JP2009107579A - Airbag and airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knee airbag device capable of protecting an occupant's lower limbs by deploying an airbag with a favorable characteristic. <P>SOLUTION: An airbag 1 is inflated and deployed opposing an occupant's lower limbs from a case body 21 of an airbag device 2 provided on a panel 5 of a cabin 4. The airbag 1 has a swelling part which is demarcated into a plurality of air chambers. An opposing air chamber 46 on the fore end side opposing knee caps A1 is projected largely to the occupant side from other general air chambers 44, 45, and the thickness dimension is largely deployed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an airbag that inflates and deploys, for example, facing an occupant's knee seated in an automobile seat, and an airbag device including the airbag.

  2. Description of the Related Art Conventionally, a so-called knee airbag device, which is a knee protection airbag device that deploys an airbag facing an occupant's knee or the like seated on an automobile seat, is known. This knee airbag device is disposed, for example, below the steering wheel in front of the driver's seat or below the glove box in front of the passenger seat on the instrument panel, and a bag-like airbag is placed inside the case body. Folded small and stored. When the control device detects an impact such as a frontal collision of the vehicle, gas is supplied to the airbag from the inflator so that the airbag protrudes from the case body, and further between the instrument panel and the occupant's knee. Inflated and deployed to protect the occupant.

In such an airbag device, a duct member having three outlets is provided inside a bag-shaped outer shell, and gas is preferentially guided to the front end side of the airbag. There is known a configuration in which an air bag is smoothly deployed even in a narrow space between them (see, for example, Patent Document 1).
JP 2005-96625 A

  The airbag of the conventional knee airbag device has a flat bag shape in which the thickness dimension is substantially constant in each part. On the other hand, with respect to the airbag of the knee airbag device, a large force is applied to the kneecap portion to which the load on the waist is applied. Therefore, even if gas is supplied preferentially to the distal end side of the airbag, considering the gas that blows back to the proximal end side, in order to set a sufficient shock absorbing stroke for the portion of the kneecap to which the load on the waist is concerned Therefore, it is necessary to increase the overall shape of the airbag. Accordingly, the outer shape and capacity of the airbag are increased, and in order to increase the internal pressure of the increased airbag to a required value, it is necessary to use an inflator having a large gas generation amount and gas generation speed. However, it is necessary to increase the size, which increases manufacturing costs. In addition, when the kneecap comes into contact with the airbag, the airbag is compressed, causing depression, deformation, etc., and the gas moves to other parts within the airbag, and the thickness dimension of the portion that contacts the kneecap decreases. To do. Here, in order to prevent the so-called bottoming in which the thickness dimension of the airbag disappears, a predetermined high internal pressure is required. And if the internal pressure is set high assuming a large mass (mass) such as adult males, the reaction force tends to increase for small masses such as small occupants and women, and ideal restraint characteristics can be realized. It's not easy.

  The present invention has been made in view of such a point, and an object thereof is to provide an airbag and an airbag apparatus that are inflated and deployed with favorable characteristics facing a lower limb including a kneecap of a seated occupant.

  The airbag according to claim 1 is an airbag that is inflated and deployed along a predetermined surface facing a lower limb including a kneecap of a seated occupant, and is seated continuously on a base to which a gas is supplied and the base. A bulging portion that faces the lower limbs of the occupant and inflates and expands along the predetermined surface, and the bulging portion is partitioned into a plurality of air chambers that communicate sequentially from the base portion. The air chamber is provided with an opposing air chamber that is inflated and deployed to face the kneecap of the lower limb and has a thickness dimension larger than that of the general air chamber so as to be inflatable and deployable.

  In this configuration, when gas is supplied to the base of the airbag, the inflated portion inflates and deploys against the seated occupant's lower limb, restrains the moving occupant, The contact with the member is suppressed and the occupant is protected. The bulging portion is partitioned into a plurality of air chambers, and the opposing air chamber that inflates and deploys facing the kneecap of the lower limbs is formed so that the thickness dimension is larger than other general air chambers and can be inflated and deployed. In the kneecap portion where the mass of the waist of the occupant is applied, a desirable thickness characteristic is ensured, and a preferable characteristic for easily restraining the occupant and suppressing bottoming is easily realized. As for other general air chambers, since the thickness dimension was reduced, it can be quickly inflated and deployed in a narrow space along a predetermined surface, and the volume of the airbag can be reduced to reduce the amount of gas required for deployment of the airbag. The airbag can be quickly inflated and deployed, and the manufacturing cost can be easily reduced.

  The airbag according to claim 2 is the airbag according to claim 1, wherein the bulging portion has a substantially planar shape on the side facing the predetermined surface, and the facing air chamber is a general air chamber on the side facing the occupant. It bulges more toward the passenger.

  In this configuration, since the bulging portion has a substantially flat shape on the side facing the predetermined surface, the airbag is inflated and deployed smoothly along the predetermined surface. Since the facing air chamber that inflates and deploys facing the kneecap of the lower limb is bulged to the occupant side from the other general air chambers, the occupant can be restrained quickly.

  According to a third aspect of the present invention, there is provided the airbag according to the first or second aspect, further comprising first to third panel portions that constitute an outer shell of the airbag that is joined to each other to form a bag shape. The panel portion includes a predetermined surface facing surface portion facing the predetermined surface, and a patella facing surface portion that is folded back from a distal end portion of the predetermined surface facing surface portion and faces the kneecap of the lower limb portion, and the second panel portion includes a lower limb portion. The third panel portion includes a connecting surface portion that connects the kneecap facing surface portion and the lower limb facing surface portion.

  And in this structure, the opposing air chamber which expand | swells and expands facing the kneecap of a leg part, and whose thickness dimension is larger than another air chamber is easily formed in the front-end | tip part of a bulging part.

  According to a fourth aspect of the present invention, there is provided an airbag device according to any one of the first to third aspects, an inflator that supplies gas to a base portion of the airbag, and a lower part of a panel that constitutes a predetermined surface. And a case body that folds and stores the airbag.

  In this configuration, since the airbag according to any one of claims 1 to 3 is provided, the lower limb portion of the occupant seated in the airbag is supplied by supplying gas from the inflator to the airbag folded and stored in the case body. Inflate and deploy quickly to protect the occupant. The airbag is inflated and deployed with a sufficient thickness at the kneecap portion, and a desirable characteristic for protecting the lower limbs of the occupant is realized. The inflator can be downsized, and the manufacturing cost is reduced.

  According to the present invention, the air bag can be quickly deployed in a narrow space along a predetermined surface, and the air bag has a sufficient thickness dimension at the portion of the kneecap where the mass of the occupant's waist is applied, so that the seated occupant's The preferable characteristic as an airbag which protects a leg part can be easily realized. Since the capacity of the airbag is reduced and the amount of gas necessary for deployment of the airbag is reduced, the airbag can be rapidly inflated and deployed, and the manufacturing cost can be easily reduced.

  Hereinafter, an embodiment of an airbag and an airbag device of the present invention will be described with reference to the drawings.

  In FIG. 1 to FIG. 5, reference numeral 1 denotes an airbag, and an airbag device 2 having the airbag 1 is a predetermined surface facing a vehicle compartment 4 as an interior of a vehicle body of a car as a vehicle to be attached. Is arranged on the panel 5 constituting the. The airbag apparatus 2 is also called a knee airbag apparatus, that is, a knee protection airbag apparatus. When the airbag apparatus 2 receives an impact such as a frontal collision, as shown in FIGS. It is deployed to face the lower limb A including the kneecap A1, and the lower limb A including the occupant's kneecap A1 is restrained to protect the occupant. Hereinafter, directions such as the front-rear direction are based on the straight direction of the vehicle body, that is, as shown in FIG. 1, the front of the vehicle (in the direction of arrow F) is the base end side of the airbag 1 and the rear of the vehicle ( The arrow B direction) is the front end side of the airbag 1, that is, the occupant side. Furthermore, the width direction which is the left-right direction of the vehicle is the width direction (arrow W direction shown in FIG. 4) which is the both-side direction of the airbag 1, that is, the left-right direction. In FIGS. 1 and 2, D is a dummy simulating an occupant.

  The vehicle body includes a pair of seats S on both sides in which passengers can sit in the passenger compartment 4, and a windshield and an instrument panel 12 are disposed in front of the seats S. Further, a panel 5 called a dash panel or the like constituting the instrument panel 12 is arranged at a lower part or a middle part below the instrument panel 12, and the airbag is opposed to each seat S on the panel 5. A device 2 is attached. One seat S is a driver's seat, and a steering wheel 13 is disposed between the instrument panel 12 and the panel 5. The other seat S (not shown) is a passenger seat, and a glove box or the like is disposed between the instrument panel 12 and the panel 5. In addition to the airbag device 2 described above, the passenger compartment 4 is provided with an airbag device (not shown) on the steering wheel, the instrument panel 12, the side of the seat S, the roof side rail, and the like.

  The airbag device 2 includes a case body 21 that is a container portion, an inflator 22 that is attached to the case body 21, a retainer 24, the airbag 1, and a cover body (not shown). The case body 21 is also referred to as a housing or the like, and includes a case main body portion 21b having a substantially box shape with the rear surface being an opening 21a. The inside of the case main body portion 21b serves as an airbag storage portion 28. Yes. The opening 21a has a rectangular shape whose longitudinal direction is on both sides, and is slightly inclined downward. The case body 21b is provided with an attachment piece for locking the cover body, and a bracket is attached, and the bracket is fixed to an attachment member of the vehicle body.

  Further, as shown in FIG. 4, the inflator 22 includes an inflator main body 22a having a substantially cylindrical shape, and a gas injection part 22b is provided in the vicinity of one end of the inflator main body 22a, and at the other end. A connection is provided. The inflator 22 is connected to the control device via a harness (not shown) connected to the connection portion, and injects gas from the gas injection portion 22b based on an activation signal supplied from the control device via the harness. . The retainer 24 includes a metal retainer main body 24a having a substantially cylindrical shape and a pair of mounting bolts 24b fixed to the retainer main body 24a by welding or the like. The retainer 24 is attached to the case body 21 by a nut that performs.

  Further, the cover body (not shown) is also called a lid or the like, and for example, a front plate portion and a mounting plate portion are integrally formed of synthetic resin. The front plate portion covers the opening 21a of the case body 21, and a tear line that is a fragile fracture portion is formed in a substantially H-shape or the like. Further, the mounting plate portion protrudes in a rectangular tube shape or the like from the back surface side of the front plate portion, that is, from the front surface side to the front side, and is fitted to the case main body portion 21b and locked to the mounting piece portion.

  The airbag 1 is formed into a bag shape by stitching together one base fabric or stitching a plurality of base fabrics, folded into a predetermined shape, and stored in the airbag storage portion 28 of the case body 21. . In the present embodiment, the airbag 1 is configured by stitching together a plurality of base fabrics. That is, the airbag main body 30 that forms the bag-shaped outer shell has three base fabrics, that is, first to first fabrics. A first partition wall 35 and a second partition wall 36 as partition walls are arranged inside the airbag main body 30 and are formed by third panel portions 31, 32, 33. Reinforcement cloths 37 and 38 are arranged.

  And the 1st panel part 31 of the airbag main-body part 30 folds back one base fabric in the upper end part along the width direction W, ie, the fold line of the front-end | tip part 31a, this predetermined surface opposing surface part 31b, and this predetermined | prescribed surface part A knee-head-facing surface portion 31c that is continuous with the distal end side of the surface-facing surface portion 31b and overlaps the predetermined surface-facing surface portion 31b is formed. In addition, the second panel portion 32 includes a lower limb portion facing surface portion 32a that is overlapped with the predetermined surface facing surface portion 31b and that has substantially the same shape as a portion of the predetermined surface facing surface portion 31b that is not overlapped with the kneecap facing surface portion 31c. Yes. Further, the third panel portion 33 is a belt-like base fabric, and the front end of the patella facing surface portion 31 c of the first panel portion 31, that is, the rear edge portion, and the lower limb facing surface portion of the second panel portion 32. A connecting surface portion 33a is provided to connect the tip of 32a, that is, the front edge portion.

  Therefore, as shown in FIGS. 1 and 5, the airbag main body portion 30 includes a first head portion 31 c of the first panel portion 31 and a first edge portion of the connecting surface portion 33 a of the third panel portion 33. 4 is sewn at the second suture line L1, and the lower edge portion facing surface portion 32a of the second panel portion 32 and the other edge portion of the connecting surface portion 33a of the third panel portion 33 are stitched together at the second suture line L2 and shown in FIG. As described above, both side portions of the panel portions 31, 32 and 33 are sewn together by third suture lines L3 and L3 which are side suture lines, and opened to the proximal end portion 31d side on the front end side opposite to the distal end portion 31a. And a bag shape is formed with the vicinity of the base end portion 31d folded upward. Further, the airbag main body 30 is configured such that the width dimension is the smallest on the base end part 31d side and the width dimension increases toward the distal end part 31a. That is, the airbag main body 30 includes a base end portion 31d, and a base portion 41 that can be stored in the airbag storage portion 28 without being folded in both directions is formed in the vicinity of the base end portion 31d. A bulging portion 42 is formed on the distal end side, which is wider than the airbag storage portion 28, that is, the opening 21a, and can be stored in the airbag storage portion 28 by being folded in both directions.

  In addition, the airbag body 30 has a substantially planar shape on the side facing the panel 5 by a predetermined surface facing surface portion 31b, while the side facing the occupant has a connecting surface portion 33a of the third panel portion 33. The thickness of the kneecap facing surface portion 31c is larger than that of the lower leg facing surface portion 32a, that is, the kneecap facing surface portion 31c can protrude toward the occupant side than the lower leg facing surface portion 32a. It has become.

  Further, the first partition wall 35 and the second partition wall 36 are also called baffles, and are constituted by strip-shaped base cloths having the same shape. The first partition wall 35 and the second partition wall 36 are formed on the inner side of the bulging portion 42 from the proximal end portion 31d side to the distal end portion 31a. The first partition wall 35 to the second partition wall 36 are arranged in parallel with each other. The first partition 35 and the second partition 36 divide the bulging portion 42 into a plurality of air chambers (chambers). In the present embodiment, the first general air chamber directly communicating with the base 41 is used. 44, the first general air chamber 44 is divided into three air chambers, a second general air chamber 45 located at the tip 31a of the first general air chamber 44, and an opposing air chamber 46. And the 1st partition 35 and the 2nd partition 36 have the length dimension which divides the full length of the width direction W of the bulging part 42 of the airbag main-body part 30, and both side edges along a longitudinal direction are defined. The predetermined facing surface portion 31b of the first panel portion 31 of the airbag main body 30 and the lower limb facing surface portion 32a of the second panel portion 32 at the fourth stitching lines L4 and L4 and the fifth stitching lines L5 and L5, respectively. The two end portions in the longitudinal direction are joined together by stitching together in a substantially airtight manner with the third suture lines L3 and L3.

  The second partition wall 36 is disposed along the distal end portion of the lower limb facing surface portion 32a of the second panel portion 32, and the fifth suture line L5 on the lower limb facing surface portion 32a side is the second suture line. It is formed integrally with or overlaid with L2. That is, the opposed air chamber 46 defined on the distal end side of the second partition wall 36 can also be called a knee protection chamber, and can be swelled with a larger thickness than the other general air chambers 44 and 45. ing.

  The first partition wall 35 and the second partition wall 36 are each formed with a flow portion 48 that is a vent hole through which gas can flow at predetermined intervals. Each circulation part 48 is formed in a circular hole shape having a predetermined diameter, for example. That is, for the three air chambers 44, 45, 46 defined by the partition walls 35, 36, the air chambers adjacent to each other are partitioned by the partition walls 35, 36 over the entire width in both sides, that is, in the width direction W. Only the portion 48 is configured to communicate with a predetermined ventilation resistance.

  The base 41 communicating with the base end portion 31d of the first general air chamber 44 is provided with a gas introduction portion in which the inflator 22 is disposed, and the airbag main body 30 is configured in this gas introduction portion. Reinforcing cloths 37 and 38 are arranged on the inner surface of the base cloth. These reinforcing cloths 37 and 38 are also called flameproof cloths, and are formed by stacking one or more base cloths, and one reinforcing cloth 37 is placed on the inner surface of the first panel portion 31. And is attached by stitching with a sixth suture line L6 extending in both directions. The other reinforcing cloth 38 is arranged so as to overlap with the inner surface of the second panel portion 32, and is attached by sewing with a seventh sewing line L7 extending in both directions.

  In addition, the gas introduction portion of the airbag 1 has circular mounting holes 54 and 55 penetrating the first panel portion 31, the second panel portion 32, and the reinforcing cloths 37 and 38. A plurality are formed. The mounting hole 54 on the side separated from the base end portion 31d is formed only on the first panel portion 31 side, and the mounting hole 55 on the base end portion 31d side is formed between the first panel portion 31 and the second panel. It is formed through the portion 32.

  Next, the assembly process of this airbag apparatus 2 is demonstrated.

  First, an assembly is configured by combining the airbag 1, the inflator 22, the retainer 24, and the like. In this step, first, the inflator 22 is inserted and fixed inside the retainer body 24a of the retainer 24. Then, the retainer 24 to which the inflator 22 is attached is inserted into the gas introduction portion of the base portion 41 inside the airbag 1 from the opening of the base end portion 31d, and the mounting bolt 24b of the retainer 24 is pulled out from one mounting hole 54. Then, the vicinity of the base end portion 31d of the airbag 1 is folded back, and the mounting bolt 24b of the retainer 24 is passed through the other mounting hole 55. Next, the airbag 1 is folded into a small shape by a roll shape, a bellows shape, or a combination of these, and wrapped as necessary to hold the folded shape to form an assembly.

  Next, this assembly is inserted into the case body 21 through the opening 21a, the mounting bolt 24b of the retainer 24 is passed through the mounting hole provided in the bottom of the case body 21, and the mounting bolt 24b from the outside of the case body 21 The assembly, that is, the airbag 1, the inflator 22, the retainer 24, and the like are fixed to the case body 21 by screwing the nuts onto the case body 21. Next, the airbag device 2 is configured by attaching a cover body to the case body 21 and covering the opening 21a, that is, the airbag 1.

  Then, the bracket of the case body 21 is fixed to the mounting member of the vehicle body using a fixture such as a bolt and a nut, and the airbag device 2 is mounted on the vehicle body so that the front plate portion of the cover body is flush with the panel 5. The airbag device 2 is installed on the vehicle body by attaching and electrically connecting the harness connected to the inflator 22 to the control means.

  Next, a deployment operation of the airbag device 2 will be described.

  When the control device detects an impact such as a frontal collision of an automobile, the control device supplies electric power as an activation signal through the harness and activates the inflator 22. When gas is supplied from the inflator 22 into the airbag 1, the airbag 1 inflates inside the case body 21, first ruptures the wrapping, and then breaks the cover body at the tear line, The bag 1 is inflated from the case body 21 to the vehicle compartment 4 and further inflated and expanded upward along the panel 5. More specifically, first, the gas supplied from the inflator 22 is supplied to the gas supply portion of the base portion 41 of the airbag 1 while being diffused by the retainer body 24a of the retainer 24. Then, gas is supplied as shown by an arrow in FIG. 1, and first, the base portion 41 of the airbag 1 and the first general air chamber 44 directly communicating with the base portion 41 start to expand and deploy. Next, when the first general air chamber 44 expands to some extent, gas is supplied to the second general air chamber 45 via the flow part 48 of the first partition wall 35 and expands and expands upward. When the general air chamber 45 expands to some extent, the opposing air chamber 46 expands and expands upward via the flow part 48 of the second partition wall 36.

  As shown in FIGS. 1 and 2, when the airbag 1 is inflated and deployed, the bulging portion 42 is inflated and deployed along the lower limb portion A of the occupant to prevent the occupant from slipping downward and protect it. In particular, the opposed air chamber 46, which has a large projecting dimension toward the occupant side and expands greatly in thickness, is inflated and deployed facing the portion of the kneecap A1, and the other general air chambers 44, 45 are in the kneecap A1. The lower leg part A is further inflated and deployed opposite to the lower leg part A.

  As described above, according to the present embodiment, the airbag 1 is deployed along the elevation surface of the panel 5 to protect the lower limb portion A including the kneecap A1 of the seated occupant. As for the airbag device 2 that is a so-called knee airbag device, the inflated portion 42 of the airbag 1 is inflated and deployed against the lower limb portion A of the seated occupant to restrain the moving occupant and the panel 5 For example, it is possible to suppress contact with a member on the vehicle body side and protect the occupant.

  The bulging portion 42 is partitioned into a plurality of air chambers 44, 45, 46, and the opposite air chamber 46 that expands and deploys facing the kneecap A1 of the lower limb A is replaced with another general air chamber 44, 45. Since the thickness of the kneecap A1 is larger than that of the kneecap A1 where the mass of the occupant's lumbar area is large, a sufficient thickness dimension, that is, a sufficient protective stroke, is secured, and the occupant is securely restrained and bottomed. The preferable characteristic which suppresses and protects effectively can be implement | achieved easily. That is, the opposed air chamber 46 is inflated and deployed to oppose the kneecap A1 on the axis of the occupant's waist that moves forward due to inertia, restrains and protects the occupant's kneecap A1, and consequently the occupant's kneecap A1. By suppressing the movement of the waist, it is possible to effectively suppress the relative movement of the occupant with respect to the vehicle body, and to suppress and protect against direct contact with the floor surface entering the panel 5 or the passenger compartment 4.

  Further, the other general air chambers 44 and 45 are expanded in a plate shape so as to have a small thickness dimension, so that they rapidly expand and expand with a small amount of gas and rapidly expand into a narrow flat space along the panel 5. Can be deployed. In addition, the overall capacity of the airbag 1 can be reduced, the amount of gas required to deploy the airbag 1 can be reduced, and the entire airbag 1 can be rapidly inflated and deployed. The manufacturing cost can be reduced and the airbag device 2 can be easily downsized.

  Further, since the bulging portion 42 is formed in a substantially flat shape by forming the side facing the panel 5 with the first panel portion 31 of one sheet, the airbag 1 can smoothly move without interfering with the panel 5. Can be inflated and deployed. On the other hand, the side facing the occupant of the bulging portion 42 swells the facing air chamber 46 facing the kneecap A1 of the lower limb A from the other general air chambers 44, 45 to the occupant side. 46 can quickly contact the occupant, restrain the occupant quickly, and can be protected stably.

  In addition, the airbag 1 is configured to form an outer shell by combining the first to third panel portions 31, 32, 33, and is opposed to the kneecap by folding the tip portion 31a of the predetermined surface facing surface portion 31b of the first panel portion 31. The surface portion 31c and the distal end side of the lower limb portion facing surface portion 32a of the second panel portion 32 are connected by a third panel portion 33, so that a third panel portion 33 having substantially the same shape is connected to the second partition wall 36. Since it is configured in a shape arranged in series, the opposed air chamber 46 that expands larger in thickness than the other general air chambers 44 and 45 at the distal end portion of the bulging portion 42 is opposed to the kneecap A1 of the lower limb A. Can be formed.

  In this manner, the airbag 1 is quickly and stably inflated and deployed from the airbag accommodating portion 28 in a narrow space provided at a low position, and protects the lower limb portion A of the occupant seated on the seat S of the vehicle, In particular, it is possible to provide the airbag device 2 having a preferable characteristic that it has sufficient protection performance with respect to the knees, and can prevent the so-called submarine phenomenon from slipping downward.

  In the above embodiment, the third panel portion 33 that secures the thickness dimension of the facing air chamber 46 is arranged in series with the second partition wall 36 so as to align the position with the second partition wall 36. The second suture line L2 and the fifth suture line L5 are formed integrally or overlapped, but the present invention is not limited to this configuration. For example, as shown in FIG. 6, the third panel portion 33 is sewn to a position shifted from the distal end side of the second panel portion 32. For example, the position of the second suture line L2 is set to the first partition wall. It is also possible to sew together in accordance with the position of 35 fourth suture line L4.

  Further, the number of the partition walls 35, 36, that is, the number of the general air chambers 44, 45 can be set as appropriate.

  Furthermore, the stitched portion can be joined by other means such as adhesion.

  The present invention can protect an occupant by providing a moving body other than a vehicle in addition to an airbag device provided in a vehicle.

It is explanatory drawing which expanded a part of FIG. 2 at the time of expansion | deployment of the airbag which shows one Embodiment of the airbag apparatus of this invention. It is explanatory drawing at the time of expansion | deployment of the airbag of an airbag apparatus same as the above. It is the perspective view which notched a part of airbag same as the above. It is explanatory drawing of the state expanded to the planar shape of an airbag and an inflator same as the above. It is explanatory drawing of the II cross section equivalent position of FIG. 4 of an airbag same as the above. It is explanatory drawing of the II equivalent cross section of FIG. 4 which shows other embodiment of the airbag of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air bag 2 Air bag apparatus 5 Panel which comprises a predetermined surface
21 Case body
22 Inflator
31 First panel
31a Tip
31b Predetermined surface facing surface
31c Knee head facing surface
32 Second panel section
32a Lower limb facing surface
33 Third panel
33a Connecting surface
41 Base
42 bulge
44, 45 General air chamber
46 Opposite air chamber A Lower limb A1 Kneecap

Claims (4)

An airbag that inflates and deploys along a predetermined surface facing a lower limb including a kneecap of a seated occupant,
A base to which gas is supplied;
A bulging portion that is inflated and deployed along the predetermined surface facing the lower limb of an occupant seated continuously on the base,
The bulging portion is partitioned into a plurality of air chambers that are sequentially communicated from the base, and these air chambers are inflated and deployed to face the general air chamber and the kneecap of the lower limb, and have a thickness dimension greater than that of the general air chamber. An air bag characterized by comprising an opposing air chamber formed so as to be large inflatable and deployable. 2. The air according to claim 1, wherein the bulging portion has a substantially planar shape on a side facing a predetermined surface, and an air chamber facing the occupant bulges from the general air chamber to the occupant side. bag. Comprising first to third panel portions that constitute the outer shell of an airbag that is joined together to form a bag,
The first panel portion includes a predetermined surface facing surface portion that faces a predetermined surface, and a kneecap facing surface portion that is folded back from a tip portion of the predetermined surface facing surface portion and faces the kneecap of the lower limb,
The second panel portion includes a lower limb facing surface portion facing the lower limb,
The airbag according to claim 1 or 2, wherein the third panel portion includes a connecting surface portion that connects the kneecap facing surface portion and the lower limb facing surface portion. An airbag according to any one of claims 1 to 3;
An inflator for supplying gas to the base of the airbag;
An airbag device comprising: a case body that is positioned at a lower portion of a panel that constitutes a predetermined surface and stores the airbag in a folded manner.

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