JP6274078B2 - Curtain airbag device for vehicle - Google Patents

Description

  The present invention relates to a curtain airbag device for a vehicle.

  2. Description of the Related Art A vehicle curtain airbag device that is inflated and deployed in a curtain shape along a side window glass at the time of a vehicle side collision is known. In such a curtain airbag device for a vehicle, Patent Document 1 discloses a curtain airbag in which an additional chamber (sub-chamber) is provided on the vehicle front side of a main chamber (main chamber). The upper edge of the main chamber and the lower edge of the additional chamber are connected by a tension strap, and the tension strap is configured to pull the additional chamber inward in the vehicle width direction when the main chamber and the additional chamber are expanded and deployed. Yes. Thereby, at the time of the diagonal collision of the vehicle or the minute lap collision, the occupant's head that has moved inertially diagonally forward is intended to be restrained.

JP 2014-501205 A

  However, in a configuration in which the upper edge of the main chamber and the lower edge of the additional chamber are simply connected with a tension strap, the additional chamber may move when the occupant's head contacts the additional chamber. For this reason, there is room for improvement from the viewpoint of improving the occupant's head restraint performance.

  An object of the present invention is to obtain a curtain airbag device for a vehicle that can improve the head restraint performance of the occupant when the occupant's head is inertially moved obliquely forward of the vehicle.

A curtain airbag device for a vehicle according to a first aspect of the present invention includes a main chamber that expands in a curtain shape along a side window glass by the pressure of a gas generated from an inflator, and a vehicle front side of the main chamber. A sub-chamber that is formed and expands by the pressure of the gas supplied from the main chamber, and is partially partitioned from the main chamber by a non-expanding portion that extends obliquely forward and upward of the vehicle; One end portion in the longitudinal direction is attached to the upper end portion of the main chamber or the roof side portion located above the vehicle, and the middle portion in the longitudinal direction is passed through a slit formed in the non-expandable portion, The other end in the direction extends along the inner surface of the sub chamber in the vehicle width direction and is attached to the lower portion of the sub chamber. Possess a member, one longitudinal end side of the slit of the tension member is disposed in the vehicle width direction outer side of the main chamber.

  In the curtain airbag device for a vehicle according to the first aspect of the present invention, a main chamber is provided which expands in a curtain shape along the side window by the pressure of the gas generated from the inflator. Further, a sub chamber is provided on the vehicle front side of the main chamber, and the sub chamber is partially partitioned from the main chamber by a non-expanding portion that extends obliquely forward and upward of the vehicle. . Here, a slit is formed in the non-expanded portion, and a longitudinal intermediate portion of the elongated tensile member is passed through the slit. And the longitudinal direction one end part of the tension member is attached to the upper end part of the main chamber or the roof side part located above the vehicle, and the longitudinal direction other end side of the tension member is inside the vehicle width direction of the sub chamber. It extends along the surface and is attached to the lower part of the subchamber. As a result, when the head of the occupant is inertially moved forward in the oblique direction of the vehicle at the time of the vehicle oblique collision or minute lap collision, the head slides forward while pushing the main chamber outward in the vehicle width direction. Is pulled and moves inward in the vehicle width direction so as to wrap around the head so that the sub chamber wraps around the head of the occupant. In this way, the passenger's head can be effectively restrained.

  Further, when the length of the tension member is set short, a tension acts on the tension member as the main chamber expands. Accordingly, the lower portion of the sub chamber is pulled inward in the vehicle width direction by the tension member, and the sub chamber can be arranged on the inner side in the vehicle width direction than the main chamber in the inflated and deployed state. As a result, it is possible to prevent or suppress the passenger's head from coming into contact with the front pillar or the instrument panel. Furthermore, since the non-inflatable portion extends obliquely forward and upward of the vehicle, the sub-chamber can be disposed so as to restrain from the front with respect to the movement trajectory of the occupant's head at the time of the collision.

Furthermore, when a passenger | crew's head contacts and slides on a main chamber at the time of a vehicle collision, it can prevent or suppress that this head interferes with a tension member.

A curtain airbag device for a vehicle according to a second aspect of the present invention includes a main chamber that expands in a curtain shape along a side window glass by the pressure of a gas generated from an inflator, and a vehicle front side of the main chamber. A sub-chamber that is formed and expands by the pressure of the gas supplied from the main chamber, and is partially partitioned from the main chamber by a non-expanding portion that extends obliquely forward and upward of the vehicle; One end portion in the longitudinal direction is attached to the upper end portion of the main chamber or the roof side portion located above the vehicle, and the middle portion in the longitudinal direction is passed through a slit formed in the non-expandable portion, The other end in the direction extends along the inner surface of the sub chamber in the vehicle width direction and is attached to the lower portion of the sub chamber. Includes a member, the said and the non-inflatable portion is two slits are provided, the longitudinally intermediate portion of the tension member is threaded through two of said slits.

In the curtain airbag device for a vehicle according to the second aspect of the present invention, when the non-inflatable portion is pushed outward in the vehicle width direction by the head of the occupant who has moved inertially forward of the vehicle, the base fabric between the slits Moves outward in the vehicle width direction and pulls the tension member. As a result, the main chamber and the sub chamber can be bent starting from the base cloth between the slits to protect the occupant's head.

A curtain airbag device for a vehicle according to a third aspect of the present invention is the curtain air bag device according to the first or second aspect , wherein the main chamber is accommodated in the roof side portion and is at least the tension member. The bellows are folded at the portion where the member is disposed.

In the curtain airbag device for a vehicle according to the third aspect of the present invention, for example, when the length of the tension member is formed short so that the tension is effectively applied when the main chamber is inflated and deployed, the tension in the main chamber is reduced. The portion where the member is arranged becomes relatively long. Even in such a case, it is possible to satisfactorily accommodate the roof side portion by folding the main chamber at least in the portion where the tension member is disposed.

According to a fourth aspect of the present invention, there is provided a vehicular curtain airbag device according to any one of the first to third aspects, wherein the main chamber is disposed above the non-inflatable portion. And a gas flow path communicating with the sub-chamber, and a seam portion is provided in a part of the gas flow path.

In the curtain airbag device for a vehicle according to the fourth aspect of the present invention, the seam portion is provided in a part of the gas flow path, so that the cross-sectional area of the gas flow path at the time of inflation and deployment is reduced. Resistance at the time of bending (moving) inward in the vehicle width direction can be reduced.

A curtain airbag device for a vehicle according to a fifth aspect of the present invention is the curtain air bag device according to any one of the first to fourth aspects, wherein the sub-chamber is more inflated and deployed than the main chamber. It is arrange | positioned at the vehicle width direction inner side, and is contacting the instrument panel.

In the curtain airbag device for a vehicle according to the fifth aspect of the present invention, when the head of the occupant moves inertially toward the instrument panel, the sub-chamber is sandwiched between the head and the instrument panel. It is. And a subchamber can take a reaction force on an instrument panel, and can restrain a crew member's head.

As described above, according to the first and second aspects of the invention, the occupant's head restraint performance when the occupant's head is inertially moved diagonally forward of the vehicle can be improved. Has an effect.

According to the first aspect of the invention, when the head of the occupant comes into contact with the main chamber, there is an excellent effect that the tension can be surely applied to the tension member.

According to the second aspect of the present invention, even when the passenger's head is not in contact with the main chamber and is in contact with the non-inflatable portion, it is possible to effectively apply tension to the tension member. Has an effect.

According to the invention which concerns on Claim 3 , even when the length of a tension | pulling member is shortened, it has the outstanding effect that an accommodation state can be maintained favorable.

According to the invention which concerns on Claim 4 , it has the outstanding effect that a subchamber can be bent (moved) smoothly inside a vehicle width direction.

According to the invention which concerns on Claim 5 , it has the outstanding effect that the passenger | crew's head which moved inertially toward the instrument panel can be restrained effectively.

It is a plane sectional view showing typically the front part of the vehicle to which the curtain airbag device for vehicles concerning a 1st embodiment was applied, and is a figure showing the operating state of a curtain airbag. It is the side view which shows typically the front part of the vehicle to which the curtain airbag device for vehicles which concerns on 1st Embodiment was applied, and is the figure seen from the vehicle width direction outer side. It is the side view which looked at the front part of the curtain airbag which constitutes the curtain airbag device for vehicles concerning a 1st embodiment from the vehicle width direction outside, and is a figure showing the unfolded state extended flat. It is a plane sectional view showing the state where the crew's head was wrapped and wrapped with the curtain airbag which constitutes the curtain airbag device for vehicles concerning a 1st embodiment. It is a plane sectional view showing typically the state where the curtain airbag which constitutes the curtain airbag device for vehicles concerning a 1st embodiment was folded. It is a side view corresponding to Drawing 3 showing the front part of the curtain airbag concerning a 2nd embodiment. It is an expanded sectional view which expands and shows the cut surface cut | disconnected by the 7-7 line | wire of FIG. It is a side view corresponding to Drawing 3 showing the front part of the curtain airbag concerning a 3rd embodiment.

<First Embodiment>
A curtain airbag device for a vehicle according to a first embodiment of the present invention will be described with reference to FIGS. It should be noted that arrows FR, UP, and OUT, which are appropriately shown in the drawings, respectively indicate the front direction, the upward direction, and the vehicle width direction outside of the vehicle to which the vehicle curtain airbag device is applied. Hereinafter, when the description is made simply using the front-rear direction and the up-down direction, the front-rear direction of the vehicle and the up-down direction of the vehicle are indicated unless otherwise specified.

  FIG. 1 is a plan view showing a part of the interior of a vehicle 12 to which a vehicle curtain airbag device 10 (hereinafter simply referred to as “curtain airbag device 10”) is applied. 2, a part of the vehicle 12 is shown in a side view as viewed from the outside of the vehicle. As shown in these drawings, the vehicle 12 is provided with a driver's seat airbag device 14 and a curtain airbag device 10.

(Configuration of driver airbag device)
The driver seat airbag device 14 includes a front collision airbag 18 that is deployed behind the steering wheel 16. The front airbag 18 is housed in the wheel pad of the steering wheel 16 together with the inflator 19 in a folded state. The front-impact airbag 18 is supplied with gas from the inflator 19 when the inflator 19 is operated, and between the steering wheel 16 and the driver's seat occupant P (hereinafter simply referred to as “occupant P”). Inflated and deployed. The inflator 19 of the driver's seat airbag device 14 is actuated at the time of a frontal collision of the vehicle 12, a minute lap collision, and an oblique collision. In addition, the collision forms of the minute lap collision and the oblique collision will be described later.

(Configuration of curtain airbag device)
As shown in FIG. 2, the curtain airbag device 10 includes a curtain airbag 20 and an inflator 22 that is a gas supply device. The curtain airbag 20 is formed so as to be deployed in a curtain shape along the side window glass 24 (see FIG. 1). Further, the curtain airbag 20 of the present embodiment covers a part of the front and rear side window glasses 24 and pillars (front pillar 28, center pillar 26, rear pillar not shown) located on the sides of the front seat and the rear seat. It is configured. 1 and 2 mainly illustrate the front portion of the curtain airbag 20.

  In the non-operating state, the curtain airbag 20 is, for example, rolled or accordion-folded to have a long shape, and is accommodated from the front pillar (A pillar) 28 to the roof side portion 29 to the vicinity of the rear pillar. Yes. The roof side portion 29 in this embodiment forms the upper edge of the front and rear door opening as an opening for getting on and off surrounded by the roof side portion 29, the front pillar 28, and the center pillar 26 and a rear pillar and a rocker (not shown). ing.

  More specifically, the curtain airbag 20 is accommodated between a roof side rail constituting the roof side portion 29 and a roof head lining, and between the front pillar 28 and the pillar garnish. A part of the curtain airbag 20 on the front end side may be folded or folded inward in the vehicle width direction and accommodated in the roof front end portion or in the roof side portion 29. Moreover, the accommodation state of the subchamber 20S which comprises a part of curtain airbag 20 is mentioned later.

  The curtain airbag 20 is supplied with gas from the inflator 22 when the inflator 22 is actuated, and is deployed along the front and rear side window glasses 24 and the center pillar 26, and the head of the passenger P in the front seat and the rear seat. The part H is configured to be protected. Specifically, the inflator 22 employs a combustion type or a cold gas type, and supplies the gas generated by being operated into the curtain airbag 20. The gas outlet of the inflator 22 communicates with the interior of the curtain airbag 20. In this embodiment, the inflator 22 is disposed above the center pillar 26 in the roof side portion 29. The shape of the curtain airbag 20 will be described later.

  The curtain airbag device 10 described above is provided on the roof side portions 29 and the like on both sides of the vehicle 12 in the vehicle width direction. That is, although the illustration and detailed description are omitted, a similar curtain airbag device is also provided on the passenger seat side.

  Further, the vehicle 12 is provided with an airbag ECU 34 as a control device. The airbag ECU 34 is electrically connected to a plurality of collision sensors and rollover sensors (not shown). This airbag ECU 34 is based on the information from each collision sensor and rollover sensor, and the frontal collision, the side collision, the rollover, the minute lap collision, and the diagonal collision (occurrence or inevitable) with respect to the applied vehicle 12. Can be detected.

  Here, the micro lap collision is a collision in which the lap amount in the vehicle width direction with the collision partner prescribed by IIHS is 25% or less among the front collision of the vehicle 12. For example, a collision to the outside in the vehicle width direction with respect to a front side member that is a vehicle body skeleton corresponds to a minute lap collision. In this embodiment, a minute lap collision at a relative speed of 64 km / hr is assumed as an example. Further, the oblique collision is defined as, for example, an oblique front defined by NHTSA (for example, a collision with a relative angle of 15 ° with the collision partner and a lap amount of about 35% in the vehicle width direction). In this embodiment, an oblique collision at a relative speed of 90 km / hr is assumed as an example.

  The airbag ECU 34 operates the inflator 19 of the driver airbag device 14 when a frontal collision is detected. The airbag ECU 34 operates the inflator 22 of the curtain airbag device 10 when a side collision or rollover is detected. Furthermore, the airbag ECU 34 operates the inflator 19 of the driver's seat airbag device 14 and the inflator 22 of the curtain airbag device 10 when detecting a minute lap collision or an oblique collision.

(Configuration of curtain airbag front)
Next, the detail of the front part of the curtain airbag 20 which concerns on this embodiment is demonstrated. The front part of the curtain airbag 20 includes a main chamber 20M that mainly protects the head H of the occupant P against side collisions and rollovers, and a sub-chamber 20S that is formed on the vehicle front side of the main chamber 20M and is inflated and deployed. And a tether 30 as a tension member.

  In FIG. 3, the front portion of the curtain airbag 20 is shown in a side view. As shown in this figure, the sub-chamber 20S constituting the curtain airbag 20 is formed integrally with the main chamber 20M so as to communicate with the main chamber 20M on the upper end side. A gas flow path 20F is provided between the main chamber 20M and the sub chamber 20S. Here, since the sub-chamber 20S communicates with the main chamber 20M through the gas flow path 20F, the sub-chamber 20S is configured to expand with the pressure of the gas supplied from the main chamber 20M through the gas flow path 20F.

  In addition, a non-expandable portion 32 through which no gas flows is disposed between the main chamber 20M and the sub-chamber 20S, and the main chamber 20M and the subchamber 20S are partially partitioned by the non-expandable portion 32. Yes. The non-expanding portion 32 extends obliquely from the front lower end of the main chamber 20M to the front of the vehicle and above the vehicle, and a gas flow path 20F is provided on the extension of the non-expanding portion 32.

  Here, a slit 32A is formed in the non-inflatable portion 32, and a long tether 30 is inserted through the slit 32A. The tether 30 extends obliquely in the vehicle front-rear direction with respect to the vehicle up-down direction, and a tether intermediate portion 30E located at a substantially intermediate portion in the longitudinal direction of the tether 30 is inserted into the slit 32A. A tether upper portion 30A on the upper side (one longitudinal side) of the slit 32A extends along the vehicle width direction outer side of the main chamber 20M. The tether upper end 30B positioned at the upper end (longitudinal end) of the tether 30 is sewn (attached) to the upper edge (upper end) of the main chamber 20M. The tether upper end 30B may be attached to the roof side 29 of the vehicle 12, and may be fastened to the fastening point 31 between the roof side rail and the curtain airbag 20, for example.

  On the other hand, the tether lower part 30C located on the lower side (the other end side in the longitudinal direction) than the slit 32A extends along the inner surface in the vehicle width direction of the sub chamber 20S. A tether lower end 30D located at the lower end (the other end in the longitudinal direction) of the tether 30 is sewn (attached) to the lower edge (lower end) of the subchamber 20S.

  Here, in this embodiment, the length of the tether 30 is set to a length at which tension acts as the curtain airbag 20 is inflated. For this reason, in the state immediately after the curtain airbag 20 is deployed, the main chamber 20M and the sub-chamber 20S are arranged in the vehicle front-rear direction, as indicated by a two-dot chain line in FIG. As the main chamber 20M expands, tension is applied to the tether 30 and the lower portion of the sub-chamber 20S is pulled, so that the sub-chamber 20S starts from the non-expanded portion 32 as shown in FIG. It is bent (moved) inward. Here, the sub-chamber 20S is inflated and deployed so as to cover the front pillar 28 and the outer ends of the instrument panel 36 in the vehicle width direction when viewed from the passenger P. The subchamber 20S is configured to be inflated and deployed on the front side of the vehicle with respect to the front collision airbag 18 (steering wheel 16).

  Further, as shown in FIG. 5, the main chamber 20M housed in the roof side portion 29 is bellows-folded (Z-folded) at least at a portion where the tether 30 is disposed. For this reason, even when the length of the tether 30 is formed short in order to effectively apply tension when the main chamber 20M is inflated and deployed as described above, the portion of the main chamber 20M where the tether 30 is disposed is arranged. It can be satisfactorily accommodated in the roof side portion 29.

(Action and effect)
Hereinafter, the operation and effect of the curtain airbag device 10 according to the present embodiment when the airbag ECU 34 determines that the vehicle 12 has collided slightly will be described.

  As shown in FIG. 2, when the airbag ECU 34 determines that the host vehicle has made a minute lap collision based on signals from the respective collision sensors, the airbag ECU 34 of the driver seat airbag device 14 and the curtain airbag device 10 The inflator 22 is activated. Then, the front airbag 18 is supplied with gas from the inflator 19 and is inflated and deployed in front of the passenger P and above and behind the steering wheel 16.

  The curtain airbag 20 is supplied with gas from the inflator 22, and the main chamber 20 </ b> M is deployed along the side window glass 24 in a curtain shape. Further, the sub-chamber 20S that has been supplied with the gas from the inflator 22 is expanded and deployed through the main chamber 20M. Here, as shown in FIG. 1, the sub-chamber 20S is arranged along the side window glass 24 together with the main chamber 20M in a state immediately after deployment (state of a two-dot chain line in the figure). When the tension is applied to the tether 30 as it expands, it is pulled inward in the vehicle width direction. Accordingly, it is possible to suppress the sub-chamber 20S from interfering with peripheral components as compared with a configuration in which the sub-chamber 20S is deployed while being pulled inward in the vehicle width direction.

  By the way, at the time of the minute lap collision, the occupant P moves forward with respect to the vehicle body and further moves outward in the vehicle width direction. That is, the head H of the passenger P moves so as to slide forward of the vehicle while pushing the main chamber 20M outward in the vehicle width direction. For this reason, the head H of the occupant P may enter between the front impact airbag 18 and the main chamber 20M of the curtain airbag 20.

  Here, in the present embodiment, the sub-chamber 20S is pulled by the tether 30 and arranged on the inner side in the vehicle width direction, so that the head H of the occupant P is temporarily located between the front airbag 18 and the main chamber 20M. Even when the head H is slipped through, the head H can be prevented or suppressed from contacting the front pillar 28, the instrument panel 36, or the like. When the sub-chamber 20S in contact with the head H is pressed against the instrument panel 36 (front pillar 28), the sub-chamber 20S takes a reaction force on the instrument panel 36 and restrains the head H. The collision energy can be absorbed.

  Further, since the head H of the occupant P slides forward of the vehicle while pushing the main chamber 20M outward in the vehicle width direction, the tension member is pulled, so that the sub-chamber 20S has the head of the occupant P as shown in FIG. Wrap around part H and wrap around head H. In this way, the head H can be effectively restrained. Further, since the upper portion 30A of the tether extends along the vehicle width direction outer side of the main chamber 20M, even if the head H of the occupant P is in contact with the main chamber 20M, the head H is connected to the tether 30. Interference can be prevented or suppressed.

  Further, as shown in FIG. 2, the non-inflatable portion 32 extends obliquely forward and upward of the vehicle. For this reason, the sub-chamber 20S bent in the vehicle width direction starting from the non-inflatable portion 32 is restrained from the front with respect to the movement locus L of the head H of the occupant P wearing the three-point seat belt at the time of the collision. To be arranged. Thereby, the head H of the passenger | crew P can be protected reliably.

  When the airbag ECU 34 determines that the host vehicle has collided obliquely based on the signals from the respective collision sensors, the airbag ECU 34 operates the inflator 19 of the driver airbag device 14 and the inflator 22 of the curtain airbag device 10. In the oblique collision, the occupant P moves linearly forward and outward in the vehicle width direction. Even in this case, the sub-chamber 20S moves inward in the vehicle width direction as in the case of the minute lap collision, so that the head H of the occupant P is prevented from contacting the front pillar 28, the instrument panel 36, or the like. Can be suppressed.

  In the present embodiment, a gap is provided between the sub-chamber 20S and the instrument panel 36. However, the present invention is not limited to this, and the sub-chamber 20S is brought into contact with the instrument panel 36 in an inflated and deployed state. Also good. At this time, when the head H of the occupant P moves inertially toward the instrument panel 36, the sub-chamber 20S is sandwiched between the head H and the instrument panel 36. As a result, the sub-chamber 20S can restrain the head H of the occupant P by applying a reaction force to the instrument panel 36.

  In the present embodiment, the tension is applied to the tether 30 as the main chamber 20M expands, and the sub-chamber 20S is bent inwardly in the vehicle width direction starting from the non-expandable portion 32. It is not limited to this. For example, the length of the tether 30 may be set to a length that eliminates the slack of the tether 30 in the inflated and deployed state of the curtain airbag 20. In this case, in the inflated and deployed state of the curtain airbag 20, the subchamber 20S is disposed at a position indicated by a two-dot chain line in FIG. And it is good also as a structure which tension | tensile_strength acts on the tether 30 and pulls the lower part of the subchamber 20S by the main chamber 20M being pushed to the vehicle width direction outer side by the passenger | crew's P head H.

Second Embodiment
Next, a curtain airbag device for a vehicle according to a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, since the configuration is the same as that of the first embodiment except for the curtain airbag 52, only the configuration of the curtain airbag 52 will be described.

  As shown in FIG. 6, the curtain airbag 52 constituting a part of the vehicle curtain airbag device 50 of the present embodiment mainly protects the head H of the occupant P against side collision and rollover. It includes a chamber 52M, a sub-chamber 52S formed on the vehicle front side of the main chamber 52M and inflated and deployed, and a tether 56 as a tension member.

  Here, the sub chamber 52S is formed integrally with the main chamber 52M so as to communicate with the main chamber 52M on the upper end side, and a gas flow path 52F is provided between the main chamber 52M and the sub chamber 52S. ing. Further, the main chamber 52M and the sub-chamber 52S are partially partitioned by a non-expanding portion 54 through which no gas flows.

  The non-expanding portion 54 extends obliquely from the front lower end portion of the main chamber 52M toward the front of the vehicle and above the vehicle, and a gas flow path 52F is provided on the extension of the non-expanding portion 54. Here, in this embodiment, two slits 54A and a slit 54B are formed in the non-expandable portion 54, and a long tether 56 is inserted through the slit 54A and the slit 54B in order.

  The tether 56 extends obliquely with respect to the vehicle vertical direction, and a tether intermediate portion 56E, which is a middle portion in the longitudinal direction of the tether 56, is located outside the non-inflatable portion 54 in the vehicle width direction, as shown in FIG. It is arranged on the outer side in the vehicle width direction of the base fabric 54C between the slit 54A and the slit 54B.

  Further, a tether upper portion 56A on the upper side (one longitudinal side) of the upper slit 54A extends along the inner side in the vehicle width direction of the main chamber 52M. Then, the tether upper end portion 56B located at the upper end portion (one longitudinal end portion) of the tether 56 is sewn (attached) to the upper edge (upper end portion) of the main chamber 52M as shown in FIG. ). The tether upper end portion 56B may be attached to the roof side portion of the vehicle. For example, the tether upper end portion 56B may be fastened to the fastening point 58 between the roof side rail and the curtain airbag 52.

  On the other hand, a tether lower portion 56C on the lower side (the other end in the longitudinal direction) than the lower slit 54B extends along the inner surface in the vehicle width direction of the sub-chamber 52S. The tether lower end 56D located at the other end in the direction is sewn (attached) to the lower edge (lower end) of the sub chamber 52S.

(Action and effect)
Next, the operation and effect of this embodiment will be described.

  In this embodiment, when the non-inflatable portion 54 is pushed outward in the vehicle width direction by the head of an occupant who has moved inertially forward in the oblique direction of the vehicle at the time of an oblique vehicle collision or a minute lap collision, The base fabric 54 </ b> C between the two moves in the direction of arrow A in FIG. 7 (outside in the vehicle width direction) and pulls the tether 56. As a result, the main chamber 52M and the sub chamber 52S can be bent from the base cloth 54C between the slit 54A and the slit 54B to protect the occupant's head.

  Specifically, the main chamber 52M moves in the direction of arrow B in FIG. 7, and the sub chamber 52S moves in the direction of arrow C in FIG. In this way, even when the head of the occupant who has moved inertially forward in the oblique direction of the vehicle does not contact the main chamber 52M but contacts the non-inflatable portion 54, the tension is effectively applied to the tether 56. Can do. Other operations and effects are the same as in the first embodiment.

  As in the first embodiment, when the length of the tether 56 is set short, tension is applied to the tether 56 as the main chamber 52M expands and deploys, so the sub-chamber 52S is bent inward in the vehicle width direction. It is done. That is, the sub chamber 52S is disposed on the inner side in the vehicle width direction than the main chamber 52M.

<Third Embodiment>
Next, a curtain airbag device for a vehicle according to a third embodiment of the present invention will be described with reference to FIG. In addition, in this embodiment, since it is the structure similar to 1st Embodiment except the curtain airbag 20, only the structure of the curtain airbag 20 is demonstrated. Moreover, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  The curtain airbag 20 constituting the curtain airbag device 60 for a vehicle according to the present embodiment is provided with a seam portion 62 from which no gas flows in, in addition to the non-inflatable portion 32. The seam portion 62 is provided in the gas flow path 20F between the main chamber 20M and the sub-chamber 20S, and in the present embodiment, the seam portion 62 is formed in a substantially oval shape in a vehicle side view.

(Action and effect)
In the present embodiment, by providing the seam portion 62 in a part of the gas flow path 20F, the cross-sectional area of the gas flow path 20F during expansion and deployment of the main chamber 20M and the sub chamber 20S is reduced. Resistance at the time of bending (moving) inward in the width direction can be reduced. That is, the sub-chamber 20S can be smoothly bent inward in the vehicle width direction with the tension acting on the tether 30 as a starting point. Other operations are the same as in the first embodiment.

  In the present embodiment, the seam portion 62 is formed in a substantially oval shape in a vehicle side view, but the present invention is not limited to this. For example, the seam portion 62 may be formed in another shape, or may be formed in a substantially elliptical shape. Further, a plurality of seam portions 62 may be formed in the gas flow path 20F as long as the supply of gas from the main chamber 20M to the sub chamber 20S is not delayed.

  In the first to third embodiments, the curtain airbag device and the driver's seat airbag device 14 are provided, but the present invention is not limited to this. For example, it is good also as a structure provided with the safety device and curtain airbag apparatus of the form different from the driver's seat airbag apparatus 14. FIG. For example, it is good also as a structure which protects a passenger | crew with respect to a micro lap collision and diagonal collision only with a curtain airbag apparatus. Further, for example, at the front end of the main chamber for the rear seat, a pair of sub-chambers that are inflated and deployed in the vehicle width direction are provided, so that the head of the rear seat occupant is prevented or suppressed from contacting the center pillar. It may be. Similarly, the passenger seat side may have a curtain airbag device and a passenger seat airbag device.

  Furthermore, in 1st this embodiment-3rd Embodiment, although the elongate tether was used as a tension member, this invention is not limited to this. For example, a substantially string-like strap may be used. In this case, for example, in FIG. 3, the upper end of the strap extends along the outer side in the vehicle width direction of the main chamber 20M and is sewn to the upper edge of the main chamber 20M. The lower end portion of the strap may be sewn to the lower edge of the sub chamber 20S. Thereby, tension | tensile_strength acts on a strap with expansion | swelling of the main chamber 20M, and can pull the sub chamber 20S to the vehicle width direction inner side.

  As described above, the collision-protection airbag device according to the first embodiment to the third embodiment of the present invention has been described. However, these embodiments may be appropriately combined and used without departing from the gist of the present invention. Of course, the present invention can be implemented in various modes.

DESCRIPTION OF SYMBOLS 10 Vehicle curtain airbag apparatus 12 Vehicle 20M Main chamber 20S Subchamber 20F Gas flow path 22 Inflator 24 Side window glass 29 Roof side part 30 Tether (tensile member)
30B Tether upper end (longitudinal end)
Lower part of 30C tether (the other end in the longitudinal direction)
30E tether middle part (longitudinal middle part)
32 Non-inflatable portion 32A Slit 50 Vehicle curtain airbag device 52M Main chamber 52S Subchamber 54 Non-inflatable portion 54A Slit 54B Slit 56 Tether (tensile member)
56B tether upper end (longitudinal end)
56C Lower tether (the other end in the longitudinal direction)
56E tether middle part (longitudinal middle part)
60 Curtain airbag device for vehicle 62 Seam part

Claims (5)

A main chamber that expands in a curtain shape along the side window glass by the pressure of the gas generated from the inflator;
The main chamber is formed on the front side of the vehicle and expands by the pressure of the gas supplied from the main chamber, and is partially partitioned from the main chamber by a non-expanding portion that extends obliquely forward and forward of the vehicle. A sub-chamber,
It is formed in a long shape, and one end in the longitudinal direction is attached to the upper end of the main chamber or the roof side located above the vehicle, and the middle in the longitudinal direction is passed through a slit formed in the non-expanded portion. A tension member having the other end in the longitudinal direction extending along the inner surface in the vehicle width direction of the sub-chamber and attached to the lower portion of the sub-chamber ,
A curtain airbag device for a vehicle, wherein one end side in the longitudinal direction from the slit of the tension member is disposed outside the main chamber in the vehicle width direction . A main chamber that expands in a curtain shape along the side window glass by the pressure of the gas generated from the inflator;
The main chamber is formed on the front side of the vehicle and expands by the pressure of the gas supplied from the main chamber, and is partially partitioned from the main chamber by a non-expanding portion that extends obliquely forward and forward of the vehicle. A sub-chamber,
It is formed in a long shape, and one end in the longitudinal direction is attached to the upper end of the main chamber or the roof side located above the vehicle, and the middle in the longitudinal direction is passed through a slit formed in the non-expanded portion. A tension member having the other end in the longitudinal direction extending along the inner surface in the vehicle width direction of the sub-chamber and attached to the lower portion of the sub-chamber,
The non-inflatable part is provided with two slits,
The curtain airbag device for a vehicle , wherein the intermediate portion in the longitudinal direction of the tension member is passed through the two slits . 3. The curtain airbag device for a vehicle according to claim 1, wherein the main chamber is housed in the roof side portion and is accordion-folded at least at a portion where the tension member is disposed . 4. A gas flow path that communicates the main chamber and the sub chamber is provided on the vehicle upper side of the non-inflatable portion,
The curtain airbag device for a vehicle according to any one of claims 1 to 3, wherein a seam portion is provided in a part of the gas flow path . The vehicular curtain air according to any one of claims 1 to 4, wherein the sub-chamber is disposed on the inner side in the vehicle width direction than the main chamber in an inflated and deployed state and is in contact with an instrument panel. Bag device.