28R as the two protruding portions constituting the occupant protection portion 27 can be inflated evenly, and the occupant approaching can be accurately detected. Can be protected.

  Further, in the airbag 15 of the embodiment, the occupant protection part 27 has the recess 29 between the left and right shoulder restraint parts 28L and 28R, so that the occupant MP interferes with the airbag 15 when the inflation is completed. When doing so, the left and right shoulder restraining portions 28L and 28R arranged to protrude rearward first interfere with the vicinity of the left and right shoulder portions MS of the occupant MP (see FIGS. 8 and 9). Thereafter, the head MH of the occupant MP whose both shoulders MS are restrained by the shoulder restraining portions 28L and 28R is restrained so as to enter the recess 29 between the shoulder restraining portions 28L and 28R and restrain the movement to the front side. Will be. Therefore, the head MH of the occupant MP can be softly received while suppressing the reaction force from the airbag 15. Further, in the airbag 15 of the embodiment, the communication hole 23 that forms the recess 29 has the opening area S1 that is 1/5 of the projected area S2 of the entire airbag 15 when viewed from the side when the inflation is completed. As described above (in the case of the embodiment, approximately ½), the cushioning property of the portion constituting the recess 29 in the occupant protection portion 27 is good. For this reason, even if the head MH of the occupant MP interferes with a portion constituting the recess 29 in the occupant protection part 27, the head MH of the occupant MP constitutes the recess 29 in the occupant protection part 27. Depending on the site, it can be accurately protected. Further, in the airbag 15 of the embodiment, when the inflation is completed, the recess 29 is disposed from the upper part to the rear part between the shoulder restraining parts 28L and 28R as shown in FIG. Even if the position of the head MH of the occupant MP that interferes with the inflated airbag 15 moves up and down due to the seating posture, the head MH of the occupant MP is restrained from the reaction force from the airbag 15 and softened. Can take it.

  Furthermore, in the airbag 15 of the embodiment, the concave portion 29 is configured by a stitched portion 31 in which the peripheral edges of the second base fabrics 36L and 36R constituting the inner wall portions 28c of the shoulder restraining portions 28L and 28R are sewn. Therefore, by changing the length dimension of the stitched portion 31 (the length dimension of the inner edge portion 36a in each of the second base fabrics 36L and 36R, in other words, it can be said to be the substantially inner diameter dimension of the inner edge portion 36a), The shape of the recess 29 between the left and right shoulder restraining portions 28L and 28R can be made deeper or shallower. At the same time, the opening area of the communication hole 23 for communicating the left and right shoulder restraining portions 28L and 28R can be changed. it can. That is, the shape of the recess 29 between the left and right shoulder restraint portions 28L and 28R can be easily changed without changing the outer shape of the airbag 15.

  Moreover, you may use the thing of the structure shown to FIGS. Similar to the airbag 15 described above, the airbag 40 has a substantially quadrangular pyramid shape with the front end as the top when the inflation is completed, and an upper side wall 40a that becomes the upper surface when the inflation is completed, and a lower surface side Lower side wall portion 40b, left and right side wall portions 40c and 40d on the left and right side surfaces, and rear side wall portion 40e on the rear surface side. And the airbag 40 of embodiment is the passenger | crew protection part 49 arrange | positioned at the rear side used as a passenger | crew side at the time of completion of inflation, and the front side of the passenger | crew protection part 49 at the time of completion of inflation similarly to the airbag 15 mentioned above. And a vehicle body side portion 41 disposed between the instrument panel 1 and the windshield 4, and the vehicle body side serving as the front end side of the lower side wall portion 40b of the airbag 40 when the inflation is completed The gas inlet 43 into which the expansion gas is allowed to flow is provided at a portion near the center of the portion 41 in the left-right direction. Similar to the airbag 15 described above, a plurality of mounting holes 44 are formed on the periphery of the gas inlet 43. Further, as shown in FIG. 12, the airbag 40 of the embodiment is provided with a tether 57 that regulates the shape when the inflation is completed.

  The occupant protection part 49 is recessed from the upper part to the rear part between the shoulder restraint part 50 (50L / 50R) that is juxtaposed on both left and right sides and protrudes rearward so as to extend in the vertical direction and the left and right shoulder restraint parts 50L / 50R. And a recess 52. In the case of the embodiment, when the airbag 40 is completely inflated, the shoulder restraining portions 50L and 50R are connected so that the rear surface side of the lower end side is substantially planar, and are substantially V-shaped when viewed from the vehicle rear side. Are formed (see FIG. 14). In the case of the embodiment, the raised state of the left and right shoulder restraint portions 50L and 50R and the depressed state of the recessed portion 52 are the front side in the region from the rear side wall portion 40e of the airbag 40 to the upper side wall portion 40a. Is extended continuously to a portion of the vehicle body side portion 41 in the vicinity of the gas inlet 43.

  As shown in FIG. 13, the airbag 40 of the embodiment includes two first base fabrics 59L and 59R, one second base fabric 64, and two strip-shaped tether base fabrics 66. It is configured. Each of the first base fabrics 59L and 59R includes an upper panel portion 60L and 60R and a rear panel portion 61L and 61R. Each of the upper side panel portions 60L and 60R mainly constitutes an upper side wall portion 40a of the airbag 40 that has been inflated, and a portion that is an upper side of the left side and right side wall portions 40c and 40d. Each of the rear side panel portions 61L and 61R mainly constitutes the rear side wall portion 40e of the airbag 40 that has been inflated. Each of the first base fabrics 59L and 59R has a long shape in which the upper side panel portion 60 and the rear side panel portion 61 are connected at a position near the upper end when the expansion is completed, and each has a left-right symmetric shape. ing. The second base fabric 64 constitutes the lower side wall portion 40b of the airbag that has been inflated and the lower side portions of the left and right side wall portions 40c and 40d, and the gas inlet 43 is located near the front end. It is made into the substantially hexagon shape provided with. The first and second base fabrics 59L, 59R, and 64 and the tether base fabric 66 are formed of a flexible woven fabric made of polyester, polyamide yarn, or the like, similar to the airbag 15 described above. It is configured as a non-coated cloth not coated with a coating material such as silicon.

  A communication portion (communication hole) 46 that communicates the shoulder restraint portions 50L and 50R in the left-right direction is disposed on the inner peripheral side of the airbag 40 below the recess 52 in the occupant protection portion 49. This communication hole 46 is configured by sewing the corresponding portions on the left and right sides of the upper side panel portions 60L and 60R and the rear side panel portions 61L and 61R of the first base fabrics 59L and 59R at the periphery of the opening surface. It is comprised from the stitching | suture site | part made and the 2nd base fabric 64. FIG. In the case of the embodiment, the communication hole 46 is formed by sewing the upper side peripheral edge 46a on the front side of the opening surface to the lower side inner peripheral edge 60b of the upper side panel parts 60L and 60R in the first base cloth 59L and 59R. The upper peripheral edge 46b on the rear side of the opening surface is configured by sewing the lower inner peripheral edge 61b of the rear side panel parts 61L and 61R of the first base fabrics 59L and 59R to each other. In the embodiment, it is disposed from the lower side of the occupant protection part 49 to the lower side of the vehicle body side part 41 in the airbag 40 when the inflation is completed. The communication hole 46 is disposed so that the opening surface is substantially along the front-rear direction at the approximate center in the left-right direction when the airbag 40 is completely inflated. As shown in FIG. 12, the opening area S3 in the cross-section along the front-rear direction passing through the approximate center of the gas inlet 43 in the airbag 40 at the completion of the inflation is the entire airbag 40 as viewed from the side at the completion of the inflation. Is set to 1/5 or more of the projected area S4. In the case of the embodiment, the opening area S3 of the communication hole 46 is set to approximately ½ of the projected area S4 of the airbag 40 when the inflation is completed. Of course, also in the airbag 40 of the embodiment, the opening area S3 of the communication hole 46 is set to be less than 4/5 of the projected area S4 of the airbag 40 when the inflation is completed from the viewpoint of softly protecting the head of the occupant. It is desirable to do.

  In addition, vent holes 47 and 47 are formed in the left and right side wall portions 40c and 40d of the airbag 40, respectively. In the embodiment, the tether 57 disposed in the airbag 40 at the time of completion of the inflation is substantially band-shaped, and one end side is near the center of the front, rear, left, and right of the lower wall portion 40b of the airbag 40. The other end side is coupled to the vicinity of the upper end side of the inner side of the airbag 40 of the recess 52, and is disposed in the airbag 40 when the inflation is completed so as to be substantially along the front-rear direction. Has been.

  Next, manufacture of the airbag 40 of embodiment is demonstrated. First, the first base fabrics 59L and 59R are overlapped with each other, and the lower inner peripheral edge portions 61b of the rear side panel portions 61L and 61R are sewn together using a suture thread. At the same time, one end of one tether base fabric 66 is also sewn to a position near the upper end of the lower-side inner peripheral edge 61b. Note that one end of the other tether base fabric 66 is sewn to the vicinity of the center of the second base fabric 64 using a suture thread. Next, the lower side inner peripheral edge portions 60b of the upper side panel portions 60L and 60R in the first base fabrics 59L and 59R are sewn together using sutures. Thereafter, the overlapped first base fabrics 59L and 59R are opened so that the outer peripheral edges are opposite to each other, and in the vicinity of the connecting portion between the upper side panel portion 60 and the rear side panel portion 61, the upper side panel portion 60 and the rear portion The side panel 61 is folded back so as to overlap. Then, the upper inner peripheral edge 61a of the rear panel portions 61L and 61R and the upper inner peripheral edge 60a of the upper panel portions 60L and 60R are sewn using sutures. Further, upper side outer peripheral edge portions 60c formed on the left and right edge sides of the upper side panel portions 60L and 60R, and upper side outer peripheral edge portions 61c formed on the left and right edge sides of the adjacent rear side panel portions 61L and 61R, Are sewn using sutures.

  Thereafter, the first base fabrics 59L and 59R are opened so that the remaining peripheral edges 60d, 60e, and 61d that are not sewn are separated from each other, and the second base fabric 64 is overlaid on the first base fabrics 59L and 59R. Note that the shapes of the first base fabrics 59L and 59R with the remaining peripheral edges 60d, 60e, and 61d open coincide with the developed shape of the second base fabric 64. Next, the lower outer peripheral edge portions 61d and 61d of the rear side panel portions 61L and 61R in the first base fabrics 59L and 59R are sewn to the rear edge portion 64a of the second base fabric 64 using a suture, The lower outer peripheral edge portions 60d and 60d of the upper panel portions 60 and 60 in the first base fabrics 59L and 59R are respectively used on the left and right edge portions 64b and 64c of the second base fabric 64 by using sutures. Sewing. Thereafter, the front edge portions 60e and 60e in the upper side panel portions 60L and 60R of the first base fabric 59L and 59R and the front edge portion 64d of the second base fabric 64 are sewn using a suture, The first base fabric 59L / 59R and the second base fabric 64 are reversed using the gas inlet 43 so that the seam allowance at the edge is not exposed to the outside. The airbag 40 can be manufactured by pulling out the other end side of the tether base fabric 66, 66 from the gas inlet 43 and sewing the edges together.

  Also in the airbag 40 having the above-described configuration, the communication hole 46 that allows the shoulder restraint portions 50L and 50R to communicate in the left-right direction at the time of deployment and inflation when mounted on a vehicle, completes the opening area S3. The shoulder restraint portions 50L and 50R on both the left and right sides are substantially evenly balanced because it is set to be larger than 1/5 of the projected area S4 of the airbag 40 (approximately 1/2 in the embodiment). It can be inflated, and an occupant approaching can be protected properly.

  Further, in the airbag 40 having the above-described configuration, the occupant protection part 49 has the recess 52 disposed between the left and right shoulder restraint parts 50L and 50R. When the interference occurs, the left and right shoulder restraint portions 50L and 50R disposed so as to protrude rearward first interfere with the vicinity of the left and right shoulder portions MS of the occupant MP (see FIG. 15). Thereafter, the head MH of the occupant MP whose both shoulders MS are restrained by the shoulder restraining portions 50L and 50R is restrained so as to prevent the forward movement while entering the recess 52 between the shoulder restraining portions 50L and 50R. Will be. Therefore, the head MH of the occupant MP can be softly received while suppressing the reaction force from the airbag 40. Also in the airbag 40 of the embodiment, the communication hole 46 constituting the recess 52 (located on the lower side of the recess 52) has an opening area S3 that is equal to 1 / of the projected area S4 of the airbag 40 when the inflation is completed. Since it is set to 5 or more (in the case of the embodiment, approximately ½), the cushioning property of the portion disposed on the lower side of the recess 52 in the occupant protection portion 49 is also good. Therefore, even if the head MH of the occupant MP moves and interferes with a portion disposed on the lower side of the recess 52 in the occupant protection part 49, the head MH of the occupant MP It can protect exactly by the site | part of the lower part side of the recessed part 52. FIG. Further, also in the airbag 40 of the embodiment, when the inflation is completed, the recess 52 between the shoulder restraining portions 50L and 50R is continuously disposed substantially along the vertical direction from the upper end side of the occupant protection portion 49. (See FIG. 14). Therefore, even if the position of the head MH of the occupant MP that interferes with the inflated airbag 40 moves up and down due to the physique and seating posture of the occupant MP, the head MH of the occupant MP enters the recess 52. Thus, the reaction force from the airbag 40 can be restrained and received softly.

  Furthermore, also in the airbag 40 of the embodiment, the communication hole 46 in the occupant protection part 49 has a stitched portion 54. which stitches the periphery of the opening surface (upper periphery 46a, 46b) and the periphery of the first base fabric 59, 59. 55. Therefore, the length dimensions of these stitched portions 54 and 55 (the upper side portions 60a and 61a and the lower side portions 60b and 61b of the inner peripheral edge of the upper and rear side panel portions 60 and 61 in the first base fabric 59) By changing the ratio of the length dimensions and the length dimensions themselves, in other words, the degree of depression of the lower side portions 60b and 61b), the opening area of the communication hole 46 for communicating the left and right shoulder restraint portions 50L and 50R is changed. It can be easily changed. As a result, the shape of the recess 52 between the left and right shoulder restraints 50L and 50R can be set deeper or shallower, and the left and right shoulder restraints 50L and 50L can be set without changing the outer shape of the airbag 40. The shape of the recess 52 between 50R can be easily changed.

  Furthermore, the airbag 69 may be configured as shown in FIGS. The airbag 69, like the airbags 15 and 40 described above, has a substantially quadrangular pyramid shape with the front end as the top when the inflation is completed, and an upper side wall 69a that becomes the upper surface when the inflation is completed, A lower side wall portion 69b on the lower surface side, left and right side wall portions 69c and 69d on the left and right side surfaces, and a rear side wall portion 69e on the rear surface side are configured. The airbag 69 has an occupant protection part 77 disposed on the rear side that becomes the occupant side when the inflation is completed, and a front side of the occupant protection part 77 when the inflation is completed. And a vehicle body side portion 70 disposed between the instrument panel 1 and the windshield 4, and the vehicle body side portion serving as the front end side of the lower wall portion 69 b of the airbag 69 when the inflation is completed. A gas inlet 72 for allowing the expansion gas to flow in is provided at a position near the center in the left-right direction of 70. A plurality of mounting holes 73 are formed in the periphery of the gas inlet 72, similar to the airbags 15 and 40 described above. Further, as shown in FIG. 18, the airbag 69 of the embodiment is also provided with a tether 84 that regulates the shape when the inflation is completed, as shown in FIG. 18.

  The occupant protection portion 77 includes two shoulder restraint portions 78L and 78R and a concave portion 80 between the shoulder restraint portions 78L and 78R, similarly to the occupant protection portion 49 in the airbag 40 described above. In the case of the embodiment, the shoulder restraining portions 78L and 78R are connected so that the rear surface side of the lower end side is substantially flat like the above-described airbag 40, and are substantially V-shaped when viewed from the vehicle rear side. Is formed. In the occupant protection part 77 of the embodiment, the raised state of the left and right shoulder restraint parts 78L and 78R and the depressed state of the recessed part 80 are within the region from the rear side wall part 69e of the airbag 69 to the upper side wall part 69a. It is continuously extended over the site | part used as the gas inlet 72 vicinity of the vehicle body side part 70 so that it may become the front side which becomes.

  As shown in FIG. 19, the airbag 69 of the embodiment includes one first base cloth 86, two second base cloths 89 </ b> L and 89 </ b> R, and two strip-shaped tether base cloths 90 and 90. , Is composed of. The first base fabric 86 is configured to include an upper panel portion 87 and a lower panel portion 88. The upper side panel portion 87 mainly constitutes the upper side wall portion 69a of the airbag 69 that has been inflated and the upper side portions of the left and right side wall portions 69c and 69d. It is formed in a substantially fan shape with a narrow side. Further, the upper panel portion 87 has a shape in which an upper edge portion 87c which is the upper end side and the rear edge side at the time of completion of expansion is curved so that the left and right end sides protrude rearward. The lower side panel portion 88 mainly constitutes a lower wall portion 69b of the airbag 69 that has been inflated and portions located on the lower side of the left and right side wall portions 69c and 69d. It is formed in a substantially fan shape with a narrow front end side. And the 1st base fabric 86 is made into the shape which connected the upper side panel part 87 and the passenger | crew side panel part 88 near the front end at the time of completion | finish of expansion | swelling. The second base fabrics 89L and 89R constitute the rear side wall 69e of the airbag 69 that has been inflated. The second base fabric 89L and 89R project the center in the left-right direction upward on the upper edge 89b side, and the inner edge 89a side. It is made into the curved shape so that it may be dented, and each is formed in the left-right symmetric form. The first and second base fabrics 86, 89L, and 89R and the tether base fabric 90 are formed of flexible woven fabric made of polyester, polyamide yarn, or the like, like the airbags 15 and 40 described above. Thus, it is configured as a non-coated cloth in which a coating material such as silicon is not applied.

  A communication portion (communication hole) 74 that communicates the shoulder restraint portions 78L and 78R in the left-right direction is disposed on the inner peripheral side of the airbag 69 below the recess 80 in the occupant protection portion 77. The communication hole 74 is formed by stitching the upper peripheral edge of the opening surface by sewing the upper panel portion 87 portion of the first base fabric 86 and the inner peripheral edge portions 89a of the second base fabrics 89L and 89R. 82, and the lower peripheral edge of the opening surface is composed of the lower panel portion 88. In the case of the embodiment, from the lower front end of the occupant protection portion 77 in the airbag 69 when the inflation is completed. It is disposed over the vehicle body side part 70. The communication hole 74 is disposed so that the opening surface is substantially along the front-rear direction at the approximate center in the left-right direction when the airbag 69 is completely inflated, and is similar to the airbags 15 and 40 described above. As shown in FIG. 18, the airbag 69 has an opening area S <b> 5 in a cross-section along the front-rear direction passing through the approximate center of the gas inlet 72 in the airbag 69 when the inflation is completed, as viewed from the side when the inflation is completed. It is set to 1/5 or more of the projection area S6 of the entire 69. In the case of the embodiment, the opening area S5 of the communication hole 74 is set to approximately ½ of the projected area S6 of the airbag 69 when the inflation is completed. Of course, also in the airbag 69 of the embodiment, the opening area S5 of the communication hole 74 is set to be less than 4/5 of the projected area S6 of the airbag 69 when the inflation is completed from the viewpoint of softly protecting the head of the occupant. It is desirable to do.

  In addition, vent holes 75 and 75 are formed in the left and right side wall portions 69c and 69d of the airbag 69, respectively. Further, in the embodiment, the tether 84 disposed in the airbag 69 when the inflation is completed is substantially band-shaped, and one end side is a portion near the upper end of the rear side wall portion 69e near the approximate center in the left-right direction. The other end side is coupled to a position near the center of the lower side wall portion 40b in the front, rear, left and right directions, and is disposed in the airbag 69 at the time of completion of inflation so as to be substantially along the front and rear direction. ing.

  Next, manufacture of the airbag 69 of embodiment is demonstrated. First, the second base fabrics 89L and 89R are overlapped with each other, and the inner peripheral edge portions 89a and 89a are sewn using a suture thread. At the same time, one end of one tether base fabric 90 is also sewn at a position near the upper end of the inner peripheral edge 89a. Note that one end of the other tether base fabric 90 is sewn to the vicinity of the center of the lower panel portion 88 of the first base fabric 86 using a suture. Next, the first base fabric 86 is folded back in the vicinity of the front end when the expansion is completed, and the left and right edge portions 87a and 88a of the adjacent upper and lower side panel portions 87 and 88, and the right edge portions 87b and 88b, Each is sewn using a suture. Thereafter, the first base cloth 86 is opened so that the remaining peripheral edges 87c and 88c that are not stitched are separated from each other, and the second base cloth 89L and 89R are separated from the outer peripheral edges on the first base cloth 86. Overlapping in the open state. Note that the shape of the first base cloth 86 with the remaining peripheral edges 87c and 88c opened matches the shape of the second base cloth 89L and 89R opened and unfolded. Next, the upper edge portion 87c of the upper side panel portion 87 of the first base fabric 86 is sewn to the upper edge portions 89b and 89b of the second base fabric 89L and 89R using a suture thread. Thereafter, the rear edge portion 88c of the lower panel portion 88 of the first base fabric 86 is sewn to the lower edge portions 89c and 89c of the second base fabric 89L and 89R using a suture thread, and the first base fabric 86 86 and the second base fabrics 89 </ b> L and 89 </ b> R are reversed using the gas inflow port 72 so that the seam allowance of the edge portion is not exposed to the outside. The airbag 69 can be manufactured by pulling out the other ends of the tether base fabrics 90 and 90 from the gas inlet 72 and sewing the edges together.

  In the airbag 69 configured as described above, the communication hole 74 that allows the shoulder restraint portions 78L and 78R to communicate in the left-right direction at the time of deployment and inflation when mounted on the vehicle has an opening area S5. Since the projection area S6 of the airbag 69 at the time of completion of inflation is set to be larger than 1/5 (approximately 1/2 in the case of the embodiment), the shoulder restraining portions 78L and 78R on both the left and right sides are approximately equal. It can be inflated in a well-balanced manner, and can accurately protect the occupant approaching.

  In the airbag 69 configured as described above, since the occupant protection part 77 has the recess 80 between the left and right shoulder restraint parts 78L and 78R, the occupant MP is placed in the airbag 69 when the inflation is completed. When the interference occurs, the left and right shoulder restraint portions 78L and 78R disposed so as to protrude rearward first interfere with the vicinity of the left and right shoulder portions MS of the occupant MP (see FIG. 21). Thereafter, the head MH of the occupant MP, whose both shoulders MS are restrained by the shoulder restraining portions 78L, 78R, is restrained so as to suppress the forward movement while entering the recess 80 between the shoulder restraining portions 78L, 78R. Will be. Therefore, the head MH of the occupant MP can be softly received while suppressing the reaction force from the airbag 69. Also in the airbag 69 of the embodiment, the communication hole 74 constituting the recess 80 (located on the lower side of the recess 80) reduces the opening area S5 to 1 / of the projected area S6 of the airbag 69 when the inflation is completed. Since it is set to 5 or more (approximately 1/2 in the case of the embodiment), the cushioning property of the portion disposed on the lower side of the recess 80 in the occupant protection portion 77 is also good. Therefore, even if the head MH of the occupant MP moves and interferes with a portion disposed on the lower side of the recess 80 in the occupant protection part 77, the head MH of the occupant MP It can protect exactly by the site | part of the lower part side of the recessed part 80. FIG. Furthermore, also in the airbag 69 of the embodiment, when the inflation is completed, the recess 80 between the shoulder restraint portions 78L and 78R is continuously arranged from the upper end side of the occupant protection portion 77 substantially along the vertical direction. (Refer to FIG. 22). Therefore, even if the position of the head MH of the occupant MP that interferes with the inflated airbag 69 moves in the vertical direction due to the physique and seating posture of the occupant MP, the head MH of the occupant MP enters the recess 80. Thus, the reaction force from the airbag 69 can be suppressed, and it can be received softly.

  Further, also in the airbag 69 of the embodiment, the communication hole 74 in the occupant protection portion 77 is configured by the stitched portion 82 where the rear edge 74a side of the upper peripheral edge of the opening surface is sewn on the peripheral edge of the second base fabric 89L / 89R. Has been. Therefore, by changing the length dimension of the stitched portion 82 (the length dimension of the inner peripheral edge portion 89a in each of the second base fabrics 89L and 89R), the communication hole 74 for communicating the left and right shoulder restraint portions 78L and 78R. The opening area can be easily changed. As a result, the shape of the recess 80 between the left and right shoulder restraints 78L and 78R can be set deep or shallow, and the left and right shoulder restraints 78L and 78L can be set without changing the outer shape of the airbag 69. The shape of the recess 80 between 78R can be easily changed. Of course, if such a point is not taken into consideration, the second base fabrics 89L and 89R may be integrated into a single base fabric.

It is sectional drawing of the vehicle front-back direction of the airbag apparatus for passenger seats using the airbag for passenger seats which is one Embodiment of this invention. It is the perspective view seen from the front side of the state where the airbag of the embodiment was inflated alone. It is the perspective view seen from the back side of the state where the airbag of an embodiment was inflated alone. It is sectional drawing along the front-back direction of the state which expanded the airbag of embodiment alone. It is sectional drawing of the state which expanded the airbag of embodiment alone, and respond | corresponds to the VV site | part of FIG. It is a top view which shows the member which comprises the airbag of embodiment. It is a figure explaining the use condition of the airbag of an embodiment, and it is the figure seen from the vehicles back side explaining the state where inflation was completed. It is a figure explaining the use condition of the air bag of an embodiment, and is the schematic seen from the upper part of the vehicles explaining the state where inflation was completed. It is a figure explaining the use condition of the airbag of an embodiment, and is the schematic seen from the side of vehicles explaining the state where inflation was completed. It is the perspective view seen from the front side of the state which inflated the airbag which is other embodiment of this invention alone. It is the perspective view seen from the back side of the state which expanded the airbag of FIG. 10 alone. It is sectional drawing along the front-back direction of the state which expanded the airbag of FIG. 10 alone. It is a top view which shows the member which comprises the airbag of FIG. It is a figure explaining the use condition of the airbag of Drawing 10, and it is the figure seen from the vehicles back side explaining the state where inflation was completed. It is a figure explaining the use condition of the airbag of Drawing 10, and is the schematic seen from the side of vehicles explaining the state where inflation was completed. It is the perspective view seen from the front side of the state which inflated the airbag which is further another embodiment of this invention alone. It is the perspective view seen from the back side of the state which expanded the airbag of FIG. 16 alone. It is sectional drawing along the front-back direction of the state which expanded the airbag of FIG. 16 alone. It is a top view which shows the member which comprises the airbag of FIG. It is a figure explaining the use condition of the airbag of FIG. 16, and is the figure seen from the vehicle rear side explaining the state which the inflation was completed. It is the figure explaining the use condition of the airbag of Drawing 16, and is the schematic seen from the side of vehicles explaining the state where inflation was completed.

Explanation of symbols

1 ... Instrument panel (instrument panel),
4 ... Windshield,
15.40.69 ... Airbag,
16, 41, 70 ... the side of the vehicle body,
20, 43, 72 ... Gas inlet,
23, 46, 74 ... communication hole (communication part),
27, 49, 77 ... Passenger Protection Department,
28, 50, 78 ... shoulder restraint,
29.52.80 ... concave,
S1, S3, S5 ... opening area (of the communication hole),
S2, S4, S6 ... projected area (of the airbag),
M ... Airbag device for passenger seat.

Claims (1)

Folded to the upper side of the instrument panel in front of the passenger seat of the vehicle and protrudes upward when the inflation gas flows in, and between the upper surface of the instrument panel and the windshield above the instrument panel It is configured to expand and expand to the rear side of the vehicle so as to close it,
Provided with a gas inlet for inflating gas into the position near the center in the left-right direction on the lower surface of the front end when the inflation is completed, and interferes with a passenger seated in the passenger seat at a position on the rear side when the inflation is completed In an airbag for a passenger seat configured to include an occupant protection portion that is made possible,
When the airbag is inflated, the shape of the airbag is a substantially quadrangular pyramid shape with the front end as the top, and the left and right side walls and the right and left side walls that are disposed along the front-rear direction on both the left and right sides; And a rear side wall disposed substantially along the left-right direction so as to connect the upper side wall part and the lower side wall part on the occupant side. And a configuration comprising:
When the occupant protection unit completes the inflation of the airbag,
Left and right shoulder restraint portions that are arranged side by side in the left-right direction and are arranged so as to protrude rearward so that they can interfere with the left and right shoulder portions of the occupant,
A recess disposed from the upper part to the rear part between the shoulder restraint parts;
It is configured with
The communication portion that communicates the left and right shoulder restraint portions on the gas inlet side in the left-right direction has an opening area in a cross-section along the front-rear direction passing through the center of the gas inlet in the airbag when inflation is completed, It is configured to be set to 1/5 or more of the projected area of the entire airbag viewed from the side when the inflation is completed,
The airbag, while being a sewn bag is formed by sewing the peripheral edges of the base fabric of a predetermined shape, a first base fabric, mutually each substantially C-shape so that the left right symmetrical And two second base fabrics that are curved strips,
The first base fabric constitutes the left side wall and the right side wall,
Each of the second base fabrics constitutes left and right halves of the upper side wall, the lower side wall, and the rear side wall, respectively.
The projecting top portion of the shoulder restraint portion is configured from the vicinity of the stitched site where the outer peripheral edge of the first base fabric and the outer peripheral side of the second base fabric are sewn together,
The front passenger seat airbag is characterized in that the front end of the recess is formed from the vicinity of a stitched portion where the inner peripheral edges of the second base fabric are sewn together.

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