JP2018062212A - Occupant protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an occupant protection device which can secure a space for mounting a rear seat airbag module which is used to protect a leg part of a rear seat side occupant during a collision of a vehicle even if only a narrow space is available at the front seat lower side.SOLUTION: A cushion airbag 22 stored in a seat cushion 14 of a front seat side vehicle seat 12 is used as a rear seat airbag module which protects lower legs L2 of a rear seat side occupant P2. The structure eliminates a need of an inflator in the rear seat airbag module, and a space for mounting the rear seat airbag module can be reduced for the reason. Therefore, even if a lower side space of a front seat side vehicle seat 12 is narrow, an additional chamber 36 serving as the rear seat airbag module can be disposed at an area located behind and below the front seat side vehicle seat 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an occupant protection device.

  Patent Document 1 discloses a technology relating to a rear seat knee airbag that is inflated and deployed from the lower side of the front seat toward the rear seat (hereinafter referred to as “inflation and deployment”). In this prior art, an airbag module for a rear seat is provided on the lower side of the front seat, gas is ejected from an inflator constituting a part of the airbag module, and the airbag is directed toward the rear seat. By expanding and deploying, the knee portion of the rear seat occupant seated on the rear seat (hereinafter simply referred to as “rear seat occupant”) is protected.

JP 2004-352037 A

  However, the above prior art requires a mounting space for installing the airbag module below the front seat. In general, the lower side of the front seat has a narrow gap with the floor portion. For this reason, when a storage case or the like is provided on the lower side of the front seat, as described above, if the airbag module is disposed on the lower side of the front seat, the mounting space for the airbag or inflator is reduced. It becomes difficult to ensure.

  In consideration of the above facts, the present invention provides a mounting space for an air bag module for a rear seat for protecting the legs of a rear seat occupant in the event of a vehicle collision even if the space below the front seat is small. An object is to obtain an occupant protection device that can be secured.

  An occupant protection device according to a first aspect of the present invention includes an inflator stored in a seat cushion of a front seat of a vehicle, and an inflator stored in the seat cushion and inflated by the operation of the inflator at the time of a vehicle collision A cushion airbag that is provided on the cushion airbag, communicates with the interior of the cushion airbag, is inflated and deployed by the operation of the inflator, and at least a lower portion and a floor portion on the back side of the seat back of the front seat And an additional chamber disposed between the two.

  In the occupant protection device according to the first aspect of the present invention, the inflator is housed inside the seat cushion of the front seat of the vehicle. A cushion airbag is housed inside the seat cushion of the front seat, and the cushion airbag is inflated by the operation of the inflator when the vehicle collides. The cushion airbag is provided with an additional chamber communicating with the interior of the cushion airbag. The additional chamber is inflated and deployed by the operation of the inflator, and at least a lower portion of the front seat at the back side of the seat back. It is arranged between the floor part. As a result, the gap between the lower portion of the back side of the seat back of the front seat and the floor portion is closed by the additional chamber.

  When the vehicle collides, the lower leg portion of the rear seat occupant is swung up forward and upward in the vehicle front-rear direction around the waist belt, which is part of the seat belt, due to inertia. As described above, when the additional chamber is inflated and deployed so as to close the gap between the lower portion of the back side of the seat back of the front seat and the floor portion at the time of a vehicle collision, the legs of the rear seat side occupant are When the vehicle moves forward in the longitudinal direction of the vehicle, it hits the additional chamber. Thereby, the movement of the leg portion of the rear seat occupant to the front side is restricted, and the leg portion of the rear seat occupant can be prevented or suppressed from colliding with the lower part of the back side of the seat back of the front seat. it can.

  That is, in the present invention, the airbag module for the front seat that is configured to include the inflator and the cushion airbag is also used as an airbag module for the rear seat that protects at least the legs of the rear seat side occupant. Can do. As a result, the mounting space of the airbag module for the rear seat can be reduced, and the airbag module for the rear seat can be disposed on the front seat side.

  As described above, according to the occupant protection device according to claim 1, even if the space below the front seat is small, the rear seat for protecting the legs of the rear seat occupant during a vehicle collision It has the outstanding effect that the mounting space of the airbag module for seats can be ensured.

It is a schematic side view schematically showing a state where a cushion airbag of a vehicle seat provided with an occupant protection device according to the present embodiment is inflated. It is a schematic plan view showing a state where the cushion airbag of the vehicle seat provided with the occupant protection device according to the present embodiment is not inflated. Schematic partial cross-section when cut along line 3-3 in FIG. 2 showing a state where the additional chamber as the main part of the vehicle seat provided with the occupant protection device according to the present embodiment is not inflated and deployed FIG. FIG. 4 is a schematic partial cross-sectional view showing an additional chamber in FIG. 3 in an enlarged manner. FIG. 4 is a schematic partial cross-sectional view showing a state where an additional chamber in FIG. 3 is expanded and deployed. It is the schematic perspective view seen from the slanting back side of the vehicular seat which shows the state where the cushion airbag of the vehicular seat provided with the occupant protection device concerning this embodiment was inflated. (A) is a modified example (1), (B) is a modified example (2), (C) is a state where an additional chamber constituting a part of the occupant protection device according to the modified example (3) is not inflated and deployed. The left figure is a schematic side view and the right figure is a schematic perspective view, respectively. It is a schematic side view corresponding to Drawing 1 showing typically the state where the cushion airbag expanded in the vehicular seat provided with the crew member protection device concerning modification (4). It is a schematic fragmentary sectional view corresponding to Drawing 3 showing the state where the cushion airbag is not inflating in the vehicular seat provided with the crew member protection device concerning modification (4). FIG. 6 is a schematic partial cross-sectional view corresponding to FIG. 4, showing a state where the cushion airbag is not inflated in the main part of the vehicle seat provided with the occupant protection device according to the modification (4). FIG. 6 is a schematic perspective view of a vehicle seat provided with an occupant protection device according to Modification (4), as seen from an obliquely rear side of the vehicle seat, showing a state in which a cushion airbag is inflated. It is a schematic side view corresponding to Drawing 1 showing typically the state where the cushion airbag expanded in the vehicular seat provided with the crew member protection device concerning modification (5). FIG. 10 is a schematic perspective view of a vehicle seat provided with an occupant protection device according to Modification (5), as seen from an oblique rear side of the vehicle seat, showing a state in which a cushion airbag is inflated. In the vehicle seat provided with the occupant protection device according to the modified example (6), it is a schematic perspective view of a state in which the cushion airbag is not inflated as viewed obliquely from the rear side.

  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 these drawings indicates a forward direction of the vehicle seat (a direction toward the seated person), an arrow UP indicates an upward direction of the vehicle seat, and an arrow RH indicates the vehicle seat. The right direction and the arrow LH indicate the left direction of the vehicle seat. Hereinafter, when simply using the front / rear, up / down, left / right directions, unless otherwise specified, the front / rear of the vehicle seat, the up / down of the vehicle seat, and the left / right of the vehicle seat when facing the traveling direction are shown. Shall.

(Configuration of passenger protection device)
First, the configuration of the occupant protection device according to the present embodiment will be described.

  As shown in FIG. 1, the vehicle seat 12 on the front seat side to which the occupant protection device (hereinafter referred to as “airbag module”) 10 according to the present embodiment is applied is in front of being seated on the front seat side. A seat cushion 14 for supporting the buttocks and thighs of the seat-side occupant P1 (hereinafter simply referred to as “front-seat-side occupant P1”, a seat back 16 for supporting the back of the front-seat occupant P1, and the front seat The headrest 18 (refer FIG. 6) for supporting the head of the side passenger | crew P1 is comprised.

  The “front seat” here is not limited to the driver seat and the passenger seat, but means a seat with other seats behind. Similarly, “rear seat” means a seat with other seats ahead.

  Here, as shown in FIG. 3, in the vehicle seat 12 on the front seat side, the seat cushion 14 is formed of a foam such as a urethane pad, and is fixed to the seat frame 20. Slide rails 21 are provided on the lower sides of both ends of the seat frame 20 in the seat width direction. The pair of left and right slide rails 21 are fixed to the floor portion 54 via a front bracket 23 provided at the front portion of the slide rail 21 and a rear bracket 25 provided at the rear portion of the slide rail 21, respectively. .

  The seat frame 20 has, for example, a substantially rectangular shape (not shown), and a plurality of S springs are bridged between the front portion and the rear portion of the seat frame 20. Furthermore, the accommodating part 27 for accommodating the air blower which sends air to the seat cushion 14 is attached to the lower part of the seat frame 20, for example. In addition, this accommodating part 27 may be utilized as a storage box etc. besides accommodating a fan.

  In addition, a cushion airbag 22 and an inflator 24 are housed inside a seat cushion 14 provided on the upper portion of the seat frame 20. As shown in FIG. 2, the inflator 24 is disposed with the seat width direction as a longitudinal direction at the center of the front end side of the seat cushion 14, and gas can be ejected from both ends of the inflator 24 in the longitudinal direction. ing.

  On the other hand, the cushion airbag 22 is formed in a bag shape by sewing, for example, a nylon or polyester cloth material. Further, the cushion airbag 22 is disposed between the seat cushion 14 and the S spring (not shown) or the seat frame 20 as shown in FIG. It is supported from below by a spring or a seat frame 20. The cushion airbag 22 may be supported by a reaction force plate instead of the S spring.

  Further, as shown in FIG. 2, the cushion airbag 22 includes a main chamber 26 and side chambers 28, 30. The main chamber 26 and the side chambers 28, 30 are respectively sewn by sewing. It is partitioned. The main chamber 26 is provided over substantially the entire region in the seat width direction at the front portion 14A of the seat cushion 14, and the side chambers 28 and 30 extend along the seat longitudinal direction at both ends of the seat cushion 14 in the seat width direction. Is provided. That is, the cushion airbag 22 in the present embodiment is not provided with a chamber at the rear and center of the seat.

  As shown in FIG. 1, for example, a collision detection sensor 32 is disposed on a front bumper (not shown). The collision detection sensor 32 is electrically connected to a vehicle ECU (control unit) 34. When a collision body collides with the front bumper, a signal is sent to the vehicle ECU 34 according to the deformation amount of the front bumper. It has become so. An inflator 24 is electrically connected to the vehicle ECU 34, and the inflator 24 can be operated via the vehicle ECU 34 by a signal from the collision detection sensor 32. When the inflator 24 is activated, gas is ejected from the inflator 24.

  As shown in FIG. 2, the gas ejected from the inflator 24 is supplied to the main chamber 26 and the side chambers 28 and 30 of the cushion airbag 22 along gas supply routes indicated by arrows A and B, respectively. That is, in the main chamber 26, as indicated by the arrow A, the gas ejected from the inflator 24 is supplied from both end sides in the sheet width direction toward the central portion. In the side chambers 28 and 30, as indicated by an arrow B, the gas ejected from the inflator 24 is supplied from the front part of the sheet toward the rear part of the sheet at both ends in the sheet width direction.

  Furthermore, in this embodiment, the cushion airbag 22 is provided with an additional chamber 36 that communicates with the side chambers 28 and 30. On the other hand, as shown in FIG. 3, the seat frame 20 is provided with a shaft 38 that constitutes a rear portion of the seat frame 20 and is disposed along the seat width direction. A rear end portion 14 </ b> B of the seat cushion 14 is disposed on the shaft 38. The side chambers 28 and 30 (see FIG. 2) are wound between the rear end portion 14B of the seat cushion 14 and the upper portion of the shaft 38, and the additional chamber 36 is disposed on the rear side and the lower side of the seat cushion 14. It is installed. That is, the vehicle seat 12 on the front seat side is disposed on the back surface 16 side and the lower side of the seat back 16.

  As shown in FIG. 6, the additional chamber 36 includes an additional chamber upper portion 40 that constitutes an upper portion of the additional chamber 36, an additional chamber lower portion 42 that communicates with the side chambers 28 and 30 and constitutes a lower portion of the additional chamber 36, It is comprised including. Furthermore, the additional chamber 36 is provided with communication portions 44 and 46 that connect the additional chamber upper portion 40 and the additional chamber lower portion 42.

  The additional chamber upper portion 40 and the additional chamber lower portion 42 are disposed over substantially the entire region in the sheet width direction, and the communication portions 44 and 46 are provided at both ends in the sheet width direction. The additional chamber upper portion 40 and the additional chamber lower portion 42 are arranged in a bellows-like folded state (so-called Z-fold) as shown in FIG. The folded portions 42A of the lower portion 42 are folded so as to be arranged along the vehicle width direction.

  As shown in FIG. 3, a plastic cover member 48 is provided across the entire region in the seat width direction from the seat cushion 14 to the seat back 16 at the rear and lower portions of the vehicle seat 12. Yes. By this cover member 48, the boundary portion between the seat cushion 14 and the seat back 16 is hidden.

  The additional chamber 36 is disposed inside the cover member 48 in a folded state, and the additional chamber 36 is not visible from the vehicle interior 50 side. Further, the cover member 48 can be broken by a weak portion (not shown) due to an impact from the additional chamber 36 when the additional chamber 36 is expanded, and the additional chamber 36 is expanded toward the vehicle interior 50 side by the breakage of the cover member 48. Will be issued.

  As described above, the additional chamber lower portion 42 communicates with the side chambers 28 and 30 (see FIG. 2). For this reason, the gas supplied from the side chambers 28 and 30 to the additional chamber lower part 42 by the ejection from the inflator 24 is supplied to the additional chamber upper part 40 via the communication parts 44 and 46 (see FIG. 6). .

  In other words, in the additional chamber 36, the additional chamber lower portion 42 is expanded and deployed before the additional chamber upper portion 40. The additional chamber upper portion 40 and the additional chamber lower portion 42 are disposed so as to be opposed to each other in the vertical direction so that reaction forces are obtained when they are deployed.

  As shown in FIG. 1, the additional chamber lower part 42 is expanded toward the lower side of the vehicle seat 12 when deployed, and is arranged on the rear side and the lower side of the vehicle seat 12. At this time, the additional chamber lower part 42 is set so as to contact the floor part 54. And it abuts against a pair of left and right rear brackets 25 disposed on the rear side of the seat frame 20 so that the forward movement is restricted.

  The additional chamber lower portion 42 may be in contact with the accommodating portion 27 so as to be restricted from moving forward. In any case, the additional chamber lower part 42 is brought into contact with the floor portion 54 in a state where it is inflated and deployed, so that the movement toward the front side is restricted, and a reaction force can be obtained against the external force toward the front side. ing.

  On the other hand, the additional chamber upper portion 40 is expanded toward the upper side of the vehicle seat 12 on the front seat side when deployed, and the rear surface 16A of the seat back 16 of the vehicle seat 12 and the vehicle seat on the rear seat side are expanded. It is set to be disposed between the lower leg L2 of the rear seat occupant P2 (hereinafter simply referred to as “rear seat occupant P2”) seated on the seat 51.

  In the present embodiment, as shown in FIG. 6, the additional chamber upper portion 40 and the additional chamber lower portion 42 are formed in a substantially cylindrical shape with a line along the sheet width direction as an axis in an expanded state. Yes. In addition, the communication portions 44 and 46 are in a substantially cylindrical shape with a line along the vertical direction as an axis in an inflated and deployed state.

(Operation and effect of passenger protection device)
Next, operations and effects of the occupant protection device according to the present embodiment will be described.

  As shown in FIG. 2, in the present embodiment, in the vehicle seat 12 on the front seat side to which the occupant protection device 10 is applied, the cushion airbag 22 is a main chamber provided in the front portion 14 </ b> A of the seat cushion 14. 26 and side chambers 28 and 30 provided along the seat longitudinal direction at both ends of the seat cushion 14 in the seat width direction. Further, in this embodiment, the cushion airbag 22 is provided with an additional chamber 36 on the rear side and the lower side of the seat cushion 14, and the additional chamber 36 communicates with the side chambers 28 and 30. .

  In the present embodiment, when the inflator 24 shown in FIG. 1 is operated, the gas ejected from the inflator 24 is supplied to the main chamber 26 and the side chambers 28 and 30 (see FIG. 2) of the cushion airbag 22, respectively. When the gas ejected from the inflator 24 is supplied to the main chamber 26 and the side chambers 28, 30, the main chamber 26 and the side chambers 28, 30 expand, and the upper side due to the reaction force by the seat frame 20 and an S spring (not shown). It is supposed to be raised toward.

  When the main chamber 26 of the cushion airbag 22 rises upward, the front part 14A of the seat cushion 14 rises upward, and the thigh T1 of the front seat occupant P1 is lifted. This suppresses the occurrence of a so-called submarine phenomenon in which the front-seat occupant P1 takes a posture to sink into the front of the seat during a frontal collision of the vehicle.

  Further, when the side chambers 28 and 30 (see FIG. 2) of the cushion airbag 22 are raised upward, both ends in the seat width direction of the seat cushion 14 are raised upward, and the front seat side occupant P1. The thigh T1 and the waist W1 are pressed and restrained from the outside in the seat width direction, and the movement of the front seat occupant P1 in the seat width direction is suppressed.

  When the gas ejected from the inflator 24 is supplied to the additional chamber lower portion 42 via the side chambers 28 and 30, the additional chamber lower portion 42 is expanded and deployed. Specifically, the additional chamber lower portion 42 bulges toward the lower side of the vehicle seat 12 on the front seat side and abuts against the floor portion 54. The additional chamber lower portion 42 is disposed between the lower portion of the seat back 16 of the vehicle seat 12 on the back surface 16 side and the floor portion 54, and the rear bracket disposed on the rear portion side of the seat frame 20. 25, the forward movement is restricted.

  Furthermore, when the gas ejected from the inflator 24 is supplied to the additional chamber upper portion 40 via the communication portions 44 and 46, the additional chamber upper portion 40 is expanded and deployed. Specifically, the additional chamber upper portion 40 is bulged toward the rear side and the upper side of the vehicle seat 12 on the front seat side, and the rear surface 16A of the seat back 16 of the vehicle seat 12 and the rear seat side occupant P2 It arrange | positions between lower leg L2.

  Thus, in the present embodiment, the additional chamber lower part 42 is inflated toward the lower side of the vehicle seat 12 when inflated and deployed, and the downward movement is restricted by contacting the floor portion 54. The On the other hand, when the additional chamber upper part 40 is inflated and deployed, the additional chamber lower part 42 bulges toward the rear side and the upper side of the vehicle seat 12, so that the additional chamber lower part 42 has a shorter deployment stroke than the additional chamber upper part 40. .

  As described above, the additional chamber upper portion 40 and the additional chamber lower portion 42 are disposed so as to face each other in the vertical direction, so that a reaction force is obtained when they are deployed. That is, the additional chamber lower part 42 is expanded and deployed before the additional chamber upper part 40, and the additional chamber lower part 42 is restrained from rising upward due to the reaction force from the additional chamber upper part 40. In this state, the additional chamber upper part 40 is reliably expanded and expanded upward in response to the reaction force from the additional chamber lower part 42.

  Here, at the time of a frontal collision of the vehicle, the leg F2 of the rear seat occupant P2 is swung up forward and upward around the waist belt SA that is a part of the seat belt S due to inertia. As described above, when the additional chamber lower portion 42 is inflated and deployed so as to close the gap between the lower portion on the back surface 16 side of the seat back 16 of the vehicle seat 12 on the front seat side and the floor portion 54, the front surface of the vehicle At the time of the collision, the leg portion F2 of the rear seat occupant P2 hits the additional chamber lower portion 42. As a result, at the time of a frontal collision of the vehicle, the rear seat occupant P2 is restricted from moving at least forward of the leg portion F2, and the leg portion F2 of the rear seat occupant P2 is moved to the vehicle seat 12 on the front seat side. It is possible to prevent or suppress the collision with the seat frame 20 or the like.

  Further, when the gas ejected from the inflator 24 is supplied to the additional chamber upper portion 40, the additional chamber upper portion 40 is expanded and deployed. Specifically, the additional chamber upper portion 40 is bulged toward the rear side and the upper side of the vehicle seat 12 on the front seat side, and the rear surface 16A of the seat back 16 of the vehicle seat 12 and the rear seat side occupant P2 It arrange | positions between lower leg L2. Thus, during a frontal collision of the vehicle, the knee portion K2 of the rear seat occupant P2 hits the additional chamber upper portion 40, and the knee portion K2 of the rear seat occupant P2 is in contact with the seat back 16 of the vehicle seat 12 on the front seat side. The collision can be prevented or suppressed.

  That is, according to the present embodiment, the lower leg L2 of the rear seat occupant P2 can be protected. Further, by restricting the movement of the leg F2 of the rear seat occupant P2 to the front side by the additional chamber lower portion 42, the inertia acting on the rear seat occupant P2 is reduced together with the protection of the leg F2, and the waist W2. Can be prevented from moving forward.

  Further, in the present embodiment, the airbag module 10 including the cushion airbag 22 stored inside the seat cushion 14 of the vehicle seat 12 on the front seat side is connected to the lower leg L2 (in the present embodiment, the rear seat side occupant P2). Further, it can also be used as an airbag module for a rear seat that protects the knee K2 and the leg F2).

  As a result, the inflator is not necessary in the airbag module for the rear seat, and the space for mounting the airbag module for the rear seat can be reduced accordingly. In the present embodiment, the additional chamber 36 for the rear seat is disposed at the rear and lower side of the vehicle seat 12 on the front seat side, so that the space below the vehicle seat 12 on the front seat side is narrow. In addition, it is possible to secure a space for mounting an airbag module for protecting the leg portion F2 of the rear seat side occupant P2 in the event of a vehicle collision.

  Further, since the additional chamber 36 as an air bag module for the rear seat is disposed at the rear and lower side of the vehicle seat 12 on the front seat side, the front seat occupant P1 does not feel uncomfortable when seated. Furthermore, since the inflator is not used in the airbag module for the rear seat, the weight and the cost can be reduced accordingly.

  By the way, in this embodiment, as shown in FIG. 2, the cushion airbag 22 includes a main chamber 26, side chambers 28, 30 and an additional chamber 36. Is not provided with a chamber.

  That is, a chamber is not provided in a portion corresponding to the lower side of the waist portion W1 of the front seat occupant P1. For this reason, compared with the case where the said chamber is provided, it becomes smaller than the quantity of the gas supplied to the main chamber 26 and the side chambers 28 and 30. In other words, it can be said that the additional chamber 36 can be provided in the cushion airbag 22 because the chamber is not provided in the rear portion and the central portion of the seat.

  In the present embodiment, as shown in FIG. 1, an accommodation portion 27 for accommodating a blower that sends air to the seat cushion 14 is attached to the lower portion of the seat frame 20, but the additional chamber 36 is Since it is disposed at the rear and lower side of the vehicle seat 12 on the front seat side, it is disposed at a position where it does not interfere with the housing portion 27. That is, according to this embodiment, even if the space below the vehicle seat 12 on the front seat side is narrow, a space for mounting the additional chamber 36 as an airbag module for the rear seat can be secured.

  In the present embodiment, the cushion airbag 22 is sewn to partition the interior of the cushion airbag 22. For this reason, the gas supply route shown in FIG. 2 is not limited to this, and the position of the sewing portion and the cushion airbag according to the gas supply amount of the main chamber 26, the gas supply speed of the side chambers 28 and 30, and the like. The shape of 22 can be changed as appropriate. Further, in the present embodiment, the inflator 24 is disposed at the central portion on the front end side of the seat cushion 14, but is not limited thereto. For example, the seat cushion 14 may be disposed at the center of the rear end side.

(Modification of this embodiment)
Below, the modification of said embodiment is demonstrated. In the following description, the same reference numerals are used for substantially the same configurations as those in the above embodiment, and the description is omitted.

(1) In the above embodiment, as shown in FIG. 4, in the additional chamber 36, the additional chamber upper portion 40 and the additional chamber lower portion 42 are Z-folded, but this is not restrictive. For example, as shown in FIG. 7A, the additional chamber upper portion 53 and the additional chamber lower portion 55 may be accommodated (so-called roll folded) in a state of being wound in a roll shape.

  Further, in the present embodiment, as shown in FIG. 7A, a rear end portion 14B of the seat cushion 14 is formed on the upper portion of the shaft 38 disposed along the seat width direction in the rear portion of the seat frame 20. Has been placed.

  That is, in the present embodiment, the rear end portion 14B of the seat cushion 14 is shallowly wound around the shaft 38, and the rear end portion 14B of the seat cushion 14 is not caught in the rear portion of the shaft 38. Therefore, in the present embodiment, the additional chamber 36 is placed on the rear side and the lower side of the seat cushion 14 with the side chambers 28 and 30 wound between the rear end portion 14B of the seat cushion 14 and the upper portion of the shaft 38. Can be arranged.

(2) On the other hand, for example, as shown in FIG. 7B, when the rear end portion 56 </ b> A of the seat cushion 56 is deep with respect to the shaft 38, the seat extends to the lower side of the shaft 38. The rear end portion 14B of the cushion 14 is rolled up. Here, the additional chamber upper 53 side is not shown.

  For this reason, in the present embodiment, the through portion 58 is formed in the rear end portion 56 </ b> A of the seat cushion 56, and the additional chamber 36 is disposed on the rear side and the lower side of the seat cushion 56 through the through portion 58. In this case, in the cushion airbag 60 shown in FIG. 7B, a connection chamber 62 connecting the side chamber 28 and the side chamber 30 is provided on the rear end portion 56A side of the seat cushion 56, and the connection chamber 62 and the lower portion of the additional chamber are provided. A connecting chamber 64 that connects 42 and passes through the penetration 58 is provided.

(3) Further, as shown in FIG. 7C, the side chambers 28 and 30 of the cushion airbag 22 are wound around the lower side of the shaft 38 and the lower side of the rear end portion 66A of the seat cushion 66. May be. In this case, however, the side chambers 28 and 30 of the cushion airbag 22 need to be bonded to the lower portion of the rear end portion 66A of the seat cushion 66. Although not shown, the additional chamber lower portion 55 may be disposed on the rear end portion 66A side of the seat cushion 66 through the side chambers 28 and 30 through the gap between the S spring and the S spring.

(4) In the embodiment shown in FIG. 6, the additional chamber upper portion 40 and the additional chamber lower portion 42 can be arranged over substantially the entire region in the sheet width direction. Between the two end portions 42 in the sheet width direction, communication portions 44 and 46 that connect the additional chamber upper portion 40 and the additional chamber lower portion 42 are provided.

  In the present embodiment, at the time of a frontal collision of the vehicle, an additional chamber upper portion 40 that contacts the knee portion K2 of the rear seat side occupant P2 and at least an additional chamber lower portion 42 that contacts the leg portion F2 of the rear seat occupant P2 are provided. If you can. For this reason, the shape of the additional chamber 36 is not limited to this. For example, the additional chamber 36 shown in FIG. 6 includes an additional chamber upper portion 40, an additional chamber lower portion 42, and communication portions 44, 46. However, the additional chamber upper portion 40 and the communication portions 44, 46 are not necessarily required. is not.

  Specifically, as illustrated in FIGS. 8 to 11, the additional chamber 68 may be configured only on the side of the additional chamber lower portion 42 as illustrated in FIGS. 8 to 11. In this case, at the time of a frontal collision of the vehicle, the leg portion F2 of the rear seat side occupant P2 hits the additional chamber lower portion 42, so that the movement of the leg portion F2 of the rear seat side occupant P2 to the front side is restricted. It is possible to prevent or suppress the collision of the leg portion F2 of the side occupant P2 with the seat frame 20 of the vehicle seat 12 on the front seat side.

  In this additional chamber 68, since the additional chamber upper portion 40 (see FIG. 6) is not provided, the additional chamber lower portion 42 interferes with, for example, the rear end portion 14B of the seat cushion 14 when inflated and deployed. Lifting is suppressed.

(5) Furthermore, in the embodiment shown in FIG. 6, when the additional chamber upper part 40 is inflated and deployed, it forms a substantially cylindrical shape with the line along the seat width direction as the axis, and the seat of the vehicle seat 12 Although it is arranged between the back 16A of the back 16 and the lower leg L2 of the rear seat side occupant P2, it is not limited to this.

  For example, as shown in FIGS. 12 and 13, when the shape of the additional chamber upper portion 70 is changed and the additional chamber upper portion 70 is inflated and deployed, the back surface 16A of the seat back 16 of the vehicle seat 12 and the rear seat side occupant It may be arranged between the lower leg L2 and the upper body U2 of P2. In this case, the additional chamber upper part 70 includes an upper chamber 70A that constitutes the upper part, a central chamber 70B that constitutes the central part, and a lower chamber 70C that constitutes the lower part.

  The upper chamber 70A is sized to bulge rearward from the central chamber 70B and the lower chamber 70C, and is located between the back surface 16A of the seat back 16 of the vehicle seat 12 and the upper body U2 of the rear seat occupant P2. Is set to be placed in The lower chamber 70C is set so as to be disposed between the back surface 16A of the seat back 16 of the vehicle seat 12 and the lower leg L2 of the rear seat side occupant P2.

  In the present embodiment, the knee K2 of the rear seat occupant P2 hits the lower chamber 70C of the additional chamber upper portion 70 during a frontal collision of the vehicle, and therefore the knee K2 of the rear seat occupant P2 is the front seat side vehicle seat. It is possible to prevent or suppress the collision with the twelve seat backs 16.

  Furthermore, in the present embodiment, the head (not shown) of the rear seat occupant P2 hits the upper chamber 70A of the additional chamber upper portion 70 at the time of a frontal collision of the vehicle. The collision with the seat back 16 of the vehicle seat 12 can be prevented or suppressed.

(6) When the additional chamber upper portion 70 is enlarged as in this embodiment, the additional chamber upper portion 70 is disposed inside the seat back 16 as shown in FIG. Also good. In the present embodiment, when the additional chamber upper part 70 is inflated and deployed, the additional chamber upper part 70 is disposed between the back surface 16A of the seat back 16 of the vehicle seat 12 and the lower leg L2 and the upper body U2 of the rear seat side occupant P2. I am doing so. For this reason, a capacity | capacitance becomes large compared with the additional chamber upper part 40 shown in FIG. Therefore, in this embodiment, although not shown, the inflator may be enlarged or a plurality of inflators may be provided.

  As described above, an example of the embodiment of the present invention has been described. However, the embodiment of the present invention is not limited to the above, and one embodiment and various modifications may be used in combination as appropriate. Needless to say, the present invention can be implemented in various forms without departing from the gist of the invention.

10 Airbag module (occupant protection device)
12 Vehicle seat (front seat)
14 Seat Cushion 16 Seat Back 16A Rear 22 Cushion Airbag 24 Inflator 26 Main Chamber (Cushion Airbag)
28 Side chamber (cushion airbag)
30 Side chamber (cushion airbag)
36 Additional chamber (cushion airbag)
40 Additional chamber top (additional chamber, cushion airbag)
42 Additional chamber lower part (additional chamber, cushion airbag)
44 Communication part (additional chamber, cushion airbag)
46 Communication part (additional chamber, cushion airbag)
53 Additional chamber top (additional chamber, cushion airbag)
54 Floor 55 Additional chamber lower part (additional chamber, cushion airbag)
56 Seat cushion 60 Cushion airbag 62 Connection chamber (cushion airbag)
64 Connection chamber (cushion airbag)
66 Seat cushion 68 Additional chamber (cushion airbag)
70 Additional chamber top (additional chamber, cushion airbag)
70A Upper chamber (additional chamber, cushion airbag)
70B Central chamber (additional chamber, cushion airbag)
70C Lower chamber (additional chamber, cushion airbag)

Claims (1)

An inflator stored inside the seat cushion of the front seat of the vehicle;
A cushion airbag stored inside the seat cushion and inflated by the operation of the inflator at the time of a vehicle collision;
Provided in the cushion airbag, communicated with the interior of the cushion airbag, inflated and deployed by the operation of the inflator, and disposed at least between the lower portion on the back side of the seat back of the front seat and the floor portion. An additional chamber,
An occupant protection device.