JP3185561B2 - Airbag device for passenger seat - Google Patents

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, which inflates an airbag bag for an occupant sitting in a passenger seat when the vehicle suddenly decelerates.

[0002]

2. Description of the Related Art There is a type of an airbag device for a passenger seat which is disposed at the top of an instrument panel. In this type, an airbag door provided at the top of the instrument panel at the time of sudden deceleration of a vehicle is provided. The airbag bag is deployed to the occupant seated on the front passenger seat.

Here, there are various types of hinge structures which are the center of deployment of the airbag door.
No. 7489.

As shown in FIG. 6, such an airbag device for a passenger seat is provided with an airbag case 70 having a hollow inside, in which a cylindrical inflator 72 and a folding type airbag are provided. The airbag bag 74 in the state is accommodated. An airbag door 76 is provided on the upper surface of the instrument panel facing the opening 70A of the airbag case 70.

[0005] A strap passing portion 78 is formed on the back surface 76A of the airbag door 76, and one end portion 80A of the strap 80 is wound around the strap passing portion 78. On the other hand, the other end 80B of the strap 80
Is wound around an anchor 82 fixed to the vehicle front portion 70B of the airbag case 70.

[0006]

However, in this airbag device for a passenger seat, both ends 8 of the strap 80 are provided.
0A and 80B are wound around the strap passing portion 78 and the anchor 82, respectively.
80B and the intermediate portion 80C are overlapped and sewn. Accordingly, the length of the strap 80 is the length L of the sutured portion.
1 and a margin L at the time of suturing, a length L2 between the suturing portion and the strap passing portion 78 and a length L3 between the suturing portion and the anchor 82 are required. Therefore, if the length from the tip 76B of the airbag door 76 to the strap passing portion 78 is L4, the turning radius R of the tip 76B of the airbag door 76 when the airbag door is deployed is approximately L1 + L.
2 + L3 + L4, and considering the interference between the airbag door 76 and the front window glass, the strap 80
In this case, it is difficult to secure the lengths L1, L2, and L3.

The present invention has been made in view of the above circumstances, and has as its object to provide an airbag device for a passenger seat that can reduce the turning radius of the tip of the airbag door near the windshield.

[0008]

According to a first aspect of the present invention, there is provided a vehicle having a windshield glass which is disposed on a passenger seat at the top of an instrument panel of a vehicle and is pressed by an airbag bag which expands when the vehicle is rapidly decelerated. An airbag device for a passenger seat having an airbag door that deploys to
An airbag case having an airbag inflation opening toward the airbag door, one end of which is attached to a front portion of the airbag case in a vehicle, and the other end of which is attached to the airbag door, as a hinge of the airbag door. A functioning strap, and a guide portion arranged along a vehicle front surface of the strap and having an upper end reaching near the upper end of the airbag case , wherein the airbag of the strap is provided .
The door-side end is located near the upper end of the guide portion in a hinge.
A structure that rotates toward the windshield glass as a center
It is characterized by being made.

According to the present invention, there is provided an instrument for a vehicle.
Located on the passenger seat side at the top of the instrument panel, sudden deceleration of the vehicle
Sometimes inflated by the airbag bag
Equipped with an airbag door that deploys to the shield glass side
An airbag device for a passenger seat, wherein the airbag door is
Airbag case with airbag inflatable outlet
And one end is attached to the front of the airbag case.
The other end is attached to the airbag door and the air
With the strap functioning as the hinge of the bag door,
The strap is placed along the front surface of the vehicle and the upper end is
A guide part that reaches near the upper end of the bag case.
The guide portion is a vehicle front side wall portion of an airbag case having a slit through which the strap passes.

According to a third aspect of the present invention, there is provided an instrument for a vehicle.
Located on the passenger seat side at the top of the instrument panel, sudden deceleration of the vehicle
Sometimes inflated by the airbag bag
Equipped with an airbag door that deploys to the shield glass side
An airbag device for a passenger seat, wherein the airbag door is
Airbag case with airbag inflatable outlet
And one end is attached to the front of the airbag case.
The other end is attached to the airbag door and the air
With the strap functioning as the hinge of the bag door,
The strap is placed along the front surface of the vehicle and the upper end is
A guide part that reaches near the upper end of the bag case.
Further, the airbag door is provided with a rib that interferes with the guide portion when deployed.

[0011]

According to the first aspect of the present invention, when the vehicle suddenly decelerates, the airbag bag inflates. Therefore, the airbag door is pressed by the airbag body, and is deployed toward the windshield glass using the strap as a hinge. At this time, the rotation of the airbag case mounting portion side portion is regulated by a guide portion which is arranged along the front surface of the vehicle and whose upper end reaches near the upper end portion of the airbag case, and the strap is positioned on the airbag door side. The ends are
Set the vicinity of the upper end of the
Rotate in the direction of the glass . For this reason, the center of the hinge moves upward in comparison with the conventional structure in which the hinge center of the strap serves as a mounting portion at the front of the vehicle of the airbag case.
The turning radius of the tip of the airbag door near the windshield glass located in front of the hinge from the center of the hinge is reduced, and it is difficult to interfere with the windshield glass.

According to the second aspect of the present invention, the vehicle sharply decreases.
When the speed is high, the airbag bag inflates. For this reason,
The bag door is pressed by the airbag bag,
Using the trap as a hinge to the windshield glass side
expand. At this time, the strap should be along the front of the vehicle.
And the upper end is close to the upper end of the airbag case.
The guide section allows the airbag case
Rotation is regulated. Therefore, the strap hinge center
Is near the upper end of the airbag case. For this reason,
The hinge center of the strap is in front of the vehicle in the airbag case.
The hinge center is higher than the conventional structure that is the mounting part of
Is located in front of the vehicle from the center of this hinge
Airbag door tip near windshield glass
The turning radius becomes smaller and interferes with the windshield glass
It becomes difficult to do. Further, since the guide portion is a vehicle front side wall portion of the airbag case having a slit through which the strap passes, it is not necessary to add another member constituting the guide portion, so that the number of parts and weight are reduced.

According to the third aspect of the present invention, the vehicle suddenly decreases.
When the speed is high, the airbag bag inflates. For this reason,
The bag door is pressed by the airbag bag,
Using the trap as a hinge to the windshield glass side
expand. At this time, the strap should be along the front of the vehicle.
And the upper end is close to the upper end of the airbag case.
The guide section allows the airbag case
Rotation is regulated. Therefore, the strap hinge center
Is near the upper end of the airbag case. For this reason,
The hinge center of the strap is in front of the vehicle in the airbag case.
The hinge center is higher than the conventional structure that is the mounting part of
Is located in front of the vehicle from the center of this hinge
Airbag door tip near windshield glass
The turning radius becomes smaller and interferes with the windshield glass
It becomes difficult to do. In addition, since the rib that interferes with the guide part when the airbag door is deployed is provided, the rib interferes with the guide part when the airbag door is deployed, and the rib is elastically or plastically deformed. It takes.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment of a Passenger-Seat Airbag System According to the Present Invention
An embodiment will be described with reference to FIGS.

The first embodiment corresponds to one embodiment of the present invention. Also, in each of the drawings, an appropriately indicated arrow FR indicates a vehicle front side, and an arrow UP indicates a vehicle upper side.

As shown in FIG. 2, a predetermined opening 14 is formed in the instrument panel 12 of the vehicle on the passenger seat side of the top portion 12A, and the airbag device 10 is disposed inside the opening 14. Has been established. Note that a windshield glass 27 is provided above the instrument panel 12.

The airbag device 10 includes a substantially box-shaped airbag case 16 having an opening 16A on the top 12A side of the instrument panel 12. A cylindrical inflator 18 is provided at the bottom of the airbag case 16. Furthermore, the airbag case 16
In the vicinity of the opening 16A, the airbag body 20 is stored in a folded state.

The inflator 18 generates a large amount of gas when a mechanical ignition type or electric ignition type sensor (not shown) detects a sudden deceleration of the vehicle. An example of the internal structure of the inflator 18 will be briefly described as follows. A primer (in the case of a mechanical ignition type) or an ignition device (in the case of an electric ignition type) is disposed at one end of the inflator 18 in the axial direction. The device operates. In addition, a transfer agent is provided on the shaft core of the inflator 18, and a gas generating agent is sealed around the transfer agent. Therefore, when the primer is ignited or the ignition device is activated, the gas generating agent burns through the transfer agent to generate a large amount of gas. The generated gas is supplied to the inflator 18.
Through a plurality of gas holes formed in the peripheral surface of the bag body 20 into the folded bag body 20.

The opening 16A of the airbag case 16 accommodating the above-described inflator 18 and the bag body 20 is closed by an airbag door 22 formed of a resin such as urethane. Note that this airbag door 22
Closes the opening 14 described above.

In the vicinity of the front end portion 22B of the back surface 22A of the airbag door 22, a pair of strap passing portions 24 is fixed at a predetermined interval in the vehicle width direction. One end 26A of each of the straps 26 made of cloth is wound. The other end 26B of the strap 26 is fixed to an anchor 28.

As shown in FIG. 3, a lower portion of the anchor 28 is a mounting portion 28A, and a mounting hole 29 is formed in the mounting portion 28A.

As shown in FIG. 1, the mounting portion 28A of the anchor 28 is
B, a weld bolt 30 erected in a substantially middle portion of the front surface in the vertical direction and inserted into the mounting hole 29;
It is fixed to the airbag case 16 with a nut 32 screwed into the airbag case 16. The portion of the anchor 28 above the mounting portion 28A extends along the vehicle front side wall portion 16B of the airbag case 16 substantially toward the upper rear side of the vehicle and serves as a guide portion 28B.

As shown in FIG. 3, a pair of upper and lower slits 34 extending in the vehicle width direction are formed at a substantially vertical intermediate portion of the guide portion 28B of the anchor 28.

As shown in FIG. 1, the end 26B of the strap 26 wound around the pair of slits 34 of the anchor 28
And a strap 26 wound around the strap passing portion 24.
26A is the guide portion 28B and the vehicle front side wall 1
6B and the intermediate portion 26C of the strap 26, respectively.

The operation of the first embodiment will be described below.
When the vehicle suddenly decelerates, this vehicle sudden deceleration state is sensed by a sensor (not shown). As a result, the primer in the inflator 18 is ignited or the ignition device is activated, so that the gas generating agent burns through the transfer agent. For this reason,
A large amount of gas is generated and flows into the folded airbag body 20. Therefore, the airbag body 20 inflates and presses the airbag door 22 from inside.

As a result, the airbag door 22 is connected to the windshield glass 2 using the strap 26 as a hinge.
It unfolds in seven directions (arrow A direction of FIG. 1). At this time, the airbag door 22 attempts to rotate with the point of engagement with the slit 34 of the strap 26 as the hinge center P1, but the rotation of the intermediate portion 26C of the strap 26 is restricted by the guide portion 28B of the anchor 28.

Therefore, the end 26A of the strap 26
As shown by an imaginary line in FIG.
The portion near the upper end of B is rotated in the direction of the windshield glass 27 (the direction of arrow B in FIG. 1) as a hinge center P2.
For this reason, as the hinge center P2 of the strap 26 moves rearward and upward from P1, the tip of the airbag door 22 near the windshield glass located forward of the hinge center P2 (reference numeral 22C in FIG. 2). The radius of gyration becomes small, and it becomes difficult to interfere with the windshield glass 27.

Therefore, as shown in FIG. 1, the length L1 of the sewn portion, the length L2 between the sewn portion and the strap passing portion 24 as a margin for suturing, the sewn portion and the slit 34 are provided. And it is easy to sufficiently secure the length L3 between them, and the degree of freedom in design is improved.

The front end portion 22B of the airbag door 22
Therefore, the amount of movement of the instrument panel 12 and the peripheral components that interfere with the front end portion 22B of the airbag door 22 can be reduced.

Next, a second embodiment of the airbag device for a passenger seat according to the present invention will be described with reference to FIG.

The second embodiment corresponds to one embodiment of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, in the second embodiment,
A slit 40 extending in the vehicle width direction is formed in the vehicle front side wall portion 16B of the airbag case 16, and an intermediate portion 26C of the strap 26 from the anchor 42 fixed to the airbag case 16 to the strap passing portion 24 is near.
It passes through the slit 40. For this reason, the strap 2
6 is guided from the anchor 42 into the airbag case 16 through the slit 40, and reaches the strap passing portion 24 along the inside of the vehicle front side wall portion 16B. That is, the slit 4 in the vehicle front side wall portion 16B of the airbag case 16 is formed.
The portion above 0 is the guide portion 44.

Next, the operation of the second embodiment will be described. In the second embodiment, the airbag door 22 is
6 as a hinge, the direction of the windshield glass (FIG. 4)
(In the direction of arrow A). At this time, the airbag door 2
2 attempts to rotate with the point of engagement with the anchor 42 as the hinge center P3, but the guide portion 4 of the airbag case 16
4, the rotation of the intermediate portion 26C of the strap 26 is restricted.

Accordingly, the strap 26 rotates with the upper end of the guide portion 44 of the airbag case 16 as the hinge center P4. For this reason, as the hinge center P4 of the strap 26 moves rearward and upward from P3, the tip of the airbag door 22 near the windshield glass located forward of the hinge center P4 (reference numeral 22 in FIG. 2).
The turning radius of C) becomes small, and it becomes difficult to interfere with the windshield glass 27.

Therefore, as in the first embodiment, the length of the sewn portion, the length between the sewn portion and the strap passing portion 24 as a margin for suturing, and the distance between the sewn portion and the anchor 42 are provided. It is easy to secure a sufficient length, and the degree of freedom in design is improved.

Further, in the second embodiment, since the guide portion 44 is constituted by the vehicle front side wall portion 16B of the airbag case 16 having the slit 40 through which the strap 26 passes, another member constituting the guide portion is added. Since there is no need, the number of parts and the weight can be reduced.

Next, a third embodiment of the airbag device for a passenger seat according to the present invention will be described with reference to FIG.

The third embodiment corresponds to an embodiment of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, in the third embodiment,
A rib 50 extending downward from the front end portion 22B of the airbag door 22 along the front surface of the guide portion 28B of the anchor 28 is formed, and the rib 50 is formed along the vehicle width direction. The lower end 50 </ b> A of the rib 50 reaches the vicinity of the slit 34 and interferes with the guide 28 </ b> B of the anchor 28 when the airbag door 22 is deployed.

Next, the operation of the third embodiment will be described. In the third embodiment, when the airbag door is deployed, the rib 50 rotates integrally with the airbag door 22 and comes into contact with the front surface of the guide portion 28B of the anchor 28 as shown by the imaginary line in FIG. Then, with the deployment of the airbag door 22,
Since the rib 50 is elastically or plastically deformed, the deployment of the airbag door 22 is braked.
Kinetic energy can be reduced.

[0041]

As described above, the airbag apparatus for a passenger seat according to the first aspect of the present invention has an airbag case having an airbag inflatable opening toward the airbag door, and one end of the airbag. A strap attached to the front of the case and having the other end attached to the airbag door and functioning as a hinge of the airbag door; and an upper end of the strap arranged along the front surface of the vehicle and near the upper end of the airbag case. A guide section and a strap air
The bag door side end is hinged near the upper end of the guide.
The structure that rotates in the direction of the windshield glass as the center has an excellent effect that the radius of rotation of the tip of the airbag door near the windshield glass can be reduced.

Further, the present invention according to claim 2 is a vehicle
The instrument panel is located on the front passenger seat side,
Pressed by the airbag bag that expands during sudden deceleration
An airbag door that extends to the windshield glass side
An airbag device for a passenger seat provided with an airbag
Airbag with an airbag inflation outlet
And one end attached to the front of the airbag case
And the other end is attached to the airbag door.
This strap with a strap that acts as a hinge for the
The airbag case is located along the front of the vehicle and has an upper end
And a guide portion extending near the upper end of the guide portion is a vehicle front side wall portion of the airbag case having a slit strap passes, windshield
Reduce the turning radius of the tip of the airbag door in the vicinity.
And an excellent effect of reducing the number of parts and weight.

Further, the present invention according to claim 3 provides a vehicle
The instrument panel is located on the front passenger seat side,
Pressed by the airbag bag that expands during rapid deceleration
Airbag door that extends to the windshield glass side
An airbag device for a passenger seat, comprising:
Airbag having an airbag inflatable opening toward the door
Case and one end attached to the front of the airbag case
The other end is attached to the airbag door and the airbag
And a strap that functions as a hinge for the
The airbag casing is located along the front
And a guide part that reaches the vicinity of the upper end of the airbag, and a rib that interferes with the guide part when deployed on the airbag door is provided.
Airbag door tip near windshield glass
This has the excellent effect that the turning radius can be reduced and the deployment of the airbag door can be braked.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional side view showing a main part of a passenger airbag device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the airbag device for a passenger seat according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing an anchor of the airbag device for a passenger seat according to the first embodiment of the present invention.

FIG. 4 is an enlarged side sectional view showing a main part of an airbag device for a passenger seat according to a second embodiment of the present invention.

FIG. 5 is an enlarged side sectional view showing a main part of an airbag device for a passenger seat according to a third embodiment of the present invention.

FIG. 6 is a side sectional view of an airbag device for a passenger seat according to a conventional example.

[Explanation of symbols]

 Reference Signs List 10 airbag device 12 instrument panel 12A top 16 airbag case 16B vehicle front side wall 20 airbag body 22 airbag door 24 strap passing part 26 strap 27 windshield glass 28 anchor 28B guide part 40 slit 42 anchor 44 guide Part 50 rib

Claims (3)

(57) [Claims] 1. An airbag for a passenger seat, which is disposed on a passenger seat top of an instrument panel of a vehicle and is provided with an airbag door which is pressed by an airbag bag inflated during rapid deceleration of the vehicle and expands toward a windshield glass. An airbag case having an airbag inflation opening toward the airbag door, one end of which is attached to a vehicle front part of the airbag case, and the other end of which is attached to the airbag door. A strap functioning as a hinge of the airbag door, and a guide portion arranged along the vehicle front surface of the strap and having an upper end reaching near the upper end of the airbag case, and an end of the strap on the airbag door side. Department
But with the vicinity of the upper end of the guide portion as the hinge center,
An airbag device for a passenger seat, wherein the airbag device is configured to rotate in the direction of the windshield glass . 2. The instrument panel of the vehicle
An airbag located on the passenger side that expands when the vehicle suddenly decelerates
Pressed by the bag to expand toward the windshield glass
Airbag device for passenger seat with open airbag door
An airbag bag body facing the airbag door
An airbag case having an inflatable port,
And the other end is attached to the front of the vehicle.
Hinged to the airbag door
Functioning strap and the front of the vehicle
The upper end is arranged along the upper end of the airbag case.
It includes a guide portion extending in the vicinity, wherein the guide portion includes an air bag apparatus for assistant's seat you being a vehicle front side wall portion of the airbag case having a slit in which the strap passes. 3. The instrument panel of a vehicle, comprising :
An airbag located on the passenger side that expands when the vehicle suddenly decelerates
Pressed by the bag to expand toward the windshield glass
Airbag device for passenger seat with open airbag door
An airbag bag body facing the airbag door
An airbag case having an inflatable port,
And the other end is attached to the front of the vehicle.
Hinged to the airbag door
Functioning strap and the front of the vehicle
The upper end is arranged along the upper end of the airbag case.
Includes a guide portion extending in the vicinity of, the said guide portion and the air bag apparatus for assistant's seat you characterized in that a interfering rib during deployment to the airbag door.