WO2011136297A1 - 助手席用エアバッグ装置 - Google Patents
助手席用エアバッグ装置 Download PDFInfo
- Publication number
- WO2011136297A1 WO2011136297A1 PCT/JP2011/060317 JP2011060317W WO2011136297A1 WO 2011136297 A1 WO2011136297 A1 WO 2011136297A1 JP 2011060317 W JP2011060317 W JP 2011060317W WO 2011136297 A1 WO2011136297 A1 WO 2011136297A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cushion
- passenger seat
- airbag device
- instrument panel
- protrusion
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
- B60R21/205—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in dashboards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/2334—Expansion control features
- B60R21/2338—Tethers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/233—Inflatable members characterised by their shape, construction or spatial configuration comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other
- B60R2021/23316—Inner seams, e.g. creating separate compartments or used as tethering means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/2334—Expansion control features
- B60R21/2338—Tethers
- B60R2021/23382—Internal tether means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2304/00—Optimising design; Manufacturing; Testing
- B60Y2304/05—Reducing production costs, e.g. by redesign
Definitions
- the present invention relates to an airbag device, and more particularly to a passenger seat airbag device.
- the airbag device for the passenger seat is stored in the instrument panel of the vehicle, and when the vehicle suddenly stops due to a collision or the like, the gas is supplied from the inflator attached to the airbag device and set on the top surface of the instrument panel. Protect the passenger in the passenger seat by expanding and deploying between the windshield (front window) and the passenger in the passenger seat from the unfolded door.
- This airbag device for the passenger seat stabilizes its behavior by contacting the windshield and the upper surface of the instrument panel during inflation and deployment.
- the behavior of the cushion (bag) of the airbag device becomes unstable.
- it is necessary to increase the capacity of the cushion so as to fill the space between the passenger and the windshield and instrument panel of the vehicle body so that the passenger can be reliably received. Therefore, the cushion of the airbag device for the passenger seat tends to have a large capacity.
- FIG. 7 shows an example of such a passenger seat airbag device.
- the cushion 100 of the airbag device for a passenger seat has an occupant facing surface 102 on the front end side and a windshield facing surface 104 on the upper side, and the occupant facing surface 102 and the windshield facing surface 104 are internal.
- the members 106 are connected to each other by members 106.
- the inflator 112 performs gas ejection operation
- the occupant facing surface 102 expands so as to approach the occupant due to the gas pressure, and the middle portion of the windshield facing surface 104 in the vertical direction passes through the internal member 106. Then, it is pulled by the occupant-facing surface 102 and developed into a recessed shape inside the cushion so as to be separated from the windshield 122. Thereby, the capacity
- the cushion serves as an occupant protection unit capable of interfering with an occupant seated in the passenger seat.
- a configuration comprising a first inflating portion and a second inflating portion that is inflated by an inflating gas flowing from the first inflating portion between the first inflating portion and the instrument panel when the first inflating portion is inflated. It is known (see Patent Document 2).
- the cushion 100 of the airbag device described in Patent Document 1 has a reduced capacity on the windshield side, the behavior of the cushion during deployment may be difficult to stabilize, and the internal member 106 may be unstable. Is required separately, and the work for attaching it to the occupant facing surface 102 and the windshield facing surface 104 is time-consuming. Therefore, the cost is higher than a cushion that is simply created by joining the base fabric. There is also the problem of hanging. Further, the structure of the airbag device for the passenger seat described in Patent Document 2 is more complicated than that described in Patent Document 1 and is not only costly but also the capacity of the cushion of the airbag device. It is not always possible to reduce
- the cushion 10 when the capacity of the cushion is simply reduced as a whole, for example, as shown in FIG. 8, the cushion 10 that has started inflating and deploying from the upper surface of the instrument panel 20 fills the gap between the instrument panel 20 and the windshield 25. Without being exhausted, it develops on the passenger side along the upper surface of the instrument panel 20 (FIGS. 8A to 8D).
- the cushion 10 is once lowered to the position on the front side of the instrument panel 20 in the process of inflating and deploying (see FIG. 8E), but when the gas pressure from the inflator is further filled, the cushion 10 rises and moves away from the panel surface side (see FIG. 8F). Therefore, the behavior of the cushion is unstable, and there is a possibility that the support position of the cushion when the occupant enters the cushion is not stable and the support is not sufficiently performed.
- the present invention has been made in view of the above-mentioned problems of the conventional passenger seat airbag device, and its object is to reduce the capacity of the cushion of the passenger seat airbag device, and at the time of inflation and deployment. It is to provide a passenger seat airbag device having a stable behavior and sufficient shock absorbing performance at low cost.
- a passenger seat airbag device is a passenger seat airbag device installed on an instrument panel including a cushion and an inflator for supplying gas into the cushion, wherein the airbag device is deployed and inflated. It is characterized by providing the protrusion used as the support means at the time of a passenger
- the passenger seat airbag device of the present invention is characterized in that, in the passenger seat airbag device described in (1) above, a recess is formed adjacent to at least one of the protrusions.
- the airbag device for a passenger seat according to the present invention is the airbag device for a passenger seat described in (1) or (2) above, wherein the protrusion is at the time of inflating and deploying the airbag device for a passenger seat. It extends in the direction of the resultant force of gravity acting on the cushion and advance input by the occupant entering.
- a passenger seat airbag device according to the present invention is the passenger seat airbag device described in any one of (1) to (3) above, and a main panel provided with a facing surface facing an occupant; It is characterized by comprising left and right side panels joined to both side edges of the main panel.
- a passenger seat airbag device is the passenger seat airbag device described in any one of (1) to (4) above, wherein the passenger seat airbag device is installed on the upper surface of the instrument panel.
- the portion that fills the gap between the windshield and the upper surface of the instrument panel during expansion and deployment is formed in a shape corresponding to the gap.
- the passenger seat airbag device according to the present invention is the passenger seat airbag device described in (4) or (5) above, wherein the protrusion joins the ends of the panels constituting the main panel. It is characterized by being formed.
- a passenger seat airbag device at a low cost, which has a stable behavior during inflation and deployment and a sufficient shock absorbing performance while reducing its capacity.
- FIG. 1 is a perspective view when the cushion 10 of the airbag device for a passenger seat according to the embodiment of the present invention is inflated.
- FIG. 2 is a side view of the cushion 10 when inflated, and shows a state before an occupant enters.
- the cushion 10 of the airbag device 1 for a passenger seat according to the embodiment of the present invention includes a main panel 12 and both side panels 14, that is, three pieces, and the side panels 14 are provided on both side edges of the single main panel 12. It is composed of an integrated structure with a mounting.
- the main panel 12 is provided with an opening 15 for attaching an inflator.
- the cushion 10 has an attachment portion 10 a of the inflator 30 and a protrusion 10 b that contacts the side surface of the instrument panel 20 on the instrument panel side (hereinafter simply referred to as the back surface side) as viewed from the passenger side, Between the protrusion 10b and the protrusion 10b, a recess, that is, a recess 10c is formed adjacent to the protrusion 10b, and a recess 10d is provided below the protrusion 10b, and the recess 10d.
- the other side is connected to the occupant side, that is, the surface side, and the occupant-facing surface is a smooth surface that reduces the impact when the occupant enters.
- the side panel 14 is cut into a shape corresponding to the protrusion 10b, the recess 10c, and the recess 10d in order to realize the back surface shape of the cushion 10 of the passenger seat airbag device 1.
- the cushion 10 is formed by joining the left and right side panels 14 cut into the above-mentioned shape to both side edges of the main panel 12 by, for example, stitching (joint by means such as adhesive other than stitching). As long as the required strength is met.)
- the protrusion 10b of the cushion 10 has an outer shape formed by a side having an arbitrary small curvature, and the front end of the cushion 10 abuts against the front surface 22 of the instrument panel 20 when the cushion 10 is inflated and deployed, and an occupant enters.
- crew when it hits is comprised.
- FIG. 3 is a side view showing a state where the occupant enters the cushion 10, and shows the force acting when the occupant enters, disassembled.
- the cushion 10 expands outward while being expanded by a gas jet on the instrument panel 20 as shown in FIG. 5 described later.
- the cushion 10 is deployed outward from the upper surface of the instrument panel 20, the cushion 10 is deployed so as to turn downward under the influence of the weight of the cushion 10, and the protrusion 10 b comes into contact with the front surface 22 of the instrument panel 20.
- the second depression 10d prevents the cushion 10 from expanding and developing downward, and the protrusion 10b is kept in contact with the front surface 22 of the instrument panel 20 by the gas pressure from the inflator. Therefore, the position of the cushion 10 at the time of inflating and deploying can be stabilized.
- F1 to F3 in FIG. 3 indicate the relationship of forces acting on the cushion 10 when the occupant enters the cushion 10 in the expanded and deployed state as described above. That is, F1 represents a force vector (magnitude and direction) acting on the cushion 10 when the passenger's head enters the cushion 10, and F2 represents a gravity vector acting on the cushion 10. F3 represents the vector of the resultant force of both vectors F1 and F2, that is, the direction and magnitude of the force actually acting on the cushion 10 when the occupant enters the inflated and deployed cushion 10.
- the protrusion 10b is preferably provided so as to extend in the direction of the vector F3 in consideration of the force vector F3.
- the force is transmitted as it is to the front surface 22 of the instrument panel 20 through the protrusion 10b, and as a result of balancing with the drag, the cushion 10 is in a stable state (that is, blind motion). (Without) shocks caused by passenger collisions can be mitigated.
- the portion other than the acting portion of the vector F3 on the back side of the cushion 10 that is, the portion other than the projection 10b, transmits force. Since it is clear that it is not involved, it is not necessary for the portion to be in contact with the instrument panel 20, and it can be seen that the capacity of the portion can be reduced. Therefore, in the present embodiment, while the protrusion 10b of the cushion 10 is brought into contact with the front surface 22 of the instrument panel 20, a portion other than the protrusion 10b is cut inward as much as possible to form a recess, thereby expanding. The capacity of the cushion 10 is reduced while stabilizing the behavior of the airbag device during deployment.
- the airbag device 1 for the passenger seat according to the present embodiment can relatively reduce the output of the inflator as the capacity of the cushion 10 is reduced as described above.
- the area of the side panel 14 to be performed can also be made relatively small. Thereby, the cost can be reduced. Further, since the capacity of the cushion 10 is reduced on the back surface side and the bottom surface side, there is no possibility that the support by the windshield 25 becomes insufficient and the behavior at the time of inflation and deployment becomes unstable.
- the extending direction of the protrusion 10b of the cushion 10 is set in accordance with the direction of the vector F3 when the occupant enters the cushion 10, but the occupant actually enters the passenger seat airbag device 1. Since the position to be changed can vary depending on the height and posture of the occupant, the direction of the vector F3 must be set with a certain width (allowable range). The actual width required can be determined based on the experimental results of the assumed height and posture of the occupant. In practice, the width of the projection 10b is predetermined within the numerical range obtained from the experimental results. The value multiplied by the safety factor is adopted.
- FIGS. 4A to 4F are schematic views for explaining the behavior of the cushion 10 of the passenger seat airbag device 1 according to the present embodiment when the cushion 10 is inflated and deployed.
- the cushion 10 starts to inflate and deploy from a set position on the upper surface of the instrument panel 20 and expands upward and rightward in the figure while being regulated between the windshield 25 and the upper surface of the instrument panel 20 (FIG. 4A-4C).
- the protrusion 10b descends while coming into contact with the front surface of the instrument panel 20 (see FIGS. 4D and 4E) and is stabilized at that position ( FIG. 4F).
- the cushion 10 of the present embodiment has the protrusion 10b on the back surface.
- the passenger seat airbag device 1 of the present embodiment when the capacity of the cushion 10 is reduced, a member other than the conventional base cloth is not used, and the protrusion 10b is formed. Since the side panel 14 cut with a reduced curvature so as to be formed may be simply joined along the edge of the main panel 12 by stitching or the like, the manufacturing cost can be reduced.
- the cushion 10 deploys outward as described above and deploys downward when removed from the upper surface of the instrument panel 20, and is a relatively early stage of deployment. Since the tip of the protrusion 10b contacts the front surface 22 of the instrument panel 20 and maintains this state, the behavior during deployment can be stabilized.
- FIG. 5 is a side view when the cushion 10 of the passenger seat airbag apparatus 1 according to the second embodiment is inflated and deployed.
- the cushion 10 abuts on the windshield 25 when inflated and deployed, and contacts the windshield 25 and the upper surface of the instrument panel 20 to stabilize its behavior.
- the cushion 10 of the present embodiment is formed such that the shape of the portion developed between the windshield 25 and the upper surface of the instrument panel 20 corresponds to the shape of the gap between the two.
- the shape and the like are the same as those of the airbag device 1 for the passenger seat according to the first embodiment.
- the cushion 10 of the passenger airbag device 1 according to the second embodiment can further reduce its capacity in addition to the passenger airbag device 1 of the first embodiment. That is, since the portion between the windshield 25 of the cushion 10 of the present embodiment and the upper surface of the instrument panel 20 is formed in a shape corresponding to the shape of the gap between the two portions, there is no excess between the two portions. This part does not protrude to the occupant side and bulge out. Therefore, an inflator output with a smaller capacity is sufficient, and the side panel 14 can be made smaller. Therefore, further cost reduction is possible.
- the protrusion 10b in the first and second embodiments, or a portion with a small curvature matched to the shape of the gap between the upper surface of the instrument panel 20 and the windshield 25 (here, the portion with a small curvature is a deformed portion.
- FIG. 6 is a view for explaining the suturing of the deformed portion.
- the passenger seat airbag device according to the present embodiment includes the main panel 12 and the left and right side panels 14.
- both ends of one main panel 12 are stitched to form a continuous piece, and left and right predetermined shapes are respectively formed on the sides of the continuous piece.
- the side panel 14 cut into pieces is stitched.
- the main panel 12 and the side panel 14 cannot prevent misalignment during stitching. Therefore, the above-described sewing method cannot stitch the deformed portion. Therefore, here, by changing the above sewing procedure, the end portions of the main panel 12 in the shape of a continuous piece are not sewn first, and the main panel 12 and the side panels 14 are moved in that state. Suture along the edges of each other (see FIG. 6A). At that time, the sewing start and end of the side panel 14 and the main panel 12 are overlapped so as not to be sewn. As a result, in a state where both the side panels 14 are stitched to the main panel 12, a square hole remains as an unsewn portion between the sewing start portion and the sewing end portion.
- the short side of the unsewn portion is folded inward in a V shape (see FIG. 6B), and the closed portion is sewn and joined (see FIG. 6C).
- the protruding portion 10b of the cushion 10 or a deformed portion such as a portion between the windshield 25 and the upper surface of the instrument panel 20 is formed into an arbitrary shape without considering its curvature. be able to.
- a plurality of deformed portions can be formed on the main panel 12.
- the main panel 12 is composed of a plurality of panels.
- the passenger seat airbag device 1 of the present embodiment can reduce the necessity of depending on the support force of the upper surface of the instrument panel 20 and the windshield 25 by providing the cushion 10 with the protrusion 10b. Therefore, there is an advantage that the design and the layout of the vehicle are hardly affected. Therefore, the weight can be reduced by improving the degree of freedom in the design and product planning of the airbag device 1 for the passenger seat and preventing the passenger seat from increasing in size. Further, since the protrusion 10b of the cushion 10 is provided so as to extend in the direction of the resultant force when the occupant enters, a reaction force (drag) from the instrument panel surface necessary for stabilizing the behavior of the cushion 10 is required.
- the cushion hangs down due to the head approach, that is, it tries to hang down in the tangential direction of a circle centering on the mounting portion of the airbag device and having a radius between the mounting portion and the head contact portion. It is possible to obtain a stable behavior at the time of shock absorption.
- SYMBOLS 1 Airbag apparatus for passenger seats, 10 ... Cushion, 10b ... Projection, 10c, 10d ... Recess, 12 ... Main panel, 14 ... Side panel, 20 ... Instrument panel, 25 ... Windshield.
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Abstract
Description
これを解消するためには、クッションの容量を増やして乗員と車体のウインドシールド及びインストルメントパネルとの間を埋め、確実に乗員を受け止めることができるようにする必要がある。そのため、助手席用エアバッグ装置のクッションは大容量のものとなり易い。
しかし、大出力のインフレータはコストが高くなるため、全体のコストアップの要因となり、しかもエアバッグ装置や付属部材の強度もその出力に併せて強化する必要があるため、その重量が増大する等の問題がある。
図7は、そのような助手席用エアバッグ装置の一例を示す。
この助手席用エアバッグ装置のクッション100は、その前端側に乗員対向面102を、また上側面にウインドシールド対向面104を有しており、乗員対向面102とウインドシールド対向面104とは内部部材106によって互いに連結された構造から成っている。そのため、インフレータ112がガス噴出作動した際には、そのガス圧によって乗員対向面102が乗員に接近するように膨張すると共に、ウインドシールド対向面104の上下方向の途中部分が、内部部材106を介して乗員対向面102によって引っ張られ、ウインドシールド122から離隔するようにクッションの内側に凹んだ形状に展開する。これにより、クッション100は、その容量を減じている。
また、特許文献2に記載された助手席用エアバッグ装置は、その構造は特許文献1に記載されたものよりもさらに複雑であり、コストが掛かるだけではなく、必ずしもエアバッグ装置のクッションの容量を減らせるとは限らない。
(2)本発明の助手席用エアバッグ装置は、上記(1)に記載された助手席用エアバッグ装置において、前記突部の少なくとも一方に隣接する窪みを形成したことを特徴とする。
(3)本発明の助手席用エアバッグ装置は、上記(1)又は(2)に記載された助手席用エアバッグ装置において、前記突部は、助手席用エアバッグ装置の膨張展開時におけるクッションに作用する重力と進入する乗員による進入力との合力の方向に延在することを特徴とする。
(4)本発明の助手席用エアバッグ装置は、上記(1)ないし(3)のいずれかに記載された助手席用エアバッグ装置において、乗員に対向する対向面を備えたメインパネルと、メインパネルの両側縁に接合された左右のサイドパネルとから成ることを特徴とする。
(5)本発明の助手席用エアバッグ装置は、上記(1)ないし(4)のいずれかに記載された助手席用エアバッグ装置において、助手席用エアバッグ装置はインストルメントパネル上面に設置されており、膨張展開時にウインドシールドとインストルメントパネル上面間の空隙を埋める部分が、前記空隙に対応した形状に形成されていることを特徴とする。
(6)本発明の助手席用エアバッグ装置は、上記(4)又は(5)に記載された助手席用エアバッグ装置において、前記突部はメインパネルを構成するパネルの端部同士を接合して形成されていることを特徴とする。
図1は、本発明の実施形態に係る助手席用エアバッグ装置のクッション10の膨張時における斜視図である。図2は、上記膨張時における上記クッション10の側面図であって、乗員が進入する前の状態を示す。
本発明の実施形態に係る助手席用エアバッグ装置1のクッション10は、メインパネル12と両サイドパネル14、つまりスリーピースで構成されており、一枚のメインパネル12の両側縁にそれぞれサイドパネル14を取り付けて一体化した構成から成っている。メインパネル12にはインフレータ取付用の開口15が設けられている。
サイドパネル14は、助手席用エアバッグ装置1のクッション10の裏面形状を実現するため、上記突部10b及び窪み10c及び窪み10dに対応した形状に裁断されている。
ここで、クッション10の突部10bは任意の小さな曲率の辺で形成された外形を有し、クッション10の膨張展開時にその先端がインストルメントパネル20の正面22に当接して、乗員が進入してきたときに乗員を受け止めるクッション10の支持部を構成する。
図3に示すように、インフレータ30からのガスがクッション10中に進入すると、後述する図5に示すように、クッション10はインストルメントパネル20上でガス噴流により膨張しつつ外方に展開する。クッション10がインストルメントパネル20の上面より外側に展開すると、クッション10の自重の影響を受けて下方へ回り込むように展開し、上記突部10bがインストルメントパネル20の正面22に当接する。
一旦当接すると、第2の窪み10dによって、クッション10の下方への膨張展開が抑えられて、上記突部10bはインフレータからのガス圧によりインストルメントパネル20の正面22との接触状態が維持され、したがって、膨張展開時におけるクッション10の位置を安定させることができる。
即ち、F1は、乗員の頭部がクッション10に進入する際に、クッション10に作用する力のベクトル(大きさと方向)を表す、また、F2はクッション10に作用する重力のベクトルを示す。F3は、両ベクトルF1とF2の合力のベクトル、即ち、乗員が膨張展開したクッション10に進入するとき、実際にクッション10に作用する力の方向と大きさを示している。
そこで、本実施形態では、クッション10の突部10bをインストルメントパネル20の正面22に当接させつつ、突部10b以外の部分をできる限り内方に切り込んで窪みを形成し、それによって、膨張展開時におけるエアバッグ装置の挙動を安定させつつクッション10の容量を削減させている。
実際にどの程度の幅が必要かは、想定される乗員の身長や姿勢についての実験結果に基づき決めることができ、実際には、上記突部10bの幅は実験結果で得た数値範囲に所定の安全率を掛けた数値が採用される。
クッション10がインストルメントパネル20の上面の設定位置から膨張展開を始め、ウインドシールド25とインストルメントパネル20の上面間で規制されながら上方及び図示右方向に展開していく様子を示している(図4A~4C参照)。上記クッション10の下面がインストルメントパネル20の上面から外側に出るに従い、上記突部10bがインストルメントパネル20の正面に当接しながら下降して(図4D、E参照)、その位置で安定する(図4F)。
本実施形態のクッション10と、図8に示す突部10bを設けず単に容量を削減したエアバッグ装置とを対比すれば明らかなように、本実施形態のクッション10はその裏面に突部10bを設けたことにより、インストルメントパネル20の外方に展開したとき、突部10bが下向きに展開してインストルメントパネル20の正面22に当接し、図8に示すようにクッション10が起き上がってインストルメントパネル20から離れることはない。
図5は、第2の実施形態に係る助手席用エアバッグ装置1のクッション10の膨張展開時における側面図である。
本実施形態では、クッション10は、膨張展開時にウインドシールド25に当接し、ウインドシールド25とインストルメントパネル20の上面と接触してその挙動を安定化させる。ここで、本実施形態のクッション10は、そのウインドシールド25とインストルメントパネル20の上面間に展開する部分の形状が、上記両者の間隙の形状に対応させた形状に形成されており、その他の形状等は第1の実施形態の助手席用エアバッグ装置1と同様である。
図6は、上記異形部の縫合について説明する図である。
既に述べたように、本実施形態に係る助手席用エアバッグ装置は、メインパネル12と左右のサイドパネル14とから成る。
ここで、上記異形部を縫合する際に通常の手順を適用すると、まず1枚のメインパネル12の両端部を縫合して連続片を形成し、その連続片の側面にそれぞれ左右の所定の形状に裁断したサイドパネル14を縫合する。この場合、互いに縫合するメインパネル12とサイドパネル14が縫合中に位置ずれを起こすと、縫合中にその位置ずれを吸収できないことから、メインパネル12とサイドパネル14との縫合部の縫合端の部分に皺が発生し、平滑な縫合面が得られず、波を打ったような形状になる。このような形状の縫合部分に、インフレータから高温高圧のガスが当たるとガス漏れが生じたり、極端な場合は破断することもあり得る。
そこで、ここでは、上記の縫製の手順を変えて、連続片の形状にしたメインパネル12の端部同士を最初に縫合せずフリーにしておき、その状態でメインパネル12と両サイドパネル14を、互いの縁部に沿って縫合する(図6A参照)。その際、サイドパネル14とメインパネル12の縫い始めと縫い終わりとを重ねて縫わないようにしておく。
これにより、メインパネル12に両サイドパネル14を縫合した状態では、縫い始めの部分と縫い終わりの部分間に四角形の穴が縫い残し部分として残る。次に、この縫い残し部分の短辺側を内側にV字状に折り込んで閉じ(図6B参照)、閉じたところを縫製して接合する(図6C参照)。
この方法で縫製することにより、クッション10の上記突部10bや、ウインドシールド25とインストルメントパネル20の上面間の部分のような異形部を、その曲率を考慮することなく任意の形状に形成することができる。
なお、メインパネル12に複数の異形部を形成することもできる。その場合はメインパネル12を複数のパネルで構成することになる。
したがって、助手席用エアバッグ装置1のデザインや商品企画の自由度を向上させ、且つ大型化することを防ぐことで、その重量を低減することができる。また、クッション10の突部10bを乗員の進入時における上記合力の方向に延在するように設けたため、クッション10の挙動の安定に必要であるインストルメントパネル面からの反力(抗力)を必要最小限にすることができると共に、頭部進入によるクッションの垂れ下がり、つまりエアバッグ装置の取付部を中心とし、取付部と頭部接触部間を半径とする円の接線方向に垂れ下がろうとするのを抑え、安定した衝撃吸収時の挙動を得ることができる。
Claims (6)
- クッションと、前記クッション内にガスを供給するインフレータとを備えたインストルメントパネルに設置された助手席用エアバッグ装置であって、
展開膨張状態におけるクッションのインストルメントパネル側に乗員が進入する際の支持手段となる突部を備えることを特徴とする助手席用エアバッグ装置。 - 請求項1に記載された助手席用エアバッグ装置において、
前記突部の少なくとも一方に隣接する窪みを形成したことを特徴とする助手席用エアバッグ装置。 - 請求項1または2に記載された助手席用エアバッグ装置において、
前記突部は、助手席用エアバッグ装置の膨張展開時におけるクッションに作用する重力と進入する乗員による進入力との合力の方向に延在することを特徴とする助手席用エアバッグ装置。 - 請求項1ないし3のいずれかに記載された助手席用エアバッグ装置において、
乗員に対向する対向面を備えたメインパネルと、メインパネルの両側縁に接合された左右のサイドパネルとから成ることを特徴とする助手席用エアバッグ装置。 - 請求項1ないし4のいずれかに記載された助手席用エアバッグ装置において、
助手席用エアバッグ装置はインストルメントパネル上面に設置されており、
膨張展開時にウインドシールドとインストルメントパネル上面間の空隙を埋める部分が、前記空隙に対応した形状に形成されていることを特徴とする助手席用エアバッグ装置。 - 請求項4又は5に記載された助手席用エアバッグ装置において、
前記突部はメインパネルを構成するパネルの端部同士を接合して形成されていることを特徴とする助手席用エアバッグ装置。
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JP6224915B2 (ja) * | 2013-05-20 | 2017-11-01 | タカタ株式会社 | エアバッグ及びエアバッグ装置 |
TWI499193B (zh) * | 2013-08-16 | 2015-09-01 | Univ Nat Cheng Kung | 電力轉換裝置及其控制方法 |
US10682977B2 (en) * | 2015-01-29 | 2020-06-16 | Autoliv Development Ab | Air bag device |
KR102589936B1 (ko) * | 2020-12-01 | 2023-10-17 | 현대모비스 주식회사 | 차량용 에어백 쿠션 |
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