KR100788189B1 - Passenger air bag module for car and folding method of the same - Google Patents

Abstract

A passenger air bag module for a vehicle and a folding method thereof are provided to protect a passenger by restraining the direction of an air bag cushion through adjustment of deployment pressure during an initial stage of deployment of the air bag cushion. A passenger air bag module for a vehicle includes an air bag cushion(10) inflated by injected gas, and an outer tether(20) which covers the air bag cushion, and has a tear line which is torn by a predetermined pressure. The tear line is formed on an upper or lower portion of the outer tether, and permits the air bag cushion to be deployed upwardly or downwardly by concentrating a pressure to the tether line during deployment of the air bag cushion.

Description

Passenger air bag module for car and folding method of the same}

1 is a process diagram showing a folding process of the passenger seat airbag for an automobile according to an embodiment of the present invention;

2 is a plan view of an external tether according to an embodiment of the present invention;

Figure 3 is a development process of the passenger seat airbag module for a vehicle according to an embodiment of the present invention,

Figure 4 is a state diagram showing a broken state of the external tether according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: airbag cushion, 20: external tether,

25: Tearline, 30: Airbag cover.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger seat airbag module for a vehicle and a folding method thereof, and in particular, a passenger's face response area is not fully deployed at the beginning of the airbag cushion deployment, and thus, passengers are protected from impacts on the passenger's face and other body parts at the beginning of deployment A passenger seat airbag module and a folding method thereof for preventing an injury of an automobile are provided.

In the event of a car collision, the inertia of the passenger is suddenly leaned forward, and in some cases, the upper body of the passenger may hit the instrument panel, which may cause serious injury.

In order to prevent such injuries, recently, airbags are installed on the instrument panel to be deployed in the event of a frontal collision to promote passenger safety.

The airbag is composed of an inflator with a gunpowder embedded therein, an airbag cushion deployed by the air expanding when the explosive is exploded in the inflator, a door assembly in which the airbag cushion is opened when deployed, and a housing assembly in which the inflator and the airbag cushion are embedded. .

The airbag cushion includes a main panel and a side panel.

In addition, the inside of the airbag cushion is provided with an internal tether connected to the fixed bar in the main panel and the inflator to maintain the airbag shape when fully deployed.

Therefore, when a collision with a certain intensity or more occurs, an operation signal from the airbag controller activates the detonator inside the inflator through a wire to explode the gunpowder, thereby inflating the airbag cushion by the inflation force of the airbag to support the upper body of the passenger. Will be prevented.

Recently, the instrument panel integrated type, in which the passenger seat airbag door is integrally formed on the instrument panel, has become mainstream, and the opening part shape of the door is moved to the outside to reduce the anxiety caused by the airbag and the design freedom. Invisible Tear-Seam types are emerging.

However, in the current technology, it is difficult to satisfy the passenger seat airbag deployment performance for abnormal seating passengers, and also, in order to satisfy the performance, it is necessary to use a considerable test cost and other auxiliary devices such as a passenger sensor or a seat position sensor.

In addition, recent legislation in North America has legalized satisfaction of injury performance in passengers' out-of-position (OOP) seats. It requires a highly secure design and development that is not coated.

On the other hand, the time for the upper body of the passenger to lean in a crash is very short, so the deployment of the airbag is instantaneously within a much faster time.

However, in the case of an accident such as a head-on collision in the OOP posture, the airbag deployment speed is too fast, and at the beginning of the deployment, the main panel of the airbag cushion pops up toward the passenger, so the airbag cushion deployment pressure is increased. Passed directly to the passenger's bow to hit the face, rather than the passenger's neck was flipped back, causing a serious injury.

In addition, the airbag cushion having a conventional internal tether is thrown out of the airbag cushion by a sudden impact such as a punch out force, there is a disadvantage that can not protect the passenger safely.

The present invention has been made to solve the above-described problems, the overall deployment of the airbag cushion is fully deployed to support the upper body of the passenger quickly, the pressure applied to the passenger face response area (main panel) of the airbag cushion at the beginning of deployment By temporarily dispersing the two sides (side panel) to delay the expansion of the face response area to prevent the passenger's face shock by the air bag to prevent injury to the passenger's face and other body parts, and also An object of the present invention is to provide a passenger seat airbag module and a folding method thereof, which can be easily folded.

In order to achieve the above object, a passenger seat airbag module of an automobile according to the present invention comprises: an automobile passenger seat airbag module comprising: an airbag cushion inflated and deployed by gas inflow; The outer tether is formed to surround the airbag cushion and is broken by a predetermined pressure, wherein the tearline is formed at an upper or lower portion of the outer tether, so that the pressure is applied to the tearline when the airbag cushion is deployed. By concentrating it is characterized in that the airbag cushion is deployed to the top or bottom.

The tear line is formed to be bent at both sides at the center portion.

In addition, the folding method of the passenger seat airbag for a vehicle of the present invention to achieve the above object, the first step of folding the airbag cushion in one direction; A second step of winding an outer tether formed with a tear line broken by a constant pressure on a central portion of the folded airbag cushion; A third step of folding both sides of the airbag cushion in the direction of the outer tether; A fourth step of covering the airbag cushion with an airbag cover, wherein the tearline is formed on the upper or lower portion of the outer tether, so that the pressure is concentrated on the tearline when the airbag cushion is deployed, the upper airbag cushion Or characterized in that to be deployed to the bottom.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a process chart showing a folding process of the passenger seat airbag for a vehicle according to an embodiment of the present invention, Figure 2 is a plan view of an external tether according to an embodiment of the present invention.

The passenger seat airbag module for a vehicle of the present invention includes a housing assembly, an airbag cushion 10, an external tether 20, and an airbag cover 30.

The housing assembly is the same as the conventional one, in which an inflator is mounted, the airbag cushion 10 is seated, and a fixing bracket is installed to be fixed to the instrument panel by bolts.

The airbag cushion 10 is composed of a main panel and a side panel. The main panel refers to a surface contacting the passengers during a collision, and the side panel refers to a surface sealing in contact with both sides of the main panel.

The airbag cushion 10 expands and expands due to the inflow of gas generated during the explosive explosion in the inflator.

The outer tether 20 has a rectangular shape as shown in FIG. 2, and as shown in FIG. 1 in order to temporarily delay a part of the deployment surface when the airbag cushion 10 is deployed. The airbag cushion 10 is wrapped.

The outer tether 20 is made of a nonwoven fabric made of nylon (PA6), polypropylene (PP), polyethylene terephthalate (PET), and a fabric made of Tyvek, nylon (PA66).

At this time, the outer tether 20 to surround the deployment center portion in the vertical direction from the top of the airbag cushion 10, by deploying the face corresponding part of the passenger when the airbag cushion 10 is deployed by the outer tether 20 The pressure applied to the center is temporarily distributed to both ends so that the expansion of the deployment center is delayed for a certain time and both ends are developed first.

In addition, the outer tether 20 covers only the deployment center portion, not the entire deployment surface of the airbag cushion 10, so that the pressure of the deployment center portion is distributed to a portion that is not covered by the external tether 20, that is, at both ends. So that both ends can be inflated first.

After a predetermined time, the outer tether 20 is separated so that the entire airbag cushion 10 can be unfolded. The upper or lower portion of the outer tether 20 may be broken by a constant pressure of the airbag cushion 10. The tear line 25 is formed.

The tether line 25 makes the outer tether 20 remarkably thinner than the thickness of other portions in the width direction of the outer tether 20 or makes the slits discontinuously, so that the outer tether 20 has an airbag cushion ( When the expansion force of 10) is received, the tear line 25 portion is torn before other portions.

As described above, the tear line 25 is formed on the upper or lower portion of the outer tether 20, so that the air bag cushion 10 when the air bag cushion 10 is deployed by the gas inlet to the tear line 25 It can be deployed to guide to the formed top or bottom.

The outer tether 20 has a length of 6 times or less based on a surface where the airbag cushion 10 and the housing assembly face meet, and the width of the outer tether 20 is less than twice the width of the housing assembly width.

In addition, the tear line 25 is bent to be inclined to both sides at the central portion, such as the '∧' shape or '∨' shape shown in Figure 2 is formed.

By doing so, when pressure is applied to the outer tether 20, stress is concentrated at the center portion, which is the bent portion of the tear line 25, and the airbag cushion 10 is symmetrically deployed while being torn equally from the center portion to both sides. It is possible to further reduce the injuries of passengers.

In this case, the tear line 25 may be formed in a '∪' or '∩' shape.

Looking at the folding of the airbag in detail, the airbag cushion 10 as shown in Figure 1 (a) is wound in one direction as shown in Figure 1 (b).

As illustrated in FIG. 1C, the outer tether 20 is wound around the center of the folded airbag cushion 10 in which a tear line 25 is broken by a constant pressure.

As shown in FIG. 1 (d), both sides of the airbag cushion 10 are folded in the direction of the outer tether 20 to reduce the size of the airbag cushion 10.

The airbag cushion 10 is covered with the airbag cover 30, as shown in FIG.

By the folding method as described above, the airbag cushion 10 having the external tether 20 can be easily folded.

By doing so, when the airbag cushion 10 is deployed by the outer tether 20 in which the tear line 25 is formed at the center, both ends of the airbag cushion 10 are first deployed. The tear line 25 is separated by the deploying pressure of the entire airbag cushion 10.

Therefore, the expansion of the deployment center portion is delayed at the beginning of deployment to guide the deployment direction of the airbag cushion 10 to both ends, whereby the face part and other body parts of the passenger can be prevented from injuring due to the airbag deployment pressure.

In addition, the tear line 25 is formed on the upper or lower portion of the outer tether 20, can guide the deployment direction of the airbag cushion 10 to the upper or lower, further reducing the injury value of the passenger Can be.

The airbag module thus configured is mounted on the instrument panel of the vehicle.

3 is a development process diagram of a passenger seat airbag module for a vehicle according to an embodiment of the present invention, Figure 4 is a state diagram showing a broken state of the external tether 20 according to an embodiment of the present invention.

Figure 3 (a) shows that the outer tether 20 in the mounting state before the vehicle passenger seat airbag module according to the present invention is deployed, the airbag cushion 10 is wrapped, Figure 3 (b) is the initial deployment In the expansion center portion of the airbag cushion 10 shows that the expansion is suppressed by the outer tether 20 so that the pressure is distributed to the left and right ends.

3 (c) shows that the airbag cushion 10 has a predetermined pressure applied thereto, so that the tear line 25 of the external tether 20 is separated and the airbag cushion 10 is developed. (d) shows that the airbag cushion 10 is fully deployed.

Here, the development timing affecting the OOP performance is when FIG. 3 (b).

4 (a) shows that the tear line 25 is broken when the tear line 25 is formed on the top of the outer tether 20 so that the airbag cushion 10 is deployed upward, and FIG. 4 (b) 2 shows that the tear line 25 is broken when the tear line 25 is formed below the outer tether 20 so that the airbag cushion 10 is deployed downward.

In order to accelerate the development timing, the tensile stress of the tear line 25 is weakened so that the external tether 20 is separated from the weak inflation pressure, and in order to delay the development timing, the tensile stress of the tear line 25 is strengthened. The outer tether 20 is separated by a strong expansion pressure.

The passenger seat airbag module and the folding method for automobiles of the present invention are not limited to the above-described embodiments, and various modifications can be carried out within the allowable technical spirit of the present invention.

According to the passenger seat airbag module and the folding method of the present invention as described above has the following effects.

First, by restraining the direction in the front direction of the passenger due to the adjustment of the cushion deployment pressure in the early stage of deployment of the airbag cushion, there is an effect that can reduce the injury by the airbag of the OOP posture passenger.

Second, the outer tether wraps and supports the deployment center portion of the airbag cushion in the vertical direction, thereby temporarily dispersing the pressure applied to the deployment center portion during the initial deployment of the airbag cushion to delay the expansion of the deployment center portion. This has the effect of eliminating the risk of injury to the passenger from accidental impacts such as punch out forces on the passenger's face and other body parts.

 In addition, the tear line formed on the upper or lower portion of the outer tether is separated after a predetermined time or a certain amount of deployment, thereby suppressing the expansion of the deployment center only at the beginning of deployment, and the entire airbag cushion is inflated and deployed at the end of deployment. Quickly support the upper body to prevent the impact.

Third, by forming the tear line inclined to both sides from the center portion, when pressure is applied to the external tether stress is concentrated in the center portion, which is the bent portion of the tear line to tear the same from the center portion to both sides, airbag cushion left and right The symmetrical deployment can further reduce the passenger injury.

Fourth, since the outer tether is wound and the both sides of the airbag cushion are folded again while the airbag cushion is wound in one direction, the airbag cushion having the outer tether can be easily folded.

Claims (3)

In the passenger seat airbag module for an automobile, An airbag cushion inflated and deployed by gas inflow; It comprises an outer tether surrounding the airbag cushion and formed with a tear line that is broken by a constant pressure, The tear line is formed on the upper or lower portion of the outer tether, so that the pressure is concentrated on the tear line when the air bag cushion is deployed so that the air bag cushion is deployed to the upper or lower portion of the passenger seat airbag module . The method of claim 1, The tear line is a passenger seat airbag module, characterized in that formed by bent inclined to both sides at the center portion. First step of folding the airbag cushion in one direction; A second step of winding an outer tether formed with a tear line broken by a constant pressure on a central portion of the folded airbag cushion; A third step of folding both sides of the airbag cushion in the direction of the outer tether; In the fourth step of covering the airbag cushion with an airbag cover, The tear line is formed on the upper or lower portion of the outer tether, so that the pressure is concentrated on the tear line when the air bag cushion is deployed so that the air bag cushion is deployed to the upper or lower portion of the passenger seat airbag for an automobile. Folding method.

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