JPH0564014U - Airbag device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an inexpensive airbag device that can protect a sewn portion at the peripheral edge portion of an opening of an airbag from a high temperature jet gas and is easy to manufacture. [Structure] A gas ejection hole 11a of an inflator 11 and an opening peripheral portion 12 of an airbag 3 fixed to a housing 5
By being interposed between the gas and the
An upright portion 5a having a height such that it cannot be directly blown onto the housing 2 is provided at the open end of the housing 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an airbag device that protects an occupant from an impact by an airbag that is rapidly inflated by gas from a gas generator that operates when a vehicle crashes.

[0002]

[Prior Art]

 In recent years, as a cushioning system that supports a seat belt device for safely holding a vehicle occupant in a seat, in the event of a collision, the occupant's body, especially the head and chest, is received by a balloon-shaped airbag and then the interior Air bags have been put into practical use by gradually releasing these gases, thereby creating a buffer stroke and reducing the impact force on the human body.

[0003] Such an airbag device includes, for example, a steering pad, a center pad, a folded airbag, a module including an inflator (gas generator), and the like. The inflator is ignited by the electric signal from the air bag, and the air bag is instantly inflated by the gas which is burned rapidly. Therefore, when the airbag device is activated, the upper wall of the center pad is broken by the inflation pressure of the airbag, and the airbag is expanded from the broken opening so that the airbag can largely inflate above the center pad. Further, when the module of the airbag device is arranged on the instrument panel, when the airbag device is activated, the airbag cover is broken or expanded due to the inflation pressure of the airbag and expanded.

Conventionally, an airbag of this type has a woven fabric made of synthetic fiber filaments such as nylon 66, nylon 6, polyester fibers, aramid fibers, and various polyester fibers coated with synthetic rubber, and the obtained coated base cloth is predetermined. The cut pieces are cut into the shape of, and the peripheral portion of the cut pieces is sewn with a sewing machine to form a bag. The airbag is attached to the housing (mounting plate) at the peripheral edge of the opening in a folded state so as to cover the inflator, and is inflated and expanded by the gas generated from the inflator.

In addition, in the inflator, the gas ejection holes are provided in the side circumferential surface of the inflator, and by making the gas ejection direction the lateral direction of the inflator, the air bag is uniformly deployed and the occupant is inflated. I try not to give a strong shock to. For this reason, a large stress is generated when the airbag is inflated and the high temperature gas ejected from the inflator is continuously blown to the peripheral edge of the opening of the airbag attached to the housing. Therefore, in order to increase the strength against the load generated at the mounting part and to strengthen the cloth piece against the heat of gas from the inflator, usually a plurality of reinforcing cloths are sewn on top of each other at the peripheral edge of the opening. There is.

However, when the extremely high temperature gas ejected from the inflator or the particles of the gas generant that is released by being mixed with the gas are directly sprayed onto the opening peripheral edge portion of the airbag as described above, There was a problem that the suture thread of the reinforcing cloth was easily broken and holes were easily damaged. Such damage to the airbag may cause gas leakage, and the airbag may not reliably protect the occupant's body.

Therefore, as in the airbag device disclosed in Japanese Utility Model Laid-Open No. 63-123354, the self-sustaining property that the jetted gas directly hits the inside of the opening peripheral edge of the bag body and changes its flow direction to the occupant direction. As in the case where the reinforcing member is provided or the airbag disclosed in Japanese Utility Model Laid-Open No. 2-71053, a protective sheet that covers the opening peripheral edge portion is provided inside the airbag to provide a reinforcing cloth. It is proposed that the sewn part is protected.

[0008]

[Problems to be solved by the device]

 However, the ones disclosed in Japanese Utility Model Laid-Open No. 63-123354 and Japanese Utility Model Laid-Open No. 2-710553 require a separate member such as a self-supporting reinforcing member and a protective sheet, so that the number of parts is increased and the assembly is performed. Since the number of processes is increased, there is a problem that the manufacturing cost is increased.

That is, an object of the present invention is to solve the above-mentioned problems, and it is possible to protect the sewn portion at the peripheral edge portion of the opening of an airbag from a high temperature jet gas, and at the same time, it is easy and inexpensive to manufacture. A bag device is provided.

[0010]

[Means for Solving the Problems]

 The above object of the present invention is to provide a housing to be mounted on a vehicle body, an inflator installed substantially in the center of the housing, and an opening peripheral portion of the inflator which is folded so as to cover the inflator. In an airbag device which is attached and has an airbag which is inflated by the gas ejected from the inflator, the gas ejected by interposing between the gas ejection hole of the inflator and the opening peripheral edge portion of the airbag is The present invention is achieved by an air bag device characterized in that the housing is provided with a gas blocking portion that prevents the gas from being blown directly onto the opening peripheral edge portion of the air bag.

[0011]

[Action]

 According to this invention, the high-temperature blowout gas blown out from the gas blowout hole of the inflator hits the gas blocking portion provided in the housing and is not directly blown to the peripheral edge portion of the opening of the airbag. The gas blocking unit is formed integrally with the housing.

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The airbag device 1 for a driver seat shown in FIG. 1 includes a housing 5 fixed to an upper portion of a boss portion of a steering wheel (not shown), and an inflator 11 attached to the center of an occupant facing mounting surface 5b of the housing 5. An airbag 3 having an opening peripheral portion 12 fixed to the housing 5 in a state of being folded so as to cover the inflator 11, and a base end portion provided so as to cover the airbag 3 The module cover 2 is connected to the housing 5.

The module cover 2 is formed of a coating layer 14 of synthetic resin or rubber material injection-molded so as to embed a net insert 13 which is a scattering prevention reinforcement inside, and the expansion of the airbag 3 is prevented. It is ruptured and expanded by pressure. The airbag 3 is a bag body 3a formed by stacking and joining two cut pieces formed by cutting into a predetermined shape. An inflator is attached to the back side of the airbag (the vehicle body side when mounted in the vehicle). An opening is formed. The peripheral edge portion 12 of the opening is reinforced by superimposing an annular reinforcing cloth 4 on its inner surface and sewing the integrated cloth 4 for sewing.

The inflator 11 is a gas generating device for inflating the airbag 3 in an emergency such as a vehicle collision, and is a thin cylindrical container having a gas generating agent sealed therein. On its side surface, a plurality of gas ejection holes 11a are formed at appropriate intervals along the circumferential direction, and the gas generated by burning the gas generating agent is ejected mainly to the side. It is like this.

The housing 5 is formed with a circular opening for mounting the inflator 11 in the center of the occupant facing mounting surface 5b, and the flange portion 11b of the inflator 11 inserted into the opening from below is In a state of being folded so as to cover the inflator 11, the opening 7 of the airbag 3 attached to the occupant facing mounting surface 5b is attached together with the annular stopper metal 6 superposed on the peripheral edge portion 12, and the bolt 7 and the nut 8 are used. And is fixed to the periphery of the opening of the occupant facing mounting surface 5b.

A mounting end portion 5c that is bent substantially at a right angle and extends in the opposite direction to the occupant is provided on the outer peripheral edge portion of the occupant facing mounting surface 5b. The base end of the module cover 2 is attached to the mounting end 5c from the side surface, and is fixed by the rivet 9 together with the plate 10 applied from the outside. Further, a standing portion 5a, which is a gas blocking portion that is bent at a substantially right angle and extends toward the occupant, is formed at the peripheral edge of the opening of the occupant facing mounting surface 5b. The upright portion 5a has an inner wall surface having an appropriate distance from the side wall of the inflator 11, and a tip edge thereof has a height sufficient to cover the gas ejection hole 11a. .

When a vehicle collision or the like occurs, a gas generating agent in the inflator 11 is burned by a sensor (not shown) to generate gas. The generated gas is laterally ejected from the gas ejection holes 11a and supplied into the airbag 3, so that the airbag 3 is inflated and the module cover 2 is ruptured and expanded to spread on the steering wheel. To do. At this time, a high stress is generated in the opening peripheral portion 12 of the airbag 3, but since the reinforcing cloth 4 is integrally sewn and reinforced on the opening peripheral portion 12, the stress is dispersed. Further, an upright portion 5a is arranged so as to be interposed between the opening peripheral edge portion 12 and the gas ejection hole 11a, so that a very high temperature gas or a gas generating agent mixed with the gas to be discharged is released. Since the particles are blocked by the upright portions 5a and do not directly hit the opening peripheral edge 12, the opening peripheral edge 12 may be damaged by the sutures of the bag body 3a and the reinforcing cloth 4 being cut or holes being opened. There is no. Therefore, gas leakage due to damage to the airbag 3 can be prevented, and the occupant's body can be reliably protected by the airbag 3.

FIG. 2 is a partial cross-sectional perspective view of a driver airbag device according to another embodiment of the present invention. The same members as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the standing pieces 16a, which are gas blocking portions formed at the opening peripheral end of the occupant facing mounting surface 16b of the housing 16, are bent at substantially right angles so as to face the gas ejection holes 11a of the inflator 11. It is composed of a plurality of rectangular pieces extending toward the occupant and having a height and width sufficient to cover the gas ejection holes 11a.

Therefore, when the airbag device is activated and gas is ejected from the gas ejection hole 11a in an emergency such as a vehicle collision, the ejected gas first hits the upright piece 16a, and then passes through the upright portion 16a. And it is mainly ejected to the side. Therefore, it is possible to prevent the ejection direction of the ejection gas from being changed to the occupant direction by the upright pieces 16a so that the airbag is ununiformly deployed.

FIG. 3 is a sectional view of a passenger airbag device 17 according to another embodiment of the present invention. The airbag device 17 includes a housing 23 fixed in an instrument panel (not shown), an inflator 21 arranged in the housing 23, and an opening peripheral edge portion in a state of being folded so as to cover the inflator 21. Reference numeral 27 denotes an air bag 19 fixed to the housing 23, and a module cover 18 arranged so as to cover the air bag 19 and having a base end portion connected to the housing 23.

The airbag 19 is a bag body 19a formed by sewing three cut pieces formed by cutting into a predetermined shape, and a rectangular inflator on the back side of the airbag (the vehicle body side when mounted in the vehicle). A mounting opening is formed. The peripheral edge portion 27 of the opening is reinforced by superposing the reinforcing cloth 20 on the inner surface of the peripheral edge portion 27 and stitching them together to form an integral body. The inflator 21 is a gas generator that inflates the airbag 19 in an emergency such as a vehicle collision, and has a cylindrical container shape with a gas generating agent sealed therein. A large number of gas ejection holes 21a are formed in the peripheral surface portion thereof, so that the gas generated by burning the gas generating agent is ejected radially outward.

The housing 23 is an upper housing 23a having an airbag mounting surface 23c and a substantially rectangular opening formed in the center, and a lower housing that is a box housing the lower half of the inflator 21. 23b and. The lower housing 23b is an annular fastening member that is superposed on the opening peripheral edge portion 27 of the airbag 19 attached to the airbag mounting surface 23c in a folded state so as to cover the inflator 21 accommodated in the housing 23. Along with 22, a bolt 25 and a nut 26 are fixed to the lower side of the opening peripheral edge of the airbag mounting surface 23c.

The base end of the module cover 18 is fixed to the upper end of the upper housing 23 a by a rivet 9. Further, a standing portion 24, which is a gas blocking portion that is bent at a substantially right angle and extends toward the occupant, is formed at the peripheral edge portion of the opening of the airbag mounting surface 23c. The upright portion 24 has a height sufficient to prevent the gas ejected from the gas ejection hole 11a of the inflator 21 from directly hitting the opening peripheral edge portion 27 of the airbag 19.

When a vehicle collision or the like occurs and the airbag device operates, the gas generated from the inflator 21 is ejected from the gas ejection holes 21a and supplied into the airbag 19, so that the airbag 19 is inflated. Then, the module cover 18 is fractured and expanded, and is expanded on the instrument panel. At this time, a high stress is generated in the opening peripheral portion 27 of the airbag 19, but since the reinforcing cloth 20 is integrally sewn and reinforced on the opening peripheral portion 27, the stress is dispersed. Further, an upright portion 24 is disposed between the opening peripheral edge portion 27 and the gas ejection hole 21a, so that very high temperature gas or particles of the gas generating agent mixed with the gas and discharged are generated. It is blocked by the standing portion 24 and does not directly contact the opening peripheral portion 27. Therefore, similar to the above-described embodiment, the opening peripheral edge portion 27 is not damaged such as the sutures of the bag body 19a and the reinforcing cloth 20 being cut or holes being opened.

FIG. 4 is a sectional view of a passenger airbag device 30 according to another embodiment of the present invention. Like the airbag device 17 of the above-described embodiment, the airbag device 30 includes a housing 37, an inflator 36 disposed in the housing 37, and an opening peripheral portion 35 of which is fixed to the housing 37. The air bag 32 and the inner cover 31 that covers the air bag 32 are provided.

The airbag 32 is a bag body 32a formed by sewing three cut pieces formed by cutting into a predetermined shape, and a rectangular inflator is provided on the back side of the airbag (the vehicle body side when mounted in the vehicle). A mounting opening is formed. The peripheral edge portion 35 of the opening is reinforced by superposing a reinforcing cloth 33 on the inner surface of the peripheral edge portion 35 and sewing them together to integrate them. The inflator 36 is a gas generator that inflates the airbag 32 in an emergency such as a vehicle collision, and has a cylindrical container shape in which a gas generating agent is enclosed. A large number of gas ejection holes 36a are formed in the peripheral surface portion thereof so that the gas generated by burning the gas generating agent is ejected radially outward.

The housing 37 is composed of an upper housing 37a having an air bag mounting surface 38 and a substantially rectangular opening formed in the center thereof, and a lower housing 37b which is a box housing the inflator 36. The lower housing 37b, together with an annular stopper metal fitting 34 which is superposed on the opening peripheral edge portion 35 of the airbag 32 attached to the airbag mounting surface 38 in a folded state so as to cover the inflator 36, is bolted. It is fixed to the lower side of the opening peripheral edge of the airbag mounting surface 38 by means of 39 and a nut 40.

The base end portion of the module cover 31 is fixed to the upper end portion of the upper housing 37 a by a rivet 9. Further, the opening peripheral end of the air bag mounting surface 38 extends inward of the lower housing 37b so as to cover the upper side of the inflator 36 which is substantially entirely housed in the lower housing 37b. It has a sufficient length to prevent the gas ejected from the ejection hole 36a from directly hitting the opening peripheral edge portion 35 of the airbag 32.

Therefore, as in the above-described embodiment, the very high temperature gas at the time of operating the airbag and the particles of the gas generating agent which is released by being mixed with the gas are released from the peripheral edge of the opening of the upper housing 37a extending inward of the housing. It is blocked by the portion and does not directly contact the opening peripheral edge portion 35 of the airbag 32. Therefore, similar to the above-mentioned embodiment, the opening peripheral edge portion 35 is not damaged such as the suture thread of the bag body 32a and the reinforcing cloth 33 being cut or a hole being opened.

FIG. 5 is a sectional view of an airbag device 41 for a passenger seat according to another embodiment of the present invention. The airbag device 41 has a housing 47, which is substantially the same as the airbag device 30 of the above-described embodiment, an inflator 46 disposed in the housing 47, and an opening peripheral edge portion 45 thereof fixed to the housing 47. The air bag 43 and the module cover 42 that covers the air bag 43.

The airbag 43 is a bag body 43a formed by sewing three cut pieces formed by cutting into a predetermined shape, and a rectangular inflator is provided on the back side of the airbag (the vehicle body side when mounted in the vehicle). A mounting opening is formed. The peripheral edge portion 45 of the opening is reinforced by superimposing a reinforcing cloth 44 on the inner surface of the peripheral edge portion 45 and sewing them together to be integrated. The inflator 46 is a gas generating device for inflating the airbag 43 in an emergency such as a vehicle collision, and is in the shape of a cylindrical container in which a gas generating agent is enclosed. A large number of gas ejection holes 46a are formed in the peripheral surface portion so that the gas generated by burning the gas generating agent is ejected radially outward.

The housing 47 is like that of the upper housing 37a and the lower housing 37b in the above-described embodiment, which are integrally formed. The housing 47 has an air bag attachment surface 47a and spreads downward to extend the inflator 36. It has a recess 47b for accommodating. On the air bag mounting surface 47a, the opening peripheral edge portion 45 of the air bag 43 attached in a folded state so as to cover the inflator 46, the bolt 39 and It is fixed by the nut 40.

The base end of the module cover 42 is fixed to the upper end of the housing 47 by a rivet 9. Further, a standing portion 48, which is a gas cut-off portion, is formed on the inner side of the housing of the air bag mounting surface 47a that is continuous with the recess 47b, and a part of the bent portion is formed to have a U-shaped cross section and projected toward the occupant. Has been formed. The upright portion 48 has a height sufficient to prevent the gas ejected from the gas ejection hole 46a of the inflator 46 from directly hitting the opening peripheral edge portion 45 of the air bag 43.

Therefore, as in the above embodiment, the gas generating agent particles that are released when mixed with the gas or gas that is extremely hot when the airbag is operated are blocked by the rising portion 48 and the opening of the airbag 43 is opened. Since the peripheral edge portion 45 does not directly contact the peripheral edge portion 45, the opening peripheral edge portion 45 is not damaged such as the suture thread of the bag body 43a and the reinforcing cloth 44 being cut or a hole being opened. Therefore, gas leakage due to damage to the airbag 43 can be prevented, and the occupant's body can be reliably protected by the airbag 43.

The shapes of the housing, the airbag, the inflator and the like are not limited to the shapes of the above-mentioned embodiment, and it goes without saying that various shapes can be adopted. Further, the shape of the gas blocking portion provided in the housing according to the present invention is not limited to that of the above-described embodiment, and for example, the bending angle may not be a right angle.

[0036]

[Effect of the device]

 That is, according to the present invention, the high-temperature ejected gas ejected from the gas ejection holes of the inflator hits the gas blocking portion provided in the housing and is not directly blown to the peripheral edge portion of the opening of the airbag. Therefore, it is possible to prevent gas leakage by preventing damage such as a suture being cut or a hole being opened at the periphery of the opening of the airbag where high stress is generated when the airbag is operated. Further, since the gas blocking portion is formed integrally with the housing, no separate member is required, and it is possible to suppress an increase in the number of parts and an increase in the assembly process.

Therefore, it is possible to protect the sewn portion at the peripheral edge of the opening of the airbag from the high temperature jet gas, and to provide the airbag apparatus which is easy to manufacture and inexpensive.

[Brief description of drawings]

FIG. 1 is a sectional view of an airbag device for a driver's seat according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view of an airbag device for a driver's seat according to another embodiment of the present invention.

FIG. 3 is a sectional view of an airbag device for a passenger seat according to another embodiment of the present invention.

FIG. 4 is a sectional view of an airbag device for a passenger seat according to another embodiment of the present invention.

FIG. 5 is a sectional view of an airbag device for a passenger seat according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air bag device 2 Module cover 3 Air bag 3a Bag body 4 Reinforcing cloth 5 Housing 5a Standing part 5b Occupant facing mounting surface 5c Mounting end 6 Annular stopper 7 Bolt 8 Nut 9 Rivet 10 Plate 11 Inflator 11a Gas ejection hole 12 Opening peripheral edge 13 Net insert 14 Covering layer 16 Housing 17 Air bag device 18 Module cover 19 Air bag 20 Reinforcing cloth 21 Inflator 21a Gas ejection hole 22 Annular stopper 23 Housing 23a Upper housing 23b Lower housing 23c Air bag mounting surface 24 Standing part 25 Bolt 26 Nut 27 Opening peripheral part

Claims (1)

[Scope of utility model registration request] 1. A housing attached to a vehicle body, an inflator attached to substantially the center of the housing, and an opening peripheral portion thereof fixed to the housing in a folded state so as to cover the inflator, In an airbag device having an airbag that is inflated by the gas ejected from the inflator, the gas ejected from the inflator is interposed between the gas ejection hole and the peripheral edge portion of the opening of the airbag, so that the ejected gas is surrounded by the peripheral edge portion of the airbag. An air bag device, characterized in that the housing is provided with a gas shut-off portion that prevents the gas from being blown directly onto the housing.