JP2020172233A - Side airbag device - Google Patents

Abstract

To provide a side airbag device which reduces a load in expanding and deploying, and improves heat resistance to high-temperature gas jetted from an inflator.SOLUTION: An inflator 34 arranged opposite to a side surface of a side frame 24A is provided in a side support part 18A of a seat back 18. The inflator 34 is housed in an inside and a rear end part in a seat longitudinal direction of the side airbag 32, and its periphery is covered with a flow-regulation cloth 36. The side airbag 32, the inflator 34, and the flow-regulation cloth 36 are fixed to the side frame 24A by using a stud bolt. In the side airbag 32, a sewn part 68, which is formed by sewing the side airbag 32 and the flow-regulation cloth 36 to surround a through hole 42, is formed in a position on a seat front side than a deformed area Q.SELECTED DRAWING: Figure 7

Description

The present invention relates to a side airbag device.

Patent Document 1 below discloses a side airbag device in which a bag-shaped side airbag is housed on the outer side of a vehicle seat bag in the seat width direction. An inflator is housed inside and at the rear end of the side airbag, and receives gas from the inflator to expand and expand the side support portion on the front side of the seat and on the upper side of the seat. Further, stud bolts are arranged on the outer peripheral portion of the inflator, and the side airbag and the inflator are fastened to the seat frame of the seat back using the stud bolts.

Further, a tubular rectifying cloth (inner tube) that covers the periphery of the inflator is arranged inside the side airbag to prevent the high-temperature gas ejected from the inflator from directly hitting the side airbag. This improves the heat resistance of the side airbag.

Japanese Unexamined Patent Publication No. 2018-016252

By the way, at the rear end of the side airbag, a load is applied to the peripheral edge of the through hole (bolt hole) through which the stud bolt penetrates due to a sudden increase in internal pressure due to the expansion and deployment of the airbag. Therefore, it is conceivable to partially suture a rectifying cloth to the side airbag to reinforce the side airbag so as to surround the through hole.

However, when the side airbag and the rectifying cloth are sewn together, a suture hole through which the suture is passed is formed in the rectifying cloth. Therefore, if the load during deployment of the side airbag is concentrated on the peripheral edge of the suture hole, the suture hole may expand and the gas ejected from the inflator may pass through the suture hole. As a result, the heat resistance of the main body base cloth may be locally reduced, so there is room for improvement.

In consideration of the above facts, an object of the present invention is to obtain a side airbag device capable of reducing the load during expansion and deployment of the side airbag and improving the heat resistance against the high temperature gas ejected from the inflator. To do.

The side airbag device according to the present invention according to claim 1 is provided in the side portion of the seat back of the vehicle seat on the outer side in the seat width direction so as to face the side surface of the seat frame, and the seat is provided by using stud bolts. An inflator that is fixed to the frame and generates gas for expansion by operating, and a through hole through which the stud bolt of the inflator, which is formed in a bag shape and housed in the rear end in the front-rear direction of the seat, penetrates. A side airbag that is fixed to the seat frame using the stud bolt and expands and expands on the front side of the seat and the upper side of the seat by the gas, and around the inflator that is arranged inside the side airbag. The rectifying cloth fixed to the seat frame by using the stud bolt of the inflator and the side airbag are located on the rear side of the seat of the inflator and in the vicinity of the gas ejection part of the inflator in the expanded and deployed state. The side airbag and the rectifying cloth are sewn together so as to surround the through hole at a position on the front side of the seat with respect to the deformed region of the side airbag.

In the side airbag device according to the present invention according to claim 1, since the rectifying cloth covering the periphery of the inflator is arranged inside the side airbag, if the high temperature gas ejected from the inflator directly hits the side airbag. Absent. As a result, the heat resistance of the side airbag to the high temperature gas ejected from the inflator is improved.

Further, a through hole formed at the rear end of the side airbag is reinforced by a sewn portion in which the side airbag and the rectifying cloth are sewn so as to surround the through hole. As a result, when a load is applied to the through hole due to an increase in the internal pressure accompanying the expansion and deployment of the side airbag, the side airbag is suppressed from being deformed starting from the through hole.

By the way, when the inflator is activated, gas is supplied to the inside of the side airbag, and the side airbag is expanded and deployed on the front side of the seat and on the upper side of the seat. Therefore, on the side airbag, the load at the time of deployment is concentrated on the rear end portion of the side airbag fixed to the seat frame. Further, when gas heat is transferred from the inflator to the rear end portion, the base cloth of the side airbag is deformed. Therefore, the portion located behind the seat of the inflator and in the vicinity of the gas ejection portion of the inflator in the expanded and deployed state of the side airbag is defined as a deformation region in which the base fabric is deformed. When a suture portion is formed in the deformed region of the side airbag, the suture hole is likely to expand inside the rectifying cloth due to the influence of the high temperature gas ejected from the inflator in addition to the load at the time of deployment. Become.

Here, in the side airbag device according to the present invention according to claim 1, the sewn portion is provided on the front side of the seat with respect to the deformed region of the side airbag described above. Therefore, since the suture portion is formed while avoiding the region where the side airbag is deformed, the expansion of the suture hole can be suppressed. As a result, it is possible to prevent or suppress the high-temperature gas ejected from the inflator from reaching the side airbag through the suture holes of the rectifying cloth, thereby suppressing the deterioration of the heat resistance of the side airbag. it can.

In the side airbag device according to the present invention according to claim 2, in the configuration according to claim 1, the rectifying cloth is at least an intermediate cloth arranged inside the side airbag and an inner layer of the intermediate cloth. A plurality of cloth materials including an inner cloth arranged on the side are laminated in a layered manner, and the suture portion is an outer layer side suture that sews the side airbag and the intermediate cloth so as to surround the through hole. It is provided with a portion and an inner layer side suture portion that is formed at a position offset from the suture line of the outer layer side suture portion and that sew the intermediate cloth and the inner cloth so as to surround the through hole.

In the side airbag device according to the present invention according to claim 2, the rectifying cloth arranged so as to cover the periphery of the inflator is placed on the intermediate cloth arranged inside the side airbag and the inner layer side of the intermediate cloth. A plurality of cloth materials including the arranged inner cloth are laminated in a layered manner.

Here, the suture portion for suturing the side airbag and the rectifying cloth is arranged on the outer layer side suture portion for suturing the side airbag and the intermediate cloth arranged on the inner layer side thereof, and on the intermediate cloth and the inner layer side thereof. It is provided with an inner layer side suture portion for suturing with the inner cloth. Further, the inner layer side suture portion is formed at a position offset with respect to the suture line of the outer layer side suture portion. Therefore, the suture holes formed in the inner layer side suture portion are formed at positions offset from the suture holes formed in the outer layer side suture portion, and all the cloth materials constituting the rectifying cloth are used as the rectifying cloth. No suture holes are formed to penetrate. As a result, the high-temperature gas ejected from the inflator is suppressed from passing through the suture hole on the side airbag side after passing through the suture hole of the inner layer cloth. As a result, the heat resistance of the side airbag is improved.

In the side airbag device according to the present invention according to claim 3, in the configuration according to claim 2, the rectifying cloth is the outer layer side suture portion rather than the number of cloth materials sewn by the inner layer side suture portion. It is said that the number of cloth materials sewn together is larger.

In the side airbag device according to the present invention according to claim 3, the temperature of the rectifying cloth is higher than the number of cloth materials sewn by the inner layer side suture portion which is easily affected by the high temperature gas ejected from the inflator. The number of cloth materials sewn by the outer layer side stitched portion, which is less affected by gas, is larger. As a result, the heat resistance of the side airbag can be improved while efficiently avoiding heat damage caused by gas heat.

In the side airbag device according to the present invention according to claim 4, in the configuration according to claim 2 or 3, the outer layer side suture portion is the inner layer side of the seat front-rear rear end portion in the suture portion. It is formed at a position offset to the rear side of the seat from the sutured portion.

In the side airbag device according to the present invention according to claim 4, the sutured portion for suturing the side airbag and the rectifying cloth is such that the outer layer side suture portion is larger than the inner layer side suture portion at the rear end portion in the front-rear direction of the seat. It is formed at an offset position on the rear side of the seat. As a result, the rectifying cloth is bonded to and reinforced in the area on the rear end side of the seat of the side airbag, which has a large load during deployment, by utilizing the outer layer side suture portion which is less affected by the high temperature gas ejected from the inflator. be able to. As a result, the heat resistance of the side airbag is improved, and the deformation of the side airbag due to the load during deployment is further suppressed.

The side airbag device according to the present invention according to claim 5 has the configuration according to any one of claims 2 to 4, wherein the rectifying cloth is formed in a tubular shape in which an inflator is housed. At the same time, the gas supplied from the inflator is supplied to the inside of the side airbag through an opening formed at the end in the axial direction, and the rectifying cloth is provided with the gas ejection portion of the inflator. In the vicinity, a rectifying suture portion is formed in which the innermost cloth arranged on the innermost layer side in contact with the inflator and the cloth material on the outer layer side of the innermost cloth are sewn together.

In the side airbag device according to the present invention according to claim 5, the innermost cloth and the innermost cloth arranged on the innermost layer side in contact with the inflator are located in a portion of the rectifying cloth near the gas ejection portion of the inflator. A rectifying suture portion is formed in which the cloth material on the outer layer side of the cloth is sutured. As a result, it is possible to suppress the swing of the rectifying cloth in the vicinity of the gas ejection portion immediately after the inflator is operated. As a result, the heat resistance of the side airbag can be improved by the rectifying cloth, and the gas can be rectified as intended.

As described above, according to the side airbag device according to claim 1, the load at the time of expansion and deployment of the side airbag can be reduced, and the heat resistance to the high temperature gas ejected from the inflator can be improved. It has an excellent effect.

According to the side airbag device according to claim 2, it is possible to further improve the heat resistance to the high temperature gas ejected from the inflator, which is an excellent effect.

According to the side airbag device according to claim 3, it is possible to improve the heat resistance of the side airbag while efficiently avoiding heat damage due to gas heat.

According to the side airbag device according to claim 4, the heat resistance of the side airbag can be improved, and the deformation of the side airbag due to the load during deployment can be further suppressed, which is an excellent effect.

According to the side airbag device according to claim 5, the heat resistance of the side airbag is improved by the rectifying cloth, and the gas can be rectified as intended, which is an excellent effect.

It is a side view of the vehicle seat on which the side airbag device which concerns on 1st Embodiment is mounted, and is the figure which shows the expansion | expansion state of the side airbag. It is a side sectional view which shows the internal structure of the side airbag shown in FIG. It is an exploded perspective view which shows roughly the positional relationship between the rectifying cloth and an inflator shown in FIG. It is a developed view which shows the suture part formed in the rectifying cloth shown in FIG. It is a developed view which shows the rectifying suture part formed in the rectifying cloth shown in FIG. It is a figure which shows the structure of the periphery including the outer side part of the seat back in the vehicle width direction which is shown in FIG. 1, and shows the initial state of deployment of a side airbag in the side airbag device which concerns on embodiment of this invention. It is a plan sectional view which shows. It is a figure which shows the structure of the periphery including the outer side part of the seat back in the vehicle width direction which is shown in FIG. 1, and shows the state of the side airbag in the side airbag apparatus which concerns on embodiment of this invention in the latter stage of deployment. It is a plan sectional view which shows. It is a developed view corresponding to FIG. 4 which shows the suture part of the rectifying cloth which concerns on 2nd Embodiment. It is sectional drawing which shows typically the structure of the suture part shown in FIG. It is a figure for demonstrating the suture part as a comparative example.

<First Embodiment>
Hereinafter, the side airbag device 30 according to the first embodiment will be described with reference to FIGS. 1 to 7. The arrow FR appropriately shown in each figure indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow RH indicates the right side of the vehicle. In the following description, when the front-rear, up-down, and left-right directions are used without special mention, the front-rear direction of the vehicle front-rear direction, the up-down direction of the vehicle up-down direction, and the left-right direction when facing the traveling direction are used.
(overall structure)
As shown in FIG. 1, the vehicle seat 14 is connected to the seat cushion 16 on which the occupant sits, the seat back 18 tiltably supported at the rear end of the seat cushion 16, and the upper end of the seat back 18. It is equipped with a cushioned headrest 20. The vehicle seat 14 is, for example, a passenger seat of a left-hand steering wheel vehicle.

The side airbag device 30 is mounted on a side support portion 18A (side portion: hereinafter referred to as “side portion 18A”) outside the seat back 18 of the vehicle seat 14 in the seat width direction. More specifically, the side airbag device 30 of the present embodiment is mounted on the side portion 18A located on the central side in the vehicle width direction, and is a so-called far side airbag device.

The front-rear direction, left-right direction (width direction), and up-down direction of the vehicle seat 14 coincide with the front-rear direction, left-right direction (width direction), and up-down direction of the vehicle. Further, in FIG. 1, a dummy P for a collision test is seated on the vehicle seat 14 instead of the actual occupant. This dummy P is, for example, AM50 (50th percentile of an American adult male) of WorldSID (World Side Impact Dummy). Hereinafter, the dummy P will be referred to as an "occupant P" for the sake of clarity.

(Side airbag device 30)
As shown in FIG. 1, the side airbag device 30 includes a side airbag 32, an inflator 34, and a rectifying cloth 36. The side airbag 32 and the inflator 34 are normally modularized and housed in the side portion 18A.

The side airbag 32 expands and expands between the occupant P and the front console (not shown) provided in the center of the front chamber of the vehicle in the vehicle width direction by the pressure of the gas generated from the inflator 34. At the time of this expansion and deployment, the pad material and the seat skin (not shown) arranged on the side portion 18A are configured to be broken by receiving the expansion pressure of the side airbag 32. The side airbag 32 can also be applied to the front chamber of a vehicle that does not have a front console in the center in the vehicle width direction.

The front-back and up-down directions described in the following description regarding the side airbag 32 indicate the direction as a member of the side airbag 32, and when the side airbag 32 is expanded and expanded, the front and rear of the seat back 18 It almost coincides with the vertical direction.

The side airbag 32 is formed in a bag shape by, for example, a base cloth formed by cutting out a nylon-based or polyester-based cloth material, folded in half, and sewn on the outer peripheral edge portion. .. Hereinafter, in the base cloth folded in half, the portion arranged inside in the seat width direction is referred to as the inner base cloth 38 in the expanded and deployed state of the side airbag 32, and the portion arranged outside in the seat width direction is referred to as the outer base cloth. It is set to 40 (see FIGS. 1, 6, and 7). A pair of upper and lower through holes 42 are formed in the inner base cloth 38 at the lower portion and the lower end portion, and correspond to the stud bolt 34B for fixing the inflator 34 described later (see FIGS. 6 and 7).

The side airbag 32 is a so-called two-chamber side airbag here, and is divided into a front chamber 46 and a rear chamber 48 by a front and rear partition portion 44. The front and rear partition 44 is composed of a tether (partition wall) attached to the inside of the side airbag 32 or a seam (sewing portion) on which the base cloth of the side airbag 32 is sewn. Further, the front chamber 46 and the rear chamber 48 are communicated with each other by a communication port 50 (inner vent hole) formed in the front and rear partition portions 44.

The manufacturing method of the side airbag 32 is not limited to the above, and can be appropriately changed. For example, the side airbag 32 may be formed by overlapping the two base fabrics and sewing the outer peripheral edge portion.

The side airbag 32 is formed so as to form an elongated substantially oval shape along the vertical direction of the seat back 18 when the expanded and deployed state is viewed from the side. The size of the side airbag 32 is set to a size capable of restraining (protecting) the head H, shoulder S, chest C, abdomen B, and lumbar L of the occupant P seated on the vehicle seat 14. ..

As shown in FIGS. 1, 6 and 7, the inflator 34 is housed in the rear end 32A of the side airbag 32 together with the rectifying cloth 36. The rectifying cloth 36 is a cloth diffuser, and is a member also called a loop diffuser, an inner tube, or the like. The rectifying cloth 36 is sewn in a cylindrical shape in a state in which a plurality of cloth materials (six sheets in the present embodiment) formed by cutting out a cloth material similar to the base cloth of the side airbag 32 into a rectangular shape are stacked in layers. Is formed. The rectifying cloth 36 is arranged so that the axial direction is along the vertical direction of the seat back 18. The upper end portion of the rectifying cloth 36 penetrates the rear end portion of the front / rear partition portion 44 and projects into the front chamber 46. The details of the rectifying cloth 36 will be described later.

The inflator 34 is a so-called cylinder type gas generator, and is formed in a cylindrical shape. In the inflator 34, the gas ejection portion 34A is arranged at the upper end portion, and the inflator 34 is housed inside the rectifying cloth 36 in a posture in which the axial direction is along the vertical direction of the seat back 18.

Further, the inflator 34 is fixed to the outer surface of the seat back frame 24, which is a skeleton member of the seat back 18, in the seat width direction, together with a substantially U-shaped reaction force plate 52 opened to the front side of the seat in a plan sectional view. (See Fig. 6). The reaction force plate 52 is configured to apply a deployment reaction force when the side airbag 32 is deployed. More specifically, a pair of upper and lower stud bolts 34B project inward in the seat width direction from the outer peripheral portion of the inflator 34. The upper and lower stud bolts 34B penetrate the inner base cloth 38 of the side airbag 32, the rectifying cloth 36, the reaction force plate 52, and the side frame 24A of the seat back frame 24, and the nut 54 is screwed to the tip side. There is. As a result, the inflator 34 is fastened and fixed to the seat back frame 24 together with the side airbag 32, the rectifying cloth 36, and the reaction force plate 52 (so-called side tightening). The seat back frame 24 corresponds to the "seat frame" in the present invention. Further, in FIGS. 1 and 7, the reaction force plate 52 is not shown.

A side collision ECU (Electrical Control Unit) 56 mounted on the vehicle is electrically connected to the inflator 34. A side collision sensor (not shown) for detecting a side collision is electrically connected to the side collision ECU 56. The side collision ECU 56 is configured to activate (operate) the inflator 34 when a side collision is detected based on a signal from the side collision sensor. When a pre-crash sensor that predicts (predicts) a side collision is electrically connected to the side collision ECU 56, an inflator is used when the side collision ECU 56 predicts a side collision based on a signal from the pre-crash sensor. The configuration may be such that 34 is activated.

When the inflator 34 is activated, gas is radially ejected from the gas ejection portion 34A provided at the upper end portion of the inflator 34. The gas distributed upward in the rectifying cloth 36 is supplied into the front chamber 46 from the axial upper end opening 36A of the rectifying cloth 36. Further, the gas distributed downward in the rectifying cloth 36 is supplied into the rear chamber 48 through the lower end opening 36B of the rectifying cloth 36. A part of the gas supplied to the rear chamber 48 is supplied into the front chamber 46 through the communication port 50 formed in the front and rear partition portions 44. As a result, the side airbag 32 expands and expands to the front side of the seat and the upper side of the seat of the side portion 18A, and is interposed between the occupant P and the front console (not shown).

Here, as shown in FIG. 6, at the initial stage of deployment of the side airbag 32, the front end side of the bag-shaped side airbag 32 expands to the front side of the seat, so that the inner base cloth 38 is deployed on both the left and right sides of the inflator 34. And a tensile load in the front direction of the sheet is applied to the rear end portion of the outer base cloth 40. Therefore, the load is concentrated on the rear end portion 32A of the side airbag 32 and the portion located on the rear side of the seat of the inflator 34. Further, when the gas heat from the inflator 34 is transmitted to the rear end portion 32A, the base cloth of the side airbag 32 is deformed. Therefore, the portion located on the rear side of the seat of the inflator 34 and in the vicinity of the gas ejection portion 34A of the inflator 34 in the expanded and deployed state of the side airbag 32 is defined as the deformation region Q in which the base fabric is deformed.

In order to explain this deformation region Q more clearly, the behavior of the side airbag 32 during expansion and deployment will be described. When the side airbag 32 is expanded and deployed, the outer base cloth 40 not fixed to the side frame 24A moves to the front side of the seat more than the inner base cloth 38 fixed to the side frame 24A of the seat back frame 24. The amount is large. Therefore, in the vicinity of the gas ejection portion 34A of the inflator 34, the rear end portion of the inner base cloth 38 is pulled by the outer base cloth 40 that develops toward the front side of the seat. At this time, when the base cloth is deformed by the gas heat, the side airbag 32 is moved so as to rotate clockwise around the inflator 34 from the two-dot chain line position shown in FIG. 7 to the solid line position shown in FIG. 7 ( Refer to the arrow R1 direction in FIG. 7).

According to the above-mentioned behavior, the deformation region Q is a portion near the rear end of the outer base cloth 40 and the gas ejection part 34A of the inflator 34 at the initial stage of deployment of the side airbag 32, and the inner base cloth 38 at the latter stage of deployment. It is considered to be a rear end portion and a portion near the gas ejection portion 34A. In FIGS. 6 and 7, the rectifying cloth 36 is schematically shown as a single cloth material for convenience, but the rectifying cloth 36 is composed of a plurality of cloth materials as will be described later.

(Main part of the present invention)
FIG. 2 shows a side sectional view of the side airbag 32 at the time of expansion and deployment cut along the front-rear direction of the seat, and shows the outer surface of the inner base cloth 38 of the side airbag 32 in the seat width direction. There is. Further, FIG. 3 schematically shows the positional relationship between the rectifying cloth and the inflator by an exploded perspective view. As shown in these figures, the rectifying cloth 36 is formed by stacking a plurality of cloth materials (five pieces in the present embodiment) cut out in a substantially rectangular shape in a layered manner. As an example, each cloth material is the same cloth material as the base cloth of the side airbag 32. As an example, the rectifying cloth 36 is folded in half along the folding line T1 (see FIGS. 1, 4, and 5) in a state where the cloth materials are stacked. Then, the end portion of the overlapped rectifying cloth 36 is co-sewn with the rear end portion 32A of the side airbag 32 to form a tubular shape.

Further, the rectifying cloth 36 includes a rectifying portion 58 formed of the cloth material arranged on the inner layer side and a reinforcing portion 60 formed of the cloth material arranged on the outer layer side. The rectifying unit 58 is formed by stacking two cloth materials arranged on the inner layer side of the rectifying cloth 36. Hereinafter, the cloth material arranged on the innermost layer side of the rectifying unit 58 and in contact with the inflator 34 in the stored state of the side airbag 32 is referred to as the innermost cloth 58A, and the cloth material arranged on the outer layer side of the innermost cloth 58A is added. Cloth 58B.

As shown in FIG. 5, a pair of upper and lower bolt holes 62 are formed at one end of the rectifying unit 58. The bolt holes 62 are arranged coaxially with the through holes 42 formed in the inner base cloth 38 of the side airbag 32, and correspond to the stud bolts 34B of the inflator 34 described above. Further, a rectifying suture portion 64 having a rectangular frame-shaped sewing line is formed on the upper part of the innermost cloth 58A covering the vicinity of the gas ejection portion 34A of the inflator 34, and is sutured with the additional cloth 58B. As a result, in the innermost cloth 58A, the portion arranged in the vicinity of the gas ejection portion 34A of the inflator 34 is reinforced by combining with the additional cloth.

On the other hand, on the outer layer side of the rectifying portion 58, a reinforcing portion 60 formed by stacking three cloth materials is formed. As the cloth material constituting the reinforcing portion 60, the inner cloth 60A, the intermediate cloth 60B, and the outer cloth 60C are arranged in this order from the inner layer side facing the rectifying portion 58 to the outer layer side. A pair of upper and lower bolt holes 66 are formed at one end of the reinforcing portion 60. The bolt hole 66 has the same shape as the through hole 42 formed in the inner base cloth 38 of the side airbag 32, and is arranged coaxially with the through hole 42.

As shown in FIG. 4, the reinforcing portion 60 is sewn to the inner base cloth 38 of the side airbag 32 by a suture portion 68 having a suture line extending so as to surround the bolt hole 66. As a result, the peripheral edge of the through hole 42 of the inner base cloth 38 is combined with the reinforcing portion 60 to be reinforced.

The stitched portion 68 includes a first stitch 68A, a second stitch 68B, and a third stitch 68C. The first stitch 68A is formed in an annular shape along the peripheral edge of each bolt hole 66 (through hole 42). The second stitch 68B is formed in an annular shape that is one size larger than the first stitch 68A, and is concentric with the first stitch 68A. The third stitch 68C is formed on the outside of the second stitch 68B in an elongated ring shape in the vertical direction so as to surround the pair of bolt holes 66. Further, the sewn portion 68 having the above configuration is formed in the rectifying portion 58 (side airbag 32) on the front side of the seat with respect to the above-mentioned deformation region Q (see FIGS. 4, 6, and 7). Note that FIG. 4 shows a deformation region Q in the late stage of deployment of the side airbag 32. Further, in FIGS. 6 and 7, for convenience of explanation, the sutured portion 68 is shown in a simplified manner.

(Action and effect)
Next, the operation and effect of the first embodiment will be described.

In the side airbag device 30 having the above configuration, when the side collision ECU 56 detects a side collision by a signal from a side collision sensor (not shown), the side collision ECU 56 operates the inflator 34, and gas is ejected from the inflator 34.

In the present embodiment, since the rectifying cloth 36 that covers the periphery of the inflator 34 is arranged inside the side airbag 32, the high-temperature gas ejected from the inflator 34 does not directly hit the base cloth of the side airbag 32. As a result, the heat resistance of the side airbag 32 against the high temperature gas ejected from the inflator 34 can be improved.

Further, in the present embodiment, the through hole 42 formed in the rear end portion 32A of the side airbag 32 connects the base cloth of the side airbag 32 and the reinforcing portion 60 of the rectifying cloth 36 so as to surround the through hole 42. It is reinforced by the sutured portion 68. As a result, it is possible to prevent the side airbag 32 from being deformed starting from the through hole 42 when a load is applied to the through hole 42 due to an increase in the internal pressure accompanying the expansion and deployment of the side airbag 32.

Further, in the present embodiment, the suture portion 68 is provided on the front side of the seat with respect to the deformation region Q of the side airbag 32. Therefore, when the side airbag 32 is deployed, the suture portion 68 is formed while avoiding the region where the base cloth is deformed, so that the expansion of the suture hole can be suppressed. As a result, it is possible to prevent or suppress the high temperature gas ejected from the inflator 34 from reaching the side airbag 32 through the suture holes of the rectifying cloth 36, and the heat resistance of the side airbag 32 is lowered. It can be suppressed.

Further, in the present embodiment, the rectifying cloth 36 is rectified by suturing the innermost cloth 58A and the additional cloth 58B arranged on the innermost layer side in contact with the inflator at a portion of the rectifying cloth 36 located near the gas ejection portion 34A of the inflator 34. A suture portion 64 for use is formed. As a result, it is possible to suppress the swing of the rectifying cloth 36 in the vicinity of the gas ejection portion 34A immediately after the inflator 34 is operated. As a result, the heat resistance of the side airbag 32 can be improved by the rectifying cloth 36, and the gas can be rectified as intended.

<Second Embodiment>
Next, the second embodiment of the present invention will be described with reference to FIGS. 8 to 10. The same components and operations as those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and the description thereof will be omitted. In FIGS. 9 and 10, the outside of the side airbag 32 is indicated by an arrow OUT, and the inside of the side airbag 32 is indicated by an arrow IN.

The present embodiment is characterized in that the suture portion 70 for suturing the inner base cloth 38 and the rectifying cloth 36 of the side airbag 32 so as to surround the through hole 42 includes the outer layer side suture portion 72 and the inner layer side suture portion 74. And. The configuration other than the above is the same as that of the side airbag device 30 according to the first embodiment.

FIG. 8 is a developed view of the reinforcing portion 60 of the rectifying portion 58 before being formed in a cylindrical shape as viewed from the inner cloth 60A side, the outer layer side suture portion 72 is shown by a two-dot chain line, and the inner layer side suture portion is shown. It is shown by a solid line. Further, in FIG. 9, the suture portion 70 formed in the reinforcing portion 60 is schematically shown by a cross-sectional view of the reinforcing portion 60.

As shown in these figures, the outer layer side suture portion 72 is a suture line for co-sewing the inner base cloth 38 of the side airbag 32, the outer cloth 60C, and the intermediate cloth 60B. The outer layer side suture portion 72 is lock-sewn with a needle thread 76 sewn from the front surface side of the inner base cloth 38 and a bobbin thread 78 sewn from the back surface side of the intermediate cloth 60B. Specifically, using a sewing machine, a sewing machine needle (not shown) through which the needle thread 76 is passed through a needle hole (not shown) at the tip is pierced into the inner base cloth 38 from the surface side to form a suture hole 80. .. Next, the bobbin thread 78 is passed through a loop formed by slackening the needle thread 76 on the back surface side of the intermediate cloth 60B, and then the sewing needle is pulled out from the inner base cloth 38, and the knot 82 between the needle thread 76 and the bobbin thread 78 is together. The needle thread 76 is pulled up so as to come to the center in the thickness direction (extending direction of the stitch hole 80) of the three sewn cloth materials. By repeating this, the outer layer side suture portion 72 is formed. The outer layer side stitch portion 72 forms the first stitch 72A, the second stitch 72B, and the third stitch 72C corresponding to the first stitch 68A to the third stitch 68C of the first embodiment.

The inner layer side suture portion 74 is a suture line for co-sewing the intermediate cloth 60B and the inner cloth 60A of the reinforcing portion 60. The inner layer side suture portion 74 is lock-sewn with a needle thread 84 sewn from the back surface side of the inner cloth 60A and a bobbin thread 86 sewn from the front surface side of the intermediate cloth 60B. The inner layer side suture portion 74 is formed by using a sewing machine like the outer layer side suture portion, has a suture hole 88 penetrating the intermediate cloth 60B and the inner cloth 60A, and a knot 90 between the upper thread 84 and the lower thread 86. Is formed at the center in the thickness direction (extending direction of the suture hole 88) of the two co-sewn cloth materials. In FIG. 9, for convenience of explanation, the bobbin threads 78 and 86 are shown in parallel, so that the knots 82 and 90 are exposed on the front surface side and the back surface side of the intermediate cloth 60B. The inner layer side stitch portion 74 having the above configuration includes the first stitch 74A formed along the stitch line of each stitch inside the first stitch 72A, the second stitch 72B, and the third stitch 72C of the outer layer side stitch portion 72. The second stitch 74B and the third stitch 74C are formed.

In the step of forming the stitched portion 70 having the above configuration, first, the intermediate cloth 60B and the inner cloth 60A are overlapped to form the first stitch 74A of the inner layer side stitched portion 74 with a sewing machine, and then the outer cloth 60C and the inner base cloth 38 are formed. Turn it over again. Next, the first stitch 72A of the outer layer side suture portion 72 is formed by a sewing machine with only the inner cloth 60A woven inside the suture line. In this way, the second stitch 74B of the inner layer side suture portion 74 → the second stitch 72B of the outer layer side suture portion 72 → the third stitch 74C of the inner layer side suture portion 74 → the third stitch 72C of the outer layer side suture portion 72. It is a process of forming in order. That is, it may be formed in order from the sewing line near the peripheral edge of the through hole of the inner cloth 60A.

The stitched portion 70 is not limited to the sewing machine, and can be formed by hand sewing. When forming by hand sewing, each sewing line can be formed by wave stitching, reverse stitching, or the like.

(Action and effect)
Next, the operation and effect of the second embodiment will be described.

In the present embodiment, the suture portion 70 that sews the side airbag 32 and the rectifying cloth 36 sandwiches the outer cloth 60C, and the outer layer side suture portion 72 that sews the side air bag 32 and the intermediate cloth 60B, and the intermediate cloth 60B. An inner layer side suture portion 74 for suturing the inner cloth 60A is provided. Further, the inner layer side suture portion 74 is formed at a position offset with respect to the suture line of the outer layer side suture portion 72. As a result, the suture hole 88 of the inner layer side suture portion 74 is formed at a position offset from the suture hole 80 of the outer layer side suture portion 72, and the rectifying cloth 36 is not formed with a suture hole penetrating all the cloth materials. .. As a result, as shown in FIG. 9, the high-temperature gas 94 ejected from the inflator 34 may pass through the suture hole 80 penetrating the side airbag 32 inner base cloth 38 after passing through the suture hole 88. It is suppressed. As a result, the heat resistance of the side airbag 32 can be improved.

The above effect will be described with reference to the suture portion 100 as a comparative example shown in FIG. As shown in FIG. 10A, in the stitched portion 100, the base cloth 102 of the side airbag is combined with the needle thread 106 together with the inner cloth 104A, the intermediate cloth 104B, and the outer cloth 104C constituting the rectifying cloth 104. Lockstitch is performed using the bobbin thread 108. Therefore, the suture portion 100 is formed with a suture hole 110 that penetrates the base cloth 102, the inner cloth 104A, the intermediate cloth 104B, and the outer cloth 104C. As a result, as shown in FIG. 10B, the high-temperature gas 94 ejected from the gas ejection portion 34A of the inflator 34 expands the suture hole 88 and melts the needle thread 106 and the bobbin thread 108 while rectifying the cloth. It may pass through 104 and through the base fabric 102 of the side airbag. On the other hand, in the present embodiment, this can be avoided.

Further, in the present embodiment, in the rectifying cloth 36, three cloth materials are sewn together by the outer layer side suture portion 72, and two cloth materials are sewn by the inner layer side suture portion 74. That is, the number of cloth materials sewn by the outer layer side suture portion 72, which is less affected by the gas, than the number of cloth materials sewn by the inner layer side suture portion 74, which is easily affected by the high temperature gas ejected from the inflator 34. It is said that there are more of them. As a result, the heat resistance of the side airbag 32 can be improved while efficiently avoiding heat damage due to gas heat.

Further, in the present embodiment, in the suture portion 70 for suturing the side airbag 32 and the rectifying cloth 36, the outer layer side suture portion 72 is offset to the outside of the inner layer side suture portion 74. That is, the suture portion 70 is formed at a position where the outer layer side suture portion 72 is offset to the rear side of the seat with respect to the inner layer side suture portion 74 at the rear end portion in the front-rear direction of the seat. As a result, the rectifying cloth 36 is coupled to the area on the seat rear end side of the side airbag 32, which has a large load during deployment, by utilizing the outer layer side suture portion 72 which is less affected by the high temperature gas ejected from the inflator 34. Can be reinforced and reinforced. As a result, the heat resistance of the side airbag 32 can be improved, and the deformation of the side airbag 32 due to the load during deployment can be further suppressed.
[Supplemental Information]

In each of the above embodiments, the side airbag 32, the inflator 34, and the reaction force plate 52 are arranged on the outer surface of the side frame 24A in the seat width direction, but the present invention is not limited to this. These may be arranged on the inner side surface of the side frame 24A in the seat width direction. Further, the reaction force plate may be omitted.

Further, in each of the above embodiments, the side airbag 32 is a far side airbag, but the present invention is not limited to this. It may be configured as a near-side airbag.

Further, in each of the above embodiments, the rectifying cloth 36 is formed in a tubular shape, but the present invention is not limited to this. The shape may be any shape that covers the gas ejection portion of the inflator and has an opening for supplying the gas ejected from the inflator to the inside of the side airbag.

Further, in each of the above embodiments, the rectifying cloth 36 is formed by stacking five cloth materials in layers, but the present invention is not limited to this. In the first embodiment, one or more sheets may be used, and in the second embodiment, two or more sheets may be used. That is, in the second embodiment, the outer cloth 60C may not be included.

Further, in each of the above embodiments, the rectifying cloth may be configured not to have a rectifying portion. In this case, in the first embodiment, the rectifying suture portion 64 may be formed on the reinforcing portion 60. That is, the inner cloth 60A may be formed as the innermost layer cloth.

Further, in the first embodiment, the stitched portion 68 is configured to include the first stitch 68A to the third stitch 68C, but the present invention is not limited to this. Of these, any stitch may be omitted, or the number of stitches may be increased. This point is the same for the outer layer side suture portion 72 and the inner layer side suture portion 74 of the second embodiment.

Further, in the second embodiment, the number of cloth materials sewn by the outer layer side suture portion 72 is larger than the number of cloth materials sewn by the inner layer side suture portion 74. Not limited to this. The number of cloth materials sewn by the inner layer side suture portion 74 may be the same as the number of cloth materials sewn by the outer layer side suture portion 72. Alternatively, the number of cloth materials sewn by the inner layer side suture portion 74 may be larger than the number of cloth materials sewn by the outer layer side suture portion 72.

Further, in the second embodiment, the outer layer side suture portion 72 is formed at a position offset to the outside of the inner layer side suture portion 74, but the reverse configuration may be used.

Further, considering the problem to be solved by the present invention in terms of obtaining an airbag device capable of improving the heat resistance of the main body base cloth against the high temperature gas ejected from the inflator, in each of the above embodiments, The problem can be solved by omitting the configuration in which the stitched portions 68 and 70 are formed at a portion located on the front side of the seat with respect to the deformation region Q of the side airbag 32. In this case, the configuration of the present invention is "a main body base cloth formed in a bag shape, having an opening for fixing an inflator housed inside, and expanding and expanding by receiving a gas supply from the inflator, and the main body base. A plurality of cloth materials including an intermediate cloth arranged at least on the peripheral edge of the opening inside the cloth and arranged on the inner layer side and an inner cloth arranged on the inner layer side of the intermediate cloth are layered. The additional cloth, the outer layer side suture portion for sewing the main body base cloth and the intermediate cloth so as to surround the opening, and the outer layer side suture portion formed at an offset position with respect to the suture line and the opening. An airbag device having a sutured portion including an inner layer side sutured portion that sews the intermediate cloth and the inner cloth so as to surround the portion. " Further, the configuration of the present invention is not limited to side airbags, and can solve similar problems assumed for front airbags, curtain airbags, and the like.

14 Vehicle seat 18 Seat back 24 Seat back frame (seat frame)
30 Side airbag device 32 Side airbag 34 Inflator 34A Gas ejection part 34B Stud bolt 36 Rectifying cloth 36A Upper end opening (opening)
36B lower end opening (opening)
58A Inner cloth 60A Inner cloth 60B Intermediate cloth 68 Suture part 70 Suture part 72 Outer layer side suture part 74 Inner layer side suture part Q Deformation area

Claims (5)

In the side portion of the seat back of the vehicle seat on the outer side in the seat width direction, the seat is provided so as to face the side surface of the seat frame, and is fixed to the seat frame by using stud bolts. Inflator to generate and
It is formed in a bag shape, has a through hole through which the stud bolt of the inflator housed inside and at the rear end in the front-rear direction of the seat penetrates, is fixed to the seat frame by using the stud bolt, and is fixed to the seat frame by the gas. A side airbag that expands and expands to the front and above the seat,
A rectifying cloth arranged inside the side airbag to cover the circumference of the inflator and fixed to the seat frame by using the stud bolt of the inflator.
In the expanded and deployed state of the side airbag, the through hole is surrounded at a position on the rear side of the seat of the inflator and on the front side of the seat with respect to the deformed region of the side airbag located near the gas ejection portion of the inflator. The side airbag, the sewn part where the rectifying cloth is sewn, and
A side airbag device equipped with. The rectifying cloth is formed by layering a plurality of cloth materials including at least an intermediate cloth arranged inside the side airbag and an inner cloth arranged on the inner layer side of the intermediate cloth.
The suture portion is formed at a position offset from the suture line of the outer layer side suture portion and the outer layer side suture portion for suturing the side airbag and the intermediate cloth so as to surround the through hole, and the penetration portion. An inner layer side suture portion for suturing the intermediate cloth and the inner cloth so as to surround the hole is provided.
The side airbag device according to claim 1. The rectifying cloth has a configuration in which the number of cloth materials sewn by the outer layer side suture portion is larger than the number of cloth materials sewn by the inner layer side suture portion.
The side airbag device according to claim 2. The rear end portion in the front-rear direction of the seat in the suture portion is formed at a position where the outer layer side suture portion is offset to the rear side of the seat with respect to the inner layer side suture portion.
The side airbag device according to claim 2 or 3. The rectifying cloth is formed in a tubular shape in which the early inflator is housed, and the early gas supplied from the inflator is supplied to the inside of the side airbag through an opening formed at an axial end. Is configured to
The rectifying cloth is a rectifying suture in which the innermost cloth arranged on the innermost layer side in contact with the inflator and the cloth material on the outer layer side of the innermost cloth are sewn in the vicinity of the gas ejection portion of the inflator in the previous period. The part is formed,
The side airbag device according to any one of claims 2 to 4.