JP5380187B2 - Airbag device, vehicle occupant leg protection device and vehicle-side collision occupant protection device using the airbag device - Google Patents

Description

  The present invention provides an airbag device for quickly absorbing a collision energy by pressing a leg portion of an occupant or protecting a side portion of the occupant and a vehicle occupant leg protection using the airbag device at the time of an automobile collision. The present invention relates to a device and a vehicle-side collision occupant protection device.

  An airbag device for a vehicle includes an airbag built in a predetermined portion (a steering wheel, a passenger seat panel, etc.) in a vehicle interior, an inflator for supplying high-pressure gas to the airbag, and a vehicle collision It consists of an acceleration sensor or the like that detects In the event of a vehicle collision, the inflator is ignited by an ignition signal from the acceleration sensor, high pressure gas is generated, and the airbag is instantly inflated to prevent the occupant from colliding with the steering wheel or the panel.

As such an airbag device, a knee airbag device that can quickly restrain a leg of a front seat (driver seat / passenger seat) occupant and absorb energy at the time of a car collision has been put into practical use.
As a knee airbag of such a knee airbag device, there are a fabric (bag body) knee airbag using a woven fabric and a plastic knee airbag made by blow molding or injection molding.

  Since the fabric airbag is applied with fabric tension, it is difficult to set the shock absorption capacity to receive the knee, and a huge development cost is required to optimize the collision energy absorption.

  Also, if not properly deployed, it will hit the lower shin of the occupant in the process of deployment, enter into the occupant's knees, or open the leg in the case of a small occupant. In this case, the occupant's knees are urged to be pressed against the vehicle floor.

As a result, the knee airbag itself, which should protect the occupant's legs, may apply excessive bending load to the bones under the knees, or enter the occupant's knees and open the legs to provide sufficient protection. The following are not restrained:
On the other hand, when the knee is lifted by the impact G when the toe board is retracted, the knee airbag is prevented from being lifted by the deployed knee airbag, and as a result, there is a risk of causing damage such as tibial fracture, rib fracture, and ligament breakage. there were.

  Regarding the plastic knee airbag, Patent Document 1 discloses an extended position in which an elongated body is connected to a gas discharge unit, and the elongated body is held in a high pressure state by releasing gas, and a face portion restrains an occupant's lower limb. Discloses an automobile glove box assembly projecting outward.

  Patent Document 2 and Patent Document 3 are expandable knee bolsters for vehicle occupants that are mounted to face the vehicle occupant's knees, with profile elements having at least partially foldable undulations expanded. Along with the inflator operation, the bolster pressurizes the expandable airbag inner portion so that at least a part of the profile element having pleated undulations is folded. An expandable knee bolster has been disclosed in which the chamber volume is expanded in a deformable state and the outer surface protrudes outward to an extended position.

US Pat. No. 6,758,493 US Pat. No. 6,213,497 US Pat. No. 6,619,689

When the occupants have different physiques, such as a large occupant and a small occupant, the inertial load applied at the time of collision is different, and the amount of energy absorption required differs accordingly.
However, in the plastic knee airbag disclosed in Patent Documents 1 to 3, even if the knee part of the occupant hits a different position such as the upper part or the lower part of the outer cover due to the difference in physique, it is uniformly from the inflator. Depending on the internal pressure, it is structured to receive impact force.
Therefore, in the plastic knee airbag disclosed in Patent Documents 1 to 3, appropriate energy absorption according to the difference in the occupant's physique is not performed, and the reaction force is insufficient for large passengers. On the other hand, a small passenger has a drawback that a good passenger protection performance cannot always be obtained as the reaction force becomes excessive.

  In view of the above problems, the present invention provides an airbag device capable of improving the degree of freedom of reaction force setting due to a difference in the occupant's physique, a vehicle occupant leg protection device and a vehicle side collision occupant protection device using the airbag device. The purpose is to provide.

The airbag apparatus of the present invention includes an inflator that supplies gas into a sealed space formed by an airbag inner and an inflator case, and the airbag inner includes a plurality of folded cylinder portions, and the inflator In an airbag device in which the tip portions of a plurality of cylinder portions folded by gas generated from the gas move in a direction in which they expand and expand so as to absorb shock, gas supplied from an inflator is supplied to one or a group of cylinder portions A first gas flow path and a second gas flow path to be supplied to another or another group of cylinder parts are formed, and the second gas flow from the first gas flow path by the gas pressure supplied from the inflator A gas flow restriction wall is provided to prevent gas from flowing from the first gas flow path to the second gas flow path until gas can flow into the channel. The features.

Further, the airbag device of the present invention includes an air bag inner, an outer cover attached to the air bag inner, an inflator case to which the air bag inner is attached, and an airtight formed by the air bag inner and the inflator case. An inflator that supplies gas into the space, and the airbag inner includes a plurality of folded cylinder parts, and further supplies a gas supplied from the inflator to one or a group of cylinder parts. A gas flow from the first gas flow path to the second gas flow path is formed by the gas pressure supplied from the inflator to form a flow path and a second gas flow path to be supplied to another or another group of cylinder portions. A gas flow restricting wall that prevents gas from flowing from the first gas flow path to the second gas flow path until the inflow of Attached to each tip said outer cover of the cylinder portion, the direction in which a plurality of cylinder portions of a folded state by the gas generated from the inflator is shock-absorbable deployed extended outer cover is thus being moved.

An inflator that expands and extends the plurality of cylinder portions by supplying gas into the sealed space may be housed inside the sealed space.

  The one or a group of cylinders is an upper cylinder part disposed above, and the other or another group of cylinders is a lower cylinder part disposed below, and the expansion operation of the upper cylinder part is performed by the lower cylinder. This can precede the unfolding operation of the part.

  Each inflator case includes a plurality of airbag inners, a plurality of inflator case pieces corresponding to the plurality of airbag inners, and an inflator case formed integrally with each of the plurality of inflator case pieces. An air bag inner corresponding to one part is attached, and a metal inflator plate is attached to the center part of the inflator case so that a sealed space can be formed by the air bag inner, the inflator case and the inflator plate.

  The plurality of airbag inners may be a pair of airbag inners, and the inflator case may have a pair of inflator case pieces corresponding to the pair of airbag inners.

  You may make it mount | wear with the inflator attachment recessed part formed in the inflator case center part so that the one end part of an inflator may protrude outside the sealed space.

  It has almost the same planar shape as the outer shape of the airbag inner, has an insertion hole for inserting the cylinder part of the airbag inner, and is fastened so as to sandwich the airbag inner between the corresponding inflator case pieces. A metal ring can be attached.

  In the inflator case piece, a gas flow path communicating with the plurality of cylinder parts is formed, and the gas flow path formed in the central part of the inflator case may be communicated with the gas flow path formed in the inflator case piece part. it can.

  The gas flow paths communicating with the plurality of cylinder parts are a first gas flow path communicating with one or a group of cylinder parts and a second gas flow path communicating with the other or another group of cylinder parts. May be.

  The channel cross-sectional area of the first gas channel can be made larger than the channel cross-sectional area of the second gas channel.

  An orifice plate provided with an orifice can be disposed between the inflator case and the airbag inner.

  The tip of the cylinder part can be fixed to the outer cover with a plastic pin.

  The plastic pin may have a fall-preventing wall in which the diameter is integrally expanded outward from the base end portion.

  The outer cover may be a laminated structure having a plastic panel fixed to the front surface and / or a metal plate fixed to the back surface.

  A seal structure can be formed in the coupling region between the airbag inner and the inflator case.

  The airbag inner and / or cylinder part can be made of plastic, elastomer (TPO) or rubber.

  The plurality of cylinder portions may be made of an impact-absorbing plastic exhibiting an elongation of 20% to 50% or more in an environment of −30 ° C.

  The plurality of cylinder portions can be integrally formed with the airbag inner by injection molding.

  Each of the plurality of cylinder portions may be formed by blow molding.

  The vehicle occupant leg protection device of the present invention has a knee position that is set in advance as a knee position of an occupant seated on a seat in a vehicle interior by arranging the outer cover of the airbag device of the present invention on an instrument panel of a vehicle body. The direction (hereinafter simply referred to as “knee position”) is set as a direction in which a plurality of cylinder portions expand and expand so as to absorb shock.

  The vehicle-side collision occupant protection device of the present invention is characterized in that the airbag device of the present invention is disposed between a door of a vehicle body and a door trim, and an outer cover of the airbag device is disposed in the vicinity of the door trim.

  According to the airbag device of the present invention and the vehicle occupant leg protection device and the vehicle-side collision occupant protection device using the airbag device, the degree of freedom in setting the reaction force due to the physique difference of the occupant is improved with a simple structure. can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway cross-sectional view showing a state where an airbag device and a vehicle occupant leg protection device for a vehicle according to a first embodiment of the present invention are mounted on an automobile. (A) It is a partial side view which shows the position equipped with the airbag apparatus which concerns on 1st embodiment of this invention, and the passenger | crew lower limb protection apparatus for vehicles, and a passenger | crew's leg part. (B) It is a partial side view which shows the operation state of the airbag apparatus which concerns on 1st embodiment of this invention, and the passenger | crew's leg protection apparatus for vehicles, and the position of a passenger | crew's leg part. (A) It is a fragmentary perspective view which shows the state which equipped the airbag apparatus and vehicle occupant leg protection apparatus for vehicles which concerns on 1st embodiment of this invention in the motor vehicle, and the position of a passenger | crew's leg part. (B) It is a fragmentary perspective view which shows the operation state of the airbag apparatus which concerns on 1st embodiment of this invention, and the passenger | crew's leg protection apparatus for vehicles, and the position of a passenger | crew's leg part. It is a side view of the airbag apparatus which concerns on 1st embodiment of this invention. (A) It is a disassembled perspective view of the airbag apparatus which concerns on the 1st Embodiment of this invention. (B) It is another disassembled perspective view of the airbag apparatus which concerns on 1st embodiment of this invention. (A) It is another disassembled perspective view of the airbag apparatus which concerns on 1st embodiment of this invention. (B) It is another disassembled perspective view of the airbag apparatus which concerns on 1st embodiment of this invention. It is a fragmentary sectional view of an air bag device and an occupant leg protection device for vehicles concerning other embodiments of the present invention. It is a disassembled perspective view of the airbag apparatus which concerns on 1st embodiment of this invention. FIG. 8B is a sectional view taken along line B-B. (A) It is sectional drawing of FIG. 8A-A. (B) It is a perspective view which shows the operating state of the airbag apparatus which concerns on 1st embodiment of this invention. It is a schematic diagram which shows the various shapes of the cylinder part of the airbag apparatus which concerns on this invention. It is a graph of the nominal stress-nominal strain curve which shows the result of having performed the high-speed tension test at various temperatures about the shock absorbing plastic. (A) It is FIG. 8A-A sectional drawing which shows the state at the time of the action | operation start of the airbag apparatus which concerns on 1st embodiment of this invention. (B) It is sectional drawing of FIG. 8A-A which shows the state in the middle from the operation | movement start of the airbag apparatus which concerns on 1st embodiment of this invention to the completion | finish of operation | movement. (C) It is FIG. 8A-A sectional drawing which shows the state of the completion | finish of operation | movement of the airbag apparatus which concerns on 1st embodiment of this invention. It is a fragmentary sectional view of the airbag apparatus which concerns on 2nd embodiment of this invention. It is a perspective view of the airbag apparatus which concerns on 3rd embodiment of this invention. It is a disassembled perspective view of the airbag apparatus which concerns on 3rd embodiment of this invention. It is another perspective view of the airbag apparatus which concerns on 3rd embodiment of this invention. It is a disassembled perspective view of the airbag apparatus which concerns on 3rd embodiment of this invention. It is another disassembled perspective view of the airbag apparatus which concerns on 3rd embodiment of this invention. It is a disassembled perspective view of the airbag apparatus which concerns on 4th embodiment of this invention. It is a fragmentary sectional view of the airbag apparatus which concerns on 4th embodiment of this invention. (A) It is a disassembled perspective view of the airbag apparatus which concerns on 5th embodiment of this invention. (B) It is another disassembled perspective view of the airbag apparatus which concerns on the 5th embodiment of this invention. (A) It is another disassembled perspective view of the airbag apparatus which concerns on 5th embodiment of this invention. (B) It is another disassembled perspective view of the airbag apparatus which concerns on 5th embodiment of this invention. It is a disassembled perspective view of the airbag apparatus which concerns on the 6th Embodiment of this invention. (A) It is a perspective view of the airbag apparatus which concerns on the 6th embodiment of this invention. (B) It is a fragmentary sectional view of the airbag apparatus which concerns on the 6th embodiment of this invention. It is explanatory drawing explaining operation | movement of the airbag apparatus which concerns on the 6th Embodiment of this invention. It is a fragmentary perspective view of the door of the motor vehicle equipped with the vehicle side collision passenger protection device which uses the airbag apparatus which concerns on 1st Embodiment-6th Embodiment of this invention. It is sectional drawing of the door of the motor vehicle shown in FIG. It is a partial exploded perspective view of the airbag apparatus which concerns on the 7th Embodiment of this invention.

Hereinafter, an airbag device according to a first embodiment of the present invention and a vehicle occupant leg protection device using the airbag device will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the vehicle body 1 includes an instrument panel 3 on the front side of the driver seat 2 in the vehicle traveling direction. An opening (not shown) for inserting the steering column 4 is formed on the driver's seat 2 side of the instrument panel 3, and the steering column 4 is disposed in a state of being tilted forward through the opening.

  The front panel 5 of the instrument panel 3 is positioned in front of the left leg 6A and the right leg 6B of the occupant 6 seated in the driver's seat 2. The instrument panel 3 includes an airbag device 7 on the inner side thereof, and the airbag device 7 is disposed on the upper front side of the seat cushion 8 of the driver's seat 2 in the vicinity of the periphery of the steering column 4. Therefore, the knee portions of the left leg portion 6A and the right leg portion 6B of the occupant 6 are positioned facing the airbag device 7 in a state where the occupant 6 seated in the driver's seat 2 takes a driving posture.

  As shown in FIGS. 4 to 7, the airbag device 7 has a substantially flat plate shape, and a plastic outer cover 9 whose upper outer surface is curved so as to follow the surface panel 5 of the instrument panel 3, and the outer cover 9. This also has a plastic airbag inner 10 and a metal inflator case 11 for assembling the airbag inner 10. The airbag inner 10 and the inflator case 11 form an airbag of the airbag device 7. Further, the front panel 5 of the instrument panel 3 and the outer surface of the outer cover 9 are substantially flush with each other.

  However, a thinned weakened portion (not shown) is formed around the outer cover 9, and when the airbag device 7 operates, the weakened portion is broken and the outer cover 9 is attached to the front panel 5. It protrudes in the position which restrains each of the left leg part 6A and right leg part 6B of the passenger | crew 6, respectively.

  The outer cover 9, the airbag inner 10, and the inflator case 11 of the airbag device 7 have substantially square outer shapes that can be assembled with each other. Further, one side of the outer shape of the square shape is cut out inward to the substantially central position of the square shape, and an outer cover escape portion 91 and an airbag inner escape portion 101 which are escape portions for inserting the steering column 4 respectively. The inflator case escape portion 111 is formed. The airbag device 7 configured by assembling the outer cover 9, the airbag inner 10, and the inflator case 11 includes the steering column 4 inserted through the outer cover escape portion 91, the airbag inner relief portion 101, and the inflator case relief portion 111. 4 is attached in the vicinity of the periphery.

  A plurality of, in the present embodiment, four cylinder portions 12, 12... Are integrally formed on the plastic airbag inner 10. A pair of upper cylinder parts 121, 121 arranged on both sides of the airbag inner relief part 101 among these four cylinder parts 12, 12... Are mutually connected with respect to the center line X of the airbag inner relief part 101. It is provided at a symmetrical position. Further, a pair of lower cylinder portions 122 and 122 are provided at positions symmetrical with respect to each other with respect to an extension line of the center line X of the airbag inner escape portion 101.

  Further, the airbag inner 10 is integrally formed with an edge 102 along the outer periphery of the substantially square main body. The edge portion 102 is formed in a form in which the outer peripheral portion of the substantially square main body of the airbag inner 10 is bent. The tip of the edge portion 102 faces the outer cover 9 when the airbag inner 10 is assembled with the outer cover 9.

  Similarly, the inflator case 11 is integrally formed with an edge 112 along the outer periphery of the substantially square body. The edge portion 112 is formed in a form in which the outer peripheral portion of the substantially square main body of the inflator case 11 is bent. The front end of the edge 112 faces the direction of the airbag inner 10 when the inflator case 11 is assembled with the airbag inner 10.

  The shape of the outer surface of the edge 102 of the airbag inner 10 described above substantially matches the shape of the inner surface of the edge 112 of the inflator case 11. Therefore, the edge portion 102 of the plastic airbag inner 10 can be fitted inside the edge portion 112 of the metal inflator case 11 elastically or within the plastic deformation limit.

  Further, in the state in which the airbag inner 10 and the inflator case 11 are assembled with the edge portion 102 of the airbag inner 10 fitted inside the edge portion 112 of the inflator case 11, A number of rivet holes 104, 104... Are formed in the vicinity of the outer periphery of the side surface 103 along the inside of the edge portion 102.

  On the other hand, with the edge 102 of the airbag inner 10 fitted inside the edge 112 of the inflator case 11 and the airbag inner 10 and the inflator case 11 assembled, the inside of the airbag of the inflator case 11 serving as the inner side An inflator mounting recess 113 is formed on the side surface so as to be recessed in a direction opposite to the protruding direction of the edge 112. A step 114 is formed between the inflator mounting recess 113 and the edge 112. That is, the inflator mounting recess 113 has a planar shape similar to the outer shape of the airbag inner 10 and the inflator case 11, and a stepped portion 114 is formed therearound. A number of rivet holes 115, 115... Are formed in the stepped portion 114 along the inside of the edge portion 112.

  The rivet holes 104, 104,... And the rivet holes 115, 115,. As a result, when the airbag inner surface 103 and the stepped portion 114 are in direct contact with each other and the airbag inner 10 is assembled to the inflator case 11, the rivet holes 104, 104,. The rivet holes 115 and 115 formed in the step portion 114 are aligned in a one-to-one relationship in a one-to-one relationship, and a large number of aligned rivet holes 104 are formed along the inside of the edge portion 102 and the edge portion 112. , 115 pairs are formed. Accordingly, the rivets 13, 13,... Can be inserted into the pair of rivet holes 104, 115 aligned with each other, and the airbag inner 10 and the inflator case 11 can be riveted to each other along the outer periphery thereof. .

  In such a state where the airbag inner 10 and the inflator case 11 are riveted and the airbag inner 10 is assembled to the inflator case 11, the outer surface of the edge portion 102 of the airbag inner 10 and the edge portion 112 of the inflator case 11. The inner side surface of the airbag inner 10 is in airtight contact with the inner side surface 103 of the airbag inner 10 and the step 114 of the inflator case 11 is in airtight contact with each other, so that the inner space between the airbag inner 10 and the inflator case 11 is airtight. Is kept airtight.

  .. Around the rivet holes 104, 104... Provided in the airbag inner surface 103 of the airbag inner 10 are provided with ribs 14 integrally formed with the airbag inner surface 103 as shown in FIG. be able to. By providing the ribs 14 in this way, the rigidity around the rivet holes 104, 104... Is improved, and the airbag inner 10 and the inflator case 11 are attached to each other and the inner airtightness between them is more reliably ensured. can do.

As shown in FIGS. 8 and 9, the airbag inner side surface 103 of the airbag inner 10 has an inflator storage recess 16 for storing the inflator 15 so as to dig down the position near the bottom of the airbag inner escape portion 101 into a rectangular shape. Provided. The inflator housing recess 16 is extended to both sides so as to bypass the airbag inner escape portion 101 to form a first gas flow path 17 that is a recess extending between the upper cylinder portions 121 and 121. .
An airbag inner side surface 103 between the lower cylinder portions 122 and 122 serves as a second gas flow path 18.

  A gas flow regulating wall 19 is erected on the airbag inner surface 103 along the first gas flow path 17. The gas flow regulating wall 19 is formed between the opposing edge portions 102 so that one end is continuous with one edge portion 102 and the other end is continuous with the other edge portion 102. The distance (h1) between the front end of the gas flow regulating wall 19 and the airbag inner surface 103 is the same as the distance (h2) between the bottom surface of the inflator mounting recess 113 and the top surface of the stepped portion 114 of the inflator case 11, or h1 is h2. It is made to be slightly larger than.

  Therefore, in a state where the airbag inner 10 and the inflator case 11 are riveted and the airbag inner 10 is assembled to the inflator case 11, the gas flow regulating wall 19 of the airbag inner 10 is the bottom surface of the inflator mounting recess 113 of the inflator case 11. The tip is deformed within the elastic or plastic limit and brought into contact with it, and is positioned inside the inflator mounting recess 113. As a result, there is no gas flow between the first gas channel 17 and the second gas channel 18 in a normal state.

  Each of the four cylinder portions 12, 12... Of the airbag inner 10 is folded in a normal state and includes a plurality of collision energy absorbing flanges 20, 20... One gas flow path 17 and the second gas flow path 18 are arranged in an unstretched standby state, one at each end.

  However, each of the four cylinder parts 12, 12... Is formed into a cylinder-like shape by extending a plurality of collision energy absorbing flange parts 20, 20. It has an outline. In this embodiment, the cylindrical outer shape is an outer shape formed by a paraboloid which is a curved surface obtained by rotating a parabola, which is a trajectory drawn by a parabolic motion of an object, about its axis of symmetry. That is, the cross section is a circular shape having a maximum diameter in the vicinity of the proximal end portion that is integrally continuous with the airbag inner 10, the circular diameter is reduced toward the distal end portion, and the distal end portion is a spherical top surface. ing. Through holes 21, 21... Are formed on the top surfaces of the spherical tip portions of the four cylinder portions 12, 12.

The above cylinder parts 12, 12... Can be adjusted by appropriately adjusting the energy absorption characteristics of the cylinder parts 12, 12. It can be carried out.
Moreover, the shape in the state which the cylinder parts 12, 12 ... extended | stretched can be suitably set by the relationship with the energy absorption characteristic required.
That is, in this embodiment, as shown in FIG. 11A, the outer shape of the cylinder parts 12, 12... Is formed by a paraboloid, but depending on the embodiment, the outer shape in the unfolded state is shown in FIG. As shown in FIG. 11B, the shape may be a right cylindrical shape, or as shown in FIG.

  The airbag inner 10 provided with the cylinder parts 12, 12... Is made of a shock absorbing plastic, and the cylinder part is formed by injection molding in which the shock absorbing plastic heated and fluidized is injected into the mold and cooled by the mold. The whole including 12, 12... Can be integrally formed.

  As this shock-absorbing plastic, there is known a shock-absorbing plastic that is a polymer alloy formed by reactive blending of nylon (PA) and a reactive polyolefin (for example, PEGMA). The impact-absorbing plastic is characterized by being deformed with a constant stress below a certain level to absorb impact energy and having a constant necking stress. Furthermore, even if it collides at high speed, it does not become hard but rather has a characteristic that it becomes soft. That is, this impact-absorbing plastic behaves as a softer material as the deformation speed increases, and the elongation at break (Eb) increases as the tensile speed increases (Polyfile 2006.4 page 28 “New Nylon Alloy: NOVA Softer as it is deformed at one high speed. See plastic).

  A cylindrical specimen having an outer diameter of 50 mm, a height of 150 mm, and a thickness of 2 mm is used as a sample of the shape of an automobile shock-absorbing component for this shock-absorbing plastic. A load of 193 kg and a collision speed of 11 are applied to the cylindrical specimen. According to a report of an impact test when dropping at a high speed under the conditions of 0.3 km / hr and collision energy of 945 J, the shock absorbing plastic is deformed flexibly as if the bellows was crushed, and the maximum point load is kept low. There is a large amount of energy absorption (see Plastic Age 90 2006 vol. 53 Sep., page 70, “Characteristics and Application Development of Shock Absorbing Plastics”).

FIG. 12 shows the results of a high-speed tensile test on the impact-absorbing plastic at −30 ° C., 23 ° C. and 85 ° C. As shown in the nominal stress-nominal strain curve of FIG. 12, the impact-absorbing plastic used in the present embodiment exhibits an elongation of about 20% to 50% even in an environment of −30 ° C. and is extensible even in a low temperature environment. It was confirmed to be excellent.
In this way, by using shock absorbing plastic that exhibits an elongation of about 20% to about 50% even in an environment of −30 ° C., an airbag device that operates stably regardless of climate change and destinations is configured. can do.

  On the other hand, the outer cover 9 is integrally formed with four connecting portions 22, 22... Protruding in the direction opposite to the direction of the driver's seat 2. Bolt holes 23, 23,... Are formed at the tips of the four connecting portions 22, 22. The positions of the four connecting portions 22, 22... Are in a one-to-one correspondence with the upper cylinder portions 121 and 121 and the lower cylinder portions 122 and 122 of the airbag inner 10.

  As a result, when the outer cover 9 is assembled to the airbag inner 10, the connecting portion between the insertion hole 21 and the outer cover 9 provided at the tip positions of the upper cylinder portions 121 and 121 and the lower cylinder portions 122 and 122 of the airbag inner 10. A continuous series of screw holes are formed by the insertion holes 21 and the bolt holes 23 by positioning so that the bolt holes 23 provided in each of 22, 22. . A screw 24 is screwed into each screw hole so that the tip of the paired cylinder portion 12 and the connecting portion 22 of the outer cover 9 are clamped by a nut and a collar (not shown). It can be assembled and fixed to the inner 10.

  An inflator 15 is fixed inside the inflator mounting recess 113 of the inflator case 11. The fixing position is a position facing the inflator housing recess 16 of the airbag inner 10 in a state where the airbag inner 10 is assembled to the inflator case 11, and the second gas flow path 18 with respect to the gas flow regulating wall 19. It is a position facing the first gas flow path 17 extended along the gas flow regulating wall 19 on the opposite side.

  The airbag device 7 and the vehicle occupant leg protection device of the present embodiment include an acceleration sensor (not shown) that detects a deceleration of the vehicle body 1 and detects a collision of the vehicle body 1, and the acceleration sensor includes a microcomputer. It is connected to a control circuit (not shown) provided.

Next, details of the operation of the airbag device 7 and the vehicle occupant leg protection device of the present embodiment will be described.
When the control circuit determines that the vehicle body 1 has collided with a signal from the acceleration sensor, the control circuit activates the inflator 15. When the inflator 15 is activated, gas is first ejected into the first gas flow path 17. The upper cylinder parts 121 and 121 are developed by the ejected gas.

  At that time, the outer side surface of the edge portion 102 of the airbag inner 10 and the inner side surface of the edge portion 112 of the inflator case 11 are in airtight contact, and the airbag inner side surface 103 of the airbag inner 10 and the step portion 114 of the inflator case 11 Since the inner space between the airbag inner 10 and the inflator case 11 is airtightly held, the upper cylinder portions 121 and 121 retain energy absorbing power equal to or higher than a certain pressure and absorb energy. Expanded as possible.

  When the upper cylinder portions 121 and 121 are deployed, the upper portion of the outer cover 9 fixed to the distal ends of the upper cylinder portions 121 and 121 via the connecting portions 22, 22... Is the left leg portion 6 </ b> A and the right leg portion 6 </ b> B of the occupant 6. It projects toward each knee to absorb energy.

Next, a gas flow toward the second gas flow path 18 is formed with a certain time lag.
As shown by a two-dot chain line in FIG. 9, the gas flow toward the second gas flow path 18 increases the internal pressure of the first gas flow path 17 by the gas ejected from the inflator 15, and the inflator case 11 This occurs when the gap is formed between the tip of the gas flow regulating wall 19 and the bottom surface of the inflator mounting recess 113 of the inflator case 11.

  When a gas flow toward the second gas flow path 18 is formed, the gas flows into the lower cylinder parts 122 and 122 arranged at both ends of the second gas flow path 18 and is developed, and the lower cylinder part 122 and 122 The lower part of the outer cover 9 fixed through the connecting portions 22 and 22 at the respective tip positions starts to protrude so as to absorb energy.

  In the above process, the collision energy absorbing flanges 20, 20... Of the upper cylinder parts 121, 121 and the lower cylinder parts 122, 122 are formed by a cylindrical outer shape, that is, a paraboloid, which is extended from the folded state. It is deformed so as to be able to absorb energy in a state where the outer shape is formed.

  In the airbag device 7 and the vehicle occupant leg protection device of the present embodiment described above, a group of cylinder portions 12 that individually operate is provided, and the upper cylinder portions 121 and 121 are deployed so that the upper portion of the outer cover 9 can absorb energy. Since the time lag is structurally set to the behavior of starting protrusion and the behavior of the lower cover 9 starting to protrude so that the lower portion of the outer cover 9 can absorb energy by the expansion of the lower cylinder portions 122, 122, the inertia load at the time of collision is large. The occupant's knee is reliably protected by the impact absorbing action during a collision by the entire upper cylinder 121, 121 and lower cylinder 122, 122.

  On the other hand, in the case of a small occupant having a small inertial load at the time of collision, the shock absorbing position by the outer cover 9 with respect to the knee is lower than that of a large occupant depending on the difference in physique. As a result, loads from the upper cylinder parts 121 and 121 and the lower cylinder parts 122 and 122 are distributed at an appropriate ratio according to the difference in the occupant's physique and applied to the occupant, and impact shock absorption is performed.

  Accordingly, it is possible to realize an appropriate energy absorbing operation corresponding to the difference in the physique for each of a large occupant and a relatively small occupant that absorbs a large amount of energy during a collision.

  Moreover, in order to realize this, it is not necessary to individually arrange a plurality of knee airbag devices, and only one airbag device 7 of the present invention may be used. Therefore, it is easier than a case where a plurality of knee airbags are individually arranged. Moreover, the setting of such a time lag is not particularly performed by electronic control, but is performed structurally, and is reliably and inexpensively realized.

In addition, unlike the large-capacity integrated airbag, each of the plurality of cylinder portions 12 that operate in conjunction with each other through a time lag has a small capacity, so that the response operation is fast and the occupant's lower limbs can be reliably restrained and protected. .
In this regard, in the case of an integrated airbag having a large capacity, when the airbag is extended and deployed, a large amount of gas is inevitably sent, and as a result, the deployment speed becomes slow. However, in the airbag device 7 and the vehicle occupant leg protection device of the present embodiment, since the plurality of cylinder portions 12 operate in conjunction with each other through a time lag with one inflator 15 serving as a single gas source, The volume of the cylinder portion 12 can be reduced, and the overall deployment speed can be increased.

  Moreover, since the protrusion length at the time of deployment can be adjusted for each cylinder part 12, an energy absorbing operation by appropriate deployment according to the state of the occupant at the time of the vehicle collision can be realized.

Next, an airbag device and a vehicle occupant leg protection device according to a second embodiment of the present invention will be described with reference to FIG.
In the airbag apparatus according to the second embodiment, other configurations are the same as those of the airbag apparatus according to the first embodiment, and the outer peripheral edge portion 102 on the side surface to be assembled with the inflator case 11 of the airbag inner 10 is provided. A protrusion 25 is integrally formed on the inner side surface 103 of the airbag. Further, on the side surface of the inflator case 11 to be assembled with the airbag inner 10, along the outer peripheral edge 112 of the inflator case 11, the ridge 25 is fitted in the vicinity inside corresponding to the ridge 25. The groove part 26 which becomes a recessed part is formed integrally.

In the airbag device according to the second embodiment, the above-described protrusion 25 and the groove portion 26 constitute a seal structure along the outer peripheral edge portion 102 of the airbag inner 10 and the outer peripheral edge portion 112 of the inflator case 11.
Therefore, in a state where the airbag inner 10 and the inflator case 11 are riveted and the airbag inner 10 is assembled to the inflator case 11, the outer surface of the edge portion 102 of the airbag inner 10 and the inner surface of the edge portion 112 of the inflator case 11. 11 in an airtight manner, the airbag inner side surface 103 and the stepped portion 114 are in airtight contact, and the internal space between the airbag inner 10 and the inflator case 11 is hermetically maintained. The hermeticity is enhanced by the seal structure constituted by the protrusions 25 and the groove portions 26 fitted to each other.

Next, an airbag device and a vehicle occupant leg protection device according to a third embodiment of the present invention will be described with reference to FIGS.
The airbag device 7 of the third embodiment includes a pair of airbag inners 10a and airbag inners 10b which are separate parts. Correspondingly, the inflator case 11 has an inflator case piece 11a and an inflator case piece 11b of both wings, and is integrally formed so as to have an inflator case central part 11c at a position connecting them. The inflator case piece part 11a and the inflator case piece part 11b are formed in shapes corresponding to the airbag inner part 10a and the airbag inner part 10b, respectively. As a result, in the airbag device 7 according to the third embodiment, the airbag inner 10a and the airbag are placed on the inflator case piece 11a and the inflator case piece 11b located at positions corresponding to the lenses of the glasses-shaped inflator case 11. Gas is supplied from the inflator 15 into a sealed space formed by assembling the bag inners 10b.

  The inflator case central portion 11c is provided with a region widened outward (downward) at the center of the connecting portion between the inflator case piece 11a and the inflator case piece 11b, and the inflator mounting recess 113 is formed in the region widened outward (downward). Is formed. The inflator mounting recess 113 is formed so that the direction perpendicular to the left-right direction of the inflator case 11 coincides with the longitudinal direction of the inflator 15, and when the inflator 15 is attached to the inflator mounting recess 113, one end of the inflator 15 is inflated. The case 11 projects further outward (downward) than the edge of the widened region of the case 11.

A metal inflator plate 27 is attached to the center portion 11c of the inflator case. The inflator plate 27 is provided with an inflator mounting recess 271 at a position facing the inflator mounting recess 113 of the inflator case central portion 11c.
Therefore, when the inflator plate 27 is attached to the inflator case central portion 11c, the inflator 15 is attached to the cylindrical inflator attachment portion formed by the inflator attachment recess 113 and the inflator attachment recess 271 with the O-ring 28 in the center. It is attached with one end projecting outward.

A metal ring 29a and a ring 29b each having substantially the same planar shape as the outer shape of the airbag inner 10a and the airbag inner 10b are mounted on the airbag inner 10a and the airbag inner 10b, respectively.
Each of the rings 29a and 29b has insertion holes 291 and 292 through which the upper cylinder part 121 and the lower cylinder part 122 respectively included in the airbag inner 10a and the airbag inner 10b are inserted.
As shown in FIGS. 15 to 17, the ring 29 a and the ring 29 b are inserted into the insertion holes 291 and 292 through the upper cylinder part 121 and the lower cylinder part 122, respectively, and the main body planes of the airbag inner 10 a and the airbag inner 10 b, respectively. The airbag inner 10a and the airbag inner 10b are sandwiched between the ring 29a and the ring 29b and the inflator case piece 11a and the inflator case piece 11b, respectively.
In that state, the inflator case piece 11a, the airbag inner 10a and the ring 29a, and the inflator case piece 11b, the airbag inner 10b and the ring 29b are inserted into the rivet holes 115, 115. It is mutually concluded.

As shown in FIG. 18, a gas flow path 116 that is a recess extending between the inflator case piece part 11 a and the inflator case piece part 11 b is formed in the inflator case center part 11 c.
This gas flow path 116 becomes a path into which the gas supplied from the inflator 15 attached to the inflator case central part 11c flows.
On the other hand, in the inflator case piece part 11a and the inflator case piece part 11b, the first gas flow continuously extending to the position P1 corresponding to the upper cylinder part 121 formed in the airbag inner part 10a and the airbag inner part 10b. A second gas channel 117b extending from the first gas channel 117a and extending to a position P2 corresponding to the path 117a and the lower cylinder part 122 is formed.
The gas channel 116 of the inflator case 11 communicates with the first gas channel 117a and the second gas channel 117b.

The first gas flow path 117 a and the second gas flow path 117 b have a cross-sectional area larger than that of the first gas flow path 117 a serving as a gas passage to the upper cylinder part 121, and to the lower cylinder part 122. The second gas flow path 117b serving as the gas passage is set in a mutual relationship that it is smaller than that.
By doing in this way, the upper cylinder part 121 can be expanded ahead of the lower cylinder part 122.

  As shown in FIG. 19, the airbag inner 10a and the airbag inner 10b are assembled to the outer cover 9 at the tip positions of the upper cylinder portions 121 and 121 and the lower cylinder portions 122 and 122 of the airbag inner 10a and the airbag inner 10b. The plastic pin 31 is inserted into a series of pin holes formed by the provided insertion holes 21 and the pin holes 30 provided in each of the connecting portions 22 of the outer cover 9, and made of metal. The outer cover 9 is fixed to the airbag inner 10 by being locked to the stopper 32. In this way, since the tips of the upper cylinder parts 121 and 121 and the lower cylinder parts 122 and 122 are fixed to the outer cover 9 by the plastic pins 31, not only the weight of the metal bolt 24 is used, but also the overall weight can be reduced. The tip of each cylinder part 12 can be reduced in weight, and the deployment performance and response performance of each cylinder part 12 can be improved.

  The airbag inner 10a and the airbag inner 10b are formed by molding plastic or elastomer (TPO). When plastic or elastomer is used, the cylinder part 12 formed integrally with the airbag inner part is deployed at a lower internal pressure than when shock absorbing plastic is used, so the deployment performance and response performance of each cylinder part 12 are improved. can do. The airbag inner 10a and the airbag inner 10b can be made of rubber as necessary.

  When the upper cylinder part 121 and the lower cylinder part 122 are deployed by the gas supplied from the inflator 15, the airbag inner 10a or the airbag inner 10b can be prevented from being inflated. The deployment performance and response performance of the cylinder part 121 and the lower cylinder part 122 can be improved.

  In addition, a press-molded metal inflator plate 27 is mounted on the inflator case central portion 11c to form the first gas flow path 116 into which the gas supplied from the inflator 15 flows, so that the expansion around the vicinity of the inflator 15 is formed. Can be suppressed as much as possible, and pressure loss can be reduced, and rapid gas supply to each cylinder portion 12 becomes possible.

In the airbag device of the third embodiment, the gas supply amount supplied from the inflator 15 to each cylinder portion 12 is provided between the first gas passage 116 and the second gas passage 117 provided in the inflator case 11. Adjustment is possible with the cross-sectional area of the flow path, and the control of the deployment timing of each cylinder portion 12 can be easily and accurately performed.

Next, an airbag device and a vehicle occupant leg protection device according to a fourth embodiment of the present invention will be described with reference to FIGS.
In the airbag device of the fourth embodiment, an orifice plate 34 provided with orifices 33 between the inflator case piece 11a and the airbag inner 10a and between the inflator case piece 11b and the airbag inner 10b is further provided. Inserted and arranged. Other configurations are the same as those of the airbag device of the third embodiment. Therefore, in the airbag device according to the fourth embodiment, gas can be intensively ejected to the central portion of each cylinder portion 12 through the orifice 33, and the gas supply amount can be adjusted by setting the diameter of the orifice 33. it can.
Further, by arranging the orifice plate 34 in this way and adjusting the gas supply amount by setting the diameter of the orifice 33, the gas is intensively ejected to the central portion of each cylinder portion 12, and the airbag inner 10. Even when made of a relatively rigid material, each cylinder portion 12 can be more easily deployed, and the deployment performance and response performance can be improved.

Next, an airbag apparatus according to a fifth embodiment of the present invention will be described with reference to FIGS.
In the airbag apparatus according to the fifth embodiment, the outer cover 9 has the same structure as that of the airbag apparatus according to the third embodiment except that the outer cover 9 has a double structure or a laminated structure and the strength thereof is improved. It is.
In order to obtain a double structure or a laminated structure, a method of fixing the plastic panel 35 to the surface of the outer cover 9 by vibration welding or the like can be employed. Moreover, you may attach the metal plate 36 of the shape along the back surface shape to the back surface of the outer cover 9. FIG.

Next, an airbag apparatus according to a sixth embodiment of the present invention will be described with reference to FIGS.
In the airbag device of the sixth embodiment, the plastic pin 31 that joins the outer cover 9 and the cylinder part 12 has a protruding tip part 31a from the cylinder part 12 and a protruding part as shown in FIG. A structure having a fall-preventing wall 31b whose diameter is integrally expanded outward from the base end portion of the distal end portion 31a is adopted. Other configurations are the same as those of the airbag device of the third embodiment. As shown in FIG. 25B, the plastic pin 31 is attached to the tip of the cylinder portion 12 with the protruding tip portion 31a protruding from the tip of the cylinder portion 12 and the fall prevention wall 31b positioned on the inside of the tip of the cylinder portion 12.

As shown in FIG. 26 (b), in the process in which the knee contacts the outer cover 9 and the tip of the cylinder portion 12 is pushed inward into the cylinder portion 12 in the event of a collision, local distortion occurs in the vicinity of the tip of the cylinder portion 12. The tip of the section 12 collapses. However, in the airbag apparatus according to this embodiment, as shown in FIG. 26A, the plastic pin 31 is attached to the tip of the cylinder part 12 with the fall-preventing wall 31b positioned inside the tip of the cylinder part 12, so that Therefore, it is possible to prevent the tip of the cylinder part 12 from collapsing by suppressing the occurrence of local distortion.
As a result, it is possible to disperse stress over the entire cylinder portion 12 to smoothly compress the cylinder portion 12 and to smoothly absorb energy.

Next, a vehicle-side collision occupant protection device using the airbag device according to any one of the first to sixth embodiments of the present invention will be described with reference to FIGS. 27 and 28. To do.
In the present embodiment, the airbag device 7 is arranged in the vehicle interior side of the inner panel 202 of the door 201 and between the inner panel 202 and the door trim 203 in a mode in which the outer cover 9 is disposed in the vicinity of the rear surface of the door trim 203. Deploy. When the airbag device 7 is deployed at the time of a vehicle-side collision, the outer cover 9 pushes the door trim 203 toward the inside of the vehicle, ensuring a space between the occupant and the door 201 and protecting the occupant.

  In this embodiment, since the airbag apparatus 7 provided with the cylinder part 12 which operates via a plurality of time lags is arranged, the door trim 203 does not move excessively inside the vehicle. Moreover, the adjustment of the deployment timing of the airbag device 7 can be adjusted by the cylinder portion 12 that operates through a plurality of time lags. Therefore, the degree of freedom in adjusting the deployment timing of the airbag device 7 in relation to the entry speed of the door trim 203 that moves to the inside of the vehicle when the airbag device 7 is deployed is improved. The upper cylinder parts 121 and 121 and the lower cylinder parts 122 and 122 as a whole can be reliably protected by the impact absorbing action at the time of collision.

In particular, when a vehicle is subjected to an impact due to a side collision, there is no large intermediate area as in the engine room, and the impact transmission occurs instantaneously, and in response to this, the airbag apparatus needs to operate instantly. .
The plurality of small-capacity cylinder portions 12 of the airbag device 7 of the present embodiment operate in conjunction with each other via a time lag, so that the response operation is fast, and the occupant can be reliably restrained and protected even in a side collision. .

Next, an airbag apparatus according to a seventh embodiment of the present invention will be described with reference to FIG.
In the airbag device according to the seventh embodiment of the present invention, a plurality of small-capacity cylinder portions 12 of the airbag device 7 are molded in a tube shape from a melted shock-absorbing plastic or plastic and stored in a mold cavity. Then, it is made by blow molding in which compressed air is fed into a tube shape and then expanded and molded inside the mold.
In the case of this blow molding, as shown in FIG. 29, the main body portion of the airbag inner 10 is formed separately from the cylinder portion 12, and different from the main body portion of the airbag inner 10, depending on the specifications. Now, the lightweight cylinder portion 12 can be produced at low cost and efficiently at high speed. The main body portion of the airbag inner 10 can be commonly used for the lightweight cylinder portion 12 having various sizes and shapes.
A lightweight airbag device 7 can be produced at low cost efficiently and at high speed by joining the cylinder portion 12 to a common body portion of the airbag inner 10 via a joint portion 37 that can ensure high airtightness. .

  In the airbag device and the vehicle occupant leg protection device according to each of the above embodiments, the lower limb restraining positions of the left and right upper cylinder parts 121 and 121 and the lower cylinder parts 122 and 122 are absorbed at the same level in the vehicle longitudinal direction. It was set as the position where it became the ability. However, the lower limb restraining positions of the left and right upper cylinder portions 121 and 121 and the lower cylinder portions 122 and 122 can be set to different positions according to the posture, physique, seat arrangement angle, and the like of the occupant.

  The present invention has been described in detail with respect to specific embodiments. However, the present invention is not limited to the above-described embodiment, and it will be apparent to those skilled in the art that various other embodiments are possible within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Vehicle body, 2 ... Driver's seat, 3 ... Instrument panel, 4 ... Steering column, 7 ... Air bag apparatus, 9 ... Outer cover, 91 ... Outer cover escape part, DESCRIPTION OF SYMBOLS 10 ... Airbag inner, 101 ... Airbag inner escape part, 102 ... Edge, 103 ... Airbag inner surface, 104 ... Rivet hole, 11 ... Inflator case, 111. ..Inflator case relief part, 112 .. edge part, 113... Inflator mounting concave part, 114... Step part, 115 .. rivet hole, 12. , 122 ... lower cylinder part, 16 ... inflator housing recess, 17 ... first gas flow path, 18 ... second gas flow path, 19 ... gas flow regulating wall, 20 ..Collision error Lug absorbing collar, 15 ... inflator, 25 ... ridge, 26 ... groove, 201 ... door, 202 ... inner panel, 203 ... door trim, 37 ... joint .

Claims (22)

An inflator that supplies gas into a sealed space formed by an airbag inner and an inflator case, the airbag inner includes a plurality of folded cylinder parts, and is folded by the gas generated from the inflator A first gas flow path for supplying a gas supplied from an inflator to one or a group of cylinder parts, in an airbag device in which each tip part of the plurality of cylinder parts moves in a direction in which it expands and expands so as to absorb shock; A second gas flow path to be supplied to another or another group of cylinders, and the gas pressure supplied from the inflator allows gas to flow from the first gas flow path to the second gas flow path The air bag device is provided with a gas flow restriction wall that prevents gas from flowing from the first gas flow path to the second gas flow path. .
An airbag inner, an outer cover attached to the airbag inner, an inflator case to which the airbag inner is attached, and an inflator for supplying gas into a sealed space formed by the airbag inner and the inflator case The airbag inner includes a plurality of folded cylinder parts, and further includes a first gas flow path for supplying gas supplied from the inflator to one or a group of cylinder parts, and another or another group. A second gas flow path to be supplied to the cylinder portion of the first gas flow path until the gas flow from the first gas flow path to the second gas flow path is enabled by the gas pressure supplied from the inflator. A gas flow restricting wall that prevents inflow of gas from one gas flow path to the second gas flow path; Attached to Utakaba, an airbag device wherein the direction in which the plurality of cylinders of the folded by the gas generated from the inflator is shock-absorbable deployed extended outer cover is thus being moved.
The airbag apparatus of Claim 1 or Claim 2 which accommodated the inflator which supplies gas in the said sealed space and expands and expands these cylinder parts inside the said sealed space.
The one or a group of cylinders is an upper cylinder part disposed above, and the other or another group of cylinders is a lower cylinder part disposed below, and the expansion operation of the upper cylinder part is performed by the lower cylinder. The airbag device according to claim 1 or 2, wherein the airbag device is preceded by a deployment operation of the portion. The airbag apparatus as described in.
Each inflator case includes a plurality of airbag inners, a plurality of inflator case pieces corresponding to the plurality of airbag inners, and an inflator case formed integrally with each of the plurality of inflator case pieces. airbag inner is mounted corresponding to the strip portion, claims the inflator case central airbag inner been wearing metallic inflator plate, the sealed space by the inflator case and inflator plate is formed 1 or claim 2 The airbag apparatus as described in.
6. The airbag device according to claim 5, wherein the plurality of airbag inners are a pair of airbag inners, and the inflator case has a pair of inflator case pieces corresponding to the pair of airbag inners.
The airbag device according to claim 5, wherein the airbag device is attached to an inflator mounting recess formed at a center portion of the inflator case so that one end portion of the inflator protrudes outside the sealed space.
It has almost the same planar shape as the outer shape of the airbag inner, has an insertion hole for inserting the cylinder part of the airbag inner, and is fastened so as to sandwich the airbag inner between the corresponding inflator case pieces. The airbag apparatus as described in any one of Claims 5-7 with which the metal ring which attaches is mounted | worn.
A gas flow path communicating with a plurality of cylinder parts is formed in the inflator case piece, and a gas flow path formed in the central part of the inflator case communicates with a gas flow path formed in the inflator case piece. The airbag apparatus as described in any one of Claims 5-8.
The gas flow path communicating with a plurality of cylinder parts is a first gas flow path communicating with one or a group of cylinder parts and a second gas flow path communicating with another or another group of cylinder parts. 9. The airbag device according to 9.
The airbag device according to any one of claims 1 to 10, wherein a flow path cross-sectional area of the first gas flow path is larger than a flow path cross-sectional area of the second gas flow path.
The airbag apparatus as described in any one of Claims 1-11 in which the orifice plate which provided the orifice between the inflator case and the airbag inner is arrange | positioned.
The airbag device according to any one of claims 2 to 12, wherein a tip of the cylinder portion is fixed to the outer cover with a plastic pin.
The airbag device according to claim 13, wherein the plastic pin has a fall-preventing wall in which the diameter is integrally expanded outward from the base end portion.
The airbag device according to any one of claims 2 to 14, wherein the outer cover has a laminated structure including a plastic panel fixed to a surface and / or a metal plate fixed to a back surface.
The airbag apparatus as described in any one of Claims 1-15 which formed the seal structure in the coupling | bonding area | region of an airbag inner and an inflator case.
The airbag device according to any one of claims 1 to 16, wherein the airbag inner and / or the cylinder portion is made of plastic, elastomer (TPO), or rubber.
The airbag device according to any one of claims 1 to 16, wherein the plurality of cylinder parts are made of an impact-absorbing plastic that exhibits an elongation of 20% to 50% or more in an environment of -30 ° C.
The airbag apparatus as described in any one of Claims 1-18 by which a some cylinder part is integrally molded with an airbag inner by injection molding.
The airbag device according to any one of claims 1 to 18, wherein each of the plurality of cylinder portions is formed by blow molding.
The outer cover of the airbag device according to any one of claims 2 to 20 is arranged on an instrument panel of an automobile body and heads to a position preset as a knee position of an occupant seated on a seat in the automobile compartment. An occupant leg protection device for a vehicle, characterized in that the direction is set as a direction in which a plurality of cylinder parts expand and expand so as to absorb shock.
21. A vehicle side collision, wherein the airbag device according to any one of claims 2 to 20 is disposed between a door of a vehicle body and a door trim, and an outer cover of the airbag device is disposed in the vicinity of the door trim. Crew protection device.

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