JP2023010442A - Vehicle seat having side airbag device mounted thereon - Google Patents

Abstract

To stabilize expanding development of a head chamber between shoulder belt and a passenger head even when a side airbag having the head chamber and a trunk chamber is composed of a single bag body.SOLUTION: A vehicle seat 10 comprises: a seat body 12 for binding a passenger P by using a three-point seat belt 32; a side air bag 42 which has a constricted part 42C between a head chamber 42A and a trunk chamber 42B, which is housed in the state of being folded along an upper end 16U from a lateral side 16L outside a seat back 16 in a vehicle width direction through a shoulder 16S, and which receives a gas from an inflator to expand and develop towards a lateral side of the passenger P; and a loop fabric 50 which is attached to a part located in the shoulder 16S on a seat back surface 24 and which binds the constricted part 42C to the shoulder 16S to expand and develop the head chamber 42A between the shoulder belt 32A and a head H.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle seat equipped with a side airbag device.

In the vehicle seat safety device disclosed in JP-A-2003-130002, the backrest of the vehicle seat has at least one lateral region and an upper region from which the headrest extends. A side airbag device with at least one inflator and a side airbag is mounted on the backrest. The side airbag has a chest section and a head section. When the inflator is activated, the head section inflates and deploys from the upper region of the backrest beside the headrest. The head section and chest section are formed by separate bladders and are connected via a tubular filling section or the like. As a result, the head section is configured to inflate and deploy while being displaced inward in the vehicle width direction (that is, toward the occupant's head) with respect to the chest section.

U.S. Pat. No. 8,469,395

In the prior art described above, the head section is inflated and deployed between the shoulder belt of the seat belt and the occupant's head, so the head section can quickly restrain the head. However, since the head section (head chamber) and the chest section (body chamber) are formed by separate bag bodies, the structure of the side airbag is complicated, and manufacturing is complicated. On the other hand, when a side airbag having a head chamber and a torso chamber is composed of a single bag body, the head chamber tries to inflate and deploy directly above the torso chamber. It is difficult to inflate and deploy the head chamber toward the head.

In view of the above facts, the present invention provides a head chamber between the shoulder belt and the occupant's head even if the side airbag having the head chamber and the torso chamber is composed of a single bag body. An object of the present invention is to obtain a vehicle seat equipped with a side airbag device capable of stabilizing inflation and deployment.

A vehicle side airbag device according to a first aspect includes a seat body that restrains an occupant using a three-point seat belt, an inflator that generates gas when a side collision of the vehicle is detected or predicted, It is composed of a single bag body, and is stored in a folded state along the upper end portion through the shoulder from the side portion on the vehicle width direction outer side of the seat back of the seat body, and is inflated to the side of the occupant when the gas is supplied. A side airbag that deploys and has a constricted portion between an upper head chamber and a lower torso chamber, and a portion of the skin of the seat back located at the shoulder or a separate cloth attached to the portion. and a loop portion for inflating and deploying the head chamber between the shoulder belt of the seat belt and the occupant's head by constraining the constricted portion to the shoulder when the seat belt is inflated and deployed. .

In the first mode, the occupant is restrained by the seat body using a three-point seat belt. An inflator releases gas when a vehicle side impact is detected or predicted. This gas is supplied to the side airbag that is stored in a folded state along the upper end of the seat body from the vehicle width direction outer side of the seat back of the seat body through the shoulder. As a result, the side airbag is inflated and deployed to the side of the occupant. This side airbag consists of a single bag body and has a constriction between an upper head chamber and a lower torso chamber. The constricted portion is bound to the shoulder by a portion of the skin of the seat back located at the shoulder or by a loop portion made of a separate cloth attached to the portion. This inflates and deploys the head chamber between the shoulder belt of the seat belt and the occupant's head. Thus, according to this aspect, even if the side airbag having the head chamber and the body chamber is composed of a single bag body, the head chamber between the shoulder belt and the occupant's head is The expansion and deployment of the can be stabilized.

In the vehicle side airbag device of a second aspect, in the first aspect, the skin of the seat back is provided with a tear seam extending from the side portion through the shoulder opening and along the upper end portion, and the loop portion are made of the separate fabric and are sewn to the outer skin on both sides via the tear seam in a cross section of the seat back viewed from the vehicle width direction.

In the second aspect, when the gas generated by the inflator is supplied to the side airbag, the inflation pressure of the side airbag is applied to the skin of the seat back. A tear seam is set in this skin from the side of the seat back through the shoulder and along the upper end. When the tear seam is cleaved by the inflation pressure, the side airbag is inflated and deployed to the outside of the seatback. A loop portion made of a different fabric from the skin is attached to the skin. The loop portions are sewn to the outer skin on both sides via the tear seams in a cross section of the seat back viewed in the vehicle width direction. This loop portion restrains the constricted portion of the side airbag to the shoulder of the seat back after the tear seam is torn. In this way, since the loop portion is made of a fabric different from the seat back cover, the degree of freedom in designing the loop portion is increased.

In the vehicle side airbag device of the third aspect, in the second aspect, the loop portion is formed longer than the portion of the outer skin that the loop portion faces.

In the third aspect, the loop portion made of a fabric separate from the seatback skin restrains the constricted portion of the side airbag to the shoulder of the seatback after the tear seam set in the seatback is torn. Since the loop portion is formed longer than the portion of the outer skin that the loop portion faces, it is possible to prevent or suppress the expansion of the constricted portion from being restricted by the loop portion. As a result, gas flows well in the side airbag via the constricted portion, which contributes to rapid inflation and deployment of the side airbag.

In the vehicle side airbag device of a fourth aspect, in the first aspect, the skin of the seat back is provided with a tear seam that is divided into the side portion and the upper end portion without passing through the shoulder, The loop portion is formed by a portion of the skin of the seat back located at the shoulder.

In the fourth aspect, when the gas generated by the inflator is supplied to the side airbag, the inflation pressure of the side airbag is applied to the skin of the seatback. A tear seam is set in the skin so as to be separated into a side portion and an upper end portion without passing through the shoulder of the seat back. When these tear seams are cleaved by the inflation pressure, the side airbag is inflated and deployed to the outside of the seatback. At this time, the loop portion formed by the portion of the skin located at the shoulder of the seat back restrains the constricted portion of the side airbag to the shoulder of the seat back. In this way, since the loop portion is formed by a part of the seat back skin, the loop portion can be formed in a simple configuration.

In the vehicle side airbag device of the fifth aspect, in the fourth aspect, the loop portion is made of a material that stretches more easily than other portions of the outer skin.

According to the fifth aspect, after the tear seams set separately at the side portion and the upper end portion of the seatback are torn, the loop portion formed of a part of the skin of the seatback extends over the constricted portion of the side airbag. on the shoulders of the Since the loop portion is made of a material that is more stretchable than other portions of the epidermis, it is possible to prevent or suppress the expansion of the constricted portion from being restricted by the loop portion. As a result, gas flows well in the side airbag via the constricted portion, which contributes to rapid inflation and deployment of the side airbag.

As described above, in the vehicle seat equipped with the side airbag device according to the present invention, even if the side airbag having the head chamber and the body chamber is composed of a single bag body, the shoulder belt and the occupant's head.

FIG. 4 is a front view showing a completed state of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 4 is a side view showing a completed state of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; It is a plane development view of a side airbag. FIG. 4 is an enlarged cross-sectional view showing an enlarged cut plane taken along line F4-F4 of FIG. 3; FIG. 3 is a front view showing a state before inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 6 is an enlarged cross-sectional view showing an enlarged cut surface along line F6-F6 of FIG. 5; FIG. 4 is a front view showing a completed state of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 8 is an enlarged cross-sectional view showing an enlarged cut surface along line F8-F8 of FIG. 7; FIG. 10 is a front view showing a state in which side airbags in a vehicle seat according to a first comparative example are in an initial stage of inflation and deployment; FIG. 10 is a front view showing a state in the middle stage of inflation and deployment of the side airbag in the vehicle seat according to the first comparative example; FIG. 10 is a front view showing a state in which the side airbag in the vehicle seat according to the first comparative example has been inflated and deployed. FIG. 4 is a front view showing the initial state of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 4 is a front view showing a state in the middle stage of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 4 is a front view showing a completed state of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 4 is a side view showing a completed state of inflation and deployment of the side airbag in the first embodiment; FIG. 11 is a schematic plan view showing a state in which the side airbag in the vehicle seat according to the second comparative example has been inflated and deployed; FIG. 4 is a schematic plan view showing a completed state of inflation and deployment of the side airbag in the vehicle seat according to the first embodiment; FIG. 11 is a front view showing a state before inflation and deployment of the side airbag in the vehicle seat according to the second embodiment; FIG. 19 is an enlarged cross-sectional view showing an enlarged cut plane along line F19-F19 of FIG. 18; FIG. 10 is a front view showing a state in which the side airbag in the vehicle seat according to the second embodiment has been inflated and deployed. FIG. 21 is an enlarged cross-sectional view showing an enlarged cut surface along line F21-F21 of FIG. 20;

<First embodiment>
A vehicle seat 10 (hereinafter simply referred to as "vehicle seat 10") equipped with a side airbag device according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 17. FIG. An arrow FR indicated appropriately in each figure indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow LH (OUT) indicates the left side of the vehicle (outward in the width direction of the vehicle). . In the following description, when simply using front-rear, left-right, and up-down directions, front-rear in the vehicle front-rear direction, left and right in the vehicle left-right direction (vehicle width direction), and up and down in the vehicle vertical direction will be indicated unless otherwise specified. . Further, in each drawing, some reference numerals may be omitted for the purpose of making the drawings easier to read.

As shown in FIGS. 1 and 2, a vehicle seat 10 according to the present embodiment includes a seat body 12 in which an occupant is restrained using a three-point seat belt (webbing) 32, and a side airbag device 40. and The vehicle seat 10 is, for example, a driver's seat of a left-hand drive vehicle or a passenger's seat of a right-hand drive vehicle, and is arranged on the left side of the vehicle interior. The longitudinal direction, lateral direction (width direction) and vertical direction of the vehicle seat 10 coincide with the longitudinal direction, lateral direction (width direction) and vertical direction of the vehicle. When the vehicle seat 10 is arranged on the right side of the vehicle interior, the configuration is bilaterally symmetrical to that of the present embodiment.

The seat body 12 includes a seat cushion 14 that supports the buttocks and thighs of the occupant P seated on the seat body 12, and a seat back 16 that is connected to the rear end of the seat cushion 14 and supports the back of the occupant P. , and a headrest 18 that is connected to the upper end of the seat back 16 and supports the head H of the occupant P.

1 and 2, a dummy P for collision test is seated on the seat body 12 instead of the actual passenger. This dummy P is, for example, the World Side Impact Dummy (WorldSID) AM50 (50th percentile of American adult males). The dummy P is seated on the seat body 12 by a seating method specified by the side impact test method. The longitudinal position of the seat body 12 with respect to the vehicle and the inclination angle of the seat back 16 with respect to the seat cushion 14 are adjusted to the reference set positions corresponding to the seating method described above. In this state, the front, rear, left, right, top, and bottom directions of the seat back 16 match the front, rear, left, right, top, and bottom directions of the vehicle.

The seat back 16 includes a seat back frame 20 (see FIGS. 6 and 8) which is a frame member, a seat back pad 22 (see FIGS. 6 and 8) covering the seat back frame 20, and the seat back pad 22. a covered seat back skin 24; The seat back frame 20 is made of metal or resin, for example, and the seat back pad 22 is made of foam such as urethane foam. The seatback cover 24 is constructed by sewing together a plurality of cover pieces made of, for example, cloth material (woven fabric), knit material (knitted fabric), synthetic leather, leather, or the like.

The seat belt 32 that restrains the occupant P to the seat body 12 constitutes a main part of the vehicle seat belt device 30 . As shown in FIG. 1 , one longitudinal end of the seat belt 32 is anchored to an anchor plate 34 fixed to the vehicle floor or the like on the vehicle width direction outer side (here, left side) of the seat body 12 . The other end portion (not shown) of the seat belt 32 is engaged with a winding shaft (not shown) of a retractor disposed under a B-pillar of the vehicle or the like. An intermediate portion (not shown) of the seat belt 32 is passed through a shoulder anchor (not shown) disposed at the upper portion of the B-pillar or the like and folded back.

A tongue plate 36 is slidably attached to a portion of the seat belt 32 between the shoulder anchor and the anchor plate 34 . The tongue plate 36 is connected to a buckle device 38 attached to the lower end portion of the seat body 12 or the like on the vehicle width direction inner side (right side in this case) of the seat body 12 . As a result, the occupant P wears the seat belt 32 . In this seat belt wearing state, the chest and abdomen of the occupant P are restrained by the shoulder belt 32</b>A, which is the part between the shoulder anchor and the tongue plate 36 of the seat belt 32 . In this seat belt wearing state, the waist of the occupant P is restrained by the lap belt 32B, which is a portion of the seat belt 32 between the tongue plate 36 and the anchor plate 34. As shown in FIG.

An inflator 44, which is a component of the side airbag device 40, is arranged on the lateral side portion 16L of the seat back 16 on the outside in the vehicle width direction. A side airbag 42, which is a component of the side airbag device 40, is arranged in a portion extending from the vehicle width direction outer side portion 16L of the seat back 16 to the upper end portion 16U via the shoulder 16S. As shown in FIGS. 3 and 4, the side airbag 42 is formed by stacking two base fabrics BC1 and BC2 formed by cutting out a nylon-based or polyester-based cloth material, for example. It is formed into a bag shape by being sewn at the sewing portion S1. Note that the method of manufacturing the side airbag 42 is not limited to the above, and can be changed as appropriate. For example, the side airbag 42 may be manufactured by folding a sheet of base cloth in two and sewing the outer peripheral edge of the base cloth. Alternatively, for example, the side airbag 42 may be manufactured by a tubular weaving method (so-called OPW method) using an automatic loom.

The side airbag 42 is constructed as a single bag body and has a long bag shape. One longitudinal end of the side airbag 42 is a head chamber 42A that restrains the head H of the occupant P, and the other longitudinal end of the side airbag 42 is a torso B of the occupant P (here, body chamber 42B that restrains the body (from the chest to the waist). A duct-shaped constricted portion (duct portion) 42C is formed between the head chamber 42A and the body chamber 42B. The side airbag 42 is constricted at a constricted portion 42C.

An inflator connecting portion 42</b>D extends from one long side edge portion of the side airbag 42 . An inflator 44 is connected to the inflator connection portion 42D. The inflator 44 is a so-called cylinder type inflator and is formed in a cylindrical shape. As shown in FIG. 2, the inflator 44 is arranged in the vehicle width direction outer side portion of the seat back 16 in a posture in which the axial direction is along the height direction of the seat back 16, that is, in a posture inclined forward and downward. It is fixed to the seatback frame 20 .

A gas ejection portion is provided at the lower end portion of the inflator 44, and an inflator connection portion 42D of the side airbag 42 is connected to the ejection portion. A side collision ECU 46 mounted on the vehicle is electrically connected to the inflator 44, as shown in FIG. A side impact sensor 48 for detecting a side impact is electrically connected to the side impact ECU 46 . The side collision ECU 46 is configured to activate the inflator 44 when a side collision (inevitable) is detected based on a signal from the side collision sensor 48 . If a collision prediction sensor (pre-crash sensor) that predicts (predicts) a side collision is electrically connected to the side collision ECU 46, the side collision ECU 46 detects a side collision based on a signal from the collision prediction sensor. The configuration may be such that the inflator 44 is activated when predicted.

As shown in FIG. 5, the side airbag 42 is normally stored in a folded state from the vehicle width direction outer side portion 16L of the seat back 16 along the upper end portion 16U via the shoulder opening 16S. In the folded side airbag 42, the body chamber 42B is arranged at the side portion 16L of the seat back 16, the constricted portion 42C is arranged at the shoulder 16S of the seat back 16, and the head chamber 42A is arranged at the upper end of the seat back 16. It is arranged in the part 16U. The head chamber 42A is housed in the upper end portion 16U of the seat back 16, extending to the vicinity of the headrest stay 19 on the outer side in the vehicle width direction. Further, the constricted portion 42C is accommodated in a bent state along the shoulder 16S of the seat back 16. - 特許庁A tear seam TS is formed in the seatback skin 24 from the vehicle width direction outer side portion 16L of the seatback 16 to the upper end portion 16U via the shoulder opening 16S. In FIG. 5, for convenience of explanation, the portion of the seat back cover 24 where the tear seam TS is set is indicated by a thick line.

As shown in FIG. 6, at the shoulder 16S of the seat back 16, as an example, the constricted portion 42C is folded into a roll shape. A loop cloth 50 as a loop portion is attached to a portion of the seatback upholstery 24 located at the shoulder opening 16S. The loop cloth 50 is composed of a cloth different from the seat back skin 24 and is arranged between the seat back skin 24 and the seat back pad 22 . The loop cloth 50 is sewn to the seat back skin 24 on both sides via the tear seam TS in a cross section of the seat back 16 viewed in the vehicle width direction. In the present embodiment, as an example, both ends of the loop cloth 50 are sewn together at the sewing portions S2 and S3 where the skin pieces of the seat back skin 24 are sewn together. The loop cloth 50 is formed longer than the portion of the seat back upholstery 24 that the loop cloth 50 faces. In the stored state of the side airbag 42 shown in FIG. 6, the excess length portion 50E provided in the intermediate portion of the loop cloth 50 is folded into a Z-shaped cross section as viewed in the vehicle width direction, for example. The loop cloth 50 is made of a cloth material that is less likely to stretch than the seat back cover 24 .

In the vehicle seat 10 configured as described above, when the inflator 44 is activated, gas is ejected from the ejection portion into the trunk chamber 42B. The gas supplied into the trunk chamber 42B is also supplied to the head chamber 42A through the constricted portion 42C, and the side airbag 42 begins to inflate. When the inflation pressure of the side airbag 42 is applied to the seat back skin 24, the tear seam TS is torn. As a result, the side airbag 42 is inflated and deployed between the occupant P and the side portion of the vehicle body (not shown). When the side airbag 42 is inflated and deployed, the constricted portion 42C of the side airbag 42 is bound to the shoulder 16S of the seatback 16 by the loop cloth 50, as shown in FIGS. The constricted portion 42</b>C is restrained to the shoulder 16</b>S by the loop cloth 50 and is held in a bent state along the shoulder 50 .

Specifically, as shown in FIG. 8, the loop cloth 50 wraps around the constricted portion 42C, which expands and expands in a circular shape, in an inverted U shape from above in a cross section viewed in the vehicle width direction. As a result, the constricted portion 42C is restrained by the shoulder 16S with its axis aligned substantially in the vehicle width direction. As a result, the head chamber 42A, which is housed in the upper end portion 16U of the seat back 16 on the headrest 18 side of the constricted portion 42C, is prevented from being displaced outward in the vehicle width direction. It is configured to be inflated and deployed between the head H of the occupant P. In FIGS. 1, 2 and 7, the loop cloth 50 is marked with dots so that the loop cloth 50 can be easily recognized.

As shown in FIGS. 1 and 2, the head chamber 42A inflates and deploys upward and forward from the inner end of the constricted portion 42C in the vehicle width direction. Contact or closely oppose from the direction outside. The inflated and deployed head chamber 42A is arranged adjacent to the headrest 18 on the vehicle width direction outer side and the vehicle front side. The trunk chamber 42B is inflated and deployed in a long shape having a longitudinal direction in the height direction of the seat back 16, and the upper end of the trunk chamber 42B is integrally connected to the vehicle width direction inner end of the constricted portion 42C. becomes. The trunk chamber 42B contacts or closely faces the chest, abdomen, and waist of the occupant P from the outside in the vehicle width direction. Although not shown, a duct (inner tube) for distributing the gas from the inflator 44 into the body chamber 42B and the head chamber 42A may be arranged inside the side airbag 42. .

<Action and effect>
Next, the operation and effects of this embodiment will be described.

In the vehicle seat 10 configured as described above, the occupant P is restrained by the seat body 12 using the three-point seat belt 32 . When a vehicle side impact is detected or predicted, the inflator 44 generates gas. This gas is supplied to the side airbag 42 stored in a folded state along the upper end portion 16U from the vehicle width direction outer side portion 16L of the seat back 16 of the seat body 12 through the shoulder portion 16S. As a result, the side airbag 42 is inflated and deployed to the side of the occupant P.

The side airbag 42 is composed of a single bag body and has a constricted portion 42C between an upper head chamber 42A and a lower body chamber 42B. The constricted portion 42C is bound to the shoulder 16S by a loop cloth 50 attached to a portion of the seat back upholstery 24 located at the shoulder 16S. As a result, the head chamber 42A is inflated and deployed between the shoulder belt 32A of the seat belt 32 and the head H of the occupant P. Thus, according to the present embodiment, even if the side airbag 42 having the head chamber 42A and the body chamber 42B is composed of a single bag body, there is a gap between the shoulder belt 32A and the head H. It is possible to stabilize the expansion and deployment of the head chamber 42A to the .

The above effect will be supplementarily explained by comparison with the first comparative example 60 shown in FIGS. 9 to 11. FIG. Although this first comparative example 60 does not include the loop cloth 50, the configuration other than that is the same as that of the vehicle seat 10 according to the first embodiment. Also in the first comparative example 60, as shown in FIG. 9, the head chamber 42A in the folded state is accommodated at the upper end portion 16U of the seat back 16 to the vicinity of the headrest stay 19 on the outside in the vehicle width direction. It is When the side airbag 42 is inflated and deployed in the first comparative example 60, first, as shown in FIG. Begin to deploy to the outside of the bag 16. Due to this expansion and deployment of the trunk chamber 42B, the head chamber 42A housed in the upper end portion 16U of the seat back 16 is pulled outward in the vehicle width direction (direction of arrow D in FIG. 10). 11, the head chamber 42A rises vertically right above the body chamber 42B, and is pulled outward in the vehicle width direction with respect to the shoulder belt 32A, that is, in the vehicle width direction with respect to the head H. It inflates and deploys to a position away from the outside. As a result, there is a time lag before the head H is restrained by the head chamber 42A.

On the other hand, in this embodiment, when the side airbag 42 in the folded state shown in FIG. The loop cloth 50 restrains the above-mentioned tension of the head chamber 42A when the head chamber 42A is pulled. Specifically, a force (see arrow R in FIG. 13) is applied to the constricted portion 42C from the loop cloth 50 wound around the constricted portion 42C to prevent the constricted portion 42C from rising upward. As a result, pulling of the head chamber 42A in the direction of arrow D in FIG. 13 is suppressed. As a result, as shown in FIG. 14, the head chamber 42A is inflated and deployed between the head H and the shoulder belt 32A. As shown in FIG. 15, the constricted portion 42C around which the loop cloth 50 is wound is the narrowest constricted portion of the inflated and deployed side airbag 42, so that the constricted portion 42C is not constrained by the loop cloth 50. It is possible to prevent inadvertent release.

Further, since the loop cloth 50 holds the constricted portion 42C of the side airbag 42 on its surface, the movable range of the head chamber 42A can be restricted to a narrow range. That is, for example, as in a second comparative example 70 shown in FIG. 16, by connecting the rear end portion of the head chamber 42A and the headrest stay 19 with a strip-shaped tether 72, the head chamber 42A is moved toward the head H side. It can be inflated and deployed. However, in the second comparative example 70, the head chamber 42A can move along the trajectory of the arc A with the headrest stay 19 as the center and the length of the tether 72 as the radius. There is a problem that the range is wide and the deployment position of the head chamber 42A is not stable.

On the other hand, since the loop cloth 50 of this embodiment holds the constricted portion 42C with its surface in the direction indicated by the arrow K in FIG. Limited. As a result, the deployment behavior of the head chamber 42A and the body chamber 42B is stabilized, and the deployment positions of the chambers 42A and 42B are further stabilized. Moreover, since the loop cloth 50 is sewn to the seat back upholstery 24, the assembly work of the side airbag device 40 to the seat back frame 20 at the time of manufacturing the vehicle seat 10 can be carried out as before. is easy.

Further, in this embodiment, when the gas generated by the inflator 44 is supplied to the side airbag 42 , the inflation pressure of the side airbag 42 is applied to the seat back skin 24 . A tear seam TS is set in the seatback skin 24 from the side portion 16L of the seatback 16 to the upper end portion 16U via the shoulder portion 16S. When the tear seam TS is torn by the inflation pressure of the side airbag 42 , the side airbag 42 is inflated and deployed to the outside of the seat back 16 . A loop cloth 50 made of a different fabric from the seat back upholstery 24 is attached to the seat back upholstery 24 . The loop cloth 50 is sewn to the seat back skin 24 on both sides via the tear seam TS in a cross section of the seat back 16 viewed in the vehicle width direction. This loop cloth 50 binds the constricted portion 42C of the side airbag 42 to the shoulder 16S of the seat back 16 after the tear seam TS is torn. In this way, since the loop cloth 50 (loop portion) is formed of a cloth separate from the seatback upholstery 24, the degree of freedom in designing the loop portion is increased.

In addition, since the loop cloth 50 is formed longer than the portion of the seatback upholstery 24 that the loop cloth 50 faces, it is possible to prevent or suppress the expansion of the constricted portion 42C from being restricted by the loop cloth 50 . As a result, the cross-sectional area of the constricted portion 42C is sufficiently enlarged, and the gas flows in the side airbag 42 through the constricted portion 42C.

Next, a second embodiment of the invention will be described. In addition, the same reference numerals as in the first embodiment are given to the configurations and actions that are basically the same as those in the first embodiment, and the description thereof will be omitted.

FIG. 18 is a front view showing a state before inflation and deployment of the side airbag 42 in the vehicle seat 80 according to the second embodiment of the invention. FIG. 19 shows an enlarged cross-sectional view of a cut surface along line F19-F19 of FIG. FIG. 20 is a front view showing a state in which the side airbag 42 in the vehicle seat 80 has been fully inflated and deployed. FIG. 21 shows an enlarged cross-sectional view of a cut surface along line F21-F21 of FIG.

In this embodiment, a loop portion 82 is formed by a portion of the seatback upholstery 24 located at the shoulder 16S of the seatback 16, and the loop cloth 50 in the first embodiment is omitted. In this embodiment, in the seat back skin 24, a skin piece 24A forming the upper surface of the seat back 16 on the outside in the vehicle width direction, and a skin piece 24B forming the front upper surface of the side portion 16L on the outside in the vehicle width direction of the seat back 16. A loop portion 82 is configured by and. The loop portion 82 is made of a material that stretches more easily than the other portions of the seatback upholstery 24 . In this embodiment, tear seams TS1 and TS2 are set on the seat back skin 24 so as to be separated into the side portion 16L and the upper end portion 16U without passing through the shoulder 16S of the seat back 16. As shown in FIG. In the shoulder opening 16S, the skin piece 24A and the skin piece 24B are sewn together at a sewn portion S4 (see FIGS. 19 and 21) that is tougher than the tear seams TS1 and TS2. In this embodiment, the configuration other than the above is the same as that of the first embodiment.

In this embodiment, when the gas generated by the inflator 44 is supplied to the side airbag 42 , the inflation pressure of the side airbag 42 is applied to the seat back skin 24 . As a result, the tear seams TS1 and TS2, which are separated from the side portion 16L and the upper end portion 16U of the seat back 16, are torn by the above inflation pressure, and the side airbag 42 is inflated and deployed to the outside of the seat back 16. At this time, a loop portion 82 formed by a portion of the seatback skin 24 located at the shoulder 16S of the seatback 16 restrains the constricted portion 42C of the side airbag 42 to the shoulder 16S of the seatback 16. As shown in FIG. As a result, in this embodiment as well, the deployment behavior of the head chamber 42A can be stabilized as in the first embodiment. Moreover, since the loop portion 82 is formed of a portion of the seatback upholstery 24, the loop cloth 50 in the first embodiment can be omitted, and the loop portion 82 can be simplified.

Furthermore, since the loop portion 82 is made of a material that stretches more easily than the other portions of the seatback upholstery 24, it is possible to prevent or suppress the loop portion 82 from restricting the expansion of the constricted portion 42C. As a result, the cross-sectional area of the constricted portion 42C is sufficiently enlarged, and the gas flows in the side airbag 42 through the constricted portion 42C.

In the first embodiment, the loop cloth 50 is formed longer than the portion of the seatback upholstery 24 that the loop cloth 50 faces, and is made of a cloth material that is less stretchable than the seatback upholstery 24 . Alternatively, the loop cloth 50 may be formed to have the same length as the portion of the seatback upholstery 24 that the loop cloth 50 faces and may be made of a cloth material that is more stretchable than the seatback upholstery 24 .

Further, in each of the above-described embodiments, the body chamber 42B of the side airbag 42 is configured to have a size capable of restraining the occupant P from the chest to the waist. The size can be changed as appropriate.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. In addition, it goes without saying that the scope of rights of the present invention is not limited to the above embodiments.

REFERENCE SIGNS LIST 10 vehicle seat equipped with side airbag device 12 seat body 16 seatback 16L side portion 16S shoulder opening 16U upper end portion 24 seatback skin 32 3-point seat belt 32A shoulder belt 42 side airbag 42A head chamber 42B body portion Chamber 42C Constricted portion 44 Inflator 50 Loop cloth (loop portion)
80 Vehicle seat equipped with side airbag device 82 Loop portion TS Tear seam TS1 Tear seam TS2 Tear seam P Occupant H Head

Claims (5)

a seat body in which an occupant is restrained using a three-point seat belt;
an inflator that generates gas when a side collision of the vehicle is detected or predicted;
It is composed of a single bag body, and is stored in a folded state along the upper end portion through the shoulder from the side portion on the vehicle width direction outer side of the seat back of the seat body, and is inflated to the side of the occupant when the gas is supplied. a side airbag that deploys and has a constriction between an upper head chamber and a lower torso chamber;
It consists of a portion of the seat back surface positioned at the shoulder or a separate cloth attached to the relevant portion, and by constraining the constricted portion to the shoulder at the time of inflation and deployment, the head chamber is moved to the seat belt. a loop portion that is inflated and deployed between the shoulder belt and the occupant's head;
A vehicle seat equipped with a side airbag device. A tear seam is set on the skin of the seat back along the upper end from the side through the shoulder,
2. The side airbag device according to claim 1, wherein the loop portion is made of the separate cloth and is sewn to the outer skin on both sides via the tear seam in a cross section of the seat back viewed from the vehicle width direction. Installed vehicle seat. 3. The vehicle seat according to claim 2, wherein the loop portion is formed longer than a portion of the outer skin that the loop portion faces. A tear seam is set on the skin of the seat back so as to be divided into the side portion and the upper end portion without passing through the shoulder,
2. The vehicle seat equipped with a side airbag device according to claim 1, wherein the loop portion is formed by a portion of the skin of the seat back located at the shoulder. 5. The vehicle seat equipped with a side airbag device according to claim 4, wherein the loop portion is made of a material that stretches more easily than other portions of the outer skin.

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