JP2019147426A - Vehicle occupant protection device - Google Patents

Abstract

To obtain a vehicle occupant protection device which can properly restrain an occupant under various conditions.SOLUTION: An occupant protection device 10 includes: a seat airbag 12 which is housed in an upper part of a seat back 52 and covers from a shoulder part to a lumber part of a seated occupant 90 in an expanding and deploying state; a tether 16 connected to a lower end 14 side of the seat airbag 12 at one end; and a retractor 18 which draws the tether 16 to a rear lower side of a seat 50 after the seat airbag 12 expands and deploys.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle occupant protection device.

  Patent Document 1 discloses a vehicle occupant protection device housed in an upper part of a seat back of a vehicle seat. According to the vehicle occupant protection device disclosed in Patent Document 1, the airbag and the net are deployed at the time of a vehicle collision or rollover. Thereafter, the webbing connected to the airbag and the net is pulled in by the pretensioner so that the head of the occupant and the upper part of the torso are restrained.

JP 2010-126141 A

  However, in the vehicle seat disclosed in Patent Document 1 described above, depending on the occupant's physique, seating posture, and collision mode, the load tends to concentrate on the occupant's abdomen, which has a relatively low resistance value, and there is room for improvement. is there.

  Accordingly, an object of the present invention is to obtain a vehicle occupant protection device that can appropriately restrain an occupant under various conditions in consideration of the above facts.

  The occupant protection device according to claim 1 is housed in an upper portion of a seat back and covers from the front side of the seat from the front side of the seat to a seat airbag of a seated occupant in an inflated and deployed state, and a lower end of the seat airbag And a pull-in means for pulling the tether backward and downward after the inflation of the seat airbag.

  According to the occupant protection device of the first aspect, the seat airbag covering the occupant from the shoulder to the waist is inflated and deployed from the upper part of the seat back. Thereafter, a tether having one end connected to the lower end side of the seat airbag is pulled backward and downward by the pulling means. As a result, when the upper body is thrown forward or obliquely forward due to a frontal collision of the vehicle or the like, the upper body is restrained in a wide range from the shoulder to the waist of the occupant. Thus, the load which acts on a passenger | crew's upper body is disperse | distributed by the contact area of a seat airbag and a passenger | crew's upper body becoming large. Here, the “waist part” covered by the seat airbag from the front side is not necessarily the entire waist, and may be only a part of the front side of the waist (for example, the lower abdomen).

  In addition, since the movement of the upper body to the front side of the seat is suppressed by the seat airbag, the occupant's pelvis is prevented from rotating backward. The term “rearward rotation” here means that the occupant seated on the seat rotates clockwise when viewed from the left side. Therefore, the occurrence of the “submarine phenomenon” in which the upper body of the occupant enters the lower side of the airbag that is inflated and deployed toward the occupant from the front is suppressed.

  Further, since the upper body of the occupant is restrained to the seat back side by the seat airbag, the occupant is restrained without being affected by the position of the seat, the seating posture of the occupant, the orientation of the seat, and the like.

  In the occupant protection device according to a second aspect of the present invention, the pull-in means is installed on the seat lower side of the seat back than the lower end of the seat airbag when inflated and deployed.

  According to the occupant protection device of the second aspect, in the occupant protection device of the first aspect, the tether is retracted to the rear and lower side of the seat when the seat airbag is inflated and deployed. Thereby, a seat airbag will be arrange | positioned along a passenger | crew's upper body after inflation expansion | deployment. Therefore, the contact area between the seat airbag and the upper body of the occupant increases. Therefore, the upper body of the occupant can be effectively restrained to the seat back. In addition, the load (reaction force) on the upper body of the occupant is distributed.

  The occupant protection device according to a third aspect is the occupant protection device according to the first aspect, wherein the retracting means is disposed on the rear side of the front end of the seat back in the seat cushion.

  According to the occupant protection device of the third aspect, the tether is pulled toward the rear end side of the seat cushion when the seat airbag is deployed. As a result, the seat airbag to which the tether is connected is pulled toward the seat back side. Therefore, the upper body of the occupant is pressed in the seat back direction by the seat airbag. In this way, the occupant's upper body is restrained, so that the occupant's pelvis is prevented from rotating backward. Thereby, generation | occurrence | production of a submarine phenomenon is suppressed.

  The occupant protection device according to claim 4 is a seat belt comprising the sensor for predicting or detecting a frontal collision of the vehicle and a shoulder belt extended from the shoulders on the left and right sides in the occupant protection device according to claim 1. A tension applying means for applying a tension to the shoulder belt after predicting or detecting a frontal collision by a sensor, an inflator for inflating and deploying the seat airbag after the operation of the tension applying means, and an operation start of the inflator And the retracting means that operates later.

  According to the occupant protection device of the fourth aspect, at the time of a frontal collision of the vehicle, the tension applying means, the seat airbag, and the retracting means are started in order. For example, when the sensor predicts or detects a frontal collision of the vehicle, first, the operation of the tension applying means is started. Then, the upper body of the occupant is restrained at an appropriate position with respect to the seat back by the shoulder belt to which tension is applied to the tension applying means. Furthermore, the seat airbag is inflated and deployed after the operation of the tension applying means is started. Then, after the operation of the seat airbag is started, the operation of the pull-in means is started, and tension is applied to the tether connected to the seat back. In this way, the occupant's restraint is completed by controlling the operation start timing of each element.

  Although the operation start timing of each element has been described here, the operation completion timing may also be in the same order. For example, after the sensor predicts or detects (or predicts) a frontal collision of the vehicle, the operation of the tensioning means is started and completed. Thereafter, the inflation and deployment of the seat airbag is started and completed. Further, after that, the pulling means may start and complete the pulling of the tether connected to the seat airbag. In this case, since the operation of the next element starts after the operation of each element is completed, the operation of each element is surely completed. For example, it is possible to suppress the occurrence of a situation in which the inflation and deployment of the seat airbag is hindered by the influence of the tension caused by the pulled tether. Thereby, the time required for the seat airbag to restrain the occupant is further shortened.

  The occupant protection device according to a fifth aspect is the occupant protection device according to the fourth aspect, wherein the seat airbag is housed in a shoulder portion opposite to a shoulder portion from which the shoulder belt is pulled out.

  According to the occupant protection device of the fifth aspect, the seat airbag is accommodated in the shoulder portion (upper portion of the seat back) of the shoulder belt and the seat back opposite to each other in the seat width direction. This prevents the seat airbag from interfering with the shoulder belt when inflated and deployed. Thereby, the time required for the seat airbag to restrain the occupant is shortened.

  The occupant protection device according to claim 6 is the occupant protection device according to any one of claims 1 to 5, wherein a belt portion is arranged along a seat width direction on a lower end side of the seat airbag. It is installed.

  According to the occupant protection device of the sixth aspect, the belt portion disposed on the lower end side of the seat airbag along the seat width direction is pulled downward and rearward by the tether drawn by the drawing means. . Moreover, since this belt part is expand | deployed by the gravity center vicinity of a passenger | crew's pelvis, it can restrain a passenger | crew's pelvis stably. Therefore, for example, even when the occupant is not wearing a seat belt, movement of the occupant forward of the seat can be suppressed. Moreover, the belt part restrains the passenger | crew's waist | hip | lumbar part, and the rotation to the back of a pelvis can be suppressed. Thereby, generation | occurrence | production of a submarine phenomenon is suppressed.

  The occupant protection device according to claim 7 is the occupant protection device according to any one of claims 1 to 6, wherein the seat airbag includes a head protection portion that protects the head of the occupant. ing.

  According to the occupant protection device of the seventh aspect, the head protecting portion is deployed so as to cover the occupant's head when the seat airbag is inflated and deployed. Thereby, the movement to the front and a side of a passenger | crew's head is suppressed. For this reason, it is possible to suppress contact of the passenger's head with interior parts, side windows, and the like in the vehicle.

  The occupant protection device according to claim 8 is the occupant protection device according to any one of claims 1 to 7, wherein the seat airbag is located inside an end portion of the seat back in a seat width direction. The retracting means is disposed on the outer side in the width direction of the seat back with respect to the accommodating portion.

  According to the occupant protection device of the eighth aspect, the retracting means is located outside the seat back in the seat width direction. Therefore, when the airbag is deployed, the distance between the connecting portion of the tether connected to the seat airbag and the retracting means is shortened. Thereby, the time required for the tether to be pulled by the pulling means is shortened. Therefore, the time required until the seat airbag is disposed at an appropriate position with respect to the upper body of the occupant is shortened.

  Further, since the retracting means is located outside the seat back in the seat width direction, when the tether is retracted, the upper arm portion of the occupant is restrained from the outside in the seat width direction to the seat back side by the seat airbag. Thereby, a passenger | crew's upper arm part can also be protected by a seat airbag.

  Further, the retracting means is disposed on the outer side in the seat width direction than the seat airbag storage position. Therefore, when the seat airbag is deployed, the pull-in means pulls the tether, whereby the lower end side of the seat airbag is pulled in a direction in which the seat airbag is further expanded (outside in the seat width direction). As a result, the seat airbag receives tension and is disposed along the upper body of the occupant in a more appropriate inflated and deployed state.

  As described above, the occupant protection device according to claim 1 has an excellent effect that the occupant can be restrained appropriately.

  The occupant protection device according to claims 2 and 3 has an excellent effect that the upper body of the occupant can be appropriately restrained in a more stable posture.

  The occupant protection device according to claim 4 has an excellent effect that the occupant can be restrained in a shorter time.

  The occupant protection device according to claim 5 has an excellent effect that the occupant can be restrained in a short time.

  The occupant protection device according to claim 6 has an excellent effect that the occupant's lower back can be more appropriately restrained.

  The occupant protection device according to claim 7 has an excellent effect that the occupant's head can be more appropriately restrained.

  The occupant protection device according to claim 8 has an excellent effect that the occupant can be restrained in a shorter time.

It is a perspective view which shows the operating state of the passenger | crew protection apparatus which concerns on 1st Embodiment. It is a figure which shows the shape of the seat airbag of the inflated state in the passenger | crew protection apparatus which concerns on 1st Embodiment. It is a figure which shows typically a passenger | crew's upper body and seat airbag in the operating state of the passenger | crew protection apparatus which concerns on 1st Embodiment from the viewpoint from the upper surface. It is a perspective view which shows the mode at the time of accommodation of the passenger | crew protection device which concerns on 1st Embodiment from the viewpoint from a seat back. It is a mimetic diagram showing the state of inflation and deployment of a seat airbag of a crew member protection device concerning a 1st embodiment from the viewpoint from the side of a seat. It is a perspective view which shows the operating state of the passenger | crew protection apparatus which concerns on 2nd Embodiment. It is a perspective view which shows the operating state of the passenger | crew protection apparatus which concerns on 3rd Embodiment. It is a perspective view which shows the operating state of the passenger | crew protection apparatus which concerns on 4th Embodiment. It is a perspective view which shows the operating state of the passenger | crew protection apparatus which concerns on 5th Embodiment.

  Hereinafter, embodiments of an occupant protection device according to the present invention will be described with reference to the drawings. Note that an arrow FR appropriately shown in each figure indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow RH indicates the right side of the vehicle. Further, in the following description, when using the front / rear, up / down, and left / right directions, the front / rear direction of the vehicle, the up / down direction of the vehicle up / down direction, and the left / right direction in the traveling direction are indicated. Further, in the following description, unless otherwise specified, the illustrated seat is installed so that a seated occupant faces the vehicle traveling direction.

<First Embodiment>
An occupant protection device 10 according to a first embodiment will be described with reference to FIGS. FIG. 1 shows a state in which the occupant protection device 10 restrains the occupant 90 seated on the seat 50. As shown in FIG. 1, the seat airbag 12 in the occupant protection device 10 is formed in a shape that covers the upper body excluding the head of the occupant 90 from above, from the front, and from the side in an inflated and deployed state.

  The occupant protection device 10 is connected to a seat airbag 12 that is inflated and deployed from a storage portion 56 (see FIG. 4) provided at the upper back of the seat back 52, and the seat airbag 12 on the outer side in the width direction and on the lower end 14 side. The pair of left and right tethers 16 and a pair of retractors 18 (corresponding to the pulling means) for pulling the tethers 16 are configured. The retractor 18 is provided below the left and right seat side portions 54 of the seat back 52. More specifically, the retractor 18 is disposed below the lower end 14 when the seat airbag 12 is inflated and deployed in the seat side portion 54. Further, the position of the retractor 18 is on the outer side in the sheet width direction than the storage portion 56.

  The seat airbag 12 in the occupant protection device 10 includes a pair of left and right shoulder portions 20, a trunk portion 22 provided on the lower side of the shoulder portion, and a side provided on the outer side in the seat width direction of the trunk portion 22 and the shoulder portion 20. Part 24.

  The pair of left and right shoulder portions 20 in the seat airbag 12 are inflated and deployed upward and forward of the seat back 52 from a storage portion 56 (see FIG. 4) provided at the upper back of the seat back 52. Thus, the seat back 52 is inflated and deployed so as to cover the back side and the upper side of the upper part. Further, the shoulder portion 20 is inflated and deployed so as to cover the shoulder portion of the occupant 90 leaning against the seat back 52 from the upper side and the front side. By inflating and deploying in this manner, the shoulder portion 20 of the seat airbag 12 has a structure in which the shoulder portion of the occupant 90 is pressed against the seat back 52 side.

  The body portion 22 provided on the lower side of the shoulder portion 20 of the seat airbag 12 is inflated and deployed so as to press the body of the occupant 90 from the front to the seat back 52 side (seat rear). The length in the width direction of the body portion 22 of the seat airbag 12 is substantially the same as the length in the width direction of the seat back 52. Further, the lower side of the seat airbag 12 is formed so that the body portion 22 of the seat airbag 12 can cover up to the lower end of the abdomen of the occupant 90.

  In addition, the end portion on the inner side in the seat width direction of the pair of left and right shoulder portions 20 and the upper end portion of the body portion 22 integrally form a head insertion portion 30. The length of the head insertion portion 30 in the seat width direction is set to be longer than the length of the headrest 32 in the seat width direction. Accordingly, the head 92 and the headrest 32 of the occupant 90 can pass through the head insertion part 30 when the seat airbag 12 is inflated and deployed.

  As shown in FIG. 1, a pair of left and right side portions 24 are provided on the outer side in the seat width direction of the shoulder portion 20 and the trunk portion 22 of the seat airbag 12. The side part 24 in the seat airbag 12 is inflated and deployed so as to cover the front part on the outer side in the seat width direction from the upper part to the lower part of the seat side part 54 of the seat back 52. At the time of restraining the occupant, the arm of the occupant 90 is restrained from the front side and the outer side in the width direction of the seat 50 by the trunk portion 22 and the side portion 24 of the seat airbag 12.

  Here, an outline of the seat 50 in which the occupant protection device 10 is stored will be described. As shown in FIG. 1, the seat 50 includes a seat cushion 58 on which an occupant 90 is seated, a seat back 52 that supports the upper body of the occupant 90 from behind, and a headrest 32 that supports a head 92 of the occupant 90. Yes. A side frame 68 (see FIG. 4) is provided at a lower portion of the seat cushion 58 on the outer side in the seat width direction. A slide rail upper 62 is connected to the lower side of the side frame 68 via a rail fixing portion 60. The lower portion of the slide rail upper 62 is supported by the slide rail lower 64 so that it can slide back and forth. Further, the lower portion of the slide rail lower 64 is fixed on the floor of the passenger compartment via a fixing bracket 66.

  As shown in FIG. 1, in the first embodiment, the seat 50 is provided with a seat belt 70 with a built-in seat. The seat belt 70 includes a buckle (not shown) provided on a side surface of the seat cushion 58 on the other side from a seat belt retractor 78 (corresponding to a tension applying means) provided on an upper portion on one side in the width direction of the seat back 52. A shoulder belt 72 is provided. Further, the seat belt 70 has a wrapped belt 74 disposed from a buckle (not shown) to an anchor plate 76 provided on the other side surface of the seat cushion 58. The seat belt retractor 78 also has a pretensioner and has a structure capable of applying tension to the shoulder belt 72.

  FIG. 2 shows a state where the seat airbag 12 in the occupant protection device 10 is inflated. As shown in FIG. 2, the shoulder portion 20, the trunk portion 22, and the side portion 24 of the seat airbag 12 are formed in an integral bag shape. When the seat airbag 12 is inflated and deployed, inflation gas is supplied to the entire seat airbag 12 from the end portion side (the right side in FIG. 2) of the shoulder portion 20 by the inflator 26 (see FIG. 4). More specifically, when the inflation gas is supplied from the end portion side of the shoulder portion 20, the shoulder portion 20, the trunk portion 22, and the side portion 24 of the seat airbag 12 formed in an integral bag shape, Is inflated.

  FIG. 3 shows a state in which the occupant 90 is restrained by the occupant protection device 10 in a plan view. As shown in FIG. 3, the left and right side portions 24 are bent toward the rear side of the seat and inward in the width direction when the tether 16 is pulled by the retractor 18. Thereby, the outer side in the seat width direction of the arm portion of the occupant 90 is protected by the side portion 24 of the seat airbag 12.

  Next, the non-operating state of the occupant protection device 10 will be described with reference to FIG. FIG. 4 shows a state in which the occupant protection device 10 is stored as viewed from the lower left rear side of the seat 50. The seat airbag 12 is stored in a folded state in a storage portion 56 provided at the upper back of the seat back 52. Further, the tether 16 having one end fixed to the seat airbag 12 passes through the inside of the skin 82 of the seat 50 and the other end is connected to the retractor 18. More specifically, the tether 16 is disposed on the inner side of the outer skin 82 of the seat 50 from the storage portion 56 to the seat side portion 54, and further provided below the seat side portion 54 along the seat side portion 54. To the retractor 18. Further, the skin 82 of the portion of the seat 50 where the tether 16 is disposed is provided with a breaking portion 80 for the tether 16 to break through the skin 82 of the seat 50 when the seat airbag 12 is inflated and deployed. Yes.

  The inflator 26, the pretensioner of the seat belt retractor 78 (see FIG. 1) and the retractor 18 are electrically connected to a control device 28 for controlling the operation start timing of the inflator 26 and the operation start timing of the retractor 18. The control device 28 is separately mounted inside the vehicle provided with the seat 50 (in FIG. 4, it is simply shown for explanation). Further, the control device 28 is electrically connected to a separately provided sensor 29 for predicting or detecting a collision.

(Function and effect)
Hereinafter, the operation and effect of the first embodiment will be described.

  In the occupant protection device 10 according to the first embodiment, when the collision prediction or detection sensor 29 predicts or detects a frontal collision of the vehicle, the control device 28 receives an electrical signal. Then, an electrical signal is transmitted from the control device 28 to the pretensioner of the seat belt retractor 78. Tension is applied to the shoulder belt 72 by the pretensioner of the seat belt retractor 78 that has received this electrical signal. Due to the applied tension, the upper body of the occupant 90 is pressed toward the seat back 52 side.

  Next, the inflator 26 is operated by the control device 28, and the inflation gas is supplied to the seat airbag 12. Here, in FIG. 5, the state of the inflation and deployment of the seat airbag 12 in the occupant protection device 10 according to the first embodiment is schematically shown from the viewpoint from the left side of the seat 50. For the sake of explanation, the occupant 90, the headrest 32, and the parts for connecting the seat 50 and the passenger compartment floor are omitted.

  As shown in FIG. 5, the seat airbag 12 to which the inflation gas is supplied by the inflator 26 is inflated from a storage portion 56 provided on the back surface of the seat back 52. The inflated seat airbag 12 is inflated and deployed upward and forward of the seat 50.

  When the seat airbag 12 is inflated and deployed to be in the state of the seat airbag 12a indicated by the alternate long and short dash line in FIG. 5, the tether 16 connected to the seat airbag 12a is stretched to become the tether 16a state. At this time, the tether 16 (16 a) is pulled out to the outside of the skin 82 of the sheet 50 while cleaving the skin 82 along the breaking portion 80 provided on the skin 82 of the sheet 50.

  Further, an electrical signal is transmitted from the control device 28 to the retractor 18. The retractor 18 that has received the electrical signal starts the pull-in operation of the tether 16a. Here, the seat airbag 12b and the tether 16b indicated by a two-dot chain line in FIG. 5 show a state in which the tether 16 (16a) is being pulled by the retractor 18. When the winding of the tether 16 (16a) by the retractor 18 is completed, the seat airbag 12 is disposed in a state of being pulled toward the seat back 52 so as to cover the upper body of the occupant 90. Further, when the tether 16 is pulled backward and downward by the retractor 18, the side portion 24 of the seat airbag 12 is bent backward (see FIG. 3).

  Thus, the respective operations are started in the order of the winding operation (tension applying means operation) of the shoulder belt 72, the inflator 26, and the retractor 18, so that the respective operations are smoothly performed without interfering with each other. Done. As a result, the time required from the prediction or detection of the collision to the completion of the restraint of the occupant 90 by the occupant protection device 10 can be shortened.

  Further, according to the occupant protection device 10 according to the first embodiment, since the upper body of the occupant 90 is restrained so as to be covered by the seat airbag 12, the load at the time of collision is locally applied to the abdomen of the occupant 90, for example. Can be avoided. Furthermore, according to the occupant protection device 10 according to the first embodiment, the seat airbag 12 that protects the occupant 90 is inflated and deployed from the seat 50 on which the occupant 90 is seated. The passenger 90 can be protected without being affected.

  In the occupant protection device 10 according to the first embodiment, only the operation start timing of each element has been described with respect to the winding operation (tension applying operation) of the shoulder belt 72, the inflator 26, and the retractor 18. However, the operation start timing of each element may be after the operation start and completion of the previous element.

  Further, in the occupant protection device 10 according to the first embodiment, the position of the retractor 18 that pulls in the tether 16 is lower than the lower end 14 of the seat airbag 12 at the time of inflating and deploying and the seat is more than the storage portion 56. It is arranged outside in the width direction. As a result, the seat airbag 12 connected to the tether 16 can pull the end portion of the seat back 52 outward in the seat width direction and downward. That is, the seat airbag 12 can be pulled so as to properly cover the upper body of the occupant 90.

  In the present embodiment, it has been described that the position of the retractor 18 is provided below the lower end 14 of the seat side portion 54 when the seat airbag 12 is inflated and deployed. However, according to variations in the shape of the seat 50. Various modifications are possible. For example, when the shape of the seat 50 is such that the rear end side of the seat cushion 58 is disposed below the seat back 52, the retractor 18 can be installed near the rear end portion of the seat cushion 58. It is. In this case, since the retractor 18 is disposed behind and below the lower end 14 of the seat airbag 12 during inflation and deployment, an appropriate tension can be applied to the tether 16 and the seat airbag 12.

Second Embodiment
Next, an occupant protection device 10 according to the second embodiment will be described with reference to FIG. The second embodiment is a modification of the first embodiment. Therefore, configurations and operations common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  FIG. 6 shows a state where the occupant protection device 10 according to the second embodiment restrains the occupant 90 seated on the seat 50. Here, the second embodiment is different from the first embodiment in that the seat 50 is not provided on the seat 50. In the second embodiment, a belt portion 84 having a high tensile strength is stretched integrally with the seat airbag 12 in the seat width direction at the lower end 14 of the seat airbag 12. Since the belt portion 84 is disposed at the lower end 14 of the seat airbag 12, the belt portion 84 is disposed in the vicinity of the center of gravity position of the occupant 90 on the pelvis when the occupant 90 is restrained.

(Function and effect)
Hereinafter, the operation and effect of the second embodiment will be described.

  In the passenger protection device 10 according to the second embodiment, when the collision prediction or detection sensor 29 predicts or detects a frontal collision of the vehicle, the control device 28 receives an electrical signal from the sensor 29. Then, an electrical signal is transmitted from the control device 28 to the inflator 26 of the seat airbag 12. Thereby, the inflation and deployment operation of the seat airbag 12 is started. Since the subsequent operations and operations of the tether 16, the retractor 18, and the side portion 24 of the seat airbag 12 are the same as those in the first embodiment, description thereof will be omitted.

  Here, as shown in FIG. 6, in the state where the occupant 90 seated on the seat 50 is restrained, the seat airbag 12 is pulled by the rear lower side of the tether 16 provided on the left and right lower ends. Tension is applied to the lower end in the sheet width direction outside. At this time, tension is also applied in the seat width direction to the belt portion 84 that spans the lower end of the seat airbag 12. Here, since the belt portion 84 has a tensile strength, a reaction force is generated in a direction to prevent the occupant 90 from moving the waist portion forward. The body portion 22 of the seat airbag 12 suppresses the forward tilt of the upper body of the occupant 90, and the belt portion 84 prevents the occupant 90 from moving the waist of the occupant 90. Rotation is suppressed. As described above, since the waist (pelvis) of the occupant 90 is stably restrained, the upper body of the occupant 90 is appropriately secured by the seat airbag 12 including the belt portion 84 even though the seat belt is not worn. It will be restrained by.

  Further, in the occupant protection device 10 according to the second embodiment, when the occupant 90 is restrained, the belt portion 84 restrains the vicinity of the center of gravity of the occupant 90 in the pelvis, so that the rotation of the occupant 90 to the rear of the pelvis is suppressed. be able to. Here, “rotation to the rear of the pelvis” means that the pelvis of the occupant 90 seated on the seat 50 rotates clockwise. As a result, it is possible to prevent the upper body of the occupant 90 from tilting forward or the upper body of the occupant 90 from entering the space in the lower front part of the passenger compartment (for example, the submarine phenomenon). Therefore, even when the vehicle 90 collides in a state where the occupant 90 is not wearing the seat belt 70, the occupant 90 is appropriately restrained and protected by the occupant protection device 10.

<Third Embodiment>
Next, an occupant protection device 10 according to a third embodiment will be described. The third embodiment is a modification of the first and second embodiments. Therefore, configurations and operations common to the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  FIG. 7 shows a state in which the occupant 90 seated on the seat 50 is restrained by the occupant protection device 10 according to the third embodiment. As shown in FIG. 7, in the occupant protection device 10 according to the third embodiment, the seat airbag 12 is provided with a head protection portion 86 that covers the head 92 of the occupant 90 from the front and side. . The head protecting portion 86 is formed in a bag shape integral with the seat airbag 12. Therefore, when the inflation gas is supplied to the seat airbag 12 by the inflator 26, the head protection part 86 is also inflated together with the body part 22 and the side part 24.

(Function and effect)
Hereinafter, the operation and effects of the third embodiment will be described.

  In the passenger protection device 10 according to the third embodiment, when the collision prediction or detection sensor 29 predicts or detects a frontal collision of the vehicle, the control device 28 receives an electrical signal from the sensor 29. Then, an electrical signal is transmitted from the control device 28 to the seat belt retractor 78. Thereby, the operation of the pretensioner of the seat belt retractor 78 is started. After the operation of the pretensioner of the seat belt retractor 78 is started, an electric signal is transmitted from the control device 28 to the inflator 26 of the seat airbag 12. Thereby, the inflation and deployment operation of the seat airbag 12 is started. At this time, the inflating and deploying operation is also started for the head protecting portion 86 formed in a bag shape integral with the seat airbag 12. Since the subsequent operations and operations of the tether 16, the retractor 18, and the side portion 24 of the seat airbag 12 are the same as those in the first embodiment, description thereof will be omitted.

  In the occupant protection device 10 according to the third exemplary embodiment, the head 92 of the occupant 90 is covered by the head protection unit 86 from the front and side when the occupant 90 is restrained. Thereby, the head 92 of the passenger 90 is appropriately protected and restrained.

<Fourth embodiment>
Next, an occupant protection device 10 according to the fourth embodiment will be described. The fourth embodiment is a modification of the first to third embodiments. Therefore, about the structure and operation | movement common to 1st-3rd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  FIG. 8 shows a state in which the occupant 90 seated on the seat 50 is restrained by the occupant protection device 10 according to the fourth embodiment. As shown in FIG. 8, in the occupant protection device 10 according to the fourth embodiment, the seat belt 70 is attached to a pillar (not shown) in the vehicle, not the seat 50 on which the occupant 90 is seated. Moreover, the seat airbag 12 has a shape in which the shoulder portion 20 disposed on the upper end side of the shoulder belt 72 of the seat belt 70 is omitted as compared with the first to third embodiments.

(Function and effect)
Hereinafter, the operation and effects of the fourth embodiment will be described.

  In the occupant protection device 10 according to the fourth embodiment, when the collision prediction or detection sensor 29 predicts or detects a frontal collision of the vehicle, the control device 28 receives an electrical signal from the sensor 29. Then, an electrical signal is transmitted from the control device 28 to a pretensioner (not shown) of a seat belt retractor provided on a pillar (not shown). Thereby, the operation of the pretensioner (not shown) of the seat belt retractor is started. Then, after the operation of the pretensioner of the seat belt retractor 78 is started, an electric signal is transmitted from the control device 28 to the inflator 26 of the seat airbag 12. Thereby, the inflation and deployment operation of the seat airbag 12 is started. Since the subsequent operations and operations of the tether 16, the retractor 18, and the side portion 24 of the seat airbag 12 are the same as those in the first embodiment, description thereof will be omitted.

  In the occupant protection device 10 according to the fourth embodiment, unlike the first and third embodiments, the occupant restraint seat belt 70 is routed from a pillar (not shown) instead of the seat 50. Therefore, it is necessary to form the seat airbag 12 so as to prevent interference between the seat airbag 12 and the seat belt 70 when the seat airbag 12 is inflated and deployed forward from the back surface of the seat back 52. In this regard, in the occupant protection device 10 according to the fourth embodiment, the seat belt 70 is disposed on the upper end side of the shoulder belt 72 of the seat airbag 12 in the restraint state of the occupant 90. The shape is omitted. Thereby, the seat airbag 12 is inflated and deployed from the upper side to the front side of the seat back 52 opposite to the shoulder belt 72 in the seat width direction at the time of inflation and deployment. Therefore, the seat airbag 12 is inflated and deployed without interfering with the seat belt 70 (particularly the shoulder belt 72) drawn from the pillar (not shown). Therefore, in the occupant protection device 10 according to the fourth embodiment, the seat airbag 12 appropriately restrains the occupant 90 even when the seat belt 70 is routed from a pillar (not shown) instead of the seat 50. can do. In addition, since the action | operation and operation | movement of the tether 16, the retractor 18, and the side part 24 of the seat airbag 12 are the same as that of 1st Embodiment, description is abbreviate | omitted.

<Other aspects>
The occupant protection device 10 according to each embodiment has been described above, but it is needless to say that the occupant protection device 10 can be implemented in various modes without departing from the gist of the present invention.

  For example, in the fourth embodiment, the seat airbag 12 has a shape in which one of the left and right shoulders 20 is omitted with respect to a structure in which the seat belt 70 is routed from a pillar (not shown). Not limited to this, as shown in FIG. 9, it may have a shape including both left and right shoulders 20. In this case, the seat airbag 12 is different from the aspect in which the left and right shoulder portions 20 are inflated and deployed from the storage portion 56 (FIG. 1 in the first embodiment), from the shoulder belt 72 and the seat width direction opposite side to the seat front side. And inflated. Therefore, the shoulder on the shoulder belt side covers the occupant's shoulder mainly from only the front so as not to interfere with the shoulder belt 72 in the seat belt 70. As a result, the seat airbag 12 is inflated and deployed without interfering with the seat belt 70 (particularly the shoulder belt 72) drawn from the pillar (not shown), and appropriately covers the left and right shoulders of the occupant 90. Can be protected.

  In addition, the seat airbag 12 can be partially formed in a net shape in each embodiment. For example, by forming a part of the head protecting portion 86 in the third embodiment in a net shape, it is possible to secure a vent for making it easier to breathe when the occupant 90 is restrained.

  Furthermore, in each embodiment, a mechanism that adjusts the pressure of the inflation gas supplied to the seat airbag 12 according to the collision condition, the body shape, posture, age, and the like of the occupant 90 can also be provided. By adopting such a mechanism, the load applied to the occupant 90 when the occupant is restrained by the seat airbag 12 can be dispersed.

DESCRIPTION OF SYMBOLS 10 Crew protection device 12 Seat airbag 12a Seat airbag 12b Seat airbag 14 Lower end 16 Tether 16a Tether 16b Tether 18 Retractor (retraction means)
20 shoulder portion 22 trunk portion 24 side portion 26 inflator 29 sensor 52 seat back 54 seat side portion 56 storage portion 58 seat cushion 70 seat belt 72 shoulder belt 78 seat belt retractor (tension applying means)
84 Belt part 86 Head protection part

Claims (8)

A seat airbag that is housed in the upper part of the seat back and covers from the front side of the seat from the shoulder to the waist of the seated occupant in the inflated and deployed state;
A tether having one end connected to the lower end side of the seat airbag;
A pull-in means for pulling the tether backward and downward after the inflation of the seat airbag;
An occupant protection device.   2. The occupant protection device according to claim 1, wherein the pull-in means is installed on a lower side of the seat than a lower end of the seat airbag when the seat back is inflated and deployed.   The occupant protection device according to claim 1, wherein the pull-in means is installed on a rear side of a front end of the seat back in the seat cushion. A sensor for predicting or detecting a frontal collision of the vehicle;
With a seat belt including a shoulder belt extended from the shoulders on the left and right sides,
A tension applying means for applying tension to the shoulder belt after predicting or detecting a frontal collision by a sensor;
An inflator for inflating and deploying the seat airbag after starting the operation of the tension applying means;
The pull-in means that operates after the start of the operation of the inflator;
The occupant protection device according to any one of claims 1 to 3, further comprising:   The occupant protection device according to claim 4, wherein the seat airbag is housed in a shoulder portion opposite to a shoulder portion from which the shoulder belt is pulled out.   The occupant protection device according to any one of claims 1 to 5, wherein a belt portion is disposed along a seat width direction on a lower end side of the seat airbag.   The said seat airbag is a passenger | crew protection apparatus of any one of Claims 1-6 provided with the head protection part which protects a passenger | crew's head. The seat airbag is stored in a storage portion disposed at an upper portion of the seat back inside an end portion in the seat width direction of the seat back,
The occupant protection device according to any one of claims 1 to 7, wherein the pull-in means is disposed on an outer side in the width direction of the seat back than the storage portion.