JP2012206588A - Airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag device having an airbag with excellent protection performance for properly protecting an object to be restrained.SOLUTION: The airbag device S1 has a bag-shaped airbag body 15 which is stored in a storage section, and inflates by introducing inflation gas when in operation to receive an object to be restrained. The airbag body 15 is made of synthetic resin and having sheet-like peripheral walls 16a, 16b. On an outer wall part 16b, which does not face the object, in the peripheral wall 16 constituting the airbag body 15, the airbag body 15 is inflated and stretched. A part to be opened or an opening part is formed, which is opened or increased in diameter when the object is received and the airbag body 15 has higher inner pressure, to allow the inflation gas in the airbag body 15 to smoothly flow out of the airbag body 15.

Description

  The present invention relates to a resin airbag device that inflates a bag-shaped airbag main body whose peripheral wall is made of a sheet-like synthetic resin by inflow of inflation gas generated by the gas generator.

2. Description of the Related Art As an airbag of an airbag device, one in which a bag-like peripheral wall is made of a synthetic resin film material such as polypropylene, polyamide, or polyethylene terephthalate is known (see, for example, Patent Document 1).
In addition, some airbags are provided with vent holes in order to obtain an appropriate restraining force when restraining an occupant riding the vehicle in a state where the inflation gas has flowed in and inflated, For this vent hole, a film made of rubber or a polymer material is attached to the vent hole of the airbag at the flange part by vulcanization adhesion or molding, and attached to the membrane when the pressure inside the airbag increases. An airbag having a configuration in which a vent hole is opened by breaking a provided groove is known (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 9-24787 Japanese Utility Model Publication No. 47-17340

  However, in general, the film material made of synthetic resin does not discharge the inflation gas flowing into the airbag to the outside of the airbag through the film. Even at the time of restraint, the pressure inside the airbag remains high, and an appropriate restraint force may not be obtained.

  Therefore, a rubber or polymer-based film is attached to the vent hole provided in the airbag, and the flange hole is attached to the vent hole of the airbag by vulcanization adhesion or molding, so that the vent hole is closed. When the pressure in the interior increases, the groove provided in the membrane breaks and the vent hole opens, so that when the object to be restrained is restrained, the inflation gas in the airbag In this case, the membrane flange portion provided with the groove is vulcanized into the vent hole opening of the airbag formed in advance. It has to go through a complicated process of attaching them together by bonding or molding. Furthermore, since the film is provided with a groove that is broken when the pressure in the airbag is increased, the film may be scattered when the groove is broken. In general, a membrane formed with a groove for breaking different from the fabric is integrally attached to the airbag formed of the fabric, and the vent hole portion is a general portion of the airbag. It is also conceivable that the smooth deployment and expansion of the airbag is hindered due to the difference in characteristics such as weight and hardness, particularly when the airbag is folded and stored at normal times.

  The airbag apparatus according to the present invention solves the above-described problems, and is an airbag apparatus in which the airbag body is made of synthetic resin. When the internal pressure of the airbag body is increased by the inflow of inflation gas. In addition, the inflation gas can be smoothly flowed out of the airbag body, which is easy to manufacture, prevents scattering when the inflation gas flows out, and improves workability when folding the airbag. It is an object of the present invention to provide an airbag device that can be used.

  An airbag apparatus according to claim 1 of the present invention is a bag-like airbag that is accommodated in an accommodating part and inflated by inflating an inflating gas into the interior during operation to receive an object to be restrained. A resin airbag device having a main body and inflating a bag-shaped airbag main body having a peripheral wall made of a sheet-like synthetic resin by inflow of an inflating gas generated by the gas generator, A structure in which the bag body is made of a synthetic resin having a sheet-like peripheral wall, and the peripheral wall is plastically deformed so as to be stretched when the object to be constrained is restrained after the inflation of the airbag body is completed. And the peripheral wall is closed at a normal time when the airbag body is not inflated, and a general part constituting a wall portion of the airbag body inflated by the inflation gas flowing in, An opening that is opened when the inflation gas flows in and expands, and the inflation gas is discharged to the outside of the bag-like airbag body. The gist is that the portion and the planned opening portion are formed of the same synthetic resin material continuously and integrally.

  In the first aspect of the present invention, the general portion and the planned opening portion are made of the same synthetic resin material, and are formed continuously and integrally. When it is raised, it opens and allows the inflation gas to flow to the outside of the airbag body, so that an object to be restrained such as a vehicle occupant can be restrained appropriately. Further, since the general portion and the planned opening portion are formed continuously and integrally, for example, the general portion and the planned opening portion can be manufactured relatively easily by known blow molding or the like, and the planned opening portion is scattered during expansion. It is also possible to reduce the risk of folds and improve the workability of folding when the airbag is stored.

  An airbag apparatus according to a second aspect of the present invention is the airbag apparatus according to the first aspect, wherein the planned opening portion is a thin-walled portion having a thickness smaller than that of the general portion of the airbag body. And

  In the invention of claim 2, in addition to the invention of claim 1, since the thickness of the planned opening portion is made smaller than that of the general portion, the inflation pressure flows into the airbag main body and the internal pressure increases in the planned opening portion. In this case, the planned opening portion can be easily opened, and the inflation gas can flow out more smoothly to the outside of the airbag body. Further, the opening planned portion having a small thickness is, for example, a mold for forming an airbag body by blow molding, and can be easily formed by providing an uneven portion at a portion corresponding to the opening planned portion. it can.

  The airbag apparatus according to a third aspect of the present invention is the airbag apparatus according to the first or second aspect, wherein the scheduled opening portion is formed outwardly of the airbag body from a root portion connected to the general portion. It is a protrusion part which protrudes toward the side, The thickness of the front-end | tip part of the said protrusion part was made into the thin part made smaller than the said general part of the air bag main body, It is characterized by the above-mentioned.

  In the invention of claim 3, in addition to the invention of claim 1 or claim 2, the planned opening portion is a protruding portion that protrudes from the root portion connected to the general portion toward the outer side of the airbag body, Since the thickness of the tip of the protrusion is smaller than the general part of the airbag body, it can be easily cleaved when the inflation gas flows into the airbag body and the internal pressure increases. . Moreover, this protrusion part can be easily formed by making the site | part corresponding to a protrusion part into a recessed part with the shaping | molding die at the time of forming an airbag main body by blow molding, for example.

  The airbag device according to a fourth aspect of the present invention is the airbag device according to the second or third aspect, wherein the protruding portion is located on the outer side of the airbag body from a root portion connected to the general portion. It is formed in the substantially V shape which tapers toward the surface, and the thickness of the front-end | tip part is made smaller than the thickness of the said base part, It is characterized by the above-mentioned.

  In the invention of claim 4, in addition to the invention of claim 2 or claim 3, the substantially V-shaped shape in which the projecting portion is tapered from the root portion connected to the general portion toward the outer side of the airbag body. The tip has a thickness smaller than that of the root, so stress tends to concentrate at the tip of the protrusion, and the inflation expands when the inflation gas flows into the airbag body and the internal pressure increases. The working gas can be more easily discharged to the outside of the airbag body. Also, this substantially V-shape can be easily formed by the same method as in the third aspect.

  According to a fifth aspect of the present invention, in the airbag device according to the third or fourth aspect, the protrusion has a thickness that gradually decreases from the root portion toward the tip portion. It is characterized by.

  In the invention of claim 5, in addition to the invention of claim 3 or claim 4, since the projecting portion is configured to gradually reduce the thickness from the root portion toward the tip portion, stress concentration at the tip portion is reduced. It is possible to make it easier to get up, and furthermore, when the inflation gas flows into the airbag body and the internal pressure is increased, the inflation gas can be more easily discharged to the outside of the airbag body.

According to a sixth aspect of the present invention, an airbag device is accommodated in a storage part, and in operation, the airbag device is inflated by inflating an inflating gas to receive a restrained object. A resin airbag device having a main body and inflating a bag-shaped airbag main body having a peripheral wall made of a sheet-like synthetic resin by inflow of an inflating gas generated by the gas generator, A structure in which the bag body is made of a synthetic resin having a sheet-like peripheral wall, and the peripheral wall is plastically deformed so as to be stretched when the object to be constrained is restrained after the inflation of the airbag body is completed. The peripheral wall includes a general part constituting a wall part of the airbag body inflated by the inflow of the inflation gas, and the inflation wall from the inner side to the outer side of the inflated airbag body. Gas An opening capable out, consists,
The opening adopts that the opening area can be expanded from the normal time when the airbag body is not inflated by extending the general part with the inflow of the inflation gas.

  According to a sixth aspect of the present invention, an opening is provided in the peripheral wall of the airbag body so that the inflation gas can flow out from the inner side to the outer side of the inflated airbag body. By extending the general portion of the airbag peripheral wall with the inflow of gas, the opening area is expanded from the normal time when the airbag body is not inflated. Since the inflation gas can flow out smoothly, an object to be restrained such as a vehicle occupant can be restrained appropriately. In addition, the opening is provided with a predetermined protrusion at a corresponding part of a molding die when the airbag body is formed by, for example, blow molding, or a hole is formed in the opening after blow molding. Even if the airbag body expands and the opening area of the opening is enlarged, the risk of scattering can be reduced, and the folding workability when storing the airbag is also reduced Can be improved.

  The airbag device according to claim 7 of the present invention is the airbag device according to claim 6, wherein the general portion is formed with a protruding portion protruding outward of the airbag body, The opening is formed at a tip portion of the protrusion.

  In the invention of claim 7, in addition to the invention of claim 6, since the opening is formed at the tip portion of the protruding portion provided in the general part, when the internal pressure of the airbag body is increased by expansion, Stress can easily concentrate on the opening, the opening area of the opening can be smoothly expanded, and the inflation gas can easily flow out of the airbag body. The opening can be formed by the same method as in the sixth aspect.

  The airbag apparatus according to an eighth aspect of the present invention is the airbag apparatus according to the seventh aspect, wherein the projecting portion tapers from a root portion connected to the general portion toward an outer side of the airbag body. It is formed in the substantially V shape used as follows, The thickness of the front-end | tip part is made smaller than the thickness of the said base part, It is characterized by the above-mentioned.

  In the invention of claim 8, in addition to the invention of claim 7, the projecting portion is formed in a substantially V-shape that tapers toward the outer side of the base portion airbag body connected from the general portion, Since the thickness of the part is smaller than the thickness of the root part, when the internal pressure of the airbag body increases due to inflation, this part is easily stretched, and the inflation gas can be easily moved to the outside of the airbag body. Can be drained. The opening can be formed by the same method as in the sixth aspect.

  An airbag apparatus according to a ninth aspect of the present invention is the airbag apparatus according to any one of the first to eighth aspects, wherein the airbag body is normally folded and stored in a storage portion in a vehicle seat. When the inflation gas flows in, the occupant seated on the seat expands and expands in the lateral direction of the vehicle, and the planned opening or the opening faces the occupant in the width direction of the vehicle. It is formed in the side which is not.

  According to a ninth aspect of the present invention, the airbag device according to any one of the first to eighth aspects of the present invention is normally stored by folding the airbag main body and folding it into a storage portion in the seat. At the time of inflow, a mode in which the occupant seated on the seat expands and expands to the side in the vehicle width direction is formed, and the planned opening portion or the opening portion is formed on the side not facing the occupant in the vehicle width direction. In this way, the occupant is directly supplied with inflation gas.

  The present invention smoothly restrains an object to be restrained, such as a vehicle occupant, from the airbag main body whose internal pressure is increased by the inflow of the inflation gas, by smoothly flowing the inflation gas to the outside of the airbag. Provided is an airbag device that can be used.

It is a side view which shows the usage condition of the airbag apparatus which is 1st Embodiment of this invention. It is AA sectional drawing of FIG. 1 in the accommodation state of the airbag apparatus of FIG. 1 is a side view of an airbag device according to a first embodiment. It is a front view which shows the usage condition of the airbag apparatus which is 1st Embodiment. It is BB sectional drawing of FIG. 3 of the opening plan part in 1st Embodiment. (The state where the planned opening is not open) It is sectional drawing of the state which the opening scheduled part in 1st Embodiment opened. It is a side view which shows the usage condition of the airbag apparatus which is 2nd Embodiment of this invention. It is CC sectional drawing of FIG. 7 of the opening part in 2nd Embodiment. It is sectional drawing of the state which the diameter of the opening part in 2nd Embodiment expanded.

  Hereinafter, a first embodiment in which an airbag device of the present invention is embodied will be described with reference to FIGS. In the following description, the forward direction of the vehicle will be described as the front (front of the vehicle), and the reverse direction of the vehicle will be described as the rear (rear of the vehicle). In the following description, the left-right direction is the vehicle width direction of the vehicle and coincides with the left-right direction when the vehicle moves forward.

  As shown in FIGS. 1 and 2, the airbag device S <b> 1 of the first embodiment has a vehicle outer side O in the seat back 2 of a seat (seat) 1 on which an occupant M as a restrained object is seated (the The right side) 2a.

  A seat frame 3 is disposed on the seat back 2 along a substantially vertical direction. The airbag device S1 is fixed to the seat frame 3 by attaching a bolt (not shown) protruding from the diffuser 11 of the inflator 10 with a nut and attaching the rear end of the airbag body 15 using the mounting bracket 21. ing. In addition, as members given the reference numerals shown in FIG. 2, 4 is a cushion, and 5 and 6 are skins made of decorative cloth or the like. Furthermore, the edge 4a on the right side (vehicle outer side O) of the cushion 4 covers the airbag device S1 from the front side to the vehicle outer side O. The edge portion 4 a is pushed by the airbag body 15 when the airbag body 15 is inflated, and is separated from the central portion 4 b of the cushion 4. Further, the cushion 4 is provided with a concave portion 4c in order to make the separation position from the central portion 4b of the edge portion 4a constant when the airbag body 15 is inflated. In the case of the embodiment, the space between the cushion 4 and the seat frame 3 constitutes a storage portion P1 that can store the folded airbag body 15 and the inflator 10 (see FIG. 2).

  In the case of the embodiment, the airbag device S1 includes a folded airbag body 15 and an inflator 10 that supplies inflation gas to the airbag body 15.

  As shown in FIGS. 1 to 3, the inflator 10 is a cylinder type whose outer shape is a substantially cylindrical shape and whose axial direction is substantially along the seat frame 3. The inflator 10 is configured to have a gas discharge port (not shown) on the upper end side, and a portion in the vicinity of the gas discharge port is coupled to a connection port portion 18 (to be described later) of the airbag body 15 using a clamp 13. This is a configuration. The inflator 10 is held by a sheet metal diffuser 11 and is attached to the seat frame 3 by fastening a bolt (not shown) provided on the diffuser 11 to the seat frame 3 with a nut.

  As shown in FIG. 3, the airbag main body 15 is formed into a bag shape, and is configured to protrude upward from a rear lower end of the general portion 12 and a general portion 12 that is inflated by inflating gas into the interior. And a cylindrical connection port 18. The connection port 18 is configured such that the lower end side is opened so that the inflator 10 can be inserted. In addition, the airbag main body 15 has an elongated attachment piece portion 21a along the vertical direction and a plurality of bolts 21b arranged along the vertical direction so as to protrude from the attachment piece portion 21a. A mounting bracket 21 comprising: a bolt 21b of the mounting bracket 21 projecting outward from the rear end side of the airbag body 15, and the nut 21 being fixed to the seat frame 3 with a nut 22; Is attached to the seat frame 3. The airbag body 15 includes a vehicle interior side wall portion 16a disposed on the vehicle interior side and a vehicle exterior wall portion 16b disposed on the vehicle exterior side when the airbag body 15 is completely inflated. In the case of the form, the expansion completion shape when the inflation gas discharged from the inflator 10 is caused to flow into the interior is expanded to a size capable of restraining the chest B of the occupant M seated on the seat 1. .

  Moreover, the airbag main body 15 is made of a synthetic resin, and in the case of the embodiment, the airbag body 15 is integrally formed by blow molding so that the shape at the time of completion of expansion is formed. That is, in the case of the embodiment, the airbag main body 15 is formed so as to have a thickness at the time of completion of inflation by separating the vehicle inner wall portion 16a and the vehicle outer wall portion 16b. The outer side wall portion 16b is folded together to be folded and stored in a storage portion P1 surrounded by the cushion 4 and the seat frame 3. In the case of the embodiment, the airbag main body 15 is roll-folded so that the front end side when the inflation is completed approaches the rear end side, and is stored in the storage portion P1 (see FIG. 2). The airbag body 15 is supplied with an inflation gas when the inflator 10 is operated, and is unfolded and unfolded while protruding from the storage portion P1, and restored to the outer shape at the time of molding. The vehicle inner side wall portion 16a and the vehicle outer side wall portion 16b are separated from each other to complete the expansion.

  In the case of the embodiment, when the airbag body 15 restrains the occupant M after the inflation of the airbag body 15 is completed, the vehicle interior side wall portion 16a as the peripheral wall 16 constituting the airbag body 15 and the vehicle exterior wall The portions 16b are configured to be plastically deformable so as to be extended. Specifically, in the case of the embodiment, when the airbag main body 15 receives the occupant M, the internal pressure of the airbag main body 15 due to partial pressing by the occupant M or a decrease in volume when the occupant M is restrained. As the tensile force is generated in the vehicle interior side wall portion 16a and the vehicle exterior wall portion 16b constituting the peripheral wall 16 of the airbag body 15, the vehicle interior side wall portion 16a and the vehicle exterior wall portion 16b are stretched. It will be plastically deformed. After the airbag body 15 is completely inflated, the airbag body 15 is disposed with the surface on the vehicle outer side (vehicle outer wall portion 16b) substantially along the vertical direction as a vehicle body side member located on the vehicle outer side. When the occupant M is received while being supported by the door trim 8, a tensile force (tensile stress) to be stretched uniformly acts on the vehicle inner wall portion 16 a and the vehicle outer wall portion 16 b, The airbag body 15 is plastically deformed from the inflated state to the enlarged area 17 as shown by a two-dot chain line in FIG. 1 and restrains the chest B of the occupant M.

  The airbag main body 15 according to the embodiment can easily fold the region of the inner wall portion 16a and the outer wall portion 16b of the peripheral wall 16 in a state in which repulsion during folding storage is suppressed, After the inflation gas is flowed into the vehicle to complete the inflation, the outer surface (the vehicle outer wall portion 16b) is supported by the door trim 8 and when the occupant M is received by the airbag body 15, In this configuration, the vehicle inner wall portion 16a and the vehicle outer wall portion 16b are plastically deformed so as to extend.

  The peripheral wall 16 is formed on the surface of the vehicle outer wall portion 16b and the general portion 12 composed of the vehicle inner wall portion 16a and the vehicle outer wall portion 16b, and is closed until the airbag body 15 is in an inflated state. When the vehicle interior side wall portion 16a receives the chest B of the occupant M in the inflated state, the internal pressure in the airbag body 15 rises and the vehicle exterior wall portion 16b is extended to be opened. The unit 19 is configured.

  In the case of the embodiment, as shown in FIGS. 3 and 4, the planned opening portion 19 is formed in the vicinity of the front end portion on the upper side of the vehicle outer side wall portion 16 b. Since the airbag body 15 is formed by blow molding as described above, the general portion 12 and the planned opening portion 19 are formed integrally and continuously using the same synthetic resin material. Yes. The planned opening portion 19 has a conical shape (substantially V-shaped in section) that tapers from the root portion 19a connected to the general portion 12 of the vehicle outer side wall portion 16b not facing the occupant M toward the vehicle outer side. ) And the tip is the tip 19b with the smallest thickness. (See Figure 5)

And it is desirable to make the angle of the front-end | tip part 19b of the scheduled opening part 19 which protruded in the cross-sectional substantially V shape smaller than 90 degree | times, and is set to 90 degree | times in embodiment. The angle of the tip 19b is preferably 45 to 90 degrees. Further, the thickness of the planned opening portion 19 is smaller than the thickness of the general portion 12, and in the case of the embodiment, the thickness of the general portion 12 is 0.5 mm, whereas the thickness of the planned opening portion 19 is the root. The thickness of the portion 19a is substantially the same as the thickness of the general portion 12, but is set so that the thickness gradually decreases toward the tip portion 19b having a substantially V-shaped cross section, and is 0.3 mm at the tip portion 19b. It is formed as follows. In addition, in the front-end | tip part 19b, the protrusion is made into small R shape.

  In the airbag main body 15, the inflation gas from the inflator 10 flows into the airbag main body 15 when the vehicle collides, and the airbag main body 15 is inflated. At this time, the airbag main body 15 is extended to the enlarged area 17 as described above. The planned opening portion 19 is stretched by the stretching of the airbag body 15, and is stretched so that the angle of the tip portion 19b formed at 90 degrees before the inflation is increased, and stress is applied to the tip portion 19b having the smallest thickness. Are concentrated in the opening preparation state (see the two-dot chain line in FIG. 6). At this time, the planned opening portion 19 has a distal end portion 19b that is extended and has a substantially V-shaped cross section, but has a substantially circular cross section.

When the occupant M is received by the airbag main body 15 in the opening preparation state, the chest B of the occupant M presses the vehicle interior side wall portion 16a and the internal pressure in the airbag main body 15 increases, Further stretched, further stress concentration occurs at the distal end portion 19b, the planned opening portion 19 is cleaved to form an opening, and the inflation gas flows out to the outside of the airbag body 15 ( (See FIG. 6). In this way, an excessive repulsive force is not applied to the chest B of the occupant M restrained by the airbag body 15, and the airbag body 15 receives the pressing force on the chest B of the occupant M and absorbs the shock. It is possible to exert an appropriate restraining force. Further, as another form, the planned opening portion 19 in the opening ready state has a front end portion 19b that is broken before the occupant M is received by the airbag body 15, and is opened. It can also be set as the aspect expanded.

  In the first embodiment, the planned opening portion 19 is formed in a conical shape. However, if the cross section is substantially V-shaped, it may be a polygonal pyramid shape such as a triangular pyramid or a quadrangular pyramid. In the embodiment, the thickness is formed so that the thickness gradually decreases from the root portion 19a connected to the general portion 12 to the tip portion 19b. However, when the airbag body 15 is inflated, stress is concentrated at the tip portion 19b to form an opening. The thickness may be a substantially constant thickness from the root portion 19a to the tip portion 19b. Even in this case, the tip portion 19b has a pyramidal apex, as in the embodiment. Due to the expansion of the peripheral wall 16 (the vehicle inner wall portion 16a and the vehicle outer wall portion 16b) due to the expansion of the main body 15, stress concentration occurs at the distal end portion 19b, and the airbag main body 15 receives the chest B of the occupant M. By, so that the tip 19b is opened. Further, the same effect can be obtained from the root portion 19a to the tip portion 19b even if a step portion is provided so that the thickness of the tip portion 19b is small. Further, in the embodiment, the section of the planned opening portion 19 is formed so as to be substantially V-shaped, but it is also possible to make the section of the tip end portion 19b arc-shaped and the section of the planned opening portion 19 is substantially dome-shaped. Can sell the effect.

  Next, a second embodiment in which the airbag device of the present invention is embodied will be described with reference to FIGS.

  The airbag apparatus S2 of the embodiment is also the same as the first embodiment, and the vehicle exterior side O in the seat back 2 of the seat (seat) 1 on which the occupant M as a restrained object is seated (right side in the case of the embodiment) It is arrange | positioned on the side surface 2a of (refer FIG. 7). Therefore, parts common to the first embodiment will be described using the same reference numerals, and different parts from the first embodiment will be described.

  In the embodiment, as shown in FIG. 8, an opening 29 is formed in the vicinity of the upper front end portion of the vehicle body outer wall portion 16 b of the airbag body 15. The opening 29 forms a conical protrusion 28 having a substantially V-shaped cross section when the airbag body 15 is formed by blow molding in the same manner as in the first embodiment. The top portion can be formed by cutting so that a predetermined opening is formed. In addition, the shape of the protrusion part 28 can be made into the same shape as the scheduled opening part 19 of 1st Embodiment. In addition to the above, the opening 29 can also be formed by previously providing a projection corresponding to the opening 29 in the molding die.

  The protrusion 28 is formed integrally and continuously using the same resin material as that of the airbag body when the airbag body 15 is blow-molded. And as shown in FIG. 8, the base part 28a is connected with the general part 12 of the vehicle outer side wall part 16b, has the same thickness as the general part 12, and gradually decreases in thickness toward the distal end side 28b.

  Then, when the inflator 10 is actuated at the time of a side collision of the vehicle, the inflation gas is supplied into the airbag body 15 and the airbag body 15 is expanded. At this time, the opening 29 has a small diameter in the initial stage of inflation of the airbag body 15, and the diameter gradually increases as the vehicle outer wall portion 16 b is stretched as the inflation proceeds. Therefore, since the diameter of the opening 29 is small in the middle of the expansion, the inflating gas has a small outflow amount even if the inflating gas flows out of the airbag body 15 from the opening 29. This does not hinder the smooth expansion of the airbag body 15. In addition, since the protrusion part 28 is gradually reduced in thickness from the root part 28a toward the tip part 28b, the protrusion part is smoothly extended as the airbag body 15 is inflated.

  In the state where the airbag body 15 is completely inflated, the diameter of the opening 29 is maximum as shown in FIG. In this state, when the chest B of the occupant M is received by the vehicle interior side wall portion 16a of the airbag body 15, the chest B presses the airbag body 15 to increase the internal pressure of the airbag body 15, and the inflation gas. However, it flows out smoothly to the outer side of the airbag body 15, and the chest B can be properly restrained by the airbag body 15.

  In the embodiment, the shape of the projecting portion is a conical shape having a substantially V-shaped cross section. However, if the cross section is a substantially V-shaped, a polygonal pyramid shape such as a triangular pyramid shape or a quadrangular pyramid shape, The portion 28b may be a dome shape having a substantially circular cross section. In the embodiment, the thickness is gradually reduced from the root portion 28a to the tip portion 28b. However, even when the thickness from the root portion 28a to the tip portion 28b is substantially constant, as in the embodiment. When the airbag body 15 is inflated, the vehicle outer side wall portion 16b is extended, the opening diameter of the opening 29 is expanded, and the chest B of the occupant M is received by the vehicle outer side wall portion 16b. it can.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Cushion 12 General part 15 Airbag main body 16 Peripheral wall 16a Car side wall part 16b Car outer side wall part 19 Opening part 19a Root part 19b Tip part 28 Protrusion part 28a Root part 28b Tip part 29 Open part B Chest part M Crew S1, S2 Airbag device

Claims (9)

While being stored in the storage part, when operating, it expands by inflating an inflating gas inside,
A bag-shaped airbag body having a bag-shaped airbag body capable of receiving an object to be restrained and having a peripheral wall made of a sheet-shaped synthetic resin is caused by inflow of inflation gas generated by a gas generator. An inflatable resin airbag device comprising:
The airbag body is made of a synthetic resin having a sheet-like peripheral wall, and the peripheral wall is plastically deformed so as to be stretched when the restraint object is restrained after the inflation of the airbag body is completed. It is configured to
The peripheral wall is closed at a normal time when the airbag main body is not inflated, and a general portion constituting a wall portion of the airbag main body inflated by the inflation gas flowing in, and the inflation gas flows in An opening that is opened by being cleaved when inflated, and is configured to open the inflation gas to the outside of the bag-shaped airbag body; and
The airbag device according to claim 1, wherein the general portion and the planned opening portion are formed of the same synthetic resin material continuously and integrally.   The airbag device according to claim 1, wherein the planned opening portion is a thin portion having a thickness smaller than that of the general portion of the airbag body.   The planned opening portion is a protruding portion that protrudes toward the outer side of the airbag body from a root portion that is coupled to the general portion, and the thickness of the tip of the protruding portion is described as the general portion of the airbag body. The airbag device according to claim 1, wherein the thinned portion is smaller.   The protruding portion is formed in a substantially V-shape that tapers from the root portion connected to the general portion toward the outer side of the airbag body, and the thickness of the tip portion is larger than the thickness of the root portion. The airbag device according to claim 2 or 3, wherein the airbag device is made small.   5. The airbag device according to claim 3, wherein a thickness of the protruding portion is gradually reduced from the root portion toward the tip portion. While being stored in the storage part, when operating, it expands by inflating an inflating gas inside,
A bag-shaped airbag body having a bag-shaped airbag body capable of receiving an object to be restrained and having a peripheral wall made of a sheet-shaped synthetic resin is caused by inflow of inflation gas generated by a gas generator. An inflatable resin airbag device comprising:
The airbag body is made of a synthetic resin having a sheet-like peripheral wall, and the peripheral wall is plastically deformed so as to be stretched when the restraint object is restrained after the inflation of the airbag body is completed. It is configured to
The peripheral wall is capable of flowing out the inflation gas from the inner side to the outer side of the inflated airbag body, and the general part constituting the wall portion of the airbag body inflated by the inflation gas flowing in An opening, and
The airbag device is characterized in that the opening area of the opening is expanded from the normal time when the airbag main body is not inflated by extending the general portion with the inflow of the inflation gas. .   The projecting portion projecting outward from the airbag body is formed in the general portion, and the opening is formed at a tip portion of the projecting portion. The airbag apparatus as described.   The protruding portion is formed in a substantially V-shape that tapers from the root portion connected to the general portion toward the outer side of the airbag body, and the thickness of the tip portion is larger than the thickness of the root portion. The airbag apparatus according to claim 7, wherein the airbag apparatus is made small.   9. The airbag device according to claim 1, wherein the airbag device is normally stored by folding the airbag main body in a storage portion in a vehicle seat, and inflow of inflation gas. Occasionally, an occupant seated on the seat expands and expands in the lateral direction of the vehicle, and the planned opening or the opening is formed on the side of the vehicle that does not face the occupant. An airbag device characterized by comprising: