JP2007030841A - Airbag door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag door capable of smoothly opening a door panel, and preventing any damage of the door panel and an interior member of a vehicle. <P>SOLUTION: In a break scheduled part 30 formed along an outer edge of a door panel 20, the breakage area of first break scheduled parts 34, 36 extending in the direction not across a hinge part is minimum at center parts 34A, 36A in their longitudinal direction, and the breakage area is gradually increased from the center parts 34A, 36A to both ends 34B, 36B. The breakage area of second break scheduled parts 38, 40 extending in the direction across the hinge part is minimum at first ends 38A, 40A separate from the hinge part. The breakage area is maximum at second ends 38B, 40B close to the hinge part, and the breakage area is set to be gradually increased from the first ends 38A, 40A to the second ends 38B, 40B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an airbag door, and more specifically, includes a door panel provided in a polygonal shape on a base material of a vehicle interior member, and having a hinge portion extending along one side of the outer edge thereof. The airbag door includes a first planned fracture portion that extends in a direction that does not intersect the hinge portion and a second planned fracture portion that extends in a direction that intersects with the hinge portion. It is.

  Most passenger cars produced in recent years are standardly equipped with a driver's seat airbag device and a passenger's seat airbag device as one of the devices for protecting passengers in the event of a collision with an oncoming vehicle. For example, as illustrated in FIG. 9, the airbag device 50 for the passenger seat is stored in the instrument panel (vehicle interior member) 10 assembled in front of the vehicle passenger compartment so as not to be seen from the passenger seat. It is installed. For this reason, the synthetic resin base material 12 constituting the instrument panel 10 is provided with an airbag door AD1 at a position corresponding to the inflator case 52 of the airbag device 50. When the airbag door AD1 receives the pressing force of the airbag 54 that has started to be inflated by the operation of the airbag device 50, the door panel 20 opens outward with a hinge portion 28 described later as the center, and the base material 12 Open an opening for air bag passage. Reference numeral 14 denotes a skin that is attached to the outer surfaces of the base 12 and the airbag door AD1.

  Airbag doors, based on the number of door panels, have been put into practical use, such as a single-open type consisting of one door panel, a double-open type consisting of two door panels, and a four-way open type consisting of four door panels. Each type has a door panel having a polygonal shape (in many cases, a quadrangular shape and / or a triangular shape). The airbag door AD1 illustrated in FIG. 9 is a double-open type including two door panels 20 and 20 having a quadrangular shape. Further, the airbag door AD1 is formed integrally with the base material 12 and is formed integrally with the base material 12 before opening. It is a substrate-integrated type that forms a part. For this reason, the base material 12 has a planned fracture portion 30 extending along the outer edge portion of each of the door panels 20, 20. When the pressing force of the airbag 54 is applied to the back surface during the operation of the airbag device 50, The planned fracture portion 30 is broken, and both door panels 20 and 20 are separated from the base material 12. In addition, when the planned fracture portion 30 is broken, the above-described skin 14 is also broken along the planned fracture portion 30.

  The hinge portion 28 described above is provided in the insert member 22 that reinforces the airbag door AD1 and the outer portion thereof, and the fixing support portion 24 connected to the inflator case 52 and the back side of the door peripheral portion, and the fixing portion 24, respectively. The movable support portions 26, 26 that are provided inside the opening of the support portion 24 and are fixed to the back side of the door panels 20, 20 are connected to each other, and are positioned along one side of the outer edge in the longitudinal direction of the door panel 20. Therefore, each door panel 20 separated from the base material 12 by the breakage of the planned breakage portion 30 is opened around the hinge portion 28 while being supported by the movable support portion 26 connected to the hinge portion 28.

Here, as a method of forming the planned fracture portion 30 along the outer edge of the door panel 20, for example, as illustrated in FIGS. 10 to 12, so-called bottomed holes 32 are formed at a predetermined equal pitch by a laser drilling machine. There are adopted a method of perforating to make it weak by perforating, or a method of making weak by extending a groove along the outer edge to make it weak, although not shown. Since such a planned fracture portion 30 is formed along the four sides of the outer edge of each of the square door panels 20, 20, the first fracture planned portions 34, 36 extending in a direction not intersecting with the hinge portion 28, and The second fracture scheduled portions 38 and 40 extending in a direction intersecting with the hinge portion 28 are configured. Such an airbag door is disclosed in Patent Document 1, for example.
JP 2004-50929 A

  By the way, when the smooth opening displacement of each door panel 20 centering on the hinge part 28 is considered, it is desirable to fracture | rupture the fracture | rupture planned part 30 by the following fracture processes. In other words, in the first half of the pressing when the pressing force of the airbag 54 is started, the first planned breakage portion 34 extending along the boundary portion between the door panels 20 and 20 is broken and the door panels 20 and 20 are separated from each other. Let Next, in the second half of the pressing stage in which the pressing force of the airbag 54 is further applied, the second planned fracture portions 38 and 40 on both sides are broken, and the first planned fracture portion 36 extending along the hinge portion 28 is broken. Then, the door panels 20 and 20 are separated from the base material 12. If the scheduled breakage portion 30 is broken by such a breaking process, the door panels 20 and 20 can be smoothly opened around the hinge portion 28.

  However, the airbag 54 that has started to inflate due to the operation of the airbag device 50 has a first half stage of pressing as illustrated by a two-dot chain line in FIG. 9 due to factors such as variations in the gas pressure in the airbag 54. It is difficult to define the pressing point. That is, in the first half of the pressing of the airbag 54, a pressing force may be first applied to the vicinity of the boundary portion between the door panels 20 and 20 where the first planned breakage portion 34 is located. There may be a case where the pressing force is first applied to a position deviated from the first fracture planned portion 34 such as a portion near the portion 28.

  In addition, the planned break portion 30 described above is set so that the break area is substantially the same at any part of the outer edge of the door panel 20. That is, in the case of the planned fracture portion 30 by drilling the narrow hole 32 illustrated in FIGS. 10 to 12, the outer edge portion of the door panel 20 has the same thickness at any part, and thus is formed at an equal pitch. Each narrow hole 32 has the same depth, and therefore the breaking strength of the planned breaking portion 30 is substantially constant at any part. On the other hand, in the case of the portion to be broken due to the extension of the groove, since the depth of the groove is formed constant, the breaking strength of the portion to be broken is similarly made constant at any part.

  Thus, in the conventional airbag door AD1, the breaking process of the planned breaking part 30 often does not become the ideal mode as described above. That is, there is a possibility that the break start position is not the first break planned portion 34 formed at the boundary portion between the door panels 20 but the second break planned portions 38 and 40 are broken earlier. Further, even if the break start position is near the center of the first break planned portion 34, the break start timing may be delayed because much energy is required for breakage of this portion. For this reason, various problems such as (1) delay in opening the door panel 20, (2) damage to the door panel 20 and / or the base material 12, and (3) energy loss of the airbag 54 have occurred.

  Accordingly, the present invention makes it possible to smoothly open the door panel, prevent the door panel and the vehicle interior member from being damaged, and avoid the energy loss of the airbag by making the break start position, the break start timing and the break process appropriate in the planned break portion. An object of the present invention is to provide an airbag door that can be realized.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 1 of the present application provides:
A vehicle interior member base material is provided in a polygonal shape, and has a door panel with a hinge portion extending along one side of the outer edge thereof, and a planned fracture portion formed along the outer edge of the door panel intersects the hinge portion. In an airbag door composed of a first planned break portion extending in a direction not to be cut and a second planned break portion extending in a direction crossing the hinge portion,
The first planned fracture portion is set so that the fracture area is minimized at the central portion in the length direction,
The gist of the second fracture-scheduled portion is set so that the fracture area is minimized at the first end portion separated from the hinge portion, and the fracture area is maximized at the second end portion close to the hinge portion. To do.

  Therefore, according to the airbag door described in claim 1, since the breaking area (breaking strength) of the center portion of the first scheduled breaking portion is minimized, the breaking always starts when the pressing force of the airbag is applied. There is an advantage that the point becomes the central portion of the first fracture planned portion and the break start timing is appropriate.

The invention according to claim 2 of the present application is the invention according to claim 1, wherein the first fracture planned portion has a fracture area that gradually increases from the central portion toward both end portions, and the second fracture planned portion. Is summarized in that the fracture area gradually increases from the first end toward the second end.
Therefore, according to the second aspect of the present invention, the break starting from the central portion of the first planned fracture portion located away from the hinge portion proceeds to both end portions of the first planned fracture portion and gradually becomes the hinge portion. Therefore, the breaking process of the planned breaking portion is optimized, and the door panel is opened smoothly around the hinge portion. Therefore, since the energy of the airbag consumed when the airbag door is opened can be suppressed, energy loss of the airbag can be reduced.

The invention according to claim 3 of the present application is the invention according to claim 1 or 2, wherein the break area of the first and second break planned portions is the thickness of the outer edge portion of the door panel. The gist is to increase or decrease by changing along.
Therefore, according to the invention according to claim 3, since the thickness of the outer edge portion of the door panel can be changed for each part, it can be realized only by appropriately adjusting the mold for molding the base material. There is almost no cost increase for changing the fracture area (breaking strength) of the planned portion.

  According to the airbag door according to the present invention, since the fracture process of the planned fracture portion is appropriate, there is an advantage that smooth opening of the door panel can be suitably realized.

  Next, a preferred embodiment of the airbag door according to the present invention will be described below with reference to the accompanying drawings. Note that the airbag door targeted by the present invention has a polygonal door panel, such as a single-opening type consisting of one door panel, a double-opening type consisting of two door panels, and a four-way opening type consisting of four door panels. It is. Therefore, in each embodiment described later, a double-open type airbag door composed of two rectangular door panels will be exemplified, and thus the above-described members in the prior art section described with reference to FIGS. The same members / parts as the parts will be described with the same reference numerals.

  The airbag door AD of the present embodiment is provided in a square shape on a base material 12 constituting an instrument panel (vehicle interior member) 10, and door panels 20, 20 with hinge portions 28 extending along one side of the outer edge thereof. Have Then, the planned fracture portion 30 formed along the outer edge of each door panel 20, 20 has a first fracture planned portion 34, 36 extending in a direction not intersecting with the hinge portion 28, and a direction intersecting the hinge portion 28. It is comprised from the 2nd fracture | rupture plan part 38,40 extended. The “polygonal shape” defined in the present application is a triangle, a rectangle, a square, a trapezoid, a quadrilateral such as a parallelogram, a polygon such as more than this, and an air having one or more such door panels 20. All bag doors are targeted.

  The above-described planned fracture portion 30 is weakened by drilling the bottomed narrow holes 32 in a perforated manner at an equal pitch along the outer edges of the door panels 20 and 20 using a laser drilling machine (not shown). Is planned. These bottomed narrow holes 32 have the same distance L between the tip of the bottom and the surface 12A of the base material 12 as shown in an enlarged view in FIG. It is drilled to become. Therefore, when viewed from the surface 12A side of the base material 12, the presence of the planned fracture portion 30 and the presence of the door panel 20 due to the narrow holes 32 are not visually recognized at all.

  And the airbag door AD of a present Example is formed so that the thickness of the outer edge part of each door panel 20 and 20 may differ for every site | part so that it may illustrate next, as illustrated in FIG. . Specifically, in the outer edge portion along the open free end 42 of each door panel 20, 20, that is, the outer edge portion adjacent to the first fracture planned portion 34 before opening, as illustrated in FIG. The thickness is set to the minimum H1, and the thickness at both ends adjacent to each of the second planned fracture portions 38 and 40 is set to the maximum H2, and the thickness is increased from the center toward both ends. Is set to increase gradually.

  Moreover, in the outer edge part along the open base end 44 in each door panel 20,20, ie, the outer edge part adjacent to the 1st planned fracture | rupture part 36 before opening, as shown in FIG. The minimum H3 is set, the thicknesses at both ends adjacent to the second planned fracture portions 38, 40 are set to the maximum H4, and the thickness gradually increases from the center toward both ends. It is set to do. In addition, when the outer edge portions along the open free end 42 and the open base end 44 are compared, although both are common in that the thickness of the central portion is minimum and the thickness of both ends is maximum, The outer edge portion along the open base end 44 is set to be generally thicker than the free end 42. That is, the thickness H2 of both ends of the open free end 42 and the thickness H3 of the central portion of the open base end 44 are set to be substantially the same, and the thickness H1 of the central portion of the open free end 42 is minimum and open. The thickness H4 at both ends of the base end 44 is the maximum.

  On the other hand, in the outer edge portion along the side end portion 46 in the door panel 20, 20, that is, the outer edge portion adjacent to the second fracture planned portion 38 before opening, as shown in FIG. The thickness at the end of the open base end 44 side is set at the maximum H4, and the open free end 42 side is directed toward the open base end 44 side. The thickness is set to increase gradually. Similarly, an outer edge portion along the side end portion 48 of the door panels 20, 20, that is, an outer edge portion adjacent to the second fracture planned portion 40 before opening is not shown, but the thickness at the end portion on the opening free end 42 side is omitted. Is set to the minimum H2, the thickness at the end on the open base end 44 side is set to the maximum H4, and the thickness is from the open free end 42 side to the open base end 44 side. Is set to increase gradually.

  By setting the thicknesses of the outer edges of the four sides of the door panels 20 and 20 as described above, the planned break portion 30 in the airbag door AD of the present embodiment has the following mode. First, as shown in FIG. 1 and schematically shown in FIG. 6, the first planned fracture portion 34 extending in a direction not intersecting with the hinge portion 28 at a position separated from the hinge portion 28 is free to open the door panel 20. Since the end 42 is set to the above-described thickness setting, the depth D of each narrow hole 32 drilled along the planned fracture portion 34 is minimally drilled near the central portion 34A. What is perforated at each end portion 34B is the maximum, and the depth D gradually increases from the central portion 36A toward the end portion 36B. As a result, the fracture area of the first planned fracture portion 34 is minimized at the central portion 34A, maximized at the end portions 34B on both sides, and gradually increases from the central portion 34A toward the end portions 34B on both sides. In other words, the first breaking planned portion 34 has the smallest breaking strength at the central portion 34A, and the breaking strength gradually increases toward the respective end portions 34B on both sides, and the breaking strength is maximized at each end portion 34B. It has become.

  Further, as shown in FIG. 2 and schematically shown in FIG. 6, the first fracture scheduled portion 36 extending adjacent to the hinge portion 28 has the thickness setting described above for the open base end 44 of the door panel 20. As a result, the depth D of each narrow hole 32 drilled along the planned fracture portion 36 is minimally drilled in the vicinity of the central portion 36A, and is drilled in each end portion 36B. And the depth D gradually increases from the central portion 36A toward the end portion 36B. As a result, the fracture area of the first planned fracture portion 36 is minimized at the center portion 36A, maximized at each end portion 36B on both sides, and gradually increases from the center portion 36A toward each end portion 36B on both sides. In other words, the first breaking planned portion 36 has the smallest breaking strength at the center portion 36A, and the breaking strength gradually increases toward the respective end portions 36B on both sides, and the breaking strength is maximized at each end portion 36B. It has become.

  On the other hand, the second planned fracture portions 38 and 40 extending across the hinge portion 28 are illustrated in FIG. 3 and the side end portions 46 and 48 of the door panel 20 are the same as shown in FIG. By setting the thickness as described above, the depth D of each narrow hole 32 drilled along the planned fracture portions 38 and 40 is in the vicinity of the first end portions 38A and 40A separated from the hinge portion 28. The one drilled is the smallest, the one drilled in the vicinity of the second end portions 38B, 40B close to the hinge portion 28 is the largest, and as it goes from the first end portions 38A, 40A to the second end portions 38B, 40B. The depth D is gradually increased. As a result, the fracture area of each of the second planned fracture portions 38 and 40 is minimized at the first end portions 38A and 40A, maximized at the second end portions 38B and 40B, and from the first end portions 38A and 40A. It gradually increases toward the second end portions 38B and 40B. In other words, the break strength at the first end portions 38A, 40A is minimum at the second planned break portions 38, 40, and the breaks occur from the first end portions 38A, 40A toward the second end portions 38B, 40B. The strength gradually increases, and the breaking strength is maximized at the second end portions 38B and 40B.

  Here, the first planned fracture portion 34 located at the boundary between the door panels 20 and 20 and the second planned fracture portions 38 and 40 located on both sides of the door panels 20 and 20 are illustrated in FIGS. 1 and 3. As described above, since both the end portions 34B and 34B and the first end portions 38A and 40A are connected to each other, the breaking area (breaking strength) of the end portion 34B and the first end portions 38A and 40A is substantially the same. They are set the same. Further, the second planned fracture portions 38 and 40 located on the left and right portions of the door panels 20 and 20 and the first planned fracture portion 36 located adjacent to the hinge portions 28 of the door panels 20 and 20 are shown in FIG. As illustrated in FIG. 3, since the second end portions 38B and 40B and the end portion 36B of both are connected to each other, the fracture area (breaking strength) of the second end portions 38B and 40B and the end portion 36B. Are set approximately the same.

  Therefore, the breakage portion 30 in the airbag door AD of the present embodiment has the smallest breakage area at the central portion 34A of the first breakage portion 34 that does not intersect the hinge portion 28 at a position separated from the hinge portion 28. The fracture area at the second end portions 38B and 40B of the second fracture planned portions 38 and 40 is maximized. As described above, the fracture area at the first end portions 38A, 40A of the second planned fracture portions 38, 40 and the fracture area at the central portion 36A of the first planned fracture portion 36 are set to be substantially the same. ing. That is, the breaking strength of the central portion 34A of the first planned breaking portion 34 is minimum, and the breaking strengths of the second end portions 38B, 40B of the second scheduled breaking portions 38, 40 are maximum.

  As a result, in the first half stage of pressing when the pressing force of the inflated airbag 54 starts to be applied to the back surfaces of the door panels 20, 20, the stress associated with the pressing force is the breaking strength regardless of the location of the pressing point. Is concentrated on the central portion 34A where the minimum is (FIG. 5A). That is, even if the pressing point is a position deviated from the vicinity of the central portion 34A of the first planned fracture portion 34, the fracture start point in the planned fracture portion 30 is always the central portion 34A of the first planned fracture portion 34 ( FIG. 5 (b)).

  Then, when the rupture starts at the central portion 34A of the first planned rupture portion 34 and the pressing force of the airbag 54 is further applied, the rupture of the first planned rupture portion 34 proceeds to both sides toward both end portions 34B and 34B. The door panels 20 and 20 are separated from each other by completing the breaking of the first fracture scheduled portion 34.

  Next, in the latter half of the pressing by the airbag 54, the breakage of the second scheduled breakage portions 38, 40 on both the left and right sides starts from the first end portions 38A, 40A, and the door panels 20, 20 are gradually opened from the open free end 42 side. (Fig. 5 (c)). Further, in the process in which the breakage of the second planned break portions 38, 40 progresses toward the second end portions 38B, 40B, substantially simultaneously with this, the central portion 36A of the first planned break portion 36 adjacent to the hinge portion 28 is also broken. Begins.

  Then, the breakage of both the second planned break portions 38 and 40 and the breakage of the first planned breakage portion 36 proceed substantially simultaneously. With this, the opening angle of both door panels 20 and 20 increases and the posture is displaced to a vertical level. At the time, the breakage of each of the planned breakage portions 38, 40, and 36 comes to be connected. As a result, the door panels 20 and 20 are completely separated from the base material 12 and are thus opened outward while being supported by the corresponding hinge portions 28 and 28 (FIG. 5D).

  According to the airbag door AD of the present embodiment, the following operational effects are obtained. First, when the pressing force of the airbag 54 is applied, the rupture area (breakage of the central portion 34A of the first rupture scheduled portion 34 located at the boundary portion between the door panels 20 and 20 (positioned away from the hinge portion 28). Since the strength is minimized, there is an advantage that the break start point is always constant. In addition, since the rupture starts at the central portion 34A at an appropriate time in the first half of the pressing when the pressing force of the airbag 54 is started, the rupture start timing is appropriate.

  In addition, the break starting from the central portion 34A of the first planned break portion 34 proceeds to both end portions 34B, 34B of the first planned break portion 34, and the second planned break portions 38, 40 on both the left and right sides continue to break. At the same time, the first planned break portion 36 adjacent to the hinge portion 28 is broken. Accordingly, the fracture starts from the central portion 34A of the first planned fracture portion 34 located away from the hinge portion 28 and proceeds so that the fracture gradually approaches the hinge portion 28. Therefore, the fracture process of the planned fracture portion 30 is optimal. Thus, the opening of the door panels 20, 20 around the hinges 28, 28 proceeds smoothly.

  In addition, the first fracture scheduled portion 34 gradually increases in fracture area (breaking strength) from the central portion 34A toward both end portions 34B and 34B, and the second planned fracture portions 38 and 40 are spaced apart from the hinge portion 28. The breaking area (breaking strength) is gradually increased from the first end portions 38A, 40A toward the second end portions 38B, 40B adjacent to the hinge portion 28. For this reason, the break that started at the central portion 34A of the first planned break portion 34 proceeds smoothly from the first planned break portion 34 to the second end portions 38B, 40B of the second planned break portions 38, 40. become. Therefore, the breakage of the planned breakage portion 30 can be advanced with a small pressing force by the airbag 54, and the energy of the airbag 54 consumed when the airbag door AD is opened can be suppressed. Loss can be reduced.

  In addition, the fracture area of the first fracture scheduled portion 34 and the second fracture scheduled portion 38, 40 can be easily increased or decreased simply by changing the thickness of the outer edge portion of the door panel 20, 20 for each part. The thickness setting of the door panels 20 and 20 can be realized only by appropriately adjusting the mold surface of the base 12 molding die, so that the breaking area (breaking strength) of the planned breaking portion 30 can be changed. There is almost no cost increase.

  In the above-described embodiment, the fracture planned portion 30 weakened by drilling the narrow holes 32 at an equal pitch along the outer edge line of the door panels 20 and 20 is exemplified. However, the present invention is directed to the door panels 20 and 20. This can also be applied to an airbag door having a planned fracture portion 30 that is weakened by extending a groove along the outer edge line. That is, by adjusting the shallow depth of the groove, it is possible to change and adjust the fracture area (rupture strength) of the planned fracture portion 30.

  In the above-described embodiment, the double door type airbag door AD including the two door panels 20 and 20 is illustrated, but the airbag door AD targeted by the present application is the single door type including the single door panel, 4 A four-way opening type consisting of a single door panel is also included. In the case of a single-opening type airbag door AD, as illustrated in FIG. 7, the first scheduled break portion has a single rectangular door panel 20 and extends in a direction not intersecting with the hinge portion 28. 34 and 36 are set so that the fracture area is minimized at the central portions 34A and 36A in the length direction. Further, the second planned fracture portions 38 and 40 extending in the direction intersecting with the hinge portion 28 have the smallest fracture area at the first end portions 38A and 40A separated from the hinge portion 28, and are close to the hinge portion 28. It sets so that a fracture | rupture area may become the maximum in 2nd edge part 38B, 40B. Thereby, the same effect as the airbag door AD of the Example mentioned above can be acquired.

  In the case of a four-way opening type airbag door AD, as shown in FIG. 8, there are two rectangular (trapezoidal) door panels 20 and 20 and two triangular door panels 20 and 20. Of these, the two first rectangular door panels 20, 20 each have a first portion 34, 36 that extends in a direction not intersecting with the hinge portion 28, and a central portion 34 </ b> A in the length direction thereof. 36A, the fracture area is set to be minimum. Further, the second planned fracture portions 38 and 40 extending in the direction intersecting with the hinge portion 28 have the smallest fracture area at the first end portions 38A and 40A separated from the hinge portion 28, and are close to the hinge portion 28. It sets so that a fracture | rupture area may become the maximum in 2nd edge part 38B, 40B. Thereby, the same effect as the airbag door AD of the Example mentioned above can be acquired. In addition, regarding the two door panels 20 and 20 having a triangular shape, the first fracture planned portion 36 extending in a direction not intersecting with the hinge portion 28 has the smallest fracture area in the central portion 36A in the length direction. Set to Moreover, the 2nd fracture | rupture planned part 38 and 40 extended in the direction which cross | intersects the hinge part 28 is as having mentioned above.

  Moreover, in the Example mentioned above, although the airbag door which adhered the outer skin 14 to the outer surface of the door panels 20 and 20 was illustrated, the airbag door which this application makes object is the type exposed to the outer surface of the instrument panel 10, A type in which the outer skin 14 and the foam are attached to the outer surfaces of the door panels 20 and 20 in a laminated form is also included.

  Further, in the above-described embodiment, the airbag door AD of the type in which each door panel 20 is completely separated from the base material 12 when the planned breakage portion 30 breaks is illustrated. The present invention can also be suitably applied to an airbag door of a type in which the side is not separated from the base material 12.

  Further, in the above-described embodiment, the base material integrated type in which the door panels 20 and 20 are formed on the base material 12 is exemplified, but the present invention is an airbag door provided on a door molded body to be attached to the base material 12 later. Moreover, it can be suitably implemented.

  Furthermore, in the above-described embodiment, the instrument panel is exemplified as the vehicle interior member, but the airbag door targeted by the present invention is also intended to be provided with a door panel, a pillar garnish, a roof side garnish, and the like.

  The airbag door according to the present invention can be suitably implemented in an airbag door provided on a vehicle interior member of various automobiles equipped with an airbag device.

The longitudinal cross-sectional front view of the airbag door fractured | ruptured along the 1st fracture plan part formed in the open free end. The longitudinal section front view of the airbag door fractured | ruptured along the 1st fracture plan part formed in the open base end. The vertical side view of the airbag door fractured | ruptured along the 2nd fracture plan part formed in the side end. The perspective view which showed the to-be-breakable part formed along the door panel which changed thickness for every site | part of the outer edge part, and its outer edge part. Explanatory drawing which showed the fracture | rupture process of the planned fracture | rupture part by the pressing force of an airbag, and the opening aspect of a door panel. The elements on larger scale of the part to be broken. The perspective view which showed the fracture | rupture plan part of the single-opening type airbag door which consists of one door panel. The perspective view which showed the fracture | rupture plan part of the four-way opening type airbag door which consists of four door panels. The schematic sectional drawing of the conventional airbag door provided in the instrument panel. FIG. 6 is a perspective view showing a door panel in which the thickness of the outer edge portion is the same for each part and a planned fracture portion formed along the outer edge portion. XI-XI sectional view taken on the line of FIG. XII-XII sectional view taken on the line of FIG.

Explanation of symbols

12 base material, 20 door panel, 28 hinge part, 30 planned break part,
34 1st planned fracture part, 34A center part, 36 1st planned fracture part, 36A center part,
38 second fracture portion, 38A first end, 38B second end,
40 Second expected fracture portion, 40A first end portion, 40B second end portion

Claims (3)

The vehicle interior member base material (12) is provided in a polygonal shape, and has a door panel (20) with a hinge portion (28) extending along one side of the outer edge thereof, along the outer edge of the door panel (20). The formed planned fracture portion (30) extends in a direction intersecting the first fracture planned portion (34, 36) extending in a direction not intersecting with the hinge portion (28) and the hinge portion (28). 2 In the airbag door composed of the planned break (38,40)
The first planned fracture portion (34, 36) is set so that the fracture area is minimized at the central portion (34A, 36A) in the length direction,
The second fracture-scheduled portion (38, 40) has a first fracture portion (38A, 40A) spaced apart from the hinge portion (28) and has the smallest fracture area, and the second end adjacent to the hinge portion (28). An airbag door characterized in that the breaking area is set to a maximum at the portion (38B, 40B).   The first fracture planned portion (34, 36) has a fracture area that gradually increases from the central portion (34A, 36A) toward both end portions (34B, 36B), and the second planned fracture portion (38, 40). The airbag door according to claim 1, wherein the breaking area gradually increases from the first end (38A, 40A) toward the second end (38B, 40B). The fracture area of the first planned fracture portion (34, 36) and the second planned fracture portion (38, 40) is increased or decreased by changing the thickness of the outer edge portion of the door panel (20) along the outer edge. Item 3. The airbag door according to item 1 or 2.

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