KR100571471B1 - Car airbag module and retainer of airbag module - Google Patents

Abstract

An airbag module of a vehicle according to the present invention includes an inflator for generating a high pressure gas; A cushion developed by the gas generated in the inflator; A retainer provided between the inflator and the cushion to fix the cushion; A first housing having a hole (42a) formed to move the high pressure gas generated from the inflator to the cushion and fixed to the retainer; A second housing (44a) formed to move the high pressure gas generated in the inflator to the hole (42a) of the first housing and installed inside the first housing; It includes a moving means for connecting the retainer and the second housing to rotate the second housing in the interior of the first housing to adjust the pressure or speed of the cushion that is developed during a collision according to the physique or position of the driver. This has the advantage of protecting the driver more safely in the event of a car crash.

Description

Retainer of airbag module and airbag module of car {airbag module of automible and retainer of airbag module}             

1 is an exploded perspective view of a conventional driver's seat airbag module

Figure 2 is a perspective view of the inflator fixed to the airbag housing in Figure 1

3 is an exploded perspective view showing an airbag module of a vehicle according to a first embodiment of the present invention;

4 is a cross-sectional view showing the area variable stage along the line A-A of FIG.

5 is a cross-sectional view showing the area variable stage of the vehicle airbag module according to a second embodiment of the present invention

<Explanation of symbols on main parts of the drawings>

10: case 12: first case

14: second case 20: inflator

20a: hole 30: cushion

40: retainer 42: first housing

42a: hole 44: second housing

44a: hole 46: motor

47: first gear 48: second gear

50: electromagnet 52: coil

54: core 56: spring

62: first housing 62a: hole

64: second housing 64a: hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag module of an automobile, and more particularly, to an area variable stage of an inflator for adjusting a discharge time and pressure of a gas discharged from an inflator.

In general, the airbag device of a vehicle is a safety device installed on the steering wheel to protect the driver from impact in the event of a collision of the vehicle.

1 is an exploded perspective view of a conventional driver's seat airbag module, Figure 2 is a perspective view showing an inflator fixed to the airbag housing in FIG.

As shown in FIG. 1 or FIG. 2, the driver's seat airbag module according to the related art is installed in a hub (not shown) of a steering wheel (not shown), and the airbag module 1 has a case (2) (6) forming an outline. ), An inflator 4 for ejecting high pressure gas by a signal sensed by an impact sensor (not shown) in the event of a collision of a vehicle, and a cushion 3 which is supplied toward the passenger and receives gas from the inflator 4 ) And a retainer 5 for fixing the cushion 3 to the case 2.

The case (2) (6) is composed of first and second cases, the first case (2) is provided on the operator side, the inner surface of the first case (2) the cushion (3) A tare line (not shown) is formed so that the case 2 can be cut when deployed.

In addition, the inflator 4 and the retainer 5 are installed in the second case 6.

A hole 4a is formed in the outer wall of the inflator 4, and the high pressure gas generated in the inflator 4 flows into the cushion 3 through the hole 4a.

The retainer 5 fixes one side of the cushion 3 and is fixed to the second case 6.

Looking at the operation of the prior art configured as described above are as follows.

When the impact of the vehicle is detected by the impact sensor, the control unit transmits a collision signal to the inflator 4, the inflator 4 ejects a high-pressure gas toward the cushion 3, the gas is filled Cushion 3 cuts the tare line and develops towards the driver.

However, since the conventional airbag module 1 supplies the entire gas generated from the inflator 4 to the cushion 3 through the hole 4a immediately after generation, the driver is driven by the cushion filled with gas under high pressure. Has the problem of being injured.

In addition, since the conventional airbag module 1 cannot adjust the amount of gas discharged from the inflator 4 toward the cushion 3, the pressure of the cushion 3 deployed according to the driver's physique and the driving position is not optimized. I have a problem

Alternatively, it is also possible to install a plurality of inflators to adjust the amount of gas supplied to the cushion 3, which has a problem that the manufacturing cost of the airbag module is increased because a plurality of inflators must be provided.

The present invention has been made to solve the above problems, and an object thereof is to provide an airbag module for adjusting the pressure of the gas discharged from the inflator.

Air bag module of the vehicle according to the present invention for solving the above technical problem and the inflator for generating a high-pressure gas; A cushion developed by the gas generated in the inflator; A retainer provided between the inflator and the cushion to fix the cushion; A first housing having a hole (42a) formed to move the high pressure gas generated from the inflator to the cushion and fixed to the retainer; A second housing (44a) formed to move the high pressure gas generated in the inflator to the hole (42a) of the first housing and installed inside the first housing; And a moving unit connecting the retainer and the second housing to rotate the second housing inside the first housing.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view showing an airbag module of a vehicle according to a first embodiment of the present invention, Figure 4 is a cross-sectional view showing the area variable stage along the line A-A of FIG.

As shown in FIG. 3 or 4, the airbag module of the vehicle according to the present invention includes a first case 12 positioned at a driver side and a second case 14 positioned at a steering wheel (not shown). The case 10 is configured, the inflator 20 generating high pressure gas when the vehicle collides with the gas, and the first case 12 is cut out by the gas generated in the inflator 20. A cushion 30, a retainer 40 penetrating one side of the cushion 30 to fix the cushion 30 to the second case 14 side, and a flow rate of gas generated by the inflator 20. The area to control the value is configured to include the variable stage.

The first case 12 is installed to face the driver, and the inside of the first case 12 is a tear line such that the first case 12 is cut by the cushion 30 deployed by the high pressure gas. (Not shown) is formed, and the cushion 30 is torn off the tear line by the gas of high pressure and the first case 12 is cut away and deployed toward the driver.

The cushion 30 and the retainer 40 are provided between the first and second cases 12 and 14, the inflator 20 is installed through the second case 14, and the second The case 14 is fixed to the steering wheel side.

The outer wall of the inflator 20 is formed with a plurality of holes 20a for discharging high-pressure gas generated therein.

The cushion 30 is fixed to the second case 14 by the retainer 40, the inflator 20 side of the cushion 30 is opened, and the gas generated in the inflator 20 is Filled inside the cushion 30 to develop the cushion (30). Here, one side (inflator side) of the cushion 30 surrounds the outer side of the retainer 40 and is fixed to the second case 14.

The retainer 40 is for fixing the cushion 30, the retainer 40 is located on the flow path of the gas generated in the inflator 20, the inflator 20 in the retainer 40 An area variable stage is provided for varying the flow rate of the gas generated in the c).

The area variable stage includes cup-shaped first and second housings 42 and 44 which are installed in a direction toward the cushion 30 of the retainer 40 and moving means for rotating the second housing 44. It is configured by.

The first and second housings 42 and 44 overlap each other inward and outward, and the holes 42a and 44a are formed in the first and second housings 42 and 44, respectively. Is fixed to the retainer 40, and the second housing 44 is rotatably installed inside the first housing 42.

The moving means includes a motor 46 fixed to the retainer 40 and first and second gears 47 and 48 which are power transmission mechanisms for transmitting the rotational force of the motor 46 to the second housing 44. It is configured to include).

Hereinafter, the operating process of the moving means in the first embodiment is as follows. The first gear 47 is connected to the motor 46 to rotate, and the second gear 48 is formed on the outer circumferential surface of the second housing 44. When the first gear 47 is rotated by the motor 46, the second housing 44 is connected to the first housing 42 by the first and second gears 47 and 48 engaged with each other. Rotate inside At this time, the holes 42a and 44a formed in each of the housings 42 and 44 by the second housing 44 rotated vary in area of the overlapping holes 42a and 44a.

In addition, although not shown, it is also possible to rotate the second housing 44 by providing an electromagnet between the first and second housings 42 and 44.

In addition, in the present embodiment, the moving means is shown to rotate the second housing 44, but unlike the present embodiment may be configured to rotate the first housing 42 as well as the first The two housings 42 and 44 may be rotated at the same time.

Thus, the moving means may be variously applied according to the spirit of the present invention.

Hereinafter, an operation process of the airbag module according to the first embodiment of the present invention will be described with reference to FIG. 3 or 4.

First, when a collision of a vehicle occurs, an impact sensor (not shown) detects the collision and transmits a signal to an electronic control unit (not shown), and the electronic control unit is driven by the inflator 20 to supply a high-pressure gas. The gas generated in the inflator 20 flows to the retainer 40 through the hole 20a of the inflator.

In this case, when the first and second housings 42 and 44 are in close contact with each other, the overlapping area of the holes 42a and 44a is maximum, and when the close contact is made, the gas flowing through the holes 42a and 44a as close as possible. Is the maximum flow rate.

On the other hand, when the second housing 44 is moved toward the inflator 20 by the moving means, the area of the overlapping holes 42a and 44a in the first and second housings 42 and 44 is reduced. As a result, the gas discharged from the retainer 40 is reduced by a predetermined amount compared to the maximum flow rate.

The gas introduced into the cushion 30 through the retainer 40 is filled in the cushion 30 and deployed toward the driver.

5 is a cross-sectional view showing the area variable stage of the vehicle airbag module according to a second embodiment of the present invention.

As shown in FIG. 5, the second embodiment according to the present invention is configured similarly to the first embodiment, and moves to the cushion 30 side or the inflator 20 side without rotating the second housing 64. Let's do it.

Thus, the moving means moves the inner housing 64 to the cushion 30 side or the inflator 20 side in the first and second housings 62 and 64 located inside and outside. Electromagnet 50 for generating a magnetic force by the current applied between the first and second housings 62 and 64 and a spring 56 for providing an elastic force between the first and second housings 62 and 64. It is configured to include.

Here, the first housing 62 is fixed to the retainer 40, and the second housing 64 is installed inside the first housing 62, so that the cushion 30 side or It is moved to the inflator 20 side.

The electromagnet 50 is composed of a coil 52 and the core 54, the magnetic force is generated by the interaction of the coil 52 and the core 54 when a current is applied to the coil 52.

Hereinafter, the operation of the moving means in the second embodiment is as follows.

First, when a current is applied to the coil 52, the second housing 64 overcomes the elastic force of the spring 56 by the magnetic force generated by the electromagnet 50 and closely adheres to the first housing 62. Thus, the overlapped areas of the holes 62a and 64a formed in the housings 62 and 64 are maximized.

Next, when the current is interrupted in the coil 52, the spring 56 interposed between the first and second housings 62 and 64 provides an elastic force to the second housing 64 to provide the second housing. Move 64 to the inflator 20 side.

The operation of the airbag module according to the second embodiment is similar to that of the first embodiment, and the area of the holes 62a and 64a is varied by the moving direction of the second housing 64 by the moving means. Although the process is different but the operation is similar, detailed description will be omitted.

On the other hand, in the first and second embodiments, the area variable stage is described only as the retainer 40 is installed, but the area variable stage is located only on the flow path of the gas generated in the inflator 20, the inflator (20) It may be provided outside.

The airbag module described in the first and second embodiments described above adjusts the flow rate of the gas discharged from the inflator 20 by varying the overlapped areas of the holes 42a, 44a, 62a, 64a, and adjusts the flow rate. By controlling the deployment speed and pressure of the cushion 30 in accordance with the physique and position of the driver can be more secure to protect the driver.

For example, when the driver's physique is larger than the average person, the distance between the driver and the deployed cushion 30 is reduced. At this time, the area of the cushion 30 is reduced by reducing the amount of gas supplied to the cushion 30 by using the variable area stage. This can reduce the impact on the driver.

Airbag module of the vehicle according to the present invention has the advantage of driving the airbag module more effectively by controlling the high-pressure gas generated in the inflator through the variable area area.

In addition, since the airbag module of the vehicle according to the present invention can adjust the pressure or the speed of the cushion that is developed during the collision according to the physique or position of the driver, there is an advantage that the driver can be more safely protected during the collision of the vehicle.

In addition, the airbag module of the vehicle according to the present invention has the advantage that the cost is reduced compared to installing a plurality of inflators because the gas generated from one inflator to adjust the area through a variable stage.

In addition, the airbag module of the vehicle according to the present invention has the advantage that the volume is reduced compared to having a plurality of inflators because the area variable stage is installed in the retainer or the inflator.

Claims (3)

An inflator for generating a high pressure gas; A cushion developed by the gas generated in the inflator; A retainer provided between the inflator and the cushion to fix the cushion; A first housing having a hole (42a) formed to move the high pressure gas generated from the inflator to the cushion and fixed to the retainer; A second housing (44a) formed to move the high pressure gas generated in the inflator to the hole (42a) of the first housing and installed inside the first housing; The airbag module of the vehicle, characterized in that it comprises a moving means for connecting the retainer and the second housing to rotate the second housing inside the first housing. The method of claim 1, The moving means is a motor fixed to the retainer, The airbag module of the vehicle, characterized in that it comprises a gear formed in the motor and the second housing for transmitting the power of the motor to the second housing. An inflator for generating a high pressure gas; A cushion developed by the gas generated in the inflator; A retainer provided between the inflator and the cushion to fix the cushion; A first housing having a hole (42a) formed to move the high pressure gas generated from the inflator to the cushion and fixed to the retainer; A second housing (44a) formed to move the high pressure gas generated in the inflator to the hole (42a) of the first housing and installed inside the first housing; An electromagnet mounted on either of the retainer and the second housing to move the second housing by generating a magnetic force; The airbag module of the vehicle, characterized in that it comprises a spring provided between the electromagnet and the retainer to provide an elastic force to the second housing.

Images