CN101396996A - Airbag for knee protection - Google Patents

Airbag for knee protection Download PDF

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Publication number
CN101396996A
CN101396996A CNA2008101488356A CN200810148835A CN101396996A CN 101396996 A CN101396996 A CN 101396996A CN A2008101488356 A CNA2008101488356 A CN A2008101488356A CN 200810148835 A CN200810148835 A CN 200810148835A CN 101396996 A CN101396996 A CN 101396996A
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CN
China
Prior art keywords
aforementioned
knee
air bag
frenulum
wall portion
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Pending
Application number
CNA2008101488356A
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Chinese (zh)
Inventor
今枝宽树
榊田克己
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Toyoda Gosei Co Ltd
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Toyoda Gosei Co Ltd
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Publication date
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Publication of CN101396996A publication Critical patent/CN101396996A/en
Pending legal-status Critical Current

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Abstract

An airbag (40) for knee protection internally includes a first tether (51) that connects a knee-side wall (41) and a vehicle body side wall (42) by a connecting distance (TL1) of 50 to 90 mm and partitions the airbag (40) into an upper inflatable chamber (44) and a lower inflatable chamber (49). The mainstreams of inflation gas heading to the upper inflatable chamber (44) from the lower (49) are located proximate left and right ends of the airbag (40). The upper inflatable chamber (44) has an outer diameter (D1) of 150 to 220 mm at full airbag inflation. The lower inflatable chamber (49) includes on the vehicle body side wall (42) a mounting portion (43) by which the airbag (40) is secured to the case and is designed such that a top (49b) of its rear face (49a) is dislocated forward relative to that of the upper inflatable chamber (44) by 10 to 70 mm at full inflation of the airbag.

Description

Knee protection air bag
Technical field
The present invention relates to a kind of knee protection air bag, it is applicable to the airbag apparatus that protection is taken one's seat when vehicle collision chaufeur or front passenger's seat are taken passengers' such as personnel knee.
Background technology
At present; as knee protection air bag; form the plane bag shape that the outer peripheral edges that make identical knee side wall portion of outer shape and car body side wall portion link mutually; so that airbag inflation is tabular; thereby the air bag in the time of can configuration is expanded in the gap of the knee of passenger's knee front side and vehicle body side part; and, the frenulum of the spacing distance of configurable limit knee side wall portion and car body side wall portion (opening communique 2006-No. 131186) with reference to the spy.
In addition; the volume of existing knee protection air bag is less; be 15～20L; can be configured in the narrow gap between knee and the vehicle body side part; and; as the air bag base cloth that constitutes periphery wall, use the coated fabric of the coating that on weaving cotton cloth setting is made of silaatic etc., from the air bag of little volume, leak with gas to prevent to expand.
In addition, in existing knee protection air bag, for the position of shank butt near suppress thickness so that when the supporting knee, do not push the shank below the knee as far as possible, dispose frenulum.And, because if frenulum has only a place, then become the state that expands in the mode of pushing shank again,, become the situation of configuration frenulum on the two sections of whole air bag so below this frenulum, also dispose the 2nd frenulum near the position the housing of housing protrusion.
But, in existing knee protection air bag, frenulum is configured on the two sections, make thickness attenuation with the position of shank butt.And because the thickness of air bag reduces, so the volume of whole air bag reduces, if volume reduces, then when gas leakage was used in the appearance expansion, interior pressure can sharply descend, and descended in order to prevent that pressure is rapid in this, and being provided for prevents to expand uses the coating of gas leakage.
Promptly; in existing knee protection air bag; because the frenulum of two sections is set; perhaps use and be provided with the coated fabric of coating as employed air bag base cloth; thereby manufacturing air bag; so the manufacturing time cost of air bag increases, therefore wish to reduce the quantity of frenulum, and utilize the manufacturing air bag of weaving cotton cloth of the no coated fabric that coating is not set.
Summary of the invention
The present invention proposes in order to solve above-mentioned problem; its purpose is to provide a kind of knee protection air bag; it can change near the structure of knee restrictions of protection knee; can when avoiding the pressed state of shank, support knee reliably and protect; can reduce frenulum quantity, or utilize no coated fabric to make.
Knee protection air bag involved in the present invention constitutes, and it is configured in the below of the passenger's who takes one's seat knee front side, and folding be housed in have opening rearward protrusion with in the housing of opening.And air bag constitutes, and when expansion flows into gas, launches to expand the knee restrictions of two knees about the front side configuration of knee can be supported in the mode of protruding rearward with opening from protrusion and extend upward.In addition, air bag constitutes, and making the periphery wall that expands when finishing is the mutually the same plane bag shape of profile that makes following part: the knee side wall portion, and it is configured in aforementioned knee side; And the car body side wall portion, it is configured in the front side of aforementioned knee side wall portion, and is continuous and relative with aforementioned knee side wall portion with the outer peripheral edges of this knee side wall portion.In addition, air bag constitutes, and at internal configurations the 1st frenulum, it links aforementioned knee side wall portion and aforementioned car body side wall portion, the thickness along the relative direction of aforementioned knee side wall portion and aforementioned car body side wall portion when confined expansion is finished.The 1st frenulum is configured to, left and right directions configuration along vehicle, air bag is divided into two Room up and down of going up expansion chamber and following expansion chamber, aforementioned expansion chamber down is positioned at the below of expansion chamber, volume is less than last expansion chamber, this frenulum is configured to simultaneously, when vehicle boarded state lower gasbag expansion is finished, is positioned at the position that breaks away from from housing.And, the 1st frenulum is configured to, make the binding distance that links knee side wall portion and car body side wall portion in the scope of 50～90mm, and, a plurality of gas communication hole is set, it is used to make and flows into aforementioned expansion of going up expansion chamber from aforementioned expansion chamber down and be configured in the left and right sides with the primary flow path of gas, so that the aforementioned expansion chamber of going up begins center side expansion towards left and right directions from the left and right sides.And, when last expansion chamber is finished expansion along the vertical direction at aforementioned air bag monomer, formation is along the substantial cylindrical of left and right directions, constitute the knee restrictions, simultaneously, it is set at thicker than following expansion chamber, makes outside dimension in the scope of 150～220mm, with can support the passenger from about near the upper end of two shins to about the whole zone of front surface of two knees.In addition, following expansion chamber constitutes, be provided with at the position of car body side wall portion and air bag to be installed to the installation portion on the housing and to constitute, simultaneously, it is set at, make at aforementioned air bag monomer and finish along the vertical direction when expanding, the top of the rear surface side of the thickness direction of air bag is offset to front side in the scope of 10～70mm than the top of the rear surface side of last expansion chamber.And knee side wall portion and side body are less than or equal to 0.6L/cm by permeability to air (Fu Leizefa) 2The air bag of/min constitutes with base cloth.
In knee protection air bag involved in the present invention, when expansion is finished, be compressed by rear surface side bearing knee as the last expansion chamber of knee restrictions, absorb the kinetic energy that the passenger forwards moves.Should go up expansion chamber and be set at, knee side wall portion and car body side wall portion are less than or equal to 0.6L/cm by permeability to air (Fu Leizefa) 2The air bag of/min constitutes with base cloth, use gas leakage even expand, still make the outside dimension that expands when finishing in 150～220mm scope, thereby guarantee outside dimension (gauge of fore-and-aft direction) more than or equal to 150mm, can not cause the knee side wall portion to contact such touching at the end with the car body side wall portion, supporting near the upper end of shank to the whole zone of front surface of the knee of its top.In addition, because last expansion chamber has the outside dimension that is no more than 220mm when expansion is finished, even so narrow gaps of knee and car outside parts (steering column cover, instrument carrier panel, glove box etc.), it also can enter this gap swimmingly and expand, and also can not push back knee fiercely after expansion is finished.
And, in the air bag when expansion is finished, be compressed by rear surface side bearing knee at last expansion chamber, when absorbing the kinetic energy that the passenger forwards moves, though in following expansion chamber, the rear surface is supported shank (the shank main body of the below of shank upper end) and is compressed, but it is set at, when the expansion of air bag monomer is finished, make the balloon thickness direction the rear surface side the top than the top of the rear surface side of last expansion chamber in the scope of 10～70mm to the front side skew, and, at expansion chamber down by moment of surface bearing shank thereafter, last expansion chamber has supported the passenger who forwards moves, and reduces the kinetic energy that the passenger forwards moves.Therefore, even expansion chamber becomes the state that is supported shank by the rear surface down, the stroke that shank forwards moves is also less.
Its result, air bag can be avoided the pressed state of shank, supports reliably and protects knee.
In addition, have above 0.6L/cm with base cloth at employed air bag 2During the permeability to air of/min, be under the situation of little volume of the outside dimension (gauge of fore-and-aft direction) about 150mm at last expansion chamber, descend owing to press sharply in gas leakage causes, by on as the knee restrictions during expansion chamber supporting knee, even can avoid the pressed state of shank, the effect that also is difficult to guarantee to support knees self and reduces passenger's kinetic energy is so air bag preferably is less than or equal to 0.6L/cm with the permeability to air of base cloth 2/ min.
In addition, if the top of the rear surface of following expansion chamber than the top of the rear surface of last expansion chamber forwards side out-of-position side-play amount less than 10mm, the situation that expansion chamber fiercely pushes shank under causing easily, if surpass 70mm, then make the volume of the following expansion chamber that expansion chamber is little on the volume ratio too small, cause when airbag inflation is finished, frenulum can't be from the situation of housing disengaging, if frenulum can't break away from from housing, then might cause and stably to be configured in the knee front side with going up expansion chamber.
In addition; the reason of binding distance in the scope of 50～90mm that frenulum links knee side wall portion and car body side wall portion is; if less than 50mm; then near the knee side wall portion the frenulum and the spacing distance of car body side wall portion; it is near the thickness attenuation of the air bag the frenulum; when generation is supported the situation of knee by this position; may cause becoming the end state that touches that the knee side wall portion contacts with the car body side wall portion; can't protect knee fully; and; because the state that this position dwindles is difficult to promptly expand and supplies with to the knee restrictions with gas.And above-mentioned reason is, if the binding of the knee side wall portion of frenulum and car body side wall portion distance surpasses 90m, then the thickness of the following expansion chamber under the frenulum increases, be difficult to guarantee that above-mentioned side-play amount is more than or equal to 10mm, cause simultaneously near the concerted action in bottom easily with knee restrictions (going up expansion chamber), thereby push the situation of shank, be difficult to avoid pushing the state of shank.
And, last expansion chamber as the knee restrictions, outside dimension (gauge of fore-and-aft direction) is set at 150～220mm, though the thickness of fore-and-aft direction is increased, but the gas communication hole that is disposed at the configuration position of frenulum is configured to, make the expansion that flows into expansion chamber be configured in the left and right sides with the primary flow path of gas, expanding when flowing into gas, last expansion chamber expands successively from the left and right sides towards the center side of left and right directions.Promptly, at the expansion initial stage of air bag, though the allocation position of the air bag upper end that last expansion chamber is expanded to the left and right sides to expand when finishing, but because can keep the state that makes its thinner thickness, so can easily be configured in the front side of passenger's knee, and, make the thickness increase and expansion finished from the left and right sides towards center side afterwards, so can suitably support knee.
Therefore; in knee protection air bag involved in the present invention; by near the structure the knee restrictions that changes the protection knee; can avoid the pressed state of shank; support and protect knee reliably, frenulum can be reduced to and only separate one section that goes up expansion chamber and following expansion chamber, and; because can not use the coated fabric that complete vapor tight coating is set, (permeability to air (Fu Leizefa) is less than or equal to 0.6L/cm with base cloth and use the air bag of allowing certain gas leakage 2/ min), make so can reduce the manufacturing time cost.
Certainly; in knee protection air bag involved in the present invention; as the air bag base cloth that forms knee side wall portion and car body side wall portion; also can be by the coated fabric manufacturing that the coating that the silaatic used by anti-gas-leak etc. constitutes is set on weaving cotton cloth; if but, then can further reduce manufacturing cost by the manufacturing of weaving cotton cloth of the no coated fabric that coating is not set.
In addition, in knee protection air bag involved in the present invention, the gas communication hole not only is configured near the left and right sides of air bag, also is configured near the central authorities of air bag left and right directions.Certainly, in the case, the aperture area that is configured near the edge effluent through hole in the air bag left and right sides respectively in the gas communication hole, set greatlyyer, be configured in the left and right sides with the primary flow path of gas with the expansion that will flow into the knee restrictions than near the aperture area of central streams through hole the central authorities that are configured in the air bag left and right directions in the gas communication hole.In this structure; near because the position frenulum of the central authorities of the left and right directions of knee restrictions; can guarantee to a certain degree thickness at the airbag inflation initial stage; so in the airbag inflation way; even knee enters the lower side of knee restrictions; also because in the knee restrictions, expand towards central authorities from the left and right sides in the position directly over the frenulum, thereby can support the knee that enters and guarantee buffering effect.
In the case, the 1st frenulum is set up in parallel a plurality of central streams through holes on left and right directions, and, preferred about distance setting between the central streams through hole of two edge be wideer than the A/F size of housing left and right directions.In this structure, when airbag inflation, flow to from each central streams through hole with gas along with expanding and to go up expansion chamber, expand and the periphery of each the central streams through hole expansion chamber side that makes progress is pushed with gas.Therefore, when airbag inflation, the 1st frenulum can break away from housing at an easy rate.
In addition, also can be on air bag configuration the 2nd frenulum in the expansion chamber, link with the knee side wall portion of the rear surface side of the bond sites that the 1st frenulum front linked the car body side wall portion and last expansion chamber.And, the bond sites of the rear end side of the 2nd frenulum, in the side of the rear surface of last expansion chamber from the upper limb of knee side wall portion to and the position that links, the rear end of the 1st frenulum between the central authorities of above-below direction near, and be positioned at least near the central authorities of left and right directions, finish the mediad front side skew of left and right directions at least at top of rear surface side of the last expansion chamber of expansion so that the 2nd frenulum is not set.
In this air bag, when expansion is finished, last expansion chamber as the knee restrictions is finished with the substantial cylindrical expansion, by the restricted areas of rear surface side supporting passenger from about be compressed to the whole zone of the front surface of two knees near the upper end of two shanks, avoid pushing the state of shank, absorb the kinetic energy that the passenger forwards moves.
At this moment, as protruding the 2nd frenulum that suppresses frenulum, make the bond sites of rear end side be, in the side of the rear surface of last expansion chamber from the upper limb of knee side wall portion to and the position that links, the rear end of the 1st frenulum between the central authorities of above-below direction near, and be positioned at least near the central authorities of left and right directions, finish the mediad front side skew of the left and right directions at least at the top of the rear of side direction rear surface, rear surface side of the last expansion chamber of expansion protruding so that the 2nd frenulum is not set.Therefore, central part as the left and right directions of the rear surface side of the last expansion chamber of knee restrictions, become state by the side-lining forwards of the 2nd frenulum, about being difficult to enter between two knees, about near the upper end of the whole zone of front surface of two knees and shank, by the restricted areas in its place ahead with outside skew to the left and right not and relative state support.
In addition, make the knee restrictions be expanded under the situation of substantial cylindrical than heavy back, when airbag inflation, in the knee restrictions not and the expansion position of knee self butt enter about between two knees, can with about two knees push laterally, produce the situation that two knees and knee restrictions relatively do not contact.In the case, air bag can't absorb the kinetic energy that the passenger forwards moves reliably.But in the air bag that the 2nd frenulum is set, the central part as the left and right directions of the rear surface side of the last expansion chamber of knee restrictions becomes the state that is forwards drawn by the 2nd frenulum, thereby about can preventing to enter between two knees.
And, the connecting portion of the rear end side of the 2nd frenulum, in the side of the rear surface of last expansion chamber from the upper limb of knee side wall portion to and the position that links, the rear end of the 1st frenulum between the central authorities of above-below direction near, and be positioned at least near the central authorities of left and right directions, its front links in position identical with the front end of the 1st frenulum and car body side wall portion.Therefore, last expansion chamber is as the periphery wall in the elevation profile of fore-and-aft direction, from the bond sites of the car body side wall portion of the front end of the 1st frenulum to this car body side wall portion and knee side wall portion upper limb each other, and the position that from the rear end of upper limb to the 2 frenulums of knee side wall portion, links with the knee side wall portion, the thickness of fore-and-aft direction is increased and expansion significantly, it can expand with substantial cylindrical, does not reduce buffering effect and the upper end of supporting knee and shank.
Therefore, in the above-mentioned knee protection air bag that the 2nd frenulum is set, the knee restrictions that expands with substantial cylindrical in order to support knee, can be not with about two knees release laterally, and keep buffering effect, reliably two knees about the supporting.
And preferred the 2nd frenulum is set at, and makes the side part, rear surface of the last expansion chamber that expansion that the 2nd frenulum is not set finishes forwards be offset 5～40mm.
This be because, if owing to be provided with part that the 2nd frenulum causes restricted areas forwards the distance of side shifting less than 5mm, the meaning of the 2nd frenulum then is not set, surpassing under the situation of 40mm, near the position that the 2nd frenulum rear end side of upper end bulge and knee side wall portion link with than large tracts of land forwards side cave in the position that contacts with front surface knee in the restricted areas, integrally forwards move, and expand in the mode of extending to the oblique back lower place in the position of this bond sites below.Therefore, zone side shifting forwards with the front surface of supporting knee self, and rear surface at the position of direction oblique back lower place extension and expansion under it, rear surface concerted action with following expansion chamber, with respect to knee, the easier shank of pushing, its result, cause hindering advantage that the knee restrictions constitutes with substantial cylindrical easily, promptly avoid the pressed state of shank and the upper end of supporting knee and shank, not preferred.
In addition, under the situation of the air bag that the 2nd frenulum is set, if the periphery wall that forms air bag is made air bag by sewing up a plurality of air bags with what base cloth formed, then can make the front end of the 1st frenulum and the 2nd frenulum consistent with each other, the front end of the 1st frenulum and the 2nd frenulum is sewed together mutually and links with the car body side wall portion.Therefore, even knee protection air bag forms the structure of two sections frenulums with the 1st, 2 frenulums, the Fabrication procedure of air bag is simplified.
In addition,, the position of the main body that forms expansion chamber down and formation the 2nd frenulum is set and constitutes, the 2nd frenulum then needn't be set in addition get final product, can suppress to constitute the increase of the number of components of air bag if form the air bag base cloth of the following expansion chamber of car body side wall portion.
In addition, if the width dimensions that the 2nd frenulum is set left and right directions than the passenger about the distance of two knees narrow, then can not hinder the expansion that flows into the left and right sides of going up expansion chamber from expansion chamber down with the flowing of the primary flow path of gas, expansion chamber is expanded rapidly.But,, then not only near the central authorities of the left and right directions of last expansion chamber, also can be configured to extend with band shape in the both sides of left and right directions as long as the 2nd frenulum does not hinder the expansion that flows into the left and right sides of going up expansion chamber from following expansion chamber with the flowing of the primary flow path of gas.
Description of drawings
Fig. 1 is the summary longitudinal diagram of vehicle boarded state of the airbag device for protecting knee of the expression air bag that uses embodiments of the present invention 1.
Fig. 2 is that the summary of vehicle boarded state of the airbag device for protecting knee of expression embodiment 1 amplifies longitudinal diagram.
Fig. 3 is the schematic cross sectional view of vehicle boarded state of the airbag device for protecting knee of expression embodiment 1, and is corresponding with III-III position of Fig. 2.
Fig. 4 is the front elevation of vehicle boarded state of the airbag device for protecting knee of embodiment 1.
Fig. 5 is the front elevation of the air bag of embodiment 1.
Fig. 6 is the drawing in side sectional elevation of the air bag of embodiment 1, and is corresponding with VI-VI position of Fig. 5.
The A of Fig. 7, the B of Fig. 7 are respectively the longitudinal diagrams of the air bag of embodiment 1, and the state that expression is expanded a little and with expand state when finishing of monomer is corresponding with VII-VII figure of Fig. 5.
When Fig. 8 represents that the expansion of air bag under vehicle boarded state of embodiment 1 finished, and expression is not when have to finish as the expansion under the state of the steering column cover of on every side vehicle body side part.
Fig. 9 A～9C, Figure 10 A～10D are the figure of folding process that the air bag of embodiment 1 is described successively.
Figure 11 A, Figure 11 B are the summary longitudinal diagrams that the expansion of air bag under vehicle boarded state of embodiment 1 is described successively.
Figure 12 is the summary longitudinal diagram of the expansion under the vehicle boarded state of air bag of expression embodiment 1 when finishing etc.
Figure 13 A, Figure 13 B are the schematic cross sectional view that the expansion of air bag under vehicle boarded state of embodiment 1 is described successively.
Figure 14 is the summary longitudinal diagram of vehicle boarded state of the airbag device for protecting knee of the expression air bag that uses embodiment 2.
Figure 15 is the front elevation of the air bag of embodiment 2.
Figure 16 is the drawing in side sectional elevation of the air bag of embodiment 2, and is corresponding with XVI-XVI position of Figure 15.
Figure 17 A～17C is respectively the longitudinal diagram of the air bag of embodiment 2, and the state that expression is expanded a little and with expand state when finishing of monomer is corresponding with XVIIA-XVIIA position, XVIIB-XVIIB position, the XVIIC-XVIIC position of Figure 15.
Figure 18 is the front elevation of main composition material of the air bag of expression embodiment 2.
Figure when Figure 19 represents that the expansion of air bag under vehicle boarded state of embodiment 2 finished, and expression is not when have to finish as the expansion under the state of the steering column cover of vehicle body side part on every side.
Figure 20 is the summary longitudinal diagram that the expansion of air bag under vehicle boarded state of embodiment 2 is described successively.
Figure 21 is expand under vehicle boarded state a summary longitudinal diagram when finishing of the air bag of expression embodiment 2.
Figure 22 A～22C is the schematic cross sectional view that the expansion of air bag under vehicle boarded state of embodiment 2 is described successively.
The specific embodiment
Below with reference to accompanying drawing, preferred implementation of the present invention is described.But, the invention is not restricted to the embodiment of following discloses.Modification to claims and equivalent embodiments thereof is included in the scope of claim.
The knee protection air bag 40 of embodiment 1; in airbag device for protecting knee S, use; this airbag device for protecting knee S is shown in Fig. 1,4, and the vehicle front side that is configured in chaufeur MD is the below of Steering gear 9, can protect the knee K as passenger's chaufeur MD.
In addition, Steering gear 9 has as shown in Figure 1: Steering gear main body 10, and itself and bearing circle 8 link; And steering column cover 13, it is configured to the Steering gear main body 10 of the below of coverage direction dish 8.Steering gear main body 10 has main shaft 11 and covers main shaft 11 steering-column tube 12 on every side, and steering column cover 13 is the roughly quadrangular barrel shape that synthetic resin is made, and covers Steering gear main body 10, rearward protrudes (with reference to Fig. 4) from instrument carrier panel 14.
In addition, airbag device for protecting knee S constitutes and has shown in Fig. 1～3: the air bag 40 that is folded; Charging blower 28, it is supplied with to expand to air bag 40 and uses gas G; Housing 17, it accommodates air bag 40 and the charging blower 28 that is folded, and makes the rear view of vehicle side opening; And air cell covering 21, the rear view of vehicle side of the opening 18a of its covering shell 17.
In addition, in this manual, short of special declaration, up and down, the direction of all around is benchmark with the state that airbag device for protecting knee S is carried on the vehicle, with under the vehicle about, all around direction is consistent.
Housing 17 is shown in Fig. 2,3, for metal sheet system, it is configured in the lower side (with reference to Fig. 1) of Steering gear 9, constitutes the position of accommodating accommodate the air bag 40 that is folded, and is made of the main part 18 of case shape and the panel part 19 (with reference to Fig. 4) of extending to the outside from main part 18.Main part 18 is formed with the roughly quadrangular barrel shape at the end, has roughly rectangular opening 18a in the rear view of vehicle side.The side of outside face up and down at main part 18 disposes a plurality of hook 18b, 18c respectively, and they are used for the wall portion 25,26 that links up and down described later of air cell covering 21 is installed to housing 17.Each hook 18b, 18c insert among stop hole 25a, the 26a of binding wall portion 25,26 of air cell covering 21, end with the periphery card of stop hole 25a, 26a.
In addition, on the position away from the diapire of opening 18a of main part 18, form 2 mounting hole 18d, they are used to insert the hold-down bolt 31 of charging blower 28.And, forming through hole 18e (with reference to Fig. 3) at the position of the wall portion of the right-hand side of main part 18, it can insert the end of adaptor union 33 sides of the main body described later 29 of charging blower 28.
Panel part 19 form the main part 18 that surrounds housing 17 opening 18a around, five positions in the outer peripheral edges of panel part 19, as shown in Figure 4, link the carriage 4,5,6,7 that extends from instrument carrier panel 2 grades of main body 1 side, to be used for that housing 17 bindings are fixed on main body 1 side.In addition, above the main part 18 of panel part 19, as shown in Figure 2, form the through hole 19a that the binding wall portion 25 that makes air cell covering 21 inserts.
Air cell covering 21 is formed by the thermoplastic elastomer of olefines, constitute can covering shell 17 the rear view of vehicle side, be assembled on the housing 17.In addition, air cell covering 21 is configured in the following instrument carrier panel 14b side (with reference to Fig. 2,4) of the instrument carrier panel 14 that is made of overhead panel 14a and following instrument carrier panel 14b.Near the rear of the opening 18a of the housing 17 of air cell covering 21, dispose two fan door portions 23 respectively, they are that centre of gration is opened both sides up and down with the hinge 23a that is made of integral hinge.Above-mentioned door portion 23 is set to, and disposes around to observe from the rear to be configured to the roughly thin-wall fracture reservations 22 of H word shape.Setting is forwards extended in the mode of the main part 18 of encirclement housing 17 around door portion 23,23 cover wall portion 24,24 and binding wall 25,26 (with reference to Fig. 3,2) of portion.Cover wall portion 24 is configured to main body covered 18 the left and right sides, link wall portion 25,26 be configured to main body covered 18 about.Linking in the wall portion 25,26, as noted above, configuration stop hole 25a, 26a, it inserts up and down a plurality of hook 18b, the 18c that are separately positioned on main part 18, and the periphery card is ended.
Charging blower 28 constitutes as being configured to make axially along the column type of the left and right directions of vehicle shown in Fig. 2,3, constitutes to have roughly columned main body 29 and diffuser 30.The a plurality of gas vent 29a of one distolateral (being left end side under the situation of embodiment 1) configuration in main body 29.And, connecting adaptor union 33 in another distolateral (right-hand member side) of main body 29, the lead 34 that itself and actuating signal are imported usefulness links.Diffuser 30 be can main body covered 29 metal sheet system roughly cylindraceous, it has following parts and constitutes: clamp portion 30a, the mode clamping main body 29 of its undergauge with riveted joint; And a plurality of gas flow export 30b, it can make from the expansion of the gas vent 29a ejection of main body 29 and flow out rearward with gas G, also has a plurality of (being 2 in embodiment 1) hold-down bolt 31 of side protrusion forwards simultaneously.
In addition, when the air bag actuating circuit on carrying vehicle detects the front surface collision of vehicle, via lead 34 actuating signal is imported this charging blower 28, the not shown airbag apparatus on bearing circle 8 is carried in input simultaneously.
And when air bag 40 was folded with the state of having accommodated charging blower 28, the hold-down bolt 31 of diffuser 30 protruded from the mounting hole 43a of air bag 40, and, when air bag 40 being accommodated to the main part 18 of housing 17, this hold-down bolt 31 protrudes from housing 17, and is fastening with nut 32.And each hold-down bolt 31 is fixed by nut 32, constitutes air bag 40 is installed to installation unit on the housing 17 with charging blower 28.
Air bag 40 is shown in Fig. 5,7, form by having weaving cotton cloth that flexual polyester or polyamide thread etc. constitute, the home base shape that the width dimensions of the left and right directions that is shaped as lower side when its expansion is finished is narrower tabular, have following parts and constitute: knee side wall portion 41, it is configured in chaufeur MD side; And car body side wall portion 42, its outer peripheral edges with knee side wall portion 41 link to each other, and are configured in steering column cover 13 sides, and are relative with knee side wall portion 41 and be positioned at the front side (with reference to the long and two-short dash line of Fig. 1) of knee side wall portion 41.Air bag 40 is for making the identical plane bag shape of outer shape of knee side wall portion 41 and car body side wall portion 42.On the car body side wall portion 42 of the lower edge 40b of air bag 40 side, mounting hole 43a, 43a that formation can make the hold-down bolt 31,31 of charging blower 28 protrude, simultaneously, through hole 43b opening and make the end of adaptor union 33 sides of the main body 29 of charging blower 28 protrude (with reference to Fig. 3).The configuration position of these mounting holes 43a and through hole 43b is as the installation portion 43 on the main part 18 that air bag 40 is installed to housing 17.
This air bag 40 upper end (upper limb) 40a configuration knee restrictions 45 (with reference to Fig. 8) when expansion is finished, it makes the gauge of relative direction of knee side wall portion 41 and car body side wall portion 42 thicker than other position of air bag 40, be used for supporting driver person MD from about near the upper end LU of two shank L to about the whole zone of front surface of two knee K.And,, link the 1st frenulum 51 of knee side wall portion 41 and car body side wall portion 42 along the left and right directions configuration in the inside of the air bag 40 of the bottom of knee restrictions 45.And air bag 40 utilizes this frenulum 51 to be divided into up and down two Room, promptly as the following expansion chamber 49 of the below of the knee restrictions 45 of the last expansion chamber 44 of knee restrictions 45 and air bag 40.
On the configuration position of the frenulum 51 in air bag 40, as shown in Figure 6, dispose a plurality of gas communication hole 53, they are used to make expand goes up expansion chamber 44 with gas G from following expansion chamber 49 inflows.These gas communication holes 53 are set at, and will flow into the primary flow path MG that gas G is used in the expansion of going up expansion chamber 44 from the following expansion chamber 49 that is separated into by frenulum 51, are configured in the left and right sides, expand from the left and right sides towards the center side of left and right directions so that go up expansion chamber 44.Under the situation of embodiment 1, the whole girth of frenulum 51 outer peripheral edges combines (stitching) with the inner peripheral surface of knee side wall portion 41 and car body side wall portion 42, the left and right sides at frenulum 51 self, dispose two openings respectively and be circular edge effluent through hole 54,55 as gas communication hole 53, near the central authorities of the left and right directions of frenulum 51 self, disposing 3 openings is the circular central streams through hole 56 as gas communication hole 53.
Specifically, under the situation of embodiment 1, be configured near total aperture area (about total aperture area of edge effluent through hole 54,54 of each side and total aperture area of edge effluent through hole 55,55) of the edge effluent through hole 54,55 the left and right sides respectively, be set at respectively bigger than near the aperture area of the summation (summations of three central streams through holes 56) of the central streams through hole 56 the central authorities that are configured in left and right directions.Under the situation of embodiment 1, the internal diameter size d1 of each edge effluent through hole 54,55 is 30mm, and the internal diameter size d2 of central streams through hole 56 is 20mm.In addition, the size that the central streams through hole of the left and right sides is 56 is the size (being 244mm under the situation of embodiment 1) of the A/F size Wc (being 240mm under the situation of embodiment 1) of the opening 18a of slightly being wider than housing 17.In this structure, when air bag 40 expands, flow into from each central streams through hole 56 with gas G along with expanding and to go up expansion chamber 44, expand and the periphery of each central streams through hole 56 expansion chamber 44 sides that make progress are pushed with gas G.Therefore, when air bag 40 expanded, the 1st frenulum 51 can easily break away from from housing 17.
In addition, in the air bag 40 of embodiment 1, the air bag that constitutes periphery wall with base cloth 57 by top panel cloth 59, down front panel cloth 60 and following rear panel cloth 61 these three constitute.In addition, air bag 40 uses two to strengthen cloth 63,64 and frenulum cloth 66 formations.Top panel cloth 59 constitutes as single sheet, is the interval with the upper limb 40a of air bag 40, and the knee side wall portion 41 of frenulum 51 upper areas is linked to each other with car body side wall portion 42.Following front panel cloth 60 constitutes the position of the car body side wall portion 42 of frenulum 51 belows, and following rear panel cloth 61 constitutes the position of the knee side wall portion 41 of frenulum 51 belows.And, air bag 40 can form as following mode, promptly, top panel cloth 59 is turned back in the position of the upper limb 40a of air bag 40 side, with about two edge sew up, and, front end 51a with frenulum 51, be provided with the position stitching of the following front panel cloth 60 of strengthening cloth 64 and the upper end of strengthening cloth 63 with respect to the car body side wall portion 42 of top panel cloth 59 lower end side, the rear end 51b of frenulum 51 and the upper end of following rear panel cloth 61 are sewed up with respect to the position of the knee side wall portion 41 of the lower end side of top panel cloth 59, then, from the two ends, the left and right sides of top panel cloth 59,, the region of interest of the lower edge 40b of air bag 40 is sewed up mutually through two edge about down front panel cloth 60 and following rear panel cloth 61.
And, under the situation of embodiment 1, air bag 40 is shown in the B of Fig. 7, when expanding with monomer along the vertical direction, as can supporting driver person MD from about near the upper end LU of two shank L to about the knee restrictions 45 (with reference to Fig. 8) in whole zone of front surface of two knee K, the outside dimension D1 that makes expansion chamber 44 is the 198mm in 150～220mm scope, and the binding that makes the binding knee side wall portion 41 of frenulum 51 and car body side wall portion 42 is 60mm in 50～90mm scope apart from TL1.
In addition, under the situation of embodiment 1, following expansion chamber 49 is shown in the B of Fig. 7, be set at when air bag 40 is finished with the monomer expansion along the vertical direction, the top 49b that the 49a side direction rear, rear surface of the thickness direction of air bag 40 is protruded, compare with the top 44b that rearward protrudes of the 44a of the rear surface portion side of last expansion chamber 44, with the side-play amount OL of the 60mm in 10～70mm scope forwards lateral deviation move.
In addition, under the situation of embodiment 1, not expanding of the air bag 40 and width dimensions W0 of air bag 40 left and right directions that entirely launch is 600mm, making the length dimension H0 of the above-below direction from mounting hole 43a to upper limb 40a is 405mm, and making from mounting hole 43a to frenulum the length dimension H1 of 51 above-below direction is 125mm (with reference to Fig. 5).
In addition, under the situation of embodiment 1,, comprise and strengthen cloth 63,64 and frenulum with cloth 66 with the top panel cloth 59 of base cloth 57, front panel cloth 60, rear panel cloth 61 down down as the air bag that constitutes air bag 40 periphery walls, 58 constitute by weaving cotton cloth of the no coated fabric that coating is not set.In more detail, employed weaving cotton cloth 58 is less than or equal to 0.6L/cm for permeability to air (Fu Leizefa) 2The 0.5L/cm of/min 2/ min.
The folding process of this air bag 40 is described, shown in the A of Fig. 9, protrudes from each mounting hole 43a, the end of main body 29 can be protruded from through hole 43b, thereby charging blower 28 is housed in the air bag 40 by making hold-down bolt 31.
Then, shown in A, the B of Fig. 9, form the cross break operation of the folding line LF of left and right directions, so that the size of the above-below direction of the air bag 40 after entirely launching reduces.Under the situation of embodiment 1, so that upper end 40a is reeled to car body side wall portion 42 sides, so that upper limb 40a is near the mode of lower edge 40b, it is folding to reel, thereby forms folding position 68.Then, shown in the C of Fig. 9, be housed in the air bag 40 in the main part 18 of housing 17, near the side of the rear surface of charging blower 28, form the folding line 69 of protruding folding, can guaranteeing the space, and, make folding line 69 and lower end 40b overlapping below charging blower 28, simultaneously shown in A, the B of Figure 10, will be positioned at charging blower 28 about all the other positions 70 of air bag 40 folding to downside so that the position of charging blower 28 and near air bag 40 thereof can successfully be housed in the main part 18 of housing 17.Then, shown in C, the D of Figure 10, form, so that reduce according to the size of the left and right directions of air bag 40 along the vertical folding operation of the folding line VF of fore-and-aft direction.Under the situation of embodiment 1, if according to the left border 68a that makes the folding folding position 68 of reeling and right border 68b with the lower side of the central 68c at folding position 68 mutually approaching mode fold, then can finish the folding of air bag 40.In addition, the air bag 40 after folding is suitably by preventing the folding envelope sheet parcel that scatters.
As noted above with air bag 40 folding after, if each hold-down bolt 31 of charging blower 28 is protruded from mounting hole 18d, the end of adaptor union 33 sides of the main body 29 of charging blower 28 is protruded from through hole 18e, with charging blower 28 and folding after air bag 40 be housed in the main part 18 of housing 17, make nut 32 and each hold-down bolt 31 fastening, then charging blower 28 and air bag 40 can be fixed on the main part 18 of housing 17 (with reference to Fig. 3).
Then,, insert card and end in the stop hole 25a, the 26a that link wall portion 25,26, air cell covering 21 is assembled into (with reference to Fig. 2) on the housing 17 each hook 18b, the 18c of the main part 18 of housing 17.And, utilize carriage 4,5,6,7, the outer peripheral edges of the panel part 19 of housing 17 are fixed on main body 1 side, simultaneously, will be connected with the main body 29 of charging blower 28 with the adaptor union 33 that lead 34 links.Then, if instrument carrier panel 14 or end cover 15 (with reference to Fig. 1,2) are installed, then airbag device for protecting knee S can be carried on the vehicle.
After airbag device for protecting knee S carries on the vehicle; if actuating signal is inputed to the main body 29 of charging blower 28 via lead 34; then expand from the gas vent 29a ejection of charging blower 28 and use gas G, expanding flows in the air bag 40 (with reference to Fig. 3) via the gas vent 30b of diffuser 30 with gas G.Then; air bag 40 expands; make not shown envelope sheet fracture; and then fracture reservations 22 are ruptured; push the door portion 23,23 of air cell covering 21 and it is opened both sides up and down; shown in Fig. 1,4 long and two-short dash line, air bag 41 rearward protrudes with opening 18a from the protrusion of housing 17, launches to expand can protect the knee K of chaufeur MD.
And, in the air bag 40 of embodiment 1, when expansion is finished, be compressed by rear surface 44a side bearing knee K as the last expansion chamber 44 of knee restrictions 45, absorb the kinetic energy (with reference to Fig. 8,11,12) that the chaufeur MD as the passenger forwards moves.Should go up the knee side wall portion 41 and the car body side wall portion 42 of expansion chamber 44, by permeability to air (Fu Leizefa) for being less than or equal to 0.6L/cm 2The 0.5L/cm of/min 2The air bag of/min constitutes with base cloth 57, it is set at, leak with gas G even expand, also can be when expansion be finished, making outside dimension D1 is the interior 198mm of 150～220mm scope, thereby guarantee outside dimension (gauge of fore-and-aft direction), can not cause knee side wall portion 41 to contact and touch at the end with car body side wall portion 42 more than or equal to 150mm, can support near the upper end LU of shank L to the whole zone of front surface of the knee K of its top.In addition, because last expansion chamber 44 is when expansion is finished, outside dimension D1 does not surpass 220mm, so even knee K is less with the clearance C as the steering column cover 13 of vehicle body side part, also can successfully enter its clearance C and expand (with reference to the A of Figure 11,13 A), even finish expansion, can not push back knee K fiercely yet.
And, air bag 40 when utilizing expansion to finish, last expansion chamber 44 is compressed by rear surface 44a side bearing knee K, when absorbing the kinetic energy that chaufeur MD forwards moves, in following expansion chamber 49, the rear surface 49a supporting shank L shank main body LM of the below of the upper end LU of shank L (in detail for) is compressed (with reference to Figure 12), it is set at, when air bag 40 is finished with the monomer expansion, make the top 49b of rear surface 49a side of the thickness direction of air bag 40, compare with the top 44b of the rear surface 44a side of last expansion chamber 44, with the side-play amount OL of the 60mm in 10～70mm scope, forwards lateral deviation is moved, and, in the moment of following expansion chamber 49 by its rear surface 49a supporting shank L, last expansion chamber 44 has supported the knee K of the chaufeur MD that forwards moves, reduces the kinetic energy that chaufeur MD forwards moves.Therefore, even expansion chamber 49 becomes the state that is supported shank L by rear surface 49a down, the stroke that shank L forwards moves is also less.
Its result, air bag 40 can be avoided the pressed state of shank L (shank main body LM), supports and protect knee K reliably.
In addition, use the permeability to air of base cloth to surpass 0.6L/cm at employed air bag 2Under the situation of/min, be under the situation of little volume of the outside dimension (gauge of fore-and-aft direction) about 150mm at last expansion chamber 44, because the interior pressure that is caused by gas leakage sharply reduces, by the 44 supporting knee K of expansion chamber on as knee restrictions 45 time, even can avoid the pressed state of shank L, the effect that also is difficult to guarantee to support knees KH self and reduces the kinetic energy of chaufeur MD is so air bag preferably is less than or equal to 0.6L/cm with the permeability to air of base cloth 47 2/ min.
That is, as the outer shape identical with the air bag of embodiment 1, making air bag is 0.7L/cm with the permeability to air (Fu Leizefa) of base cloth 57 2/ min and 1.07L/cm 22 kinds of Comparative Examples 1,2 of/min, launch to expand in the vehicle boarded mode identical with the air bag 40 of embodiment 1, and, make the test of dummy's collision of the state of taking one's seat, in Comparative Examples 1,2, though avoid the situation of the pressed state of shank L only slightly to be worse than embodiment 1, but limiting performance with regard to knee K, become the situation of touching the end owing to interior pressure is not enough, the uptake deficiency of the kinetic energy in the last expansion chamber 44 is so become NG (unavailable).
In addition, if the top 49b of the rear surface 49a side of following expansion chamber 49 compares out-of-position side-play amount OL forwards with the top 44b of the rear surface 44a side of last expansion chamber 44, less than 10mm, the situation that expansion chamber 49 is acutely pushed shank L under then causing easily, if surpass 70mm, the volume too small (with reference to the rear surface 49a of the following expansion chamber 49 shown in the long and two-short dash line of Fig. 7 B) of the following expansion chamber 49 that expansion chamber 44 is little on the volume ratio then, when the expansion of air bag 40 is finished, the situation that causes frenulum 51 to break away from easily from the main part 18 of housing 17, and, because if frenulum can't break away from from the main part 18 of housing 17, then might produce and stably will go up the front side situation that expansion chamber 44 is configured in knee K, so preferred side-play amount OL is in the scope of 10～70mm.
In addition, to make the binding that links knee side wall portion 41 and car body side wall portion 42 be 60mm in 50～90mm scope apart from TL1 to frenulum 51.Promptly; if link apart from TL1 less than 50mm; then near the knee side wall portion 41 the frenulum 51 and the spacing distance of car body side wall portion 42; it is near the thickness attenuation of the air bag 40 the frenulum 51; when generation is supported the situation of knee K by this position; might become knee side wall portion 41 and be connected to the end state that touches that contacts as the car body side wall portion 42 under the state on the steering column cover 13 of vehicle body side part; can't protect knee K fully; and; also, be difficult to promptly expand with the supply of gas G to knee restrictions 45 owing to become the state that dwindles at this position.In addition, if the binding of the knee side wall portion 41 of frenulum 51 and car body side wall portion 42 surpasses 90mm apart from TL1, the thickness thickening of the following expansion chamber 49 under the frenulum 51 then, be difficult to guarantee that above-mentioned side-play amount is more than or equal to 10mm, simultaneously, shown in the last expansion chamber 44 shown in the long and two-short dash line of Fig. 8 and rear surface 44a, the 49a of following expansion chamber 49, near the concerted action bottom 45b of following expansion chamber 49 and knee restrictions 45 (going up expansion chamber 44), cause pushing the situation of shank L easily, be difficult to avoid the pressed state of shank L.Therefore, preferred frenulum 51 link knee side wall portions 41 and car body side wall portion 42 binding apart from TL1 in the scope of 50～90mm.
And, last expansion chamber 44 as knee restrictions 45, setting outside dimension (gauge of fore-and-aft direction) D1 is 150～220mm, the thickness of fore-and-aft direction is increased, and be configured in the gas communication hole 53 at the configuration position of frenulum 51, the expansion of flow into going up expansion chamber 44 is configured in the left and right sides (with reference to Fig. 5) with the primary flow path MG of gas G, when expanding, in last expansion chamber 44, expands successively from the left and right sides towards the center side of left and right directions with gas G inflow.Promptly, at the expansion initial stage of air bag 40, shown in the long and two-short dash line of Fig. 4, though the left and right sides of last expansion chamber 44 is expanded to the expand position of the upper end (upper limb 40a) when finishing of air bag 40, shown in the A of Figure 11, because can keep the state that makes its thickness attenuation, so can easily be configured in the front side of the knee K of chaufeur MD, then, because make the thickness increase and expansion finished, so can suitably support knee K from the left and right sides to center side.
Therefore; in the air bag 40 of embodiment 1; by near the structure the knee restrictions 45 that changes protection knee K; can avoid the pressed state of shank L; support and protect knee K reliably, frenulum 51 can be reduced to only is to separate one section that goes up expansion chamber 44 and following expansion chamber 49, and; can not use the vapor tight coated fabric that coating is set fully, (permeability to air (Fu Leizefa) is for being less than or equal to 0.6L/cm with base cloth and use the air bag of allowing certain gas leakage 2The 0.5L/cm of/min 2/ min) 57, make time cost and make so can reduce.
Certainly,, also can make with base cloth 57 as the air bag that forms knee side wall portion 41 and car body side wall portion 42 by the coated fabric that the coating that the silaatic used by anti-gas-leak etc. constitutes is set on weaving cotton cloth.The permeability to air of coated fabric in this case (Fu Leizefa) is 0L/cm 2/ min.But, if shown in the air bag 40 of enforcement mode 1,58 make by weaving cotton cloth of the no coated fabric that coating is not set, then can reduce manufacturing cost.
In addition, in the air bag 40 of embodiment 1, as gas communication hole 53, be not only near near near the edge effluent through hole 54,55 of the left and right sides (the left end 40c or the right-hand member 40d) of air bag 40, also dispose near the central streams through hole 56 of central authorities of the left and right directions that is positioned at air bag 40.And, near the aperture area of the edge effluent through hole 54,55 the left and right sides that is configured in air bag 40 respectively in setting gas communication hole 53, aperture area than near the central streams through hole 56 the central authorities of the left and right directions that is configured in air bag 40 in gas communication hole 53 is big, so that the expansion that flows into to knee restrictions 45 is configured in the left and right sides with the primary flow path MG of gas G.Therefore; in this air bag 40; near because the position the frenulum 51 of the central authorities of the left and right directions of knee restrictions 45; can guarantee thickness to a certain degree at the expansion initial stage of air bag 40, so in the way that air bag 40 expands; even knee K enters the knee 45b side of knee restrictions 45; also can utilize knee restrictions 45, be expanded towards central authorities from the left and right sides in the position directly over the frenulum 51, thereby can guarantee the knee K that the supporting of buffering effect ground enters.
The air bag 40A of embodiment 2 as shown in figure 14, with embodiment 1 in the same manner, in airbag device for protecting knee S, use.This airbag device for protecting knee S and embodiment 1 except air bag 40A, also have following parts and constitute in the same manner: charging blower 28, and it is supplied with to expand to air bag 40A and uses gas G; Housing 17, it accommodates folding air bag 40 and charging blower 28, makes the rear view of vehicle side opening; And air cell covering 21, the rear view of vehicle side of the opening 18a of its covering shell 17.
The air bag 40A of embodiment 2 only constitutes that to have the 2nd frenulum 52 this point different with the air bag 40 of embodiment 1.Promptly, this air bag 40A is shown in Figure 15,17, with embodiment 1 in the same manner, form by having weaving cotton cloth that flexual polyester or polyamide thread etc. constitute, the home plate shape that the width dimensions of the left and right directions that is shaped as lower side that making expands when finishing reduces tabular, it has following parts and constitutes: knee side wall portion 41, and it is configured in chaufeur MD side; And car body side wall portion 42, its outer peripheral edges with knee side wall portion 41 link to each other, and are configured in steering column cover 13 sides, and are relative with knee side wall portion 41 and be positioned at the front side (with reference to the long and two-short dash line of Figure 14) of knee side wall portion 41.In addition, this air bag 40A is also for making the identical plane bag shape of outer shape of knee side wall portion 41 and car body side wall portion 42.And, on the car body side wall portion 42 of the lower edge 40b of air bag 40A side, mounting hole 43a, 43a that formation can make the hold-down bolt 31,31 (with reference to Figure 17 A) of charging blower 28 protrude, simultaneously, the through hole 43b opening that the end of adaptor union 33 (not shown) side of the main body 29 of charging blower 28 is protruded.In air bag 40A, also make the configuration position of these mounting holes 43a and through hole 43b, as the installation portion 43 on the main part 18 that air bag 40A is installed to housing 17.
In addition, upper end (upper limb) 40a of air bag 40A when expansion is finished, configuration knee restrictions 45 (with reference to Figure 19,21,22), the gauge of the relative direction of its knee side wall portion 41 and car body side wall portion 42 is thicker than other position of air bag 40A, to be used to support knee K.The knee restrictions 45 of embodiment 2 constitutes, restricted areas 46 is configured in rear surface 44a side, this restricted areas 46 can supporting driver person MD from about near the upper end LU of two shank L to about the whole zone of front surface of two knee K, area broad up and down.And at internal configurations the 1st frenulum 51 and the 2nd frenulum 52 of air bag 40A, their link knee side wall portion 41 and car body side wall portion 42, when confined expansion is finished along the thickness of the relative direction of knee side wall portion 41 and car body side wall portion 42.51 configurations of the 1st frenulum are as being divided into air bag 40A up and down a plurality of separation frenulums, and the protrusion that 52 configurations of the 2nd frenulum suppress to protrude rearward as restricted areas 46 is pulled to front side partly suppresses frenulum.
Specifically, the 1st frenulum 51 and embodiment 1 are in the same manner, the upper end side of the air bag 40A that being configured in expands when finishing, the following expansion chamber 49 that air bag 40A is divided into the last expansion chamber 44 that constitutes knee restrictions 45 and last expansion chamber 44 belows by frenulum 51 two Room about this.
The configuration position of the 1st frenulum 51 in air bag 40A, as shown in figure 16, with embodiment 1 in the same manner, configuration is used to make expand and flows into a plurality of gas communication hole 53 of going up expansion chamber 44 with gas G from expansion chamber 49 down.These gas communication holes 53 are configured to, and will flow into the primary flow path MG that gas G is used in the expansion of going up expansion chamber 44 from the following expansion chamber 49 that is separated into by the 1st frenulum 51, are configured in the left and right sides, expand from the left and right sides towards the center side of left and right directions so that go up expansion chamber 44.Embodiment 2 and embodiment 1 are in the same manner, the whole girth of the outer peripheral edges of the 1st frenulum 51 combines (stitching) with the inner peripheral surface of knee side wall portion 41 and car body side wall portion 42, the left and right sides at the 1st frenulum 51 self, dispose two edge effluent through holes 54,55 respectively as gas communication hole 53 with the circular open in big footpath, near the central authorities of the left and right directions of the 1st frenulum 51 self, dispose 3 central streams through holes 56 as gas communication hole 53 with the circular open of path.
In addition, in embodiment 2, with embodiment 1 in the same manner, be configured near total aperture area (about total aperture area of edge side opening opening 54,54 of each side and total aperture area of edge effluent through hole 55,55) of the edge effluent through hole 54,55 the left and right sides respectively, be set at respectively bigger than near the aperture area of the summation (summations of three central streams through holes 56) of the central streams through hole 56 the central authorities that are configured in left and right directions.The internal diameter size d1 of this each edge effluent through hole 54,55 is 30mm, and the internal diameter size d2 of central streams through hole 56 is 20mm.In addition, size that the central streams through hole of the left and right sides is 56 and embodiment 1 also are the size (being 300mm under the situation of embodiment 2) of the A/F size Wc (under the situation of embodiment 2 for 240mm) of the opening 18a of being wider than housing 17 in the same manner.
And, last expansion chamber 44 as knee restrictions 45, with embodiment 1 in the same manner, shown in the C of Figure 17, it constitutes, when air bag 40 was expanded with monomer along the vertical direction, outside dimension D1 was the 198mm in 150～220mm scope, and the binding knee side wall portion 41 of the 1st frenulum 51 and the binding of car body side wall portion 42 are 60mm in 50～90mm scope apart from TL1.
In addition, following expansion chamber 49 is shown in the C of Figure 17, with embodiment 1 in the same manner, be set at, when air bag 40A finishes with the monomer expansion along the vertical direction, the top 49a that the 49a side direction rear, rear surface of the thickness direction of air bag 40A is protruded, the top 44b that protrudes with the 44a side direction rear, rear surface of last expansion chamber 44 compares, with the side-play amount OL of the 60mm in 10～70mm scope forwards lateral deviation move.
In addition, in this air bag 40A, also making the width dimensions of the left and right directions of the air bag 40A that does not expand and entirely launch is 600mm, the length dimension H0 of the above-below direction from mounting hole 43a to upper limb 40a is 405mm, is 125mm (with reference to Figure 15) from the length dimension H1 of the above-below direction of mounting hole 43a to the 1 frenulum 51.Link the 1st frenulum 51 front end 51a car body side wall portion 42 bond sites 42b and link the bond sites 41b of the knee side wall portion 41 of rear end 51b, be set at when the outer peripheral edges that make knee side wall portion 41 and car body side wall portion 42 are consistent and overlapping, all be positioned at position (with reference to the A of Figure 17) apart from the lower edge 40b equal height of air bag 40A.
The 2nd frenulum 52 links the knee side wall portion 41 of the 44a of the rear surface portion side of the bond sites 42b of the front end 51a side of the 1st frenulum 51 and car body side wall portion 42 and last expansion chamber 44 shown in A～C of Figure 17.And, the 2nd frenulum 52, for make the 2nd frenulum 52 is not set and the central 44d of the left and right directions at least of the top 44b of the rear surface side of the last expansion chamber 44 finish of expanding forwards lateral deviation move, make the bond sites of rear end 52b, be located at expansion chamber 44 rear surface 44a side from the upper limb 41a of knee side wall portion 41 to and the position 41b that links of the rear end 51b of the 1st frenulum between the central authorities of above-below direction near (near the central 44c), and be positioned at least near the central 44d of left and right directions, thereby inhibition is outstanding rearward with the bond sites 41c of the rear surface 44a side binding of last expansion chamber 44.
Under the situation of embodiment 2, binding between the bond sites 41c of the front end 52a of the 2nd frenulum 52 and the bond sites 42b of car body side wall portion 42 and rear end 52b and knee side wall portion 41 is apart from TL2, be set at 130mm, expand so that the 2nd frenulum 52 the is not set rear surface 44a side of the last expansion chamber 44 finish, forwards side is offset with the side-play amount PL of the 20mm in 5～40mm scope partly.
In addition, in the air bag 40A of embodiment 2, as shown in figure 18, the air bag that constitutes periphery wall is with base cloth 57, by top panel cloth 59, down front panel cloth 60, and down rear panel cloth 61 these three constitute.In addition, in air bag 40A, use two to strengthen cloth 63,64 and the 1st frenulum cloth 66.The 2nd frenulum 52 forms with following front panel cloth 60.That is, following front panel cloth 60 constitutes to have: main body 60a, and it constitutes the car body side wall portion 42 of the following expansion chamber 49 of configuration installation portion 43; And the 2nd frenulum 60b of portion of the 2nd frenulum 52 usefulness of extending from the upper end of main body 60a.The 2nd frenulum 60b of portion will be away from the front end of main body 60a, constitutes as the rearward end 60c of the rear end 52b that constitutes the 2nd frenulum 52, at rearward end 60c suturing part 60d is set, and it links with the bond sites 41c of knee side wall portion 41 by sewing up.Top panel cloth 59 constitutes with single sheet, is the interval with the upper limb 40a of air bag 40A, makes the knee side wall portion 41 of the upper area of the 1st frenulum 51 link to each other with car body side wall portion 42 (with reference to the A of Figure 17).The main body 60a of following front panel cloth 60 constitutes the position of the car body side wall portion 42 of the 1st frenulum 51 belows, and following rear panel cloth 61 constitutes the position of the knee side wall portion 41 of the 1st frenulum 51 belows.And, air bag 40A can form as following mode, promptly, the rear end 52b of the 2nd frenulum 52 is sewn onto knee side wall portion 41 sides of top panel cloth 59, this top panel cloth 59 is turned back in the position of the upper limb 40a of air bag 40A side, with about two edge sew up, simultaneously with the front end 51a of the 1st frenulum 51, the position that becomes the front end 52a of the 2nd frenulum 52 in the upper end of main body 60a of the following front panel cloth 60 of strengthening cloth 64 is set, and the upper end of reinforcement cloth 63, overlapping and sew up with respect to the position of the car body side wall portion 42 of the lower end side of top panel cloth 59, the rear end 51b of the 1st frenulum 51 and the upper end of following rear panel cloth 61 are sewed up with respect to the position of the knee side wall portion 41 of the lower end side of top panel cloth 59, then, two edge from about the top panel cloth 59, via two edge about down front panel cloth 60 (main body 60a) and following rear panel cloth 61, the overlapping part of the outer peripheral edges of the lower edge 40b of air bag 40A is sewed up mutually.
In addition, the situation of embodiment 2 and embodiment 1 are in the same manner, as the air bag of the periphery wall that the constitutes air bag 40A top panel cloth 59 of base cloth 57, following front panel cloth 60, following rear panel cloth 61, also comprise and strengthen cloth 63,64 and the 1st frenulum with cloth 66,58 constitute by weaving cotton cloth of the no coated fabric that coating is not set.In addition, in detail, employed 58 the permeability to air (Fu Leizefa) of weaving cotton cloth is for being less than or equal to 0.6L/cm 2The 0.5L/cm of/min 2/ min.
This air bag 40A and embodiment 1 are folding in the same manner, and carry on the vehicle.
In this embodiment 2; after airbag device for protecting knee S carries on the vehicle; if via the main body 29 input action signals of lead 34 to charging blower 28; then the gas vent 29a (not shown) of charging blower 28 ejection is expanded and is used gas G; expand with the gas vent 30b (not shown) of gas G, flow in the air bag 40A via diffuser 30.Then; air bag 40A expands; make not shown envelope sheet fracture; and then the fracture reservations 22 (not shown) of air cell covering 21 are ruptured; push the door portion 23,23 of air cell covering 21 and it is opened both sides up and down; shown in the long and two-short dash line of Figure 14, rearward protrude with opening 18a from the protrusion of housing 17, launch to expand can protect the knee K of chaufeur MD.
And, in the air bag 40A of embodiment 2, when expansion is finished, last expansion chamber 44 as knee restrictions 45, finish expansion with substantial cylindrical, by the restricted areas 46 of rear surface 44a side, supporting driver person MD from about near the upper end LU of two shank L to the whole zone of the front surface of two knee K and be compressed, avoid pushing the state of shank L, absorb the kinetic energy (with reference to Figure 19,21,22) that chaufeur MD forwards moves.
At this moment, as protruding the 2nd frenulum 52 that suppresses frenulum, for make the 2nd frenulum 52 is not set and the central 44d of the left and right directions at least of the top 44b of protrusion rearward of the rear surface side of the last expansion chamber 44 finish of expanding forwards lateral deviation move, make the bond sites of rear end 52b side, in the 44a side of the rear surface of last expansion chamber 44 from the upper limb 41a of knee side wall portion 41 to and the position 41b that links of the rear end 51b of the 1st frenulum between the central authorities (central 44c) of above-below direction near, and be positioned at (with reference to the A of Figure 15, Figure 17) near the central 44d of left and right directions at least.Therefore, near the central 44d as the left and right directions of the rear surface 44a side of the last expansion chamber 44 of knee restrictions 45, become state by the 2nd frenulum 52 side-lining forwards, about being difficult to enter between the two knee K, about near the upper end LU of the whole zone of front face of two knee K and shank L, with can not be to the left and right outside skew and relative state, by restricted areas 46 supportings in its place ahead (with reference to Figure 22 A～C).
And, the 2nd frenulum 52 makes the bond sites of rear end 52b side, be positioned at expansion chamber 44 rear surface 44a side from the upper limb 41a of knee side wall portion 41 to the central 44c of the above-below direction of the bond sites 41b of the rear end 51b of the 1st frenulum 51 near, and be positioned at least near the central 44d of left and right directions, front end 52a side with the identical position of front end 51a of the 1st frenulum 51, link with car body side wall portion 42.Therefore, last expansion chamber 44 is as the periphery wall in the elevation profile of fore-and-aft direction, as B, the C of Figure 17 or shown in Figure 19, from the bond sites 42b of the front end 51a of the 1st frenulum 51 and car body side wall portion 42 to this car body side wall portion 42 and knee side wall portion 41 upper limb 42a, 41a each other, and then from the rear end 52b of upper end 41a to the 2 frenulums 52 of knee side wall portion 41 and the bond sites 41c of knee side wall portion 41, the thickness of fore-and-aft direction can be increased and expands significantly, be expanded to substantial cylindrical, can not reduce buffering effect and support the upper end LU of knee K and shank L.In addition, in A～C of Figure 22, the operating state of the air bag 40A of embodiment 2 is shown, with the operating state of the air bag 39 of the Comparative Examples that long and two-short dash line illustrates except the 2nd frenulum 52 is not set, other structure is identical with the air bag 40A of embodiment 2 with solid line.In the air bag 39 of Comparative Examples, shown in the B of Figure 22, about it enters significantly between the two knee K, can with about two knee K push laterally.
Therefore, in the air bag 40A of embodiment 2, be expanded to the knee restrictions 45 of substantial cylindrical in order to support knee K, two knee K about can not releasing laterally, and keep buffering effect, thus two knee K about can supporting reliably.
In addition, the air bag 40A of embodiment 2, as sewing up the air bag of making that air bag makes with base cloth 57, can make front end 51a, the 52a of the 1st frenulum 51 and the 2nd frenulum 52 consistent with each other, front end 51a, the 52a of the 1st frenulum 51 and the 2nd frenulum 52 be sewed together and link with car body side wall portion 42 (top panel cloth 59 or the main body 60a of front panel cloth 60) down, even air bag 40A is the structure with two sections frenulums of the 1st frenulum 51 and the 2nd frenulum 52, the Fabrication procedure of air bag 40A is simplified.
In addition, in this air bag 40A, form the air bag base cloth (following front panel cloth 60) 57 of the following expansion chamber 49 of car body side wall portion 42, the main body 60a that expansion chamber 49 sides under forming are set constitutes with the 60b of portion with the 2nd frenulum that forms the 2nd frenulum 52.Therefore, needn't prepare to get final product, can suppress to constitute the increase of the number of components of air bag 40A as the 2nd frenulum 52 of separate part.
In addition, in embodiment 2, though it is roughly cylindric that last expansion chamber 44 is expanded to, the thickness of fore-and-aft direction is increased, but be configured in the 1st frenulum 51 the configuration position gas communication hole 53 as shown in figure 15, make to flow to the expansion of going up expansion chamber 44 from following expansion chamber 51 and be configured in the left and right sides, when expanding, in last expansion chamber 44, expand successively from the left and right sides towards the center side of left and right directions with gas G inflow with the primary flow path MG of gas G.Promptly, at the expansion initial stage of air bag 40A, in last expansion chamber 44, though the left and right sides is expanded to the expand position of upper end (upper limb) 40a when finishing of air bag 40A, as shown in figure 20, because can keep the state that makes its thickness attenuation, so can easily be configured in the front side of the knee K of chaufeur MD, then, because make the thickness increase and finish expansion, so can suitably support from the front surface of upper end LU to the two knee K of two shank L from the left and right sides to center side.
In addition, the 2nd frenulum 52 of embodiment 2, illustration width dimensions WT than about two knees apart from KL (with reference to Figure 22, be generally about 400mm) frenulum of narrow 120mm (with reference to Figure 18), but as long as do not hinder the expansion that flows into the left and right sides of going up expansion chamber 44 from following expansion chamber 49 flowing with the primary flow path MG of gas G, then be not only near the central 44d of left and right directions of expansion chamber 44, also can constitute the 2nd frenulum 52A (with reference to the long and two-short dash line of Figure 18) that extends with band shape in the both sides of left and right directions.Certainly, in embodiment 2, the 2nd frenulum 52 is set the width dimensions WT of left and right directions narrower than the distance of two knee K about the passenger, do not hinder the expansion that flows into the left and right sides of going up expansion chamber 44 from following expansion chamber 49 with the flowing of the primary flow path MG of gas G, expansion chamber 44 is promptly expanded.
In addition, in the air bag 40A of embodiment 2, following expansion chamber 49 is also at the position of car body side wall portion 42, setting is installed to the installation portion 43 on the main part 18 of housing 17, shown in Figure 19,21,22, it constitutes, when air bag 40A expansion is finished, the configuration position that makes the 1st frenulum 51 i.e. upper end 49c side rearward breaks away from from the main part 18 of housing 17, with can be from expansion chamber on the supported underneath 44.Promptly, following expansion chamber 49, because can make the bond sites 42b of front end 51a, 52a side and the car body side wall portion 42 of the 1st frenulum 51 and the 2nd frenulum 52, main part 18 from housing 17 when expansion is finished breaks away from, so can stably support expansion chamber 44, can will go up the restricted areas 46 of the rear surface 44a side of expansion chamber 44, be configured in anterior position reliably from the upper end LU of shank L to the front surface of knee K.
In addition, in embodiment 2, last expansion chamber 44 is set at, making the outside dimension D1 that expands when finishing is the interior 198mm of 150～220mm scope, and the 2nd frenulum 52 is set at, make the rear surface 44a side that the 2nd frenulum 52 is not set and finishes the last expansion chamber 44 of expansion, local side forwards is offset with the side-play amount PL of the 20mm in 5～40mm scope.
In this structure, at the position that does not dispose the 2nd frenulum 52, last expansion chamber 44 can be guaranteed the outside dimension (gauge of fore-and-aft direction) more than or equal to 150mm, can not cause knee side wall portion 41 and be connected to, can support the upper end LU of knee K and shank L as touching at the end that the car body side wall portion 42 under the state on the steering column cover 13 of vehicle body side part contacts.In addition, because last expansion chamber 44 outside dimension D1 when expansion is finished does not surpass 220mm, so even knee K is narrower with the clearance C as the steering column cover 13 of vehicle body side part, also can successfully enter this gap and expansion, even finish expansion, also can not push back the upper end LU of knee K or shank L fiercely.
And, if owing to be provided with part that the 2nd frenulum 52 causes restricted areas 46 forwards the miles of relative movement of side (side-play amount) PL less than 5mm, the meaning of the 2nd frenulum 52 then is not set, surpassing under the situation of 40mm, near the side depression forwards in large area rear end 52b side of the 2nd frenulum 52 of last expansion chamber 44 and the bond sites 41 of knee side wall portion 41, the position integral body that contacts with the front surface of knee K in the restricted areas 46 forwards moves, and expands to extension to the oblique back lower place in the position of the below of its bond sites 41c.Therefore, the zone of the front surface of supporting knee K self is side shifting forwards, and to the rear surface 46b of the lower side at the position of expanding, the oblique back lower place of its below (with reference to the long and two-short dash line of the B of Figure 17) to extension, rear surface 49a concerted action with following expansion chamber 49, compare the easier shank L that pushes with knee K, its result, cause hindering advantage that knee restrictions 45 is constituted with substantial cylindrical easily, promptly avoid the pressed state of shank L and support the upper end LU of knee K and shank L, so not preferred.Therefore, in embodiment 2, make owing to be provided with the 2nd frenulum 52 cause restricted areas 46 parts forwards the miles of relative movement of side (side-play amount) PL be 20mm in 5～40mm scope, though be the rear surface 46a of upper side at interval and the rear surface 46b of lower side with the rear end 52b of the 2nd frenulum 52 in the restricted areas 46 of knee restrictions 45, side shifting slightly forwards, but can guarantee the area of broad and support the upper end LU of knee K and shank L.
In addition, in the 1st, 2 embodiments,, be illustrated in 51 upper sheds of the 1st frenulum and be circular situation as gas communication hole 53, but be arranged on the gas communication hole 53 on the frenulum 51, also can opening be polygonal shape oval, that comprise quadrangle such as oblong.In addition, the edge that also can make frenulum 51 is the local state that does not link with knee side wall portion 41 or car body side wall portion 42, and making between the edge of this frenulum 51 and knee side wall portion 41 or the car body side wall portion 42 becomes gas communication hole 53.For example, also two edge about frenulum 51 can be disposed away from the left border 40c of the inner peripheral surface side of air bag 40 or right border 40d, make the gap between the inner peripheral surface of the edge of this frenulum 51 and air bag 40 constitute gas communication hole 53.
In addition; in the 1st, 2 embodiments; the air bag 40, the 40A that are used for protecting the knee K airbag device for protecting knee S of chaufeur MD to use with the below that is configured in Steering gear 9 are illustrated as example, but also can apply the present invention to be configured in the air bag of airbag device for protecting knee in front passenger's seat the place ahead.

Claims (9)

1. knee protection air bag, it is configured in the below of the passenger's who takes one's seat knee front side, and folding be housed in have opening rearward protrusion with in the housing of opening,
It constitutes, when expansion flows into gas, launches to expand in the mode of protruding rearward with opening from aforementioned protrusion and extend upward, and at the front side of aforementioned knee, the knee restrictions of two knees about configuration can be supported,
Periphery wall when expansion is finished constitutes as making the mutually the same plane bag shape type of profile of following part: the knee side wall portion, and it is configured in aforementioned knee side; And the car body side wall portion, it is configured in the front side of aforementioned knee side wall portion, and is continuous and relative with aforementioned knee side wall portion with the outer peripheral edges of this knee side wall portion,
And, constitute at internal configurations the 1st frenulum, the 1st frenulum links aforementioned knee side wall portion and aforementioned car body side wall portion, when confined expansion is finished along the thickness of the relative direction of aforementioned knee side wall portion and aforementioned car body side wall portion,
It is characterized in that,
Aforementioned frenulum is configured to,
Left and right directions configuration along vehicle, so that being divided into, aforementioned air bag goes up expansion chamber and following expansion chamber two Room about this, this time expansion chamber is positioned at the below of expansion chamber on this, its volume is less than the aforementioned expansion chamber of going up, this frenulum is configured to simultaneously, be positioned at the position that breaks away from from aforementioned housing when aforementioned airbag inflation is finished under vehicle boarded state, and
Make the binding distance that links aforementioned knee side wall portion and aforementioned car body side wall portion, be in the scope of 50～90mm, and,
A plurality of gas communication hole is set, and it makes that flowing into aforementioned expansion of going up expansion chamber from aforementioned expansion chamber down is configured in the left and right sides with the primary flow path of gas, is used to make the aforementioned expansion chamber center side of the direction expansion to the left and right from the left and right sides of going up,
The aforementioned expansion chamber of going up is when aforementioned air bag monomer expansion is along the vertical direction finished, form the substantial cylindrical of direction extension to the left and right, constitute aforementioned knee restrictions, it is set at thicker than expansion chamber under aforementioned simultaneously, its outside dimension is in the scope of 150～220mm, with can support the passenger from about near the upper end of two shins to about the whole zone of front surface of two knees
Aforementioned expansion chamber down constitutes, be provided with at the position of aforementioned car body side wall portion aforementioned air bag is installed in installation portion on the aforementioned housing, be set at simultaneously, when aforementioned air bag monomer expansion is along the vertical direction finished, make the top of the rear surface side of aforementioned balloon thickness direction, compare with aforementioned top of going up the rear surface side of expansion chamber, in the scope of 10～70mm, be offset to front side
And aforementioned knee side wall portion and aforementioned car body side wall portion are less than or equal to 0.6L/cm by permeability to air 2The air bag of/min constitutes with base cloth, and this permeability to air is measured according to Fu Leizefa.
2. knee protection air bag as claimed in claim 1 is characterized in that,
Aforementioned air bag base cloth is formed by weaving cotton cloth of no coated fabric, and it becomes the coating that anti-gas-leak is used is not set.
3. knee protection air bag as claimed in claim 1 is characterized in that,
Aforementioned gas communication hole is configured near the central authorities of left and right directions of aforementioned air bag and near the left and right sides of aforementioned air bag,
The aperture area that is configured near the edge effluent through hole in the aforementioned air bag left and right sides respectively in the aforementioned gas communication hole is set at bigger than near the aperture area of the central streams through hole the central authorities that are disposed at aforementioned air bag left and right directions in the aforementioned gas communication hole.
4. knee protection air bag as claimed in claim 1 is characterized in that,
Aforementioned central streams through hole is set up in parallel a plurality of on left and right directions,
About distance between the aforementioned central streams through hole of two edge, be set at wideer than the A/F size of the left and right directions of aforementioned housing.
5. knee protection air bag as claimed in claim 1 is characterized in that,
Configuration the 2nd frenulum in the expansion chamber on aforementioned, with bond sites and the aforementioned aforementioned knee side wall portion of going up the rear surface side of expansion chamber that links aforementioned the 1st frenulum front and aforementioned car body side wall portion,
The 2nd frenulum, make the bond sites of rear end side, on aforementioned the rear surface side of expansion chamber from the upper limb of aforementioned knee side wall portion to and the position that links, the rear end of aforementioned the 1st frenulum between the central authorities of above-below direction near, and be positioned at least near the central authorities of left and right directions, the mediad front side skew of the left and right directions at least at the top of the aforementioned rear surface side that goes up expansion chamber finished of expanding so that the 2nd frenulum is not set
The 2nd frenulum disposes as protruding the inhibition frenulum, and its bond sites that suppresses to link with the aforementioned rear surface side that goes up expansion chamber is rearward protruded.
6. knee protection air bag as claimed in claim 5 is characterized in that,
Aforementioned the 2nd frenulum is set at, and makes the aforementioned rear surface side that goes up expansion chamber that aforementioned the 2nd frenulum is not set and expands and finish, and forwards is offset 5～40mm partly.
7. knee protection air bag as claimed in claim 5 is characterized in that,
Aforementioned periphery wall forms as being sewed up with base cloth by the multi-disc air bag makes air bag and constitutes,
The 1st frenulum and the 2nd frenulum are sewed together front end mutually, link with the car body side wall portion.
8. knee protection air bag as claimed in claim 7 is characterized in that,
The aforementioned air bag of expansion chamber down of the formation of aforementioned car body side wall portion constitutes with base cloth, has main body that forms aforementioned expansion chamber side down and the position that forms aforementioned the 2nd frenulum.
9. knee protection air bag as claimed in claim 5 is characterized in that,
The width dimensions of the left and right directions of aforementioned the 2nd frenulum is set at narrower than the distance of two knees about the passenger.
CNA2008101488356A 2007-09-27 2008-09-27 Airbag for knee protection Pending CN101396996A (en)

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JP2007252567A JP4530018B2 (en) 2007-09-27 2007-09-27 Knee protection airbag

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CN102745166A (en) * 2012-03-09 2012-10-24 浙江吉利汽车研究院有限公司 Side airbag for vehicles
CN103496351A (en) * 2013-09-17 2014-01-08 锦州锦恒汽车安全系统有限公司 Automobile knee airbag
CN104742849A (en) * 2015-03-18 2015-07-01 延锋百利得（上海）汽车安全系统有限公司 Safety air bag device for knees
CN105383431A (en) * 2014-08-25 2016-03-09 福特全球技术公司 Vehicle airbag appendage
CN112874465A (en) * 2019-11-29 2021-06-01 丰田自动车株式会社 Knee airbag device

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JP2002337654A (en) * 2001-05-21 2002-11-27 Toyoda Gosei Co Ltd Air bag device for protecting knee
JP2007055608A (en) * 2001-05-21 2007-03-08 Takata Corp Occupant leg protecting device
JP3687602B2 (en) * 2001-12-10 2005-08-24 トヨタ自動車株式会社 Vehicle occupant knee protection device
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CN102745166A (en) * 2012-03-09 2012-10-24 浙江吉利汽车研究院有限公司 Side airbag for vehicles
CN103496351A (en) * 2013-09-17 2014-01-08 锦州锦恒汽车安全系统有限公司 Automobile knee airbag
CN105383431A (en) * 2014-08-25 2016-03-09 福特全球技术公司 Vehicle airbag appendage
CN104742849A (en) * 2015-03-18 2015-07-01 延锋百利得（上海）汽车安全系统有限公司 Safety air bag device for knees
CN112874465A (en) * 2019-11-29 2021-06-01 丰田自动车株式会社 Knee airbag device

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Open date: 20090401