JP2019137109A - Rear seat airbag device - Google Patents

Abstract

To provide a rear seat airbag device which enables an airbag to be formed compactly and deploys the airbag early in a vehicle collision to secure occupants' safety even if body types of occupants differ.SOLUTION: An airbag 31 of a rear seat airbag device includes: a curved deployment part 41 which deploys in a curve form from a seat back 12 of a front seat 10 to the vehicle body rear side in an inflation and deployment state; and a linear deployment part 42 which linearly deploys from the curve deployment part 41 to the vehicle body front side at the vehicle body lower side of the curved deployment part 41. In the linear deployment part 42, the vehicle body front side of the linear deployment part 42 is disposed spaced away from the vehicle body front side of the curved deployment part 41 to the vehicle lower side so as to cover the vehicle body front side and the vehicle body upper side of knee parts of an occupant.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rear seat airbag device including an airbag that is disposed in a seat back of a front seat and inflates and deploys to the rear side of a vehicle body in the event of a vehicle collision.

  In vehicles such as automobiles, a collision detection device such as an acceleration sensor that detects a collision from the front of the vehicle is provided at the front of the vehicle body. When a collision from the front of the vehicle is detected by the collision detection device, the airbag device is activated to It is common practice to protect passengers.

  For vehicles with front seats and rear seats, in addition to the front seat airbag device that protects passengers seated in the driver's seat and front passenger seat, which are front seats, 2. Description of the Related Art A rear seat airbag device that protects an occupant seated in a seat is known.

  For example, Patent Document 1 discloses a gas in which an inflator and a folded airbag are disposed on the back of a headrest or a seat back of a front seat, and the airbag is inflated by the inflator according to the state of the front seat when a vehicle collides. A rear seat airbag device is disclosed in which an air bag is inflated and deployed on the rear side of a vehicle body by changing a pressure distribution to protect an occupant seated on a rear seat.

Japanese Patent Laid-Open No. 5-16759

  In the rear seat airbag device in which the airbag is folded in the seat back of the front seat, if the thickness of the seat back of the front seat is increased by the airbag, the comfort of the passenger seated on the rear seat is impaired. Therefore, it is desirable to configure the airbag in a compact manner.

  The rear seat airbag device also allows the rear seat to be deployed early in the event of a vehicle collision, even when the front seat is slid to the front of the vehicle and the distance between the front seat and the rear seat increases. It is necessary to protect the occupant seated on the seat and ensure the safety of the occupant.

  The backseat seats are not only occupants with standard physique but also large and small sized occupants, so even if the occupant seated in the backseat is different in size, it can be seated on the backseat. It is necessary to protect the occupant and ensure the safety of the occupant.

  Accordingly, the present invention provides a rear seat airbag device including an airbag that protects an occupant seated in a rear seat, and the airbag is compactly configured and deployed early in the event of a vehicle collision, and the occupant has a different physique. It is an object of the present invention to provide a rear seat airbag device that can ensure the safety of passengers even in the case.

  In order to solve the above problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application is mounted on a vehicle having a front seat and a rear seat, and is disposed in a seat back of the front seat and is inflated and deployed on the rear side of the vehicle body at the time of a vehicle collision. A rear seat airbag device comprising an airbag for protecting an occupant seated on the rear seat, wherein the airbag is deployed in a curved shape from the seat back to the vehicle rear side in an inflated and deployed state. A curved unfolding portion that protects the chest of the occupant and a linear unfolding portion that unfolds linearly from the curved unfolding portion to the front of the vehicle body on the vehicle body lower side of the curved unfolding portion to protect the occupant's knee. The straight deployment portion is disposed such that the front side of the linear deployment portion is spaced from the front side of the curved deployment portion to the lower side of the vehicle body so as to cover the front side and the upper side of the vehicle body of the knee portion of the occupant. Features.

  According to a second aspect of the present invention, in the first aspect of the present invention, the airbag includes a tether that connects a vehicle body front side of the curved deployment portion and a vehicle body front side of the linear deployment portion. It is characterized by being.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the linear development portion is formed on the occupant's knee from the rear side of the occupant's knee and from the upper side of the occupant. It is characterized in that it extends in a linearly inclined manner toward the front side of the vehicle body and the lower side of the vehicle body.

  According to the invention described in claim 1 of the present application, the rear seat airbag device includes an airbag disposed in the seat back of the front seat and protecting an occupant seated on the rear seat. A curved unfolding portion that unfolds in a curved shape from the seat back to the rear side of the vehicle body, and a linear unfolding portion that unfolds linearly from the curved unfolding portion to the front side of the vehicle body on the vehicle lower side of the curved unfolding portion.

  As a result, a hollow portion is formed between the curved deployment portion and the straight deployment portion to form the airbag in a compact manner, and at the time of a vehicle collision, the airbag is quickly deployed, so that the passenger can The chest and knees can be protected to ensure the safety of the occupant. Even when the separation distance between the front seat and the rear seat is changed, the airbag can be deployed early in the event of a vehicle collision to ensure the safety of the passenger.

  In addition, the straight deployment part is arranged so that the vehicle front side of the linear deployment part is spaced apart from the vehicle front side of the curved deployment part to the vehicle body lower side so as to cover the vehicle front side and the vehicle body upper side of the occupant's knee. By arranging the front side of the vehicle body so that it can move in the vertical direction, even when the occupant's physique is different, the linear deployment part can be moved in the vertical direction at the time of a vehicle collision, and can be brought into substantially equal contact with the occupant's knee, Crew safety can be ensured.

  Therefore, in the rear seat airbag device provided with the airbag for protecting the occupant seated on the rear seat, the occupant is configured even when the airbag is compactly configured and deployed at the time of a vehicle collision and the occupant has a different physique. Can be secured.

  According to the invention described in claim 2, the airbag includes a tether that connects the vehicle body front side of the curved deployment portion and the vehicle body front side of the linear deployment portion, so that the vehicle body front side of the linear deployment portion is vertically moved. Since the occupants can be arranged so as to be movable away from each other, even when the occupants have different physiques, the straight line deployment portion can be brought into substantially equal contact with the occupant's knee at the time of a vehicle collision, thereby ensuring the safety of the occupant. .

  According to the invention of claim 3, the linear development portion extends in a linearly inclined manner from the rear side of the occupant's knee and the upper side of the occupant to the front side of the occupant's knee and the lower side of the vehicle. By using the airbag having a linear deployment portion that extends in a linearly inclined manner from the rear side of the occupant's knee and the upper side of the vehicle body to the front side of the occupant's knee and the lower side of the vehicle body in the inflated and deployed state. Can be effectively obtained.

1 is a side view of a vehicle on which a rear seat airbag device according to an embodiment of the present invention is mounted. It is a perspective view which shows a front seat. It is a perspective view which shows the expansion | deployment deployment state of the airbag arrange | positioned in the front seat. It is a side view which shows the expansion | deployment deployment state of the airbag arrange | positioned in the front seat. It is a rear view which shows the expansion | deployment deployment state of the airbag arrange | positioned in the front seat. It is sectional drawing of the airbag along the Y6-Y6 line in FIG. It is sectional drawing of the airbag along the Y7-Y7 line | wire in FIG. It is sectional drawing of the airbag along the Y8-Y8 line | wire in FIG. It is explanatory drawing for demonstrating the expansion | deployment deployment state of an airbag.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side view of a vehicle equipped with a rear seat airbag device according to an embodiment of the present invention. As shown in FIG. 1, a vehicle 1 equipped with a rear seat airbag device according to an embodiment of the present invention includes a front seat 10 that is a driver seat or a passenger seat, and a front seat 10 in a passenger compartment 2. And a rear seat 20 disposed on the rear side of the vehicle body. Each of the front seat 10 and the rear seat 20 is attached to the floor panel 3 so as to be movable in the longitudinal direction of the vehicle body.

  The vehicle 1 includes a front seat airbag device (not shown) that protects a passenger seated in a driver seat or a passenger seat, which is the front seat seat 10, and a rear seat airbag that protects a passenger seated in the rear seat seat 20. A device 30 is mounted. The rear seat airbag device 30 is disposed in the front seat 10 which is a driver seat or a passenger seat.

  FIG. 2 is a perspective view showing the front seat. As shown in FIG. 2, a front seat 10 that is a driver seat or a passenger seat is connected to a seat cushion 11, a seat back 12 connected to a rear end portion of the seat cushion 11, and an upper end portion of the seat back 12. And a headrest 13.

  The front seat 10 is configured to be movable in the longitudinal direction of the vehicle body as indicated by an arrow A1 by a longitudinal adjustment mechanism 14 that adjusts the longitudinal position of the seat cushion 11. The front seat 10 is also configured such that the inclination angle of the seat back 12 can be changed by an angle adjustment mechanism 15 that adjusts the inclination angle of the seat back 12 as indicated by an arrow A2.

  The rear seat airbag device 30 is disposed in the seat back 12 and includes an airbag 31, a case 32 that accommodates and holds the folded airbag 31 disposed on the upper side of the seat back 12, and upper and lower sides of the seat back 12. An inflator 33 (gas generator) that is disposed at the center in the direction and operates when a vehicle collides to supply gas into the airbag 31 to inflate and deploy the airbag 31 is provided.

  Although not shown, the rear seat airbag device 30 is also fixed to a seat back frame disposed in the seat back 12 and attached to the front side of the vehicle body of the case 32 so that the airbag 31 is inflated when the airbag 31 is inflated and deployed. A reaction force plate for applying a reaction force to 31 is provided.

  The inflator 33 is attached to a seat back frame provided on both sides of the seat back 12 in the vehicle width direction and disposed in the seat back 12. The inflator 33 is connected to an airbag 31 accommodated and held in the case 32 via a gas supply pipe 34.

  A gas supply port 35 through which gas is supplied from the inflator 33 through the gas supply pipe 34 is formed in the airbag 31, and as shown in FIG. 6 described later, two gases are supplied from the left and right inflators 33, respectively. Supply ports 35 are formed side by side in the vehicle width direction.

  The seat back 12 is also provided at a portion of the case 32 disposed in the seat back 12 on the rear side of the vehicle body of the airbag 31 when the airbag 31 is inflated and deployed. (Shown) is formed. For example, the breaking portion is formed thinner than the other portion of the seat back 12 on the rear side of the vehicle body, and is broken by the inflation pressure of the airbag 31.

  The rear seat airbag device 30 operates when the inflator 33 is actuated to supply gas into the airbag 31 when the vehicle collides, and when the airbag 31 is inflated and deployed by the gas from the inflator 33, the rupture portion is broken and the seat is broken. Inflated and deployed from the back 12 to the rear side of the vehicle body, the occupant seated on the rear seat 20 is prevented from colliding with the front seat 10 to protect the occupant.

  3, 4, and 5 are a perspective view, a side view, and a rear view, respectively, showing the inflated and deployed state of the airbag disposed in the front seat. 6 is a cross-sectional view of the airbag along line Y6-Y6 in FIG. 4, FIG. 7 is a cross-sectional view of the airbag along line Y7-Y7 in FIG. 5, and FIG. 8 is Y8-Y8 in FIG. It is sectional drawing of the airbag along a line.

  As shown in FIGS. 3 to 8, the airbag 31 has a curved deployment part 41 that projects in a substantially semicircular arc shape from the upper part of the seat back 12 toward the rear side of the vehicle body in a deployed state in an inflated and deployed state. And a linear development part 42 that linearly develops from the curved development part 41 to the lower side of the vehicle body and the front side of the vehicle body up to the center part in the vertical direction of the seat back 12.

  As shown in FIG. 9 to be described later, the curved unfolding portion 41 is deployed on the front side of the vehicle body of the chest P1 of the occupant P so that the rear side of the vehicle body faces the chest P1 of the occupant P seated on the rear seat 20. Protect P1. The straight deployment part 42 is deployed on the vehicle body front side and vehicle body upper side of the knee part P2 of the occupant P so as to oppose the knee part P2 of the occupant P seated on the rear seat 20 on the lower side of the vehicle body, thereby protecting the knee part P2 of the occupant P. To do.

  The straight development part 42 extends linearly from the curved development part 41 to the front side of the vehicle body of the knee part P2 of the occupant P so as to cover the front side and the upper side of the vehicle body of the knee part P2 of the occupant P. The vehicle extends from the rear side and the vehicle body upper side to the vehicle body front side and the vehicle body lower side of the knee portion P2 of the occupant P in a straight line.

  The vehicle body front side of the curved deployment portion 41 and the vehicle body front side of the linear deployment portion 42 are connected by a tether 36. The straight deployment portion 42 is disposed by the tether 36 such that the vehicle front side of the linear deployment portion 42 is spaced from the vehicle front side of the curved deployment portion 41 to the vehicle body lower side, and is linearly deployed according to the physique of the occupant seated on the rear seat 20. The vehicle body front side of the part 42 is arranged to be movable in the vertical direction.

  The tether 36 is pulled when the occupant having a small physique sits on the rear seat 20, and the straight development portion 42 comes into contact with the knee P <b> 2 of the occupant P so that the standard physique is applied to the rear seat 20. When the occupant is seated, the straight development part 42 comes into contact with the knee part P2 of the occupant P in a slightly slack state, and when the occupant P having a large physique sits on the rear seat 20, the straight line is greatly slackened. The deployment part 42 is set so as to contact the knee part P2 of the occupant P.

  Specifically, the airbag 31 includes a first bag portion 51, a second bag portion 52, a third bag portion 53, and a fourth bag portion 54 that are formed in a substantially hollow cylindrical shape in the inflated and deployed state. ing. The 1st bag part 51, the 2nd bag part 52, the 3rd bag part 53, and the 4th bag part 54 are arrange | positioned along with the vehicle width direction from the vehicle body left side to the vehicle body right side.

  The first bag portion 51, the second bag portion 52, the third bag portion 53, and the fourth bag portion 54 are curved and unfolded so as to project in a substantially semicircular arc shape from the upper part of the seat back 12 to the rear side of the vehicle body. The vertical direction center of the seat back 12 from the curved unfolding portions 51a, 52a, 53a, 54a to the vehicle body lower side and the vehicle body front side at the vehicle body lower side of the portions 51a, 52a, 53a, 54a and the curved unfolding portions 51a, 52a, 53a, 54a Straight development portions 51b, 52b, 53b, and 54b that linearly develop up to the portion.

  The curved deployment portion 41 of the airbag 31 is configured by the curved deployment portions 51a, 52a, 53a, and 54a of the first, second, third, and fourth bag portions 51, 52, 53, and 54. The unfolding part 42 is constituted by straight unfolding parts 51b, 52b, 53b, 54b of the first, second, third, and fourth bag parts 51, 52, 53, 54.

  The airbag 31 is formed by stitching a plurality of sheets made of synthetic resin, and includes a first sheet 61 constituting the first bag portion 51, a second sheet 62 constituting the second bag portion 52, and a third bag portion. The third sheet 63 forming 53 and the fourth sheet 64 forming the fourth bag portion 54 are sewn together.

  The first, second, third, and fourth sheets 61, 62, 63, and 64 are respectively sewn to adjacent sheets via a synthetic resin partition sheet 65. As shown in FIGS. 6 and 7, each of the partition sheets 65 has a plurality of communication so as to communicate the spaces in the adjacent first, second, third, and fourth bag portions 51, 52, 53, and 54. A hole 37 is formed.

  As shown in FIG. 6, a gas supply port 35 is formed in the airbag 31 on the vehicle body front side of the second and third bag portions 52 and 53 disposed on the center side in the vehicle width direction. In the airbag 31, the gas from the inflator 33 is supplied to the second and third bag portions 52 and 53 through the gas supply port 35, and to the first and fourth bag portions 51 and 54 through the communication hole 37 of the partition sheet 65. The first, second, third, and fourth bag portions 51, 52, 53, and 54 are inflated and deployed, respectively.

  The airbag 31 is also formed with a vent hole 38 for discharging gas in the airbag 31 when a load is applied to the airbag 31 from the occupant P seated on the rear seat 20 at the time of a vehicle collision. . The vent hole 38 is formed on the outer side in the vehicle width direction on the vehicle body front side of the first and fourth bag parts 51 and 54 arranged on the outer side in the vehicle width direction, and the airbag 31 is a gas in the airbag 31 from the vent hole 38. The energy of impact is absorbed by discharging to the outside.

  FIG. 9 is an explanatory diagram for explaining an inflated and deployed state of the airbag. In the rear seat airbag device 30, the inflator 33 is actuated during a vehicle collision to supply gas into the airbag 31, the airbag 31 breaks the rupture portion, and is inflated and deployed from the seat back 12 to the vehicle body rear side. As shown in FIG. 9, it expand | swells and expands so that it may have the curved expansion | deployment part 41 and the linear expansion | deployment part 42. FIG.

  The curved deploying portion 41 and the straight deploying portion 42 of the airbag 31 are provided at positions corresponding to the chest P1 and the knee P2 of the occupant P seated on the rear seat 20, and are moved to the front of the vehicle body in the event of a vehicle collision. The occupant P is protected by receiving the chest part P1 and the knee part P2 of P.

  When the occupant P has a small physique, the straight development portion 42 contacts the knee P2 of the occupant P while the tether 36 is pulled, and when the occupant P has a standard physique, the tether 36 is slightly slackened. When the occupant P is in contact with the knee P2 and has a large physique, the linear deploying portion 42 can be moved in the vertical direction even when the tether 36 is in a slack state and the occupant P is in contact with the knee P2 and the physique of the occupant is different. The occupant P is protected by receiving the knee portion P2 of the occupant P.

  The curved unfolding portion 41 moves in the vertical direction as the linear unfolding portion 42 moves in the vertical direction, and when the occupant P has a standard physique, the curved unfolding portion 41 is curved and unfolded as compared with a small physique. When the portion 41 moves to the upper side of the vehicle body and the occupant P has a large physique, the curved unfolding portion 41 moves to the upper side of the vehicle body and the physique of the occupant differs as compared with the case of having a standard physique. The curved unfolding portion 41 moves up and down to receive the chest P1 of the occupant P and protect the occupant P.

  In the present embodiment, the airbag 31 is formed to include the first, second, third, and fourth bag portions 51, 52, 53, and 54 in the inflated and deployed state, but includes four bag portions. It is not limited to a thing, It can also be provided with two bag parts or three bag parts.

  Thus, according to the rear seat airbag device 30 according to the present embodiment, the airbag 31 that is disposed in the seat back 12 of the front seat 10 and protects the passenger P seated on the rear seat 20 is: A curved unfolding portion 41 that unfolds from the seat back 12 to the rear side of the vehicle body and a linear unfolding portion 42 that unfolds linearly from the curved unfolding portion 41 to the front side of the vehicle body on the vehicle lower side of the curved unfolding portion 41 are provided.

  Thereby, the cavity 43 is formed between the curved deployment part 41 and the linear deployment part 42 to form the airbag 31 in a compact manner, and the airbag 31 is deployed early at the time of a vehicle collision so that the curved deployment part 41 and the straight line The deployment part 42 can protect the chest P1 and the knee P2 of the occupant P, respectively, and ensure the safety of the occupant P. Even when the separation distance between the front seat 10 and the rear seat 20 is changed, the airbag 31 can be deployed early in the event of a vehicle collision to ensure passenger safety.

  In addition, the straight deployment portion 42 is disposed such that the front side of the straight deployment portion 42 is spaced from the front side of the curved deployment portion 41 to the lower side of the vehicle body so as to cover the front side and the upper side of the vehicle body of the knee P2 of the occupant P. Accordingly, by arranging the front side of the vehicle body of the straight deployment part 42 so as to be movable in the vertical direction, even when the occupant P has a different physique, the linear development part 42 is moved in the vertical direction at the time of a vehicle collision so that the knee part of the occupant P It can be made to contact P2 substantially equally, and the safety | security of the passenger | crew P can be ensured.

  Therefore, in the rear seat airbag device 30 including the airbag 31 that protects the occupant P seated on the rear seat 20, the airbag 31 is configured to be compact and deployed at an early stage in the event of a vehicle collision, and the physique of the occupant P Even when they are different, the safety of the occupant P can be ensured.

  The airbag 31 has a tether 36 that connects the vehicle body front side of the curved deployment portion 41 and the vehicle body front side of the linear deployment portion 42. Accordingly, the vehicle body front side of the straight deployment portion 42 can be disposed so as to be movable in the vertical direction so that the straight deployment portion 42 can be placed at the knee portion P2 of the occupant P even when the occupant P has a different physique. And the safety of the occupant P can be ensured.

  Further, the straight deployment portion 42 extends in a linearly inclined manner from the rear side of the vehicle body of the knee portion P2 of the occupant P and the upper side of the vehicle body to the front side of the vehicle body of the knee portion P2 of the occupant P and the lower side of the vehicle body. Thus, in the inflated and deployed state, the air including the linear deployment portion 42 that extends in a linearly inclined manner from the rear side of the vehicle body of the knee portion P2 of the occupant P to the front side of the vehicle body of the knee portion P2 of the occupant P and the lower side of the vehicle body. Even when the occupant P has a different physique using the bag 31, safety of the occupant P can be ensured.

  In this embodiment, the rear seat airbag device 30 is mounted on the vehicle 1 having the front seat 10 and the rear seat 20, but the vehicle having the first row seat, the second row seat, and the third row seat. The rear seat airbag device 30 may be disposed on the first row seat to protect the passenger seated on the second row seat, and the rear seat airbag device 30 may be disposed on the second row seat. It is also possible to protect the occupant seated on the third row seat.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the rear seat airbag device according to the present invention, the airbag is configured in a compact manner, deployed early in the event of a vehicle collision, and ensures the safety of the passenger even when the passenger's physique is different. Therefore, it may be suitably used in the field of vehicle safety technology.

1 Vehicle 10 Front Seat 12 Seat Back 20 Rear Seat 30 Rear Seat Airbag Device 31 Airbag 36 Tether 41 Curved Deployment Part 42 Linear Deployment Part P Crew P1 Chest P2 Knee

Claims (3)

Mounted in a vehicle having a front seat and a rear seat, disposed in the seat back of the front seat, and inflated and deployed to the rear side of the vehicle body in the event of a vehicle collision, to protect a passenger seated on the rear seat A rear seat airbag device including an airbag,
In the inflated and deployed state, the airbag is deployed from the seat back to the rear side of the vehicle body in a curved shape to protect the chest of the occupant, and from the curved deployment unit on the vehicle body lower side of the curved deployment unit. A linear deployment part that linearly deploys on the front side of the vehicle body and protects the occupant's knee,
The linear deployment portion is disposed such that the vehicle body front side of the linear deployment portion is spaced from the vehicle body front side of the curved deployment portion to the vehicle body lower side so as to cover the vehicle body front side and the vehicle body upper side of the occupant's knee.
A rear seat airbag device characterized by the above. The airbag has a tether that connects a vehicle body front side of the curved deployment portion and a vehicle body front side of the linear deployment portion,
The rear seat airbag device according to claim 1. The straight line extending portion extends in a linearly inclined manner from the rear side of the occupant's knee and the upper side of the occupant to the front side and the lower side of the occupant's knee.
The rear seat airbag device according to claim 1 or 2, wherein the rear seat airbag device is provided.

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