JPWO2011043167A1 - Curtain airbag structure for vehicles - Google Patents

Abstract

The present invention provides a curtain airbag structure for a vehicle having a structure capable of avoiding damage caused by a high-pressure and high-temperature inflator gas and having a gas guide capable of smoothly guiding the inflator gas. A gas guide having an inflator insertion cylinder part and a gas ejection cylinder part for ejecting inflator gas integrally includes a central part and a pair of wing parts on both sides of the central part. The central portion forms a gas jetting cylinder portion by the first folding FL1 of the central portion facing each other, and the wing portion is the second folding FL2 of one wing portion and the other wing The overlap part 11 overlapped with the part and the contact part 12 where the wing parts face each other and overlap are formed, and the periphery extending from the overlap part to the contact part except for the second folding is left with the entrance. The cylindrical part for insertion is formed by joining. [Selection] Figure 7

Description

  The present invention relates to a vehicle curtain airbag structure having a structure capable of avoiding damage caused by a high-pressure and high-temperature inflator gas and having a gas guide capable of smoothly guiding the inflator gas.

  Patent Document 1 discloses a technique in which a gas guide is provided in an inflator mounting cylinder portion of a curtain airbag and gas generated by the inflator is guided to a gas duct by the gas guide.

  Patent document 1 provides the head protection airbag which can be manufactured easily even if it is the structure which arrange | positions an inner tube in the connection port part of an airbag main body. The head protection airbag includes an airbag body and an inner tube. The airbag body includes a deployment inflating portion that is deployed and inflated so as to cover the inside of the side window of the vehicle, and a cylindrical connection port portion that is connected to the inflator so that inflation gas can flow into the deployment inflating portion. Prepare. An inner tube is arrange | positioned between the internal peripheral surface of a connection port part, and the outer peripheral surface of an inflator, and guides expansion | swelling gas to an expansion | deployment expansion part. The vicinity of the connection port portion of the airbag body is constituted by a sewing bag portion. The inner tube is disposed between the vehicle inner seat and the vehicle outer seat when the sewing bag portion is formed, and is sewn together at the time of sewing the partition stitching portion located at the outer peripheral edge of the connection port portion, and is connected to the connection port portion. It is attached and arranged.

JP 2009-035552 A

  The inner tube and the gas guide are formed into a tube shape by sewing. When the inflator is in operation, the inner tube and the like are filled with high-pressure and high-temperature inflator gas and swell at once. When the inner tube or the like expands, the pressure of the inflator gas generates a force that separates the sewing portion, and at the same time, the sewing portion is exposed to the high heat of the inflator gas.

  In particular, a sewn portion such as an inner tube (for example, a sewn portion of an upper edge portion such as an inner tube) facing the gas ejection portion of the inflator is easily affected by the inflator gas. The sewn portion could not withstand the pressure of the inflator gas and high heat, and could be damaged by burning.

  If the sewn portion is damaged and the inner tube or the like is damaged, the inflator gas cannot be smoothly guided to the gas duct. As a result, there has been a problem that it is impossible to ensure the proper deployment and inflating action of the curtain airbag, and it is impossible to ensure proper occupant protection performance.

  The present invention was devised in view of the above-described conventional problems, and has a structure capable of avoiding damage caused by a high-pressure and high-temperature inflator gas, and a gas capable of smoothly guiding the inflator gas. An object is to provide a curtain airbag structure for a vehicle provided with a guide.

  A curtain airbag structure for a vehicle according to the present invention includes: an inflator that generates inflator gas; a mounting cylinder portion that mounts the inflator; and a gas airbag that communicates the mounting cylinder portion with a chamber; A gas guide for introducing inflator gas into the gas duct; the gas guide is located in the mounting cylinder, and an insertion cylinder in which an inlet for inserting the inflator is formed; and the gas guide is positioned in the gas duct. The gas guide includes a central portion and a pair of wing portions located on both sides of the central portion; and the central portion includes: The gas blowing cylinder is formed by first folding of the central portion where the wings face each other; the wings facing each other A second folding of the wing portion overlaps the other wing portion to form an overlap portion that can be brought into close contact with an inflator gas pressure, and a contact portion where the wing portions face each other and overlap each other. The cylindrical portion for insertion is formed by joining the periphery from the overlap portion excluding the folding of the contact portion to the contact portion, leaving the entrance.

  The overlap portion has a third wing portion corresponding to the second turn of the one wing portion so that a pair of the wing portions are overlapped at the second turn-back position. Is preferably formed.

  In order to reinforce the gas ejection cylinder part, it is desirable that the central part has an extended part that is overlapped and joined to the central part by folding.

  The gas guide may be provided with a reinforcing panel superimposed on one surface.

  The reinforcing panel preferably has a covering portion that covers the wing portion in the vicinity of the inlet in order to reinforce the inlet of the cylindrical portion for insertion.

  The reinforcing panel preferably has a slit corresponding to the first turn-back position in order to allow swelling of the gas jetting cylinder portion due to inflator gas pressure.

  In the vehicle curtain airbag structure according to the present invention, damage to the gas guide due to the high-pressure and high-temperature inflator gas can be avoided, and the inflator gas can be smoothly guided through the gas guide.

It is a front view which shows the expansion | deployment state of the curtain airbag by which the curtain airbag structure for vehicles which concerns on this invention is employ | adopted. It is the D section enlarged view in the state where the gas guide was inserted in FIG. It is explanatory drawing which shows the condition which inserts an inflator in the gas guide shown in FIG. It is a principal part enlarged view which shows the state which fixed the inflator shown in FIG. 3 to the curtain airbag. It is a side view of the gas guide integrated in the curtain air bag structure for vehicles concerning the present invention. FIG. 6 is a development view of the gas guide shown in FIG. 5. It is front sectional drawing which shows an example when the gas guide shown in FIG. 5 is folded. It is front sectional drawing which shows the other example when the gas guide shown in FIG. 5 is folded. It is an expanded view which shows an example of the reinforcement cloth which can be combined with the gas guide shown in FIG. It is explanatory drawing explaining the procedure which produces a gas guide combining the reinforcement cloth shown in FIG. In FIG. 5, it is an AA arrow directional cross-sectional view. In FIG. 5, it is a BB arrow directional cross-sectional view. In FIG. 5, it is CC sectional view taken on the line.

  Hereinafter, preferred embodiments of a curtain airbag structure for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 show a structure in which an inflator 2 is attached to a curtain airbag 1 that is deployed and inflated.

  In the deployed state, the curtain airbag 1 is provided with a gas duct 3 at the top and a plurality of chambers 4 arranged at the bottom. The gas duct 3 communicates with these chambers 4. At the upper edge of the curtain airbag 1, a lateral opening 5 a is formed at one end, the other end communicates with the gas duct 3, and a mounting cylinder 5 to which the inflator 2 is mounted from the opening 5 a is formed. . The mounting cylinder 5 is communicated with the chamber 4 through the gas duct 3.

  The curtain airbag 1 is provided with a gas guide 6 that introduces inflator gas into the gas duct 3 from the mounting cylinder 5 to the gas duct 3. The gas guide 6 is formed of a hollow structure with a cloth material. As a material of the gas guide 6, in addition to a cloth material, a synthetic resin, a metal, a base cloth used for an airbag, or the like may be used. The gas guide 6 integrally includes an insertion cylinder portion 7 and a gas ejection cylinder portion 8 that communicate with each other. The insertion cylinder part 7 is located in the mounting cylinder part 5, and the gas ejection cylinder part 8 is located in the gas duct 3. The insertion cylinder portion 7 is bent in an L shape from the mounting cylinder portion 5 toward the gas duct 3. The downward portion of the L-shaped insertion cylinder portion 7 communicates with the gas ejection cylinder portion 8, and the lateral portion is opened outward from the opening 5 a of the mounting cylinder portion 5. The open end of the lateral portion serves as an inlet 7 a for inserting the inflator 2 into the gas guide 6.

  The gas guide 6 is entirely folded by the flexibility of the cloth material, and is inserted into the curtain airbag 1 from the opening 5a of the mounting cylinder 5, and after the insertion, the insertion cylinder 7 is inserted into the mounting cylinder 5. The gas ejection cylinder 8 is expanded in the gas duct 3.

  The inflator 2 that generates inflator gas is inserted from the inlet 7 a of the insertion cylinder 7, and the gas ejection portion 2 a of the inflator 2 is accommodated inside the insertion cylinder 7. A ring 9 that surrounds the inflator 2 housed inside the insertion cylinder 7 and is fixed to the curtain airbag 1 is attached to the installation cylinder 5.

  FIG. 5 shows a gas guide 6 applied to the vehicle curtain airbag structure according to this embodiment. The gas guide 6 may be provided with a reinforcing cloth 10 as a reinforcing panel as described later. First, the form of the gas guide 6 alone will be described.

  FIG. 6 shows a state where the gas guide 6 alone is developed. The gas guide 6 includes a central portion 6a and a pair of wing portions 6b and 6c located on both sides of the central portion 6a (upper and lower sides in the illustrated example). A first turn FL1 is set in the center portion 6a so that the upper and lower wing portions 6b and 6c face each other. A second turn FL2 is set in the lower wing portion 6c.

  As shown in FIGS. 5 to 7, the wing portions 6b and 6c face each other with the first folding FL1 position down by the first folding FL1 of the central portion 6a. As a result, it is possible to form the gas ejection cylinder portion 8 that communicates laterally along the gas duct 3 in the central portion 6 a located at the lower portion of the gas guide 6.

  With the pair of wing portions 6b, 6c facing each other, the lower wing portion 6c sandwiches the upper portion of the upper wing portion 6b by the second folding FL2 of one wing portion (lower wing portion in the figure) 6c, The lower wing portion 6c is overlapped with the upper wing portion 6b. As a result, the second folded FL2 position becomes the upper edge of the gas guide 6, and the overlap portion 11 is formed on the upper portion of the gas guide 6. A contact portion 12 is formed below the overlap portion 11 so as to be positioned approximately at the center in the vertical direction of the gas guide 6 so that the wing portions 6b and 6c face each other and overlap each other.

  The overlap portion 11 corresponds to the lateral portion of the L-shaped insertion cylinder portion 7, and the contact portion 12 corresponds to the downward portion. The wings 6b and 6c that face each other are joined together by sewing or the like at the periphery from the overlap portion 11 to the contact portion 12 except for the position of the second folded FL2 that is the upper end edge of the gas guide 6, leaving the inlet 7a. The By this joining, an insertion cylindrical portion 7 having an L-shaped hollow structure that can insert the inflator 2 from the inlet 7a is formed. At the same time, a gas ejection cylinder portion 8 having both end portions 8a opened toward the gas duct 3 is formed in the central portion 6a.

  FIG. 7 shows a state in which the gas guide 6 is swollen by the inflator gas pressure. In the overlap portion 11 immediately below the second folding position FL2, the gas guide 6 has an upper wing portion 6b on the inner side and a lower wing portion 6c on the outer side overlapping each other. When the inflator gas is filled inside the gas guide 6, the upper wing portion 6b is pushed toward the lower wing portion 6c by the gas pressure in the overlap portion 11, and the two can be in close contact with each other. Thereby, leakage of the inflator gas from the gas guide 6 is prevented. Moreover, since the upper end edge of the gas guide 6 is not joined by sewing or the like, damage due to high-temperature inflator gas can be avoided.

  FIG. 7 shows a case where the upper wing 6b is flattened without being folded back. Instead, FIG. 8 relates to the case where the third folding FL3 is set in the upper wing portion 6b (see FIG. 6). The third fold FL3 is formed corresponding to the second fold FL2. Specifically, when the center portion 6a is folded back by the first folding FL1, the third folding FL3 of the upper wing portion 6b is located at a position substantially coincident with the second folding FL2 position of the lower wing portion 6c. Is set. In this case, the upper wing portion 6b is formed larger than the case of FIG. 7 so as to exceed the position of the second folding FL2. As a result, in the overlap portion 11, the pair of wing portions 6 b and 6 c are overlapped at the second turn-up FL 2 position which is the upper end edge of the gas guide 6. The upper end edge of the gas guide 6 is overlapped with the upper and lower wing portions 6b and 6c, and the contact action between the wing portions 6b and 6c when the gas guide 6 is expanded by the inflator gas pressure is enhanced. Accordingly, the inflator gas leakage preventing action is improved and the damage preventing action is also improved.

  Further, as shown in FIG. 6, an extended portion 6d that is overlapped with the central portion 6a is integrally formed in the central portion 6a by folding FL4. The extended portion 6d is overlapped and joined to the central portion 6a before the wing portions 6b and 6c are overlapped with each other in the first turn FL1. Thereby, the overlapping number of the central portions 6a is increased, and the gas ejection cylinder portion 8 is reinforced.

  5 and 9 to 13 show a case where a reinforcing cloth 10 is provided as a reinforcing panel on the gas guide 6 so as to overlap with each other. The material of the reinforcing panel may be a synthetic resin, a metal, a base fabric used for an airbag, etc. in addition to a cloth material. As shown in FIG. 9, the reinforcing cloth 10 integrally includes a central piece 6a and upper and lower wing pieces 10b, 10c corresponding to the central part 6a of the gas guide 6 and the upper and lower wing parts 6b, 6c. The central piece 10 a of the reinforcing cloth 10 does not have an expanded portion and is formed to be narrower than the central portion 6 a of the gas guide 6. The upper wing piece 10b of the reinforcing cloth 10 is less protruding and is formed to be narrower than the upper wing 6b of the gas guide 6. The reinforcing cloth 10 has a cover portion 10d in which the lower wing piece portion 10c protrudes more than the lower wing portion 6c. In the reinforcing cloth 10, a slit 13 having an appropriate length is formed in the length direction of the gas ejection cylinder portion 8 along the gas duct 3 corresponding to the position of the first turn FL1 of the gas guide 6.

  FIG. 10 shows a procedure for creating the gas guide 6. As shown in FIG. 10 (1), the reinforcing cloth 10 is superimposed on one surface of the gas guide 6. Next, as shown in FIG. 10B, the gas guide 6 and the reinforcing cloth 10 are also joined by sewing or the like. Further, the extended portion 6d of the gas guide 6 is folded back by the folding FL4 so as to overlap the central piece portion 10a of the reinforcing cloth 10, and is joined by sewing or the like.

  Next, as shown in FIG. 10 (3), the inner folded portion is formed on the upper edge of the gas guide 6 together with the reinforcing fabric 10 by the third folding FL3 (see the case of FIG. 8). Next, as shown in FIG. 10 (4), the wings 6b and 6c are faced to each other together with the reinforcing cloth 10 by the first folding FL1.

  Thereafter, as shown in FIG. 5, the upper portion of the lower wing portion 6c is folded and overlapped so as to cover the inner folded portion formed in FIG. 10 (3) by the second folding FL2. Part 11 is formed. A contact portion 12 is formed below the overlap portion 11.

  Finally, as shown in FIG. 5, the periphery from the overlap portion 11 to the contact portion 12 excluding the second folding FL2, which is the upper edge of the gas guide 6, is joined by sewing or the like, leaving the inlet 7a. To do. As a result of this joining, an insertion tube portion 7 having an L-shaped hollow structure capable of inserting the inflator 2 from the inlet 7a is formed. At the same time, both end portions 8a are formed in the central portion 6a toward the gas duct 3. An open gas ejection cylinder portion 8 is formed.

  As shown in FIG. 11, the gas guide 6 on which the reinforcing cloth 10 is overlapped has a double structure in which the reinforcing cloth 10 is provided around the gas guide 6 alone shown in FIG. 8. The slit 13 of the reinforcing cloth 10 is positioned at the first turn FL1, and is opened at the gas pressure so as to allow the gas ejection cylinder portion 8 to bulge due to the inflator gas pressure.

  Moreover, as shown in FIG. 12, the inlet 7a of the cylinder part 7 for insertion is formed in the center of the overlap part 11 used as a multilayer. When folded by the second folding FL2, the covering portion 10d of the lower wing piece portion 10c of the reinforcing cloth 10 is covered around the wing portions 6b and 6c in the vicinity of the inlet 7a of the insertion cylinder portion 7, and the inflator 2 is inserted. The inlet 7a of the insertion cylinder 7 is reinforced.

  Further, as shown in FIG. 13, the periphery of both end portions 8a of the gas ejection cylinder portion 8 is the expanded portion 6d, the central portion 6a, and the reinforcing cloth 10 due to the folding FL4 of the expanded portion 6d described in FIG. The central piece 10a has a three-layer structure and reinforces the gas ejection cylinder 8.

  Next, the effect | action of the curtain airbag structure for vehicles which concerns on this embodiment is demonstrated. When the inflator 2 is activated, inflator gas is generated from the gas ejection portion 2a. The inflator gas fills the insertion cylinder 7 of the gas guide 6 provided from the installation cylinder 5 of the curtain airbag 1 to the gas duct 3. The gas filled in the insertion cylinder portion 7 flows into the gas ejection cylinder portion 8 and is ejected from the gas ejection cylinder portion 8 into the gas duct 3. The inflator gas ejected to the gas duct 3 is guided to the gas duct 3 and flows into each chamber 4. Thereby, the curtain airbag 1 is expanded and inflated.

  By the way, in the curtain airbag structure for a vehicle according to the present embodiment, the upper end edge of the gas guide 6 facing the gas ejection portion 2a of the inflator 2 is folded (second and third folded) without being joined by sewing or the like. Since it is formed of FL2, FL3), it is possible to avoid damage caused by high pressure and high heat inflator gas. Specifically, in the overlap portion 11 formed by the turn-backs FL2 and FL3, the wing portions 6b and 6c are brought into close contact with each other by the gas pressure, and leakage of the inflator gas from the gas guide 6 can be prevented. Moreover, since it is not joined by sewing or the like, damage due to high-temperature inflator gas can be avoided. Thus, leakage of the inflator gas and damage to the gas guide 6 can be prevented, so that the inflator gas can be smoothly guided to the gas duct 3 and an appropriate expansion and expansion action of the curtain airbag 1 can be ensured. Proper occupant protection performance can be guaranteed.

  Further, since a joining portion such as sewing is not formed at the upper end edge of the gas guide 6, the cost required for joining can be reduced, and the workability of inserting the gas guide 6 into the mounting cylinder 5 can be improved.

  By setting the third turn-up FL3 and overlapping the second turn-up FL2, the upper end edge of the gas guide 6 can be formed into a multilayer structure, and the performance of preventing gas leakage and preventing burnout can be improved. By forming the extended portion 6d and superimposing it on the central portion 6a, the gas ejection cylinder portion 8 can be reinforced.

  By providing the reinforcing cloth 10 on the gas guide 6 in an overlapping manner, a multilayer structure can be obtained and the performance can be improved.

  By providing the cover cloth 10d on the reinforcing cloth 10, the inlet 7a of the insertion cylinder 7 can be reinforced, and the performance can be improved. By forming the slit 13 in the reinforcing cloth 10 so as to correspond to the position of the first folding FL1, it is possible to allow the gas ejection cylinder portion 8 to bulge due to the inflator gas pressure, and to smoothly supply the inflator gas to the gas duct 3. The deployment and inflation performance of the curtain airbag 1 can be improved.

  The vehicle curtain airbag structure described above is a preferred example of the present invention, and other embodiments can be implemented or performed by various methods. In particular, the present invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise stated in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

DESCRIPTION OF SYMBOLS 1 Curtain airbag 2 Inflator 3 Gas duct 4 Chamber 5 Installation cylinder part 6 Gas guide 6a Center part 6b, 6c A pair of wing parts 6d Expansion part 7 Insertion cylinder part 7a Inlet 8 Gas ejection cylinder part 10 Reinforcement cloth 10d Cover part 11 Overlap portion 12 Contact portion 13 Slit FL1 First turn FL2 Second turn FL3 Third turn

Claims (6)

An inflator that generates inflator gas;
A curtain airbag having a mounting cylinder for mounting the inflator, and a gas duct communicating the mounting cylinder with the chamber;
A gas guide for introducing inflator gas into the gas duct,
The gas guide is located in the mounting cylinder and has an insertion cylinder in which an inlet for inserting the inflator is formed, and a gas ejection cylinder that is located in the gas duct and ejects the inflator gas to the gas duct. And integrally
The gas guide includes a central portion and a pair of wing portions located on both sides of the central portion,
The central part is
By the first turn of the central portion that faces the wing portions, the cylindrical portion for gas ejection is formed,
The wings facing each other
Overlapping with the second wing part of one of the wing parts to overlap the other wing part, forming an overlap part that can be intimately contacted by inflator gas pressure, and a contact part where the wing parts face each other and overlap, A vehicular curtain airbag characterized in that the cylindrical portion for insertion is formed by joining the periphery from the overlap portion excluding the second turn back to the contact portion, leaving the entrance. Construction.   The overlap portion has a third wing portion corresponding to the second turn of the one wing portion so that a pair of the wing portions are overlapped at the second turn-back position. The curtain airbag structure for a vehicle according to claim 1, wherein the folding is formed.   The curtain air for a vehicle according to claim 1 or 2, wherein the central portion has an extended portion that is overlapped and joined to the central portion by folding in order to reinforce the cylindrical portion for gas ejection. Bag structure.   The vehicular curtain airbag structure according to any one of claims 1 to 3, wherein the gas guide is provided with a reinforcing panel superimposed on one surface.   5. The vehicle curtain airbag structure according to claim 4, wherein the reinforcing panel has a covering portion that covers the wing portion in the vicinity of the inlet in order to reinforce the inlet of the insertion cylinder portion. .   The said reinforcement panel has a slit corresponding to this 1st folding | turning position, in order to allow the expansion | swelling of this cylinder part for gas ejection by inflator gas pressure, It is characterized by the above-mentioned. Curtain airbag structure for vehicles.

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