JPH079932A - Air bag device - Google Patents

Abstract

PURPOSE:To minimize depth of a cone in an air bag device, in which an inflator and an electronic control device are built in a pad. CONSTITUTION:An inflator 10 fitting bolt 13 is inserted to a fixation hole 45 provided in the flat surface 41 of a housing 44 of an ECU 40, and fastened by a nut 70 for fixation under the condition that a bag 20 is pinched between the inflator 10 and the housing 44 of the ECU 40. Namely, a required minimum length of a connector cable for connecting the inflator 10 and the ECU 40 electrically can be shortened by providing the inflator 10 and the ECU 40 integrally, and furthermore, the soldering between terminals of both parts can be possible. A connector cable wiring space inside of a steering 60 is eliminated, and a cone depth can be minimized.

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 example, an airbag device for deploying a bag to protect an occupant in a vehicle collision.

[0002]

2. Description of the Related Art In recent years, in an airbag device that protects an occupant by deploying a bag at the time of a collision, gas is generated by a gas for the purpose of incorporating an electronic acceleration sensor for detecting a vehicle collision in the steering wheel. In some steering systems, an inflator for deploying the vehicle, an electronic acceleration sensor, and an electronic control unit (hereinafter referred to as an ECU) that determines a vehicle collision based on a signal from the sensor are built in the steering wheel.

As a concrete structure, as shown in FIG. 22, a housing 3 containing an ECU is fixed to a steering wheel 6 with bolts 5, and a bag 2 is provided with an inflator 1.
It is sandwiched between the outer peripheral portion 1a and the retainer 7.
The outer peripheral portion 1a of the inflator 1, the bag 2, and the retainer 7 are fastened together with the stay 8, and the stay 8 is fixed to the steering 6 together with the pad 9.

[0004]

However, in the above-mentioned conventional system, since the inflator 1 and the ECU 3 are electrically connected by the connector cable 4, the steering 6 has a space for wiring the connector cable 4. There is a problem in that the cone depth (the length from the surface of the pad 9 to the steering wheel 6) must be deep, because it must be provided inside.

Therefore, the present invention has been made in view of the above problems, and in an airbag device having an inflator and an electronic control device built in a pad, the cone depth can be made as shallow as possible. It is intended to provide.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention provides an inflator for generating gas to deploy a bag,
An electronic control device that has an electronic acceleration sensor that detects a vehicle collision, and performs a collision determination or the like based on a signal from the sensor,
In an airbag device in which is stored in a lid-shaped pad,
The airbag device is characterized in that the housing containing the electronic control unit and the inflator are directly assembled.

[0007]

With the above construction, in the airbag apparatus according to the present invention, the housing containing the electronic control unit and the inflator are directly assembled, so that the connector cable electrically connecting the electronic control unit and the inflator. Not only can be shortened to the minimum required length, but in some cases it is also possible to directly connect the terminals of both parts by soldering, so there is space for wiring the connector cable in the pad. You do n’t have to
There is an excellent effect that the cone depth can be made as shallow as possible.

[0008]

The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention. 1, a bag 20 for inflating and protecting an occupant
Is an insertion hole 2 for inserting the inflator 10 on the bottom surface.
1 and a plurality of fixing holes 22 provided around the hole 21.
And are provided. The inflator 10 that generates gas and deploys the bag 20 is provided with a plurality of gas ejection holes 11 and a flange portion 12 having a plurality of mounting bolts 13. The flange portion 12 and the flange portion 12 will be described later. The bag 20 is tightened with the nut 20 between the flat surface 41 of the housing 44.

The ECU 40 includes a housing 44 having a flat surface 41 and integrally formed, an electronic acceleration sensor for detecting a collision of a vehicle, and a control circuit for making a collision judgment or the like based on a signal from the sensor. . This control circuit is provided on a circuit board 39 fixed to the housing 44 with screws (not shown). The outer peripheral portion 42 of the flat surface 41 of the housing 44 has a bent shape as shown in FIG. 1, and a nut 43 for fixing to the steering wheel 60 is welded or integrally formed. further,
The sheet metal cover 50 is attached to the housing 44 by screws 90.
The outer peripheral portion 51 of the cover 50 has a bent shape as shown in FIG. 1, and is configured to cover the outer periphery of the fixed portion 31 of the pad 30 at the time of final assembly. It

As shown in FIG. 2, the pad 30 has a lip line 32 for breaking when the bag 20 is inflated, and the fixing portion 31 at the end portion of the pad 30 has a pad 3.
It has a hook-shaped shape that faces toward 0. A of this pad 30
As shown in FIG. 3, the cross section taken along the line -A ′ is a hook-shaped fixing portion 31 a, 31 b, 31 c, 31 on the inner surface of the pad 30.
It has a shape provided with d.

Here, the fixing portions 31a, 31 of the pad 30
Since b, 31c, and 31d are provided only on the flat surface portion of the inner surface of the pad 30 and the fixing portion is not provided at the corner portion of the pad 30, the fixing portion 31 is elastically deformed outward when the pad 30 is assembled. In addition, it is possible to obtain sufficient strength in a fitted state. The pad 30 may have a pentagonal shape shown in FIG. 4 in addition to the quadrangular shape shown in FIG. 3, but in this case as well, similar to the shape shown in FIG. , 31f, 31
Since g, 31h, and 31i are provided, the same effects as those described above are obtained.

The airbag device constructed as described above is assembled as described below. That is, first, the inflator 10 is inserted through the insertion hole 21 on the bottom surface of the bag 20, and the flange portion 1 of the inflator 10 is inserted.
The mounting bolts 13 provided on the 2 are attached to the fixing holes 22 of the bag 20.
Pass through. At this time, the bag 20 is folded into a shape that generally matches the internal shape of the pad 30.

Then, the mounting bolt 13 for the inflator 10 is fitted into the fixing hole 45 provided in the flat surface 41 of the housing 44.
Is inserted, and the bag 20 is clamped between the inflator 10 and the housing 44 of the ECU 40 with the nut 70. Then, the pad 30 is covered so as to cover the folded bag 20. And pad 3
The fixed part 31 of 0 to the shoulder part 4 of the flat surface 41 of the housing 44.
When the pad 30 is further pressed, the fixing portion 31 of the pad 30 slides on the outer peripheral portion 42 of the housing 44 while elastically deforming outward, and as shown in FIG. The fixed portion 31 with the outer peripheral portion 4 of the housing 44
It will fit into 2 and be fixed. At this time, the pad 30 is assembled in a state in which the reaction force of the folded bag 20 is received and the force acts upward in FIG.

Subsequently, in this state, the inflator 10 and the E
Makes electrical connection with the CU 40. A hole (not shown) is provided substantially in the center of the flat surface 41 of the housing 44,
A squib (detonator) (not shown) of the inflator 10
The terminal and the circuit board 39 are electrically connected to the inflator 10 and the ECU 40 by a connector cable or soldering.

Finally, the cover 50 of the ECU 40
And fix it to the housing 44 with screws 90. At this time, since the outer peripheral portion 51 of the cover 50 is bent as shown in FIG. 1, it is fixed so as to cover the outer periphery of the fixing portion 31 of the pad 30. Therefore, the lip line 3 of the pad 30 is in the initial stage of deployment of the bag 20.
Although the internal pressure until the fracture of 2 is applied to the fixing portion 31 of the pad 30, the fixing portion 31 does not come off.

In this state, the air bag module component is completed, and the nut 43 provided on the inner side surface of the outer peripheral portion 42 of the housing 44 is screwed from the outside of the steering wheel 60 with the bolt 80, thereby the air bag. The module parts are fixed to the steering wheel 60. As described above, in the airbag module component of the first embodiment, since the inflator 10 and the ECU 40 are integrally provided, the connector cable for electrically connecting the inflator 10 and the ECU 40 has the minimum required length. Not only can the length be shortened, but in some cases it is also possible to solder between the terminals of both parts, so there is no need to provide a space for connector cable wiring in the steering 60, and the cone depth can be reduced. Can be made as shallow as possible.

Further, the air bag module component of the first embodiment has no caulking step and the number of components is smaller than that of the conventional air bag device described above, and therefore the assembling property is greatly improved. be able to. In addition,
In the first embodiment, as shown in FIG. 23, which is a partially enlarged view of FIG. 1, the end portion of the flange portion 12 of the inflator 10 has a curved surface 12a. The curved surface 12a is a sagging portion formed at the time of punching the casing of the inflator 10, and this not only improves the flatness of the mounting portion which is important for sandwiching the bag 20, but also the bag 20 and the inflator 10. Flange part 1
The stress on the contact portion of the bag 2 is relieved, and the bag 2
It is possible to prevent 0 breakage. Also, the flange portion 1
Since the blunt portion used in the punching process is used for the end shape of No. 2, the processing and the molding can be performed at the same time.

Here, the flange portion 1 of the inflator 10
As the end shape of 2, the shape shown in FIG. 24 may be used in addition to the shape shown in FIG. That is, in the airbag device shown in FIG. 24, the end shape of the flange portion 12 of the inflator 10 is the chamfered portion 12b, and even in such a configuration, the same effect as that shown in FIG. 23 can be obtained.

Next, a second embodiment will be described. Figure 5
FIG. 6 is a sectional view showing a second embodiment of the present invention. Note that FIG.
The same reference numerals as those in FIG. 1 denote the same parts as those in FIG. 1. In the first embodiment, the housing 44 and the flat surface 41 were integrally formed, but in the second embodiment, as shown in FIG. 5, the housing 44a is a molded product and the shoulder portion 100 is formed. By forming the bottom plate 110 included therein from sheet metal, the formability of the housing 44a is improved.

Therefore, as the assembling procedure in the second embodiment, the bag 20 is sandwiched by the inflator 10 and the bottom plate 110 inserted into the bag 20, and these and the flange portion 47 of the housing 44a are inflated. The bolts 13 and nuts 70 for fixing are tightened and fixed at once. Then, after the airbag module component is completed, the outer peripheral portion 12 of the housing 44a is
By screwing the nut 43 provided on the inner side surface of 0 with the bolt 80 from the outside of the steering wheel 60,
The airbag module component is fixed to the steering wheel 60.

By doing so, not only can the cone depth be made as shallow as possible in the first embodiment, but also the assemblability can be further improved as compared with the first embodiment. Next, a third embodiment will be described.
FIG. 6 is a sectional view showing the third embodiment of the present invention. In addition,
In the drawing numbers of FIG. 6, the parts having the same numbers as the drawing numbers of FIG. 1 are equivalent to the drawing numbers of FIG. 1.

In the first embodiment, the fixing portion 31 of the pad 30 has a hook shape bent inward with respect to the pad 30, but in the third embodiment, as shown in FIG. By forming the fixing portion 31a of the pad 30 into an L-shaped cross-section that is bent outward with respect to the pad 30, the formability is improved. Therefore, the assembling procedure in the third embodiment includes the inflator 10 and the housing 44.
The bag 20 is sandwiched by the flat surface 41 of the cover 40, and the inflator 10 and the ECU 40 are electrically connected to each other.
Fix 0 with screws 90.

At this time, the outer peripheral portion 51a of the cover 50 initially has an L-shaped cross-sectional shape that faces the L-shaped sectional shape of the fixed portion 31 of the pad 30, and the outer peripheral portion 5 of the cover 50 is formed.
1 and the outer peripheral portion 42 of the flat surface 41, a gap 52 such that the fixing portion 31a of the pad 30 having an L-shaped cross section is inserted.
Is provided. Then, in this state, the pad 30 is covered from above in FIG. 6, and the fixing portion 31 of the pad 30 covers the cover 50.
The cover 50 is supported in a state of abutting on the cover 50, and finally, the outer peripheral portion 51 of the cover 50 is caulked to form a U-shaped cover 50 that wraps the L-shaped cross section of the fixed portion 31 of the pad 30.
Forming an outer peripheral portion 51 of the.

By doing so, not only can the cone depth be made as shallow as possible as in the first embodiment, but also the assemblability can be further improved as compared with the first embodiment. Next, a fourth embodiment will be described.
FIG. 7 is a sectional view showing a fourth embodiment of the present invention, and FIG. 8 is an enlarged sectional view of a pad fixing portion in the fourth embodiment. It should be noted that, in the drawing numbers of FIGS. 7 and 8, the parts having the same numbers as the drawing numbers of FIG. 1 or FIG. 5 indicate the parts equivalent to the drawing numbers of FIG.

In the fourth embodiment, the fixing portion 31b of the pad 30 has a straight shape and a plurality of holes 33.
Is provided on the fixed portion 31b, and the outer peripheral portion 51b of the cover 50 is
A plurality of claw portions 53 are provided at positions corresponding to the holes 33 provided in the pad 30. And, as the assembling procedure in the fourth embodiment, the inflator 10 and the housing 4 are
The bag 20 is sandwiched by the flat surface 41 of the cover 4 and the cover 5
Fix 0 with screws 90. In this state, the pad 30 is covered in the gap 52 from above in FIG. 7, and the pad 30 is further pressed, so that the hole 33 provided in the fixing portion 31b of the pad 30 is provided in advance in the outer peripheral portion 51 of the cover 50. The claw portion 53 is elastically fitted and the assembly of the pad 30 is completed.

By doing so, the assembly process of the airbag device can be greatly improved. In addition,
The fourth embodiment is not limited to the assembling procedure described above, but the claw portion 53 provided on the outer peripheral portion 51b of the cover 50.
By pressurizing the claw portion 53 provided on the outer peripheral portion 51 of the cover 50 in the hole portion 33 provided in the fixing portion 31 of the pad 30.
You may make it fit.

Further, as shown in FIG. 9, instead of providing the claw portion 53 on the outer peripheral portion 51b of the cover 50, the claw portion 122 is provided on the outer peripheral surface 121 of the bottom plate 110 and the pad 3 is formed.
After pressing 0 to elastically fit the claw portion 122 into the hole portion 33 provided in the fixing portion 31b of the pad 30, the cover 50 may be covered. Next, a fifth embodiment will be described.

FIG. 10 is a partially enlarged sectional view showing a fifth embodiment of the present invention, and FIG. 11 is an explanatory view for explaining an assembling process in the fifth embodiment. It should be noted that, in the drawing numbers of FIGS. 10 and 11, the parts having the same numbers as the drawing numbers of FIG. 1 are equivalent to the drawing numbers of FIG. 1. In the fifth embodiment, the cross-sectional shape of the fixed portion 31c of the pad 30 is the pad 30.
The outer peripheral portion of the cover 50 has a substantially L-shaped cross-section that is bent outward, and the claw portion 53a of the outer peripheral portion 51c of the cover 50 has a hook-shaped shape that is bent inward. 51c is provided at a plurality of locations.

As an assembling procedure in the fifth embodiment, the bag 20 is sandwiched between the inflator 10 and the flat surface 41 of the housing 44, and the cover 50 is fixed with the screw 90. In this state, when the pad 30 is pressed from above in FIG. 11A, the fixing portion 31c of the pad 30 contacts the cover 50, and when further pressed, the cover 50 is pressed as shown in FIG. 11B. The outer peripheral portion 51c is elastically deformed.
Then, when the pressure is further increased, as shown in FIG.
The outer peripheral portion 51c of the cover 50 returns to its original shape, and the outer peripheral portion 5
The fixed portion 31c of the pad 30 is locked by the claw portion 53a of 1c, and the assembling is completed.

By doing so, not only can the cone depth be made as shallow as possible as in the first embodiment, but also the assemblability can be further improved as compared with the first embodiment. Next, a sixth embodiment will be described.
FIG. 12 is a partially enlarged sectional view showing a sixth embodiment of the present invention. Note that, in the drawing numbers of FIG. 12, the same numbers as the drawing numbers of FIG. 1 indicate the parts equivalent to the drawing numbers of FIG. 1.

In the sixth embodiment, as in the fifth embodiment described above, the fixing portion 31c of the pad 30 has a substantially L-shaped cross-section which is bent outward with respect to the pad 30, and a gap is formed. It is divided into a plurality of parts by 38.
Further, the claw portion 5 of the outer peripheral portion 51c of the cover 50, which has high rigidity,
The cross-sectional shape of 3b is a hook shape that is bent inward, and is provided at a plurality of locations on the outer peripheral portion 51c of the cover 50. Further, in this embodiment, the housing 44 is further added.
A relief hole 48 is provided in the outer peripheral portion 42 of the flat surface 41 (see FIG. 1) corresponding to the fixed portion 31c of the pad 30.

As the assembling procedure in the sixth embodiment, the bag 20 is sandwiched between the inflator 10 and the flat surface 41 of the housing 44, and the cover 50 is fixed with the screw 90. In this state, when the pad 30 is pressed from above in FIG. 12B, the outer peripheral portion 51c of the cover 50 is not deformed due to its high rigidity, but the fixed portion 31c of the pad 30 composed of a plurality of portions is When it comes into contact with the claw portion 53a of the cover 50 and further pressurizes, it elastically deforms inside the escape hole 48 provided in the outer peripheral portion 42 of the flat surface 41 of the housing 44 (FIG. 1).

When the pad 30 is further pressed,
The fixing portion 31c of the pad 30 eventually comes off the claw portion 53b of the cover 50 and returns to its original shape, and the fixing portion 31c of the pad 30 is locked by the claw portion 53b of the outer peripheral portion 51c to complete the assembly. . Next, a seventh embodiment will be described. FIG. 13 is a sectional view showing a seventh embodiment of the present invention. Note that, in the drawing numbers of FIG. 13, the parts having the same numbers as the drawing numbers of FIG. 1 or FIG. 6 indicate the parts equivalent to the drawing numbers of FIG. 1 or FIG.

In the seventh embodiment, the cup 1 is provided around the bag 20 folded according to the shape of the inner surface of the pad 30.
40 is provided. Then, as the assembly procedure in the seventh embodiment, the inflator 10 is inserted through the insertion hole 21 on the bottom surface of the bag 20, and the mounting bolt 13 provided on the flange portion 12 of the inflator 10 is passed through the fixing hole 22 of the bag 20. . At this time, the bag 20 is folded into a shape that generally matches the internal shape of the pad 30. Subsequently, the pad 30 is housed in a resin cup 140 formed in conformity with the inner surface shape of the pad 30 and configured as shown in the partially enlarged cross-sectional view of the vicinity of the inflator 10 shown in FIG. Then, the pad 30 is attached. The fixing portion 31d of the pad 30 has an L-shaped cross-section that is bent inward with respect to the pad 30.

By doing so, it is possible to prevent a part of the folded bag 20 from being caught in the pad 30 and the outer peripheral portion 42 of the ECU 40 when the pad 30 is assembled. The upper surface of the cup 140 may be taped as needed. Next, an eighth embodiment will be described.

FIG. 15 is a partially enlarged sectional view showing an eighth embodiment of the present invention. Note that, in the drawing numbers of FIG. 15, the same numbers as the drawing numbers of FIG. 5 indicate the parts equivalent to the drawing numbers of FIG. In the eighth embodiment, similar to the seventh embodiment, the folded bag 20 is provided with a cup corresponding to the cup 140 in the seventh embodiment to improve the assembling property.

As the assembling procedure in the eighth embodiment, after the bag 20 is folded into a shape generally matching the inner shape of the pad 30 through the procedure described in the seventh embodiment, E
Attach the bottom plate 110 of the CU 40. And
A heat-shrinkable film (for example, a vinyl chloride film) 150 is formed on the outer periphery of the bag 20 and the bottom plate 110.
Then, the heat-shrinkable film 150 is shrunk by heating to form the cover 150a.

By doing so, the bag 20 does not lose its shape from the folded state, so that the assembling property is improved and the bag 20 can be surely prevented from being caught when the pad 30 is assembled. it can. next,
A ninth embodiment will be described. FIG. 16 is a sectional view showing the ninth embodiment of the present invention. Note that, in the drawing numbers of FIG. 16, the same parts as the drawing numbers of FIG. 1 indicate the parts equivalent to the drawing numbers of FIG. 1. In the ninth embodiment, the ECU 40
The housing 44 is integrally formed with the inflator 10.

In FIG. 16, the bag 20 for inflating and protecting an occupant is provided with an insertion hole 21 for inserting the inflator 10 on the bottom surface and a plurality of fixing holes 22 provided around the hole 21. ing. The inflator 10 that generates gas and deploys the bag 20 is provided with a plurality of gas ejection holes 11 and a flange portion 12 having a plurality of mounting bolts 13. The flange portion 12 and the flange portion 12 will be described later. Bag 2 between back plate 200
0 is tightened with the nut 70.

The housing 14 of the inflator 10 is divided by a partition plate 18 into a medicine chamber 15 and an ECU chamber 40a. Known gas generating agents, transfer agents, squibs, filters and the like are loaded in the medicine chamber 15 as an airbag inflator. In addition, the ECU room 4
0a is provided with an acceleration sensor that detects a collision of the vehicle, and a control circuit that determines a collision or the like based on a signal from the sensor. The control circuit includes a circuit board 3 fixed to the housing 14 of the inflator 10 with screws (not shown).
9 is provided. Further, the ECU chamber 40 a includes a screw 90 for the cover 50 on the housing 14 of the inflator 10.
It is sealed by being attached with.

A hole (not shown) is provided substantially in the center of the partition plate 15, and a squib (detonator element) terminal (not shown) of the inflator 10 and the circuit board 39 are connected to the inflator 10 and the EC by a connector cable or soldering.
The U chamber 40a is electrically connected. Back plate 2
00 in the housing 14
A hole 240 for insertion is provided, and around the hole 240, an EC is attached by a mounting bolt 13 and a nut 70.
A plurality of holes 230 for fixing the housing 14 built into the U40a chamber are provided. Also, the back plate 2
Nuts 43 for fixing the steering wheel 60 to the steering wheel 60 are provided by welding or integrally molding, and a plurality of holes 220 for fixing the pack plate 200, the pad 30, and the retainer 500 with the rivets 250. Is provided. The fixing portion 31e of the pad 30 in this embodiment has a flat shape.

The airbag device constructed as described above is assembled in the following manner. That is, first, the inflator 10 is inserted through the insertion hole 21 on the bottom surface of the bag 20, and the flange portion 1 of the inflator 10 is inserted.
The mounting bolts 13 provided on the 2 are attached to the fixing holes 22 of the bag 20.
And through the hole 230 of the back plate 200. At this time, the bag 20 is folded into a shape that generally matches the internal shape of the pad 30. The bag 20 is provided between the housing 14 of the inflator 10 and the back plate 200.
Is clamped and fixed with a nut 70.

Subsequently, the pad 30 is covered, and the outer peripheral portion 210 of the pack plate 200, the pad 30, and the retainer 500 are fixed by the rivets 250 to complete the airbag module component, and further, the mounting bolts 13 and the nuts 220 are used. The module parts are fixed to the steering wheel 60. By doing so, the airbag module component can be made extremely small, and the number of components and the assembly process can be greatly reduced.

Next, a tenth embodiment will be described. FIG. 17 is a sectional view showing a tenth embodiment of the present invention. Note that, in the drawing numbers of FIG. 17, the same numbers as the drawing numbers of FIG. 1 or 16 indicate the parts equivalent to the drawing numbers of FIG. 1 or 16. In the tenth embodiment, the housing 14 of the inflator 10 and the back plate for fixing the pad 30 to the steering wheel 60 are integrally molded,
The bag 20 includes a retainer ring 300 having a plurality of fixing bolts 310 and a housing 1 of the inflator 10.
4 and the fixing bolt 310 provided on the retainer ring 300 through the hole 17 provided on the flange portion 16 and the fixing hole 22 provided on the bag 20. It is tightened and fixed with.

By doing so, not only can the cone depth be made as shallow as possible as in the first embodiment, but also the assemblability can be further improved as compared with the first embodiment. Next, an eleventh embodiment will be described. FIG. 18 is a sectional view showing the eleventh embodiment of the present invention. Note that, in the drawing numbers of FIG. 18, the same numbers as the drawing numbers of FIG. 1 or FIG. 16 indicate the parts equivalent to the drawing numbers of FIG. 1 or FIG. 16.

In the eleventh embodiment, the inflator 10 is
By adopting a configuration in which the assembling step is performed last, the safety at the time of assembling is improved. That is, as the assembling procedure in the 11th embodiment, first, the bag 20 is sandwiched between the back plate 200 and the retape ring 300, and is locked by a rivet or the like (not shown). Then, in this state, the bag 20 is folded, the pad 30 is covered, and the fixing portion 31 d is assembled so as to be fitted into the back plate 200.

Then, in this state, the inflator 10 is inserted into the hole 240 of the back plate 200, and the plurality of fixing holes 17 provided in the flange portion 12 of the inflator 10 are passed through the fixing bolts 310 of the retainer ring 300, Tighten with the nut 70. Thereby, the inflator 1
At the same time that 0 is attached, the bag 20 is securely tightened and fixed.

By doing so, since the inflator 10 is assembled in the final step, the safety of the assembly structure of the air bag module parts is improved. In addition, in each of the above-described embodiments, as a method of folding the bag 20,
The following is recommended. FIG. 19 is a schematic configuration diagram showing a state in which an airbag device is attached to a three-spoke steering wheel, and FIG. 20 is an explanatory diagram for explaining a positional relationship between the inner shape of the pad and the inflator.

That is, the three-spoke type steering wheel 60b has a shape as shown in FIG. 19, and the connecting portions 60a of the spokes have a smooth curved shape. Therefore, the shape of the pad 30 of the airbag device also needs to be inclined like the pad ends 30c and 30d shown in FIG. Generally, the bag 20 is folded in a rectangular shape and attached to the center of the inflator 10. Therefore, considering the storability of the bag 20, if the center of the inflator 10 is arranged such that the upper area 30a and the lower area 30b of the pad 30 are substantially the same, the bag 20 can be stored compactly.

Therefore, as shown in FIG. 21, the sides 20a and 20b of the bag 20 folded into a square shape are provided with the pad 30.
The bag 20 can be compactly stored by arranging and assembling it so as to be substantially parallel to the inclined portions 30c and 30d. The respective embodiments have been described above,
It is needless to say that the present invention is not limited to the above embodiments and can be implemented in various modes without departing from the scope of the embodiments.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a structure of a pad 30 in the first embodiment.

FIG. 3 is an AA ′ of the pad 30 in the first embodiment.
FIG.

FIG. 4 is a cross-sectional view showing another form of the pad 30.

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a fixed portion of a pad according to the fourth embodiment.

FIG. 9 is an enlarged cross-sectional view of a fixed portion of a pad that is a modified example of the fourth embodiment.

FIG. 10 is a partially enlarged cross-sectional view showing a fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram for explaining an assembling step in the fifth embodiment.

FIG. 12 is a partially enlarged sectional view showing a sixth embodiment of the present invention.

FIG. 13 is a sectional view showing a seventh embodiment of the present invention.

FIG. 14 is a partially enlarged cross-sectional view around an inflator in the seventh embodiment.

FIG. 15 is a partially enlarged sectional view showing an eighth embodiment of the present invention.

FIG. 16 is a sectional view showing a ninth embodiment of the present invention.

FIG. 17 is a sectional view showing a tenth embodiment of the present invention.

FIG. 18 is a sectional view showing an eleventh embodiment of the present invention.

FIG. 19 is a schematic configuration diagram showing a state in which an airbag device is attached to a three-spoke type steering wheel.

FIG. 20 is an explanatory diagram for explaining the positional relationship between the internal shape of the pad and the inflator in the three-spoke steering wheel.

FIG. 21 is an explanatory diagram for explaining a method of disposing a bag in the three-spoke steering wheel.

FIG. 22 is a cross-sectional view showing the configuration of a conventional airbag device.

FIG. 23 is a partially enlarged view of the sandwiching portion of the bag in the device of the present invention according to the first embodiment shown in FIG.

FIG. 24 is a partially enlarged view showing another example of the holding portion of the bag.

[Explanation of symbols]

 10 Inflator 20 Bag 30 Pad 40 ECU 44 Housing

Front Page Continuation (72) Inventor Naoki Nakane 1-1, Showa-cho, Kariya, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor, Ista Sakakibara 1-1-chome, Showa-cho, Kariya, Aichi Prefecture, Nihondenso Co., Ltd.

Claims (1)

[Claims] 1. An electronic control device having an inflator for generating gas for deploying a bag, an electronic acceleration sensor for detecting a vehicle collision, and a collision determination or the like based on a signal from the sensor.
An air bag device in which a housing containing the electronic control device and the inflator are directly assembled to each other in an air bag device in which the above is housed in a lid-shaped pad.