JP2017043319A - Head part protective airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head part protective airbag device which can smoothly protect of a crewman when approaching or oblique collision of a head part of a crewman.SOLUTION: A head part protective airbag device M comprising an air bag 20 which is so stored as to be folded onto an upper edge side of windows W1, W2, and is so configured as to cause an inflation gas from an inflator 14 to flow therein and is inflated so as to cover an indoor side of the windows W1, W2. The air bag 20 comprises: a main inflation part 24 which is located on a lateral side of a crewman who seated on a seat at the time of completion of inflation; and sub inflation parts 30, 31, 32 which are so located as to approach a position on the front side of the main inflation part 24 at the time of completion of inflation, and are communicated withe the main inflation part 24, and of which inflation is completed after completion of inflation of the main inflation part 24. In the sub inflation parts 30, 31, 32, a friction resistance of at least an indoor side face at the time of completion of inflation is so set as to be larger than a friction resistance of at least the indoor side face at the time of completion of inflation of the main inflation part 24.SELECTED DRAWING: Figure 6

Description

  The present invention is folded and stored on the upper edge side of the window on the vehicle interior side, and the upper edge side is attached and fixed to the body side of the vehicle so that the inflation gas from the inflator flows in and protrudes downward from the storage portion. The present invention relates to a head protection airbag device configured to include an airbag configured to inflate so as to cover the vehicle interior side of the window.

  Conventionally, as a head protection airbag device, an airbag is disposed on the side of the head of an occupant seated on a seat when inflation is completed, and a sub-inflation portion is disposed on the front side of the main inflation portion. There was a thing of the composition provided with the air bag which has these (for example, refer to patent documents 1). In this conventional head protection airbag device, the sub-inflation portion has a configuration in which the surface of the base fabric constituting the sealing member is subjected to a sealing process to suppress a decrease in internal pressure after completion of the inflation.

JP 2012-201312 A

  In this conventional head protection airbag device, it is possible to smoothly receive the head of the occupant during rollover of the vehicle by suppressing a decrease in the internal pressure of the sub-inflation portion in the airbag after completion of inflation. However, in this conventional head protection airbag device, head protection during vehicle rollover is taken into consideration, but when the passenger inflates the airbag with the head close to the window, The passenger head protection at the time of a collision is not taken into consideration, and even in such a case, there is room for improvement in that the passenger's head can be protected smoothly.

  The present invention solves the above-described problems, and an object of the present invention is to provide a head protection airbag device that can smoothly protect the occupant's head even when the occupant is in the vicinity of the head or at a slant. And

The head protection airbag device according to the present invention is folded and housed on the upper edge side of the window inside the vehicle, and the upper edge side is attached and fixed to the vehicle body side to allow the inflation gas from the inflator to flow in. A head protection airbag device configured to include an airbag configured to inflate so as to cover the vehicle interior side of the window while projecting downward from the storage portion.
Airbag
A main inflating part that is arranged on the side of the head of the occupant seated in the seat when the inflating is completed and protects the head;
A sub-expansion part that is arranged close to the position on the front side of the occupant in the main inflating part when the inflating is completed, communicates with the main inflating part, and completes the inflating after the inflating of the main inflating part;
It is set as the composition provided with
The sub-expansion portion is characterized in that the frictional resistance of at least the vehicle inner surface at the completion of expansion is set to be greater than the friction resistance of at least the vehicle inner surface at the completion of expansion of the main expansion portion.

  In the head protection airbag device of the present invention, the main inflating portion arranged on the side of the head seated on the seat at the time of completion of inflating reduces the frictional resistance of the inside surface of the vehicle at the time of inflating to the inside surface of the sub inflating portion. Because it is set to be smaller than the frictional resistance, even if the occupant deploys and inflates the airbag with the head in proximity to the window, the head is It can be developed to slip through the head. Therefore, it is possible to cover the inside of the window with the main inflating portion while suppressing the strong pressing of the head. In addition, when the occupant moves toward the vehicle outer side obliquely forward at the time of the oblique collision, the main inflating portion that contacts the head moving toward the vehicle outer side diagonally forward is set to have a small frictional resistance. Therefore, the head can be smoothly slid by the main inflatable part in a state in which the head is prevented from being caught and the head can be slid, and the turning of the nose tip toward the outside of the vehicle is suppressed. I can take it.

  Therefore, in the head protection airbag device of the present invention, the occupant's head can be protected smoothly even when the occupant is in the vicinity of the head or at the time of oblique collision.

  Further, in the head protection airbag device of the present invention, since the auxiliary inflating portion is set to have a large frictional resistance on the inner side surface of the vehicle, when the vehicle is rolled over, The movement can be suppressed, the head can be accurately received, and the release of the head outside the vehicle can be suppressed.

  Specifically, in the head protection airbag device of the present invention, a seat body that is set to have a frictional resistance smaller than that of the sub-inflation portion may be attached to the inner side surface of the main inflation portion when the inflation is completed. Preferably, more specifically, the airbag preferably includes a bag body formed of a coated cloth having a coating agent applied to the outer surface side, and a sheet body formed of a non-coated cloth. .

  If the head protection airbag device is configured as described above, the entire bag body is formed from a coated cloth having a coating agent applied to the outer surface side. Even during the rollover, the head of the occupant can be more accurately protected by the bag body that maintains the internal pressure. In addition, by attaching a sheet body formed of a non-coated cloth to the inner side surface of the main inflating portion, the main inflating portion can be set to have a lower frictional resistance than the sub inflating portion. A bag can be easily manufactured.

  Furthermore, in the head protection airbag device having the above-described configuration, if the seat body is configured to couple the upper edge side and the lower edge side when the inflation is completed to the bag body, the sheet body is placed in the bag at the upper and lower intermediate portions. It can be moved up and down with respect to the main body, and when it comes into contact with the occupant's head that is close to the window during deployment, or when receiving the occupant's head during an oblique collision, the head is seated The seat body itself, which has received the head, can be displaced relative to the bag body, in other words, the bag body with the seat body itself in contact with the occupant's head. Can be smoothly deployed while being displaced downward relative to the seat body, and it is possible to suppress the occupant's head strongly and more precisely, which is preferable.

It is the schematic front view which looked at the head protection airbag apparatus which is one Embodiment of this invention from the vehicle inside. It is sectional drawing of the II-II site | part of FIG. It is a front view of the state where the air bag used with the head protection air bag device of an embodiment was developed flat. It is sectional drawing of the IV-IV site | part of FIG. FIG. 4 is a front view showing a state in which a bag body and a sheet body are arranged in the airbag of FIG. 3. In the head protection airbag device of an embodiment, it is the outline front view which looked at the state where the airbag completed inflation from the car inside. In the head protection airbag device of the embodiment, it is a schematic partial enlarged cross-sectional view along the front-rear direction showing a state in which the airbag is completely inflated. In the head protection airbag device of an embodiment, it is a schematic sectional view in the up-and-down direction which shows the state where an airbag expands.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the head protection airbag device M of the embodiment is mounted on a two-row seat type vehicle V having two windows (side windows) W1 and W2. As shown in FIG. 1, the head protection airbag device M according to the embodiment includes an airbag 20, an inflator 14, mounting brackets 11 and 16, and an airbag cover 9. As shown in FIG. 1, the airbag 20 passes from the lower edge side of the front pillar portion FP to the lower edge side of the roof side rail portion RR from the lower edge side of the front pillar portion FP on the upper edge side of the windows W1 and W2 inside the vehicle V. The upper area is folded and stored.

  As shown in FIGS. 1, 2, 7, and 8, the airbag cover 9 includes a front pillar garnish 4 disposed in the front pillar portion FP and a roof head lining 5 disposed in the roof side rail portion RR. It consists of the lower edge. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin and fixed to the vehicle inner side I of the inner panel 2 on the body (vehicle body) 1 side in the front pillar portion FP and the roof side rail portion RR, respectively. Has been. Further, the airbag cover 9 is pushed by the airbag 20 so as to cover the inside of the airbag 20 that is folded and stored, and to allow the airbag 20 to be protruded downward in the interior of the vehicle when deployed. It is configured to be openable to the vehicle interior side I (see FIGS. 2, 7, and 8).

  The inflator 14 supplies inflation gas to the airbag 20, and as shown in FIG. 1, as a substantially cylindrical cylinder type, a gas discharge port (not shown) capable of discharging inflation gas is provided on the tip side. It is arranged. The inflator 14 inserts the distal end side including the vicinity of the gas discharge port into a connection port portion 26 described later of the airbag 20, and uses the clamp 15 disposed on the outer peripheral side of the connection port portion 26, to the airbag 20. Are connected to each other. The inflator 14 is above the window W2 in the inner panel 2 by using a mounting bracket 16 for holding the inflator 14 and a bolt 17 for mounting the mounting bracket 16 to the inner panel 2 on the body 1 side. In place (see FIG. 1). The inflator 14 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown), and the control device performs a side collision or oblique projection (including oblique collision and offset collision) of the vehicle V, When a rollover is detected, an operation signal is input from the control device to operate.

  Each mounting bracket 11 is composed of two sheet metal plates, and is attached to each mounting portion 42, 55a so that mounting portions 42, 55a (to be described later) of the airbag 20 are sandwiched from the front and back, and mounting bolts 12, the mounting portions 42 and 55a are fixedly mounted on the inner panel 2 on the body 1 side.

  As shown in FIGS. 3 to 5, the airbag 20 includes a bag main body 21 and sheet bodies 60 </ b> F and 60 </ b> R disposed on the side of the inner wall of the bag main body 21.

  As shown in the two-dot chain line of FIG. 1 and FIG. 6, the bag main body 21 flows in the inflation gas from the inflator 14 and expands it from the folded state, so that the windows W1, W2 and the windows W1, W2 It is set as the structure expand | swelled so that the vehicle inside of the center pillar garnish 6 of center pillar part CP arrange | positioned between may be covered.

  In the case of the embodiment, the bag body 21 is manufactured by bag weaving using polyamide yarn, polyester yarn, or the like, and a coated cloth in which a coating agent made of a silicone resin for preventing gas leakage is applied to the outer surface side. Is formed from. Specifically, the bag body 21 has a coating layer 21c on which the coating agent is applied over the entire outer surface side (see FIGS. 3 to 5). The coated cloth in which the coating layer is formed by applying the coating agent has a higher frictional resistance on the outer surface provided with the coating layer than the non-coated cloth without the coating layer. Further, as shown in FIGS. 3 to 5, the bag body 21 is inflated inside so as to separate the vehicle interior side wall portion 22 a located on the vehicle interior side I and the vehicle exterior wall portion 22 b located on the vehicle exterior side O when the inflation is completed. The gas inflow part 22 which expands by making the gas G flow inflow, and the non-inflow part 39 which does not flow in the gas for expansion are comprised.

  Further, the bag body 21 is configured to be able to protect the occupant's head even when the vehicle V rolls over. Specifically, in the case of the embodiment, as shown in FIGS. 22 is a main inflating portion 24 (primary inflating portion) that inflates by inflating the inflation gas discharged from the inflator 14, and a front side that communicates with the main inflating portion 24 and completes the expansion after the main inflating portion 24 has been inflated. Sub-expansion part 30, central side sub-expansion part 31, rear side sub-expansion part 32 (secondary expansion part), main expansion part 24 and front side sub-expansion part 30, center side sub-expansion part 31, rear side sub-expansion part 32 And communication portions 34, 35, 36, and 37 that communicate with each other.

  The main expansion part 24 includes a gas guide channel 25, a connection port part 26, a front seat protection part 27, and a rear seat protection part 28.

  The gas guide channel 25 is disposed over substantially the entire region before and after the region of the main inflating portion 24 so as to extend substantially along the front-rear direction on the upper edge 21 a side of the bag body 21, and is discharged from the inflator 14. The inflating gas G is guided to the front seat protection part 27 and the rear seat protection part 28 arranged below the gas guide channel 25. In the case of the embodiment, the connection port portion 26 connected to the inflator 14 is a gas at a position slightly shifted forward from the front and rear center of the gas guide channel 25 (position that is substantially the front and rear of the bag body 21). It communicates with the guide channel 25 and is disposed so as to protrude upward from the gas guide channel 25. In the case of the embodiment, the connection port portion 26 is formed so as to be inclined rearward with respect to the gas guide channel 25, and the rear end 26a side is opened so that the inflator 14 can be inserted. And the connection port part 26 will be connected with the inflator 14 by fitting the clamp 15 in the outer peripheral side in the state which inserted the inflator 14 inside. In addition, in the bag main body 21 of the embodiment, a separate inner tube (not shown in the figure) for improving heat resistance is provided in a portion from the connection port portion 26 to the gas guide channel 25 immediately below the connection port portion 26. (See FIGS. 3 and 5).

  As shown in FIG. 6, the front seat protection unit 27 is disposed on the side of the front seat when the inflation is completed, and is seated on the front seat when the bag body 21 completes the inflation in a side collision. This is a part for protecting the head of the occupant. The rear seat protection portion 28 is disposed on the side of the rear seat when the inflation is completed, and protects the head of the passenger seated in the rear seat when the bag body 21 completes the inflation in a side collision. It is a part to do.

  The front side sub-inflation part 30 is disposed close to a position on the front side (vehicle front side) of the occupant in the main inflation part 24 (front seat protection part 27) when the bag body 21 is inflated. . In the case of the embodiment, the front sub-inflatable portion 30 is disposed on the front end side of the bag body 21 so as to be adjacent to the front side of the main inflatable portion 24 (front seat protection portion 27). In the case of the embodiment, the front side sub-expansion portion 30 is configured to project the lower end 30a side downward from the belt line BL when expansion is completed (see FIG. 6). The front sub-expansion part 30 is communicated with the front seat protection part 27 by a communication part 34 opened to the rear upper end side and a communication part 35 opened to the rear lower end side. These communication portions 34 and 35 are configured so that the opening width dimension is set small, and the start of the inflow of the inflation gas into the front side secondary inflation portion 30 is delayed from the front seat protection portion 27.

  In the case of the embodiment, the central side sub-inflating part 31 is located on the main inflating part 24 on the rear side of the front seat protecting part 27 and on the lower side of the gas guiding channel 25 so as to be arranged in the main inflating part. The portion 24 is disposed adjacent to the front seat protection portion 27. In the case of the embodiment, the center side sub-inflating portion 31 is communicated with the front seat protection portion 27 by a communication portion 36 opened to the rear end side of the front seat protection portion 27. The communication portion 36 is also set to have a small opening width dimension, and is configured to delay the start of the flow of the inflation gas into the central side secondary inflation portion 31 as compared to the front seat protection portion 27.

  The rear side sub-inflation part 32 is disposed close to a position on the front side (vehicle front side) of the occupant in the main inflation part 24 (rear seat protection part 28) when the bag body 21 is inflated. Yes. In the case of the embodiment, the rear side sub-expansion portion 32 is arranged so as to fill a lower region of the gas guide channel 25 between the center side sub-expansion portion 31 and the rear seat protection portion 28. The main inflating part 24 (rear seat protection part 28) is disposed adjacent to the front side. In the case of the embodiment, the rear sub-expansion portion 32 is communicated with the rear seat protection portion 28 by a communication portion 37 that is opened on the front end side of the rear seat protection portion 28. The communication portion 37 is also set to have a small opening width dimension, and is configured to delay the start of inflow of the inflation gas into the rear sub-expansion portion 32 relative to the rear seat protection portion 28.

  As shown in FIGS. 3 and 5, the non-inflow portion 39 is connected to the peripheral portion 40, the attachment portion 42, the partition portions 44, 45, 46, and the thickness regulating portions 48, 49, 50, 51, 52. Belt 55.

  The peripheral edge portion 40 constitutes the outer peripheral edge of the gas inflow portion 22, and is disposed so as to surround the periphery of the gas inflow portion 22 over the entire circumference except for the rear end 26 a side of the connection port portion 26.

  The attachment portion 42 is a portion for attaching the airbag 20 (bag main body 21) to the inner panel 2 on the body 1 side, and as shown in FIGS. 3 and 5, the peripheral portion on the upper edge 21a side of the bag main body 21 A plurality are arranged along the front-rear direction so as to protrude upward from the upper edge side portion 40 a of 40. In the case of the embodiment, five mounting portions 42 are arranged. Each mounting portion 42 is formed with a mounting hole (not shown) through which the mounting bolt 12 can be inserted.

  The partition parts 44, 45, 46 and the thickness regulating parts 48, 49, 50, 51, 52 are arranged in the region of the gas inflow part 22.

  The partition portion 44 is configured as a substantially rod shape that extends substantially along the vertical direction while separating the upper and lower end sides from the peripheral edge portion 40 so as to partition the front sub-inflatable portion 30 and the front seat protection portion 27. ing. This partition part 44 is formed so that the terminal part 44a on the upper end side protrudes upward from a partition part 46 described later. The partition 45 is arranged in a substantially bar shape extending upward from the lower edge portion 40b of the peripheral edge 40 so as to partition the center side sub-expansion portion 31 and the rear side sub-expansion portion 32. The partition 46 constitutes the lower edge side of the gas guide channel 25, and the upper end of the partition 45 so as to partition the center side sub-expansion unit 31 and the rear side sub-expansion unit 32 from the gas guide channel 25. It is formed so as to extend from front to back. On the front end side of the partition portion 46, the front seat protection portion 27 and the center side sub-expansion portion 31 are partitioned and bent while curving downward so as to regulate the thickness of this region. A curved section 46a is formed.

  The thickness restricting portion 48 is arranged in a position near the front end of the gas guide flow path 25 and behind the communicating portion 34 with the outer shape being a flat, substantially U-shape. The thickness regulating portion 48 suppresses a large amount of inflation gas from flowing to the communication portion 34 side (front side secondary inflation portion 30 side) when the main inflation portion 24 is inflated, and is integrated with the gas guide channel 25. This is arranged in order to prevent the front upper portion of the front seat protecting portion 27 that is configured to expand thickly. The thickness regulating portion 49 has a substantially inverted J shape on the lower edge side of the front seat protecting portion 27 so as to protrude forward from the lower edge side portion 40b of the peripheral edge portion 40 while inclining forward. Is formed. The thickness restricting portion 50 is formed so as to protrude upward from the lower edge side portion 40 b of the peripheral edge portion 40 on the lower edge side of the center side auxiliary expansion portion 31. The thickness restricting portion 51 is formed so as to protrude upward from the lower edge side portion 40 b of the peripheral edge portion 40 in the vicinity of the boundary portion between the rear side sub-inflatable portion 32 and the rear seat protecting portion 28. The thickness restricting portion 52 is disposed at a position on the rear side of the partitioning portion 46 in the region of the rear seat protecting portion 28. The outer shape is a flat, substantially inverted V shape, and the upper end is These are arranged so as to protrude above the partition 46.

  And in the bag main body 21 of embodiment, the clearance gap between the division part 44 and the upper edge side site | part 40a of the peripheral part 40 comprises the communication part 34, and the partition part 44 and the lower edge side site | part 40b of the peripheral part 40 are between. The gap between them constitutes the communication part 35. In addition, the gap between the curved partition part 46 a and the thickness regulating part 49 in the partition part 46 constitutes the communication part 36, and the gap between the rear end side part of the partition part 46 and the thickness regulating part 51. However, the communication part 37 is comprised.

  The connecting belt 55 is disposed separately from the bag body 21 and extends substantially along the front-rear direction on the front end side of the bag body 21. Specifically, the connecting belt 55 is formed so as to extend forward from a position slightly above the upper and lower centers of the bag body 21, and is attached to the inner panel 2 of the front pillar portion FP on the front end side. A mounting portion 55a is formed. An attachment hole (not shown) that allows the attachment bolt 12 to be inserted is formed in the attachment portion 55a.

  In the case of the embodiment, the seat bodies 60F and 60R are arranged at two locations so as to cover the inner side surface of the front seat protecting portion 27 and the inner side surface of the rear seat protecting portion 28. In the case of the embodiment, each sheet body 60F, 60R is formed from a non-coated cloth in which a coating agent is not applied to the outer surface side of a woven cloth made of polyester yarn, polyamide yarn, etc. The frictional resistance of the bag body 21 in which the coating layer 21c is disposed is set to be smaller. That is, in the airbag 20 of the embodiment, the front side secondary inflating portion 30 disposed on the front side of the front seat protecting portion 27 as the main inflating portion 24 and the central side side inflating disposed on the front side of the rear seat protecting portion 28. The expansion portion 31 and the rear side sub-expansion portion 32 are configured to have a coating layer 21c on the outer surface, and the friction resistance of the vehicle inner side surface (the surface of the vehicle inner wall portion 22a) at the completion of the expansion is determined by the vehicle inner side surface (the vehicle inner side wall). (The surface of the portion 22a) is set to be larger than the frictional resistance of the vehicle interior side surfaces (surfaces of the seat bodies 60F and 60R) of the front seat protection portion 27 and the rear seat protection portion 28 covered with the seat bodies 60F and 60R.

  Specifically, the seat body 60 </ b> F disposed on the front side can cover the vehicle interior of the front seat protection portion 27 and the portion disposed on the upper side of the front seat protection portion 27 in the gas guide channel 25. The outer shape is configured as a substantially rectangular shape. The seat body 60 </ b> R disposed on the rear side has an outer shape so as to be able to cover the inner side of the rear seat protection portion 28 and the portion disposed on the upper side of the rear seat protection portion 28 in the gas guide channel 25. Is configured as a substantially rectangular shape. Each of the sheet bodies 60F and 60R is overlapped on the vehicle interior side wall portion 22a of the bag body 21 that is flatly spread, and the upper edge 60a and the lower edge 60b are respectively placed on the upper edge 21a side and the lower edge of the bag body 21. The upper edge side portion 40a and the lower edge side portion 40b of the peripheral edge portion 40 on the 21b side are attached to the vehicle inner side surface side of the bag body 21 by sewing using a suture thread over substantially the entire front and rear regions (FIG. 3 and 4). In the case of the embodiment, the width dimension on the vertical direction side of each sheet body 60F, 60R is configured to be substantially the same as the width dimension on the vertical direction side of the bag body 21 in a flatly unfolded state.

  Next, mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. First, the bag body 21 in a state where the vehicle inner wall portion 22a and the vehicle outer wall portion 22b are overlapped and flattened together with the sheet bodies 60F and 60R, the lower edge 21b side approaches the upper edge 21a side, and the vertical direction Fold it to reduce the width dimension. Specifically, in the embodiment, the airbag 20 accordionally folds a portion of the gas guide channel 25 which is a region on the upper edge 21a side of the bag body 21 with a plurality of folds along the front-rear direction. At the same time, the portion of the bag body 21 that is below the gas guide channel 25 is folded by being rolled so that the lower edge 21b side is wound toward the outside of the vehicle. In other words, the roll folding part 64 of the folding completion body 63 formed by folding the airbag 20 is different from the sheet bodies 60F and 60R arranged on the vehicle interior side when the sheet bodies 60F and 60R are arranged. It will be folded so that it may be exposed to (refer FIG. 2). After the folding of the airbag 20 is completed, a predetermined portion of the airbag 20 is wrapped with a wrapping material (not shown) that can be broken to prevent it from collapsing.

  Thereafter, the inflator 14 to which the mounting bracket 16 has been attached is connected to the connection port portion 26 of the airbag 20 using the clamp 15, and the mounting bracket 11 is fixed to each of the mounting portions 42 and 55 a. An assembly is formed.

  Next, the mounting brackets 11 and 16 are arranged at predetermined positions on the inner panel 2 on the body 1 side, and are fastened with bolts 12 and 17. A lead wire (not shown) extending from a predetermined control device for operating the inflator is attached to the inflator 14. Connect the front pillar garnish 4 and roof head lining 5 to the inner panel 2 on the body 1 side, and attach the pillar garnishes 6 and 7 to the inner panel 2 on the body 1 side. It can be mounted on the vehicle V.

  After the head protection airbag device M is mounted on the vehicle V, if the inflator 14 is activated in response to an operation signal from the control device at the time of side collision, oblique collision, or rollover of the vehicle V, The inflating gas discharged from the inflator 14 flows into the bag body 21, and the expanding bag body 21 breaks a wrapping material (not shown), and further lower edges of the front pillar garnish 4 and the roof head lining 5. As shown in the two-dot chain line in FIG. 1 and in FIG. 6, the airbag cover 9 comprising the air bag cover 9 is opened and greatly expanded so as to cover the windows W1, W2 and the inside of the center pillar portion CP. Will be. In the airbag 20 (bag body 21) of the embodiment, first, the main inflating portion 24 (the front seat protecting portion 27, the rear seat protecting portion 28) completes the inflating, and then the front side inflating portion 30 is reached. , The center side sub-expansion portion 31 and the rear side sub-expansion portion 32 complete the expansion.

  In the head protection airbag device M according to the embodiment, the main inflating portion 24 (the front seat protecting portion 27 and the rear seat protecting portion 28) disposed on the side of the head seated on the seat when the inflation is completed is provided. The frictional resistance of the inner side surface of the vehicle when the expansion is completed is set to be smaller than the frictional resistance of the inner side surface (the inner side wall portion 22a) of the front side subexpanding portion 30, the central side subexpanding portion 31, and the rear side subexpanding portion 32. Therefore, as shown in FIG. 8, when the occupant MP deploys and inflates the airbag 20 with the head H close to the window W1, the main inflating portion 24 (the front seat protecting portion 27) to be deployed. Even if the head is in contact with the head H, the head H is restrained from being caught, and the head H can be deployed. Therefore, the main inflating portion 24 (the front seat protection portion 27 and the rear seat protection portion 28) can cover the inside of the windows W1 and W2 while suppressing the strong pressing of the head H. In particular, in the head protection airbag device M of the embodiment, the airbag 20 is folded by roll folding so that the lower edge 21b is wound toward the vehicle outer side O. In other words, the main inflating portion 24 is Since the vehicle interior side surface (in the case of the embodiment, the sheet members 60F and 60R) is folded so as to be exposed to the outside, as shown in FIG. Even if it comes into contact with the part H, the vehicle interior side surface (sheet body 60F) can be reliably brought into contact with the head H, and can be smoothly deployed so as to pass through the head H.

  Further, as shown in FIG. 7, when the occupant MP moves obliquely forward on the outer side O, the main inflating portion that contacts the head H that moves obliquely forward on the outer side O as shown in FIG. 24 (front seat protection portion 27) is set to have a small frictional resistance, so that the head H can be prevented from being caught and the head H can be slid. The head H can be smoothly received by the main inflating part 24 (the front seat protecting part 27) in a state in which the turning toward the head is suppressed.

  Therefore, in the head protection airbag device M of the embodiment, the head H of the occupant MP can be smoothly protected even when the occupant MP is close to the head J or at the time of oblique collision.

  In the head protection airbag device M of the embodiment, the front side sub-inflation part 30, the center side sub-inflation part 31, and the rear side sub-inflation part 32 are set to have a large frictional resistance on the vehicle inner side surface (vehicle inner side wall part 22a). Therefore, when the vehicle V rolls over, when receiving the head H of the occupant MP, the downward movement of the head H can be suppressed and the head H can be accurately received. Can be suppressed.

  Specifically, in the head protection airbag apparatus M of the embodiment, the airbag 20 is formed of a bag body 21 formed from a coated cloth in which a coating agent is applied to the outer surface side, and a sheet formed from a non-coated cloth. Body 60F, 60R, and the seat body 60F, 60R is attached to the vehicle interior side of the main inflating portion 24 (the front seat protection portion 27, the rear seat protection portion 28), thereby friction between them. In this configuration, the resistance is different. That is, in the head protection airbag device M of the embodiment, the entire bag body 21 is formed of a coated cloth having a coating agent applied to the outer surface side, so that it is easy to maintain the overall internal pressure when the inflation is completed. Even when the vehicle V rolls over, the head H of the occupant MP can be more accurately protected by the bag body 21 in which the internal pressure is maintained. Further, by attaching sheet bodies 60F, 60R formed of non-coated cloth to the inner side surface of the main inflating portion 24 (front seat protecting portion 27, rear seat protecting portion 28), the main inflating portion 24 (for front seat) Since the protection portion 27 and the rear seat protection portion 28) can be set lower in friction resistance than the front side sub-expansion portion 30, the center side sub-expansion portion 31, and the rear side sub-expansion portion 32, the configuration is simple. The airbag 20 can be easily manufactured. If such a point is not taken into account, for example, the coating agent is not applied to the region of the inner side surface of the main expansion portion, and the coating agent is applied to the remaining region, so that the main expansion portion and the sub-expansion portion It is good also as a structure which makes the frictional resistance of the vehicle inner surface side differ.

  Furthermore, in the head protection airbag device M of the embodiment, the sheet body 60F, 60R is attached to the bag body 21 by coupling the upper edge 60a side and the lower edge 60b side to the bag body 21 when the inflation is completed. It is attached. Therefore, in the head protection airbag device M of the embodiment, the sheet bodies 60F and 60R can be shifted up and down with respect to the bag body 21 at the upper and lower intermediate portions. When the head H of the occupant MP close to W1 is contacted or when the head H of the occupant MP is received in the case of an oblique collision, the head H contacts the seat body 60F as shown in FIGS. Therefore, the seat bodies 60F and 60R that have received the head can be displaced with respect to the bag body 21, in other words, the seat bodies 60F and 60R themselves are brought into contact with the occupant's head. In this state, the bag body 21 can be smoothly deployed while being shifted downward relative to the seat bodies 60F and 60R, and the pressing of the head of the occupant is suppressed more accurately. It can be. In particular, since the sheet bodies 60F and 60R are formed from a non-coated cloth and the friction resistance between the front and back surfaces is set to be smaller than that of the bag body 21, the bag body 21 can be easily displaced.

  In the embodiment, the occupant is seated on the seat so as to face the traveling direction side of the vehicle, and the front side sub-expansion portion, the center side sub-expansion portion, and the rear side sub-expansion portion are the main expansion portion (front It is the structure arrange | positioned in the vehicle front side of the protection part for seats, and the protection part for rear seats). However, the head protection airbag device of the present invention is not limited to this, and can be applied to, for example, a vehicle in which an occupant is seated on a seat so as to face the traveling direction of the vehicle. When mounted on such a vehicle, the sub inflating portion is disposed on the vehicle rear side of the main inflating portion (the front side of the occupant seated in the seat).

  DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Inner panel, 9 ... Air bag cover, 14 ... Inflator, 20 ... Air bag, 21 ... Bag main body, 21c ... Coating layer, 24 ... Main inflating part, 27 ... Front seat protection part, 28 ... Rear seat protection section, 30 ... front side sub-expansion section, 31 ... center side sub-expansion section, 32 ... rear side sub-expansion section, 60F, 60R ... sheet body, W1, W2 ... window, V ... vehicle, M ... head Protective airbag device.

Claims (4)

The window is folded and stored on the upper edge side of the window inside the vehicle, and the upper edge side is attached and fixed to the body side of the vehicle so that the inflation gas from the inflator flows in and protrudes downward from the storage part. A head protection airbag device configured to include an airbag that is inflated so as to cover the inside of the vehicle,
The airbag is
A main inflating part which is disposed on the side of the head of the occupant seated on the seat when the inflating is completed and protects the head;
A sub-expansion part that is arranged close to a position on the front side of the occupant in the main inflating part when the inflating is completed and communicates with the main inflating part to complete the inflating after the inflating of the main inflating part; ,
It is set as the composition provided with
The head-protecting air, wherein the sub-expansion portion has a friction resistance of at least a vehicle inner surface at the time of completion of expansion set to be greater than a friction resistance of at least the vehicle inner surface at the time of completion of expansion of the main expansion portion. Bag device.   2. The head protection according to claim 1, wherein a sheet body having a frictional resistance set smaller than that of the sub-expansion portion is attached to the inner inflating side of the main expansion portion when the expansion is completed. Airbag device.   The said airbag is comprised including the bag main body formed from the coated cloth which apply | coated the coating agent to the outer surface side, and the said sheet | seat body formed from a non-coated cloth. 2. The head protection airbag device according to 2. The head protection airbag device according to claim 2 or 3, wherein the sheet body is coupled to the bag body at an upper edge side and a lower edge side when the inflation is completed.