JP2017114262A - Cover body for air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover body for an air bag device, which is capable of preventing deformation of a cover main body and peeling of a skin body from the cover main body caused by the contraction stress of the skin body.SOLUTION: A thin part 64 that absorbs contraction stress is provided at a position opposed to an extension plate part provided to extend to the outer edge of the front plate part of a cover main body 26. A skin part 27 extends at the position of the thin part 64 by contraction stress generated toward the center of the skin body 27 by heating, and thus the contraction stress can be effectively absorbed and softened. Deformation of the cover main body 26 and peeling of the skin body 27 from the cover main body 26 caused by the contraction stress of the skin body 27 can be prevented.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cover body of an airbag device including an outer skin body that is disposed so as to cover at least a part of a design surface of a cover body.

  2. Description of the Related Art Conventionally, an airbag device provided in a fixed part of a handle of a vehicle such as an automobile has been used. The airbag device includes a bag-shaped airbag, an inflator that supplies gas to the airbag, and a cover body that covers and stores the airbag when not deployed. When the vehicle receives an impact due to, for example, a collision, the air bag is inflated by supplying gas from the inflator to the air bag. A plurality of door portions are formed by breaking along the tear line, and the door portions are deployed around the hinge portion, so that the airbag is deployed to the occupant side to restrain and protect the occupant. Has been.

  2. Description of the Related Art In recent years, there has been known a technique for producing a high-class feeling and improving merchantability by applying a skin body such as leather to the surface of an airbag cover body. In such an epidermis, a recess is formed at a position corresponding to a tear line provided in the airbag cover body, and a portion where the recess is formed is a thin-walled portion. For this reason, by arranging the tear line of the airbag cover main body and the thin portion of the epidermis so as to overlap each other, the airbag cover can be cleaved without causing the epidermis to become an obstacle when the airbag is deployed. (For example, refer to Patent Documents 1 and 2.)

JP 9-183373 A (page 3, Fig. 1-4) Japanese Patent No. 4093086 (page 4-7, FIG. 4)

  However, when the airbag cover has a two-layer structure of the airbag cover body and the skin body, for example, when a car is parked under a hot summer sun, the heated skin body contracts and the synthetic resin is used. Since the airbag cover may be deformed by the thermal expansion of the airbag cover body, it is necessary to increase the rigidity of the airbag cover body in order to prevent such deformation. In that case, for example, expensive materials such as glass-filled nylon must be used, and as a result, it is not easy to reduce the manufacturing cost.

  The present invention has been made in view of the above points, and provides a cover body of an airbag device capable of preventing deformation of the cover body and peeling of the skin body from the cover body due to the contraction stress of the skin body. Objective.

  The cover body of the airbag device according to claim 1 includes a cover body and a skin body disposed so as to cover at least a part of a design surface of the cover body, and the cover body includes a stored airbag. A body portion that covers the outer edge portion of the body portion, and an extension portion that forms at least a part of the design surface together with the body portion, and the skin body faces the extension portion. It is provided with a contraction stress absorbing portion that is provided at a position and absorbs contraction stress.

  The cover body of the airbag device according to claim 2 is the cover body of the airbag device according to claim 1, wherein the cover body is provided on a side of the body portion facing the airbag, and when the airbag is inflated and deployed. The tear body is provided with a tear line that can be cleaved to form a plurality of door portions, the epidermis includes a planned breakable portion that can be broken along the tear line, and the shrinkage stress absorbing portion is spaced from the planned break portion. It is provided.

  The cover body of the airbag device according to claim 3 is the cover body of the airbag device according to claim 1 or 2, wherein the shrinkage stress absorbing portion intersects the direction parallel to the contour of the extending portion. It is provided along either direction.

  The cover body of the airbag device according to claim 4 is the cover body of the airbag device according to any one of claims 1 to 3, wherein the shrinkage stress absorbing portion is a thin portion.

  The cover body of the airbag device according to claim 5 is the cover body of the airbag device according to any one of claims 1 to 4, wherein the skin body is made of natural leather.

  According to the cover body of the airbag device according to claim 1, the skin body is provided with the shrinkage stress absorbing portion that absorbs the shrinkage stress at a position facing the extending portion of the cover body. The contraction stress toward the center of the cover body can be effectively absorbed by the contraction stress absorbing section, and deformation of the cover body and peeling of the skin body from the cover body due to the contraction stress of the skin body can be prevented.

  According to the cover body of the airbag device according to claim 2, since the shrinkage stress absorbing portion is provided apart from the planned breakable portion along the tear line provided in the cover body, the airbag is expanded. The breakage from the tear line of the cover body at the time and the breakage from the planned breakage part of the skin body are not prevented by the shrinkage stress absorbing part.

  According to the cover body of the airbag device according to claim 3, in addition to the effect of the cover body of the airbag device according to claim 1 or 2, the shrinkage stress absorbing portion is parallel to the contour of the extending portion. Since the contraction stress absorbing portion is disposed opposite to the contraction direction of the epidermis, and the position that can absorb the contraction stress generated in the epidermis most effectively. Therefore, the deformation of the cover body and the peeling of the skin body from the cover body due to the shrinkage stress can be more effectively prevented.

  According to the cover body of the airbag device according to claim 4, in addition to the effect of the cover body of the airbag device according to any one of claims 1 to 3, the shrinkage stress absorbing portion is a thin wall portion. The appearance performance is not impaired, and it can be processed simultaneously with the portion to be broken, so that the manufacturing cost can be reduced.

  According to the cover body of the airbag device according to claim 5, in addition to the effect of the cover body of the airbag device according to any one of claims 1 to 4, among leather, natural leather has the most contraction stress due to heat. Using a large natural leather as the skin, the cover body has a high-class feel, and the shrinkage stress absorbing part reliably prevents deformation of the cover body and peeling of the skin body from the cover body due to the shrinkage stress of the skin body. it can.

It is a top view which shows the cover body of the airbag apparatus of the 1st Embodiment of this invention. It is a front view of an airbag apparatus same as the above. It is sectional drawing which shows typically the behavior at the time of deployment operation | movement of the airbag of an airbag apparatus same as the above. (A) is a front view which shows the cover main body of a cover body same as the above, (b) is a front view which shows the skin body of a cover body same as the above. It is a perspective view which shows the steering wheel provided with the airbag apparatus same as the above. It is a top view which shows the cover body of the airbag apparatus of the 2nd Embodiment of this invention. It is a top view which shows the cover body of the airbag apparatus of the 3rd Embodiment of this invention.

  The configuration of the first embodiment of the present invention will be described below with reference to the drawings.

  In FIG. 5, reference numeral 10 denotes a steering wheel as a steering wheel of an automobile, which is a vehicle. The steering wheel 10 includes a steering wheel main body 11 as a steering wheel main body, and an airbag device 12 mounted on the passenger side of the steering wheel main body 11. And. The steering wheel 10 is normally mounted on a steering shaft provided in the vehicle in a tilted state. Hereinafter, the steering shaft side is defined as the rear side and the occupant side is defined as the front side, based on the straight traveling state of the vehicle. The direction toward the windshield (arrow A direction) will be described as the upper side.

  The steering wheel main body 11 is connected to the rim portion 14 which is a grip portion which is an annular grip portion, the boss portion 15 located inside the rim portion 14, and the rim portion 14 and the boss portion 15. A plurality of spoke portions 16 are formed in the present embodiment. And in this Embodiment, the spoke part 16 is arrange | positioned in the upper part both sides and the lower part of the boss | hub part 15 in the rectilinear state.

  Although not shown, a substantially cylindrical boss that is fitted to the steering shaft is provided on the back surface of the boss portion 15, and a boss plate that constitutes a core body is die-casted with magnesium alloy or the like. It is fixed together by casting. From the boss plate, the core metal of the spoke part 16 is integrally extended or fixed by welding or the like. Further, the core metal of the rim part 14 is fixed to the core metal of the spoke part 16 by welding or the like. Further, a skin portion is formed on the outer peripheral portion of the core metal of the rim portion 14 and the outer peripheral portion of the spoke portion 16 on the rim portion 14 side of the core metal, and further, all or the outer periphery of the skin portion is formed. Part of it is covered with a skin such as natural or artificial leather.

  On the other hand, the airbag device 12 is also referred to as an airbag module, and is disposed so as to cover the front side of the boss portion 15 of the steering wheel main body 11. As shown in FIG. 3, a synthetic resin, a metal plate, or the like is used. A base plate 21 as a member to be attached, a bag-like airbag 22, an inflator 23 for injecting gas, and the like, and a resin cover body 24 are provided. The base plate 21 is attached to the steering wheel main body 11 (FIG. 5) via a horn plate or a bracket portion, and the airbag 22, the inflator 23, and the cover body 24 are attached to the base plate 21 and folded small. The airbag 22 is covered with a cover body 24.

  The cover body 24 is also referred to as a case body, a pad, or a module cover. For example, a cover body 26 formed integrally with a member such as a synthetic resin, and a skin body 27 that integrally covers the cover body 26 It has.

  The cover body 26 includes a front plate portion 31 as a facing portion that covers a part of the boss portion 15 and the spoke portion 16 (FIG. 5), and a substantially rectangular tube shape in front view from the back surface (back surface) of the front plate portion 31. And a peripheral plate portion 32 that is a peripheral wall as a mounting wall portion protruding in a cylindrical shape. A portion of the cover body 24 surrounded by the front plate portion 31 and the peripheral plate portion 32 is an airbag storage portion that stores the folded airbag 22. An emblem 33 (FIG. 2) as a decorative member may be provided in a portion facing the front side of the airbag storage portion.

  Although the front plate portion 31 can take various shapes in design, in the present embodiment, the front plate portion 31 is a circumferential plate in a front view substantially along the shape of the boss portion 15 (FIG. 5). A front plate portion 35 as a main body formed slightly larger than the portion 32 and an upper end portion which is an outer edge portion of the front plate portion 35, and is extended from the upper end portion of the front plate portion 35 to the rear side (anti-occupant side). ) And an extending plate portion 36 as an extending portion extending in the direction. Further, a tear line 37 as a fracture portion is provided on the back side of the front plate portion 31, that is, on the side opposite to the passenger. The front plate portion 31 constitutes the design surface of the airbag device 12.

  The front plate portion 35 covers the rear side that is the protruding direction side of the airbag 22, and as shown in FIG. 4A, for example, the width gradually decreases from the upper side to the lower side when viewed from the front side. It is formed in a pentagon shape. The front plate portion 35 may be provided with a hole 38 for attaching the emblem 33 (FIG. 2).

  As shown in FIG. 1, the extension plate portion 36 is continuous with the upper portion of the front plate portion 35, and is formed so as to gradually protrude forward from the left and right sides toward the center portion. The part is curved in an arc shape.

  The peripheral plate portion 32 shown in FIG. 3 is a portion for attaching the cover body 24 to the base plate 21. The peripheral plate portion 32 protrudes in a cylindrical shape (frame shape) from the back side of the front plate portion 35 toward the direction opposite to the protruding direction of the airbag 22.

  The emblem 33 shown in FIG. 2 is also called an ornament or the like, and is molded into an arbitrary shape with a hard or soft synthetic resin and appropriately subjected to a treatment such as painting or plating. It is fixed integrally to the part 35. The emblem 33 is not an essential component.

  The tear line 37 shown in FIG. 4 (a) is a thin-walled portion that can be called a tear, a tear groove, a planned cleavage groove, a planned door line portion, or the like, and the back surface (back surface) side of the front plate portion 35 of the front plate portion 31 is grooved. Is formed as a weak part that is more fragile than other parts of the front plate part 31 and that can be broken and easily deformed. In the front plate portion 31, the portion of which the outer edge portion is partitioned by the tear line 37 is, for example, a plurality of door planned portions 41 in the present embodiment, and the outside of the tear line 37, that is, the door A periphery of the planned portion 41 is an outer portion 42 that is a non-deployed portion. Further, the tear line 37 can be arbitrarily set according to the shape and number of the planned door portion 41 to be set.For example, in the present embodiment, the side tear line portions 45 along the outer edge portions on both sides of the front plate portion 35, 45, a connecting tear line portion 46 continuous between the side tear line portions 45, 45 along the lower portion of the emblem 33, and a position below the emblem 33, which is a substantially central portion in the left-right direction of the connecting tear line portion 46, downward. An extended tear line portion 47 extending linearly and a lower tear line portion 48 extending in the left-right direction continuously to the lower end portion of the extended tear line portion 47 are provided.

  Each door planned portion 41 covers the bulging side of the airbag 22 (FIG. 3) that is folded and stored in a normal state. When the airbag 22 (FIG. 3) bulges, it is broken from the tear line 37 to form the front plate portion 31. It is a part which comprises the door part 51 (FIG. 3). Each door planned portion 41 (door portion 51 (FIG. 3)) can be formed in any shape as long as the airbag 22 (FIG. 3) can be deployed with desired deployment characteristics. Each is partitioned by a tear line 37 and formed on the upper portion of the front plate portion 31 and on the left and right sides of the lower portion.

  And the door part 51 (FIG. 3) is a front side between the upper end part of the side part tear line part 45 and 45, and between the lower end part of the side part tear line part 45 and 45, and the both ends of the lower tear line part 48, respectively. Hinges 53, 54, and 55, which serve as pivot shafts when they are deployed in the same manner. That is, the portion of the outer peripheral portion of the front plate portion 31 where the tear line 37 is not formed connects the developed door portion 51 (FIG. 3) to the peripheral plate portion 32 and the outer portion 42 which are non-deployed portions. ing.

  On the other hand, the skin body 27 shown in FIG. 1 covers the surface side of the cover body 26 to improve the appearance and feel, and is formed into a sheet shape from natural leather (genuine leather), artificial leather, or soft resin. ing. In the present embodiment, the epidermis body 27 is formed of natural leather. Further, the skin body 27 includes at least a part of the front plate portion 35 of the cover body 26, and in this embodiment, the skin body front portion 61 which is the skin body portion covering the whole, and the extending plate portion of the cover body 26 In the present embodiment, at least a part of 36 is provided with an epidermis extending part 62 as an epidermis extending part covering the whole. Further, as shown in FIG. 2, the skin body 27 is provided with a planned fracture portion 63 that can be broken along the tear line 37 on the back side of the skin body front portion 61, that is, on the front side facing the front plate portion 35. It has been. Further, as shown in FIG. 1, the epidermis 27 has a contraction stress that absorbs the contraction stress of the epidermis 27 on the back side of the epidermis extension part 62, that is, on the lower side facing the extension plate part 36. A thin portion 64 as an absorbing portion is provided. The thin portion 64 is formed by laser processing or the like so as to have a predetermined width with a remaining thickness of less than half of the thickness of the epidermis 27, for example. In this embodiment, the epidermis 27 is divided into, for example, one epidermis 27a and another epidermis 27b. These one and other skins 27a and 27b may be made of the same material or different materials.

  The skin body front part 61 shown in FIG. 2 is formed in substantially the same shape as the front plate part 35 of the cover body 26, that is, for example, a pentagonal shape gradually narrowing in the left-right direction from the upper side to the lower side when viewed from the front. Has been. In the front surface portion 61 of the skin body, a skin body hole portion 65 (FIG. 4B) for attaching the emblem 33 is provided at a position corresponding to the hole portion 38 (FIG. 4A) of the cover body 26. May be.

  The skin extension portion 62 shown in FIG. 1 has substantially the same shape as the extension plate portion 36 of the cover body 26, that is, for example, is formed so as to gradually protrude forward from the left and right sides toward the center portion. A certain rear edge is curved in an arc shape.

  2 is a concave portion (thin wall portion) formed so as to have a remaining thickness that is less than half of the thickness of the epidermis 27, and other than the epidermis front portion 61 of the epidermis 27. It is formed as a weak part that is more fragile than the part and can be broken and easily deformed. The planned fracture portion 63 is formed in a shape substantially equal to the tear line 37 (FIG. 4A), for example. Therefore, for example, in the present embodiment, the planned fracture portion 63 includes both side fracture planned portions 66, 66 formed on both sides from the outer peripheral portion of the skin body front portion 61 to the extending plate portion 36. The connection breakage planned portion 67 that continues between the side breakage planned portions 66, 66 along the lower part of the emblem 33, and the position below the emblem 33 that is a substantially central portion in the left-right direction of the connection breakage planned portion 67. An extended fracture planned portion 68 that extends linearly to the left and a lower fracture planned portion 69 that extends in the left-right direction continuously to the lower end of the extended fracture planned portion 68 are provided. These side portion planned break portions 66 and 66 are located in front of the side tear line portions 45 and 45, the connection break planned portion 67 is located in front of the connection tear line portion 46, and the extended break planned portion 68 extends. The lower fracture scheduled portion 69 is located in front of the lower tear line portion 48 and is located in front of the tear line portion 47.

  The thin-walled portion 64 shown in FIG. 1 is an elongated linear concave portion that is formed so as to have a remaining thickness that is less than half of the thickness of the epidermis 27, for example. The thin-walled portion 64 is disposed at a position different from the planned fracture portion 63 (the tear line 37) shown in FIG. 2, that is, a position separated from the planned fracture portion 63 (the tear line 37). Returning to FIG. 1, the thin-walled portion 64 is intermittent along the direction intersecting (orthogonal) with respect to the left-right direction, that is, the direction (front-rear direction) from the epidermis extending portion 62 toward the epidermis front portion 61. It is formed like a broken line. Further, the thin-walled portions 64 are arranged in a plurality of rows in the front-rear direction, that is, in the direction from the epidermis extending portion 62 to the epidermis front portion 61. In the present embodiment, the thin portions 64 are arranged in three rows, and the front row, that is, the first row 64a farthest from the skin front portion 61 is the skin extension portion 62 (extension plate portion). 36) A second row 64b that is intermittently arranged in a substantially arc shape along the rear edge of the first row 64a and is separated from the front of the first row 64a (closer to the frontal body front portion 61) extends along the left-right direction. The third row 64c that is intermittently arranged in a straight line and is spaced apart in front of the second row 64b (near the skin front portion 61), that is, the third row 64c closest to the skin front portion 61 is These are arranged intermittently in a straight line along the left-right direction, that is, substantially in parallel with the second row 64b. Therefore, the thin portion 64 is formed along a direction parallel to or intersecting with the contour of the epidermis extending portion 62 (extending plate portion 36). Further, the thin portion 64 is arranged so that the columns adjacent to each other, that is, the first column 64a and the second column 64b, and the second column 64b and the third column 64c are alternately shifted to the left and right. The thin-walled portion 64 as a whole is disposed closer to the front side than the central portion in the front-rear direction of the epidermis extending portion 62, that is, in a region separated from the epidermis front portion 61.

  Further, one skin 27a constitutes the main design of the surface plate portion 31, and as shown in FIG. 2, for example, it is formed in a pentagonal shape that gradually becomes narrower from the left and right sides downward. This one skin 27a constitutes most (central part) of the skin body front part 61 and the skin body extension part 62. In the surface board part 31, the front panel part 35 and the extension board part 36 ( It covers the surface of a predetermined width at the center of FIG. Accordingly, the one skin 27a covers the tear lines 37 (side tear line portions 45, 45, connecting tear line portions 46, extended tear line portions 47, and lower tear line portions 48). The outer edge portion of one skin 27a is an overlapping portion 71 that is overlapped and joined to the other skin 27b. The overlapping portion 71 is a winding portion that is folded and wound around the back side of one skin 27a, and is stitched and joined to the other skin 27b by a stitch portion 72. This stitch portion 72 is provided over the upper portion, both side portions, and the lower portion of one skin 27a, and both side portions extend in the vertical direction, and spans the epidermis front portion 61 and the epidermis extending portion 62 of the epidermis 27. Are continuous. Furthermore, the fracture | rupture planned part 63 and the thin part 64 (FIG. 1) are located in the back side of the one skin 27a.

  The other skin 27b is formed so as to surround both sides and the lower part of one skin 27a. The other skin 27b covers the surface of the front plate portion 31 on both sides or the lower portion of the front plate portion 35 and both sides of the extended plate portion 36 (FIG. 1). For this reason, the other epidermis 27b is located outside the tear line 37.

  When the cover body 24 is manufactured, the cover body 26 including the front plate portion 31 and the peripheral plate portion 32 shown in FIG. 3 is injection-molded with a synthetic resin in advance. At this time, the skin 27 (one and other skins 27a and 27b) shown in FIG. 1 may be insert-molded integrally with the cover body 26, or may be pasted on the separately formed cover body 26 in a later step. May be attached. Then, a separately molded emblem 33 (FIG. 2) is attached to the cover body 24 that covers the surface plate portion 31 with the skin body 27 (one and other skins 27a and 27b).

  When an automobile equipped with the airbag device 12 having the cover body 24 on the steering wheel 10 (FIG. 5) collides, the control device activates the inflator 23 shown in FIG. 3 to supply gas to the airbag 22. Then, the airbag 22 is rapidly inflated and deployed, and the pressure for inflating and deploying pushes up each door planned portion 41, and the inflation pressure of the airbag 22 acts on the tear line 37, and the cover body 24 moves along the tear line 37. The front plate portion 31 is integrally broken with the skin body 27 that is torn from the planned fracture portion 63 to form a door portion 51. The formed door 51 forms a projecting opening 74 that is an opening that rotates around the hinges 53, 54, and 55 (FIG. 4A) to inflate the airbag 22. The airbag 22 is deployed in front of the occupant from the mouth 74 to protect the occupant.

  Here, for example, when a car is parked, for example, under a hot summer sun, the cover body 24 of the airbag device 12 is heated, and the epidermis body 27 attached to the design surface of the cover body 26 is shrunk by heat. Stress is generated toward the center portion of the skin body 27, that is, the center portion (emblem 33) of the skin body front portion 61 shown in FIG. 2 (in the direction of arrow D). In other words, as shown in FIG. 1, the epidermis extending portion 62 of the epidermis 27 covering the extending plate portion 36 of the cover body 26 is centered in the front and left and right directions so as to be drawn toward the epidermis front portion 61. Stress is generated toward the part (in the direction of arrow D).

  Therefore, in the present embodiment, in the skin body 27, the thin body portion 64 that absorbs the contraction stress is provided in the skin body extension portion 62 that is a position facing the extension plate portion 36 of the cover body 26. The skin 27 (skin extension 62) is extended by the thin-walled portion 64 due to the shrinkage stress toward the center of the skin 27 due to heating or the like, and the contraction stress can be effectively absorbed and relaxed. Therefore, even if the cover body 24 of the airbag device 12 is placed in a vehicle compartment that is at a high temperature, the cover body 26 is deformed so as to impair the merchantability of the cover body 26 due to the contraction stress, and the cover of the terminal portion of the skin body 27, etc. The peeling from the main body 26 can be prevented.

  Further, since the thin-walled portion 64 is provided apart from the breakable portion 63 that can be broken along the tear line 37 provided in the cover body 26, the thin-walled portion 64 from the tear line 37 of the cover body 26 when the airbag 22 is deployed. The thin portion 64 does not prevent the breakage and the breakage of the epidermis 27 from the planned breakage portion 63.

  Furthermore, since the thin wall portion 64 is formed along one of the direction parallel to the direction parallel to the contour of the extending plate portion 36 and the direction intersecting the thin plate portion 64, the thin wall portion 64 is contracted in the direction of contraction of the epidermis 27 (arrow D). And the position where the contraction stress generated in the epidermis 27 can be absorbed most effectively. Peeling from the cover body 26 such as the terminal portion can be more effectively prevented.

  In addition, the thin-walled portion 64 does not impair the appearance performance of the design surface and can be processed simultaneously with the planned fracture portion 63, so that the manufacturing cost can be reduced.

  In particular, among leather, natural leather is said to have the largest shrinkage stress due to heat, but with the thin-walled portion 64 described above, the skin body is made of natural leather as the skin body 27, making it a high-quality cover body 24. It is possible to reliably prevent the deformation of the cover main body 26 due to the contraction stress 27 and the peeling of the end portion of the skin body 27 from the cover main body 26.

  The thin portion 64 of the first embodiment is formed in a plurality of wavy rows that are continuous in the left-right direction and alternately curved in the front-rear direction, for example, as in the second embodiment shown in FIG. Alternatively, as in the third embodiment shown in FIG. 7, it may be formed in a plurality of lines of polygonal lines that are continuous in the left-right direction and are alternately bent in a zigzag shape (triangular wave shape) in the front-rear direction.

  In each of the above embodiments, the thin portion 64 is exemplified as the contraction stress absorbing portion, but the present invention is not limited to this. For example, on the back side of the epidermis extending portion 62 of the epidermis 27, a plurality of rows of processing blades and grid-like processing blades set so that the remaining thickness is less than half the thickness of the epidermis 27 For example, an eye cut may be made by pressing the epidermis extending portion 62 against a jig, or a tanning agent or mink oil used for tanning in the leather industry may be applied. It may be applied to a predetermined position on the back side of the protruding portion 62 to chemically form a contraction stress absorbing portion.

  Further, in each of the above embodiments, the cover body 24 is not only used for the driver's seat airbag device, but also installed for example in the instrument panel section and used for the passenger seat that deploys the airbag in front of the passenger in the passenger seat. The present invention can also be applied to an airbag device or a knee airbag device that deploys an airbag between a vertical wall surface portion facing a passenger in a passenger seat and a lower limb portion of the passenger.

  The present invention can be suitably used as a cover body of an airbag device for a driver's seat, for example.

12 Airbag device
22 airbag
24 Cover body
26 Cover body
27 epidermis
35 Front plate as main unit
36 Extension plate as extension
37 Tearline
51 Door
63 Planned break
64 Thin part as shrinkage stress absorbing part

Claims (5)

A cover body;
The cover body arranged to cover at least a part of the design surface of the cover body,
The cover body is
A main body that covers the stored airbag;
Extending to the outer edge portion of the main body portion, and including an extending portion constituting at least part of the design surface together with the main body portion,
The cover body of the airbag device, wherein the skin body includes a contraction stress absorbing portion that is provided at a position facing the extension portion and absorbs contraction stress. The cover body is provided on the side of the body portion facing the airbag, and includes a tear line that is cleaved when the airbag is inflated and deployed to form a plurality of door portions,
The epidermis has a breakable portion that can break along the tear line,
The cover body of an airbag device according to claim 1, wherein the shrinkage stress absorbing portion is provided at a position spaced apart from the planned breaking portion. 3. The airbag device according to claim 1, wherein the shrinkage stress absorbing portion is provided along one of a direction parallel to and a direction crossing the outline of the extending portion. Cover body. The cover body of an airbag device according to any one of claims 1 to 3, wherein the shrinkage stress absorbing portion is a thin portion. The cover body of the airbag device according to any one of claims 1 to 4, wherein the skin body is made of natural leather.

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