JP2000313297A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device capable of performing normal expansion without becoming too high in pressure even when an upper surface of a module cover is shut for some reason at expansion of the air bag. SOLUTION: This air bag device comprises a bag, a module cover 20, and a supporting member for supporting the module cover 20, and the module cover 20 is provided with an upper surface 21, a frame part formed by extending from a back surface side of the upper surface 21, and a tear line 70. The module cover 20 has an auxiliary tear line 73 being continuous or contiguous with the tear line 70 and formed both outside of the frame part of the upper surface 21 and in an outside region of the tear line 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device, and more particularly, to an airbag device with improved bag deployment.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, for example, an airbag device is folded by covering an inflator 100, a retainer 110 holding the inflator 100, and a gas ejection port 101 of the inflator 100. The bag 120, a bag ring 130 connecting the bag 120 to the inflator 100, and the bag ring 130 attached to the retainer 110.
An airbag device including a module cover 140 that covers the airbag 20 and the inflator 100 is known.

[0003] In this airbag apparatus, a retainer 110 is provided.
The cover attachment portion 111 formed on the module cover 140 and the coupling portion 141 of the module cover 140 are fixed to each other with a fixing tool 151 such as a rivet.
And retainer 110 and module cover 1
40.

Generally, the operation of the airbag apparatus is such that the bag 120 is inflated by the gas generated from the inflator 100, and the pressure of the gas causes the airbag device to operate as shown in FIGS.
As shown in (1), a tear portion (cleavage line: thin portion) 141 of the module cover 140 is broken, a gas is filled in a bag (not shown), and the bag is deployed.

[0005] At this time, if the upper surface of the module cover 140 (that is, the tearing surface side of the cover) is closed for some reason (for example, the upper surface of the module cover 140 is closed by the occupant's body). In the case of close proximity deployment), the module cover 140 is in a state in which it is difficult to tear.

[0006] As described above, when the upper surface of the module cover 140 is closed for some reason, the module cover 140 is opened so that the module cover 140 is sufficiently cleaved.
The bag folding method may be devised or the inflator 100
A technology that responds to such problems by adjusting the output of the device has been proposed.

However, as described above, when the airbag device is operated in a state where the upper surface of the module cover 140 is closed, the module cover 140, which is normally torn, is prevented from being torn. In this state, the gas is continuously filled in the bag 120, so that the internal pressure of the bag 120 increases. Therefore, the bag 120
Will cleave with a much greater deployment force than normal deployment force and will deploy more strongly than normal.

[0008] An object of the present invention is to provide an airbag in which, even when the upper surface of the module cover is closed for some reason when the bag is deployed, normal deployment is performed without excessively increasing the bag pressure. It is to provide a device. Another object of the present invention is to provide an airbag device that allows a bag to be largely deployed even if the upper surface of the module cover is closed for some reason when the bag is deployed.

[0009]

According to the present invention, there is provided an airbag apparatus comprising a bag, a module cover, and a holding member for holding the module cover. The module cover is
A frame portion extending from the back surface side of the upper surface, and a tear line formed on the back surface side of the upper surface, and being continuous or close to the tear line, outside the frame portion of the upper surface and of the tear line. The problem is solved by having an auxiliary tear line formed in the outer region.

As described above, the module cover has a tear line formed on the back surface side of the upper surface, and an auxiliary tear line formed on or outside the frame portion of the upper surface and outside of the tear line, continuously or close to the tear line. Since the upper surface of the module cover is closed for some reason when the bag is unfolded and the tear line formed on the back side of the upper surface of the module cover cannot be opened when the bag is deployed, the auxiliary tear line is opened. It is possible to release the increased bag pressure in the cover.

According to the second aspect of the present invention, there is provided an airbag apparatus including a bag, a module cover, and a holding member for holding the module cover. An upper surface, a frame portion formed to extend from the back surface side of the upper surface, and a tear line formed on the back surface side of the upper surface, and continuous or close to the tear line, outside the frame portion of the upper surface and The problem is solved by having an auxiliary tear line formed in a region outside the tear line, wherein the auxiliary tear line is formed thicker than the tear line.

That is, by forming the auxiliary tear line thicker than the tear line formed on the back surface side of the upper surface of the module cover, the auxiliary tear line does not break during normal deployment, and the tear line on the upper surface of the module cover is formed. It can be configured to cleave only when the occupant does not cleave, for example, because it is closed by an occupant.

[0013] Further, according to the third aspect of the present invention, there is provided an airbag apparatus including a bag, a module cover, and a holding member for holding the module cover. An upper surface, a frame portion formed to extend from the back surface side of the upper surface, and a tear line formed on the back surface side of the upper surface, and continuous or close to the tear line, outside the frame portion of the upper surface and This problem is solved by having an auxiliary tear line formed in an outer region of the tear line, wherein the auxiliary tear line is formed to be thinner on the tear line side and gradually thicker as the distance from the tear line side increases.

As described above, the auxiliary tear line is formed to be thinner on the tear line side and gradually thicker as the distance from the tear line side increases, so that the auxiliary tear line is
First, tear on the tear line side, and as the cleavage progresses outward, it becomes thicker, so it does not split sharply,
The module cover can be opened at an appropriate speed, and the bag can be deployed.

According to a fourth aspect of the present invention, there is provided an airbag apparatus including a bag, a module cover, and a holding member for holding the module cover. An upper surface, a frame portion formed by extending from the back surface side of the upper surface, and a tear line formed on the back surface side of the upper surface, and being continuous with or adjacent to the tear line, outside the frame portion of the upper surface. In addition, there is provided an auxiliary tear line formed in an outer region of the tear line, and the auxiliary tear line is formed by providing a continuous or intermittent thin portion in a direction away from the tear line side.

According to a fifth aspect of the present invention, there is provided an airbag apparatus including a bag, a module cover, and a holding member for holding the module cover, wherein the module cover has an upper surface and a lower surface. A frame formed extending from the back side of the upper surface, and a back side of the upper surface,
A first tear line formed in the vehicle width direction; and a second tear line formed along the inside of the frame portion continuously from an end of the first tear line, and continuous with the second tear line. Alternatively, the above problem is solved by having an auxiliary tear line formed close to and outside the frame portion of the upper surface and outside the second tear line.

As described above, the first tear line is formed on the module cover as the tear line in the vehicle width direction, and the second tear line is formed continuously from the end of the first tear line along the inside of the frame portion. In the case where the airbag is deployed, the auxiliary tear line is formed continuously or close to the second tear line, outside the frame portion on the upper surface, and outside the second tear line. Even when the upper surface is closed for some reason and the first tear line and the second tear line formed on the back surface side of the upper surface of the module cover cannot be split, the auxiliary tear line has been raised inside the module cover by splitting. Bag pressure can be released.

According to the present invention, there is provided an airbag apparatus comprising: a bag; a module cover; and a holding member for holding the module cover. A frame formed extending from the back side of the upper surface, and a back side of the upper surface,
A first tear line formed in the vehicle width direction; and a second tear line formed along the inside of the frame portion continuously from an end of the first tear line, and continuous with the second tear line. Alternatively, it has an auxiliary tear line formed near and outside the frame portion of the upper surface and outside the second tear line, and the auxiliary tear line is thicker than the first tear line or the second tear line. It is solved by being formed.

That is, by forming the auxiliary tear line thicker than the first tear line or the second tear line formed on the back surface side of the upper surface of the module cover,
The auxiliary tear line is configured not to be split during normal deployment, and to be split only when the first tear line or the second tear line on the upper surface of the module cover is not split due to, for example, being blocked by an occupant. it can.

Further, according to the present invention, there is provided an airbag apparatus comprising: a bag; a module cover; and a holding member for holding the module cover. An upper surface, a frame portion extending from the back surface of the upper surface, a first tear line formed in the vehicle width direction on the back surface of the upper surface,
A second tear line formed continuously along the inside of the frame portion from an end of the tear line; and a second tear line continuous or close to the second tear line, outside the frame portion on the upper surface and the second tear line. The problem is solved by having an auxiliary tear line formed in an outer region of the tear line, wherein the auxiliary tear line is formed to be thin on the second tear line side and gradually thicker toward the frame portion side.

As described above, the auxiliary tear line is formed to be thinner on the second tear line side and gradually thicker as the distance from the second tear line is increased, so that the auxiliary tear line is first formed on the second tear line side. Since the thickness increases as the tearing proceeds and the tearing proceeds outward, the module cover can be opened at an appropriate speed and the bag can be deployed without abrupt tearing.

Further, according to the present invention, there is provided an airbag apparatus comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover comprises: An upper surface, a frame portion formed extending from the back surface side of the upper surface, a first tear line formed in the vehicle width direction on the back surface side of the upper surface, and a continuous end portion of the first tear line. A second tear line formed along the inside of the frame portion, the second tear line being continuous with or adjacent to the second tear line, formed outside the frame portion on the upper surface and outside the second tear line. The problem is solved by having an auxiliary tear line, wherein the auxiliary tear line is formed by providing a continuous or intermittent thin portion from the side of the second tear line toward the frame portion.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an airbag device S of the present invention will be described.
, A preferred embodiment will be described. The module cover 20 of the airbag device S according to the present invention includes:
It comprises an upper surface 21 and a frame portion 22 formed to extend from the back surface side of the upper surface 21. A tear line 70 is formed on the back side. The tear line 70 is, for example,
The first tear line 71 is formed in the vehicle width direction, and the second tear line 72 is formed along the inside of the frame 21 continuously from the end of the first tear line 71.

An auxiliary tear line 73 is formed on the rear surface of the upper surface 21 of the module cover 20. The auxiliary tear line 73 is continuous with or close to the tear line 70, on the module cover upper surface 21 outside the frame 22,
Further, it is formed in a region outside the tear line 70.

It is preferable that the auxiliary tear line 73 be formed thicker than the tear line 70. Also,
It is preferable that the auxiliary tear line 73 is formed to be thinnest on the tear line 70 side and gradually thicker as the distance from the tear line 70 side increases.

The auxiliary tear line 73 of this embodiment is formed by, for example, providing a continuous or intermittent thin portion in a direction away from the tear line 70 side.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, but can be variously modified within the scope of the present invention.

FIGS. 1 to 4 show one embodiment of the present invention. FIG. 1 is a schematic exploded perspective view showing an example of an airbag apparatus, FIG. 2 is an explanatory view showing a module cover, FIGS. FIG. 4 is an explanatory view of the expanded state of the module cover of the present invention.

The airbag device S of this embodiment includes an inflator 50 and a retainer 30 for holding the inflator 50.
And the bag 10 which is folded by covering the gas ejection port 51 of the inflator 50, and the bag 10
0 and a bag ring 40 connected to the retainer 30 by the bag ring 40 and
And a module cover 20 that covers the inflator 50. The module cover 20 has a tear line 70 formed of a thin portion to be cleaved.

The bag 10 of this embodiment is constructed by folding a bag into a predetermined shape. A mounting hole 11 (FIG. 3) for mounting the inflator 50 is formed on the lower surface of the bag. An insertion hole (not shown) for inserting the connection bolt of the bag ring 40 is formed at a predetermined position.

As shown in FIG. 1, the module cover 20 of the present embodiment includes an upper surface portion 21 and a frame portion 22 extending downward from the upper surface portion 21. The frame portion 22 is formed so as to cover the bag 10 and the inflator 50. Also, on the upper surface portion 21 of the module cover 20,
A display unit 23 is provided. The display unit 23 includes, for example, a mark or logo indicating a vehicle type or the like, or “airbag”
Are displayed by printing or engraving.

In this embodiment, the display section 23 is formed in a circular shape. However, the display section 23 is not limited to this, and may be formed in other shapes such as a polygon. Further, it is needless to say that the display unit 23 may not be provided.

As shown in FIG. 2, a tear line 70 is formed on the back surface of the module cover 20 of this embodiment. The tear line 70 includes a first tear line 71 and a first tear line.
And a second tear line 72 continuous with the tear line 71.

The first tear line 71 is formed in the vehicle width direction (ie, in the left-right direction in FIG. 2), including the lower peripheral portion of the display unit 23. In addition, the second tear line 72
Are connected to both ends of the first tear line 71 and are formed along the inside of the frame portion 22. Although FIG. 2 shows a configuration in which the first tear line 71 and the second tear line 72 are provided, the shape of the tear line 70 is not limited to such an H-shape. A configuration in which only a U-shaped tear line formed along the line may be provided.

The auxiliary tear line 73 is formed on the side of the module cover 20 near the occupant. As shown in FIG. 2, the auxiliary tear line 73 of the present example includes a second tear line 72.
Is formed continuously from the end portion 72a of the module cover 20, outside the frame portion 22 of the module cover 20, and in an area outside the second tear line.

The auxiliary tear line 73 is formed thicker than the first tear line 71 or the second tear line 72. Accordingly, the auxiliary tear line 73 does not split during normal deployment, and splits only when the first tear line 71 and the second tear line 72 do not split due to being blocked by an occupant or the like.

The auxiliary tear line 73 is formed so that the portion adjacent to the end 72a of the second tear line 72 is the thinnest, and becomes gradually thicker as the distance from the end 72a increases. ing. With such a configuration, the auxiliary tear line 73 is first split at the end 72a side, and thereafter split at an appropriate speed toward the frame portion 22 side.

As described above, the auxiliary tear line 73 is formed to be thicker than the first tear line 71 or the second tear line 72, and the auxiliary tear line 73 is thickest on the second tear line 72 side. Is formed.

For example, the upper surface 2 of the module cover 20
1 and the frame portion 22 have the same thickness, the first tear line 71 is formed by forming the auxiliary tear line 73 from a shallower groove than the first tear line 71 or the second tear line 72. 71 or second tear line 72
Rather, the auxiliary tear line 73 can be made thicker.

The upper surface 21 of the module cover 20
If the frame portion 22 is thicker than the first portion, the first tear line 71 or the second tear line 72 and the auxiliary tear line 73 are formed from concave grooves having the same depth, so that the first tear line 71 or the second tear line 72 is formed from the concave groove. Tear line 71 or second tear line 72
Rather, the auxiliary tear line 73 can be made thicker. As described above, the tear portion 70 is formed according to the thickness of the upper surface portion 21 and the frame portion 22 of the module cover 20, and the first tear line 71, the second tear line 72, and the auxiliary tear line forming the tear portion 70 are formed. A difference in wall thickness is made between the wall thickness and the wall thickness.

As shown in FIG. 1, the retainer 30 of the present embodiment has an upper surface portion 31, a vehicle body side connection portion 33, and a module cover connection portion 35, which are integrally formed. A hole 32 for arranging the inflator 50 is formed in the center of the upper surface portion 31, and four connection holes 34 for attaching a bag ring are formed at predetermined positions outside the hole 32.

The vehicle-body-side connecting portion 33 is for connecting to a vehicle-body-side member (not shown) by a fixing tool 61 such as a screw or a rivet, and extends to two opposing positions on the side of the upper surface portion 31. A hole 37 for connecting with a fixing tool such as a screw is formed.

As shown in FIG. 1, the bag ring 40 of this embodiment includes an upper surface portion 41 in which a hole 42 for mounting the inflator 50 is formed, and a connecting bolt 43 extending from the upper surface portion 41 in one direction. It is formed in four places.

The inflator 50 according to the present embodiment is shown in FIGS.
As shown in the figure, a cylindrical explosive storage part 52, a plurality of gas outlets 51 formed at locations arranged in the bag 10 on the upper outer peripheral side of the explosive storage part 52, and an inflator 50
A mounting part 53 for mounting is formed,
The attachment portion 53 has a connection hole 54 formed therein.

The insertion hole of the bag 10, the connection hole 34 of the retainer 30, and the connection bolt 4 of the bag ring 40
3 and the connection hole 54 of the inflator 50 are formed at aligned positions.

In the airbag apparatus S having the above structure, the bag ring 40 is mounted in the bag 10, the connecting bolt 43 of the bag ring 40 is inserted through the insertion hole of the bag 10, and the retainer 30 and the inflator 50 are further connected. Assembling, inserting the connecting bolt 43 into the connecting hole 34 of the retainer 30 and the connecting hole 54 of the inflator 50,
At the rear side, the nut 62 is screwed with the connection bolt 43 and assembled integrally. Then, the module cover 20 and the retainer 30 are assembled and fixed with a fixing tool 63 such as a rivet.

Next, the operation of the airbag device S formed as described above will be described. Under normal conditions,
When the airbag device S is operated, the bag 10 is inflated, and the first tear line 71 or the second tear line 72 is inflated.
Is formed to be thinner, the first tear line 71 and the second tear line 72 of the module cover 20 are cleaved, and the bag 10 is operated to deploy.

On the other hand, for some reason, for example, by an occupant,
When the upper surface of the module cover 20 is closed when the bag 10 is unfolded, the first tear line 71 and the second tear line 72 of the module cover 20 do not break at a predetermined pressure, and the inside of the bag storage unit (the module cover 20) is opened. The pressure in (in) becomes higher than in normal deployment.

As shown in FIG. 3, an auxiliary tear line 73 formed on the module cover 20 on a surface different from the occupant side and set to be thicker than the first tear line 71 or the second tear line 72. Is formed, and the auxiliary tear line 73 is opened without being pressed by the occupant's body or the like. As a result, the pressure of the bag 10 is released, and the bag 10 can be deployed from the auxiliary tear line 73 in the direction in which the bag 10 escapes from the occupant side.

[0050]

As described above, according to the present invention, the tear line formed on the back surface side of the upper surface of the module cover,
Since an auxiliary tear line formed continuously or close to the outside of the upper frame portion and outside the tear line is provided, when the bag is deployed, the upper surface of the module cover is closed for some reason, and the upper surface of the module cover is closed. Even when the tear line formed on the back side of the module cannot be split, the auxiliary tear line is split, so that the increased bag pressure in the module cover can be released.

Further, by forming the auxiliary tear line thicker than the tear line formed on the back surface side of the upper surface of the module cover, the auxiliary tear line does not break during normal deployment, and the tear line on the upper surface of the module cover is formed. It can be configured to cleave only when the occupant does not cleave, for example, because it is closed by an occupant.

The auxiliary tear line is made thinner on the tear line side and gradually thicker as the distance from the tear line side increases, so that the auxiliary tear line is firstly split on the tear line side and thicker as the tearing proceeds outward. , The module cover can be opened at an appropriate speed and the bag can be deployed without abrupt tearing.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view showing an example of an airbag device according to the present invention.

FIG. 2 is an explanatory view showing a module cover according to the present invention.

FIG. 3 is an explanatory diagram of a deployed state of a module cover of the present invention.

FIG. 4 is an explanatory view of an expanded state of the module cover of the present invention.

FIG. 5 is an explanatory view of a conventional airbag device.

FIG. 6 is an explanatory diagram of a developed state of a conventional example.

FIG. 7 is an explanatory diagram of a developed state of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bag 11 Mounting hole 20 Module cover 21 Upper surface part 22 Frame part 30 Retainer 34 Connection hole 40 Bag ring 41 Upper surface part 42 Hole 43 Connection bolt 50 Inflator 51 Gas outlet 52 Explosive storage part 53 Mounting part 54 Connection hole 61 Fastener 62 Nut 63 Fastener 70 Tearline 71 First Tearline 72 Second Tearline 73 Auxiliary Tearline S Airbag Device

Claims (8)

[Claims] 1. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. And a tear line formed on the back surface side of the upper surface, and having an auxiliary tear line formed continuously or adjacent to the tear line, outside the frame portion on the upper surface and outside the tear line. An airbag device characterized by the above. 2. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. Frame portion, and a tear line formed on the back side of the upper surface, comprising an auxiliary tear line continuous or adjacent to the tear line, formed outside the frame portion of the upper surface and outside the tear line. The airbag device, wherein the auxiliary tear line is formed thicker than the tear line. 3. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. Frame portion, and a tear line formed on the back side of the upper surface, comprising an auxiliary tear line continuous or adjacent to the tear line, formed outside the frame portion of the upper surface and outside the tear line. The airbag device, wherein the auxiliary tear line is formed to be thinner on the tear line side and gradually thicker as the distance from the tear line side increases. 4. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a rear surface of the upper surface. Frame portion, and a tear line formed on the back side of the upper surface, comprising an auxiliary tear line continuous or adjacent to the tear line, formed outside the frame portion of the upper surface and outside the tear line. The airbag device, wherein the auxiliary tear line is formed by providing a continuous or intermittent thin portion in a direction away from the tear line side. 5. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. A first tear line formed in the vehicle width direction on the back side of the upper surface;
A second tear line formed continuously along the inside of the frame portion from an end of the first tear line, the second tear line being continuous or close to the second tear line, outside the frame portion of the upper surface, and An airbag device having an auxiliary tear line formed in a region outside the second tear line. 6. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. A first tear line formed in the vehicle width direction on the back side of the upper surface;
A second tear line formed continuously along the inside of the frame portion from an end of the first tear line, the second tear line being continuous or close to the second tear line, outside the frame portion of the upper surface, and An auxiliary tear line formed in an outer region of the second tear line, wherein the auxiliary tear line is the first tear line or the second tear line;
An airbag device characterized by being formed thicker than the tear line. 7. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. A first tear line formed in the vehicle width direction on the back side of the upper surface;
A second tear line formed continuously along the inside of the frame portion from an end of the first tear line, the second tear line being continuous or close to the second tear line, outside the frame portion of the upper surface, and An auxiliary tear line formed in an outer region of the second tear line, wherein the auxiliary tear line is thin on the second tear line side;
An airbag device characterized by being formed gradually thicker toward a frame portion side. 8. An airbag device comprising a bag, a module cover, and a holding member for holding the module cover, wherein the module cover is formed to extend from an upper surface and a back surface of the upper surface. A first tear line formed in the vehicle width direction on the back side of the upper surface;
A second tear line formed continuously along the inside of the frame portion from an end of the first tear line, the second tear line being continuous or close to the second tear line, outside the frame portion of the upper surface, and An auxiliary tear line formed in an outer region of the second tear line, wherein the auxiliary tear line is formed by providing a continuous or intermittent thin portion from the second tear line side toward the frame portion. Characteristic airbag device.