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JP2005104269A - Air bag device for knee protection - Google Patents

Air bag device for knee protection Download PDF

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Publication number
JP2005104269A
JP2005104269A JP2003339502A JP2003339502A JP2005104269A JP 2005104269 A JP2005104269 A JP 2005104269A JP 2003339502 A JP2003339502 A JP 2003339502A JP 2003339502 A JP2003339502 A JP 2003339502A JP 2005104269 A JP2005104269 A JP 2005104269A
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Japan
Prior art keywords
airbag
case
air bag
cover
knee
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JP2003339502A
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Japanese (ja)
Inventor
Naoki Hotta
直紀 堀田
Shoichi Hashimoto
正一 橋本
Atsushi Nagata
篤 永田
Yoshio Mizuno
喜夫 水野
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Toyoda Gosei Co Ltd
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Toyoda Gosei Co Ltd
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Priority to JP2003339502A priority Critical patent/JP2005104269A/en
Priority to DE102004047332A priority patent/DE102004047332B4/en
Publication of JP2005104269A publication Critical patent/JP2005104269A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/205Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in dashboards
    • B60R21/206Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in dashboards in the lower part of dashboards, e.g. for protecting the knees
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R21/2165Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/231Inflatable members characterised by their shape, construction or spatial configuration
    • B60R2021/23169Inflatable members characterised by their shape, construction or spatial configuration specially adapted for knee protection
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/231Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/2334Expansion control features
    • B60R21/2338Tethers
    • B60R2021/23382Internal tether means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/237Inflatable members characterised by the way they are folded

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag device for knee protection capable of developing and inflating an air bag by restraining popping quantity to the rear side at an initial inflating stage. <P>SOLUTION: This air bag device S for knee protection is furnished with an air bag 51 inflating to protect a knee, an inflator 46 to discharge gas for inflation, a case 19 to store the air bag and the inflator and an air bag cover 29 to cover the air bag free to project. The case 19 has an opening 19a on the rear end side and is furnished with an upper wall part 21, left and right side wall parts 22, 23, a lower wall part 24 and a bottom wall part 25. The cover 29 is furnished with a door part pushed by the air bag at the time of inflation and to open downward. Arranging positions of a hinge part 35 of the door part 34 and a rear end 24a of the lower wall part of the case are arranged on the front side along a standard line X from the neighborhood of a central portion C of the air bag stored in the case with a straight line extending to the rear side along the upper wall part from the bottom wall part side of the case as the standard line X. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、車両に搭載されて、着座した乗員の膝を保護可能な膝保護用エアバッグ装置に関する。   The present invention relates to a knee protection airbag device that is mounted on a vehicle and can protect a knee of a seated occupant.

従来、膝保護用エアバッグ装置は、着座した乗員の膝の前方側に配設されており、そして、膝を保護可能に膨張するエアバッグと、エアバッグ内に配設されてエアバッグを膨張させるための膨張用ガスを吐出するインフレーターと、折り畳まれたエアバッグをインフレーターとともに収納するケースと、折り畳まれたエアバッグを突出可能に覆うエアバッグカバーと、を備えて構成されていた(例えば、特許文献1参照)。   Conventionally, a knee protection airbag device is disposed on the front side of a knee of a seated occupant, and an airbag that inflates the knee so as to protect the knee, and the airbag is disposed in the airbag to inflate the airbag. An inflator that discharges an inflating gas, a case that houses a folded airbag together with the inflator, and an airbag cover that covers the folded airbag in a projectable manner (for example, Patent Document 1).

そしてさらに、ケースは、エアバッグを後方側へ突出可能な開口を後端側に備える箱形状として、上壁部、左右の側壁部、下壁部、及び、前端側に配置される底壁部、を備えて構成されていた。また、エアバッグカバーは、膨張時のエアバッグに押されて、上縁側を下方に回転させるように、下開きで開く扉部を備えて、構成されていた。
国際公開第02/04262号パンフレット(図74・75)
In addition, the case has a box shape provided with an opening on the rear end side that allows the airbag to protrude rearward. The upper wall portion, the left and right side wall portions, the lower wall portion, and the bottom wall portion disposed on the front end side. , Was configured with. In addition, the airbag cover is configured to include a door portion that opens by being opened downward so that the airbag is pushed by the airbag when inflated to rotate the upper edge side downward.
International Publication No. 02/04262 Pamphlet (Figures 74 and 75)

しかし、従来の膝保護用エアバッグ装置では、乗員が通常位置より前方に位置しているような場合、エアバッグが、膨張初期時に、乗員側、すなわち、車両後方側へ、大きく飛び出しては、乗員の脛と干渉する虞れが生ずることから、エアバッグの車両後方側への飛び出し量を抑える点に、改善の余地があった。   However, in the conventional knee protection airbag device, when the occupant is located in front of the normal position, the airbag largely protrudes toward the occupant side, that is, the vehicle rear side at the initial stage of inflation. There is a possibility of interference with the shin of the occupant, so there is room for improvement in terms of suppressing the amount of the airbag protruding to the rear side of the vehicle.

本発明は、上述の課題を解決するものであり、膨張初期時の後方側への飛び出し量を抑えて、エアバッグを展開膨張させることができる膝保護用エアバッグ装置を提供することを目的とする。   An object of the present invention is to solve the above-described problems, and to provide a knee protection airbag device capable of deploying and inflating an airbag while suppressing the amount of protrusion to the rear side at the initial stage of inflation. To do.

本発明に係る膝保護用エアバッグ装置は、着座した乗員の膝の前方側に配設されて、
膝を保護可能に膨張するエアバッグと、エアバッグ内に配設されてエアバッグを膨張させるための膨張用ガスを吐出するインフレーターと、折り畳まれたエアバッグをインフレーターとともに収納するケースと、折り畳まれたエアバッグを突出可能に覆うエアバッグカバーと、を備えて構成され、
ケースが、エアバッグを後方側へ突出可能な開口を後端側に有して、上壁部、左右の側壁部、下壁部、及び、前端側に配置される底壁部、を備えて構成され、
エアバッグカバーが、膨張時のエアバッグに押されて、上縁側を下方に回転させるように、下開きで開く扉部を備えて構成される膝保護用エアバッグ装置であって、
ケースの底壁部側から上壁部に沿って後方側へ延びる直線を基準線として、下開きで開く扉部のヒンジ部とケースの下壁部の後端との配置位置が、共に、折り畳まれてケース内に収納されたエアバッグの中心部位付近より、基準線に沿う前方側に、配置されて、
車両に搭載されていることを特徴とする。
The knee protection airbag device according to the present invention is disposed on the front side of a seated occupant's knee,
An airbag that inflates the knee in a protective manner, an inflator that is disposed in the airbag and discharges an inflating gas for inflating the airbag, a case for storing the folded airbag together with the inflator, and a folded An airbag cover that covers the airbag in a projectable manner,
The case has an opening on the rear end side that allows the airbag to protrude rearward, and includes an upper wall portion, left and right side wall portions, a lower wall portion, and a bottom wall portion disposed on the front end side. Configured,
A knee protection airbag device configured to include a door portion that opens downward so that the airbag cover is pushed by the airbag when inflated and rotates the upper edge side downward,
Using the straight line extending from the bottom wall side of the case to the rear side along the upper wall as a reference line, the arrangement position of the hinge part of the door part that opens by lowering and the rear end of the lower wall part of the case are both folded. From the vicinity of the central part of the airbag stored in the case, on the front side along the reference line,
It is mounted on a vehicle.

本発明に係る膝保護用エアバッグ装置では、インフレーターが作動して膨張用ガスを吐出させると、エアバッグが、膨張し、エアバッグカバーの扉部を押し開かせて、ケースの開口から車両の後方側へ突出する。その際、本発明の膝保護用エアバッグ装置では、下開きで開く扉部が開く際、そのヒンジ部とケースの下壁部の後端との配置位置が、共に、ケースの底壁部側から上壁部に沿って後方側へ延びる基準線に沿って、ケース内に折り畳まれて収納されたエアバッグの中心部位付近より、前方側に、配置されている。   In the knee protection airbag device according to the present invention, when the inflator is activated to discharge the inflation gas, the airbag is inflated to push open the door portion of the airbag cover, and from the opening of the case to the vehicle. Projects backward. At that time, in the knee protection airbag device of the present invention, when the door portion opened by opening downward is opened, the arrangement position of the hinge portion and the rear end of the lower wall portion of the case is both the bottom wall portion side of the case. From the vicinity of the central portion of the airbag that is folded and stored in the case along the reference line that extends rearward along the upper wall portion from the front side, the front side is disposed.

そのため、折り畳まれたエアバッグが、折りを解きつつ、ケースの開口から車両後方側へ突出する際、下方側に、扉部やケースの下壁部が配置されていないことから、エアバッグは、膨張初期時に、下方側への飛び出し量が多くなって、車両後方側への飛び出し量が抑えられ、そして、膝を保護可能に膨張を完了させることとなる。   Therefore, when the folded airbag is unfolded and protrudes from the opening of the case to the vehicle rear side, the door and the lower wall portion of the case are not arranged on the lower side. At the initial stage of expansion, the amount of protrusion to the lower side increases, the amount of protrusion to the rear side of the vehicle is suppressed, and the expansion is completed to protect the knee.

したがって、本発明に係る膝保護用エアバッグ装置では、膨張初期時に、後方側への飛び出し量を抑えて、エアバッグを展開膨張させることができ、前方側に位置する乗員の脛への押圧力を低減できる。また、ケースの下壁部を、従来品より前方側に縮めるように短くできることから、エアバッグ装置を軽量にすることも可能となる。   Therefore, in the knee protection airbag device according to the present invention, at the initial stage of inflation, the airbag can be deployed and inflated while suppressing the amount of protrusion to the rear side, and the pressing force applied to the shin of the occupant located on the front side Can be reduced. Moreover, since the lower wall part of the case can be shortened so as to be contracted to the front side of the conventional product, the airbag device can be made lighter.

なお、下開きで開く扉部のヒンジ部とケースの下壁部の後端との配置位置が、共に、ケースの底壁部側から上壁部に沿って後方側へ延びる基準線に沿って、ケース内に折り畳まれて収納されたエアバッグの中心部位付近より、後方側に配置されていれば、ケースの上壁部と、ケースの下壁部若しくは下開きの扉部のヒンジ部付近と、によって、ケースの開口から飛び出すエアバッグが、上下でガイドされて後方側へ飛び出すような態様となり、下方への飛び出し量が少なくなって、エアバッグの展開膨張初期時の車両後方側への飛び出し量を、低減させ難い。   In addition, the arrangement position of the hinge part of the door part opened by the downward opening and the rear end of the lower wall part of the case is along the reference line extending from the bottom wall part side of the case to the rear side along the upper wall part. The upper wall portion of the case and the hinge portion of the lower wall portion of the case or the door portion of the lower opening, as long as it is arranged on the rear side from the vicinity of the central portion of the airbag folded and stored in the case As a result, the airbag that jumps out from the opening of the case is guided in the vertical direction and jumps out to the rear side, and the amount of popping out is reduced, so that the airbag jumps out to the rear side of the vehicle at the initial stage of inflation and inflation. It is difficult to reduce the amount.

以下、本発明の一実施形態を図面に基づいて説明すると、実施形態の膝保護用エアバッグ装置Sは、図1〜4に示すように、乗員としての運転者Mの膝Kを保護できるように、運転者Mの前方側における膝Kの斜め下の前方側の位置に配置されるとともに、ステアリングコラム3の下方に配設されている。   DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, the knee protection airbag apparatus S of the embodiment can protect a knee K of a driver M as an occupant. In addition, it is disposed at a position on the front side obliquely below the knee K on the front side of the driver M, and below the steering column 3.

なお、本明細書における上下、左右、及び、前後は、膝保護用エアバッグ装置Sを車両に搭載させた際の車両の上下・左右・前後に対応するものである。   In addition, the upper and lower sides, right and left, and front and rear in this specification correspond to the upper and lower, left and right, and front and rear of the vehicle when the knee protection airbag device S is mounted on the vehicle.

ステアリングコラム3は、図1・2に示すように、ステアリングホイール2に連結されるメインシャフト4と、メインシャフト4の周囲を覆うコラムチューブ5と、これらのメインシャフト4とコラムチューブ5とを覆うコラムカバー6と、を備えて構成されている。コラムカバー6は、略四角筒形状等の合成樹脂製として、メインシャフト4の軸方向に沿って配設されている。即ち、コラムカバー6は、車両前方側を下方に配置させて、車両後方側を上方に配置させるように、後上がりに傾斜して配設されている。そして、コラムカバー6におけるインストルメントパネル(以下、インパネとする)8から突出する部位の下面6aは、略長方形形状とし、車両前後方向で、後上がりの曲面状に形成されている。   As shown in FIGS. 1 and 2, the steering column 3 covers a main shaft 4 connected to the steering wheel 2, a column tube 5 covering the periphery of the main shaft 4, and the main shaft 4 and the column tube 5. And a column cover 6. The column cover 6 is made of a synthetic resin having a substantially rectangular tube shape or the like, and is disposed along the axial direction of the main shaft 4. In other words, the column cover 6 is disposed so as to incline rearward so that the front side of the vehicle is disposed downward and the rear side of the vehicle is disposed upward. And the lower surface 6a of the site | part which protrudes from the instrument panel (henceforth an instrument panel) 8 in the column cover 6 is made into a substantially rectangular shape, and is formed in the vehicle back-and-forth direction curved surface shape.

膝保護用エアバッグ装置Sは、図1・3・4・6に示すように、折り畳まれたエアバッグ51、エアバッグ51に膨張用ガスを供給するインフレーター46、折り畳まれたエアバッグ51を覆うエアバッグカバー29、折り畳まれたエアバッグ51とインフレーター46とを収納するケース19、及び、ニーパネル13、を備えて構成されている。そして、実施形態のエアバッグ装置Sでは、ケース19とニーパネル13とが、相互に固着された取付ベース部材11を形成し、エアバッグ51、インフレーター46、及び、エアバッグカバー29が、この取付ベース部材11に組み付けられて、エアバッグ組付体SAが形成され、エアバッグ組付体SAとした状態で、車両に搭載されている。   The knee protection airbag device S covers the folded airbag 51, the inflator 46 that supplies inflation gas to the airbag 51, and the folded airbag 51, as shown in FIGS. 1, 3, 4, and 6. The airbag cover 29, the case 19 for storing the folded airbag 51 and the inflator 46, and the knee panel 13 are configured. In the airbag apparatus S of the embodiment, the case 19 and the knee panel 13 form the attachment base member 11 that is fixed to each other, and the airbag 51, the inflator 46, and the airbag cover 29 are provided with the attachment base. The air bag assembly SA is assembled to the member 11 and is mounted on the vehicle in the state of the air bag assembly SA.

取付ベース部材11は、板金製として、図3・4・6に示すように、平板状のニーパネル13と箱形状のケース19とを一体化させて形成されている。ニーパネル13は、外周縁の複数箇所に、車両のボディ1側に固定するための取付孔14aを有した取付ブラケット部14を配設させている(図2参照)。各取付孔14aには、ボディ1側のインパネリインフォースメント等から延びるブラケット1aに固着されたナットに螺合するボルト10が挿入されることとなる。   As shown in FIGS. 3, 4, and 6, the mounting base member 11 is made of sheet metal, and is formed by integrating a flat knee panel 13 and a box-shaped case 19. The knee panel 13 is provided with mounting bracket portions 14 having mounting holes 14a for fixing to the body 1 side of the vehicle at a plurality of locations on the outer peripheral edge (see FIG. 2). Bolts 10 that are screwed into nuts fixed to a bracket 1a extending from an instrument panel reinforcement or the like on the body 1 side are inserted into each mounting hole 14a.

ケース19は、エアバッグ51を後方側へ突出可能な開口19aを後端側に有する箱形状として、前端側に配置される底壁部25と、上壁部21、左右の側壁部22・23、及び、下壁部24からなる周壁部20と、を備えて構成されている。右側壁部23には、インフレーター46の一端を突出させるための貫通孔23aが開口している。底壁部25には、インフレーター46をケース19に取り付けるための貫通孔25aが2箇所に配設されている。各貫通孔25aには、インフレーター46のボルト46dが挿通される。   The case 19 has a box shape having an opening 19a that can project the airbag 51 rearward on the rear end side, a bottom wall portion 25 disposed on the front end side, an upper wall portion 21, and left and right side wall portions 22 and 23. , And a peripheral wall portion 20 composed of the lower wall portion 24. A through hole 23 a for projecting one end of the inflator 46 is opened in the right wall portion 23. The bottom wall portion 25 is provided with two through holes 25 a for attaching the inflator 46 to the case 19. The bolt 46d of the inflator 46 is inserted into each through hole 25a.

さらに、周壁部20の上壁部21には、複数のフック17が形成されている。これらのフック17は、上壁部21から離れた先端17a側を斜め上の前方向側に向けるように、形成されている。これらのフック17は、エアバッグカバー29を、強い力が作用するエアバッグ51の展開膨張時にも、強固にケース19に保持するために配設されるものである。なお、フック17は、ケース19における上壁部21の上面に配置されているものの、ニーパネル13を形成する部材11a側に、形成されている。   Further, a plurality of hooks 17 are formed on the upper wall portion 21 of the peripheral wall portion 20. These hooks 17 are formed so that the tip 17a side away from the upper wall portion 21 is directed obliquely forward. These hooks 17 are arranged to hold the airbag cover 29 firmly in the case 19 even when the airbag 51 is deployed and inflated by a strong force. Although the hook 17 is disposed on the upper surface of the upper wall portion 21 in the case 19, it is formed on the member 11 a side that forms the knee panel 13.

そして、実施形態の場合、上下で対向する上壁部21と下壁部24とは、開口19aの面を斜め下の後方側に向けるように、下壁部24の後端24aが、上壁部21の後端21aより、車両前方側に位置している。さらに、ケース19の底壁部25側から上壁部21に沿って後方側へ延びる直線を基準線Xとして、下壁部24の後端24aは、折り畳んで収納したエアバッグ49の収納中心C付近より、基準線Xに沿う前方側に、配置されている。   In the case of the embodiment, the upper wall portion 21 and the lower wall portion 24 that are vertically opposed to each other are such that the rear end 24a of the lower wall portion 24 faces the upper wall so that the surface of the opening 19a faces obliquely downward and rearward. It is located on the vehicle front side from the rear end 21a of the portion 21. Furthermore, the rear end 24a of the lower wall portion 24 is stored in a folded storage center C of the airbag 49 with a straight line extending rearward from the bottom wall portion 25 side of the case 19 along the upper wall portion 21 as a reference line X. It is arranged on the front side along the reference line X from the vicinity.

なお、このエアバッグ51の収納中心Cは、ケース19内に、折り畳まれたエアバッグ51が、詰まった状態で収納されることから、ケース19内におけるインフレーター51の後方側からエアバッグカバー29の扉部32・34までの容積の中心、換言すれば、折り畳まれたエアバッグ51におけるインフレーター51より後方側の部位の重心位置、と略一致することとなる。   The storage center C of the airbag 51 is stored in a state in which the folded airbag 51 is stored in the case 19, so that the airbag cover 29 can be opened from the rear side of the inflator 51 in the case 19. The center of the volume to the door parts 32 and 34, that is, the position of the center of gravity of the part of the folded airbag 51 on the rear side of the inflator 51 substantially coincides.

また、取付ベース部材11は、ニーパネル13を形成するパネル部11aとケース19を形成するケース部11dとの2つの板金部材から形成されて、パネル部11aのケース19を配設させるための上方へ凹むような開口11bの内周縁には、ケース19における上壁部21や側壁部22・23の外周面側に溶接させるための溶接部位11cとフック17を形成するための部位とが、配設されている。さらに、ケース部11dは、1枚の板金を折曲させて所定部位を溶接することにより、ケース19の箱形状を形成している。また、ニーパネル13には、図5・6に示すように、エアバッグカバー29のパネルカバー部42を係止するための略正方形形状に開口する係止孔15が、左右の2箇所に形成されるとともに、ケース19の上縁側に、前後方向に貫通し、左右方向に延びて長方形形状に開口した4個の貫通孔16が、形成されている。   Further, the mounting base member 11 is formed of two sheet metal members, that is, a panel portion 11a that forms the knee panel 13 and a case portion 11d that forms the case 19, and moves upward to dispose the case 19 of the panel portion 11a. A welded portion 11c for welding to the outer peripheral surface side of the upper wall portion 21 and the side wall portions 22 and 23 in the case 19 and a portion for forming the hook 17 are disposed on the inner peripheral edge of the opening 11b that is recessed. Has been. Furthermore, the case part 11d forms the box shape of the case 19 by bending one sheet metal and welding a predetermined part. Further, as shown in FIGS. 5 and 6, the knee panel 13 has locking holes 15 that are opened in a substantially square shape for locking the panel cover portion 42 of the airbag cover 29 at two locations on the left and right. In addition, four through-holes 16 that penetrate in the front-rear direction and extend in the left-right direction and open in a rectangular shape are formed on the upper edge side of the case 19.

エアバッグカバー29は、ポリオレフィン系等の熱可塑性エラストマーから形成されて、図2〜6に示すように、ケース19の開口19aを覆うカバー本体部30と、ニーパネル13の車両後方側を覆うパネルカバー部42と、を備えて構成されている。カバー本体部30には、下縁32a側を上方に回転させるように上開きで開く上扉部32と、上縁34a側を下方に回転させるように下開きで開く下扉部34と、の二枚が配設されている。扉部32・34の周囲には、エアバッグ51に押されて容易に破断する薄肉の破断予定部31が、車両後方側から見て略H字形状に、配設されている。上扉部32の上縁と下扉部34の下縁側とには、破断予定部31が破断して各扉部32・34が開く際のヒンジ部33・35としている。実施形態の場合、ヒンジ部33は、上開き扉部32が容易に開くように、破断しない程度の薄肉とし、ヒンジ部35は、破断しない強度を確保して、係止孔38aが並設されている部位としている。このヒンジ部35の配置位置は、ケース19の下壁部24の後端24a付近として、折り畳んで収納したエアバッグ49の収納中心C付近より、基準線Xに沿う前方側に、配置されている。   The airbag cover 29 is formed of a thermoplastic elastomer such as polyolefin, and as shown in FIGS. 2 to 6, as shown in FIGS. 2 to 6, a cover main body 30 that covers the opening 19 a of the case 19 and a panel cover that covers the rear side of the knee panel 13. Part 42. The cover main body 30 includes an upper door portion 32 that opens by opening up so as to rotate the lower edge 32a upward, and a lower door portion 34 that opens by opening downward so as to rotate the upper edge 34a side downward. Two pieces are arranged. Around the door portions 32 and 34, a thin-walled portion to be broken 31 that is easily broken when pushed by the airbag 51 is disposed in a substantially H shape when viewed from the vehicle rear side. On the upper edge of the upper door portion 32 and the lower edge side of the lower door portion 34, hinge portions 33 and 35 are formed when the planned break portion 31 is broken and the door portions 32 and 34 are opened. In the case of the embodiment, the hinge portion 33 is thin enough not to break so that the upper opening door portion 32 can be easily opened, and the hinge portion 35 has a strength not to break, and the locking hole 38a is provided in parallel. It is a part that is. The arrangement position of the hinge portion 35 is arranged near the rear end 24a of the lower wall portion 24 of the case 19 and on the front side along the reference line X from the vicinity of the storage center C of the airbag 49 that is folded and stored. .

なお、破断予定部31における「H」字の左右の下端31aは、カバー本体部30の下縁30b側の端面まで、延びている。   Note that the left and right lower ends 31 a of the “H” shape in the planned fracture portion 31 extend to the end surface on the lower edge 30 b side of the cover main body portion 30.

パネルカバー部42には、ニーパネル13の各係止孔15の周縁に係止される係止脚43が形成されるとともに、各係止脚43の近傍には、係止孔15の内周面に当接させて、係止脚43の挿入を案内する案内ロッド44が配設されている(図5・6参照)。   The panel cover portion 42 is formed with a locking leg 43 that is locked to the periphery of each locking hole 15 of the knee panel 13, and an inner peripheral surface of the locking hole 15 near each locking leg 43. A guide rod 44 that guides the insertion of the locking leg 43 is provided (see FIGS. 5 and 6).

また、エアバッグカバー29におけるカバー本体部30の上縁30a側には、図3・6に示すように、ニーパネル13の各貫通孔16に挿入されて、各フック17に係止させる4つの取付片37が、車両前方側に延びるように配設されている。各取付片37は、略長方形の板状とし、それぞれ、上下方向に貫通して、略長方形に開口する係止孔37aを備えている。   Further, on the upper edge 30a side of the cover body portion 30 of the airbag cover 29, as shown in FIGS. 3 and 6, there are four attachments that are inserted into the through holes 16 of the knee panel 13 and locked to the hooks 17, respectively. The piece 37 is arrange | positioned so that it may extend in the vehicle front side. Each attachment piece 37 has a substantially rectangular plate shape, and includes a locking hole 37a penetrating in the vertical direction and opening in a substantially rectangular shape.

また、エアバッグカバー29におけるカバー本体部30の下縁30b側には、車両前方側に延びる1つの取付片38が形成されている。この取付片38は、ケース19の左右方向の幅寸法より僅かに大きくしている。そして、この取付片38には、取付ブラケット27の各係止爪部27bに係止可能に、それぞれ、上下方向に貫通して、略長方形に開口する係止孔38aが形成されている。   Further, one attachment piece 38 extending toward the vehicle front side is formed on the lower edge 30b side of the cover main body 30 in the airbag cover 29. The attachment piece 38 is slightly larger than the width dimension of the case 19 in the left-right direction. The mounting piece 38 is formed with a locking hole 38a penetrating in the vertical direction and opening in a substantially rectangular shape so as to be locked to each locking claw portion 27b of the mounting bracket 27.

なお、取付片38は、各係止孔38aより後方側の部位、すなわち、ヒンジ部35より後方側の部位を、下扉部34の下部側におけるカバー本体部30の下縁30bより前方側の部位34bと、共用させている。   The attachment piece 38 has a portion on the rear side from each locking hole 38 a, that is, a portion on the rear side from the hinge portion 35, on the front side of the lower edge 30 b of the cover main body portion 30 on the lower side of the lower door portion 34. It is made to share with the site | part 34b.

また、エアバッグカバー29は、アッパパネル8aとロアパネル8bとからなるインパネ8のロアパネル8bの下方側に配置されることとなる(図1・2参照)。   Moreover, the airbag cover 29 will be arrange | positioned below the lower panel 8b of the instrument panel 8 which consists of the upper panel 8a and the lower panel 8b (refer FIG. 1, 2).

インフレーター46は、図3・4に示すように、電気信号を入力させて膨張用ガスを吐出可能に構成されたシリンダタイプとして構成され、ガス吐出口46aを備えた円柱状の本体部46aと、本体部46aを保持する略円筒状とした板金製の取付ブラケット46cと、を備え、取付ブラケット46cには、インフレーター46をケース19に取り付けるための2本のボルト46dが突設されている。このインフレーター46は、取付ブラケット46cを、本体部46aに外装させて、縮径させるように塑性変形させることにより、本体部46aに取付ブラケット46cを結合させて、構成されている。そして、インフレーター46は、2本のボルト46dをケース19の貫通孔25aに挿通させて、各ボルト46dにナット47を締め付けることにより、ケース19に取り付けられている。なお、ケース19内への収納時には、インフレーター46は、本体部46aの一端とボルト46dとを突出させて、エアバッグ51に包まれた状態で、収納され、そして、ナット47を締め付ける際には、取付ブラケット27も共締めすることとなる。   As shown in FIGS. 3 and 4, the inflator 46 is configured as a cylinder type configured to be able to discharge an expansion gas by inputting an electric signal, and a cylindrical main body portion 46a having a gas discharge port 46a; And a mounting bracket 46c made of a sheet metal that holds the main body 46a. The mounting bracket 46c is provided with two bolts 46d for attaching the inflator 46 to the case 19. The inflator 46 is configured by attaching the mounting bracket 46c to the main body 46a by plastically deforming the mounting bracket 46c on the main body 46a so as to reduce the diameter. The inflator 46 is attached to the case 19 by inserting two bolts 46d through the through holes 25a of the case 19 and tightening nuts 47 on the respective bolts 46d. When the inflator 46 is stored in the case 19, the inflator 46 is stored in a state where one end of the main body 46 a and the bolt 46 d are projected and wrapped in the airbag 51, and when the nut 47 is tightened. The mounting bracket 27 is also tightened together.

また、このインフレーター46は、ステアリングホイール2に搭載された図示しないエアバッグ装置を作動させる制御装置からの電気信号を、ステアリングホイール用エアバッグ装置と同時に入力させて、作動される。   The inflator 46 is operated by inputting an electric signal from a control device for operating an airbag device (not shown) mounted on the steering wheel 2 simultaneously with the steering wheel airbag device.

取付片38を係止する取付ブラケット27は、図3・4・6に示すように、各係止孔38aに下方側から挿入される係止爪部27bを、後端側に四個形成して構成されており、各係止爪部27bは、上方へ延びて、先端27cを車両側前方に屈曲させて延ばしている。また、ブラケット27は、前部側を上方向に延ばしており、その部位には、インフレーター46のボルト46dを貫通させる取付孔27aが、二箇所に形成されている。   As shown in FIGS. 3, 4, and 6, the mounting bracket 27 that locks the mounting piece 38 has four locking claw portions 27 b that are inserted into the respective locking holes 38 a from the lower side on the rear end side. Each latching claw portion 27b extends upward and bends and extends a tip 27c forward in the vehicle side. In addition, the bracket 27 extends on the front side in the upward direction, and attachment holes 27a through which the bolts 46d of the inflator 46 pass are formed at two locations.

エアバッグ51は、図7・8に示すように、可撓性を有したポリエステルやポリアミド等の織布から形成されて、展開膨張完了時の形状を略長方形板状として、構成されている。そして、エアバッグ51は、展開膨張完了時に、乗員(運転者)M側に乗員側壁部52を配置させ、コラムカバー6側に車体側壁部53を配置させるように、構成されている。壁部52・53は、相互に略同形状に形成されている。なお、実施形態のエアバッグ51は、壁部52・53相互が下縁51b側で連なった一枚の織布を、下縁51bで二つ折りし、外周縁を縫合して、形成されている。また、エアバッグ51の下縁51b側における車体側壁部53の下部には、二つの取付孔54と一つの貫通孔55とが形成されている(図9参照)。取付孔54・54は、インフレーター46の各ボルト46dを挿通させるものであり、貫通孔55は、インフレーター46の本体部46aを挿通させるものである。そして、エアバッグ51は、貫通孔55からインフレーター46の本体部46aを突出させて、各取付孔54の周縁を、取付ブラケット46cとケース19の底壁部25とに挟持させて、ケース19に取り付けられている。すなわち、このエアバッグ51は、取付孔54の周縁を取付部位として、ケース19の底壁部25に対して、取付固定されている。   As shown in FIGS. 7 and 8, the airbag 51 is formed from a woven fabric such as flexible polyester or polyamide, and has a substantially rectangular plate shape at the time of completion of deployment. And the airbag 51 is comprised so that the passenger | crew side wall part 52 may be arrange | positioned at the passenger | crew (driver | operator) M side, and the vehicle body side wall part 53 may be arrange | positioned at the column cover 6 side at the time of completion of expansion | deployment. The walls 52 and 53 are formed in substantially the same shape. Note that the airbag 51 of the embodiment is formed by folding a single woven fabric in which the walls 52 and 53 are connected to each other on the lower edge 51b side, and folding the outer edge together with the lower edge 51b. . Further, two attachment holes 54 and one through hole 55 are formed in the lower portion of the vehicle body side wall 53 on the lower edge 51b side of the airbag 51 (see FIG. 9). The attachment holes 54 and 54 are for inserting the bolts 46d of the inflator 46, and the through hole 55 is for inserting the main body 46a of the inflator 46. The airbag 51 projects from the through-hole 55 the main body 46a of the inflator 46, and the peripheral edge of each mounting hole 54 is sandwiched between the mounting bracket 46c and the bottom wall 25 of the case 19 so that the case 19 It is attached. That is, the airbag 51 is attached and fixed to the bottom wall portion 25 of the case 19 with the peripheral edge of the attachment hole 54 as an attachment site.

また、エアバッグ51内には、左右方向に沿って配設されるテザー56・57が、上下二段に配設されている。各テザー56・57は、壁部52・53を連結して、膨張完了時のエアバッグ51を板形状に維持できるように、配設されている。なお、各テザー56・57は、それぞれ、二枚ずつの布材56a・57aから形成されている。   In the airbag 51, tethers 56 and 57 arranged along the left-right direction are arranged in two upper and lower stages. The tethers 56 and 57 are arranged so as to connect the wall portions 52 and 53 so that the airbag 51 at the completion of the inflation can be maintained in a plate shape. Each of the tethers 56 and 57 is formed of two cloth materials 56a and 57a.

このエアバッグ装置Sの車両への搭載について説明すると、まず、ボルト46dを取付孔54から突出させ、かつ、本体部46aの一部を貫通孔55から突出させて、インフレーター46を収納した状態で、エアバッグ51を折り畳む。エアバッグ51の折り畳みは、実施形態の場合、ケース19の左右方向の幅寸法に対応するように、前後方向の折目を付けて折り畳む縦折りと、左右方向の折目を付けて折り畳む横折りと、の二種類の折り畳み方で折り畳んでおり、特に、横折り行程では、エアバッグ51の上縁51a側を膨張完了時の車両前方側となる車体側壁部53の側で巻き付けるロール折りによって、折り畳んでいる。   The mounting of the airbag apparatus S on a vehicle will be described. First, the bolt 46d is protruded from the mounting hole 54, and a part of the main body 46a is protruded from the through hole 55 so that the inflator 46 is stored. The airbag 51 is folded. In the case of the embodiment, the airbag 51 is folded so that it corresponds to the width dimension in the left-right direction of the case 19 and is folded vertically and folded horizontally and folded horizontally. In the lateral folding process, in particular, by the roll folding that winds the upper edge 51a side of the airbag 51 on the side of the vehicle body side wall 53 that is the front side of the vehicle when the inflation is completed, Folded.

そして、実施形態の場合、図9のAに示すように、車体側壁部53と乗員側壁部52とを重ねて平らにした状態として、ついで、図9のA・Bに示すように、左右方向の幅寸法をケース19に収納可能なように、左右の縁51c・51dを車体側壁部53側に折る。ついで、図9のC・Dに示すように、エアバッグ51の上縁51a側を、車体側壁部53の側で巻いて、下縁51b側に接近させるロール折り行程を行なえば、エアバッグ51の折り畳み行程を完了させることができる。   In the case of the embodiment, as shown in FIG. 9A, the vehicle body side wall 53 and the occupant side wall 52 are overlapped and flattened, and then, as shown in FIGS. The left and right edges 51c and 51d are folded toward the vehicle body side wall 53 so that the width dimension can be accommodated in the case 19. Next, as shown in FIGS. 9C and 9D, if a roll folding process is performed in which the upper edge 51a side of the airbag 51 is wound on the side of the vehicle body side wall 53 and approached to the lower edge 51b side, the airbag 51 is obtained. The folding process can be completed.

その後、折り崩れ防止用の破断可能な図示しないラッピングフィルムにより、エアバッグ51をくるむ。この時、孔54・55から突出したインフレーター46のボルト46dや本体部46aの端部は、ラッピングフィルムから突出させておく。なお、ラッピングフィルムとしては、樹脂製のシート材の他、エアバッグ51を形成した織布等の布材・テープ材・紐材を利用してもよい。   Thereafter, the airbag 51 is wrapped with a wrapping film (not shown) that can be broken to prevent it from collapsing. At this time, the bolt 46d of the inflator 46 and the end of the main body 46a protruding from the holes 54 and 55 are protruded from the wrapping film. In addition, as a wrapping film, you may utilize cloth materials, tape materials, and a string material, such as a woven fabric in which the airbag 51 is formed, in addition to a resin sheet material.

そして、取付ベース部材11のケース19内に、エアバッグ51を収納するとともに、インフレーター46のコネクタ48側の端部を貫通孔23aから突出させ、かつ、各ボルト46dを、貫通孔25aから突出させて、突出したボルト46dに、薄板状の図示しないスプリングナットを締め付ければ、インフレーター46とエアバッグ51とをケース19に取り付けることができる。   The airbag 51 is housed in the case 19 of the mounting base member 11, the end of the inflator 46 on the connector 48 side protrudes from the through hole 23 a, and each bolt 46 d protrudes from the through hole 25 a. Thus, the inflator 46 and the airbag 51 can be attached to the case 19 by fastening a thin plate-like spring nut (not shown) to the protruding bolt 46d.

その後、取付ベース部材11にエアバッグカバー29を取り付ける。この取り付けは、まず、ニーパネル13の車両後方側から、各貫通孔16に対して、対応する取付片37を挿入させて、各係止孔37aに対し、フック17を挿入させて、係止孔37a周縁に係止させる。また、取付片38をケース19の下壁部24の下方側付近に配置させるとともに、取付ブラケット27の各係止爪部27bを、取付片38の下方側から各係止孔38aに挿入させて、係止孔38a周縁に係止させ、そして、取付ブラケット27の各取付孔27aにボルト46dを貫通させて、各ボルト46dにナット47を締結すれば、エアバッグカバー29が取付ベース部材11に取り付けられて、エアバッグ組付体SAを形成することができる。   Thereafter, the airbag cover 29 is attached to the attachment base member 11. In this attachment, first, the corresponding attachment piece 37 is inserted into each through hole 16 from the vehicle rear side of the knee panel 13, and the hook 17 is inserted into each engagement hole 37a. 37a is engaged with the periphery. In addition, the mounting piece 38 is disposed in the vicinity of the lower side of the lower wall portion 24 of the case 19, and each locking claw portion 27 b of the mounting bracket 27 is inserted into each locking hole 38 a from the lower side of the mounting piece 38. The airbag cover 29 is attached to the attachment base member 11 by engaging the engagement holes 38a with the periphery of the engagement holes 38a, passing the bolts 46d through the attachment holes 27a of the attachment bracket 27, and fastening the nuts 47 to the respective bolts 46d. Attached to form the airbag assembly SA.

このようなエアバッグ組付体SAは、ニーパネル13の各取付ブラケット部14を、ボルト10を利用して、ボディ1側のブラケット1aに固定すれば、車両に膝保護用エアバッグ装置Sを搭載することができる。   In such an airbag assembly SA, if each mounting bracket portion 14 of the knee panel 13 is fixed to the bracket 1a on the body 1 side using the bolt 10, the airbag device S for knee protection is mounted on the vehicle. can do.

なお、エアバッグ装置Sの車両搭載後には、リード線49を所定のエアバッグ作動回路に結線したコネクタ48を、インフレーター46の本体部46aに結合させるとともに、インパネ8のアッパパネル8aやロアパネル8bを、車両に組み付けることとなる。   After the air bag device S is mounted on the vehicle, the connector 48 in which the lead wire 49 is connected to a predetermined air bag operating circuit is coupled to the main body 46a of the inflator 46, and the upper panel 8a and the lower panel 8b of the instrument panel 8 are connected. It will be assembled to the vehicle.

車両へのエアバッグ装置Sの搭載後、インフレーター46に所定の電気信号が入力されれば、ガス吐出口46bから膨張用ガスが吐出されて、エアバッグ51は、膨張して、図示しないラッピングフィルムを破断するとともにエアバッグカバー29の扉部32・34を押し、破断予定部31を破断させて、上下の扉部32・34を、それぞれ、ヒンジ部33・35を回転中心として、上下に開かせ、その結果、エアバッグ51は、ケース19の開口19aから、車両後方側へ突出し、さらに、横折りと縦折りとを解消しつつ、コラムカバー下面6aに沿うように、上方に向かって大きく展開膨張して、乗員Mの膝Kを保護することができる(図1・2の二点鎖線・図10参照)。   If a predetermined electrical signal is input to the inflator 46 after the airbag device S is mounted on the vehicle, the inflation gas is discharged from the gas discharge port 46b, and the airbag 51 is inflated. And the door parts 32 and 34 of the airbag cover 29 are pushed to break the part to be broken 31, and the upper and lower door parts 32 and 34 are opened up and down around the hinge parts 33 and 35, respectively. As a result, the airbag 51 protrudes from the opening 19a of the case 19 to the rear side of the vehicle, and further increases upward along the column cover lower surface 6a while eliminating lateral folding and vertical folding. The knee K of the occupant M can be protected by expanding and inflating (see the two-dot chain line in FIGS. 1 and 2 and FIG. 10).

そして、実施形態の膝保護用エアバッグ装置Sでは、下開きの下扉部34のヒンジ部35とケース19の下壁部24の後端24aとが、共に、基準線Xに沿って、エアバッグ51の中心部位C付近より、前方側に、配置されている。そのため、折り畳まれたエアバッグ51が、折りを解きつつ、ケース19の開口19aから車両後方側へ突出する際、エアバッグ51の下方側には、下扉部32は既に開いて配置されておらず、また、ケース19の下壁部24も当初から配置されていないことから、エアバッグ51は、図10に示すように、膨張初期時に、下方側からの規制力を受けることとがなく、下方側への飛び出し量が多くなって、車両後方側への飛び出し量が抑えられ、そして、膝Kを保護可能に膨張を完了させることとなる。   In the knee protection airbag device S of the embodiment, the hinge portion 35 of the lower door portion 34 of the lower opening and the rear end 24a of the lower wall portion 24 of the case 19 are both along the reference line X. The bag 51 is arranged on the front side from the vicinity of the central portion C of the bag 51. Therefore, when the folded airbag 51 is unfolded and protrudes from the opening 19a of the case 19 toward the rear side of the vehicle, the lower door portion 32 is already opened and disposed on the lower side of the airbag 51. In addition, since the lower wall portion 24 of the case 19 is not arranged from the beginning, the airbag 51 does not receive a regulating force from the lower side at the initial stage of inflation, as shown in FIG. The amount of protrusion to the lower side is increased, the amount of protrusion to the rear side of the vehicle is suppressed, and the knee K is completed to be able to be protected.

したがって、実施形態の膝保護用エアバッグ装置Sでは、膨張初期時に、後方側への飛び出し量を抑えて、エアバッグ51を展開膨張させることができ、前方側に位置する乗員Mの脛Lへの押圧力を低減できる。また、板金製のケース19の下壁部24を、従来品より前方側に縮めるように短くできることから、エアバッグ装置Sを軽量にすることも可能となる。   Therefore, in the knee protection airbag device S of the embodiment, the airbag 51 can be deployed and inflated while suppressing the amount of protrusion to the rear side at the initial stage of inflation, and to the shin L of the occupant M located on the front side. The pressing force can be reduced. Further, since the lower wall portion 24 of the sheet metal case 19 can be shortened so as to be contracted to the front side of the conventional product, the airbag device S can be reduced in weight.

なお、実施形態の場合には、エアバッグ51が、左右方向の折目を付けて折り畳む横折り工程において、エアバッグ51の上縁51a側を膨張完了時の車両前方側となる車体側壁部53の側で巻き付けるロール折りによって、折り畳んでおり、このような横折り工程では、ロール折りの折りを解消する際、解けていない部位が、解けている部位の遠心力を受け、コラムカバー6の下面6aに接近して、順次、折りを解消させることとなる。そのため、実施形態のように、ケース19内に収納されたエアバッグ51が開口19aから車両後方側へ突出する展開膨張初期時に、エアバッグ51を下方側から支持(規制)する下壁部24や扉部34の前部34bが無くとも、エアバッグ51は、車両後方側への突出を抑えて、コラムカバー下面6aに沿って、円滑に、上方に展開膨張することができる。   In the case of the embodiment, in the lateral folding process in which the airbag 51 is folded with a fold in the left-right direction, the vehicle body side wall portion 53 that becomes the vehicle front side when the upper edge 51a of the airbag 51 is completely inflated. In such a horizontal folding process, when the folding of the roll fold is eliminated, the unresolved part receives the centrifugal force of the unwound part, and the lower surface of the column cover 6 is folded. 6a is approached and the folds are sequentially eliminated. Therefore, as in the embodiment, when the airbag 51 housed in the case 19 is initially deployed and inflated to protrude from the opening 19a toward the vehicle rear side, the lower wall portion 24 that supports (regulates) the airbag 51 from the lower side, Even without the front portion 34b of the door portion 34, the airbag 51 can be smoothly expanded and inflated upward along the column cover lower surface 6a while suppressing the protrusion to the vehicle rear side.

また、実施形態では、下開きの下扉部34の前部34bを、取付ブラケット27を利用して、ケース19側に固定した場合を示したが、図11に示すエアバッグカバー29Aのように、取付ブラケット27を使用することなく、下扉部34Aの前部34bを前方側に延設させて、取付片38Aとして、この取付片38Aに、インフレーター46の各ボルト46dを挿通させる取付孔38bを設け、取付片38A自体をボルト46d・ナット47を利用して、ケース19の底壁部25に取り付けてもよい。なお、このエアバッグカバー29Aの下扉部34Aのヒンジ部35も、ケース19の下壁部24の後端24aと略一致して、基準線Xに沿って、エアバッグ51の中心部位C付近より、前方側に、配置されている。   In the embodiment, the front portion 34b of the lower door portion 34 of the lower opening is fixed to the case 19 side using the mounting bracket 27. However, like the airbag cover 29A shown in FIG. Without using the mounting bracket 27, the front portion 34b of the lower door portion 34A extends forward, and the mounting piece 38A is used as a mounting hole 38b through which each bolt 46d of the inflator 46 is inserted. And the attachment piece 38A itself may be attached to the bottom wall portion 25 of the case 19 using the bolt 46d and the nut 47. The hinge portion 35 of the lower door portion 34A of the airbag cover 29A also substantially coincides with the rear end 24a of the lower wall portion 24 of the case 19 and is near the central portion C of the airbag 51 along the reference line X. It is arranged on the front side.

また、エアバッグカバーとしては、図12に示すエアバッグカバー29Bのように、下扉部34の下方側に、エアバッグ装置の非作動時に乗員の指等による取付ブラケット27との接触を防止できるように、カバー本体部30の下縁30bから下方に延びる庇部30cを形成してもよい。   Further, as the airbag cover, as in the airbag cover 29B shown in FIG. 12, the lower side of the lower door portion 34 can be prevented from coming into contact with the mounting bracket 27 by the occupant's fingers or the like when the airbag apparatus is not in operation. As described above, the flange portion 30c extending downward from the lower edge 30b of the cover main body portion 30 may be formed.

さらに、実施形態では、エアバッグ51の折り畳み工程において、まず、縦折り工程を行って、横折り工程を行った場合を示したが、図13に示すように、まず、横折り工程を行い、ついで、縦折り工程を行って、エアバッグ51を折り畳んでもよい。すなわち、まず、図13のA・Bに示すように、エアバッグ51の上縁51a側を、車体側壁部53の側で巻いて、下縁51b側に接近させるロール折り行程を行なう。ついで、図13のB・Cに示すように、ケース19内に収納可能な左右方向の幅寸法とするように、左右両縁51c・51b側を下方側に折り返す縦折り工程を行って、折り畳み工程を完了させる。このような折り畳み工程でも、実施形態と同様に、ケース19内に収納して車両に搭載すれば、エアバッグ51の展開膨張時におけるロール折りの折りの解消時には、解けていない部位が、解けている部位の遠心力を受け、コラムカバー6の下面6aに接近して、順次、折りを解消させることとなるため、エアバッグ51は、車両後方側への突出を抑えて、コラムカバー下面6aに沿って、円滑に、上方に展開膨張することができる。   Furthermore, in the embodiment, in the folding process of the airbag 51, first, the vertical folding process is performed, and the horizontal folding process is performed, but as shown in FIG. 13, first, the horizontal folding process is performed, Subsequently, the airbag 51 may be folded by performing a vertical folding process. That is, first, as shown in FIGS. 13A and 13B, a roll folding process is performed in which the upper edge 51a side of the airbag 51 is wound on the side of the vehicle body side wall 53 to approach the lower edge 51b side. Next, as shown in FIGS. 13B and 13C, a vertical folding process is performed in which the left and right edges 51c and 51b are folded downward so that the width in the left and right directions can be accommodated in the case 19. Complete the process. Even in such a folding process, as in the embodiment, if it is housed in the case 19 and mounted on the vehicle, the unfolded part can be unraveled when the roll fold is resolved when the airbag 51 is deployed and inflated. The airbag 51 receives the centrifugal force of the area where it is approached and approaches the lower surface 6a of the column cover 6 to sequentially cancel the folding. Therefore, the airbag 51 is prevented from projecting to the rear side of the vehicle, and the column cover lower surface 6a And can be expanded and expanded upward smoothly.

さらにまた、実施形態では、エアバッグカバー29の下扉部34のヒンジ部35と、ケース19の下壁部24の後端24aとを略一致させて、基準線Xに沿って、エアバッグ51の中心部位C付近より、前方側に、配置させた場合を示したが、ヒンジ部35と後端24aとは、基準線Xに沿って、エアバッグ51の中心部位C付近より、前方側に配置されていれば、基準線Xに沿う前後方向の配置位置を、一致させていなくともよい。   Furthermore, in the embodiment, the hinge portion 35 of the lower door portion 34 of the airbag cover 29 and the rear end 24a of the lower wall portion 24 of the case 19 are made to substantially coincide with each other, and the airbag 51 is moved along the reference line X. The hinge portion 35 and the rear end 24a are arranged along the reference line X from the vicinity of the central portion C of the airbag 51 toward the front side. If arranged, the arrangement positions in the front-rear direction along the reference line X may not be matched.

なお、エアバッグカバー29の下扉部34のヒンジ部35と、ケース19の下壁部24の後端24aと、を、基準線Xに沿って、エアバッグ51の中心部位C付近より、前方側に、配置させる場合、実施形態のように、エアバッグ51の折り畳んだ本体58の前端58a若しくはインフレーター46の後端46eより、下扉部34のヒンジ部35や下壁部24の後端24aを、基準線Xに沿って、前方側に配設させれば、膨張初期のエアバッグ51の下方側を規制する部材が殆どなくなる状態となることから、エアバッグ51の下方への飛び出しを助長することとなって、エアバッグ51の後方側への飛び出し量を、極力、低減できる。   The hinge portion 35 of the lower door portion 34 of the airbag cover 29 and the rear end 24a of the lower wall portion 24 of the case 19 are moved forward along the reference line X from the vicinity of the central portion C of the airbag 51. When arranged on the side, as in the embodiment, from the front end 58a of the folded main body 58 of the airbag 51 or the rear end 46e of the inflator 46, the hinge portion 35 of the lower door portion 34 and the rear end 24a of the lower wall portion 24 are used. Is disposed on the front side along the reference line X, there is almost no member for regulating the lower side of the airbag 51 in the initial stage of inflation. As a result, the amount of protrusion of the airbag 51 to the rear side can be reduced as much as possible.

そしてさらに、下扉部のヒンジ部としては、インフレーター46の前方側に配置させてもよい。すなわち、図11に示すヒンジ部35Aのように、ケース底壁部25の下部側に配置させてもよい。   Further, the hinge portion of the lower door portion may be disposed on the front side of the inflator 46. That is, you may arrange | position to the lower part side of the case bottom wall part 25 like 35 A of hinge parts shown in FIG.

また、実施形態では、運転者Mの膝Kを保護するために、運転者Mの車両前方側に配置されるエアバッグ装置Sを例に採り説明したが、助手席に着座した助手席搭乗者の膝を保護可能なエアバッグ装置に、本発明を適用してもよい。   In the embodiment, the airbag apparatus S disposed on the front side of the vehicle of the driver M is taken as an example in order to protect the knee K of the driver M. However, the passenger in the passenger seat sitting on the passenger seat has been described. The present invention may be applied to an airbag device capable of protecting the knee.

さらに、実施形態の場合には、エアバッグ51の展開膨張時に開く扉部として、下開きの下扉部34とともに、上開きで開く上扉部32を、エアバッグカバー29に配設した場合を示したが、車両後方側から見た破断予定部31を、略逆U字状として、大きな面積の下扉部34だけで、エアバッグ51の膨張時に開く扉部を構成してもよい。但し、実施形態のように、上下に二つの扉部32・34を設けた場合には、迅速に開口19aを開口させることができることから、好ましい。   Furthermore, in the case of the embodiment, the case where the upper door portion 32 that opens with the upper opening is disposed in the airbag cover 29 together with the lower door portion 34 with the lower opening as the door portion that opens when the airbag 51 is deployed and inflated. Although shown, the breakable portion 31 viewed from the rear side of the vehicle may have a substantially inverted U shape, and the door portion that opens when the airbag 51 is inflated may be configured with only the lower door portion 34 having a large area. However, when the two door portions 32 and 34 are provided on the upper and lower sides as in the embodiment, it is preferable because the opening 19a can be quickly opened.

本発明の実施形態における膝保護用エアバッグ装置の使用状態を示す車両前後方向の概略縦断面図である。It is a schematic longitudinal cross-sectional view of the vehicle front-back direction which shows the use condition of the airbag apparatus for knee protection in embodiment of this invention. 同実施形態の膝保護用エアバッグ装置の使用状態を示す車両後方側から見た正面図である。It is the front view seen from the vehicle rear side which shows the use condition of the airbag apparatus for knee protection of the embodiment. 実施形態である膝保護用エアバッグ装置の車両前後方向の概略拡大縦断面図である。It is a general | schematic expanded longitudinal cross-sectional view of the vehicle front-back direction of the airbag apparatus for knee protection which is embodiment. 実施形態の膝保護用エアバッグ装置における車両前後方向の概略拡大横縦断面図であり、図3のIV−IV部位に対応する。It is a general | schematic expansion horizontal longitudinal cross-sectional view of the vehicle front-back direction in the airbag apparatus for knee protection of embodiment, and respond | corresponds to the IV-IV site | part of FIG. 実施形態のニーパネルとエアバッグカバーのパネルカバー部との連結状態を示す概略縦断面図であり、図6のV−V部位付近を示す。It is a schematic longitudinal cross-sectional view which shows the connection state of the knee panel of embodiment, and the panel cover part of an airbag cover, and shows the VV site | part vicinity of FIG. 実施形態の膝保護用エアバッグ装置におけるニーパネル、ケース、及び、エアバッグカバーの分解斜視図である。It is a disassembled perspective view of the knee panel, case, and airbag cover in the airbag apparatus for knee protection of the embodiment. 実施形態に使用するエアバッグの正面図である。It is a front view of the airbag used for an embodiment. 実施形態のエアバッグの縦断面図であり、図7のVIII−VIII部位に対応する。It is a longitudinal cross-sectional view of the airbag of embodiment, and respond | corresponds to the VIII-VIII site | part of FIG. 実施形態のエアバッグの折り畳み工程を説明する図である。It is a figure explaining the folding process of the airbag of an embodiment. 実施形態の膝保護用エアバッグ装置におけるエアバッグの膨張完了時を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the time of completion | finish of inflation of the airbag in the airbag apparatus for knee protection of embodiment. 実施形態の膝保護用エアバッグ装置に使用するエアバッグカバーの変形例を示す図である。It is a figure which shows the modification of the airbag cover used for the airbag apparatus for knee protection of embodiment. 実施形態の膝保護用エアバッグ装置に使用するエアバッグカバーの他の変形例を示す図である。It is a figure which shows the other modification of the airbag cover used for the airbag apparatus for knee protection of embodiment. 実施形態のエアバッグの他の折り畳み工程を説明する図である。It is a figure explaining the other folding process of the airbag of embodiment.

符号の説明Explanation of symbols

19…ケース、
19a…開口、
21…上壁部、
22…左側壁部、
23…右側壁部、
24…下壁部、
24a…後端、
25…底壁部、
29・29A・29B…エアバッグカバー、
34・34A…下扉部、
34a…上縁、
35…ヒンジ部、
46…インフレーター、
C…(折り畳んで収納されたエアバッグの)収納中心、
X…基準線、
K…膝、
M…(乗員)運転者、
S…膝保護用エアバッグ装置。
19 ... Case,
19a ... opening,
21 ... Upper wall,
22 ... Left side wall,
23 ... right side wall,
24 ... lower wall,
24a ... rear end,
25 ... bottom wall,
29 ・ 29A ・ 29B… Airbag cover,
34 / 34A ... Lower door,
34a ... upper edge,
35 ... Hinge part,
46 ... Inflator,
C ... Storage center (for airbags folded and stored),
X ... reference line,
K ... knees,
M ... (Crew) Driver,
S: Air bag device for knee protection.

Claims (1)

着座した乗員の膝の前方側に配設されて、
前記膝を保護可能に膨張するエアバッグと、該エアバッグ内に配設されて前記エアバッグを膨張させるための膨張用ガスを吐出するインフレーターと、折り畳まれた前記エアバッグをインフレーターとともに収納するケースと、折り畳まれた前記エアバッグを突出可能に覆うエアバッグカバーと、を備えて構成され、
前記ケースが、前記エアバッグを後方側へ突出可能な開口を後端側に有して、上壁部、左右の側壁部、下壁部、及び、前端側に配置される底壁部、を備えて構成され、
前記エアバッグカバーが、膨張時の前記エアバッグに押されて、上縁側を下方に回転させるように、下開きで開く扉部を備えて構成される膝保護用エアバッグ装置であって、
前記ケースの底壁部側から前記上壁部に沿って後方側へ延びる直線を基準線として、下開きで開く前記扉部のヒンジ部と前記ケースの下壁部の後端との配置位置が、共に、折り畳まれて前記ケース内に収納された前記エアバッグの中心部位付近より、前記基準線に沿う前方側に、配置されて、
車両に搭載されていることを特徴とする膝保護用エアバッグ装置。
Located on the front side of the seated occupant ’s knees,
An airbag that inflates the knee in a protective manner, an inflator that is disposed in the airbag and discharges an inflating gas for inflating the airbag, and a case that houses the folded airbag together with the inflator And an airbag cover that covers the folded airbag in a projectable manner,
The case has an opening on the rear end side through which the airbag can protrude rearward, and an upper wall portion, left and right side wall portions, a lower wall portion, and a bottom wall portion disposed on the front end side. Configured with
The knee cover airbag device is configured to include a door portion that is opened downward so that the airbag cover is pushed by the airbag when inflated to rotate the upper edge side downward,
The arrangement position of the hinge portion of the door portion opened by opening downward and the rear end of the lower wall portion of the case with a straight line extending from the bottom wall portion side of the case to the rear side along the upper wall portion as a reference line In addition, from the vicinity of the central portion of the airbag folded and housed in the case, disposed on the front side along the reference line,
A knee protection airbag device mounted on a vehicle.
JP2003339502A 2003-09-30 2003-09-30 Air bag device for knee protection Pending JP2005104269A (en)

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DE102004047332A DE102004047332B4 (en) 2003-09-30 2004-09-29 Knee protection airbag device

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JP2008174210A (en) * 2006-12-19 2008-07-31 Mazda Motor Corp Leg part protection air bag device for vehicle
WO2009054261A1 (en) * 2007-10-22 2009-04-30 Ashimori Industry Co., Ltd. Knee-protecting airbag device
US7604250B2 (en) 2005-05-18 2009-10-20 Toyoda Gosei Co., Ltd. Airbag device
JP2011046259A (en) * 2009-08-26 2011-03-10 Toyoda Gosei Co Ltd Airbag device for knee protection
KR101054203B1 (en) * 2009-01-05 2011-08-03 아우토리브 디벨롭먼트 아베 Knee airbag cushion assembly and folding method
KR102064848B1 (en) * 2018-07-17 2020-01-10 아우토리브 디벨롭먼트 아베 Knee airbag and folding method for vehicle

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US8444177B2 (en) 2008-02-25 2013-05-21 Autoliv Development Ab Assembly with an instrument panel for a motor vehicle and a knee airbag
DE102010030196A1 (en) * 2010-06-17 2011-12-22 Bayerische Motoren Werke Aktiengesellschaft Knee airbag arrangement for use in vehicle, has H-shaped material weakening part including rear tab-like portion folding up during release of air bag module, so that edge covers and acts as ramp shot for unfolding knee airbag
DE102010030194B4 (en) * 2010-06-17 2018-06-07 Bayerische Motoren Werke Aktiengesellschaft Knee airbag arrangement for vehicles
KR101520850B1 (en) 2012-03-05 2015-05-20 아우토리브 디벨롭먼트 아베 Manufacturing method of knee airbag cushion
US11351945B1 (en) * 2021-01-20 2022-06-07 Faurecia Interior Systems, Inc. Knee airbag cover

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AU2001269455A1 (en) * 2000-07-07 2002-01-21 Toyoda Gosei Co. Ltd. Air bag device for knee protection
JP3743360B2 (en) * 2001-12-06 2006-02-08 豊田合成株式会社 Air bag storage method for knee protection airbag device

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US7604250B2 (en) 2005-05-18 2009-10-20 Toyoda Gosei Co., Ltd. Airbag device
DE102006023203B4 (en) * 2005-05-18 2009-12-10 Toyoda Gosei Co., Ltd., Nishikasugai airbag device
JP2008174210A (en) * 2006-12-19 2008-07-31 Mazda Motor Corp Leg part protection air bag device for vehicle
WO2009054261A1 (en) * 2007-10-22 2009-04-30 Ashimori Industry Co., Ltd. Knee-protecting airbag device
US7954845B2 (en) 2007-10-22 2011-06-07 Ashimori Industry Co., Ltd. Knee-protecting airbag device
KR101054203B1 (en) * 2009-01-05 2011-08-03 아우토리브 디벨롭먼트 아베 Knee airbag cushion assembly and folding method
JP2011046259A (en) * 2009-08-26 2011-03-10 Toyoda Gosei Co Ltd Airbag device for knee protection
KR102064848B1 (en) * 2018-07-17 2020-01-10 아우토리브 디벨롭먼트 아베 Knee airbag and folding method for vehicle

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