KR100622123B1 - passenger air bag module for a vehicle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger seat airbag module for a vehicle, and more particularly, an automobile passenger seat capable of improving an air cushion deployment aspect in a good direction for out of position performance using a circulation of inflator gas. Relates to an airbag module.

Description

Passenger air bag module for a vehicle

1 is a cross-sectional view showing a planar structure of a passenger seat airbag module installed in a conventional vehicle.

Figure 2 is an exploded perspective view showing a conventional general inflator.

Figure 3 is an exploded perspective view showing a passenger seat airbag module for a vehicle according to a preferred embodiment of the present invention.

4 is a combined view of FIG.

5 is a plan view showing a state in which the locking body and the unlocking body is installed in FIG.

FIG. 6 is an enlarged bottom view of the lock and release body of FIG. 5; FIG.

Figure 7 is an operating state of Figure 6;

8 is a cross-sectional view showing a side structure of the air cushion of Figure 3 deployed state.

9 is a schematic diagram showing a planar structure of another temporary example of FIG.

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

10 door 11: crash pad

20: passenger seat airbag module 21: air cushion

26: Nut 30: Diffuser Cap

32: gas ejection hole 50: harness

60: ignition device 100: housing

120: housing side portion 140: fastening hole

160: through hole 200: inflator

340,440 fastening part 342,442 cylindrical part

344,444: fastening protrusion 344a, 444a: sliding part 344b, 444b: screw part 400: cylindrical body

460: extension 500: cutter

600: lock 620: fixed piece

640: bending piece 700: release body

800: washer 900: motor

910: power transmission unit

By adopting a structure in which the inflator is rotatable from the housing, the present invention can improve the air cushion development in a direction that is good for out of position performance by using the inflator gas circulation. A passenger seat airbag module for automobiles.

Recently, as the interest in the safety of the passengers as well as the functionality and convenience of the vehicle has increased, the importance of safety-related devices that can safely protect the passengers in the event of a car accident is increasing. One of these safety devices, the airbag system, is used in conjunction with a seat belt to prevent the body parts of the passenger's head, chest, knees, etc. from hitting the vehicle's structure and causing injury when the vehicle crashes. On the other hand, airbag systems are often mounted in the front seats, usually in the driver's seat airbag, which is mounted on the steering wheel, and on the passenger's glove box or on the top crash pad. Can be classified as Passenger Air-bag.

Among these, the general passenger seat airbag module mounted on the vehicle is mounted inside the crash pad 11 located in front of the passenger seat of the vehicle, as shown in FIG. 1, and the configuration thereof includes an air cushion 21 and a gas. An inflator 22 that is generated and provided to the air cushion 21, a housing 23 for accommodating the air cushion 21 and the inflator 22, and a retainer for fixing the air cushion 21 in the housing 23. (Retainer; 24). In addition, the upper portion of the air cushion 21 is provided with a door 10 that opens when the air cushion 21 is inflated. The inflator 22 is accommodated in the housing 23 and one end of the inflator 22 is held and supported by one end of the housing 23, and the other end of the inflator 22 fastens the inflator nut 26 from the outside of the housing 23 so that the housing ( 23) is fixed to warn. At this time, of course, the end portion of the inflator 22 to which the inflator nut 26 is fastened is formed with a screw portion 34 for fastening with the nut 26. (Korean Patent Publication No. 2004-0065719 Reference.)

Here, as shown in FIG. 2, the inflator 22 is provided with a gas outlet 42 in one side, and a cylinder 40 having a gas generator and an ignition device 60 not shown in the other side. And a diffuser cap 30 coupled to the cylindrical body 40 and having a plurality of gas ejection holes 32 circumferentially. In addition, when a signal is detected from the collision detection sensor (not shown), the ignition device 60 is connected to the harness 50 for applying power by the signal.

In general, as the air cushion 21 is attached to the crash pad 11, the injury of the occupant may be reduced in the OOP situation.

However, since the conventional structure of the conventional passenger seat airbag module 20 of the above-described configuration cannot attach the air cushion 21 toward the crush pad 11, a de-air airbag that lowers the pressure of the air cushion 21 is provided. In application, the de-air airbag reduces occupant protection in high-speed collisions. In addition, there is a problem that the air cushion 21 is not well developed in the low temperature deployment state.

The present invention has been made to solve the above-described problem, by the inflator is rotated from the housing structure, using the circulation of the gas ejected from the inflator, to improve the development of the air cushion in a direction good for OOP performance There is a purpose.

Car passenger seat airbag module of the present invention for achieving the above object is an air cushion; An inflator for supplying gas to the air cushion; A gas outlet provided in the inflator; And a housing accommodating the inflator, wherein the inflator is configured to be freely rotated with respect to the housing upon explosion.

In the above-described configuration, the inflator is composed of a cylindrical body in which the gas supplied to the air cushion is generated, and a diffuser cap coupled to the cylindrical body, the gas outlet is installed in the cylindrical body, the gas outlet is the It is eccentric from the center of the cylindrical circumferential direction, and the gas ejection direction is made tangential to the circumferential direction.

According to this configuration, circulation occurs in the gas blown out of the inflator. In this case, Kelvin's theory of circulation produces circumferences of equal size and opposite directions in the air cushion. Therefore, the air cushion deployment state of the present invention is formed closer to the crash pad side than the conventional air cushion deployment state can reduce the injuries of the occupants in the OOP situation. Thus, the present invention can improve the development of the air cushion in a direction that is good for OOP performance by using the circulation of the inflated gas, instead of modifying the air cushion shape.

On the other hand, if a harness electrically connected to the inflator and a cutter for cutting the harness are provided, the rotation moment of the inflator can be improved because the harness, which is a rotation inhibiting element, is removed by the cutter when the inflator is rotated. The above effect using the circulation of the generated gas can be maximized.

Furthermore, if a lock body which prevents the inflator from tumbling against the housing and a release body which releases the lock body when the inflator is rotated are further provided, the rotation of the inflator is normally prevented and the vehicle is crashed. There is an explosion that allows the inflator to rotate smoothly to achieve the effect described above through the rotation.

On the other hand, the passenger seat airbag module for a vehicle of the present invention by another configuration is an air cushion; A cylindrical body in which gas supplied to the air cushion is generated; A diffuser cap disposed on the cylindrical body; A housing accommodating the cylindrical body and the diffuser cap; Rotating means for rotating the diffuser cap with respect to the housing and the cylindrical body in the event of an explosion.

In the above configuration, the rotating means is preferably made of a motor.

According to this configuration, circulation occurs in the gas blown out of the inflator. In this case, Kelvin's theory of circulation produces circumferences of equal size and opposite directions in the air cushion. Therefore, the air cushion deployment state of the present invention is formed closer to the crash pad side than the conventional air cushion deployment state can reduce the injuries of the occupants in the OOP situation. In this way, the present invention can improve the development of the air cushion in a direction that is good for OOP performance by using the circulation of the inflated gas.

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

For reference, among the configurations of the present invention to be described below, the same configuration as the prior art will be referred to the above-described prior art, and a detailed description thereof will be omitted. Figure 3 is an exploded perspective view showing a passenger seat airbag module for a vehicle according to a preferred embodiment of the present invention, Figure 4 is a combined view of Figure 3, Figure 5 is a plan view showing a state in which the lock and the release in Figure 4 is installed. 6 is a low shave showing an enlarged view of the locking body and the unlocking body of FIG. 5, FIG. 7 is an operational state diagram of FIG. 6, and FIG. 8 is a sectional view showing a side structure of the air cushion of FIG. 9 is a schematic diagram illustrating a planar structure of another temporary example of FIG. 3.

3 to 8, the passenger seat airbag module 20 for an automobile of the present embodiment includes an air cushion 21; An inflator (200) for supplying gas to the air cushion (21); A gas outlet 420 provided inside the inflator 200; It is composed of a housing 100 for receiving the inflator 200.

The inflator 200 includes a cylindrical body 400 in which gas provided to the air cushion 21 is generated, and a diffuser cap 300 coupled to the cylindrical body 400 to eject the gas.

The gas ejection port 420 is installed on the upper surface of the cylindrical body 400.

The gas outlet 420 is eccentric from the circumferential center of the upper surface (center axis in the inflator length direction C).

In addition, the gas ejection port 420 is a pipe of the letter 'A' formed, the gas ejection direction of the gas ejection port 420 is disposed in a tangential direction to the circumferential direction of the upper surface.

In addition, the stepped fastening portion 440 is provided on the lower surface of the cylindrical body 400.

The fastening part 440 includes a rod-shaped cylindrical part 442 protruding a predetermined length from the center C of the lower surface, and a fastening protrusion 444 having a smaller diameter than the cylindrical part 442.

The fastening protrusion 444 includes a sliding portion 444a having a smooth surface and a screw portion 444b having a male screw.

In addition, the lower surface is provided with a harness 50 connected to the ignition device 60, and a cutter 500 for cutting the harness 50.

Here, the cutter 500 is disposed between the cylindrical body 400 and the housing side surface portion 120 to be described later, and is not disposed below the end of the cylindrical portion 442.

Further, it is preferable that the extension portion 460 extending downward along the circumferential surface of the lower surface. The extension portion 460 is not extended downward than the end of the cylindrical portion 442, similar to the cutter 500.

The diffuser cap 300 is provided with a fastening part 340 having the same structure as the fastening part 440 on the upper surface.

Fastening holes 140 through which the fastening parts 340 and 440 are installed are formed in the housing side surface parts 120 at both sides of the housing 100, respectively. Here, the diameter of the fastening hole 140 is smaller than the diameter of the cylindrical portion (342,442). Therefore, in the process of installing the fastening portions 340 and 440 on the housing side surface portion 120, the housing side surface portion 120 is caught by the cylindrical portions 342 and 442 of the fastening portions 340 and 440 and no longer toward the cylindrical body 400. I can't go in. Accordingly, the housing side surface portion 120 is positioned on the sliding portions 344a and 444a of the fastening protrusions 344 and 444, and thus the screw portions 344b and 444b are disposed outside the side portion.

Here, the nut 26 is fastened to the screw portions 344b and 444b protruding out of the housing side surface portion 120. At this time, the corresponding surface of the nut 26 and the housing side surface portion 120 is spaced apart. Therefore, the nut 26 is used as a release preventing nut that rotates together when the inflator 200 rotates and is not separated from the housing 100. Of course, a washer 800 may be interposed between the nut 26 and the housing side part 120.

When fastened as described above and the gas is ejected, the inflator 200 is rotated in the clockwise direction A from the housing 100 about the fastening direction as shown in FIG. 3.

In addition, a through hole 160 is formed in the housing side surface portion 120 corresponding to the lower surface of the cylindrical body 400.

The harness 50 is installed through the through hole 160.

Here, when a hole is formed from the cylindrical portion 442 disposed inside the extension portion 460 to the end of the fastening protrusion 444 disposed outside the housing 100, the harness 50 is connected to the housing through the hole. 100) Can be taken out. In this case, the cutter does not need to be installed.

Furthermore, as shown in FIG. 3, the housing 100 is provided with a 'b' shaped lock 600.

The locking member 600 includes a fixing piece 620 fixed to the housing side surface part 120 by welding and a bending piece 640 vertically bent from the fixing piece 620.

The bending piece 640 is in contact with the outer circumferential surface of the inflator 200, and serves to prevent the rotation function of the inflator 200 in general by using the friction force.

On the other hand, the inflator 200 is provided with a wedge-shaped release body 700.

As shown in Figure 6, the release body 700, the wedge portion is installed in contact with the bending piece 640, and serves to lose the rotation preventing function when the inflator 200 is rotated.

Here, in addition to the method of preventing or rotating the rotation of the inflator 200 by using the locking member 600 and the release member 700, the housing side surface portion 120 inner surface and the housing side surface portion 120 inner surface Install the electromagnets that are opposite to each other in the in-plate 200 corresponding to the. Therefore, by sending a current to the electromagnet to prevent the rotation of the inflator 200 in normal times, it is also possible to smoothly rotate the inflator 200 by cutting off the current during the explosion.

The operation of this embodiment having the above-described configuration will be described below.

The ignition device 60 is operated by an ignition signal applied from the collision detection sensor when the vehicle collides, and burns a gas generating agent not shown in the inflator 200 to generate gas for inflating the air cushion 21. . The gas is ejected through the gas ejection port 420, and by the action-reaction principle during the gas ejection, the inflate 200 rotates about the vehicle Y axis direction (arrow A direction shown in FIGS. 3 and 8). Will receive.

Here, in the process in which the inflator 200 is rotated from the housing 100, the lock 600 holding the outer circumferential surface of the inflator 200 is easily deformed by the wedge-shaped release body 700 as the inflator 200 rotates. The rotation prevention function is lost. In addition, the harness 50 is cut by the cutter 500 at the same time as the inflator 200 rotates. Through the above process, the circulation is generated in the gas ejected from the inflator 200. In this case, circulation of the same size and opposite direction is generated in the air cushion 21 by Kelvin's circulation theory. Therefore, the direction of the circulation generated in the air cushion 21 is generated in the direction in which the air cushion 21 sticks toward the crash pad 11 (arrow B direction shown in FIG. 8).

Here, the sum of the circulation of point A and the circumference of point B shown in FIG. 8 is '0'. (Circulation Γ: Control Volume The surface product and gas velocity vector product inner product divided by the area of the control volume. The direction is the opposite of the integral value.)

Thus, the conventional air cushion deployment state (e) is upwardly deployed on the crash pad 11 side, but the air cushion deployment state (E) of the present invention is shown on the crash pad 11 side as shown in FIG. It is formed in the direction of sticking. Thus, the passenger seat airbag module 20 of the present invention does not deform the air cushion shape, but utilizes the circulation of the gas generated in the inflat 200 so that the air cushion 21 can be deployed in a direction that is good for OOP performance. It can be improved.

In addition, as described above, by removing the harness 50, which is a rotation inhibiting element when the inflator 200 rotates, through the cutter 500, the rotation moment of the inflator 200 may be improved, and accordingly, The effect can be maximized.

In addition, since the lock 600 is normally pressed to one side of the inflator 200, the inflator 200 may be maintained in a floating state from the housing 100. As a result, the rotation of the inflator 200 can be prevented normally. On the other hand, when the vehicle collides, the inflator 200 may be smoothly rotated to generate circulation around the inflator 200.

As shown in FIG. 9, the passenger seat airbag module for a vehicle according to another embodiment of the present invention is configured such that the diffuser cap 30 is rotated with respect to the cylindrical body 400 and the housing 100. Therefore, the diffuser cap 30 is configured to freely rotate from the housing 100 and the cylindrical body 400 through the motor 900. Here, as an example of rotating the diffuser cap 30 using a motor 900, as shown in Figure 9, the motor 900 has a housing side portion in which the fastening portion 340 of the diffuser cap 30 is installed The power transmission unit 910 (belt and gear, etc.) installed in the 120 and transmitting the rotational force of the motor 900 is connected to the fastening unit 340. Therefore, when the motor 900 rotates, the diffuser cap 30 is rotated by the power transmission unit 910.

Looking at the action of the passenger seat airbag module for a vehicle configured as described above, the gas for inflating the air cushion 21 is generated in the inflator 200 during the collision of the vehicle. At this time, power is applied to the motor 900 to rotate the diffuser cap 30. As a result, since circulation occurs in the gas ejected from the inflator 200, the same effects as in the above-described embodiment can be obtained.

The passenger seat airbag module for an automobile of the present invention is not limited to the above-described embodiment, and can be variously modified and implemented within the range permitted by the technical idea of the present invention.

According to the passenger seat airbag module for a vehicle of the present invention as described above has the following effects.

First, the inflator is configured to rotate at the same time as the gas is ejected from the housing, and circulation occurs in the gas ejected from the inflator. In this case, Kelvin's theory of circulation produces circumferences of equal size and opposite directions in the air cushion. Therefore, the air cushion deployment state of the present invention is formed closer to the crash pad side than the conventional air cushion deployment state can reduce the injuries of the occupants in the OOP situation. Thus, the present invention can improve the development of the air cushion in a direction that is good for OOP performance by using the circulation of the inflated gas, instead of modifying the air cushion shape.

Second, by having a harness electrically connected to the inflate and a cutter for cutting the harness, it is possible to maximize the effects described above by removing the rotation inhibiting element during the inflator rotation, thereby improving the rotation moment of the inflator.

Third, a lock body which prevents the inflator from turning against the housing and a release body that releases the lock body when the inflator is rotated is provided, thereby preventing the rotation of the inflator in everyday times, and the inflator rotates smoothly when the vehicle collides. It is possible to obtain the effect through the inflator rotation.

Claims (6)

delete Air cushion; An inflator for supplying gas to the air cushion; A gas outlet provided in the inflator; Including a housing for receiving the inflator, The inflator is arranged to rotate freely with respect to the housing upon explosion, The inflator is a cylindrical body in which the gas supplied to the air cushion is generated, and Comprising a diffuser cap coupled to the cylindrical body, The gas outlet is installed in the cylindrical body, The gas outlet is eccentric from the center of the cylindrical circumferential direction, A gas passenger seat airbag module, characterized in that the gas ejection direction is tangential to the circumferential direction. The harness of claim 2, further comprising: a harness electrically connected to the inplate; Vehicle passenger seat airbag module comprising a cutter for cutting the harness. 4. The lock according to claim 3, further comprising: a lock to prevent the inflator from tumbling against the housing; A passenger seat airbag module for automobiles, further comprising a release body for releasing the lock when the inflator is rotated. delete delete

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