阅读说明：本技术 安全气囊 (Air bag ) 是由 桥本和茂 齐藤智有 于 2019-05-22 设计创作，主要内容包括：本发明提供一种安全气囊,其能够以简单的结构获得适当的保护性能。安全气囊(10)通过利用被导入的气体进行膨胀来保护乘坐者的头部(A)。安全气囊(10)具备袋状的安全气囊主体部(12)。安全气囊主体部(12)中并列配置有分别导入气体的多个气室(19)。安全气囊主体部(12)中,一个气室(19)与其他气室(19)的至少一部分连结成重叠的状态。(The present invention provides a kind of air bag, can obtain protective value appropriate in simple structure.Air bag (10) protects the head (A) of occupant by being expanded using imported gas.Air bag (10) has bag-shaped airbag body portion (12).The multiple gas chambers (19) for being directed respectively into gas are arranged in parallel in airbag body portion (12).In airbag body portion (12), a gas chamber (19) is connected to overlapping state at least part of other gas chambers (19).)

1. a kind of air bag, by being expanded the head to protect occupant, the substitute using imported gas Capsule is characterized in that,

Have bag-shaped airbag body portion,

Be arranged in parallel with the multiple gas chambers for being directed respectively into gas in the airbag body portion, and a gas chamber and its At least part of his gas chamber is connected to the state of overlapping.

2. air bag according to claim 1, which is characterized in that

The end side of one gas chamber in the airbag body portion and other adjacent gas chambers is fixed to each other and connects Knot.

3. air bag according to claim 1 or 2, which is characterized in that

In the airbag body portion, in two other gas chambers for clipping gas chamber state Chong Die with one gas chamber Under, the end side of other gas chambers of one gas chamber and both sides is fixed to each other and links.

4. air bag according to claim 3, which is characterized in that

The airbag body portion has:

Lateral margin joint portion engages other described gas chambers of both sides；And

Reinforcement part protects the lateral margin joint portion, protect it from the airbag body portion expansion from described one A gas chamber is influenced to the load bring of other gas chambers.

5. air bag according to claim 4, which is characterized in that

The lateral margin joint portion and the reinforcement part are the sewing unit formed by sewing line,

The reinforcement part extends along the direction intersected with the lateral margin joint portion.

Technical field

The present invention relates to a kind of air bags on head for protecting occupant.

Background technique

In the past, about having the air bag device for importing gas and expanding the air bag of expansion, a kind of packet is disclosed Cover the head of the occupant of the carts such as bicycle and head is protected or cladding be sitting in multiplying on the seat of automobile The head of seated user and the head-protecting air bag apparatus that head is protected.For example, being used in this air bag device Airbag body portion have multiple long air chambers, these gas chambers configure side by side.Moreover, the airbag body portion is with gas chamber Mutual side links to be formed along the inflated configuration of the fillet on the head of occupant, to become in swelling state from rear Head cladding is comprising both sides of the head and throughout the part of fore head (for example, referenced patent document 1.).

Patent document 1: Japanese Unexamined Patent Application Publication 2013-540209 bulletin (page 6~12, Fig. 2)

However, there are unexpansive portions between adjacent gas chamber, it is therefore desirable in addition be arranged in above-mentioned air bag The structure in unexpansive portion is assisted, or the measure of structure more complicatedization for needing to make base fabric etc., reduces manufacturing cost and become difficult.

Summary of the invention

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide one kind can obtain in simple structure it is suitable When protective value air bag.

Air bag described in technical solution 1 protects occupant's by being expanded using imported gas Head, the air bag have bag-shaped airbag body portion, are arranged in parallel in the airbag body portion and lead respectively Enter multiple gas chambers of gas, and a gas chamber is connected to overlapping state at least part of gas chamber described in other.

Air bag described in technical solution 2 is the air bag according to technical solution 1, wherein the substitute One gas chamber of capsule main part and the end side of other adjacent gas chambers are fixed to each other and link.

Air bag described in technical solution 3 is the air bag according to technical solution 1 or 2, wherein air bag In main part, clip two of a gas chamber other gas chambers it is Chong Die with one gas chamber in the state of, one gas chamber And the end side of other gas chambers of both sides is fixed to each other and links.

Air bag described in technical solution 4 is the air bag according to technical solution 3, wherein the substitute Capsule main part has: lateral margin joint portion, engages other described gas chambers of both sides；Reinforcement part protects the lateral margin joint portion, makes it From the load bring shadow from one gas chamber to other gas chambers of the expansion with the airbag body portion It rings.

Air bag described in technical solution 5 is the air bag according to technical solution 4, wherein the lateral margin connects Conjunction portion and the reinforcement part are the sewing unit formed by sewing line, and the reinforcement part is along the side intersected with the lateral margin joint portion To extension.

Invention effect

Air bag according to technical solution 1, a gas chamber are connected to Chong Die at least part of other gas chambers State, therefore coat and assisted between adjacent gas chamber each other by the overlappings of these gas chambers, so as to simply to tie Structure obtains protective value appropriate.

According to air bag described in technical solution 2, other than the effect of the air bag described in the technical solution 1, by It is fixed to each other and links in the end side of a gas chamber and other gas chambers adjacent to each other in airbag body portion, therefore end Side becomes the state that narrows relative to base end side, and adjacent gas chamber is by mutual expansion, in the position to overlap each other to expansion Direction assign load and press, thus the shape on airbag body portion and the head of occupant is correspondingly bent, so as to Enough improve the protective value on the head of occupant.

Air bag according to technical solution 3, other than the effect of the air bag described in the technical solution 1 or 2, In airbag body portion, clip two of a gas chamber other gas chambers it is Chong Die with a gas chamber in the state of, a gas chamber And the end side of other gas chambers of both sides is fixed to each other and links, therefore integrally can continuously increase the perimeter for generating tension, And no need to increase internal pressure and increase reaction force just and can be improved the protective value on the head of occupant.

According to air bag described in technical solution 4, other than the effect of the air bag described in the technical solution 3, lead to Cross reinforcement part protection lateral margin joint portion, protect it from airbag body portion expansion from a gas chamber to other gas chambers Load bring influence, thus maintain the perimeter in airbag body portion, and it is swollen to be reliably prevented airbag body portion Lateral margin joint portion is damaged when swollen, so as to obtain protection zone appropriate.

According to air bag described in technical solution 5, other than the effect of the air bag described in the technical solution 4, make For the sewing unit for forming lateral margin joint portion and reinforcement part by sewing line, is formed and reinforced along the direction intersected with lateral margin joint portion Portion effectively receives the bearing from a gas chamber to other gas chambers of the expansion with airbag body portion from there through reinforcement part The influence brought, so that it can be reliably prevented that lateral margin joint portion caused by the fracture based on the sewing line because of caused by the load Breakage.

Detailed description of the invention

Fig. 1 is the side view for indicating the air bag of the 1st embodiment of the invention.

Fig. 2 is cross-sectional view of the air bag of the 1st embodiment under the expansion unfolded state of the corresponding position I-I of Fig. 1.

Fig. 3 is the top view for indicating the state of the base fabric of air bag of the 1st embodiment.

Fig. 4 (a) to Fig. 4 (c) is the manufacturing process for indicating the airbag body portion of air bag of the 1st embodiment Explanatory diagram, Fig. 4 (d) are the cross-sectional views of the corresponding position II-II of Fig. 4 (c).

Fig. 5 is the side view for indicating the air bag of the 2nd embodiment of the invention.

Fig. 6 is air bag the cuing open under the expansion unfolded state of the corresponding position III-III of Fig. 5 of the 2nd embodiment View.

Fig. 7 (a) to Fig. 7 (c) is the manufacturing process for indicating the airbag body portion of air bag of the 2nd embodiment Explanatory diagram, Fig. 7 (d) are the cross-sectional views of the corresponding position IV-IV of Fig. 7 (c).

Fig. 8 (a) is the side view under the expansion unfolded state for indicating the air bag of the 3rd embodiment of the invention, Fig. 8 It (b) is the side view for amplifying a part for indicating Fig. 8 (a).

Symbol description

10- air bag, 12- airbag body portion, 19- gas chamber, the lateral margin 25- joint portion, 28- reinforcement part, the head A-.

Specific embodiment

Hereinafter, being illustrated with reference to attached drawing to the 1st embodiment of the invention.

In fig. 1 and fig. 2, symbol 10 indicates air bag.Has the air bag device of the air bag 10 for protection The head-protecting air bag apparatus of the head A of the occupant of bicycle as moving body etc..In present embodiment, the safety Airbag apparatus 11 is, for example, the two-wheel vehicle used air bag device being worn on around the neck of occupant.In addition, hereinafter, front and back To (direction arrow FR and the direction arrow RR), left and right sides direction (direction arrow L shown in FIG. 1 and the direction arrow R) and up and down Direction (direction arrow U and the direction arrow D) is illustrated on the basis of the state of occupant's safe wearing airbag apparatus respectively.

Moreover, the air bag device is also referred to as air bag mould group, therefore bag-like enclosure portion is used as in addition to having Airbag body portion 12 above-mentioned air bag 10 except, be also equipped with the inflation to 12 supply gas of airbag body portion Control mechanism and the battery (secondary cell) of power supply as them of the movement of machine, control inflator etc..Moreover, about the peace Full airbag apparatus, for example, by prescriptive procedure fold state air bag 10 (airbag body portion 12) and inflator, Control mechanism and battery etc. are contained in the inside of fabric equal covers together, and wear around the neck of occupant.

Inflator has main part in the form of annular discs or cylindric etc..Igniter and medicament are accommodated in the inside of main part, Igniter is burnt medicament by the electric signal from control mechanism via the connector transmitting connected, and by expansion gas It is quickly supplied in airbag body portion 12 from the gas ejection ports for being formed in main part.

Control mechanism has the sensor or control device of detection impact, which connects via signal wire and inflator It connects, and detects to make inflator work when regulation impact by sensor.

Moreover, airbag body portion 12 is merged by groups such as sewing, bonding or weldings engages single or multiple base fabrics, from And it is integrally formed as bag-shaped.That is, airbag body portion 12 can use 1 base fabric with so-called One-piece woven (One Piece Woven, OPW) it carries out cylinder and knits and formed, it can also be formed as bag-shaped by 2 or more the base fabrics of engagement such as sewing.And And the airbag body portion 12 has: gas introduction part 15, imports gas from inflator；Bulge 16, by from the gas Introduction part 15 imports gas and expands；And unexpansive portion 17, it is not imported into gas.Moreover, the airbag body portion 12 is formed To be engaged by the joint portion 18 of the formation such as utilization sewing, to become around the neck in the case where expanding unfolded state from occupant Coat the three-dimensional shape of the helmet-like on head.For example, the joint portion 18 of present embodiment is the sewing unit formed by sewing line.

Gas introduction part 15 is formed as opening portion.The gas introduction part 15 is the exhibition as airbag body portion 12 Open the part of base end side.In the present embodiment, which is located at the rear portion around the neck of occupant.The gas It for example can be inserted into a part for having the main part of inflator in introduction part 15.

Bulge 16 has multiple gas chambers (chamber) 19 expanded by the importing of the gas from gas introduction part 15. Also, the gas guide portion 20 (Fig. 3) of the flowing for the gas that control is imported to gas chamber 19 is formed in the bulge 16.

Multiple 1st gas chambers 22 extended in left-right direction are set in gas chamber 19 and with multiple 2nd gas of radiated entend Room 23.

Each 1st gas chamber 22 be gas via inflator from gas introduction part 15 directly imported gas chamber.Each 1st gas chamber 22 Be formed as elongated in left-right direction, and prominent from the difference left direction of gas introduction part 15 and right direction.Moreover, each 1st gas chamber 22 with the mutual end side mode opposed in the forward position of the neck neck of occupant is wound and be located at occupant neck week It encloses, to protect the neck neck of occupant in the case where expanding unfolded state.

Each 2nd gas chamber 23 is located at the position of upside relative to each 1st gas chamber 22, and left and right configuration side by side each other.In this reality It applies in mode, each 2nd gas chamber 23 is for example configured in a manner of symmetrical.In the present embodiment, the 2nd gas chamber 23 is in left and right two Side is respectively formed with 3, is formed with 1 in central portion, carries out these as the 2nd gas chamber 23a~23c and the 2nd gas chamber 23d Illustrate, but the number or shape and is not limited.Also, base fabric of each 2nd gas chamber 23 for example before being engaged by joint portion 18 State (Fig. 3) under open and extend in finger-shaped, so as to edge distance from base end side (downside) towards end side (upside) It becomes larger.Also, in the present embodiment, the 2nd gas chamber 23 by joint portion 18 in the state of being engaged, the 2nd gas chamber 23 are connected to overlapping state at least part of other the 2nd gas chambers 23.More specifically, the 2nd gas chamber of present embodiment 23 the 2nd gas chamber 23 adjacent to each other is fixed to each other and is linked by joint portion 18 with the end side of other the 2nd gas chambers 23. In the case where present embodiment, as shown in Fig. 2, relative to the 2nd gas chamber 23a for being located at left and right, a side edge part (upper limb of 23b Portion), another side edge part (lower edge) of the 2nd gas chamber 23b, 23c is overlapped in a manner of being sequentially located at outside (upside), and the 2nd Another side edge part (lower edge) of the 2nd gas chamber 23c is overlapped on the two sides of gas chamber 23d respectively.Therefore, each 2nd gas chamber 23 becomes It is protected in the case where expanding unfolded state from the rear portion of the head A of occupant throughout both sides and the position of front.

Gas guide portion 20 guides the gas imported from gas introduction part 15 to gas chamber 19.Gas guide portion 20 can be any Ground is configured at airbag body portion 12.

Along each gas chamber 19 of bulge 16 in the state of base fabric before being engaged by joint portion 18 of unexpansive portion 17 Outer rim is formed as foliaceous.The unexpansive portion 17 of present embodiment for example as the jointing edge (tape edge) of the gas chamber 19 in base fabric and It is formed.Moreover, unexpansive portion 17 is configured along the end side and side edge part of gas chamber 19.That is, unexpansive portion 17 along each 1st gas chamber 22 and The respective end side and side edge part of each 2nd gas chamber 23 configure.

Joint portion 18 is such as the position for arranging the unexpansive portion 17 of the end side of the 2nd gas chamber 23 by formation sewing. In present embodiment, such as the state of the base fabric shown in Fig. 4 (a), as shown in arrow and Fig. 4 (b), make it is adjacent and to the left and right In the state that a part of 2nd gas chamber 23 (the 2nd gas chamber 23a~23d) of arrangement is successively overlapped, as shown in Fig. 4 (c), pass through seam System etc. engages the end side of multiple 2nd gas chambers 23 and forms joint portion 18.Therefore, as shown in Fig. 4 (d), the 2nd adjacent gas chamber 23 A part by joint portion 18 in left and right directions and up and down direction overlaps each other and to be formed, between the 2nd adjacent gas chamber 23 The position in unexpansive portion 17 is coated by a part of the 2nd adjacent gas chamber 23 respectively.More specifically, the 2nd adjacent gas chamber 23 It is configured in an inclined direction be overlapped from the overhead of occupant throughout both sides of the head portion in airbag body portion 12, and And airbag body portion 12 becomes three-dimensional shape.That is, the 2nd gas chamber 23 is narrowed with the expansion end side in airbag body portion 12 Mode overlap.

Moreover, about air bag device, as summary, when cart collision etc., if detecting to advise by sensor Fixed impact, then control device makes inflator work, and sprays gas from the inflator.Moreover, by inflator injection Gas flows into the inside in airbag body portion 12 from gas introduction part 15, and is directed respectively by gas guide portion 20 to the 1st Gas chamber 22 and the 2nd gas chamber 23, airbag body portion 12 is expanded from the state of folding to be unfolded, thus because pressure tearing cover is unfolded in it A part of body and protrude, thus from occiput up to fore head cladding occupant head A.

At this point, mutual at least part overlapping adjacent to each other of the 2nd gas chamber 23 and configure, therefore pass through these the 2nd The overlapping of gas chamber 23 coats each other and assists the unexpansive portion 17 between the 2nd adjacent gas chamber 23, and protection stroke is inhibited to become smaller Part can get the protective value appropriate that can be effectively protected the head A of occupant in simple structure.

Also, the end side of the 2nd gas chamber 23 adjacent to each other in airbag body portion 12 is mutually solid by joint portion 18 Determine and link, therefore become the state that narrows relative to base end side of end side, the 2nd adjacent gas chamber 23 by mutual expansion, Load is assigned to the direction of expansion on the position to overlap each other and is pressed, thus the head in airbag body portion 12 and occupant The shape (fillet) of portion A is correspondingly bent.Therefore, it can be improved the protective value of the head A of occupant, and be able to suppress gas The capacity of room 19 (the 2nd gas chamber 23), therefore output is able to use as to the inflator of 12 supply gas of airbag body portion Lesser equipment, so as to become miniaturization and lightweight.Also, end side, which only passes through, between the 2nd adjacent gas chamber 23 connects Conjunction portion 18 and be fixed to each other, therefore gap is generated between the base end side of the 2nd gas chamber 23 before inflation sometimes, but expanding In the state of, the 2nd gas chamber 23 is utilized each other to the load that expansion direction applies and is pressed, thus, it is possible to eliminate its gap, therefore Segmentation gas chamber 19 and the end of fixed the 2nd adjacent gas chamber 23 merely with formation joint portions 18 such as simple sewings when cutting base fabric End side can easily inhibit the part for protecting stroke to become smaller, and while so as to inhibit manufacturing cost, improve occupant Protective value.

Then, with reference to Fig. 5 to Fig. 7, the 2nd embodiment is illustrated.In addition, about identical as the first embodiment described above Composition and effect, add the same symbol and the description thereof will be omitted.

In the air bag 10 of present embodiment, the 2nd gas chamber 23 of the gas chamber 19 about airbag body portion 12 is being pressed from both sides Two of the 2nd gas chamber 23 other the 2nd gas chambers 23 it is Chong Die with the 2nd gas chamber 23 in the state of, the 2nd gas chamber 23 and The end side of other the 2nd gas chambers 23 of both sides is fixed to each other and links.

In present embodiment, airbag body portion 12 is substantially formed in base fabric identical with the 1st embodiment, In The 2nd gas chamber 23a, the 23c for clipping the 2nd gas chamber 23b is overlapped in the state of the two sides of the 2nd gas chamber 23b, these the 2nd gas chamber 23a, The side edge part of 23c is each other such as being fixed to each other in the position in unexpansive portion 17, and the 2nd gas chamber by lateral margin joint portion 25 sewing The end side of 23a~23c is fixed to each other by joint portion 18 and is linked to the position in unexpansive portion 17.For example, present embodiment Lateral margin joint portion 25 be the sewing unit formed by sewing line.Lateral margin joint portion 25 is relative to joint portion 18 along the direction of intersection It is formed.

For example, the state of the base fabric shown in Fig. 7 (a) makes to clip 23 (the 2nd gas of the 2nd gas chamber as shown in Fig. 7 (b) Room 23b) other the 2nd gas chambers 23 (the 2nd gas chamber 23a, 23c) a part respectively with the 2nd gas chamber 23 (the 2nd gas chamber 23b) It is overlapped and lateral margin is formed by the side edge part opposite each other that sewing etc. engages other the 2nd gas chambers 23 (the 2nd gas chamber 23a, 23c) Joint portion 25, as shown in Fig. 7 (c), by sewing etc. engagement one the 2nd gas chamber 23 (the 2nd gas chamber 23b) and both sides other the 2nd The end side of gas chamber 23 (the 2nd gas chamber 23a, 23c) and form joint portion 18.Therefore, as shown in Fig. 7 (d), by joint portion 18 and Lateral margin joint portion 25, a part of other multiple the 2nd gas chambers 23 (the 2nd gas chamber 23a, 23c) is relative to therebetween one the 2nd Gas chamber 23 (the 2nd gas chamber 23b) is overlapped and is formed, the unexpansive portion 17 between other the 2nd gas chambers 23 (the 2nd gas chamber 23a, 23c) Position is coated by a part of the 2nd gas chamber 23 (the 2nd gas chamber 23b).More specifically, with 23 (the 2nd gas of the 2nd gas chamber Room 23b) it is closer with the head A of occupant, for example be located inside, and other the 2nd gas chambers 23 (the 2nd gas chamber 23a, 23c) relative to One the 2nd gas chamber 23 (the 2nd gas chamber 23b) is located at the outside opposite with head A, and is overlapped and arranges along both sides of the head portion adipping The mode of column configures, and airbag body portion 12 becomes three-dimensional shape.That is, the 2nd gas chamber 23 is with airbag body portion 12 The mode that expansion end side narrows overlaps.

Moreover, the summary as air bag device, when cart collision etc., as defined in being detected by sensor When impact, control device makes inflator work, and sprays gas from the inflator.Moreover, the gas sprayed by inflator The inside in airbag body portion 12 is flowed into from gas introduction part 15, and is directed respectively by gas guide portion 20 to the 1st gas chamber 22 and the 2nd gas chamber 23, airbag body portion 12 is expanded from the state of folding to be unfolded, thus because pressure tearing cover is unfolded in it A part and protrude, thus from occiput until fore head coat occupant head A.

At this point, about the 2nd gas chamber 23, it is Chong Die with the 2nd gas chamber 23b in the 2nd gas chamber 23a, the 23c for clipping the 2nd gas chamber 23b Under state, the end side of the 2nd gas chamber 23a, 23c of the 2nd gas chamber 23b and both sides are fixed to each other and link, therefore can integrally connect Increase the perimeter L N for generating the outside in airbag body portion 12 of tension continuously, and relative to Chong Die with the 2nd gas chamber 23b 2nd gas chamber 23a, the 23c in outside is generated to the position between the 2nd gas chamber 23a, 23c when expanding from the 2nd gas chamber 23b of inside and is pressed The load of pressure, thus the 2nd gas chamber 23a, 23c is in the position of side edge part (lateral margin joint portion 25) opposite each other along dashing forward outward Direction out is pressed.Therefore, in airbag body portion 12, the tension in outside can be increased, therefore be capable of increasing gas chamber The internal pressure of 19 (bulges 16), or do not increase gas chamber 19 (bulge 16) i.e. no need to increase the output of inflator, can only by Fixed gas chamber 19 is just capable of increasing the reaction force of the chaff interferent relative to the outer side contacts with airbag body portion 12, thus It can get the protective value appropriate that can be effectively protected the head A of occupant in simple structure.

Also, 2nd gas chamber 23a, 23c Chong Die with the 2nd gas chamber 23b about a part, mutual side edge part pass through lateral margin Joint portion 25 and be fixed to each other, thus, it is possible to generate biggish tension, so as to improve protective value, and during fabrication can Enough workability improved when fixing the end side of the 2nd gas chamber 23a~23c.

Then, with reference to Fig. 8, the 3rd embodiment is illustrated.In addition, about composition identical with the respective embodiments described above And simultaneously the description thereof will be omitted for the additional the same symbol of effect.

In above-mentioned 2nd embodiment, the air bag 10 of present embodiment has relative to from air bag master The reinforcement part 28 at the load protection lateral margin joint portion 25 of the 2nd gas chamber 23b to the 2nd gas chamber 23a, 23c of the expansion in body portion 12.

That is, reinforcement part 28 reinforces lateral margin joint portion 25, the lateral margin joint portion 25 engagement folder as shown in Fig. 8 (a) and Fig. 8 (b) The 2nd gas chamber 23b and with as Chong Die more in the outside of side opposite with the head A of occupant relative to the 2nd gas chamber 23b A 2nd gas chamber 23a, 23c.Reinforcement part 28 is the sewing unit formed with lateral margin joint portion 25 likewise by sewing line, and this reality The reinforcement part 28 for applying mode is to extend the sewing line for constituting lateral margin joint portion 25 and the extension sewing unit that is formed.That is, reinforcement part 28 It is formed with lateral margin joint portion 25 by identical sewing line.In the present embodiment, the configuration of reinforcement part 28 is being located at the 2nd gas chamber The unexpansive portion 17 of the side edge part of 23a, 23c.Reinforcement part 28 is for example along the one of the unexpansive portion 17 for being formed with lateral margin joint portion 25 Part extends and is formed.Reinforcement part 28 may be formed at one of the unexpansive portion 17 to overlap each other locating for lateral margin joint portion 25 Point, it can also extend to a part in unfolded unexpansive portion 17.Reinforcement part 28 is connected with lateral margin joint portion 25, and along with The direction that lateral margin joint portion 25 intersects is formed.Reinforcement part 28 is in the unexpansive portion 17 of the 2nd gas chamber 23c for being located at upside from lateral margin The end at joint portion 25 extends towards upside, the rear upside of present embodiment.

Moreover, if from inflator spray gas from gas introduction part 15 flow into airbag body portion 12 inside, and Be directed respectively by gas guide portion 20 to the 1st gas chamber 22 and the 2nd gas chamber 23, about the 2nd gas chamber 23, from relative to the 2nd gas When 2nd gas chamber 23a, the 23c in the outside of room 23b overlapping is that the 2nd gas chamber 23b of inside starts expansion, in the 2nd gas chamber 23a, 23c Between position generate pressing load.Therefore, it results from the load of the expansion in airbag body portion 12 from the 2nd gas chamber The direction that 23b intersects with lateral margin joint portion 25 towards the direction (direction arrow F) for being located remotely from each other the 2nd gas chamber 23a, 23c, In other words, it results from towards the direction for cutting the sewing line for constituting lateral margin joint portion 25.That is, the 2nd of airbag body portion 12 the Gas chamber 23a, 23b generate negative along direction identical with the load of limitation original-shape to be restored relative to lateral margin joint portion 25 It carries.Extended through reinforcement part 28 along the direction intersected with lateral margin joint portion 25 and is formed, it can be by entire reinforcement part 28 effectively Ground receives above-mentioned load, to prevent from loading the rear end for being focusing only on lateral margin joint portion 25.In this way, relative to from safety The load of the 2nd gas chamber 23b to the 2nd gas chamber 23a, 23c of the expansion in air bag main body portion 12 protects lateral margin engagement by reinforcement part 28 Portion 25 while maintaining the perimeter L N in airbag body portion 12, is reliably prevented from peace thus, it is possible to improve resistance to load Breakage occurs for lateral margin joint portion 25 when full air bag main body portion 12 expands.That is, being reliably prevented from the sewing at lateral margin joint portion 25 Line is broken because of load.Therefore, the protection zone appropriate in airbag body portion 12 can be obtained by lateral margin joint portion 25 Domain.

Also, reinforcement part 28 is connected formation by constituting the sewing line at lateral margin joint portion 25 with lateral margin joint portion 25, because When this forms lateral margin joint portion 25, it can be formed and extending its sewing part, so that manufacture is easy and spends cost few, and Resistance to load can easily be improved.

In addition, making the 2nd gas chamber 23a, the 23c's for clipping a 2nd gas chamber 23b in the 2nd and the 3rd above-mentioned embodiment At least part is Chong Die with the 2nd gas chamber 23b, still, such as relative to adjacent multiple 2nd gas chambers 23, can make to clip these At least part of multiple 2nd gas chambers 23 of 2nd gas chamber 23 is overlapped, and can also make the 2nd gas chamber 23 for clipping multiple 2nd gas chambers 23 It is overlapped multiple without only one.That is, under the swelling state in airbag body portion 12, positioned at the 2nd gas chamber 23 of inside and position The 2nd gas chamber 23 in outside can also be respectively 2 or more.

Also, in each embodiment, air bag device can also conduct, such as be configured to be located at and be sitting in the seat of automobile On the headrest at rear of head A of occupant etc. air bag device and carry out using.

Industrial availability

The present invention can preferably act as example two-wheel vehicle used head-protecting air bag apparatus.