JPS6111084Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of an airbag that is inflated during a vehicle collision, absorbs the impact of a seated occupant, and protects the occupant.

(Prior Art) As shown in Fig. 1, it is widely known that an air bag B is attached to a steering wheel S in order to protect the torso, head, etc. of a vehicle occupant P. . However, in the conventional airbag structure described above, when the oval-shaped airbag B attached to the center of the steering wheel S detects fluctuations in the airbag B at the time of a vehicle collision, etc., and inflates and deploys, as shown in FIG. As a result, the upward escape angle bug B tends to be inappropriate for the occupant P.

This means that the upward opening angle (torso angle) between the steering wheel and the passenger's upper body is generally 24~
This is because the space in the passenger's chest is narrow at about 26 degrees, and during the expansion process, the bag initially stretches in the direction of the fluid jet, causing a pounding phenomenon like a rubber ball and making it unstable, making it easier to escape upwards. This tendency accelerates as the occupant restraint progresses, and in the case of the existing steering wheel as described above, the upper part of the wheel is twisted by the bag, and the bag escapes to the front of the upper part, eventually becoming useless for protection.

This phenomenon is almost the same in general passenger cars since the positional relationship between the occupant and the steering wheel is not much different, but as the torso angle increases, the phenomenon becomes more severe and the occupant is less restrained.

Therefore, in order to overcome the above-mentioned inconvenience, a sub-bag is provided above the main bug provided on the steering wheel, and the enlargement of the sub-bag prevents the main bug from escaping upward (for example,
51-31467, etc.), and airbags with a double bag structure in which an inner bag with multiple gas release ports is placed inside an outer bag (see Japanese Utility Model Publication No. 50-108140). ), but both of these are uneconomical because they require two gas generators, and the former requires two gas generators.
In addition, the latter type has a complicated structure for the part that is attached to the gas generator, and the gas is released from the hole on the side of the inner bag into the outer bag. The problem of not being able to reach the abdomen sufficiently due to the lack of vertical and horizontal expansion and hitting the abdomen with the lower part of the steering wheel has not been fully resolved, and there is still room for further improvement in these points.

The present invention was devised to further improve the conventional airbag by focusing on the actual situation of the conventional airbag as described above. Front and rear 2 between the side rear chamber and the front chamber facing the passenger's body
By partitioning the airbag into a chamber and connecting the partitioning member and the gas outlet opening with an expansion limiting member, the air bag is prevented from expanding in the gas ejection direction due to the gas ejected at high speed, and the rear chamber is connected to the steering wheel. The purpose is to inflate in the circumferential direction of the top, bottom, left, and right, and to disperse and diffuse gas into the front chamber through the pores of the partitioning member, thereby ensuring the restraint and protection of not only the upper body but also the lower body of the seated occupant. be.

(Means for Solving the Problems) The feature of the configuration of the present invention that achieves the above object is that an air bag is attached to the steering wheel so as to face the passenger, and an air bag is inserted into the center of the steering wheel. A donut-shaped base bag that has a center hole attached to the periphery of the gas blowing opening of the generator and expands outward from the center hole, and a circular outer bag that is approximately the same size as the base bag. The air bag is formed by joining at the peripheral edge, and the peripheral edge is fixed to the joint between the base bag and the outer bag within the air bag, and the space surrounded by both bags is divided into two chambers, front and rear, through which high-speed fluid can pass. A partitioning member is provided, and a partitioning member is provided, and the gas blowing opening in the center of the steering wheel extends toward the partitioning member and extends into the room defined by the base bag and the partitioning member. The point is that an extension limiting member is provided to which the parts are fastened.

(Example) Hereinafter, specific aspects of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a schematic cross-sectional view showing one example of the airbag of the present invention, and in the figure, 1 indicates the steering wheel S.
a base bag attached to the center of the base bag 1;
has a donut shape with a center hole 1 and expands outward from the center hole 1, has a circular outer bag 2 of approximately the same size as the base bag 1, and an intermediate bag 2 interposed between both bags 1 and 2. Together with the partition member 3, the two chambers are sewn 5 at the same time at the peripheral edge, and the interior is partitioned into a rear chamber A ₁ located on the steering S side and a front chamber A _{2 located on the passenger P side with the partition member 3} as a boundary. It constitutes a structural airbag.

The base bag 1, the outer bag 2, and the partition member 3 are all made of, for example, a woven fabric made of synthetic fibers such as nylon, or a material in which the woven fabric is coated with rubber or resin to prevent gas leakage. In particular, when the partitioning member 3 is made of a non-breathable coating fabric, as shown in FIGS. 2 and 3, both the front and rear chambers are
A communication hole 4 is provided to communicate A ₁ and A ₂ and allow high-speed fluid to flow therethrough.

In the above configuration, a gas generator 1 is inserted into the rear chamber A ₁ partitioned by the partition member 3 through a center hole 1 ′ formed in the center of the base bag 1 .
A gas blowout opening 12 including one gas blowout opening 12 is inserted therein, and an extension limiting member 6 having one end overlapped on the inner surface of the peripheral edge of the center hole 1'.
is sewn 8 together with the reinforcing cloth 7 on the outer peripheral edge, and the other end extends toward the partitioning member 3, and the cloth 9 and the sewing 10 are sewn at the center of the partitioning member 3 as shown in detail in FIG. This restricts the expansion of the partitioning member 3 in the direction in which the high-speed fluid is ejected.

The extension limiting member 6 is preferably made of a string material such as a tape, a belt, or a string, and preferably has 4 to 6 pieces of string material, and is preferably flexible. Should be avoided. Generally, fiber materials such as the base bag 1, outer bag 2, and partition member 3 are used.

Note that the partitioning member 3 is usually constructed by punching a large number of flow holes 4 in a non-breathable coating fabric, but the structure of the partitioning member 3 is not particularly limited to this, and for example, A similar gas diffusion effect can be achieved by using a synthetic fiber woven cloth or the like that has air permeability.

In addition to the above, the base bag 1, the outer bag 2, and the partition member 3 are made by combining the breathable woven fabric and the non-breathable coating fabric. In some cases, fluid circulation holes 4 may be provided, or even in the case of a breathable woven fabric, various modifications of the air bag can be made by providing holes as necessary.

However, if the outer bag is made of coated cloth, the cloth itself tends to become stiff, making it less suitable for contact with the passenger.In order to reduce weight, it is preferable to use uncoated cloth for the outer bag.

However, in either case, the extension limiting member 6 is placed in the rear chamber.
_A1 is an essential feature of the present invention.

Furthermore, although the base bag 1, outer bag 2, partition member 3, and extension limiting member 6 are joined by sewing in each of the above figures, it is also possible to join them by adhesive processing with the same effect.

Thus, the present invention has the configuration as described above, and its operation will now be described. In the event of an abnormality such as a vehicle collision, the gas generator is activated by a signal received from a bug activation signal generation circuit operated by a sensor (not shown). When the high-speed fluid is ejected into the bag, the high-speed fluid first fills the rear chamber _A1 and tries to project the partition member 3 in the direction of gas ejection, but the expansion restriction member 6 suppresses the bag as a whole. It expands flat in the circumferential direction, and the lower part enters the narrow space between the passenger and the steering wheel to protect the passenger's chest and abdomen, and also protects the passenger from the rear chamber _A1 to the partition member 3.
The high-speed fluid discharged through the front chamber then flows into the front chamber A ₂ and expands the front chamber A ₂ to further restrain the occupant's chest and further restrain the head to ensure protection. .

(Effects of the invention) As described above, the airbag of the present invention has a two-chamber structure divided into the front and rear by partition members, and by providing an extension limiting member in the rear compartment on the steering side,
When high-speed fluid is ejected, rapid expansion is first suppressed, allowing the rear chamber to expand flatly in the circumferential direction around the steering wheel, which is difficult to do in the past. By inserting the bag into the narrow space between the vehicle and the steering wheel, it is possible to protect the occupant's chest and abdomen, and the subsequent flow of fluid into the front compartment provides a cushioning function that protects the occupant's body in the event of a collision. It has the effect of providing a buffering effect against the forward tilting of the vehicle, and providing reasonable protective restraint against the movement of the occupant during a collision.
There is no need to install multiple gas generators, and one gas generator is sufficient to exhibit its effectiveness, facilitating the simplification of the configuration, and its practical effects are often great.

Moreover, according to the present invention, it is possible to create an air bag by simply sewing together the peripheral edge of the partition member when sewing the base bag and the outer bag, and separately,
There is no need to prepare two airbags, which reduces the rise in material and manufacturing costs.In addition, it is only necessary to attach one airbag with a built-in partition member and extension limiting member to the steering wheel, which reduces the structure of the mounting part. It can be simplified, does not impede assembly into a vehicle, and has the practical effect of improving work efficiency when installing and replacing airbags.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the bag inflation state by a conventional air bag device, Fig. 2 is a cross-sectional schematic diagram showing an example of the air bag of the present invention, and Fig. 3 is Fig. 2
It is an X-ray arrow view. 1... Base bag, 2... Outer bag, 3... Division member, 4
... Distribution hole, 6 ... Extension restriction member, 11 ... Gas generator, 12 ... Gas blow-off opening, A ₁ ... Rear chamber,
A ₂ ...Front chamber, S...Steering wheel, B...
...Airbag, P...crew.

Claims (1)

[Claims for Utility Model Registration] 1. An airbag attached to a steering wheel so as to face the occupant, the airbag being attached to the periphery of a gas blowing opening of a gas generator inserted into the center of the steering wheel. It is formed by joining a donut-shaped base bag having a central hole to be attached and expanding outward from the center hole, and a circular outer bag having approximately the same size as the base bag at their peripheral edges, and The air bag further includes a partition member through which a high-speed fluid can pass, the peripheral edge of which is fixed to the joint between the base bag and the outer bag, and which divides the space surrounded by both bags into two chambers, front and rear. In a room defined by the bag and the partition member, a portion extending from the peripheral edge of the gas blowing opening of the gas generator inserted into the center of the steering wheel toward the partition member and extending into the center of the partition member. An airbag for a driver, characterized in that the airbag is equipped with an expansion limiting member to which the airbag is fixed. 2. An airbag for a driver as set forth in claim 1 of the utility model registration claim, in which a high-speed fluid flow hole is provided in the partitioning member to allow the high-speed fluid to pass therethrough. 3 Utility model registration claim 1 in which the partitioning member is made of breathable woven fabric to allow high-speed fluid to pass through it
Airbag for the driver as described in section. 4. An airbag for a driver according to claim 1, 2, or 3, wherein the extension limiting member is a flexible string material. 5. The airbag for a driver according to claim 4, wherein the expansion limiting member is a nylon woven tape.