KR20040023323A - Air bag cushion with plural tether - Google Patents

Abstract

PURPOSE: An airbag cushion is provided to inflate the airbag cushion by stages and to prevent the injury of a passenger by having a plurality of tethers different from each other in length. CONSTITUTION: A plurality of tethers are fixed to the rear(23) and front(22) of an airbag cushion(21) by sewing units(25), and are different from each other in length to control the inflation of the airbag cushion by stages. The tethers includes first short tethers(27), and second tethers(28) longer than the first tethers.

Description

Airbag cushion with plural tethers {AIR BAG CUSHION WITH PLURAL TETHER}

The present invention relates to an airbag cushion having a plurality of tethers. More specifically, the tether formed inside the airbag cushion is composed of a plurality of tethers having different lengths, thereby adjusting the deployment stage of the airbag cushion. The present invention relates to an airbag cushion having a plurality of tethers, wherein the injury of the passengers due to the initial deployment of the cushion is eliminated.

In general, an automobile is equipped with an air bag system on a steering wheel or an instrument panel to protect a driver and a passenger in case of a collision, thereby inflating an air bag in the event of a vehicle crash. Injury can be reduced by avoiding collision with panels or windshields.

Briefly looking at such an airbag system, a cover installed in the instrument panel or steering wheel and formed so that the deployment part is directed to the passenger side, and the inflator which generates gas when the vehicle collides by controlling the operation by the input operation control signal. an airbag module comprising an inflator, an air bag cushion inflated and deployed through the deployment portion by the gas generated by the inflator, and a shock signal when the acceleration speed reaches a set value due to the rapid decrease in the traveling speed. It consists of a shock sensor generated and an electronic control module (Electronic control module) for exploding the primer of the inflator in accordance with the shock signal.

In this case, the inflator includes a primer ignited by an operation control signal output from the electronic control module, and a gas generator that generates gas as the primer is ignited.

Looking at the operation of the airbag system having the above configuration, if the running speed is sharply lowered by the frontal collision, the shock sensor detects this to generate a predetermined signal, the electronic control that recognizes the shock signal output from the shock sensor The module ignites the primer to burn the gas generator.

At this time, since the gas generating agent rapidly generates gas, the airbag cushion is rapidly inflated and deployed, and the airbag cushion thus deployed protects the passenger by preventing the head and chest of the passenger from moving forward by the inertia. At the same time, since the impact energy is absorbed by the discharge of the expanded gas into the discharge hole formed in the airbag cushion, the impact force transmitted to the passenger in the event of a collision can be effectively buffered to reduce the passenger's injury.

On the other hand, Figure 1 is shown as a cross-sectional view of the conventional airbag cushion, the airbag cushion 11 is in contact with the body of the occupant so as to prevent damage to the airbag cushion 11 and the injury of the occupant due to rapid expansion during deployment The inner circumference of the front portion 12 and the inner circumference of the rear portion 13 into which gas is injected from the inflator are provided with a plurality of tethers 17 which both ends are sewn to form the sewing portion 15.

That is, the tether 17 supports the front part 12 and the rear part 13 in a predetermined shape and a predetermined width when the airbag cushion 11 is deployed, thereby allowing the passenger side of the airbag cushion 11 to travel at a constant length. By stopping it, the airbag cushion 11 reduces injuries that may directly injure the passenger.

However, since the tether 17 plays a role after the airbag cushion 11 is inflated as much as possible, the tether 17 is likely to injure passengers due to a sudden expansion during the initial deployment of the airbag cushion 11, and the sewing portion due to the rapid expansion. 15 is frequently torn, and thereby there is a problem that the air is discharged to the torn portion and the airbag cushion 11 loses its function.

Accordingly, the present invention has been made to solve the above problems, the present invention is to provide a plurality of tethers of different lengths to allow the deployment of the airbag cushion step by step, to prevent passenger injuries. .

1 is a cross-sectional view of the conventional airbag cushion

Figure 2a is an internal cross-sectional view showing an initial deployment process of the airbag cushion according to the present invention.

2b is an internal sectional view showing the completion of deployment of the airbag cushion according to the present invention;

* Description of the symbols for the main parts of the drawings *

21: airbag cushion 22: front

23: rear portion 25: sewing portion

27: the first tether 28: the second tether

The present invention for achieving the above object, in the airbag cushion having at least one tether is fixed to the rear portion and the inner peripheral portion of the airbag cushion through the sewing portion, wherein each tether step by step the deployment shape of the airbag cushion It provides an airbag cushion having a plurality of tethers, characterized in that composed of a plurality of tethers of different lengths to control.

Hereinafter, the configuration of the present invention will be described in detail based on the accompanying drawings.

In addition, this embodiment does not limit the scope of the present invention, but is presented by way of example only and the same parts as in the conventional configuration using the same reference numerals and names.

Figure 2a is an internal cross-sectional view showing the initial deployment of the airbag cushion in accordance with the present invention, Figure 2b is an internal cross-sectional view showing the end of deployment of the airbag cushion in accordance with the present invention.

As shown, the airbag cushion having a plurality of tethers according to the present invention is inflated while forming a predetermined shape by the first tether having a short length in the process of the expansion of the airbag cushion by the supply of gas according to the ignition of the inflator The primary tether is torn by the pressure, and the secondary tether finally ends the expansion while the airbag cushion is in a perfect shape.

That is, both ends of the inner portion of the rear portion 23 and the front portion 22 of the airbag cushion 21 and the tether 26 are fixed through the sewing portion 25, and generally for maintaining the shape of the airbag cushion 21. Up and down two tethers 26 are provided.

At this time, each tether 26 is formed in pairs of two tethers 27 and 28 having different lengths up and down, and the length is short in one direction so that the airbag cushion 21 is not fully deployed but only partially deployed. The first tether 27 is formed, and in the other direction, the second tether 28 is formed longer than the first tether 27 and allows the airbag cushion 21 to be fully deployed.

Actions and effects of the airbag cushion having a plurality of tethers having the above structure are as follows.

When the airbag system is operated due to the collision of the vehicle, gas is introduced into the airbag cushion 21 and the airbag cushion 21 is inflated. The airbag cushion 21 having a short length of the first tether 27 is deployed in the first bag. It is developed by the length of the tether 27.

In the above state, gas is continuously supplied into the airbag cushion 21, and the airbag cushion 21 expands due to the gas pressure, so that the first tether 27 is torn.

At this time, the first tether 27 preferably has a strength that is easily torn when the airbag cushion 21 has a constant inflation pressure.

When the first tether 27 is torn, the airbag cushion 21 continuously expands the length of the second tether 28 to maintain the shape of the fully inflated airbag cushion 21.

As described above, the deployment speed of the airbag cushion 21 may be alleviated by the first and second tethers 27 and 28 having different lengths. It may be provided with more than one tether.

As described above, according to the airbag cushion having a plurality of tethers according to the present invention, a plurality of tethers having different lengths adjust the deployment of the airbag cushion step by step, so that the initial deployment of the conventional airbag cushion is suddenly injured in the passenger. There is an effect to solve the problem.

Claims (2)

An airbag cushion having one or more tethers fixed to a rear portion of an airbag cushion and an inner circumference of a front portion through a sewing portion, And each tether is composed of a plurality of tethers of different lengths so as to control the deployment shape of the airbag cushion step by step. The tether according to claim 1, further comprising: a first tether having a short length so that a part of the airbag cushion is deployed; An airbag cushion having a plurality of tethers, the second tether being longer than the first tether and allowing the airbag cushion to be fully deployed.