JP2015134527A - Hood loading structure of pedestrian protection airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a load onto a pedestrian who fell onto a hood.SOLUTION: In a vehicle 10 to which a hood loading structure S of a pedestrian protection airbag device is applied, a bead 42, which extends in a vehicle width direction, is formed on a rear end general part 38 in a rear end 34A of a hood inner panel 34. When a load is inputted to a rear end 30A of a hood 30 from a vehicle upper side, the rear end 30A of the hood 30 is folded to a vehicle lower side at the bead 42 as an original point. Consequently, when, for example, a head of a pedestrian, who fell onto the hood 30 contacts the rear end 30A of the hood 30, the rear end of the hood 30 is folded to the vehicle lower side, whereby an impact load acting on the head of the pedestrian is absorbed. Therefore, a load onto the pedestrian, who fell onto the hood 30, can be reduced.

Description

  The present invention relates to a hood mounting structure for a pedestrian protection airbag device.

  The following Patent Document 1 describes a structure for mounting a hood airbag device (pedestrian protection airbag device) on a hood. Briefly describing this structure, a bulging portion bulging downward from the vehicle is formed at the rear end of the hood inner panel. An air bag case that constitutes the outline of the hood air bag device is disposed on the rear side of the bulging portion, and the air bag and the inflator are accommodated in the air bag case. In addition, as a hood airbag apparatus, there exist some described in the following patent documents 2-patent documents 4. FIG.

JP 2003-89333 A JP 2004-168111 A Japanese Patent Laid-Open No. 2005-178487 JP-A-2005-343202

  By the way, in the hood mounting structure of the hood airbag device, the airbag is inflated and deployed between the rear end portion of the hood and the windshield glass. For this reason, when the head of a pedestrian who has fallen on the hood comes into contact with the rear end of the hood, the reaction force from the hood, the reaction force from the inflated airbag, and the hood airbag device is activated. The resultant force of inertial force acting on a mass body such as an inflator acts on a pedestrian. Thereby, the load with respect to a pedestrian may increase.

  An object of the present invention is to provide the hood mounting structure of the pedestrian protection airbag device which can reduce the load to the pedestrian who fell on the hood in consideration of the above-mentioned fact.

  In the hood mounting structure of the pedestrian protection airbag device according to claim 1, the rear end portion can be raised to the vehicle upper side, and the hood inner panel constituting the power unit chamber side is inflated toward the power unit chamber side. A hood formed with a bulging portion that extends and extends in the vehicle width direction; a rear end portion of the hood that is provided on the vehicle rear side of the bulging portion and is raised to the vehicle upper side; and a windshield glass; A pedestrian protection airbag device having an airbag that is inflated and deployed between the hood inner panel and a rear end of the hood inner panel including the rear wall of the bulging portion, and extending in the vehicle width direction, And a deformation starting point portion that becomes a starting point of folding of the hood when a load from the upper side of the vehicle is input to a rear end portion of the hood that has been raised to the upper side of the vehicle.

  In the hood mounting structure of the pedestrian protection airbag device according to the first aspect, the hood is configured to be able to rise to the vehicle upper side at the rear end portion. Further, a bulging portion is formed on the rear end side of the hood inner panel constituting the power unit chamber side of the hood, and the bulging portion bulges toward the power unit chamber side and extends in the vehicle width direction. ing. Furthermore, a pedestrian protection airbag device is provided on the vehicle rear side of the bulging portion. When the pedestrian protection airbag device is activated, the airbag of the pedestrian protection airbag device is inflated and deployed between the rear end portion of the hood raised to the upper side of the vehicle and the windshield glass.

  Here, a deformation starting point portion extending in the vehicle width direction is formed at the rear end portion of the hood inner panel including the rear wall of the bulging portion. And when the load from the vehicle upper side is input into the rear-end part of a hood, it is comprised so that the rear-end part of a hood may bend | fold from the deformation | transformation starting part. For this reason, for example, when the head of a pedestrian who has fallen on the hood is brought into contact with the rear end of the hood, the rear end of the hood is bent so that a collision load acting on the head of the pedestrian is generated. Absorbed. Therefore, the load on the pedestrian who falls on the hood can be reduced.

  The hood mounting structure of the pedestrian protection airbag device according to claim 2 is the invention according to claim 1, wherein the angle formed by the bottom wall of the bulging portion and the rear wall is set to be an obtuse angle in a side sectional view. Has been.

  In the hood mounting structure of the pedestrian protection airbag device according to claim 2, since the angle formed by the bottom wall and the rear wall of the bulging portion is set to an obtuse angle in a side sectional view, On the other hand, the rear wall of the bulging portion is configured to easily fall down and deform toward the vehicle lower side. For this reason, for example, when the head of a pedestrian who has fallen on the hood comes into contact with the vehicle upper part of the bulge part in the hood, the rear wall of the bulge part is deformed so as to fall down on the vehicle lower side. Thus, the collision load acting on the pedestrian's head is absorbed. Thereby, the load with respect to the pedestrian who fell on the hood in the site | part on the vehicle upper side of the bulging part in a hood can be reduced.

  The hood mounting structure of the pedestrian protection airbag device according to claim 3 is the invention according to claim 1 or claim 2, wherein the deformation starting point portion is a bead raised to the vehicle upper side in a side sectional view, The pedestrian protection airbag device includes an inflator that inflates and deploys the airbag by being actuated, and the inflator is disposed along the vehicle width direction on the vehicle lower side of the bead.

  In the hood mounting structure of the pedestrian protection airbag device according to the third aspect, the deformation starting point portion is a bead raised to the upper side of the vehicle in a side sectional view. In addition, an inflator for inflating and deploying the airbag in the pedestrian protection airbag apparatus is disposed along the vehicle width direction on the vehicle lower side of the bead. In other words, the bead extends in the vehicle width direction on the vehicle upper side of the inflator. For this reason, for example, even when the head of a pedestrian who has fallen on the hood is in contact with the vehicle upper part of the inflator in the hood, the collision that acts on the pedestrian's head due to deformation of the bead. The load is absorbed. Thereby, the load with respect to the pedestrian who fell on the hood in the site | part on the vehicle upper side of the inflator in a hood can be reduced.

  According to the hood mounting structure of the pedestrian protection airbag device according to claim 1, it is possible to reduce a load on the pedestrian who falls on the hood.

  According to the hood mounting structure of the pedestrian protection airbag device according to the second aspect, it is possible to reduce the load on the pedestrian who has fallen onto the hood at the vehicle upper side portion of the bulge portion of the hood.

  According to the hood mounting structure of the pedestrian protection airbag device according to the third aspect, it is possible to reduce the load on the pedestrian who has fallen on the hood at the vehicle upper portion of the inflator in the hood.

It is the sectional side view (1-1 line expanded sectional view of FIG. 2) seen from the vehicle left side which shows the hood rear end part of the vehicle to which the hood mounting structure of the pedestrian protection airbag device according to the present embodiment is applied. . It is the top view seen from the vehicle upper side which shows the front part of the vehicle shown by FIG. It is a sectional side view corresponding to FIG. 1 which shows the state which the airbag of the pedestrian protection airbag apparatus shown by FIG. 1 expand | deployed. (A) is a side sectional view for explaining deformation of the hood when the impactor abuts on the rear end of the hood, and (B) is an impactor on the vehicle upper side of the bulging portion of the hood. It is a sectional side view for demonstrating a deformation | transformation of the hood when it contact | abuts. It is the perspective view seen from the vehicle rear diagonal upper direction which shows another example of the deformation | transformation origin part in this invention. (A) is a side sectional view showing another example of the deformation starting point portion in the present invention, (B) is an impactor abuts the vehicle upper portion of the bulge portion in the hood shown in (A) It is side sectional drawing for demonstrating the deformation | transformation of the hood at the time.

  Hereinafter, the vehicle 10 to which the hood mounting structure S of the pedestrian protection airbag device according to the present embodiment is applied will be described with reference to the drawings. Note that an arrow FR appropriately shown in the drawings indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow RH indicates the right side of the vehicle.

  As shown in FIG. 2, the hood mounting structure S of the pedestrian protection airbag device is applied to the rear end portion of the hood 30 that opens and closes the power unit chamber 12 of the vehicle 10, and the hood 30 and the pedestrian protection airbag. The apparatus 50 is configured as a main part. Hereinafter, the hood 30 will be described first, and then the pedestrian protection airbag device 50 will be described.

(About food 30)
As shown in FIG. 1, the hood 30 includes a hood outer panel 32 that constitutes a design surface of the hood 30, and a hood inner panel 34 that reinforces the hood outer panel 32. The hood outer panel 32 is disposed on the vehicle outer side of the hood 30 (the side opposite to the power unit chamber 12), and the hood inner panel 34 is disposed on the power unit chamber 12 side. And both terminal parts are combined by hemming. Further, as shown in FIG. 2, the hood hinge 14 is provided at the rear end portion 30 </ b> A of the hood 30 at both ends in the vehicle width direction. The hood hinge 14 is fixed to the vehicle body and supports the hood 30 so that it can be opened and closed. When the hood 30 closes the power unit chamber 12, the front end portion of the hood 30 is locked to the vehicle body by a hood lock (not shown).

  Further, the hood hinge 14 constitutes a part of the vehicle pop-up hood device 16. The vehicle pop-up hood device 16 includes an actuator (not shown). The actuator includes a rod that pushes up the hood 30 to the upper side of the vehicle and a cylinder that houses the rod, and a gas generator is housed in the cylinder. And the rod raises the hood 30 to the vehicle upper side by the gas generated by the gas generator, so that the rear end portion 30A of the hood 30 rises to the vehicle upper side. Furthermore, the actuator is electrically connected to an ECU 74 described later, and is configured such that the vehicle pop-up hood device 16 (gas generator) is operated under the control of the ECU 74.

  Further, as shown in FIG. 1, a bulging portion 36 bulging to the vehicle lower side is formed at the rear end portion of the hood inner panel 34. The bulging portion 36 is formed in a substantially U-shaped cross section that extends in the vehicle width direction and is open to the upper side of the vehicle in a side sectional view. Specifically, the bulging portion 36 includes a bottom wall 36A disposed substantially parallel to the hood outer panel 32, a front wall 36B extending from the front end of the bottom wall 36A toward the vehicle diagonally front side, and a rear end of the bottom wall 36A. And a rear wall 36C extending obliquely rearward on the vehicle. That is, the angle θ formed by the bottom wall 36A and the rear wall 36C in the side sectional view is set to an obtuse angle. The rear side portion of the hood inner panel 34 including the rear wall 36C of the bulging portion 36 is a rear end portion 34A of the hood inner panel 34. The rear end portion 34A is the rear wall of the bulging portion 36. 36C and a rear end general portion 38 extending from the upper end of the rear wall 36C to the vehicle rear side. Further, a portion of the hood 30 corresponding to the rear end portion 34 </ b> A in the hood inner panel 34 is a rear end portion 30 </ b> A of the hood 30.

  A plurality of weld nuts 40 are provided on the upper surface of the bottom wall 36A to fix an airbag case 52 to be described later, and the weld nuts 40 are arranged at predetermined intervals in the vehicle width direction. Further, a plurality of insertion holes 36 </ b> Aa are formed through the bottom wall 36 </ b> A, and each insertion hole 36 </ b> Aa is disposed coaxially with the weld nut 40.

  Further, a bead 42 as a “deformation starting point” is formed in the front portion of the rear end general portion 38 of the hood inner panel 34, and the bead 42 extends in the vehicle width direction along the bulging portion 36. Has been. That is, the bead 42 is disposed close to the vehicle rear side with respect to the boundary portion between the rear end general portion 38 and the rear wall 36C. Further, the bead 42 is formed in a substantially inverted U shape that is raised to the upper side of the vehicle and opened to the lower side of the vehicle in a side sectional view. When the rear end 30A of the hood 30 is raised to the upper side of the vehicle by the vehicle pop-up hood device 16, the load from the upper side of the vehicle is input to the rear end 30A of the hood 30. The end 30 </ b> A is configured to bend downward from the vehicle starting from the bead 42.

  Further, a cowl louver 20 is provided on the vehicle lower side of the rear end portion 30 </ b> A of the hood 30 at a position on the vehicle rear side of the bulging portion 36. The cowl louver 20 is bridged between a cowl lower panel 22 disposed on the vehicle lower side of the cowl louver 20 and a lower end portion of a windshield glass 24 disposed on the vehicle rear side of the cowl louver 20, and in the vehicle width direction. Has been extended to. Further, a seal member 26 is provided at the front end portion of the cowl louver 20 at a position below the vehicle of an airbag case 52 described later, and the seal member 26 extends in the vehicle width direction.

(About the pedestrian protection airbag device 50)
The pedestrian protection airbag device 50 includes an airbag case 52, and the airbag case 52 constitutes an outline of the pedestrian protection airbag device 50. The airbag case 52 is made of a resin material, and is formed in a substantially long shape with the vehicle width direction as a longitudinal direction (see FIG. 2). The airbag case 52 includes a case main body 54 that houses an airbag 66 to be described later, and a fixing flange 56 that constitutes a front end portion of the airbag case 52.

  The case main body 54 is formed in a substantially long box shape, and is disposed adjacent to the rear side of the vehicle with respect to the bulging portion 36 of the hood inner panel 34. Specifically, the case main body 54 is disposed substantially parallel to the upper wall 54A disposed along the lower surface of the rear end general portion 38 of the hood inner panel 34 and the rear wall 36C of the bulging portion 36, and the upper wall. A front wall 54B extending from the front end of 54A to the vehicle lower oblique front side, a rear wall 54C extending from the rear end of the upper wall 54A to the vehicle lower side, and a lower end and a rear wall of the front wall 54B disposed substantially parallel to the upper wall 54A And a lower wall 54D connecting the lower end of 54C. The lower surface of the lower wall 54 </ b> D of the case main body 54 is substantially flush with the lower surface of the bottom wall 36 </ b> A of the bulging portion 36. Further, in the state where the hood 30 closes the power unit chamber 12, the above-described seal member 26 is in contact with the vehicle longitudinal direction intermediate portion of the lower wall 54 </ b> D of the case main body 54.

The fixing flange 56 is formed in a plate shape, and extends from the lower part of the front end of the case body 54 to the vehicle front side along the lower surface of the bottom wall 36A of the bulging portion 36. Further, the lower surface of the fixing flange 56 is disposed slightly below the vehicle with respect to the lower wall 54 </ b> D of the case main body 54. A plurality of insertion holes 56A are formed through the fixing flange 56, and each insertion hole 56A is disposed coaxially with the above-described weld nut 40 and the insertion holes 36Aa of the bulging portion 36. The bolt 44 is inserted into the insertion hole 56A and the insertion hole 36Aa, and the bolt 44 is screwed into the weld nut 40, whereby the fixing flange 56 (airbag case 52) is fastened and fixed to the bulging portion 36. Yes.

  Further, a tapered surface 60 is formed on the inner peripheral surface of the corner portion 58 at the upper rear end of the case main body 54, and the tapered surface 60 is inclined to the upper side of the vehicle as it goes to the front side of the vehicle in a side sectional view. ing. That is, the thickness of the corner portion 58 of the case body 54 is set to be thicker than the thickness of the general portion (portion other than the corner portion 58) of the case body 54.

  Further, a V-shaped groove opened to the front side of the vehicle is formed at the lower end of the tapered surface 60 in the corner portion 58 of the case main body 54. Accordingly, a thinned tier portion 64 is formed in the case main body 54, and the tier portion 64 has lower strength and rigidity than the general portion of the case main body 54.

  An airbag 66 is accommodated in the airbag case 52. The airbag 66 is configured in a bag shape by sewing the outer peripheral portions of two base fabrics as an example, and is stored in the airbag case 52 in a state of being folded by bellows fold or roll fold. . When the airbag 66 is inflated and deployed, the airbag 66 extends in the vehicle width direction between the rear end 30A of the hood 30 and the lower end of the windshield glass 24 (see FIG. 3). The front end of the front pillar 28 is covered at both ends in the longitudinal direction (see the airbag 66 indicated by a two-dot chain line in FIG. 2).

  Specifically, as shown in FIG. 2, the airbag 66 communicates with the bag main body 68 extending in the vehicle width direction along the rear end 30 </ b> A of the hood 30 and the bag main body 68. And a pair of bag side portions 70 covering the front surfaces of the pair of left and right front pillars 28. Further, as shown in FIG. 3, the bag main body 68 includes a bag base 68A that expands in the vehicle width direction along the lower surface of the rear end 30A of the hood 30, a rear end 30A of the hood 30, and a windshield glass. A bag cylindrical portion 68B that is inflated and deployed in a cylindrical shape from between 24 and covers the front surface of the lower end portion of the windshield glass 24.

  Further, as shown in FIG. 2, a pair of inflators 72 are disposed in the airbag case 52. As shown in FIG. 1, the inflator 72 is disposed at a position below the vehicle with respect to the bead 42 of the hood inner panel 34 described above. Further, the inflator 72 is made of metal and is formed in a cylindrical shape whose both ends in the axial direction are closed, and is fixed to the bulging portion 36 of the hood inner panel 34 via a mounting bracket (not shown). When the inflator 72 is actuated, the gas generated by the inflator 72 is supplied into the airbag 66, and the airbag 66 is inflated and deployed.

  The inflator 72 is electrically connected to the ECU 74 of the vehicle 10, and the ECU 74 is electrically connected to a collision detection sensor (not shown) and a collision prediction sensor (not shown). As a collision detection sensor, for example, a chamber system composed of a chamber and a pressure sensor extending along the vehicle width direction on the back surface side of the front bumper, and extending along the vehicle width direction on the back surface side of the front bumper. A pressure tube system configured with a pressure tube and a pressure sensor, an optical fiber system configured with an optical fiber sensor extended along the vehicle width direction on the back surface side of the front bumper, and the like are applicable. As the collision detection 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. The inflator 72 is configured to operate under the control of the ECU 74 when the ECU 74 detects a frontal collision of the vehicle or a prediction of a frontal collision of the vehicle based on signals output from the collision sensor and the collision prediction sensor to the ECU 74. Has been.

  Next, the operation and effect of the present embodiment will be described.

  In the vehicle 10 to which the hood mounting structure S of the pedestrian protection airbag device configured as described above is applied, a bulge portion that is bulged to the vehicle lower side on the rear end side of the hood inner panel 34 of the hood 30. 36 is formed. A pedestrian protection airbag device 50 is provided adjacent to the rear side of the bulging portion 36 in the vehicle.

  When the vehicle 10 collides with a colliding body such as a pedestrian or the like, the collision detection sensor detects that the colliding body collided with the colliding body and outputs a collision signal to the ECU 74. The ECU 74 determines whether or not the vehicle pop-up hood device 16 should be operated based on the input collision signal, and if it is determined that the vehicle pop-up hood device 16 should be operated, the actuator of the vehicle pop-up hood device 16 An operation signal is output at As a result, the gas generator of the actuator operates to supply gas into the cylinder. As a result, the rod of the vehicle pop-up hood device 16 pushes the hood 30 upward, and the rear end 30A of the hood 30 is raised upward of the vehicle relative to the lower ends of the cowl louver 20 and the windshield glass 24.

  Further, when the rear end 30A of the hood 30 is raised to the vehicle upper side by the vehicle pop-up hood device 16, the inflator 72 of the pedestrian protection airbag device 50 is operated by the control of the ECU 74. When the inflator 72 is activated, the gas generated by the inflator 72 is supplied into the airbag 66, and the airbag 66 is inflated and deployed. When the airbag 66 is inflated and deployed, the airbag case 52 is broken at the portion of the tier portion 64, and the airbag 66 is inflated and deployed toward the vehicle rear side with respect to the airbag case 52. Furthermore, the bag body portion 68 of the inflated and deployed airbag 66 extends in the vehicle width direction between the rear end portion 30A of the hood 30 and the windshield glass 24, and the bag side portion 70 of the airbag 66 is The front pillar 28 of the vehicle 10 is covered from the vehicle front side. Thereby, the protection performance with respect to the pedestrian etc. who fell on the food | hood 30 can be improved.

  Here, a bead 42 extending in the vehicle width direction is formed in the front portion of the rear end general portion 38 in the rear end portion 34A of the hood inner panel 34. When a load from the upper side of the vehicle is input to the rear end portion 30 </ b> A of the hood 30, the rear end portion 30 </ b> A of the hood 30 is bent downward from the bead 42. For this reason, for example, when the head of a pedestrian who has fallen on the hood 30 comes into contact with the rear end portion 30A of the hood 30, the rear end portion 30A of the hood 30 is bent so that the pedestrian's head is bent. The acting collision load is absorbed. Therefore, the load on the pedestrian who falls on the hood 30 can be reduced.

  This point will be described with reference to FIGS. 3 and 4A. In FIG. 3, the impactor I corresponding to the pedestrian's head is shown in the hood with the airbag 66 inflated and deployed between the rear end 30A of the hood 30 raised to the upper side of the vehicle and the windshield glass 24. 30 shows the force acting on the impactor I when it is in contact with the rear end portion 30A of the rear end 30A. That is, the impactor I acts on a reaction force F1 from the hood 30, a reaction force F2 from the inflated and deployed airbag 66, and a mass such as the inflator 72 when the pedestrian protection airbag device 50 is activated. The resultant force of inertial force F3 acts. For this reason, in the vehicle 10 in which the airbag 66 is inflated and deployed between the rear end 30A of the hood 30 and the lower end of the windshield glass 24 as in the present embodiment, the load on the impactor I increases. there is a possibility.

  On the other hand, in this embodiment, as described above, the bead 42 extending in the vehicle width direction is formed in the rear end general portion 38 of the rear end portion 34A of the hood inner panel 34. For this reason, as shown in FIG. 4A, when the impactor I contacts the rear end 30A of the hood 30, the hood outer panel 32 is deformed to the lower side of the vehicle and hits the hood inner panel 34. The rear end portion 30A is deformed so as to bend downward from the vehicle starting from the bead 42. As a result, the rear end portion 30A of the hood 30 is bent, so that the collision load acting on the impactor I is absorbed. As a result, the HIC value (head injury reference value) can be reduced, and the head protection performance against a pedestrian who falls on the hood 30 can be improved. As described above, the load on the pedestrian who falls on the hood 30 at the rear end 30A of the hood 30 can be reduced.

  Furthermore, in the bulging part 36 formed in the hood inner panel 34, the angle θ formed by the bottom wall 36A and the rear wall 36C of the bulging part 36 is set to an obtuse angle in a side sectional view. For this reason, the rear wall 36C is configured to easily fall down and deform with respect to the load from the upper side of the vehicle. As a result, as shown in FIG. 4B, when the impactor I comes into contact with the vehicle upper portion of the bulging portion 36 in the hood 30, the hood outer panel 32 is deformed to the vehicle lower side, The rear wall 36C of the bulging portion 36 of the hood inner panel 34 is deformed so as to fall down to the vehicle rear side and the vehicle lower side (arrow A direction side in FIG. 4B). Thereby, the collision load acting on the impactor I is absorbed. Therefore, it is possible to reduce a load on a pedestrian who has fallen on the hood 30 at a portion of the hood 30 on the vehicle upper side of the bulging portion 36.

  Further, the bead 42 is formed in a substantially inverted U shape that is raised to the upper side of the vehicle and opened to the lower side of the vehicle in a side sectional view, and is disposed on the upper side of the inflator 72. For this reason, when the impactor I is brought into contact with the vehicle upper portion of the inflator 72 in the rear end portion 30A of the hood 30, the bead 42 is deformed and the collision load acting on the impactor I is absorbed. Thereby, even when the head of the pedestrian who has fallen on the hood 30 comes into contact with the portion of the hood 30 on the vehicle upper side of the inflator 72, the bead 42 is deformed to act on the pedestrian's head. The impact load can be absorbed. Thereby, the load with respect to the pedestrian who fell on the hood 30 in the site | part on the vehicle upper side of the inflator 72 in the hood 30 can be reduced.

  In the present embodiment, when a load from the upper side of the vehicle is input to the rear end 30A of the hood 30, the rear end 30A of the hood 30 moves downward from the bead 42 of the hood inner panel 34. Although it is comprised so that it may bend, the deformation | transformation origin part used as the starting point of the bending of the food | hood 30 is not restricted to this. For example, as shown in FIG. 5, a plurality of elongated holes 80 having a longitudinal direction in the vehicle width direction are formed in the rear end general portion 38 of the hood inner panel 34 and are formed intermittently in the vehicle width direction. The part 82 may be a deformation starting point part of the present invention. That is, “the deformation starting point portion extends in the vehicle width direction” in the present invention includes a case where the weakened portion 82 as shown in FIG. 5 extends intermittently in the vehicle width direction. Since the fragile portion 82 has lower strength and rigidity than the rear end general portion 38 of the hood inner panel 34, when a load from the vehicle upper side is input to the rear end portion 30 </ b> A of the hood 30, The end portion 30A bends downward from the vehicle starting from the fragile portion 82.

  Moreover, in this Embodiment, although the cross-sectional shape of the bead 42 is formed in the substantially reverse U shape open | released to the vehicle lower side, the cross-sectional shape of the bead 42 is not restricted to this. For example, the cross-sectional shape of the bead 42 may be formed in a substantially semicircular shape opened to the vehicle lower side, or may be formed in a substantially inverted V-shape opened to the vehicle lower side.

  Furthermore, in this embodiment, the bead 42 is formed at the front portion of the rear end general portion 38 of the hood inner panel 34, but the bead 42 may be formed on the rear wall 36 </ b> C of the bulging portion 36. Also in this case, the cross-sectional shape of the bead 42 may be arbitrarily set as described above. For example, as shown in FIG. 6 (A), a stepped portion 84 may be formed at an intermediate portion in the inclination direction of the rear wall 36C, and the stepped portion 84 may be used as a deformation starting point portion in the present invention. That is, when the impactor I is brought into contact with the rear end portion 30A of the hood 30 from the upper side of the vehicle, the rear end portion 30A of the hood 30 is bent toward the lower side of the vehicle starting from the stepped portion 84. In addition, as shown in FIG. 6B, when the impactor I is in contact with the vehicle upper portion of the bulging portion 36 in the hood 30, the stepped portion 84 extends substantially linearly in a side sectional view. In this way, the collision load on the impactor I may be absorbed by the deformation in the stepped portion 84.

12 power unit chamber 24 windshield glass 30 hood 30A rear end 34 of hood inner panel 34A rear end 36 of hood inner panel 36 bulging part 36A bottom wall 36C bulging part rear wall 42 bead (deformation origin) Part)
50 Pedestrian Protection Airbag Device 66 Airbag 72 Inflator 82 Fragile Portion (Deformation Origin Portion)
84 Step (deformation origin)
S Pedestrian protection airbag device hood mounting structure θ Angle formed between bottom wall and rear wall of bulge

Claims (3)

The rear end portion can be raised to the upper side of the vehicle, and a bulge portion is formed which bulges to the power unit chamber side and extends in the vehicle width direction on the rear end side of the hood inner panel constituting the power unit chamber side. Food and
A pedestrian protection airbag device having an airbag that is provided on the vehicle rear side of the bulging portion and is inflated and deployed between a rear end portion of the hood raised to the vehicle upper side and a windshield glass;
A load from the vehicle upper side is applied to the rear end portion of the hood that is formed at the rear end portion of the hood inner panel including the rear wall of the bulging portion, extends in the vehicle width direction, and is raised to the vehicle upper side. A deformation starting point that becomes the starting point of the hood when input,
Pedestrian protection airbag device hood mounting structure with   The hood mounting structure for a pedestrian protection airbag device according to claim 1, wherein an angle formed by a bottom wall of the bulging portion and the rear wall is set to an obtuse angle in a side sectional view. The deformation starting point portion is a bead raised to the vehicle upper side in a side sectional view,
The pedestrian protection airbag device includes an inflator that inflates and deploys the airbag by being actuated, and the inflator is disposed along a vehicle width direction on a vehicle lower side of the bead. The hood mounting structure of the pedestrian protection airbag apparatus of Claim 1 or Claim 2.

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