WO2007058211A1 - Head protecting air bag device - Google Patents

Abstract

[PROBLEMS] A protruding portion will not burst when an inflator operates even if an air bag is installed by being allowed to protrude toward the inside of a car. [MEANS OF SOLVING PROBLEMS] A head protecting air bag device comprising an inflator (12), and an air bag (13) that is mounted so as to run over the stepped portion of a roof side rail, and has a folding portion (13f) provided adjacent to a first side surface (13e) and expanded and deployed between the occupant's head and the inner side surface of the car when high-pressure gas jetting out from the inflator (12) is supplied via a duct (13b) surrounded by an upper sewn line and a lower boundary line Lb, and a rolling portion (13c) disposed above a second side surface (13d) on the side opposite to this folding portion (13f). The vertical-direction width d1 of the duct (13b) at a portion corresponding to the stepped portion in the middle of the air bag (13) being deployed is larger than the vertical-direction width d2 of the other portions of the duct. [EFFECT] A rise in inner pressure on the downstream side in the duct or inside a chamber is controlled to thereby prevent air bag bursting.

Description

 Air bag device for head protection

 Technical field

 [0001] The present invention provides head protection that protects a passenger's head by deploying a plurality of chambers in a curtain shape, for example, when a heavy load is applied in the direction of the side of the vehicle body, such as when the vehicle rolls over. The present invention relates to an airbag device.

 Background art

 [0002] A head protection airbag device that inflates and deploys a plurality of chambers in a curtain shape along a side door glass when a high load is applied in a lateral direction of a vehicle body is installed in an automobile. It is coming. By installing this head protection airbag device, it is possible to effectively protect the head of an occupant seated on the seat even when a heavy load is applied in the lateral direction of the vehicle body.

 [0003] By the way, the airbag device for head protection is attached with a plurality of tabs along the roof side rail from the front pillar (A pillar) force center pillar (B pillar) to the rear pillar (C pillar). Being

 Patent Document 1: Japanese Special Table 2002- 503581

 [0004] On the other hand, from the viewpoint of improving the in-vehicle strength against a side collision, there is a case where the B pillar is large and the B pillar 1 protrudes into the vehicle interior as shown in FIG. In such a case, the head protection airbag device 11 installed along the roof side rail 4 via the tab 5 is in a state of projecting to the vehicle interior side at the first part of the B pillar as shown in Fig. 4 (b). Installed at. In addition, 2 in FIG. 4 indicates A-bill and 3 indicates C-biller.

 Disclosure of the invention

 Problems to be solved by the invention

[0005] When the airbag is installed in a state of overhanging the vehicle interior side, during operation, a high-pressure gas flow ejected from the inflator has a force in the vehicle interior direction on the deployed airbag downstream of the overhang portion. It has been newly found that the phenomenon of working and airbags rolling up occurs. In FIG. 4 (b), the high-pressure gas flow ejected from the inflator is indicated by white arrows. Indicate the direction of the passenger compartment acting on the deployed airbag with arrows! /

 [0006] Further, when the airbag is turned up, it is observed that the part becomes a gas puddle and the internal pressure rises abnormally. Under the most severe conditions, the part may burst. Was also divided. If the airbag ruptures, the passenger's head cannot be effectively protected.

[0007] It should be noted that the phenomenon described above has the first side surface 6a and the second side surface 6b shown in FIG. 5, and the fold portion 6c adjacent to the first side surface 6a is opposite to the fold portion 6c. This is particularly noticeable in the case of the airbag 6 having the flange 6d disposed on the second side surface 6b on the side.

[0008] The problem to be solved by the present invention is that when a conventional head protecting airbag device has a portion that protrudes toward the interior of the vehicle interior, the air located on the downstream side of the high-pressure gas flow of the protruding portion is the same. The point is that the noggs roll up and burst.

 Means for solving the problem

[0009] The airbag device for protecting a head of the present invention includes

 (1) an inflator,

 A roof side rail having a stepped portion protruding in a vehicle interior direction orthogonal to the longitudinal direction of the vehicle is mounted so as to get over the stepped portion, and a high-pressure inflator gas ejected from the inflator is supplied to an upper sewing line and a lower portion. A foldable part adjacent to the first side that is supplied via a duct surrounded by a boundary line and expands and expands between the occupant's head and the inner side of the passenger compartment, and on the opposite side of this foldable part A head protecting airbag device including an airbag having a collar portion disposed on a second side surface,

 In the middle of deployment of the airbag, the vertical width force of the duct corresponding to the step portion is made wider than the vertical width of other duct portions,

 Or

 (2) an inflator,

A high-pressure inflator gas that is also blown out by the inflation hawk is supplied through the outside surrounded by the upper sewing line and the lower boundary line, and is inflated and deployed between the head of the passenger and the inner side of the passenger compartment 1. A head protecting airbag device comprising an airbag having a fold portion adjacent to one side surface and a collar portion disposed on a second side surface opposite to the fold portion, The airbag has a gas guide connected to the duct into which inflator gas is introduced from substantially above the center portion with respect to the vehicle longitudinal direction length of all the chamber portions of the airbag,

 The inflator gas reaches the lower boundary line of the duct without hitting anywhere in the duct in the direction of gas ejection from the gas inlet, and the vertical width of the duct in the inflator gas direct reach area is the other duct. The main feature is that it is wider than the vertical width of the part.

 [0010] In the head protecting airbag device of the present invention having a powerful configuration, even if the airbag is installed in a state of projecting to the vehicle interior side, when the inflator is activated, the duct on the downstream side of the projecting portion or High-pressure gas can flow quickly into the chamber, and the internal pressure rise in the duct can be effectively suppressed. Therefore, the airbag of the overhanging portion does not rise up, and gas does not accumulate in the overhanging portion, so that it does not rupture.

 [0011] In the head protecting airbag device of the present invention, the "lower boundary line" refers to the top of the seam that separates each chamber and duct and forms an opening for introducing inflator gas. A smooth straight line or curved line that simply connects the parts.

 [0012] In the head protecting airbag device of the present invention having the configuration of (1), the step partial force and the inflator gas in the gas ejection direction do not hit anywhere in the duct, and the lower part of the duct This is the region where the inflator gas reaches the boundary line directly.

 [0013] In the head protecting airbag device of the present invention, the vertical width of the duct corresponding to the stepped portion or the inflator gas direct reaching region is wider than the vertical width of the other duct portions. For example, the lower boundary line of the duct to be widened may be configured to be lowered from other parts. In the present invention, “upper”, “lower” or a term including them is a term including “up” or “up” in a portion or direction located in the direction of the vehicle's ceiling relative to a certain part. The part or direction located in the vehicle floor direction relative to a certain part is expressed as a term including “down” or “down”.

 The invention's effect

[0014] The present invention is provided in a state where the airbag is projected to the vehicle interior side by a B pillar or the like. Even when the inflator is operated, the high-pressure gas quickly flows into the duct or chamber downstream of the overhanging portion, and the internal pressure rise in the duct can be effectively suppressed. Therefore, the airbag of the overhanging portion does not rise up, and gas does not accumulate in the overhanging portion, so that it does not rupture.

 Brief Description of Drawings

 FIG. 1 is a view of a deployed state of a head protecting airbag device of the present invention as viewed from the side of an automobile.

 FIG. 2 is a diagram illustrating a folded state of the airbag constituting the head protecting airbag device of the present invention.

 3 is a diagram showing the relationship between the internal pressure generated in the airbag at the measurement position shown in FIG. 1 and time.

 [FIG. 4] (a) is a diagram for explaining the installation state of the head protecting airbag device, and (b) is a diagram showing the vicinity of the B-bill with the upward force of the automobile enlarged.

 FIG. 5 is a schematic diagram for explaining an example of a folded state of the airbag.

 Explanation of symbols

[0016] 1 B pillar

 4 Norey Side Lenore

 11 Curtain airbag device

 12 Inflator

 13 Airbag

 13a chamber

 13b duct

 13c buttock

 13d Second side

 13e 1st side

 13f Folding part

 13g gas inlet

La Upper sewing line Lb Lower boundary line

 A Inflator gas direct reach area

 BEST MODE FOR CARRYING OUT THE INVENTION

 [0017] There is a case where the head protection airbag is installed in a state of overhanging the vehicle interior side. When the airbag is inflated and deployed, the gas from the inflator stays temporarily in the overhanging portion. As a result, only the overhanging portion suddenly becomes high pressure, and this airbag may burst.

 [0018] The present invention aims to prevent this burst and effectively increases the internal pressure in the duct by rapidly flowing the high-pressure gas of the inflation tank into the duct or chamber downstream of the overhang. This is realized by suppressing to the above.

 Example

 Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 and 2.

 As shown in FIG. 1, the head protecting airbag device 11 of the present invention has an inflator 12 and an air bag 13 inflated and deployed by a high-pressure inflator gas ejected from the inflator 12.

[0020] The inflator 12 is installed, for example, on a roof side rail portion of a passenger compartment. When a high load exceeding a predetermined value acting on the side part of the vehicle body, such as a side collision, is detected by a sensor (not shown) installed near the lower end of the B pillar, Spout gas.

 [0021] In addition, the airbag 13 has a plurality of chambers 13a folded up adjacent to the first side surface 13e opposite to the second side surface 13d contacting the outer peripheral surface of the flange 13c wound from one end side. The part 13f is stored along the roof side rail part in a long state folded upward (see FIG. 2). Then, it is supplied through a high-pressure inflator gas power duct 12 b ejected from the inflator 12.

By the way, in the head protecting airbag device 11 shown in FIG. 1, the airbag 13 introduces the force inflator gas in the substantially central portion of the length in the vehicle longitudinal direction of all the chamber portions 13a. In addition, a gas inlet 13g connected to the duct 13b is provided. [0023] And the inflator gas force ejected from the gas inlet 13g The vertical width of the duct 13b in the inflator gas direct reach area A reaching the lower boundary line Lb without hitting anywhere in the duct 13b in the ejection direction dl is wider than the vertical width d2 of the other duct part.

 [0024] When the vehicle is installed in an automobile in which a B pillar protrudes into the vehicle interior as shown in FIG. 4, the inflator gas direct reach area A corresponds to the step portion of the roof side rail portion. Therefore, the vertical width dl of the duct 13b at the stepped portion in the middle of the air nodg 13 being deployed is made wider than the vertical width d2 of the other duct portions.

 [0025] Means for making the vertical width dl of the duct 13b in the stepped portion or the inflator gas direct reach region A wider than the vertical width d2 of the other duct portions is, for example, as shown in FIG. What is necessary is just to comprise Lb lower than another part.

 [0026] In the head protection airbag device of the present invention, the vertical width dl of the duct 13b in the stepped portion or the inflator gas direct reach area A is wider than the vertical width d2 of the other duct portions. The following effects can be obtained.

 [0027] When the inflator 12 is activated, the high-pressure inflator gas jetted from the inflator 12 is well guided into the duct or the chamber on the downstream side of the overhanging portion, effectively increasing the internal pressure in the duct. Can be suppressed. Therefore, the airbag 13 of the overhanging portion does not rise upward, and no gas is trapped in the overhanging portion, so that it does not rupture.

 That is, in the head protecting airbag device 11 of the present invention, even if there is an overhanging portion on the roof side rail to which the airbag 13 is attached, the airbag 13 does not rupture at that portion. Therefore, the head of the occupant can be reliably protected.

 [0029] Incidentally, the present invention device (dl = 57.5 mm, d2 = 47.5 mm during deployment) and the conventional device (dl = d2 = 50 mm), the inflator 12 was operated, and the internal pressure of the airbag 13 at the position shown in FIG. 1 was measured. The results are shown in Fig. 3.

[0030] In the case of the conventional apparatus, the airbag is turned up at the downstream side portion and becomes a gas puddle. And when 7msec has passed since the operation of the inflator, The inner pressure was about 235mPa and the outside of the car burst.

[0031] On the other hand, in the case of the apparatus of the present invention, the vertical width of the duct at the stepped portion is wider than the vertical width of the other duct portions, so the internal pressure of the airbag is 210 mPa at the maximum, I never did.

 [0032] Needless to say, the present invention is not limited to the above-described example, and the embodiments may be appropriately changed within the scope of the technical idea described in each claim.

 For example, in the cross-sectional view of FIG. 2, the folding portion 13f is provided only on the right side with respect to the flange portion 13c. However, the folding portion 13f is provided substantially symmetrically on both the left and right sides of the flange portion 13c. You can panic. Further, for example, in the invention according to claim 1, the gas inlet for introducing the inflator gas into the duct does not necessarily have to be provided above the substantially central portion in the front-rear direction of all the chambers of the airbag. good.

 Industrial applicability

[0033] The head protecting airbag device of the present invention is used by being installed in an automobile. However, it can also be installed on a vehicle such as an aircraft or a ship other than a vehicle, and the same effect is exhibited.

Claims

The scope of the claims  [1] Inflator and  A roof side rail having a stepped portion protruding in a vehicle interior direction orthogonal to the longitudinal direction of the vehicle is mounted so as to get over the stepped portion, and a high-pressure inflator gas ejected from the inflator is supplied to an upper sewing line and a lower portion. A foldable part adjacent to the first side that is supplied via a duct surrounded by a boundary line and expands and expands between the occupant's head and the inner side of the passenger compartment, and on the opposite side of this foldable part A head protecting airbag device including an airbag having a collar portion disposed on a second side surface,  A head-protecting airbag device characterized in that the width in the vertical direction of the duct corresponding to the stepped portion in the middle of deployment of the airbag is wider than the vertical width of the other duct portion. [2] Inflator,  A high-pressure inflator gas that is also blown out by the inflation hawk is supplied through the outside surrounded by the upper sewing line and the lower boundary line, and is inflated and deployed between the head of the passenger and the inner side of the passenger compartment. 1. A head protecting airbag device comprising an airbag having a folding portion adjacent to one side surface and a collar portion disposed on a second side surface opposite to the folding portion, the airbag The bag has a gas guide connected to the duct into which inflator gas is introduced from substantially above the central portion with respect to the vehicle longitudinal direction length of all the chamber portions of the airbag.  The inflator gas reaches the lower boundary line of the duct without hitting anywhere in the duct in the direction of gas ejection from the gas inlet, and the vertical width of the duct in the inflator gas direct reach area is the other duct. An airbag device for protecting a head, wherein the airbag device is wider than a vertical width of the portion.  [3] The inflator gas direct reach region that reaches the lower boundary line of the duct without hitting anywhere in the duct in the gas ejection direction of the inflator gas, [3] Air bag device for head protection. [4] The structure according to any one of claims 1 to 3, wherein a lower boundary line of the duct in the stepped portion or the inflator gas direct reaching region is configured to be lowered from other portions. An air bag device for protecting a head according to 1.