JPH05178146A - Air bag device for automobile - Google Patents

Abstract

PURPOSE:To reduce manufacturing manhours without forming the suspension cord of an air bag device of another member and secure stable quantity of expansion and provide an air bag device for an automobile, which is affected only a little by the heat of the gas blown out from an inflater. CONSTITUTION:An air bag device is formed in such a way that a base section side cloth member 12 whose base section is fixed to an air bag fitting section 3 and a protection side cloth member 13 which is arranged facing the front side of a seat from a bag which is expanded by the gas G introduced inside and a suspension cord 14 is formed by partially threading a part of string constituting a base side cloth member 12 and the protection side cloth member 13 between both members 12 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile airbag device.

[0002]

2. Description of the Related Art As a technique of this type, for example, there is one as shown in FIG. 10 (Japanese Utility Model Laid-Open No. 64-30764). That is, reference numeral 1 in the drawing denotes an airbag device, and the airbag device 1 is provided with a base portion 2a of a cloth material having a base portion 2a fixed to an airbag mounting portion 3 and a front side 4a of a seat 4. The protection side cloth member 5 of the arranged cloth material is sewn with the sewing means 6
Is formed into a bag shape. This airbag device 1
Is normally folded small and is inserted into the through hole 2b formed in the base side cloth member 2 inflator 7
When a gas G is generated by an emergency signal (not shown), the gas G is introduced into the inside of the airbag device 1 to be inflated and sewn to each of the base side cloth member 2 and the protection side cloth member 5. Proximal end 8 fixed by means 6
The hanging string 8 of cloth material having a and 8b regulates the inflating shape of the airbag device 1 when the airbag device 1 is inflated. Incidentally, reference numeral 9 is the airbag device 1
The main room 10 is a sub room.

[0003]

However, in such a conventional structure, the airbag device 1 is arranged toward the base side cloth member 2 of the cloth material and the front side 4a of the seat 4. Since the protective cloth member 5 of the cloth material and the hanging string 8 are formed by the sewing means 6, the man-hours of the sewing means 6 are required, which also causes a cost increase. Further, since the hanging string 8 is made of a cloth material different from each of the base side cloth member 2 and the protection side cloth member 5, a management man-hour is required. Further, if the material of the hanging string 8 cannot be made uniform, the amount of expansion will be different for each airbag device 1, so it is necessary to make the material uniform in order to secure a stable amount of expansion. Further, since the heat of jetting of the gas G generated from the inflator 7 is high, it is necessary to select a place where the hanging string 8 is arranged, which is less affected by the heat, and a great number of man-hours are required to decide this position. ..

The present invention has been made in view of the above-mentioned conventional problems, and reduces the man-hours and secures a stable inflation amount without forming the hanging strap of the airbag device as a separate member.
It is an object of the present invention to provide an automobile airbag device that is less affected by the gas heat emitted from an inflator.

[0005]

As an automobile airbag device of the present invention, a base side cloth member having a base portion fixed to an airbag mounting portion, and a protective side cloth member arranged toward the front side of a seat. Is formed into a bag shape by a member and is inflated by a gas introduced into the inside thereof, and a part of the yarn forming each of the base side cloth member and the protection side cloth member is partly between the both members. It is characterized in that a hanging string is formed by passing a thread to the.

Further, the threads forming the base side cloth member and the protection side cloth member are made of a non-breathable resin thread such as a nylon material, and the thread constituting the hanging string is made of a breathable resin thread such as an aramid material. Become.

Further, the thickness ratio between the threads forming the base side cloth member and the protection side cloth member and the thread forming the hanging string is 1: 2 to 4, and the base side cloth member and the protection side are When the thread forming each of the cloth members is about 420 denier, the thread forming the hanging string is about 840 denier, the thread forming each of the base side cloth member and the protection side cloth member is about 210 denier, Approximately 420 threads that make up the hanging string
The yarn constituting the denier, the base side fabric member and the protective side fabric member is about 210 denier and the yarn constituting the hanging string is about 840 denier.

Further, the central portion of the protective cloth member and the air bag mounting portion are held by the belt member, and the left and right portions of the protective cloth member except the central portion are inflated by the gas introduced therein. After that, the band member is cut by gas pressure to expand the central portion.

[0009]

[Operation] According to this structure, when a gas ejection trigger of the inflator is given, such as when a collision is detected, gas is ejected from the inflator, and all of them are first sacked by the base side cloth member and the protection side cloth member. A yarn that is inflated by being introduced into the air bag body that is formed in a shape and partially passes between the two parts of the base side cloth member and the protection side cloth member The amount of expansion of the main chamber is determined by the hanging cord formed by the above, and then the sub chamber is expanded by ejecting gas to the side. Since this hanging string is made of the same material as the base side cloth member and the protection side cloth member, the setting of the loom becomes easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings, in which the same or equivalent parts as those of the conventional example are designated by the same reference numerals.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4, reference numeral 11 denotes an automobile airbag device, and the automobile airbag device 11 includes:
The base portion 12a includes a base side cloth member 12 fixed to the airbag mounting portion 3 and a protective side cloth member 13 arranged toward the front side 4a (FIG. 6) of the seat 4. Then, in a so-called double weave in which the base side cloth member 12 and the protection side cloth member 13 are formed from the weaving stage by a conventionally known jacquard weave, from a part of the base side cloth member 12 to the protection side cloth member 13. By passing the yarn toward the weaving stage, the yarn has the function of the hanging string 14.

The threads of the hanging string 14 are passed at a pitch of, for example, about 50 with respect to a width of 80 mm. Then, as shown in FIG. 5, the airbag device 11 before inflation.
Is 720 mm, the length of the base side cloth member 12 is 170 mm from the position where the diameter of the base side cloth member 12 is 400 mm to the position where the diameter of the protection side cloth member 13 is 60 mm.

The threads forming the base-side cloth member 12 and the protection-side cloth member 13 are made of a non-breathable resin thread such as a nylon material, and the thread constituting the hanging strap 14 is made of an air-permeable material such as an aramid material. Made of resin thread.

Further, the ratio of the thickness of the thread forming each of the base side cloth member 12 and the protection side cloth member 13 to the thread forming the hanging string 14 is 1: 2 to 4. For example, when the thread forming each of the base side cloth member 12 and the protection side cloth member 13 is about 420 denier, the thread forming the hanging string 14 is about 840 denier, or the base side The thread constituting each of the cloth member 12 and the protection side cloth member 13 is set to about 210 denier, and the hanging string 1
4 is about 420 denier, or each of the base side cloth member 12 and the protective side cloth member 13 is about 210 denier, and the hanging strap 1
The yarn constituting No. 4 has about 840 denier.

The air bag device 11 is normally folded small. Then, when a gas ejection trigger is given to the inflator 7 such as by detecting a collision, the gas G is emitted from the inflator 7 inserted into the through hole 12b formed in the base side cloth member 12 by an emergency signal (not shown). When generated, all of the gas G is first introduced into the inside of the airbag device 11 by being introduced into the inside formed into a bag shape by the base side cloth member 12 and the protection side cloth member 13 so that the main chamber 9 And the base side cloth member 12 is expanded.
Also, when the airbag device 11 is inflated, the suspension cord 14 formed by partially passing the yarn between the members 12 and 13 from a part of the yarn forming each of the protection side cloth member 13 The inflation shape of the main chamber 9 of the airbag device 11 is regulated, and then the gas is ejected to the side so that the sub chamber 10
Expands.

The main chamber 9 expands in a direction sufficient to absorb the secondary collision energy of the occupant. Since the hanging string 14 is made of the same material as the base side cloth member 12 and the protection side cloth member 13, the loom can be easily set.

The threads forming the base-side cloth member 12 and the protection-side cloth member 13 are made of a non-breathable resin thread such as a nylon material, and the threads constituting the hanging string 14 are made of an air-permeable material such as an aramid material. By using the resin thread, the influence of the heat of the gas G generated from the inflator 7 can be avoided, and the degree of freedom in setting the thread is increased.

A second embodiment of the present invention will be described with reference to FIGS. This embodiment is different from the first embodiment in that the formation position of the hanging cord is extremely far from the center. That is, the central portion 13a of the protection side cloth member 13 and the airbag mounting portion 3 via the base side cloth member 12 are held by the band member 20 that is a hanging string and introduced into the inside by the inflator 7. With the gas G, the left and right sub-chambers 10 other than the central portion 13a of the protection side cloth member 13 are first expanded. Therefore, the occupant 21 can be sufficiently held from the left and right.

Thereafter, the inner pressure of the generated gas G rises, the band member 20 is cut, the central portion 13a begins to expand, and the forward movement of the occupant can be prevented.

[0020]

As an automobile airbag device of the present invention, a bag is constituted by a base side cloth member having a base portion fixed to the airbag mounting portion and a protection side cloth member arranged toward the front side of the seat. Formed into a shape and expanded by a gas introduced thereinto, and a thread is partially passed between the base side cloth member and the protection side cloth member, respectively, from a part of the thread. In addition, a thread forming each of the base side cloth member and the protection side cloth member is made of a non-air-permeable resin thread such as a nylon material and is hung. A thread constituting a string is made of a breathable resin thread such as an aramid material, and further, a thread forming each of the base side cloth member and the protection side cloth member, and a thread forming a hanging string. The thickness ratio of 1: 2 to 4 When the thread forming the base side cloth member and the protective side cloth member is about 420 denier, the thread forming the hanging string is about 840 denier, and the base side cloth member and the protecting side cloth member are formed. The thread for forming the hanging string is about 210 denier, the thread for forming the hanging string is about 420 denier, the thread for forming the base side cloth member and the protecting side cloth member is about 210 denier, and the thread for forming the hanging string is about 210 denier. 840 denier, and further, the central portion of the protective side cloth member and the airbag mounting portion are held by a belt member, and left and right excluding the central portion of the protective side cloth member by the gas introduced therein. The first part is inflated, and then the band member is cut by the gas pressure to inflate the central part. Is given, gas is ejected from the inflator, and all of the gas is inflated by being first introduced into the inside of the air bag body formed into a bag shape by the base side cloth member and the protection side cloth member, The amount of expansion of the main chamber is determined by the hanging cord formed by partially passing the yarn between the base side cloth member and the protection side cloth member partially between the members, and then the lateral direction The sub-chamber expands when gas is ejected to the suspension chamber, and the hanging strap is made of the same material as the base side cloth member and the protective side cloth member, so that the loom can be easily set and the hanging strap of the airbag device can be used. The number of steps can be reduced and a stable expansion amount can be secured without forming a separate member, and the airbag device for an automobile can be less affected by gas heat ejected from the inflator.

[Brief description of drawings]

FIG. 1 is a sectional view according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a relationship between a base side cloth member and a protection side cloth member of FIG.

FIG. 3 is an enlarged perspective view of a portion A of FIG.

FIG. 4 is a front view of the airbag device of FIG. 1 before being inflated.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a plan view according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing the relationship between the base side cloth member and the protection side cloth member of FIG.

FIG. 8 is a cross-sectional view taken along the plane in the initial stage of gas generation in FIG.

9 is a sectional view of the sub chamber of FIG. 8 in the most expanded state.

FIG. 10 is a side view of a conventional example.

[Explanation of symbols]

 1 Airbag device 11 Airbag device 2 Base side cloth member 12 Base side cloth member 3 Airbag mounting part 5 Protective side cloth member 13 Protective side cloth member 7 Inflator 8 Hanging string 14 Hanging string 20 Hanging string 9 Main room 10 Sub-compartment

Claims (7)

[Claims] 1. A gas which is formed in a bag shape and is introduced into the inside by a base side cloth member having a base fixed to an airbag mounting portion and a protection side cloth member arranged toward the front side of the seat. And a suspending cord is formed by partially passing a thread between the base-side cloth member and the protection-side cloth member partially between the members so as to be expanded. Automotive airbag device. 2. Threads constituting each of the base side cloth member and the protection side cloth member are made of non-air-permeable resin thread such as nylon material, and threads forming the hanging string are made of air-permeable resin thread such as aramid material. The airbag device for an automobile according to claim 1. 3. The automobile according to claim 1, wherein the thickness ratio of the thread forming each of the base side cloth member and the protection side cloth member to the thread forming the hanging string is 1: 2 to 4. Airbag device. 4. The airbag device for an automobile according to claim 3, wherein the thread forming each of the base side cloth member and the protective side cloth member is about 420 denier, and the thread forming the hanging string is about 840 denier. 5. The airbag device for an automobile according to claim 3, wherein the yarns forming the base side cloth member and the protective side cloth member each have a diameter of about 210 denier, and the thread forming the hanging cord has a length of about 420 denier. 6. The airbag device for an automobile according to claim 3, wherein the thread forming the base side cloth member and the protective side cloth member each has a diameter of about 210 denier, and the thread forming the hanging string has a length of about 840 denier. 7. The left and right parts of the protective side cloth member except the central part are first inflated by a band member that holds the central part of the protective side cloth member and the airbag mounting part. The airbag device for an automobile according to any one of claims 1 to 6, wherein the belt member is cut by a gas pressure to inflate the central portion.