JP2008037261A - Vehicle seat with side airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To completely deploy a side airbag covering a wide range from a chest part to a waist part etc. of an occupant for a short time. <P>SOLUTION: A side airbag device 20 is arranged inside a door side side part 14B of a seat back 14, and two types of stay clothes that are a first inner stay cloth 52, a first outer stay cloth 54 and a second stay cloth 70 are arranged in the periphery of the side airbag device 20. The second stay cloth 70 is longer than the first inner stay cloth 52 and the first outer stay cloth 54 and is arranged in the oblique upper direction in side view. A tip part 70C of the second stay cloth 70 is overlapped with a tip part 54C of the first outer stay cloth 54. Therefore, when an inflator 72 is operated and gas is blown out from a gas blowout part 74, first a rupture projected line is ruptured by the first inner stay cloth 52 and the first outer stay cloth 54, and then, the rupture projected line is promptly ruptured downwardly by the second stay cloth 70. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat including a side airbag device that inflates and deploys a side airbag between an occupant's upper body and a side door by operation of a gas generating means.

Patent Document 1 below discloses an example of a vehicle seat provided with a conventional side airbag device. Briefly described, in this prior art, a side airbag device is disposed inside a door side portion of a seat back of a vehicle seat. The trim cover that covers the side portion of the seat back is composed of a front surface portion and a side surface portion, and a broken portion is set at the boundary between the two. Furthermore, a stretchable cloth that is formed in a substantially trapezoidal shape is disposed on the inner side of the front surface portion and the inner side surface of the trim cover. Then, by co-sewing both short side portions with the break portion, the expansion pressure when the bag is unfolded acts on the break portion via a pair of webbings.
JP 2003-252163 A

  However, according to the configuration disclosed in the above prior art, there is room for improvement in the points described below.

  That is, in recent years, there is a demand to cover not only the chest but also a wide range of, for example, a portion from the chest to the waist, by the side airbag at the time of a side collision. In this case, the size of the side airbag is increased. However, when the breaking structure as in the prior art is applied to a vehicle seat equipped with a large side airbag, the bag inflation pressure after breaking the suture thread at the initial stage of deployment is insufficient, and the breaking part is set. It may be difficult to break quickly over the entire range. That is, it may take time from the start of deployment of the side airbag to the completion of deployment. Such a phenomenon can also occur when a material that is easily stretched is used for the trim cover.

  In view of the above facts, the present invention has an object to obtain a vehicle seat including a side airbag device capable of completely deploying a side airbag covering a wide range from the occupant's chest to the waist and the like in a short time. is there.

  A vehicle seat provided with a side airbag device according to the invention of claim 1 is provided in a door side side portion of a seat back and generates gas by operating and generated from the gas generating means. A side airbag device configured to include a side airbag that is inflated and deployed by gas, a front side skin and a side side skin that cover the door side side portion of the seat back and are located on the bag deployment direction side, and end portions of both A seat back epidermis that includes a to-be-scheduled portion that is sewn with a suture that is torn by a load input greater than or equal to a predetermined value, and a front end skin and an inner side surface of the side side epidermis having a fixed end on the seat back frame A first baffle that extends along each of the belts and has a free end fixed to the portion to be broken, and a fixed end on the seat back frame side, It extends along the inner surface of at least one of the skin and the side skin, and is positioned adjacent to or adjacent to the seat back height direction or partially overlaps with the fixed portion of the planned breakage portion with the free end of the first force cloth A second webbing having a free end fixed at the position, and the second webbing is longer than the first webbing and has a slack.

  According to a second aspect of the present invention, in the vehicle seat provided with the side airbag device according to the first aspect, the gas generating means is arranged with the vertical direction of the vehicle substantially in the longitudinal direction and a gas jet at one end in the longitudinal direction. A free end of the first force cloth is disposed on a gas outlet arrangement side of the gas generating means, and a free end of the second force cloth is on a gas outlet arrangement side of the gas generating means It is arrange | positioned on the opposite side.

  According to a third aspect of the present invention, in the vehicle seat provided with the side airbag device according to the second aspect, the free end of the first baffle is a direction in which the main flow of the gas ejected from the gas generating means is ejected. The free end of the second baffle is located at a position where the main flow of the gas ejected from the gas generating means is shifted to the downstream side of the main flow of the gas redirected in the side airbag. It is connected, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in the vehicle seat including the side airbag device according to any one of the first to third aspects, the free end of the second baffle is in the seat back height direction. It is formed in a substantially Y-shape that is branched, the free end of the first blanket is disposed between the bifurcated portions of the second blanket, and one and the other divided into two The length is different.

  According to the first aspect of the present invention, when gas is generated by the gas generating means, the side airbag of the side airbag device provided in the door side portion of the seat back is inflated. Therefore, the bag inflation pressure has a fixed end on the seat back frame side and extends along the inner surface of the front side skin and the side side skin, and the free end is between the end portions of the front side skin and the side side skin. It acts on the first force cloth fixed to the planned breaking portion for sewing. As a result, the first webbing stretches and causes the expansion pressure to concentrate on the planned fracture portion. Thereby, the terminal part of the front side epidermis and the terminal part of the side side epidermis are pulled in a direction away from each other, and an opportunity to break the suture that sews the part to be ruptured (an opportunity to tear the part to be ruptured) Given. When the suture is broken, the portion to be broken is cleaved, and a part of the side airbag is inflated and deployed along the inside of the door (the side airbag starts to come out from the door side portion of the seat back).

  Thereafter, when the slack portion of the second webbing set longer than the first webbing is extended, tension is generated in the second webbing. The second force cloth has a fixed end on the seat back frame side, extends along the inner surface of at least one of the front side skin and the side side skin, and is connected to the free end of the first force cloth in the planned breaking portion. Since the free end is fixed at a position adjacent to or adjacent to the fixing portion in the seat back height direction, or at a partly overlapping position, the second force is The cloth takes over the tearing operation of the part to be broken by the first force cloth and gives an opportunity to cut the suture. Therefore, even if the side airbag is larger than the conventional one, there is no situation in which the portion to be broken cannot be torn during the deployment, and the side airbag is inflated and deployed along the door direction smoothly and quickly.

  In other words, according to the present invention, an opportunity to cut the suture thread at the planned breaking portion can be given in two stages. As a result, even if the side airbag is a large one that covers not only the chest of the occupant but also the waist and the like, the tearing operation of the planned fracture portion can be performed smoothly and quickly.

  According to the second aspect of the present invention, the gas generating means is disposed in the side part of the door side of the seat back so that the vehicle vertical direction is substantially the longitudinal direction, and has a gas outlet at one end in the longitudinal direction. ing.

  Here, in the present invention, the free end of the first force cloth is disposed on the gas outlet arrangement side of the gas generating means, and the free end of the second force cloth is disposed on the opposite side to the gas outlet arrangement side of the gas generating means. Since it has been arranged, it is possible to quickly apply the bag inflation pressure to the first baffle side that is close to the gas outlet, and then (at a different timing) the second baffle that is far from the gas outlet. The bag inflation pressure can be applied to the bag.

  In the third aspect of the present invention, the position of the free end of the first force cloth and the position of the free end of the second force cloth are determined in relation to the main flow direction of the gas ejected from the gas generating means. . According to this, since the free end of the first baffle is arranged in the direction in which the main flow of gas ejected from the gas generating means is ejected, the bag inflation pressure is quickly applied to the free end of the first baffle. Can be made. Accordingly, the stitched portion of the free end of the first baffle at the planned breaking portion is cleaved very quickly.

  Thereafter, the main flow of the gas ejected from the gas generating means is developed in the direction in the side airbag, but the free end of the second baffle is arranged downstream of the main flow of the gas after the direction deployment. The free end of the second force cloth is arranged on the bag deployment direction side after the direction deployment. Therefore, the tearing operation by the free end of the second force cloth can be efficiently advanced in the direction in which the side airbag is to be deployed.

  According to the fourth aspect of the present invention, when the gas is generated by the gas generating means, the side airbag of the side airbag device provided in the door side portion of the seat back is inflated. Therefore, the bag inflation pressure has a fixed end on the seat back frame side and extends along the inner surface of the front side skin and the side side skin, and the free end is between the end portions of the front side skin and the side side skin. It acts on the first force cloth fixed to the planned breaking portion for sewing. As a result, the first webbing stretches and causes the expansion pressure to concentrate on the planned fracture portion. Thereby, the terminal part of the front side epidermis and the terminal part of the side side epidermis are pulled in a direction away from each other, and an opportunity to break the suture that sews the part to be ruptured (an opportunity to tear the part to be ruptured) Given. When the suture thread is broken, the portion to be broken is cleaved, and a part of the side airbag is inflated and deployed along the door (the side airbag starts to come out from the door side portion of the seat back).

  Thereafter, when the slack of the shorter branch part of the branch part of the second force cloth set longer than the first force cloth is extended, tension is generated in the shorter branch part. As a result, a trigger for cutting the suture located on the shorter branch portion side is further provided continuously to the break portion of the planned break portion due to the first force cloth, and the shorter branch portion side is cleaved. proceed.

  Further, when the slack of the longer branch portion of the branch portions of the second force cloth is extended, tension is generated in the longer branch portion. As a result, a trigger for cutting the suture located on the longer branch portion side is further provided continuously to the break portion of the planned break portion by the first baffle, and the longer branch portion side is cleaved. proceed.

  That is, according to the present invention, an opportunity to cut the suture at the portion to be broken can be given in three stages. As a result, even if the side airbag is a large-sized one that covers not only the chest of the occupant but also the waist and the like, the breaking operation of the planned breaking portion can be performed more smoothly and quickly.

  As described above, the vehicle seat equipped with the side airbag device according to the first aspect of the present invention fully deploys the side airbag covering a wide range from the occupant's chest to the waist and the like in a short time. It has an excellent effect of being able to

  According to a second aspect of the present invention, there is provided a vehicle seat provided with the side airbag device according to the present invention, wherein the disposition position of the gas ejection port of the gas generating means and the disposition positions of the first baffle and the second baffle are related in perspective. Therefore, it has an excellent effect that the required characteristic for the shorter first bundling and the required characteristic for the longer second bundling can be realized with a simple configuration of “arrangement of gas generating means”.

  The vehicular seat provided with the side airbag device according to the present invention according to claim 3 can cause the second erection to cause a tearing operation that matches the inflated and deployed shape of the side airbag, resulting in an increase in size. It has an excellent effect that it can be quickly inflated and deployed regardless of the deployed shape of the side airbag.

  The vehicle seat provided with the side airbag device according to the present invention as set forth in claim 4 is excellent in that the side airbag covering a wide range from the chest to the waist of the occupant can be fully deployed in a shorter time. It has the effect.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle seat provided with a side airbag device according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 3 shows an overall perspective view of the vehicle seat equipped with the side airbag device according to the present embodiment in a side airbag deployed state. Further, FIG. 1 shows an enlarged side view of a main part when the seat back of the vehicle seat is viewed from the side of the seat. Further, FIG. 2 shows an enlarged plan view of a main part showing an enlarged peripheral structure of the seat back at the side airbag device arrangement portion.

  As shown in FIG. 3, the vehicle seat 10 includes a seat cushion 12 on which an occupant is seated, a seat back 14 that is supported on the rear end portion of the seat cushion 12 so as to be tiltable, and is used as a backrest of the occupant; The headrest 16 is configured to include a headrest 16 that is supported by the upper end portion of the seat back 14 so as to be movable up and down and supports the head of the occupant. Further, the seat back 14 is disposed at the center in the seat width direction and directly supports the occupant's back, and the door side side portion integrally provided at the outer end of the center 14A in the vehicle width direction. 14B and a tunnel side (inner side) side portion 14C provided integrally with an end portion on the inner side in the vehicle width direction of the central portion 14A. In addition, both the door side side part 14B and the tunnel side side part 14C have the shape which protruded to the vehicle front side.

  A side airbag device 20 for inflating and deploying the side airbag 18 to the front side of the seat along the inside of the side door (not shown) at the time of a side collision is provided in the intermediate portion in the height direction of the door side portion 14B described above. Yes. Hereinafter, the peripheral structure of the side airbag device 20 will be described in detail.

  As shown in FIG. 2, a seat back frame side portion 22 having a substantially L-shaped cross section formed by press molding is disposed along the seat back height direction at the approximate center of the door side side portion 14B. Has been. The seat back frame has a substantially U-shape with the lower part opened in a front view, and seat back frame side portions 22 are arranged on both sides of the seat back frame. The seat back frame side portion 22 includes a substantially flat base portion 22A extending along the vehicle front-rear direction, a bent portion 22B bent substantially perpendicularly from the rear end portion of the base portion 22A toward the vehicle width direction, and a base portion 22A. The arc portion 22C is bent in a substantially C shape from the front end portion to the inner side in the vehicle width direction.

  Around the base portion 22A and the circular arc portion 22C of the seat back frame side portion 22, a seat back pad side portion 24 having a substantially cross-sectional shape formed in an upside down shape is disposed. The seat back pad side portion 24 is made of urethane foam or the like having a predetermined hardness, and includes a pad side portion 24A having a predetermined thickness arranged linearly along the vehicle longitudinal direction, and a front portion of the pad side portion 24A. And a round-shaped pad front portion 24B extending to the seat back pad front portion 26 side. On the inner corner side where the pad side portion 24A and the pad front portion 24B intersect with each other, a concave groove 28 that cuts substantially toward the vehicle front side is formed. The recessed groove 28 serves as a starting point for breaking the seat back pad side portion 24 into the pad side portion 24A and the pad front portion 24B when the side airbag 18 is inflated and deployed.

  Furthermore, the seat side skin 30 is disposed outside the pad side portion 24A described above (outside in the vehicle width direction). In addition, a front side skin 32 is disposed outside the pad front portion 24B (the vehicle front side). The inner end portion 32A of the front side skin 32 is stitched with an outer end 34A of the front center side skin 34 that covers the front surface of the seat back pad front portion 26 and a first suture 36. A seat back pad board 38 that supports the seat back pad front portion 26 is disposed on the back side of the seat back pad front portion 26. Further, the outer end portion 32B of the front side skin 32 is stitched with a front end 30A of the seat side skin 30 and a second suture 40 described later.

  Further, the rear end portion 30B of the seat side side skin 30 is covered with an end portion 48A in the width direction of a seat back trim (seat back board) 48 formed in a two-layer structure by the base material 44 and the skin layer 46. Yes. The rear end portion 30B of the seat side skin 30 itself is locked by a locking means such as a hog ring that is locked to a wire (not shown) arranged in the seat back 14.

  A space 50 having a predetermined width is formed between the base portion 22A of the seat back frame side portion 22 and the pad side portion 24A of the seat back pad side portion 24. The space 50 has a substantially box-like shape. An assembled side airbag device 20 is provided. In general, the side airbag device 20 includes a case that forms the outer shell thereof, and the case is fixed and supported on a base portion 22A of the side portion 22 of the seat back frame.

  Here, a total of three webbings are arranged on the inner side of the above-described seat side side skin 30 and the inner side of the front side side skin 32, which will be described in detail below.

  As shown in FIGS. 1 and 2, a pair of left and right first inner webbings 52 and a first outer webbing 54 as a first webbing are disposed on the upper side of the side airbag device 20. . The first inner webbing 52 and the first outer webbing 54 are each formed in a band shape (formed in a strap shape), and unlike the seat back skins such as the seat side skin 30 and the front side skin 32, It is also configured to be difficult to stretch.

  The first inner webbing 52 and the first outer webbing 54 have fixed ends on the seat back frame side portion 22. Specifically, a support member 56 formed of a plate is fixed to the rear surface of the bent portion 22 </ b> B of the seat back frame side portion 22 with a bolt 58 and a cap nut 60. The support member 56 is provided with strength and rigidity that can support a reaction force when the side airbag 18 is inflated and deployed. In that sense, the support member 56 can be said to be an anchor plate for the first inner force cloth 52 and the first inner force cloth 54.

  An intermediate portion of the support member 56 is formed in a flat plate shape, and is used as a mounting seat for the bent portion 22B of the seat back frame side portion 22. The outer end portion of the support member 56 extends from the intermediate portion to the outside in the vehicle width direction, and the inner end portion of the support member 56 is bent obliquely from the intermediate portion to the vehicle front side. Further, a slit-like narrow locking hole 62 is formed in each of the outer end and the inner end of the support member 56, and the base end of the first inner force cloth 52 is formed in the locking hole 62. 52A and the base end portion 54A of the first outer webbing 54 are respectively inserted and fixed by sewing. In other words, since the positions of the fixing points of the first inner force cloth 52 and the first outer force cloth 54 are determined by the position of the locking hole 62, the positions are considered in consideration of the layout with the seat back pad side portion 24 and the like. The outer end portion and the inner end portion of the support member 56 are adjusted by the amount of protrusion and the bending angle.

  The intermediate portion 54B of the first outer webbing 54 extends to the vehicle front side along the inside of the seat side skin 30 and the front end portion 54C, which is a free end, is connected to the front end 30A of the seat side skin 30. It is sewn with 3 sutures 64 (refer to the attached drawing of FIG. 2). Similarly, the intermediate portion 52B of the first inner force cloth 52 extends from the base end portion 52A to the vehicle front side, and then extends along the inner side of the front side skin 32, and is a free end. The portion 52 </ b> C is sewn to the outer end portion 32 </ b> B of the seat side skin 30 with a third suture thread 64. An insertion passage 66 for inserting the intermediate portion 52B of the first inner webbing 52 is formed along the vehicle front-rear direction at a connection portion between the seat back pad front portion 26 and the seat back pad side portion 24. Yes.

  Then, the outer end portion 32B of the front side skin 32 and the front end portion 52C of the first inner webbing 52, the front end portion 30A of the seat side skin 30 and the front end 54C of the first outer webbing 54, each of which is overlapped with each other. However, it is sutured by the second suture thread 40 that breaks when a load of a predetermined value or more acts. A part of the line stitched by the second suture thread 40 (the range indicated by the arrow A in FIG. 3) is the planned fracture portion 42.

  As shown in FIG. 1, a second webbing 70 is further provided below the first outside webbing 54 described above. The second webbing 70 is longer in length than the first outer webbing 54 and the first inner webbing 52, and has the property of hardly extending like the first outer webbing 54 and the first inner webbing 52. is doing.

  A base end portion 70A, which is a fixed end of the second webbing 70, is set at a position offset to the vehicle lower side from the base end portion 54A of the first outer webbing 54. The attachment structure is the same as that of the first outer webbing 54, and a support member (not shown) for the second webbing 70 is attached to the bent portion 22B of the seat back frame side portion 22. The upper and lower support members may be connected to form a single part.

  The intermediate portion 70B of the second force cloth 70 is disposed inside the seat side skin 30 like the intermediate portion 54B of the first outer force cloth 54, but the routing route in the vehicle side view is from the fixed end to the front of the vehicle. It is routed diagonally upward. Furthermore, the front end portion 70 </ b> C, which is a free end of the second webbing 70, is partly stacked on the front end portion 54 </ b> C of the first outer webbing 54 and sewn downward. In this embodiment, the upper half of the distal end portion 70C of the second outer fabric 70 is arranged so as to overlap the lower half of the distal end portion 54C of the first outer webbing 54. Accordingly, the overlapped portion is sutured with the second suture thread 40 and the third suture thread 64 in a three-layered state.

  Further, in the side airbag device 20, an inflator 72 as a gas generating unit and a side airbag 18 that is inflated and deployed by gas ejected from the inflator 72 are disposed in a folded state. The side airbag 18 is large enough to cover the chest and waist of the occupant. Incidentally, as shown in FIG. 3, the upper portion 18A of the side airbag 18 that is inflated into a substantially polished shape in a side view is for protecting the chest of the occupant, and the lower portion 18B is for protecting the lumbar portion of the occupant.

  Returning to FIG. 1, the inflator 72 is formed in a substantially cylindrical shape, and is arranged with the seat back height direction as the longitudinal direction (arranged vertically). At the upper end portion of the inflator 72, a gas ejection portion 74 in which a gas ejection port is formed is provided. The front end portions 52C and 54C, which are the free ends of the first inner force cloth 52 and the first outer force cloth 54, are disposed at positions facing the gas ejection portion 74 in the vehicle front-rear direction. A second webbing 70 is disposed on the side opposite to the portion 74. Furthermore, in the case of this embodiment, it is the free ends of the first inner force cloth 52 and the first outer force cloth 54 on the main flow direction side (the arrow P direction side in FIG. 4B) of the gas ejected from the inflator 72. The tip portions 52C and 54C are arranged, and the second force is applied to the side where the gas abuts the inner surface of the base fabric of the side airbag 18 and turns to the vehicle lower side (arrow Q direction side in FIG. 4B). A distal end portion 70 </ b> C that is a free end of the cloth 70 is disposed.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  When a side collision occurs, a side collision state is detected by an airbag sensor (not shown), and the signal is input to the airbag ECU. The airbag ECU determines whether or not the side airbag device 20 should be operated based on the input signal. If it is determined that the airbag is activated, a predetermined current is supplied to the inflator 72. As a result, the inflator 72 is activated to generate gas, and the gas is ejected from the gas ejection port of the gas ejection part 74. As a result, the side airbag 18 stored in a folded state in the door side portion 14B of the seat back 14 is inflated.

  The bag inflation pressure of the side airbag 18 acts on the first outer force cloth 54 via the pad side portion 24A of the seat back pad side portion 24 and also acts on the first inner force cloth 52 via the pad front portion 24B. . In this process, stress concentration occurs in the concave groove 28 on the inner corner side of the connecting portion between the pad side portion 24A of the seat back pad side portion 24 and the pad front portion 24B, and the seat back pad side portion 24 is broken from the concave groove 28. It breaks over the planned portion 42.

  In the initial stage of expansion, the bag expansion pressure acts on the first outer force cloth 54 and the first inner force cloth 52 and pulls them in a direction to separate them from each other. 54 is set to be longer than 54, and the intermediate portion 70B functions as a slack portion, so that almost no tension is generated in the second webbing 70.

  Then, the second suturing in which the bag inflating pressure acting on the first inner force cloth 52 and the first outer force cloth 54 connects the tip portions 52C and 54C of the first inner force cloth 52 and the first outer force cloth 54 to each other. When the breaking load of the thread 40 is exceeded, the second suture thread 40 is broken, and the seat side side skin 30 and the front side side skin 32 are expanded in a direction away from each other. In other words, the first inner webbing 52 and the first outer webbing 54 give the rupture scheduled portion 42 a chance of tearing. Thereby, the fracture | rupture planned part 42 is cleaved from the site | part where the front-end | tip part 52C of the 1st inner side force cloth 52 and the front-end | tip part 54C of the 1st outer side force cloth 54 are sewn, and as FIG.4 (A) shows, Part of the side airbag 18 (upper 18A side) starts to bulge out from the door side portion 14B of the seat back 14.

  Thereafter, when the intermediate portion 70B of the second webbing 70 set longer than the first outer webbing 54 is fully extended (when the slack disappears), tension is generated in the second webbing 70. The second force cloth 70 has a base end portion 70 </ b> A, which is a fixed end, fixed to a support member (not shown) of the seat back frame side portion 22, and an intermediate portion 70 </ b> B obliquely upward on the vehicle front side inside the seat side side skin 30. Since the distal end portion 70C, which is a free end, is disposed on the lower side and partially overlaps the distal end portion 54C of the first outer force cloth 54 in the portion 42 to be broken, the first inner force cloth 52 and the first outer force cloth 54 rupture and break the expected portion 42, the second force cloth 70 takes over the breaking operation of the expected break portion 42 by the first outer force cloth 54 and the second suture 40. I will give the opportunity to cut the seat toward the lower side of the seat back. Accordingly, there is no situation in which the side airbag 18 cannot tear the planned fracture portion 42 in the middle of inflation and deployment, and the lower portion 18B of the side airbag 18 is smoothly broken as shown in FIG. 4B. To the lower end of the section A (see FIG. 3), the side airbag 18 is inflated and deployed inside the side door toward the vehicle front side. As a result, the amount of secondary collision load input to the occupant's chest and waist during a side collision can be reduced (moderated).

  That is, according to this embodiment, the opportunity to cut | disconnect the 2nd suture 40 of the to-be-rupture part 42 can be given to two steps. Supplementally, the trigger of the first stage is for providing a cleavage start point, and the trigger of the second stage is for inducing a chaining operation in a direction from which the side airbag 18 is desired to be deployed in a chain. is there.

  As a result of the above, in the vehicle seat 10 provided with the side airbag device according to the present embodiment, even if the side airbag 18 is a large one that covers not only the chest of the occupant but also the waist, 42 can be smoothly and quickly performed. As a result, according to the present embodiment, it is possible to completely deploy the side airbag 18 having a substantially polished shape that covers a wide range from the occupant's chest to the waist.

  Moreover, according to the vehicle seat 10 provided with the side airbag device according to the present embodiment, the inflator 72 is formed in a substantially cylindrical shape, and the gas ejection portion 74 is provided at one end portion in the longitudinal direction. The vehicle up-down direction is the longitudinal direction and is disposed in the door-side side portion 14B of the seat back 14. Further, the gas ejection portion 74 is provided at the distal end portion 52C of the first inner force cloth 52 and the distal end portion 54C of the first outer force cloth 54. Since the second webbing 70 is arranged opposite to the gas ejection part 74 of the inflator 72, the first outer webbing 54 and the first inner webbing 52 side that are close to the gas ejection part 74 are disposed. Then, the bag inflation pressure can be applied quickly, and then the bag inflation pressure can be applied to the second force cloth 70 located far from the gas ejection portion 74 (at a different timing). As a result, according to the present embodiment, the required characteristics for the shorter first inner webbing 52 and the first outer webbing 54 and the required characteristics for the longer second webbing 70 are simply referred to as “arrangement of the inflator 72”. It can be realized with a simple configuration.

  Furthermore, in the vehicle seat 10 including the side airbag device according to the present embodiment, the position of the distal end portion 54C of the first outer webbing 54 and the position of the distal end portion 70C that is the free end of the second webbing 70 are determined. Since it was determined in relation to the main flow direction of the gas ejected from the inflator 72, that is, the first inner force cloth 52 on the main flow direction side of the gas ejected from the inflator 72 (arrow P direction side in FIG. 4B). And the first outer webbing 54 on the side where the gas contacts the inner surface of the base fabric of the upper portion 18A of the side airbag 18 and turns to the vehicle lower side (arrow Q direction side in FIG. 4B). Since the distal end portion 70C of the second force cloth 70 is disposed, the bag inflation pressure can be quickly applied to the distal end portions 52C and 54C of the first inner force cloth 52 and the first outer force cloth 54. Therefore, the stitched portion between the tip end portion 52C of the first inner webbing 52 and the tip part 54C of the first outer webbing 54 in the planned fracture portion 42 can be cleaved very quickly. Further, since the distal end portion 70C, which is the free end of the second webbing 70, is disposed on the downstream side of the main flow of the gas after the direction change, the front end portion of the second webbing 70 in the direction in which the side airbag 18 is to be deployed. The cleavage operation by 70C can be efficiently advanced. As a result, according to this embodiment, it is possible to rapidly inflate and deploy whatever size the deployment shape of the enlarged side airbag 18 is.

[Variation of the first embodiment]
Next, variations of the above-described first embodiment will be described with reference to FIGS. 5 and 6. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  In the example shown in FIG. 5B, the inflator 72 is arranged so that the gas ejection part 74 is on the lower side. Correspondingly, the shorter first inner webbing 52 and the first outer webbing 54 are arranged on the lower side of the sheet, and the longer second webbing 70 is arranged on the upper side of the sheet. FIG. 5A shows the vehicle seat provided with the side airbag device according to the first embodiment described above for comparison, but the side airbag is simplified rather than substantially polished. This is illustrated as a side airbag 80.

  In this case, since the gas ejection direction is upside down with the first embodiment type shown in FIG. 5A, the direction of the main flow of the gas ejected from the gas ejection portion 72 of the inflator 72 is initially the P direction. After contacting the base fabric of the side airbag 80 on the vehicle front side, the vehicle is changed to the R direction (vehicle upper side). Accordingly, when it is necessary to open the side airbag 80 from the lower side of the vehicle to the upper side of the vehicle by opening the planned fracture portion 42 from the lower end to the upper end (first restraining the waist and then the chest) This is effective in the case of a constrained design.

  In the example shown in FIG. 6A, the side airbag 82 is used for chest protection. Other configurations, in particular, the arrangement of the first inner webbing 52, the first outer webbing 54, and the second webbing 70 are the same as those in the first embodiment.

  In the example shown in FIG. 6B, the side airbag 84 is a large airbag that inflates above the upper end of the seatback 14, the lower portion 84A is used for protecting the chest, and the upper portion 84B is the head. It is intended for protection of parts. In the side airbag 84, a partition wall 88 having a communication hole 86 communicating with the central portion at a position separating the lower portion 84A and the upper portion 84B is disposed. Other configurations, in particular, the arrangement of the first inner webbing 52, the first outer webbing 54, and the second webbing 70 are the same as in the example shown in FIG.

  In this case, by forming the partition wall 88, the lower portion 84A of the side airbag 84 corresponding to the chest is first inflated and deployed, and then the gas supplied into the lower portion 84A passes through the communication hole 86 (FIG. 6 ( B) this is indicated by the arrow S), and the upper part 84B is inflated and deployed.

[Second Embodiment]
Hereinafter, the second embodiment of the vehicle seat including the side airbag device according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7A, in the second embodiment, the second webbing 90 is formed in a substantially Y shape in a side view. Further, the length of one branching portion 90A divided into two is longer than that of the first inner force cloth 52 and the first outer force cloth 54, but is shorter than the length of the other branching portion 90B. Further, the distal end portion 54 </ b> C of the first outer webbing 54 is located in the middle between the one branch unit 90 </ b> A and the other branch unit 90 </ b> B of the second webbing 90.

(Action / Effect)
According to the above configuration, when the inflator 72 is actuated at the time of a side collision and gas is ejected toward the front side of the vehicle, first, the distal end portion 52C of the first inner force cloth 52 and the distal end of the first outer force cloth 54 Bag expansion pressure is applied to the portion 54C, and the portion to which the tip portions 52C and 54C are fixed is broken in the planned break portion 42 (not shown in FIG. 7, see FIG. 2). Thereby, a part of the side airbag 92 is inflated and deployed toward the vehicle front side inside the side door (the side airbag 92 starts to come out from the door side portion 14B of the seat back 14).

  Thereafter, the slack of one of the shorter branch portions 90A of the second inner cover 52 and the second outer cover 90 longer than the first outer cover 54 is extended, and the one shorter branch portion 90A is extended. Tension is generated. As a result, the second suture 40 (not shown in FIG. 7) is located on the shorter one branch portion 90A side following the breakage of the planned break portion 42 by the first inner force cloth 52 and the first outer force cloth 54. 2 (see FIG. 2) is further provided, and the cleavage proceeds toward the shorter one branch portion 90A (the vehicle upper side).

  Furthermore, when the slack of the other longer branch portion 90B of the second webbing 90 is fully extended, tension is generated in the longer second branch portion 90B. This further gives an opportunity to cut the second suture 40 located on the other branching portion 90B side of the longer side following the breakage of the breakable portion 42 by the first inner force cloth 52 and the first outer force cloth 54. As a result, the cleavage proceeds toward the other branch portion 90B side (the vehicle lower side).

  That is, according to the present embodiment, a trigger for cutting the second suture 40 of the planned fracture portion 42 can be given in three stages. As a result, even if the side airbag 92 is a large-sized one that covers not only the chest of the occupant but also the waist and the like, the breaking operation of the planned fracture portion 42 can be performed more smoothly and quickly. As a result, according to the present embodiment, the side airbag 92 that covers a wide range from the occupant's chest to the waist and the like can be fully deployed in a shorter time.

  The example shown in FIG. 7B shows the case where the inflator 72 is disposed upside down. In this regard, in this example, the first inner webbing 52 and the first outer webbing 54 are arranged so as to cross one short branch 90A of the second webbing 90, and the gas of the inflator 72 is disposed. The main flow from the ejection portion 74 is first directed to the vehicle front side (arrow P), and is changed to the vehicle upper side (arrow R) after contacting the inner surface of the base fabric of the side airbag 92. It has become. Note that an elliptical column-shaped partition 94 for rectifying the main flow of gas is disposed on the upper side of the side airbag 92 in FIG. 7B, and this partition 94 is provided as necessary. It is done.

[Supplementary explanation of the above embodiment]
Hereinafter, supplementary explanations of the above embodiment will be listed.

  (1) In each embodiment mentioned above, although the 2nd force cloth 70 and 90 was set only to the former side of the seat side side skin 30 and the front side skin 32, it is not restricted to this, Even if it sets only to the latter side It may be set to both. When set to both, a more reliable effect can be obtained.

  (2) In the first embodiment described above, the configuration in which the distal end portion 70C of the second webbing 70 is partially overlapped with the distal end portion 54C of the first outer webbing 54 is adopted. The distal end portion 70C of the second force cloth 70 may be disposed adjacent to the distal end portion 54C of the first outer force cloth 54, and the distal end portion 70C of the second force cloth 70 is disposed at the distal end portion 54C of the first outer force cloth 54. May be arranged close to (that is, slightly spaced apart from each other). The point is that the distal end portion of the second webbing 70 is within the range in which the effect of inducing the tearing operation in the direction in which the side airbag 18 is to be inflated and deployed is obtained starting from the fracture of the planned fracture portion 42 by the first outer webbing 54. 70C may be set.

It is a principal part expansion side view which shows the seat back of the vehicle seat provided with the side airbag apparatus which concerns on 1st Embodiment seeing from a seat side. FIG. 2 is an enlarged plan cross-sectional view of a main part of the seat back shown in FIG. 1 cut along the side airbag device (sectional view taken along line 2-2 in FIG. 1). 1 is an overall perspective view showing a vehicle seat equipped with a side airbag device according to a first embodiment in a side airbag deployed state. FIG. 2 is an operation explanatory view showing an inflating and deploying process of the side airbag shown in FIG. 1. FIG. 5A is an enlarged side view of a main part depicting a vehicle seat provided with the side airbag device according to the first embodiment shown in FIG. 1, according to a variation of the first embodiment, for comparison. (B) is a principal part expanded side view which shows the structure which arranged the inflator upside down. (A) is a principal part enlarged side view which shows the example at the time of making the side airbag into the conventional type for a chest protection, (B) is a variation of 1st Embodiment, (B) is a chest and a head. It is a principal part enlarged side view which shows the example at the time of setting it as a protective airbag. (A) is a principal part enlarged side view which shows the example which carried out the arrangement | positioning of the inflator similarly to the case of 1st Embodiment, and (B) is the example which made the inflator arrangement upside down in connection with 2nd Embodiment. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 14 Seat back 14B Door side side part 18 Side airbag 20 Side airbag apparatus 22 Seat back frame side part 30 Seat side side skin 30A Front end part (terminal part)
32 Front side skin (front side skin)
32B Outer end (terminal part)
40 Second suture 42 Planned break portion 52 First inner webbing (first webbing)
52A Base end (fixed end)
52C Tip (free end)
54 1st outer force cloth (first force cloth)
54A Base end (fixed end)
54C Tip (free end)
70 Second force cloth 70A Base end (fixed end)
70B Middle part (slack)
70C Tip (free end)
72 Inflator (gas generating means)
74 Gas ejection portion 80 Side airbag 82 Side airbag 84 Side airbag 90 Second buff 90A One branch portion 90B The other branch portion 92 Side airbag

Claims (4)

A side air bag device which is provided in a door side side portion of the seat back and includes a gas generating means for generating gas by operating and a side air bag which is inflated and deployed by the gas generated from the gas generating means; ,
Covers the door-side side portion of the seat back, and includes a front-side skin and side-side skin located on the bag deployment direction side, and a planned breakage portion that is sewn with a suture thread that breaks the terminal portions of each other by a load input of a predetermined value or more. A seat back epidermis composed of
A first baffle having a fixed end on the seat back frame side, extending along the front side skin and the inner side surface of the side side skin, and having the free end fixed to the planned break portion;
The seat back has a fixed end on the side of the seat back frame, and extends along the inner surface of at least one of the front side skin and the side side skin and seats back against the fixed portion of the first lining in the planned breakage portion. A second baffle with a free end fixed at a position adjacent to or close to the height direction or partially overlapping;
Have
Further, the vehicle seat having a side airbag device, wherein the second webbing is set longer than the first webbing and has a slack. The gas generating means is arranged with the vehicle vertical direction as a longitudinal direction and has a gas outlet at one end in the longitudinal direction. The free end of the first baffle is on the gas outlet arrangement side of the gas generating means. And the free end of the second baffle is arranged on the opposite side of the gas generating port arrangement side of the gas generating means,
A vehicle seat comprising the side airbag device according to claim 1. A free end of the first baffle is positioned in a direction in which a main flow of gas ejected from the gas generating means is ejected;
The free end of the second force cloth is connected at a position where the main flow of the gas ejected from the gas generating means is shifted to the downstream side of the main flow of the gas whose direction is changed in the side airbag.
A vehicle seat comprising the side airbag device according to claim 2. The free end of the second webbing is formed in a substantially Y shape branched in the seat back height direction,
The free end of the first force cloth is disposed between the bifurcated portions of the second force cloth, and the length differs between the one divided into the two force cloths and the other.
The vehicle seat provided with the side airbag apparatus as described in any one of Claims 1 thru | or 3 characterized by the above-mentioned.

Images