JP2016011097A - Pedestrian protection airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pedestrian protection airbag device capable of stabilizing the deployment behavior of a lateral bag portion.SOLUTION: A pedestrian protection airbag device 10 comprises: an airbag 34 provided on a lower surface of a hood rear end portion 16A, expanded and deployed to a vehicle rear side from a clearance between the hood rear end portion 16A and a wind shield glass 30 by a pressure of gas generated by an inflator 26, and covering at least a front surface of a lower portion of a front pillar 31; and a spherical enlarged portion 28 formed in a rear end portion 33A of each lateral bag portion 33 in an expansion and deployment state, and having an internal space made larger than that of a general portion 33B.

Description

  The present invention relates to a pedestrian protection airbag device.

  2. Description of the Related Art A pedestrian protection airbag device is known that protects a pedestrian by inflating and deploying an airbag from a lower surface side of a rear end portion of a hood in a vehicle such as an automobile. As such a pedestrian protection airbag device, Patent Document 1 discloses a flip-up means for raising the rear end portion of the engine hood (hood) and air disposed on the lower surface of the rear end portion of the engine hood. A pedestrian protection airbag device comprising a bag device is disclosed. Further, the airbag device of Patent Document 1 is provided with a side bag portion that covers the front pillar in an inflated and deployed state.

JP 2007-112183 A

  However, the shape of the side bag part described in the cited document 1 is uniformly formed from the root part on the front end side to the rear end part. For this reason, when gas is supplied from the inflator to the side bag portion, the gas traveling toward the rear of the vehicle may collide (interfere) with the gas rebounding from the rear end portion of the side bag portion and traveling toward the front of the vehicle. . And this side collision expands a side bag part locally, and the reaction force above a vehicle acts from a front pillar and a windshield glass. As a result, the side bag portion may rise from the front pillar and the windshield glass, and the deployment behavior of the side bag portion may become unstable.

  In view of the above facts, an object of the present invention is to provide a pedestrian protection airbag device that can stabilize the deployment behavior of the side bag portion.

  The pedestrian protection airbag device according to the first aspect of the present invention is disposed on the lower surface of the rear end portion of the hood, and is formed between the rear end portion of the hood and the windshield glass by the gas pressure generated by the inflator. An airbag having a side bag portion that is inflated and deployed from the gap toward the rear side of the vehicle and covers at least the lower front surface of the front pillar, and a rear portion of the side bag portion in the inflated and deployed state. And a spherically enlarged portion in which the internal space is enlarged.

  In the pedestrian protection airbag device according to the first aspect of the present invention, an airbag including a side bag portion covering at least the lower front surface of the front pillar is disposed on the lower surface of the rear end portion of the hood. Yes. For this reason, when the inflator is actuated due to a collision with a pedestrian or the like, the side bag portion is inflated and deployed from the gap between the rear end of the hood and the windshield glass to the vehicle rear side by the pressure of gas generated by the inflator. The And a pedestrian is protected by the front side of the lower part of a front pillar being covered with a side bag part.

  Moreover, the spherical expansion part by which internal space was expanded rather than the general part is formed in the rear-end part of the side bag part. For this reason, when the inflator is activated, the gas that has flowed from the inflator to the rear of the vehicle and has reached the spherical enlarged portion is changed in direction along the inner surface of the spherical enlarged portion, and flows in a flow path different from the forward path to the front of the vehicle. In this way, it is possible to suppress a collision between the gas traveling toward the rear of the vehicle and the gas traveling toward the front of the vehicle during expansion and deployment. Even when the gas traveling toward the rear of the vehicle partially overlaps the flow path of the gas traveling toward the front of the vehicle, the side bag caused by gas collision is compared with the case where the spherical enlarged portion is not formed. The lifting of the part can be suppressed.

  A pedestrian protection airbag device according to a second aspect of the present invention is the pedestrian protection airbag device according to the first aspect of the present invention, wherein the spherical enlarged portion is formed so as to bulge to the vehicle upper side from the general portion. .

  In the pedestrian protection airbag device according to the second aspect of the present invention, the gas flowing from the inflator to the rear of the vehicle is guided upward of the vehicle along the inner surface of the spherical enlarged portion. Then, the side bag portion can be pressed down to the vehicle lower side by the gas flowing obliquely downward from the spherical enlarged portion toward the general portion, and the side bag portion is lifted from the front pillar and the windshield glass. It can be effectively suppressed.

  A pedestrian protection airbag device according to a third aspect of the present invention is the pedestrian protection airbag device according to the first or second aspect, wherein a boundary portion between the general portion and the spherical enlarged portion in the side bag portion is provided. A connecting member for connecting the upper and lower base fabrics of the side bag portion is provided.

  In the pedestrian protection airbag device according to the third aspect of the present invention, the shape of the spherical enlarged portion can be favorably maintained by the connecting member.

  As described above, the invention according to claim 1 has an excellent effect that the deployment behavior of the side bag portion can be stabilized.

  According to the invention which concerns on Claim 2, it has the outstanding effect that the lifting of a side bag part can be suppressed effectively.

  According to the invention which concerns on Claim 3, it has the outstanding effect that it can suppress that a spherical expansion part deform | transforms.

It is a top view which shows the principal part of the pedestrian protection airbag apparatus which concerns on 1st Embodiment, and is a figure which shows the operation state by which the airbag was inflate-deployed. It is an expanded sectional view which expands and shows the cut surface along the 2-2 line of FIG. It is a figure corresponding to Drawing 2 showing the flow path of gas at the time of inflation deployment of the side bag part concerning a 1st embodiment. It is sectional drawing corresponding to FIG. 2 which shows the non-operation state in which the airbag of the pedestrian protection airbag apparatus which concerns on 1st Embodiment was accommodated. It is a perspective view which shows the front part of the vehicle by which the pedestrian protection airbag apparatus which concerns on 1st Embodiment is mounted, and is a figure which shows the operation state by which the airbag was inflate-deployed. It is a top view which shows the principal part of the pedestrian protection airbag apparatus which concerns on 2nd Embodiment, and is a figure which shows the operation state by which the airbag was inflate-deployed. FIG. 3 is a view corresponding to FIG. 2 and showing a gas flow path when the side bag portion of the pedestrian protection airbag device of the comparative example is inflated and deployed. It is a figure corresponding to FIG. 2 which shows the state which the side bag part of the pedestrian protection airbag apparatus of the comparative example floated by receiving the reaction force from the windshield glass.

<First Embodiment>
Hereinafter, with reference to FIGS. 1-5, 1st Embodiment of the pedestrian protection airbag apparatus which concerns on this invention is described. In addition, an arrow FR appropriately shown in each drawing indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow RH indicates the vehicle right side in the vehicle width direction. Further, in the following description, when using the front / rear, up / down, and left / right directions, the front / rear direction of the vehicle, the up / down direction of the vehicle up / down direction, and the left / right direction in the traveling direction are indicated.

  As shown in FIG. 5, a hood 16 is provided above the engine room (power unit room) 14 of the vehicle 12 including the pedestrian protection airbag device according to the present invention. A windshield glass 30 is disposed behind the hood 16 in the vehicle. The windshield glass 30 is inclined obliquely upward rearward of the vehicle, and a lower portion 30A of the windshield glass 30 faces the rear end portion 16A of the hood 16 from the rear of the vehicle.

  The front end of the hood 16 is normally locked by a hood lock (not shown). Further, hood hinges (not shown) are arranged on both sides of the rear end portion 16A of the hood 16 in the vehicle width direction. The hood hinge includes a hinge base that is fixed to the vehicle body, and a hinge arm that has one end fixed to the hood and the other end pin-coupled to the hinge base and is swingable about the coupling point. It is configured. Further, on both sides of the rear end portion 16A of the hood 16 in the vehicle width direction, pop-up devices 18 that raise the rear end portion 16A of the hood 16 at the time of a collision with a pedestrian are disposed. In FIG. 5, the pop-up device 18 is illustrated as a rod-shaped member that rises when the gas generating means is operated. However, the present invention is not limited thereto, and other configurations may be applied. For example, the rear end portion 16A of the hood 16 may be popped up by a link mechanism.

  As shown in FIG. 4, the hood 16 is disposed outside the vehicle and forms a design surface of the hood 16, and a hood inner panel 22 is disposed on the engine room 14 side and reinforces the hood outer panel 20. , Including. Further, a skeleton portion 23 that swells toward the vehicle lower side and extends along the vehicle width direction is formed at the rear end portion of the hood inner panel 22.

  The skeleton part 23 is formed at a position offset toward the vehicle front side from the rear end part 16 </ b> A of the hood 16, and the skeleton part 23 forms a part of the closed cross section composed of the hood outer panel 20 and the hood inner panel 22. The rear end of the hood 16 is enlarged toward the vehicle lower side. And the storage space is formed in the vehicle rear side of this frame | skeleton part 23, The pedestrian protection airbag apparatus 10 (henceforth "the airbag apparatus 10" suitably) which concerns on this embodiment in this storage space is called. ) Is arranged.

(Configuration of pedestrian protection airbag device)
The airbag device 10 includes an airbag case 24, a pair of left and right inflators 26, and an airbag 34. The airbag case 24 includes a case main body 24A formed in a rectangular hollow body elongated in the vehicle longitudinal direction when viewed from the vehicle width direction, and a vehicle front side from a lower end portion of a front end portion of the case main body 24A. And a fixing portion 24B extending to the center. The fixing case 24 </ b> B is fastened and fixed to the frame portion 23 by the bolt 40 and the weld nut 42, so that the airbag case 24 is attached to the hood 16. In the present embodiment, as an example, the airbag case 24 is formed of metal, but is not limited thereto, and may be formed of a resin material such as fiber reinforced resin (FRP).

  In the case main body 24A, the upper and lower wall portions are disposed substantially parallel to each other, and the vehicle rear side wall portion is disposed substantially perpendicular to the upper and lower wall portions. Further, the wall portion on the vehicle front side is arranged so as to approach the wall portion on the vehicle rear side as it goes upward. Further, a tier portion 24C that is thinned by forming a V-shaped groove is formed at the upper corner portion of the rear end portion of the case main body portion 24A. The tier portion 24C has lower strength and rigidity than other portions (general portions) of the case main body portion 24A. For this reason, when the later-described airbag 34 starts to expand in the airbag case 24 and the tensile load applied to the tier portion 24C increases, the tier portion 24C is configured to break.

  The case main body 24A contains an airbag 34 and an inflator 26 that is activated upon collision with a pedestrian to eject gas. As an example, the airbag 34 is formed into a bag shape by sewing the outer peripheral portions of two base fabrics, and the airbag 34 is folded in a predetermined folding method such as bellows folding or roll folding. It is stored inside.

  Moreover, the airbag 34 is provided with the center bag part 32 and the side bag part 33, as FIG. 1 shows. The central bag portion 32 is disposed at the center in the vehicle width direction in an inflated and deployed state (inflated and deployed state), and covers the front surface of the lower portion 30A of the windshield glass 30 along the vehicle width direction. On the other hand, the side bag portion 33 communicates with the central bag portion 32 and extends from both ends of the central bag portion 32 in the vehicle width direction in the inflated and deployed state to the rear of the vehicle and above the vehicle. The front pillar 31 covers at least the lower front surface. Here, a spherical enlarged portion 28 is formed at the rear end portion of the side bag portion 33. The spherical enlarged portion 28 will be described later.

  A pair of inflators 26 are provided on the left and right sides with an interval in the vehicle width direction, and are disposed at the front end portion in the airbag case 24 with the vehicle width direction as a longitudinal direction. Further, as an example, the inflator 26 according to the present embodiment employs a so-called cylinder type inflator, and is disposed at intervals in the vehicle width direction. Here, as shown in FIG. 4, mounting brackets 36 made of a metal plate material are joined to the left and right inflators 26, respectively. These mounting brackets 36 extend to the lower surface side of the frame portion 23 and are fastened and fixed to the frame portion 23 by the bolts 40 and the weld nuts 42 described above. As a result, the left and right inflators 26 are fixed to the skeleton portion 23 of the hood 16 via the mounting bracket 36.

  A squib (ignition device) (not shown) is provided at the axial center of one end of the inflator 26 in the axial direction, and a gas generating agent that generates a large amount of gas by burning is in the inflator 26. Filled. Therefore, the airbag 34 can be inflated and deployed to the vehicle rear side with the pressure of the gas generated by the inflator 26.

  The inflator 26 contains a coolant for cooling the generated high-temperature gas and a filter for removing debris generated when the gas generating agent burns. The inflator 26 of the present embodiment is of a type that uses a gas generating agent, but an inflator of a type in which high-pressure gas is sealed may be used. A plurality of gas ejection holes are formed in the peripheral wall portion of the inflator 26.

  Furthermore, the inflator 26 is connected to a controller (airbag ECU) (not shown) disposed at the center of the vehicle body floor. The controller is connected to a collision detection sensor (not shown) or a collision prediction sensor (not shown) disposed on a front bumper (not shown) disposed at the front end of the vehicle 12 with the vehicle width direction as a longitudinal direction. As the collision detection sensor, for example, a chamber system or an optical fiber system in which a long pressure tube or a pressure chamber and a pressure sensor are arranged along the front bumper on the front surface side of the front bumper reinforcement can be applied. As the collision prediction sensor, for example, a pre-crash sensor that predicts a collision with a collision object such as a pedestrian using a millimeter wave radar or a stereo camera can be applied.

  Next, the spherical enlarged portion 28 according to the present embodiment will be described. As shown in FIG. 2, a spherical enlarged portion 28 is formed at the rear end portion 33A of the side bag portion 33 in the inflated and deployed state. The spherical enlarged portion 28 is formed so that the internal space is larger than the other portion (the general portion 33B) of the side bag portion 33, and in this embodiment, as an example, the side bag portion 33 in the general portion 33B. The thickness B in the spherical enlarged portion 28 is formed to be thicker than the thickness A. That is, a cut surface obtained by cutting the spherical enlarged portion 28 vertically along the vehicle longitudinal direction is enlarged more than the general portion 33B, and the spherical enlarged portion 28 is formed so as to bulge upward from the general portion 33B. Has been. However, the present invention is not limited to this, and it is only necessary that the internal space is enlarged compared to the general part 33B. .

  The spherical enlarged portion 28 is formed in a substantially spherical shape, and the rear end portion 28A of the spherical enlarged portion 28 has a substantially arc shape in cross section viewed from the vehicle width direction. Further, the lower portion of the spherical enlarged portion 28 is formed continuously with the general portion 33 </ b> B and is in contact with the front pillar 31 and the windshield glass 30. Further, the upper end portion of the spherical enlarged portion 28 has a substantially circular cross section in a side view continuously from the rear end portion 28A. The “spherical shape” here is not limited to a true spherical shape but includes a hemispherical shape, a semi-elliptical spherical shape, and the like, and includes a wide range of shapes that are partially spherical.

  Here, a strap 38 as a connecting member is provided at a boundary portion 33C between the general portion 33B and the spherical enlarged portion 28 in the side bag portion 33, and the shape of the spherical enlarged portion 28 is maintained by the strap 38. ing.

  As shown in FIG. 1, the strap 38 is a substantially string-like member provided in the center of the lateral bag portion 33 in the vehicle width direction and extending in the vertical direction. The base fabric is connected. Here, as an example in this embodiment, the width dimension D of the side bag portion 33 and the distance L (see FIG. 2) from the rear end portion 28A of the spherical enlarged portion 28 to the center portion of the strap 38 in the vehicle vertical direction. By providing the strap 38 at a substantially equal position, the spherical enlarged portion 28 is brought close to a true spherical shape.

  As shown in FIG. 2, the upper end portion of the strap 38 is bent toward the front side of the vehicle and is sewn on the upper base fabric. On the other hand, the lower end portion of the strap 38 is bent toward the vehicle front side in the same manner as the upper end portion, and is sewn on the lower base fabric. Not limited to this, the upper end portion and the lower end portion of the strap 38 may be bent to the opposite sides.

  In this embodiment, the strap 38 is attached to the base fabric by sewing. However, the strap 38 may be attached by other means, for example, the strap 38 is attached to the upper and lower base fabrics using an adhesive or the like. May be. Furthermore, in the present embodiment, the strap 38 is provided at the center of the side bag portion 33 in the vehicle width direction, but this is not limiting, and the number and arrangement of the straps 38 are not limited. Further, a partition cloth such as a tether may be used instead of the substantially string-like strap 38, or another connecting member may be used.

  Further, the spherical enlarged portion 28 may be formed without using a connecting member such as the strap 38. In this case, for example, the base fabric may be joined so that the rear end portion 33A of the side bag portion 33 bulges upward of the vehicle relative to the general portion 33B. Further, the bags may be woven together by a one-piece woven method called OPW. An OPW airbag is a non-sewn bag that weaves two pieces of cloth at the same time using a jacquard loom while connecting and weaving the necessary parts.

(Action and effect)
Next, the operation and effect of this embodiment will be described.

  In a state before the vehicle 12 collides with a pedestrian, the pop-up device 18 and the airbag device 10 are maintained in an inoperative state. That is, the rear end portion 16A of the hood 16 is not raised upward in the vehicle, and the airbag 34 is stored in a folded state in the airbag case 24 as shown in FIG.

  If it collides with a pedestrian from this state, it will be detected that it collided with the pedestrian by a collision detection sensor (not shown) provided in the front bumper reinforcement. The same applies when a collision with a pedestrian is predicted using a pre-crash sensor or a stereo camera. As a result, the pop-up device 18 is actuated by a controller (not shown), and the rear end portion 16A of the hood 16 is raised (popped up) to a predetermined height toward the vehicle upper side (see FIG. 5).

  Further, when the rising amount of the rear end portion 16A of the hood 16 reaches a predetermined amount, the inflator 26 of the airbag device 10 is operated by a controller (not shown). For this reason, gas is ejected from the gas ejection portion of the inflator 26, and the gas is supplied into the folded airbag 34. As a result, the airbag 34 starts to expand in the airbag case 24, and the tensile load applied to the tier portion 24C of the airbag case 24 increases. When the tensile load applied to the tier portion 24C reaches a predetermined value, the tier portion 24C breaks, and the airbag case 24 expands vertically in a rear opening shape.

  Thereby, as shown in FIG. 1, the airbag 34 is inflated and deployed from the gap between the rear end portion 16 </ b> A of the hood 16 and the lower portion 30 </ b> A of the windshield glass 30 toward the vehicle rear side. In the inflated and deployed state, the front surface of the lower portion 30 </ b> A of the windshield glass 30 is covered by the central bag portion 32. Further, at least the lower front surface of the front pillar 31 is covered by the pair of left and right side bag portions 33 to protect a pedestrian.

  Here, the behavior at the time of inflation and deployment will be described for each of the side bag portion 33 according to the present embodiment and the side bag portion 100 of the comparative example. First, the behavior at the time of inflating and deploying the side bag part 100 of the comparative example will be described with reference to FIGS. Note that the side bag portion 100 of the comparative example is not formed with the spherical enlarged portion 28, and is uniformly formed up to the rear end portion 100A. That is, the internal space in the rear end portion 100A of the side bag portion 100 and the internal space in the general portion 100B have substantially the same size. About another structure, it is comprised similarly to the side bag part 33 which concerns on this embodiment.

  As shown in FIG. 7, when gas is supplied from the inflator 26 to the side bag portion 100 of the comparative example, the gas flowing from the inflator 26 to the rear of the vehicle rebounds from the rear end portion 100 </ b> A of the side bag portion 100. The gas flowing forward of the vehicle collides (interferences). Thereby, the force F1 and F2 which go to the outside mutually act on the part which the gas in the side bag part 100 collided, and tries to expand | swell locally.

  When the side bag portion 100 locally expands at the location where the gas collides, a reaction force F3 above the vehicle acts on the side bag portion 100 from the windshield glass 30 as shown in FIG. As a result, the side bag part 100 is lifted from the windshield glass 30. For this reason, the position of the side bag part 100 may shift | deviate by the recoil which floated, and the behavior at the time of the expansion | deployment deployment of the side bag part 100 will become unstable. Note that the two-dot chain line G3 and the two-dot chain line G4 in FIG. 7 indicate the main flow paths of the gas supplied from the inflator 26, and do not indicate the flow paths through which all the gas flows. Although the front pillar is not shown in FIGS. 7 and 8, the reaction force F <b> 3 acts on the side bag portion 100 from the front pillar as well as the windshield glass 30.

  Next, the behavior at the time of inflating and deploying the side bag portion 33 according to the present embodiment will be described. As shown in FIG. 3, when gas is supplied from the inflator 26 to the side bag portion 33 according to the present embodiment, the gas passes through the side bag portion 33 as indicated by a two-dot chain line G1 in the figure. The vehicle flows rearward and upward of the vehicle and reaches the rear end portion 28A of the spherical enlarged portion 28.

  Here, the gas that has reached the rear end portion 28A is changed in direction while being guided upward along the substantially arc-shaped inner surface of the spherical enlarged portion 28, and as shown by a two-dot chain line G2 in the figure, the side bag portion. The vehicle flows along the upper surface of the vehicle 33 forward and downward of the vehicle. In this way, most of the gas whose direction has been changed by the spherical enlarged portion 28 flows through a flow path different from the gas flowing in the forward direction toward the rear of the vehicle, so that the collision of the gases can be suppressed (avoided). it can. As a result, the lifting of the side bag portion 33 is suppressed, and the deployment behavior of the side bag portion 33 can be stabilized.

  Note that the two-dot chain line G1 and the two-dot chain line G2 in FIG. 3 indicate the main flow paths of the gas supplied from the inflator 26, and do not indicate the flow paths through which all the gas flows. In addition, even when a gas flowing toward the rear of the vehicle collides with a part of the gas flowing toward the front of the vehicle, compared with the configuration including the side bag portion 100 of the comparative example in which the spherical enlarged portion 28 is not formed. The floating of the side bag portion 33 due to gas collision can be suppressed.

  Furthermore, in this embodiment, since the spherical enlarged portion 28 is formed so as to bulge upward from the vehicle relative to the general portion 33B, the gas that has been guided upward by the spherical enlarged portion 28 and changed its direction is the spherical enlarged portion. It flows diagonally downward from 28 toward the general part 33B. Thereby, the vehicle lower side force acts on the side bag portion 33, and the side bag portion 33 can be pressed against the windshield glass 30. As a result, it is possible to effectively suppress the side bag portion 33 from floating from the front pillar 31 and the windshield glass 30.

  Moreover, in this embodiment, the strap 38 is provided in the boundary part 33C of the general part 33B and the spherical expansion part 28 in the side bag part 33, and the upper and lower base fabrics are connected. Thereby, the shape of the spherical enlarged portion 28 can be maintained satisfactorily. That is, it is possible to prevent the spherical enlarged portion 28 from being deformed by the strap 38, and it is possible to avoid the unfolding behavior of the side bag portion 33 accompanying this deformation.

  In addition, although this embodiment demonstrated the structure provided with the pop-up apparatus 18, you may apply this invention not only to this but to the vehicle which is not equipped with the pop-up apparatus. In this case, for example, the rear end portion of the hood may be raised by the pressure during inflation and deployment of the airbag.

Second Embodiment
Next, with reference to FIG. 6, 2nd Embodiment of the pedestrian protection airbag apparatus for vehicles which concerns on this invention is described. The pedestrian protection airbag device 50 according to this embodiment (hereinafter referred to as “airbag device 50” as appropriate) is the same as that of the first embodiment described above except that the shape of the spherical enlarged portion 58 is different. It is the composition. Moreover, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  As shown in FIG. 6, the airbag apparatus 50 of the present embodiment includes an airbag 52, and the airbag 52 includes a central bag portion 54 and a side bag portion 56. The central bag portion 54 is disposed at the central portion in the vehicle width direction in the inflated and deployed state, and covers the front surface of the lower portion 30A of the windshield glass 30 along the vehicle width direction. On the other hand, the side bag portion 56 communicates with the central bag portion 54 and extends from the both ends of the central bag portion 54 in the vehicle width direction to the vehicle rear side and the vehicle upper side in an inflated and deployed state. The front pillar 31 covers at least the lower front surface.

  Here, a spherical enlarged portion 58 is formed at the rear end portion 56A of the side bag portion 56 in the inflated and deployed state. The spherical enlarged portion 58 is formed so that the internal space is enlarged more than the general portion 56B. In the present embodiment, as an example, the width of the spherical enlarged portion 58 is larger than the width of the side bag portion 56 of the general portion 56B. Is formed wider. That is, the cut surface obtained by cutting the spherical enlarged portion 58 up and down along the vehicle width direction is larger than the general portion 56B.

  The spherical enlarged portion 58 is formed in a substantially spherical shape, and the rear end portion 58A of the spherical enlarged portion 58 has a substantially arc shape in cross section viewed from the vehicle width direction. Further, the lower portion of the spherical enlarged portion 58 is formed continuously with the general portion 56 </ b> B and is in contact with the front pillar 31 and the windshield glass 30.

  In the present embodiment, the general portion 56B and the spherical enlarged portion 58 are formed so as to be continuous in a side view. However, the present invention is not limited to this, and the spherical enlarged portion 58 is replaced with the general portion 56B as in the first embodiment. It may be formed so as to bulge upward from the vehicle. In this case, a strap 38 may be provided.

(Action and effect)
According to the airbag device 50 of the present embodiment, similarly to the first embodiment, it is possible to avoid gas collision during inflation and deployment and to stabilize the deployment behavior of the side bag portion 56.

  As described above, the pedestrian protection airbag device according to the first embodiment and the second embodiment of the present invention has been described. However, these embodiments may be appropriately combined and used without departing from the gist of the present invention. Of course, it can be implemented in various modes.

10 Pedestrian Protection Airbag Device 16 Hood 16A Rear End (Hood Rear End)
26 inflator 28 spherical enlarged portion 30 windshield glass 31 front pillar 34 airbag 33 side bag portion 33A rear end portion (rear end portion of side bag portion)
33B General part (General part of the side bag part)
33C Boundary part 38 Strap (connecting member)
50 Pedestrian Protection Airbag Device 52 Airbag 56 Side Bag Part 56A Rear End (Rear End Part of Side Bag Part)
56B General part (General part of side bag part)
58 Spherical enlargement

Claims (3)

A front surface of at least the lower portion of the front pillar, which is disposed on the lower surface of the rear end portion of the hood and is inflated and deployed from the gap between the rear end portion of the hood and the windshield glass with the pressure of the gas generated by the inflator to the vehicle rear side. An airbag with a side bag portion covering the
A spherically enlarged portion formed at the rear end portion of the side bag portion in the inflated and deployed state, the inner space of which is expanded from the general portion;
A pedestrian protection airbag device.   2. The pedestrian protection airbag device according to claim 1, wherein the spherical enlarged portion is formed so as to bulge upward of the vehicle relative to the general portion.   The pedestrian according to claim 1 or 2, wherein a connecting member for connecting upper and lower base fabrics of the side bag portion is provided at a boundary portion between the general portion and the spherical enlarged portion in the side bag portion. Protective airbag device.

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