JP5998978B2 - Side airbag device for vehicle - Google Patents

Description

  The present invention relates to a vehicle side airbag device that restrains a seated occupant by a side airbag during a side collision of the vehicle.

  In the side airbag device for a vehicle shown in FIG. 14 of Patent Document 1 below, the side airbag is partitioned into an upper chamber and a lower chamber by a partition wall. The upper chamber includes a rear tube bag portion and a front tube bag portion communicated with each other at the narrowed communication portion. In addition, the upper end portion of the inflator is located in the rear tube bag portion, and the lower end portion of the inflator is located in the lower chamber. The gas ejected from the inflator is supplied to the lower chamber and the rear tube bag portion, and is also supplied to the front tube bag portion through the communicating portion. Thus, when this side airbag is inflated and deployed, the front part of the seat occupant's chest and abdomen are restrained by the front tube bag part, and the shoulder part, the chest part and the rear part of the seat occupant are restrained by the rear tube bag part. The waist of the seated occupant is restrained by the lower chamber.

  In the vehicle side airbag device described above, the partition wall between the upper chamber and the lower chamber is disposed at the vertical position corresponding to the abdomen of the seated occupant when the side airbag is inflated and deployed, so that it is relatively resistant. While restraining the shoulder and waist of a seated occupant with a side airbag by a side airbag, the restraining force received from the side airbag by the abdomen of the seated occupant having relatively low resistance can be reduced. In this vehicle side airbag device, the internal pressure of the lower chamber that restrains the waist of the seated occupant can be set higher than the internal pressure of the upper chamber.

JP 2010-1332072 A

  However, in the vehicle side airbag device described above, when the lower part of the seated occupant is restrained early and at a higher pressure by the lower chamber, the gas supply to the upper part of the rear tube bag part may be delayed. is there. Moreover, since the upper portion of the rear tube bag portion is formed so as to restrain only the rear portion of the shoulder portion, there is a possibility that the shoulder portion cannot be restrained early and effectively, and there is room for improvement. .

  The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a vehicle side airbag device that can quickly and effectively restrain the seated occupant's shoulder while securing the restraining performance of the seated occupant's waist. .

A side airbag device for a vehicle according to a first aspect of the present invention is provided on a side portion on the vehicle width direction outer side of a seat back of a vehicle seat, and is activated when a side collision of the vehicle is detected or predicted. An inflator that ejects gas, a lower bag portion that is provided on the side and restrains the waist of the seated occupant, a front bag portion that restrains the chest and the front of the seated occupant, and a shoulder and chest of the seated occupant And a rear bag part that restrains the rear part of the abdomen, and an inflator housing chamber in which the inflator is housed is defined in a rear part in the rear bag part, and a gas ejected from the inflator, The lower bag portion is supplied from the lower end opening of the inflator housing chamber into the lower bag portion, and the upper shoulder opening of the rear bag portion from the upper end opening of the inflator housing chamber. Is further supplied into the front bag portion through the communication port between the front bag portion and the rear bag portion, and is inflated and deployed, and the shoulder restraint portion is located in front of the vehicle above the front bag portion. comprising a Lusa id airbag extending to the side, and the partition portion for partitioning the front bag portion and the said rear bag portion, and a vertical partition portion in the inflated and deployed state extending in the vertical direction of the seatback, the expansion An upper partition portion extending obliquely upward and forward of the seat back in the unfolded state, and the shoulder restraint portion is partitioned from the front bag portion by the upper partition portion .

  Note that the front-rear and up-down directions described in claim 1 are directions when the side airbag is inflated and deployed, and correspond to the front-rear and up-down directions of the vehicle.

  In the first aspect of the present invention, the side airbag is partitioned into a lower bag portion, a front bag portion, and a rear bag portion. An inflator accommodating chamber that accommodates the inflator is defined in the rear part in the rear bag part, and the inflator is activated when a side collision of the vehicle is detected or predicted. Then, the gas ejected from the inflator is supplied from the lower end opening of the inflator housing chamber into the lower bag portion, and from the upper end opening of the inflator housing chamber to the upper shoulder restraining portion of the rear bag portion. It is supplied into the front bag portion from the communication port between the bag portion and the rear bag portion. As a result, the side airbag is inflated and deployed, the lower part of the seat occupant's waist is restrained by the lower bag part, the front part of the chest and abdomen of the seated occupant are restrained by the front side bag part, and the shoulder, chest and abdomen of the seated occupant The rear part is restrained by the rear bag part.

Here, in the present invention, as described above, the gas ejected from the inflator is supplied from the lower end opening of the inflator accommodating chamber into the lower bag portion, and from the upper end opening of the inflator accommodating chamber to the upper portion of the rear bag portion. Supplied to the shoulder restraint. Thus, not only the lower bag portion that restrains the waist of the seated occupant, but also the shoulder restraint portion of the rear bag portion that restrains the shoulder of the seated occupant can be inflated and deployed early and at a higher pressure. And since the shoulder restraint part of a rear side bag part is extended to the vehicle front side above the front side bag part, the restraint area of the shoulder part by a shoulder restraint part can be expanded. From the above, it becomes possible to quickly and effectively restrain the seated occupant's shoulder while securing the restraining performance of the seated occupant's waist.
Furthermore, in the present invention, the shoulder restraint portion provided on the upper portion of the rear bag portion is partitioned from the front bag portion by the upper partition portion that extends obliquely upward and forward of the seat back when the side airbag is inflated and deployed. That is, by setting the upper partition portion that extends upward in the front-rear direction of the seat back, the upper portion of the rear bag portion extends above the front bag portion and restrains the shoulder of the seated occupant. By setting the upper partition portion in this way, it is possible to satisfactorily expand the restraint area of the shoulder portion by the shoulder restraint portion while suppressing an increase in the capacity of the rear bag portion.
Further, in the inflated and deployed state of the side airbag, since the vicinity of the upper partition portion is suppressed from being expanded, the upper side of the front side bag portion on the inner side surface in the vehicle width direction is directed outward in the vehicle width direction. And can be curved to rise. As a result, when the side airbag and the seated occupant relatively approach each other due to the impact of the side collision, the curved surface and the upper arm of the seated occupant are brought into sliding contact with each other, and an upward pushing force acts on the upper arm. Can be made. As a result, the upper arm portion can be pushed up above the front bag portion and restrained by the shoulder restraint portion, so that the upper arm portion can be suppressed from being interposed between the chest of the seated occupant and the side airbag, The load can be reduced.

  A side airbag device for a vehicle according to a second aspect of the present invention is the vehicle side airbag device according to the first aspect, wherein the side airbag is moved from the lower bag portion to the rear bag portion by an increase in internal pressure of the lower bag portion. A check valve is provided to restrict the gas flow.

  According to the second aspect of the present invention, the lower back portion of the side airbag is restrained by the lower back portion of the side airbag, which has higher load resistance than the shoulder, chest and abdomen of the seated occupant. And by the internal pressure rise of this lower side bag part, a non-return valve restrict | limits the gas flow from the inside of a lower side bag part into the back side bag part (including the case where it interrupts | blocks completely). As a result, since the internal pressure of the lower bag portion can be maintained at a high level from the initial stage of restraint to the late stage of restraint, the restraining performance of the lower back portion by the lower bag part can be improved.

The vehicle side airbag device according to a third aspect of the present invention is the vehicle side airbag device according to the first or second aspect , wherein the upper end opening of the inflator housing chamber is positioned above the communication port in the inflated and deployed state. Is provided.

In the third aspect of the present invention, since the structure is as described above, a part of the gas ejected from the upper end opening of the inflator housing chamber does not pass through the shoulder restraining portion at the upper portion of the rear bag portion. It is possible to prevent or suppress the supply from the communication port between the front bag portion and the rear bag portion into the front bag portion. Thereby, it becomes possible to inflate and deploy the shoulder restraint portion earlier and at a high pressure, and the restraint performance of the shoulder portion by the shoulder restraint portion can be improved.

A vehicle side airbag device according to a fourth aspect of the present invention is the vehicle side airbag device according to any one of the first to third aspects, wherein the inflator housing chamber is reduced in diameter from the lower end opening toward the upper end opening. Is formed.

In the invention according to claim 4 , since the inflator accommodating chamber is formed as described above, the flow velocity of the gas ejected from the upper end opening of the inflator accommodating chamber can be increased, and the supply of gas to the shoulder restraint portion Can be promoted.

  As described above, in the vehicle side airbag device according to the present invention, the shoulder portion of the seated occupant can be restrained early and effectively while ensuring the restraining performance of the waist portion of the seated occupant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a vehicle seat on which a vehicle side airbag device according to a first embodiment of the present invention is mounted, and is a view of a state in which the side airbag is inflated and deployed. It is an enlarged side view which expands and shows the side airbag. It is an expanded sectional view which expands and shows the cut surface along the F3-F3 line of FIG. It is an expanded sectional view which expands and shows the cut surface along the F4-F4 line | wire of FIG. FIG. 3 is an enlarged cross-sectional view showing an enlarged cut surface along the line F5-F5 in FIG. 2. It is a side view corresponding to Drawing 2 showing the state where the side air bag was inflated and deployed in the side air bag device for vehicles concerning a 2nd embodiment of the present invention. It is an expanded sectional view which expands and shows the cut surface along the F7-F7 line | wire of FIG.

<First Embodiment>
A vehicle side airbag device 10 according to a first embodiment of the present invention will be described with reference to FIGS. It should be noted that arrows FR, UP, and OUT appropriately shown in the drawings respectively indicate the front direction (traveling direction), the upward direction, and the outside in the vehicle width direction of the vehicle. Hereinafter, when the description is made simply using the front-rear direction and the up-down direction, the front-rear direction of the vehicle and the up-down direction of the vehicle are indicated unless otherwise specified.

(Constitution)
As shown in FIG. 1, the side airbag device 10 according to the first embodiment includes a door-side side portion 14 </ b> A (a side portion on the outer side in the vehicle width direction) of the seat back 14 in the vehicle seat 12. It is mounted on the side door 56 side). The seat back 14 is connected to the rear end portion of the seat cushion 16 so as to be tiltable, and a headrest 18 is connected to the upper end portion.

  In the present embodiment, the front-rear direction, the left-right direction (width direction), and the up-down direction of the vehicle seat 12 coincide with the front-rear direction, left-right direction (width direction), and up-down direction of the vehicle. In FIG. 1, a crash test dummy P is seated on the vehicle seat 12 instead of an actual occupant. This dummy P is, for example, WorldSID (World Side Impact Dummy) AM50 (a model covering 50% of American adult males). Hereinafter, the dummy P is referred to as a “seat occupant P” for easy understanding.

  The side airbag device 10 includes a side airbag 20 and an inflator 22 (gas generating means) that generates gas in the side airbag 20 as main parts. The side airbag 20 is disposed (stored) inside the door side portion 14A in a state of being folded and unitized (modulated) together with the inflator 22 and the like, and is seated by the pressure of the gas generated from the inflator 22 Inflated and deployed between the occupant P and the side door 56 (see FIG. 4) (as shown in FIG. 1). At the time of the inflation and deployment, the seat back pad and the seat skin (both not shown) disposed on the door side portion 14A are configured to be broken by receiving the inflation pressure of the side airbag 20. Note that the front and rear, upper and lower directions of the side airbag 20 described in the following description indicate directions in a state where the side airbag 20 is inflated and deployed unless otherwise specified. It almost coincides with the direction.

  As shown in FIGS. 1 to 5, the side airbag 20 is a so-called three-chamber side airbag, and the front bag portion 24, the rear bag portion 26, and the lower bag portion 28 are integrally sewn. Has been configured. The rear bag portion 26 is formed by sewing one base cloth 30 formed by cutting out a nylon or polyester cloth material, for example. The base fabric 30 is folded in two along the fold line K, and the one side portion 30A and the other side portion 30B via the fold line K are sewn at the front edge at the sewing portion T1, and the side airbag 20 The upper edge is sewn at the outer periphery sewing portion T2 set at the outer periphery. Moreover, the lower end edge part of 30 A of 1 side parts and the other side part 30B is mutually sewn in the sewing part T6 (refer FIG. 4). In FIGS. 1 and 2, the sewing parts T1, T2, and T6 and sewing parts T3 to T5, T7, and T8 described later are not shown.

  The front bag portion 24 is formed by sewing two base cloths 32 and 34 made of the same cloth material as the base cloth 30. These base cloths 32 and 34 have their front end edges sewn at the outer peripheral sewing part T2, and the front end parts of the rear bag part 26 are sandwiched between the rear end edges of these base cloths 32 and 34. ing. The rear edge portions of the base fabrics 32 and 34 are sewn to the front end portion of the rear bag portion 26 at the sewing portions T3 and T4. Moreover, the lower end edge part of the base fabrics 32 and 34 is mutually sewn in the sewing part T6.

  The lower bag portion 28 is formed by sewing two base fabrics 36 and 38 made of the same fabric material as the base fabric 30. These base fabrics 36 and 38 are sewn at the lower edge at the outer periphery sewing portion T2. Further, the lower end portions of the front bag portion 24 and the rear bag portion 26 are sandwiched between the upper edge portions of the base fabrics 36 and 38, and the base fabric 32 and the one side portion 30A and the base fabric 36 are sewn at the sewing portion T7. Are sewn, and the base cloth 34, the other side portion 30B, and the base cloth 38 are sewn at the sewing portion T8.

  As shown in FIGS. 1 and 2, the side airbag 20 is formed to have a substantially oval shape that is long along the seat back vertical direction when the inflated and deployed state is viewed from the side. The shoulder S, the chest C, the abdomen B, and the waist L of the seated occupant P are set so as to be restrained. In the inflated and deployed state, the front bag portion 24 and the rear bag portion 26 are arranged in the vehicle front-rear direction, and the lower bag portion 28 is disposed below the front bag portion 24 and the rear bag portion 26.

  The front bag portion 24 and the rear bag portion 26 are a partition portion 40 (tether portion) formed by a part of the base fabric 30 (the front end portion of the rear bag portion 26) disposed inside the side airbag 20. It is partitioned by. The partition portion 40 includes a vertical partition portion 40A extending along the vertical direction of the seat back 14 and an upper partition portion 40B (inclined partition portion) extending obliquely upward and forward of the seat back 14 from the upper end of the vertical partition portion 40A. It is configured.

  Further, the front bag portion 24 and the rear bag portion 26 and the lower bag portion 28 are a part of the base fabrics 32 and 34 (the lower end portion of the front bag portion 24) disposed inside the side airbag 20, and It is partitioned by a lower partition portion 42 (tether portion) formed by a part of the one side portion 30A and the other side portion 30B (the lower end portion of the rear bag portion 26). The interior of the front bag portion 24 is a front chamber 46, the interior of the rear bag portion 26 is a rear chamber 48, and the interior of the lower bag portion 28 is a lower chamber 50.

  In addition, the manufacturing method of the side airbag 20 is not restricted above, and can be changed as appropriate. For example, a bag body is formed by folding a single base fabric in half and sewing the outer peripheral edge portion, and the bag body is sewn to a sewing portion (seam corresponding to an upper partition portion, a vertical partition portion, and a lower partition portion). ) May be used to manufacture a side airbag by partitioning into a front bag portion, a rear bag portion, and a lower bag portion. Further, for example, the vertical partition and the lower partition may be configured by a tether, and the upper partition may be configured by a seam (sewing unit), and the configuration of the partition can be changed as appropriate.

  As shown in FIGS. 1 and 2, the front chamber 46 and the rear chamber 48 are communicated with each other via a communication port 52 formed in the vertical partition 40A. In addition, an inflator accommodating chamber 60 in which the inflator 22 is accommodated is defined in the rear portion of the rear bag portion 26. The inflator housing chamber 60 has an axial direction of the side airbag 20 when the one side portion 30A and the other side portion 30B of the base fabric 30 are sewn together at a sewing portion T9 extending in the vertical direction of the side airbag 20. It is formed in a cylindrical shape along the vertical direction.

  As shown in FIG. 2, the inflator housing chamber 60 communicates with the upper portion of the rear chamber 48 through an upper end opening 60 </ b> A disposed at the upper portion of the rear chamber 48. Further, as shown in FIG. 5, the above-described sewing portion T6 (see FIG. 4) is not set on the lower end side of the inflator accommodating chamber 60, and between the lower end portions of the one side portion 30A and the other side portion 30B. The inflator housing chamber 60 and the lower chamber 50 are communicated with each other through the set lower end opening 60B. The lower end portions of the one side portion 30A and the other side portion 30B extend downward and protrude into the lower chamber 50, and the check valve 62 is configured by the protruding portion.

  The inflator 22 is a so-called cylinder type inflator and is formed in a cylindrical shape. The inflator 22 is disposed in the inflator accommodating chamber 60 in a state where the axial direction is along the vertical direction of the seat back 14. A pair of upper and lower stud bolts (not shown) protrude from the outer periphery of the inflator 22 toward the vehicle rear side. These stud bolts penetrate the base cloth 30 and penetrate a bracket (not shown) fixed to the side frame 15A of the seat back frame 15, and a nut (not shown) is screwed to the tip side. Thereby, the inflator 22 is fastened and fixed (so-called back tightening) to the side frame 15 </ b> A together with the side airbag 20. Note that a stud bolt that protrudes inward in the vehicle width direction from the outer periphery of the inflator 22 may pass through the base cloth 30 and the side frame 15A and be screwed into a nut (so-called side tightening).

  A gas ejection portion 22 </ b> A is provided at the upper end portion or the lower end portion (here, the lower end portion) of the inflator 22. A plurality of gas jets arranged in the circumferential direction of the inflator 22 are formed in the gas jet part 22A, and when the inflator 22 is operated, gas is jetted radially from the plurality of gas jets. A side collision ECU 90 (see FIG. 1) mounted on the vehicle is electrically connected to the inflator 22. A side collision sensor 92 that detects a side collision is electrically connected to the side collision ECU 90. The side collision ECU 90 is configured to operate the inflator 22 when a side collision (inevitable) is detected based on a signal from the side collision sensor 92. When a pre-crash sensor for predicting (predicting) a side collision is electrically connected to the side collision ECU 90, an inflator is used when the side collision ECU 90 predicts a side collision based on a signal from the pre-crash sensor. 22 may be configured to be operated.

  In the side airbag device 10 configured as described above, when the inflator 22 is operated, the gas ejected from the gas ejection part 22A of the inflator 22 is ejected up and down from the upper end opening 60A and the lower end opening 60B of the inflator housing chamber 60. . The gas ejected from the upper end opening 60A is ejected (distributed) toward the upper portion of the rear chamber 48 (see arrow G1 in FIG. 2). Further, the gas ejected from the lower end opening 60B is ejected (distributed) to the lower chamber 50 (see arrow G2 in FIG. 2). Further, a part of the gas ejected toward the upper portion of the rear chamber 48 is distributed to the lower portion of the rear chamber 48 and distributed to the lower portion of the front chamber 46 through the communication port 52 (the arrow in FIG. 2). (See G3).

  As a result, the front bag portion 24, the rear bag portion 26, and the lower bag portion 28 (that is, the side airbag 20) are inflated and deployed between the seat occupant P and the door trim 58 (vehicle body side portion) of the side door 56. The front bag part 24 restrains the chest C and the front part of the abdomen B (front half: front side) of the seated occupant P, and the rear part of the shoulder S, the chest C and the abdomen B of the seated occupant P by the rear bag part 26. (Second half: rear side) is restrained, and the lower bag portion 28 restrains the waist L of the seated occupant P. Hereinafter, the inflated and deployed state of the side airbag 20 will be described in detail.

  40 A of vertical partition parts are provided so that it may extend in the seat back up-down direction along the front-back direction center part of the chest C and the abdominal part B of the seated passenger P. In the vicinity of the vertical partition portion 40A, as shown in FIG. 3, the inner side surface in the vehicle width direction of the side airbag 20 is recessed outward in the vehicle width direction to form a recess 64. The recess 64 extends in the vertical direction of the seat back along the vertical partition 40A. The concave portion 64 is opposed to the front-rear direction center of the chest C and the abdomen B (that is, the portion that protrudes most outward in the vehicle width direction).

  On the other hand, the upper partition 40B is provided so as to extend obliquely upward and forward of the seat back 14 from the upper end of the vertical partition 40A. That is, the upper partition portion 40B is formed in a direction (indicated by the dashed line X in FIG. 2) perpendicular to the front-back direction of the seat back 14, that is, in the seat side view, in the vertical direction of the seat back 14 (the direction along the dashed line Y in FIG. Incline so as to rise toward the front side of the seat back 14. The vertical direction of the seat back 14 is a direction connecting the front-rear direction center of the upper end portion of the seat back frame 15 and the axis of the reclining rod 66. In addition, the inclination angle θ of the upper partition portion 40B with respect to the front-rear direction of the seat back 14 is preferably in the range of 30 to 60 degrees, and more preferably in the range of 40 to 50 degrees.

  When the inflated and deployed state of the side airbag 20 is viewed from the vehicle width direction, the upper partition portion 40B has a center O of the shoulder S of the seated occupant P and a longitudinal center of the upper arm A (the center of gravity of the upper arm A). It is set to be located in the vicinity of the center between the AC position or the position in the vicinity of the center of gravity AC). By setting the upper partition portion 40B, a shoulder restraining portion 26A partitioned from the front bag portion 24 is formed on the upper portion of the rear bag portion 26. In the present embodiment, the position of the upper end opening 60A of the inflator accommodating chamber 60 is set so that the gas G1 is ejected toward the shoulder restraining portion 26A. The shoulder restraining portion 26A is inflated and deployed toward the vehicle front side above the front bag portion 24 and restrains the shoulder portion S of the seated occupant P.

  Further, in the vicinity of the upper partition portion 40B, as shown in FIG. 4, the inner side surface in the vehicle width direction of the side airbag 20 is recessed outward in the vehicle width direction, and a recess 68 is formed. The recess 68 extends so as to extend obliquely upward and forward of the seat back 14 along the upper partition 40B. Further, the inner side surface of the front bag portion 24 in the vehicle width direction is curved so that the upper side of the front side in the vertical direction rises toward the outer side in the vehicle width direction.

  On the other hand, the lower partition 42 is provided to extend in the vehicle front-rear direction at a height between the abdomen B and the waist L of the seated occupant P. The lower bag portion 28 partitioned from the front bag portion 24 and the rear bag portion 26 by the lower partition portion 42 has a length dimension in the vehicle front-rear direction longer than the waist portion L of the seated occupant P. L is constrained in a wide range in the vehicle longitudinal direction.

  In the present embodiment, a part of the gas G1 supplied from the upper end opening 60A of the inflator accommodating chamber 60 into the shoulder restraining portion 26A (in the rear bag portion 26) passes through the communication port 52 of the vertical partitioning portion 40A. Is supplied into the front bag portion 24 (see gas G3 in FIG. 2). That is, since gas is supplied into the front bag portion 24 through the rear bag portion 26, the internal pressure P1 of the front bag portion 24 is lower than the internal pressure P2 of the rear bag portion 26. (P1 <P2).

  Further, in the present embodiment, when gas is ejected from the lower end opening 60B of the inflator accommodating chamber 60 into the lower bag portion 28, when the internal pressure of the lower bag portion 28 exceeds a preset value, a check is performed. The valve 62 is crushed and closed by the internal pressure of the lower bag portion 28 (see the two-dot chain line in FIG. 5). Thereby, the gas flow from the lower bag portion 28 into the rear bag portion 26 is restricted. As a result, the internal pressure P3 of the lower bag portion 28 is maintained at a higher level than the internal pressure P2 of the rear bag portion 26 from the early stage of restraint to the late stage of restraint of the seated occupant P (P2 <P3).

  A vent hole that allows the inside of the front bag portion 24 and the outside of the side airbag 20 to communicate with each other is set at the front edge of the front bag portion 24, etc., and the gas supplied into the front bag portion 24 is transferred to the vent hole. A configuration may be adopted in which the air is exhausted from. Thereby, when the seated occupant P is restrained by the side airbag 20, it is possible to prevent or suppress the occurrence of the remaining collapse in the front bag portion 24. Although this point is the same also in the rear bag part 26 and the lower bag part 28, it is preferable to comprise so that the internal pressure of each bag part may become said relationship (P1 <P2 <P3).

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

  In the side airbag device 10 having the above configuration, when the side collision ECU 90 detects a side collision by a signal from the side collision sensor 92, the inflator 22 is operated by the side collision ECU 90. Then, the gas ejected from the inflator 22 is supplied into the lower bag portion 28 from the lower end opening 60B of the inflator housing chamber 60, and the upper shoulder of the rear bag portion 26 from the upper end opening 60A of the inflator housing chamber 60. It is supplied into the restraining portion 26 </ b> A and further supplied into the front bag portion 24 from the communication port 52 between the front bag portion 24 and the rear bag portion 26. As a result, the side airbag 20 is inflated and deployed, the waist L of the seated occupant P is restrained by the lower bag portion 28, and the front portion of the chest C and the abdomen B of the seated occupant P is restrained by the front bag portion 24. The shoulder portion S of the occupant P and the rear portions of the chest portion C and the abdominal portion B are restrained by the rear bag portion 26.

  Here, in the present embodiment, as described above, the gas ejected from the inflator 22 is supplied from the lower end opening 60B of the inflator accommodating chamber 60 into the lower bag portion 28, and the upper end opening of the inflator accommodating chamber 60 is provided. 60A is supplied to the shoulder restraining portion 26A of the rear bag portion 26. Thus, not only the lower bag portion 28 that restrains the waist L of the seated occupant P, but also the shoulder restraint portion 26A that restrains the shoulder S of the seated occupant P can be inflated and deployed early and at a higher pressure. In addition, since the shoulder restraining portion 26A extends to the vehicle front side above the front bag portion 24, the restraining area of the shoulder S by the shoulder restraining portion 26A can be enlarged, and the center O of the shoulder S is defined as the shoulder restraining portion. It can be restrained well by 26A. From the above, it is possible to restrain the shoulder S of the seated occupant P early and effectively while securing the restraining performance of the waist L of the seated occupant P.

  Further, in the present embodiment, the shoulder restraining portion 26A and the lower bag portion 28 of the rear bag portion 26 can be inflated and deployed at an early stage, so that the space between the shoulder portion S and the waist portion L of the seated occupant P and the door trim 58 can be increased. The shoulder restraining portion 26A and the lower bag portion 28 can be interposed in the narrow gap at an early stage. Moreover, since the internal pressure P1 of the front bag portion 24, the internal pressure P2 of the rear bag portion 26, and the internal pressure P3 of the lower bag portion 28 are configured to have a relationship of P1 <P2 <P3, the seat occupant P The shoulder S to the waist L can be appropriately restrained by the restraining force according to the load resistance of each part.

  In the present embodiment, the check valve 62 restricts the flow of gas from the lower bag portion 28 to the rear bag portion 26 (inflator housing chamber 60) due to the increase in the internal pressure of the lower bag portion 28. As a result, since the internal pressure of the lower bag portion 28 can be maintained in a high state from the initial stage of restraint to the late stage of restraint, the restraining performance of the waist L by the lower bag part 28 can be improved.

  Further, in the present embodiment, the shoulder restraining portion 26A of the rear bag portion 26 is partitioned from the front bag portion 24 by an upper partition portion 40B that extends obliquely upward and forward of the seat back 14 from the upper end of the vertical partition portion 40A. Inflate and deploy to the upper side of the front bag portion 24. That is, by setting the upper partition portion 40 </ b> B extending upward in the front-rear direction of the seatback 14, the upper portion (shoulder restraining portion 26 </ b> A) of the rear bag portion 26 extends to the upper side of the front bag portion 24. The shoulder S of the seated occupant P is restrained. By setting the upper partition portion 40B in this manner, the restraining area of the shoulder portion S by the shoulder restraining portion 26A can be favorably expanded while suppressing an increase in the capacity of the rear bag portion 26.

  Further, as shown in FIG. 4, the inner side surface in the vehicle width direction of the inflated front bag portion 24 is curved so that the upper side of the front side in the vertical direction rises toward the outer side in the vehicle width direction. For this reason, when the side airbag 20 and the seated occupant P relatively approach each other due to the impact of the side collision, the curved surface and the upper arm portion A of the seated occupant P are in sliding contact with each other, and the upper arm portion A is pushed upward. A force F is generated. As a result, the upper arm portion A is pushed up above the front bag portion 24 and is restrained by the shoulder restraining portion 26A. Thereby, since it can suppress that the upper arm part A intervenes between the chest C of the seated crew member P and the side airbag 20, the load on the chest C can be reduced.

  In the present embodiment, the upper end opening 60 </ b> A of the inflator accommodating chamber 60 is positioned above the communication port 52 between the front bag portion 24 and the rear bag portion 26 in the inflated and deployed state of the side airbag 20. It is provided as follows. For this reason, a part of the gas ejected from the upper end opening 60A is supplied from the communication port 52 into the front bag portion 24 without passing through the rear bag portion 26 shoulder restraining portion 26A (the front bag portion 24). Gas) can be prevented or suppressed. Thereby, it becomes possible to inflate and deploy the shoulder restraint portion 26A at an early stage and high pressure, and the restraint performance of the shoulder portion S by the shoulder restraint portion 26A can be improved.

  In the present embodiment, the upper partition portion 40B is configured such that the center of the shoulder portion S of the seated occupant P and the central portion in the longitudinal direction of the upper arm portion A (when the inflated and deployed state of the side airbag 20 is viewed from the vehicle width direction ( It is located near the center between the upper arm portion A and the center of gravity AC). For this reason, compared with the case where the upper partition part 40B is set near the center of gravity AC of the upper arm part A, the pushing force F of the upper arm part A by the front bag part 24 is better near the center of gravity AC of the upper arm part A. Can act. Thereby, it becomes possible to push up the upper arm part A effectively.

  Further, in the present embodiment, the vertical partition 40A has a seat back along the longitudinal center of the chest C and the abdomen B of the seated occupant P when the inflated and deployed state of the side airbag 20 is viewed from the vehicle width direction. It is set to extend in the vertical direction. For this reason, the front bag part 24 and the rear bag part 26 can restrain the side surface of the chest C and the abdomen B of the seated occupant P from the front and back along the curve. Thereby, the positional relationship of the chest C and abdomen B and the side airbag 20 in the vehicle front-rear direction can be stabilized.

  Further, in the present embodiment, when the side airbag 20 is inflated and deployed, the inner side surface in the vehicle width direction of the side airbag 20 is recessed outward in the vehicle width direction in the vicinity of the vertical partition portion 40A and the upper partition portion 40B. In the concave portion 64 formed in the vicinity of the vertical partitioning portion 40A, the center portion in the front-rear direction on the side surface of the chest C (that is, the portion that protrudes most outward in the vehicle width direction) is fitted. Thereby, the load to the chest C (such as ribs) can be reduced. Further, the upper arm portion A pushed up by the sliding contact with the front bag portion 24 is fitted into the concave portion 68 formed in the vicinity of the upper partition portion 40B. Thereby, the upper arm part A can be favorably restrained at the pushed-up position.

  In the present embodiment, the front bag portion 24 and the rear bag portion 26 are partitioned by a partition portion 40 (tether portion) formed by a part of the base fabric 30, and the front bag portion 24 and the rear side portion are separated. The bag part 26 and the lower bag part 28 are partitioned by a lower partition part 42 (tether part) formed by a part of the base fabrics 30, 32, 34. For this reason, the inflated thickness (dimension in the vehicle width direction in the inflated and deployed state) of the front bag portion 24, the rear bag portion 26, and the lower bag portion 28 can be increased by the width dimension of each tether portion. Thereby, the shock absorption stroke of the front bag part 24, the rear bag part 26, and the lower bag part 28 can be ensured satisfactorily.

  Next, another embodiment of the present invention will be described. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

<Second Embodiment>
FIG. 6 is a side view showing an inflated and deployed state of the side airbag 100 in the vehicle side airbag device according to the second embodiment of the present invention. In the side airbag 100, the sewing portion T9 according to the first embodiment is not set, and a rectifying cloth 102 is provided at the rear portion in the rear bag portion 26. The rectifying cloth 102 is formed in a cylindrical shape by sewing a base cloth 104 (see FIG. 7) made of the same cloth material as the base cloth 30 and the like at the sewing portion T10. The rectifying cloth 102 is disposed on the lower side of the rear portion in the rear bag portion 26 with the axial direction along the vertical direction of the seat back 14. The lower end portion of the rectifying cloth 102 is inserted between the lower end edge portion of the one side portion 30 </ b> A and the lower end edge portion of the other side portion 30 </ b> B in the base fabric 30 and protrudes into the lower bag portion 28. This protruding portion constitutes a check valve 106 (see FIG. 6).

  The inside of the rectifying cloth 102 is an inflator accommodating chamber 108 that accommodates the inflator 22. The inflator accommodating chamber 108 is communicated with the shoulder restraining portion 26 </ b> A via an upper end opening 108 </ b> A disposed at the upper portion in the rear bag portion 26. The inflator housing chamber 108 communicates with the lower bag portion 28 through a lower end opening 108B provided at the lower end portion of the check valve 106. Further, the inflator accommodating chamber 108 is formed so as to reduce in diameter in a taper shape from the lower end opening 108B toward the upper end opening 108A. In this embodiment, the configuration other than the above is the same as that of the first embodiment.

  Also in this embodiment, the gas ejected from the inflator 22 is supplied from the lower end opening 108B of the inflator accommodating chamber 108 into the lower bag portion 28, and from the upper end opening 108A of the inflator accommodating chamber 108 to the rear bag portion 26. To the shoulder restraint portion 26A. As a result, similarly to the first embodiment, the shoulder portion S of the seated occupant P can be restrained early and effectively while ensuring the restraining performance of the waist L of the seated occupant P.

  In addition, in this embodiment, since the inflator accommodating chamber 108 is formed to have a tapered diameter as it goes from the lower end opening 108B to the upper end opening 108A, the flow rate of the gas ejected from the upper end opening 108A can be increased. It is possible to promote the supply of gas to the shoulder restraining portion 26A. Further, since the inflator accommodating chamber 108 is formed by the flow rectifying cloth 102, compared with the first embodiment in which the inflator accommodating chamber 60 is formed by setting the sewing portion T9 (seam) in the rear bag portion 26. And the dimension (expansion thickness) of the vehicle width direction of the rear side bag part 26 in an expansion | deployment deployment state can be expanded. As a result, the impact absorbing stroke of the rear bag portion 26 can be increased.

<Supplementary explanation of the embodiment>
In the second embodiment, the inflator accommodating chamber 108 is configured to have a diameter that decreases from the lower end opening 108B toward the upper end opening 108A. However, the present invention is not limited to this, and the inflator accommodating chamber 108 has a lower end. You may make it the structure formed in the same diameter from the opening 108B to the upper end opening 108A. Further, the inflator housing chamber 60 in the first embodiment may be formed so as to reduce in diameter as it goes from the lower end opening 60B to the upper end opening 60A.

  In each of the above embodiments, the upper end openings 60A, 108A of the inflator accommodating chambers 60, 108 are connected to the communication port 52 between the front bag portion 24 and the rear bag portion 26 in the inflated and deployed state of the side airbag 20. However, the present invention is not limited to this, and the position of the communication port can be changed as appropriate.

  Furthermore, in the said embodiment, although the side airbags 20 and 100 were set as the structure provided with the check valves 62 and 106, this invention is not restricted to this, It is set as the structure by which the check valves 62 and 106 were abbreviate | omitted. Good.

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

DESCRIPTION OF SYMBOLS 10 Vehicle side airbag apparatus 12 Vehicle seat 14 Seat back 14A Door side side part (vehicle width direction outer side part)
DESCRIPTION OF SYMBOLS 20 Side airbag 22 Inflator 24 Front side bag part 26 Rear side bag part 26A Shoulder restraint part 28 Lower side bag part 40B Upper partition part 52 Communication port 60 Inflator accommodating part 60A Upper end opening 60B Lower end opening 62 Check valve 100 Side airbag 106 Check valve 108 Inflator storage chamber 108A Upper end opening 108B Lower end opening P Seated occupant S Shoulder C Chest B Abdomen L Lumbar

Claims (4)

An inflator that is provided on a side portion on the vehicle width direction outer side in the seat back of the vehicle seat, and is activated when a side collision of the vehicle is detected or predicted, and ejects gas;
A lower bag portion provided on the side portion for restraining the waist of the seated occupant, a front bag portion for restraining the front portion of the chest and abdomen of the seated occupant, and a shoulder portion of the seated occupant and the rear portion of the chest and abdomen. An inflator housing chamber in which the inflator is housed is partitioned and formed in a rear portion in the rear bag portion, and a gas ejected from the inflator is opened at a lower end of the inflator housing chamber. From the upper end opening of the inflator housing chamber to the upper shoulder restraint portion of the rear bag portion, and further between the front bag portion and the rear bag portion. and Lusa id airbag extends toward the vehicle front side is supplied from the communication port to said front bag portion to inflate and deploy, the upper side of the shoulder restraining section the front bag portion,
Equipped with a,
A partition part that partitions the front bag part and the rear bag part includes a vertical partition part that extends in a vertical direction of the seat back in the inflated and deployed state, and an upper part that extends obliquely forward and upward of the seat back in the inflated and deployed state. A vehicle side airbag device in which the shoulder restraint portion is partitioned from the front bag portion by the upper partition portion .   The vehicle according to claim 1, wherein the side airbag is provided with a check valve that restricts a gas flow from the lower bag portion to the rear bag portion by an increase in internal pressure of the lower bag portion. Side airbag device. 3. The vehicle side airbag device according to claim 1 , wherein an upper end opening of the inflator housing chamber is provided so as to be positioned above the communication port in the inflated and deployed state . The side airbag device for a vehicle according to any one of claims 1 to 3, wherein the inflator housing chamber is formed to have a diameter reduced from the lower end opening toward the upper end opening .

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