JP6706966B2

JP6706966B2 - Cover body of airbag device

Info

Publication number: JP6706966B2
Application number: JP2016091073A
Authority: JP
Inventors: 鈴木　秀伸; 秀伸鈴木; 亮介村松
Original assignee: Nihon Plast Co Ltd
Current assignee: Nihon Plast Co Ltd
Priority date: 2016-04-28
Filing date: 2016-04-28
Publication date: 2020-06-10
Anticipated expiration: 2036-04-28
Also published as: JP2017197095A

Description

本発明は、エアバッグの膨張展開時に開裂するテアラインを有するカバー本体と、このカバー本体の一部を覆う表皮部とを備えるエアバッグ装置のカバー体に関する。 The present invention relates to a cover body of an airbag device including a cover body having a tear line that is cleaved when the airbag is inflated and deployed, and a skin portion that covers a part of the cover body.

従来、例えば自動車のインストルメントパネル部やステアリングホイールなどの被設置部に配置されるエアバッグ装置が知られている。このエアバッグ装置は、箱状をなすケース体を備え、このケース体の内側に、折り畳まれたエアバッグと、このエアバッグを膨張させるガスを噴射するインフレータとを収納しているとともに、ケース体の上側の開口部がカバー体により覆われている。そして、このカバー体には、エアバッグに対向する対向部である蓋部に平面視略Ｈ字状などの破断可能な引き裂き目であるテアラインが形成され、このテアラインに囲まれた部分が扉予定部として区画形成されている。そして、自動車の衝突時などには、インフレータから膨張ガスが吹き込まれたエアバッグが、このエアバッグの膨出側を覆う扉予定部を押し上げ、その膨張の圧力によりテアラインを破断して蓋部からドアフラップすなわち扉部が開くように構成されている。 2. Description of the Related Art Conventionally, there is known an airbag device arranged in an installed portion such as an instrument panel portion or a steering wheel of an automobile. This airbag device includes a box-shaped case body, and inside the case body, a folded airbag and an inflator for injecting gas for inflating the airbag are housed, and the case body is also included. The opening on the upper side of is covered with a cover body. Then, in this cover body, a tear line which is a rupturable tear such as a substantially H shape in a plan view is formed in a lid portion which is an opposing portion facing the airbag, and a portion surrounded by the tear line is a door plan. It is divided and formed as a part. Then, in the event of a vehicle collision, an airbag in which inflation gas is blown from the inflator pushes up the planned door portion that covers the inflation side of the airbag, and the inflation pressure causes the tear line to rupture and the lid portion to come out. The door flap or door is configured to open.

このようなエアバッグ装置において、近年、美観の向上などを目的として皮革などの表皮体により蓋部の表面を覆った構成が知られている（例えば、特許文献１及び２参照。）。 In such an airbag device, in recent years, a configuration has been known in which the surface of the lid is covered with a skin body such as leather for the purpose of improving aesthetics (see, for example, Patent Documents 1 and 2).

特許第４０９３０８６号公報（第４−９頁、図１）Japanese Patent No. 4093086 (pages 4-9, FIG. 1) 特許第５２８２７５４号公報（第７−１０頁、図１−５）Patent No. 5282854 (pages 7-10, FIG. 1-5)

しかしながら、上述のような構成の場合、特に見栄えを向上するために複数の表皮体に分割して蓋部を覆うようにしたときに、エアバッグの膨張展開時、テアラインが交差している箇所において表皮体をテアラインどおりの所定形状に破断させることが求められる。 However, in the case of the configuration described above, when the airbag is inflated and deployed, the tear lines intersect at a position where the tear lines intersect, particularly when the lid is divided into a plurality of skins to cover the lid in order to improve the appearance. It is required to break the epidermis into a predetermined shape as the tear line.

本発明は、このような点に鑑みなされたもので、エアバッグの膨張展開時に所定形状に破断可能なエアバッグ装置のカバー体を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a cover body of an airbag device that can be broken into a predetermined shape when the airbag is inflated and deployed.

請求項１記載のエアバッグ装置のカバー体は、エアバッグを収納するエアバッグ収納部に対向する対向部本体を有し、前記エアバッグ収納部に収納されたエアバッグを覆う対向部、及び、この対向部の対向部本体に設けられ、前記エアバッグの膨張展開時に開裂するテアラインを備えたカバー本体と、このカバー本体の対向部を覆う表皮部とを具備し、前記テアラインは、前記対向部本体の縁部に沿って位置する縁部テアライン部と、この縁部テアライン部に対して前記対向部本体の中央側の位置に、前記縁部テアライン部と交差する方向に設けられ、この縁部テアライン部と連結された連結テアライン部とを有し、前記表皮部は、複数の表皮体と、これら表皮体の一部同士が重ね合わせられて接合され、前記対向部本体に固定された接合部と、この接合部に対して所定の距離範囲内でこの接合部に沿い、かつ、前記テアラインの少なくとも一部と重なる位置にていずれかの前記表皮体に設けられた弱部とを備え、前記弱部は、前記縁部テアライン部と重なる縁部弱部と、前記連結テアライン部と重なる連結弱部とを有し、前記縁部弱部と前記連結弱部との連結部が、前記縁部テアライン部と前記連結テアライン部との交差部と重なり、かつ、前記接合部よりも前記表皮部の中央側の位置に設けられているものである。 The cover body of the airbag apparatus according to claim 1 , further comprising a facing portion main body facing an airbag storing portion for storing the airbag, the facing portion covering the airbag stored in the airbag storing portion, and provided on the counter body of the counter part, comprising a cover body with a tear line for cleavage during inflation and deployment of the airbag, and a skin portion that covers the opposing portion of the cover body, the tear line, the opposing portions An edge tear line portion located along the edge portion of the main body, and provided at a position on the center side of the facing portion main body with respect to the edge tear line portion in a direction intersecting with the edge tear line portion. A joint tear line portion that is connected to a tear line portion, wherein the skin portion is a plurality of skin bodies, and a portion where these skin bodies are overlapped and joined to each other, and a joint portion fixed to the facing portion main body. And along this joint within a predetermined distance range with respect to the joint, and a weak portion provided on any one of the skins at a position overlapping at least a part of the tear line , The weak portion has an edge weak portion that overlaps the edge tear line portion, and a connection weak portion that overlaps the connection tear line portion, and the connection portion between the edge weak portion and the connection weak portion is the edge portion. The tear line portion and the connecting tear line portion are overlapped with each other, and are provided at a position closer to the center of the skin portion than the joint portion .

請求項２記載のエアバッグ装置のカバー体は、請求項１記載のエアバッグ装置のカバー体において、カバー本体は、エアバッグの突出方向に沿って対向部に突設され、接合部の外方に沿う突出部を備えているものである。 Cover of airbag devices 請 Motomeko 2 in that in the cover of the airbag apparatus according to claim 1, wherein the cover body, protruding from the opposing portion along the protruding direction of the airbag, out of the joint It is provided with a protruding portion extending along one direction.

請求項１記載のエアバッグ装置のカバー体によれば、表皮体の一部同士が重ね合わせられて接合され対向部本体に固定された接合部に対して所定の距離範囲内でこの接合部に沿って、テアラインの少なくとも一部と重なる位置でいずれかの表皮体に弱部を設け、テアラインの縁部テアライン部と連結テアライン部との交差部と重なる弱部の側部弱部と連結弱部との連結部を接合部よりも表皮部の中央側の位置に配置することで、エアバッグの膨張時の展開圧力を弱部に確実に作用させて表皮部が連結テアライン部に対応する連結弱部の位置から縁部テアライン部をオーバーした位置へと破断することなく、縁部テアライン部に重なる縁部弱部の位置で破断させることができ、エアバッグの膨張展開時に所定形状に破断可能となる。 According to the cover body of the airbag device according to claim 1, a part of the skin body is superposed and joined to the joint part fixed to the facing part main body within a predetermined distance range. A weak portion is provided on one of the epidermis along a position that overlaps at least a part of the tear line, and the side weak portion and the connecting weak portion of the weak portion that overlaps with the intersection of the edge tear line portion and the connected tear line portion of the tear line in Rukoto be placed in a position on the center side of the surface skin portion than the joint connecting portions of the coupling which skin portion reliably allowed to act on the weak portion deployment pressure during inflation of the air bag corresponding to the coupling tear line portion It is possible to rupture at the position of the weak edge part that overlaps the edge tear line without breaking from the position of the weak part to the position where the edge tear line part is over, and it can be broken into a predetermined shape when the airbag is inflated and deployed. Becomes

請求項２記載のエアバッグ装置のカバー体によれば、請求項１記載のエアバッグ装置のカバー体の効果に加えて、エアバッグの突出方向に沿って対向部本体に突設された突出部を接合部の外方に沿わせることで、複数の表皮体の一部の重ね合わせによる表皮部の嵩高を突出部によって吸収し、見栄えを向上でき、かつ、この突出部の位置での対向部本体の厚みによってエアバッグの膨張時の展開圧力に対して強度を確保するとともに接合部の外方を確実に押さえてエアバッグの膨張時の展開圧力をテアライン及び弱部に確実に作用させ、テアライン及び弱部から対向部本体及び表皮部を確実に破断させることができる。 According to the cover of the airbag apparatus 請 Motomeko 2 wherein, in addition to the effect of the cover body of an airbag apparatus according to claim 1, projecting projecting from the opposite body along the protruding direction of the airbag By arranging the part along the outside of the joint part, the bulkiness of the skin part due to the superposition of a part of the plurality of skin parts can be absorbed by the protrusion part, and the appearance can be improved, and the facing at the position of this protrusion part. The thickness of the body of the section ensures strength against the deployment pressure when the airbag is inflated, and the outside of the joint is securely pressed to ensure that the inflation pressure when the airbag is inflated acts on the tear line and the weak portion. It is possible to reliably break the opposing body and the skin from the tear line and the weak portion.

本発明の第１の実施の形態のエアバッグ装置のカバー体を示す斜視図である。It is a perspective view which shows the cover body of the airbag apparatus of the 1st Embodiment of this invention. （ａ）は同上カバー体の斜視断面図、（ｂ）は同上カバー体の断面図である。(A) is a perspective sectional view of the same cover body, (b) is a sectional view of the same cover body. （ａ）は同上カバー体のカバー本体の斜視図、（ｂ）は同上カバー体の表皮部の斜視図である。(A) is a perspective view of a cover body of the same cover body, and (b) is a perspective view of a skin part of the same cover body. （ａ）ないし（ｃ）は同上カバー体がエアバッグの膨張展開により開裂していく状態を順に示す正面図である。(A) thru|or (c) is a front view which shows in order the state which a cover body is cleaving by expansion deployment of an airbag same as the above. 同上カバー体αを備えたハンドルを示す斜視図である。It is a perspective view showing a handle provided with the same cover body α. （ａ）は本発明の第２の実施の形態のエアバッグ装置のカバー体の斜視断面図、（ｂ）は同上カバー体の断面図である。(A) is a perspective sectional view of a cover body of an airbag device according to a second embodiment of the present invention, and (b) is a sectional view of the same cover body. （ａ）は同上カバー体のカバー本体の斜視図、（ｂ）は同上カバー体の表皮部の斜視図である。(A) is a perspective view of a cover body of the same cover body, (b) is a perspective view of a skin part of the same cover body.

以下、本発明のエアバッグ装置のカバー体の第１の実施の形態を図面を参照して説明する。 Hereinafter, a first embodiment of a cover body of an airbag device of the present invention will be described with reference to the drawings.

図５において、10は車両である自動車のハンドルとしてのステアリングホイールで、このステアリングホイール10は、ステアリングホイール本体11と、このステアリングホイール本体11の乗員側に装着されるエアバッグ装置12とを備えている。なお、ステアリングホイール10は、通常傾斜した状態で車両に備えられるステアリングシャフトに装着されるものであるが、以下、車両の直進状態を基準とし、ステアリングシャフト側を背面側、乗員側を正面側とし、フロントガラスに向かう方向（矢印Ａ方向）を上側として説明する。 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 and an airbag device 12 mounted on the occupant side of the steering wheel main body 11. There is. The steering wheel 10 is normally mounted on a steering shaft that is provided in the vehicle in a tilted state.Hereinafter, the steering shaft side is the back side and the occupant side is the front side with reference to the straight traveling state of the vehicle. , The direction toward the windshield (the direction of arrow A) will be described as the upper side.

そして、ステアリングホイール本体11は、円環状をなす把持部であるグリップ部であるリム部14と、このリム部14の内側に位置するボス部15と、これらリム部14とボス部15とを連結する複数の、本実施の形態では３本のスポーク部16とから構成されている。そして、本実施の形態では、スポーク部16は、直進状態で、ボス部15の上部両側と下部とに配置されている。 Then, the steering wheel main body 11 connects the rim portion 14, which is a grip portion that 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 to each other. In this embodiment, a plurality of spokes 16 are provided. Further, in the present embodiment, the spoke portions 16 are arranged on both upper and lower sides of the boss portion 15 in a straight traveling state.

また、図示しないが、ボス部15の背面部には、ステアリングシャフトに嵌着される略円筒状のボスが設けられているとともに、このボスに芯体を構成するボスプレートがマグネシウム合金などをダイカストで鋳ぐるむなどして一体的に固着されている。そして、このボスプレートから、スポーク部16の芯金が一体に延設され、あるいは溶接などして固着されている。さらに、このスポーク部16の芯金に、リム部14の芯金が溶接などして固着されている。また、これらリム部14の芯金の外周部と、スポーク部16の芯金のリム部14側の部分の外周部とには、被覆部が形成され、さらに、この被覆部の外周の全部あるいは一部が、天然あるいは人工の皮革などの表皮により覆われている。 Further, although not shown, a substantially cylindrical boss fitted to the steering shaft is provided on the back surface of the boss portion 15, and the boss plate constituting the core body of this boss is made of a die-cast magnesium alloy or the like. It is integrally fixed by casting around. Then, the cored bar of the spoke portion 16 is integrally extended from the boss plate, or is fixed by welding or the like. Further, the core metal of the rim portion 14 is fixed to the core metal of the spoke portion 16 by welding or the like. Further, a covering portion is formed on the outer peripheral portion of the core metal of these rim portions 14 and the outer peripheral portion of the portion of the spoke portion 16 on the rim portion 14 side of the core metal, and further, the entire outer periphery of the covering portion or A part is covered with an epidermis such as natural or artificial leather.

一方、エアバッグ装置12は、エアバッグモジュールとも呼ばれ、ステアリングホイール本体11のボス部15の正面側を覆うように配置されるもので、金属板などからなる被取付部材としてのベースプレート、袋状のエアバッグ18（図４（ｂ））、ガスを噴射するインフレータなどを備えるとともに、図１に示すカバー体20を備えている。そして、ベースプレートは、ホーンプレートあるいはブラケット部などを介してステアリングホイール本体11に取り付けられ、このベースプレートに、エアバッグ18（図４（ｂ））、インフレータ、及びカバー体20が取り付けられ、小さく折り畳まれたエアバッグ18（図４（ｂ））がカバー体20により覆われている。 On the other hand, the airbag device 12 is also referred to as an airbag module and is arranged so as to cover the front side of the boss portion 15 of the steering wheel body 11, and is a base plate or a bag-like member to be attached made of a metal plate or the like. The airbag 18 (FIG. 4B), an inflator for injecting gas, and the like are provided, and the cover body 20 shown in FIG. 1 is provided. The base plate is attached to the steering wheel body 11 via a horn plate or a bracket portion, and the airbag 18 (FIG. 4(b)), the inflator, and the cover body 20 are attached to the base plate, and the base plate is folded small. The airbag 18 (FIG. 4B) is covered with a cover body 20.

そして、カバー体20は、ケース体、パッド、あるいはモジュールカバーなどとも呼ばれるもので、例えばＴＰＯなどの合成樹脂により一体に形成されたカバー本体21（図３（ａ））と、このカバー本体21を一体に覆う表皮部22（図３（ｂ））とを備えている。 The cover body 20 is also called a case body, a pad, a module cover, or the like. For example, the cover body 21 (FIG. 3A) integrally formed of synthetic resin such as TPO and the cover body 21 It has an outer skin portion 22 (FIG. 3B) that integrally covers it.

図３（ａ）に示すカバー本体21は、ボス部15（図５）及びスポーク部16（図５）の一部を覆う対向部としての表板部25と、この表板部25の背面（裏面）から正面視略角筒状などの筒状に突設された周壁である周板部26とを備えている。そして、カバー体20（図１）の表板部25と周板部26とに囲まれた部分が、折り畳んだエアバッグ18（図４（ｂ））を収納するエアバッグ収納部となり、このエアバッグ収納部の正面側に臨む部分に装飾部材としてのエンブレム27（図１）が備えられている。このエンブレム27は、必須の構成ではない。また、表板部25には、エアバッグ収納部にテアライン28が形成されている。 The cover body 21 shown in FIG. 3A includes a front plate portion 25 as an opposing portion that covers a part of the boss portion 15 (FIG. 5) and the spoke portions 16 (FIG. 5), and a back surface of the front plate portion 25 ( And a peripheral plate portion 26 which is a peripheral wall protruding from the rear surface) into a tubular shape such as a generally rectangular tubular shape in a front view. The portion of the cover body 20 (FIG. 1) surrounded by the front plate portion 25 and the peripheral plate portion 26 serves as an airbag storage portion for storing the folded airbag 18 (FIG. 4(b)). An emblem 27 (FIG. 1) as a decorative member is provided in a portion facing the front side of the bag storage portion. This emblem 27 is not an essential component. Further, a tear line 28 is formed in the airbag storage portion of the front plate portion 25.

表板部25は、意匠上種々の構成を採り得るものであるが、本実施の形態では、表板部25は、ほぼボス部15（図５）の形状に沿って、正面視で周板部26よりも若干大きく形成された対向部本体としての正面板部31と、この正面板部31の上端部に連続しこの正面板部31の上端部から背面側（反乗員側）に向かって延びる延出部としての延出板部32とを一体に備えている。 The front plate portion 25 can take various configurations in design, but in the present embodiment, the front plate portion 25 substantially surrounds the shape of the boss portion 15 (FIG. 5) and is a peripheral plate in a front view. A front plate portion 31 as a facing portion main body formed slightly larger than the portion 26, and continuous from the upper end portion of the front plate portion 31 toward the rear side (anti-occupant side) from the upper end portion of the front plate portion 31. The extending plate portion 32 as an extending portion is provided integrally.

正面板部31は、エアバッグ収納部に対向する領域が、相対的に窪んだ段差部33となっており、この段差部33の周縁部がこの段差部33に対して相対的にエアバッグ18（図４（ｂ））の突出方向である正面側に突出する突出部34となっている。すなわち、突出部34は、段差部33の周囲を囲む環状（円環状）に形成されている。例えば、図２（ｂ）に示すように、この突出部34の段差部33に対する突出寸法Ｌは、１．６ｍｍに設定されている。また、この正面板部31には、エンブレム27（図１）を取り付けるための穴部35が設けられている。 The front plate portion 31 has a stepped portion 33 in which a region facing the airbag storage portion is relatively recessed, and a peripheral portion of the stepped portion 33 is relatively in the airbag 18 with respect to the stepped portion 33. It is a protruding portion 34 that protrudes to the front side, which is the protruding direction of FIG. 4B. That is, the protruding portion 34 is formed in a ring shape (circular ring shape) surrounding the step portion 33. For example, as shown in FIG. 2B, the protrusion dimension L of the protrusion 34 with respect to the step portion 33 is set to 1.6 mm. Further, the front plate portion 31 is provided with a hole portion 35 for attaching the emblem 27 (FIG. 1).

テアライン28は、テア、テア溝、破断予定部、開裂予定溝、扉予定線部あるいは破断部などとも呼び得る薄肉部で、表板部25の正面板部31の背面（裏面）側を溝状に凹設し、表板部25の他の部分より脆弱で、破断可能及び変形容易な弱部として形成されている。そして、表板部25において、このテアライン28により外縁部が区画された部分が例えば複数の、本実施の形態では３つの扉予定部37となっているとともに、このテアライン28の外方、すなわち扉予定部37の周辺が非展開部である外郭部38となっている。また、このテアライン28は、設定したい扉予定部37の形状及び枚数に応じて任意に設定できるが、例えば本実施の形態では、正面板部31の外縁部に沿って両側部に形成された（一方の）縁部テアライン部である両側の側部テアライン部41，41と、エンブレム27の下部に沿って正面板部31の中央部で側部テアライン部41，41間を連結する（一方の）連結テアライン部である横連結テアライン部42と、この横連結テアライン部42の左右方向の略中央部であるエンブレム27の下方の位置から下方へと直線状に延出する（他方の）連結テアライン部である縦連結テアライン部43と、この縦連結テアライン部43の下端部から正面板部31の下縁部に沿って左右方向に延びる（他方の）縁部テアライン部である下部テアライン部44とを備えている。したがって、側部テアライン部41，41及び下部テアライン部44に対して、横連結テアライン部42及び縦連結テアライン部43が表板部25（正面板部31）の中央部側に位置し、収納状態のエアバッグ18（図４（ｂ））と対向して配置されている。 The tear line 28 is a thin portion that can also be referred to as a tear, a tear groove, a to-be-broken portion, a to-be-broken groove, a to-be-door line portion, or a to-be-broken portion. It is formed as a weak portion that is fragile than other portions of the front plate portion 25 and is rupturable and easily deformable. Then, in the front plate portion 25, a portion of which the outer edge portion is partitioned by the tear line 28 is, for example, a plurality of, in the present embodiment, three planned door portions 37, and the outside of the tear line 28, that is, the door. The periphery of the planned part 37 is an outer shell part 38 which is a non-deployed part. Further, the tear line 28 can be arbitrarily set according to the shape and number of the expected door portions 37 to be set, but in the present embodiment, for example, it is formed on both sides along the outer edge of the front plate portion 31 ( One side) The side tear line portions 41, 41 on both sides, which are the edge tear line portions, and the side tear line portions 41, 41 are connected at the central portion of the front plate portion 31 along the lower portion of the emblem 27 (one). A horizontal connection tear line portion 42 that is a connection tear line portion and a connection tear line portion that linearly extends downward from a position below the emblem 27 that is a substantially central portion of the horizontal connection tear line portion 42 in the left-right direction. A vertical connection tear line portion 43 and a lower tear line portion 44 which is an edge tear line portion extending in the left-right direction from the lower end portion of the vertical connection tear line portion 43 along the lower edge portion of the front plate portion 31. I have it. Therefore, with respect to the side tear line portions 41, 41 and the lower tear line portion 44, the horizontal connecting tear line portion 42 and the vertical connecting tear line portion 43 are located on the central portion side of the front plate portion 25 (the front plate portion 31), and are stored. Is arranged so as to face the airbag 18 (FIG. 4B).

側部テアライン部41は、主テアライン部とも呼び得るもので、表板部25の正面板部31の位置で両側外方に膨出する略円弧状に形成されている。すなわち、この側部テアライン部41は、表板部25（正面板部31）の外縁部である両側縁部に沿って形成されている。なお、側部テアライン部41のいずれかの端部は、例えば開裂の進行を抑制するために折り返すように湾曲されていてもよい。 The side tear line portion 41, which can also be called a main tear line portion, is formed in a substantially arc shape that bulges outward on both sides at the position of the front plate portion 31 of the front plate portion 25. That is, the side tear line portions 41 are formed along both side edge portions which are outer edge portions of the front plate portion 25 (front plate portion 31). Note that either end of the side tear line portion 41 may be curved so as to be folded back, for example, in order to suppress the progress of cleavage.

横連結テアライン部42は、扉予定部37を上下に区画する区画テアライン部とも呼び得るもので、側部テアライン部41，41から両側方向の中央部に向かって直線状に延びる直線部42a，42aと、これら直線部42a，42a間を連結しエンブレム27を下方に湾曲して迂回する迂回部42bとを有している。直線部42a，42aは、それぞれ側部テアライン部41，41の上下方向の中央部と連結されており、これら側部テアライン部41，41に対して交差する左右方向に延びている。したがって、テアライン28は、側部テアライン部41，41と横連結テアライン部42との交差部で屈曲（略直交）している。 The lateral connection tear line portion 42 can also be referred to as a division tear line portion that divides the planned door portion 37 into upper and lower portions, and linear portions 42a and 42a that linearly extend from the side tear line portions 41 and 41 toward the central portion in both directions. And a detour section 42b that connects the straight sections 42a, 42a and curves the emblem 27 downward to detour. The linear portions 42a, 42a are connected to the vertical center portions of the side tear line portions 41, 41, respectively, and extend in the left-right direction intersecting the side tear line portions 41, 41. Therefore, the tear line 28 is bent (substantially orthogonal) at the intersection of the side tear line portions 41, 41 and the lateral connecting tear line portion 42.

縦連結テアライン部43は、扉予定部37を左右に分割する分割テアライン部とも呼び得るもので、横連結テアライン部42の迂回部42bから下方に向けて直線状に延出している。また、この縦連結テアライン部43は、例えば側部テアライン部41の下端部よりも下方まで延出して表板部25の正面板部31の下端部近傍まで延び、下部テアライン部44と連結されている。したがって、この縦連結テアライン部43は、横連結テアライン部42と下部テアライン部とを連結している。このため、この縦連結テアライン部43は、横連結テアライン部42とともに、側部テアライン部41と下部テアライン部44とを連結している。換言すれば、テアライン28は、縦連結テアライン部43と下部テアライン部44との交差部で屈曲（略直交）している。 The vertical connection tear line portion 43 can also be referred to as a split tear line portion that divides the planned door portion 37 into left and right parts, and extends linearly downward from the bypass portion 42b of the horizontal connection tear line portion 42. The vertically connected tear line portion 43 extends, for example, below the lower end portion of the side tear line portion 41, extends to the vicinity of the lower end portion of the front plate portion 31 of the front plate portion 25, and is connected to the lower tear line portion 44. There is. Therefore, the vertical connection tear line portion 43 connects the horizontal connection tear line portion 42 and the lower tear line portion. Therefore, the vertical connection tear line portion 43 connects the side connection tear line portion 41 and the lower tear line portion 44 together with the horizontal connection tear line portion 42. In other words, the tear line 28 is bent (substantially orthogonal) at the intersection of the vertically connected tear line portion 43 and the lower tear line portion 44.

下部テアライン部44は、扉予定部37の下部を区画するもので、表板部25の正面板部31の位置で下方に膨出する略円弧状に形成されている。すなわち、この下部テアライン部44は、表板部25（正面板部31）の外縁部である下縁部に沿って形成されている。なお、下部テアライン部44の両端部は、例えば開裂の進行を抑制するために折り返すように湾曲されていてもよい。 The lower tear line portion 44 partitions the lower portion of the planned door portion 37, and is formed in a substantially arc shape that bulges downward at the position of the front plate portion 31 of the front plate portion 25. That is, the lower tear line portion 44 is formed along the lower edge portion which is the outer edge portion of the front plate portion 25 (front plate portion 31). Both ends of the lower tear line portion 44 may be curved so as to be folded back in order to suppress the progress of cleavage, for example.

また、各扉予定部37は、通常時に折り畳んで収納されたエアバッグ18（図４（ｂ））の膨出側を覆い、エアバッグ18（図４（ｂ））の膨出時にはテアライン28から破断されて表板部25に扉部45（図４（ｃ））を構成する部分である。各扉予定部37は、エアバッグ18（図４（ｂ））を所望の展開特性で展開させることができれば任意の形状とすることができるが、本実施の形態では、それぞれテアライン28により区画されて表板部25の上部に１つ、下部の左右両側に１つずつ、それぞれ形成されている。 In addition, each planned door portion 37 covers the bulging side of the airbag 18 (FIG. 4B) that is normally folded and stored, and from the tear line 28 when the airbag 18 (FIG. 4B) bulges. This is a portion that is broken to form the door portion 45 (FIG. 4C) on the front plate portion 25. Each of the planned door portions 37 can have any shape as long as it can deploy the airbag 18 (FIG. 4B) with desired deployment characteristics, but in the present embodiment, it is divided by the tear lines 28, respectively. One is formed on the upper side of the front plate portion 25, and one is formed on both left and right sides of the lower portion.

そして、側部テアライン部41，41の上端部間、及び、側部テアライン部41，41の下端部と下部テアライン部44の両端部との間が、それぞれ扉部45（図４（ｃ））が正面側に展開する際の回動軸となるヒンジ部47，48，49となっている。すなわち、表板部25の外周部のテアライン28が形成されていない部分が、展開した扉部45（図４（ｃ））を、非展開部である周板部26及び外郭部38に連接するようになっている。 The door portion 45 is provided between the upper end portions of the side tear line portions 41, 41 and between the lower end portions of the side tear line portions 41, 41 and both end portions of the lower tear line portion 44 (FIG. 4C). Are hinges 47, 48, 49 which are pivotal axes when they are deployed to the front side. That is, a portion of the outer peripheral portion of the front plate portion 25 where the tear line 28 is not formed connects the expanded door portion 45 (FIG. 4C) to the peripheral plate portion 26 and the outer shell portion 38 which are non-expanded portions. It is like this.

図３（ｂ）に示す表皮部22は、表板部25の表面側を覆って外観や触感を向上するもので、複数、本実施の形態では一対の表皮体である一及び他の表皮体51，52により構成されており、これら一及び他の表皮体51，52が重ねられて接合される接合部53が形成され、かつ、いずれかの表皮体51，52、本実施の形態では一の表皮体51の背面側に弱部54が形成されている。 The outer skin 22 shown in FIG. 3B covers the surface side of the outer skin 25 to improve the appearance and feel, and a plurality of skin skins, one and the other skin skins being a pair of skin skins in this embodiment. 51, 52, and one or other of these skins 51, 52 are overlapped to form a joint portion 53, and any one of the skins 51, 52, in this embodiment, is formed. A weak portion 54 is formed on the back side of the epidermis 51.

一及び他の表皮体51，52は、天然皮革、人工皮革、あるいは軟質の樹脂などによりシート状に形成されている。なお、これら一及び他の表皮体51，52は、同じ材質のものでもよいし、互いに異なる材質のものでもよい。 The one and the other skins 51, 52 are made of natural leather, artificial leather, or a soft resin in a sheet shape. The one and the other skins 51 and 52 may be made of the same material or different materials.

一の表皮体51は、表板部25の主意匠を構成するもので、略円形状に形成されている。すなわち、一の表皮体51は、表板部25において、正面板部31の略中央部に位置する段差部33の表面を面状に覆っている。このため、一の表皮体51は、図３（ａ）に示すテアライン28、すなわち側部テアライン部41，41、横連結テアライン部42、縦連結テアライン部43及び下部テアライン部44をそれぞれ覆っている。また、図３（ｂ）に示すように、一の表皮体51の中央部には、穴部35（図３（ａ））と連通しエンブレム27（図１）が取り付けられる通孔55が開口されている。さらに、図２（ａ）及び図２（ｂ）に示すように、一の表皮体51の外縁部は、他の表皮体52に対して重ねられて接合される一の重ね部56となっている。この一の重ね部56は、段差部33の外縁部に位置し、突出部34の側面に対向して位置している。 The first skin 51 constitutes the main design of the front plate portion 25 and is formed in a substantially circular shape. That is, the one skin 51 covers the surface of the step portion 33 located in the substantially central portion of the front plate portion 31 in the front plate portion 25 in a planar manner. Therefore, the one skin 51 covers the tear lines 28 shown in FIG. 3A, that is, the side tear line portions 41, 41, the lateral connection tear line portions 42, the vertical connection tear line portions 43, and the lower tear line portions 44, respectively. .. Further, as shown in FIG. 3( b ), a through hole 55, which communicates with the hole portion 35 (FIG. 3( a )) and is attached with the emblem 27 (FIG. 1 ), is opened at the center of one skin 51. Has been done. Further, as shown in FIGS. 2(a) and 2(b), the outer edge portion of one epidermis 51 becomes one superposed portion 56 which is superposed and joined to another epidermis 52. There is. The one overlapping portion 56 is located at the outer edge portion of the step portion 33, and is located opposite to the side surface of the protruding portion 34.

また、他の表皮体52は、一の表皮体51の周囲を囲むもので、略円環状に形成され、一の表皮体51を露出させる露出開口部57が中央部に開口されている。すなわち、他の表皮体52は、表板部25において、正面板部31の周縁部に位置する突出部34及び延出板部32に亘る部分の表面を覆っている。このため、他の表皮体52は、図３（ａ）に示すテアライン28、すなわち側部テアライン部41，41、横連結テアライン部42、及び縦連結テアライン部43の外方に位置している。さらに、図２（ａ）及び図２（ｂ）に示すように、他の表皮体52は、露出開口部57の内縁部が一の表皮体51の一の重ね部56に重ねられて接合される他の重ね部58となっている。他の重ね部58は、他の表皮体52の背面側（裏面側）に折り返されて巻き込まれた巻き込み部であり、突出部34から段差部33側に突出した位置で一の重ね部56の表面に直接重ねられる背面側の巻き込み片部58aと、この巻き込み片部58aの表面側に位置する意匠側片部58bとを備えた二重構造となっている。 Further, the other skin body 52 surrounds the periphery of the one skin body 51, is formed in a substantially annular shape, and has an exposure opening 57 for exposing the one skin body 51 opened in the central portion. That is, the other skin body 52 covers the surface of the portion of the front plate portion 25 that extends over the projecting portion 34 and the extending plate portion 32 located at the peripheral edge portion of the front plate portion 31. Therefore, the other skin body 52 is located outside the tear line 28 shown in FIG. 3A, that is, the side tear line portions 41, 41, the lateral connecting tear line portion 42, and the vertical connecting tear line portion 43. Further, as shown in FIGS. 2A and 2B, in the other skin 52, the inner edge portion of the exposure opening 57 is overlapped and joined to the one overlap portion 56 of the one skin 51. It is another overlapping part 58. The other overlapping portion 58 is a winding portion that is folded back and wound around the back surface side (back surface side) of the other skin body 52, and the one overlapping portion 56 at the position protruding from the protruding portion 34 toward the step portion 33 side. It has a double structure including a back-side winding piece portion 58a directly superposed on the surface and a design-side piece portion 58b located on the front surface side of the winding piece portion 58a.

そして、接合部53は、一の表皮体51の一の重ね部56と他の表皮体52の他の重ね部58とに加えて、一の重ね部56と他の重ね部58の巻き込み片部58aとを一体的に縫製して接合する縫製部である第１の縫製部61と、一の表皮体51の一の重ね部56と他の表皮体52の巻き込み片部58a及び意匠側片部58bとを一体的に縫製して接合する縫製部である第２の縫製部62とを備えている。すなわち、本実施の形態では、接合部53は、一の表皮体51と他の表皮体52とを縫い合わせて接合する縫い部として形成されている。さらに、この接合部53は、一の表皮体51及び他の表皮体52がカバー本体21（表板部25）に対して帯状に貼り付けられて固定されている。したがって、この接合部53は、いわば擬似的な剛体となっている。 The joining portion 53 includes, in addition to the one overlapping portion 56 of the one outer skin 51 and the other overlapping portion 58 of the other outer skin 52, the winding piece portion of the one overlapping portion 56 and the other overlap portion 58. The first sewn portion 61, which is a sewn portion that integrally sewes and joins the 58a, the one overlapping portion 56 of the one outer skin body 51, and the winding piece portion 58a and the design side piece portion of the other outer skin body 52. 58b and a second sewing portion 62 which is a sewing portion that is integrally sewn and joined. That is, in the present embodiment, the joint portion 53 is formed as a sewn portion that stitches and joins the one epidermis body 51 and the other epidermis body 52. Further, in this joint portion 53, the one outer skin body 51 and the other outer skin body 52 are attached to and fixed to the cover body 21 (the cover plate portion 25) in a band shape. Therefore, this joint 53 is, so to speak, a pseudo rigid body.

第１及び第２の縫製部61，62は、それぞれ他の表皮体52の露出開口部57（他の重ね部58）に沿って、すなわち一の表皮体51の一の重ね部56、換言すれば一の表皮体51と他の表皮体52との互いに重ねられる縁部に沿って環状（円環状）に形成されている。そして、これら第１及び第２の縫製部61，62は、図３（ａ）に示すテアライン28、すなわち側部テアライン部41，41、横連結テアライン部42、縦連結テアライン部43及び下部テアライン部44の外方を囲んで位置している。 The first and second sewn portions 61, 62 are respectively along the exposed openings 57 (other overlapping portions 58) of the other outer skin body 52, that is, one overlapping portion 56 of one outer skin body 51, in other words, For example, the one outer skin body 51 and the other outer skin body 52 are formed in an annular shape (circular ring shape) along the overlapping edge portions. The first and second sewn portions 61, 62 are the tear lines 28 shown in FIG. 3A, that is, the side tear line portions 41, 41, the horizontal connecting tear line portions 42, the vertical connecting tear line portions 43, and the lower tear line portions. It is located around the outside of 44.

第１の縫製部61は、仮縫い部とも呼び得るもので、巻き込み片部58aの先端側（自由端側）、すなわち意匠側片部58bと連続する側と反対側の位置、換言すれば第２の縫製部62に対して露出開口部57と反対側（外方）に離間された位置に設けられている。この第１の縫製部61は、一及び他の表皮体51，52（一の重ね部56及び巻き込み片部58a）を厚み方向に貫通する複数の孔部61aと、１つおきに隣接する孔部61a，61a間に連続して通された縫い糸61bとにより構成されている。 The first sewn portion 61 can also be called a tentatively sewn portion, and is located at the tip end side (free end side) of the winding piece portion 58a, that is, the position opposite to the side continuous with the design side piece portion 58b, in other words, the second It is provided at a position separated (outward) from the exposed opening 57 with respect to the sewn portion 62. The first sewn portion 61 includes a plurality of hole portions 61a penetrating one and the other skins 51, 52 (the one overlapping portion 56 and the winding piece portion 58a) in the thickness direction, and holes adjacent to each other. It is composed of a sewing thread 61b which is continuously passed between the portions 61a and 61a.

孔部61aは、一の表皮体51の外縁部（一の重ね部56）、すなわち露出開口部57の周方向に互いに略等間隔に離間されて、図示しない工業用ミシンなどの縫製装置の縫い針によってミシン目状に形成された針孔である。これら孔部61aは、他の表皮体52の巻き込み片部58a及び一の表皮体51の一の重ね部56を貫通して、換言すれば一及び他の表皮体51，52を１枚分ずつ貫通して形成されている。 The hole portions 61a are spaced from each other at substantially equal intervals in the circumferential direction of the outer edge portion (one overlapping portion 56) of the one outer skin body 51, that is, the exposed opening portion 57, and are sewn in a sewing device such as an industrial sewing machine (not shown). It is a needle hole formed in a perforated shape by a needle. These hole portions 61a penetrate the winding piece portion 58a of the other epidermis 52 and the overlapping portion 56 of the one epidermis 51, in other words, one and the other epidermis 51, 52 one by one. It is formed to penetrate.

縫い糸61bは、一の重ね部56と他の重ね部58の巻き込み片部58aとに亘って孔部61aに通されてこれら一の重ね部56と他の重ね部58の巻き込み片部58aとを厚み方向に一体的に縫い付けるものである。したがって、この縫い糸61b（第１の縫製部61）は、他の表皮体52の他の重ね部58の意匠側片部58bにより覆われ、他の表皮体52（他の重ね部58の意匠側片部58b）の背面側に隠れて乗員側から見えないようになっている。 The sewing thread 61b is passed through the hole portion 61a over the one overlapping portion 56 and the winding piece portion 58a of the other overlapping portion 58 to connect the one overlapping portion 56 and the winding piece portion 58a of the other overlapping portion 58. It is sewn integrally in the thickness direction. Therefore, the sewing thread 61b (first sewing portion 61) is covered by the design side piece 58b of the other overlapping portion 58 of the other skin body 52, and the other skin body 52 (the design side of the other overlapping portion 58). It is hidden behind the one side 58b) so that it cannot be seen from the passenger side.

また、第２の縫製部62は、飾り縫い部、あるいはステッチ部などとも呼び得るもので、巻き込み片部58aの基端側の位置、換言すれば第１の縫製部61に対して露出開口部57側（内方）に離間された位置に設けられている。この第２の縫製部62は、一及び他の表皮体51，52（一及び他の重ね部56，58）を厚み方向に貫通する脆弱部である複数の孔部62aと、これら孔部62a間に連続して通された縫い糸62bとにより構成されている。なお、この第２の縫製部62は、必須の構成ではない。 The second sewn portion 62 can also be called a decorative stitched portion, a stitched portion, or the like, and is located at the position on the proximal end side of the winding piece portion 58a, in other words, the exposed opening portion with respect to the first sewn portion 61. It is provided at a position separated on the 57 side (inward). The second sewn portion 62 has a plurality of hole portions 62a which are fragile portions that penetrate the one and the other skin bodies 51 and 52 (the one and the other overlapping portions 56 and 58) in the thickness direction, and the hole portions 62a. It is composed of a sewing thread 62b which is continuously passed between them. The second sewing portion 62 is not an essential component.

孔部62aは、一の表皮体51の外縁部（一の重ね部56）、すなわち露出開口部57の周方向に互いに略等間隔に離間されて、図示しない工業用ミシンなどの縫製装置の縫い針によってミシン目状に形成された針孔である。これら孔部62aは、他の表皮体52の他の重ね部58（巻き込み片部58a及び意匠側片部58b）及び一の表皮体51の一の重ね部56を貫通して、換言すれば一の表皮体51を１枚分、他の表皮体52を２枚分貫通して形成されている。 The hole portions 62a are spaced from each other at substantially equal intervals in the circumferential direction of the outer edge portion (one overlapping portion 56) of the one outer skin body 51, that is, the exposed opening portion 57, and are sewn in a sewing device such as an industrial sewing machine (not shown). It is a needle hole formed in a perforated shape by a needle. These hole portions 62a penetrate the other overlapping portion 58 (the winding piece portion 58a and the design side piece portion 58b) of the other skin body 52 and the one overlapping portion 56 of the one skin body 51, in other words, The outer skin 51 is formed by penetrating one skin and the other skin 52 is formed by penetrating two skins.

縫い糸62bは、一の重ね部56と他の重ね部58（巻き込み片部58a及び意匠側片部58b）とに亘って孔部62aに通されてこれら一の重ね部56と他の重ね部58（巻き込み片部58a及び意匠側片部58b）を厚み方向に一体的に縫い付けるものである。したがって、この縫い糸62b（第２の縫製部62）は、他の表皮体52の表面側に露出して意匠性を高めるようになっている。 The sewing thread 62b is passed through the hole portion 62a so as to extend over the one overlapping portion 56 and the other overlapping portion 58 (the winding piece portion 58a and the design side piece portion 58b), and the one overlapping portion 56 and the other overlapping portion 58. The winding piece portion 58a and the design side piece portion 58b are integrally sewn in the thickness direction. Therefore, the sewing thread 62b (second sewing portion 62) is exposed on the surface side of the other skin body 52 to enhance the design.

弱部54は、本実施の形態では一の表皮体51の背面側を溝状に凹設した薄肉部であり、一の表皮体51の他の部分より脆弱で破断及び変形可能に形成されている。この弱部54は、図３（ａ）に示すテアライン28、すなわち側部テアライン部41，41、横連結テアライン部42、縦連結テアライン部43及び下部テアライン部44と重なる位置、すなわちこのテアライン28と対向する位置に形成されている。したがって、この図３（ｂ）に示す弱部54は、側部テアライン部41，41（図３（ａ））と重なって両側部に形成された（一方の）縁部弱部としての両側の側部弱部65，65と、横連結テアライン部42（図３（ａ））と重なって左右方向に形成された（一方の）連結弱部としての横連結弱部66と、縦連結テアライン部43（図３（ａ））と重なって上下方向に形成された（他方の）連結弱部としての縦連結弱部67と、下部テアライン部44（図３（ａ））と重なって左右方向に形成された（他方の）縁部弱部としての下部弱部68とを備えている。したがって、側部弱部65，65及び下部弱部68に対して、横連結弱部66及び縦連結弱部67が表皮部22（一の表皮体51）の中央部側に位置し、収納状態のエアバッグ18（図４（ｂ））と重なる位置に配置されている。 In the present embodiment, the weak portion 54 is a thin-walled portion in which the back surface side of the one skin 51 is provided in a groove shape, and is formed so as to be more fragile and breakable and deformable than the other portions of the one skin 51. There is. The weak portion 54 overlaps the tear line 28 shown in FIG. 3A, that is, the side tear line portions 41, 41, the horizontal connecting tear line portion 42, the vertical connecting tear line portion 43, and the lower tear line portion 44, that is, the tear line 28. It is formed at a position facing each other. Therefore, the weak portion 54 shown in FIG. 3B overlaps with the side tear line portions 41, 41 (FIG. 3A) and is formed on both sides as one edge weak portion on both sides. The lateral weakened portions 65, 65 and the lateral connected weakened portions 66 as the (one) connected weakened portions formed in the left-right direction by overlapping the lateral connected weakened tear line portions 42 (FIG. 3A), and the vertical connected tear line portions. 43 (FIG. 3( a )) is vertically overlapped with the vertically weakened connection portion 67 as the (other) weakened connection portion, and the lower tear line portion 44 (FIG. 3( a )) is overlapped in the horizontal direction. The lower weak portion 68 is provided as the formed (other) edge weak portion. Therefore, with respect to the side weak portions 65, 65 and the lower weak portion 68, the lateral connection weak portion 66 and the vertical connection weak portion 67 are located on the central portion side of the skin portion 22 (one skin body 51), and are stored. Is arranged at a position overlapping the airbag 18 (FIG. 4B).

側部弱部65は、側部テアライン部41（図３（ａ））と略等しい形状、すなわち両側外方に膨出する略円弧状に形成されている。したがって、この側部弱部65は、露出開口部57の縁部、すなわち接合部53（第２の縫製部62）に対して所定の距離範囲内にて、この接合部53（第２の縫製部62）に沿ってそれぞれ形成されている。 The side weak portion 65 is formed in a shape that is substantially the same as the side tear line portion 41 (FIG. 3A), that is, a substantially arc shape that bulges outward on both sides. Therefore, the side weak portion 65 is within the predetermined distance range with respect to the edge portion of the exposed opening 57, that is, the joint portion 53 (second sewing portion 62). Formed along the section 62).

横連結弱部66は、横連結テアライン部42（図３（ａ））と略等しい形状、すなわち側部弱部65，65から両側方向の中央部に向かって直線状に延びる直線部66a，66aと、これら直線部66a，66a間を連結しエンブレム27（図１）を下方に湾曲して迂回する迂回部66bとを有している。直線部66a，66aは、それぞれ側部弱部65，65の上下方向の中央部と連結されており、これら側部弱部65，65に対して交差する左右方向に延びている。したがって、弱部54は、側部弱部65，65と横連結弱部66との交差部で屈曲（略直交）している。 The lateral connection weak portion 66 has substantially the same shape as the lateral connection tear line portion 42 (FIG. 3A), that is, the linear portions 66a and 66a linearly extending from the lateral weak portions 65 and 65 toward the central portions in both directions. And a detour portion 66b that connects the straight portions 66a, 66a and bends the emblem 27 (FIG. 1) downward to detour. The straight portions 66a, 66a are connected to the vertical center portions of the side weak portions 65, 65, respectively, and extend in the left-right direction intersecting the side weak portions 65, 65. Therefore, the weak portion 54 is bent (substantially orthogonal) at the intersection of the side weak portions 65, 65 and the lateral connection weak portion 66.

縦連結弱部67は、縦連結テアライン部43（図３（ａ））と略等しい形状、すなわち横連結弱部66の迂回部66bから下方に向けて直線状に延出している。また、この縦連結弱部67は、例えば側部弱部65の下端部よりも下方まで延出し、下部弱部68と連結されている。したがって、この縦連結弱部67は、横連結弱部66と下部弱部68とを連結している。このため、この縦連結弱部67は、横連結弱部66とともに、側部弱部65と下部弱部68とを連結している。換言すれば、弱部54は、縦連結弱部67と下部弱部68との交差部で屈曲（略直交）している。 The vertical connection weak portion 67 has a substantially same shape as the vertical connection tear line portion 43 (FIG. 3A), that is, extends straight downward from the detour portion 66b of the horizontal connection weak portion 66. In addition, the vertically connected weak portion 67 extends below the lower end of the side weak portion 65, for example, and is connected to the lower weak portion 68. Therefore, the vertical connection weak portion 67 connects the horizontal connection weak portion 66 and the lower weak portion 68. Therefore, the vertical connection weak portion 67 connects the lateral weak portion 65 and the lower side weak portion 68 together with the lateral connection weak portion 66. In other words, the weak portion 54 is bent (substantially orthogonal) at the intersection of the vertically connected weak portion 67 and the lower weak portion 68.

下部弱部68は、下部テアライン部44（図３（ａ））と略等しい形状、すなわち下方に膨出する略円弧状に形成されている。したがって、この下部弱部68は、露出開口部57の縁部、すなわち接合部53（第１及び第２の縫製部61，62）に対して所定の距離範囲内にて、この接合部53（第１及び第２の縫製部61，62）に沿ってそれぞれ形成されている。 The lower weak portion 68 is formed in a shape that is substantially the same as the lower tear line portion 44 (FIG. 3A), that is, a substantially arcuate shape that bulges downward. Therefore, the lower weak portion 68 is within a predetermined distance range with respect to the edge portion of the exposed opening 57, that is, the joint portion 53 (first and second sewn portions 61 and 62). They are formed along the first and second sewn portions 61, 62), respectively.

そして、図２（ｂ）に示すように、弱部54の側部弱部65及び下部弱部68は、接合部53（第１及び第２の縫製部61，62）に対して、所定の距離範囲内の近傍に位置している。具体的に、側部弱部65及び下部弱部68は、他の表皮体52の内縁部、すなわち巻き込み片部58aと意匠側片部58bとの連続部である露出開口部57（図２（ａ））の縁部に対して、０．５〜５．５ｍｍの距離範囲内とするとともに、接合部53（第１及び第２の縫製部61，62）に対して３．０ｍｍ〜１０．５ｍｍの距離範囲内とすることが好ましい。これは、巻き込み片部58aの折り返し長さやテアライン28（側部テアライン部41及び下部テアライン部44）の幅寸法を考慮すると、３．０ｍｍよりも小さくすることが容易でなく、１０．５ｍｍよりも長いと、エアバッグ18（図４（ｂ））の展開時の展開力に対して弱部54の近傍の強度が低下するためである。より具体的に、本実施の形態では、弱部54の側部弱部65及び下部弱部68（テアライン28の側部テアライン部41及び下部テアライン部44）と他の表皮体52の内縁部との距離Ｄ1が５．２ｍｍに設定され、他の表皮体52の内縁部と第２の縫製部62との距離Ｄ2が３．０ｍｍに設定されている。そのため、弱部54の側部弱部65及び下部弱部68（テアライン28の側部テアライン部41及び下部テアライン部44）と第２の縫製部62との距離Ｄ3（＝Ｄ1＋Ｄ2）が８．２ｍｍに設定されている。また、第２の縫製部62と第１の縫製部61との距離Ｄ4が２．０ｍｍに設定されている。この結果、弱部54の側部弱部65及び下部弱部68（テアライン28の側部テアライン部41及び下部テアライン部44）と第１の縫製部61との距離Ｄ5（＝Ｄ3＋Ｄ4）が１０．２ｍｍに設定されている。なお、一の表皮体51の一の重ね部56の先端部及び他の表皮体52の他の重ね部58の巻き込み片部58aの先端部は、略等しい位置となっており、突出部34からの距離Ｄ6が１．０ｍｍに設定されている。また、一の表皮体51の一の重ね部56の先端部及び他の表皮体52の他の重ね部58の巻き込み片部58aの先端部と第１の縫製部61との距離Ｄ7は、１．８ｍｍに設定されている。 Then, as shown in FIG. 2( b ), the side weak portion 65 and the lower weak portion 68 of the weak portion 54 are separated from the joint portion 53 (first and second sewing portions 61, 62) by a predetermined distance. It is located near the distance range. Specifically, the side weak portion 65 and the lower weak portion 68 are the inner edges of the other skin 52, that is, the exposed opening 57 (FIG. 2 (FIG. a)) within the distance range of 0.5 to 5.5 mm with respect to the edge portion, and 3.0 mm to 10.mm with respect to the joint portion 53 (first and second sewn portions 61 and 62). It is preferable to be within a distance range of 5 mm. Considering the folding length of the winding piece portion 58a and the width dimension of the tear line 28 (the side tear line portion 41 and the lower tear line portion 44), it is not easy to make it smaller than 3.0 mm and it is smaller than 10.5 mm. This is because if the length is long, the strength in the vicinity of the weak portion 54 decreases with respect to the deploying force when the airbag 18 (FIG. 4B) is deployed. More specifically, in the present embodiment, the side weak portion 65 and the lower weak portion 68 of the weak portion 54 (the side tear line portion 41 and the lower tear line portion 44 of the tear line 28) and the inner edge portion of the other epidermis 52 are provided. Is set to 5.2 mm, and the distance D2 between the inner edge portion of the other skin body 52 and the second sewn portion 62 is set to 3.0 mm. Therefore, the distance D3 (=D1+D2) between the side weak portion 65 of the weak portion 54 and the lower weak portion 68 (the side tear line portion 41 and the lower tear line portion 44 of the tear line 28) and the second sewing portion 62 is 8.2 mm. Is set to. The distance D4 between the second sewn portion 62 and the first sewn portion 61 is set to 2.0 mm. As a result, the distance D5 (=D3+D4) between the side weak portion 65 and the lower weak portion 68 of the weak portion 54 (the side tear line portion 41 and the lower tear line portion 44 of the tear line 28) and the first sewing portion 61 is 10. It is set to 2 mm. It should be noted that the tip end of the one overlapped portion 56 of the one skin 51 and the tip end of the winding piece 58a of the other overlapped portion 58 of the other skin 52 are located at substantially the same position, and from the protruding portion 34. The distance D6 is set to 1.0 mm. In addition, the distance D7 between the first sewing portion 61 and the tip of the one overlapping portion 56 of the one skin 51 and the tip of the winding piece 58a of the other overlapping portion 58 of the other skin 52 is 1 It is set to 0.8 mm.

そして、カバー体20の製造の際には、表板部25及び周板部26を備えるカバー本体21を予め合成樹脂により射出成形する。このとき、一及び他の表皮体51，52は、カバー本体21に対して一体的にインサート成形してもよいし、別途成形したカバー本体21に後工程で貼り付けてもよい。そして、一及び他の表皮体51，52により表板部25を覆ったカバー体20に対して、別途成形したエンブレム27を取り付ける。 Then, when the cover body 20 is manufactured, the cover body 21 including the front plate portion 25 and the peripheral plate portion 26 is injection-molded in advance with a synthetic resin. At this time, the one and the other skins 51 and 52 may be integrally insert-molded with the cover body 21, or may be attached to the separately-formed cover body 21 in a later step. Then, a separately molded emblem 27 is attached to the cover body 20 that covers the front plate portion 25 with the one and the other skin bodies 51 and 52.

このカバー体20を備えたエアバッグ装置12をステアリングホイール10に備えた自動車が衝突などすると、制御装置がインフレータを作動させ、図４（ｂ）に示すエアバッグ18にガスを供給する。すると、エアバッグ18が急速に膨張展開し、この膨張展開する圧力が各扉予定部37を押し上げ、テアライン28及び弱部54にエアバッグ18の膨張圧力が作用して、このテアライン28及び弱部54に沿ってカバー本体21の表板部25が一及び他の表皮体51，52と一体的に破断する。 When a vehicle equipped with the airbag device 12 having the cover body 20 on the steering wheel 10 collides, the control device actuates the inflator and supplies gas to the airbag 18 shown in FIG. 4B. Then, the airbag 18 is rapidly inflated and deployed, and the inflating and deploying pressure pushes up the planned door portions 37, and the inflation pressure of the airbag 18 acts on the tear line 28 and the weak portion 54 to cause the tear line 28 and the weak portion. The front plate portion 25 of the cover main body 21 is fractured along with 54 along with one and the other skin bodies 51, 52.

ここで、テアライン28及び弱部54は、その中央部から周辺部へと破断が進行していく。すなわち、テアライン28は、横連結テアライン部42の迂回部42bから直線部42a，42aへと左右方向に破断が進行していくとともに、縦連結テアライン部43が横連結テアライン部42の迂回部42bと連続する位置から下方に向かって破断が進行していく。同様に、弱部54では、テアライン28の横連結テアライン部42の迂回部42bから直線部42a，42aへの破断の進行に伴い、横連結弱部66の迂回部66bから直線部66aへと左右方向に破断が進行していくとともに、テアライン28の縦連結テアライン部43の破断の進行に伴い、縦連結弱部67が横連結弱部66の迂回部66bと連続する位置から下方に向かって破断が進行していく。この結果、図４（ａ）から図４（ｂ）に示すように、扉部45が形成されてエアバッグ18が膨出する。 Here, the tear line 28 and the weak portion 54 are progressively fractured from the central portion to the peripheral portion. That is, the tear line 28 is fractured in the left-right direction from the bypass portion 42b of the horizontal connecting tear line portion 42 to the straight portions 42a, 42a, and the vertical connecting tear line portion 43 becomes the bypass portion 42b of the horizontal connecting tear line portion 42. The fracture progresses downward from the continuous position. Similarly, in the weak portion 54, as the breakage from the detour portion 42b of the lateral connection tear line portion 42 of the tear line 28 to the straight line portions 42a, 42a progresses, the detour portion 66b of the lateral connection weak portion 66 moves straight to the straight portion 66a. As the rupture progresses in the direction, as the rupture of the vertical connection tear line part 43 of the tear line 28 progresses, the vertical connection weak part 67 ruptures downward from a position continuous with the bypass part 66b of the horizontal connection weak part 66. Is progressing. As a result, as shown in FIGS. 4A to 4B, the door 45 is formed and the airbag 18 bulges.

この後、テアライン28は、さらに、直線部42a，42aの端部から側部テアライン部41，41が上下に破断していくとともに、縦連結テアライン部43の下端部から下部テアライン部44が左右に破断していく。一方、弱部54は、テアライン28の直線部42a，42aの端部から側部テアライン部41，41への破断、及び、縦連結テアライン部43の下端部から下部テアライン部44への破断の進行に伴い、直線部66a，66aの端部及び縦連結弱部67の下端部から側部弱部65，65及び下部弱部68へと破断する際に、これら側部弱部65，65及び下部弱部68が一の表皮体51と他の表皮体52との接合部53に対して所定の距離範囲内でこの接合部53に沿っているため、カバー本体21に対して貼り付けられて固定されている接合部53と比較して相対的に弱い側部弱部65，65及び下部弱部68へと確実に展開力が作用し、直線部66a，66aの端部から側部弱部65，65が上下に破断していくとともに、縦連結弱部67の下端部から下部弱部68が左右に破断していく。 Thereafter, in the tear line 28, the side tear line portions 41, 41 are further broken up and down from the ends of the linear portions 42a, 42a, and the lower tear line portion 44 is moved left and right from the lower end of the vertically connected tear line portion 43. It will break. On the other hand, the weak portion 54 progresses from the ends of the straight portions 42a, 42a of the tear line 28 to the side tear line portions 41, 41 and from the lower end of the vertically connected tear line portion 43 to the lower tear line portion 44. Accordingly, when the end portions of the linear portions 66a, 66a and the lower end portion of the vertical connection weak portion 67 are broken into the side weak portions 65, 65 and the lower weak portion 68, the side weak portions 65, 65 and the lower portion are broken. Since the weak portion 68 is along the joining portion 53 within a predetermined distance range with respect to the joining portion 53 between the one outer skin body 51 and the other outer skin body 52, it is attached and fixed to the cover body 21. The deploying force reliably acts on the side weak portions 65, 65 and the lower weak portion 68, which are relatively weaker than the joined portion 53, so that the side weak portions 65 from the ends of the straight portions 66a, 66a. , 65 are broken up and down, and the lower weak portion 68 is broken left and right from the lower end of the vertically connected weak portion 67.

この結果、図４（ｂ）から図４（ｃ）に示すように、形成された扉部45が、ヒンジ部47，48，49を軸として回動してエアバッグを膨出させる開口である突出口69を形成し、この突出口69からエアバッグ18が乗員の前方に展開し、乗員を保護する。 As a result, as shown in FIGS. 4(b) to 4(c), the formed door portion 45 is an opening for rotating the hinge portions 47, 48, 49 as an axis to inflate the airbag. A protruding port 69 is formed, and the airbag 18 is deployed from the protruding port 69 in front of the occupant to protect the occupant.

このように、本実施の形態によれば、一及び他の表皮体51，52の一部同士が重ね合わせられて接合され表板部25に固定された接合部53に対して所定の距離範囲内でこの接合部53に沿って、テアライン28の少なくとも一部（側部テアライン部41，41及び下部テアライン部44）と重なる位置で一の表皮体51に弱部54（側部弱部65，65及び下部弱部68）を設けることで、エアバッグ18（図４（ｂ））の膨張時の展開圧力を弱部54に確実に作用させてこの弱部54の位置で破断させることができ、エアバッグ18（図４（ｂ））の膨張展開時に所定形状に破断可能となる。 As described above, according to the present embodiment, a predetermined distance range with respect to the joint portion 53 fixed to the front plate portion 25 by joining the one and the other outer skin bodies 51 and 52 with each other by overlapping them. Along the joint 53, the weak portion 54 (side weak portion 65, the side weak portion 65, the side weak portion 65, at a position overlapping at least a part of the tear line 28 (the side tear line portions 41, 41 and the lower tear line portion 44). By providing 65 and the lower weak portion 68), the deployment pressure when the airbag 18 (FIG. 4(b)) is inflated can be surely applied to the weak portion 54 so that it can be broken at the position of the weak portion 54. The airbag 18 (FIG. 4B) can be broken into a predetermined shape when inflated and deployed.

特に、接合部53は、第１及び第２の縫製部61，62を備えていることにより、縫い針によって孔部61a，62aが形成されているので、いわばミシン目状の脆弱部を構成することとなり、エアバッグ18（図４（ｂ））の膨張展開圧力によって切れが生じることが懸念される。この点、孔部61a，61aの間隔、及び、孔部62a，62aの間隔を大きくするなどの構成も考えられるものの、カバー体20全体の意匠から、部分的に間隔を変えることが好ましくない場合がある。そこで、第１及び第２の縫製部61，62の周辺の接合部53を、一及び他の表皮体51，52を重ねて構成しカバー本体21に貼り付けて擬似的な剛体とし、この接合部53から離間する所定の距離範囲内にテアライン28の側部テアライン部41，41及び下部テアライン部44と表皮部22の弱部54の側部弱部65，65及び下部弱部68とを重ねることで、エアバッグ18（図４（ｂ））の膨張展開圧力に対して側部テアライン部41，41及び下部テアライン部44と、側部弱部65，65及び下部弱部68との近傍の位置を強化し、相対的に弱い弱部54に展開圧力を確実に作用させることができ、設計狙いと異なる位置からの表皮部22の破断を防止できる。 In particular, since the joint portion 53 is provided with the first and second sewing portions 61 and 62, the hole portions 61a and 62a are formed by the sewing needle, so that it constitutes a so-called perforated weak portion. Therefore, there is a concern that the airbag 18 (FIG. 4B) may be broken due to the inflation and deployment pressure. In this respect, although a configuration in which the distance between the hole portions 61a and 61a and the distance between the hole portions 62a and 62a are increased may be considered, it is not preferable to partially change the distance from the design of the entire cover body 20. There is. Therefore, the joint portion 53 around the first and second sewn portions 61 and 62 is constructed by superposing one and the other skin bodies 51 and 52, and is attached to the cover body 21 to form a pseudo rigid body. The side tear line portions 41, 41 and the lower tear line portion 44 of the tear line 28 and the side weak portions 65, 65 and the lower weak portion 68 of the weak portion 54 of the skin portion 22 are overlapped with each other within a predetermined distance range apart from the portion 53. Therefore, in the vicinity of the side tear line portions 41, 41 and the lower tear line portion 44, and the side weak portions 65, 65 and the lower weak portion 68 with respect to the inflation and deployment pressure of the airbag 18 (FIG. 4(b)). The position can be strengthened, the deployment pressure can be reliably applied to the relatively weak portion 54, and the skin portion 22 can be prevented from breaking from a position different from the intended position.

また、テアライン28は、エアバッグ18（図４（ｂ））の膨張展開圧力が、収納状態のエアバッグ18（図４（ｂ））に対向する横連結テアライン部42及び縦連結テアライン部43に初期段階から加わり、続いてこれら横連結テアライン部42及び縦連結テアライン部43と側部テアライン部41，41及び下部テアライン部44との交差部となるため、表皮部22の破断が、側部テアライン部41，41及び下部テアライン部44に重なる位置をオーバーして破断する傾向にある。そこで、本実施の形態では、側部テアライン部41，41と横連結テアライン部42との交差部、及び、下部テアライン部44と縦連結テアライン部43との交差部とのそれぞれと重なる位置にて一の表皮体51に弱部54（側部弱部65，65及び下部弱部68）を設けることで、表皮部22が横連結テアライン部42及び縦連結テアライン部43に対応する位置から側部テアライン部41，41及び下部テアライン部44をオーバーした位置へと破断することなく、側部テアライン部41，41及び下部テアライン部44に重なる側部弱部65，65及び下部弱部68の位置でより確実に表皮部22を破断させることができる。 In addition, the tear line 28 has a horizontal connection tear line portion 42 and a vertical connection tear line portion 43, which are arranged so that the inflation and deployment pressure of the airbag 18 (FIG. 4B) faces the stored airbag 18 (FIG. 4B). Joined from the initial stage, and subsequently, the lateral connection tear line portion 42 and the vertical connection tear line portion 43, and the side tear line portions 41 and 41, and the lower tear line portion 44 are intersected with each other. The parts 41, 41 and the lower tear line part 44 tend to break beyond the position where they overlap. Therefore, in the present embodiment, the side tear line portions 41, 41 and the horizontal connecting tear line portion 42 intersect with each other, and the lower tear line portion 44 and the vertical connecting tear line portion 43 intersect with each other. By providing the weak portion 54 (side weak portions 65 and 65 and the lower weak portion 68) in the one epidermis 51, the epidermis portion 22 is located from the position corresponding to the lateral connection tear line portion 42 and the vertical connection tear line portion 43 to the side portion. At the positions of the side weak portions 65, 65 and the lower weak portion 68 that overlap the side tear line portions 41, 41 and the lower tear line portion 44 without breaking to the positions where the tear line portions 41, 41 and the lower tear line portion 44 are overlaid. The skin portion 22 can be broken more reliably.

すなわち、テアライン28及びこのテアライン28の形状と略同形状となる弱部54が屈曲している場合に、本実施の形態のように、この屈曲している箇所を接合部53の近傍の所定の距離範囲内とすることで、弱部54を安定して開裂させることができる。 That is, when the tear line 28 and the weak portion 54 having substantially the same shape as that of the tear line 28 are bent, as in the present embodiment, the bent portion is provided at a predetermined position near the joint 53. By setting the distance within the range, the weak portion 54 can be stably cleaved.

具体的に、側部弱部65及び下部弱部68に対して０．５ｍｍ〜５．５ｍｍの範囲の位置に接合部53の他の表皮体52の曲げ部、すなわち巻き込み片部58aと意匠側片部58bとの連続部である露出開口部57の縁部を位置させる、または、側部弱部65及び下部弱部68に対して接合部53（第１及び第２の縫製部61，62）を３．０ｍｍ〜１０．５ｍｍの範囲の位置とすることで、弱部54の開裂を確実に安定させることができる。 Specifically, the bent portion of the other skin body 52 of the joint portion 53, that is, the winding piece portion 58a and the design side at a position in the range of 0.5 mm to 5.5 mm with respect to the side weak portion 65 and the lower weak portion 68. The edge portion of the exposed opening 57, which is a continuous portion with the piece portion 58b, is positioned, or the joint portion 53 (the first and second sewn portions 61, 62) is joined to the side weak portion 65 and the lower weak portion 68. ) Is set to a position in the range of 3.0 mm to 10.5 mm, the cleavage of the weak portion 54 can be reliably stabilized.

さらに、エアバッグ18（図４（ｂ））の突出方向に沿って対向部に突設された突出部34を接合部53の外方に沿わせることで、一及び他の表皮体51，52の一部の重ね合わせによる表皮部22の嵩高を突出部34によって吸収し、見栄えを向上できる。さらに、表板部25は、突出部34の位置で他の一般部よりも厚みが大きくなっているので、この突出部34の位置での表板部25の厚みによってエアバッグ18の膨張時の展開圧力に対して強度を確保するとともに接合部53の外方を確実に押さえてエアバッグ18（図４（ｂ））の膨張時の展開圧力をテアライン28及び弱部54に確実に作用させ、テアライン28及び弱部54から表板部25及び表皮部22を確実に破断させることができる。 Further, the protrusions 34 projecting from the opposing portions along the protrusion direction of the airbag 18 (FIG. 4(b)) are provided along the outside of the joint 53, so that one and the other skin bodies 51, 52 are formed. The protrusion 34 absorbs the bulkiness of the skin portion 22 due to the overlapping of a part thereof, and the appearance can be improved. Furthermore, since the thickness of the front plate portion 25 at the position of the protruding portion 34 is larger than that of the other general portions, the thickness of the front plate portion 25 at the position of the protruding portion 34 causes the airbag 18 to be inflated. While securing strength against the deployment pressure and securely pressing the outside of the joint portion 53, the deployment pressure when the airbag 18 (FIG. 4(b)) is inflated is surely applied to the tear line 28 and the weak portion 54, The surface plate portion 25 and the skin portion 22 can be reliably broken from the tear line 28 and the weak portion 54.

この結果、デザイン性が良好で、かつ、設計狙い通りテアライン28及び弱部54が開裂するカバー体20の仕様を安価に提供できる。 As a result, it is possible to provide the specifications of the cover body 20 which has good designability and in which the tear line 28 and the weak portion 54 are to be cleaved as intended, at low cost.

次に、第２の実施の形態を図６及び図７を参照して説明する。なお、上記の第１の実施の形態と同様の構成及び作用については、同一符号を付して説明を省略する。 Next, a second embodiment will be described with reference to FIGS. 6 and 7. The same components and operations as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

この第２の実施の形態は、上記の第１の実施の形態において、カバー本体21の段差部33と突出部34との位置が入れ替わっているものである。すなわち、図７（ａ）に示すように、カバー本体21は、正面板部31のエアバッグ収納部に対向する領域が、エアバッグ18の突出方向である正面側に相対的に突出した突出部71となっており、この突出部71の周縁部がこの突出部71に対して相対的に窪んだ段差部72となっている。すなわち、突出部71は、略円形状に形成され、段差部72は、この突出部71の周囲を囲む環状（円環状）に形成されている。さらに、突出部71には、エンブレム27を取り付けるための穴部35が設けられている。そして、図６（ａ）に示すように、突出部71が他の表皮体52により覆われ、段差部72が主として一の表皮体51により覆われて、接合部53が突出部71の周縁部に沿って位置している。したがって、この接合部53は、段差部72に貼り付けられて、突出部71の周縁部に対向する位置に固定されている。 In the second embodiment, the positions of the stepped portion 33 and the protruding portion 34 of the cover body 21 are exchanged with each other in the first embodiment. That is, as shown in FIG. 7A, in the cover main body 21, a region of the front plate portion 31 facing the airbag storage portion is a protruding portion relatively protruding toward the front side, which is the protruding direction of the airbag 18. 71, and a peripheral portion of the protruding portion 71 is a step portion 72 that is recessed relative to the protruding portion 71. That is, the protruding portion 71 is formed in a substantially circular shape, and the step portion 72 is formed in a ring shape (circular ring shape) surrounding the periphery of the protruding portion 71. Further, the projecting portion 71 is provided with a hole portion 35 for attaching the emblem 27. Then, as shown in FIG. 6A, the protrusion 71 is covered with another skin 52, the step portion 72 is mainly covered with one skin 51, and the joint 53 is a peripheral portion of the protrusion 71. Are located along. Therefore, the joint portion 53 is attached to the step portion 72 and fixed at a position facing the peripheral portion of the protruding portion 71.

さらに、図７（ｂ）に示すように、一の表皮体51は、他の表皮体52の周囲を囲むもので、略円環状に形成されている。すなわち、一の表皮体51は、図７（ａ）に示す表板部25において、正面板部31の周縁部に位置する段差部72及び延出板部32に亘る部分の表面を面状に覆っている。このため、一の表皮体51（図７（ｂ））は、テアライン28、すなわち側部テアライン部41，41、横連結テアライン部42、及び縦連結テアライン部43の外方に位置している。 Further, as shown in FIG. 7(b), one epidermis 51 surrounds the other epidermis 52 and is formed in a substantially annular shape. That is, in the one skin 51, in the surface plate portion 25 shown in FIG. 7A, the surface of the step portion 72 located at the peripheral portion of the front plate portion 31 and the portion extending to the extending plate portion 32 is formed into a planar shape. Covering. Therefore, the one skin 51 (FIG. 7B) is located outside the tear line 28, that is, the side tear line portions 41, 41, the horizontal connecting tear line portion 42, and the vertical connecting tear line portion 43.

また、他の表皮体52は、表板部25の主意匠を構成するもので、略円形状に形成されている。すなわち、他の表皮体52は、表板部25において、正面板部31の略中央部に位置する突出部71の表面を面状に覆っている。このため、他の表皮体52は、図７（ａ）に示すテアライン28、すなわち側部テアライン部41，41、横連結テアライン部42、縦連結テアライン部43及び下部テアライン部44をそれぞれ覆っている。また、図７（ｂ）に示すように、他の表皮体52の中央部には、穴部35と連通しエンブレム27が取り付けられる通孔55が開口されている。 The other skin body 52 constitutes the main design of the surface plate portion 25, and is formed in a substantially circular shape. That is, the other skin body 52 covers the surface of the protruding portion 71 located substantially at the center of the front plate portion 31 in the front plate portion 25 in a planar manner. Therefore, the other skin 52 covers the tear line 28 shown in FIG. 7A, that is, the side tear line portions 41, 41, the lateral connection tear line portion 42, the vertical connection tear line portion 43, and the lower tear line portion 44, respectively. .. Further, as shown in FIG. 7B, a through hole 55, which is in communication with the hole 35 and to which the emblem 27 is attached, is opened at the center of the other skin 52.

さらに、弱部54は、本実施の形態では他の表皮体52の背面側を溝状に凹設した薄肉部であり、他の表皮体52の他の部分より脆弱で破断及び変形可能に形成されている。また、図６（ｂ）に示すように、弱部54の側部弱部65及び下部弱部68は、接合部53（第１及び第２の縫製部61，62）に対して、所定の距離範囲内の近傍に位置している。具体的に、側部弱部65及び下部弱部68は、一の表皮体51の内縁部、すなわち一の重ね部56の先端部に対して、０．５〜５．５ｍｍの距離範囲内とするとともに、接合部53（第１及び第２の縫製部61，62）に対して３．０ｍｍ〜８．０ｍｍの距離範囲内とすることが好ましい。これは、テアライン28（側部テアライン部41及び下部テアライン部44）の幅寸法を考慮すると、３．０ｍｍよりも小さくすることが容易でなく、８．０ｍｍよりも長いと、エアバッグ18の展開時の展開力に対して弱部54の近傍を抑える力が低下するためである。より具体的に、本実施の形態では、弱部54の側部弱部65及び下部弱部68（テアライン28の側部テアライン部41及び下部テアライン部44）と突出部71の縁部との距離Ｄ8が４．０ｍｍに設定され、突出部71の外縁部と一の表皮体51の一の重ね部56の先端部及び他の表皮体52の他の重ね部58の巻き込み片部58aの先端部との距離Ｄ9が１．０ｍｍに設定され、一の表皮体51の一の重ね部56の先端部及び他の表皮体52の他の重ね部58の巻き込み片部58aの先端部と第１の縫製部61との距離Ｄ10が１．０ｍｍに設定され、第１の縫製部61と第２の縫製部62との距離Ｄ11が２．０ｍｍに設定されている。そのため、弱部54の側部弱部65及び下部弱部68（テアライン28の側部テアライン部41及び下部テアライン部44）と第２の縫製部62との距離Ｄ12（＝Ｄ8＋Ｄ9＋Ｄ10＋Ｄ11）が８．０ｍｍに設定されている。また、第２の縫製部62と他の表皮体52の外縁部（巻き込み片部58aと意匠側片部58bとの連続部）との距離Ｄ13が３．０ｍｍに設定されている。 Further, in the present embodiment, the weak portion 54 is a thin-walled portion in which the back surface side of the other skin body 52 is recessed, and is formed so as to be more fragile and breakable and deformable than other portions of the other skin body 52. Has been done. In addition, as shown in FIG. 6B, the side weak portion 65 and the lower weak portion 68 of the weak portion 54 have a predetermined shape with respect to the joint portion 53 (first and second sewing portions 61 and 62). It is located near the distance range. Specifically, the side weak portion 65 and the lower weak portion 68 are within a distance range of 0.5 to 5.5 mm with respect to the inner edge portion of the one epidermis 51, that is, the tip portion of the one overlapping portion 56. In addition, it is preferable that the distance from the joint portion 53 (first and second sewn portions 61 and 62) is within a range of 3.0 mm to 8.0 mm. Considering the width dimensions of the tear line 28 (the side tear line portion 41 and the lower tear line portion 44), it is not easy to make it smaller than 3.0 mm. This is because the force that suppresses the vicinity of the weak portion 54 decreases with respect to the deploying force at that time. More specifically, in the present embodiment, the distance between the side weak portion 65 and the lower weak portion 68 of the weak portion 54 (the side tear line portion 41 and the lower tear line portion 44 of the tear line 28) and the edge portion of the protruding portion 71. D8 is set to 4.0 mm, the outer edge of the protruding portion 71 and the tip of the overlapping portion 56 of the one outer skin 51 and the tip of the winding piece 58a of the other overlapping portion 58 of the other outer skin 52. Is set to 1.0 mm, and the front end of one overlapping portion 56 of one skin 51 and the front end of the winding piece 58a of the other overlapping 58 of another skin 52 and the first The distance D10 to the sewn portion 61 is set to 1.0 mm, and the distance D11 to the first sewn portion 61 and the second sewn portion 62 is set to 2.0 mm. Therefore, the distance D12 (=D8+D9+D10+D11) between the side weak portion 65 and the lower weak portion 68 of the weak portion 54 (the side tear line portion 41 and the lower tear line portion 44 of the tear line 28) and the second sewing portion 62 is 8.0 mm. Is set to. Further, the distance D13 between the second sewn portion 62 and the outer edge portion of the other skin body 52 (the continuous portion of the winding piece portion 58a and the design side piece portion 58b) is set to 3.0 mm.

そして、上記のカバー体20を備えたエアバッグ装置12をステアリングホイール10に備えた自動車が衝突などすると、制御装置により作動されたインフレータからガスが供給されたエアバッグ18が急速に膨張展開し、この膨張展開する圧力が各扉予定部37を押し上げ、テアライン28及び弱部54にエアバッグ18の膨張圧力が作用して、このテアライン28及び弱部54に沿ってカバー本体21の表板部25が、上記の第１の実施の形態と同様に、一及び他の表皮体51，52と一体的に破断し、扉部45を形成する。 Then, when a vehicle provided with the steering wheel 10 the airbag device 12 having the above-mentioned cover body 20 collides, the airbag 18 supplied with gas from the inflator operated by the control device is rapidly inflated and deployed, This inflating and expanding pressure pushes up each planned door portion 37, and the inflation pressure of the airbag 18 acts on the tear line 28 and the weak portion 54, and along the tear line 28 and the weak portion 54, the front plate portion 25 of the cover body 21. However, similarly to the first embodiment, the door portion 45 is formed by integrally breaking with the one and the other skins 51 and 52.

このとき、一及び他の表皮体51，52の一部同士が重ね合わせられて接合され表板部25に固定された接合部53に対して所定の距離範囲内でこの接合部53に沿って、テアライン28の少なくとも一部（側部テアライン部41，41及び下部テアライン部44）と重なる位置で他の表皮体52に弱部54（側部弱部65，65及び下部弱部68）を設けるなど、上記の第１の実施の形態と同様の構成を有することにより、上記の第１の実施の形態と同様の作用効果を奏することができる。すなわち、一の表皮体51と他の表皮体52との位置が入れ替わっても、あるいは、段差部72と突出部71との領域が入れ替わっても、同様の構成を適用することで、同様の作用効果を奏することができる。 At this time, along the joint portion 53 within a predetermined distance range with respect to the joint portion 53 fixed to the front plate portion 25 by joining a part of the one and the other skin body 51, 52 to each other. , A weak portion 54 (side weak portions 65, 65 and lower weak portion 68) is provided in another epidermis 52 at a position overlapping at least a part of the tear line 28 (side tear line portions 41, 41 and lower tear line portion 44). By having the same configuration as that of the above-described first embodiment, the same operational effect as that of the above-described first embodiment can be obtained. That is, even if the positions of the one skin 51 and the other skin 52 are exchanged, or even if the regions of the stepped portion 72 and the protruding portion 71 are exchanged, by applying a similar configuration, the same effect It is possible to exert an effect.

なお、上記の各実施の形態において、表皮部22を構成する表皮体は２つに限らず、３つ以上用いることもできる。 In each of the above-described embodiments, the number of skin bodies that form the skin portion 22 is not limited to two, and three or more may be used.

また、カバー体20は、運転席用のエアバッグ装置だけでなく、例えばインストルメントパネル部に設置されて助手席の乗員の前方にエアバッグを展開する助手席用のエアバッグ装置、あるいは助手席の乗員に対向する縦壁面部と乗員の下肢部との間にエアバッグを展開するニーエアバッグ装置などにも適用できる。 Further, the cover body 20 is not only the airbag device for the driver's seat, but is also an airbag device for the passenger seat, which is installed in the instrument panel portion and deploys the airbag in front of the passenger in the passenger seat, or the passenger seat. It can also be applied to a knee airbag device that deploys an airbag between a vertical wall surface facing the occupant and the lower limb of the occupant.

本発明は、例えば運転席用のエアバッグ装置のカバー体として好適に用いることができる。 INDUSTRIAL APPLICABILITY The present invention can be suitably used, for example, as a cover body of an airbag device for a driver's seat.

12 エアバッグ装置
18 エアバッグ
20 カバー体
21 カバー本体
22 表皮部
25 対向部としての表板部
28 テアライン
31 対向部本体としての正面板部
34 突出部
41 縁部テアライン部としての側部テアライン部
42 連結テアライン部としての横連結テアライン部
43 連結テアライン部としての縦連結テアライン部
44 縁部テアライン部としての下部テアライン部
51 表皮体である一の表皮体
52 表皮体である他の表皮体
53 接合部
54 弱部
65 縁部弱部としての側部弱部
66 連結弱部としての横連結弱部
67 連結弱部としての縦連結弱部
68 縁部弱部としての下部弱部 12 Airbag device
18 airbag
20 cover body
21 cover body
22 Epidermis
25 Front plate part as facing part
28 Tear Line
31 Front plate as main body
34 Projection
41 Side tear line as edge tear line
42 Lateral connection tear line part as connection tear line part
43 Vertically connected tear line part as connected tear line part
44 Lower tear line as edge tear line
51 The epidermis, which is the epidermis
52 Other epidermis that are epidermis
53 joint
54 weak
65 Side weakness as edge weakness
66 Lateral weak connection as weak connection
67 Vertical weak link as weak link
68 Lower Weak Area as Weak Edge

Claims

It has opposing body which faces the air bag housing portion for housing the airbag, facing portion covering the airbag housed in the airbag housing portion, and, provided on the counter body of the facing portion, the air A cover body with a tear line that splits when the bag is inflated and deployed,
And a skin portion covering the facing portion of the cover body,
The tear line is
An edge tear line portion located along the edge of the facing portion main body,
At a position on the center side of the facing portion main body with respect to the edge tear line portion, provided in a direction intersecting the edge tear line portion, and having a connecting tear line portion connected to the edge tear line portion,
The skin portion is
Multiple epidermis,
A part of these skins are overlapped and bonded to each other, and a bonding part fixed to the facing part body ,
Along this joint within a predetermined distance range with respect to this joint, and comprising a weak portion provided on any one of the skins at a position overlapping at least a part of the tear line ,
The weak part is
A weak edge portion that overlaps the edge tear line portion,
A weak connection portion that overlaps the connection tear line portion,
A connecting portion between the weak edge portion and the weak connecting portion is provided at a position closer to the center of the skin portion than the joint portion, and overlaps with an intersecting portion of the edge tear line portion and the connecting tear line portion. A cover body for an airbag device, which is characterized by being provided .

Cover body, protruding from the opposing body along the protruding direction of the airbag, the cover member of an airbag device according to claim 1, characterized in that it comprises a protruding portion along the outside of the joint.