CN102029969A - Resin airbag - Google Patents

Abstract

The invention provides a resin airbag and the circumferential wall of the airbag is made of sheet-shaped synthetic resin.When inflation gas flows into the airbag, the upper wall portion and the lower wall portion of the airbag expand in a separation mode.The three sides surrounded the expansion area are surrounded with outer peripheries.The upper and lower wall portions are connected with each other in a semi-circular arc shape by the section of the airbag along the thickness direction.A continuous curve shape expanding outwardly is formed when viewed downwardly.In the expansion area, folding portions are concentrically configured toward the inner side thereof, which are in a curve shape surrounding the outer peripheries in three sides and expanding toward the outer peripheries.Each folding portion is in a V shape with two inclined parts along the section of the airbag in the thickness direction.The two inclined parts extend from the bottom of a recess.When inflation gas flows into the airbag, the width of the opening is enlarged due to the plastic deformation of the folding portions, so that the air bag expands.The wall thickness is set within a predetermined range, so that the turning of the wall toward the outer surface thereof is avoided.

Description

The resin air bag

Technical field

The present invention relates to a kind of air bag, the airbag apparatus that it is used to carry on vehicle makes expansion flow into gas and expands.In detail, the present invention relates to a kind of resin air bag, it is not to be formed by fibrous materials such as cloth or nonwoven fabrics, but constitutes perisporium by laminar synthetic resin, and this laminar synthetic resin forms by blow molding and injection mo(u)lding etc.

Background technology

Current, as the resin air bag, known a kind of resin air bag (for example, with reference to Japanese Unexamined Patent Application Publication 2002-522286 communique) that is used for airbag device for protecting knee.This resin balloon-shaped rectangularity is tabular, is configured to make short brink relative on left and right directions each other, is configured in chaufeur knee the place ahead.In addition, in this resin air bag, be in the wall portion of driver side in the expansion side, be arranged side by side a plurality of folding parts with section U word shape depression, the wall portion of driver side forms accordion.In this resin air bag, expanding when flowing into gas, while the wall portion of accordion extend to the driver side expansion, then, the state of finishing as expansion and bear the knee of chaufeur.

In addition, as existing other resin air bag, has the resin air bag (for example, with reference to Japanese Unexamined Patent Application Publication 2007-522008 communique) in a kind of seat portion that is housed in seat.For this resin air bag, when the frontal collision of vehicle, expand, the anterior rear side of the passenger's huckle on the seat of fixedly taking one's seat, thus the restriction passenger forwards moves (so-called (submarine) phenomenon that glides).It is tabular that this resin air bag also forms oblong, is provided with a plurality of folding parts with section V word shape depression, the zone that the long side of one side is expanded significantly with formation.And this air bag also expands to thickness direction when expansion flows into gas.

But, all be that to form oblong tabular as existing resin air bag, expand in the mode that increases along its thickness direction, and, the folding part also is configured to, and overlooking under the observation of observing from the thickness direction of air bag, forms the word of the falling U shape along the tabular outer peripheral edges of oblong.

Therefore, in existing resin air bag, so that the mode that the thickness when finishing of expanding increases and the expansion carried out when finishing, in each tabular bight of oblong, especially, near two bights at the two ends, long limit of a side that expands in the mode that increases thickness, along the crossing outer peripheral edges position each other of orthogonal directions, rigidity uprises at it.And, because the thickness of the inside line between above-mentioned bight increases, so near the central authorities between two bights in the outer peripheral edges of the tabular air bag of oblong (near the central authorities on long limit), bend easily and enter the inboard.Therefore, if should bend near the central authorities, then on this bending part, produce stress concentration.Thereby the resin air bag causes following situation easily, that is, leak gas in this bending part upper shed.

In addition, under the situation that produces fold, the degree of depth and the position of this fold are easy to generate skew, its result, and the gauge after the resin airbag inflation is finished may all be offset in each air bag, and is not preferred.

Summary of the invention

The present invention proposes in order to solve above-mentioned problem, and its purpose is to provide a kind of resin air bag, produces fold when it can repression of swelling be finished.

Resin air bag involved in the present invention constitutes perisporium by laminar synthetic resin, and by expanding with the inflow of gas so that each other on thickness direction relative side wall portion and opposite side wall part from mode expand,

This resin air bag is characterised in that,

With so that the outer peripheral edges in the zone that a described side wall portion and described another side wall portion mode separated from one another expand, surround outer peripheral edges and constitute as three sides, it has: two relative edge, they on Width toward each other; And the binding edge, it links two described relative edge,

Described three sides are surrounded outer peripheral edges as the section along thickness direction, a described side wall portion are connected with the semicircle arcuation with described another side wall portion, and, overlook the consecutive curve-like that formation is expanded laterally under the observation,

Surround in the outer peripheral edges institute area surrounded by described three sides, on at least one of a described side wall portion and described another side wall portion, dispose a plurality of folding parts to the inside with one heart, it forms along described three sides and surrounds outer peripheral edges and surround the curve-like that the outer peripheral edges side expands to described three sides, thickness direction depression to described air bag, and

Described each folding part is separately along the section shape of described balloon thickness direction, form the bottom with depression and the V word shape of two rakes, these two rakes extend to both sides from this bottom, described each folding part constitutes, when expansion flows into gas, carry out plastic deformation on one side so that the A/F size enlarges, Yi Bian make described airbag inflation

The gauge that the position of described folding part is set is set at, and expansion is flowed into gas, guarantees the specific thickness size and finishes when expanding, and suppresses in the scope of the outside face side upset in described folding part.

In resin air bag involved in the present invention,,, gauge is increased and expand then so that a side wall portion and another side wall portion mode separated from one another if expansion is flowed into gas.At this moment, between the side wall portion and another side wall portion in the three sides encirclement outer peripheral edges, crossing angle is each other enlarged, on one side two rakes crossing angle each other across the bottom in each folding part is enlarged, top side and the crossing angle on every side of rake is enlarged, thereby gauge is increased.In other words, carry out plastic deformation so that the A/F size enlarges, thereby gauge is increased by each folding part.

And in resin air bag involved in the present invention, when expanding, three sides are surrounded outer peripheral edges and are formed the consecutive curve-like that expands laterally, do not have straight line portion.In addition, the resin air bag is connected with another side wall portion a side wall portion with the semicircle arcuation.Therefore, on three sides are surrounded outer peripheral edges, be difficult to produce local the depression to the inside and the fold that generates.In addition, a plurality of folding parts of expansion area are configuration with one heart to the inside also, forms along three sides and surrounds outer peripheral edges and surround the curve-like that the outer peripheral edges side expands to three sides.Therefore, air bag is surrounding outer peripheral edges to the thickest position of thickness, promptly near the position the top of the inboard rake the most inboard folding part from three sides, uprise the ground displacement in turn, make top not produce fold from three sides encirclement outer peripheral edges side to inboard rake.In addition, the wall thickness dimension that is provided with the position of folding part is set at, expansion is flowed into gas, guarantee the specific thickness size and finish when expanding, can suppress in the scope of the outside face side upset in folding part.Therefore, owing to can not overturn in the mode that outside face side is protruded in the folding part of expanding when finishing, the part produces fold in the folding part of expanding when finishing so also can be suppressed at.

Thus, in resin air bag involved in the present invention, can be when expansion be finished, be suppressed at three sides and surround in outer peripheral edges and the inboard expansion area that is provided with the folding part and produce fold, successfully expand and finish expansion.

And, in resin air bag involved in the present invention, the section shape along the thickness direction of described air bag of preferred described each folding part forms respectively, the bottom that makes described folding part surrounds the inboard skew of outer peripheral edges away from described three sides from the mediad along the Width of described folding part, angle of inclination for two rakes that extend to both sides from described bottom from described bottom surface sections rising, surround the described rake of outer peripheral edges side with described three sides and compare, inboard described rake is bigger.

Utilize said structure, across the both sides of bottom surface rake, expanding when flowing in the folding part, bear respectively and the pressure of the outside expansion of the direction of the inner peripheral surface side quadrature of air bag with gas with gas.The pressure of this moment is divided into: " outwards component ", it outwards acts on along thickness direction; And " along the surperficial component " that cancels each other out, they are along the Width of folding part, that is, along with a side wall portion of the air bag of the thickness direction quadrature of air bag and the surface of another side wall portion.And three less sides of angle of inclination are surrounded the rake of outer peripheral edges side, compare with the rake of inboard, corresponding to the pressure that expands with gas, to bear outside component with the corresponding larger proportion in less angle of inclination.And, because the bottom is offset to the inboard that surrounds outer peripheral edges away from three sides,, this three side compares with the rake of inboard so surrounding the rake of outer peripheral edges side, bigger along the area of conter of thickness direction.In addition, the rake that three sides are surrounded the outer peripheral edges side is configured in the outer edge side that surrounds the outer peripheral edges side as three sides, compares with the rake of inboard, and the area itself that surrounds the outer peripheral edges side along three sides is also bigger.Its result in the air bag of said structure, can promptly make the folding part move to the direction that expands, and can promptly expand.

In addition, if with differently above-mentioned, the bottom of folding part is surrounded the outer peripheral edges lateral deviation from mediad three sides of the Width of folding part dispose with moving, then corresponding and bear the rake of outside component with the pressure of gas with bigger ratio with expansion, become the position of extending to the inside from the bottom.But, because this inboard rake compares with the rake in the outside, be positioned at the inboard that surrounds outer peripheral edges away from three sides, so its result, air bag becomes less area under whole observation, in that air bag is expanded rapidly is relatively poor on this respect.

And, as mentioned above, for the section shape of folding part, in the bottom along the Width of folding part from central authorities to the inside under the out-of-position situation, a plurality of described folding parts form, and along with surrounding outer peripheral edges from inboard near described three sides, the cup depth of described bottom deepens.

Utilize said structure, the position that increases thickness at first stably can be set near the top of inboard rake of the most inboard folding part.Promptly, when expansion flows into gas, three sides of air bag are surrounded a side wall portion and another side wall portion in the outer peripheral edges, crossing angle is each other enlarged, on one side two rakes crossing angle each other across the bottom in each folding part is enlarged, perhaps, top side and the crossing angle on every side of rake is enlarged, thereby gauge is increased.And, near the top of the inboard rake of the most inboard folding part, because the total of the crossing angle of above-mentioned expansion and thickness increases.Therefore, at the expansion initial stage of air bag, intersect the effect of the displacement of angle by adding up, can make near the top of inboard rake of the most inboard folding part, reliably and stably a side wall portion and another side wall portion from air bag protrudes, and thickness is increased.

And, in resin air bag involved in the present invention, preferably be configured under the two the situation of a side wall portion and another side wall portion in the folding part, with the bottom of the depression of folding part between a side wall portion and another side wall portion, with the direction of thickness direction quadrature on the configuration of staggering.In said structure, the bottom of the folding part in a side wall portion and the opposite side arm is not overlapping on thickness direction each other.Therefore, the resin air bag can make the gauge when accommodating less and constitute, even external force action on the direction that gauge is diminished and make air bag distortion, also can prevent to contact with each other near the bottom of the folding part in a side wall portion and another side wall portion abnormal sound that generates when being difficult to be created in contact as far as possible.Certainly, in said structure, even deepen owing to make the degree of depth of the folding part of a side wall portion and another side wall portion, the bottom of the folding part in one side wall portion and another side wall portion with the direction of thickness direction quadrature on stagger, be difficult to butt each other, therefore, can suppress the gauge of resin air bag when accommodating increases, and can accommodate compactly.

And, in resin air bag involved in the present invention, also flank can be set, it links a side wall portion and another side wall portion, and it is closer to each other to limit a side wall portion and another side wall portion.Above-mentioned flank is outer peripheral edges from the edge with the direction of the thickness direction quadrature of air bag, across gap configuration, and, be configured to when airbag inflation, remove the binding between a side wall portion and another side wall portion.

In above-mentioned resin air bag,, also can utilize flank to prevent that the relative side wall portion from contacting with another side wall portion on every side even from pushing to the direction that thickness is dwindled.In addition, flank is that outer peripheral edges are across gap configuration, rather than from outer peripheral edges configuration continuously mutually from the edge with the direction of the thickness direction quadrature of air bag.Therefore, when thickening expands near away from the central authorities of outer peripheral edges air bag, near the zone till from outer peripheral edges to flank, can suppress the fold generation, successfully expand.In addition, if begin to dispose flank continuously mutually from the outer peripheral edges of resin air bag, when then making airbag inflation carrying out plastic deformation, the rigidity the zone from outer peripheral edges to flank is too high, is easy to generate fold.And, if produce fold, then in this position, produce stress concentration, produce and cause the hole that leaks gas, therefore, not preferred.

And, if flank is set, spacing distance between one side wall portion and another side wall portion is increased, in the outer peripheral edges of the air bag that links a side wall portion and another side wall portion, compare with the situation that the spacing distance between a side wall portion and another side wall portion is less, can make curvature become big and link a side wall portion and another side wall portion.Therefore, when airbag inflation, expand with a side wall portion and another side wall portion mode separated from one another, edge portion in the outer peripheral edges of the air bag between a side wall portion and another side wall portion, when each other crossing angle enlarges, can be the center with the position away from the top respectively, carry out the bending ductility distortion, wherein, this top is the tops of the outer peripheral edges of air bag along the section of thickness direction.Its result in the resin air bag, can suppress the stress concentration in the outer peripheral edges and is out of shape, and can suppress outer peripheral edges and damage.

Thus, in being provided with the resin air bag of above-mentioned flank, may be limited to wall portion relative on the thickness direction and when accommodating, contact each other, can prevent to produce abnormal sound.In addition, in being provided with the resin air bag of above-mentioned flank,, also can suppress the generation that near the zone between outer peripheral edges and the flank fold and outer peripheral edges are damaged, can successfully expand even form the structure carry out plastic deformation and to expand.And, if flank is configured to, when airbag inflation, remove the binding between a side wall portion and another side wall portion, then can make a side wall portion and the spacing distance between another side wall portion when expanding become big, can so that the gauge of air bag increase and expand.

In addition, air bag will expand with gas from upstream side downstream side flow direction as with the direction of the thickness direction quadrature of air bag, make the gas supply sidepiece that expands and between a side wall portion and another side wall portion, flow with gas, be configured in the relative edge outer peripheral edges side each other of surrounding outer peripheral edges away from three sides that link edge, in the case, flank is a plurality of to the upstream side configuration with the downstream of gas from supply with the mobile expansion of sidepiece from gas.And, expand with the upstream side of gas and the ordered state of the flank between the downstream as being configured in, preferably these flanks are set at, the flank of upstream side is configured in to cover and expands with on the position of gas, and this expansion is flowed with linearity with respect to being configured in the flank of expansion with the downstream of gas with gas.

Utilize said structure, because the expansion of the flank streamlined flow of side is downstream covered with the flank of gas by upstream side, so the flank in downstream is not expanded with the influence of gas flow, can easily be set at, the flank of upstream side is compared the binding of earlier removing between a side wall portion and another side wall portion with the flank in downstream.In other words, in the air bag of said structure, can easily the position in the thickening expansion at first of expansion initial stage be set near the flank of upstream side.

In this case, preferably will be configured in from the expansion a plurality of flanks configuration multiple rows of the upstream side of gas to the downstream, being configured in separately of each row expanded, and to be configured to encompasses inflation be the thickest expansion area for flank with the upstream side of gas, and respectively the flank in the downstream that is listed as is configured in from the position of expansion area with radial expansion.

In said structure, can be configured in by near the central authorities with the air bag that a plurality of flank was surrounded of radial configuration being expanded to the thickest expansion area, can make this expansion area successfully begin to expand from the expansion initial stage, and, suppress fold and produce, successfully be expanded to the thickest.

And in the resin air bag of said structure, the side end that preferred flank will extend to the thickness direction of air bag and is connected near the top of rake in the folding part of a side wall portion or another side wall portion.

In said structure, near the top of the rake that protrudes from the outside face side most of folding part, dispose flank, thereby directly support near the top of pushing easily by flank, be difficult to depression.Therefore, can prevent near the local dent top of resin air bag reliably and produce abnormal sound when shriveling.

Description of drawings

Fig. 1 is the summary longitudinal diagram of the state that carries to seat of the airbag apparatus of the expression resin air bag that uses the 1st embodiment involved in the present invention.

Fig. 2 is the approximate vertical view after the resin air bag of the 1st embodiment is assembled charging blower.

Fig. 3 is the summary upward view after the resin air bag of the 1st embodiment is assembled charging blower.

Fig. 4 is the summary longitudinal diagram of the resin air bag of the 1st embodiment, and is corresponding with the IV-IV position of Fig. 2.

Fig. 5 is near the amplification end view drawing in folding part of the resin air bag of the 1st embodiment.

Fig. 6 is the figure of swelling state that the resin air bag of the 1st embodiment is described in turn.

Fig. 7 is the approximate vertical view of the resin airbag inflation of the 1st embodiment when finishing.

Fig. 8 is the summary longitudinal diagram of the airbag apparatus action of the expression resin air bag that uses the 1st embodiment when finishing.

Fig. 9 is the summary longitudinal diagram of the state that carries to seat of the airbag apparatus of the expression resin air bag that uses the 2nd embodiment.

Figure 10 is the approximate vertical view after the resin air bag of the 2nd embodiment is assembled charging blower.

Figure 11 is the summary upward view after the resin air bag of the 2nd embodiment is assembled charging blower.

Figure 12 is the summary longitudinal diagram of charging blower of the resin air bag of the 2nd embodiment, and is corresponding with the XII-XII position of Figure 10.

Figure 13 is near the amplification end view drawing in folding part of the resin air bag of the 2nd embodiment.

Figure 14 is the figure of swelling state that the resin air bag of the 2nd embodiment is described in turn.

Figure 15 is the approximate vertical view of the resin airbag inflation of the 2nd embodiment when finishing.

Figure 16 is the summary longitudinal diagram of the airbag apparatus action of the expression resin air bag that uses the 2nd embodiment when finishing.

Figure 17 is the approximate vertical view after the resin air bag of the 3rd embodiment is assembled charging blower.

Figure 18 is the summary upward view after the resin air bag of the 3rd embodiment is assembled charging blower.

Figure 19 is the state that carries to door portion of the airbag apparatus of the expression resin air bag that uses the 3rd embodiment and the summary longitudinal diagram of expression action completion status.

Figure 20 is the approximate vertical view after the resin air bag of the 4th embodiment is assembled charging blower.

Figure 21 is the summary upward view after the resin air bag of the 4th embodiment is assembled charging blower.

Figure 22 is the state that carries to door portion of the airbag apparatus of the expression resin air bag that uses the 4th embodiment and the summary longitudinal diagram of expression action completion status.

Figure 23 is the approximate vertical view of the resin air bag of expression the 1st variation.

Figure 24 is the summary longitudinal diagram of the resin air bag of expression the 1st variation, and is corresponding with the XXIV-XXIV position of Figure 23.

Figure 25 is the state that carries to seat of the airbag apparatus of the expression resin air bag that uses the 1st variation and the summary longitudinal diagram of expression action completion status.

Figure 26 is the approximate vertical view of the resin air bag of expression the 2nd variation.

Figure 27 is the summary longitudinal diagram of the resin air bag of expression the 2nd variation, and is corresponding with the XXVII-XXVII position of Figure 26.

Figure 28 is the summary longitudinal diagram of the resin air bag of expression the 2nd variation, and is corresponding with the XXVIII-XXVIII position of Figure 26.

Figure 29 is the state that carries to door portion of the airbag apparatus of the expression resin air bag that uses the 2nd variation and the summary longitudinal diagram of expression action completion status.

Figure 30 is the summary longitudinal diagram of the resin air bag of expression the 3rd variation.

Figure 31 is the summary longitudinal diagram of the resin air bag of expression the 4th variation.

Figure 32 is the state that carries to door portion of the airbag apparatus of the expression resin air bag that uses the 4th variation and the summary longitudinal diagram of expression action completion status.

Figure 33 is the airbag apparatus of the resin air bag of expression use the 5th variation carries an approximate vertical view from state to seat.

Figure 34 is the summary longitudinal diagram of the resin air bag of expression the 5th variation, and is corresponding with the XXXIV-XXXIV position of Figure 33.

Figure 35 is the summary longitudinal diagram of the resin air bag of expression the 5th variation, and is corresponding with the XXXV-XXXV position of Figure 33.

Figure 36 is the summary longitudinal diagram when representing to use state that the airbag apparatus of the resin air bag of the 5th variation carries to seat and action to finish in turn.

The specific embodiment

With reference to accompanying drawing, record and narrate the preferred embodiments of the present invention below.But the present invention is not limited to the embodiment that recorded and narrated.All changes of appended claims and the form that is equal to it all are included within the scope of claims.

Use the 1st embodiment resin air bag (being designated hereinafter simply as air bag) 20 airbag apparatus S1 as shown in Figure 1, carry in having vehicle seat used 1 seat portion 3 of back-rest 2 and seat portion 3.And, this airbag apparatus S1 is the airbag apparatus of anti-fall usefulness, when the frontal collision of vehicle, make the anterior 3a side direction top protuberance of seat portion 3, even occupy that the downslide phenomenon takes place for passenger M on the seat portion 3 of seat 1 on seat portion 3 forwards side slide, also bear the toe lateral back side of huckle T, thereby be limited in forwards slide on the seat portion 3 (with reference to Fig. 8) by the anterior 3a side of protuberance.

In addition, the downslide phenomenon takes place in the following cases easily, that is, there is the seatbelt 10 of seat safety belt apparatus 9 in the passenger M system of taking one's seat, and back-rest 2 rearward falls down significantly.Seat safety belt apparatus 9 has seatbelt 10 and bracelet 12 and constitutes.If tongue piece 11 and bracelet 12 are fastenedly connected, then seatbelt 10 never graphic is hinged to the shoulder hamess 10a till the tongue piece 11, the fixing upper part of the body U of passenger M, it is not forwards moved, knee safety strap 10b till from tongue piece 11 to the fixed position of fixing to not shown floor, fixedly the waist W of passenger M and huckle T limit it and are moved upward or move in the place ahead.

The seat portion 3 of seat 1 constitutes, and the upper surface 4a side of the seat plate of making at sheet metal 4 across the air bag 20 of airbag apparatus S1 and configuration seat cushion 6, disposes the epidermis 7 of fabric etc. around seat cushion 6.And under the situation of the 1st embodiment, airbag apparatus S 1 expands the air bag 20 of the upper surface 4a side that is positioned in seat plate 4 as shown in Figure 8, thereby makes the anterior 3a side protuberance of seat portion 3.

Airbag apparatus S1 has following parts and constitutes shown in Fig. 1～4: air bag 20, and it is made of laminar synthetic resin such as polyamide or polypropylene; Charging blower 15, it is configured in the trailing edge 20b side of air bag 20; And the hill holder 17 of tubulose.

Charging blower 15 produces the expansion gas G that air bag 20 is expanded, the head 15b that has columned main part 15a and insert the front path in the hill holder 17, and configuration makes the gas vent 15c that expands with gas G ejection on head 15b.Main part 15a is when the frontal collision of vehicle, and never graphic lead-in wire is imported from the actuating signal of the air bag actuating circuit of regulation and moved, then, and from gas vent 15c ejection expansion gas G.

Hill holder 17 extends along left and right directions, constitutes cylindric with the left end side obturation by inaccessible wall 17b, and charging blower 15 is inserted from the right of opening side.Two ends, the left and right sides form installation position 17a, the 17c that not shown anchor clamps are installed across the trailing edge 20b side of air bag 20 described later, these anchor clamps are fixed on the seat plate 4.On the middle part between installation position 17a, the 17c, along a plurality of opening 17d of the axial arrangement of hill holder 17, they will expand and supply with to the front side of air bag 20 sides with gas G.

In addition, hill holder 17 also can be a metallic, but under the situation of present embodiment, is formed by material and air bag 20 identical synthetic resin.And hill holder 17 is the deposited or bonding with air bag 20 easily, and the trailing edge 20b side of fastening air bag 20.

In addition, charging blower 15 utilizes above-mentioned not shown anchor clamps, is crimped on securely on the 17c of installation position, and leak tightness is kept by hill holder 17 well, utilizes hill holder 17 to be fixed on seat plate 4 sides.In addition, stably fix, also can use not shown support in addition, charging blower 15 directly is fixed on seat plate 4 sides to seat plate 4 sides in order to make charging blower 15.

Air bag 20 utilizes laminar synthetic resin such as polyamide or polypropylene to constitute perisporium 21, flows into gas G by expanding and expands, feasible each other on thickness direction a relative side wall portion be that upper wall portions 22 is that lower wall portion 23 separates with another side wall portion.Air bag 20 is fixed on the fixedly side edge part 24 of seat plate 4 sides with the linearity of trailing edge 20b side formation along left and right directions as utilizing hill holder 17.The air bag 20 fixedly front side of side edge part 24 forms expansion area 25, and it makes upper wall portions 22 and lower wall portion 23 separated from one another when expanding with gas G inflow, makes the gauge thickening of above-below direction.

And the outer peripheral edges of expansion area 25 constitute and form three sides and surround outer peripheral edges 26, and it has: two relative edge 26a, 26a, they along on the Width of the left and right directions of air bag 20 relatively; And linking edge 26b, it links two relative edge 26a, 26a.In other words, under the situation of present embodiment, three sides are surrounded outer peripheral edges 26 and are constituted, and except the trailing edge 29b of air bag 20, have: left border 20c and right border 20d, and their conducts are relative edge 26a relative on the left and right directions at Width; And leading edge 20a, it is as linking edge 26b.

In addition, this three side surround outer peripheral edges 26 along the section of thickness direction shown in Fig. 4,5, upper wall portions 22 and lower wall portion 23 are linked with the semicircle arcuation, and, shown in Fig. 2,3, form the consecutive curve-like that expands laterally under the observation overlooking.In addition, under the situation of present embodiment, as followsly between upper wall portions 22 and the lower wall portion 23 carry out combination, promptly, as the bonding state that surrounds in three sides in the outer peripheral edges 26, link in the mode that forms the semicircle arcuation, the diameter dimension D (with reference to Fig. 5) of this semicircle arcuation equates with the gauge T0 (with reference to the A of Fig. 6) of the preceding air bag 20 that expands.

In addition, in the expansion area 25 of being surrounded, on upper wall portions 22 and lower arm part 23, dispose folding part 28,33 respectively to the thickness direction depression of air bag 20 by three sides encirclement outer peripheral edges 26.Folding part 28 (28A, 28B, 28C), 33 (33A, 33B, 33C) are a plurality of (in the present embodiment towards the configuration of inner concentric ground respectively, be respectively 3), overlook under the observation, form along three sides and surround outer peripheral edges 26 and surround the curve-like that outer peripheral edges 26 sides expand to three sides.Above-mentioned each folding part 28,33 forms the V word shape of 29,34 and two rakes 30,31,35,36 in bottom with depression separately along the section shape of the thickness direction of air bag 20, wherein, two rakes 30,31,35,36 29,34 extend in the mode of launching to both sides from the bottom.In addition, above-mentioned each folding part 28,33 is configured in central 28a, the 33a of left and right directions foremost respectively, terminal 28b, the 33b of the left and right sides is configured to, near fixing side edge part 24 and along the left and right directions shape that is arranged in a straight line.

In addition, in the 1st embodiment, in each folding part 28,33, form along the section shape of the thickness direction of air bag 20, respectively with the central authorities of bottom 29,34, to the inboard skew of surrounding outer peripheral edges 26 away from three sides from 28,33 Widths along the folding part.Promptly, each folding part 28,33 forms, 29,34 tilt angle theta f, the θ b (with reference to Fig. 5) that rise for 29,34 two rakes 30,31,35,36 that extend to both sides from the bottom from the bottom, surround the rake 30,35 of outer peripheral edges 26 sides with three sides and compare, inboard rake 31,36 is big (θ f＜θ b) (with reference to Fig. 5).

In addition, in the 1st embodiment, each folding part 28,33 forms respectively, along with surrounding outer peripheral edges 26 from the inboard near three sides, bottom 29,34 cup depth size dU2, dU1, dU0, dD2, dD1, dD0 deepens (dU2＜dU1＜dU0, dD2＜dD1＜dD0) as shown in Figure 5.

And in the 1st embodiment, folding part 28,33 is configured in upper wall portions 22 and lower wall portion 23 on the two, and, the bottom 29,34 of the depression of folding part 28,33 is configured to, between upper wall portions 22 and lower wall portion 23, with the direction of thickness direction quadrature on stagger.

And the position that folding part 28,33 is set is that the wall thickness dimension t of expansion area 25 is set at, and flows into gas G making to expand, and guarantees specific thickness size T1 and finishes when expanding, and suppresses in the scope that folding part 28,33 outside face side overturn.Certainly, this gauge t also is set at, make when air bag 20 flows into expansion with gas G, plastic deformation is carried out on one side in each folding part 28,33, Yi Bian make A/F size WU1, WU2, WU3, WD1, WD2, WD3 (with reference to Fig. 5) expand into A/F size WU10, WU20, WU30, WD10, WD20, WD30 (with reference to the C of Fig. 6).

Under the situation of present embodiment, air bag 20 is set at, gauge T0 before monomer is expanded is about 25～32mm, makes expand interior pressure value when finishing finish expansion about for 230Kpa, and the gauge T1 of air bag 20 monomers of this moment is about 115～130mm.And air bag 20 is a polyamide system, and wall thickness dimension t is 0.5～2.2mm.And, in the air bag 20 of present embodiment, making percentage elongation (D638) is 40～200%, crooked elastic rate (D790) is 1000～3000MPa, even effect gravity, the whole zone of upper wall portions 22 can not be out of shape in crooked to the lower side mode yet, guarantees to keep the shape retention of global shape.

In addition, the air bag 20 of present embodiment forms by blow molding.And, in this air bag 20, if make hill holder 17 insert the fixedly interior week of side edge part 24, and hill holder 17 is fastened on fixedly on the side edge part 24, and insertion charging blower 15 in hill holder 17 thus, can be assembled airbag apparatus S1 by deposited etc.If utilize not shown anchor clamps to be fixed on the seat plate 4 in the seat portion 3 of seat 1 installation position, left and right sides 17a, the 17c of hill holder 17, then the airbag apparatus S1 after the assembling can be assembled on the seat 1.Then, if will be connected to the regulation lead-in wire and charging blower 15 lines of not shown air bag actuating circuit, simultaneously seat cushion 6 and epidermis 7 are assembled in the upper surface side of seat portion 3, with lead-in wire and not shown air bag actuating circuit line, and seat 1 is assembled on the floor of vehicle, thus, airbag apparatus S1 can be carried on vehicle.

With airbag apparatus S1 after vehicle boarded, if the frontal collision of vehicle, make airbag apparatus S1 action, then charging blower 15 expands from gas vent 15c ejection and uses gas G, and expanding flows in the expansion area 25 of air bag 20 from each opening 17d of hill holder 17 with gas G.

And, as the air bag 20 of the 1st embodiment, flow into gas G if make to expand, then shown in A～C of Fig. 6, making a side wall portion is that upper wall portions 22 and another side wall portion are that lower wall portion 23 is separated from one another, increases thickness and expands so that gauge T0 becomes the mode of gauge T1.At this moment, three sides are surrounded upper wall portions 22 and the lower wall portion 23 in the outer peripheral edges 26, crossing angle θ 0 is each other enlarged (with reference to the B of Fig. 6, C), make each folding part 28 on one side, in 33 across bottom 29, two rakes 30 of 34,31 and two rakes 35,36 each other crossing angle θ U1, θ U2, θ U3, θ D1, θ D2, θ D3 (with reference to Fig. 4) enlarges, perhaps, make rake 30,31,35,36 top 30a, 31a, 35a, the 36a side and crossing angle [alpha] U0 on every side, α U1, α U2, α U3, α D0, α D1, α D2, α D3 (with reference to Fig. 4) enlarges, thereby makes gauge T0 increase to gauge T1.In other words, each folding part 28,33 is carried out plastic deformation on one side, A/F size WU1, WU2, WU3, WD1, WD2, WD3 (with reference to Fig. 5) are extended to A/F size WU10, WU20, WU30, WD10, WD20, WD30 (with reference to the C of Fig. 6) on one side, thereby make gauge T0 increase to gauge T1.

And, in the air bag 20 of the 1st embodiment, when expanding, three sides are surrounded outer peripheral edges 26 and are not had straight line portion, form the consecutive curve-like that expands laterally, in addition, a side wall portion is that upper wall portions 22 and another side wall portion are that lower wall portion 23 links with the semicircle arcuation.Therefore, in air bag 20, surround on the outer peripheral edges 26 as shown in Figure 7, be difficult to produce local the depression to the inside and the fold that generates in three sides.In addition, a plurality of folding parts 28 of expansion area 25 (28A, 28B, 28C), 33 (33A, 33B, 33C) also form along three sides and surround outer peripheral edges 26 and surround the curve-like that outer peripheral edges 26 sides expand to three sides, to the inside configuration with one heart.Therefore, air bag 20 surrounds outer peripheral edges 26 to the thickest position of thickness, promptly near top 31Ca, the 36Ca of the inboard rake 31 (31C) the most inboard folding part 28C, the 33C, 36 (36C) from three sides, make top 30a, 31a, 35a, 36a can uprise the ground displacement in turn, and can not produce fold from three sides encirclement outer peripheral edges, 26 sides to inboard rake 30,31,35,36.In addition, the wall thickness dimension t that is provided with the expansion area 25 of folding part 28,33 is set at, expansion is flowed into gas G, when guaranteeing specific thickness size T0 and finishing expansion, in the scope of the upset of inhibition folding part 28,33 outside face side, can not overturn in the mode that outside face side is protruded in folding part 28,33 when expansion is finished, therefore, air bag 20 also can be suppressed at the local fold that produces on the folding part 28,33 that expands when finishing.

Thus, in the air bag 20 of the 1st embodiment, three sides that can be suppressed at expands when finishing are surrounded in outer peripheral edges 26 and the inboard expansion area 25 thereof and are produced fold, can successfully expand and finish expansion.

And, among the airbag apparatus S1 when release, as shown in Figure 8, the lower surface 20f of air bag 20 is supported on the seat plate 4, can be in the mode that roughly correspondingly uprises with gauge T 1 (with reference to the C of Fig. 6), the anterior 3a that makes seat portion 3 is from seat plate 4 bump height H.Its result, even the passenger M that is seated on the seat portion 3 of seat 1 produces the downslide phenomenon, forwards side is slided on seat portion 3, and slip forwards on the seat portion 3 is suitably limited at the toe lateral back side that airbag apparatus S1 also can bear huckle T by the anterior 3a side of protuberance.

In addition, in the air bag 20 of the 1st embodiment, the section shape along the thickness direction of air bag 20 in each folding part 28,33 is, the bottom 29,34 that makes folding part 28,33 respectively is from the central authorities of 28,33 the Width along the folding part, to the inboard skew of surrounding outer peripheral edges 26 away from three sides.And, each folding part 28,33 forms, for from bottom 29,34 to two rakes 30,31,35,36 that extend both sides, 29,34 tilt angle theta f, the θ b that rise from the bottom, surround the rake 30,35 of outer peripheral edges 26 sides with three sides and compare, inboard rake 31,36 is bigger.Utilize said structure, the rake 30,31,35,36 of the both sides that form across bottom 29,34 in folding part 28,33 is expanding when flowing into gas G, bears respectively and the pressure GF of the outside expansion of the direction of the inner peripheral surface side quadrature of air bag 20 with gas G.The pressure GF of this moment is divided into: " outwards component " VF, it outwards acts on along thickness direction; And " along surperficial component " LFF, LFB that cancels each other out, they are 28,33 Width along the folding part, that is, along with the upper wall portions 22 of the air bag 20 of the thickness direction quadrature of air bag 20 and the surface (upper surface 20e and lower surface 20f) (with reference to Fig. 5) of lower wall portion 23.And, three less sides of tilt angle theta f are surrounded the rake 30,35 of outer peripheral edges 26 sides, compare with the rake 31,36 of inboard, corresponding to the pressure that expands with gas G, to bear outside component (VF=GF * cos θ f＞GF * cos θ b (this is owing to the θ f＜θ b less than 90 °)) with the corresponding larger proportion of less tilt angle theta f.And, because bottom 29,34 is compared with the rake 31,36 of inboard so this three side is surrounded the rake 30,35 of outer peripheral edges 26 sides, along the area of conter (SHAf＞SHAb) bigger of thickness direction to the inboard skew of surrounding outer peripheral edges 26 away from three sides.In addition, the rake 30,35 that three sides are surrounded outer peripheral edges 26 sides is configured in the outer edge side that surrounds outer peripheral edges 26 sides as three sides, compare with the rake 31,36 of inboard, surround the area itself of outer peripheral edges 26 sides also big (with reference to the zone of the rake 30 of the SAf shown in the oblique line of Fig. 2＞) with the zone of the rake 31 of the SAb shown in the point-like of Fig. 2 along three sides.Its result in the air bag 20 of said structure, can promptly make folding part 28,33 move to the direction that expands, and can promptly expand.

In addition, if with differently above-mentioned, bottom 29,34 with folding part 28,33, mediad three sides of 28,33 Width encirclement outer peripheral edges 26 lateral deviations dispose with moving from the folding part, then corresponding and bear the rake 31,36 of outside component VF with bigger ratio with the pressure with gas of expanding, become the position of extending to the inside from the bottom.But, because this inboard rake 31,36 compares with the rake 30,35 in the outside, be positioned at the inboard that surrounds outer peripheral edges 26 away from three sides, so its result, air bag becomes less area under whole observation, in that air bag is expanded rapidly is relatively poor on this respect.

And, in the 1st embodiment, the section shape of folding part 28,33 forms, bottom 29,34 is from the inboard skew of the mediad of 28,33 the Width along the folding part, and, each folding part 28,33 is along with surrounding outer peripheral edges 26 from the inboard near three sides, and cup depth size dU2, dU1, dU0, dD2, dD1, the dD0 of bottom 29,34 deepened (dU2＜dU1＜dU0, dD2＜dD1＜dD0).

Utilize said structure, the position that increases thickness at first stably can be set near top 31Ca, the 36Ca of inboard rake 31C, 36C in the most inboard folding part 28,33.Promptly, when expanding with gas G inflow, three sides of air bag 20 are surrounded upper wall portions 22 and the lower wall portion 23 in the outer peripheral edges 26, crossing angle θ 0 is each other enlarged, on one side with each folding part 28, in 33 across bottom 29, two rakes 30 of 34,31 and two rakes 35,36 each other crossing angle θ U1, θ U2, θ U3, θ D1, θ D2, θ D3 enlarges, perhaps, make rake 30,31,35,36 top 30a, 31a, 35a, the 36a side and crossing angle [alpha] U0 on every side, α U1, α U2, α U3, α D0, α D1, α D2, α D3 enlarges.Its result, the gauge T0 of air bag 20 increases to gauge T1.And, near top 31Ca, the 36Ca of inboard rake 31C, the 36C of the most inboard folding part 28C, 33C in the air bag 20, because the total of the crossing angle of above-mentioned expansion and thickness increases.Therefore, at the expansion initial stage of air bag 20, shown in Fig. 6 B, the effect of the displacement of intersecting angle by adding up, can make near top 31Ca, the 36Ca of inboard rake 31C, 36C of the most inboard folding part 28C, 33C, reliably and stably upper wall portions 22 and the lower wall portion 23 from air bag 20 protrudes, and thickness is increased.

In addition, in the 1st embodiment, make the top 31Ca of rake 31C be in from expansion initial stage of air bag 20 just can be suitably the fixing mode on the allocation position of the anterior rear side of the huckle T of passenger M, it is configured in the anterior 3a side of seat portion 3.

And, in the air bag 20 of the 1st embodiment, it is that upper wall portions 22 and another side wall portion are that lower wall portion 23 is on the two that folding part 28,33 is configured in a side wall portion, the bottom 29,34 of the depression of folding part 28,33 is configured to, between upper wall portions 22 and lower wall portion 23, with the direction of thickness direction quadrature on stagger.Therefore, the gauge T0 that air bag 20 constitutes when accommodating is less, even make the air bag distortion to the directive effect external force that gauge is reduced, also can prevent from as far as possible to be in contact with one another near the bottom 29,34 of the folding part 28,33 in upper wall portions 22 and the lower wall portion 23, the abnormal sound that produces when making contact is difficult to occur.Certainly, utilize said structure, even depth dimensions dU0, dU1, dU2, dD0, dD1, the dD2 of the folding part 28,33 in upper wall portions 22 and the lower wall portion 23 are darker, also since the bottom 29,34 of the folding part 28,39 in upper wall portions 22 and the lower wall portion 23 mutually with the direction of thickness direction quadrature on stagger, be difficult to contact each other, therefore, the gauge T0 in the time of can suppressing air bag 20 and accommodate increases, and makes to carry on vehicle air bag 20 and the space compactness of accommodating.

Certainly, if do not consider above-mentioned aspect, then also can be configured to, making and being arranged on a side wall portion is that upper wall portions 22 and another side wall portion are that the bottom 29,34 of the folding part 28,33 in the lower wall portion 23 is overlapping on thickness direction.And, under the less also passable situation of the gauge T1 of the air bag when expansion is finished, also can be only a side wall portion be upper wall portions 22 or another side wall portion be lower wall portion 23 one on a plurality of folding parts 28,33 are set.

In addition, in the air bag 20 of the 1st embodiment, show the air bag that constitutes the shape retention that to guarantee monomer, but shown in the air bag 20A of the airbag apparatus S2 of the 2nd embodiment that also can be shown in Fig. 9～16, be that upper wall portions 22A and another side wall portion are that configuration prevents a plurality of flanks 38 that upper wall portions 22A subsides between the lower wall portion 23A at a side wall portion.Because above-mentioned flank 38 prevents that upper wall portions 22A from subsiding downwards, thus even the heavier passenger M of body weight sits down with sudden force, can prevent that also upper wall portions 22A from subsiding and contact with lower wall portion 23A downwards on seat portion 3, thus the generation abnormal sound.

This flank 38 constitutes, and can separate when air bag 20A expands.Under the situation of the 2nd embodiment, upper wall portions 22A and lower wall portion 23A use synthetic resin such as polyamide, in advance hill holder 17A are formed two parts up and down, and form by injection mo(u)lding respectively.And, this air bag 20A with two minutes upper wall portions 22A and three sides among the lower wall portion 23A surround outer peripheral edges 26 and fixedly side edge part 24 the position each other and with the position of two minutes hill holder 17A each other, utilize deposited or the bonding and combination securely, in addition, the front end 38b of flank 38 combines with lower wall portion 23A separatably.

In addition, this flank 38 also can protrude from lower wall portion 23A, combines with upper wall portions 22, perhaps from upper wall portions 22A and the two protrusion of lower wall portion 23A, the protruding end is bonded to each other.

In detail, in the air bag 20A of the 2nd embodiment, with a side wall portion is that upper wall portions 22A and another side wall portion are that lower wall portion 23A links, to limit the approximating flank 38 of upper wall portions 22A and lower wall portion 23A, from with the direction of the thickness direction quadrature of air bag 20A on edge portion be outer peripheral edges 21a, a plurality of across gap configuration.Each flank 38 forms rectangular tabular, constitutes, and when air bag 20A expands, removes the binding between upper wall portions 22A and the lower wall portion 23A.The wall thickness dimension t1 (with reference to Figure 13) of each flank 38 is set at, even heavier passenger M sits down to seat portion 3 with sudden force, upper wall portions 22A is contacted with lower wall portion 23A.

In addition, under the situation of present embodiment, base end 38a side and the upper wall portions 22A of the upper wall portions 22A of each flank 38 are one-body molded, by deposited or bonding, front end 38b and lower wall portion 23A side are linked, when air bag 20A expands, front end 38b is peeled off from lower wall portion 23A.

In addition, the air bag 20A of the 2nd embodiment, upper wall portions 22A side is with flank 38 and fixing side edge part 24 last half side, form by injection mo(u)lding integratedly, lower wall portion 23A side is following half side with fixing side edge part 24, form by injection mo(u)lding integratedly, the upper wall portions 22A side of injection mo(u)lding and lower wall portion 23A side will comprise fixedly side edge part 24 at the position of the interior outer peripheral edges 21a (22a of edge portion, 23a) the combination securely by vibration deposited or bonding such as deposited each other, engaging more weak binding force than this, utilize the front end 38b of each flank 38 deposited or bonding and combining with lower wall portion 23A.

In addition, in the 2nd embodiment,, base end 38a is connected with the top 31a of the folding part 28 medium dip portions 31 of upper wall portions 22A is neighbouring, front end 38b is extended to lower wall portion 23A side as each flank 38.

And, in the 2nd embodiment, each flank 38 is from supplying with sidepiece 27 (under the situation of present embodiment from gas, for being assembled with the fixedly side edge part 24 of charging blower 15) expansion of flowing with the upstream side of gas G to the downstream, be arranged as upstream side flank 39, intermediate ribs 40 and downstream flank 41 in turn, and configuration multiple row (being three row in the present embodiment).And, under the situation of present embodiment, the upstream side flank 39 that being configured in respectively of each row expanded with the upstream side of gas is configured to, and encompasses inflation is the thickest expansion area 25, and the downstream flank 41 of each row is configured in from the position of expansion area 25 with radial expansion.

And, under the situation of present embodiment, shown in Figure 10,11, as being configured in the ordered state that expands with the flank 38 in the upstream side of gas G and downstream, be set at following manner, that is, the flank configuration of upstream side can be covered on the position of expanding with gas G (GL, GM, GR), this expansion is flowed with linearity with respect to being configured in the flank of expansion with the downstream of gas G with gas G.Promptly, under the situation of present embodiment, in a plurality of flanks 38, for near the upstream side flank 39L the top 31a that is configured in the 28C of folded inside portion, be configured near the intermediate ribs 40L of top 31a of folding part 28B, and near the downstream flank 41L of top 31a that is configured in the 28A of folded portion, so that the mode of extending with radial oblique left the place ahead from expansion area 25 in row is configured.And, the upstream side flank 39L of upstream side is configured in and can covers on the position of expanding with gas GL, the intermediate ribs 40L in gas G downstream is used in this expansion with respect to the expansion that is configured in this upstream side flank 39L with gas GL, flow with linearity, intermediate ribs 40L is configured in and can covers on the position of expanding with gas GL, this expansion is flowed with linearity with the downstream flank 41L of gas GL with respect to the downstream that is configured in this intermediate ribs 40L.

In the same manner, in a plurality of flanks 38, with near the upstream side flank 39R that is configured in the top 31a of the 28C of folded inside portion, be configured near the intermediate ribs 40R of top 31a of folding part 28B, near and the downstream flank 41R of top 31a that is configured in the 28A of folded portion, also be configured on the identical arrangement position, to extend with radial oblique to the right the place ahead from expansion area 25, in addition, in a plurality of flanks 38, with near the upstream side flank 39M that is configured in the top 31a of the 28C of folded inside portion, be configured near the intermediate ribs 40M of top 31a of folding part 28B, and near the downstream flank 41M of top 31a that is configured in the 28A of folded portion, also be configured on the identical arrangement position, forwards to extend with radial from expansion area 25.

As mentioned above, the air bag 20 of the 2nd embodiment can be made as described, that is, upper wall portions 22A side and lower wall portion 23A side are formed by injection mo(u)lding respectively, with both at flank 38 and comprise fixedly that side edge part 24 utilizes deposited grade to carry out combination at the position of interior outer peripheral edges 21a.And,, then can assemble airbag apparatus S2 if charging blower 15 is inserted in the 24a of installation tube portion of fixing side edge part 24.If installation position 24e, 24e about utilizing not shown anchor clamps with the 24a of installation tube portion are fixed on the seat plate 4 in the seat portion 3 of seat 1, then the airbag apparatus S2 after the assembling can be assembled on the seat 1, then, if will be connected to the regulation lead-in wire and charging blower 15 lines of not shown air bag actuating circuit, simultaneously seat cushion 6 and epidermis 7 are assembled in the upper surface side of seat portion 3, with lead-in wire and not shown air bag actuating circuit line, and seat 1 is assembled on the floor of vehicle, thus, airbag apparatus S2 can be carried on vehicle.

In addition, this air bag 20A except utilize injection mo(u)lding form, with hill holder 17A separated into two parts and have flank 38 these aspect differences, comprise the size that forms material and each position etc., be identically formed with the air bag 20 of the 1st embodiment.

And, with airbag apparatus S2 after vehicle boarded, if the frontal collision of vehicle, make airbag apparatus S2 action, then charging blower 15 expands from gas vent 15c ejection and uses gas G, expanding flows in the expansion area 25 of air bag 20A from each opening 24d of the 24a of installation tube portion with gas G, and air bag 20A separates and the thickening expansion front end 38b of each flank 38 shown in A～C of Figure 14 with lower wall portion 23A.Therefore, in airbag apparatus S2, as shown in figure 16, the lower surface 20f of air bag 20A is supported on the seat plate 4, can be in the mode that roughly correspondingly uprises with gauge T1 (with reference to the C of Figure 14), the anterior 3a that makes seat portion 3 is from seat plate 4 bump height H, even the passenger M that is seated on the seat portion 3 of seat 1 produces the downslide phenomenon, forwards side is slided on seat portion 3, also can be by the anterior 3a side toe lateral back side of bearing huckle T of protuberance, suitably limit slip forwards on the seat portion 3.

And, in the air bag 20A of the 2nd embodiment, even under the state before expansion, from pushing to the direction that thickness is dwindled on every side, also can utilize flank 38, prevent the contact between relative upper wall portions 22A and the lower wall portion 23A, the abnormal sound that produces in the time of can preventing to contact occurs.

In addition, each flank 38 from the outer peripheral edges 21a of the direction of the thickness direction quadrature of air bag 20A, across gap configuration, rather than begin mutually configuration continuously from outer peripheral edges 21a.Therefore, make when expanding, can near the zone till 38, suppress fold and produce, successfully expanding from outer peripheral edges 21a to flank away near expansion area 25 thickenings the air bag 20A central authorities of outer peripheral edges 21a.In addition, if begin to dispose continuously mutually flank from the outer peripheral edges 21a of air bag 20A, when then expanding making air bag 20A plastic deformation, rigidity the zone from outer peripheral edges 21a to flank is too high, be easy to generate fold, if, then in this position, produce stress concentration owing to produce fold, generation causes the hole that leaks gas, so not preferred.

And if flank 38 is set, then can make a side wall portion on the contrary is that upper wall portions 22A and another side wall portion are spacing distance S0 (with reference to Figure 13) the formation large-size to a certain degree between the lower wall portion 23A.Promptly, surround in the outer peripheral edges 26 in three sides of the air bag 20A that links upper wall portions 22A and lower wall portion 23A, compare with the situation that the spacing distance S0 between upper wall portions 22A and the lower wall portion 23A is less, can make curvature become big (making diameter dimension D become big) and binding upper wall portions 22A and lower wall portion 23A.Therefore, when air bag 20A expands, expand with upper wall portions 22A and lower wall portion 23A mode separated from one another, three sides of air bag 20A between upper wall portions 22A and lower wall portion 23A are surrounded the 22a of edge portion in the outer peripheral edges 26,23a, when crossing angle θ 0 (with reference to the C of Figure 14) expansion each other, can be shown in the long and two-short dash line of Figure 13, (to make the 22Aa of edge portion away from top 26c respectively, 23Aa binding site alignment each other) position 21b, 21c is the center, successfully carry out the bending ductility distortion, the 22a of edge portion, 23a can suppress stress concentration and be out of shape, can suppress three sides of air bag 20A and surround outer peripheral edges 26 damages, wherein, top 26c is the profile top that three sides of air bag 20A are surrounded the thickness direction in the outer peripheral edges 26.

Thus, in the air bag 20A of the 2nd embodiment, may be limited to upper wall portions 22A relative on the thickness direction contacts when accommodating each other with lower wall portion 23A, can prevent to produce abnormal sound, in addition, even form the structure of carrying out plastic deformation and expanding, near the fold and three sides in zone that also can suppress between outer peripheral edges 21a and the flank 38 are surrounded the generation that outer peripheral edges 26 (outer peripheral edges 21a) are damaged, and help successfully to expand.

And, in the 2nd embodiment, flank 38 constitutes, when air bag 20A expands, remove the binding between upper wall portions 22A and the lower wall portion 23A, upper wall portions 22A and the spacing distance between the lower wall portion 23A when expanding are increased, air bag 20A is expanded with the mode thickening that becomes gauge T1 from gauge T0.

In addition, in the 2nd embodiment, with expand with gas G from upstream side downstream side flow direction as with the front side of the thickness direction quadrature of air bag 20A, the gas supply sidepiece 27 that making expands flows between upper wall portions 22A and lower wall portion 23A with gas G i.e. fixing side edge part 24, is configured on the trailing edge 20b away from the outer peripheral edges 21a side of central authorities.And, each flank 38 uses the downstream of gas G a plurality of to the upstream side configuration from supply with sidepiece 27 mobile expansions from gas, and, pose as being configured in the arrangement of expanding with the flank 38 in the upstream side of gas G and downstream, set as following mode, that is, upstream side flank 38 is configured in can covers on the position of expanding with gas G, this expansions uses the flank 38 in gas G downstream mobile with linearity with gas G with respect to being configured in to expand.Therefore, because the flank 38 of side (for example downstream, downstream flank 41M or intermediate ribs 40M) expansion of streamlined flow covered by the flank 38 (upstream side flank 39M) of upstream side with gas GM, so influence that the downstream flank 41M in downstream and intermediate ribs 40M are not expanded and flow with gas GM, can easily be set at upstream side flank 39M and compare earlier, remove the binding between upper wall portions 22A and the lower wall portion 23A with the intermediate ribs 40M and the downstream flank 41M in downstream.In other words, in the air bag 20A of said structure, can be easily will be set near the upstream side flank 39L, 39M, 39R of upstream side at the position of the expansion area 25 that expands of thickening at first at the expansion initial stage.

And, under the situation of present embodiment, the upstream side that to use gas G from expanding to a plurality of flanks 38 of downstream configuration dispose multiple rows (in the present embodiment, three row for additional subscript L, M, R), the upstream side flank 39L, 39M, the 39R that are configured in expansion usefulness gas G upstream side respectively with each row, being configured to encompasses inflation is the thickest expansion area 25, and each intermediate ribs 40L, 40M, 40R and downstream flank 41L, 41M, 41R that is listed as the downstream is configured in from the position of expansion area 25 with radial expansion.Therefore, in above-mentioned air bag 20A, the position that is expanded to the thickest expansion area 25 can be configured near the central authorities of the air bag 20A that a plurality of flanks 38 by radial configuration surround, the position that makes this expansion area 25 successfully begins to expand from the expansion initial stage, and suppress fold and produce, can successfully expand the most thickly.And, in the 2nd embodiment, be set in the expansion area 25, expand at the initial stage of expansion thickening near the upstream side flank 39M, so that at the expansion initial stage, also can suitably bear near the anterior rear side of huckle T of passenger M.

Certainly, in the 2nd embodiment, with the 1st embodiment in the same manner, to supply with the outer peripheral edges 21a of sidepiece 27 away from gas constitutes by (edge portion relatively) 26a, the 26a of two edge portions of the Width of air bag 20A with away from the front-end edge 26b that gas is supplied with sidepiece 27, and, constitute the consecutive curvilinear three sides encirclement outer peripheral edges 26 that formation is expanded laterally.And, to the folding part 28,33 of the thickness direction of air bag 20A depression, between upper wall portions 22A and lower wall portion 23A, form the curve-like that surrounds outer peripheral edges 26 along three sides, and, dispose a plurality of to the inside with one heart.And, each folding part 28,33 form the bottom 29 with depression along the section shape of the thickness direction of air bag 20A separately, 34 and two rakes 30,31,35,36 V word shape, wherein, two rakes 30,31,35,36 from the bottom 29,34 to extend to the mode of both sides expansion, when expansion flows into gas, carry out moulding distortion on one side and make A/F size WU1, WU2, WU3, WD1, WD2, WD3 (with reference to Figure 13) expands into A/F size WU10, WU20, WU30, WD10, WD20, WD30 (with reference to the C of Figure 14) is Yi Bian expand air bag 20A.Therefore, in the air bag 20A of the 2nd embodiment, flow into gas G if make to expand, then upper wall portions 22A separates flank 38 on one side with lower wall portion 23A, in separated from one another mode expand on one side, make gauge T0 become gauge T1.At this moment, upper wall portions 22A in the three sides encirclement outer peripheral edges 26 and the 22a of edge portion between the lower wall portion 23A, 23a, crossing angle θ 0 is each other enlarged, make each folding part 28 on one side, in 33 across bottom 29, two rakes 30 of 34,31,35,36 crossing angle each other enlarges, perhaps, make rake 30,31,35,36 top 30a, 31a, 35a, the 36a side enlarge with crossing angle on every side, in other words, by each folding part 28,33 so that the mode that the A/F size enlarges is carried out plastic deformation, thereby can increase gauge and expand.Promptly, in the air bag 20A of the 2nd embodiment, air bag 20A thickening is expanded, so that the increase and decrease of depth dimensions dU2, the dU1 of folding part 28,33, dU0, dD2, dD 1, dD0 and A/F size WU1, WU2, WU3, WD 1, WD2, WD3 is directly proportional.

And, in the air bag 20A of the 2nd embodiment, when expanding, because three sides are surrounded outer peripheral edges 26 and are formed the consecutive curve-like that expands laterally, do not have straight line portion,, be difficult to produce local center side and cave in and the fold of generation to air bag 20A so surround in the outer peripheral edges 26 in three sides.In addition, a plurality of folding parts 28,33 of expansion area 25 also form the curve-like that surrounds outer peripheral edges 26 along three sides, configuration with one heart to the inside, be expanded to the thickest position, promptly near top 31a, the 36a of the inboard rake 31,36 among the most inboard folding part 28C, the 33C, make top 30a, 31a, 35a, 36a can uprise the ground displacement in turn, and can not produce fold from three sides encirclement outer peripheral edges, 26 sides to inboard rake 30,31,35,36.Therefore, in above-mentioned air bag 20A, when expansion is finished, can suppress three sides and surround in outer peripheral edges 26 and the inboard expansion area 25 that is provided with folding part 28,33 and produce fold, successfully expand and make to expand and finish.

And in the air bag 20A of the 2nd embodiment, flank 38 makes a side end, is connected for the top 31a in the folding part 28 of base end 38a and upper wall portions 22A is neighbouring in the present embodiment.Therefore, in this air bag 20A, near the configuration flank 38 top 31a of the rake that protrudes from the outside face side most 31 of folding part 28, thereby directly support near the top 31a that pushes easily by flank 38, be difficult to depression, can prevent near the local dent 31a of top reliably and produce abnormal sound when shriveling.

In addition, in the air bag 20A of the 2nd embodiment, the section shape along the thickness direction of air bag 20 in each folding part 28,33 also forms, the bottom 29,34 that makes folding part 28,33 respectively is from the central authorities of 28,33 the Width along the folding part, to the inboard skew of surrounding outer peripheral edges 26 away from three sides, for from bottom 29,34 to two rakes 30,31,35,36 that extend both sides, 29,34 tilt angle theta f, the θ b that rise from the bottom, surround the rake 30,35 of outer peripheral edges 26 sides with three sides and compare, inboard rake 31,36 is bigger.Utilize said structure, the rake 30,31,35,36 of the both sides that form across bottom 29,34 in folding part 28,33 is expanding when flowing into gas G, bears respectively and the pressure GF of the outside expansion of the direction of the inner peripheral surface side quadrature of air bag 20 with gas G.The pressure GF of this moment is divided into: " outwards component " VF, it outwards acts on along thickness direction; And " along surperficial component " LFF, LFB that cancels each other out, they are 28,33 Width along the folding part, that is, along with the upper wall portions 22A of the air bag 20A of the thickness direction quadrature of air bag 20A and the surface (upper surface 20e and lower surface 20f) (with reference to Figure 13) of lower wall portion 23A.And, three less sides of tilt angle theta f are surrounded the rake 30,35 of outer peripheral edges 26 sides, compare with the rake 31,36 of inboard, corresponding to the pressure that expands with gas G, to bear outside component (VF=GF * cos θ f＞GF * cos θ b (this is owing to the θ f＜θ b less than 90 °)) with the corresponding larger proportion of less tilt angle theta f.And, because bottom 29,34 is compared with the rake 31,36 of inboard so this three side is surrounded the rake 30,35 of outer peripheral edges 26 sides, along the area of conter (SHAf＞SHAb) bigger of thickness direction to the inboard skew of surrounding outer peripheral edges 26 away from three sides.In addition, the rake 30,35 that three sides are surrounded outer peripheral edges 26 sides is configured in the outer edge side that surrounds outer peripheral edges 26 sides as three sides, compare with the rake 31,36 of inboard, surround the area itself of outer peripheral edges 26 sides also big (with reference to the zone of the rake 30 of the SAf shown in the oblique line of Figure 10＞) with the zone of the rake 31 of the SAb shown in the point-like of Figure 10 along three sides.Its result in the air bag 20A of said structure, can promptly make folding part 28,33 move to the direction that expands, and can promptly expand.

And, in the 2nd embodiment, section shape for folding part 28,33, also form, bottom 29,34 is from the inboard skew of the mediad of 28,33 the Width along the folding part, and each folding part 28,33 is along with surrounding outer peripheral edges 26 from the inboard near three sides, and the cup depth size dU2 of bottom 29,34, dU1, dU0, dD2, dD1, dD0 deepen (dU2＜dU1＜dU0, dD2＜dD1＜dD0).

Utilize said structure, the position that increases thickness at first stably can be set near top 31Ca, the 36Ca of inboard rake 31C, 36C in the most inboard folding part 28,33.Promptly, when expanding with gas G inflow, upper wall portions 22A and lower wall portion 23A that three sides of air bag 20A are surrounded in the outer peripheral edges 26 enlarge crossing angle θ 0 each other on one side, make each folding part 28 on one side, in 33 across bottom 29, two rakes 30 of 34,31 and two rakes 35,36 each other crossing angles enlarge, perhaps, make rake 30,31,35,36 top 30a, 31a, 35a, the 36a side enlarge with crossing angle on every side, make gauge T0 increase to gauge T1, the most inboard folding part 28C, the inboard rake 31C of 33C, the top 31Ca of 36C, near the 36Ca, because the total of the crossing angle of above-mentioned expansion and thickness increases.Therefore, at the expansion initial stage of air bag 20A, shown in the B of Figure 14, the effect of the displacement of intersecting angle by adding up, can make near top 31Ca, the 36Ca of inboard rake 31C, 36C of the most inboard folding part 28C, 33C, reliably and stably upper wall portions 22A and the lower wall portion 23A from air bag 20A protrudes, and thickness is increased.

In addition, in the 2nd embodiment, make the top 31Ca of rake 31C be in from expansion initial stage of air bag 20A just can be suitably the fixing mode on the allocation position of the anterior rear side of the huckle T of passenger M, it is configured in the anterior 3a side of seat portion 3.

And, in the 1st, the 2nd embodiment, carry the employed air bag 20 of airbag apparatus S1, S2,20A on the seat portion 3 of seat 1 as anti-fall usefulness, illustration near the top 31Ca, the 36Ca that overlook under the observation to rake 31C, the 36C of folding part 28C, the 33C of semicircle arcuation, expand the highest air bag, but also can form the structure of the air bag 20B of employed the 3rd embodiment of airbag apparatus S3 shown in Figure 17～19.

This airbag apparatus S3 carries on the car door VD of vehicle, when the side collision of vehicle, charging blower 15 expands from gas vent 15c ejection and uses gas G, air bag 20B finishes expansion in the mode that automobile door garnish DT is stretched out to the car inboard, bears the passenger of side shifting outside car across automobile door garnish DT.

And, in this air bag 20B, form the semi-circular plate shape with the air bag 20 of the 1st embodiment roughly the samely, form by identical materials, have: fixedly side edge part 24, and it is provided with hill holder 17 and charging blower 15; And expansion area 25, it surrounds outer peripheral edges 26 by three sides and surrounds.And, one side wall portion 22B of automobile door garnish DT side has two folding parts 28 (28A, 28B), it surrounds outer peripheral edges 26 along three sides is curve-like, and concentric arrangement, be supported on another side wall portion 23B that base portion DTB side is installed and constitute, dispose folding part 33D, 33E near fixing side edge part 24 sides.These folding parts 33D, 33E are configured to be used to make fixedly also thickening expansion of side edge part 24 sides, and the whole zone that makes air bag 20B is with roughly the same thickness swelling.And, it is circular-arc that three sides encirclement outer peripheral edges 26 dwindle into terminal 26ab in the narrower mode of the width dimensions of the left and right directions of air bag 20B, and be connected with the higher fixedly side edge part 24 of the rigidity that supports by hill holder 17, so that expand when finishing, do not produce fold near near the terminal 26ab of the three sides encirclement outer peripheral edges 26 fixing side edge part 24 at air bag 20B.And folding part 33D, 33E are configured to, and along the fixedly side edge part 24 of above-mentioned end 26ab and linearity, and form as far as possible with one heart in the inboard (similar shape).

In this air bag 20B, if flow into gas G from the expansion of charging blower 15, then each folding part 28,33 moulding distortion and A/F size is separately enlarged are expanded, another side wall portion 23B is separated on one side with a side wall portion 22B, Yi Bian gauge is increased.And, in this air bag 20B,, the configuring area of folding part 28,33 is offset significantly, so that under the observation of side, the configuring area of folding part 28,33 is not overlapping on the thickness direction of air bag 20B in top 20h side and bottom 20i side.Therefore, air bag 20B can make expansion area 25 on bigger area, expands with homogeneous thickness.Its result, air bag 20B can make automobile door garnish DT to inboard parallel the moving of car from the installation base portion DTB side of airbag apparatus S3 is installed, and, when bearing the passenger, also can make automobile door garnish DT can not bear the passenger obliquely up and down and all around.

In addition, the parts of the label CM of Figure 19 are the strut members that extend from installation base portion DTB in order to keep automobile door garnish DT, and it can carry out elastic deformation and extend.

In addition, also can in this air bag 20B, flank 38 be set.That is, also can form the structure of the air bag 20C of employed the 4th embodiment of airbag apparatus S4 shown in Figure 20～22.This air bag 20C except form by injection mo(u)lding, with hill holder 17A separated into two parts and have flank 38 these aspect differences, comprise the size that forms material and each position etc., be identically formed with the air bag 20B of the 3rd embodiment.

And, the base end 38a of flank 38 is configured on the bottom 29,34 of each folding part 28,33 of inner peripheral surface side of air bag 20C, with front end 38b and relative another side wall portion 23C or side wall portion 22C joint, contact with another side wall portion 23C can prevent a side wall portion 22C.

In this air bag 20C, if the expansion from charging blower 15 flows into gas G, then the front end 38b of each flank 38 is separated on one side with another a side wall portion 23C or a side wall portion 22C, each folding part 28,33 is carried out moulding distortion and A/F size is separately enlarged on one side, thereby expand, make another side wall portion 23C separate, increase gauge simultaneously with another side wall portion 22C.And, in this air bag 20C, because in top 20h side and bottom 20i side, make folding part 28,33 configuring area is offset significantly, so that under the observation of side, folding part 28,33 configuring area is not overlapping on the thickness direction of air bag 20c, so the expansion area 25 of air bag 20C is expanded with homogeneous thickness in bigger area, can be from installation base portion 53 sides of airbag apparatus S4 be installed, automobile door garnish 52 is inboard parallel mobile to car, and, can when bear the passenger, not make automobile door garnish 52 inclinations and bear the passenger with all around going up up and down.

In addition, in air bag 20A, the 20C of the 2nd, 4 embodiments, utilize injection mo(u)lding and form.But, in the resin air bag, only contacting with each other and be provided with under the situation of flank at a side wall portion relative on the thickness direction and another side wall portion in order to prevent, shown in the air bag 20D of the airbag apparatus S5 of the 1st variation that also can be shown in Figure 23～25, utilize the blow molding of using synthetic resin such as polyamide and form.This air bag 20D forms the 24a of installation tube portion in the fixing side edge part 24 by injection mo(u)lding in advance, so that the assembling of charging blower 15 becomes easily, and forms the position of the air bag 20D except the 24a of installation tube portion by blow molding.And, if in the fixedly side edge part 24 after the 24a of installation tube portion (hill holder 17) the insertion blow molding, and charging blower 15 is inserted among the mounting hole 24b of the installation tube 24a of portion, with the periphery of installation position 24e, the 24e at two ends, the left and right sides by not shown anchor clamps clamping, and these anchor clamps are fixed on the upper surface 4a side of seat plate 4, then air bag 20D can be fixed on the seat plate 4 with charging blower 15, thereby air bag S5 can be carried on seat portion 3.

In addition, also the 24a of installation tube portion of this monomer can be applied to the fixedly side edge part 24 of the air bag 20A of the 2nd embodiment.At this moment, the flank 38 that links upper wall portions 22A and lower wall portion 23A also can be set near the 24a of installation tube portion.

And, in this air bag 20D, at a side wall portion is the folding part 56,57 that approximating section U word shape is set on upper wall portions 22D and the lower wall portion 23D, front end 56a, the 57a of folding part 56,57 is strippingly deposited mutually, on folding part 56,57, form flank 38B, upper wall portions 22D in its restriction position except folding part 56,57 and the contact between the lower wall portion 23D.

Therefore, in this air bag 20D,, also can utilize a plurality of flank 38B on every side, prevent relative upper wall portions 22D in the position except folding part 56,57 and the contact between the lower wall portion 23D even from pushing to the direction that thickness is dwindled.

In addition, each flank 38B is outer peripheral edges 21a from the edge portion with the direction of the thickness direction quadrature of air bag 20D, across gap configuration, rather than begins mutually configuration continuously from outer peripheral edges 21a.Therefore, when thickening expands near making away from the central authorities of the air bag 20D of outer peripheral edges 21a, can near the zone till from outer peripheral edges 21a to flank 38B, suppress the fold generation, successfully expand.

And, if be provided with flank 38B, spacing distance S0 between upper wall portions 22D and the lower wall portion 23D is increased, in the outer peripheral edges 21a of the air bag 20D that links upper wall portions 22D and lower wall portion 23D, compare with the situation that the spacing distance S0 between upper wall portions 22D and the lower wall portion 23D is less, curvature change big (making diameter dimension D become big, identical) be can make and upper wall portions 22D and lower wall portion 23D linked with the semicircle arcuation with the gauge T0 of air bag 20D.Therefore, when air bag 20D expands, expand with upper wall portions 22D and lower wall portion 23D mode separated from one another, the 22a of edge portion among the outer peripheral edges 21a of air bag 20D between upper wall portions 22D and lower wall portion 23D, 23a, when mutual crossing angle θ 0 (with reference to the long and two-short dash line of Figure 24) enlarges, can be with respectively away from the position 21b of top 21aa, 21c is the center, successfully carry out the bending ductility distortion, can suppress stress concentration and be out of shape, the outer peripheral edges 21a that can suppress air bag 20D damages, wherein, top 21aa is the profile top of the thickness direction among the outer peripheral edges 21a of air bag 20D.

Thus, in the air bag 20D of the 1st variation, when accommodating, also may be limited between upper wall portions 22D relative on the thickness direction and the lower wall portion 23D except folding part 56, position beyond 57 contacts with each other, can prevent to produce abnormal sound, in addition, even form the structure of carrying out plastic deformation and expanding, can suppress the generation that near the zone between outer peripheral edges 21a and the flank 38 fold and outer peripheral edges 21a damage as far as possible, can successfully expand, and, can be with flank 38B fracture and make the spacing distance between upper wall portions 22D and the lower wall portion 23D become big mode, form bigger gauge T1 and finish expansion.

And, in the 1st variation,, the opening of face side is enlarged because folding part 56,57 can local bending plastic deformation, thus with the 1st, 2 embodiments similarly, can further increase gauge and finish expansion.

In addition, variation as the air bag 20A of the 2nd embodiment, also can folding part 28 be set, form air bag 20A by blow molding in the time of 33, in this case, also can be and deposited with lower wall portion 23A with the bottom 29 parts depression of folding part 28, perhaps with the bottom 34 parts depression of folding part 33 and deposited with upper wall portions 22A, perhaps caved in approximating mode in the bottom 34 of the bottom 29 of folding part 28 and position between the lower wall portion 23A or folding part 33 and the position between the upper wall portions 22A and deposited, can be thereby form from the flank 38 of deposited fracture.

In addition, be provided with under the situation of flank, also can the folding part be set and form air bag, also can form the structure of air bag 20E of the airbag apparatus S6 of the 2nd variation shown in Figure 26～29.The air bag 20C of this air bag 20E and the 4th embodiment in the same manner, can be used to carry the airbag apparatus S6 on car door 51, utilization is carried out injection mo(u)lding by synthetic resin such as polyamide, thereby will be each other a relative side wall portion 22E side and the moulding of another side wall portion 23E side on thickness direction, utilize deposited each other or bonding is carried out combination and formed.The tabular flank 38C that contact between one side wall portion 22E and another side wall portion 23E is limited, base end 38a side is combined with a side wall portion 22E, with the weak binding force of comparing with the side wall portion 22E of outer peripheral edges 21a and the 22a of edge portion between another side wall portion 23E, 23a binding force each other, utilize deposited or bonding and front end 38b is combined with another side wall portion 23E.

In this air bag 20E, can utilize a plurality of flank 38C and prevent contact between a side wall portion 22E and another side wall portion 23E, and, because each flank 38C is from the outer peripheral edges 21a of air bag 20E, across gap configuration, be not to begin mutually configuration continuously, so near the zone till from outer peripheral edges 21a to flank 38C from outer peripheral edges 21a, can suppress fold and produce, successfully expand.

And, owing to utilize flank 38C, the 22a of edge portion, 23a among the outer peripheral edges 21a of air bag 20E can be made each other curvature become big (makes diameter dimension D become big, identical with the gauge T0 of air bag 20E) and link with the semicircle arcuation, so when air bag 20E expands, can suppress the stress concentration among the outer peripheral edges 21a as far as possible and be out of shape, can suppress outer peripheral edges 21a and damage.

In addition, in this air bag 20E, also can be when expanding, so that the front end 38b of flank 38C separates with another side wall portion 23E, the mode that the spacing distance between a side wall portion 22E and another side wall portion 23E is increased increases gauge and finishes expansion.In addition, in this air bag 20E, when expanding, owing to do not have the folding part, so compare with the air bag 20C of the 4th embodiment, the gauge that expands is suppressed, but a side wall portion 22E and another side wall portion 23E self expand air bag 20E so that the long mode of extending of its film is carried out plastic deformation.

In addition, in air bag 20A, the 20C of the 2nd, 4 embodiments, flat flank 38,38C so that the mode of from lower wall portion 23A etc., peeling off away from the front end 38b of base end 38a separate, but also can between front end 38b that combines with lower wall portion 23A etc. and base end 38a, the fracture reservations be set, this fracture reservations department is made of the otch that makes flank fracture at tensile force as the time spent etc., when airbag inflation, make the fracture reservations fracture of flank, spacing distance between one side wall portion and another side wall portion is enlarged, expand thereby make air bag become big.

Certainly, be provided with under the situation of flank, shown in also can the employed air bag 20F of airbag apparatus S7 of the 3rd variation as shown in Figure 30, formation as follows, that is, protrude and the butt combination from a relative side wall portion 22F and another side wall portion 23F by making flank form position 59, thereby form flank 38D, when air bag 20F expands, make flank 38D fracture at this bearing surface 38c place.In addition, this air bag 20F also uses the synthetic resin such as polyamide identical with the air bag 20A of the 2nd embodiment, utilizes injection mo(u)lding and forms.

And, be provided with under the situation of flank, shown in the employed air bag 20G of airbag apparatus S8 of the 4th variation that also can be shown in Figure 31,32, the flank 38E that links a side wall portion 22G and another side wall portion 23G is formed, even when air bag 20G expansion is finished, also can keep the connecting state between a side wall portion 22G and another side wall portion 23G.This air bag 20G also uses the synthetic resin such as polyamide identical with the air bag 20A of the 2nd embodiment, utilizes injection mo(u)lding and forms.

And, in this air bag 20G, can utilize a plurality of flank 38E and prevent contact between a side wall portion 22G and another side wall portion 23G, and, because each flank 38E is from the outer peripheral edges 21a of air bag 20G, across gap configuration, rather than begin mutually configuration continuously from outer peripheral edges 21a, so, near the zone till from outer peripheral edges 21a to flank 38E, can suppress fold as far as possible and produce, successfully expand.

And, utilize flank 38C, the 22a of edge portion, the 23a among the outer peripheral edges 21a of air bag 20G can be made each other curvature become big (making diameter dimension D become big, identical) and link with the semicircle arcuation with the gauge T0 of air bag 20G.Therefore, when air bag 20G expands, expand with a side wall portion 22G and another side wall portion 23D mode separated from one another, the 22a of edge portion among the outer peripheral edges 21a of air bag 20G between a side wall portion 22G and another side wall portion 23G, 23a, when crossing angle θ 0 (with reference to the long and two-short dash line of Figure 31) expansion each other, can be (to make the 22a of edge portion away from top 21aa respectively, 23a binding site correspondence each other) position 21b, 21c is the center, carry out the bending ductility distortion, can suppress stress concentration as far as possible and be out of shape, the outer peripheral edges 21a that can suppress air bag 20G damages, wherein, top 21aa is the profile top of the thickness direction among the outer peripheral edges 21a of air bag 20G.

In addition, in the 4th variation, because when air bag 20G expanded, flank 38E kept the connecting state between a side wall portion 22G and another side wall portion 23G, so with make flank fracture or with wall part from situation compare, the gauge after being difficult to guarantee to expand is bigger.But, in the 4th variation, by flank 38E is set, the gauge T0 of air bag 20G before expanding itself is increased, if the height dimension HL of flank 38E is increased, even the expansion ratio itself before and after then expanding is identical, gauge (volume height) T1 of the air bag 20G self under the swelling state that expands after finishing is increased.

In addition, be provided with under the situation of flank, shown in the air bag 20H of the 5th variation that also can be shown in Figure 33～Figure 36, under the situation of the airbag apparatus S9 that is used for anti-fall usefulness, in the upper wall portions 22H and lower wall portion 23H of the perisporium 21 that constitutes air bag 20H, be seat plate 4 with the lower wall portion 23H double as that is configured in the below.

Promptly, this air bag 20H constitutes, mode with the anterior 3a side protuberance that when expanding, makes vehicle seat used 1 seat portion 3, be configured in the lower face side of the seat cushion 6 of seat portion 3, make lower wall portion 23H compare and have rigidity with upper wall portions 22H, on the contrary, upper wall portions 22H compares with lower wall portion 23H, is easy to expand in plastic deformation.Under the situation of the 5th variation, upper wall portions 22H and lower wall portion 23H are formed by synthetic resin such as being easy to deposited each other bonded assembly polyamide or polypropylene, and lower wall portion 23H compares with upper wall portions 22H and forms heavy wall, guarantees rigidity.

And the lower wall portion 23H of the 5th variation is configured in the below in the roughly whole zone of seat cushion 6, forms roughly rectangular slab shape shape, across the upper wall portions 22H with flank 38H and can be from supported underneath seat cushion 6.In addition, lower wall portion 23H with outer peripheral edges 23b at least about the left border portion 231 and the 23r of right border portion of two edge portions, install be configured in seat portion 3 about on the seat portion support 1a of seat 1 on two edge, 1a keeps by the seat portion support.In addition, under the situation of present embodiment, lower wall portion 23H also can install the leading edge 23f of outer peripheral edges 23b and remain on the seat portion support 1a.

In addition, specific rigidity is lower mutually with lower wall portion 23H for upper wall portions 22H, but utilizes flank 38H and the zone (zone of protuberance 22c described later) that suppresses to expand upward subsides downwards.Thus, this lower wall portion 23H comprises the whole zone of the zone of protuberance 22c at interior seat cushion 6 from supported underneath.

Upper wall portions 22H forms thin-walled, compares easy plastic deformation with lower wall portion 23H, expanding away from lower wall portion 23H when expansion flows into gas G.And, constitute have a plurality of substantial middle with the left and right directions that surrounds anterior 3a under near, promptly be expanded to the folding part 28 that the mode of the thickest expansion area 25 caves in downwards, can when air bag 20H expands, the anterior 3a of seat portion 3 successfully being swelled upward.Under the situation of present embodiment, to observe from the top, folding part 28 forms the U word shape that forwards protrudes, and roughly is provided with two with one heart.In addition, upper wall portions 22H is in making the zone that flows into gas G of expanding, protuberance 22c with roughly semi-circular plate shape of protruding upward from lower wall portion 23H, the plan view shape of the air bag 20A of itself and the 2nd embodiment forms roughly the same shape, is provided with two folding parts 28 and expansion area 25 in the zone of this protuberance 22c.In addition, in lower wall portion 23H side, dispose the recess 23c of depression downwards accordingly with protuberance 22c.Therefore, in this air bag 20H, make and expand, thereby expand with in the inflow space 20s between gas G inflow raised part 22c and the recess 23c.

And, in two folding part 28A, 28B, will be flank 38H, and its bottom 29 will be deposited on the lower wall portion 23H in the mode that can separate with lower wall portion 23H when expanding, thereby link with lower wall portion 23H near the folding part 28B double as of expansion area 25 sides.

In addition, in this air bag 20H,, carry out combination to apply to wait by hot melt each other, form outer peripheral edges 21a than large tracts of land with outer peripheral edges 22b, the 23b around protuberance 22c among upper wall portions 22H and the lower wall portion 23H and the recess 23c.And, in this air bag 20H,, be deposited over mode on the lower wall portion 23H with heat at the rear of expansion area 25, under the state of the built-in installation tube 24a of portion with upper wall portions 22H and lower wall portion 23H combination.In addition, after the state with the built-in installation tube 24a of portion forms air bag 20H, charging blower 15 is inserted in the installation tube 24a of portion.

When this airbag apparatus S9 moves, shown in the long and two-short dash line of Figure 34, if expanding from gas vent 15c ejection, charging blower 15 uses gas G, expand and flow in the inflow space 20s via opening 24d with gas G, then separate with lower wall portion 23H the bottom 29 of folding part 28B, bottom 29 grades of folding part 28 are carried out plastic deformation, make folding part 28A, the A/F size WUF of 28B enlarges (with reference to Figure 35), the upper wall portions 22H of expansion area 25 expands upward in the mode away from lower wall portion 23H, with seat cushion 6 jack-up, make front portion 3 protuberance of seat portion 3, wherein, this lower wall portion 23H has rigidity and suppresses subsiding downwards.

And, in the air bag 20H of the 5th variation, also begin flank 38H is arranged across gap configuration from outer peripheral edges (22b, 23b) 21a.Therefore, in this air bag 20H, also may be limited to upper wall portions 22H relative on the thickness direction and lower wall portion 23H contacting when accommodating each other, can prevent to produce abnormal sound, in addition, even form the structure of carrying out plastic deformation and expanding, also can be suppressed at the generation that near the zone between outer peripheral edges 21a and the flank 38H fold and outer peripheral edges are damaged, can successfully expand, and, flank 38H is separated with lower wall portion 23H, finish expansion (with reference to A, the B of Figure 36) so that gauge T0 becomes the mode of bigger gauge T1.

And, in this air bag 20H, lower wall portion 23H is as the structure on the seat portion support 1a that remains on seat 1, double as is for supporting the seat plate 4 of seat cushion 6, even do not use seat plate 4 in addition, also can form the seat 1 of the airbag apparatus S9 that carries anti-fall usefulness, can reduce component parts quantity and assembling man-hour of seat 1.

In addition, when air bag 20H expands, have on the lower wall portion 23H of rigidity, only expand in upper wall portions 22H side direction top, makes the anterior 3a side protuberance of seat portion 3.But, because upper wall portions 22H constitutes, form in order to be easy to plastic deformation with lower wall portion 23H mutually specific rigidity reduce and tensile thin-walled, and, the folding part 28A, the 28B that a plurality of A/F size WUF can expansion are set and expand upward, and, have that the double as away from lower wall portion 23H is the folding part 28B of flank 38H when expanding, so that being increased, gauge T1 expands, so can make the anterior 3a side protuberance of seat portion 3 fully.Its result, if air bag 20H finishes expansion, then be seated at the passenger M on the seat portion 3 of seat 1, the side slip forwards on seat portion 3 even produce the downslide phenomenon, the toe lateral back side that also can utilize the anterior 3a side of protuberance to bear huckle T is suitably limited on seat portion 3 and is forwards slided.

In addition, in the 5th variation, for upper wall portions 22H and lower wall portion 23H, show good each other deposited property of consideration and cohesiveness and all use same material, lower wall portion 23H is compared with upper wall portions 22H form heavy wall, guarantee the situation of the rigidity of lower wall portion 23H, but in addition, as long as compare with the synthetic resin material of upper wall portions 22H, the charging quantity of the reinforcement materials such as extending agent of lower wall portion 23H is more, and can guarantee that upper wall portions 22H and lower wall portion 23H good each other deposited property and cohesiveness get final product, also can with lower wall portion 23H self by with upper wall portions 22H form material differently, can guarantee that the synthetic resin material of rigidity forms.

In addition, in the 5th variation, illustrate in order to make upper wall portions 22H be easy to plastic deformation and upper wall portions 22H to be formed than lower wall portion 23H thin-wall situation, but in addition, as long as compare with the synthetic resin material of lower wall portion 23H, the charging quantity of the extending agent of upper wall portions 22H etc. is less and rigidity is reduced, and can guarantee that upper wall portions 22H and lower wall portion 23H good each other deposited property and cohesiveness get final product, also can with upper wall portions 22H self by with lower wall portion 23H form material differently, can guarantee that the synthetic resin material that extends forms.

And in the air bag 20H of the 5th variation, the folding part 28A in the outside is not with bottom 29 and lower wall portion 23H butt, and certainly, this folding part 28A also can form flank 38H with lower wall portion 23H butt, and links with lower wall portion 23H separably.In addition, folding part 28 also can be provided with more than or equal to 3, is flank 38H with one or more or whole double as suitably.

Claims (8)

1. resin air bag, it constitutes perisporium by laminar synthetic resin, and by expanding with the inflow of gas so that each other on thickness direction relative side wall portion and opposite side wall part from mode expand,

This resin air bag is characterised in that,

With so that the outer peripheral edges in the zone that a described side wall portion and described another side wall portion mode separated from one another expand, surround outer peripheral edges and constitute as three sides, it has: two relative edge, they on Width toward each other; And the binding edge, it links two described relative edge,

Described three sides are surrounded outer peripheral edges as the section along thickness direction, a described side wall portion are connected with the semicircle arcuation with described another side wall portion, and, overlook the consecutive curve-like that formation is expanded laterally under the observation,

Surround in the outer peripheral edges institute area surrounded by described three sides, on at least one of a described side wall portion and described another side wall portion, dispose a plurality of folding parts to the inside with one heart, it forms along described three sides and surrounds outer peripheral edges and surround the curve-like that the outer peripheral edges side expands to described three sides, thickness direction depression to described air bag, and

Described each folding part is separately along the section shape of described balloon thickness direction, form the bottom with depression and the V word shape of two rakes, these two rakes extend to both sides from this bottom, described each folding part constitutes, when expansion flows into gas, carry out plastic deformation on one side so that the A/F size enlarges, Yi Bian make described airbag inflation

The gauge that the position of described folding part is set is set at, and expansion is flowed into gas, guarantees the specific thickness size and finishes when expanding, and suppresses in the scope of the outside face side upset in described folding part.

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

The section shape along the thickness direction of described air bag of described each folding part forms respectively,

The bottom that makes described folding part is from surrounding the inboard skew of outer peripheral edges along the mediad of the Width of described folding part away from described three sides,

For the angle of inclination from described bottom surface sections rising of two rakes that extend to both sides from described bottom, surround the described rake of outer peripheral edges side with described three sides and compare, inboard described rake is bigger.

3. resin air bag according to claim 2 is characterized in that,

A plurality of described folding parts form, and along with surrounding outer peripheral edges from inboard near described three sides, the cup depth of described bottom deepens.

4. resin air bag according to claim 1 is characterized in that,

Described folding part is configured in a described side wall portion and described another side wall portion on the two, and the bottom of the depression of described folding part, between a described side wall portion and described another side wall portion, with the direction of thickness direction quadrature on the configuration of staggering.

5. resin air bag according to claim 1 is characterized in that,

From the edge with the direction of the thickness direction quadrature of described air bag is outer peripheral edges, across the gap configuration flank, its link a described side wall portion and described another side wall portion and limit a described side wall portion and described another side wall portion closer to each other, and,

Described flank is configured to, and when described airbag inflation, removes the binding between a described side wall portion and described another side wall portion.

6. resin air bag according to claim 5 is characterized in that,

With expand with gas from upstream side downstream side flow direction as with the direction of the thickness direction quadrature of described air bag, make the gas supply sidepiece that expands and between a described side wall portion and described another side wall portion, flow with gas, be configured in the relative edge outer peripheral edges side each other of surrounding outer peripheral edges away from described three sides of described binding edge

Described flank is a plurality of to the upstream side configuration with the downstream of gas from supply with the mobile expansion of sidepiece from described gas, and,

Expand with the upstream side of gas and the ordered state of the described flank between the downstream as being configured in, the flank that is set at upstream side is configured in to cover and expands with on the position of gas, and this expansion is flowed with linearity with respect to being configured in the flank of expansion with the downstream of gas with gas.

7. resin air bag according to claim 5 is characterized in that,

Be configured in from the expansion a plurality of described flank configuration multiple row of the upstream side of gas to the downstream,

The described flank that expands with the upstream side of gas that is configured in separately of each row is configured to, and encompasses inflation is the thickest expansion area,

The described flank in the downstream of each row is configured in from the position of described expansion area with radial expansion.

8. resin air bag according to claim 5 is characterized in that,

Described flank disposes a plurality of, and a side end that will extend along the thickness direction of described air bag and is connected near the top of rake in the described folding part of a described side wall portion or described another side wall portion.

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