JP3463545B2 - 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 a passenger airbag device for protecting a passenger in a vehicle such as an automobile.

[0002]

2. Description of the Related Art As an airbag device for a passenger seat of this type, for example, there is an airbag assembly described in Japanese Patent No. 2523406. According to the airbag assembly described in this publication, gas is directly ejected from the inflator into the airbag. Therefore, when the airbag is deployed, the airbag inside the case of the assembly tends to once project toward the occupant due to the ejection force of the gas, and then to deploy to the final shape. As a result, the airbag may come into contact with the occupant even before the deployment of the airbag is completed.

Therefore, in the past, in consideration of such a situation,
For example, as described in Japanese Patent Laid-Open No. 9-48307, an airbag device for a passenger seat including a small bag (inner bag) inside an airbag is considered. In the passenger airbag apparatus described in this publication, the inner bag is sewn inside the airbag, and thereby the inner bag is fixed to the airbag. for that reason,
In this passenger airbag device, the gas ejected from the gas generator is once introduced into the inner bag and then gradually supplied into the airbag. Therefore, according to this device, the airbag is prevented from projecting to the occupant side before the completion of deployment.

[0004]

However, in the conventional passenger airbag apparatus with an inner bag as described in each of the above publications, the inner bag must be sewn inside the airbag. Therefore, a sewing process for the inner bag is required. Moreover, since the inner bag is provided inside the airbag, it may be necessary to turn the airbag over when sewing and return it to the original state after sewing. Therefore, the assembly work of the airbag device becomes complicated. Moreover, when the airbag and the inner bag are deployed, the seams thereof are broken by the momentum of the gas ejected from the inflator, and the inner bag may come off to fail to achieve the initial purpose of providing the inner bag.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the assembling workability and to effectively utilize the function of the inner bag. An object is to provide an airbag device.

[0006]

In order to achieve the above-mentioned object, in the invention described in claim 1, an inner bag is provided in the airbag, and gas ejected from the inflator is introduced into the airbag via the inner bag. In the passenger side airbag device, the airbag and the inner bag are separately formed, and each of the airbags has a mounting portion composed of a pair of flaps having a plurality of through holes. The inner bag includes a mounting portion formed of a pair of flaps having a plurality of through holes corresponding to the through holes of the airbag, and the plurality of protrusions integrally arranged on the inflator have corresponding through holes of the flaps. was inserted and is inserted a plurality of projections of said inflator into a through hole provided in the airbag case, the air bag, the In'naba
And the inflator in the airbag case
The gist of the work is to fix it at the same time .

According to this structure, the gas ejected from the inflator is once introduced into the inner bag and then supplied into the airbag. Therefore, the deployment speed of the airbag is reduced, and the contact of the airbag with the occupant before the completion of the deployment is suitably suppressed. Moreover, the airbag is provided with a pair of flaps each having a plurality of through holes, and the inner bag is provided with a pair of flaps having a plurality of through holes corresponding to the through holes of the airbag. The corresponding through holes of each flap are inserted into the plurality of protrusions that are integrally arranged in the air bag, and the plurality of protrusions of the inflator are inserted into the through holes provided in the airbag case.
The airbag, inner bag, and inflator.
Since the inner bag is fixed to the airbag case at the same time , it is not necessary to sew the inner bag to the airbag, and the assembling workability of the passenger side airbag device is improved.

[0008]

[0009]

Further, since there is no need to sew the inner bag to the airbag before deployment end of the air bag and the inner bag, has expired sewn portion by the pressure of the ejected gas from the inflator, the inner bag comes off That is unrelated. Therefore, the reliability of the device is improved.

[0011]

Further , the work of attaching the inflator to the airbag case becomes easy, and the assembling property can be improved. In the invention described in claim 2, in the front passenger seat air bag apparatus according to claim 1, the projections disposed on the inflator has a male thread portion, the respective protrusion, said air bag case The gist of the invention is that it is fixed with a nut from the outside of the airbag case after being inserted into the through hole.

According to this structure, the inflator, the airbag and the inner bag are fixed by screwing the nuts, so that the assembling work can be performed more easily.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1 and FIG. 2, an airbag device 11 for a passenger seat includes an airbag 12 that expands and inflates to protect an occupant, and the airbag 12 thereof.
An inner bag 13 arranged inside, an inflator 14 for injecting gas, and an air bag case 15 for housing them are provided. Then, the passenger seat airbag device 11 is assembled in the instrument panel 54 and covered with an airbag cover 55.

The airbag 12 is a bag body 2 which is partially opened.
1 and a pair of flaps 22 continuously formed at the open end of the bag body 21, and each flap 22 is provided with a plurality of through holes 23.

The inner bag 13 is formed to be smaller than the airbag 12, and has a bag body 31 that is partially opened like the airbag 12, and a pair of flaps formed continuously at the open ends of the bag body 21. 32, each of which is provided with a plurality of through holes 33 corresponding to the through holes 23 of the airbag 12. Further, communication holes 34 for supplying gas to the airbag 12 are provided on both sides of the bag body 31. The airbag 12 is provided with an exhaust hole (not shown) for releasing gas to the outside after the airbag 12 is deployed.

The inflator 14 is formed in a substantially cylindrical shape,
As shown in FIG. 2, a gas generating agent (not shown) is accommodated in the inflator case 41, and the gas generating agent is thermally decomposed at the time of collision, and the decomposed gas causes the bag bodies 21 and 31 in the inflator case 41 to be separated. The gas is ejected into the inner bag 13 from the gas ejection port 42 provided on the side. The gas ejection ports 42 are formed at a plurality of locations on the peripheral wall of the inflator case 41 at intervals along the axial direction thereof. Further, a stud bolt 43 as a protrusion having a plurality of male screw portions corresponding to the through holes 23 and 33 is integrally fixed to the inflator case 41 at an axially symmetrical position of the gas ejection port 42 in the inflator case 41. ing.

The airbag case 15 has a substantially box-like shape with one surface opened, and a plurality of through holes 51 through which the stud bolts 43 can be inserted are provided through a wall facing the opening surface. A nut 52 is screwed into each stud bolt 43 from the outside of the airbag case.

Next, a procedure for assembling the passenger seat airbag apparatus 11 of the present embodiment thus constructed will be described. As shown in FIG. 2 and FIG. 3, first, the flaps 32 of the inner bag 13 cover the inflator 14 from the side of the gas ejection port 42, and the through holes 33 formed in both the flaps 32 are connected to the stud bolts. It is inserted in 43. Then, the stud bolts 43 are also inserted into the through holes 23 of the flaps 22 of the airbag 12, respectively. As mentioned above,
Inner bag 13 for one stud bolt 43
The through holes 33 of the both flaps 32 and the through holes 23 of the both flaps 22 of the airbag 12 are inserted to fit the respective flaps 32,
22 is polymerized.

Next, in this state, the inflator 14 is housed in the airbag case 15. At this time, attach each stud bolt 43 of the inflator 14 to the airbag case 1
5 through each of the through holes 51. Then, nuts 52 are screwed onto the stud bolts 43 protruding from the airbag case 15 to fix the inflator 14 to the airbag case 15. As a result, each stud bolt 43
The flaps 22 and 32 of the airbag 12 and the inner bag 13 which are inserted into the bag are sandwiched and fixed between the inflator 14 and the airbag case 15.

Then, as shown in FIG. 4, the air bag 12 and the inner bag 13 are attached to the air bag case 15.
Fold inside and store. Note that, in FIG. 4, the inner bag 13 is shown by a chain double-dashed line in order to facilitate understanding of the relationship between the airbag 12 and the inner bag 13.

The passenger seat airbag device 11 thus assembled is fixedly arranged on the upper portion of the instrument panel 54 facing the windshield 53 in a vehicle such as an automobile, and the passenger bag airbag 55 is provided by an airbag cover 55. The opening of the device 11 is covered.

Next, the deployment operation of the passenger seat airbag apparatus 11 of this embodiment will be described. When the gas is ejected from the gas ejection port 42 of the inflator 14, as shown in FIG. 5, the gas is first introduced into the inner bag 13, and the inner bag 13 is inflated and expanded. Next, the gas is supplied into the airbag 12 through the communication holes 34 on both sides of the inner bag 13, as indicated by the arrow in the figure. Then, the airbag 12 completes its deployment as shown in FIG.

The operation and effect of this embodiment described in detail above will be summarized below. The gas ejected from the gas ejection port 42 of the inflator 14 is once introduced into the inner bag 13 and then the communication hole 34.
Is supplied into the airbag 12. Therefore, the deployment speed of the airbag 12 to the occupant side is reduced, and it is possible to preferably suppress the contact of the airbag 12 with the occupant before the completion of the deployment. Moreover, the airbag 12 and the inner bag 13 are provided with the flaps 22, 32 at the respective open ends.
Is supported by the stud bolts 43, so it is not necessary to sew the inner bag 13 to the airbag 12. Therefore, the workability of assembling the passenger airbag device 11 can be improved.

The inner bag 13 is not sewn to the airbag 12, but is supported by the stud bolts 43 integrated with the inflator case 41. Therefore, the mounting strength of the inner bag 13 is high, and there is no fear that the inner bag 13 will come off due to the gas pressure from the inflator 14. Moreover, the flaps 22 and 3 of both bags 12 and 13 are
The flaps 22 and 32 are sandwiched between the inflator 14 and the airbag case 15 while the through holes 23 and 33 of 2 are supported by the stud bolt 43.
Therefore, it is possible to improve the attachment strength of the bags 12 and 13 and sufficiently withstand the gas pressure. As described above, in this embodiment, the reliability of the passenger seat airbag device 11 can be improved.

During the assembling work of the passenger airbag device 11, the inflator 14 supporting both the bags 12 and 13 is housed and fixed in the airbag case 15, and the stud bolts 43 are attached to the airbag case 15. The nut 52 is inserted into the stud bolt 43 while being inserted into the through hole 51.
The airbag 12 and the inner bag 1 are screwed together.
3 and the inflator 14 can be assembled and fixed to the airbag case 15 at the same time. Therefore, the workability of assembling can be further improved.

The above embodiment may be modified as follows, and in that case, the same operation and effect can be obtained. In the above embodiment, the communication holes 34 of the inner bag 13 are provided on both sides of the inner bag 13, but they may be provided at other positions such as the vertical position.

In the above embodiment, the stud bolt 43 is arranged on the inflator 14 and the inflator 14, the airbag 12 and the inner bag 13 are fixed to the airbag case 15 by the nut 52. Instead of a simple rod having a hole, the rod is fixed on the outside of the case by a split pin inserted into the hole.

[0029]

According to the invention described in claim 1, the gas ejected from the inflator is supplied into the airbag through the inner bag. Therefore, the deployment speed of the airbag is reduced, and the contact of the airbag with the occupant before the completion of the deployment can be appropriately suppressed. Moreover, the airbag is provided with a pair of flaps each having a plurality of through holes, and the inner bag is provided with a pair of flaps having a plurality of through holes corresponding to the through holes of the airbag. The corresponding through holes of the flaps are inserted into the plurality of protrusions that are integrally arranged in the air bag, and the plurality of protrusions of the inflator are inserted into the through holes provided in the airbag case, and the airbag, the inner bag, And inf
Since the vibrator is assembled and fixed to the airbag case at the same time , it is not necessary to sew the inner bag to the airbag, and the workability of assembling the airbag apparatus for the passenger seat can be improved.

Further, since there is no need to sew the inner bag to the airbag, upon deployment of the air bag and the inner bag, it has expired sewn portion by the pressure of the gas, since there is no fact that the inner bag is out, of the apparatus The reliability can be improved.

Further , the work of attaching the inflator to the airbag case becomes easy, and the assembling property can be improved. According to the second aspect of the invention, the inflator, the airbag and the inner bag are fixed by screwing the nuts, so that the assembling work can be performed more easily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment according to the present invention.

FIG. 2 is a side sectional view showing a development completed state of the same embodiment.

3 is a side sectional view showing a part of FIG. 2 in an enlarged manner.

FIG. 4 is a side sectional view schematically showing an arrangement state of the same embodiment.

FIG. 5 is a side sectional view schematically showing an initial state of deployment of the same embodiment.

[Explanation of symbols]

11 ... Air bag device for passenger seat, 12 ... Air bag, 1
3 ... Inner bag, 14 ... Inflator, 15 ... Airbag case, 22, 32 ... Flap, 23, 33 ... Through hole, 43 ... Stud bolt as a protrusion, 51 ... Through hole, 52 ... Nut.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-263203 (JP, A) JP-A-10-53094 (JP, A) JP-A-8-282426 (JP, A) JP-A-9- 48307 (JP, A) JP 10-203280 (JP, A) Special table 9-511716 (JP, A) Special table 4-503489 (JP, A) Patent 2523406 (JP, B2) US patent 5632506 ( (US, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (2)

(57) [Claims] 1. An airbag apparatus for a passenger seat, comprising an inner bag inside the airbag, and supplying gas ejected from an inflator into the airbag via the inner bag, wherein the airbag and the inner bag are provided. And separately formed,
The airbag includes a mounting portion including a pair of flaps each having a plurality of through holes, and the inner bag includes a mounting portion including a pair of flaps having a plurality of through holes corresponding to the through holes of the airbag. Corresponding through holes of each of the flaps are inserted into a plurality of protrusions integrally arranged on the inflator, and the plurality of protrusions of the inflator are inserted into through holes provided in the airbag case, air
In front of the bag, the inner bag, and the inflator
An airbag device for the passenger seat that is assembled and fixed to the airbag case at the same time . 2. The airbag apparatus for a passenger seat according to claim 1, wherein each protrusion provided on the inflator has a male screw portion, and each protrusion is formed in a through hole of the airbag case. An airbag device for the passenger seat that is fixed with nuts from the outside of the airbag case after it has been inserted.