阅读说明：本技术 安全气囊 (Air bag ) 是由 桥本和茂 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均衡性良好地展开安全气囊主体部。安全气囊具有袋状的安全气囊主体部(12),该安全气囊主体部(12)具备：气体导入部(15),导入气体；多个气室(19),通过从气体导入部(15)导入气体而膨胀；以及气体引导部(20),向气室(19)引导从气体导入部(15)导入的气体。气体引导部(20)具备：第1气体引导部(27),向沿安全气囊主体部(12)的展开方向的第1方向(X)引导气体；以及多个第2气体引导部(28),分别位于第1气体引导部(27)的末端部(27b)附近,使气体向与第1方向(X)交叉的第2方向(Y)分支。(The present invention provides a kind of air bag, harmonious in simple structure airbag body portion can be unfolded well.Air bag has bag-shaped airbag body portion (12), which has: gas introduction part (15) imports gas；Multiple gas chambers (19) are expanded and importing gas from gas introduction part (15)；And gas guide portion (20), the gas imported from gas introduction part (15) is guided to gas chamber (19).Gas guide portion (20) has: the 1st gas guide portion (27), guides gas to the 1st direction (X) of the expansion direction along airbag body portion (12)；And multiple 2nd gas guide portions (28), it is located near the terminal part (27b) of the 1st gas guide portion (27), makes gas to the 2nd direction (Y) branch intersected with the 1st direction (X).)

1. a kind of air bag expands the head being unfolded to protect occupant and importing gas from the state of folding, It is characterized in that having:

Bag-shaped airbag body portion, has: gas introduction part, imports gas；Multiple gas chambers, by being imported from the gas Portion imports gas and expands；And gas guide portion, Xiang Suoshu gas chamber guide the gas imported from the gas introduction part,

The gas guide portion has:

1st gas guide portion guides gas to the 1st direction of the expansion direction along the airbag body portion；And

Multiple 2nd gas guide portions, are located near the terminal part of the 1st gas guide portion, make gas to the 1st side To the 2nd direction branch of intersection.

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

2nd gas guide portion is located at the position that the 1st direction side is leaned on relative to the 1st gas guide portion.

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

2nd gas guide portion is formed along the 2nd direction respectively.

4. air bag according to any one of claim 1 to 3, which is characterized in that

2nd gas guide portion is tilted from base end part towards terminal part to the direction contrary with the described 1st respectively.

5. air bag according to any one of claim 1 to 4, which is characterized in that

The gas chamber has the neck neck gas chamber at the both sides of the neck neck of occupant,

The air bag has the interval adjustment section at the interval for adjusting the neck neck gas chamber,

1st gas guide portion it is spaced at intervals on the 2nd direction and configure it is multiple, and along and the neck neck use The direction that gas chamber intersects extends.

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 to fold State accommodate and by near occiput import gas and expand expansion come from occiput cladding comprising both sides of the head and time And the part of fore head.

In order to make to imported into upward internal gas branch in the lateral direction from below, in airbag body portion In, gas flow path or sleeve etc. be formed in gas introduction part most nearby or it is opposed with gas introduction part formed (for example, with reference to Patent document 1.).

Patent document 1: Japanese Unexamined Patent Application Publication 2013-540209 bulletin (the 9-12 pages, Fig. 5 and Fig. 6)

The brunt of the imported gas of gas introduction part most nearby is strong, therefore the flowing of gas upward is stronger, if Merely with gas flow path in the lateral direction, then the influx of gas to the left and right is restricted.Also, to draw in the lateral direction When the sleeve of conductive gas, gas in the lateral direction, which imports, to be carried out rapidly, and on the other hand, gas inflow upwards becomes slow It is slow, therefore, in order to make airbag body portion upwards and the left and right sides is unrolled evenly, need structure set in addition etc. and Manufacturing cost increases.

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 be harmonious in simple structure The air bag in airbag body portion is unfolded well.

Air bag described in technical solution 1 expands expansion and importing gas from the state of folding to protect occupant Head, the air bag has bag-shaped airbag body portion, which has: gas introduction part, Import gas；Multiple gas chambers are expanded and importing gas from the gas introduction part；And gas guide portion, Xiang Suoshu gas chamber The gas imported from the gas introduction part is guided, the gas guide portion has: the 1st gas guide portion, to along the safety 1st direction of the expansion direction in air bag main body portion guides gas；And multiple 2nd gas guide portions, it is located at the 1st gas Near the terminal part of guide portion, make gas to the 2nd direction branch intersected with the 1st direction.

Air bag described in technical solution 2 is the air bag according to technical solution 1, wherein each 2nd gas draws The portion of leading is located relative to the position that the 1st gas guide portion leans on the 1st direction side.

Air bag described in technical solution 3 is the air bag according to technical solution 1 or 2, wherein each 2nd gas Body guide portion is formed along the 2nd direction.

Air bag described in technical solution 4 is the air bag according to any one of technical solution 1 to 3, wherein Each 2nd gas guide portion is tilted from base end part towards terminal part to the direction contrary with the 1st.

Air bag described in technical solution 5 is the air bag according to any one of technical solution 1 to 4, wherein The gas chamber has the neck neck gas chamber at the both sides of the neck neck of occupant, and the air bag has adjustment institute The interval adjustment section at the interval of neck neck gas chamber is stated, the 1st gas guide portion is spaced at intervals on the 2nd direction And configured with multiple, and along the direction extension intersected with the neck neck gas chamber.

Invention effect

Air bag according to technical solution 1, by the 1st side to the expansion direction along airbag body portion Nearby configuring to the terminal part of the 1st gas guide portion of guidance gas makes gas respectively to multiple 2nd gases of the 2nd direction branch Guide portion, so as to guide velocity ratio gas introduction part by the 1st gas guide portion of the 2nd gas guide portion guiding utilization The gas that position reduces, therefore by the 1st gas guide portion and the 2nd gas guide portion, can make gas respectively to the 1st direction and Airbag body portion is unfolded so as to harmonious in simple structure in 2nd direction effectively branch well.

According to air bag described in technical solution 2, other than the air bag effect described in the technical solution 1, due to Each 2nd gas guide portion is located relative to the 1st gas guide portion and leans on the position of the 1st direction side, therefore can pass through each 2nd gas Guide portion makes the gas guided using the 1st gas guide portion to the 1st direction side more reliably to the 2nd direction branch.

Air bag according to technical solution 3, other than the effect of the air bag described in the technical solution 1 or 2, Since each 2nd gas guide portion is formed along the 2nd direction, can be made by each 2nd gas guide portion gas more reliably to 2nd direction branch.

According to air bag described in technical solution 4, in addition to air bag described in any one of technical solution 1 to 3 Except effect, by tilting each 2nd gas guide portion towards terminal part to the direction contrary with the 1st from base end part, from And when being guided gas to the 2nd direction by each 2nd gas guide portion, inhibit the flow velocity components towards the gas of the 1st direction side, Thus it enables that airbag body portion is not easy to pull to the 1st direction by the flow velocity of gas.

According to air bag described in technical solution 5, in addition to air bag described in any one of technical solution 1 to 4 Except effect, pass through interval adjustment section and the interval of the 1st gas guide portion extended along the direction intersected with neck neck gas chamber Adjustment, thus occupant neck neck front-rear position adjustment airbag body portion expansion expansion shape width, Thus, it is possible to freely set the gap of neck neck Yu neck neck gas chamber.

Detailed description of the invention

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

Fig. 2 (a) is the expansion in the state of being shown when the occupant of the air bag of the 1st embodiment does not wear from below The top view of an example of unfolded state, Fig. 2 (b) are to show the occupant of the air bag of the 1st embodiment from below not wear When in the state of expansion unfolded state another top view.

Fig. 3 is the expansion movement that the air bag of the 1st embodiment is sequentially showed schematically by Fig. 3 (a) to Fig. 3 (d) Illustrate side view, Fig. 3 (e) is the cross-sectional view of the corresponding position I-I of Fig. 3 (d) corresponding with the example of Fig. 2 (a), Fig. 3 (f) be with The cross-sectional view of the corresponding position I-I of the corresponding Fig. 3 (d) of the example of Fig. 2 (b).

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 exhibition that the air bag of comparative example of the 1st embodiment is sequentially showed schematically by Fig. 5 (a) to Fig. 5 (e) That opens movement illustrates side view.

Fig. 6 is the longitudinal sectional view under the expansion unfolded state of the air bag of the 1st embodiment.

Fig. 7 is the top view for indicating the state of the base fabric of air bag of the 2nd embodiment of the invention.

Fig. 8 is the top view for indicating the state of the base fabric of air bag of the 3rd embodiment of the invention.

Symbol description

10- air bag, 12- airbag body portion, 15- gas introduction part, 19- gas chamber, 20- gas guide portion, 22- As the 1st gas chamber of neck neck gas chamber, zipper of the 24- as width adjustment portion, the 1st gas guide portion of 27-, the end 27b- Portion, the 2nd gas guide portion of 28-, 28a- base end part, 28b- terminal part, the head A-, N- neck neck, the 1st direction X-, the 2nd side of Y- To.

Specific embodiment

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

In Fig. 3, symbol 10 indicates air bag.Has the air bag device 11 of the air bag 10 for protection conduct The head-protecting air bag apparatus of the head A of the occupant of the bicycle of moving body etc..In present embodiment, the air bag Device 11 is, for example, the two-wheel vehicle used air bag device being worn on around the neck of occupant.In addition, hereinafter, front-rear direction (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 upper and lower It is illustrated on the basis of the state of occupant's safe wearing airbag apparatus 11 respectively to (direction arrow U and the direction arrow D).

Moreover, the air bag device 11 is also referred to as air bag mould group, therefore in addition to having as other than bag-shaped Except the above-mentioned air bag 10 in the airbag body portion 12 in shell portion, it is also equipped with to 12 supply gas of airbag body portion Control mechanism and the battery (secondary cell) of power supply as them of the movement of inflator, control inflator etc..Moreover, about The air bag device 11, for example, by prescriptive procedure fold state air bag 10 (airbag body portion 12) with fill Mechanism of qi, control mechanism and battery etc. are contained in the bag bodies such as fabric i.e. inside of cover 13 together, and wound on the neck of occupant Around wear.

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 shown in FIG. 1 is single or more by the groups merging engagement such as sewing, bonding or welding A base fabric, to become on the whole bag-shaped.It is compiled that is, airbag body portion 12 can use 1 base fabric with so-called integral type It knits (One Piece Woven, OPW) progress cylinder to knit and formed, can also be formed as by the engagement such as sewing 2 or more base fabrics It is bag-shaped.Also, the airbag body portion 12 has: gas introduction part 15, imports gas from inflator；Bulge 16, passes through Gas is imported from the gas introduction part 15 and is expanded；And unexpansive portion 17, it is not imported into gas.Moreover, air bag master Body portion 12 be formed as by using sewing etc. formation joint portion 18 (Fig. 4) engage, thus become in the case where expanding unfolded state from The three-dimensional shape of the helmet-like on head is coated around the neck of occupant.

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 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 For the neck neck gas chamber at the both sides of the neck neck of occupant.Each 1st gas chamber 22 is formed as elongated in left-right direction, And it is prominent from the difference left direction of gas introduction part 15 and right direction.Moreover, as shown in Fig. 2 (a) and Fig. 2 (b), each 1st gas chamber 22 are being multiplied and the position in unexpansive portion 17 links using mutual end side by the zipper (zipper) 24 as width adjustment portion The opposed mode in the forward position of the neck neck of seated user winds and is located at around the neck of occupant, thus in expansion unfolded state The neck neck of lower protection occupant.Zipper 24 can adjust on the front position of occupant in airbag body portion 12 The gap W1 of 1 gas chamber 22.For example, relatively small ground setting gap W1, Fig. 2 (b) are shown another in an example that Fig. 2 (a) is shown In example, relatively largely setting gap W1.Zipper 24 for example connects the non-swollen of cloth and the end side of the 1st gas chamber 22 by connector Swollen portion 17 connects.

Each 2nd gas chamber 23 shown in FIG. 1 is located at the position of upside relative to each 1st gas chamber 22, and left and right is matched side by side each other It sets.In the present embodiment, each 2nd gas chamber 23 is for example configured in a manner of symmetrical.In the present embodiment, the 2nd gas chamber 23 are respectively formed with 3 in left and right sides portion, are formed with 1 in central portion, but the number or shape and are not limited.Also, it closes In the state of base fabric in each 2nd gas chamber 23, such as before being engaged by joint portion 18, with the distance of edge from base end side (downside) extends towards the mode that end side (upside) is gradually increased, and in other words, is unfolded in finger-shaped and extends.Therefore, at this In embodiment, between the 2nd gas chamber 23 by joint portion 18 engage before base fabric in the state of become notch section 25, the 2nd Gas chamber 23 each other interval and formed.It is protected in the case where expanding unfolded state from occupant moreover, each 2nd gas chamber 23 becomes Head A rear portion throughout both sides and front position.Also, the 2nd gas chamber 23 for being located at the rear portion of the head A of occupant is set It is set to thickness to increase along the longitudinal direction.

Gas guide portion 20 guides the gas imported from gas introduction part 15 to gas chamber 19.In the present embodiment, the gas Body guide portion 20 is set with: the 1st gas guide portion 27, positioned at the position close to gas introduction part 15 and to along airbag body 1st direction (top) X of the expansion direction in portion 12 guides gas；And the 2nd gas guide portion 28, from the 1st gas guide portion 27 Further to intersecting with the 1st direction X or orthogonal the 2nd direction (left and right) Y guides gas.Also, the gas guide portion 20 may be used also To be further set with the 3rd gas guide portion 29 for just controlling guidance gas further up from the 1st gas guide portion 27.Gas Guide portion 20 is formed such as by engagement base fabric sewing.

1st gas guide portion 27 is distinguished in airbag body portion 12 in the position of the two sides close to gas introduction part 15 Along the 1st direction X-shaped at.That is, each 1st gas guide portion 27 be configured under the expansion unfolded state in airbag body portion 12 from The neck neck of the rear side of occupant spreads occipital position.Between 1st gas guide portion 27,27 is spaced from each other on the 2nd direction Y Every and be arranged.Base end part (lower end) 27a of each 1st gas guide portion 27 relative to gas introduction part 15 on the 1st direction X every Open predetermined distance and on the 1st direction X in the width of the 1st gas chamber 22, terminal part (upper end) 27b is upper in the 1st direction X In the width of the 2nd adjacent gas chamber 23 of 1 gas chamber 22 of Yu Yu.Therefore, the base end part 27a and gas of each 1st gas guide portion 27 Position between introduction part 15 becomes bifurcations 31 of the gas to each 1st gas chamber, 22 branch.In addition, the 1st gas guide portion 27,27 Extend along the direction intersected with the 1st gas chamber 22, the position comprising base end part 27a of each 1st gas guide portion 27 sets substitute The bending position of the 1st gas chamber 22 in the rear for expanding the occupant under unfolded state of capsule main part 12.Therefore, such as Fig. 2 (a) and shown in Fig. 2 (b), according to the interval of the 1st gas guide portion 27,27, in the present embodiment according to base end part 27a, 27a Interval setting occupant rear position in the 1st gas chamber 22 gap W2.For example, in an example shown in Fig. 2 (a), relatively In another example shown in significantly setting gap W2, Fig. 2 (b), relatively small ground setting gap W2, for example, between gap W1 becomes More than half of gap W2.Wherein, about the length based on zipper 24 or the length for connecting cloth gap W1 and drawn based on the 1st gas The gap W2 for leading the interval of base end part 27a, the 27a in portion 27,27, by being set to mutually negative correlativity i.e. significantly Another party is set smaller when as soon as setting side, and the capacity of i.e. each 1st gas chamber 22 of the length without changing each 1st gas chamber 22 can Adjust gap W1, W2.In example shown in Fig. 2 (a), by relatively small ground setting gap W1, and between relatively largely setting Gap W2, each 1st gas chamber 22 are tilted in a manner of the direction amplification spaced at intervals from front towards rear direction.Also, Fig. 2 (b) in example shown in, by relatively largely setting gap W1, and relatively small ground setting gap W2, each 1st gas chamber 22 with Along the longitudinal direction in it is elongated and with being generally parallel to each other arrange in a manner of be arranged.

Also, each 1st gas guide portion 27 is inclined in a manner of moving closer to each other from base end part 27a towards terminal part 27b Tiltedly formed.Therefore, the 1st gas guide portion 27,27 is configured to splayed when viewed from the front.Moreover, each 1st gas guide portion Become the inflow entrance for making gas flow into the 2nd gas guide portion 28 and the 3rd gas guide portion 29 between 27 terminal part 27b 32.In addition, becoming the gas for making to import from gas introduction part 15 between each 1st gas guide portion 27 and gas introduction part 15 To the 1st spatial portion 33 of 32 branch of bifurcations 31 and inflow entrance.1st spatial portion 33 is formed as through each 1st gas guide portion 27 From base end part 27a gradually terminad portion 27b is close and 15 side of gas introduction part broadens and 32 side of inflow entrance narrows.

2nd gas guide portion 28 is in airbag body portion 12 the terminal part 27b's close to the 1st gas guide portion 27 Position respectively along the 2nd direction Y shape at.That is, each 2nd gas guide portion 28 is under the expansion unfolded state in airbag body portion 12 It is configured at the position on the head throughout the left and right sides of occupant.Each 2nd gas guide portion 28 is relative to each 1st gas guide portion 27 are located at the position of the 1st direction side X.That is, the slave base end part 28a of each 2nd gas guide portion 28 spreads the whole position of terminal part 28b In the position for more leaning on the 1st direction (top) side X than the 1st gas guide portion 27.Also, each 2nd gas guide portion 28 is from the 1st gas The terminal part 27b of guide portion 27 is arranged to the 1st direction X and the 2nd direction side Y interval.In addition, each 2nd gas guide portion 28 are formed as in the present embodiment from the base end part 28a relative to 27 relative close of the 1st gas guide portion to relative to the 1st gas The terminal part 28b of body guide portion 27 relatively far away from is gradually inclined linear to the 1st direction side X.Specifically, each 2nd gas Guide portion 28 tilt upward in the present embodiment direction extend and formed.Therefore, each 2nd gas of present embodiment Body guide portion 28 is formed along the direction with the 1st direction X and each ingredient of the 2nd direction Y.Also, each 2nd gas guide portion 28 Terminal part 28b is located at the position in the unexpansive portion 17 between the 2nd adjacent gas chamber 23.Therefore, each 2nd gas guide portion 28 Base end part 28a and the terminal part 27b of each 1st gas guide portion 27 between become the blow vent that is connected to the two sides of inflow entrance 32 35.Each blow vent 35 is open relative to the 1st gas chamber 22 towards adjacent each 2nd gas chamber 23.

3rd gas guide portion 29 is in airbag body portion 12 integrally to the 1st direction side X of the 1st gas guide portion 27 Interval and be arranged.Also, the 3rd gas guide portion 29 airbag body portion 12 central portion or substantially central portion along 1 direction X-shaped at.That is, the 3rd gas guide portion 29 is configured under the expansion unfolded state in airbag body portion 12 from occupant Position of the occiput near the overhead.Base end part (lower end) 29a of 3rd gas guide portion 29 is relative to the 1st gas The terminal part 27b of body guide portion 27 is arranged to the 1st direction side X interval, and configures the base in the 2nd gas guide portion 28 The approximately mid way between of end 28a.Also, terminal part (upper end) 29b of the 3rd gas guide portion 29 draws relative to the 2nd gas Lead the position that portion 28 is located at the 1st direction side X.Therefore, the base end part 29a of the 3rd gas guide portion 29 and each 2nd gas guide portion 28 Base end part 28a between become the blow vent 36 being connected to relative to inflow entrance 32 and blow vent 35.Each blow vent 36 is relative to the 1st Gas chamber 22 is open towards not adjacent remaining each 2nd gas chamber 23.Also, the base end part 29a of the 3rd gas guide portion 29, each 1st Become between the base end part 28a of the terminal part 27b of gas guide portion 27 and each 2nd gas guide portion 28 for making from inflow entrance 32 2nd spatial portion 37 of the gas of inflow to each 35,36 branch of blow vent.2nd spatial portion 37 is located in the present embodiment to be taken Near the occiput of person.

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.

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, as shown in Fig. 4 (b), such as the state of the base fabric shown in Fig. 4 (a), by adjacent and left-right situs In the state of a part overlapping of 2 gas chambers 23, as shown in Fig. 4 (c), the end side of the 2nd gas chamber 23 is engaged by sewing etc. Form joint portion 18.Therefore, as shown in Fig. 4 (d), a part of the 2nd adjacent gas chamber 23 passes through joint portion 18 in left and right directions And overlap each other and formed in up and down direction, these the 2nd gas chambers 23 become one in the state of close in the lateral direction each other Body.More specifically, the 2nd adjacent gas chamber 23 is configured to from the overhead of occupant throughout head in airbag body portion 12 Portion both sides and be in an inclined direction overlapped, and airbag body portion 12 become three-dimensional shape.That is, the 2nd gas chamber 23 is to pacify The mode that the expansion end side in full air bag main body portion 12 narrows overlaps.

Then, the expansion movement of air bag device is illustrated.

The summary of movement as the air bag device, 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, being ejected by inflator Gas the inside in airbag body portion 12 is flowed into from gas introduction part 15, and be directed respectively by gas guide portion 20 to the 1 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 is unfolded in it It is prominent after a part of cover 13, so that the head A of occupant is coated throughout fore head from occiput.

More specifically, if importing gas to the inside in airbag body portion 12 from inflator via gas introduction part 15 Body, then the 1st spatial portion 33 first is expanded on the rear position of the neck neck of occupant by the gas, passes through the 1st spatial portion 33 inhibition airbag body portions 12 pull to the 1st direction (top) X.Then, from the 1st spatial portion 33 to inflow entrance 32 and each branch 31 branches of mouth, and gas is imported from each bifurcations 31 to each 1st gas chamber 22, so that each 1st gas chamber 22 expands, and each 1st The 2nd spatial portion 37 is introduced in from inflow entrance 32 to the gas that the 1st direction (top) X is guided between gas guide portion 27.At this In 2nd spatial portion 37, it is imported with the gas being branched off into except the gas of the 1st gas chamber 22, and the inflow velocity of gas is because of warp Cross inflow entrance 32 and become weaker than the 1st spatial portion 33, thus by relative to each 1st gas guide portion 27 (inflow entrance 32) Each 2nd gas guide portion 28 and the 3rd gas guide portion 29 of interval on 1 direction X, make gas from the 2nd spatial portion 37 to Each blow vent 35,36 effectively branch, and gas is made to imported into each 2nd gas chamber 23, so that each 2nd gas chamber 23 expands.

As a result, as shown in Fig. 3 (a) to Fig. 3 (d), expansion while airbag body portion 12 is toppled over forwards on one side, So as to the 2nd gas chamber 23 as imported gas passes through end side and the top and two sides of the head A along occupant from base end side Portion and the top and both sides that these heads A is encased from rear.Therefore, as shown in Fig. 3 (e) or Fig. 3 (f), the 1st of bulge 16 the Gas chamber 22 expands expansion around the neck neck N of occupant, and as shown in Fig. 3 (d), the 2nd gas chamber 23 is in kiss with the shape of head A The slightly round three-dimensional shape expansion of (the surrounding head A's from rear) closed.That is, bulge 16 is in will be opposed with the head A of occupant Occupant's opposed portion as inside pocket-like (half cheese) expansion.

As above, according to the present embodiment, by making 1st side of the gas to the expansion direction along airbag body portion 12 The terminal part 27b of the 1st gas guide portion 27 guided to X, which is nearby configured, makes gas respectively to multiple the 2 of the 2nd direction Y-branch Gas guide portion 28 can guide velocity ratio gas to lead by the 1st gas guide portion 27 of 28 guiding utilization of the 2nd gas guide portion Enter the gas that the position in portion 15 reduces, therefore gas point can be made by the 1st gas guide portion 27 and the 2nd gas guide portion 28 Not to the 1st direction X and the 2nd direction Y effectively branch, air bag is unfolded well so as to harmonious in simple structure Main part 12.

For example, the air bag device 11a of the comparative example as shown in Fig. 5 (a) to Fig. 5 (e), the 2nd gas guide portion 38 When the terminal part 39b than the 1st gas guide portion 39 more leans on the position of the direction side opposite with the 1st direction X, pass through the 1st gas Guide portion 39 will not reduce on the position of the 2nd gas guide portion 38 to the flow velocity of the 1st direction X gas guided, air bag Head A of the main part 12a by the 1st gas guide portion 39 relative to occupant is substantially unfolded to come to the 1st direction (top) X The gas of gas introduction part 15 by the 2nd gas guide portion 38 can not effectively branch, so that airbag body portion 12a is to the The expansion of 2 directions (left and right directions) Y is delayed, in contrast, gas can be made to the 1st direction X and the 2nd side in present embodiment To Y effectively branch and it is harmonious airbag body portion 12 is unfolded well, so as to realize the head A's along occupant It is unfolded and improves protective value.

Specifically, each 2nd gas guide portion 28 is located at the position of the 1st direction side X relative to the 1st gas guide portion 27, Therefore the gas for being directed to the 1st direction side X using the 1st gas guide portion 27 can be made more to lean on by each 2nd gas guide portion 28 Ground is to the 2nd direction Y-branch.

In addition, each 2nd gas guide portion 28 is formed along the 2nd direction Y, therefore each 2nd gas guide portion 28 can be passed through Make gas more reliably to the 2nd direction Y-branch.

Also, each 2nd gas guide portion 28 is relative to the 2nd direction Y from base end part 28a towards terminal part 28b to the 1st direction (top) X is rolled tiltedly, therefore the direction of the gas guided by the 1st gas guide portion 27 will not be made because of each 2nd gas guide portion 28 and change dramatically, can smoothly to the 2nd direction Y guide.

In addition, when importing gas from gas introduction part 15 to airbag body portion 12, the expansion of the 1st spatial portion 33 first, Thus the 1st spatial portion 33 expanded plays a role as limiter for example physically, and airbag body portion 12 can not The 1st direction (top) X is easily pulled to by the flow velocity of gas.Moreover, 15 side of gas introduction part of the 1st spatial portion 33 is set as comparing inflow entrance 32 sides are wide, therefore (on the lower with close gas introduction part 15 and by the position of the side base end part 27a of the 1st gas guide portion 27 Position) it is largely expanded more greatly, compared with the case where position far from gas introduction part 15 expands, 12 energy of airbag body portion It is enough less susceptible to pull to the 1st direction (top) X.

Also, by zipper 24 and between the 1st gas guide portion 27,27 that the direction intersected with the 1st gas chamber 22 extends Every adjustment, before and after the neck neck N of occupant position adjustment airbag body portion 12 expansion expansion shape width Degree, so as to freely set the gap of neck neck N and the 1st gas chamber 22.For example, in example shown in Fig. 3 (e), air bag Each 1st gas chamber 22 of main part 12 is from below or rounded expansion expansion is observed in top, therefore can make the front of the 1st gas chamber 22 Neighbouring two side contacts with the neck neck N of occupant respectively.On the other hand, in example shown in Fig. 3 (f), airbag body Each 1st gas chamber 22 in portion 12 is from below or top observation is in the longer ellipse of front-rear direction or oblong expansion expansion, makes the 1st The longitudinal direction of gas chamber 22 i.e. central portion nearby two side contacts with the neck neck N of occupant respectively in the front-back direction, so as to It is enough that gap is formed before and after neck neck N.In the case where the air bag 10 of present embodiment, the substitute of expansion shape is expanded Capsule main part 12 has thickness along front and back in the 2nd gas chamber 23 of the occipital position of occupant, therefore can not significantly obtain The rear portion of the head A of occupant and the gap of the 2nd gas chamber 23 are obtained, is taken as shown in fig. 6, airbag body portion 12 is easy interference The rear portion of the head A of person, airbag body portion 12 rearward move the amount of interference limit OL.Therefore, by the front of neck neck N Gap when being set as larger, the bottleneck throat of compressing occupant is able to suppress airbag body portion 12 rearward moves Point.

Also, by making the adjustment of the gap W1 based on zipper 24 and the base end part 27a's based on the 1st gas guide portion 27 The adjustment of the gap W2 at interval has negative correlativity, and without increasing the capacity of the 1st gas chamber 22, there is no need to reduce safety The occupant's restraint performance or development rate of air bag 10 just can be freely set the gap of neck neck N and the 1st gas chamber 22.

In addition, in the first embodiment described above, the angle or length of the 1st gas guide portion 27 and the 2nd gas guide portion 28 It is upper that there is no limit as long as the 2nd gas guide portion 28 is located at the terminal part 27b of the 1st gas guide portion 27 nearby.Therefore, such as 2nd embodiment shown in Fig. 7, each 2nd gas guide portion 28 can be relative to the 2nd direction Y from base end part 28a towards terminal part 28b is tilted to the direction (lower section) opposite with the 1st direction X.In this case, passing through each 2nd gas guide portion 28 to the 2nd direction Y When guiding gas, inhibit the flow velocity components towards the gas of the 1st direction (top) side X, airbag body portion 12 can be less The 1st direction (top) X is easily pulled to by the flow velocity of gas.

Also, the 3rd embodiment as shown in Figure 8, even if each 2nd gas guide portion 28 is along the 2nd direction Y-direction in right and left It is upwardly formed, also can make gas respectively to the 1st direction X and the 2nd by the 1st gas guide portion 27 and the 2nd gas guide portion 28 Airbag body portion 12 is unfolded so as to harmonious in simple structure in Y effectively branch in direction well.Also, the 3rd Gas guide portion 29 is not limited to 1, can control to be formed it is multiple.

In addition, air bag device can also for example be used as air bag device, the substitute in the respective embodiments described above Bag apparatus is configured at the headrest etc. being located at the rear for the head A for riding in the occupant on car seat.

Industrial availability

The present invention is preferably e.g. as two-wheel vehicle used head-protecting air bag apparatus.