JP4656031B2 - Drainage structure for vehicle and drainage structure of vehicle hood airbag device using the same - Google Patents

Description

  The present invention relates to a drainage structure for a vehicle and a drainage structure for a hood airbag device for a vehicle using the same.

Although the following Patent Document 1 is not related to a vehicle hood airbag device, a grommet is attached to a through hole formed in a dash panel, and a wire harness is passed through an insertion hole formed in an axial core portion of the grommet. Thus, a technique is disclosed in which a wire harness is routed between an engine room and a cabin. Furthermore, in this technology, in order to prevent water from entering from the wire harness portion routed to the engine room side and entering the cabin through the gap between the wires, the grommet insertion hole The shape is U-shaped, and there is a branch passage for drainage that communicates the bottom of the U-shaped insertion hole and the engine room. When water passes through the grommet, To be drained.
Japanese Utility Model Publication No. 6-43953

  The above prior art also seems to be meaningful as a waterproof structure. However, if this prior art is applied to a box-like case such as an air bag case of a vehicle hood air bag device, it is sufficient. There is a problem that the drainage effect cannot be obtained and the cost becomes disadvantageous.

  That is, since water accumulates at the bottom of the box-shaped case, the grommet is attached as close to the bottom surface of the case as possible, but the fitting allowance for fitting the grommet to the side wall portion of the case is reduced. Since it must be secured around, a through hole must be formed slightly above the bottom surface of the case. Then, the water accumulated in the range from the bottom surface of the case to the lower edge of the insertion hole cannot be drained. Therefore, the prior art has room for improvement in this respect.

  Moreover, in order to form a through-hole in the side wall part of a box-shaped case, the structure of the metal mold for manufacturing a case becomes complicated. Therefore, there is a disadvantage that the mold cost increases.

  In view of the above facts, the present invention considers the above facts and, when a wire harness is passed through a box-shaped case using a grommet, a drainage structure for a vehicle that can enhance drainage performance by a low-cost method and a hood airbag for a vehicle using the drainage structure The purpose is to obtain the drainage structure of the device.

  The drainage structure for a vehicle according to the invention of claim 1 is formed in a box-like case installed at a position where there is a possibility of being flooded outside the vehicle compartment of the vehicle, and an arbitrary side wall portion of the case. A recess opened from the upper edge of the case to the bottom surface of the case, and a through-hole for insertion of the wire harness that is attached to the recess and is drained between the bottom surface of the case when mounted in the recess. And a grommet that forms a path.

  The invention of claim 2 is a gas generating means for generating gas at the time of a collision with a collision body, an airbag that is inflated by being supplied with the gas generated from the gas generating means and is deployed on the hood, A drainage structure applied to a vehicle hood airbag device, comprising a box-shaped airbag case that is disposed on a lower surface side of a hood and accommodates a gas generating means and a folded airbag. A recess formed in the side wall portion of the airbag and extending from the upper edge of the side wall portion to the bottom surface of the airbag case, and a through-hole for inserting the wire harness are provided in the recess, and the recess is mounted. In such a state, a grommet that forms a drainage channel with the bottom surface of the airbag case is provided.

  According to a third aspect of the present invention, in the drainage structure for a vehicle hood airbag device according to the second aspect, the concave portion is formed in a substantially V shape and includes a pair of inclined portions. A groove to be inserted into the pair of inclined portions is formed.

  According to a fourth aspect of the present invention, in the drainage structure of the hood airbag device for a vehicle according to the second or third aspect, the bottom surface of the airbag case is located at a position separated from the grommet in the direction of drainage of the drainage channel. A vertical wall hanging downward is provided.

  According to a fifth aspect of the present invention, in the drainage structure for a vehicle hood airbag device according to any one of the second to fourth aspects, the cowl louver is connected to the engine room below the bottom wall portion of the airbag case. A seal member is provided that is attached to the cowl louver extension portion that extends to the side and seals between the bottom surface of the bottom wall portion of the airbag case. A lip portion that is positioned on the outlet side of the drainage channel and prevents the inflow of water to the seal member side is provided.

  According to a sixth aspect of the present invention, in the drainage structure for a vehicle hood airbag device according to the fifth aspect, the cowl louver has an end in contact with the lip portion to prevent water from flowing into the seal member together with the lip portion. A water blocking wall is formed.

  According to the first aspect of the present invention, a concave portion opened from an upper edge of the case to the bottom surface of the case is formed on an arbitrary side wall portion of the case, and a through hole for inserting a wire harness is formed in the concave portion. The provided grommet is installed. In the state after mounting, a drainage channel is formed between the bottom surface of the case and the grommet. Therefore, when the box-shaped case is installed in a position where there is a possibility of being flooded outside the vehicle compartment of the vehicle and water enters the case, the water flowing into the bottom surface of the case is drained from the drainage channel. . As a result, water does not accumulate in the case.

  Further, in the present invention, since the through-hole for attaching the grommet is not formed in the side wall portion of the box-shaped case, a recess opened from the upper edge of the side wall portion to the bottom surface of the case is formed. The mold structure for manufacturing the case is not complicated.

  According to the second aspect of the present invention, gas is generated by the gas generating means when colliding with a collision object such as a pedestrian. The generated gas is supplied into the airbag housed in the airbag case in a folded state, and inflates the airbag. Thereby, the airbag is inflated and deployed on the hood. As a result, a collision body such as a pedestrian is received by the inflated and deployed airbag, and the collision energy at the time of the collision is absorbed, so that the reaction force received by the collision body such as a pedestrian from the vehicle body can be reduced.

  Here, in this invention, the recessed part opened from the upper edge to the bottom face of the airbag case was formed in the side wall part of the airbag case, and the said recessed part was equipped with the through-hole for wire harness insertion Grommets are installed. In the state after mounting, a drainage channel is formed between the bottom surface of the airbag case and the grommet. Therefore, when water enters the airbag case as a result of the box-shaped airbag case being arranged on the lower surface side of the hood, the water flowing into the bottom surface of the airbag case is drained from the drainage channel. As a result, water does not collect in the airbag case.

  Further, in the present invention, a through hole for attaching a grommet is not formed in the side wall portion of the box-shaped airbag case, but a recess opened from the upper edge of the side wall portion to the bottom surface of the airbag case is formed. Since it is a structure, the metal mold | die structure for manufacturing an airbag case does not become complicated.

  According to the third aspect of the present invention, the concave portion is formed in a substantially V shape and includes a pair of inclined portions, and the grommet is formed with grooves inserted into the pair of inclined portions. By changing the inclination angle of the inclined portion and the groove of the grommet, the mounting height of the grommet with respect to the concave portion of the side wall portion of the airbag case can be changed. When the mounting height of the grommet is changed, the depth and width of the drainage channel formed between the grommet and the bottom surface of the airbag case are changed, so that the amount of drainage can be controlled.

  According to the fourth aspect of the present invention, since the grommet is provided with the vertical wall that hangs downward from the bottom surface of the airbag case at a position spaced apart on the drainage direction side of the drainage channel, it is suitable for raining, car washing, etc. In addition, it is possible to avoid the water accumulated in the cowl louver from directly hitting the drainage passage on the airbag case side.

  According to the fifth aspect of the present invention, the cowl louver extending portion is extended from the cowl louver to the engine room side, and the sealing member is disposed in the cowl louver extending portion. This seal member seals between the cowl louver and the lower surface of the bottom wall portion of the airbag case, and prevents water from entering the engine room.

  Here, in the present invention, the grommet is provided with a lip portion that is positioned closer to the outlet side of the drainage channel than the seal member and prevents the inflow of water to the seal member side. However, it is waterproof at the lip portion and has the effect of preventing water from entering the seal member side and thus the engine room side.

  According to the sixth aspect of the present invention, the cowl louver is formed with a water stop wall that is in contact with the lip portion of the grommet and prevents the inflow of water to the seal member together with the lip portion. The installation range of the waterproof wall consisting of the wall becomes longer.

  As described above, the drainage structure for a vehicle according to the first aspect of the present invention is superior in that drainage performance can be improved by a low-cost method when a wire harness is passed through a box-like case using a grommet. It has the effect.

  The drainage structure of the vehicle hood airbag device according to the second aspect of the present invention can improve drainage performance by a low-cost method when a grommet is used to pass a wire harness through a box-shaped airbag case. Has an excellent effect.

  The drainage structure of the vehicle hood airbag device according to the third aspect of the present invention has an excellent effect that the drainage performance can be easily tuned.

  The drainage structure of the vehicle hood airbag device according to the present invention described in claim 4 has an excellent effect that the drainage performance can be further enhanced.

  The drainage structure of the hood airbag device for a vehicle according to the fifth aspect of the present invention can be provided with a water stop wall in the triple (vertical wall, lip portion, seal member), and can greatly enhance drainage performance. It has an excellent effect.

  The drainage structure of the vehicle hood airbag device according to the present invention described in claim 6 has an excellent effect that the waterproof effect of the lip portion can be further enhanced.

  Hereinafter, an embodiment of a seal structure of a vehicle hood airbag device according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 is a longitudinal cross-sectional view (cross-sectional view taken along line 1-1 of FIG. 4) of a state in which the vehicle hood airbag device 10 in an assembled state is cut along the vehicle front-rear direction. Yes. FIG. 2 is a longitudinal sectional view (sectional view taken along line 2-2 in FIG. 4) of the vehicle hood airbag device 10 as viewed from the side when the vehicle hood airbag device 10 is cut at a position different from that in FIG. . FIG. 3 is a perspective view of a vehicle 12 on which the vehicle hood airbag device 10 according to the present embodiment is mounted. FIG. 4 is an enlarged perspective view of the main part of the vehicle hood airbag device 10 according to the present embodiment. FIG. 5 is an exploded view of the main part of the vehicle hood airbag device 10. A perspective view is shown.

  As shown in FIGS. 1 to 3, the vehicle hood airbag device 10 is disposed along the vehicle width direction on the rear end side of the hood 14 that opens and closes the engine room 13 of the vehicle 12. The hood 14 constitutes a hood outer plate and a hood outer panel 16 constituting a design surface of the hood 14, and is arranged at a position spaced apart from the hood outer panel 16 by a predetermined distance to the vehicle lower side to constitute a hood inner plate. The hood inner panel 20 is configured to be included.

  On the rear end side of the hood outer panel 16, a bag bulge opening 18 that is long along the hood width direction (vehicle width direction) is formed. The bag bulge opening 18 is formed in a substantially rectangular shape in plan view. Correspondingly, as shown in FIG. 1, the assembly opening having the same shape as the bag bulging opening 18 is located at the position facing the bag bulging opening 18 in the hood inner panel 20. The hood inner side opening part 26 which is a part is formed.

  As shown in FIGS. 1 and 2, an airbag module 22 is disposed below the bag inflation opening 18. The airbag module 22 includes an airbag case 30 having a vertically divided structure. As shown in FIGS. 4 and 5, the airbag case lower 32 constituting the lower side of the airbag case 30 is formed in a box shape, and a bottom wall portion 32 </ b> A long along the vehicle width direction, The four side wall portions 32B are provided upright from the peripheral edge portion of the bottom wall portion 32A, and the flange portion 32C is formed on the upper peripheral edge portion of these side wall portions 32B. On the other hand, the airbag case upper 34 constituting the upper side of the airbag case 30 is formed in a substantially cylindrical shape, and has four sidewall portions 34A that are vertically connected to the four sidewall portions 32B of the airbag case lower 32. And a flange portion 34B formed at the lower peripheral edge of these side wall portions 34A.

  The flange portion 34B of the airbag case upper 34 is placed on the flange portion 32C of the airbag case lower 32, and bolts (not shown) are inserted into bolt insertion holes 36 (see FIGS. 4 and 5) formed at the four corners. The air bag case 30 is integrally fixed to the hood inner panel 20 by being tightened with a nut. A sealing material 27 such as sponge is interposed between the flange portion 34B of the airbag case upper 34 and the peripheral portion of the hood inner side opening 26 of the hood inner panel 20. In the state where the airbag case 30 is assembled to the hood inner panel 20, the airbag case upper 34 is positioned above the hood inner side opening 26, and the airbag case lower 32 is connected to the hood inner side opening 26. Located on the lower side.

  In the airbag case 30 described above, an inflator 58 as a gas generating means formed in a substantially cylindrical shape is disposed with the vehicle width direction as a longitudinal direction, and an airbag 60 folded according to a predetermined folding method is provided. Contained.

  As the inflator 58, either a mechanical ignition type or an electric ignition type may be used, and either a gas generating agent enclosure type or a high pressure gas enclosure type can be applied. A plurality of gas ejection holes are formed in the circumferential direction of the inflator 58 at predetermined positions on the peripheral wall portion of the inflator 58.

  For example, as shown in FIG. 3, the airbag 60 includes a main body portion 60 </ b> A composed of a plurality of cylindrical cells and flattened along the vehicle width direction, and communicates with both sides of the main body portion 60 </ b> A. And a pair of left and right extension portions 60B extended to the front pillar 66 side. When the airbag 60 is inflated and deployed, the rear end portion 14A and the cowl (and the lower end portion of the windshield glass 64) of the hood 14 are covered by the main body portion 60A, and the lower portion of the front pillar 66 is covered by the left and right extension portions. It has come to be.

  On the other hand, as shown in FIGS. 1 and 2, the open side end portion 28 that is the upper open portion of the airbag case 30, that is, the bag inflation opening 18 can be opened by the airbag door 48 that is a cover. Is blocked. Specifically, the bag inflating opening 18 is formed in a step shape that is stepped downward from the general surface 16A of the hood outer panel 16 to the vehicle lower side, and the airbag door 48 has a thickness that can be accommodated in the step 50. And is formed in a size. A deployment hinge portion (not shown) is integrally formed at the rear end portion of the airbag door 48, and is fixed to a side wall portion 34A on the rear end side of the airbag case upper 34 with bolts and nuts (not shown). Therefore, the airbag door 46 is configured to be deployed toward the rear side of the hood while plastically deforming the deployment hinge portion around the fastening point of the deployment hinge portion.

  Here, the drainage structure of the vehicle hood airbag device 10 described above will be described in detail.

  As shown in FIG. 5, a concave portion 38 formed in a substantially V shape is integrally formed at a predetermined position of the side wall portion 32 </ b> B on the rear end side of the airbag case lower 32 described above. The concave portion 38 is formed by drawing, and includes a pair of inclined portions 38A that are inclined downward from the flange portion 32C, and a bottom surface portion 38B that connects the lower edges of these inclined portions 38A. The bottom 38B of the recess 38 is flush with the bottom 32A 'of the airbag case lower 32 and is flush with the bottom.

  A grommet 40 made of an elastic material (for example, rubber) is inserted into and fitted into the recess 38 from the vehicle rear side. As shown in FIG. 6, the grommet 40 includes a main body portion 40 </ b> A formed in an isosceles trapezoidal shape that can be fitted into the recess 38 and upside down, and a lower portion of the main body portion 40 </ b> A so as to cover the lower portion of the main body portion 40 </ b> A. And a frame portion 40B integrally formed on the outer peripheral portion. A pair of left and right groove portions 42 having substantially the same thickness as the thickness of the airbag case lower 32 are formed between both side portions of the main body portion 40A and the frame portion 40B, and a recess 38 is formed in the pair of left and right groove portions 42. The grommet 40 is fitted in the recess 38 by inserting the pair of right and left inclined portions 38A. As shown in FIG. 1, in a state where the grommet 40 is fitted in the recess 38, the bottom 40 </ b> A ′ (see FIGS. 1 and 6) of the main body 40 </ b> A of the grommet 40 and the bottom 38 </ b> B of the recess 38. A predetermined gap is formed, and this gap is used as the drainage channel 44 (see FIG. 1).

  A through hole 46 is formed in the main body portion 40A and the frame portion 40B of the grommet 40 so as to penetrate them in the thickness direction. A wire harness 47 connected to the inflator 58 is inserted into and supported by the through hole 46. Note that the grommet 40 supports the wire harness 47 in this way in order to prevent the wire harness 47 from being damaged by the edge of the flange portion 32C of the airbag case lower 32, and at the time of rainfall and car wash. This is to prevent water flowing into a cowl louver 56 (described later) from flowing into the airbag case lower 32 from the recess 38 of the airbag case lower 32.

  Further, an overhanging portion 52 is integrally formed on the lower rear end side of the frame portion 40B so as to protrude like a hook toward the vehicle rear side. The vertical wall 52 </ b> A located at the rear end of the overhanging portion 52 is suspended at a position that closes the drainage channel 44 described above. That is, the lower end portion of the vertical wall 52A is located below the bottom surface portion 38B of the recess 38.

  Further, a lip portion 54 that is slightly larger than the frame portion 40B is integrally formed on the lower side of the frame portion 40B. The lip portion 54 has a U-shaped cross section (see FIG. 1), and has substantially the same longitudinal dimension as the main body portion 40A. In the assembled state, the lip portion 54 is disposed between the seal member 67 attached to the front end portion of the cowl louver extending portion 56A extending from the cowl louver 56 to the lower side of the airbag case lower 32 and the vertical wall portion 52A. ing. In addition, as shown in FIG. 2, in a portion where the grommet 40 is not provided, a convex portion 68 protruding upward in the vehicle is formed in the middle portion of the cowl louver extending portion 56 </ b> A of the cowl louver 56. Is arranged continuously in the vehicle width direction adjacent to the lip portion 54 of the grommet 40.

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

  When the vehicle 12 collides with a colliding body such as a pedestrian or the like, the inflator 58 is activated and gas is ejected from the plurality of gas ejection holes. For this reason, the airbag 60 stored in a folded state in the airbag case 30 is inflated and presses the airbag door 48 from the lower surface side. When the bag inflation pressure acting on the airbag door 48 reaches a predetermined value, the airbag door 48 is deployed to the hood outward side (windshield glass 64 side) with the deployment hinge portion as the center. As a result, the bag inflating opening 18 formed on the rear end side of the hood is opened, and the airbag 60 is inflated and deployed so as to be substantially U-shaped in a plan view of the vehicle as shown in FIG. The As a result, when the collision body such as a pedestrian is received from the upper side of the hood on the main body 60A or the extension 60B of the inflated airbag 60, the collision energy at the time of the frontal collision is absorbed and the collision of the pedestrian or the like. The reaction force that the body receives from the body can be lowered.

  Here, in the present embodiment, a substantially V-shaped opening is formed in the side wall 32B on the rear end side of the airbag case lower 32 from the flange portion 32C located at the upper edge to the bottom surface 32A ′ of the airbag case lower 32. A concave portion 38 is formed, and a grommet 40 having a through hole 46 for inserting a wire harness is attached to the concave portion 38. In the state after the mounting, a drainage channel 44 is formed between the bottom surface 32 </ b> A ′ of the airbag case lower 32 and the grommet 40. Therefore, when water enters the airbag case lower 32 as a result of the box-shaped airbag case 30 being arranged on the lower surface side of the hood 14, the drainage passage 44 is formed from the bottom surface 32 </ b> A ′ of the airbag case lower 32. It is drained through as shown by arrow A in FIG. As a result, water does not collect in the airbag case 30.

  In the present embodiment, instead of forming a through hole for attaching a grommet in the side wall portion 32B of the box-shaped airbag case lower 32, the bottom surface of the airbag case 30 is formed from the flange portion 32C at the upper edge of the side wall portion 32B. Since it is the structure which forms the recessed part 38 opened over 32A 'by drawing, the metal mold | die structure for manufacturing the airbag case 30 does not become complicated.

  As described above, according to the present embodiment, when the wire harness 47 is passed through the box-shaped airbag case 30 using the grommet 40, the drainage performance can be enhanced by a low cost method.

  Further, in this embodiment, the recess 38 is formed in a substantially V shape and includes a pair of inclined portions 38A, and the grommet 40 is formed with a groove portion 42 that is inserted into the pair of inclined portions 38A. By changing the inclination angle of the pair of inclined portions 38A and the groove portion 42 of the grommet 40, the mounting height of the grommet 40 with respect to the concave portion 38 of the side wall portion 32B of the airbag case lower 32 can be changed. When the mounting height of the grommet 40 is changed, the depth and width of the drainage channel 44 formed between the grommet 40 and the bottom surface 32A ′ of the airbag case lower 32 change, so that the amount of drainage can be controlled. . As a result, according to this embodiment, the drainage performance can be easily tuned.

  Further, in the present embodiment, the vertical wall 52A that hangs downward from the bottom surface 32A ′ of the airbag case lower 32 (the bottom surface portion 38B of the recess 38) at a position spaced apart from the grommet 40 toward the drainage direction of the drainage channel 44. Therefore, it is possible to avoid the water accumulated in the cowl louver 56 from hitting the drainage channel 44 on the airbag case lower 32 side during rain or car washing. As a result, according to the present embodiment, the drainage performance can be further enhanced.

  In the present embodiment, a cowl louver extending portion 56A extends from the cowl louver 56 toward the engine room 13, and a seal member 67 is disposed on the cowl louver extending portion 56A. The seal member 67 seals between the cowl louver 56 and the lower surface of the bottom wall portion 32A of the airbag case lower 32, thereby preventing water from entering the engine room 13 side.

  Here, on the premise of the above, in the present embodiment, the grommet 40 is provided with a lip portion 54 that is positioned on the outlet side of the drainage channel 44 relative to the seal member 67 and prevents the inflow of water to the seal member 67 side. Therefore, even if the water exceeds the vertical wall 52A of the grommet 40 (even if the water blocked by the vertical wall 52A flows to the seal member 67 side), the water is waterproofed by the lip portion 54 and the seal member 67 side. Can prevent water intrusion into. As a result, according to the present embodiment, the water blocking wall can be provided in the triple (vertical wall 52A, lip portion 54, seal member 67), and the drainage performance can be significantly improved. In other words, it is possible to more effectively suppress or prevent water from entering the engine room 13 side.

  Further, in the present embodiment, the cowl louver 56 is formed with a convex portion 68 as a water stop wall that is in contact with the lip portion 54 of the grommet 40 and prevents the inflow of water into the seal member 67 together with the lip portion 54. The installation range of the waterproof wall composed of the lip portion 54 and the water blocking wall becomes longer. As a result, according to the present embodiment, the waterproof effect of the lip portion 54 can be further enhanced.

[Supplementary explanation of this embodiment]
In the present embodiment described above, when the airbag 60 is inflated and deployed, it covers not only the rear end portion 14A and the cowl of the hood 14 but also the lower portions of the left and right front pillars 66 (the lower end portion of the windshield glass 64). However, what is necessary is just the structure which covers 14 A (rear end part of the hood outer panel 16) and the cowl of the hood 14 at least.

  Further, in the present embodiment described above, the lip portion 54 is formed integrally with the grommet 40. However, the lip portion 54 is disposed at the position where the lip portion 54 is disposed in relation to the layout of auxiliary equipment disposed in the engine room. 7 can be secured to some extent, as shown in FIG. 7, without providing the lip portion 54, a convex portion 72 that protrudes upward in the vehicle is integrally formed in the middle portion of the cowl louver extending portion 70 </ b> A of the cowl louver 70. It may be formed.

  Further, in the above-described embodiment, the airbag case 30 is configured by the airbag case upper 34 and the airbag case lower 32. However, the present invention is not limited to this, and for a box-shaped airbag case that is not divided vertically. The present invention may be applied. In that case, it is arbitrary whether the box-shaped airbag case is configured by one component or a combination of a plurality of components, and both cases are included in the concept of the “airbag case” of the present invention.

  Moreover, in this embodiment mentioned above, although the recessed part 38 was formed in the side wall part 32B of the airbag case lower 32 by drawing, not only this but the recessed part 38 is formed when casting an airbag case with casting. A configuration may be employed, or a configuration in which the recess 38 is formed when an airbag case is manufactured by resin molding may be employed.

  Furthermore, in the present embodiment described above, the recess 38 is formed in a substantially V-shape, but the present invention is not limited to this, and may be a recess having a shape in which the “convex” character is turned upside down.

  Moreover, in this embodiment mentioned above, although this invention was applied to the hood airbag apparatus 10 for vehicles, it is not only this but it is a box-shaped case arrange | positioned in the position which may be flooded, Comprising: The present invention is applicable if it is necessary to pass the harness.

It is the longitudinal cross-sectional view (1-1 sectional view taken on the line of FIG. 4) which looked at the state which cut | disconnected the vehicle hood airbag apparatus which concerns on this embodiment along the vehicle front-back direction. It is the longitudinal cross-sectional view (2-2 sectional view taken on the line of FIG. 4) which looked at the state which cut | disconnected the vehicle hood airbag apparatus from the position different from FIG. FIG. 2 is an external perspective view of the vehicle showing a non-operating state of the vehicle hood airbag device shown in FIG. 1 with a solid line and an operating state with a two-dot chain line. It is a principal part expansion perspective view which shows the state by which the grommet was mounted | worn in the recessed part of the airbag case lower. It is a principal part expansion perspective view which shows the state before mounting | wearing a grommet with the recessed part of an airbag case lower. It is an expansion perspective view which shows a grommet by a single item. It is a longitudinal cross-sectional view corresponding to FIG. 1 which shows another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle hood airbag apparatus 12 Vehicle 13 Engine room 14 Hood 30 Air bag case (case)
32A Bottom wall portion 32A 'Bottom surface 32B Side wall portion 32C Flange portion 38 Recessed portion 38A Inclined portion 40 Grommet 42 Groove portion 44 Drainage channel 46 Through hole 47 Wire harness 52A Vertical wall 54 Lip portion 56 Cowl louver 56A Cowl louver extending portion 58 Inflator (gas generating means) )
60 Airbag 67 Seal member 68 Convex part (water blocking wall)
70 Cowl louver 70A Cowl louver extension

Claims (6)

A box-like case installed in a position where there is a possibility of being exposed to water outside the vehicle compartment;
A recess formed on an arbitrary side wall portion of the case and opened from the upper edge of the side wall portion to the bottom surface of the case; and
A grommet that is attached to the recess and has a through-hole for inserting a wire harness, and that forms a drainage channel between the bottom surface of the case when attached to the recess,
A vehicle drainage structure characterized by comprising: Gas generating means for generating gas at the time of collision with a collision object;
An airbag that is inflated and deployed on the hood by the gas generated from the gas generating means being supplied;
A box-shaped airbag case that is disposed on the lower surface side of the hood and accommodates the gas generating means and the folded airbag;
A drainage structure applied to a vehicle hood airbag device having
A recess formed on the side wall of the airbag case and opened from the upper edge of the side wall to the bottom of the airbag case;
A grommet that is attached to the recess and has a through-hole for inserting a wire harness, and that forms a drainage channel with the bottom surface of the airbag case when attached to the recess,
A drainage structure for a hood airbag device for a vehicle, comprising: The concave portion is formed in a substantially V shape and includes a pair of inclined portions,
Grooves are formed with grooves that are inserted into the pair of inclined portions.
The drainage structure for a hood airbag device for a vehicle according to claim 2. The grommet is provided with a vertical wall that hangs downward from the bottom surface of the airbag case at a position separated from the drainage direction side of the drainage channel.
4. A drainage structure for a hood airbag device for a vehicle according to claim 2 or claim 3. Below the bottom wall portion of the airbag case, there is a seal member that is attached to the cowl louver extension portion that extends from the cowl louver to the engine room and seals the lower surface of the bottom wall portion of the airbag case. Has been established,
Further, the grommet is provided with a lip portion that is positioned on the outlet side of the drainage channel from the seal member and prevents the inflow of water to the seal member side.
The drainage structure for a hood airbag device for a vehicle according to any one of claims 2 to 4, wherein the drainage structure is a hood airbag device. The cowl louver is formed with a water stop wall that is in contact with the lip portion and prevents the inflow of water into the seal member together with the lip portion.
The drainage structure for a hood airbag device for a vehicle according to claim 5.

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