JP7337673B2 - air bag door - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airbag door formed on an interior panel having a base material, a cushion layer bonded to the surface of the base material, and a skin bonded to the surface of the cushion layer.

In Patent Document 1, an interior panel having a base material, a cushion layer bonded to the surface of the base material, and a skin bonded to the surface of the cushion layer is formed, and two door parts are formed. The door portion is configured to be double-openable, and the door portion has a planned base material opening operation region surrounded by the planned base material breaking line in the base material and a planned skin opening operation region surrounded by the planned skin breaking line in the skin. The airbag door is opened by the base material breakage line and the skin breakage line being broken by the inflation pressure of the airbag. In this airbag door, the expected base material breakage line of each door portion is arranged so that the base material center tear line extending substantially linearly in a predetermined first direction and the both ends of the base material center tear line are opposed to each other. It consists of a pair of extending base material side tear lines. Further, the estimated skin breaking line of each door portion is divided into a center skin tear line extending substantially linearly in the first direction and a second direction perpendicular to the first direction extending from both ends of the center skin tear line. and a pair of skin side tear lines extending so as to incline outward in the first direction. As a result, the breaking force acting on the skin center tear line is transmitted to the skin side tear line more smoothly than when the skin side tear line is provided at right angles to the skin center tear line. Furthermore, by arranging the edge on the anti-skin center tear line side (edge on the hinge side) and the skin side tear line in the planned skin opening operation region outside the planned region for opening the base material, the planned skin breaking operation is performed. The areas of the four areas demarcated by the lines are increased so that the airbag doors can be opened smoothly.

Japanese Patent No. 5305835

By the way, in Patent Document 1, when the airbag door is operated to open, both corners of the skin on the anti-skin center tear line side (hinge side) in the skin opening operation scheduled region do not overlap with the base material. The substrate is pulled to the opening operation planned area. Therefore, if the physical properties of the skin of the airbag door deteriorate due to secular change or the like, both corners of the skin on the anti-skin center tear line side in the skin opening operation scheduled region may break and scatter.

The present invention has been made in view of this point, and its object is to prevent the corner of the skin on the anti-skin center tear line side in the skin opening operation planned region from breaking and scattering. It is in.

In order to achieve the above object, the present invention is characterized in that the tip of the substrate side tear line of the substrate is arranged so as to approach or overlap with the tip of the epidermis side tear line of the epidermis when viewed from the front and back directions. and

Specifically, the first invention is formed in an interior panel having a substrate, a cushion layer bonded to the surface of the substrate, and a skin bonded to the surface of the cushion layer, At least one door portion is provided, and the door portion includes a base material-opening operation planned region surrounded by a base material breaking planned line in the base material, and a skin opening planned region surrounded by the skin breaking planned line in the epidermis. and the airbag door is opened by the breakage of the projected base material breakage line and the projected skin breakage line due to the expansion pressure of the airbag, and the following means for solving the problem are taken.

That is, in a first aspect of the present invention, the expected base material breaking line includes a base material center tear line that extends substantially linearly in a predetermined first direction, and a base material center tear line that extends from both ends of the base material center tear line so as to face each other. and a pair of base material side tear lines extending from the base material side tear line, and an inclined line inclined outward in the first direction toward the tip side is formed at the tip of the base material side tear line, and the skin is to be broken. A skin center tear line extending substantially linearly in the first direction, and a line extending outward in the first direction from both ends of the skin center tear line in a second direction perpendicular to the first direction. and a pair of skin side tear lines extending obliquely, wherein the base material center tear line and the skin center tear line overlap each other with the cushion layer interposed therebetween, forming a base of the skin side tear line. The portion excluding the end and the tip is located outside the base material side tear line, and the distance between the base end of the base material side tear line and the base end of the skin side tear line is the same as the cushion when viewed from the front and back direction. The inclined line of the base material side tear line is set to be equal to or less than the thickness of the layer, and the inclined line of the base material side tear line approaches the skin side tear line toward the tip side, and the tip of the base material side tear line and the tip of the skin side tear line are connected. is set to be equal to or less than the thickness of the cushion layer when viewed from the front and back directions, and the bonding force between the cushion layer and the outer skin is set higher than the bonding force between the base material and the cushion layer. It is characterized by

A second invention is the airbag door according to the first invention, characterized in that the two door portions sharing the substrate center tear line and the skin center tear line are configured to be double-opening. and

According to the first invention, when the airbag door is operated to open, the base material in the vicinity of the tip of the side tear line of the base material is attached from the back side to both corners on the anti-skin center tear line side in the skin opening operation scheduled region of the skin. Since the skin is overlapped and reinforced, even if the physical properties of the airbag door skin deteriorate over time, the corner of the skin on the anti-skin center tear line side in the area where the skin is scheduled to open will break and scatter. can prevent it from happening.

In addition, since the skin side tear line is provided so as to form an obtuse angle with respect to the skin center tear line on the side of the region where the skin is to be opened, the airbag door is less likely to be damaged than when it is provided at right angles to the skin center tear line. The rupture force of the center skin tear line that breaks during the opening operation is easily transmitted to both skin side tear lines. Therefore, even if the physical properties of the skin of the airbag door have deteriorated over time, only the center tear line and side tear line of the skin can be reliably broken, and the skin around the base end of the side tear line can be removed. It can prevent breakage and scattering.

In addition , the portion of the skin scheduled for opening operation that does not overlap with the scheduled substrate opening operation region of the base material overlaps with the cushion layer and is reinforced by the cushion layer so as to easily open. Therefore, when the airbag door is operated to open, it is possible to prevent the portion of the skin that does not overlap with the substrate opening planned region of the base material from breaking and scattering.

According to the second invention, the inflation pressure of the airbag is applied to the two door portions in a distributed manner, so that the stress generated in the outer skin can be reduced compared to the case where the pressure is applied intensively to one door portion. Therefore, it is possible to suppress the breakage of the epidermis at a portion other than the expected line of breakage of the epidermis.

1 is a perspective view of an instrument panel formed with an airbag door according to an embodiment of the present invention; FIG. FIG. 4 is a plan view of the left end portion of the upper panel portion of the instrument panel on which the airbag door according to the embodiment of the present invention is formed; FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2; FIG. 3 is a view equivalent to FIG. 2 after the airbag door has been opened; FIG. 5 is a view corresponding to FIG. 4 when the airbag door is opened;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an instrument panel 1 as an interior panel arranged in the front part of the passenger compartment of an automobile. The instrument panel 1 has an upper panel portion 1a extending substantially horizontally in the vehicle width direction and a lower panel portion 1b extending downward from the full width of the rear end of the upper panel portion 1a. ing. A meter hood portion 1c is formed on the right side (driver's seat side) of the upper panel portion 1a so as to bulge upward.

The instrument panel 1 has a resin base material 3 and a resin pad 5 partially formed on the surface of the base material 3, as shown in FIGS. The pad 5 is provided in a region of the instrument panel 1 excluding the front end portion of the upper panel portion 1a and the upper end portion of the lower panel portion 1b. Therefore, at the front end portion of the upper panel portion 1a and the lower end portion of the lower panel portion 1b of the instrument panel 1, the base material 3 is exposed. The pad 5 is composed of a cushion layer 7 bonded to the surface of the base material 3 and a skin 9 bonded to the surface of the cushion layer 7 .

The substrate 3 has a substrate main body 11 as its main body. The base body 11 is injection-molded from a resin material such as fiber-filled polypropylene (PP), acrylonitrile-butadiene-styrene (ABS) resin, noryl resin, or the like. The base material body 11 is formed to have a substantially L-shaped cross section by an upper surface portion 11a (see FIG. 3) forming a portion corresponding to the upper panel portion 1a and a rear portion 11b (see FIG. 1) forming a portion corresponding to the lower panel portion 1b. ing. A rectangular fitting opening 13 is formed in the vicinity of the rear end of the upper surface portion 11a of the base material body 11 on the left side of the center in the vehicle width direction. A recess 11c is formed along the entire periphery of the base material body 11 around the fitting opening 13, the recess 11c being recessed downward from the outer peripheral side thereof. An airbag chute member 15 injection-molded from an elastomer resin material such as thermoplastic olefin (TPO) is fitted into the fitting opening 13 from the front side of the base material body 11 to constitute a part of the base material 3 . there is

The airbag chute member 15 is a cylindrical member in which an airbag 17 and an airbag device 19 comprising an inflator (not shown) and the like are housed to protect the occupant in the front passenger seat from impacts in the longitudinal direction of the vehicle body. A frame body portion 21 is provided, and the frame body portion 21 includes a front frame wall 21a extending in the vehicle width direction, a rear frame wall 21b arranged to face the rear side of the front frame wall 21a and extending in the vehicle width direction, A left frame wall (not shown) extending substantially in the longitudinal direction of the vehicle so as to connect the left edges of the front frame wall 21a and the rear frame wall 21b, and a left frame wall (not shown) extending substantially in the longitudinal direction of the vehicle so as to connect the right edges thereof. and a right frame wall 21c. The vehicle body front-rear center portions of the left frame wall and the right frame wall 21c extend in the vehicle body front-rear direction, while the vehicle body front-rear end portions of the left frame wall and the right frame wall 21c incline outward in the vehicle width direction toward the vehicle body front-rear end sides. are doing. Engagement protrusions 22 are provided near the upper end portions of the front frame wall 21a and the rear frame wall 21b.

The front frame wall 21a and the rear frame wall 21b are formed with a plurality of hanging holes 23 (one appears in each of FIG. 3) spaced apart in the width direction of the vehicle. A plurality of hooks 25 (one each appears in FIG. 3) are inserted into the hooking holes 23. As shown in FIG. When the airbag device 19 is activated, the hook 25 is caught by the periphery of the hooking hole 23 so that only the airbag door 51 (to be described later) is pushed upward by the airbag 17 . In FIG. 3, 27 is a bracket for fixing the airbag device 19 to an instrument panel reinforcement (not shown) bridged over the side panels of the vehicle body.

A flange portion 28 is integrally formed on the outside of the upper end portion of the frame portion 21 over the entire circumference so as to protrude outward. As shown in FIG. 4, projecting ridges 29 extending in the longitudinal direction of the vehicle body protrude near the outer peripheral ends of the rear surfaces of the flanges 28 on both sides in the vehicle width direction of the frame body 21 . Further, on the back surface of the flange portion 28, a plate-like reinforcing rib 30 with its plate surface directed in the longitudinal direction of the vehicle body connects the projecting portion 29 with the left frame wall (not shown) and the right frame wall 21c. It is protruding like this.

In a state in which the airbag chute member 15 is fitted into the fitting opening 13 from the front side of the base material 3, the flange portion 28 is overlapped with the recess 11c of the base body 11 from the front side, and the engaging projection 22 is moved from the front side. The airbag chute member 15 is supported by the base material body 11 by being engaged with the periphery of the fitting opening 13 from below. In addition, the front frame wall 21a, the rear frame wall 21b, and both of the ridges 29 face the inner peripheral end surface of the fitting opening 13 from the inside with a small gap therebetween. In this state, the peripheral portion of the fitting opening 13 of the base body 11 and the flange portion 28 of the airbag chute member 15 are adhered to each other by a seal tape (not shown).

Inside the upper end portion of the frame portion 21 , a plate-like flap portion 31 whose plate surface is directed substantially vertically is integrally formed so as to close the upper end side inside the frame portion 21 . On the rear surface of the flap portion 31, a central groove 33a having a V-shaped cross section extending substantially linearly in the vehicle width direction at the front-rear center of the flap portion 31, and substantially forward grooves extending from both ends of the central groove 33a so as to face each other. and a pair of rear side grooves 33c having a V-shaped cross section extending substantially rearward from both ends of the central groove 33a so as to face each other. It is formed so that it does not reach the surface. The base ends of the front side grooves 33b and the rear side grooves 33c extend substantially straight from both ends of the central groove 33a at right angles to the central groove 33a. The front end portion of the groove forms a substantially linear inclined groove 33d that is inclined outward in the vehicle width direction toward the front end side. The front side groove 33b and the rear side groove 33c are located on the outer peripheral portion of the rear surface of the flap portion 31. As shown in FIG.

A thin portion of the flap portion 31 corresponding to the central groove 33a forms a substrate central tear line 35a extending substantially linearly in the vehicle width direction. In addition, the thin portions corresponding to the front side grooves 33b of the flap portion 31 constitute base material front side tear lines 35b that extend substantially forward from both ends of the base material central tear line 35a so as to face each other, and the flaps are formed. The thin portions corresponding to the rear side grooves 33c of the portion 31 form substrate rear side tear lines 35c extending substantially rearward from both ends of the substrate central tear line 35a so as to face each other. The base material center tear line 35 a , the base material front side tear line 35 b , and the base material rear side tear line 35 c constitute the planned base material breaking line 35 . At the front end of the substrate front side tear line 35b and the substrate rear side tear line 35c, an inclined line 35d is formed by a thin portion corresponding to the inclined groove 33d.

A front concave portion 37a extending in the vehicle width direction is formed at the end portion of the back surface of the flap portion 31 on the front side frame wall 21a side, and a thin portion corresponding to the front side concave portion 37a in the flap portion 31 extends in the vehicle width direction. It constitutes a substrate front side hinge portion 39a that extends substantially linearly. Both ends of the substrate front side hinge portion 39a coincide with the tips of both substrate front side tear lines 35b. A rear recessed portion 37b extending in the vehicle width direction is formed at the end portion of the rear side frame wall 21b side of the rear surface of the flap portion 31, and a thin portion of the flap portion 31 corresponding to the rear recessed portion 37b is formed in the vehicle. It constitutes a substrate rear side hinge portion 39b that extends substantially linearly in the width direction. Both ends of the substrate rear side hinge portion 39b coincide with the tips of both substrate rear side tear lines 35c.

A region surrounded by the substrate center tear line 35a and both substrate front side tear lines 35b in the substrate breaking projected line 35 of the substrate 3 constitutes the substrate front side opening operation planned region 41a, Of the planned substrate breaking line 35 of the substrate 3, a region surrounded by the substrate center tear line 35a and both substrate rear side tear lines 35c constitutes the substrate rear side opening operation planned region 41b. there is

The cushion layer 7 is made of urethane foam or the like, and has, for example, a semi-rigid structure in which independent foams and open foams are distributed about half each. The thickness T of the cushion layer 7 is set at approximately 5.5 mm.

The skin 9 is formed by slush molding or vacuum molding with a resin material having higher wettability than the base material 3, such as an elastomer resin material such as thermoplastic urethane (TPU) or polyvinyl chloride (PVC). The bonding strength between the cushion layer 7 and the skin 9 is set higher than the bonding strength between the base material 3 and the cushion layer 7 . On the back surface of the outer skin 9, a central notch 43a having a V-shaped cross section extending substantially linearly in the vehicle width direction at the front-rear center of the vehicle body in the region overlapping the flap portion 31, and from both ends of the central notch 43a, forward A pair of front side cutouts 43b having a V-shaped cross section extending substantially linearly so as to be inclined outward in the vehicle width direction toward A pair of rear side cutouts 43c having a V-shaped cross section extending substantially linearly so as to be inclined are formed so as not to reach the surface.

A thin portion of the skin 9 corresponding to the central notch 43a forms a skin center tear line 45a extending substantially linearly in the vehicle width direction. Further, a pair of skins extending forward in a substantially straight line from both ends of the skin center tear line 45a by thin portions corresponding to the front side notch portions 43b of the skin 9 so as to be inclined outward in the vehicle width direction. A front side tear line 45b is formed, and a thin portion corresponding to the rear side cutout 43c of the skin extends from both ends of the skin center tear line 45a so as to be inclined rearward and outward in the vehicle width direction. A pair of extending skin rear side tear lines 45c are formed. The epidermis center tear line 45 a , the epidermis front side tear line 45 b and the epidermis rear side tear line 45 c constitute the planned epidermis breaking line 45 .

The base material center tear line 35a and the skin center tear line 45a overlap each other with the cushion layer 7 interposed therebetween. In addition, the portions of both skin front side tear lines 45b excluding the proximal ends and the distal ends are located outside the base material front side tear lines 35b, and the portions excluding the proximal ends and distal ends of both skin rear side tear lines 45c. are located outside the rear side tear line 35c of both substrates. In addition, the base ends of both base material front side tear lines 35b and the base ends of both base material front side tear lines 45b overlap each other with the cushion layer 7 interposed therebetween. The base end of the skin rear side tear line 45c overlaps with the cushion layer 7 interposed therebetween. The inclined lines 35d of the both substrate front side tear lines 35b approach the both skin front side tear lines 45b toward the tip side, and the tips of the both substrate front side tear lines 35b and the tips of both the skin front side tear lines 45b. are overlapped with each other with the cushion layer 7 interposed therebetween. The inclined lines 35d of the rear side tear lines 35c of both substrates approach the rear side tear lines 45c of both substrates toward the tip side, and the tips of the rear side tear lines 35c of both substrates and the rear side tear lines of both substrates are aligned. The ends of the lines 45c overlap each other with the cushion layer 7 interposed therebetween.

In addition, the area surrounded by the epidermis center tear line 45a and both the epidermis front side tear lines 45b of the epidermis 9 projected line 45 constitutes the epidermis front side opening operation planned area 47a, and the epidermis rupture in the epidermis 9 Of the planned line 45, a region surrounded by the skin center tear line 45a and both the skin rear side tear lines 45c constitutes the skin rear side opening operation planned region 47b. In addition, a pad front side opening operation scheduled area 49 a is formed by the area 47 a of the skin 9 scheduled to be opened to the front side of the skin and the area of the cushion layer 7 overlapping with the scheduled area 47 a of the skin front side to be opened. The planned region 47b and the region of the cushion layer 7 that overlaps with the planned region 47b for the skin rear side opening operation constitute a pad rear side opening planned region 49b.

A front door portion 51a is formed by the base material front side opening operation scheduled area 41a of the base material 3 and the pad front side opening operation scheduled area 49a of the pad 5. As shown in FIG. Further, the rear door portion 51b is composed of the base material rear side opening operation scheduled region 41b of the base material 3 and the pad rear side opening operation scheduled region 49b of the pad 5. As shown in FIG. The front door portion 51a and the rear door portion 51b share the substrate center tear line 35a and the skin center tear line 45a. The front side door portion 51a and the rear side door portion 51b constitute a so-called seamless type airbag door 51 that can be double-opened, in which the planned base material breakage line 35 and the planned skin breakage line 45 cannot be seen from the front side.

In the instrument panel 1 configured as described above, the skin 9 is set in a first mold (not shown) and the base material 3 is set in a second mold (not shown), and then the first mold and the second mold are closed. In this state, a foamed resin material such as urethane foam is injected between the skin 9 and the base material 3 and foamed and cured to form the cushion layer 7 . Since the skin 9 is made of a material with better wettability than the base material 3, the bonding strength between the cushion layer 7 and the skin 9 is higher than the bonding strength between the base material 3 and the cushion layer 7. - 特許庁

In the instrument panel 1 configured as described above, when the airbag 17 of the airbag device 19 is inflated by the activation of the inflator, the expansion pressure presses the airbag door 51 upward, thereby As shown in FIGS. 5 and 6, the planned breaking line 35 is broken, and as shown in FIG. 5 and FIG. 3, the base material rear side opening operation planned region 41b rotates rearward and upward with the base material rear side hinge portion 39b as a fulcrum. In addition, the projected skin breaking line 45 of the skin 9 is also pulled by the substrate front side opening operation scheduled region 41a and the substrate rear side opening operation scheduled region 41b of the substrate 3 and is broken, and the pad front side opening operation scheduled region 49a of the pad 5 is broken. rotates forward and upward together with the substrate front side opening operation scheduled region 41 a of the substrate 3 , and the pad rear side opening operation scheduled region 49 b of the pad 5 is also the substrate rear side opening operation scheduled region of the substrate 3 . 41b and rotates backward and upward. That is, the front door portion 51a opens forward and upward, and the rear door portion 51b opens rearward and upward. At this time, the base material 3 in the vicinity of the tip of the base material front side tear line 35b overlaps from the back side on both corners of the skin front side opening operation scheduled region 47a of the skin 9 on the anti-skin central tear line 45a side to reinforce the skin 9. Therefore, even if the physical properties of the skin 9 of the airbag door 51 deteriorate due to aging or the like, the corner of the skin front side opening operation scheduled region 47a of the skin 9 on the side opposite to the skin center tear line 45a is broken. Not easy to scatter. Similarly, the base material 3 in the vicinity of the tip of the base material rear side tear line 35c overlaps with both corners of the skin rear side opening operation planned region 47b of the skin 9 from the back side on the side opposite to the skin central tear line 45a side. is reinforced, even if the physical properties of the skin 9 of the airbag door 51 deteriorate due to secular changes, etc., the corner of the skin 9 on the anti-skin center tear line 45a side in the skin rear side opening operation region 47b is Hard to break and scatter.

In addition, the skin front side tear line 45b and the skin rear side tear line 45c are formed at an obtuse angle with respect to the skin center tear line 45a on the side of the skin front side opening operation planned region 47a side and on the side of the skin rear side opening operation planned region 47b side. Therefore, the breaking force of the skin center tear line 45a is smoothly transmitted to both the skin front side tear lines 45b and both the skin rear side tear lines 45c, compared to the case where the skin center tear line 45a is provided at right angles to the skin center tear line 45a. Cheap. Therefore, even if the physical properties of the skin of the airbag door 51 deteriorate due to secular change, etc., only the scheduled skin breakage line 45 can be reliably broken, and the front side tear line 45b and the rear side tear line 45c of the skin can be reliably broken. It is possible to prevent the outer skin 9 around the proximal end from breaking.

In addition, since the bonding force between the cushion layer 7 and the skin 9 is set higher than the bonding force between the base material 3 and the cushion layer 7, the base material 3 in the skin front side opening operation scheduled region 47a of the skin 9 is A portion that does not overlap with the material front side opening operation scheduled region 41a and a portion of the skin rear side opening operation scheduled region 47b that does not overlap with the base material rear side opening operation scheduled region 41b of the base material 3 overlap with the cushion layer 7 to form the cushion. Easy to open while being reinforced by layer 7. Therefore, when the airbag door 51 is operated to open, the portion of the skin front side opening operation scheduled region 47a of the skin 9 that does not overlap with the substrate front side opening operation scheduled region 41a of the base material 3 and the base of the skin rear side opening operation scheduled region 47b. It is possible to prevent the part of the material 3 which does not overlap with the substrate rear side opening operation planned region 41b from being broken and scattered.

In addition, since the expansion pressure of the airbag 17 is distributed to the front door portion 51a and the rear door portion 51b, the stress generated in the outer skin 9 is reduced compared to the case where the pressure is applied intensively to one door portion. can. Therefore, it is possible to suppress the breakage of the skin 9 at a portion other than the projected skin breakage line 45 .

In addition, since the base ends of the base material front side tear line 35b and the base material rear side tear line 35c are provided so as to extend in the longitudinal direction of the vehicle body, compared to the case where they are provided on the extension line of the inclined line 35d, the base material front side tear line 35b and the base material rear side tear line 35c are arranged on the extension line of the base material front side. The base ends of the side tear line 35b and the side tear line 35c on the rear side of the substrate can be arranged on the outside in the vehicle width direction. Therefore, the substrate front side opening operation planned region 41a and the substrate rear side opening operation planned region 41b can be widened.

Further, the portion of the skin front side opening operation scheduled region 47a of the skin 9 that does not overlap with the base material front side opening operation scheduled region 41a of the base material 3 is the end of the base material center tear line 35a of the base material 3 and the base material front side tear line. Since it does not protrude outside the straight line connecting the tip of 35b, it is difficult to scatter. Similarly, the portion of the skin rear side opening operation scheduled region 47b of the skin 9 that does not overlap with the substrate rear side opening operation scheduled region 41b of the substrate 3 is the terminal of the substrate center tear line 35a of the substrate 3 and the substrate rear side opening operation scheduled region 47b. Since it does not protrude outside the straight line connecting the tip of the side tear line 35c, it is difficult to scatter.

In the above embodiment, the distance between the base ends of the front side tear lines 35b of both substrates and the base ends of the front side tear lines 45b of both skins is set to 0 mm when viewed from the front and back directions, but the cushion layer when viewed from the front and back directions. 7, and may be a value that exceeds 0 mm. Similarly, the distance between the base ends of the rear side tear lines 35c of both base materials and the base ends of the rear side tear lines 45c of both skins is set to be equal to or less than the thickness T of the cushion layer 7 and 0 mm when viewed from the front and back directions. It may be a value exceeding the value.

In the above-described embodiment, the distance between the tip of the front side tear line 35b of both substrates and the tip of the front side tear line 45b of both skins was set to 0 mm when viewed from the front and back direction. The value may be equal to or less than the thickness T and exceed 0 mm. Similarly, the distance between the tip of the rear side tear line 35c of the base material and the tip of the rear side tear line 45c of both skins is set to a value equal to or less than the thickness T of the cushion layer 7 and exceeding 0 mm when viewed from the front and back directions. good too.

Further, in the above-described embodiment, the substrate center tear line 35a and the skin center tear line 45a are provided so as to extend in the vehicle width direction, and the skin front side tear line 45b and the skin rear side tear line 45c are provided in one direction in the vehicle longitudinal direction. inclined outward in the vehicle width direction. However, the skin front side tear line 45b and the skin rear side tear line 45c are arranged outward in the first direction toward the second direction perpendicular to the first direction in which the substrate center tear line 35a and the skin center tear line 45a extend. , the extending direction of the substrate center tear line 35a, the skin center tear line 45a, the skin front side tear line 45b, and the skin rear side tear line 45c may be set in another direction.

Further, in the above-described embodiment, the central cutout portion 43a, the front side cutout portion 43b, and the rear side cutout portion 43c having a V-shaped cross section are formed on the estimated skin breaking line 45 of the skin 9. may be formed by

Further, the adhesive force between the skin 9 and the cushion layer 7 may be enhanced by applying a primer to the surface of the skin 9 to be adhered to the cushion layer 7 . As a result, the bonding strength between the cushion layer 7 and the outer skin 9 can be reliably made higher than the bonding strength between the base material 3 and the cushion layer 7 .

In addition, the left frame wall and the right frame wall 21c of the frame body portion 21 are provided on a straight line connecting the tip of the substrate front side tear line 35b and the tip of the substrate rear side tear line 35c, Side recesses extending in the longitudinal direction of the vehicle body may be provided at the end on the left frame wall side and the end on the right frame wall 21c side of the rear surface, and thin portions corresponding to the side recesses may constitute side hinge portions. good. As a result, the substrate 3 on the left outer side of the left substrate front side tear line 35b and the left substrate rear side tear line 35c, the left skin front side tear line 45b and the left skin rear side tear line 45c. The left outer skin 9 forms a left door portion that is opened by rotating upward to the right around the left side hinge portion by the inflation pressure of the airbag 17 . In addition, the substrate 3 on the right outer side of the right substrate front side tear line 35b and the right substrate rear side tear line 35c, and the right skin front side tear line 45b and the right skin rear side tear line 45c. Together with the outer skin 9 on the right side, a right side door portion is configured to open by rotating upward to the left side around the right side hinge portion by the inflation pressure of the airbag 17 . An airbag door 51 is composed of four door portions, namely, the front door portion 51a, the rear door portion 51b, the left door portion, and the right door portion.

Further, in the above embodiment, the base material 3 is composed of two members, the base material body 11 and the airbag chute member 15, but may be composed of one member.

Further, although the present invention is applied to the instrument panel 1 in the above embodiment, the present invention can also be applied to interior panels other than the instrument panel 1.

INDUSTRIAL APPLICABILITY The present invention is useful as an airbag door formed on an interior panel having a substrate, a cushion layer bonded to the surface of the substrate, and a skin bonded to the surface of the cushion layer.

1 Instrument panel (interior panel)
3 base material
7 cushion layer
9 epidermis
17 Airbag
35 base material fracture planned line
35a substrate center tear line
35b base material front side tear line
35c Substrate rear side tear line
35d inclined line
41a Base material front side opening operation planned area
41b Substrate rear side opening operation planned region
45 Planned line of epidermal rupture
45a epidermis central tear line
45b Skin front side tear line
45c posterior side tear line of epidermis
47a Epidermal anterior side opening planned region
47b Epidermal posterior side opening planned region
51 airbag door
51a front door part
51b rear door portion T thickness

Claims (2)

An interior panel (1) comprising a substrate (3), a cushion layer (7) bonded to the surface of the substrate (3), and a skin (9) bonded to the surface of the cushion layer (7). and is provided with at least one door portion (51a, 51b), the door portion (51a, 51b) being a base surrounded by a planned base material breaking line (35) in the base material (3). The airbag (17) has a planned material opening region (41a, 41b) and a planned skin opening region (47a, 47b) surrounded by a planned skin breaking line (45) in the skin (9). An airbag door that is opened by rupturing the planned base material breakage line (35) and the planned skin breakage line (45) by inflation pressure,
The planned substrate breakage line (35) is composed of a substrate center tear line (35a) extending substantially linearly in a predetermined first direction, and a substrate center tear line (35a) extending from both ends of the substrate center tear line (35a) so as to face each other. A pair of base material side tear lines (35b, 35c) extending from the base material side tear lines (35b, 35c). An inclined line (35d) is formed to
The planned skin breaking line (45) is composed of a center skin tear line (45a) extending substantially linearly in the first direction, and a center tear line (45a) extending perpendicular to the first direction from both ends of the center skin tear line (45a). a pair of skin side tear lines (45b, 45c) extending toward one side in the second direction so as to be inclined outward in the first direction;
The base material central tear line (35a) and the skin central tear line (45a) overlap each other with the cushion layer (7) interposed therebetween,
Parts of the skin side tear lines (45b, 45c) excluding base ends and tips are located outside the base material side tear lines (35b, 35c),
The distance between the base ends of the base material side tear lines (35b, 35c) and the base ends of the skin side tear lines (45b, 45c) is equal to the thickness (T) of the cushion layer (7) when viewed from the front and back directions. is set to
The inclined lines (35d) of the base material side tear lines (35b, 35c) approach the skin side tear lines (45b, 45c) toward the distal end side, and the base material side tear lines (35b, 35c) approach. The distance between the tip and the tip of the skin side tear line (45b, 45c) is set to be equal to or less than the thickness (T) of the cushion layer (7) when viewed from the front and back directions ,
An airbag door characterized in that the bonding strength between the cushion layer (7) and the skin (9) is set higher than the bonding strength between the base material (3) and the cushion layer (7). . The airbag door of claim 1 , comprising:
An airbag door, characterized in that the two door portions (51a, 51b) sharing the substrate center tear line (35a) and the skin center tear line (45a) are configured to be double-opening.

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