JP3063753B1 - Airbag device for passenger seat - Google Patents

Abstract

A rupture operation along a rupture line of a rupture opening portion and a rotation operation of a reinforcing plate member during inflation and deployment of an airbag are smoothly performed without hindering the inflation and deployment of the airbag. SOLUTION: A reinforcing plate member 50 fixed to the back surface of an instrument panel cover 202, and a break line 60 is provided along the entire length of the outer periphery of the reinforcing plate member 50 at a position of the instrument panel cover 202 facing an outer peripheral edge of the reinforcing plate member 50. In the airbag device for the passenger seat having the break open portion 40 formed by forming the main hinge portion 501 and the sub hinge portion 5 on the reinforcing plate 50 supporting the break open portion 40,
02, the main hinge portion 501 and the sub hinge portion 50 are provided.
2 was configured to be sequentially bent in two stages by the inflation and deployment pressure of the air bag 33 applied to the break opening portion 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device for a passenger seat for protecting a passenger in a passenger seat from a collision in the event of a collision of a vehicle such as an automobile, thereby ensuring safety. When the airbag of the passenger-side airbag device installed inside is inflated and deployed outside the instrument panel to protect the occupant from collision, the airbag inflation formed on the cover of the instrument panel facing the airbag The present invention relates to a reinforcing plate material for reinforcing a breaking open portion for deployment and an improvement in a welding structure between the breaking open portion and the reinforcing plate material.

[0002]

2. Description of the Related Art An airbag device for a passenger seat applied to a vehicle such as an automobile basically has an airbag, an airbag case for accommodating the airbag in a folded state, and inflate and deploy the airbag. It has an inflator and is mounted on the inside of the instrument panel facing the passenger seat. An opening for airbag inflation deployment is formed in the cover of the instrument panel by making a perforated break line corresponding to the size of the opening of the airbag case. A metal reinforcing plate is integrally fixed to the inner wall of the opening, and a hinge provided on the reinforcing plate is connected to the instrument panel.

[0003] In the passenger-side airbag device configured 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 the sensor is set to a predetermined value. A control device including a CPU or the like determines whether or not the above has occurred. When the impact force is determined to be equal to or greater than the set value, the inflator is operated by a signal output from the control device to generate a predetermined gas. Is supplied to the airbag, whereby the airbag is rapidly inflated and deployed. That is, when the airbag is inflated and deployed, the opening portion of the instrument panel cover including the reinforcing plate is pressed from the inside by the deployment pressure, so that the opening portion is broken along the breaking line and separated from the instrument panel cover. At the same time, the separated opening is opened to the outside of the instrument panel cover with the hinge of the reinforcing plate as a fulcrum. At the same time, the airbag is further inflated and deployed from the opening formed by opening the opening to the outside of the instrument panel cover. By supporting the head, the occupant is protected from the impact force in the event of a vehicle collision.

An instrument panel of an automobile generally has an instrument panel core integrally formed of a synthetic resin material such as polypropylene, and an instrument panel made of a synthetic resin such as polypropylene which covers the surface of the instrument panel core. It consists of a panel cover. Hereinafter, a conventional reinforcing plate material of a break open portion will be described with reference to FIGS. FIG.
Is a perspective view of a break open portion formed on the instrument panel cover and a reinforcing plate member for reinforcing the break open portion from the inner surface, FIG. 2 is a cross-sectional view for explaining a main part before the airbag is inflated and deployed, and FIG. FIG. 3 is a cross-sectional view for explaining a main part when the bag is inflated and deployed.

[0005] In FIG. 1, a reinforcing plate 2 of a break open portion 1 is curved into a shape that matches the inner wall surface of the break open portion 1 and is formed in a substantially rectangular shape slightly smaller than the area of the break open portion 1. ing. A hinge 3 that is bent outward (in the direction of the arrow) as the airbag is inflated and deployed is formed at the upper end in the short direction of the reinforcing plate 2 so as to extend in the long direction of the reinforcing plate 2. The hinge portion 3 includes an intermediate portion 4 bent substantially perpendicularly to the rear side of the reinforcing plate 2 and a connecting portion 5 bent substantially perpendicularly upward from an edge of the intermediate portion 4. The base 6A of the support member 6 is fixed to the connecting portion 5 by bolts and nuts 7. The support member 6 has a pair of support pieces 6 </ b> B extending rearward on the back side of the reinforcing plate 2.
As shown in FIG. 2, the tip of B is fixed to the instrument panel cover 9 by tapping screws 8 so that the reinforcing plate 2 can be supported on the instrument panel cover 9. Also, the base 6 of the support member 6
A case support member 10 is fixed to A by bolts and nuts 7, and an airbag case 11 for accommodating an airbag (not shown) is fixed to the bolts and nuts 12 on the case support member 10.

The reinforcing plate 2 is provided with a plurality of reinforcing recesses 2A extending in the short direction thereof at intervals in the longitudinal direction of the reinforcing plate 2. Further, the reinforcing plate 2
A plurality of short holes are formed in the vertical direction and the horizontal direction in the vicinity of each other, and the plurality of the connection holes 2B are formed as a group. They are provided in an arrayed form.

On the inner wall surface of the instrument panel cover 9 of the break open portion 1, the same number of protrusions 1A as the arrangement of the coupling holes 2B of each group are formed corresponding to the arrangement of each group. After the ridge 1A is engaged with the coupling hole 2B, the protruding end projecting from the back surface of the reinforcing plate 2 is heated and melted and caulked, so that the reinforcing plate 2 is attached to the inner wall surface of the break open portion 1. It has a configuration that can be fixed integrally.

In the above configuration, when the airbag (not shown) is inflated and deployed, the reinforcing plate 2 is pressed from the inside by a strong force due to the deployment pressing force, so that the break open portion 1 of the instrument panel cover 9 is broken. 3 is separated from the instrument panel cover 9 along the line, and the hinge portion 3 of the reinforcing plate 2 is bent from the state shown in FIG. 2 to the state shown in FIG. 3, and at the same time, the case supporting member 10 is also shown in FIG. It is folded into a state. As a result, the broken open portion 1 is moved from the state shown in FIG.
The opening 9 </ b> A is formed in the instrument panel cover 9. Accordingly, the opening 9
The initial purpose can be achieved by further inflating and deploying the airbag (not shown) from the position A to the outside of the instrument panel cover 9.

[0009]

However, in the above-described conventional airbag device for a passenger seat, when the break open portion 1 of the instrument panel cover 9 is broken open from the break line due to the inflation and deployment of the airbag, it opens. Since the hinge 3 and the case supporting member 10 of the reinforcing plate 2 are bent as shown in FIG. 3, the reaction force generated when the hinge 3 and the case supporting member 10 are bent is Through the support piece 6B, the tapping screw 8 is concentrated on the support member fixing portion 9B of the instrument panel cover 9 into which the tapping screw 8 is screwed.
B is broken and separated from the instrument panel cover 9. As a result, the opening operation of the break opening portion 1 including the reinforcing plate 2 becomes unstable, and the opening 9
The expansion from A may be hindered.

Further, the rupture-opening portion 1 and the reinforcing plate 2 are formed such that the ridges 1A uniformly arranged in the entire area of the rupture-opening portion 1 are engaged with the coupling holes 2B of the same arrangement, and the back of the reinforcing plate 1A of the ridge 1A. The protruding end of the instrument panel is integrated by heating and melting and caulking. However, the break open portion 1 of the instrument panel cover 9 is broken along the break line by the inflation and deployment pressure of the airbag, and the hinge In the initial stage of opening in which the opening 3 is opened by the bending operation of the case 3 and the case supporting member 10, the stress that the breaking open portion 1 tends to separate from the reinforcing plate 2 concentrates on the welded portion of the break opening 1 on the hinge 3 side. Therefore, the welding portion on the hinge portion is broken before the breaking line on the hinge portion 3 is broken. As a result, the breaking along the breaking line of the breaking open portion 1 is hindered, so that the opening operation of the reinforcing plate 2 with the hinge portion 3 as a fulcrum cannot be performed smoothly, and the opening after the breaking open portion 1 is broken. There is a problem that a crack occurs at the edge of 9A.

Further, as shown in FIG. 1, the edge 2C of the reinforcing plate 2 is in a state of being punched out by a press. If burrs are generated, a gap is generated between the break open portion 1 and the reinforcing plate 2 due to the cutting return and the burrs,
In addition to being a factor in lowering the bonding strength between the rupture opening 1 and the reinforcing plate 2, the inflation and deployment pressure from the airbag via the stiffening plate 2 at the location of the rupture opening 1 opposite to the location where the gap is formed. It becomes difficult to act, which hinders the fracture along the fracture line of the fracture opening part 1, and there is also a possibility that cutting return or burrs may deform the opening 9A or cause a crack at the edge of the opening 9A. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a rupture operation along a rupture line of a rupture opening portion when an airbag is inflated and deployed, and a reinforcing plate member. Rotational movement can be performed smoothly without disturbing the inflation and deployment of the airbag, and a gap is created between the break open portion and the reinforcing plate, or the welded portion between the break open portion and the reinforcing plate is broken. It is an object of the present invention to provide a passenger-side airbag device without the need.

[0013]

According to a first aspect of the present invention, there is provided an instrument panel core constituting a vehicle instrument panel and a surface of the instrument panel core. The instrument panel cover to be covered, which is mounted at a position opposite to the passenger seat of the instrument panel core, accommodates an airbag which is inflated and deployed by gas from an inflator in a folded state, and a back surface of the instrument panel cover. An airbag case having an opening at an opposing location, a reinforcing plate fixed to the back surface of the instrument panel cover opposed to the opening of the airbag case, and an outer peripheral edge of the reinforcing plate facing the outer edge. Outside the reinforcement plate at the instrument panel cover In the passenger airbag device having a break open portion formed by forming a break line over the entire length of the airbag device, the reinforcing plate is connected to an upper end of the reinforcing plate, and is bent when the airbag is inflated and deployed. A main hinge portion for expanding the break open portion including the reinforcing plate material to the outside of the instrument panel cover, and is formed to extend rearward and rearward of the reinforcing plate material from an upper end of the main hinge portion, A secondary hinge portion that is secondarily bent when the airbag is inflated and deployed; a connecting portion connected to a leading edge of the secondary hinge portion; and a support connected to the connecting portion and fixed to the instrument panel cover. And is connected to the auxiliary hinge part.
At the connecting corner with the part to improve its bending strength
Multiple dents are formed at predetermined intervals in the longitudinal direction
It is characterized by the following.

According to a second aspect of the present invention, a plurality of dents for improving the bending strength are formed at predetermined intervals in a longitudinal direction at a connecting angle portion between the sub hinge portion and the connecting portion. Features. According to the third aspect of the present invention, a groove is formed on a peripheral portion of the reinforcing plate facing the instrument panel cover so as to bulge in a rear surface side direction of the reinforcing plate, thereby forming a groove on the peripheral portion and the peripheral portion. A gap is formed between the opposed instrument panel covers. The invention according to claim 4 is characterized in that the reinforcing plate is provided with two rows of connecting holes which are long in the vertical direction of the reinforcing plate and are arranged in the right and left direction of the reinforcing plate along the left and right direction of the reinforcing plate. Formed, and a row of the binding holes arranged in the left-right direction,
A plurality of rows are formed in the vertical direction of the reinforcing plate away from the main hinge portion. The invention according to claim 5 is
Forming ridges having the same shape and the same arrangement as the coupling holes at locations facing the coupling holes of the respective rows on the inner wall surface of the break open portion, engaging the respective ridges with the coupling holes facing each other, The protruding end of each projection on the back surface of the reinforcing plate is heated and melted and caulked to integrate the reinforcing plate and the break open portion.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an exploded perspective view of an instrument panel to which the passenger airbag device according to the present invention is attached, FIG. 5 is a vertical side view of the passenger airbag device according to the embodiment of the present invention, and FIG. 7 (A) and 7 (B) are perspective views of a reinforcing plate for reinforcing a break open portion of a passenger airbag device according to an embodiment of the present invention.
8 is an enlarged cross-sectional view along the line AA and the line BB in FIG. 6, FIG.
FIG. 9 is a perspective view of the open-to-rupture portion according to the embodiment of the present invention as viewed from the back surface, FIG. 9 is a cross-sectional view for explaining a main portion of the embodiment of the present invention before the airbag is inflated and deployed, and FIG. It is an explanatory cross-section of a main part when the airbag in the embodiment is inflated and deployed.

4 and 5, the instrument panel 20 includes an instrument panel core 201.
And an instrument panel cover 202 that covers the surface of the instrument panel core 201, and is formed of a resin molded product integrally formed of a synthetic resin material such as polypropylene. The instrument panel cover 202 is fixed to the instrument panel core 201 by an appropriate means such as a tapping screw.
Note that the outer surface of the instrument panel cover 202 is provided with a decorative / feeling and protection function made of a synthetic resin material such as polyvinyl chloride through a cushion layer made of a synthetic resin material such as foamed polypropylene (not shown). It is covered with a skin layer.

As shown in FIGS. 4 and 5, a metal airbag case 30 is provided at a position on the right side of the instrument panel cover 202 which faces the front passenger seat.
Is formed by the partition member 32. The partition member 32 includes a plurality of tapping screws 37.
Thus, it is configured to be fixed to a plurality of mounting portions 203 protruding from the instrument panel cover 202. Further, a break opening portion 40 which is opened when the airbag is inflated and deployed is formed at a portion of the instrument panel cover 202 facing the housing portion 31. The rupture opening 40 is provided in the opening 30 of the airbag case 30.
1 has a rectangular shape with substantially the same area.

In the case where the break opening portion 40 is formed in the instrument panel cover 202 facing the housing portion 31, a known laser generating means (not shown) generates a pulsed laser of a predetermined frequency, for example, 7 kHz (output = 3 ~
5KW) is generated intermittently at a fixed cycle, and a sensor for detecting a laser is disposed on the skin layer side of the opening 301. The laser is applied from the back side of the instrument panel cover 202 to the back side thereof. Irradiation is performed while moving relatively at a predetermined speed along the outer edge of the reinforcing plate member 50 fixed to the outer peripheral edge of the reinforcing plate member 50 through a small hole penetrating the instrument panel cover 202 in the thickness direction. The break line 60 shown in FIGS. 4, 5 and 8 is formed. The area surrounded by the rupture line 60 becomes the rupture opening portion 40 that is ruptured and opened along the rupture line 60 when the airbag 33 is inflated and deployed.

The air bag case 30 is housed in a housing 31.
As a method of mounting the inside of the air bag, as shown in FIG. 5, an upper end of the air bag case 30 on the opening 301 side is fixed to a support member 21 connected to a reinforcing plate member 50 described later with screws 22. Opening 30 of case 30
This is performed by fixing the lower end on the one side to the partition member 32 with bolts and nuts 24 via the connecting member 23 welded to the lower end. An airbag 33 is accommodated in the airbag case 30 in a folded state. The airbag 33 includes an inflator (gas generator) (not shown) provided outside the partition member 32. It is connected through a gas blowing pipe 29. The opening 301 of the airbag case 30 is closed by an airbag protection cover 35 made of a thin cloth made of chemical fiber. The airbag protection cover 35 is for preventing the airbag 33 from accidentally protruding from the airbag case 30 when the airbag 33 is not used.
3 easily breaks when expanded and deployed.

A metal reinforcing plate 50 shown in FIG. 4 is fixed to the inner wall surface of the opening 40. As shown in FIG. 5, the reinforcing plate member 50 is curved into a shape that matches the inner wall surface of the break open portion 40 and is formed in a substantially rectangular shape slightly smaller than the area of the break open portion 40. And at the upper end in the short direction of the reinforcing plate member 50,
The main hinge portion 5 is bent when the airbag 33 is inflated and deployed, and is used to deploy the break open portion 40 including the reinforcing plate member 50 to the outside of the instrument panel cover 202.
01 is formed to extend in the longitudinal direction of the reinforcing plate 50. The main hinge portion 501 is formed by processing a plate material into a groove shape.

The main hinge portion 501 is connected to the upper end thereof and is formed by bending the reinforcing plate 50 rearward and rearward at a substantially right angle, and is a secondary hinge which is secondary bent when the airbag 33 is inflated and deployed. Part 502;
A connecting portion 503 connected to the leading edge of the sub hinge portion 502 and bent upward at a substantially right angle; and a support connected to the upper end of the connecting portion 503 and bent substantially perpendicularly to the rear of the connecting portion 503. A piece 504 is provided. A plurality of holes 502A are formed in the auxiliary hinge portion 502 along the longitudinal direction of the auxiliary hinge portion 502 to facilitate bending deformation during inflation and deployment of the airbag. A plurality of concave portions 505 for improving the bending strength are formed at predetermined intervals in the longitudinal direction at the joint corner between the sub hinge portion 502 and the connecting portion 503.

As shown in FIG. 5, the distal end of the support piece 504 uses the tapping screw 37 for attaching the partition member 32 to the instrument panel cover 2.
02 is fixed to the mounting portion 203 protruding. As a result, the reinforcing plate member 50 is attached to the instrument panel cover 20.
2 is supported. The support member 21 of the airbag case 30 is connected to the connecting portion 503 of the reinforcing plate 50.
Bolts at multiple locations. It is fixed by a nut 25. The lower edge 506 and the left and right side edges 507 of the reinforcing plate 50 have an arc-shaped cross section in the direction of the back side of the reinforcing plate 50 as shown in FIGS. 5, 6, 7A and 7B. It is formed in the shape of an arcuate groove that swells, and further, the lower end edge 506 and the front edges 506A and 507A of the left and right side edges 507 are
A predetermined gap d (approximately 0.3 to 0.5 mm) is provided from the inner wall surface of the break open portion 40 facing these, and a gap is formed. This prevents cutting return and burrs generated at the leading edges 506A and 507A during press-cutting of the reinforcing plate member 50 from coming into contact with the inner wall surface of the opening 40.

The reinforcing plate 50 is provided with a plurality of reinforcing recesses 508 extending in the short direction thereof at intervals in the longitudinal direction of the reinforcing plate 50. Also, the reinforcing plate 50
In the middle portion in the short direction, two coupling holes 509 that are long in the short direction of the reinforcing plate member 50 and are arranged close to the long direction of the reinforcing plate member 50 are provided along the long direction of the reinforcing plate member 50. Further, near the lower end of the reinforcing plate member 50, four coupling holes 510 that are long in the short direction of the reinforcing plate member 50 and that are arranged vertically and horizontally adjacent to each other are long. A plurality is formed along the direction.

As shown in FIG. 8, a ridge 401 having the same shape and the same arrangement as the coupling holes 509 is provided at the longitudinally intermediate portion of the inner wall surface of the break opening portion 40.
Further, a plurality of ridges 402 having the same shape and the same arrangement as the coupling holes 510 are formed in the longitudinal direction of the break open portion 40 near the lower end of the break open portion 40. ing. The ridge 4 of the break open portion 40
No. 01 and 402 are coupled holes 509 of the reinforcing plate 50 facing each other.
And 510, the protruding ends of the ridges 401 and 402 projecting from the back surface of the reinforcing plate 40 are heated and melted and caulked, whereby the reinforcing plate 50 can be integrally fixed to the inner wall surface of the break open portion 40. It has a configuration.

In the passenger-side airbag apparatus according to the above-described embodiment, when a vehicle such as an automobile equipped with the collision collides, an impact force at the time of the collision is detected by a sensor, and the impact force detected by the sensor is detected. A control device comprising a CPU or the like determines whether or not the force has become a predetermined value or more. By supplying this gas to the air bag 33, the air bag 33 is rapidly inflated and deployed. When the break open portion 40 of the instrument panel cover 202 is pressed from the inside through the reinforcing plate 50 by the pressing force of the air bag 33 when the air bag 33 is inflated and deployed, the break open portion 40 follows the break line 60. The main hinge portion 501 of the reinforcing plate member 50 that has been broken and separated from the instrument panel cover 202 and has received the inflation and deployment pressure of the airbag 33 is bent in the opening direction of the break opening portion 40, thereby including the reinforcing plate member 50. The break open part 40 is opened from the state shown in FIG. 9 to the state shown by the imaginary line in FIG. 10, and the sub hinge part 502 is bent to the state shown by the solid line in FIG.
As shown by the solid line in FIG.
The reinforcing plate 50 is turned upside down and appears on the surface. In this state, the opening 6 for inflation and deployment of the airbag 33 is opened.
1 is completely opened, the airbag 33 is moved from the fully opened opening 61 to the instrument panel cover 202.
The inflated and deployed airbag 33 supports the chest and head of the passenger in the passenger seat by the cushioning action of the airbag 33, thereby protecting the occupant from the impact force at the time of vehicle collision,
Its safety can be ensured.

As described above, the main hinge portion 501 and the sub hinge portion 502 are provided on the reinforcing plate member 50 supporting the break open portion 40, and the main hinge portion 501 and the sub hinge portion 502 are attached to the air bag 33 covering the break open portion 40. , The opening of the break open portion 40 including the reinforcing plate member 50 is smoothly performed, and the bending reaction force of the hinge portion is reduced.
Attachment section 203 to which support piece 504 of reinforcing plate material 50 is fixed
Is not broken by the bending reaction force of the hinge portion. For this reason, the break open portion 4 including the reinforcing plate 50
The opening operation of the air bag 33 is stable, and there is no possibility that the inflation and deployment of the air bag 33 will be hindered.

Further, at the initial stage when the break open portion 40 is broken along the break line by the inflation and deployment pressure of the airbag and opened by the bending operation of the main hinge portion 501, the break open portion 40 is provided on the main hinge portion 501 side. Even if the stress that tries to separate from the reinforcing plate 50 acts on the break open portion 40, the welded portion is broken because there is no welded portion with the reinforcing plate 50 at the break open portion 40 on the main hinge portion 501 side. The above-mentioned problem can be solved, and the above-mentioned stress can be absorbed by the elastic deformation of the break open portion 40. In addition, the breaking open portion 40
The welding between the reinforcing plate member 50 and the reinforcing plate member 50 is performed by heating and melting the joint holes 509 and 510 of the reinforcing plate member 50 by using two or three rows of convex ridges 401 and 402 which are long in the short direction of the fracture opening portion 40. Therefore, the bonding strength between the break open portion 40 and the reinforcing plate 50 can be sufficiently ensured. Accordingly, the opening of the reinforcing plate 40 with the hinge portion as a fulcrum can be smoothly performed, and the edge of the opening 61 after the breaking open portion 40 is broken can be stabilized. It is possible to prevent the occurrence of cracks in the part.

The lower edge 506 and the left and right side edges 507 of the reinforcing plate 50 are formed in an arc-shaped groove bulging in an arc-shaped cross section in the direction of the back surface of the reinforcing plate 50. The leading edge 506A of the left and right side edges 507,
507A is separated from the inner wall surface of the break open portion 40 facing these by a predetermined distance.
It is possible to prevent cutting return and burrs generated on the leading edges 506A and 507A from contacting the inner wall surface of the break open portion 40 at the time of press punching. Along with this, even if the break open portion 40 and the reinforcing plate 50 are integrally welded, a gap may be generated between the break open portion 40 and the reinforcing plate 50 due to cutting back or burrs,
The bonding strength between the break open portion 40 and the reinforcing plate member 50 is not reduced, and the break along the break line of the break open portion 40 can be surely performed.
1 can be prevented from being deformed, and the edge of the opening 61 can be prevented from being cracked.

[0029]

As described above, according to the airbag device for the passenger seat of the present invention, the main hinge portion and the sub hinge portion are provided on the reinforcing plate supporting the break open portion, and the main hinge portion and the sub hinge portion are connected to each other. Since the air bag inflated and deployed at the break opening portion is configured to be bent in two stages sequentially, the opening operation of the break opening portion including the reinforcing plate material becomes smooth, and the bending reaction force of the hinge portion is reduced. Therefore, the mounting portion to which the support piece of the reinforcing plate is fixed is not broken by the bending reaction force of the hinge portion. For this reason, the opening operation of the rupture opening portion including the reinforcing plate material is stabilized, and there is no risk that the air bag will be inflated and deployed.

Further, according to the present invention, a groove is formed in a peripheral portion of the reinforcing plate facing the instrument panel cover so as to protrude toward the rear surface side of the reinforcing plate, and the peripheral portion and the instrument facing the peripheral portion are formed. Since the gap is formed between the ment panel covers, even if the break open portion and the reinforcing plate material are welded together, a gap is created between the break open portion and the reinforcing plate material due to cutting back or burr, It does not decrease the bonding strength with the reinforcing plate material, and it can surely break along the breaking line at the breaking open part, and cutbacks and burrs deform the opening and crack the edge of the opening. Can be prevented.

According to the present invention, the reinforcing plate is formed with a plurality of vertically extending two rows of coupling holes along the left-right direction of the reinforcing plate. A plurality of rows are formed in the vertical direction of the reinforcing plate material apart from the main hinge part, and furthermore, on the inner wall surface of the break open part, at a position opposed to the connection holes of each row, a ridge having the same shape and the same arrangement as the connection holes is provided. A configuration in which the reinforcing plate is integrated with the break open portion by forming and engaging the ridges with opposed coupling holes, and heating and melting the protruding ends of the respective ridges to the back surface of the reinforcing plate. As a result, in addition to securing sufficient bonding strength between the break open part and the reinforcing plate, it is stable to break along the break line of the break open part, and the opening operation of the reinforcing plate with the hinge as a fulcrum can be performed smoothly, Cracks occur at the edge of the opening after the break opening is broken Benefit of a can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional break open portion formed on an instrument panel cover and a reinforcing plate member for reinforcing the break open portion from the inner surface. FIG. 2 is a cross-sectional view for explaining a main part before the airbag is inflated and deployed. FIG. 3 is a cross-sectional view for explaining a main part when the airbag is inflated and deployed. FIG. 5 is an explanatory diagram when a portion is formed.

FIG. 2 is an explanatory cross-sectional view of a main part of a conventional air bag before the air bag is inflated and deployed.

FIG. 3 is an explanatory cross-sectional view of a main part when a conventional air bag is inflated and deployed.

FIG. 4 is an exploded perspective view of an instrument panel to which the passenger airbag device according to the present invention is attached.

FIG. 5 is a vertical sectional side view of the airbag device for a passenger seat in the embodiment of the present invention.

FIG. 6 is a perspective view of a reinforcing plate for reinforcing a break open portion of the passenger airbag device according to the embodiment of the present invention.

FIGS. 7A and 7B are enlarged sectional views taken along lines AA and BB in FIG. 6;

FIG. 8 is a perspective view of the break open portion in the embodiment of the present invention as viewed from the back surface.

FIG. 9 is an explanatory cross-sectional view of a main part before the airbag inflates and deploys in the embodiment of the present invention.

FIG. 10 is an explanatory sectional view of a main part when the airbag in the embodiment of the present invention is inflated and deployed.

[Explanation of symbols]

 Reference Signs List 20 instrument panel 201 instrument panel core 202 instrument panel cover 203 mounting part 30 airbag case 33 airbag 40 break open part 401, 402 convex part 50 reinforcing plate material 501 main hinge part 502 sub hinge part 502A hole 503 connecting part 504 Support piece 505 Depression 506 Lower edge 507 Left and right side edge 506A, 507A Tip edge 509, 510 Coupling hole 60 Break line 61 Opening

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (4)

(57) [Claims] 1. An instrument panel core that forms an instrument panel of a vehicle, an instrument panel cover that covers a surface of the instrument panel core, and an instrument panel core that is mounted at a location facing a passenger seat of the instrument panel core. An airbag case that accommodates an airbag that is inflated and deployed by gas from an inflator in a folded state and that has an opening at a location facing the back surface of the instrument panel cover; and an opening facing the opening of the airbag case. A reinforcing plate material fixed to the back surface of the instrument panel cover, and forming a break line over the entire length of the outer periphery of the reinforcing plate material at a location of the instrument panel cover facing the outer peripheral edge of the reinforcing plate material. Assistant with formed break opening In the airbag device for a seat, the reinforcing plate is connected to an upper end of the reinforcing plate, and is folded at the time of inflation and deployment of the airbag, so that a break opening portion including the reinforcing plate is expanded outward of the instrument panel cover. A main hinge portion for extending the main hinge portion, a sub hinge portion which is formed to extend rearward from the upper end of the main hinge portion to the rear side of the reinforcing plate member, and is secondarily bent when the airbag is inflated and deployed; A connecting portion connected to the leading edge of the hinge portion, and a support piece connected to the connecting portion and fixed to the instrument panel cover, and at a connecting corner portion between the sub hinge portion and the connecting portion.
The dent to improve the bending strength is longitudinal
A plurality of passengers at predetermined intervals
Airbag device for seats. 2. A peripheral portion of the reinforcing plate material facing the instrument panel cover is formed with a groove bulging in a direction toward the back side of the reinforcing plate material, so that the peripheral portion and the instrument facing the peripheral edge portion are formed. 2. A passenger airbag device according to claim 1, wherein a gap is formed between the panel covers. 3. The reinforcing plate member is arranged so as to be longer in the up-down direction of the reinforcing plate member and to be arranged close to the left-right direction of the reinforcing plate member.
Form a plurality of connecting holes in the row along the left and right direction of the reinforcing plate,
2. The airbag device for a passenger seat according to claim 1, wherein a plurality of rows of the connecting holes arranged in the left-right direction are formed in a vertical direction of the reinforcing plate away from the main hinge portion. 4. A ridge having the same shape and the same arrangement as the coupling holes is formed on the inner wall surface of the breaking open portion at a position facing the coupling holes in the respective rows, and the coupling holes opposing the respective ridges. 4. The assistant according to claim 3 , wherein the reinforcing plate is integrated with the fracture opening by heating and melting the protruding end of each convex streak to the back surface of the reinforcing plate. Airbag device for seats.