JP2006205934A - Air bag and non-occupant protection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably deploy an air bag 21 for protecting a pedestrian along an A pillar 14 of a vehicle body 1. <P>SOLUTION: The folded air bag 21 is stored below a rear end of a hood 3. A body part 32 of the air bag 21 is provided with a first gas chamber 41; and a second gas chamber 42 projected from the first gas chamber 41. A strap 50 is arranged between a second position B at an intermediate position of a lower surface of the second gas chamber 42 and a first position A of the first gas chamber 41. Length dimension of the strap 50 is set shorter than length dimension of a base cloth 30 of the body part 32. The strap 50 is folded and stored with the body part 32. When the vehicle body 1 and the pedestrian collide, an inflator 22 is activated and the first gas chamber 41 pushes up a rear end of the hood 3. The second gas chamber 42 is deployed along the A pillar 14 and covers the A pillar 14. After the strap 50 is deployed with the body part 32, it pulls downward the intermediate position of the second gas chamber 42 and stably deploys the second gas chamber 42. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a non-occupant protection airbag and a non-occupant protection device that protects a colliding non-occupant when a collision between a non-occupant such as a pedestrian and a vehicle is unavoidable.

2. Description of the Related Art Conventionally, there has been known a pedestrian protection device provided with a so-called pedestrian protection airbag that reduces a shock to a pedestrian when a collision between a vehicle and a pedestrian is unavoidable. About such a pedestrian protection apparatus, when a collision is detected, the structure which expand | deploys an elongate airbag in a rod shape along the pillar part of the both sides of a windshield is known (for example, refer patent document 1). . And in this structure, the strap shorter than the full length of an airbag is spanned from the upper end of an airbag to a lower end, and it curves so that an airbag may approach the windshield side at the time of expansion | deployment of an airbag. The strap is folded separately from the airbag, and is disposed adjacent to the folded airbag.
JP 2003-306099 A (2nd page, FIG. 1-3)

  The conventional configuration has a problem that the manufacturing process is complicated because the strap is folded and stored separately from the airbag. Further, when the airbag is deployed, the airbag and the strap are deployed in separate paths. It is not always easy to stably deploy the airbag. Also, for such a pedestrian protection device, a configuration is known in which an air chamber for lifting the rear end of the hood is provided on the airbag, and an air chamber covering the pillar is protruded from the air chamber for lifting the rear end of the hood. However, in such a configuration, the air chamber that covers the pillar is likely to swing during deployment due to a change in the pressure of the air chamber that lifts the rear end of the hood. It is not always easy to develop stably. Furthermore, in the configuration in which the airbag that covers the pillar and the airbag that lifts the rear end of the hood are separately provided, it is not easy to dispose the plurality of airbags so that they do not interfere with each other.

  This invention is made | formed in view of such a point, and it aims at providing the airbag and non-occupant protection apparatus which can deploy an airbag stably.

  The airbag according to claim 1 includes a hood provided at a front portion of the vehicle, a windshield positioned behind the hood, and pillar portions that support both side portions of the windshield. An air bag that is folded and stored in a storage unit below the rear part and is supplied with gas and deployed, and is supplied with gas and deployed, and presses the hood to move the first air chamber; A second air chamber that communicates with the first air chamber, is supplied with gas, expands, covers at least a part of the pillar portion, a first position on the first air chamber side, and the second air chamber. And a strap that is folded and housed together with the first air chamber and the second air chamber in a state of being connected to the second position at the intermediate position on the lower surface of the air chamber.

  And in this structure, when a non-occupant collides with a vehicle, gas will be supplied to the 1st air chamber of an airbag, this 1st air chamber will expand | deploy, and a hood will be pushed and moved upwards. Next, gas is supplied from the first air chamber to the second air chamber, and the second air chamber expands to cover at least a part of the pillar portion. When a non-occupant who has collided with the front of the vehicle and collided with the hood further collides with the hood, a space required for the deformation of the hood is secured, and the shock absorption characteristics are improved. In addition, at least a part of the pillar portion is covered with the airbag, and the impact when the non-occupant collides with the pillar portion is reduced. And since the strap which connects the intermediate | middle position of the lower surface of a 2nd air chamber to the 1st air chamber side was provided, an airbag is expand | deployed stably and a non-occupant is effectively protected. Furthermore, since the strap is folded and stored together with the first air chamber and the second air chamber of the airbag, the manufacturing process is not complicated and the manufacturing cost can be easily reduced. In addition, a part of the lower surface of the first air chamber and the second air chamber is covered with the strap, so that the first position and the second air chamber are protected from the vehicle structure.

  The airbag according to claim 2 is the airbag according to claim 1, wherein the length dimension of the strap between the first position and the second position is the first position and the second position. It is shorter than the length dimension of the said base fabric in the state which spread | deployed the base fabric which comprises the airbag of between on the plane.

  In this configuration, when the airbag is deployed, the intermediate position of the second air chamber is pulled downward, and the airbag is stably deployed.

  The airbag according to claim 3 is the airbag according to claim 1 or 2, wherein the strap is formed of a base fabric and is sewed and connected to the second air chamber. It is engaged with the holding means for holding and connected to the first air chamber side.

  And in this structure, since the strap was comprised with the base fabric, the strap is easily folded together with the first air chamber and the second air chamber. One end of the strap is sewn at the second position of the airbag in advance, and the other end only needs to be locked to a holding means for holding the airbag in the storage portion, which simplifies the manufacturing process and reduces manufacturing costs. Is done.

  The airbag according to claim 4 is the airbag according to any one of claims 1 to 3, wherein the second air chamber projects from the first air chamber in a predetermined direction, and the strap is The second air chamber is disposed so as to be inclined from the second position of the second air chamber toward the center side of the first air chamber from a direction along the predetermined direction.

  In this configuration, since the intermediate position of the second air chamber is pulled toward the center of the first air chamber by the strap when the air bag is deployed, the air bag is stably deployed.

  The airbag according to claim 5 is the airbag according to any one of claims 1 to 4, wherein the lower surface of the strap is formed to have a higher frictional resistance than the lower surfaces of the first air chamber and the second air chamber. Is.

  In this configuration, when the lower surface of the strap having a large frictional resistance comes into contact with the vehicle, the airbag is supported and the airbag is stably deployed.

  The non-occupant protection device according to claim 6 includes a deformable hood provided at a front portion of the vehicle, a windshield positioned behind the hood, and pillar portions that support both side portions of the windshield. 6. The airbag according to claim 1, wherein the airbag is folded and stored in a storage section below a rear portion of the hood of the vehicle, an inflator for supplying gas to the airbag, and the airbag at a first position. A holding means for fixing the first air chamber and the strap and holding the airbag in the storage part, a control means for detecting a collision with a non-occupant and operating the inflator, and a rear part of the hood upward And a support portion that is movably supported.

  In this configuration, since the airbag according to any one of claims 1 to 5 is provided, when the non-occupant collides with the vehicle, the hood is moved to a predetermined position and the pillar portion is stably stabilized by the airbag. The non-occupant who covers and collides with the vehicle is effectively protected by the deformation of the hood and the airbag covering the pillar portion. Since the holding means for holding the airbag in the storage portion also serves as means for fixing the strap to the first position, the configuration is simplified and the manufacturing cost is reduced.

  According to the present invention, since the strap for connecting the intermediate position of the lower surface of the second air chamber to the first air chamber side is provided, the airbag can be stably deployed and non-occupants can be effectively protected. Furthermore, since the strap is folded and stored together with the first air chamber and the second air chamber of the airbag, the manufacturing process is not complicated and the manufacturing cost can be easily reduced.

  Hereinafter, an embodiment of an airbag and a non-occupant protection device of the present invention will be described with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes an automobile body, which is a vehicle. The vehicle body 1 includes a hood 3 that covers a front engine room 2, and a windshield that covers a vehicle room 4 located behind the engine room 2. A glass 5 and a cowl top cover 8 covering the cowl portion 7 between the engine room 2 and the vehicle compartment 4 are attached, and the non-occupant protection device is located below the rear end of the hood 3. A pedestrian protection device 10 is provided. Hereinafter, directions such as forward (arrow F direction), upward (arrow U direction), and both side directions (arrow W direction shown in FIG. 2) will be described with reference to the straight traveling direction of the vehicle body 1.

  The hood 3 is also called a bonnet hood or a front hood, and is provided at the front of the vehicle body 1 and formed of one or more metal plates, and constitutes a so-called pedestrian injury reducing body. And when a pedestrian collides, it is easily deformed to absorb the impact. The hood 3 is provided so as to be openable and closable with a support portion which is a hinge mechanism (not shown) provided on both side portions near the rear end portion as a fulcrum, that is, a rotation shaft. In operation, the support portion supports the rear end portion of the hood 3 so as to be raised by a predetermined distance.

  The windshield 5 is supported on both sides by A pillars 14 as pillar portions, and the lower surface near the front end is supported by a cowl top panel 16 via a seal portion 15.

  Further, the cowl portion 7 is also called an air box or the like, and is provided in a bowl shape with an upper opening between the cowl top panel 16 and the vehicle body panel 17 positioned in front of the cowl top panel 16. A cowl top cover 8 is attached to cover. The cowl unit 7 is provided with a motor for driving a wiper and the like, and is connected to an air intake unit of an air conditioner. Further, the cowl top cover 8 is supported by being fitted to the windshield 5 at the rear end portion, and is supported on a support base portion 18 provided on the vehicle body panel 17.

  The pedestrian protection device 10 is a so-called pedestrian protection airbag device, and is a bag-like airbag that is folded and stored in a cowl portion 7 positioned below the rear end portion of the hood 3 on the front side of the vehicle body 1. 21. Then, by supplying gas to the airbag 21 and deploying it, the rear end of the hood 3 is lifted to secure a deformation area below the hood 3, improving the shock absorption characteristics of the hood 3 and deploying. The airbag 21 covers at least a part of the upper surface of the cowl portion 7 and the front surface of the A pillar 14. That is, the pedestrian protection device 10 stores an airbag 21, an inflator 22 that supplies gas to the airbag 21, a retainer 24 as a holding unit that fixes the airbag 21 and the inflator 22, and the members. And a control unit (not shown).

  As shown in FIGS. 1 and 2, the airbag 21 includes a main body portion 32 formed in a bag shape having an outer shell formed by stitching the outer peripheral portions of two base fabrics 30 with an outer peripheral suture line 31. The main body portion 32 as a whole has a base portion 33 extending in both side directions, and a protrusion projecting from a side end portion of the base portion 33 along a predetermined direction C substantially along the direction of the A pillar 14. The portion 34 is substantially U-shaped. Further, inside the outer shell, along the longitudinal direction of the base portion 33, a partition wall portion (baffle) 36 formed by the base fabric is sewn to each base fabric constituting the outer shell by an inner suture line 37. Yes. Further, in the vicinity of both end portions of the partition wall portion 36, a communication portion 38 which is a ventilation portion having a circular hole shape or the like is formed. The partition wall 36 allows the base 33 inside the airbag 21 in the present embodiment to be substantially airtight to the first air chamber 41 and the second air chamber 42 except for the communication portion 38. It is partitioned. In other words, the first air chamber 41 and the second air chamber 42 are formed to communicate with each other only through the communication portion 38.

  The first air chamber 41 is a front air chamber that is at least partially positioned below the hood 3 when deployed. A cowl covering portion communicating therewith. In the first air chamber 41, the inflator 22 and the retainer 24 are accommodated in pairs on both sides. The lower base fabric 30 is formed with two mounting holes 44 as mounting portions for mounting the retainer 24 at a first position A that is paired on both sides. Further, the first air chamber 41 as a whole is formed so that the dimension in the front-rear direction is substantially constant and the both side directions are in the longitudinal direction. It is formed as an inclined surface 45 that expands toward the surface. Furthermore, the inclined surface 45 is formed so as to be smoothly continuous with both side portions of the second air chamber 42 so that the width of the second air chamber 42 is larger than that of the first air chamber 41. . The second air chamber 42 is a rear air chamber located on the rear side of the first air chamber 41, and includes a pillar covering portion 42a configured by each projecting portion 34 and covering the A pillar 14, The upper portion of the base portion 33 includes a cowl covering portion 42b that covers the cowl portion 7.

  Further, one or a plurality of straps 50 in the present embodiment are attached to the airbag 21 so as to overlap a part of the lower surface of the base fabric 30 on the lower side of the main body portion 32. As shown in FIGS. 1 to 4, the strap 50 has a bilaterally symmetric shape with respect to a central axis O in both sides of the body portion 32 of the airbag 21, that is, the center of the first air chamber 41. Is arranged. Each strap 50 is formed in a belt shape using a base fabric similar to the base fabric 30 constituting the main body 32, and a low-slip rubber coating such as silicon is applied to the lower surface that becomes the vehicle body facing surface, It is formed so that the frictional resistance is larger than that of the base fabric 30. Each strap 50 is sewn to the base cloth 30 on the lower surface of the second air chamber 42 at the vicinity of one end portion in the longitudinal direction by a suture line 51 which is an attachment portion at the second position B. Further, the other end portion in the longitudinal direction of each strap 50 is cut at an inclination, and in the vicinity of the other end portion, two attachment portions corresponding to the attachment holes 44 of the main body portion 32 are provided. A mounting hole 52 is formed.

  Here, as shown in FIG. 2, the dimension L2 from the suture line 51 of the strap 50 to the attachment hole 52 is the first position A when the base fabric 30 of the main body 32 of the airbag 21 is spread on a plane. Are smaller than the dimension L1 from the corresponding mounting hole 44 to the suture line 51 at the second position B (L1> L2). Therefore, in the state where the mounting holes 44 and 52 are aligned with each other, the base fabric 30 on the lower side of the main body portion 32 of the airbag 21 is in a state where the wrinkles are excessively generated as shown in FIG.

  In the state where the strap 50 is attached to the main body portion 32 of the airbag 21, the center direction D in the longitudinal direction of the strap 50 is a predetermined direction in which the second air chamber 42 protrudes from the first air chamber 41. It is set so as to be inclined with respect to C by a predetermined angle θ from the suture line 51 at the second position B toward the center of the first air chamber 41.

  Further, a reinforcing cloth called a flameproof cloth or the like is overlapped and sewn on the main body as necessary.

  Each inflator 22 is a gas generator, and includes a substantially cylindrical main body 22a, and a gas injection part 22b is provided on one end side of the main body 22a. The inflator 22 is supplied with an ignition signal to a connector (not shown) to react the propellant filled inside, or to release the gas stored in the internal cylinder, etc. Gas is injected from a plurality of holes provided on the peripheral surface. In this embodiment, the two inflators 22 are arranged so that the gas injection portions 22b face opposite sides.

  The retainer 24 is an inflator fixture including a retainer main body portion 24a formed by bending a metal plate and the like, and a bolt 53 fixed to the retainer main body portion 24a. The retainer main body 24a fixes the inflator 22, and guides the gas injected from the gas injection unit 22b. Further, a nut 54 is screwed onto the bolt 53.

  Further, the case 25 includes a case main body having a groove shape with an upper opening, and the upper opening of the case main body is covered with a lid (not shown). In the present embodiment, the case main body is formed integrally with the cowl top cover 8. On the other hand, the lid is separate from the cowl top cover 8, and a tear line is formed as a breakable breakable portion that is a weak portion along the longitudinal direction.

  Further, the connector of each inflator 22 is connected to a control device (not shown) via a harness. The control device includes a CPU and the like, and includes a plurality of sensors as detection means, detects a collision between the pedestrian and the vehicle body 1, and operates each inflator 22.

  Further, support portions (not shown) are located on both sides of the case 25, that is, on both sides of the airbag 21 that is folded and stored, and connects the vehicle body panel 17 side and the vicinity of the rear end portion of the hood 3. Each support portion, for example, connects one end of the link shafts of two elongated metal plates so as to be rotatable at the shaft portion, and connects the other end of one link shaft to the vehicle body panel 17 side. The other end of the link shaft is connected to the hood 3 side. When the normal hood 3 is opened and closed, the shaft portion of the support portion serves as a rotation shaft, and the front end portion of the hood 3 rotates upward. On the other hand, when the pedestrian protection device 10 is activated and an upward force is applied to the rear end portion of the hood 3, the shaft portion rotates and the other end of each link shaft rotates as a rotation shaft, The rear end portion of the hood 3 is moved upward by a predetermined dimension, for example, about 5 cm, and can be rotated about the front end side as a fulcrum.

  The assembly process of the pedestrian protection device 10 includes the inflator 22 and the first air chamber 41 of the airbag 21 formed by sewing the strap 50 to the main body 32 at the sewing line 51 at the second position B. Insert the assembly combined with the retainer 24, pull out the bolt 53 of the retainer 24 through the mounting hole 44 to the outside of the main body 32 of the airbag 21, and insert the mounting hole 44 of the strap 50 into these bolts 53. Lock. Next, the airbag 21 is folded into a predetermined shape. The folded airbag 21 is inserted into the case body of the case 25, and the bolt 53 is passed through the cowl top cover 8 and the support base 18 of the vehicle body panel 17 so that the bolt 53 extends from the lower side of the support base 18 to the bolt 53. The nut 54 is screwed and tightened. In this state, the retainer 24 fixes the first position A of the airbag 21 and the inflator 22 together with the cowl top cover 8 to the support base 18 of the vehicle body panel 17. Then, the pedestrian protection device 10 is covered as shown in FIG. 1 (a) by covering the upper opening of the case body, attaching the lid, and electrically connecting the inflator 22 and the control device with a harness. Is configured.

  Next, the operation of the pedestrian protection device 10 will be described.

  First, as shown in FIG. 1A, when the control device detects a collision between the front portion of the vehicle body 1 and a pedestrian in a state where the folded airbag 21 is stored in the case 25, the control device Electric power is supplied to activate the inflator 22. Then, this inflator 22 supplies gas from the gas injection part 22b. At this time, the inner side of the airbag 21 is divided into a first air chamber 41 and a second air chamber 42 by a partition wall 36, and the first air chamber 41 and the second air chamber 42 are separated from each other. While communicating with each other only through the communication portion 38 having a large ventilation resistance, and the inflator 22 is disposed in the first air chamber 41, the gas supplied from the inflator 22 is the first in the initial state of deployment. The first air chamber 41 is developed by staying in the first air chamber 41. Then, the rear end portion of the hood 3 is pushed up by a predetermined dimension by the pressure of the development. In this state, a gap is secured between the hood 3 and the member in the engine room 2 by the hood pushing portion of the first air chamber 41, and the cowl portion 7 is formed by the cowl covering portion of the first air chamber 41. Part of it is covered.

  Further, in a state where the first air chamber 41 is sufficiently expanded, gas is supplied from the first air chamber 41 to the second air chamber 42 via the communication portions 38 provided in the vicinity of both end portions in both sides. As shown in FIG. 1B, the pillar covering portion 42a and the cowl covering portion 42b of the second air chamber 42 are developed. The pillar covering portion 42a covers part or all of the A pillar 14, and the cowl covering portion 42b covers the wiper of the cowl portion 7, the lower end portion of the windshield 5, and the like.

  At this time, since the strap 50 satisfying L1> L2 is attached between the first position A and the second position B on the lower surface of the main body portion 32 of the airbag 21, the main body portion 32 of the airbag 21 is provided. Is bent by being pulled downward at the second position B, that is, at an intermediate position of the second air chamber 42, and the projecting portions 34 of the second air chamber 42 extend along the A pillars 14 on both sides of the windshield 5. Stable deployment.

  Then, when a pedestrian who has been lifted up and collides with the hood 3 with the airbag 21 deployed, the hood 3 is deformed with a sufficient stroke and exhibits a predetermined shock absorption characteristic. Reduce the impact on the. Further, the A pillar 14 and the uneven members of the cowl portion 7 are covered by the second air chamber 42, so that collision between these members and the pedestrian is avoided, and the pedestrian is protected.

  Thus, according to the present embodiment, in the so-called pedestrian protection airbag (pedestrian airbag) disposed in the automobile, the first air chamber 41 is positioned at the middle position of the lower surface of the second air chamber 42. Since the strap 50 connected to the side is provided, the second air chamber 42 of the airbag 21 and the like can be stably deployed, and pedestrians and the like can be effectively protected. That is, the strap 50 folded together with the main body portion 32 is unfolded together with the main body portion 32 and then pulls the second air chamber 42 and the like of the main body portion 32 downward, that is, the vehicle body 1 side in a state of being in contact with the vehicle body 1. In this way, it is possible to suppress the second air chamber 42 from swinging in both directions.

  Here, the length dimension L2 of the strap 50 between the first position A and the second position B is the length of the main body 32 of the airbag 21 between the first position A and the second position B. Since the base fabric 30 is set to be shorter than the length dimension L1 of the base fabric 30 in a state where the base fabric 30 is spread out on a plane, the intermediate position of the projecting portion 34 of the second air chamber 42 is lower when the airbag 21 is deployed. The air bag 21 can be reliably pulled along the pillar 14 and can be stably deployed along the A pillar 14.

  Furthermore, the lower surface of the strap 50 is coated with a low-slip rubber coating such as silicon so that the friction resistance is larger than the lower surface of the main body portion 32 of the airbag 21. By contacting the vehicle, for example, a point E that is a corner portion of the cowl top cover 8 shown in FIG. The air bag 21 can be stably deployed by positioning with respect to the A pillar 14.

  Further, the strap 50 is located at the second position of the second air chamber 42 with respect to the second air chamber 42 protruding from the first air chamber 41 around the predetermined direction C along the A pillar 14. Since it is arranged to incline toward the center (center axis O) side of the first air chamber 41 by a predetermined angle θ from the direction along the predetermined direction C from B, when the airbag 21 is deployed, the strap 50 The intermediate position of the second air chamber 42 projecting from the first air chamber 41 is pulled toward the center side of the first air chamber 41, and the airbag 21 is stable without swinging in both directions. Can be deployed.

  The main body 32 of the airbag 21, that is, a part of the lower surface of the first air chamber 41 and the second air chamber 42 is covered with the strap 50 by the strap 50, and is disposed on the cowl portion 7 of the vehicle body 1. The main body 32 can be protected from structures such as corners of the cowl top cover 8 and wipers.

  Further, since the strap 50 is folded and stored integrally with the main body portion 32 of the airbag 21, that is, the first air chamber 41 and the second air chamber 42, there is no need to fold the strap 50 separately. However, the manufacturing cost can be easily reduced. In addition, since the strap 50 is deployed together with the main body 32 of the airbag 21 at the initial stage of deployment of the airbag 21, and the strap 50 is not deployed so as to be in sliding contact with the cowl top cover 8, the strap 50 It can suppress being caught in structures, such as a wiper.

  Since the strap 50 is formed of the same base fabric as the main body portion 32 of the airbag 21, the strap 50 can be easily folded together with the main body portion 32. Further, the strap 50 is connected by sewing one end side to the second air chamber 42 and the other end side by inserting a mounting hole 52 into the bolt 53 of the retainer 24 that holds the airbag 21 in the case 25. Since it is locked and connected to the first air chamber 41 side, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  Further, since the bolt 53 of the retainer 24 that holds the airbag 21 in the case 25 also serves as a means for fixing the strap 50 to the first position A, the configuration can be simplified and the manufacturing cost can be reduced.

  In the above embodiment, the two straps 50 having a belt shape are used. However, the present invention is not limited to this configuration, and the strap can take various shapes. For example, as shown in FIG. 5, a strap 60 formed integrally with a single base cloth is provided with a portion sewn at the second position B of the second air chamber 42 on both sides at the end of both sides. It can also be used. The strap 60 covers the cowl portion 7 and the like widely, and can protect the body portion 32 of the airbag 21 from the structure of the vehicle body 1 such as the lower end of the windshield 5.

  The present invention can be applied to a vehicle having a hood at the front.

It is explanatory drawing which shows one Embodiment of the non-occupant protection apparatus of this invention, (a) is the state before deployment of an airbag, (b) is the state after deployment of an airbag. It is explanatory drawing of the state which unfolded the airbag of the non-occupant protection device same as the above on the plane. It is a top view of the strap of a nonoccupant protection device same as the above. It is explanatory drawing of a non-occupant protection apparatus same as the above. It is explanatory drawing of the state which unfolded the airbag which shows other embodiment of the non-occupant protection device of this invention on the plane.

Explanation of symbols

3 Hood 5 Windshield as windshield
10 Pedestrian protection device as non-occupant protection device
14 A-pillar as pillar
21 airbag
22 Inflator
24 Retainer as holding means
25 Case as storage
30 base fabric
41 First air chamber
42 Second air chamber
50 Strap A First position B Second position C Predetermined direction

Claims (6)

A hood provided at the front of the vehicle, a windshield positioned behind the hood, and pillars that support both sides of the windshield are folded into a storage portion below the rear of the hood of the vehicle. An air bag that is stored and supplied with gas and deployed.
A first air chamber that is supplied with a gas, expands, and presses the hood to move upward;
A second air chamber that communicates with the first air chamber, is supplied with gas and expands, and covers at least a part of the pillar portion;
Fold together with the first air chamber and the second air chamber in a state in which the first position on the first air chamber side and the second position at the intermediate position on the lower surface of the second air chamber are connected. An air bag characterized by comprising a strap that can be stored in. The length dimension of the strap between the first position and the second position is
2. The air according to claim 1, wherein the base fabric constituting the airbag between the first position and the second position is shorter than a length dimension of the base fabric in a state where the airbag is spread on a plane. bag. The strap is composed of a base fabric and is sewn and connected to the second air chamber, and is connected to the first air chamber side by being locked to a holding means for holding the airbag in the storage portion. The airbag according to claim 1 or 2. The second air chamber projects from the first air chamber around a predetermined direction,
The strap is disposed so as to be inclined from the second position of the second air chamber toward the center of the first air chamber from a direction along the predetermined direction. The airbag as described in any one of thru | or 3. The airbag according to any one of claims 1 to 4, wherein the lower surface of the strap is formed to have a larger frictional resistance than the lower surfaces of the first air chamber and the second air chamber. A storage part below the rear part of the hood of the vehicle, comprising a deformable hood provided at the front part of the vehicle, a windshield located behind the hood, and pillar parts supporting both side parts of the windshield The airbag according to any one of claims 1 to 5, wherein the airbag is stored in a folded state.
An inflator for supplying gas to the airbag;
Holding means for fixing the first air chamber and strap of the airbag at a first position and holding the airbag in the storage portion;
Control means for detecting a collision with a non-occupant and operating the inflator;
A non-occupant protection device comprising: a support portion that supports a rear portion of the hood so as to be movable upward.

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