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Dokumentenidentifikation EP1541431 11.10.2007
EP-Veröffentlichungsnummer 0001541431
Titel Schlauch für Zufuhr und Verteilung von Aufblasgas
Anmelder Toyo Boseki K.K., Osaka, JP;
Autoliv Development AB, Vargarda, SE
Erfinder Kitamura, Mamoru, Osaka-shi Osaka 530-8230, JP;
Fujii, Tamotsu, Osaka-shi Osaka 530-8230, JP
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60222184
Vertragsstaaten DE, FR, GB, SE
Sprache des Dokument EN
EP-Anmeldetag 09.10.2002
EP-Aktenzeichen 050049642
EP-Offenlegungsdatum 15.06.2005
EP date of grant 29.08.2007
Veröffentlichungstag im Patentblatt 11.10.2007
IPC-Hauptklasse B60R 21/26(2006.01)A, F, I, 20051017, B, H, EP

Beschreibung[en]

The present invention relates to a hose for introduction and distribution of inflator gas used for an air bag apparatus against the side collision which protects the persons in the car upon crash from the side of the car. More particularly, it relates to a hose for introduction and distribution of inflator gas which is optimum for controlling the inflator gas flow where the hose has a distribution hole and is coated at least at one side.

In driver's seat and assistant driver's seat, there are installed air bag apparatuses which expand the air bag to constrain the drivers upon collision of the car. The air bag apparatus is composed of an inflator which is a device for generation of gas and, an air bag which expands by the inflator gas and an air bag case receiving them.

In recent years, there has been a big demand for installment of an air bag apparatus for side collision called a curtain air bag coping with the side collision in addition to the front collision at the driver's seat and the assistant driver' s seat. With regard to the air bag for side collision, a thing being folded and received in a center pillar and front pillar where inflator gas is introduced from the rear part has been considered. Although it is necessary that the air bag for side collision is instantly developed in a planar form between the door and the passenger, there is apt to happen a problem that unusual pressure is applied at the part where inflator gas is introduced resulting in burst. In order to resist the local pressure, it is necessary to use thick fiber or highly strong fiber such as Kevlar to reinforce the strength of the bag as a whole. When the fiber is made thick, it becomes bulky and causes a problem in its receiving property whereby that is less practical. When a highly strong fiber is used, the cost becomes high causing a problem. It has been investigated that, by paying attention to distribution of inflator gas, metal tube or planar sheet is sewed to make a cylindrical shape as a distribution hose. However, when metal tube is used, although the strength is satisfactory, the tube lacks in softness and flexibility and there is a problem in receiving it. In addition, since metal has a good heat transfer and melts the air bag near the inflator, there is a problem of its use as an air bag for side collision which is demanded to keep the pressure for relatively long time. On the other hand, in the case where planar sheet is sewed to make a cylindrical shape, there causes breakage from the sewed area or breakage by the heat of inflator from near the inlet of the inflator whereby no satisfactory product has been available.

It is the current state that, in the above-mentioned conventional air bags for side collision, there is available no hose for gas distribution of air bags for side collision where breakage near the inlet of inflator is prevented, receiving property is good and cost is advantageous.

DE-A-198 59 539 discloses a hose for introduction and distribution of inflator gas, wherein the hose is placed in an air bag apparatus for side collision and distributes the inflator gas upon operation of the air bag.

The present invention has been created in view of the above-mentioned current state in the prior art as such and its object is to provide a hose for introduction and distribution of inflator gas being able to be used for an air bag apparatus for side collision where the receiving property of the air bag for side collision is improved, the receiving space is reduced, breakage near the inlet of inflator is prevented and the cost is advantageous.

The present invention is a hose for introduction and distribution of inflator gas which is characterized in that the hose is placed in an air bag apparatus for side collision and distributes the inflator gas upon operation of the air bag, that outside surface and/or inside surface of the hose are/is coated with rubber or synthetic resin and that the hose has a distribution hole.

Preferred embodiments of the hose of the present invention will be apparent from the dependent claims.

As to the fiber constituting the hose of the present invention and the air bag which is connected to the hose, there may be used polyamide fiber, polyester fiber, etc. although the present invention is not limited thereto. Strength of the yarn is not less than 6 g/dtex, preferably not less than 7 g/dtex or, more preferably, not less than 7.5 g/dtex.

The hose of the present invention can be prepared using a cylindrical weaving machine used for weaving a fire hose and the like. When a cylindrical weaving machine is used, there is no necessity of conducting a process for making a cylinder whereby the processing cost such as sewing can be reduced. In addition, it is not necessary to take the breakage from the sewed part into consideration and the reliability is increased.

It is necessary that at least one side of the hose of the present invention is coated with rubber or with synthetic resin. Examples of the rubber to be coated are neoprene rubber, ethylene propylene diene rubber and silicone rubber. Examples of the silicone rubber are thermosetting addition polymerization silicone rubber and RTV silicone rubber of a two-liquid type although they are non-limitative. The silicone rubber may use silane coupling agent of an amino type, epoxy-modified silane coupling agent, silane coupling agent of a vinyl type, silicone coupling agent of a chlorine type, etc. for improving the adhesive property. As a result of improving the adhesive property, it is possible to increase the slip-off resistance. With regard to the synthetic resin, there may be used polyester, polyamide, elastomer of a polyester type, elastomer of a polyamide type, elastomer of a polyurethane type, etc. although they are non-limitative.

The hose of the present invention may have a distribution hole in any shape or any size and it is preferred that the distribution hole is substantially square or rectangular where each side is located substantially parallel to or in a right angle to warp or woof constituting the hose. Distribution hole in a circular shape is inferior to that in a square or rectangular shape in terms of the preference. That is because, when the shape of the distribution hole is circular, easily unraveled parts are formed at the area where ends of warp and woof are crossed, resistance to gas flow at that area upon development of the air bag become big and the possibility of unusual breakage becomes high. Side length or diameter of the distribution hole is preferably 5-40 mm or, more preferably, 10-30 mm. When it is more than 40 mm, flow rate of the inflator gas becomes high and local heating is generated whereby breakage is resulted from such a part and that is not preferred. When it is less than 5 mm, many distribution holes are to be formed whereby the processing cost is needed and that is not preferred. Although it is not necessary to particularly process the surrounding of the distribution hole, such a part may be fused by heat or may be sewed.

The slip-off resistance of the warp and the woof of the hose of the present invention is not less than 10 N, preferably not less than 15 N and, particularly preferably, not less than 20 N. When the slip-off resistance is less than 10 N, unusual deformation of the hose occurs near the distribution hole due to the inflator gas or the distribution hole becomes large by such a deformation whereby the distributing ratio is unable to be controlled and that is not preferred. When the distribution hole becomes large, the air bag for side collision may burst during the initial stage of its development and that is not preferred. Slip-off resistance is able to be adjusted by the control of amount of the coat, amount of the additive or fineness of warp and woof constituting the hose.

Diameter of the hose is preferably 20-60 mm or, preferably, 30-50 mm. When the hose diameter is less than 20 mm, breakage is apt to occur while, when it is more than 60 mm, the hose is hardly received in the air bag for side collision and that is not preferred.

Crimp of the woof constituting the hose is preferably smaller than that of the warp. The woof is apt to be affected by tension and, in order to make the influence of heat as little as possible, the part which comes out of the surface is to be made small. Accordingly, it is better that there is no crimp in the woof and the state of being covered by the warp is better.

Fineness of the yarn constituting the main body of the air bag for side collision is preferably 200-600 dtex or, more preferably, 300-500 dtex. When the fineness is more than 600 dtex, its receiving property becomes a problem. When it is less than 200 dtex, strength of the substrate cloth is insufficient resulting in a high possibility of burst even if distribution of the inflator gas is controlled and that is not preferred. Fineness of single yarn of the multifilament constituting the main body of the air bag for side collision is preferably 2-10 dtex or, more preferably, 3-6 dtex. When the single yarn fineness is more than 10 dtex, rigidity of the substrate cloth becomes high and receiving property lowers. When it is less than 2 dtex, snapping of the single yarn or the like happens upon weaving whereby many disadvantages of the substrate cloth are resulted and that is not preferred.

Fineness of one multifilament of warp constituting the hose is not less than two-fold or, preferably, not less than three-fold, of fineness of one multifilament constituting the main body of the air bag for side collision. When the fineness of warp of the hose is less than two-fold, the hose is apt to cause poor distribution by cutting-off of the warp in the distribution of the inflator gas and that is not preferred.

Fineness of one multifilament of woof constituting the hose is not less than three-fold or, preferably, not less than five-fold, of fineness of one multifilament constituting the main body of the air bag for side collision. When the fineness of one multifilament of woof constituting the hose is less than three-fold, the hose is apt to cause poor distribution by cutting-off of the woof and that is not preferred.

Examples

The present invention will now be illustrated in more detail by the following Examples. Measurements in the Examples are carried out in accordance with the following measuring methods.

Slip-off resistance: Conducted according to "Method A; method for pulling out the yarn; resistance to sliding-off" of JIS L1096.

Distribution test: Into a test connecting tube where one side was closed by sewing was introduced nitrogen gas compressed to an initial pressure of 800 kPa to an extent of volume of 5 liters from another inlet which was not sewed and then the state of the distribution hole was observed. The test connecting tube was made in 2 m and five distribution holes having predetermined shape and size were set up every 30 cm from the inlet.

With regard to the result of the evaluation, there was observed the state of the distribution hole by deformation of warp and woof at the nearest distribution hole from the nitrogen gas inlet in the hose after the test.

Shape of the observed distribution hole was evaluated according to the five stages of A to D.

  1. A: deformation of the shape was hardly noted
  2. B: deformation of the shape was noted very little
  3. C: deformation of the shape was noted a little
  4. D: deformation of the shape was noted considerably
  5. E: deformation of the shape was noted significantly

Examples 1~9 and Comparative Example 1

A tube was woven on cylindrical weaving machine using a polyamide 66 fiber having strength of 8.0 g/dtex, then a coating agent was uniformly applied thereon and setting was carried out at 140°C for 5 minutes to prepare a hose for introduction and distribution of inflator gas. Results of the Examples and the Comparative Example of the hose for distribution of inflator gas manufactured as such are shown in Table 1. Table 1 Ex 1 Ex 2 Ex 3 Ex 4 Ex 5 Ex 6 Ex 7 Ex 8 Ex 9 CE 1 Tube Material of Warp Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Material of Woof Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Ny66 Fineness of Warp (dtex) 1500 1500 1050 2350 2350 2350 1410 1500 1500 1500 Fineness of Woof (dtex) 3500 3500 1750 4700 4700 4700 2350 3500 3500 3500 Density of Tube Warps (nos. per inch) 37 37 40 29 29 29 37 37 37 37 Woofs (nos. per inch) 12 12 17 10 10 10 14 12 12 12 Coating Agent Amt of coating agent (g/m2) 150 150 150 150 150 150 150 50 150 0 Type S1 S1 S1 S1 S1 S1 S1 S1 S1 - Type of Additive A A A A A A A A A - Amt of Additive (parts by wt) 2 2 2 2 2 2 2 1 0 - Coated Side Os os os os os os os os os - Shape of Distribution Hole Sq cir sq sq rec cir sq aq sq sq Size of Distribution Hole (mm) 10 x 10 10 10x10 10x10 10 x20 20 10x10 10 x10 10 x10 10 x10 Slip-off resistance Warp (N) 37 37 29 65 65 65 34 15 25 3 Woof (N) 30 30 25 50 50 50 26 8 14 0.6 Evaluation of Distribution Hole A C B A A C A D D E Coating agent S1: Elastosil M-4540 manufactured by Wacker (thermosetting addition-polymerized silicone rubber)

Additive A: Adhesion Promotor HF86 manufactured by Wacker (epoxy-modified silane coupling agent)

CE: Comparative Example

os: outside

sq: square

cir: circular

rec: rectangular

Considerations

From the results of evaluation for Examples 1 and 2 versus 4 and Examples 5 versus 6 in Table 1, it is noted that, with regard to the shape of the distribution hole, deformation of the distribution hole is rarer in the case of square or rectangle (Examples 1, 4 and 5) than in the case of circle (Examples 2 and 6).

From Example 1 and Example 3, it is noted that, when fineness of warp and woof is made large (Example 1), slip-off resistance becomes high and distribution hole is hardly deformed.

From the result of Example 7 and Example 8, it is noted that coating amount is proportional to slip-off resistance and that, when coating amount is high (Example 7), slip-off resistance is high and distribution hole is hardly deformed.

From the result of Example 7 and Example 9, it is noted that, when an epoxy-modified silane coupling agent is added as an auxiliary adhesive, slip-off resistance is improved (Example 7) and distribution hole is hardly deformed.

It is also noted from Table 1 that the distribution hoses of the inflator gas of the present invention (Examples 1-9) are hardly deformed in terms of the shape of the distribution hole as compared with the inflator gas distribution hoses of Comparative Example 1 which is not coated with a coating agent and accordingly that they are suitable as distribution hoses.

As fully illustrated hereinabove, in the distribution hose for inflator gas according to the present invention, breakage near the inlet of the inflator is prevented and gas is homogeneously distributed whereby it is now possible to provide a method for distribution of air bag for side collision having good developing property, having good receiving property and being advantageous in terms of cost.


Anspruch[de]
Schlauch zur Zufuhr und Verteilung von Aufblasgas, welcher in einer Airbag-Vorrichtung für seitlichen Aufprall angeordnet ist und das Aufblasgas bei Betrieb des Airbags verteilt, welcher dadurch gekennzeichnet ist, dass die äußere Oberfläche und/oder innere Oberfläche des Schlauches mit Kautschuk oder synthetischem Harz beschichtet sind/ist und dass der Schlauch eine Verteilungsöffnung aufweist, wobei der Abrutschwiderstand von Kette und Schuss, welche den Schlauch bilden, nicht weniger als 10 N beträgt, wobei die Feinheit von einem Multifilament der Kette, welche den Schlauch bildet, in einem solchen Verhältnis ist, dass sie nicht weniger als das Zweifache der Feinheit von einem Multifilament ist, welches den Hauptkörper des Airbags für seitlichen Aufprall bildet, und wobei die Feinheit von einem Multifilament des Schusses, welcher den Schlauch bildet, in einem solchen Verhältnis ist, dass sie nicht weniger als das Dreifache der Feinheit von einem Multifilament ist, welches den Hauptkörper des Airbags für seitlichen Aufprall bildet. Schlauch zur Zufuhr und Verteilung von Aufblasgas gemäß Anspruch 1, wobei der Abrutschwiderstand von Kette und Schuss, welche den Schlauch bilden, nicht weniger als 15 N beträgt. Schlauch zur Zufuhr und Verteilung von Aufblasgas gemäß Anspruch 1 oder 2, wobei der Durchmesser oder die Seitenlänge der Verteilungsöffnung von 5 bis 40 mm beträgt. Schlauch zur Zufuhr und Verteilung von Aufblasgas gemäß einem der Ansprüche 1 bis 3, wobei ein Schlauch verwendet wird, in welchem die Kräuselung des Schusses, welcher den Schlauch bildet, in einem solchen Verhältnis ist, dass sie kleiner als die Kräuselung der Kette, welche den Schlauch bildet, ist. Schlauch zur Zufuhr und Verteilung von Aufblasgas gemäß einem der Ansprüche 1 bis 4, wobei der Schuss des Schlauches im Wesentlichen durch die Kette bedeckt ist.
Anspruch[en]
A hose for introduction and distribution of inflator gas wherein the hose is placed in an air bag apparatus for side collision and distributes the inflator gas upon operation of the air bag, which is characterized in that the outside surface and/or inside surface of the hose are/is coated with rubber or synthetic resin and that the hose has a distribution hole wherein the slip-off resistance of warp and woof constituting the hose is not less than 10 N, wherein fineness of one multifilament of warp constituting the hose is in such a relationship that it is not less than two-fold the fineness of one multifilament constituting the main body of the air bag for side collision, and wherein fineness of one multifilament of woof constituting the hose is in such a relationship that it is not less than three-fold the fineness of one multifilament constituting the main body of the air bag for side collision. The hose for introduction and distribution of inflator gas according to claim 1, wherein the slip-off resistance of warp and woof constituting the hose is not less than 15 N. The hose for introduction and distribution of inflator gas according to claim 1 or 2, wherein diameter or side length of the distribution hole is from 5 to 40 mm. The hose for introduction and distribution of inflator gas according to anyone of claims 1 to 3, wherein there is used a hose in which the crimp of woof constituting the hose is in such a relationship that it is smaller than the crimp of warp constituting the hose. The hose for introduction and distribution of inflator gas according to anyone of claims 1 to 4, wherein the woof of the hose is substantially covered by the warp.
Anspruch[fr]
Tuyau pour introduction et distribution de gaz de gonflage, le tuyau étant placé dans un dispositif à coussin gonflable de sécurité pour collision latérale et distribuant le gaz de gonflage lors de l'actionnement du coussin de sécurité, caractérisé en ce que la surface extérieure et/ou la surface intérieure du tuyau sont revêtues de caoutchouc ou de résine synthétique, et en ce que le tuyau comporte un orifice de distribution, dans lequel la résistance au glissement de la chaîne et de la trame constituant le tuyau n'est pas inférieure à 10 N, dans lequel la finesse d'un multifilament de chaîne constituant le tuyau est telle qu'elle n'est pas inférieure à deux fois la finesse d'un multifilament constituant le corps principal du coussin de sécurité pour collision latérale, et dans lequel la finesse d'un multifilament de trame constituant le tuyau est telle qu'elle n'est pas inférieure à trois fois la finesse d'un multifilament constituant le corps principal du coussin de sécurité pour collision latérale. Tuyau pour introduction et distribution de gaz de gonflage selon la revendication 1, dans lequel la résistance au glissement de la chaîne et de la trame constituant le tuyau n'est pas inférieure à 15 N. Tuyau pour introduction et distribution de gaz de gonflage selon la revendication 1 ou 2, dans lequel le diamètre ou la longueur latérale de l'orifice de distribution est compris entre 5 et 40 mm. Tuyau pour introduction et distribution de gaz de gonflage selon l'une quelconque des revendications 1 à 3, dans lequel est utilisé un tuyau dans lequel la frisure de la trame constituant le tuyau est telle qu'elle est plus petite que la frisure de la chaîne constituant le tuyau. Tuyau pour introduction et distribution de gaz de gonflage selon l'une quelconque des revendications 1 à 4, dans lequel la trame du tuyau est sensiblement recouverte par la chaîne.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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