JP4142478B2 - Leg airbag device structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a leg airbag device for protecting a leg.
[0002]
[Prior art]
Conventionally, in a vehicle such as a passenger car or a truck, an air bag is used to protect a driver or the like from an impact at the time of a vehicle collision.
However, conventional airbags are mainly used to protect the upper body of a driver or the like, and there is no airbag that effectively protects the legs of the driver or the like.
[0003]
On the other hand, for example, in a cab over type truck, since the space on the front side of the leg portion is relatively narrow, the leg portion may collide with the instrument panel, and the leg portion airbag device can effectively protect the leg portion. Is desired.
Conventionally, as such a leg airbag device, for example, one disclosed in Japanese Patent Application Laid-Open No. 2002-127863 is known.
[0004]
In this leg airbag device, a right foot airbag that protects the driver's right foot and a left foot airbag that protects the left foot are arranged on the instrument panel disposed in front of the driver's seat of the vehicle. It is configured.
In this leg airbag device, the right leg is protected by the right leg airbag and the left leg is protected by the left leg airbag, so that the leg of the driver can be effectively protected.
[0005]
That is, for example, when trying to protect the right foot and the left foot at the same time with one airbag, it is difficult to reliably protect both feet due to reasons such as the right foot and the left foot being separated at the time of collision, Since the right foot and the left foot are protected by independent airbags, the right foot and the left foot can be reliably protected.
In addition, when trying to protect the right and left feet simultaneously with a single airbag, the size of the airbag increases, making it difficult to effectively protect the right and left feet at different positions. Since the right leg and the left leg are protected by independent air bags, the right leg and the left leg can be effectively and reliably protected.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-127863
[Problems to be solved by the invention]
However, in the above-described leg airbag device, the right foot airbag 2 is disposed on the right side of the column cover 1 and the left foot airbag 3 is disposed on the left side, as shown in FIG. As shown by a two-dot chain line when the second and third deployments are performed, the right foot airbag 2 directly collides with the key 5 attached to the key portion 4 of the column cover 1 and the vicinity thereof, and the key holder attached to the key 5 There was a problem that there was a possibility that it could not be protected.
[0008]
The present invention has been made in view of the above points, and provides a structure of a leg airbag device capable of easily and reliably preventing an airbag from directly colliding with a key attached to a key portion and its vicinity. The purpose is to do.
[0009]
[Means for Solving the Problems]
The structure of the leg airbag device according to claim 1 is the structure of the leg airbag device in which the airbag device for the leg is accommodated at a position on the front side of the key portion of the column cover in the instrument panel. the instrument panel, when the folded state airbag deployment, Ri said airbag name by arranging the deployment direction regulating member for preventing the collision with the key and its vicinity is attached to the key unit, the developing direction The restricting member includes a projecting portion that is formed to project in a wall shape from a part of the instrument panel when the airbag is not deployed and deployed .
[0011]
(Function)
In the structure of the leg airbag device according to the first aspect, when the airbag is deployed, a predetermined position of the instrument panel is broken and the airbag projects from the instrument panel.
When the folded airbag is deployed, the deployment direction regulating member disposed on the instrument panel regulates the deployment direction of the airbag, and the airbag directly collides with the key attached to the key portion and the vicinity thereof. It is prevented.
[0012]
Therefore, when the airbag is deployed, the key holder of the key attached to the key portion is protected.
In addition, the deployment direction of the airbag is regulated by a deployment direction regulating member composed of a projecting portion that projects from a part of the instrument panel in a wall shape, so that the airbag is attached to the key portion and the vicinity thereof. Direct collision is prevented.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
(First embodiment)
FIG. 1 shows a first embodiment of the structure of the leg airbag device of the present invention, and FIG. 2 shows the inside of a cab of a cab-over type truck to which this embodiment is applied.
In FIG. 2, a driver's seat 15 serving as a driver's 13 seat is disposed inside a cab (not shown).
[0016]
A handle 17 is disposed in front of the driver seat 15, and a handle shaft is inserted into the column cover 19.
An instrument panel 21 is disposed in front of the driver seat 15.
Various instruments such as a speedometer (not shown) are arranged on the top of the instrument panel 21.
[0017]
In this embodiment, as shown in FIG. 1, a right foot airbag device 27 for protecting the right foot 13 a of the driver 13 and a left foot 13 b are provided inside a front surface 25 (hereinafter referred to as an instrument surface) of the instrument panel 21. A left foot airbag device 29 for protecting the vehicle is disposed.
That is, inside the instrument surface 25 of the instrument panel 21, as shown in FIG. 3, a rectangular cylindrical holding member 35 is integrally formed so as to protrude inward.
[0018]
The base plate 31 is inserted into the holding member 35.
FIG. 3 shows a state where the airbag 37 is deployed.
And as shown in FIG. 1, the airbag 37 is accommodated in the space between the baseplate 31 and the instrument surface 25 in the folded state.
In this embodiment, the instrument surface 25 is made of a soft resin, and a not-shown cut portion for facilitating breakage of the instrument surface 25 is formed inside the center of the recess 39.
[0019]
In this embodiment, as shown in FIG. 4, the airbag 37 of the right foot airbag device 27 and the left foot airbag device 29 is provided between the right foot airbag device 27 and the left foot airbag device 29. A first inflator 45 and a second inflator 47 for expanding are arranged.
The first inflator 45 and the second inflator 47 have a long shape, and the longitudinal direction is arranged in a direction perpendicular to the traveling direction of the vehicle, in this embodiment, in the horizontal direction.
[0020]
The first inflator 45 and the second inflator 47 are arranged in series on both sides of the chamber 49.
In this embodiment, the first inflator 45 and the second inflator 47 are connected to the airbag 37 of the right foot airbag device 27 and the left foot airbag device 29 via the pipe 51.
[0021]
That is, on the back side of the first inflator 45 and the second inflator 47, the pipe 51 that opens to the chamber 49 is disposed substantially parallel to the first inflator 45 and the second inflator 47.
Then, both sides of the pipe 51 are bent downward, and the ends of the bent portions 53 are connected to the base plate 31 of the right foot airbag device 27 and the left foot airbag device 29.
[0022]
In this embodiment, as shown in FIG. 1, the right foot airbag device 27 is arranged on the front side of the key portion 55 of the column cover 19 in the instrument panel 21.
The instrument panel 21 is provided with a deployment direction regulating member that prevents the airbag 37 from colliding with the key 57 attached to the key portion 55 and the vicinity thereof when the airbag 37 in a folded state is deployed. Yes.
[0023]
In this embodiment, the deployment direction regulating member includes a projecting portion 59 that is formed on a part of the instrument panel 21 so as to project in a wall shape.
In this embodiment, the protrusion 59 is integrally formed with the instrument panel 21.
The root portion of the protruding portion 59 is positioned in the vicinity of the column cover 19, and the tip portion extends to the side of the key portion 55.
[0024]
In the above-described leg airbag device, the igniters of the first inflator 45 and the second inflator 47 are ignited by a signal from an acceleration sensor (not shown) when the vehicle collides, and the first inflator 45 and the second inflator 45 Gas is generated by combustion of the gas generating agent in the inflator 47.
The generated gas flows into the pipe 51 from the chamber 49 and is divided into a right side and a left side, and then passes through the bent portion 53 from the base plate 31 of the right foot airbag device 27 and the left foot airbag device 29. The air bag 37 flows into the air bag 37, whereby the air bag 37 is inflated rapidly.
[0025]
Due to the inflation of the airbag 37, the instrument surface 25 is broken from a not-shown cut portion, and the airbag 37 protrudes toward the knees 13 a and 13 b of the driver 13, whereby the right foot 13 a and the left foot 13 b of the driver 13 are Securely protected.
In the structure of the leg airbag device described above, when the airbag 37 of the right foot airbag device 27 is deployed, the deployment direction of the airbag 37 is a part of the instrument panel 21 as shown in FIG. The air bag 37 is regulated by a projecting portion 59 formed so as to project in a wall shape, and the air bag 37 is prevented from directly colliding with a key 57 and a key holder 61 (shown in FIG. 2) attached to the key portion 55.
[0026]
Accordingly, when the airbag 37 is deployed, the key holder 61 of the key 57 attached to the key portion 55 is protected, and safety can be improved.
In addition, although this embodiment demonstrated the example which formed the protrusion part 59 integrally in the instrument panel 21, this invention is not limited to this embodiment, For example, a protrusion part is formed by another member. Also good.
[0027]
(Second Embodiment)
6 and 7 show a state when the airbag 37 is deployed in the second embodiment of the structure of the leg airbag device of the present invention.
In this embodiment, members having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0028]
In this embodiment, the deployment direction of the airbag 37 is regulated by the door-shaped portion 63 formed on the instrument panel 21 by the partial breakage of the instrument panel 21 when the airbag 37 is deployed.
That is, in this embodiment, as shown in FIG. 8 and FIG. 9, the first side of the instrument panel 21 is located on the back side of the instrument panel 21 at the position inside the holding portion 35 in which the airbag 37 is accommodated. A concave groove 25a and a second concave groove 25b are formed.
[0029]
The first concave groove 25 a is formed in a T shape on the inner center of the holding portion 35 and on the side opposite to the column cover 19, and is formed to a depth that breaks when the airbag 37 is deployed.
The second concave groove 25b is formed in the vertical direction on the column cover 19 side, and is formed to such a depth that it is bent without breaking when the airbag 37 is deployed.
[0030]
That is, the groove depth of the second groove 25b is sufficiently shallower than that of the first groove 25a.
Accordingly, when the airbag 37 is deployed, the first concave groove 25a of the instrument surface 25 is broken and the second concave groove 25b is bent to form the door-shaped portion 63 as shown in FIGS. Will be.
[0031]
In this embodiment, the deployment direction of the airbag 37 is regulated by the door-shaped portion 63 formed on the instrument panel 21 by the partial breakage of the instrument panel 21 when the airbag 37 is deployed.
Accordingly, it is possible to easily and reliably prevent the airbag 37 from directly colliding with the key 57 attached to the key portion 55 and the vicinity thereof.
[0032]
In the above-described embodiment, an example in which the present invention is applied to a cab-over type truck has been described. However, the present invention is not limited to such an embodiment, and can be widely applied to vehicles such as buses and passenger cars. .
[0033]
【The invention's effect】
As described above, in the structure of the leg airbag device according to claim 1, the deployment direction for preventing the airbag from colliding with the key attached to the key portion and the vicinity thereof when the folded airbag is deployed. Since the restricting member is arranged on the instrument panel, it is possible to easily and surely prevent the airbag from directly colliding with the key attached to the key portion and the vicinity thereof, and thereby the key attached to the key portion. It is possible to protect the key holder and the like.
[0034]
In addition, since the deployment direction of the airbag is regulated by a deployment direction regulating member formed of a projecting portion that projects from a part of the instrument panel in a wall shape, the key that the airbag is attached to the key portion and facilitate the direct collision near the Ru can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a first embodiment of a structure of a leg airbag device of the present invention.
FIG. 2 is an explanatory view showing the inside of a cab of a cab over type truck to which the structure of the leg airbag device of FIG. 1 is applied.
FIG. 3 is an explanatory view showing, in a longitudinal section, a housing part of the airbag of FIG. 1;
4 is an explanatory view showing a pipeline system of the leg airbag device of FIG. 1. FIG.
5 is an explanatory view showing a state when the airbag having the structure of the leg airbag device in FIG. 1 is deployed. FIG.
FIG. 6 is an explanatory view showing a second embodiment of the structure of the leg airbag device of the present invention as viewed from above.
7 is an explanatory view showing the structure of the leg airbag device of FIG. 6 as viewed from the side.
8 is an explanatory view showing the main part of the structure of the leg airbag device of FIG. 6 as seen from the front.
9 is an explanatory view showing in cross section the main part of the structure of the leg airbag device shown in FIG. 6;
FIG. 10 is an explanatory view showing a conventional leg airbag device.
[Explanation of symbols]
19 Column cover 21 Instrument panel 27 Air bag device for right foot 29 Air bag device for left foot 37 Air bag 55 Key portion 57 Key 59 Protruding portion 63 Door-shaped portion

Claims (1)

In the structure of the leg airbag device that accommodates the leg airbag device at a position on the front side of the key portion of the column cover in the instrument panel,
The instrument panel, when folded into the state airbag deployment, Ri said airbag name by arranging the deployment direction regulating member for preventing the collision with the key and its vicinity is attached to the key unit, the expansion A structure of a leg airbag device , wherein the direction regulating member includes a projecting portion formed to project in a wall shape at a part of the instrument panel when the airbag is not deployed and deployed .

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