JPH068118U - Airbag device - Google Patents

Abstract

(57) [Abstract] [Purpose] Reinforcing cloth 14, 14 without increasing the number of parts.
Make sure to protect the supporting seams 13, 13. [Structure] Reinforcing cloth 14, 14 around the opening 9 of the bag 6
Is sewn with the seams 13, 13. This seam 13,
13 is covered with one surface 25 of the large diameter portion 23 of the inflator 21. Therefore, at the time of a collision accident, the hot pressure gas ejected from the ejection ports 12, 12 formed on the outer peripheral surface of the large diameter portion 23 does not touch the seams 13, 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The airbag device according to the present invention is used, for example, in a state where it is attached to a central portion of a steering wheel in order to protect an occupant such as a driver in a collision accident.

[0002]

[Prior art]

 In the case of a collision accident, a so-called secondary collision occurs in which the driver hits the steering wheel following a so-called primary collision in which the vehicle collides with another vehicle. The use of airbag devices is increasing in order to reduce the impact on the driver's body during this secondary collision and protect the driver.

[0003] The airbag device is to inflate the bag abruptly in the event of a collision and receive the driver's body with this bag. Conventionally, for example, Japanese Examined Patent Publication No. 57-60166 and Japanese Unexamined Patent Publication No. 2-256541. Those disclosed in Japanese Utility Model Publication No. 2-91051, No. 3-37050, No. 3-42760, and No. 3-72057 are known. FIG. 3 shows an airbag device disclosed in Japanese Utility Model Publication No. 3-42760.

Since the steering wheel 1 rotates the steering shaft 2, it is fixedly coupled to the rear end of the steering shaft 2. Then, a unit 3 called an airbag module is supported and fixed to the central portion of the steering wheel 1.

The unit 3 is a housing 4 fixed to the steering wheel 1 and an inflator which is supported and fixed to the central portion of the housing 4 and ejects pressure gas such as nitrogen gas in the event of a collision accident. 5, a bag-shaped bag 6 which is supported by the housing 4 in a folded state and inflated by the pressure gas in the event of a collision, and a cover which is supported by the housing 4 and normally covers the bag 6. -7 and.

A circular opening 9 having an inner diameter into which the gas discharge portion 8 of the inflator 5 can be inserted is formed in the bag 6 therein, and the opening 9 is a gas discharge portion 8 of the inflator 5. In the peripheral portion of the holding member 10, the housing 4 is abutted against the housing 4, and the peripheral portion of the opening 9 is sandwiched between the housing 4 and the ring-shaped holding plate 10, and the holding plate 10 is held by a mounting screw (not shown). Is fixed to the housing 4.

When a collision accident occurs, the inflator 5 ejects pressure gas to inflate the bag 6 vigorously based on a signal from an impact detection sensor (not shown). At this time, the cover 7 is torn at the thin portions 11 and 11, and the bag 6 is allowed to come out of the cover 7. As a result, the bag 6 inflates on the rear side (the upper right side in FIG. 3) of the steering wheel 1 and receives the body of the driver.

By the way, in the case of the airbag device configured and acting as described above, the pressure gas ejected from the ejection ports 12, 12 of the inflator 5 at the time of operation (at the time of collision) is scattered around the opening 9 of the bag 6. It is necessary to prevent spraying. In order to insert a part of the inflator 5, the reinforcement cloths 14, 14 (see FIGS. 4 to 5 to be described later) are provided around the opening 9 formed in the bag 6 by the stitches 13, 13 in the peripheral portion. ) Is sewn on and the bag 6 is prevented from tearing from the opening 9 even when the bag 6 is swollen.

While the threads forming the seams 13 and 13 do not always have sufficient heat resistance as they are, the temperature of the pressure gas ejected from the ejection ports 12 and 12 is high in the event of a collision accident. If no measures are taken, the yarn may break and the reinforcing action of the reinforcing cloths 14 and 14 may be lost.

For this reason, conventionally, by the structure as described in, for example, Japanese Utility Model Laid-Open No. 2-71053, the high-temperature pressure gas ejected from the ejection ports 12 and 12 directly flows to the seams 13 and 13. We are trying to prevent being sprayed.

In the case of the structure described in this publication, as shown in FIG. 4, a protective sheet 15 is additionally provided on the inner surface of the reinforcing cloth 14 provided on the inner surface of the bag 6, and The pressure gas is prevented from spraying on the seams 13, 13.

Further, in place of omitting the protective sheet 15 as described above, by applying liquid silicone to the threads forming the seams 13 and 13 and drying and curing, the heat resistance strength of the threads is improved. Is also being done.

[0013]

[Problems to be solved by the device]

 The present invention provides a highly reliable airbag device at a low cost by reliably protecting the seams 13, 13 on which the reinforcing cloths 14, 14 are sewn, without increasing the number of parts. is there.

In the case of the conventional structure shown in FIG. 4, since a member for protecting the seams 13 and 13 such as the protective sheet 15 is used, the number of parts is increased, which complicates parts management and assembly work. The manufacturing cost of the bag device increases.

Further, in the case of the method of improving the heat resistance strength of the seam by the liquid silicon, it is necessary to apply the liquid silicon evenly to the seams 13 and 13 in order to obtain a reliable effect. The inspection to confirm whether or not it has been applied is troublesome, and in order to obtain a product with sufficient reliability, the manufacturing cost also increases.

The airbag device of the present invention was devised in view of the above circumstances.

[0017]

[Means for Solving the Problems]

 The airbag device of the present invention, like the above-described conventional airbag device, includes a housing, an inflator which is supported by this housing and which ejects pressure gas in the event of a collision, and a folded state. A bag-shaped bag supported by the housing and inflated by the pressure gas in the event of a collision.

Particularly, in the airbag device of the present invention, the bag has a reinforcing cloth sewn around the opening by stitches and has a plurality of first through holes formed around the opening. The inflator has a mounting surface that is large enough to cover the seam, and the bag is opened between the inflator and the housing while the seam is covered by the mounting surface. It is characterized in that the inflator and the housing are connected by a connecting member that sandwiches the portion and inserts the first through hole and the second through hole formed in the housing.

[0019]

[Action]

 In the case of the airbag device of the present invention configured as described above, even if high temperature pressure gas is ejected from the inflator due to the occurrence of a collision accident, this pressure gas is not blown to the seam. . Therefore, the seams are not damaged and the reinforcing function of the opening portion by the reinforcing cloth is not lost.

[0020]

【Example】

 1 and 2 show an embodiment of the present invention. The housing 17 made by pressing a metal plate having sufficient rigidity has a circular hole 18 in the center, and a plurality of (four in the illustrated case) small circular holes 19 around the circular hole 18, 19 respectively. In addition, support plate portions 20 and 20 which are bent at right angles in the same direction are formed on the peripheral portion of the housing 17, and attachment plate portions 28 and 28 of a cover 27, which will be described later, can be attached freely.

On the other hand, the inflator 21 that ejects pressure gas in the event of a collision accident has a small diameter portion 22 that can be inserted inside the circular hole 18 and is concentric with the small diameter portion 22. And a large-diameter portion 23 having a sufficiently larger diameter. Further, on the outer peripheral surface of the large-diameter portion 23, jet outlets 12, 12 for jetting the pressure gas are provided.

The bag-shaped bag 6 has an opening 9 into which the small diameter portion 22 of the inflator 21 can be inserted. Reinforcing cloths 14 and 14 are sewn to the front and back surfaces around the opening 9 by stitches 13 and 13, respectively. Around the opening 9, a plurality of (four in the illustrated case) small circular holes 24 1, 24, which are the first through holes, are formed while avoiding the seams 13, 13. The small circular holes 24, 24 are formed at positions that can be aligned with the small circular holes 19, 19 which are the second through holes formed in the housing 17.

As shown in FIG. 1, the bag 6 is normally supported by the housing 17 in a folded state as shown in FIG. 1, and from the jet ports 12 and 12 of the inflator 21 in the event of a collision accident. It is expanded by the pressure gas that is ejected. The diameter D of the large diameter portion 23 of the inflator 5 is set larger than the straight diameter d of the outermost stitch 13 among the plurality of stitches 13 (D> d). All the seams 13 and 13 are covered by a portion of the one surface 25 of the portion 23 located outside the small diameter portion 22.

A plurality of studs 26, 26, which are coupling members that can be inserted into the small circular holes 19, 24, are planted on the one surface 25, which is the mounting surface portion. Reference numeral 27 denotes a cover, which is provided with mounting plate portions 28 and 28 formed on the four circumferences of the housing 17 so as to come into contact with the supporting plate portions 20 and 20. Small circular holes 29 and 30 are formed at positions where the support plate portions 20 and 20 and the mounting plate portions 28 and 28 are aligned with each other.

When the above-described members are combined to form the airbag device of the present invention, studs 26, 26 fixed to the inflator 21 are formed in the bag 6, and small circular holes 24, 24 are formed. And the small circular holes 19, 19 formed in the housing 27 in order, and the tips of the studs 26, 26 are projected from the housing 17. Then, nuts 31 and 31 are screwed into the tip portions of the studs 26 and 26, and further tightened.

As a result, the peripheral portion of the opening 9 of the bag 6 is strongly sandwiched between the one surface 25 of the large diameter portion 23 of the inflator 21 and the housing 17, and the bag 6 and the inflator 21 are separated from each other by the housing 17. Is supported against. Further, in this state, the seams 13, 13 existing around the opening 9 are completely covered by the large diameter portion 23.

After the bag 6 and the inflator 21 are coupled and supported by the housing 17 as described above, after the bag 6 is folded as shown in FIG. 1, the cover 27 is put on the bag 6 and the inflator 21. Then, the small circular holes 30, 30 formed in the mounting plate portions 28, 28 of the cover 27 and the small circular holes 29, 29 formed in the supporting plate portions 20, 20 of the housing 17 are aligned with each other so that both small circular holes 30, By inserting the rivets 32, 32 into the 29 and further crushing the tips of the rivets 32, 32, the attachment plate portions 28, 28 are connected to the support plate portions 20, 20.

In the case of the airbag device of the present invention configured as described above, in the event of a collision, a high temperature pressure is applied from the jet outlets 12, 12 formed on the outer peripheral surface of the large diameter portion 23 of the inflator 21. Gas spouts. The jet outlets 12, 12 for ejecting the high-temperature pressure gas are present outside the seams 13, 13 for sewing the reinforcing cloths 14, 14 to the opening 9 portion of the bag 6 in the radial direction. Then, the pressure gas ejected from each of the ejection ports 12, 12 flows outward in the diametrical direction so as to be further away from the stitches 13, 13.

Moreover, since the seams 13, 13 are completely covered by the one surface 25 of the large-diameter portion 23, even when the pressure gas is jetted from the jet outlets 12, 12 as described above, No pressurized gas is blown onto the seams 13, 13. Therefore, the seams 13 and 13 are not damaged, and the reinforcing function of the opening 9 portion by the reinforcing cloths 14 and 14 is not lost.

[0030]

[Effect of device]

 The present invention is constructed and operates as described above, but since the seams that are sewn with the reinforcing cloth can be surely protected without increasing the number of parts, a highly reliable air bag device can be manufactured at low cost. Can be provided.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a vertical sectional side view showing an example of a conventional structure.

FIG. 4 is a sectional view showing a second example of the same.

[Explanation of symbols]

 1 Steering Wheel 2 Steering Shaft 3 Unit 4 Housing 5 Inflator 6 Bag 7 Cover 8 Gas Discharge Port 9 Opening 10 Suppression Plate 11 Thin Wall 12 Spout 13 Seam 14 Reinforcing Cloth 15 Protective Sheet 17 Housing 18 Circular Hole 19 Small Circular Hole 20 Support plate part 21 Inflator 22 Small diameter part 23 Large diameter part 24 Small circular hole 25 One side 26 Stud 27 Cover 28 Mounting plate part 29, 30 Small circular hole 31 Nut 32 Rivet

Claims (1)

[Scope of utility model registration request] 1. A housing, an inflator which is supported by the housing and ejects pressure gas when a collision accident occurs, and an inflator which is supported by the housing in a folded state and is used by the pressure gas during a collision accident. In an airbag device having an inflatable bag-shaped bag, the bag has a reinforcing cloth sewn around the opening with seams and a plurality of first through holes formed around the opening. The inflator has a mounting surface that is large enough to cover the seam, and the bag is opened between the inflator and the housing while the seam is covered by the mounting surface. The inflator and the housing are coupled by a coupling member that sandwiches the first portion and that inserts the first through hole and the second through hole formed in the housing. Characteristic airbag device.