JP6200749B2 - Vehicle seat airbag system - Google Patents

Description

  The present invention relates to a vehicle seat airbag system, and more particularly, to a seat back of a vehicle seat.

  2. Description of the Related Art In a vehicle seat such as an automobile, an airbag system that protects a seated person from an impact at the time of collision by inflating and deploying an airbag disposed in a seat back is known.

  For example, the vehicle seat disclosed in Patent Document 1 is provided with a seat pad on the front surface of an erection elastic support member erected inward of a seat back frame, and the erection elastic support member and the erection elastic support member are disposed behind the erection elastic support member. An air bag in a contracted state is disposed in a gap between the support plate having a simple structure.

  According to this vehicle seat, the airbag is inflated between the erection elastic support member and the support plate by the action of the inflator corresponding to the detection of a predetermined impact or more, and the rearward movement of the seated person at the time of the collision is seen from behind. While elastically supporting and regulating, the impact energy is absorbed by decompression and contraction of the airbag.

  In Patent Document 2, a first airbag that is inflated and deployed toward the seated person of the rear seat is installed at the lower back of the seat back of the front seat, and the seat back frame is further installed in the seat back of the front seat. A second airbag in a flat state is disposed on the front surface of the erection elastic support member that is erected on the inside.

  As a result, the first airbag is inflated and deployed toward the occupant of the rear seat by the action of the inflator corresponding to the detection of an impact exceeding a predetermined level, and the occupant of the rear seat moves forward due to the impact at the time of collision. Even so, it is prevented that the front seat strongly hits the back of the seat back. Furthermore, by the expansion and deployment of the second airbag, the rearward movement of the upper body of the seated person of the front seat at the time of a collision is elastically supported and restricted from the back to protect it. In addition, the timing of inflation of the first and second airbags is controlled to protect the appropriate seated person.

JP-A-10-273000 JP 2010-52621 A

  As described above, the vehicle seat disclosed in Patent Literature 1 achieves protection of a seated person of the seat seat by the presence of the airbag and a support plate having a strong structure on the rear outer side. In other words, the seat occupant is mitigated by the airbag against the rearward movement, and the impact applied from the rear of the seat back is first received by the support plate, and the impact is absorbed by the airbag. Will be.

  Accordingly, when there is a seat behind and there is a seated person, a collision from the rear of the seat back to the front seat of the seated person after that causes a large impact at the time of the collision with the support plate. Therefore, the impact from the rear cannot be received softly, and there is a possibility that not only the damage to the knee of the seated occupant of the rear seat, but also the impact to the seated occupant becomes large.

  On the other hand, according to the airbag device of Patent Document 2, the second airbag that is inflated and deployed in the seat back of the front seat can be expected to protect the seated person of the front seat and reduce damage, The first seat airbag is inflated and deployed toward the seated person, thereby protecting the rear seat seated person. However, in addition to the installation of the airbag in the seat back, a first airbag that inflates and deploys toward the rear outside of the seat bag must be separately provided at the lower portion of the seat bag of the front seat. And the control burden of each air bag increases.

  In addition, since the first airbag bulges obliquely upward from the lower back of the seat back of the front seat toward the seat occupant of the rear seat, and the inflated and deployed shape becomes unstable, the rear seat There is a risk of lack of stability in accurately and reliably receiving a collision of a seated person on the front seat with the seat back and absorbing the impact.

  As described above, in each structure of the above-mentioned conventional patent document, with a simple structure, for the direct protection of the seated person of the front seat by the airbag and the protection from the impact to the seat back from the rear, There is room for further improvement.

  In a vehicle such as an automobile, the collision of the seat of the front seat such as the knee of the seated person in the rear seat as described above is not only in the case of a collision from the front but also in the rear part of the vehicle body at the time of the collision from the rear. Due to deformation or the like, there is a possibility that this may occur even in a situation where the seated person of the rear seat is pushed forward and the knee strongly hits the back of the seat back of the front seat.

  The present invention has been made in view of the above-described problems, and its purpose is to provide direct protection of a seated person at an airbag and an impact from behind a seat back without a complicated configuration. It is an object of the present invention to provide an air bag system for a vehicle seat that enables accurate reduction.

The vehicle seat airbag system according to claim 1, which achieves the above object, includes a headrest displacing means which is installed above the seatback and displaces the headrest to a predetermined position in response to a collision, and the seatback. In the vehicle seat airbag system in which an airbag is inflated and deployed, the inflation and deployment in the seat back is performed by the airbag that inflates and supports the upper body of a seated person elastically, and the airbag The rear surface of the seat back is inflated rearward so as to elastically receive the impact force applied to the back of the seat back, and the airbag is inflated and deployed in the seat back, corresponding to the collision. The displacement of the headrest is controlled in conjunction with each other.

  According to this, with a simple configuration in which the inflation and deployment of the airbag in the seat back and the displacement of the headrest are controlled in conjunction, the headrest is displaced to a predetermined position to restrain the seated person's head and The occurrence of whiplash injury can be suppressed, and by inflating and deploying the airbag, it is possible to elastically receive the rearward movement of the seated person due to the collision and protect the vehicle seat seated person from the impact from the rear. Without any complication, it is possible to directly protect a seated person with an air bag at the time of a collision and to accurately reduce an impact from behind the seat back.

According to a second aspect of the present invention, in the vehicle seat airbag system according to the first aspect, a control unit that controls the inflation and deployment of the airbag and the displacement of the headrest, and a collision prediction unit that predicts a collision with the vehicle, , wherein the interlocked control, the allowed control unit displaces the headrest according collision information foreseen by the collision prediction means to the predetermined position, the displacement at the same time as the inflation and deployment of the airbag in the Shitoba' click It is made to start.

  According to this, the headrest is displaced to a predetermined position in accordance with the collision occurrence information predicted by the collision prediction means, and at the same time, the airbag starts to inflate and deploy, thereby restraining the head of the seated person by the headrest and inflating and deploying the airbag. This makes it possible to optimize the sitting posture by pressing the seated person, and to suppress the occurrence of whiplash injury of the seated person, and to elastically receive the backward movement of the seated person due to the collision by the inflating and deploying airbag In addition, the vehicle seat occupant can be protected from an impact from the rear.

According to a third aspect of the present invention, in the vehicle seat airbag system according to the first aspect, a control unit that controls the inflation and deployment of the airbag and the displacement of the headrest, and a collision prediction unit that predicts a collision with the vehicle, , wherein the interlocked control is the headrest and the control unit in accordance with a collision occurrence information is predicted by the collision prediction means is displaced to the predetermined position, thereby inflating and deploying the air bag within the Shitoba' click after displacement It is characterized as follows.

  According to this, by restraining the head with the headrest before the airbag is inflated and deployed to make the seated person's sitting posture appropriate, the occurrence of the whiplash injury of the seated person can be suppressed. After that, the airbag starts to inflate and deploy in a state where the head of the seated person is constrained by the headrest, and the airbag is elastically received by the airbag due to the collision, and from behind. The vehicle seat occupant can be protected from the impact of the vehicle.

According to a fourth aspect of the present invention, in the vehicle seat airbag system according to the first aspect, a control unit that controls the inflation and deployment of the airbag and the displacement of the headrest, and a collision prediction unit that predicts a collision with the vehicle. , wherein the interlocked control, the control unit starts the inflation and deployment of the airbag in the Shitoba' click according collision information foreseen by the collision prediction means, the headrest to the predetermined position after the start It is made to displace. According to a fifth aspect of the present invention, in the vehicle seat airbag system according to the fourth aspect, the interlocked control is performed in the seat back according to the collision occurrence information predicted by the collision prediction means by the control unit. The airbag is started to inflate and deploy, and after the start, the headrest is displaced to the predetermined position, and then the airbag is further inflated and deployed.

  According to this, the airbag is inflated and deployed in advance, and the seated person is pressed by the airbag that is inflated and deployed to bring the seating posture into an appropriate state. Is restrained. Thereafter, the airbag is further inflated and deployed. As a result, the rearward movement of the upper body of the seated person due to the rear impact is favorably elastically received by the airbag, the rearward movement is restricted, and the vehicle seat seated person can be protected from the impact from the rear.

According to a sixth aspect of the present invention, in the vehicle seat airbag system according to any one of the second to fifth aspects, when the collision load predicted by the collision prediction means is less than a predetermined value, Inflatable deployment is prohibited. The invention according to claim 7 is the vehicle seat airbag system according to any one of claims 1 to 6, wherein a plurality of the airbags are stretched on a seat back frame forming a skeleton of the seat back. It is arranged between the constructed elastic support member and the skin forming the back surface of the seat back.

According to the invention of claim 6 , when the impact load is a predetermined value or less, the airbag is not expanded and deployed, so that the airbag can be expanded and deployed at the time of a collision with a relatively small impact. It can be omitted, and simplification of maintenance and the like accompanying the inflation and deployment of an unnecessary airbag can be obtained.

  According to the present invention, with a simple configuration that controls the inflation and deployment of the airbag in the seat back and the displacement of the headrest in a linked manner, the headrest can reliably prevent the occurrence of a whiplash injury by the headrest in a desired state at the time of collision. In addition, the airbag that inflates and deploys can elastically receive the rearward movement of the seated person due to the collision, and can protect the seated person of the vehicle seat from the impact from the rear.

It is a schematic longitudinal cross-sectional view of the vehicle seat which shows the outline | summary of the vehicle seat airbag system in one Embodiment. It is the partially broken schematic perspective view of the vehicle seat seen from the back. It is operation | movement explanatory drawing of the vehicle seat in the time of an impact generation. It is a control circuit block diagram of a vehicle seat airbag system. It is sectional drawing of the vehicle seat which shows the example of an active head strike. It is sectional drawing of the vehicle seat which shows the example of an active headrest.

  Hereinafter, an embodiment of a vehicle seat airbag system according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an outline of a vehicle seat, FIG. 2 is a partially broken schematic perspective view of the vehicle seat viewed from the rear, FIG. 3 is an operation explanatory view of the vehicle seat when an impact occurs, and FIG. It is a control circuit block diagram of a vehicle seat airbag system. In each figure, the arrow F indicates the vehicle body front direction, and the arrow W indicates the vehicle width direction.

  As shown in FIG. 1, a front seat 10 and a rear seat 55, which are vehicle seats, are arranged side by side on the floor 1 in the passenger compartment. The front seat 10 is supported on the floor 1 and is supported by the seat back 11, the seat cushion 11 supporting the buttocks of the seated person Pf, the seat back 20 supporting the upper body Pb extending from the waist to the chest of the seated person Pf, and the seat back 20. The headrest 45 is provided. While the vehicle is being driven, the head Ph of the seated person Pf can be applied to the headrest 45. However, since this makes it difficult to perform the driving operation, the head Ph of the seated person Pf is usually slightly separated from the headrest 45. Sit down.

  As shown in FIGS. 1 and 2, in the front seat 10, a plurality of erection elastic support members 27 are stretched inside the seat back frame 21 that forms the skeleton of the seat back 20. A seat pad 28 is disposed on the front surface of the air bag 30, and an airbag 30 is disposed in a contracted state behind the erection elastic support member 27, and these are entirely covered with a bag-shaped skin 31.

  The seat back frame 21 is a U-shaped or U-shaped configuration comprising an upper frame 22 extending in the vehicle width direction and a pair of side frames 23 that are curved or bent from both ends of the upper frame 22 and extend downward. A pipe frame, a pair of left and right side brackets 24 arranged and fixed at the side end of each side frame 23, and a pipe-like upper portion extending in the vehicle width direction and installed near the upper end of each side frame 23 The cross member 25 and the lower cross member 26 installed between the lower ends of the left and right side brackets 24 are formed in a substantially rectangular frame shape.

  There are a plurality of erection elastic support members 27 such as S springs made of metal wires between the inner sides of the opposed side frames 23 and the inner side of the side brackets 24, and in this embodiment, three erection elastic support members 27 are provided. It is stretched and stretched between approximately equal places. A seat pad 28 made of a urethane foam material or the like that elastically supports the upper body Pb of the seated person Pf is disposed on the front surface of the erection elastic support member 27, and is folded in a rectangular flat shape behind the erection elastic support member 27. The contracted airbag 30 is disposed.

  The front portion 32 and the air that covers the front surface of the seat pad 28 with fabric (woven fabric, knitted fabric, non-woven fabric) or leather (natural leather, synthetic leather) that can expand and contract the entire seat back frame 21, seat pad 28, airbag 30 and the like. The seat back 20 is formed by covering with a skin 31 formed in a bag shape having a back surface portion 33 covering the bag 30. For example, the airbag 30 is held on the skin 31 and the like by a locking means (not shown) so as to be inflatable and deployable. A gas introduction part (not shown) is provided in the airbag 30 and is connected to an inflator 29 attached to the side bracket 24. .

  The base ends of the side brackets 24 constituting the seat back frame 21 of the seat back 20 are attached to the rotating arm 16 of the reclining device 15 disposed at the rear end of the seat cushion 11 by screwing the mounting bolts 17. The back frame 21 is integrally connected to the rotating arm 16 of the reclining device 15.

  The airbag 30 is configured to be inflated and deployed instantaneously in a plane based on the inflation gas injection of the inflator 29, and the airbag 30 has an orifice (not shown) that discharges internal gas to the outside. The orifice is set to have a hole diameter and a number that gradually release the internal gas under compression after the airbag 30 is inflated and deployed.

  According to such a configuration, the bending elastic deformation of the erection elastic support member 27 and the seat pad 28 stretched in the seat back frame 21 disposed in the seat back 20 is secured, and the seating in the normal seating state is achieved. The elastic support of the person Pf is obtained, and good seating properties can be secured.

  On the other hand, when the airbag 30 is inflated and deployed between the erection elastic support member 27 and the back surface portion 33 of the skin 31 under the inflation gas injection of the inflator 29, as shown in FIG. The upper part Pb of the seated person Pf can be elastically pressed and supported from the back side by pressing and urging the seat pad 28 forward, and the back part 33 of the epidermis 31 bulges rearward so that the back of the seat back 20 The applied impact force is elastically received and deployed. The airbag 30 is inflated and deployed by the elastic support member 27 that holds the airbag 30 and the back surface portion 33 of the skin 31 that expands and bulges, and the deployment behavior is controlled to maintain stable inflation and deployment. The The airbag 30 is inflated and deployed by pushing and expanding the erected elastic support member 27 that holds and stretches the airbag 30 and the back surface portion 33 of the skin 31 that expands and bulges. In addition, a shock absorbing stroke in the longitudinal direction of the vehicle body can be secured.

  As shown in FIGS. 1 and 2, an active headrest 40 in which the headrest 45 is displaced back and forth by the headrest displacement means 41 is provided on the upper frame 22 of the seat back frame 21.

  The headrest displacing means 41 has a pair of left and right cylindrical stay brackets 42 held on the upper frame 22 so as to be swingable in the front-rear direction, and an actuator that selectively drives the stay brackets 42 to a normal position and a predetermined position. The headrest drive motor 43 is provided. The headrest 45 is attached to the upper portion of the seat back 20 by inserting and locking the stays 44 attached to the headrest 45 via the headrest holders with the headrest holders interposed therebetween.

  Accordingly, the headrest 45 is restrained from the rear as indicated by the imaginary line 45a from the normal position slightly away from the head Ph of the seated person Pf shown in FIG. 1 by the drive control of the headrest drive motor 43. Then, it is displaced to a predetermined position that protects it in a supportable manner, and is displaced from the predetermined position to the normal position.

  FIG. 4 shows a control circuit of the vehicle airbag system. The control circuit includes a control unit 50 that controls the inflation and deployment of the airbag 30, and the control unit 50 generates a collision from a rear collision detection sensor 51 that is a collision prediction means for predicting a rear collision and a shock load due to the rear collision. The headrest 45 is configured to control the inflator 29 in accordance with information, the position of the headrest 45 constituted by a position sensor or the like, that is, the headrest position information of the headrest position sensor 52 that detects the normal position or the predetermined position, and the program stored in the ROM 53. Drive control of the drive motor 43 is performed.

  Here, the control unit 50 has a built-in timer, and starts the timer from the point of time when the collision is predicted to measure time. The rear collision detection sensor 51 includes, for example, a distance sensor such as a millimeter wave sensor, and predicts a rear collision by measuring a relative distance and a relative speed between the own vehicle and another vehicle that may cause a rear collision. To do.

  Further, the rear collision detection sensor 51 predicts an impact load when the predicted rear collision occurs.

  In addition, the control unit 50 determines whether or not the impact load predicted by the rear impact detection sensor 51 exceeds a predetermined value, and when determining that the impact load exceeds the predetermined value, the predicted rear impact is detected. In addition to the control means for inflating and deploying the airbag 30 based on the occurrence, when the headrest 45 is in the normal position based on the headrest position information of the headrest position sensor 52, the airbag 30 is displaced to a predetermined position.

  The operation of the vehicle airbag system configured as described above will be described.

  In a vehicle equipped with the vehicle airbag system, when the rear collision detection sensor 51 predicts a rear collision with an impact load exceeding a predetermined value, the control unit 50 determines the headrest position of the headrest position sensor 52 according to the collision occurrence information. When the headrest 45 is in the normal position based on the information, the headrest drive motor 43 is driven and controlled to displace the headrest 45 to a predetermined position. Simultaneously with the displacement of the headrest 45, a drive signal is output from the control unit 50 to the inflator 29, and inflation gas is ejected from the inflator 29 to start inflation and deployment of the airbag 30.

  When the airbag 30 is inflated and deployed, the airbag 30 that inflates and deploys between the erected elastic support member 27 and the back surface portion 33 of the outer skin 31 allows the seated person Ph to pass through the erected elastic support member 27 and the seat pad 28. The upper body Pb is pressed from behind and takes an appropriate sitting posture, and the head Ph is restrained by the headrest 45 displaced to a predetermined position. Thereby, the load which acts on the neck part at the time of a collision is reduced, and generation | occurrence | production of the whiplash injury of seated person Pf can be suppressed.

  Further, as shown in FIG. 3, the airbag 30 that inflates and deploys between the erected elastic support member 27 and the back surface portion 33 of the outer skin 31 causes the rearward movement of the upper body Pb of the seated person Pf of the front seat 10 by the rear impact. Is elastically received by the airbag 30 via the front surface portion 32 of the skin 31, the seat pad 28, and the erection elastic support member 27, and rearward movement is restricted.

  On the other hand, the seated person Pr of the rear seat 55 moves in a straight line forward by reversing the vehicle body due to a rear collision or moving backward and pressing the seat back, and for example, the knee is a seat of the front seat 10. An impact force F <b> 1 is applied to the back surface of the front seat 10 in contact with the back surface of the back 20. At this time, the knee is elastically received by the airbag 30 inflated and deployed between the erection elastic support member 27 and the skin 31 to restrict the forward movement, and the impact force F1 due to the knee of the seated person Pr of the rear seat 55 is generated. It is avoided and the occupant Pf of the front seat 10 is protected. Similarly, the knee of the seated person Pr of the rear seat 55 that moves forward is elastically received and protected by the airbag 30 that is inflated and deployed.

  In the above description, when the rear collision detection sensor 51 predicts the occurrence of a rear collision, based on the collision occurrence information, the control unit 50 simultaneously expands and deploys the airbag 30 in conjunction with the displacement of the headrest 45 to a predetermined position. However, after the headrest 45 is displaced to a predetermined position and the head Ph of the seated person Pf is restrained by the headrest 45, the airbag 30 can be inflated and deployed.

  That is, when the rear collision detection sensor 51 predicts a rear collision with an impact load of a predetermined value or more, the control unit 50 controls the headrest driving motor 43 based on the headrest position information of the headrest position sensor 52 to control the headrest 45. Is displaced from the normal position to a predetermined position. Accordingly, before the airbag 30 is inflated and deployed, the headrest Ph is restrained by the headrest 45 so that the seating posture of the seated person Pf is made appropriate, so that when the rear collision occurs, the upper body Pb of the seated person Pf due to inertia. Thus, the head Ph is supported by the headrest 45 and the load acting on the neck is reduced, and the occurrence of the whiplash injury of the seated person Pf can be suppressed.

  Thereafter, with the head Ph of the seated person Pf being restrained by the headrest 45, the airbag 30 starts inflating and deploying between the erection elastic support member 27 and the back surface portion 33 of the skin 31. As a result, the rearward movement of the upper body Pb of the seated person Pf on the front seat 10 due to the rear impact is satisfactorily elastically received by the airbag 30 via the seat pad 28 and the erection elastic support member 27, and the rearward movement is restricted. Is done.

  On the other hand, the seated person Pr of the rear seat 55 moves forward and, for example, the knee comes into contact with the back of the seat back 20 of the front seat 10 and applies an impact force F1 to the back of the front seat 10. At this time, the knee is elastically received by the inflated and deployed airbag 30 and the forward movement is restricted, and the upper body Pb of the seated person Pf of the front seat 10 avoids the impact force F1 due to the knee of the seated person Pr. The seat seat 10 seated person Pf is protected. Similarly, the knee of the seated person Pr of the rear seat 55 that moves forward is elastically received and protected by the airbag 30 that is inflated and deployed.

  Further, when the rear collision detection sensor 51 predicts the occurrence of a rear collision, the control unit 50 starts to inflate and deploy the airbag 30 based on the collision occurrence information, and after the airbag 30 starts to inflate and deploy, the headrest 45 Can be displaced to a predetermined position.

  That is, when the rear collision detection sensor 51 predicts a rear collision with an impact load exceeding a predetermined value, the control unit 50 starts to inflate and deploy the airbag 30 and then uses the headrest position information of the headrest position sensor 52 as headrest position information. Based on this, the headrest drive motor 43 is driven and controlled to displace the headrest 45 to a predetermined position.

  Accordingly, the airbag 30 is started to be inflated and deployed in advance, and the back surface of the upper body Pb of the seated person Pf is pressed by the airbag 30 that is inflated and deployed to bring the seating posture into an appropriate state, and the headrest 45 is brought into a predetermined position. Displacement restrains the head Ph of the seated person Pf. Thereafter, the airbag 30 is further inflated and deployed. Thus, the rearward movement of the upper body Pb of the front seat 10 seated person Pf due to the rear impact is favorably elastically received by the airbag 30 via the seat pad 28 and the erection elastic support member 27, and the rearward movement is restricted. The

  On the other hand, the occupant Pr of the rear seat 55 moves forward due to a rear collision, and for example, the knee abuts on the back of the seat back 20 of the front seat 10 and gives an impact force F1 to the back of the front seat 10. To do. At this time, the knee is elastically received by the inflated airbag 30 and the forward movement is restricted, and the upper body Pb of the seated person Pf of the front seat 10 is seated while the impact force F1 due to the knee of the seated person Pr is avoided. The person Pf is protected. Similarly, the knee of the seated person of the rear seat 55 that moves forward is elastically received and protected by the airbag 30 that is inflated and deployed.

  In the present embodiment, when the impact load at the time of occurrence of the rear impact predicted by the collision detection sensor 51 is equal to or less than a predetermined value, the airbag 30 is configured not to be inflated and deployed, so that the impact is relatively reduced. Inflation and deployment of the airbag 30 at the time of a small collision can be omitted, and simplification such as maintenance accompanying the inflation and deployment of the unnecessary airbag 30 can be obtained.

  According to the embodiment described above, the head 30 of the seated person Pf is moved by displacing the headrest 45 to a predetermined position with a simple configuration in which the inflation and deployment of the airbag 30 in the seatback 20 and the displacement of the headrest 45 are controlled in conjunction with each other. By restraining the portion Ph and suppressing the occurrence of a whiplash injury, the airbag 30 is inflated and deployed to elastically receive the rearward movement of the seated person Pf due to the collision, and from the rear impact force F1 to the seated person Pf It is possible to protect the seat occupant Pf directly at the airbag 30 at the time of collision and to accurately reduce the impact from the rear of the seat back 20 without complicating the configuration.

  In the above embodiment, the example in which the airbag inflation and deployment control and the headrest operation control are performed based on the occurrence of the collision predicted by the collision prediction unit that predicts the collision has been described. However, the collision detection unit that detects the collision of the vehicle. It is also possible to control the inflation and deployment of the airbag and the operation of the headrest based on the collision detection by the collision detection means.

  In addition, this invention is not limited to the said embodiment, A various change can be made in the range which does not deviate from the meaning of invention. For example, in the above-described embodiment, the headrest 45 is displaced by driving the headrest drive motor 43. However, the headrest displacement means may be configured by another actuator mechanism.

  As an example, an example of a headrest displacement means using an inflator will be described with reference to FIG. Note that components corresponding to those in FIGS. 1 to 4 and the like are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5 is a longitudinal sectional view of the vehicle seat corresponding to FIG. 1. The vehicle seat includes the seat cushion 11 and the seat back 20 in the same manner as described above. A plurality of erection elastic support members 27 are stretched, a seat pad 28 is disposed on the front surface of the erection elastic support member 27, and an airbag 30 is disposed in a contracted state behind the erection elastic support member 27. Covered with a bag-like skin 31.

  An inflator 29 for inflating and deploying the airbag 30 is provided on the side bracket 24 of the seat back frame 21. An active headrest 60 is provided on the upper frame 22 of the seat back frame 21.

  The headrest displacing means 61 of the active headrest 60 has a cylindrical stay bracket 62 provided on the upper frame 22, and the headrest 65 is fixed by inserting and locking a stay 64 attached to the headrest 65 to the stay bracket 62. It is mounted on the upper part of the seat back 20.

  The headrest 65 is divided into a front cushion part 65A fixed to the stay 64 and a front cushion part 65B provided to be movable forward with respect to the rear cushion part 65A. A headrest airbag 66 is disposed between 65B and 65B. By inflating and deploying the headrest airbag 66, the front cushion portion 65B is separated from the normal position and displaced to a predetermined position in front. A gas pipe 67 branched from the gas introduction part of the airbag 30 is connected to the headrest airbag 66.

  As a result, when a rear collision is predicted by the rear collision detection sensor 51, when the inflator 29 is operated based on the collision occurrence information, the airbag 30 is inflated and deployed, and the headrest airbag 66 is indicated by a virtual line 66a. The front cushion portion 65B is displaced to a predetermined position indicated by a virtual line 66Ba and restrains the seated person's head.

  Further, an example in which the headrest displacement means is constituted by the airbag 30 that is inflated and deployed will be described with reference to FIG. FIG. 6 is a longitudinal sectional view of the vehicle seat corresponding to FIG. 1, and the vehicle seat includes the seat cushion 11 and the seat back 20 as described above, and the seat back frame 21 that forms the skeleton of the seat back 20. A plurality of erection elastic support members 27 are stretched inward, a seat pad 28 is disposed on the front surface of the erection elastic support member 27, and the whole is covered with a bag-shaped skin 31.

  An active headrest 70 is provided on the upper frame 22 of the seat back frame 21. The headrest displacing means 71 of the active headrest 70 has a pair of cylindrical stay brackets 72 held by the upper frame 22 so as to be swingable in the front-rear direction, and a distal end 73 a at the lower end of the stay bracket 72 is located above the airbag 30. A lever 73 that abuts and is pushed by the inflation and deployment of the airbag 30 to swing the stay bracket 72 from the normal position to a predetermined position is provided. The headrest 75 is mounted on the upper portion of the seat back 20 by inserting and locking the stay 74 mounted on the headrest 75 to each headrest bracket 72.

  Accordingly, when the rear collision detection is predicted by the rear collision detection sensor 51, the airbag 30 is inflated and deployed by operating the inflator 29 based on the collision occurrence information. When pressed, the stay bracket 72 swings from the normal position to a predetermined position, and the headrest 75 is displaced to a predetermined position indicated by an imaginary line 75a to restrain the head of the seated person.

10 Front seat (vehicle seat)
20 Seatback 27 Erecting Elastic Support Member 29 Inflator 30 Airbag 31 Skin 40 Active Headrest 41 Headrest Displacement Means 43 Headrest Drive Motor 45 Headrest 50 Control Unit 51 Rear Impact Detection Sensor (Collision Prediction Means)
60 Active headrest 61 Headrest displacement means 65 Headrest 65A Rear cushion part 65B Front cushion part 66 Headrest airbag 70 Active headrest 71 Headrest displacement means 75 Headrest

Claims (7)

In a vehicle seat airbag system that is installed on the upper side of the seatback and includes headrest displacement means for displacing the headrest to a predetermined position in response to a collision, and inflating and deploying the airbag inside the seatback,
The inflating and deploying in the seat back is achieved by the inflated and inflated airbag elastically supporting the upper body of the seated person, and the back of the seat back is inflated rearward by the airbag to the back of the seat back. It is performed to elastically receive the applied impact force,
The vehicle airbag system according to claim 1, wherein the inflation and deployment of the airbag in the seat back and the displacement of the headrest corresponding to the collision are controlled in conjunction with each other. A control unit for controlling the inflation and deployment of the airbag and the displacement of the headrest;
A collision prediction means for predicting a collision with a vehicle,
The linked control is
Wherein the control unit is made such that the headrest was displaced to the predetermined position, to initiate inflation and deployment of the airbag in the displacement and simultaneously the Shitoba' the click according collision information foreseen by the collision prediction means The vehicle seat airbag system according to claim 1. A control unit for controlling the inflation and deployment of the airbag and the displacement of the headrest;
A collision prediction means for predicting a collision with a vehicle,
The linked control is
Claims, characterized in that said control unit displaces said headrest to the predetermined position in accordance with a collision occurrence information is predicted by the collision prediction means is adapted to inflate and deploy the air bag within the Shitoba' click after displacement Item 12. The vehicle seat airbag system according to Item 1. A control unit for controlling the inflation and deployment of the airbag and the displacement of the headrest;
A collision prediction means for predicting a collision with a vehicle,
The linked control is
And wherein the control unit is made such that the starts inflation and deployment of the airbag in Shitoba' the click, to displace the head restraint to the predetermined position after the start accordance collision information foreseen by the collision prediction means The vehicle seat airbag system according to claim 1. The linked control is
The control unit starts to inflate and deploy the airbag in the seat back according to the collision occurrence information predicted by the collision prediction means, and after the start, displaces the headrest to the predetermined position, and then further moves the airbag. The vehicle seat airbag system according to claim 4, wherein the vehicle seat airbag system is inflated and deployed. Vehicle seat air according to any one of claims 2-5 collision load foreseen by the collision prediction means in the case of less than a predetermined value, characterized in that it is prohibited to inflation and deployment of the air bag Bag system. The airbag is disposed between a plurality of erected elastic support members that are stretched on a seat back frame that forms a skeleton of the seat back, and a skin that forms the back surface of the seat back. Item 7. The vehicle seat airbag system according to any one of Items 1-6.