JP2016222073A - Occupant protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an occupant protection device capable of quickly and reliably receiving a head of an occupant by an airbag when the head of the occupant seated on a seat moves left and right during a vehicle collision.SOLUTION: An airbag 15 of an occupant protection device MP at the completion of inflation comprises: a front panel part 17 provided around a head of an occupant in a substantially U shape when seen from above and capable of receiving the head of the occupant moving forward; a left panel part 21 capable of receiving the head of the occupant moving left; and a right panel part 23 capable of receiving the head of the occupant moving right. Each of the panel parts 21, 23 comprises a frame-like inflation part 34 which inflates continuously in a reverse U shape on an upper edge side of an outer peripheral edge and comprises a rear edge side inflation part 36, a front edge side inflation part 40, and a ceiling edge side inflation part 38. The left and right frame-like inflation parts 34 are provided with restriction members 91 for restricting the movement in a mutually separating direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an occupant protection device that inflates an airbag and receives and protects the head of an occupant seated on a seat including a driver, a passenger on the passenger seat, and the like by the inflated airbag at the time of a vehicle collision. .

  2. Description of the Related Art Conventionally, as an occupant protection device, an airbag is configured to be able to receive and protect an occupant's head seated on a vehicle seat in the event of a vehicle collision by inflating an inflation gas to complete the inflation. (For example, see Patent Document 1). In this occupant protection device, the inflated airbag is arranged around the occupant's head by arranging pipe-shaped inflatable portions in a lattice shape and in a cup shape with the opening facing diagonally forward and downward. Was configured to cover.

German Patent Application Publication No. 198595981

  However, in the conventional occupant protection device, since the airbag at the time of completion of inflation is in a cup shape with the opening directed diagonally forward and downward, it follows the lateral direction from the back side to the front side of the occupant head. Further, the width of the inner peripheral wall portion of the airbag is the widest shape at the position of the occupant head. Therefore, although the airbag at the completion of the inflation covers the periphery of the occupant head, there is a large space between the left and right side portions of the occupant head and the occupant head on the inner peripheral wall portion of the airbag. Due to the space, when the head of the occupant seated on the seat moves from side to side, the airbag is difficult to receive the occupant head quickly and accurately.

  The present invention solves the above-described problem, and when an occupant's head seated on a seat moves left and right at the time of a vehicle collision, the occupant's head can be quickly and accurately received by the airbag. An object is to provide an occupant protection device.

An occupant protection device according to the present invention is an occupant protection device configured such that, when a vehicle collides, an airbag inflated by inflating an inflating gas receives the head of an occupant seated on a vehicle seat,
The airbag at the completion of inflation
As seen from above, it is arranged in a substantially U shape around the passenger's head,
A front panel portion that covers the front of the front side of the head of the occupant seated on the seat and can receive the occupant head moving forward;
A left panel portion extending rearward from the left edge of the front panel portion, covering the left side surface of the occupant head, and capable of receiving the occupant head moving left;
A right panel portion extending rearward from the right edge of the front panel portion, covering the right side surface of the occupant head, and capable of receiving the occupant head moving to the right;
And configured with
The rear edge side inflating portion, the leading edge side inflating portion, and the leading edge side inflating portion so that the left panel portion and the right panel portion are inflated in an inverted U shape on the upper edge side of the outer peripheral edge of each of the left panel portion and the right panel portion, and Left and right frame-like inflating parts, each having a ceiling edge side inflating part that connects upper ends of the trailing edge side inflating part and the leading edge side inflating part,
It is characterized in that a restricting member for restricting the movement of the left and right frame-shaped inflating portions in the direction of separation from each other is disposed.

  In the occupant protection device according to the present invention, when the airbag flows in the inflation gas to complete the inflation, the left panel portion and the right panel portion exhibit shape retention by the frame-like inflation portion, It is arranged on the left and right of the passenger head. And the movement in the direction which leaves | separates right and left outward is controlled by the control member between the frame-shaped expansion parts of a left panel part and a right panel part. Therefore, for example, even if the occupant's head moves to the left and the left panel receives the occupant's head, the left panel is difficult to move away from the right panel, and the reaction force is secured quickly. It is possible to catch the moving occupant head. Further, the left panel portion and the right panel portion are arranged so as to extend rearward from the left and right edges of the front panel portion, and on the left and right sides of the occupant head, without increasing the width dimension in the left and right direction, Since it is in a state of being arranged along the front-rear direction so as to be substantially left-right symmetric, even if the occupant's head moves along the left-right direction, it is closer to the front and rear edge sides of the left and right panel parts Immediately beside the occupant head, the occupant head can be received and protected immediately.

  Therefore, in the occupant protection device according to the present invention, when the head of the occupant seated on the seat moves left and right in the event of a vehicle collision, the occupant head is quickly and accurately received by the airbag that has been inflated. Can do.

  The above-mentioned occupant's head refers to the entire region above the occupant's neck, and includes not only the narrowly-defined head region but also parts such as the face, chin, and ears.

  In the occupant protection device according to the present invention, the right and left ceilings are arranged so that the regulating members of the airbag are located in the vicinity of the center in the front-rear direction of the ceiling edge side inflating portions of the left and right frame-like inflating portions when inflation is completed. It is desirable that they are arranged so as to approach each other compared to the front ends of the edge-side expansion portions.

  In such a configuration, the left and right frame-like inflating portions have the distance between the center in the front-rear direction of the ceiling edge side inflating portion narrower than the distance between the front ends of the ceiling edge side inflating portion. The airbag completes inflating with the right panel portion and the right panel portion being closer to each other near the center in the front-rear direction on the upper edge side than on the front edge side. Therefore, on the left and right sides of the occupant head, the central part on the upper edge side of the left panel part and the right panel part is closer to the occupant head together with the part of the left panel part and the right panel part right next to the occupant head. Thus, the occupant's head is wrapped right and left so as to approximate a helmet. As a result, with such a configuration, the airbag when inflated can receive and protect the occupant head more quickly when the occupant head moves in the left-right direction.

  In this case, for example, the restricting member can be configured by a tether that connects the vicinity of the center in the front-rear direction of the ceiling edge side inflating portion of the left and right frame-like inflating portions when expansion is completed. And, when the restriction member is constituted by a tether, if the length of the tether is adjusted, when the inflation of the airbag is completed, the connection between the left panel part and the right panel part where both ends of the tether are connected The width dimension can be easily adjusted. Therefore, for example, if the seat on which the occupant protection device is mounted is for seating a large occupant, the occupant protection device is configured using an airbag in which a tether having a long dimension is disposed in advance, Conversely, if the seat on which the occupant protection device is mounted is for seating a small occupant, the occupant protection device should be configured in advance using an air bag with a short tether. Can do.

Further, in the occupant protection device according to the present invention, the front panel portion at the completion of the inflation of the airbag,
A main body panel disposed opposite to the front side of the occupant head;
An extended panel portion extending downward from the main body panel portion and capable of receiving at least the upper side of the chest of an occupant moving forward;
It is desirable to be configured with.

  In such a configuration, even if the occupant moves forward in the event of a vehicle collision, the extended panel portion of the front panel portion of the airbag that has been inflated receives at least the upper side of the chest of the occupant, The movement of the vehicle to the front is suppressed, and the main body panel portion of the front panel portion receives the occupant head itself in which the moving speed is suppressed. In other words, the occupant can not receive only the occupant's head partly by the front panel part, but also the chest below the occupant, so the occupant can suppress the burden on the neck part by the front panel part. Precisely, the head moving forward is received and protected.

  In the occupant protection device according to the present invention, the front panel portion of the airbag extends vertically along the vertical direction so that the left and right edges when the inflation is completed are closer to each other than before the inflation is completed. It is desirable that a plurality of inflatable portions are arranged side by side.

  Since the vertical expansion portion having such a configuration expands by contracting the dimension in the direction perpendicular to the axis of the vertical expansion portion after expansion from before expansion, the front panel portion is expanded by contraction of the vertical expansion portion when expansion is completed. The left and right edges are brought closer to each other from before the inflation is completed, and the left panel and the right panel connected to the rear from the left and right edges of the front panel are brought closer to each other, It is possible to make the portion directly next to the occupant's head closer. Therefore, in such a configuration, the left panel portion and the right panel portion of the airbag before completion of inflation are arranged on the left and right sides of the occupant's head while suppressing interference, and the inflation of the airbag is completed. Later, the left panel portion and the right panel portion can be brought closer to the left and right of the occupant head. As a result, the left panel portion and the right panel portion of the airbag at the completion of the inflation can receive and protect the occupant head moving left and right more quickly and smoothly.

1 is a schematic side view of an occupant protection device according to an embodiment of the present invention. It is the schematic perspective view which looked at the left panel part side from the front side at the time of completion of inflation of the airbag used for the occupant protection device of the embodiment. It is the schematic side view which looked at the left panel part side at the time of completion of inflation of the airbag used for the occupant protection device of the embodiment. It is the schematic perspective view which looked at the left panel part side from the rear surface side at the time of completion of inflation of the airbag used for the occupant protection device of the embodiment. It is the schematic perspective view which looked at the right panel part side from the front side at the time of completion of inflation of the airbag used for the occupant protection device of the embodiment. It is the schematic side view which looked at the right panel part side at the time of the completion of expansion | swelling of the airbag used for the passenger | crew protection apparatus of embodiment. It is an outline front view at the time of completion of inflation of an air bag used for an occupant protection device of an embodiment. It is a schematic plan view at the time of completion of inflation of the airbag in the occupant protection device of the embodiment. It is the schematic seen from the side surface which shows the state at the time of the action | operation of the passenger | crew protection apparatus of embodiment in order. It is the schematic seen from the front side which shows the state at the time of operation of the crew member protection device of an embodiment in order. It is the schematic side view which looked at the left panel part side which shows the time of completion | finish of operation | movement of the passenger | crew protection apparatus of embodiment. It is a schematic longitudinal cross-sectional view along the front-back direction at the time of the completion | finish of operation | movement of the passenger | crew protection apparatus of embodiment. It is a schematic longitudinal cross-sectional view along the left-right direction at the time of completion | finish of the action | operation of the passenger | crew protection apparatus of embodiment. It is a schematic plan view of the state which the airbag of the modification of embodiment completed the inflation.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An occupant protection device MP according to the embodiment can protect a head H of an occupant M seated on a seat 1 of a vehicle V as shown in FIG. The airbag 15 includes an airbag 15 and an inflator 10 that supplies inflation gas to the airbag 15. As shown in FIGS. 1, 3, and 4, the inflator 10 includes a main body 11 and a diffuser 12 that supplies the inflation gas G discharged from the main body 11 during operation to the inlet portion 32 a of the airbag 15. It is configured. The diffuser 12 has a trifurcated shape made of a metal pipe, the base portion 12a is connected to the main body 11, and the two ends 12c of the bifurcated branch portion 12b are respectively connected to the two inlet portions 32a of the airbag 15. The inner peripheral surface of the inflow port portion 32a is fastened to the tip 12c by a clamp (not shown) and connected to the airbag 15. The inflator 10 is fixedly attached to a mounting base 6 provided inside the backrest 3 of the seat 1. A lead wire (not shown) extending from a predetermined control device for inputting an operation signal to the main body 11 is connected to the main body 11 of the inflator 10. The control device outputs an operation signal to the main body 11 when a collision of the vehicle V is detected.

  The mounting base 6 is also provided with a storage part 8 including a case for storing the folded airbag 15.

  The seat 1 includes a seat portion 2 and a backrest portion 3. The backrest portion 3 includes a main body portion 4 capable of receiving the back B side of the lower occupant M and an occupant head on the upper end side. A headrest portion 5 capable of receiving the rear surface Hb side of the portion H, and a mounting base 6 is disposed inside the main body portion 4.

  Furthermore, the vehicle V on which the seat 1 is mounted can automatically travel. Therefore, there is no problem even if the occupant protection device MP is activated to cover the head H of the driver as the occupant M so that the inflated airbag 15 obstructs the field of view. Further, since the occupant protection device MP is disposed on the backrest portion 3 of the seat 1, the driver as the occupant M is directed in the direction opposite to the traveling direction of the vehicle V, that is, the front windshield WS. Even if the occupant protection device MP is activated while sitting on the seat 1 facing the opposite side, the airbag 15 that has been inflated without any trouble covers the head H of the driver as the occupant M. Thus, the occupant head H can be received and protected.

  The airbag 15 is manufactured using a predetermined material such as bag weaving, injection, blow, or the like, by binding a sheet material such as a flexible polyamide cloth by sewing or bonding. As shown in FIGS. 2 to 8, 12, and 13, the airbag 15 has a substantially rectangular plate-like front panel portion 17 that covers the front surface Hf side, which is the front side of the head H of the occupant M, when the inflation is completed. A substantially rectangular plate-like left panel portion 21 that covers the side of the head H on the left side Hl side, a substantially rectangular plate-like right panel portion 23 that covers the side of the head H on the right side Hr side, It is configured with. That is, the front panel portion 17 of the occupant M seated on the seat 1 is arranged so that these panel portions 17, 21, and 23 are arranged in a substantially U shape around the occupant head H as viewed from above. The front side of the head H as the front side of the head H is covered as being wider than the left and right width dimensions of the occupant head H, and the left panel portion 21 extends from the left edge 17c of the front panel portion 17 in the rear direction BD. Thus, the left side surface Hl of the occupant head H is covered in a state wider than the front and rear width dimensions of the occupant head H, and the right panel portion 23 extends from the right edge 17d of the front panel portion 17 in the rear direction BD. The right side surface Hr of the part H is covered as being wider than the width dimension before and after the occupant head H.

  Furthermore, in the case of the embodiment, the airbag 15 includes a substantially rectangular plate-like ceiling panel portion 25 that covers the upper portion of the occupant head H, a rear surface Hb side as a back side of the head H, and a headrest portion 5. And a substantially rectangular plate-like rear panel portion 27 that is interposed and covered.

  In the present specification, the front-rear and left-right directions are based on the occupant M, the front side of the occupant M is the front, the rear side is the rear, and the left and right are the same as the left and right of the occupant itself.

  And, in the case of the embodiment, the airbag 15 at the time of completion of the inflation has the front edges 21c, 23c of the left panel portion 21 and the right panel portion 23, over the entire length in the vertical direction via the front edge side inflatable portion 40 described later. The front panel 17 is connected to the left and right edges 17c and 17d. Further, the rear edges 21b and 23b of the left panel portion 21 and the right panel portion 23 are connected to the left and right edges 27b and 27c of the rear panel portion 27 over substantially the entire length in the vertical direction via a rear edge side inflating portion 36 described later. The entire outer peripheral edge of the ceiling panel portion 25 is also connected to the upper edge 17a, the left panel portion 21, and the upper edge 21a, 23a of the right panel portion 23 through expansion portions 38, 42, and 44, which will be described later. Furthermore, it is connected to the upper edge 27a of the rear panel portion 27.

  In other words, the airbag 15 of the embodiment is provided with a substantially rectangular opening 15b on the lower edge 15a side as an inflated shape, and the five panel portions 17, 21, 23, 25, 27 are connected to each other. It is configured as a box shape having a substantially rectangular parallelepiped shape.

  The front panel portion 17 is disposed so as to be able to receive the occupant head H moving in the front direction (front direction) FD, which is a direction away from the backrest portion 3 of the seat 1, and the occupant head H moves. If not, when the airbag 15 is completely inflated, a predetermined gap is formed between the head 15 and the head H along the forward direction FD. The left panel portion 21 is disposed so as to be able to receive the occupant head H that moves in the left direction LD. If the occupant head H has not moved, the left panel portion 21 moves in the left direction LD when the inflation of the airbag 15 is completed. A predetermined gap is generated between the head H and the head H. The right panel portion 23 is disposed so as to be able to receive the occupant head H moving in the right direction RD. If the occupant head H is not moving, the right panel portion 23 is moved in the right direction RD when the inflation of the airbag 15 is completed. A predetermined gap is generated between the head H and the head H. The ceiling panel portion 25 is disposed so as to be able to receive the vicinity of the top portion Ht of the passenger head H when the vehicle V rolls over. If the vehicle V does not roll over, the inflation of the airbag 15 is completed. Sometimes, a predetermined gap is generated between the head H and the upper direction UD.

  And in this airbag 15, the front panel part 17 at the time of completion of expansion is extended downward from the main body panel part 18 disposed opposite to the front face Hf side of the occupant head H, and the main body panel part 18. Extending panel portion 19. The extended panel portion 19 is disposed so as to be able to receive at least the upper Cu side of the chest C of the occupant M that moves in the forward direction FD away from the backrest portion 3 of the seat 1 when the inflation of the airbag 15 is completed. In the case of the embodiment, the lower end of the extended panel portion 19 is configured to reach from the bottom of the standard male (dummy AM 50) to the vicinity of the front of the second rib (the vicinity of the upper side).

  In addition, the airbag 15 has an inflow gas G for inflating, and a gas inflow portion 30 that inflates so as to separate the inner wall portion 30a on the head H side of the airbag 15 from the outer wall portion 30b on the outer peripheral side, As a state in which the wall portion 30a and the outer wall portion 30b are combined, a non-inflow portion 70 that does not allow the expansion gas G to flow in is provided (see FIGS. 12 and 13).

  The gas inflow portion 30 includes an initial expansion portion 32 connected to the inlet portion 32a connected to the inflator 10, and a secondary expansion portion 50 that expands after the initial expansion portion 32 (FIG. 2). ~ 7).

  The initial inflating portion 32 is an inflating portion (main channel) disposed in a reverse U-shape as a rod shape (pipe shape) on the upper edge 21a, 23a side of the outer peripheral edge of each of the left panel portion 21 and the right panel portion 23. Inflatable portion) 46 (46L, 46R). These main flow path expansion portions 46 include a rear edge side expansion portion 36 on the rear edges 21b and 23b side, a front edge side expansion portion 40 on the front edges 21c and 23c side, and a rear edge side expansion portion 36 and a front edge side expansion portion 40, respectively. The ceiling edge side expansion part 38 which connects the upper ends 36a and 40a with each other.

  In these main flow path expansion portions 46, the lower end 36b of the trailing edge side expansion portion 36 is serially connected to the inlet portion 32a, and the expansion gas G is connected to the trailing edge side expansion portion 36, the ceiling edge side, which is continuous to the inlet portion 32a. The inflating portion 38 and the leading edge side inflating portion 40 are introduced in this order. The ceiling edge side inflating portion 38 bends the rear end 38b side to be connected to the upper end 36a of the rear edge side inflating portion 36, and the front edge side inflating portion 40 bends the upper end 40a side to make the front end of the ceiling edge side inflating portion 38. Although these are connected to 38a, these expanding portions 36, 38, 40 are arranged in an inverted U shape on the upper edges 21a, 23a of the outer peripheral edges of the left panel portion 21 and the right panel portion 23, respectively. Even if it is bent, the inflation gas G flows easily, and the inner diameter dimensions at the time of inflation (the width dimension when flattened in a non-inflated state) are substantially equal to each other. At the beginning of the inflow of the expansion gas G, the gas expands smoothly and quickly.

  Furthermore, in the airbag 15 of the embodiment, the left and right main flow path inflating portions 46L and 46R are communicated with each other by the inflating portions 42 and 44 that are disposed along the left and right at the bent portions 46a and 46b. The bent portion 46 a is a connection point between the rear end 38 b of the ceiling edge side inflatable portion 38 and the upper end 36 a of the rear edge side inflatable portion 36, and the bent portion 46 b is connected to the upper end 40 a of the front edge side inflatable portion 40 and the ceiling edge side inflatable portion 38. It is a connection location with the front end 38a. Since the inflating part 42 is disposed at the intersection of the ceiling panel part 25 and the rear panel part 27, the inflating part 42 constitutes the rear upper edge side inflating part 42 of the airbag 15, and the inflating part 44 is connected to the ceiling panel part 25 and the front panel part 25. Since it is arranged at the intersection with the panel part 17, the front upper edge side inflating part 44 of the airbag 15 is configured. The rear upper edge side inflating part 42 and the front upper edge side inflating part 44 branch from the main flow path inflating parts 46L and 46R in a direction orthogonal to each other, and the expansion gas G flows in. It is composed.

  In the case of the embodiment, these inflating portions 36, 38, 40, 42, 44 are the five outer surfaces of the substantially rectangular parallelepiped airbag 15 that has been inflated, that is, the front panel portion 17 and the left panel. The part 21, the right panel part 23, the ceiling panel part 25, and the rear panel part 27 are arranged at the mutually intersecting side portions, and if these parts complete expansion in a rod shape, the rigidity like the frame is obtained. This will give shape retention to the airbag 15 when the inflation is completed. Therefore, these inflatable portions 36, 38, 40, 42, 44 constitute a frame-like inflatable portion 34 that can maintain the substantially rectangular parallelepiped shape of the airbag 15.

  However, in the main flow channel expansion portions 46L and 46R configured to include the left and right expansion portions 36, 38, and 40 in the frame-shaped expansion portion 34, the expansion gas G flowing from the inflow port portion 32a flows quickly. . On the other hand, the branch flow channel expansion portion 48 of the rear upper edge side expansion portion 42 or the front upper edge side expansion portion 44 is a mode in which the expansion gas G flows from the main flow path expansion portions 46L and 46R in a direction orthogonal to each other. Compared with the expansion of the main flow path expansion portions 46L and 46R, the expansion is slightly delayed, and the expansion is completed. The secondary expansion portion 50, which will be described later, is distinguished from the main flow path expansion portion 46 of the initial expansion portion 32. It is good.

  The secondary expansion unit 50, except for the branch flow channel expansion unit 48, branches from the main flow channel expansion units 46L and 46R and flows the expansion gas G into the front panel unit 17, the left panel unit 21, and the right side. In the area of the panel part 23, it is comprised from the panel-shaped expansion part 52 expand | swelled in plate shape.

  The front side expansion part 54 as the panel-like expansion part 52 arranged in the front panel part 17 is a bar-like horizontal expansion part 56 extending in the left-right direction at the lower end and a bar-like extension upward from the horizontal expansion part 56 and arranged in parallel on the left and right. The two vertical expansion parts 58 and 58 are comprised. The lateral expansion portion 56 is disposed in a substantially quarter region on the lower end side of the front panel portion 17, communicates with the lower ends 40 b of the left and right front edge side expansion portions 40 at both left and right ends, and flows in the expansion gas G. An inflow port 54a is provided. The two left and right vertical expansion portions 58, 58 have a lower end 58a communicating with the horizontal expansion portion 56, and are approximately 1/2 above the horizontal expansion portion 56 except for approximately 1/4 on the upper side of the front panel portion 17. In this area, the front panel portion 17 is disposed so as to occupy substantially the entire width dimension in the left-right direction.

  The front expansion part 54 is expanded from the left and right front edge side expansion parts 40 through the left and right inflow ports 54a, and the horizontal expansion part 56 is inflated by flowing the expansion gas G into the left and right vertical expansion parts 58 and 58. An expansion gas G is introduced from the expansion portion 56 so as to expand.

  The vertical expansion portions 58 and 58 constitute a head restraint scheduled portion that mainly receives the head H of the occupant M moving in the front direction FD, and the main body panel portion 18 that receives the head H of the front panel portion 17. It becomes the part which constitutes. The lateral inflating portion 56 constitutes a chest restraint scheduled portion for receiving the chest C of the occupant M moving in the forward direction FD, and a portion constituting the extended panel portion 19 for receiving at least the upper Cu of the chest C of the front panel portion 17. Become.

  In addition, in the front side expansion part 54, the vertical expansion part 58 extended along an up-down direction is arranged in parallel (two in this embodiment). Since the vertical expansion portion 58 expands by contracting the dimension in the direction perpendicular to the axis of the vertical expansion portion 58 before and after expansion, the front panel portion 17 contracts the vertical expansion portion 58 when the expansion is completed. By the action, the left and right edges 17c and 17d are brought closer to each other before the expansion is completed, and the left panel portion 21 and the right panel portion 23 extending rearward from the left and right edges 17c and 17d are brought closer to each other. Thus, the front edges 21c and 23c of the left panel part 21 and the right panel part 23 are brought close to each other.

  The vertical inflating portions 58 and 58 are disposed in the vicinity of the middle in the vertical direction of the front panel portion 17 above the lateral inflating portion 56 when the airbag 15 is completely inflated. The front edges 21c and 23c near the center in the vertical direction with the panel unit 23 are brought close to each other.

  The side expansion parts 60 as the panel expansion parts 52 arranged in the left and right left panel parts 21 and the right panel part 23 respectively extend in a bar shape in the vertical direction on the lower side and are arranged in parallel along the front-rear direction. The three vertical expansion portions 61 and one horizontal expansion portion 66 extending in a bar shape in the front-rear direction on the upper side are configured. The three vertical expansion parts 61 are constituted by a rear side part 62, a front side part 63, and a central side part 64 between the rear side part 62 and the front side part 63, and the upper end 61a side is respectively set as a lateral expansion part. 66. And the rear side part 62 arrange | positions the rear side inflow port 60a connected with the lower end 36b vicinity of the rear edge side expansion | swelling part 36 in the rear direction BD side of the lower end, and the front side part 63 is the front direction FD of the lower end. On the side, a front inflow port 60b communicating with the lower end 40b of the front edge side inflating portion 40 is disposed.

  The side surface side expansion section 60 causes the expansion gas G to flow from the rear edge side expansion section 36 to the rear side section 62 of the vertical expansion section 61 via the rear side inlet 60a and from the front edge side expansion section 40 to the front side flow. The expansion gas G is caused to flow into the front side portion 63 of the vertical expansion portion 61 through the inlet 60b, and the horizontal expansion portion 66 allows the expansion gas G to flow from the upper ends 61a of the rear side portion 62 and the front side portion 63. The central side part 64 of the expansion part 61 is configured to inflate by inflating the expansion gas G from the lateral expansion part 66 and to complete the expansion.

  When the expansion is completed, the side surface expansion portion 60 has lower ends 61b of the three vertical expansion portions 61 extending to the lower edges 21d and 23d of the left panel portion 21 and the right panel portion 23, and the lower edges 21d and 23d are occupants. It is formed in a shape that falls in a curved shape from the rear side to the front side so as to contact the upper surface Su of the left and right shoulder portions S of M. And the lower end 61b of the three vertical expansion parts 61 is arrange | positioned so that the lower edges 21d and 23d of the left panel part 21 or the right panel part 23 may be formed, and the three vertical expansion parts 61 itself extended in an up-down direction. However, since the compression in the vertical direction is suppressed, the lower end 61b side of the three vertical inflating portions 61 comes into contact with the upper surface Su side of the left and right shoulder portions S of the head H of the occupant M, and the airbag 15 The support parts 22 and 24 for making the shoulder part S support are comprised.

  Further, when the inflation is completed, the lateral inflating portion 66 is disposed in an approximately half region on the upper side of the side-side inflating portion 60, and moves the head H of the occupant M moving in the left direction LD or the right direction RD. The head restraint scheduled portion to be received is configured.

  Further, in the side surface side expansion portion 60, a plurality of (three in the embodiment) longitudinal expansion portions 61 extending in the vertical direction are arranged in parallel. As described above, since the vertical expansion portion 61 expands by contracting the dimension in the direction perpendicular to the axis of the vertical expansion portion 61 before and after expansion, the left panel portion 21 and the right panel portion 23 When the expansion is completed, the rear edges 21b, 23b and the front edges 21c, 23c are brought closer to each other than before the expansion is completed by the contraction action of the vertical expansion portion 61. Therefore, when the vertical expansion portion 61 completes expansion, the front panel portion 17 in which the left and right edges 17c and 17d are connected to the front edges 21c and 23c of the left panel portion 21 and the right panel portion 23 is the headrest portion 5. The rear panel 27 that is supported and does not move is pulled in the rear direction BD.

  The vertical expansion portion 61 is disposed on the lower edge 21d side of the left and right panel portions 21, 23, and particularly when the vertical expansion portion 61 is completely expanded, the extended panel portion 19 of the front panel portion 17 is configured. The lateral expansion part 56 to be moved closer to the rear panel part 27 side.

  The non-inflow portion 70 is configured to include portions 74, 78, 78, 83, and 86 disposed on the five panel portions 17, 21, 23, 25, and 27 to partition the expansion portion, In order to reduce the expansion volume, it is arranged so as to block between the predetermined expansion parts without arranging the expansion parts.

  The portion 74 is a front side portion 74 disposed on the front panel portion 17, and the front side portion 74 includes a front upper edge side expansion portion 44, left and right front edge side expansion portions 40 and 40, and left and right vertical expansion portions 58, 58 is configured to include a plate-like portion 75 and a linear closing portion 76 that are disposed so as to close the space 58. The linear closing portion 76 extends downward from the left and right edges of the plate-like portion 75, and the edge-side portion 76 a that separates the left and right front edge side inflating portions 40 and the vertical inflating portion 58, and the plate-like portion 75. And a central side portion 76b that extends downward from the center in the left-right direction and divides the left and right vertical expansion portions 58.

  The part 78 is a part provided in the left panel part 21 and the right panel part 23, respectively, and is configured to include linear closing parts 79, 80, 81. The linear closing portion 79 is disposed in an inverted U shape along the main flow path expansion portion 46 on the inner peripheral side of the reverse U-shaped main flow path expansion portion 46, and expands from the main flow path expansion portion 46 and the side surface side expansion. It is arranged so as to partition the portion 60. The front end (lower end) 79a, 79b of the rear end side and the front end side of the linear closing portion 79 is between the lower edge 15a of the airbag 15 and the rear inlet 60a and the front inlet of the side-side inflating portion 60. 60b is provided close to the lower edge 15a.

  The linear closing portion 80 extends upward from the lower edge 15a of the airbag 15 and is disposed so as to partition the rear side portion 62 and the central side portion 64 of the longitudinally expanding portion 61. The linear closing portion 81 is The airbag 15 extends upward from the lower edge 15a of the airbag 15, and is disposed so as to partition the front side portion 63 and the central side portion 64 of the vertical inflating portion 61.

  The part 83 is a ceiling side part 83 disposed in the ceiling panel part 25, and includes a plate-like part 84. The plate-like portion 84 is disposed in a substantially rectangular plate shape that closes a portion surrounded by the left and right ceiling edge side expansion portions 38, 38, the rear upper edge side expansion portion 42, and the front upper edge side expansion portion 44. The portion 86 is a rear side portion 86 disposed on the rear panel portion 27, and includes a plate-like portion 87. The plate-shaped portion 87 is disposed in a substantially rectangular plate shape that closes a portion surrounded by the left and right rear edge side expansion portions 36, 36 and the rear upper edge side expansion portion 42.

  Further, the airbag 15 of the embodiment is provided with a regulating member 90 that regulates the movement of the main flow path inflating portions 46L and 46R in the left and right frame-like inflating portions 34 in the mutually separated direction. In the case of the embodiment, the restricting member 90 is located in the vicinity of the center 38c between the rear end 38b and the front end 38a of the left and right ceiling edge side expansion portions 38, 38 at the time of completion of expansion, and the front end 38a of the left and right ceiling edge side expansion portions 38. It arrange | positions so that it may approach, compared with mutual. The restricting member 90 according to the embodiment expands the left and right ends 91a and 91b on the left and right ceiling edge sides so that the vicinity of the center 38c between the rear end 38b and the front end 38a in the left and right ceiling edge side expansion portions 38 and 38 are close to each other. It is constituted by a tether 91 coupled in the vicinity of the center 38c of the portions 38, 38.

  In addition, regarding each panel part 17,21,23,25,27 of the airbag 15 of embodiment, if the structure of the gas inflow part 30 and the non-inflow part 70 is added and demonstrated, the front panel part 17 will be panel-shaped expansion | swelling From the front side inflating part 54 of the part 52, the inner edge side portions of the left and right front edge side inflating parts 40, 40 and the front upper edge side inflating part 44 of the frame-like inflating part 34, and the front side part 74 of the non-inflow part 70 Composed. The left panel portion 21 and the right panel portion 23 are respectively a side-side inflating portion 60 of the panel-like inflating portion 52, a portion on the inner edge side of the main channel inflating portion 46, a side-side side portion 78 of the non-inflow portion 70, Consists of The ceiling panel portion 25 includes a portion on the inner edge side between the left and right ceiling edge side expansion portions 38 and 38 in the frame-shaped expansion portion 34 and the front and rear branch flow channel expansion portions 48 (42 and 44), and the ceiling side in the non-inflow portion 70. A plate-like portion 84 of the portion 83 and a tether 91 are configured. The rear panel portion 27 includes a plate-like portion 87 of the rear side portion 86 in the non-inflow portion 70 and a portion on the inner edge side of the left and right rear edge side expansion portions 36 and 36 and the rear upper edge side expansion portion 42 in the frame-shaped expansion portion 34. And.

  In addition, with respect to each of the panel portions 17, 21, 23, 25, and 27, except for the portion of the frame-shaped expansion portion 34 and the tether 91, the front panel portion 17 is not connected to the front expansion portion 54 of the panel-shaped expansion portion 52. The left panel portion 21 and the right panel portion 23 are respectively composed of the side-side expansion portion 60 of the panel-shaped expansion portion 52 and the side surface of the non-inflow portion 70. The ceiling panel portion 25 is composed of a plate-like portion 84 of the ceiling side portion 83 in the non-inflow portion 70, and the rear panel portion 27 is a rear side portion in the non-inflow portion 70. 86 plate-like portions 87 are formed.

  In the occupant protection device MP according to the embodiment, the airbag 15 is folded and attached while the inflator 10 is connected to the inlet portion 32a of the airbag 15 and stored in the predetermined storage portion 8 of the backrest portion 3 of the seat 1. If the lead wire for inputting a predetermined operation signal is connected to the inflator 10 while the seat 1 is attached and fixed to the base 6 and the seat 1 is assembled to the vehicle V, the occupant protection device MP can be mounted on the vehicle V.

  Thereafter, when the vehicle V collides and an operation signal is input to the inflator 10, the main body 11 of the inflator 10 generates the expansion gas G, and the expansion gas G passes through the diffuser 12 of the inflator 10 and flows into the inlet. The air flows into the airbag 15 from the portion 32a.

  Therefore, the airbag 15 protrudes from the storage part 8 while inflating the initial inflating portion 32 by inflating the inflating gas G. That is, the airbag 15 sequentially inflates the trailing edge side inflating portion 36, the ceiling edge side inflating portion 38, and the leading edge side inflating in the left and right main flow path inflating portions 46L and 46R in the initial inflating portion 32 by the inflow of the inflating gas G. The part 40 expands, and then the rear upper edge side expansion part 42 and the front upper edge side expansion part 44 of the branch flow path expansion part 48 as the secondary expansion part 50 expand, and the secondary expansion part 50 substantially simultaneously. The panel-like inflating part 52 expands (see FIGS. 9 and 10).

  In the panel-like expansion portion 52, since the inertial force of the flow of the expansion gas G flowing through the main flow path expansion portions 46L and 46R is large, first, the expansion gas is strongly directed toward the lower end 40b side of the leading edge side expansion portion 40. G flows, and the expansion gas is introduced from the left and right inlets 54a, 54a of the front expansion portion 54. The lateral expansion portion 56 expands, and the expansion gas G from the lateral expansion portion 56 expands the left and right longitudinal expansions. Part 58 also expands. In the left and right side expansion parts 60, the expansion gas G flows from the front edge side expansion parts 40 and the rear edge side expansion parts 36 of the main flow path expansion parts 46L and 46R through the inlets 60b and 60a. The front side portion 63 and the rear side portion 62 of the vertical expansion portion 61 are expanded, and then the lateral expansion portion 66 is expanded by the expansion gas G from the front side portion 63 and the rear side portion 62, and the horizontal expansion portion 66 is then expanded. The central side portion 64 of the longitudinal expansion portion 61 is expanded by the expansion gas G from the vertical expansion portion 61. Further, the panel-like expansion of the left and right panel portions 21 and 23 is performed until the support portions 22 and 24 on the lower edges 21d and 23d side of the left and right panel portions 21 and 23 are supported by the upper surface Su of the shoulder S of the occupant M. The portion 52 is inflated, and the airbag 15 is completely inflated.

  As described above, in the occupant protection device MP of the embodiment, when the airbag 15 flows in the inflation gas G to complete the inflation, the left panel portion 21 and the right panel portion 23 are connected to the frame-like inflation portion 34. The main flow path inflating portions 46L and 46R are disposed on the side of the left side surface Hl and the right side surface Hr of the occupant head H in a state in which shape retention is exhibited. Then, the movement of the main channel expansion portions 46L and 46R in the frame-shaped expansion portion 34 between the left panel portion 21 and the right panel portion 23 is restricted by the restriction member 90 in the left and right outward directions. Therefore, as shown in FIG. 13, for example, even if the occupant head H moves in the left direction LD and the left panel unit 21 receives the occupant head H, the left panel unit 21 is separated from the right panel unit 23. It is difficult to move in the direction, and the reaction force can be secured quickly and the moving occupant head H can be received. On the other hand, even if the occupant head H moves in the right direction RD and the right panel portion 23 receives the occupant head H, the right panel portion 23 is difficult to move in a direction away from the left panel portion 21 and quickly sways. It is possible to secure the force and catch the moving occupant head H. Further, the left panel portion 21 and the right panel portion 23 are disposed so as to extend in the rearward direction BD from the left and right edges 17c and 17d of the front panel portion 17, and on the left and right sides of the occupant head H, Since it is arranged along the front-rear direction so as to be substantially left-right symmetric without increasing the width dimension in the direction, the left and right panel portions even if the occupant head H moves in the left-right direction The passenger head H can be immediately received and protected by the side portions 21e, 23e of the passenger head H approaching from the front and rear edges 21c, 21b, 23c, 23b of the 21, 23.

  Therefore, in the occupant protection device MP according to the embodiment, when the head H of the occupant M seated on the seat 1 moves left and right at the time of a vehicle collision, the airbag 15 that has completed the inflation quickly and accurately. Part H can be received.

  In the occupant protection device MP according to the embodiment, the restriction member 90 of the airbag 15 moves to the left and right in the vicinity of the center 38c in the front-rear direction in the ceiling edge side inflating portions 38, 38 of the left and right frame-like inflating portions 34 when the inflation is completed. Compared to the front ends 38a of the ceiling edge side inflating portions 38, 38, they are arranged so as to approach each other.

  Therefore, in the embodiment, as shown in FIG. 8, the left and right frame-shaped inflatable portions 34 have a distance Wc between the ceiling edge side inflating portions 38, 38 in the front-rear direction center 38 c and the ceiling edge side inflating portions 38, 38. The left and right left panel portions 21 and 23 are arranged in the vicinity of the center 21ac in the front-rear direction on the upper edges 21a and 23a side from each other on the front edge 21af side. The airbag 15 complete | finishes expansion | swelling as the state made to approach (refer FIG.2, 5). Therefore, on the left and right sides of the occupant head H, the center 21ac portion on the upper edges 21a and 23a side of the left panel portion 21 and the right panel portion 23 is directly beside the head H of the left panel portion 21 and the right panel portion 23. Together with the parts (receiving parts) 21e and 23e, the occupant head H is wrapped in the left and right so as to be closer to the occupant head H and approximate to a helmet (see FIG. 13). As a result, with such a configuration, the airbag 15 at the completion of inflation can receive and protect the occupant head H more quickly when the occupant head H moves in the left direction LD or the right direction RD. In FIG. 13, regarding the receiving portions 21e and 23e, a state where the tether 91 as the restricting member 90 is not used is indicated by a two-dot chain line, and a state where the tether 91 is used is indicated by a solid line.

  In the case of the embodiment, the restriction member 90 is constituted by the tether 91, and the tether 91 constituting the restriction member 90 is a ceiling in the main flow path inflating portions 46L and 46R of the left and right frame-like inflating portions 34 when the expansion is completed. The vicinity of the centers 38c, 38c in the front-rear direction of the edge side inflating portions 38, 38 are connected to each other. As described above, when the restriction member 90 is configured by the tether 91, the left panel portion in which both ends 91a and 91b of the tether 91 are connected when the inflation of the airbag 15 is completed by adjusting the length dimension of the tether 91. It is possible to easily adjust the width dimension between the connecting portions of 21 and the right panel portion 23. Therefore, for example, if the seat on which the occupant protection device is mounted is for seating a large occupant, the occupant protection device is configured using an airbag in which a tether having a long dimension is disposed in advance, Conversely, if the seat on which the occupant protection device is mounted is for seating a small occupant, the occupant protection device should be configured in advance using an air bag with a short tether. Can do.

  If the above points are not taken into consideration, without using a tether, for example, as in the airbag 15A shown in FIG. Is provided. The ceiling-side expansion portion 68 is configured by arranging vertical expansion portions 68a that expand in a bar shape along the front-rear direction in parallel along the left-right direction. The ceiling side inflating portion 68 is arranged so that the inflating gas flows from the rear upper edge side inflating portion 42 or the front upper edge side inflating portion 44. And you may comprise 90A of regulation members (regulation part) from the ceiling panel part 25 which provided these vertical expansion parts 68a. Even in such a configuration, if these vertical expansion portions 68a expand, the horizontal dimension of the ceiling panel portion 25 narrows, and the upper edges 21a, 23a side of the left panel portion 21 and the right panel portion 23 approach each other. Thus, the lateral portions 21e and 23e of the left panel portion 21 and the right panel portion 23 can be brought close to each other. Furthermore, these vertical expansion portions 68a may be disposed only in the vicinity of the center 38c of the ceiling edge side expansion portion 38. In the restriction member (regulation part) 90A provided with such a vertical expansion part 68a, only the vicinity of the center 38c of the left and right ceiling edge side expansion parts 38 can be brought closer to each other compared to the front end 38a.

  Further, in the occupant protection device MP of the embodiment, the front panel portion 17 when the airbag 15 is completely inflated has a main body panel portion 18 disposed opposite to the front surface Hf side of the occupant head H, and a main body panel portion. An extended panel portion 19 that extends downward from 18 and can receive at least the upper Cu side of the chest C of the occupant M that moves forward is configured.

  Therefore, in the embodiment, even when the occupant M moves in the front direction FD at the time of a vehicle collision, as shown in FIG. 12, the lateral inflating portion 56 of the front panel portion 17 in the airbag 15 that has been inflated is provided. The extended panel portion 19 receives at least the upper Cu side of the chest C of the occupant M, suppresses the movement of the occupant M in the forward direction FD, and is provided with the longitudinal expansion portion 58 of the front panel portion 17. The main body panel unit 18 receives the occupant head H itself. In other words, the occupant M is not only partially received by the front panel portion 17 but also the chest C below the occupant head H. Therefore, the occupant M extends from the main body panel portion 18 of the front panel portion 17. By means of the panel part 19, the occupant M is protected by receiving the head H that moves in the forward direction FD accurately while suppressing the burden on the neck N.

  In the case of the embodiment, the extended panel portion 19 of the front panel portion 17 is configured to be able to receive the chest C before the main body panel portion 18 receives the occupant head H. Therefore, when the occupant head H moves forward, the airbag 15 at the time of completion of inflation first stops the extended panel 19 by receiving the front Cf side of the chest C, thereby reducing the speed of the occupant M moving forward. Since the main body panel portion 18 can receive the head H of the occupant M in a state where the moving speed in the forward direction FD is suppressed, the main body panel portion 18 further burdens the neck N of the occupant M. And the passenger head H can be received and protected accurately.

  Furthermore, if the extended panel portion 19 of the front panel portion 17 can catch the chest C of the occupant M, the movement of the occupant M trying to slip through the seat belt can also be suppressed.

  Incidentally, if the above points are not taken into consideration, the extension panel 19 receives the chest C, and at the same time the main body panel 18 receives the occupant head H, or the main body panel 18 receives the occupant head H. The extension panel 19 may be configured to receive the chest C after a short delay.

  Furthermore, if the above points are not taken into consideration, the extended panel portion 19 that receives the chest C may not be provided on the front panel portion 17. In the case of such a configuration, the lateral inflating portion 56 is arranged so as to move upward, and the lateral inflating portion 56 is arranged in the region of the main body panel portion 18 that receives the occupant head H. Or you may comprise so that the lower end 40b vicinity of the front edge side expansion part 40 may be directly connected with the lower end 58a of the vertical expansion part 58, without arrange | positioning the horizontal expansion part 56. FIG. Even if comprised in this way, the passenger | crew head H which moves to a front direction is received by the front panel part 17, and is protected.

  In the occupant protection device MP of the embodiment, the front panel portion 17 of the airbag 15 extends in the vertical direction so that the left and right edges 17c and 17d at the time of completion of inflation approach each other from before completion of inflation. A plurality of (two in the embodiment) vertically expanded portions 58 extending in parallel are arranged.

  The vertical expansion portion 58 having such a configuration expands by contracting the dimension in the direction perpendicular to the axis of the vertical expansion portion 58 before and after expansion, so that the front panel portion 17 is expanded when the expansion is completed. The left and right edges 17c and 17d are brought closer to each other before the expansion is completed by the contraction action of the left panel part 21 and the right side of the front panel part 17 connected to the left and right edges 17c and 17d in the rear direction BD. The panel part 23 is brought close to each other (refer to the movement mode of the left panel part 21 and the right panel part 23 in the state shown by the solid line from the two-dot chain line in D of FIG. 10). The parts (receiving parts) 21e and 23e can be brought closer to the occupant head H. Therefore, in such a configuration, the left panel portion 21 and the right panel portion 23 of the airbag 15 before the completion of inflation are arranged on the left and right sides of the occupant head H while suppressing interference, and the air After the bag 15 has been inflated, the left panel portion 21 and the right panel portion 23 can be brought close to the left and right left side surfaces Hl and right side surfaces Hr of the occupant head H. As a result, the right side portions (receiving portions) 21e and 23e between the left panel portion 21 and the right panel portion 23 of the airbag 15 at the time of completion of the inflation move the occupant head H that moves further to the left and right more quickly and smoothly. It can be received and protected.

  If this point is not taken into consideration, with respect to the front side expansion portion 54 as the panel-like expansion portion 52 of the front panel portion 17, only one vertical expansion portion 58 is provided or the vertical expansion portion 58 is not provided and the horizontal expansion portion 58 is not provided. A plurality of inflatable portions 56 may be provided along the vertical direction.

  Further, in the airbag 15 of the embodiment, the rear panel portion 27 is provided, but the plate-like portion 87 of the rear side portion 86 as the non-inflow portion 70 of the rear panel portion 27 is provided partially, or It is good also as a structure which does not provide the rear side part 86 which consists of a plate-shaped part 87 at all.

  In addition, in the occupant protection device MP of the embodiment, the airbag 15 at the completion of the inflation is configured to include a ceiling panel portion 25 that covers the upper portion of the occupant head H. Therefore, in the embodiment, when the vehicle V collides, even if the vehicle V rolls over, the ceiling panel portion 25 of the airbag 15 can receive the top Ht side of the occupant head H. It is possible to accurately protect the occupant head H at the time of a vehicle collision of the variation.

  In the embodiment, the ceiling panel portion 25 is configured by providing the plate-like portion 84 as the ceiling side portion 83 as the non-inflow portion 70. However, the plate-like portion 84 may be partially provided. . Or you may provide the panel-shaped expansion part 52 with the non-inflow part 70 in the ceiling panel part 25 like the airbag 15A mentioned above.

  Of course, the ceiling panel portion 25 may not be provided if measures for rolling over the vehicle V are not taken into consideration.

  In addition, in the occupant protection device MP of the embodiment, the initial inflating portion 32 that inflates by inflating the inflating gas G of the airbag 15 has the upper edge 21a of the outer peripheral edge of each of the left panel portion 21 and the right panel portion 23. , 23a side, the rear edge side expansion portion 36 on the rear edges 21b, 23b side, the front edge side expansion portion 40 on the front edges 21c, 23c side, and the rear edge side expansion portion so as to expand in an inverted U shape. 36 and a ceiling edge side expansion part 38 disposed so as to connect the upper ends 36a, 40a of the leading edge side expansion part 40 to each other, and the expansion gas G is supplied to the trailing edge side expansion part 36 and the ceiling. It is comprised so that the edge side expansion part 38 and the front edge side expansion part 40 may be made to flow in order.

  Therefore, in the embodiment, when the initial expansion portion 32 expands due to the inflow of the expansion gas G, the expansion gas G is moved to the rear side of the upper edge 21a, 23a of the left panel portion 21 and the right panel portion 23, respectively. The edge side inflating part 36, the ceiling edge side inflating part 38, and the front edge side inflating part 40 are introduced in this order and inflated sequentially. That is, the airbag 15 includes the rear edge side inflating portion 36, the ceiling edge side inflating portion 38, and the leading edge side inflating portion of the main channel inflating portions 46L and 46R of the left panel portion 21 and the right panel portion 23 on the upper edges 21a and 23a side. 40, when inflating, the rear surface Hb side of the occupant head H is inflated, then the upper side of the occupant head H is inflated, and the state is inflated on the front surface Hf side of the occupant head H. Become. For this reason, even if the front panel portion 17 is configured to expand by extending the lower extended panel portion 19 to the chest C below the occupant head H, the expanded panel portion 19 is expanded to the occupant head H during expansion. Without being interfered with, it can be arranged on the front face Cf side of the occupant chest C from the rear face Hb side of the occupant head H, over the occupant head H, to the front face Hf side. . And if the extended panel part 19 is arrange | positioned on the front Cf side of the passenger | crew chest C without interfering with the passenger | crew head H, the other left panel part 21 and the right panel part 23 will also be exactly right and left of the passenger | crew head H. As a result, the airbag 15 can smoothly arrange the portions 17, 21, 23, 25, 27 around the occupant head H to complete the inflation.

  In particular, in the embodiment, the airbag 15 is held by connecting the inflow port 32a on the lower end 36b side of the rear edge side inflating portion 36 to the inflator 10 below the rear direction BD of the occupant head H. With the holding part (inlet part) 32a as the center of rotation, the extended panel 19 is covered from the rear surface Hb side of the occupant head H to the front surface Hf side above the occupant head H. The bag 15 is inflated (see FIG. 9). Therefore, even if the airbag 15 has a substantially rectangular parallelepiped shape having an opening 15b on the lower edge 15a side, the interference is prevented so that the box is rotated and covered around the holding portion (inlet portion) 32a. It can be smoothly arranged around the occupant head H.

  Further, in the embodiment, as shown in FIGS. 11 and 13, the airbag 15 at the time of completion of the inflation has the lower edges 21 d and 23 d side of the left panel portion 21 and the right panel portion 23 on the head of the occupant M. The support portions 22 and 24 are configured to be able to be supported by the shoulder portion S in contact with the upper surface Su side of the left and right shoulder portions S of H.

  Therefore, in the embodiment, when the inflation of the airbag 15 is completed, the left and right left panel portions 21 and the support portions 22 and 24 on the lower edges 21d and 23d side of the right panel portion 23 are the upper surfaces of the left and right shoulder portions S of the occupant M. Since it is supported in contact with the Su side, the arrangement position of the airbag 15 with respect to the occupant head H when the inflation is completed is stabilized, and each part of the airbag 15 is more accurately placed around the occupant head H. Can be placed. Moreover, if the height dimension LV (refer FIG. 12) of the up-down direction from the support parts 22 and 24 to the upper edges 21a and 23a of the left and right panel parts 21 and 23 is adjusted, according to the physique of the passenger | crew M to protect, The airbag 15 can be configured more appropriately. That is, on the seat on which an occupant having an average physique sits, the occupant's head is large and disposed at a high position. In particular, a seat on which an occupant having a small physique is seated has a small occupant head and is disposed at a low position.

  In addition, the support parts 22 and 24 of embodiment are comprised from the lower end 61b side of the vertical expansion part 61 extended in the up-down direction, and the vertical expansion part 61 itself is suppressed to the compression of an up-down direction, and predetermined shape maintenance is carried out. It can be supported by the shoulder S while maintaining the sex.

  Furthermore, in addition, in the occupant protection device MP of the embodiment, the left panel portion 21 and the right panel portion 23 of the airbag 15 are respectively provided with the rear edges 21b and 23b and the front edges 21c and 23c when the inflation is completed. Before the expansion is completed, a plurality of (three in the embodiment) longitudinal expansion portions 61 extending in the vertical direction are arranged side by side so as to approach each other.

  Since the vertical expansion portion 61 having such a configuration expands by contracting the dimension in the direction perpendicular to the axis of the vertical expansion portion 61 before and after expansion, the left panel portion 21 and the right panel portion 23 are respectively When the expansion is completed, the rear edge 21b, 23b and the front edge 21c, 23c of the occupant head H are brought closer to each other before the expansion is completed by the contraction action of the vertical expansion portion 61, and the front panel portion 17 is moved to the headrest. Pulling is performed in the rear direction BD on the rear panel portion 27 side that is restricted by the portion 5 (see the movement mode of the front panel portion 17 in the state indicated by the solid line from the two-dot chain line in D of FIG. 9). Therefore, in such a configuration, the front panel portion 17 of the airbag 15 before completion of inflation is disposed in front of the occupant head H while suppressing interference, and after the inflation of the airbag 15 is completed, The portion 17 can be brought closer to the front surface Hf side of the occupant head H. As a result, the front panel portion 17 of the airbag 15 when inflated can catch and protect the occupant head H moving in the forward direction FD away from the backrest portion 3 of the seat 1 more quickly and smoothly. It becomes.

DESCRIPTION OF SYMBOLS 1 ... Seat, 15 ... Air bag, 17 ... Front panel part, 18 ... Main body panel part, 19 ... Extension panel part, 21 ... Left panel part, 21a ... Upper edge, 21b ... Rear edge, 21c ... Front edge, 23 ... Right panel part, 23a ... Upper edge, 23b ... Rear edge, 34 ... Frame-shaped expansion part, 36 ... Rear edge side expansion part, Upper end 36a, 38 ... Ceiling edge side expansion part, 38a ... Front end, 38c ... Center, 40 ... Front Edge side expansion part, 40a ... upper end, 58 ... vertical expansion part, 90 ... regulating member, 91 ... tether,
M ... occupant, H ... head, Hf ... (front) front, Hl ... left side, Hr ... right side, C ... chest, Cu ... upper part, G ... inflation gas, V ... vehicle, MP ... occupant protection device.

Claims (5)

An airbag that is inflated by inflating an inflation gas at the time of a vehicle collision is an occupant protection device configured to receive an occupant's head seated on a vehicle seat,
The airbag at the completion of inflation
As seen from above, it is arranged in a substantially U shape around the passenger's head,
A front panel portion that covers the front of the front side of the head of the occupant seated on the seat and can receive the occupant head moving forward;
A left panel portion extending rearward from the left edge of the front panel portion, covering the left side surface of the occupant head, and capable of receiving the occupant head moving left;
A right panel portion extending rearward from the right edge of the front panel portion, covering the right side surface of the occupant head, and capable of receiving the occupant head moving to the right;
And configured with
The rear edge side inflating portion, the leading edge side inflating portion, and the leading edge side inflating portion so that the left panel portion and the right panel portion are inflated in an inverted U shape on the upper edge side of the outer peripheral edge of each of the left panel portion and the right panel portion, and Left and right frame-like inflating portions each having a ceiling edge-side inflating portion disposed so as to connect the upper ends of the trailing edge-side inflating portion and the leading edge-side inflating portion; and
An occupant protection device comprising: a restricting member for restricting movement of the left and right frame-shaped inflating portions in the direction of separation from each other.   The control member of the airbag is closer to the center in the front-rear direction of the ceiling edge side inflated part of the left and right frame-like inflated parts when inflation is completed, compared to the front ends of the left and right ceiling edge side inflated parts. The occupant protection device according to claim 1, wherein the occupant protection device is disposed so as to allow the occupant to protect the passenger.   3. The occupant according to claim 2, wherein the restricting member includes a tether that connects the vicinity of the center in the front-rear direction of the ceiling edge side inflating portion of the left and right frame-like inflating portions when inflation is completed. Protective device. The front panel when the airbag is completely inflated,
A main body panel disposed opposite to the front side of the occupant head;
An extended panel portion extending downward from the main body panel portion and capable of receiving at least the upper side of the chest of an occupant moving forward;
The occupant protection device according to any one of claims 1 to 3, wherein the occupant protection device is provided. The front panel portion of the airbag is
The left and right edges at the time of completion of expansion are configured by juxtaposing a plurality of vertical expansion portions extending in the vertical direction so as to approach each other from before completion of expansion. The occupant protection device according to claim 4.

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