JP2021169228A - Curtain airbag device - Google Patents

Abstract

To provide a curtain airbag device which can protect a head of an occupant properly even during a local lateral collision in which a vehicle collides with an obstacle having a relatively small width.SOLUTION: A curtain airbag device 1 has a curtain bag body which is deployed at the side of an occupant during a lateral collision of a vehicle and includes a recessed part 41 which is formed at the curtain bag body 4 and receives a headrest 71 when the curtain bag body 4 is deployed. The recessed part 41 hooks on the front end side of an outer edge as seen in a vehicle width direction of the headrest 71 and prevents movement of the curtain bag body 4 in a direction of the occupant.SELECTED DRAWING: Figure 6

Description

The present invention relates to a curtain airbag device.

It has a curtain bag that can be deployed along the side surface of the passenger compartment and an inflator that generates gas to inflate the curtain bag, and is arranged along the roof side rail that forms the skeleton of the vehicle body. A curtain airbag device is known (see, for example, Patent Document 1). When the curtain airbag device detects a side collision of the vehicle with a sensor, the inflator generates gas to expand and expand the curtain bag body downward, and the curtain bag body covers the windows and the like on the side surface of the vehicle.

Japanese Unexamined Patent Publication No. 2012-96628

By the way, in a local side collision that collides with a relatively narrow obstacle such as a standing tree or a utility pole, a part of the vehicle body is locally deformed and the shape of the side surface of the passenger compartment changes significantly. In some cases. In such a case, the curtain bag body is deployed along the side surface of the passenger compartment whose shape has changed. Therefore, if the vehicle body is deformed to the passenger compartment side in front of the occupant, the curtain bag body is normally on the occupant side. Although it should be deployed so as to extend substantially back and forth on the side, it may deviate from the intended deployment position, and it may be deployed in a state of being inclined diagonally forward and inward from the side of the occupant when viewed from above. In this unfolded state, the head of the occupant may come into contact with the curtain bag before the body, causing the head to rotate with respect to the body, which may worsen the injury value.

The present invention has been made in view of the above circumstances, and an object of the present invention is to accurately determine the head of an occupant even in the case of a local side collision that collides with a relatively narrow obstacle. The purpose is to provide a curtain airbag device that can be protected.

In order to achieve the above object, according to the present invention, a curtain airbag device having a curtain bag body deployed on the side of an occupant at the time of a side collision of a vehicle, which is formed on the curtain bag body and is formed on the curtain bag body. A curtain airbag device is provided with a recess that receives the headrest when the body is deployed.

The curtain airbag device may have a recess control unit that controls the formation and non-formation of the recess according to the state of a side collision of the vehicle.

In the curtain airbag device, the curtain bag body has a plurality of fixed portions arranged side by side in the front-rear direction and fixed to the vehicle body side, and at least one of the fixed portions is arranged on the front side of the headrest. The recess may be formed behind the front end of the vehicle width direction outer edge of the headrest.

In the curtain airbag device, in a plan view, the recess is a virtual circle centered on the fixed point adjacent to the front side of the headrest and passing through the front end of the outer edge in the vehicle width direction of the headrest, and behind the headrest. It may be formed so as to include an intersection with the inner surface of the curtain bag body in the vehicle width direction at the time of deployment.

In the curtain airbag device, the recess control unit may control the formation and non-formation of the recess based on a signal from the collision detection unit that detects the collision state of the vehicle.

According to the curtain airbag device of the present invention, the head of the occupant can be accurately protected even in a local side collision.

It is explanatory drawing of the side view which shows the state of the curtain airbag device at the time of non-deployment in the vehicle interior which shows one Embodiment of this invention. It is explanatory drawing of the side view which shows the deployed state of the curtain airbag device in a normal side collision. It is a control block diagram of a curtain airbag device. It is explanatory drawing of the plan view which shows the positional relationship between the curtain bag body in the unfolded state and a headrest at the time of non-collision. It is explanatory drawing of the plan view which shows the positional relationship between a curtain bag body in a deployed state and a headrest in a normal side collision. It is explanatory drawing of the side view which shows the deployed state of the curtain airbag device in a local side collision.

1 to 6 show an embodiment of the present invention, FIG. 1 is an explanatory view of a side view showing a state of the curtain airbag device when it is not deployed in the vehicle interior, and FIG. 2 is a side view of the curtain airbag device. A control block diagram, FIG. 3 is an explanatory side view showing the deployed state of the curtain airbag device in a normal side collision, and FIG. 4 is a plan view showing the positional relationship between the curtain bag body in the deployed state and the headrest in the non-collision state. 5 is an explanatory view in a plan view showing the positional relationship between the curtain bag body and the headrest in the deployed state in a normal side collision, and FIG. 6 is a side view showing the deployed state of the curtain airbag device in a local side collision. It is explanatory drawing of a visual figure.

As shown in FIG. 1, the curtain airbag device 1 is arranged along a roof side rail 2 that forms a skeleton portion of a vehicle body and extends substantially forward and backward. The curtain airbag device 1 includes a curtain bag body 4 that can be deployed so as to cover a window 3 on the side surface of the vehicle along a side surface portion of the vehicle interior, an inflator 5 that generates gas for expanding the curtain bag body 4. Has. The curtain bag body 4 is made of a sheet-like cloth material, and is formed into a long shape along the roof side rail 2 by being folded or rolled. The curtain bag body 4 is attached to the roof side rail 2 by a plurality of fixing tags 6. As shown in FIG. 1, the fixing tags 6 are arranged side by side in the front-rear direction on the upper side of the headrest 71 of the seat 7. As shown in FIG. 2, when gas is supplied from the inflator 5 to the curtain bag 4 at the time of a side collision of the vehicle, the curtain bag 4 expands and expands downward.

As shown in FIG. 3, the inflator 5 is connected to the pressure control unit 100 and generates gas based on a signal from the pressure control unit 100 to control the pressure of the gas in the curtain bag body 4. The pressure control unit 100 is connected to the collision detection unit 110 and determines the amount of gas generated by the inflator 5 according to the collision state of the vehicle. The collision detection unit 110 can be configured by, for example, an acceleration sensor, a camera, or the like provided in the vehicle. In the present embodiment, the pressure control unit 100 determines whether it is a normal side collision that collides with a relatively wide obstacle or a local side collision that collides with a relatively narrow obstacle, and locally. In the case of a side collision, the amount of gas generated by the inflator 5 is smaller than that of a normal side collision, and the pressure of the gas in the curtain bag 4 is lowered. In the present embodiment, the pressure control unit 100 reduces the amount of gas generated by the inflator 5 when it is determined that the vehicle collides with an obstacle, particularly in front of the occupant, among the local side collisions.

As shown in FIG. 4, the curtain bag body 4 is formed with a recess 41 that receives the headrest 71 when deployed. Further, the curtain bag body 4 is provided with a tether 42 that limits the expansion of the region where the recess 41 is formed and allows the expansion of the recess forming region when cut. In the present embodiment, the tether 42 is configured to extend in the vehicle width direction when deployed in the curtain bag 4 and can be cut by a tension acting in the longitudinal direction. The tether 42 is set so that it is not cut by the pressure of the gas supplied from the inflator 5 at the time of a local side collision, but is cut by the pressure of the gas supplied from the inflator 5 at the time of a normal side collision. That is, the pressure control unit 100, the inflator 5, and the tether 42 form a recess control unit that controls the formation and non-formation of the recess 41 according to the state of the side collision of the vehicle.

Further, the curtain bag body 4 has a plurality of fixed portions 43 fixed to the vehicle body side by each fixing tag 6. As shown in FIG. 4, the curtain bag body 4 is usually deployed so as to extend substantially forward and backward along a vehicle body extending substantially forward and backward. The recess 41 is formed behind the front end of the outer edge of the headrest 71 in the vehicle width direction. In the present embodiment, the recess 41 is a virtual circle C centered on a fixed portion 43 adjacent to the front side of the headrest 71 and passing through the front end of the outer edge of the headrest 71 in the vehicle width direction, and the rear side of the headrest 71 in a plan view. It is formed so as to include an intersection with the inner surface of the unfolded curtain bag 4 in the vehicle width direction. Here, when the seat 7 can be moved back and forth, it is ideal that this distance condition is satisfied in all the movable sections, but if this distance condition is satisfied in a part of the movable section. good. When the distance condition is satisfied in a part of the movable section, it is preferable that the distance condition is satisfied at least at the front end of the predetermined standard moving section in the movable section, and this distance is satisfied in all of the predetermined standard moving sections. It is more preferable to satisfy the conditions.

The operation of the curtain airbag device 1 configured as described above at the time of a side collision will be described.
When the collision detection unit 110 detects a side collision, the pressure control unit 100 determines whether it is a normal side collision or a local side collision. When it is determined that the collision is a normal side collision, the pressure control unit 100 generates an amount of gas corresponding to the normal side collision with the inflator 5. As a result, as shown in FIG. 2, the tether 42 is cut when the curtain bag body 4 is expanded, and the recess 41 is not formed in the expanded state. As shown in FIG. 5, in a normal side collision, the vehicle collides with an obstacle B having a relatively large width. Move in the direction. Therefore, the curtain bag body 4 is deployed so as to extend substantially back and forth on the side of the occupant.

On the other hand, in the case of a local side collision, since the vehicle collides with an obstacle having a relatively small width, a part of the vehicle body is locally deformed and the shape of the side surface of the vehicle interior is significantly changed. As shown in FIG. 6, if the vehicle body is deformed to the passenger interior side in front of the occupant, the vehicle body deviates from the intended deployment position shown in FIG. It will be expanded with. At this time, the head H of the occupant may come into contact with the curtain bag body 4 before the body portion.

When it is determined that such a local side collision occurs, the pressure control unit 100 generates a smaller amount of gas in the inflator 5 than in a normal side collision. As a result, the tether 42 is not cut when the curtain bag body 4 is expanded, and the recess 41 is formed in the expanded state. Therefore, as shown in FIG. 6, the recess 41 is caught on the front end side of the outer edge of the headrest 71 in the vehicle width direction, and the movement of the curtain bag 4 in the occupant direction is prevented. That is, the curtain bag body 4 does not come into contact with the occupant's head H, and the occupant's head H can be accurately protected even in a local side collision.

Further, in the present embodiment, since the recess 41 is formed behind the front end of the outer edge of the headrest 71 in the vehicle width direction, a sufficient distance between the curtain bag 4 and the occupant's head H is secured. .. In particular, since the recess 41 is formed so as to include the intersection of the above-mentioned virtual circle C and the inner surface of the curtain bag 4 in the vehicle width direction, the recess 41 does not come into contact with the occupant's head H. The 41 can be accurately hooked on the headrest 71.

In the above embodiment, the gas generation amount of the inflator 5 is controlled to increase the pressure in the curtain bag 4 to cut the tether 42, but for example, it operates only in a normal side collision. A second inflator may be provided to increase the pressure in the curtain bag 4 when the second inflator is activated. It is also possible, for example, to cut the tether 42 with a cutting tool connected to a piston driven by the gas of the second inflator.

Further, for example, without using a tether, the recess forming region in the curtain bag is partitioned from other regions, and the gas flows from the curtain bag into the recess forming region by the vent hole opened at a predetermined pressure or higher. It is also possible. Furthermore, for example, it is possible to configure the shape of the curtain bag 4 itself so that the pressure is increased by being pressed by the vehicle body when the vehicle body is deformed. In short, the formation and non-formation of the recess 41 may be controlled according to the state of the side collision of the vehicle. Furthermore, the recess 41 of the curtain bag 4 may be formed regardless of the collision conditions as long as all the various requirements at the time of a side collision required for the vehicle are satisfied.

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

1 Curtain airbag device 2 Roof side rail 3 Window 4 Curtain bag body 5 Inflator 6 Fixed tag 7 Seat 41 Recess 42 Tether 43 Fixed part 71 Headrest 100 Pressure control unit 110 Collision detection part B Obstacle C Virtual circle H Head

Claims (5)

A curtain airbag device having a curtain bag body that is deployed on the side of an occupant in the event of a side collision of a vehicle.
A curtain airbag device formed in the curtain bag body and provided with a recess for receiving a headrest when the curtain bag body is deployed. The curtain airbag device according to claim 1, further comprising a recess control unit that controls the formation and non-formation of the recess according to the state of a side collision of the vehicle. The curtain bag body has a plurality of fixed portions that are arranged side by side in the front-rear direction and fixed to the vehicle body side.
At least one of the fixed portions is arranged in front of the headrest.
The curtain airbag device according to claim 2, wherein the recess is formed behind the front end of the outer edge of the headrest in the vehicle width direction. In a plan view, the recess is a virtual circle centered on the fixed point adjacent to the front side of the headrest and passing through the front end of the outer edge in the vehicle width direction of the headrest, and the curtain bag body when deployed behind the headrest. The curtain airbag device according to claim 3, wherein the curtain airbag device is formed so as to include an intersection with an inner surface in the vehicle width direction of the vehicle. The curtain airbag device according to any one of claims 2 to 4, wherein the recess control unit controls the formation and non-formation of the recess based on a signal from a collision detection unit that detects a collision state of a vehicle. ..

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