JP6052158B2 - Pedestrian protection airbag device - Google Patents

Description

  The present invention relates to a pedestrian protection airbag device provided in a vehicle such as an automobile.

  2. Description of the Related Art A pedestrian protection airbag device that protects a pedestrian by inflating and deploying an airbag bag body on a hood of a vehicle such as an automobile is known. As such a pedestrian protection airbag device, in Patent Document 1, an airbag case in which an airbag bag body is accommodated is disposed at a rear end portion of a hood, and a front end portion of the airbag case is attached to a bolt (attachment). The pedestrian protection airbag apparatus attached to the hood by the member) is disclosed.

JP 2003-89333 A

  However, in the invention of Patent Document 1, the rear end portion of the airbag case is not fixed, and the airbag case is in a cantilever support state. For this reason, although it is necessary to reinforce so that the rear end portion of the airbag case does not sag due to vibration of the vehicle or the like, it is not preferable in terms of weight, cost, and space. On the other hand, as a countermeasure against the cantilever support state, a method of fixing the airbag case at the front and rear of the vehicle can be considered, but when the airbag bag body is inflated and deployed, it is caught by the mounting member on the rear side of the vehicle and deployed in the target direction. It can be difficult.

  In consideration of the above-described facts, the present invention provides a pedestrian protection airbag device capable of maintaining the attachment state of the airbag case satisfactorily while attaching the airbag case so as not to hinder the inflation and deployment of the airbag bag body. The purpose is to provide.

  The pedestrian protection airbag device according to the first aspect of the present invention is disposed on the lower side of the rear end portion of the hood whose rear end portion can be raised to the vehicle upper side, and extends in the vehicle width direction. An airbag case that extends in the vehicle width direction and is stored in the airbag case and covers at least a part of the cowl when deployed, and a vehicle from both ends of the cowl bag body. A front pillar bag body portion which is folded back to the center side in the width direction and back to the vehicle and accommodated in the airbag case and covers at least the lower part of the front pillar during deployment; and the cowl bag body portion for generating gas and An inflator that inflates and deploys the front pillar bag body portion toward the vehicle rear side, a front attachment member that fixes a front end portion of the airbag case to the hood, and a vehicle width direction of the airbag case Provided in the central portion, having a side mounting member after fixing the rear end portion of the airbag case to the hood at a position that does not overlap with the trajectory at the time of deployment of the front pillar bag body portion.

  According to the pedestrian protection airbag device of the first aspect of the present invention, the airbag case houses the cowl bag body portion and the front pillar bag body portion as the airbag bag body. Further, the cowl bag body portion extends in the vehicle width direction, and when the gas is supplied by operating the inflator, the cowl bag body portion is inflated and deployed toward the vehicle rear side to cover at least a part of the cowl. Further, since the front pillar bag body portion is folded and housed from both ends in the vehicle width direction of the cowl bag body portion toward the vehicle rear side, when the gas is supplied from the inflator, the cowl bag body portion The vehicle is inflated and deployed so as to open from the vehicle side to the vehicle rear side, and covers at least part of the left and right front pillars.

  Here, the front end portion of the airbag case is attached to the hood by a front attachment member, and the rear end portion of the airbag case is attached to the hood by a rear attachment member. Thus, by fixing the front and rear of the airbag case to the hood, it is possible to prevent the rear end portion of the airbag case from sagging due to vibration or the like, and it is possible to maintain a favorable mounting state of the airbag case. .

  Further, the rear mounting member is provided at the center of the airbag case in the vehicle width direction, and the rear end of the airbag case is hooded at a position that does not overlap with the locus when the front pillar bag body is deployed. It is attached to. Thus, when the front pillar bag body portion is opened from the cowl bag body portion to the vehicle side and the vehicle rear side and inflated and deployed, the rear mounting member does not interfere with the front pillar bag body portion, and is desired. It can be inflated and deployed to the target position at the timing of.

  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 airbag case has a cleaving portion formed by inflation pressure of the cowl bag body portion and the front pillar bag body portion. It is a box-shaped member that is cleaved at the starting point, and the cleaving portion is formed at a position that covers a part of the airbag case to cover the rear attachment member from the vehicle lower side when the airbag case is cleaved. Has been.

  According to the pedestrian protection airbag device according to the second aspect of the present invention, when the airbag case is cleaved from the cleavage portion by the inflation pressure of the cowl bag body portion and the front pillar bag body portion, The rear side attachment member is covered by a part of the airbag case from the vehicle lower side. As a result, it is possible to prevent the cowl bag body portion and the front pillar bag body portion that are being deployed from being damaged by being in contact with the rear mounting member or being caught by the rear mounting member.

  A pedestrian protection airbag device according to a third aspect of the present invention is the pedestrian protection airbag device according to the first aspect, wherein a guide portion is provided between the rear attachment member and the cowl bag body portion, The guide portion abuts on the cowl bag body portion that has been inflated and deployed, and causes the cowl bag body portion to ride over the rear attachment member.

  According to the pedestrian protection airbag device according to the third aspect of the present invention, the cowl bag body portion abuts on the guide portion in the middle of being inflated and deployed toward the vehicle rear side, and is rearward along the guide portion. It is inflated and deployed so as to get over the side attachment member. Thereby, it can suppress that the bag body part for cowl in the middle of expansion | deployment contacts with a rear side attachment member, and is damaged regardless of the position which provides a rear side attachment member.

  As described above, the pedestrian protection airbag device according to the present invention fixes the airbag case so as not to hinder the inflation and deployment of the airbag bag body (front pillar bag body portion). It has the outstanding effect that the attachment state of can be maintained favorable.

It is a top view which shows the front part of the vehicle by which the pedestrian protection airbag apparatus which concerns on 1st Embodiment of this invention is mounted, and is a figure which shows the state in which the airbag bag body was accommodated. It is an expanded sectional view which expands and shows the cut surface along the 2-2 line of FIG. It is an expanded sectional view which expands and shows the cut surface along line 3-3 in FIG. It is a top view which shows the front part of the vehicle by which the pedestrian protection airbag apparatus which concerns on 1st Embodiment of this invention is mounted, and is a figure which shows the state by which the airbag body was inflate-deployed. It is an expanded sectional view which expands and shows the cut surface along line 5-5 in FIG. It is a top view which shows the front part of the vehicle by which the pedestrian protection airbag apparatus which concerns on 2nd Embodiment of this invention is mounted, and is a figure which shows the state in which the airbag bag body was accommodated. It is a top view which shows the front part of the vehicle by which the pedestrian protection airbag apparatus which concerns on 2nd Embodiment of this invention is mounted, and is a figure for demonstrating the state by which the airbag bag body was inflate-deployed. It is sectional drawing corresponding to FIG. 3 which shows the state in which the airbag bag body of the pedestrian protection airbag apparatus which concerns on 3rd Embodiment of this invention was accommodated. It is sectional drawing corresponding to FIG. 5 which shows the state by which the airbag bag body of the pedestrian protection airbag apparatus which concerns on 3rd Embodiment of this invention was expand | deployed.

<First Embodiment>
Hereinafter, a pedestrian protection airbag device according to a first embodiment of the present invention will be described with reference to FIGS. 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.

(Configuration of pedestrian protection airbag device)
FIG. 1 is a plan view schematically showing a configuration of a front portion of a vehicle 12 on which a pedestrian protection airbag device according to the first embodiment of the present invention is mounted. As shown in FIG. 1, a hood 14 is provided on the upper surface of the front side of the vehicle 12 so as to open and close the engine room. The front end of the hood 14 is normally locked by a hood lock (not shown). Has been. Further, hood hinges (not shown) are arranged on both sides of the rear end portion of the hood 14 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 of the hood 14 in the vehicle width direction, pop-up devices (not shown) that raise the rear end portion of the hood 14 at the time of a collision with a pedestrian are arranged. As the pop-up device, various configurations such as a configuration in which the rod-shaped member is raised by the operation of the gas generating means and a configuration in which the rear end portion of the hood 14 is popped up by the link mechanism can be adopted.

  A windshield glass 16 is disposed on the rear side of the hood 14. The windshield glass 16 is disposed so as to be inclined upward from the vehicle front side toward the vehicle rear side, and an upper end portion of the windshield glass 16 is connected to the roof 18. A pair of left and right front pillars 20 are provided at both ends of the windshield glass 16 in the vehicle width direction. The front pillar 20 extends in the vehicle vertical direction along the windshield glass 16, and is inclined upward from the vehicle front side toward the vehicle rear side. Further, a cowl 22 is disposed between the windshield glass 16 and the hood 14, and a pedestrian protection airbag device 10 (hereinafter referred to as “airbag device 10” as appropriate) is provided on the cowl 22 in front of the vehicle. Is provided).

  The airbag device 10 mainly includes an airbag case 24, an inflator 26, and an airbag bag body 28. The airbag bag body 28 includes a cowl bag body portion 30 and a front pillar bag body portion 32 that are integrally formed. The airbag case 24 is a long, resin-made box-like member that is disposed at the rear end of the hood 14 and extends in the vehicle width direction. As shown in FIG. 34, a front flange portion 36, and a rear flange portion 38.

  Here, the hood 14 includes a hood outer panel 14A that is disposed outside the vehicle and forms a design surface, and a hood inner panel 14B that is disposed on the engine room side and reinforces the hood outer panel 14A. The rear end portions of both are joined by hemming. A bulge portion 14C that bulges downward is formed on the rear end side of the hood inner panel 14B. The bulging portion 14 </ b> C extends in the vehicle width direction, and is formed at a position offset to the vehicle front side from the rear end portion of the hood 14. Thus, a storage space is formed on the vehicle rear side of the bulging portion 14C of the hood inner panel 14B, and the storage portion 34 of the airbag case 24 is disposed in this storage space.

  The storage portion 34 includes an upper surface plate 40 that constitutes the upper surface and a lower surface plate 42 that constitutes the lower surface. A front plate 44 that is inclined obliquely downward along the bulge portion 14C of the hood inner panel 14B is provided between the front end portion of the upper surface plate 40 and the front end portion of the lower surface plate 42. 44, the front end portions of the upper surface plate 40 and the lower surface plate 42 are connected to each other. Further, the rear end portion of the upper surface plate 40 and the rear end portion of the lower surface plate 42 are connected by a rear surface plate 46 extending in the vertical direction.

  Here, at the rear end portion of the lower surface plate 42, a tear line 48 is formed as a cleavage portion that is thinned by forming a groove having a substantially V-shaped cross section. The tear line 48 is formed continuously or intermittently along the vehicle width direction, and has lower strength and rigidity than the general part. Thereby, the airbag case 24 is configured to be cleaved from the tear line 48 as a starting point.

  Further, a first fold point 51 that is thinned by forming a groove having a substantially arc-shaped cross section is formed at the front end portion of the lower surface plate 42. The first folding point 51 is formed in the inner wall surface of the lower surface plate 42 as a shallow groove from the tear line 48. When the airbag case 24 is torn apart from the tear line 48, the lower surface plate 42 between the tear line 48 and the first folding point 51 starts from the first folding point 51 to the lower side and the front side of the vehicle. It is configured to bend (deform).

  On the other hand, at the upper end portion of the rear plate 46, a second fold point 53 is formed which is thinned by forming a groove having a substantially arc-shaped cross section. Similar to the first folding point 51, the second folding point 53 is formed by a shallower groove than the tear line 48. When the airbag case 24 is cleaved from the tear line 48, the second folding point 53 and the second folding point 53 are connected to the second folding point 53. The rear plate 46 between the folding point 53 is configured to bend (deform) upward and rearward of the vehicle with the second folding point 53 as a base point.

  In the storage portion 34 configured as described above, the inflator 26 and the airbag bag body 28 are stored. The inflator 26 is a conventionally known cylinder type inflator and is stored on the vehicle rear side of the storage portion 34. The inflator 26 is formed in a substantially cylindrical shape and extends in the vehicle width direction. In the present embodiment, a pair of left and right inflators 26 is provided as an example (see FIG. 1).

  Here, the inflator 26 is electrically connected to a control device (not shown). When the inflator 26 is actuated by a command from the control device, gas is generated and supplied to the airbag bag body 28. Thereby, the airbag bag body 28 is inflated and deployed toward the vehicle rear side. As the control device, there is a controller (airbag ECU) or the like disposed in the center of the vehicle body floor, and this controller is a collision detection sensor (not shown) or collision prediction disposed in a front bumper (not shown). It is connected to a sensor (not shown). As the collision detection sensor, for example, a chamber method, an optical fiber method, a pressure tube method, or the like in which a long chamber and a pressure sensor are arranged along the front bumper on the front side of the bumper reinforcement can be applied. Further, as the collision prediction sensor, for example, a pre-crash sensor or the like that is disposed in the center of the front bumper and predicts a collision with a collision object such as a pedestrian using a millimeter wave radar or a stereo camera can be applied.

  An airbag bag body 28 is connected to the inflator 26. The airbag bag body 28 is formed, for example, by cutting out a nylon-based or polyester-based cloth material and sewing a plurality of base fabrics, and includes a cowl bag body portion 30 and a front pillar bag body portion 32. It is equipped with. As shown in FIG. 1, the cowl bag body portion 30 is housed in the front side of the housing portion 34 and extends in the vehicle width direction.

  Further, when the gas is supplied from the inflator 26, the cowl bag body 30 is inflated and deployed toward the vehicle rear side, and is configured to cover at least a part of the cowl 22, as shown in FIG. . In the present embodiment, the cowl bag body 30 is configured to cover the entire area of the cowl 22 and the rear end portion of the hood 14, but the present invention is not limited thereto, and at least a part of the cowl 22 is covered. If so, the range covered by the cowl bag body 30 may be changed as appropriate in accordance with the performance and specifications required of the airbag device 10.

  On the other hand, as shown in FIG. 1, the front pillar bag body portion 32 is provided integrally with the cowl bag body portion 30, and extends from both ends of the cowl bag body portion 30 in the vehicle width direction. It is folded back to the center side and the rear side and stored in the airbag case 24. Further, the front pillar bag body portion 32 extends in the vehicle width direction along the cowl bag body portion 30 in a folded state, and reaches the center of the cowl bag body portion 30 in the vehicle width direction. It is formed with a length that does not reach it.

  Here, when the gas is supplied from the inflator 26, the front pillar bag body portion 32 is inflated and deployed so as to open from the cowl bag body portion 30 to the vehicle side and rear side, as shown in FIG. The left and right pair of front pillars 20 are configured to cover at least the lower part. In addition, the dashed-two dotted line L in a figure shows the locus | trajectory of the front-end | tip part of the bag part 32 for front pillars at the time of expansion | deployment.

  Here, as shown in FIG. 2, a front flange portion 36 is provided on the vehicle front side from the storage portion 34 in which the inflator 26 and the airbag bag body 28 are stored. The front flange portion 36 is formed to extend forward from the front end portion of the lower surface plate 42 along the bulging portion 14C of the hood inner panel 14B, and a bolt hole 36A is formed in the front flange portion 36. . As shown in FIG. 1, a plurality of bolt holes 36A are formed at intervals in the vehicle width direction along the airbag case 24. In this embodiment, as an example, six bolt holes 36A are formed. Has been.

  As shown in FIG. 2, a bolt 50 as a front mounting member is inserted into the bolt hole 36A from the lower surface side of the hood inner panel 14B. The bolt 50 is screwed into a nut (weld nut) 52 provided on the upper surface of the hood inner panel 14B, and the front end portion of the airbag case 24 is fastened and fixed to the lower surface of the hood inner panel 14B. It should be noted that the bolts 50 are inserted through all the six bolt holes 36A illustrated in FIG.

  On the other hand, as shown in FIG. 1, a rear flange portion 38 is provided on the vehicle rear side from the storage portion 34. The rear flange portion 38 is provided at the center of the airbag case 24 in the vehicle width direction, and extends rearward along the hood inner panel 14B from the rear end portion of the top plate 40 as shown in FIG. Has been issued. A bolt hole 38 </ b> A is formed at the center in the width direction of the rear flange portion 38.

  Only one bolt hole 38A is formed in the rear flange portion 38, and a bolt 54 as a rear mounting member is inserted into the bolt hole 38A. Further, in the present embodiment, as an example, a bolt whose head is flatter than the bolt 50 inserted into the front flange portion 36 is used, and is inserted into the bolt hole 38A from the upper surface side of the hood inner panel 14B and welded. ing. The bolt 54 is screwed into a nut 56 provided on the lower surface side of the hood inner panel 14B, and the rear end portion of the airbag case 24 is fastened and fixed to the lower surface of the hood inner panel 14B. However, the present invention is not limited thereto, and a bolt having substantially the same shape as that of the bolt 50 may be inserted and fixed from the lower surface side of the hood inner panel 14B.

  In the present embodiment, the front flange portion 36 is fastened and fixed by the bolt 50 and the nut 52, and the rear flange portion 38 is fastened and fixed by the bolt 54 and the nut 56. May be used. For example, you may use the attachment member which can be attached with 1 components, such as a clip.

  Here, as shown in FIG. 4, the bolt hole 38 </ b> A formed in the rear flange portion 38 is formed at a position that does not overlap with the locus L when the front pillar bag body portion 32 is inflated and deployed in plan view. Yes. That is, the rear end portion of the airbag case 24 is attached to the hood inner panel 14B at a position that does not overlap the locus L in plan view.

(Action and effect)
Next, the operation and effect of the pedestrian protection airbag device of this embodiment will be described. As shown in FIG. 3, in the airbag device 10 according to this embodiment, the front flange portion 36 is fastened and fixed to the hood inner panel 14 </ b> B with bolts 50 and nuts 52, and the rear flange portion 38 is bolts 54 and 54. The nut 56 is fastened and fixed to the hood inner panel 14B. In this manner, the front end portion and the rear end portion of the airbag device 10 are fastened and fixed to the hood inner panel 14B, so that the airbag case 24 is attached as compared with a cantilever structure in which only one of the front and rear end portions is fastened and fixed. The state can be maintained well. That is, in the case of cantilever support, when vibration or the like is input to the hood 14 while the vehicle is running, the free end side moves and the fastening strength (holding strength) may decrease or sag. In the present embodiment, the front end portion and the rear end portion of the airbag case 24 are fastened and fixed, so that the attachment state can be maintained well and the airbag case 24 can be prevented from hanging down.

  Further, when the airbag case 24 is fastened and fixed in a cantilevered state, measures such as reinforcing the airbag case 24 to increase the rigidity in order to suppress the sagging are necessary. By fastening and fixing the front end portion and the rear end portion of the airbag case 24, it is possible to maintain the attachment state well without reinforcing the airbag case 24.

  In particular, in the present embodiment, as shown in FIG. 1, a rear flange portion 38 is provided and fixed at the center of the airbag case 24 in the vehicle width direction. For this reason, since only one fastening portion is required, the airbag case 24 is secured with a fastening strength (holding strength) while securing the fastening strength (holding strength) of the airbag case 24 as compared with a case where both ends of the airbag case 24 in the vehicle width direction are fastened and fixed. The development space of the bag bag body 28 can be secured.

  Further, in the pedestrian protection airbag device according to the present embodiment, the bolt 54 and the nut 56 of the rear flange portion 38 can be prevented from obstructing the inflation and deployment of the airbag bag body 28. This operation will be described below.

  For example, when a pedestrian and the vehicle 12 collide, a signal is transmitted from a sensor or the like that detects the collision to the control device, and the pop-up hood mechanism and the airbag device 10 are operated by the control device. Thereby, the rear-end part of the hood 14 is raised to the vehicle upper side.

  When the rising amount of the rear end portion of the hood 14 reaches a predetermined amount, the control device generates gas from the inflator 26 of the airbag device 10 and supplies the gas to the cowl bag body 30 and the front pillar bag body 32. Is done. As a result, as shown in FIG. 5, the airbag case 24 is cleaved starting from the tear line 48 by the inflation pressure of the cowl bag body 30 and the front pillar bag body 32.

  When the airbag case 24 is cleaved, the lower surface plate 42 bends downward and forward from the first folding point 51 at the front end. Thereby, the opening area of the opened airbag case 24 can be increased. The rear plate 46 bends upward and rearward from the second folding point 53 at the upper end. As a result, the bolt 50 and the nut 52 that fasten and fix the rear flange portion 38 to the hood inner panel 14 </ b> B are covered by the rear plate 46 from the vehicle lower side. As a result, the cowl bag body 30 is prevented from coming into contact with the bolts 54 and nuts 56 while being inflated and deployed, and the cowl bag body 30 is prevented from being damaged or caught by the bolts 54 and nuts 56. can do.

  Subsequently, as shown in FIG. 4, the cowl bag body 30 inflated and deployed from the hood 14 to the outside of the vehicle has at least a part of the cowl 22 on the vehicle rear side and the upper surface of the rear end portion of the hood 14. cover.

  On the other hand, when the gas is supplied from the inflator 26, the front pillar bag portion 32 is turned from the folded state (the state indicated by the two-dot chain line in FIG. 4) to the cowl bag portion 30 on the vehicle side. Inflated and deployed so as to open toward the rear side. Then, the front pillar bag body portion 32 folded back at the right end portion of the cowl bag body portion 30 covers at least the lower part of the right front pillar 20 and is folded back to the left side of the cowl bag body portion 30. The front pillar bag 32 covers at least the lower part of the left front pillar 20.

  Here, as shown in FIG. 3, the rear flange portion 38 is fastened and fixed to the hood inner panel 14B at a position that does not overlap with the locus L when the front pillar bag body portion 32 is inflated and deployed in plan view. Has been. For this reason, for example, even when the bolt 54 and the nut 56 are not covered with the rear plate 46 when the airbag case 24 is cleaved, the bolt 54 and the nut 56 are in the process of inflating and deploying the front pillar bag body portion 32. The front pillar bag body portion 32 can be inflated and deployed at a desired timing without being caught on. In addition, the front pillar 20 can be covered and expanded at a target position.

  In the present embodiment, the front flange portion 36 is fastened and fixed by the six bolts 50 and nuts 52. However, the present invention is not limited to this, and if the fastening strength (holding strength) of the airbag case 24 can be secured, the front flange portion 36 is not more than five. The bolt 50 and the nut 52 may be fastened and fixed. Conversely, it may be fastened and fixed with seven or more bolts 50 and nuts 52.

  In the present embodiment, as shown in FIG. 2, the first fold point 51 and the second fold point 53 are formed in addition to the tear line 48. However, the present invention is not limited to this. When the case 24 is deformed, only the tear line 48 is formed, and the first break point 51 and the second break point 53 may not be formed.

  Furthermore, in the present embodiment, the rear flange portion 38 is formed at the center of the airbag case 24 in the vehicle width direction. However, the present invention is not limited to this, and the length of the storage portion 34 in the vehicle width direction is the same as that of the front flange portion 36. The rear flange portion 38 may be formed with substantially the same length.

Second Embodiment
Next, a pedestrian protection airbag device according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably. As shown in FIG. 6, a pedestrian airbag device 60 (hereinafter referred to as “airbag device 60” as appropriate) equipped with the pedestrian protection airbag device according to the present embodiment includes an airbag case 62. Except for this, the configuration is the same as in the first embodiment.

  That is, the airbag device 60 is attached to the vehicle 12 similar to that of the first embodiment, and mainly includes the airbag case 62, the inflator 26, and the airbag bag body 28. The airbag bag body 28 includes a cowl bag body portion 30 and a front pillar bag body portion 32. Furthermore, the airbag case 62 includes a box-shaped storage portion 65, a front flange portion 64, and a rear flange portion 66.

  The front flange portion 64 is formed to extend forward from the front end portion of the storage portion 65 along the hood 14, and the front flange portion 64 is formed with a bolt hole 64 </ b> A. A plurality of bolt holes 64A are formed at intervals in the vehicle width direction along the airbag case 62. In the present embodiment, six bolt holes 64A are formed as an example.

  On the other hand, the rear flange portion 66 is formed to be slightly longer in the vehicle width direction than the storage portion 65, and is formed to extend rearward along the hood 14 from the rear end portion of the storage portion 65. The rear flange portion 66 is formed with three bolt holes 66A. The bolt holes 66 </ b> A are respectively formed at the center portion of the rear flange portion 66 in the vehicle width direction and at both ends of the rear flange portion 66 in the vehicle width direction.

  Here, the bolt holes 66A formed at both ends of the rear flange portion 66 in the vehicle width direction are front pillar bag bodies when the front pillar bag body portion 32 is inflated and deployed as shown in FIG. It is formed on the outer side in the vehicle width direction from the portion 32. As a result, the gas and gas supplied from the inflator 26 to the airbag bag body 28 and the cowl bag body portion 30 and the front pillar bag body portion 32 are inflated and deployed, and the bolts and nuts inserted into the bolt holes 66A (rear) Without being caught by the side attachment member), it can be inflated and deployed to a target position at a desired timing.

  Further, as shown in FIG. 6, the airbag case 62 of the present embodiment has more fastening portions of the rear flange portion 66 than those of the first embodiment, so that the fastening strength ( (Holding strength) can be improved.

  In the present embodiment, the rear flange portion 66 is formed longer in the vehicle width direction than the storage portion 65. However, the present invention is not limited to this, and the rear flange portion 66 may have another shape. For example, the first rear flange portion is formed at the center of the airbag case 62 in the vehicle width direction, and the rear flange portions are further formed from both ends of the storage portion 65 in the width direction to the vehicle rear side. A total of three rear flange portions may be formed.

<Third Embodiment>
Next, a pedestrian protection airbag device according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably. As shown in FIG. 8, a pedestrian airbag device 70 (hereinafter referred to as “airbag device 70” as appropriate) on which the pedestrian protection airbag device according to this embodiment is mounted is a hood 14 of a vehicle 12. Are fastened and fixed to the hood inner panel 14B.

  The airbag device 70 mainly includes an airbag case 72, an inflator 26, and an airbag bag body 28. The airbag bag body 28 includes a cowl bag body portion 30 and a front pillar bag body portion 32. Furthermore, the airbag case 72 includes a box-shaped storage portion 74, a front flange portion 76, and a rear flange portion 78.

  The storage portion 74 includes an upper surface plate 80 that constitutes the upper surface and a lower surface plate 82 that constitutes the lower surface. Further, the front end portion of the upper surface plate 80 and the front end portion of the lower surface plate 82 are connected by a front plate 84 inclined obliquely downward along the bulging portion 14C of the hood inner panel 14B. The rear end portion and the rear end portion of the lower surface plate 82 are connected by a rear surface plate 86 extending in the vertical direction.

  Here, in the airbag case 72 of the present embodiment, a tear line 88 as a cleavage portion is formed at a site different from the first embodiment. That is, the tear line 88 is formed in a groove shape at the boundary between the upper surface plate 80 and the rear surface plate 86, and is formed continuously or intermittently along the vehicle width direction. Thereby, when the airbag case 72 is torn, the tear line 88 is used as a starting point.

  On the other hand, a groove-like break point 90 is formed at the front end portion of the bottom plate 82 at the same position as in the first embodiment. The folding point 90 is formed shallower than the tear line 88 on the inner wall surface of the lower surface plate 82. Therefore, when the airbag case 72 is cleaved from the tear line 88 as a starting point, the lower surface plate 82 and the rear surface plate 86 between the tear line 88 and the folding point 90 bend downward from the folding point 90 (deformation). To be configured).

  A front flange portion 76 is provided on the vehicle front side from the storage portion 74. The front flange portion 76 is formed to extend forward from the front end portion of the lower surface plate 82 along the bulging portion 14C of the hood inner panel 14B, and a bolt hole 76A is formed in the front flange portion 76. . A plurality of bolt holes 76A are formed along the airbag case 72 at intervals in the vehicle width direction (see FIG. 1). A bolt 50 as a front mounting member is inserted into the bolt hole 76 </ b> A from below and is screwed into the nut 52. Thus, the front end portion of the airbag case 72 is fastened and fixed to the hood inner panel 14B.

  On the other hand, a rear flange portion 78 is provided on the vehicle rear side from the storage portion 74. The rear flange portion 78 is provided at the center of the airbag case 72 in the vehicle width direction, and extends rearward from the rear end portion of the upper surface plate 80 along the hood inner panel 14B. Further, a bolt hole 78A is formed in the central portion in the width direction of the rear flange portion 78, and a bolt 54 as a rear mounting member is inserted into the bolt hole 78A from above and is screwed onto the nut 56. It is stuck. Thus, the rear end portion of the airbag case 72 is fastened and fixed to the hood inner panel 14B.

  Here, a guide portion 92 is provided in the rear flange portion 78. The guide portion 92 is disposed between the fastening portion to which the rear flange portion 78 is fastened and the cowl bag body portion 30. In the present embodiment, as an example, the rear plate 86 of the airbag case 72 is provided. It is arranged on the vehicle rear side. For example, the airbag case 72 may be provided inside the airbag case 72.

  The guide portion 92 projects downward from the rear flange portion 78, and mainly includes an inclined portion 92A inclined downward from the joint portion between the rear plate 86 and the rear flange portion 78 toward the rear side. A top portion 92B extending rearward from the lower end portion of the inclined portion 92A along the rear flange portion 78; and a vertical wall portion 92C connecting the rear end portion of the top portion 92B and the rear flange portion 78. The cross section is formed in a substantially triangular shape. Further, the boundary portion between the inclined portion 92A and the top portion 92B is chamfered to have an arc shape (R shape).

  The inclined portion 92A and the vertical wall portion 92C are formed below the lower end portion of the bolt 54 with respect to the rear flange portion 78, and are configured to cover the bolt 54 and the nut 56 when viewed from the vehicle front side. ing.

  In the airbag device 70 of the present embodiment, when gas is supplied from the inflator 26 to the airbag bag body 28, the airbag case 72 is tiered by the inflation pressure of the airbag bag body 28 as shown in FIG. Cleaved starting at 88. Here, in the present embodiment, since the tear line 88 is formed at the upper end portion of the rear plate 86, the lower plate 82 and the rear plate 86 are bent downward and forward from the folding point 90 as a base point (deformed). ).

  Subsequently, the cowl bag body portion 30 of the airbag bag body 28 contacts the guide portion 92 while being inflated and deployed rearward from the storage portion 74. The cowl bag body portion 30 is inflated and deployed rearward along the inclined portion 92A of the guide portion 92 so as to get over the bolt 54 and the nut 56. Thus, by providing the guide portion 92, the cowl bag body portion 30 may be damaged by contacting the bolt 54 and the nut 56 without covering the bolt 54 and the nut 56 with the rear plate 86 of the airbag case 72. , And can be suppressed.

  As mentioned above, although the pedestrian protection airbag apparatus which concerns on 1st Embodiment-3rd Embodiment of this invention was demonstrated, of course, it can implement in a various aspect in the range which does not deviate from the summary of this invention. For example, in FIG. 1, the rear end portion of the airbag case 24 is fixed at the center in the vehicle width direction by one rear mounting member (bolt 54 and nut 56). If it is a position which does not overlap with locus L at the time of deployment of part 32, it may be fixed using a plurality of rear attachment members. In FIG. 8, a plurality of bolts 54 may be inserted into the rear flange portion 78 and the rear flange portion 78 may be fastened and fixed at a plurality of locations. In this case, if the guide part 92 is arrange | positioned at each fastening part, it can suppress that the bag body part 30 for cowl is damaged or caught.

10, 60, 70 Pedestrian protection air bag device 14 Hood 24, 62, 72 Air bag case 26 Inflator 30 Cowl bag part 32 Front pillar bag part 36, 64, 76 Front flange part (front end of airbag case) Part)
38, 66, 78 Rear flange (rear end of airbag case)
48, 88 tear line
50 bolts (front mounting member)
52 Nut (front mounting member)
54 bolts (rear mounting member)
56 Nut (rear mounting member)
92 Guide part L Trajectory when the front pillar bag part is unfolded

Claims (3)

An airbag case disposed on the lower side of the rear end portion of the hood whose rear end portion can be raised to the vehicle upper side, and extending in the vehicle width direction;
A cowl bag body extending in the vehicle width direction and housed in the airbag case and covering at least a part of the cowl when deployed;
A front pillar bag body portion that is folded from both ends of the cowl bag body portion toward the center side and the vehicle rear side in the vehicle width direction and stored in the airbag case, and covers at least a lower portion of the front pillar when deployed;
An inflator that generates gas to inflate and deploy the cowl bag body portion and the front pillar bag body portion toward the vehicle rear side;
A front attachment member for attaching the front end of the airbag case to the hood;
A rear mounting member that is provided at the center of the airbag case in the vehicle width direction and that attaches the rear end of the airbag case to the hood at a position that does not overlap with the locus of the front pillar bag body when deployed. ,
A pedestrian protection airbag device. The airbag case is a box-shaped member that is cleaved starting from a cleaving portion by the inflation pressure of the cowl bag body portion and the front pillar bag body portion,
2. The pedestrian protection according to claim 1, wherein the cleaving portion is formed at a position where a part of the airbag case is deformed to cover the rear attachment member from the vehicle lower side when the airbag case is cleaved. Airbag device. A guide portion is provided between the rear mounting member and the cowl bag body portion,
2. The pedestrian protection airbag device according to claim 1, wherein the guide portion abuts on the cowl bag body portion that is inflated and deployed so as to get over the rear attachment member on the cowl bag body portion.

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