JP2021115919A - Air bag cover - Google Patents

Abstract

To provide an air bag cover capable of stably breaking a surface layer along a tear part at the time of breaking the tear part of a substrate.SOLUTION: An air bag cover comprising a substrate 21 and a surface layer 32 adhered to a front side of the substrate 21 covers a folded air bag 11, forms a projecting opening 60 by breaking a tear part 40 configured by arranging a recess 40a recessed from a rear side to a front side of the substrate by an inflated air bag, and projects the air bag from the projecting opening. The surface layer 32 is adhered to the substrate 21 and arranged by enhancing the adhesive strength to the substrate 21, of recess vicinity areas 54 at both sides just above the recess 40a of the tear part 40 more than of a recess arrangement area 52 just above the recess 40a, and peripheral edge areas 56 in the peripheries of the recess vicinity areas 54.SELECTED DRAWING: Figure 2

Description

The present invention is used in an airbag device provided with an airbag that inflates to protect an occupant or the like, covers the folded airbag, and forms a protrusion opening when the airbag is inflated to form air. The present invention relates to an airbag cover having a structure in which the bag is projected.

Conventionally, an airbag cover arranged on an instrument panel of a vehicle is folded so as to have a base material made of synthetic resin made of polypropylene or the like and a skin layer adhered to the surface side of the base material. The airbag is covered and an opening for protrusion is formed by the expanding airbag so that the airbag protrudes from the opening for protrusion (see, for example, Patent Document 1). The epidermis layer was composed of an epidermis main body made of a polyolefin-based thermoplastic elastomer or the like and a foam layer (cushion layer) made of urethane or the like to which the epidermis main body was adhered. The protrusion opening is formed by breaking a tear portion formed by arranging recesses recessed from the back surface side to the front surface side of the base material, and the recess portion of the tear portion has a single character shape in the center when viewed from above. Both ends were Y-shaped, which spread in a V shape from both ends of the site. In this tear part, at the time of breakage, a pair of front and rear central door parts on both sides of the central one-letter part and a pair of left and right triangular plate-shaped triangular doors at both ends of the central one-letter part were configured to open. .. Then, in order to facilitate the breakage of the epidermis layer at the time of forming the protrusion opening so as to provide a difference in the adhesive strength of the epidermis layer to the base material, the vicinity of the upper part of the recess of the base material is set to a low adhesive force, and both sides thereof are set. The skin layer was adhered to the base material as a high adhesive strength. That is, in the area of the epidermis layer having a high adhesive force to the base material, since it does not shift with respect to the base material, it becomes difficult to stretch and break, and conversely, in the area of the epidermis layer having a low adhesive force to the base material. Since the epidermis layer is easily stretched, it becomes thin and easily breaks together with the tear portion of the base material. Therefore, in this airbag cover, when the airbag is expanded, the tear portion of the base material is broken, the pair of front and rear central door portions are opened, and the pair of left and right triangular door portions are opened. At that time, the skin layer is also adhered. By breaking near the upper part of the recess of the low adhesive force substrate near the high force region, the airbag cover forms a protrusion opening, and the airbag protrudes from this protrusion opening. Was there.

Japanese Unexamined Patent Publication No. 2012-176663

However, in the conventional airbag cover, the region where the adhesive force of the epidermis layer to the base material is lowered is more than twice the width dimension of the region where the adhesive force of the epidermis layer is increased to the base material, so that the width dimension is wide. Therefore, it is difficult to stabilize the break line of the epidermis layer, and a part of the epidermis layer may be scattered at the time of breakage, and there is room for improvement.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an airbag cover capable of stably breaking the epidermis layer along the tear portion when the tear portion of the base material is broken. ..

The airbag cover according to the present invention has a structure including a base material and a skin layer adhered to the surface side of the base material, and the folded airbag is covered and expanded by the airbag. An airbag cover having a structure in which a fore portion formed by arranging recesses recessed from the back surface side to the front surface side of the base material is broken to form a protrusion opening, and the airbag is projected from the protrusion opening. And
With respect to the base material, the epidermis layer forms a recess-prone region on both sides of the tear portion immediately above the recess from the recess-arranged region directly above the recess and the peripheral peripheral region around the recess-near region. It is characterized in that it is adhered to and arranged on the base material with improved adhesive strength.

In the airbag cover according to the present invention, when the tear portion of the base material is broken by being pushed by the expanding airbag, the concave portion arrangement region of the epidermis layer immediately above the concave portion of the tear portion is from the region near the adjacent concave portion. Since the adhesive force to the base material is low, the area that stretches with respect to the base material and becomes thin so that it is easily broken, and the thinned area is a region with a narrow width dimension near directly above the recess. Since stress is easily concentrated, scattering of the epidermis layer is prevented, and the fracture occurs quickly while matching the fracture line of the tear portion of the base material. Of course, the region near the concave portion having a high adhesive strength is adjacent to the concave portion arrangement region, but the peripheral edge region having a low adhesive strength similar to the concave portion arrangement region is arranged on the peripheral edge thereof. Adhesive strength is not increased over the entire area of the epidermis layer adjacent to the recessed area. Therefore, it is only necessary to increase the adhesive force of the epidermis layer to the base material in the region near the recess as compared with other recessed regions and peripheral regions, and the epidermis layer can be easily adhered to the base material. It will be possible.

Therefore, in the airbag cover according to the present invention, when the tear portion of the base material is broken, the epidermis layer can also be stably broken along the tear portion.

In the airbag cover according to the present invention, the adhesive tape is attached to the recessed region, and the recessed region has a higher adhesive strength than the recessed region and the peripheral region. desirable.

In such a configuration, when the skin layer is adhered to the base material, it is only necessary to attach an extra adhesive tape to the region near the recess, so that the work of adhering the skin layer to the base material can be easily performed. It can be carried out.

In the airbag cover according to the present invention, the recesses of the tear portion provided on the base material are arranged as Y-shaped ends that expand in a V shape from both ends of the central one-letter-shaped portion when viewed from above. Alternatively, they may be arranged in a substantially H shape when viewed from above. By the way, if the recesses are arranged in a Y-shape at both ends that expand in a V shape from both ends of the central one-letter-shaped part when viewed from above, a pair of recesses on both sides of the central one-letter-shaped part. The central door portion and the pair of triangular plate-shaped triangular door portions at both ends of the central one-letter-shaped portion are opened to form a protrusion opening, which is arranged in a substantially H shape when viewed from above. If this is done, the door portions on both sides of the substantially H-shaped horizontal bar portion between the substantially H-shaped vertical bar portions are opened like a Kannon door to form a protruding opening.

Further, in the airbag cover according to the present invention, the skin layer is configured to include a fabric disposed on the surface side and a sheet-shaped cushion layer to which the fabric is adhered.
It is desirable that the fabric is provided with a strength-reducing processed portion for promoting breakage of the skin layer on the back surface side of the recessed arrangement region.

In such a configuration, even if the fabric of the epidermis layer is a material that is difficult to break smoothly, the processed portion for reducing the strength in which stress is easily concentrated can be used as the starting point of the breakage of the epidermis layer and the guidance of the propagation of the breakage. , The protrusion opening in the epidermis layer can be formed smoothly. Further, since the fabric made of woven fabric or knitted fabric is arranged on the surface side of the skin layer, it is possible to improve the tactile sensation and design of the airbag cover.

Further, in the airbag cover according to the present invention, the recesses of the tear portion are arranged in a substantially H shape when viewed from above, and the skin layer is arranged on the surface side of the fabric. When the fabric is configured to include a sheet-shaped cushion layer to which the fabric is adhered, and the fabric is provided with a strength-reducing processed portion for promoting breakage of the skin layer on the back surface side. In the above, a plurality of the processed portions are arranged along the substantially H-shaped horizontal bar portion of the concave portion and in the vicinity of directly above the substantially H-shaped horizontal bar portion of the concave portion, including the inside of the concave portion arrangement region. It may be provided as a configuration.

In such a configuration, if the processing portion for reducing the strength is arranged along the substantially H-shaped horizontal bar portion of the tear portion and the skin layer is adhered to the surface side of the base material, the tear Even if the machined portion for strength reduction is not accurately placed at the position directly above the horizontal bar portion of the portion (center in the width direction of the recess), the vicinity of directly above the horizontal bar portion of the tear portion (near the center in the width direction of the recess). Therefore, any of the processed portions for reducing the strength can be arranged in the recessed arrangement region). Therefore, when the tear portion of the base material is broken and the door portion is pushed open due to the expansion of the airbag, the strength of the epidermis layer in the vicinity of the horizontal bar portion of the tear portion (inside the recessed arrangement region) is reduced. The processed portion of the above can easily concentrate stress and easily break, and the breakage of the epidermis layer can be propagated quickly and smoothly. That is, even if the processed portion for reducing the strength of the epidermis layer is not accurately and accurately arranged at the position directly above the horizontal bar portion of the tear portion (center in the width direction of the recess), the epidermis layer is smoothly arranged when the airbag is inflated. Since it can be broken to form a projecting opening and the airbag can be projected from the projecting opening, the alignment of the epidermis layer on the substrate can be easily performed.

In addition, the vertical bar portion of the tear portion is in a state orthogonal to a plurality of processed portions for reducing strength, but the region adjacent to both sides of the vertical bar portion of the tear portion provides the adhesive strength of the epidermis layer to the base material. It is a region near the recess to be enhanced and adhered, and at the recessed portion of the vertical bar portion of the tear portion in the epidermis layer, it follows the breakage of the vertical rod portion of the tear portion and crosses the parallel processed portion for strength reduction. At the same time, since the epidermis layer is broken, it is possible to smoothly form the protrusion opening while preventing the epidermis layer from scattering.

Further, in the case of an airbag cover in which the recesses of the tear portion are arranged in a substantially H shape when viewed from above, the strength reducing processed portion may be arranged in a grid pattern.

That is, the processed portion for reducing the strength on the back surface side of the fabric is arranged in the recessed portion in the vicinity of directly above the substantially H-shaped horizontal bar portion of the recess and in the vicinity of directly above the substantially H-shaped vertical bar portion of the recess. A plurality of laterally processed portions along the substantially H-shaped horizontal bar portion of the recess and a plurality of vertically processed portions along the substantially H-shaped vertical bar portion of the recess are arranged side by side, including the inside of the region. It may be arranged in a grid pattern.

In such a configuration, in addition to the strength reduction processing portion (horizontal processing portion) along the substantially H-shaped horizontal bar portion of the tear portion, the strength reduction processing portion along the substantially H-shaped vertical bar portion of the tear portion is used. Since the processed parts (vertical processing parts) are also arranged side by side, even if the door parts on both sides of the substantially H-shaped horizontal bar part are opened due to the breakage of the tear part of the base material, the side of the tear part Within the recessed arrangement region corresponding to the rod portion and the vertical rod portion, the laterally processed portion substantially parallel to the portion at the tip of the door portion in the epidermis layer and the portion substantially parallel to the portions on both edge sides of the door portion. Both the vertically processed parts can be smoothly broken, and the base material and the skin layer are smoothly broken so that the breaking lines are aligned with each other, and the door part is opened to form a protrusion. The opening shape of the opening can be stabilized, and the protruding shape of the airbag can be stabilized.

It is a schematic perspective view of the airbag device which uses the airbag cover of one Embodiment which concerns on this invention. It is a schematic vertical sectional view of the airbag device of an embodiment. It is a schematic vertical sectional view which shows the strength reduction processing part provided in the skin layer of the airbag cover of embodiment. It is the schematic plan view which shows the tear part in the airbag cover of embodiment. It is a schematic perspective view which shows the state which formed the opening for protrusion of the airbag cover of an embodiment. It is the schematic plan view which shows the airbag cover of the modification of embodiment. It is a schematic perspective view which shows the state which the airbag cover of the modification shown in FIG. 6 formed the opening for protrusion. It is schematic cross-sectional view which shows the tear part in the airbag cover of another modification of embodiment. It is a schematic plan view of the airbag cover shown in FIG. It is a schematic plan view which shows the airbag cover of still another modification of embodiment. It is a schematic vertical sectional view of the airbag cover of still another modification of the embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the airbag cover 20 of the embodiment is arranged on the instrument panel (instrument panel) 2 of the vehicle 1. It is used in the airbag device 10 for the passenger seat. The instrument panel 2 is arranged on the front side of the front seat of the vehicle 1, and is provided on the driver's seat side 2a on the front side of the driver's seat, the passenger seat side 2b in front of the passenger seat, and the front side of the center console (not shown). An airbag that is configured to include a central portion 2c and forms a protrusion opening 60 so that the portion of the passenger seat side portion 2b is smoothly projected when the airbag 11 (see FIG. 2) is inflated. It is configured as a part of the cover 20.

As shown in FIG. 2, the airbag device 10 is expanded from the case 15 as a storage portion through the protrusion opening 60 so as to allow the expansion gas G to flow in and protect the passenger in the passenger seat. The protruding airbag 11, the inflator 14 that supplies the expansion gas G to the airbag 11, the airbag cover 20 that covers the folded and stored airbag 11, and the airbag 11 and the inflator 14 are stored and held. Case 15 and the case 15 are provided. The case 15 is connected to the body side of the vehicle 1 by a bracket (not shown), and the instrument panel 2 provided with the airbag cover 20 holds the vicinity of the outer peripheral edge and the like on the body side of the vehicle 1 and the airbag cover 20. The case side portion 25, which will be described later, is connected to the side wall portion 17 of the case 15.

The airbag 11 has a substantially quadrangular pyramid shape whose rear end is tapered toward the front side as a receiving surface for receiving passengers in the passenger seat, and the expansion gas G flows into the lower surface on the front end side. It is provided with an inflow opening 11a for allowing the inflow. The inflow opening 11a opens in a circular shape, and the peripheral edge of the inflow opening 11a is pressed by a substantially square annular retainer 12 arranged in the airbag 11 and attached to the bottom wall portion 16 of the case 15. ing. The retainer 12 has bolts 12a extending downward projecting from the four corners of a substantially square ring. Each bolt 12a penetrates the peripheral edge of the inflow opening 11a of the airbag 11, the bottom wall portion 16 described later of the case 15, and the flange portion 14c described later of the inflator 14, and the nut 13 is fastened. The airbag 11 and the inflator 14 are attached and fixed to the bottom wall portion 16 of the case 15.

The inflator 14 has a main body portion 14a having a substantially cylindrical shape and provided with a gas discharge port 14b for discharging the expansion gas G at the upper portion, and a flange portion protruding from the outer peripheral surface of the main body portion 14a and penetrating each bolt 12a of the retainer 12. It is configured to include 14c.

The case 15 includes a substantially rectangular plate-shaped bottom wall portion 16 and a substantially square tubular side wall portion 17 extending upward from the outer peripheral edge of the bottom wall portion 16. An insertion hole 16a for inserting the main body portion 14a of the inflator 14 from below is opened in the bottom wall portion 16, and a through hole (not shown in the figure) for penetrating each bolt 12a of the retainer 12 is provided on the peripheral edge of the insertion hole 16a. The peripheral edge of the inflow opening 11a of the airbag 11 and the flange portion 14c of the inflator 14 are attached and fixed to the bottom wall portion 16 of the case 15 by the bolt 12a and the nut 13 of the retainer 12. A locking hook 17a for locking the airbag cover 20 into a locking hole 26 of the case side portion 25, which will be described later, is formed on the side wall portion 17. A plurality of locking hooks 17a are arranged in front of and behind the side wall portion 17 and are arranged side by side in the left-right direction.

As shown in FIGS. 1 to 5, the airbag cover 20 includes a base material 21 and a skin layer 32 adhered to the surface side of the base material 21 using an adhesive. The base material 21 is made of a synthetic resin such as polypropylene. The base material 21 and the skin layer 32 are similarly arranged on the driver's seat side portion 2a and the central portion 2c of the instrument panel 2, but in the portion of the airbag cover 20 on the passenger seat side portion 2b, the case 15 and the case 15 are arranged. A connecting member 24 made of an olefin-based thermoplastic resin or the like to be connected is arranged.

The connecting member 24 has a substantially square tubular case side portion 25 arranged so as to surround the side wall portion 17 of the case 15, and a door side portion 28 (F, B, L) connected to the back surface side of the base material 21. , R) (see FIGS. 2 and 5). The case side portion 25 is formed with a locking hole 26 into which the previously described locking hook 17a of the case 15 is inserted into the front wall portion 25a and the rear wall portion 25b. The door side portions 28 (F, B) are separated from each other in the front-rear direction and welded to the back surface side of the central door portion 22 (F, B) described later of the base material 21. The door side portions 28 (L, R) are separated from each other to the left and right and welded to the back surface side of the triangular door portion 23 (L, R) described later of the base material 21. A plurality of ridge welded portions 28a are formed on the upper surface side of each door side portion 28, and the door side portion 28 is subjected to vibration welding to the central door portion 22 and the triangular door portion 23 by utilizing the welded portion 28a. It is welded to the back side of the door. Further, in the door side portion 28 (F, B, L, R), the door side portion 28 is located in the vicinity of the front wall portion 25a and the rear wall portion 25b of the case side portion 25, or the left and right side wall portions 25c. A thin hinge portion 29 is arranged so as to easily bend and open together with the 22 and 23.

The portion of the base material 21 where the connecting member 24 is arranged is opened so as to cover the folded airbag 11 and be pushed by the expanding airbag 11 to form a protruding opening 60 of the base material 21. Door portions 22 (F, B) and 23 (L, R) are arranged.

The protruding opening 60 of the base material 21 is formed by breaking the tear portion 40 provided on the peripheral edge of the door portions 22 (F, B) and 23 (L, R). The tear portion 40 has a one-letter-shaped portion 41 extending along the central left-right direction and a V-shaped portion 42 (L, R) extending in a V-shape from both ends of the one-letter-shaped portion 41 when viewed from above. A recess (substantially V-groove in the case of the embodiment) 40a, which is recessed from the back surface side to the front surface side of the base material 21, is formed so as to have a Y-shape at both ends. When the tear portion 40 is broken, the central door portions 22F and 22B on both front and rear sides of the single character portion 41 open on both front and rear sides, and the left and right triangular doors surrounded by the left and right V-shaped portions 42 (L, R). The portions 23L and 23R are configured to open on both the left and right sides. The door side portions 28 (F, B) of the connecting member 24 described above are welded to the back surface side of the central door portion 22 (F, B), and the triangular door portions 23L, 23R are already formed on the back surface side. The door side portions 28 (L, R) of the above-described connecting member are welded.

The skin layer 32 includes a fabric 33 as a skin disposed on the surface side and a sheet-shaped cushion layer 37 to which the fabric 33 is adhered. The fabric 33 is a woven fabric woven by using threads such as polyester for the warp VS and the weft HS. The cushion layer 37 is formed of a cushion material made of polypropylene or the like.

Then, although the skin layer 32 is adhered to the base material 21, the recessed vicinity regions 54 on both sides directly above the recessed portion 40a of the tear portion 40 are formed in the recessed portion arrangement region 52 directly above the recessed portion 40a and the recessed portion neighborhood region. The peripheral region 56 around the 54 is arranged so as to be adhered to the base material 21 with improved adhesive strength. In the case of the embodiment, the adhesive tape 50 is attached to the recessed area 54, and the recessed area 54 has higher adhesive strength than the recessed area 52 and the peripheral edge area 56.

In the recessed arrangement region 52, the width dimension WC (see FIG. 4) is set to 3 mm within a range of about 1 to 5 mm, assuming that the width dimension WC (see FIG. 4) is equivalent to the width dimension WT (see FIG. 2) of the recessed portion 40a of the tear portion 40. In the vicinity region 54, the width dimension WN (see FIG. 4) is made larger than the width dimension WC of the recessed arrangement region 52 (WN> WC) to be 10 mm within a range of about 3 to 15 mm.

Further, the fabric 33 of the embodiment is provided with a strength reducing processed portion 34 having a reduced wall thickness in order to promote breakage. In the case of the embodiment, the strength reducing processing portion 34 uses a milling, an ultrasonic cutter, a heated blade, or the like to reduce the cross-sectional area (to reduce the wall thickness) by means of a concave groove. It is formed. Such a processed portion 34 may be a notch or a recess because the tensile strength of the fabric 33 may be reduced in addition to the concave groove, and further, a part of the warp VS and the weft HS may be cut. , It may be made thinner by scraping or the like. Then, in the case of the embodiment, the strength lowering processing portion 34 is located in the vicinity of directly above the one-character-shaped portion 41 extending linearly in the left-right direction in the recess 40a of the tear portion 40 and in the vicinity of directly above the V-shaped portions 42L and 42R. And, respectively, they are arranged so as to be along the one-character-shaped portion 41 and the V-shaped portions 42L and 42R of the tear portion 40, respectively. In other words, the strength-reducing processed portion 34 is arranged near the center of the recessed arrangement region 52 in the width direction, and is arranged in a linear shape extending over the entire area of the recessed arrangement region 52. Of course, the strength lowering processing portion 34 is processed in consideration of the depth, the width dimension, and the like so as not to affect the design on the surface side of the fabric 33.

The recess 40a of the tear portion 40 has a width dimension WT (see FIG. 2) of about 3 mm within a range of about 1 to 5 mm, and the width dimension WM of the strength reducing processing portion 34 (see FIG. 3) is an embodiment. In the case of, the width dimension WT of the recess 40a is made smaller than the width dimension WT, and is set to about 1 mm within a range of about 0.5 to 3 mm.

In the airbag cover 20 of the embodiment, the fabric 33 provided with the processing portion 34 for reducing strength is adsorbed on the cushion layer 37 coated with the adhesive by vacuum forming to form the skin layer 32, and the adhesive is formed. The skin layer 32 is pressure-bonded to the base material 21 to which the adhesive tape 50 is attached. Then, the tear portion 40 is formed by end milling or the like, the door side portion 28 (F, B) of the connecting member 24 is welded to the central door portion 22 (F, B), and the door side portion 28 (L, R) is welded. Can be welded to the triangular door portions (L, R) to form an instrument panel 2 provided with an airbag cover 20.

After that, with the retainer 12 stored in the airbag 11, the airbag 11 is folded, the folded airbag 11 is wrapped with a wrapping material (not shown), and the airbag 11 is stored in the case 15. At this time, each bolt 12a of the retainer 12 projects downward from the bottom wall portion 16 of the case 15. Next, the main body portion 14a of the inflator 14 is inserted into the insertion hole 16a of the case 15 from below, each bolt 12a of the retainer 12 is passed through the flange portion 14c of the inflator 14, and the nut 13 is inserted into each bolt 12a. By fastening the above, the folded airbag 11 and the inflator 14 can be attached and fixed to the case 15.

After that, the instrument panel 2 is fixed to the vehicle 1, and the locking hook 17a of the case 15 is inserted and locked in the locking hole 26 of the case side 25 of the airbag cover 20 to extend an operation signal from a predetermined control device. The airbag device 10 can be mounted on the vehicle 1 by connecting a lead wire (not shown) for inputting the above to the inflator 14.

In the airbag device 10 mounted on the vehicle 1 in this way, if the inflator 14 operates so as to discharge the expansion gas G, the airbag 11 causes the expansion gas G to flow in and expands. Then, when the airbag 11 is expanded, the base material 21 breaks the tear portion 40 to open the central door portions 22F and 22B on both the front and rear sides of the one-character-shaped portion 41 in the tear portion 40, and the V-shape of the tear portion 40. The triangular door portions 23L and 23R surrounded by the shaped portions 42L and 42R are opened to open the protrusion opening 60, and the airbag 11 protrudes from the protrusion opening 60.

Then, in the airbag cover 20 of the embodiment, when the tear portion 40 of the base material 21 is broken by being pushed by the expanding airbag 11, the concave portion arrangement region of the skin layer 32 directly above the concave portion 40a of the tear portion 40. In 52, since the adhesive force to the base material 21 is lower than that of the adjacent recessed region 54, the region becomes thinner and thinner so that the base material 21 can be displaced and stretched and easily broken. Is easy to concentrate stress as a region of narrow width dimension WC near directly above the recess 40a, so that the stress can be quickly concentrated without scattering a part of the skin layer 32 while matching the breaking line 47 of the tear portion 40 of the base material 21. Breaks into. Of course, the recessed area 54 having a high adhesive force is adjacent to the recessed area 52, but a peripheral area 56 having a low adhesive force similar to the recessed area 52 is arranged on the periphery thereof. This does not mean that the adhesive strength is increased over the entire area of the epidermis layer 32 adjacent to the recessed arrangement region 52. Therefore, it is only necessary to increase the adhesive force of the epidermis layer 32 to the base material 21 as compared with the other recessed regions 52 and the peripheral region 56, and the epidermis layer 32 is simply based on the recessed region 54 alone. It can be adhered to the material 21.

Therefore, in the airbag cover 20 of the embodiment, when the tear portion 40 of the base material 21 is broken, the skin layer 32 can also be stably broken along the tear portion 40.

In the airbag cover 20 of the embodiment, the adhesive tape 50 is attached to the recessed area 54, and the recessed area 54 has a higher adhesive strength than the recessed area 52 and the peripheral edge area 56.

Therefore, in the embodiment, when the skin layer 32 is adhered to the base material 21, it is only necessary to additionally adhere the adhesive tape 50 to the region near the recess 54, so that the skin layer 32 is adhered to the base material 21. The work of making it can be easily performed.

When the adhesive tape 50 is not used, for example, when the skin layer 32 is adhered to the base material 21, the recessed arrangement region 52 and the peripheral region 56 are not coated with a primer that enhances the adhesive strength. A primer that enhances the adhesive strength may be applied only to the region near the recess 54 to adhere the skin layer 32 to the base material 21.

Further, in the airbag cover 20 of the embodiment, the skin layer 32 is configured to include the fabric 33 disposed on the surface side and the sheet-shaped cushion layer 37 to which the fabric 33 is adhered, and the fabric 33 is formed. On the back surface side of the recessed arrangement region 52, a strength reducing processed portion 34 for promoting breakage of the skin layer 32 is arranged.

Therefore, in the embodiment, even if the fabric 33 of the skin layer 32 is a material that is difficult to break smoothly, the processed portion 34 for reducing the strength in which stress is easily concentrated is used to guide the starting point of the break of the skin layer 32 and the propagation of the break. The protrusion opening 60 in the epidermis layer 32 can be smoothly formed. Further, since the fabric 33 made of woven fabric is arranged on the surface side of the skin layer 32, it is possible to improve the tactile sensation and design of the airbag cover 20.

In the airbag cover 20 of the embodiment, the recesses 40a of the tear portion 40 provided in the base material 21 are Y-shaped at both ends, which expand in a V shape from both ends of the central one-letter-shaped portion 41 when viewed from above. Although it is arranged as a shape, as in the airbag cover 20A shown in FIGS. 6 and 7, the recess 40a of the tear portion 40A may be arranged in a substantially H shape when viewed from above. In this airbag cover 20A, the door portions 22A (F, B) on both front and rear sides of the substantially H-shaped horizontal bar portion 44 between the substantially H-shaped vertical bar portions 45 (L, R) of the tear portion 40A are provided. , It opens like a Kannon door, and a protrusion opening 60 is formed.

Of course, also in this airbag cover 20A, similarly to the airbag cover 20, the skin layer 32 forms the recess-near regions 54 on both sides of the tear portion 40A directly above the recess 40a with respect to the base material 21 and directly above the recess 40a. The adhesive strength is improved by an adhesive tape 50, a primer 51, or the like from the concave portion arrangement region 52 and the peripheral peripheral region 56 around the concave portion vicinity region 54, and the adhesive strength is improved and the substrate 21 is adhered and arranged. .. Further, also in the airbag cover 20A, the skin layer 32 is configured to include the fabric 33 disposed on the surface side and the sheet-shaped cushion layer 37 to which the fabric 33 is adhered, and the fabric 33 is formed. , A strength-reducing processed portion 34 for promoting breakage of the skin layer 32 is arranged on the back surface side of the recessed arrangement region 52, and the same action and effect as the airbag cover 20 can be obtained. ..

As in the air bag cover 20B shown in FIGS. 8 and 9, the recess 40a of the tear portion 40A is arranged in a substantially H shape when viewed from above, and the skin layer 32 is on the surface side. A fabric 33 to be arranged and a sheet-shaped cushion layer 37 to which the fabric 33 is adhered are provided, and the fabric 33 is used on the back surface side for reducing the strength for promoting the breakage of the skin layer 32. When the processed portion 34B is arranged, the processed portion 34B for reducing the strength is along the substantially H-shaped horizontal bar portion 44 of the recess 40a and directly above the substantially H-shaped horizontal bar portion 44 of the recess 40a. A plurality of them may be arranged side by side, including the inside of the recessed arrangement area 52 in the vicinity.

In this airbag cover 20B, the strength reducing processing portion 34B is arranged along the substantially H-shaped horizontal bar portion 44 of the tear portion 40A, and the skin layer 32 is adhered to the surface side of the base material 21. By doing so, even if the processing portion 34B for reducing the strength is not accurately arranged at the position directly above the horizontal bar portion 44 of the tear portion 40A (center in the width direction of the recess 40a), the horizontal bar portion 44 of the tear portion 40A It is possible to dispose any of the strength-reducing processing portions 34B in the vicinity immediately above (near the center of the recess 40a in the width direction and in the recess arrangement region 52). Therefore, when the tear portion 40A of the base material 21 breaks and the door portions 22A (F, B) are pushed open due to the expansion of the airbag 11 (see FIG. 2), the horizontal bar portion 44 of the tear portion 40A The strength-reducing processed portion 34B (A) of the epidermis layer 32 in the vicinity immediately above (inside the recessed arrangement region 52) easily breaks due to stress concentration, and the break of the epidermis layer 32 is quickly and smoothly propagated. be able to. That is, even if the processed portion 34B for reducing the strength of the skin layer 32 is not accurately arranged at the position directly above the horizontal bar portion 44 of the tear portion 40A (center in the width direction of the recess 40a), when the airbag 11 is expanded. Since the skin layer 32 is smoothly broken to form a protrusion opening 60 and the airbag 11 can be projected from the protrusion opening 60, the alignment of the skin layer 32 at the time of arrangement on the base material 21 can be achieved. Can be easily performed.

In the airbag cover 20B, the vertical bar portion 45 (L, R) of the tear portion 40A is in a state orthogonal to the plurality of strength reduction processing portions 34B, but the vertical rod portion 45 (L) of the tear portion 40A. , R) The region adjacent to both sides is a recessed region 54 in which the skin layer 32 is adhered to the base material 21 with increased adhesive strength, and the recessed arrangement of the vertical bar portion 45 of the tear portion 40A in the skin layer 32. In the setting region 52, the epidermis layer 32 is fractured while following the fracture of the vertical bar portion 45 of the tear portion 40A and crossing the strength-reducing processed portion 34B arranged side by side. The protrusion opening 60 can be smoothly formed while preventing the 32 from scattering.

Further, when the tear portion 40A having the recess 40a provided in a substantially H shape when viewed from above is arranged on the base material 21 and the processed portion for reducing the strength is arranged side by side on the back surface side of the fabric 33, FIG. 10 shows. As in the airbag cover 20C, the processed portions 35 and 36 for reducing the strength may be arranged in a grid pattern.

That is, in this airbag cover 20C, the strength-reducing processed portion on the back surface side of the fabric 33 is located in the vicinity directly above the substantially H-shaped horizontal bar portion 44 of the recess 40a and the substantially H-shaped vertical bar portion 45 of the recess 40a ( The laterally processed portion 35 along the substantially H-shaped horizontal bar portion 44 of the recess 40a and the substantially H-shaped vertical bar portion of the recess 40a, including the vicinity directly above L, R) and the inside of the recessed portion arrangement region 52. A plurality of vertical processing portions 36 along the 45 (L, R) are arranged side by side and arranged in a grid pattern.

In such an airbag cover 20C, in addition to the strength reduction processing portion (horizontal processing portion) 35 along the substantially H-shaped horizontal bar portion 44 of the tear portion 40A, the substantially H-shaped vertical portion of the tear portion 40A Since the strength reduction processing portion (longitudinal processing portion) 36 along the rod portion 45 (L, R) is also arranged side by side, the horizontal bar portion 44 having a substantially H shape is formed due to the breakage of the tear portion 40A of the base material 21. Even if the door portions 22AF and 22AB on both sides of the above are open, the skin layer 32 in the recessed arrangement region 52 corresponding to the horizontal bar portion 44 and the vertical bar portion 45 (L, R) of the tear portion 40A. The laterally processed portion 35 that is substantially parallel to the tip portion of the door portion 22A (F, B) and the longitudinally processed portion 36 that is substantially parallel to the portions on both edges of the door portion 22A (F, B) are also formed. Both of them can be smoothly broken, and the base material 21 and the skin layer 32 are formed by smoothly aligning the breaking lines and breaking, and opening the door portions 22A (F, B). The opening shape of the projecting opening 60 can be stabilized, and the projecting form of the airbag 11 can be stabilized.

When a plurality of strength-reducing processing portions 34B, 35, 36 are arranged side by side in the airbag covers 20B, 20C, one of the processing portions 34B, 35, 36 is surely contained in the recessed arrangement region 52. It is desirable that the mutual pitch VP (see FIG. 8) of the plurality of processed portions 34B, 35, 36 is smaller than the width dimension WC (see FIG. 8) of the recessed arrangement region 52 so that the plurality of processed portions 34B, 35, 36 are arranged (VP <. WC).

Further, the number of the processed portions 34B, 35, 36 for reducing the strength to be arranged side by side is a plurality of 2 to 2 because any of the processed portions 34B, 35, 36 may be arranged in the recessed arrangement region 52. It may be three or a plurality of about 2 to 10 arranged beyond the recessed arrangement area 52. Further, as for the regions in the length direction in which they are arranged, the strength reducing processing portions 34B, 35, 36 may be arranged side by side only in the region having a length dimension including the area of the tear portion 40A.

Of course, if the fabric 33 is smoothly broken without scattering when the airbag 11 is expanded, the strength-reducing processed portion 34 provided on the back surface side of the fabric 33 is like the airbag cover 20D shown in FIG. , The width dimension WM may be made larger than the width dimension WT of the recess 40a.

In this case, for example, the recess 40a of the tear portion 40 has a width dimension WT of about 1 mm within a range of about 0.5 to 3 mm, and the width dimension WM of the strength reducing processing portion 34 is larger than the width dimension WT of the recess 40a. It may be increased to about 2 mm within a range of about 1 to 5 mm.

Further, in the case of the embodiment, the fabric 33 made of a woven fabric, a knitted fabric, or the like is exemplified as the skin main body on the surface side of the skin layer 32, but the skin main body may be made of another leather, a non-woven fabric, or the like.

Further, in the embodiment, the skin layer 32 is configured to include the fabric 33 and the cushion layer 37, but the skin layer 32 is formed from one layer of the skin body such as the fabric 33 and leather. May be good.

Furthermore, the cushion layer 37 may also be made of a foam material such as polypropylene, a synthetic resin material such as urethane, or a cloth material such as a non-woven fabric.

Further, in the case of the embodiment, the recess 40a of the tear portions 40 and 40A is shown in a state of reaching the cushion layer 37, but the recess 40a is formed only on the base material 21 without reaching the cushion layer 37. The tear portions 40 and 40A having the formed structure may be used.

It should be noted that, in order to allow the fabric 33 of the skin layer 32 to be smoothly broken, a concave groove or a concave portion, a cut portion, a cut portion, a cross-sectional reduced portion, or the like is provided on the back surface side of the fabric 33 to reduce the strength. In the airbag cover on which the processed portion 34 is arranged, the fabric 33 can be smoothly broken in correspondence with the tear portions 40 and 40A in a state where the feel and design are suitable. Therefore, the base material 21 As an aspect of adhesion between the skin layer 32 and the skin layer 32, the air bag cover is formed by simply adhering the skin layer 32 to the base material 21 without providing a difference in adhesive strength between the recessed arrangement region 52 and the recessed vicinity region 54. , Processing portions 34, 34B, 35, 36 for reducing strength may be provided on the back surface side of the fabric 33.

11 ... Airbag, 20, 20A, 20B, 20C, 20D ... Airbag cover, 21 ... Base material, 22, 22A (F, B) ... Central door part, 23 (L, R) ... Triangular door part, 32 ... Skin layer, 33 ... (skin) fabric, 34, 34B ... Strength reduction processing part, 35 ... Horizontal processing part, 36 ... Vertical processing part, 37 ... Cushion layer, 40, 40A ... Tear part, 40a ... (V) Groove) Recess, 41 ... Linear part / single character part, 42 (L, R) ... V-shaped part, 44 ... Horizontal bar part, 45 (L, R) ... Vertical bar part, 50 ... Adhesive tape, 52 ... Recessed arrangement area, 54 ... Recessed area, 56 ... Peripheral area, 60 ... Projection opening.

Claims (7)

As a configuration having a base material and a skin layer adhered to the front surface side of the base material, the folded airbag is covered and expanded by the airbag to move from the back surface side to the front surface side of the base material. An airbag cover having a structure in which a fore portion formed by disposing a recessed recess is broken to form a protrusion opening, and the airbag is projected from the protrusion opening.
With respect to the base material, the skin layer forms a recess-prone region on both sides of the tear portion immediately above the recess from the recess-arranged region directly above the recess and the peripheral peripheral region around the recess-near region. An airbag cover characterized in that it is adhered to and arranged on the base material with improved adhesive strength. The airbag according to claim 1, wherein an adhesive tape is attached to the recessed region, and the recessed region has a higher adhesive strength than the recessed region and the peripheral region. cover. 2. Described airbag cover. The airbag cover according to claim 1 or 2, wherein the recesses are arranged in a substantially H shape when viewed from above. The skin layer is configured to include a fabric disposed on the surface side and a sheet-shaped cushion layer to which the fabric is adhered.
4. The airbag cover described in item 1. The skin layer is configured to include a fabric disposed on the surface side and a sheet-shaped cushion layer to which the fabric is adhered.
The fabric is provided with a strength-reducing processed portion for promoting breakage of the skin layer on the back surface side.
A plurality of the processed portions for reducing strength are arranged along the substantially H-shaped horizontal bar portion of the recess, including the inside of the recess arrangement region in the vicinity immediately above the substantially H-shaped horizontal bar portion of the recess. The airbag cover according to claim 4, wherein the airbag cover is provided. The strength reduction processing part
Including the inside of the recess arrangement region in the vicinity of directly above the substantially H-shaped horizontal bar portion of the recess and in the vicinity of directly above the substantially H-shaped vertical bar portion of the recess.
A plurality of laterally processed portions along the substantially H-shaped horizontal bar portion of the recess and a plurality of vertically processed portions along the substantially H-shaped vertical bar portion of the recess are arranged side by side.
The airbag cover according to claim 6, wherein the airbag cover is arranged in a grid pattern.

Images