JPH08119053A - Air bag device and its manufacture - Google Patents

Abstract

PURPOSE: To facilitate the assembly of an air bag device for front passenger seat. CONSTITUTION: A stepped part 31 and a second stepped part 33 opposed to the stepped part 31 are formed in an integral retainer of which upper side is opened. Also a locking claw part for locking an air bag 17 and a close-fit piece part 61 fitted closely between the stepped part 31 and the second stepped part 33 are formed in a mid retainer 16. The mid retainer 16 is inserted from an upper side case opening part 22 into the retainer 14 under tilted condition, and rotated inside the retainer 14 so as to fit a close-fit piece part 61 closely between the stepped part 31 and the second stepped part 33. Thus, by close fitting, the mid retainer and air bag 17 can be installed easily on the retainer 14. The number of part items can be reduced so as to reduce the production cost.

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 in a vehicle, which is mounted on an instrument panel of an automobile, for example.

[0002]

2. Description of the Related Art Conventionally, for example, an airbag device described in Japanese Patent Laid-Open No. 6-24285 is known.

This airbag device is mounted on an instrument panel or the like in order to protect an occupant in a passenger seat of an automobile, and includes an inflator for injecting gas and a bag-shaped airbag for inflating and expanding with the gas. Is equipped with. The inflator is housed in a lower retainer that serves as a pressure container with an open upper side, and the airbag is
It is stored in a folded state in an upper retainer that opens at the top and bottom. Further, a mid retainer having a through hole through which gas is inserted is attached between the upper retainer and the lower retainer, and the upper retainer, the mid retainer and the lower retainer are connected to each other by bolts.

When an automobile crashes, a high-temperature and high-pressure gas is injected from the inflator, and this gas is introduced into the inside of the airbag through the through hole of the mid retainer, and the airbag is inflated and expanded. However, it is designed to protect passengers in the passenger seat.

However, this Japanese Laid-Open Patent Publication No. 6-24285.
In the airbag device described in the publication, an upper retainer, a lower retainer, and the like are required, and the number of parts is large, and a work process for connecting the upper retainer, the mid retainer, and the lower retainer is required, which increases the manufacturing cost. I have a problem.

Further, for example, as described in Japanese Patent Application Laid-Open No. 6-8784, a so-called deep-drawing integral type case having an open upper side is provided, and the inflator is housed on the bottom side inside the case. There is known an airbag device in which a folded airbag is stored on the opening side inside the case.

However, in such an air bag device, when the mid retainer is not provided between the inflator and the air bag, the air bag is appropriately separated from the inflator for injecting the high temperature and high pressure gas by a predetermined dimension. It is difficult to hold in position. Further, when the mid retainer is provided between the inflator and the airbag, a complicated work of fixing the mid retainer with a bolt at an intermediate position inside the case is required, which causes a problem such as an increase in manufacturing cost of the airbag device. have.

[0008]

As described above, in the structure in which the inflator and the airbag are housed in separate cases, there is a problem that the number of parts and the work process increase, and the manufacturing cost increases. There is. Further, in the configuration provided with the integral type case for accommodating the inflator and the airbag, there is a problem that the work of assembling the mid retainer provided between the inflator and the airbag is complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an airbag device which can be easily assembled and can reduce the manufacturing cost, and a method of manufacturing the airbag device.

[0010]

An airbag apparatus according to claim 1, wherein an inflator for injecting gas, an airbag for inflating and expanding by the gas ejected by the inflator, a case for accommodating the inflator and the airbag. And a partition body disposed between the inflator and the airbag, and a step portion with which the partition body abuts is formed in the case by expanding the diameter toward the inflator side. The body is provided with an airbag mounting portion for mounting the airbag and an abutting portion for abutting a step portion of the case.

According to a second aspect of the present invention, there is provided an inflator which injects gas, an airbag which is inflated and expanded by the gas ejected by the inflator, and an inflator which communicates with the outside through an opening formed in the case. Between an inflator storage chamber for storing the inflator, and an inflator storage chamber communicating with the inflator storage chamber via a communication portion for storing the airbag, and between the inflator and the airbag. The partition body is provided, and in the case, a pair of stepped portions facing each other through the communication portion is formed to have a diameter enlarged toward the inflator storage chamber side. An air bag mounting portion for mounting the air bag, and a pair of contact portions for contacting the stepped portion of the case.

According to a third aspect of the present invention, in the airbag apparatus according to the second aspect, the case has a second portion that faces the inflator storage chamber side of the stepped portion and expands toward the airbag storage chamber side. Is formed, and the partition body is provided with a second contact portion that comes into contact with the second step portion.

The airbag device according to a fourth aspect is the airbag device according to the second or third aspect, in which the airbag mounting portion of the partition wall body is inserted and locked through an insertion portion formed in the airbag. It is provided with a claw portion.

According to a fifth aspect of the method of manufacturing an airbag device, an inflator for injecting gas, an airbag for inflating and expanding by the gas ejected by the inflator, and an outside communicated through a case opening formed with an opening. An inflator storage chamber for storing the inflator, an airbag storage chamber for storing the airbag in communication with the inflator storage chamber via a communication portion, and a pair of stepped portions facing each other via the communication portion. Using the formed integral case and a partition body arranged between the inflator and the airbag, the partition body is attached to the case with the airbag attached to the partition body. Through the, and then, the partition wall body, while being inclined with respect to the communication portion, is inserted between the pair of step portions, then, A partition wall member, by rotating the parallel form to the communication unit, the is to abut on the step portions.

[0015]

In the airbag device according to the first aspect of the present invention, the accommodated airbag is held at an appropriate position separated from the inflator by the partition wall body disposed between the inflator and the airbag. Then, the partition wall body to which the airbag is attached expands in diameter toward the inflator side and abuts on the stepped portion formed on the case, and the movement toward the airbag side is prevented.

According to the second aspect of the present invention, since the inflator and the airbag are housed in the integrated case, the number of parts and the number of assembling steps are reduced, and the manufacturing cost is reduced. Then, the accommodated airbag is held at an appropriate position separated from the inflator by the partition wall body disposed between the inflator and the airbag. Further, the partition wall body to which the airbag is attached is expanded in diameter toward the inflator side and held in contact with a pair of stepped portions formed in the case, and is prevented from moving toward the airbag side.

In the airbag device according to a third aspect of the present invention, in addition to the function of the second aspect, a second step is provided in the case, the second step facing the inflator storage chamber side of the step portion and expanding the diameter toward the airbag storage chamber side. Since the portions are formed, the partition wall body is fitted and held between these step portions.

In the airbag device according to the fourth aspect, in addition to the action according to the second or third aspect, the airbag mounting portion of the partition wall body is locked by inserting and locking the insertion portion formed in the airbag. Since the claw portion is provided, the airbag is locked and attached to the partition body.

In the method for manufacturing an airbag device according to a fifth aspect, the partition body disposed between the inflator and the airbag is inserted into the case through the case opening with the airbag attached, and , Inserting the pair of step portions in a state of being inclined with respect to the communication portion, and then rotating the partition body to be parallel to the communication portion and contacting each step portion. Is retained and held by.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the airbag device of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 11 denotes an airbag device, which is mounted substantially upward inside an instrument panel (not shown) located in front of a passenger seat of an automobile. .

The airbag device 11 is provided with a retainer 14 as a case, an inflator 15 housed in the retainer 14, a mid retainer 16 as a partition wall, an airbag 17 and the like.

As shown in FIGS. 1 to 3, the retainer 14 has a side plate 21 having a substantially U-shaped cross section, for example.
And a pair of end plates (not shown) covering both end portions of the side plate 21 are spot-welded to form a so-called deep drawing shape in which a case opening 22 is formed on the upper side.

Further, the side plate 21 of the retainer 14 is formed with a pair of front and rear recessed portions 24 recessed inward at an intermediate position in the height direction (depth direction). A communication portion 25 is formed inside the retainer 14 between the 24. The airbag storage chamber 26 is provided above the communication portion 25.
And an inflator storage chamber 27 is formed below the communication portion 25.

On the lower surface side of the recessed portion 24, a stepped portion 31 which is horizontally expanded and is formed on the lower side, that is, on the side of the inflator storage chamber 27 is formed to face each other in the front-rear direction. further,
Located below these step portions 31 and in the vicinity of both ends of the side plate 21 of the retainer 14, there is a second projecting dimension smaller than that of each step portion 31.
The stepped portions 33 are provided so as to project inward, and each stepped portion 31 and the second stepped portion 33 face each other vertically.

Furthermore, a plurality of groove-shaped engagement receiving portions 34 are formed on the front and rear step portions 31 at predetermined intervals along the longitudinal direction.

An inflator insertion hole (not shown) is formed in the lower part of the end plate on one end side of the retainer 14, and the inflator 15 can be inserted into the inflator storage chamber 27 through the inflator insertion hole.

The inflator 15 has a substantially columnar shape and contains an igniter, a propellant, and the like. The inflator 15 is connected to an impact sensor provided in each part of the vehicle body, burns a propellant based on a signal from the impact sensor, and a plurality of gas injection ports formed on the peripheral surface form high-temperature high-pressure nitrogen gas. It is designed to jet.

A fixing bolt 36 is attached to the bottom of the side plate 21 of the retainer 14. The fixing bolt 36 fixes the retainer 14 to the vehicle body of the automobile, and the upper and rear upper ends of the side plate 21 of the retainer 14 are fixed. A plurality of mounting bolts 37 are attached in the vicinity of each part.

A resin cover body 41 is attached to the upper side of the retainer 14 by using these attachment bolts 37, and the case opening 22 is covered. Further, as shown in FIGS. 1 and 2, the cover body 41 has an upper plate portion 42 which is provided substantially flush with the instrument panel, and front and rear portions which are provided so as to project from the lower surface side of the upper plate portion 42. The leg pieces 43 are integrally formed. Then, on the back surface side of the upper plate portion 42, a thin break line (tear line) 44 having a substantially U-shaped plane is formed. Further, the front and rear leg pieces 43 are fitted to the outside of the retainer 14, respectively, and the through holes 45 are formed. Then, the mounting bolts 37 of the retainer 14 are inserted into the through holes 45, respectively, and fixed together with the reinforcing plate 47 by the nut 48.

Further, as shown in FIG. 4, the mid retainer 16
Are integrally formed by punching and bending a metal plate, for example. The mid retainer 16 is formed with a substrate portion 51 having a substantially cylindrical surface shape and bulging upward. The substrate portion 51 is formed with a plurality of substantially elliptical gas passage holes 52 at predetermined intervals. In addition, in the vicinity of both longitudinal end portions of the base plate portion 51, the base portion 51 is bent downward and protrudes.
A positioning projection 53 that abuts on the upper part of the is projected downward.

Further, a frame portion 55 having a substantially flat plate shape is formed around the substrate portion 51. Then, on both side portions along the longitudinal direction of the frame portion 55, an auxiliary plate portion 57 which is inclined downward in a divergent manner, and an airbag attachment portion which is bent upward in a substantially L-shaped cross section. And the engaging piece portions 58 constituting the above are alternately projected. Further, a locking claw 59 is formed by cutting and raising from the auxiliary plate 57 located in the center in parallel with the frame 55.

Further, from both ends in the longitudinal direction of the frame part 55, end locking claws 60 are formed which are bent upward and then bent downward in a substantially U shape, and the frame part 55 is formed. 55
In the vicinity of both ends of the both side portions, fitting piece portions 61 each bent downward in a substantially L-shape are provided to project, and the upper end portions of the fitting piece portions 61 serve as abutting portions 63. The lower end portion of the fitting piece portion 61 serves as the second contact portion 64.

The mid retainer 16 inserts each engaging piece portion 58 into the engaging receiving portion 34 of the retainer 14, and
A state in which the contact portion 63 is in contact with the lower surface of the step portion 31, the second contact portion 64 is in contact with the upper surface of the second step portion 33, and the fitting piece portion 61 is fitted in the recessed portion 24. It is fixed inside the retainer 14.
Furthermore, in this state, the positioning protrusion of the mid retainer 16
The 53 is in contact with the upper surface of the inflator 15 or is opposed to the inflator 15 with a slight gap therebetween, and is prevented from moving downward.

On the other hand, as shown in FIGS. 5 and 6, the airbag 17 is in the form of a bag having a substantially square opening 66 that can be fitted into the mid retainer 16, and is folded in a wave shape, for example. After that, retainer 14
It is located above the inner mid retainer 16 and is housed in the air bag housing 26. The peripheral portion of the opening 66 of the airbag 17 is sewn along the sewing line 67 in a state of being folded back to the outside, and the reinforcing long side portions 68 facing each other that can be fitted to the long side of the mid retainer 16 are provided. And reinforcing short side portions 69 that face each other and can be fitted to the short sides of the mid retainer 16.

Each reinforcing long side portion 68 and each reinforcing short side portion
A predetermined number of locking slits 71 and 72 as insertion portions are formed in the 69 in parallel with the edges. Further, in the airbag 17, the engaging piece portion 58 and the engaging claw portion 59 of the mid retainer 16 are engaged with the engaging slits 71 of the reinforcing long side portions 68 in a state in which the opening 66 is covered on the upper side of the mid retainer 16. The end retainer claws 60 of the mid retainer 16 to each reinforcing short side
It is attached to the mid retainer 16 by being inserted into the locking slit 72 of 69 and locked. Further, in this state, the vicinity of each of the reinforcing long side portions 68 of the airbag 17 is located above the auxiliary plate portion 57 of the mid retainer 16, and the inflator 15 is provided.
It will not come into contact with.

Further, in the airbag 17, an auxiliary cloth 74 is provided near the opening 66 and a circular hole 75 for degassing is formed.

In the air bag device 11 thus constructed, when an automobile crashes, an impact sensor (not shown) detects this impact and activates the igniter of the inflator 15, and the inflator 15 is activated. Inject high-temperature, high-pressure nitrogen gas. This nitrogen gas pushes up the airbag 17 via the gas through hole 52 of the mid retainer 16. Then, the air bag 17 that is caught is rotating and the cover body is rotated.
The cover body 41 is collided with 41, and the cover body 41 is cleaved along a breaking line 44 to form a protruding port of the airbag 17. Then, when nitrogen gas is blown into the inside of the airbag 17, the airbag 17 expands along the windshield and expands in front of the passenger in the passenger seat to protect the passenger from impact. ing.

Next, a method for assembling the airbag device 11 will be described with reference to FIG.

First, as shown in FIG. 7A, the airbag 17 is locked and attached to the mid retainer 16, and the mid retainer 16 is inclined to the empty retainer 14 to which the inflator 15 and the like are not attached. With the case opening 22
Insert from.

Then, as shown in FIG. 7B, the mid retainer 16 is inserted into the inflator accommodating chamber 27 while the mid retainer 16 is being tilted while passing through the communicating portion 25.

Then, as shown in FIGS. 7 (c) and 7 (d), the mid retainer 16 is rotated to move the retainer.
It is parallel to the communicating portion 25 of 14.

Further, as shown in FIG. 7 (e), the mid retainer 16 is pulled up or pushed up to be translated upward. Then, the fitting piece portions 61 formed on both sides of the mid retainer 16 come into contact with the second step portion 33 of the retainer 14, and at least one of the mid retainer 16 and the retainer 14 is elastically deformed and the fitting is performed. The piece 61 rides over the second step 33.

In this state, the mid retainer 16 inserts each engagement piece portion 58 into the engagement receiving portion 34 of the retainer 14, and
A state in which the contact portion 63 is in contact with the lower surface of the step portion 31, the second contact portion 64 is in contact with the upper surface of the second step portion 33, and the fitting piece portion 61 is fitted in the recessed portion 24. Then, it is fixed inside the retainer 14.

Next, the airbag 17 is folded and stored in the airbag storage chamber 26, the cover body 41 is attached to the upper side to cover the case opening 22, and finally the inflator 15 is stored in the inflator storage chamber 27 of the retainer 14. By doing
Assembly work of the airbag device 11 is completed. In this state, the positioning protrusions 53 of the mid retainer 16 are in contact with the upper surface of the inflator 15 or face each other with a slight gap therebetween, and are prevented from moving downward.

According to the airbag apparatus 11 of this embodiment, since the inflator 15, the mid retainer 16 and the airbag 17 are housed in the integrated retainer 14, the number of parts and the number of assembling steps are reduced, and the manufacturing cost is reduced. Can be reduced.

Further, by the mid retainer 16 arranged between the inflator 15 and the air bag 17, the folded and stored air bag 17 is held at an appropriate position apart from the inflator 15, and the contact with the inflator 15 is maintained. It is possible to prevent and protect the airbag 17 from high heat generated from the inflator 15. Therefore, the airbag 17 can be formed of a material having a small thickness, and the airbag device 11 can be made smaller and lighter. Particularly, in the above embodiment, the auxiliary plate portion 57 of the mid retainer 16
Since the terminal portion of the airbag 17 is held in an inclined state, it is possible to reliably prevent contact between the terminal portion of the airbag 17 and the inflator 15.

Since the mid retainer 16 to which the airbag 17 is attached can be fitted and attached to the retainer 14 with one touch without using parts such as bolts and rivets, the number of parts and the number of assembly steps can be reduced. However, the manufacturing cost can be reduced.

Also, the airbag 17 can be locked and attached to the mid retainer 16 without using parts such as bolts and rivets, so that the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced. it can.

The retainer 14 is fixed to the inflator 15, the mid retainer 16, the airbag 17, and the like.
Since the structure has the functions of fixing the pressure container of the inflator 15 and the cover body 41, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced.

In addition, the retainer 14 includes a mid retainer 16
Since the step portion 31 that abuts against the airbag 17 is provided to prevent the movement toward the airbag 17 side, the mid retainer 16 and the mid retainer 16 have a simple structure and resist the pressure of the gas even when the gas is injected from the inflator 15. The airbag 17 can be reliably held and reliability can be improved.

Further, by inserting the engaging piece portions 58 formed on the mid retainer 16 into the engagement receiving portions 34 of the retainer 14, it is possible to prevent rattling of the mid retainer 16 in the longitudinal direction.

Since the vicinity of each reinforcing long side portion 68 of the airbag 17 is held above the auxiliary plate portion 57 of the mid retainer 16, it is possible to prevent the airbag 17 from directly contacting the inflator 15. It is possible to prevent the gas injected from the inflator 15 from escaping and efficiently introduce the gas into the airbag 17.

Also, the positioning retainer 53 is attached to the mid retainer 16.
Since the projections are provided so as to abut against the upper portion of the outer peripheral surface of the inflator 15 or face each other with a slight gap therebetween, the mid retainer 16 can be stably fixed.

In this way, the airbag device 11 according to the present embodiment does not require fastening parts such as rivets, the number of parts is reduced, and the assembly can be done with one touch. In addition to being manufactured, the reliability can be improved while simplifying the structure.

In the above embodiment, the mounting bolt 37 is attached to the retainer 14 and the resin cover body 41 is attached to the upper side of the retainer 14 using the mounting bolt 37.
For example, as shown in FIG. 8, a reinforcing plate 81 is fixed to the retainer 14 by spot welding or the like, and a locking portion 82 formed in the reinforcing plate 81 with a substantially U-shaped cross section is attached to the leg of the cover body 41. The cover body 41 can be fixed to the retainer 14 by locking the through hole 45 of the piece portion 43. With such a configuration, the number of parts can be reduced, the assembling work can be facilitated, the retainer 14 can be reinforced, and the airbag 17 can be
It is possible to prevent the retainer 14 from being deformed when it is deployed.

Further, as shown in FIG. 9 and FIG.
The engaging claw portion 59 of the mid retainer 16 is raised upward, and the hooking portion 59 formed by bending the tip of the engaging claw portion 59 into a substantially U shape.
The locking slit 71 of the airbag 17 can be locked to a. In this embodiment, the board portion 51 of the mid retainer 16 is formed in a flat plate shape, and the positioning protrusions 53 are formed at three locations. Further, a plurality of fitting piece portions 61 are formed at predetermined intervals on both side portions along the longitudinal direction of the mid retainer 16, and from each fitting piece portion 61, an engaging piece portion is formed upward. 58 is cut and raised.

In the above embodiment, the airbag device 11 is used.
Although the example in which the above is provided on the upper surface of the instrument panel has been described, the case opening 22 of the retainer 14 may be installed so as to face the occupant side, and is applied to the airbag device 11 for the rear seats and the like. You can also

[0059]

According to the airbag device of the first aspect, the partition body disposed between the inflator and the airbag can hold the accommodated airbag at an appropriate position apart from the inflator. it can. Then, the partition wall body to which the air bag is attached expands in diameter toward the inflator side and abuts on the stepped portion formed on the case to prevent movement toward the airbag side, thus simplifying the structure for fixing the partition wall body. Therefore, the manufacturing cost can be reduced, and the airbag can be easily and surely held via the partition wall.

According to the airbag device of claim 2,
Since the inflator and the airbag are housed in the integrated case, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced. Then, the accommodated airbag can be held at an appropriate position separated from the inflator by the partition body arranged between the inflator and the airbag. Further, the partition wall body to which the airbag is attached is expanded in the inflator side and held in contact with a pair of stepped portions formed in the case, and is prevented from moving to the airbag side. The fixing structure can be simplified to reduce the manufacturing cost, and the airbag can be easily and surely held via the partition body.

According to the airbag device of the third aspect,
In addition to the effect according to claim 2, since the second step portion is formed in the case so as to face the inflator storage chamber side of the step portion and expand in diameter to the airbag storage chamber side, the partition wall can be formed without using a bolt or the like. The body can be fitted between these steps and easily fixed.

According to the airbag device of claim 4,
In addition to the effect according to claim 2 or 3, since the airbag attachment portion of the partition wall body includes the locking claw portion that inserts and locks the insertion portion formed in the airbag, without using a bolt or the like, The airbag can be easily attached to the partition wall by locking.

According to the manufacturing method of the airbag apparatus of the fifth aspect, since the inflator and the airbag are housed in the integrated case, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced. . And, the partition body arranged between the inflator and the airbag is
With the air bag attached, insert it into the case through the case opening, then insert it between the stepped parts that are inclined with respect to the communication part, and then rotate this partition. Then, by making them parallel to the communicating portion and abutting against each step portion, it is possible to hold and retain the retaining portion. Therefore, it is not necessary to fix the partition wall body and the airbag with bolts or the like, the number of parts and the number of assembly steps can be reduced, and the manufacturing cost can be reduced, and a strong force is exerted on the airbag by injecting gas from the inflator. Even when added, the airbag can be reliably held.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an airbag device of the present invention.

FIG. 2 is a cross-sectional view of the above airbag device.

FIG. 3 is a cross-sectional view of a retainer of the above airbag device.

FIG. 4 is a perspective view of a mid retainer of the above airbag device.

FIG. 5 is a perspective view of a part of an airbag of the above airbag device.

FIG. 6 is a perspective view of the airbag of the above airbag device in a deployed state.

FIG. 7 is an explanatory diagram showing a process of assembling the same airbag device.

FIG. 8 is a cross-sectional view showing another embodiment of the airbag device of the present invention.

FIG. 9 is a perspective view of a mid retainer showing another embodiment of the airbag device of the present invention.

FIG. 10 is a cross-sectional view of a part of the above airbag device.

[Explanation of symbols]

 11 Airbag device 14 Retainer as a case 15 Inflator 16 Mid retainer as a partition wall 17 Airbag 22 Case opening 25 Communication part 26 Airbag storage chamber 27 Inflator storage chamber 31 Step portion 33 Second step portion 58 Airbag installation Engaging piece part constituting part 59 Locking claw part 63 Contact part 64 Second contact part 71 Locking slit as insertion part

Claims (5)

[Claims] 1. An inflator for injecting gas, an airbag for inflating and deploying by the gas injected by the inflator, a case for accommodating the inflator and the airbag, and an arrangement provided between the inflator and the airbag. A step portion with which the partition wall abuts is formed in the case by expanding the diameter toward the inflator side, and the partition body has an air bag mounting portion for mounting the airbag, And an abutting portion that abuts a stepped portion of the case. 2. An inflator for injecting gas, an airbag for inflating and expanding by the gas ejected by the inflator, an inflator storage chamber for communicating the inflator with the outside through a case opening having an opening formed therein, and An integral case in which an airbag storage chamber for storing the airbag is formed, which communicates with the inflator storage chamber via a communication portion, and a partition wall body disposed between the inflator and the airbag. In the case, the pair of stepped portions facing each other through the communication portion are formed to have a diameter increased toward the inflator storage chamber side, and the partition wall body is provided with the airbag. An airbag device, comprising: a mounting portion, and a pair of contact portions that contact the step portion of the case. 3. A case is formed with a second step portion facing the inflator storage chamber side of the step portion and expanding in diameter toward the airbag storage chamber side, and the partition wall body is provided with the second step portion. The airbag apparatus according to claim 2, wherein a second contact portion that contacts the air bag is formed. 4. The airbag according to claim 2, wherein the airbag mounting portion of the partition body is provided with a locking claw portion that inserts and locks an insertion portion formed in the airbag. apparatus. 5. An inflator for injecting gas, an airbag for inflating and deploying by the gas injected by the inflator, an inflator storage chamber for communicating with the outside through a case opening formed to store the inflator, and a communication. An inflator storage chamber that communicates with the inflator storage chamber via a communication section and stores the airbag, and an integral case in which a pair of stepped portions facing each other through the communication section are formed, and the inflator. And a partition body disposed between the airbag and, with the airbag attached to the partition body, the partition body is inserted into the case through the case opening, The partition body is inserted between the step portions forming the pair in a state of being inclined with respect to the communication portion, and then the partition body is rotated to the communication portion. A method of manufacturing an airbag device, which is in parallel and abuts on each of the step portions.