JP2003118527A - Air bag device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of the opening end surface of a fracture open part by improving pressure resistance against a pushing load to an interior panel cover and improving a bent portion constituting a hinge extension allowance of a reinforcing plate material to be fixed to the fracture open part. SOLUTION: This air bag for an automobile is provided with an air bag case 23 storing an air bag 22 in a folded state, the fracture open part 30 constituted in the interior panel cover 3 facing the opening 23a of the air bag case 23, the reinforcing plate material 25 having one end horizontal surface 25b, which is fixed to the rear surface of the fracture open part and has the bent portion 25a constituting the curved hinge extension allowance, and having the other end connected to the air bag case 23, and a frame body 24 having reinforcing edge portions 24b and 24c closely contacted from the rear surface in the position corresponding to the interior panel cover circumferential region of the fracture open part, having a square hole 24f for inserting and locking the bent portion 25a, and connected with the air bag case and the other end of the reinforcing plate material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle for protecting the occupants in the passenger seat, the driver's seat and the like from a frontal collision or a side collision during a collision of a vehicle such as an automobile to ensure safety. More particularly, the present invention relates to an improvement in a reinforcing structure for reinforcing a surface panel such as an interior panel cover which is broken when the airbag is inflated and deployed.

[0002]

2. Description of the Related Art Air bag devices for passenger seats, driver seats, left and right side pillars, etc. applied to vehicles such as automobiles are
Basically, an air bag, an air bag case that accommodates the air bag in a folded state, and an inflator that inflates and deploys the air bag, and the air bag device is arranged inside a vehicle interior panel cover. It has become. The interior panel cover of an automobile is generally composed of an instrument cover made of synthetic resin such as polypropylene that covers the surface of a panel core integrally formed of synthetic resin material such as polypropylene.

The conventional passenger airbag device is provided with an airbag case for accommodating an airbag which is inflated and expanded by gas from an inflator in a folded state, and is internally installed so as to face the opening of the airbag case. The opening formed in the panel cover is equipped with an open lid that is molded separately from the interior panel cover and is made of flexible synthetic resin. This open / close lid is used when the airbag is inflated and deployed. The central lid and the peripheral groove formed on the inner surface of the open lid disposed so as to face the opening of the open lid are ruptured and opened in a double door open state, and the airbag is projected and inflated from the ruptured opening.

Further, there has conventionally been provided a seamless type airbag apparatus for a passenger seat, as shown in FIGS. 1 and 2, in which a fracture groove at a fracture opening portion is hard to see. That is, in FIG. 1 and FIG. 2, the interior panel cover 3 is provided with a pulsed laser generated from a laser generating means (not shown).
By irradiating the back surface of the interior panel cover 3 while moving relatively along the outer edges of the pair of reinforcing plate members 10, 10 fixed to the back surface of the interior panel cover 3, the back surface of the interior panel cover 3 is exposed. Longitudinal front and rear hinge grooves 30a and a central break groove 3 formed in a direction perpendicular to each other.
By providing the breaking groove 30c in the direction 0b and the short length direction, the breaking open portion 30 for inflating and expanding the airbag corresponding to the size of the opening 5a of the airbag case 5 is formed. Further, the breaking open portion 30 has a central breaking groove 30b and a short breaking groove 3 which are formed in the longitudinal direction and the direction perpendicular thereto.
By 0c, the front and rear break open portions 31 and 32 become the front and rear hinge grooves 3 when the airbag is inflated and deployed, respectively.
It is configured such that the opening is opened through the opening 0a in the double-door state.

A break open portion 30 of the interior panel cover 3
When the airbag is released by the deployment pressure of the airbag 4 during inflation and deployment, the front and rear hinge grooves 30a may be separated from the interior panel cover 3. Therefore, one end horizontal portions of the pair of reinforcing plate members 10, 10 are fixed to the back surface of the breakage opening portion 30 of the interior panel cover 3 by means such as welding, and the other end portions 10 thereof are
a and 10a are bent and hung down via the hinges 11 and 11, and the other ends 10a and 10a have inner circumferences slightly larger than the outer circumferences of the opening 5a of the airbag case 5. In addition to the front and rear walls of the frame-shaped reinforcing rib 12 integrally formed on the back surface of the interior panel cover 3, the hook portions 36 attached to the front and rear wall surfaces 5b, 5b of the case 5 are engaged with each other. As a result, when the airbag is inflated and deployed, the break open portion 30 of the interior panel cover 3 that is opened in a double door is prevented from scattering,
The above-mentioned conventional air bag device for an automobile provided with an open lid having a separate structure is improved in appearance and design. The other ends 1 of the pair of reinforcing plate members 10, 10 are arranged so as not to hinder the opening of the front and rear break open portions 31, 32.
The hook locking holes 10b, 10b of 0a, 10a are set to be large, and the front and rear break open portions 31, 32 are opened, and the other ends 10a, 10a can be moved upward. It is designed to absorb the deployment pressure when the airbag is deployed. 13 is the pair of reinforcing ribs 1
2 is a thin portion formed in the back surface connecting portion of the interior panel cover 3 for preventing sink marks from being easily generated on the front surface side when the interior panel cover 3 is molded.

In the air bag device for an automobile constructed as described above, when a vehicle collides, the impact force at the time of the collision is detected by a sensor, and the impact force detected by this sensor is a predetermined value. Whether or not the above is reached is determined by a control device such as a CPU, and when it is determined that the value is greater than or equal to a set value, the inflator is operated by a signal output from the control device to generate a predetermined gas, and this gas is used as an air bag To rapidly inflate and deploy the air bag. That is, when the break opening portion 30 of the interior panel cover 3 is pressed from the inside by the pressure due to the inflation and deployment of the airbag, the break groove 30 of the break opening portion 30.
b and 30c are ruptured, and are expanded to the double-door open state through the front and rear hinge grooves 30a. Then, the front and rear break-opening portions 31 and 32, which have been expanded to the double door open state, are formed on the respective reinforcing plate members 1.
The expansion is reinforced by the hinge portions 11 of 0 and 10, respectively. At the same time, the air bag 4 is inflated and expanded from the opened rupture opening 30 to the outside of the interior panel cover 3, and the cushioning action of the inflated and expanded air bag 4 causes the head or chest of the passenger in the passenger seat. By supporting
The occupants are protected from the impact of a vehicle collision.

[0007]

By the way, in the above-mentioned device, the reinforcing plate members 10, 1 are provided on the lower back surface of the peripheral edge of the opening where the breaking open portion 30 of the interior panel cover 3 is provided.
0 and the reinforcing ribs 12 are provided, the reinforcing plate members 10 and 10 and the reinforcing ribs 12 are hooks because of the ease of assembling the airbag case 5 and the ease of opening the front and rear break open portions 31 and 32. There is looseness in the vertical direction for engagement with the portion 36, and there is no structure for supporting the pressing force from the upper surface of the interior panel cover 3, that is, the front surface side. When hung, front and rear hinge groove 30a
There is also a problem in that the central break groove 30b and the break groove 30c are broken, and the break open portion 30 is dented or the peripheral edge of the opening is deformed, thereby impairing the appearance of the interior panel cover. Further, the break open portion 30 of the interior panel cover 3 is configured by forming a central break groove 30b and a break groove 30c that penetrate through the interior panel cover 3 at a right angle from the back surface side to the front surface side. On the back surface of 30, a pair of reinforcing plate members 10 extending in the front-rear direction of the fracture opening portion 30 with the central fracture groove 30b interposed therebetween,
10 is fixed by welding, and further, the fracture groove 30
Since the reinforcing plate materials 10 and 10 and the reinforcing ribs 12 are formed with the c sandwiched therebetween, when the airbag is inflated and deployed, the fractured portions of the fractured grooves 30b and 30c of the fractured open portion 30 are smoothly expanded to a fractured shape. Although there is no inconvenience such as forming a sharp edge due to a fracture surface that causes a problem, for example, a jagged edge, in the case of a large apparatus having a large airbag inflation output, it is welded to the back surface of the fracture opening portion 30. Hinge portions 11, 11 of the reinforcing plate members 10, 10
Since the push-up deployment pressure is applied to the hinge portions 11, 11, the hinge portions 11, 11 are fully extended, and the breaking open portion 30 corresponding to the hinge portions 11, 11 is formed.
In the initial stage of expansion and expansion of the opening edge of, the center of the hinge is pushed up to bend the hinge line, making it difficult to bend the break open part, or the welded part with the reinforcing plate material 10, 10 welded to the back surface of the break open part 30. In addition, there is a problem in that the hinge part is pushed outward to the outside of the opening edge in the latter half of the expansion, so that the opening edge spreads and cracks or a sharp edge occurs.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to break a front panel that covers an inner front portion, a side pillar portion, a central portion of a steering wheel and the like of a vehicle. It is possible to improve pressure resistance against an external pressing load in the vicinity of the open part and its outer peripheral edge, facilitate assembly of various parts including the air bag case to the back surface of the interior panel cover, and spread the break opening and crack, It is an object of the present invention to provide an automobile air bag device in which a sharp edge is less likely to occur on a fracture surface and at the same time, removal of an air bag component or the like when a vehicle is scrapped, particularly an inflator which becomes an industrial waste is easily removed.

[0009]

In order to achieve the above object, the invention according to claim 1 of the present invention protects an occupant in a vehicle from an impact by inflating and deploying an air bag at the time of collision of a vehicle such as an automobile. And an airbag device for an automobile for ensuring safety, wherein the airbag is disposed on the back side of an interior panel cover provided in the vehicle compartment and is inflated and deployed by gas from an inflator. An air bag case that is stored in a folded state, and a break opening that is formed by forming a break groove that defines an opening shape for expanding the air bag on the back surface of the interior panel cover that faces the opening of the air bag case. Part and a horizontal portion of one end fixed to the back surface of the fracture opening portion in order to reinforce the fracture opening portion, and form a curved hinge extension margin. A reinforcing plate member having a curved portion, the other end of which is adapted to be connected to the airbag case, and a reinforcing edge portion which comes into close contact with the rear surface at a position corresponding to the interior panel cover peripheral region of the breaking open portion. Together with a frame body having a plurality of square holes into which the bent portion is inserted and locked, and a frame body that is coupled together with the other end of the airbag case and the reinforcing plate member, the breakage opening portion of the interior panel cover is When the airbag is displaced from the closed state to a state in which the airbag can be inflated and deployed, the expansion deformation of the reinforcing plate material at the hinge expansion margin is restrained in the first half of the deployment.

According to a second aspect of the present invention, in the automobile airbag device according to the first aspect, the frame body has a reinforcing edge portion formed by bending so as to face the back surface of the interior panel cover. It is characterized in that the reinforcing edge portion is in close contact with the back surface of the interior panel cover so that the reinforcing edge portion is located at the entire outer peripheral edge of the opening of the fracture opening portion.

According to a third aspect of the present invention, in the automobile airbag device according to the second aspect, the reinforcing edge portion is brought into contact with the back surface of the interior panel cover, and a plurality of through holes are formed in the reinforcing edge portion. It is configured to fix the frame body to the outer peripheral edge of the opening of the breakage opening portion of the interior panel cover by inserting, melting and crushing a welding piece protruding from the back surface of the interior panel cover. .

The invention according to claim 4 is the air bag for an automobile according to any one of claims 1 to 3,
The frame body and the reinforcing plate member and the airbag case are configured to be separably coupled to each other.

According to a fifth aspect of the present invention, in the automobile air bag device according to any one of the first to fourth aspects, a plurality of through holes are formed in a surface of each of the reinforcing plate members corresponding to the fracture open portion. The reinforcing plate member is fixed to the break-opening portion by inserting the welding piece protruding from the back surface of the break-opening portion into the through hole, melting and crushing the piece.

According to a sixth aspect of the present invention, in the automobile air bag device according to the first or fifth aspect, a slit for absorbing a difference in thermal expansion between the reinforcing plate member and the interior panel cover is formed in the reinforcing plate member. Is characterized by.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a longitudinal cross-sectional view of a main part when the automobile air bag device according to the present invention is applied to a passenger seat, and FIG. 4 is an embodiment when the automobile air bag device according to the present invention is applied to a passenger seat. 5 is an exploded perspective view of a main part showing FIG. 5, FIG. 5 is a partially cutaway perspective view of the state where the frame body and the reinforcing plate material portion in FIG. 4 are assembled, and FIG. 6 is an enlarged perspective view of an arrow B portion in FIG. FIG. 8 is an explanatory cross-sectional view showing an operating state of an automobile air bag device.

In FIG. 3, reference numeral 3 denotes a resin-made instrument panel cover (hereinafter referred to as an interior panel cover) integrally molded of a synthetic resin material such as polypropylene. The interior panel cover 3 is fixed to a vehicle body (not shown). Alternatively, it is configured to cover the surface of an instrument panel core (not shown) made of synthetic resin, and is fixed to the instrument panel core by an appropriate means such as a tapping screw.

The left side portion of the interior panel cover 3 is shown in FIG.
As shown in FIG. 3, a housing portion 21 for housing the automobile airbag device 20 is formed. In the case of a left-hand drive vehicle, it is provided on the right side opposite to the above configuration.
The automobile air bag device 20 includes an air bag 22 that is inflated and expanded by gas from an inflator, and an air bag case that accommodates the air bag 22 in a folded state (corresponding to an air bag support in claims). ) 23, a frame 24 made of metal, and a pair of reinforcing plate members 25, 25 for reinforcing the breaking open portion made of metal and having an L-shaped cross section from the back surface side.

At the location of the interior panel cover 3 facing the accommodation portion 21, there is formed a breaking open portion 30 which is opened by breaking when the air bag 22 is inflated and deployed.
The breaking open portion 30 includes a hinge groove 30a provided along the left-right longitudinal direction of the rear surface of the interior panel cover 3 and a side breaking groove 30c provided along the front-rear short direction and the opening 23a of the airbag case 23. It is configured by forming into the same rectangular shape by laser processing or the like, and is in the short direction of the fracture opening portion 30, that is, the side fracture groove 3.
In the middle of 0c, a central breaking groove 30b extending over the entire length in the longitudinal direction of the breaking opening portion 30 is formed by laser processing or the like, and the breaking opening portion 30 is used for side breaking when the air bag 22 is inflated and deployed. By breaking from the groove 30c and the central breaking groove 30b, the breaking open portions before and after being developed into the double door open state via the hinges 33, 33 configured by the hinge groove 30a as shown in FIG. 31, 32
It is designed to be separated into.

As shown in FIG. 4, the frame 24 has a rectangular prismatic shape having four sidewalls corresponding to the hinge groove 30a and the breaking groove 30c forming the rectangular breaking open portion 30. Has been done. And the frame 24
Is attached from the back surface side of the interior panel cover 3 to the peripheral region of the break opening part 30, and holds the airbag case 23 at a position where the opening 23a faces the break opening part 30. Further, the frame body 24 is arranged between the back surface of the interior panel cover 3 and the air bag case 23, and preferably has a rectangular vertical cylinder body 24a formed of a metal material, and is formed on four sides of the upper opening end. Are provided with reinforcing edge portions 24b and 24c that are bent outward at substantially right angles, respectively.
Reference characters b and 24c correspond to the back surface of the interior panel cover 3 in the peripheral region of the breaking open portion 30. In addition, the reinforcing edge portion 24
In order to fix the back surface of the interior panel cover 3, b and 24c are formed with through holes 24d through which the welding pieces 3a protruding from the back surface of the interior panel cover 3 penetrate.
The frame body 24 is fixed to the back surface of the interior panel cover 3 by penetrating a and then melting. Furthermore, on the side wall surfaces 24e, 24e in the longitudinal direction of the cylinder body 24a of the frame body 24, a plurality of corners into which the bent portions 25a of the reinforcing plate 25, which are curved and constitute the hinge extension margin, are fitted. The holes 24f are formed at regular intervals, and outwardly bent mounting pieces 24g are formed at the lower ends of the side wall surfaces 24e, 24e.

At the front and rear long side opening edge portions of the frame body 24 facing the back surface of the interior panel cover 3, one end of the reinforcing plate members 25, 25 corresponding to the front and rear break open portions 31, 32 is provided. Each horizontal surface 25b, 25b is provided via a bent portion 25a, 25a forming a plurality of hinge expansion margins, and the other vertical surfaces 25c, 25c are inner side surfaces of the side wall surfaces 24e, 24e of the frame body 24a. Connecting pieces 25 which are respectively arranged so as to contact the
It is adapted to be coupled with d through each mounting hole. As shown in FIG. 3, the reinforcing plate members 25, 25 are closed from the interior panel cover 3 side opening of the frame body 24 through the bent portion 25a serving as a hinge expansion allowance, and the airbag 22 is opened as shown in FIG. Are connected so that they can be expanded and deployed. Horizontal surface 25b of the reinforcing plate 25
Is a reinforcing plate member 25 that reinforces the fracture opening portion 30, and is preferably made of a metal material. The reinforcing plate members 25, 25 have horizontal surfaces 25b, 2b of the reinforcing plate member 25, respectively.
A large number of through holes 25e for welding 5b to the back surfaces of the corresponding break open portions 31 and 32 are formed over the entire area. Therefore, the horizontal surfaces 25b, 25b of the reinforcing plate 25
Is fixed to the back surface of the break open parts 31, 32, the break open parts 31, 3 are formed in the through holes 25e of the horizontal surfaces 25b, 25b.
It is carried out by inserting and melting the integrally formed welding pieces 31A and 32A provided on the back surface of No. 2 and crushing.

Further, on the horizontal surfaces 25b, 25b of the reinforcing plate members 25, 25, slits 2 formed in the short direction thereof are formed.
5f and 25f are horizontal surfaces 25b and 2 of the reinforcing plate members 25 and 25.
A plurality of strips are formed in the longitudinal direction of 5b, separated by a predetermined distance. The slits 25f and 25f absorb the difference in thermal expansion between the horizontal surface 25b of the reinforcing plate member 25 and the break-opening portions 31 and 32, whereby the reinforcing plate members 25 and 25 and the break-opening portion 3 are absorbed.
The resin welding pieces 31A and 32A to which 1 and 32 are fixed are prevented from being broken due to the difference in thermal expansion between the metal reinforcing plate members 25 and 25. Further, by making it easier for the reinforcing plate members 25, 25 to follow the deformation of the break open portions 31, 32 when the airbag is inflated and deployed,
The resin welded pieces 31A and 32A are prevented from being broken, and the break open portions 31 and 32 are smoothly developed.

Below the frame 24, the air bag 22 is provided.
Is provided with an air bag case 23, and a mounting piece 23b is provided at the case upper end opening 23a.
Together with the attachment piece 24e of the frame body 24 and the joining piece 25d of the reinforcing plate member 25, they are integrally joined by a fastening tool 26 such as a bolt or a nut. An inflator 27 that supplies gas to the air bag 22 is disposed at the lower end of the air bag case 23. Further, the air bag case 23 is fixed to a fixing member on the vehicle body side such as a cross member 29 via a support member 28 with a bolt nut 29a.
It is designed to be fixed by. In the airbag apparatus for the passenger seat according to the present embodiment configured as described above, when a vehicle such as an automobile collides, the impact force at the time of collision is detected by a well-known sensor (not shown), Whether or not the impact force detected by the sensor exceeds a predetermined value is determined by a control device including a well-known CPU (not shown), and a signal output from the control device when it is determined to be the set value or more, A well-known inflator (not shown) is operated to generate a predetermined gas, and this gas is supplied to the air bag 41 to rapidly inflate and deploy the air bag 22 (see FIGS. 7 and 8).

When the air bag 22 is inflated and deployed, when the pressure generated at the initial stage of the inflation and deployment of the air bag 22 is applied to the reinforcing plate members 25, 25, the breaking open of the reinforcing plates 25, 25 covered by the horizontal surfaces 25b, 25b. The parts 31 and 32 are formed from the fragile portion of the central breaking groove 30b to the lateral breaking groove 30b.
The horizontal portions 25b and 25b of the reinforcing plate members 25 and 25 including the front and rear fracture opening portions 31 and 32 are sequentially broken along the fragile portion of c and are bent portions 25a and 25a configured as hinge extension margins. As shown in FIG. 7, the bending portions 25a, 25a configured as hinge extension allowance absorb the initial pressure of the expansion, and the frame body of the bending portions 25a, 25a is expanded as shown in FIG. By being reinforced by the square holes 24f and the reinforcing edge portions 24a of 24, damage that occurs in the opening peripheral edge of the interior panel cover 3 can be prevented, and as shown in FIG.
In the present invention, the horizontal portions 25 of the reinforcing plate members 25, 25
Since the bent portions 25a and 25a, which are formed from the b and 25b as the hinge expansion margins, are configured to have a large hinge expansion margin, the influence on the opening peripheral edge of the interior panel cover 3 is reduced and the front, Rear break open part 3
1, 32 and horizontal portions 25b, 25b of the reinforcing plate members 25, 25
It is possible to eliminate the impact force that is applied to the welded part.

Furthermore, according to this embodiment, the front and rear and left and right peripheral regions of the break-opening portion 30 are reinforced edge portions 2 of the frame body 24.
Since it is welded to the 4b and 24c, it is suppressed to follow the opening operation of the breaking opening portion 30 and is quickly broken in the breaking groove 30c, and the breaking opening is broken when the air bag 22 is inflated and deployed. It is possible to prevent a sharp edge from being generated on the fracture surface of the portions 31 and 32 and to prevent a swelling phenomenon from occurring at the fracture portion, and to provide a safe fracture surface. further,
Since the peripheral region of the fracture opening 30 along the fracture groove 30a is reinforced by the reinforcing edge portions 24b and 24c of the frame body 24, against the pressing force from above the interior panel cover 3 including the fracture opening 30. The pressure resistance is increased, and the interior panel cover 3 can be prevented from being deformed such as cracked or distorted when the air bag device is not used.

Further, according to this embodiment, a plurality of slits 2 are provided on each horizontal surface 24b of the reinforcing plate members 25, 25.
Since 4f is formed, the slit 24f can absorb the difference in thermal expansion between the horizontal planes 25b and 25b of the reinforcing plate members 25 and 25 and the break open portions 31 and 32. Even if the horizontal surfaces 25b, 25b and the fracture opening portions 31, 32 are exposed to a high temperature, it is possible to prevent the resin welding pieces 31A, 32A that fix them from being destroyed. Further, since the air bag case 23 is configured to be separably connectable to the frame body 24 and the reinforcing plate member 25, the air bag case 23 is disposed when the vehicle is scrapped.
Can be easily removed from the frame 24, and related parts such as an inflator, which becomes industrial waste, can be easily separated and removed, and an adverse effect on the environment can be prevented. Further, in the above-described embodiment, the structure in which the break-opening part opens in the double door is described, but the structure is not limited to this, and the structure of the reinforcing plate material welded to the inner surface of the interior panel cover is slightly different, Needless to say, the present invention can also be applied to the case where the part has a single-opening structure.

The hinge groove 30 in the above embodiment is used.
Although the a and the breaking grooves 30b and 30c are formed by forming the fragile portion by laser processing from the back surface side of the interior panel cover, the invention is not limited to this, and may be formed by milling groove processing. Of course, when milling grooves, it is necessary to cut from the back side of the interior panel cover and leave the remaining thickness in the range of 0.5 mm to 0.8 mm on the front side of the interior panel cover. It is good to In addition, there is a method such as integral molding when molding the surface panel.

[0027]

As described above, according to the automobile air bag device of the first aspect, the frame with the reinforcing edge portion which reinforces the interior panel cover by closely adhering to the peripheral region of the fracture opening portion of the interior panel cover. Since the body and the reinforcing plate member are separately assembled, and the bent portion forming the hinge expansion margin of the reinforcing plate member is fitted into the square hole formed in the frame body with the reinforcing edge portion. Even if pressure is applied from the upper surface of the interior panel cover, the reinforcing edge of the frame body supports the area including the breaking groove and the hinge groove that regulate the breaking open portion from below, and the dent or the opening edge of the breaking open portion Can be prevented from being deformed. Further, by forming the bent portion of the hinge expansion margin to be large, at the initial stage of expansion and deployment, the load applied to the hinge portion is absorbed to restrain the deformation due to expansion, and the breaking open portion 30 is provided.
The peeling of the welded portion with the reinforcing plate materials 10 and 10 welded to the back surface of the opening is prevented, and the expansion crack and the fracture surface of the opening edge caused by the hinge portion being pushed out to the outside of the opening edge in the latter stage of the development. It is possible to prevent a sharp edge or blister phenomenon from occurring and to make a safe fracture surface.

According to the automobile air bag device of the second aspect, since the reinforcing edge portion of the frame body supports both the breaking open portion and the outer peripheral edge of the opening from below, the breaking open portion is more reliable. It is possible to prevent dents and deformation of the peripheral edge of the opening. According to the automobile air bag device of the third aspect, the reinforcing edge portion of the frame body is fixed to the outer peripheral edge of the opening of the breaking open portion. Without providing, to prevent the occurrence of a sharp edge in the fracture surface of the fracture open portion that was fractured when the airbag is inflated and deployed, or a blister phenomenon at the fracture portion, by reinforcing the opening peripheral edge of the fracture opening portion, Can provide a safe fracture surface.

According to the automobile air bag device of the fourth aspect, since the air bag support can be detachably coupled to the frame, the air bag support can be used when the vehicle is discarded. It can be easily removed from the body, and related parts such as the inflator can be easily separated and removed, which can prevent adverse effects on the environment. Further, according to the automobile air bag device of the present invention, since a plurality of slits are formed in the reinforcing plate material, it is possible to absorb the difference in thermal expansion between the reinforcing plate material and the break open portion due to the slits. Thus, even if the reinforcing plate member and the fracture opening are exposed to a high temperature atmosphere, it is possible to prevent the resin welded piece that fixes them from being destroyed.

[Brief description of drawings]

FIG. 1 is a partially enlarged explanatory view showing a state in which a break open portion for inflating and expanding an airbag is formed in an integrated interior panel cover of a conventional passenger airbag device.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view of a main part showing an embodiment in which an automobile airbag device according to the present invention is applied to a passenger seat.

FIG. 4 is an exploded perspective view of a frame body, a reinforcing plate member, and an airbag case portion in FIG.

FIG. 5 is a partially cutaway perspective view showing an assembled state of the frame body and the reinforcing plate member according to the present invention.

6 is an enlarged perspective view of an arrow B portion in FIG.

FIG. 7 is an explanatory cross-sectional view showing an operating state of an automobile airbag device.

FIG. 8 is an explanatory cross-sectional view showing an operating state of an automobile airbag device.

[Explanation of symbols]

2 Instrument panel core 3 Interior panel cover 30 Break open part 31, 32 Front and rear break open section 30a hinge groove 30b central fracture groove 30c Side break groove 31A, 32A welding piece 20 Airbag device for automobile 22 air bags 23 Air bag case (air bag support) 23a opening 23b Mounting piece 24 frame 24a frame body 24b, 24c Reinforcing edge 24d through hole 24g mounting piece 24f square hole 25 Reinforcement plate material 25b horizontal plane 25a Hinge Bending part that constitutes the expansion allowance 25c Vertical plane 25d connecting piece 25e through hole 25f slit

Claims (6)

[Claims] 1. An air bag device for a vehicle, for inflating and expanding an air bag at the time of a collision of a vehicle such as an automobile to protect an occupant in the vehicle from a shock, thereby ensuring safety, which is provided in a room of the vehicle. An air bag case, which is disposed on the back side of the provided interior panel cover and stores the air bag inflated and expanded by the gas from the inflator in a folded state, and the interior facing the opening of the air bag case. A rupture opening portion formed by forming a rupture groove that determines an opening shape for airbag deployment on the back surface of the panel cover, and a horizontal surface on the back surface of the rupture opening portion to reinforce the rupture opening portion. Reinforcement which is fixed and has a bent portion which forms a curved hinge extension margin, and the other end of which is connected to the airbag case A plate member and a reinforcing edge portion that comes into close contact with the interior panel cover peripheral region of the break-opening portion from the back surface thereof, and a plurality of square holes into which the bent portion is inserted and locked, and the air A hinge connected to the other end of the reinforcing plate member when the airbag is inflated and deployed from the closed state of the breakage opening of the interior panel cover. An automobile air bag device characterized by restraining expansion deformation during expansion in the first half of deployment. 2. The frame body has a reinforcing edge portion formed by bending so as to face the back surface of the interior panel cover, and the reinforcing edge portion is located at all of the outer peripheral edges of the opening of the breaking open portion. The air bag device for an automobile according to claim 1, wherein the air bag device is in close contact with the back surface of the interior panel cover. 3. The aforesaid reinforcing edge portion is brought into contact with the back surface of the interior panel cover, and a plurality of through holes formed in the reinforcing edge portion are inserted with the welding pieces protruding from the back surface of the interior panel cover to melt. The air bag device for an automobile according to claim 2, wherein the frame body is configured to be fixed to the outer peripheral edge of the opening of the breakage opening portion of the interior panel cover by crushing. 4. The automobile according to claim 1, wherein the frame body and the reinforcing plate member and the airbag case are configured to be separably coupled to each other. Air bag device. 5. A plurality of through holes are formed in a surface of each of the reinforcing plate members corresponding to the fracture open portion, and a welding piece protruding from the back surface of the fracture open portion is inserted into the through holes to melt and crush it. The air bag device for an automobile according to any one of claims 1 to 4, wherein each of the reinforcing plate members is fixed to the break open portion by the above method. 6. The automobile airbag device according to claim 1, wherein a slit for absorbing a difference in thermal expansion between the reinforcing plate member and the interior panel cover is formed in the reinforcing plate member.