JPH10230807A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suitably regulate an air bag after it expands into a prescribed shape and easily adjust extension timing of the air bag when it expands. SOLUTION: When impact is detected, warps 46, 48 are cut because gas is supplied to the inside of an air bag 44 and the air bag 44 expands by prescribed amount. In this case, the air bag 44 extends by the side parts of webbings 40, 42, becomes a prescribed shape and constrains an occupant because the air bag 44 is partly constrained by the webbings 40, 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seatbelt device for restraining an occupant by inflating an airbag accommodated in a seatbelt when an externally applied impact is detected.

[0002]

2. Description of the Related Art A vehicle is equipped with a seat belt device for restraining and protecting an occupant when a strong impact is applied from the outside due to a collision or the like. The seatbelt device generally includes a seatbelt including a part that is hung from the shoulder of the occupant to the waist and a waist part, and a retractor that winds and retracts the seatbelt and detects and locks an impact. ing.

[0003] In such a seat belt device, as an improvement to improve the restraint performance of the occupant, an airbag is folded and stored in a contracted state in the seat belt, and an impact is applied. When
There is a configuration in which gas is supplied from a gas supply unit into the airbag to inflate the airbag and appropriately restrain an occupant (JP-A-49-70328, JP-A-6-262994). Reference).

[0004]

However, in the seat belt device disclosed in Japanese Patent Application Laid-Open No. 49-70328, the inflatable airbag portion is exposed to the outside, and the airbag after inflation is inflated. It is not possible to regulate the shape of the lens to a predetermined shape. Therefore, there is a problem that the restraint state of the occupant is not stable.

In the seat belt device disclosed in Japanese Patent Application Laid-Open No. 6-262994, the inflatable structure accommodated between the cloth covers is not extended in the longitudinal direction of the seat belt, but is extended only in the transverse direction. It is configured to
Even with this structure, there is no guarantee that the shape after expansion can be regulated to a predetermined shape.

[0006] The present invention solves the above-mentioned problems, and can appropriately regulate the inflated airbag into a predetermined shape.
Moreover, an object of the present invention is to provide a seat belt device that can easily adjust the deployment timing of the airbag during inflation.

[0007]

In order to solve the above-mentioned problems, in a seat belt device according to the present invention, when a shock applied from the outside is detected, a contraction occurs between a first webbing and a second webbing. The airbag stored in the state inflates. In this case, the connected state by the sewing between the first webbing and the second webbing is released with the inflation of the airbag. As a result, the first webbing and the second webbing are separated from each other, and the airbag inflates from the separated portion. Since the airbag has a part of one surface and a part of the other surface joined to the first webbing and the second webbing, it is inflated only in a lateral direction along the occupant's body. Become. As a result, the occupant is appropriately restrained by the airbag.

[0008]

FIG. 1 shows a driver seat 12 in a vehicle 10.
And the seat belt devices 16A, 16A,
6 shows a schematic configuration in a state where 6B is mounted. The seat belt devices 16A and 16B have the same configuration as shown in FIG.

The seat belt devices 16A, 16B are derived from retractors 18a, 19a, 18b, 19b fixed to the lower portion of the center pillars 17a, 17b of the vehicle 10, and retractors 18a, 19a, 18b, 19b, and the driver D And waist belts 20a and 20b for restraining the waist portion of the passenger N, and a center pillar 17
a, 17b, between the driver's seat 12 and the passenger's seat 14 between the chest seat belts 24a, 24b for restraining the chest from the shoulders to the hips of the driver D and the passenger N via the hooks 22a, 22b. Console box 2
6 and gas supply means 28 to which the ends of the chest seat belts 24a and 24b are connected.

The retractors 18a, 19a and 18b, 19b have a function of winding and pulling in the chest seat belts 24a, 24b and the lumbar seat belts 20a, 20b, respectively, while detecting and locking an impact. The lumbar seat belts 20a, 20b and the chest seat belts 24a, 24b are integrated at ends separated from the retractors 18a, 19a and 18b, 19b, and the ends on the side of the chest seat belts 24a, 24b are shown in FIG. Thus, the tongues 30a and 30b are mounted.
The tongues 30a and 30b are connected to the console box 26.
Are connected to the buckle portions 32a and 32b arranged in the first position.
Gas supply means 28 is connected to the buckle portions 32a and 32b. In this embodiment, the gas supply means 2
8 is common to the respective seat belt devices 16A and 16B, but may be configured independently.

Next, the chest seat belts 24a, 24b
Is configured as shown in FIGS. 3A, 3B, 4 and 5.

That is, the chest seat belts 24a, 24
b includes first seat belts 34a and 34b whose ends are stored in the retractors 18a and 18b, and tongues 30a and 30b.
b, and second seat belts 36a, 36b, and third seat belts 38a, 38b disposed between the first seat belts 34a, 34b and the second seat belts 36a, 36b. Third seat belt 38
a, 38b are arranged on the chest of the driver D and the passenger N, and are two strip-shaped webbings 4 in parallel.
0, 42 and an airbag 44 housed between the webbings 40, 42 in a contracted state (see FIG. 4). One webbing 40 contacts the chest of driver D and passenger N. Further, the airbag 44 has a part of one surface and a part of the other surface, each of the webbings 40, 42.
Is bonded to the inner surface of the body by sewing or bonding.

The first seat belts 34a, 34b and the webbings 40, 42 are connected at their ends by sewing (FIG. 3A). As shown in FIG. 3B, the first seat belts 34a and 34b and the webbing 40
And the webbing 42 may be connected to the first seat belts 34a and 34b by sewing. Warp yarns 46 and 48 are provided along both side portions of the webbings 40 and 42, as shown in FIGS. Each of the warps 46 and 48 and the webbing 40 are connected by connecting yarns 50 and 52. Similarly, the warp yarns 46, 48 and the webbing 42 are connected by connecting yarns 54, 56.

The seat belt devices 16A, 1
6B is basically configured as described above, and its operation will be described next.

First, the driver D is seated on the driver's seat 12, and the chest seat belt 24a and the lumbar seat belt 20a are pulled out from the retractors 18a and 19a, and the tongue 30a
Is attached to a buckle 32a provided on the side of the console box 26. In this case, via the tongue 30a and the buckle part 32a, the gas supply means 28 housed in the console box 26 is connected to the third seat belt 38a,
It is connected to the airbag 44 between 38b. Similarly, the passenger N is seated on the passenger seat 14, and the retractors 18b, 19b
From the chest seat belt 24b and the lumbar seat belt 2
0b, tongue 30b and console box 2
The gas supply means 28 is connected to the airbag 44 by being attached to the buckle part 32b provided on the side of No. 6.

In the above state, when an unexpected accident occurs while the vehicle 10 is running, and when an acceleration sensor or the like detects the shock caused by the accident, the gas supply means 28 is driven and the gas is supplied to each air bag 44. Supplied to

That is, the gas supplied from the gas supply means 28 is supplied into the airbag 44 housed between the webbings 40 and 42 constituting the third seat belts 38a and 38b, whereby the airbag 44 is Begins to expand. When a predetermined amount of gas is supplied into the airbag 44, the pressure of the gas acts to separate the webbings 40 and 42.
6, 48 are cut. When the warp yarns 46, 48 are cut, the restraining state of the webbings 40, 42 by the binding yarns 50, 52 and 54, 56 sewn thereto is released. As a result, deployment of the airbag 44 is started (see FIG. 6A). By adjusting the strength of the warp yarns 46 and 48 according to, for example, the thickness and the material, the deployment of the airbag 44 at a desired tension can be realized. Further, the deployment speed of the airbag 44 can be adjusted by the number of attachment points of the binding yarns 50, 52 and 54, 56 to the warp yarns 46, 48.

Here, the airbag 44 is mounted on the driver D
Further, the webbing 40 is sandwiched between a webbing 40 in contact with the chest of the passenger N and a webbing 42 disposed in parallel with the webbing 40, and both end portions of the webbings 40, 42 are first. Seat belts 34a, 34b
And the second seat belts 36a and 36b, the expansion of the driver D and the passenger N in the direction away from the chest is prevented. Accordingly, the airbag 44 is deployed only in the side direction where the webbings 40 and 42 were sewn (see FIG. 6B).
Finally, the driver D and the passenger N are appropriately restrained by expanding as shown in FIG. 6C.

As shown in FIG. 7, the webbings 58, 60 constituting the third seat belts 38a, 38b are formed in a U-shaped cross section, and their side surfaces are sewn in the same manner as in the above-described embodiment. I do. In this case, webbing 5
The driver D and the passenger N
Abut the chest. The airbags 44 housed in the webbings 58 and 60 are partially part of the webbings 5 and 60.
8 and 60 are joined by sewing or bonding.

The webbings 58, 6 configured as described above
At 0, when the impact is detected and the airbag 44 is deployed, first, as shown in FIG. 8A, the webbings 58, 60 are separated from the sewn portion. Next, the airbag 44
Is partly constrained by the inner surfaces of the webbings 58 and 60 formed in a U-shaped cross section, so that the webbings are unfolded in the lateral direction (see FIG. 8B). And ultimately,
The driver D and the passenger N are deployed in the shape shown in FIG.
Restrain.

[0021]

As described above, according to the present invention, since the airbag is deployed while maintaining a predetermined shape along the occupant's chest, the occupant can be restrained in an optimal state. . Further, by adjusting the tension of the warp for sewing the two webbings accommodating the airbag, the airbag can be deployed at a desired timing.

[Brief description of the drawings]

FIG. 1 is a front view of a state where a seat belt device is expanded.

FIG. 2 is a configuration diagram of a seat belt device.

FIGS. 3A and 3B are cross-sectional views illustrating a main part of a third seatbelt in the seatbelt device. FIGS.

FIG. 4 is a sectional view of a third seat belt in the seat belt device.

FIG. 5 is an explanatory diagram of a sewing state of a webbing constituting a third seat belt.

FIG. 6A to FIG. 6C are explanatory views of a deployed state of the seat belt device.

FIG. 7 illustrates a third example of the seat belt device according to another embodiment.
It is sectional drawing of a seatbelt.

8A to 8C are explanatory views of a deployed state of the seatbelt device in another embodiment shown in FIG. 7;

[Explanation of symbols]

10: Vehicle 12: Driver's seat 14: Passenger's seat 16A, 16B
... Seat belt device 18a, 18b, 19a, 19b ... Retractor 20a, 20b ... Lumbar seat belt 24a, 24b
... Chest seat belt 26 ... Console box 28 ... Gas supply means 34a, 34b ... First seat belt 36a, 36b
... second seat belts 38a, 38b ... third seat belts 40, 42, 5
8, 60 webbing 44 airbag 46, 48 warp 50, 52, 54, 56 binding yarn

Claims (3)

[Claims] A first webbing disposed along an occupant's body in a seatbelt device for inflating an airbag stored in a seatbelt and detecting an occupant when an impact applied from the outside is detected; And a second webbing disposed in parallel with the first webbing, and a seat belt in which the first webbing and the second webbing are joined by sewing. The first webbing is joined to the second webbing, and a part of the other surface is joined to the second webbing.
An airbag housed between the webbing and the second webbing in a contracted state. 2. The apparatus according to claim 1, wherein the first webbing and the second webbing are arranged along both sides of the first webbing and the second webbing, and the first webbing is provided. And the warp, and the second webbing and the warp are sewn, respectively, so that the first
A webbing and a binding yarn that couples the second webbing. 3. The seat belt device according to claim 2, wherein the strength of the warp is adjusted so that the warp is cut at a preset tension.