JPH10291454A - Air bag device for passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a deployed air bag door from being curved without increasing the inertial mass of the air bag door. SOLUTION: A pair of recessed grooves 62, 64 opened at both end sections are formed on the rear end side of the door base material 46 of an air bag door. An air bag door deployment angle regulating strap 74 made of one cord is inserted into the recessed grooves 62, 64 in the parallel sewn state, and the door base material 46 and an air bag case 26 are connected by it. The door base material 46 is not required to be specially reinforced, the inertial mass is not increased, the bag swelling pressure is distributed on both sides of the air bag door, the action distribution of the swelling pressure is averaged, and the deployed air bag door can be prevented from being curved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag door which is disposed at the top of a passenger seat side of an instrument panel so as to be deployable in opposition to a windshield glass, an inflator and a bag which are supported by a vehicle body side component member. Passenger seat, comprising: an airbag case for housing the airbag door; and an elongate restricting means for connecting the airbag door to the airbag case or the vehicle body-side component to restrict the deployment angle of the airbag door. The present invention relates to an airbag device.

[0002]

2. Description of the Related Art In a so-called top dash type airbag device for a passenger seat, an airbag door is normally deployed in a single-opening manner toward a windshield glass side. For this reason, it has already been proposed to use a strap in order to minimize interference between the airbag door and the windshield glass. Patent No. 250 is disclosed as an example of this type of structure.
No. 9277, which is briefly described below.

[0003] As shown in FIGS. 8 and 9, an airbag device 150 for a passenger seat is provided with an instrument panel 1.
52, an airbag unit 154 supported on the vehicle body side, and an airbag door 158 fixed to the airbag unit 154 with rivets 156 to close the airbag unit 154.
And is configured.

The airbag unit 154 includes a tray-shaped airbag case 160, in which an inflator 162 and a folded bag 164 are accommodated. A hinge 166 formed by thinning is provided on the front end side of the rear surface of the airbag door 158, and the airbag door 158 is further provided on the rear end side and both side portions of the rear surface with the windshield glass. 1
A substantially U-shaped broken portion 1 for unfolding to the 68 side
70 are formed.

Further, a reinforcing mesh 172 is embedded in the airbag door 158 by insert molding.
In the vicinity of the front end side, an intermediate portion of a band-shaped strap 174 is sewn substantially along the vehicle width direction. This strap 1
Both ends of 74 are bolted to the flange of airbag case 160 via retainer 176.

According to the above configuration, when a predetermined high load acts on the front portion of the vehicle, gas is blown from the inflator 162 and the bag 164 is inflated. For this reason, the airbag door 158 is broken along the break portion 170 by the inflation pressure of the bag 164 and is deployed toward the windshield glass 168 around the hinge 166. At this time, the strap 174 is extended in accordance with the operation of deploying the airbag door 158, whereby the airbag door 1
The deployment angle of 58 is regulated. As a result, interference between the airbag door 158 and the windshield glass 168 can be prevented.

[0007]

However, in the case of the above configuration, since the band-shaped strap 174 is buried by insert molding substantially along the vehicle width direction of the airbag door 158, the belt-shaped strap 174 is provided at a longitudinally intermediate portion of the strap 174. Bag inflation pressure works best. For this reason, the shape of the airbag door 158 after deployment becomes a curved shape. Therefore, the intermediate portion of the curved airbag door 158 in the vehicle width direction projects most toward the windshield glass 168 and approaches.

In order to suppress the amount of protrusion, a special rib or the like is set on the airbag door 158 to set the airbag door 1 to a predetermined position.
It is necessary to take measures such as hindering easiness of bending by increasing the rigidity of 58. In this case, there is a disadvantage that the airbag door 158 becomes thicker as a whole and the inertia mass increases.

In view of the above, it is an object of the present invention to provide an airbag device for a passenger seat which can prevent the deployed airbag door from being bent without increasing the inertial mass of the airbag door. It is.

[0010]

According to a first aspect of the present invention, there is provided an airbag door which is disposed at the top of a passenger seat side of an instrument panel so as to be deployable in opposition to a windshield glass and a vehicle body side component member. An inflator that is supported and disposed below the airbag door and that blows out gas when a predetermined high load is applied to the front of the vehicle, and a bag that is inflated by this gas and deploys the airbag door to the windshield glass side. An airbag case to be housed, and a long restricting means for connecting the airbag door and the airbag case or the vehicle body side component, and restricting the deployment angle of the airbag door to a predetermined angle in relation to the windshield glass; The airbag device for a passenger seat, comprising, on the rear end side of the door base material constituting the lower surface side of the airbag door, Was inserted to the parallel stitch pattern along the braking means in a substantially vehicle width direction, it is characterized in that.

According to a second aspect of the present invention, there is provided an airbag device for a passenger seat according to the first aspect of the present invention, wherein the regulating means is formed of a resin string.

According to a third aspect of the present invention, there is provided the airbag device for a passenger seat according to the first or second aspect of the present invention, wherein the airbag device is provided on the upper surface side of the door base material on the insertion locus of the regulating means. A plurality of grooves formed with the vehicle width direction as the longitudinal direction and provided with insertion holes at both ends are provided, and the groove is closed with a lid member in a state in which the regulating means is accommodated in the groove. It is characterized by:

According to a fourth aspect of the present invention, there is provided an airbag device for a passenger seat according to the third aspect of the present invention, wherein the instrument panel includes an instrument panel base material forming a lower surface thereof, and an instrument panel base material. And a foam layer filled between the instrument panel base material and the skin, and the airbag door comprises the door base. Material, a skin that is arranged separately from the door base material and constitutes a design surface, and a foam layer that is filled between the door base material and the skin, and is configured by three layers. An airbag door is formed integrally with the instrument panel.

According to the first aspect of the present invention, when a predetermined high load acts on the front portion of the vehicle, gas is blown from the inflator housed in the airbag case. Therefore, the bag is inflated and the airbag door is deployed toward the windshield glass. At this time, the deployment angle of the airbag door is controlled by the elongated regulating means connecting the airbag door and the airbag case or the vehicle-side component supporting the airbag case. At a predetermined angle. Thereby, interference between the airbag door and the windshield glass is prevented as much as possible.

Here, in the present invention, the regulating means is inserted into the rear end side of the door base material constituting the lower surface side of the airbag door in a side-by-side sewing substantially along the vehicle width direction. A plurality of portions passed through the upper surface side of the base material are formed. For this reason, the bag inflation pressure acts on each of the plurality of portions passed through the upper surface. That is, according to the present invention, the distribution of action of the bag inflation pressure on the airbag door can be leveled.

In addition, since the above-described effect is obtained by the way of passing the restricting means, it is not necessary to set a special rib or the like on the airbag door to increase the rigidity of the airbag door as in the conventional structure. Therefore, the airbag door does not become thick as a whole.

According to the second aspect of the present invention, since the restricting means is constituted by the resin cord, if the resin material to be used is appropriately selected, the restricting means which is advantageous in strength can be obtained.

According to the third aspect of the present invention, a plurality of longitudinally extending vehicle width directions are provided on the upper surface side of the door base material on the insertion trajectory of the regulating means, and insertion holes are provided at both ends. Since the groove is provided and the groove is closed with the lid in a state where the regulating means is accommodated in the groove,
The regulating means can be accommodated in the rear end side of the door base material with good fit.

According to the fourth aspect of the present invention, the instrument panel is provided with an instrument panel base material constituting the lower surface side thereof, and an outer skin constituting a design surface which is arranged separately from the instrument panel base material, A foam layer filled between the instrument panel base material and the epidermis, and composed of three layers,
A three-layer airbag door comprising: a door base material; a skin that is spaced apart from the door base material to form a design surface; and a foam layer that is filled between the door base material and the skin. In addition, since the airbag door is formed integrally with the instrument panel, the following effects can be obtained.

That is, since the lid member is interposed between the regulating means housed in the concave groove of the door base material and the foam layer, the regulating means is protected from the influence of the constituent material of the foam layer due to aging. Can be. In addition, since the difference in plate thickness between the portion where the control means is provided on the door base material and the general portion can be suppressed, the influence (sinking or bulging) on the skin constituting the design surface of the airbag door is exerted. Can be prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 is an external perspective view of a portion of the instrument panel 10 on the passenger seat side, and FIG. 3 is an airbag for a passenger seat described later provided on the passenger seat portion. The longitudinal section of the device 18 is shown.

As shown in these figures, an instrument panel 10 is disposed on the vehicle interior side and is provided with an instrument panel skin 12 made of a soft resin material and a predetermined distance from the instrument panel skin 12. Instrument panel base material 14 arranged and made of a hard resin material,
A urethane foamed foam layer 16 filled between the instrument panel skin 12 and the instrument panel substrate 14.

On the other hand, the passenger airbag device 18 includes an airbag door 20 disposed at the top of the instrument panel 10 on the passenger seat side, and the airbag door 20.
And a main body 22 disposed on the back side of the main body.

More specifically, a substantially rectangular opening 24 is provided at a predetermined position on the passenger seat side of the instrument panel base material 14.
The main body 22 is disposed substantially below the opening 24 on the vehicle side. The main body 22 includes a front wall 26
A, rear wall 26B, pair of side walls 26C, and bottom wall 2
A metal airbag case 26 formed in a substantially box shape by 6D is provided. A pair of mounting brackets 30 each having a central portion formed with a bolt insertion hole are fixed to both sides on the back surface of the bottom wall portion 26D of the airbag case 26. Correspondingly, a pair of mounting brackets 34 to which weld nuts 33 are welded are formed on the high-strength instrument panel reinforcement 32 arranged on the inner side of the instrument panel 10 with the longitudinal direction substantially in the vehicle width direction. ing. Then, the mounting bracket 30 on the airbag case 26 side is made to correspond to the mounting bracket 34 on the instrument panel reinforcement 32 side, and the fixing bolt 36 is screwed into the weld nut 33.
Are fixed to the instrument panel reinforcement 32.

A substantially cylindrical inflator 38 is provided on the inside front side of the airbag case 26 described above. To briefly explain an example of the configuration of the inflator 38, a plurality of gas ejection holes (not shown) are formed in a peripheral wall portion of the inflator 38. Further, inside the inflator 38, a squib which is connected to a center control unit disposed below the console box and functions as an ignition device, an ignition material which is ignited when a predetermined current is supplied to the squib, and an ignition material There is a transmission material that propagates a flame to the gas generating agent when it is ignited, a gas generating agent that generates a large amount of gas by burning, a filter that removes debris of the gas generating agent after combustion, etc. Is housed. The center control unit is
Sensors (not shown) that are disposed on both sides of the front portion of the vehicle and detect a predetermined high load acting state on the front portion of the vehicle are connected.

A bag 40 folded in a predetermined manner (bellows fold, roll fold) is provided on the inner rear side of the airbag case 26. Note that the terminal portion of the bag 40 is fixed to the fixing device 5 via a narrow retainer 50.
2 is fixed to the upper end of the airbag case 26.
A diffuser 54 for rectifying gas ejected from the inflator 38 is provided between the inflator 38 and the bag 40.

On the other hand, as shown in FIG. 3, the airbag door 20 that closes the main body 22 of the passenger airbag device 18 is arranged to face the windshield glass 42. More specifically, the airbag door 20
When the door skin 44 is arranged on the vehicle interior side and is also a part of the instrument panel skin 12 (only the sign is changed for distinction), the door skin 44 is arranged at a predetermined distance from the door skin 44 and is made of hard resin. Door substrate 46 having a substantially rectangular shape
And a foam layer 48 which is filled between the door skin 44 and the door base material 46 and is also a part of the foam layer 16 of the instrument panel 10 (only the sign is changed for distinction). ing.

A step 46A is formed integrally with the periphery of the door base material 46 so as to descend substantially below the vehicle.
Correspondingly, a hook-shaped portion 14A is formed integrally with the periphery of the opening 24 of the instrument panel base material 14 so as to be hook-shaped upward. The step portion 46A and the hook-shaped portion 14A are in contact with each other, and the instrument panel skin 1
A cutout portion 56 having a U-shaped cross section that defines the door skin 2 and the door skin 44 is arranged. In addition, the epidermis cleavage portion 56 is formed in a substantially U shape in plan view.

At the front end of the door base material 46, a mounting portion 46B having a narrow width and a longitudinal direction substantially in the vehicle width direction is integrally formed. The mounting portion 46B abuts on the upper surface of the front edge of the opening 24 in the instrument panel base material 14, and is fixed to the front edge of the opening 24 by bolts 58 and nuts 60 in this state.

Here, as shown in FIGS. 1 and 4 to 6, a pair of the rear end side of the above-described door base material 46 is formed along the rear end edge (almost along the vehicle width direction). Groove 6
2, 64 are juxtaposed. Each of the concave grooves 62 and 64 is a concave groove lower part 62A, 64A and a concave groove upper part 62 which are vertically communicated.
B, 64B, and has an inverted "convex" cross-sectional shape (see FIGS. 5 and 6). In addition, the concave groove lower parts 62A, 64
The front end surfaces of A and the concave groove upper portions 62B, 64B are vertical surfaces orthogonal to the bottom surface, while the rear end surfaces are inclined surfaces inclined rearward with respect to the bottom surface. The portions of the door base material 46 where the grooves 62 and 64 are formed protrude substantially downward of the vehicle.

The lower part 6 of the groove in one groove 62
The first insertion hole 66 and the second insertion hole 68 each having a substantially elliptical shape penetrating the door base material 46 in the thickness direction at both ends in the longitudinal direction of the 2A.
(See FIG. 4). Similarly, the other groove 6
Also, substantially oval-shaped third insertion holes 70 and fourth insertion holes 72 are formed at both longitudinal ends of the concave groove lower portion 64A in FIG. The first through hole 66 through the fourth through hole 72 have a strap 74 made of a single polyester string.
Are inserted in a line-stitch pattern.

More specifically, the strap 74 is formed in a loop shape having a knot 74A at one place by aligning both ends of a single string of a predetermined diameter and rotating once. Then, first, this loop-shaped strap 74
Is located below between the pair of concave grooves 62, 64. Next, after passing the one end 74B of the strap 74 from the second insertion hole 68 of the one groove 62 to the upper surface side of the door base material 46, while being accommodated in parallel in the lower part 62A of the groove, It is pulled out from the first insertion hole 66 to the lower surface side of the door base material 46. Similarly, the other end 7 of the strap 74
4C from the third insertion hole 70 of the other groove 64 to the door base material 4.
After passing through the upper surface of the door base material 6, the door base material 46 is inserted through the fourth insertion hole 72 while being accommodated in the concave groove lower portion 64 </ b> A in two parallel directions.
To the bottom side of the As a result, as shown in FIG. 1, the strap 74 is formed in a line-stitched manner from the lower surface side of the door base material 46 to the upper surface side, from the upper surface side to the lower surface side, from the lower surface side to the upper surface side, and from the upper surface side to the lower surface side. Is inserted through.

As shown in FIGS. 1, 5 and 6, resin lids 76 and 78 are fitted into the respective grooves 62 and 64 with the strap 74 inserted as described above. As a result, the concave grooves 62 and 64 are closed.
As shown in FIG. 5, the lid members 76 and 78 include top plates 76A and 78A having a substantially rectangular flat plate shape, and first leg portions 76B and 78B extending parallel to each other from the back side of the top plates 76A and 78A. The second leg portions 76C and 78C are provided. Further, the front end surface shapes of the lid members 76 and 78 are concave grooves 62,
The shape of the rear end face conforms to the shape of the front end face of the groove 64 and the shape of the rear end face of the concave groove 62, 64. The distance between the first leg portions 76B and 78B and the second leg portions 76C and 78C is set to the length of two straps constituting the strap 74. Then, the strap 74 is inserted into the concave grooves 62, 64.
After the lids 76 and 78 are fitted in the state of being housed therein, the boundaries between the top plates 76A and 78A and the upper surface of the door base material 46 are thermally welded (the welded portions are denoted by reference numeral 80 [FIG. 5]. reference〕
).

Further, as shown in FIG. 1, metal support brackets 82 for locking both ends 74B and 74C of the strap 74 are provided on both side walls 26C of the airbag case 26 described above. Has been established. The support bracket 82 has a locking portion 82A formed in a substantially U-shape that opens downward, and a pair of coupling pieces 82B, 82 extending outward from the case from the open end side of the locking portion 82A.
C and a pair of rectangular mounting pieces 82D, 82E extending in directions away from each other from the upper front and rear ends of the locking portion 82A.
And is constituted by.

The support bracket 82 includes a pair of mounting pieces 82.
D and 82E are fixed to the side wall 26C of the airbag case 26 by spot welding. Further, bolt insertion holes are formed coaxially with the coupling pieces 82B and 82C facing vertically, and a weld nut 84 is previously welded to the upper surface of the coupling piece 82B located on the upper side. And both ends 74B, 74C of the strap 74
Through the gap between the coupling pieces 82B and 82C of the support bracket 82 provided correspondingly and into the locking portion 82A, and then the two coupling pieces 82B and 82C are brought into close contact with each other to form the bolt 86 Is screwed into the weld nut 84, whereby the airbag door 20 is connected to the airbag case 26 via the strap 74.

The support bracket 82 receives a load above the predetermined value (a value that can prevent the strap 74 from being cut, for example, a certain value slightly lower than the tensile strength of the strap 74) through the strap 74. Locking part 82A
, The strength is set such that the locking portion 82A is plastically deformed.

Next, the operation and effect of this embodiment will be described. When a predetermined high load acts on the front portion of the vehicle, that is, when the vehicle suddenly decelerates, the vehicle sudden deceleration state is detected by the sensor. As a result, a predetermined current is supplied from the center control unit to the squib of the inflator 38. For this reason, the inflator 38 operates, and gas is ejected from the gas ejection holes of the inflator 38.
As a result, gas flows into the bag 40, and the inflation pressure of the bag 40 causes the airbag door 20 to unfold open toward the windshield glass 42 side, and the bag 40 expands toward the passenger seat side. It is. At this time, the strap 74 connecting the airbag door 20 and the airbag case 26 is extended, whereby the deployment angle of the airbag door 20 is restricted. As a result, interference between the airbag door 20 and the windshield glass 42 is prevented.

Here, in this embodiment, the strap 74 is inserted in the rear end side of the door base material 46 constituting the lower surface side of the airbag door 20 in a line-stitched manner substantially along the vehicle width direction. At 74, a plurality of portions 74D and 74E passed through the upper surface side of the door base material 46 (that is, portions accommodated in the concave grooves 62 and 64) are formed. Therefore, the bag inflation pressure acts on each of the plurality of portions 74D and 74E passed through the upper surface. That is, as shown in the schematic diagram of FIG. 7, the bag inflation pressure F acts most on the middle portion of the airbag door 20 in the substantially vehicle width direction in the conventional structure, whereas according to the present embodiment, The bag inflation pressure f acts on both sides of the airbag door 20 in a distributed manner. Therefore, the distribution of the action of the bag inflation pressure on the airbag door 20 can be equalized. As a result, according to the present embodiment, it is possible to prevent the deployed airbag door 20 from being curved.

Further, since the above-mentioned functions and effects are obtained by the way of passing the strap 74, there is no need to increase the rigidity of the airbag door by setting a special rib or the like on the airbag door as in the conventional structure. Therefore, the airbag door 20 does not become thick as a whole. As a result, according to the present embodiment, an increase in the inertial mass of the airbag door 20 does not occur.

Further, according to the present embodiment, the strap 74 is constituted by a resin string, so that the strap 74 which is advantageous in strength can be obtained by appropriately selecting a resin material to be used. In consideration of this point, in the present embodiment,
Since the strap 74 is made of a polyester string, it is excellent in tensile strength, durability, heat resistance, and flexibility.

Further, according to the present embodiment, the door substrate 4
6 on the insertion locus of the strap 74 on the upper surface side, the longitudinal direction is substantially in the vehicle width direction, and the first
A groove 62 having an insertion hole 66 and a second insertion hole 68 and a groove 64 having a third insertion hole 70 and a fourth insertion hole 72 are provided, and the strap 74 is inserted into the groove lower portions 62A and 64A. Since the concave grooves 62 and 64 are closed by the lid members 76 and 78 in a state of being closely contacted and accommodated in parallel, the strap 74 can be fitted to the rear end side of the door base material 46 and fitted well. As a result, according to the present embodiment, it is possible to prevent the strap 74 from waving or meandering after the strap 74 is assembled to the door base material 46.

Further, according to the present embodiment, the instrument panel 10 is provided with an instrument panel substrate 14 constituting the lower surface thereof, and an instrument panel skin which is disposed separately from the instrument panel substrate 14 and constitutes a design surface. 12, a foam layer 16 filled between the instrument panel base material 14 and the instrument panel skin 12.
The airbag door 20 has a door base material 46 forming the lower surface side thereof, and a door skin 44 which is disposed apart from the door base material 46 and forms a design surface. And the foam layer 48 filled between the door base material 46 and the door skin 46, and the airbag door 20 is formed integrally with the instrument panel 10. The following actions and effects are obtained.

That is, the concave grooves 62, 64 of the door base material 46
Since the lid members 76 and 78 are interposed between the strap 74 and the foam layer 48 housed therein, the influence of the constituent material of the foam layer 48 due to aging [that is, the polyester yarn constituting the string is hydrolyzed (The so-called amine attack)], and the strap 74 can be protected.
As a result, according to the present embodiment, the aging of the strap 74 can be prevented.

Further, for the same reason, the difference in plate thickness between the portion where the strap 74 is provided on the door base material 46 and the general portion can be suppressed, so that the side of the door skin 44 constituting the design surface of the airbag door 20 can be reduced. Can be prevented from affecting (sinking and swelling). As a result, according to the present embodiment, the appearance quality of the airbag door 20 and thus the instrument panel 10 can be improved.

In addition, in this embodiment, since a predetermined interval is provided between the lid member 76 and the lid member 78 (that is, the lid member is divided into a plurality of parts),
When the airbag door 20 is deployed,
Can be followed, and the lid members 76 and 78 can be prevented from breaking and coming off. That is, if the lid member is formed in a single band plate shape, the relative displacement between the lid member and the airbag door becomes large when the airbag door is bent and deformed. Easily come off the door base material. On the other hand, in the present embodiment, the bending deformation of the airbag door 20 can be suppressed, and
Since the lid is divided into a pair of lids 76 and 78, even if the airbag door 20 is slightly curved and deformed, the relative displacement between the airbag door 20 and the lids 76 and 78 is reduced. Therefore, the lid members 76 and 78 can easily follow the curved deformation of the airbag door 20, and as a result, the lid members 76 and 78 can be prevented from breaking and coming off the door base material 46.

Further, in the present embodiment, the groove lower portion 62
A, 64A and the front end surfaces of the concave groove upper portions 62B, 64B are vertical surfaces orthogonal to the bottom surface, while the rear end surfaces are inclined surfaces rearwardly inclined with respect to the bottom surface.
Since the shape of the front end of the groove 78 matches the shape of the front end of the grooves 62, 64 and the shape of the rear end matches the shape of the rear end of the grooves 62, 64, the strap 74 and the lids 76, 7 are formed.
Good assembling operability into the concave grooves 62 and 64 of FIG. 8 can be secured.

Further, according to the present embodiment, the substantially U-shaped locking portion 82A that plastically deforms when a load equal to or more than a predetermined value is applied to both side walls 26C of the airbag case 26.
, And both ends 74B, 74C of a strap 74 formed of a loop-shaped string are attached to the locking portions 82A of both the support brackets 82.
Are connected to each other by the bolts 84 and the weld nuts 82, so that when the airbag door 20 is deployed by the inflation pressure, the ends 74B of the strap 74, A tensile load acts on the locking portion 82A of the support bracket 82 through which the 74C has passed. When the tensile load exceeds a predetermined value, the support bracket 82 is plastically deformed. Therefore, the tensile load is absorbed in the process of plastic deformation of the support bracket 82. As a result, according to the present embodiment, an effect is obtained that the strap 74 can be prevented from being cut.

In the present embodiment, the present invention is applied to the airbag door 20 that opens to the side of the windshield glass 42, and it seems that the case is most effective in that case. However, the present invention is not limited to this. The present invention may be applied to a double-opening type airbag door or a four-way opening type airbag door. Also in these cases, the deployed airbag door may interfere with the windshield glass depending on the arrangement position of the airbag door, the inclination angle and the radius of curvature of the windshield glass, etc. Makes the present invention meaningful. In this case, the object to which the strap is to be attached is a door portion that extends to the windshield glass side.

In this embodiment, the airbag door 2
The length of the strap 74 and the amount of plastic deformation of the locking portion 82A of the support bracket 82 are adjusted so that the rear end of the airbag door 20 does not interfere with the windshield glass 42 when the 0 is deployed. The length of the strap 74 and the length of the support bracket 82 are so set that the rear end of the airbag door 20 slightly interferes with the windshield glass 42 when the airbag door 20 is deployed. The amount of plastic deformation of the stopper 82A may be adjusted.

Also in this case, when the present invention is applied, since the inertial mass of the airbag door 20 does not increase, the contact load on the windshield glass 42 side is reduced, and the support bracket 82 Locking part 82A
Is plastically deformed, so that energy is further absorbed, so that the contact load on the windshield glass 42 side is further reduced. That is, in this specification, the description "to minimize the interference between the airbag door and the windshield glass" refers to the case where the airbag door is completely prevented from coming into contact with the windshield glass. Both include the case where the airbag door comes into contact with the windshield glass, provided that the contact load can be reduced.

Further, in the present embodiment, a configuration is adopted in which the airbag door 20 having the same three-layer structure is integrally formed with the instrument panel 10 having the three-layer structure. At this time, the door skin 44 and the instrument panel skin 12 are integrally formed. (That is, a so-called invisible type), but the invention is not limited thereto, and the door skin 44 and the instrument panel skin 12 may be divided.

Further, in the present embodiment, the present invention is applied to the airbag door 20 provided integrally with the instrument panel 10 having a three-layer structure. However, the present invention is not limited to this.
The present invention may be applied to a type in which an airbag door is attached separately from an instrument panel.

Further, in the present embodiment, support brackets 82 are provided on both side wall portions 26C of the airbag case 26, and the straps 74 are attached to the support brackets 82.
The two ends 74B and 74C are locked, but the invention is not limited to this, and the strap 74 is attached to the instrument panel reinforcement 32, which is a vehicle body-side component supporting the airbag case 26.
The ends 74B and 74C of the support bracket 8 directly or
A configuration may be adopted in which the locking is performed after the 2 is provided.

In the present embodiment, the strap 74 made of a polyester string is used.
A string or belt-shaped strap made of a flexible resin material having high tensile strength, excellent durability and heat resistance may be used.

Further, in the present embodiment, the lid members 76 and 78
Is thermally welded to the door base material 46, but the present invention is not limited to this, and a configuration may be adopted in which the lid member is attached to the concave groove using an engaging means such as a claw fitting.

Further, in the present embodiment, the concave grooves 62 and 64 are formed at two positions on the rear end side of the door base material 46. However, the present invention is not limited to this, and concave grooves may be formed at three or more positions.

Further, in the present embodiment, the strap 74
The knot 74A of the strap 74 is disposed below the pair of concave grooves 62 and 64, but is not limited thereto. The knot 74A of the strap 74 may be disposed on either one side of the pair of support brackets 82.

[0059]

As described above, the airbag device for a passenger seat according to the present invention according to the first aspect of the present invention has the airbag door deployed at the rear end side of the door base material constituting the lower surface side of the airbag door. Long-length regulating means that regulates the angle to a predetermined angle in relation to the windshield glass is inserted in a line-stitched manner substantially along the vehicle width direction, so that the distribution of bag inflation pressure applied to the airbag door is leveled. As a result, there is an excellent effect that it is possible to prevent the deployed airbag door from being curved.

Further, according to the present invention, since the airbag door does not become entirely thick due to the setting of the ribs and the like,
It has an excellent effect of not increasing the inertial mass of the airbag door.

According to a second aspect of the present invention, in the passenger airbag device according to the first aspect of the present invention, since the restricting means is constituted by a resin string, a high-strength restricting means is provided with a simple structure. It has an excellent effect that means can be obtained.

Further, according to the present invention, since the regulating means is constituted by the string made of resin, there is an excellent effect that the cost of the regulating means and, consequently, the airbag device for the passenger seat can be reduced.

According to a third aspect of the present invention, there is provided an airbag device for a passenger seat according to the first or second aspect of the present invention, wherein the vehicle is positioned substantially on the locus of the restricting means on the upper surface side of the door base material. Since a plurality of grooves having a width direction as a longitudinal direction and provided with insertion holes at both ends are provided, and the restricting means is accommodated in the groove, the groove is closed with a lid material. It is possible to fit the regulating means on the rear end side of the door base material and to assemble it well. As a result, it is possible to prevent the regulating means from waving or meandering after the restricting means is assembled to the door base material. Has excellent effects.

According to a fourth aspect of the present invention, there is provided an airbag device for a passenger seat according to the third aspect of the present invention, wherein the instrument panel is provided with an instrument panel base material constituting a lower surface thereof, and an instrument panel base material. The airbag door is formed of three layers consisting of a skin that is spaced apart from the skin and forms a design surface, and a foam layer filled between the instrument panel base material and the skin, and the airbag door includes a lower surface of the airbag door. A door base constituting the side, a skin constituting a design surface which is disposed separately from the door base, and a foam layer filled between the door base and the skin, by three layers comprising In addition, since the airbag door is formed integrally with the instrument panel, it is possible to prevent aging of the regulation means and to prevent the airbag door and, consequently, the external appearance of the instrument panel. It has an excellent effect that it is possible to improve the quality.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a strap is inserted into a door base material of a passenger seat airbag device according to the present embodiment in a line-stitched manner and an airbag door and an airbag case are connected.

FIG. 2 is an external perspective view of an airbag door-integrated instrument panel provided with a passenger airbag device according to the present embodiment.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, showing a longitudinal sectional structure of the airbag device for a passenger seat shown in FIG. 1;

FIG. 4 is a plan view of a single piece of the door base material shown in FIG. 1;

FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 1 showing a state in which a strap is accommodated in a concave groove of the door base material and a lid member is fitted.

FIG. 6 shows a cross-sectional structure between the two grooves in a state where the strap is inserted into the grooves in the door base material in FIG.
It is an expanded sectional view which follows a line.

FIG. 7 is an explanatory diagram for explaining an operation when the airbag door is deployed.

FIG. 8 is a longitudinal sectional view showing a state in which an airbag door of a conventional passenger airbag device is deployed.

9 is a cutaway perspective view of the airbag device for a passenger seat shown in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Instrument panel 12 Instrument panel skin 14 Instrument panel base material 16 Foam layer 18 Passenger-seat airbag device 20 Airbag door 26 Airbag case 32 Instrument panel reinforcement (Body side component member) 38 Inflator 40 Bag 42 Windshield glass 44 Door skin 46 Door base material 48 Foam layer 76 Strap (control means)

Claims (4)

[Claims] 1. An airbag door disposed at a top portion of a passenger seat side of an instrument panel so as to be deployable in opposition to a windshield glass, and is supported by a vehicle-side component member and disposed below the airbag door. An inflator for injecting gas when a predetermined high load is applied to a front portion of a vehicle, an airbag case for housing a bag for expanding the airbag door to the windshield glass side when inflated by the gas, an airbag door and an airbag A long restricting means for connecting the case or the vehicle body side component member and restricting the deployment angle of the airbag door to a predetermined angle in relation to the windshield glass; and a passenger airbag device comprising: A regulating means is stitched side by side along a substantially vehicle width direction on a rear end side of a door base material constituting a lower surface side of the airbag door. It was inserted into it a passenger airbag apparatus according to claim. 2. The airbag device for a passenger seat according to claim 1, wherein the restricting means is constituted by a resin string. 3. A plurality of grooves formed substantially in the vehicle width direction and having insertion holes at both ends are provided on the insertion locus of the regulating means on the upper surface side of the door base material. The passenger-seat airbag device according to claim 1 or 2, wherein the concave groove is closed by a lid member in a state where the restricting means is accommodated in the groove. 4. An instrument panel base material constituting the lower surface side of the instrument panel, a skin constituting a design surface spaced apart from the instrument panel base material, and a space between the instrument panel base material and the skin. The airbag door, the door base material, a skin that is disposed apart from the door base material and constitutes a design surface, and a door. The airbag door is formed integrally with the instrument panel by three layers composed of a foam layer filled between the base material and the skin, and the instrument panel is formed integrally with the instrument panel. Airbag device for passenger seat.