JP3988566B2 - Air bag device for rear impact - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention prevents the airbag from interfering with the occupant's head when the airbag is inflated and deployed between the rear seat and the rear window glass when an impact is applied to the vehicle from the rear. Rear impact airbag for improved protectionIn placeRelated.
[0002]
[Prior art]
Conventionally, as this type of airbag device, for example, a device disclosed in Japanese Utility Model Laid-Open No. 6-65117 is known. This device includes a sensor for detecting acceleration applied to the rear seat portion and an airbag housed inside the rear seat in a folded state. When the rearward acceleration of the vehicle body is detected by the sensor, the airbag is inflated and deployed instantaneously, and the impact on the occupant seated on the rearmost seat is absorbed.
[0003]
As another example of such an airbag device, an airbag that is inflated and deployed as described above is housed in the lower part of the cargo compartment behind the rearmost seat (Japanese Utility Model Laid-Open No. 64-7054). There are also known ones (Japanese Patent Laid-Open No. 7-186870) housed in the lower part of a rear package tray provided at the rear of the seat.
[0004]
[Problems to be solved by the invention]
When each airbag device is inflated and deployed between the rearmost seat and the rear window glass, for example, when the head of an occupant protrudes rearward from the headrest of the seat, Airbag interferes with occupant's head. For this reason, there has been a problem that proper inflation and deployment of the airbag is hindered and the protection function of the airbag is lowered.
[0005]
In addition, among the conventional airbag devices described above, in the device that accommodates the airbag inside the seat, since the airbag is bulky, the seat comfort of the seat is allowed to deteriorate, and the interior The air bag must be accommodated. Furthermore, in the configuration in which the airbag is accommodated in the lower part of the luggage compartment or rear package tray provided behind the rearmost seat, there is a risk of hindering the inflation and deployment of the airbag. Will not be able to be placed, causing a drop in convenience.
[0006]
  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to prevent the airbag from interfering with the head of the occupant seated in the rearmost seat when a rear-end collision occurs in the vehicle and the airbag is inflated and deployed. A rear-impact air bag that can avoid a decrease in comfort and conveniencePlaceIt is to provide.
[0007]
[Means for Solving the Problems]
  In the following, means for achieving the above object and its effects are described.
  (1) The invention according to claim 1 is a folded state in which a sensor that outputs a signal by predicting a predetermined impact or more applied to the vehicle or detecting a predetermined impact or more applied to the vehicle is output. An airbag that inflates and deploys between the rear seat of the vehicle and the rear window glass when the signal is output through the sensor, and a gas for inflating the airbag. In a rear impact airbag device comprising a gas generating means for generating, the airbag isConsists of a back side sheet that comes into contact with the rear window glass with expansion and deployment, and a front side sheet that opposes the back side sheet,The mounting portion is attached to the roof of the vehicle through a mounting portion provided on a portion corresponding to the upper side of the vehicle, and the mounting portion is on a side opposite to a deployment direction of the airbag with respect to a folding portion that is inflated and deployed upon receiving the supply of the gas. And the folding part is accommodated in the rear end part in the roof in a state in which the folding part can be inflated and deployed between the rear seat and the rear window glass, and the gas generating means is provided in the folding part. The airbag device is inflated and deployed in a manner along the rear window glass through a deployment direction control means, at a position adjacent to the folding portion on the opposite side to the deployment direction of the airbag. MakeAs the deployment direction control means, the back sheet of the airbag is formed of a non-permeable cloth that does not transmit gas, and the front sheet of the airbag is formed of a permeable cloth that transmits gas.That is the gist.
[0008]
  (2) The invention according to claim 2 is the rear impact airbag device according to claim 1, wherein the roof of the vehicle has a roof panel as an exterior member and a surface of the roof panel on the vehicle interior side. It is comprised by the inner panel to cover and the roof head lining which is a decoration member provided in the vehicle interior side of the inner panel, The said airbag and the said inflator are accommodated between the said roof panel and the said roof head lining. That is the gist.
(3) The invention according to claim 3 is the rear impact airbag apparatus according to claim 2, wherein the attachment portion of the airbag is attached to the inner panel.
[0009]
  (4) The invention according to claim 4 is the rear impact airbag device according to claim 2 or 3, wherein the airbag and the inflator are accommodated between the inner panel and the roof head lining. The gist of this is.
(5) The invention according to claim 5 is the rear impact airbag device according to claim 4, wherein a case for accommodating the airbag is formed through the inner panel and the roof head lining. When the airbag is inflated and deployed, an opening for projecting the airbag from the roof into the vehicle compartment is formed by deformation of the rear end portion of the roof head lining located on the deployment direction side with respect to the folded portion of the airbag. The gist is to be done.
[0010]
  (6) The invention according to claim 6 is any one of claims 1 to 5.One paragraphIn the rear impact airbag device according to claim 1, the airbag is configured by a back side sheet that comes into contact with the rear window glass in association with inflation and deployment, and a front side sheet that faces the back side sheet, and serves as the deployment direction control means. The gist is that the back sheet is formed of a material having a larger coefficient of friction than the material of the front sheet.
  (7) The invention described in claim 7, ContractClaims 1 to6EitherOne paragraphIn the rear impact airbag device according to claim 1, the airbag is configured by a back side sheet that comes into contact with the rear window glass in association with inflation and deployment, and a front side sheet that opposes the back side sheet, on the surface of the back side sheet. The gist is that a protective layer is provided.
[0011]
  (8Claim8The invention described in claim 17EitherOne paragraphIn the airbag apparatus for rear impact according to claim 1, as the deployment direction control means, the folded portion of the airbag is formed in a spiral shape that is wound toward the vehicle interior side in the front-rear direction of the vehicle. The gist of the portion is to expand and deploy while being rewound in a manner along the rear window glass.
  (9Claim9The invention described in claim 17EitherOne paragraphIn the rear impact airbag device according to claim 1, as the deployment direction control means, guide mechanisms are provided on the left and right sides of the rear window glass to guide the airbag in the vertical direction in a manner along the vertical side of the rear window glass. The gist is that
[0012]
  (10Claim10The invention described in,carA sensor that outputs a signal in anticipation of an impact greater than or equal to a predetermined amount applied to the vehicle, or that detects an impact greater than or equal to a predetermined amount applied to the vehicle, and is accommodated in a folded state, and is passed through the sensor. In a rear impact airbag device comprising an airbag that inflates and deploys between a rearmost seat of the vehicle and a rear window glass when a signal is output, the airbag includes the rearmost seat and the rear window. A rear side sheet that is folded in a state where it can be inflated and deployed toward the glass and is accommodated in a rear end portion in the roof of the vehicle, and that comes into contact with the rear window glass along with the expansion and deployment, and The airbag device includes an air bag that is disposed along the rear window glass through a deployment direction control means. In the embodiment, as the deployment direction control means, the back sheet is formed of a non-permeable cloth that does not transmit gas, and the front sheet is formed of a permeable cloth that transmits gas. It is a summary.
  (11Claim11The invention described in claim 110The air bag device for rear impact according to claim 1, further comprising gas generating means for generating a gas for inflating the airbag, wherein the gas generating means is supplied to the folding portion that is inflated and deployed upon receiving the gas. The gist of the invention is that the airbag is provided at a position adjacent to the folding portion on the side opposite to the deployment direction of the airbag.
  (12Claim12The invention described in claim 111EitherOne paragraphThe airbag device for a rear-end collision described in 1) is characterized in that gas is supplied into the airbag from the vicinity of the center of the airbag in the vehicle width direction when the airbag is inflated and deployed.
[0013]
  (Function)
  -According to invention of Claim 1, since an airbag is accommodated in the rear-end part in a roof, it causes the fall of a passenger | crew's seating comfort resulting from accommodating an airbag in a rearmost seat. In addition, it is possible to accurately avoid a reduction in convenience for storing the luggage due to the airbag being stored in the luggage compartment or the rear package tray at the rear of the vehicle. In addition, since the airbag is inflated and deployed in a manner along the rear window glass through the deployment direction control means,That is, when the airbag is inflated and deployed, the gas is permeated from the front side sheet but the gas is not permeated from the back side sheet, so that the airbag is inflated and deployed along the rear window glass. It is possible to accurately suppress interference with an occupant seated in a seat.In addition, the airbag is installed in the roof in a state in which the attachment portion is located on the opposite side of the folding direction of the airbag with respect to the folding portion and the folding portion is inflatable and deployable between the rear seat and the rear window. Since it is difficult to hinder the inflation and deployment of the airbag from the inside of the roof to the rear seat glass and the rear window glass by being accommodated in the rear end portion of the roof, proper and rapid inflation and deployment of the airbag is achieved. An aspect comes to be obtained.
[0014]
  According to the invention described in claim 6, when the airbag is inflated and deployed, the airbag is inflated and deployed in a manner along the rear window glass by contact between the back sheet having a large friction coefficient and the rear window glass. To prevent interference between the airbag and the occupant seated in the rear seat..
[0015]
  ・ Claim7According to the invention described inSince the fragments of the rear window glass are captured by the protective layer, the airbag main body is accurately protected from the fragments.
[0016]
  ・ Claim8According to the invention described inSince the spiral portion of the airbag is inflated and deployed in a manner along the rear window glass, the interference between the airbag that is inflated and deployed and the occupant seated on the rearmost seat is more accurately suppressed.
[0017]
  ・ Claim9According to the invention described inSince the airbag is inflated and deployed in a manner along the rear window glass through the guide mechanism, the interference between the airbag that is inflated and deployed and the occupant seated in the rearmost seat is more accurately suppressed.
[0018]
  ・ Claim10According to the invention described in the above, when the airbag is inflated and deployed, the gas is permeated from the front side sheet while the gas is not permeated from the back side sheet. It is possible to accurately suppress the interference between the airbag that is inflated and deployed and the occupant seated in the rearmost seat. Further, the airbag is inflated and deployed appropriately and quickly, and the protection function of the airbag is optimized. In addition, since the airbag is housed in the roof of the vehicle, it is possible to accurately avoid a decrease in the comfort of the rear seat and the convenience of storing the luggage.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  In the following, the airbag device for rear impact of the present inventionToolOne embodiment of the present invention will be described with reference to FIGS.
[0020]
As shown in FIGS. 1 and 2, an airbag 21 formed in a bag shape and an inflating gas are input to the end of the roof 11 on the rear side of the vehicle 10 by inputting a signal. And an inflator 22 to be supplied to 21. An upper end portion of the rear door 17 is attached to the rear end portion of the roof 11 so as to be opened and closed by a hinge mechanism. The rear door 17 is provided with a rear window glass 18.
[0021]
The roof 11 of the vehicle 10 includes a roof panel 12 that is an exterior member, a roof head lining 13 that is a decorative member, and an inner panel 14 as shown in FIG. Yes. The roof head lining 13 is provided so as to cover the entire surface of the roof panel 12 on the vehicle interior side with a flexible material such as synthetic resin. The inner panel 14 is provided between the roof panel 12 and the roof head lining 13.
[0022]
A plurality of mounting holes 14a are formed at a predetermined pitch in the horizontal direction at the end of the inner panel 14 on the rear side of the vehicle 10, and nuts 15 are welded so as to correspond to the mounting holes 14a. . These nuts 15 are used for mounting the airbag 21, the inflator 22, and a mounting base 25 described later. Here, the roof 11 is relatively small in deformation when an impact is applied to the vehicle 10 from the rear, and has a large degree of freedom when an accommodation space for the airbag 21 is provided near the rear end of the inner panel 14. Large capacity can be secured. Therefore, in the apparatus of the present embodiment, the airbag 21 and the inflator 22 are fixed to the inner panel 14 through the nut 15.
[0023]
As shown in FIG. 3, the airbag 21 includes a lower airbag 21A and an upper airbag 21B. Both airbags 21 </ b> A and 21 </ b> B are respectively wound inside to form spirals before being attached to the vehicle 10 and are accommodated in the accommodating space. A plurality of attachment portions 21b having attachment holes 21a are formed in the portion corresponding to the upper side of the lower airbag 21A so as to correspond to the attachment holes 14a provided in the inner panel 14. A plurality of attachment portions 21b having attachment holes 21a are also formed in the portion corresponding to the lower side of the upper airbag 21B so as to correspond to the attachment holes 14a provided in the inner panel 14. The inflator 22 is provided with flange portions 22b having attachment holes 22a at two locations. As shown in FIGS. 3 and 4, the bolts 16 are inserted into the mounting holes 21 a and 22 a and the mounting holes 14 a provided in the inner panel 14, and the bolts 16 are screwed into the nuts 15. The airbags 21A and 21B and the inflator 22 are fixed to the inner panel 14.
[0024]
A bag storage case 23 is disposed in front of the airbag 21. The bag storage case 23 is fixed to the front end surfaces of a plurality of mounting bases 25 (see FIG. 4) fixed to the inner panel 14 by bolts 16 similar to the bolts 16 to the nut 15 by screws 24. The bag housing case 23 is made of a flexible synthetic resin material. When the lower and upper airbags 21A and 21B are inflated and deployed, the lower end 23a and the upper end 23b are shown in FIG. 3 by the airbags 21A and 21B. As indicated by the chain line, it is pushed open and deformed.
[0025]
As shown in FIG. 3, the spiral portion of the lower airbag 21 </ b> A is wound in the clockwise direction so that the vehicle outer surface becomes the outer peripheral surface toward the center. In the expansion and deployment, as shown by a one-dot chain line in FIG. 3, the rear window glass 18 and the last are arranged along the inner surface of the rear window glass 18 attached to the rear door 17 from the lower end of the bag housing case 23. It expands and deploys so as to partition the part seat 19. On the other hand, the spiral portion of the upper airbag 21B is wound in the counterclockwise direction so that the vehicle outer surface becomes the outer peripheral surface as shown in FIG. When the bag is inflated, it is inflated and deployed along the lower surface of the roof head lining 13 by pushing the upper edge of the bag housing case 23 as shown by a one-dot chain line in FIG.
[0026]
In this embodiment, the lower airbag 21A has a spiral portion, and this spiral portion constitutes a deployment direction control means. The bag housing case 23 is originally a part integrally formed by the roof head lining 13, but in this embodiment, the bag housing case 23 is divided and configured to accommodate the airbag 21. Therefore, it can be said that the airbag 21 is accommodated using the space between the roof head lining 13 and the inner panel 14.
[0027]
As shown in FIG. 1, a sensor 28 is provided in the vicinity of the rear bumper 27 of the vehicle 10. This sensor 28 outputs a signal to that effect when a predetermined impact or more is applied to the vehicle 10 from behind. The vehicle 10 is a vehicle in which the distance between the rear bumper 27 and the rear seat 19 is short, and the rear end of the roof 11 is located rearward of the rear seat 19 ( For example, a 1 box car or a 2 box car) is assumed.
[0028]
The airbag apparatus according to the present embodiment includes an electronic control unit 29 configured by, for example, a microcomputer. The electronic control device 29 takes in the output signal of the sensor 28, calculates whether or not an impact has been applied to the vehicle 10 based on the signal, and outputs an operation signal to the inflator 22 according to the calculation result. .
[0029]
In this device, when a predetermined impact or more is applied to the vehicle 10 from behind, the sensor 28 outputs a signal, and this output signal is taken into the electronic control device 29. At this time, the electronic control unit 29 determines that an impact has been applied to the vehicle 10 and outputs an operation signal to the inflator 22. As a result, the inflation gas is supplied from the inflator 22 into the bag-like airbags 21A and 21B, and the upper airbag 21B is placed along the rear window glass 18 as shown in FIG. Inflated and deployed in different directions along the lower surface of the roof head lining 13.
[0030]
Since the lower airbag 21A is inflated and deployed along the rear window glass 18, the lower airbag 21A is not interfered with the head of the occupant seated on the rear seat 19, and the inflation and deployment of the lower airbag 21A can be performed appropriately and quickly. It can be carried out. Further, the inflated and deployed airbag 21A reduces the influence on the vehicle interior due to scattered objects from the rear, entering objects, and the like, and the impact applied to the rear of the vehicle 10 is absorbed.
[0031]
On the other hand, in a state where the upper airbag 21B is inflated and deployed along the roof head lining 13, the head is protected by the upper airbag 21B even if the occupant moves upward due to the impact of an accident.
[0032]
According to the present embodiment described above, the following effects can be obtained.
(1) As shown in FIG. 3, the lower airbag 21 </ b> A is wound to form a spiral portion, and the spiral portion is unwound and expanded when the inflator 22 is inflated and deployed. For this reason, the spiral portion is moved along a movement trajectory T indicated by a one-dot chain line in FIG. The reason why the movement trajectory T is directed to the rear window glass 18 is that the spiral portion has a predetermined mass, so that when the inflation gas is blown into the lower airbag 21A, the lower airbag 21A is formed. This is because the back sheet 52 is more easily moved to the rear window glass 18 side than the front sheet 51 among the front and back sheets. Since the lower airbag 21A is deployed along the inner surface of the rear window glass 18 as indicated by a two-dot chain line, it is possible to prevent the lower airbag 21A from interfering with the head of the passenger seated in the rear seat. it can. Therefore, the inflating and deploying operation of the lower airbag 21A can be performed appropriately and quickly, and the passenger can be properly protected.
[0033]
(2) As shown in FIG. 3, the upper airbag 21 </ b> B is wound to form a spiral portion, and the spiral portion is unwound and inflated and deployed at the time of inflation and deployment by the inflator 22. For this reason, since the upper airbag 21B is deployed along the lower surface of the roof head lining 13, the upper airbag 21B does not interfere with the head of the occupant, and the deployment operation can be performed appropriately and quickly. Can be properly protected.
[0034]
(3) Since the lower and upper airbags 21 </ b> A and 21 </ b> B are provided at the end of the roof 11 on the rear side of the vehicle 10, an airbag device is embedded in the rearmost seat 19 and the use of the luggage compartment is restricted. There is no need to Therefore, it is possible to avoid a decrease in seating comfort and convenience.
[0035]
(4) The lower and upper airbags 21 </ b> A and 21 </ b> B are fixed to the rear end portion of the roof 11 that is less deformed when an impact is applied to the vehicle 10 from the rear. For this reason, it is possible to prevent the deployment of the lower and upper airbags 21A and 21B from being hindered and the deployment direction from being changed carelessly. Therefore, the lower and upper airbags 21A and 21B can be more reliably brought into a desired deployed state when the airbag device is activated.
[0036]
(5) Since the lower and upper airbags 21A and 21B and the inflator 22 are accommodated in the roof 11, the accommodation space for the lower and upper airbags 21A and 21B and the inflator 22 can be easily secured. . Moreover, since the lower and upper airbags 21A and 21B and the inflator 22 are accommodated between the inner panel 14 and the bag accommodating case 23, the airbag 21 and the inflator 22 are covered with the bag accommodating case 23. Can also look good.
[0037]
(6) The lower airbag 21A is inflated and deployed along the inner surface of the rear window glass 18. For this reason, the influence to the vehicle interior by the scattered matter from the rear, an approaching matter, etc. is reduced. In particular, by mounting such an airbag device on a vehicle in which the distance between the rear seat 19 and the rear bumper 27 is short, the above-described effect can be remarkably exhibited.
[0038]
(Another embodiment)
Next, embodiments in which the present invention is embodied in connection with the rear seat 19 will be described with reference to FIGS. In this embodiment, a head moving means for moving at least the head of an occupant seated in the rearmost seat 19 forward is provided.
[0039]
In the embodiment shown in FIG. 5, among the cushion 33, the backrest 34, and the headrest 35 constituting the rear seat 19, the backrest 34 that is supported by the cushion 33 via the hinge mechanism 36 so as to be tiltable in the front-rear direction, A forward tilting actuator 37 such as an air cylinder can be tilted forward. In this embodiment, the hinge mechanism 36, the forward tilting actuator 37, and the sensor 28 constitute a tilting mechanism for the backrest 34.
[0040]
When the sensor 28 is actuated, an operation signal is output from the electronic control unit 29, the backrest 34 is tilted forward by the forward tilting actuator 37, and the occupant seated in the rearmost seat 19 is in a forward tilting posture. Moved. This increases the distance between the headrest 35 and the rear window glass 18 and reliably prevents the lower airbag 21A from interfering with the head of the occupant when the lower airbag 21A is inflated and deployed downward. Passengers can be protected.
[0041]
In the embodiment shown in FIG. 6A, a forward air cylinder 40 as a moving mechanism for moving the cushion 33 forward is provided in a vehicle frame. When the sensor 28 is activated, the entire rear seat 19 is moved forward by the forward air cylinder 40, and the lower airbag 21A interferes with the occupant's head when the lower airbag 21A is inflated and deployed. It can be avoided and protected appropriately.
[0042]
In FIG. 6A, an ascending actuator 41 that constitutes an ascending mechanism may be provided inside the backrest portion 34. Also in this case, the passenger's head of the rear seat 19 is moved forward, so that the lower airbag 21A is prevented from interfering with the passenger's head during inflation and deployment.
[0043]
In the embodiment shown in FIG. 6B, a forward tilting actuator 42 as a forward tilting mechanism of the headrest 35 is provided inside the backrest portion 34, and the headrest 35 is tilted forward by the forward tilting actuator 42. Is. When the sensor 28 is actuated, the headrest 35 is tilted forward by the forward tilting actuator 42, the occupant's head is moved forward, and the lower airbag is applied to the occupant's head when the lower airbag 21A is inflated and deployed. It is possible to prevent the bag 21A from interfering.
[0044]
In the embodiment shown in FIG. 5 and FIG. 6, when a belt wrapping device (not shown) for automatically winding a seat belt around the rear seat 19 is provided, and the rear seat 19, the backrest 34 or the headrest 35 is operated. The seat belt may be automatically wound. In this case, the state in which the head of the occupant is moved forward can be maintained and protection can be performed more appropriately.
[0045]
In the embodiment shown in FIGS. 5 and 6, the interference of the airbag 21 with the occupant's head can be prevented even if the lower airbag 21 </ b> A does not include a deployment direction control means such as a spiral portion.
[0046]
In the embodiment shown in FIG. 7, guide rails 45 and 46 are attached along the vertical sides of the left and right sides of the rear window glass 18, and an air bag 21 ′ also serving as a sun shoe is provided between the guide rails 45 and 46. It is what was attached. The upper end edge of the airbag 21 ′ is connected to the rear end portion of the roof 11, and guided rings 47 and 48 are attached to the lower end edge so that the air bag 21 ′ can reciprocate in the vertical direction along the guide rails 45 and 46. ing. In this embodiment, the guide rail 45, 46 and the guided rings 47, 48 constitute a guide mechanism for the airbag 21 '. The airbag 21 'is configured by two layers of transparent resin sheets, and visibility from inside and outside the vehicle is given.
[0047]
In this embodiment, the opening / closing operation of the airbag 21 ′ may be performed by an electric opening / closing mechanism (not shown).
In this embodiment, when a rear-end collision of the vehicle occurs, the inflator 22 is operated and the airbag 21 'is inflated and deployed, thereby protecting the passenger in the rear seat. Since the airbag 21 'is provided along the inner surface of the rear window glass 18, the lower airbag 21A does not interfere with the head of the passenger seated on the upper surface of the rearmost seat 19, and the lower airbag 21A. It is possible to appropriately and quickly perform the expansion and deployment operation.
[0048]
In addition, the said embodiment can also be changed and embodied as follows.
As shown in FIG. 8 (a), among the front and back sheets constituting the lower and upper airbags 21A and 21B, the back sheet 52 that is in contact with the rear window glass 18 or the roof head lining 13 is, for example, a silicon rubber coated cloth It is made of a material having a large friction coefficient. And you may form the front side sheet | seat 51 by materials, such as a non-coating cloth with a small friction coefficient. In this case, the spiral portions of the lower and upper airbags 21A and 21B are smoothly rewound, and the inflation and deployment operation can be performed more quickly.
[0049]
The front sheet 51 may be formed of a permeable cloth that allows air to pass therethrough, and the back sheet 52 may be formed of a non-permeable cloth. In this other example, the lower airbag 21 </ b> A is deployed along the inner surface of the rear window glass 18 by thrust generated by gas leakage from the front side sheet 51.
[0050]
As shown in FIG. 8 (b), the back sheet 52 is formed of a high denier nylon base fabric 53 that forms a normal airbag, and a rubber coat layer 54 such as silicon rubber is bonded to the surface thereof, For example, a felt layer 55 such as polyamide may be adhered to the rubber coat layer 54.
[0051]
In this alternative example, since the broken pieces of the rear window glass 18 damaged at the time of the rear-end collision of the vehicle are captured by the felt layer 55 and the rubber coat layer 54, the lower airbag 21A can be prevented from being damaged, It is also possible to prevent occupants from being damaged by fragments.
[0052]
In place of the sensor 28, a sensor for predicting a vehicle collision may be provided. In this case, the airbag is inflated and deployed before the vehicle collides, the backrest 34 of the rear seat 19 is tilted forward, or the headrest 35 of the rear seat 19 is tilted forward. It is possible to more reliably prevent the airbag from interfering with the head.
[0053]
In the above embodiment, the lower and upper airbags 21 </ b> A and 21 </ b> B are provided at the end of the roof 11 on the rear side of the vehicle 10, but these may be provided above the rear door 17 of the vehicle 10. .
[0054]
In the above embodiment, the inflator 22 is provided at the end of the roof 11 on the rear side of the vehicle 10, but the inflation gas can be reliably supplied to the lower and upper airbags 21A and 21B. For example, the place where the inflator 22 is provided can be arbitrarily changed.
[0055]
【The invention's effect】
  According to the first aspect of the present invention, the airbag is placed in the rearmost seat, resulting in a decrease in the seating comfort of the occupant, and the airbag is installed in the luggage compartment or the rear package tray behind the vehicle. It is possible to accurately avoid a decrease in convenience related to the storage of luggage due to the storage. In addition, the occurrence of interference between the occupant seated in the rearmost seat and the airbag can be accurately suppressed. In addition, it is possible to obtain an appropriate and quick inflation / deployment mode of the airbag.
[0056]
  According to the invention described in claim 6, it is possible to accurately suppress the interference between the airbag that is inflated and deployed and the occupant seated in the rearmost seat..
  ・ Claim7According to the invention described in (1), the airbag body can be accurately protected from the fragments of the rear window glass.
[0057]
  ・ Claim8According to the invention described in (1), it is possible to more accurately suppress the interference between the airbag that is inflated and deployed and the occupant seated in the rearmost seat.
  ・ Claim9According to the invention described in (1), it is possible to more accurately suppress the interference between the airbag that is inflated and deployed and the occupant seated in the rearmost seat.
[0058]
  ・ Claim10According to the invention described inSwellIt is possible to accurately suppress interference between the airbag that is stretched and the occupant seated in the rearmost seat. Further, the airbag can be appropriately and quickly inflated and deployed, and the protection function of the airbag can be optimized. In addition, it is possible to accurately avoid a decrease in the comfort of the rear seat and the convenience of storing the luggage.
[Brief description of the drawings]
FIG. 1 is a side view of a rear portion of a vehicle to which an embodiment of the present invention is applied.
FIG. 2 is a rear view of the vehicle.
3 is a cross-sectional view taken along line 3-3 in FIG.
FIG. 4 is a front view of the airbag and the inflator employed in the embodiment in a non-deployed state as viewed from the rear.
FIG. 5 is a side view of a rear portion of a vehicle showing another embodiment of the present invention.
6A and 6B are side views of a rear seat showing a modification of the embodiment shown in FIG.
FIG. 7 is a schematic front view of an airbag apparatus showing another embodiment of the present invention.
FIGS. 8A and 8B are cross-sectional views showing other examples of airbag seats.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Vehicle, 19 ... Back seat, 21 ... Air bag, 21A ... Lower airbag, 21B ... Upper airbag, 28 ... Sensor, 34 ... Backrest part, 35 ... Headrest.

Claims (12)

A sensor that outputs a signal in anticipation of an impact greater than or equal to a predetermined amount applied to the vehicle or detects an impact greater than or equal to the predetermined amount applied to the vehicle; Rear impact air comprising an airbag that inflates and deploys between the rearmost seat of the vehicle and the rear window glass when a signal is output, and gas generating means that generates gas for inflating the airbag. In the bag device,
The airbag is composed of a back side sheet that contacts the rear window glass as it is inflated and deployed, and a front side sheet that opposes the back side sheet, and is mounted on the roof of the vehicle through a mounting portion that is provided on the upper side of itself. And the folding part is located on the opposite side of the folding direction of the airbag with respect to the folding part that is inflated and deployed upon supply of the gas, and the folding part is the rear seat and the rear part. Accommodated in the rear end portion in the roof in a state where it can be inflated and deployed toward the window glass,
The gas generating means is provided at a position adjacent to the folding part on the side opposite to the deployment direction of the airbag with respect to the folding part,
The airbag device inflates and deploys the airbag in a manner along the rear window glass through a deployment direction control means ,
As the deployment direction control means, the back sheet of the airbag is formed of a non-permeable cloth that does not transmit gas, and the front sheet of the airbag is formed of a permeable cloth that transmits gas. A crash airbag device. In the airbag apparatus for rear collisions of Claim 1,
The roof of the vehicle includes a roof panel that is an exterior member, an inner panel that covers a surface of the roof panel on the vehicle interior side, and a roof head lining that is a decorative member provided on the vehicle interior side of the inner panel. The airbag and the inflator are accommodated between the roof panel and the roof head lining. The rear impact airbag device according to claim 2,
A rear impact airbag device, wherein the airbag is attached to the inner panel. The rear impact airbag device according to claim 2 or 3,
The airbag and the inflator are accommodated between the inner panel and the roof head lining. The rear impact airbag device according to claim 4,
A case for accommodating the airbag is formed through the inner panel and the roof head lining, and when the airbag is inflated and deployed, an opening for projecting the airbag from the roof into the vehicle interior is formed in the airbag. A rear-impact airbag device characterized by being formed through deformation of a rear end portion of the roof head lining located on the deployment direction side with respect to the folding portion. In the airbag device for rear impacts according to any one of claims 1 to 5,
The airbag is composed of a back sheet that comes into contact with the rear window glass when inflated and deployed, and a front sheet facing the back sheet, and the back sheet is made of a material of the front sheet as the deployment direction control means. A rear-impact airbag device characterized by being made of a material having a large friction coefficient. In the airbag device for rear impacts according to any one of claims 1 to 6,
  The airbag is composed of a back sheet that comes into contact with the rear window glass as it is inflated and deployed, and a front sheet that faces the back sheet, and a protective layer is provided on the surface of the back sheet.
  An air bag device for rear impact characterized by the above. In the airbag device for rear impacts according to any one of claims 1 to 7,
  As the deployment direction control means, the folded portion of the airbag is formed in a spiral shape that is wound toward the vehicle interior side in the front-rear direction of the vehicle, and the spiral folded portion is in a mode along the rear window glass. Inflates and expands while being rewound
  An air bag device for rear impact characterized by the above. In the airbag device for rear impacts according to any one of claims 1 to 7,
  As the deployment direction control means, guide mechanisms are provided on the left and right sides of the rear window glass to vertically guide the airbag in a manner along the vertical side of the rear window glass.
  An air bag device for rear impact characterized by the above. A sensor that outputs a signal in anticipation of an impact greater than or equal to a predetermined amount applied to the vehicle or detects an impact greater than or equal to the predetermined amount applied to the vehicle; In a rear impact airbag device comprising an airbag that inflates and deploys between a rear seat of the vehicle and a rear window glass when a signal is output,
  The airbag is folded between the rear seat and the rear window glass so as to be inflatable and deployable, and is accommodated in a rear end portion in the roof of the vehicle. It is composed of a back sheet that contacts the window glass, and a front sheet that faces the back sheet,
  The airbag device inflates and deploys the airbag in a form along the rear window glass through a deployment direction control means,
  As the developing direction control means, the back sheet is formed of a non-permeable cloth that does not transmit gas, and the front sheet is formed of a permeable cloth that transmits gas.
  An air bag device for rear impact characterized by the above. In the airbag apparatus for rear impacts of Claim 10,
  Gas generating means for generating gas for inflating the airbag is provided, and the gas generating means is provided on a side opposite to a deployment direction of the airbag with respect to a folding portion that is inflated and deployed upon receiving the supply of the gas. Provided at a position adjacent to the folding part
  An air bag device for rear impact characterized by the above. In the airbag apparatus for rear collisions as described in any one of Claims 1-11,
  When the airbag is inflated and deployed, gas is supplied into the airbag from near the center in the vehicle width direction of the airbag.
  An air bag device for rear impact characterized by the above.

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