JP2017001534A - Air belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air belt device capable of preventing or suppressing an increase in the overall thickness of a bag body at a bending position of the folded bag body by a bending member.SOLUTION: Both side portions of a first wide part 48 of a bag body 42 in a width direction are folded to a strap belt 58 side in a thickness direction of the bag body 42 and are disposed between the strap belt 58 and a central portion of the first wide part 48 in the width direction. The first wide part 48 does not wrap the strap belt 58. Thus, a curvature radius at a bending portion of the folded first wide part 48 can be made small, generation of sagging at an inside portion in a curvature radius direction in the bending portion of the folded first wide part 48 can be reduced, and thereby the overall thickness dimension of the folded first wide part 48 due to the generation of sagging can be suppressed.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an air belt apparatus including a bag body that is inflated by the pressure of a fluid.

  A bag body folded on the thickness direction side of a belt-shaped member such as a webbing is provided, and fluid such as gas is supplied to the bag body in the event of a vehicle emergency, whereby the bag body is inflated on the front side of the occupant's body. There exists an air belt apparatus (refer the following patent document 1 as an example).

  By the way, in this type of air belt device, the bag body is bent together with the webbing and bent by bending members such as a shoulder anchor and a tongue. Here, if the folded bag body is arranged at the bending position of the bending member at the outer side in the radial direction of the bending curvature than the belt-like member, the bag body becomes loose, which causes the folding. The bag in the state becomes thick overall.

JP2015-54624A

  In view of the above facts, an object of the present invention is to obtain an air belt device capable of preventing or suppressing an increase in the overall thickness of a bag body at a bending position by a bending member of the folded bag body.

  The air belt device according to claim 1 is a belt-like member disposed on the vehicle front side of the occupant's body in a state of being attached to the occupant's body, a bending member that bends the belt-like member to one side in the thickness direction, The belt-shaped member is provided on one side in the thickness direction of the belt-shaped member, and is folded on one side in the thickness direction of the belt-shaped member so that the belt-shaped member can be inflated and deployed on the vehicle front side of the body of the passenger when the belt-shaped member is mounted on the body. A bag body that is folded and bent together with the belt-like member by a bending member.

  According to the air belt device of the first aspect, the belt-like member is bent to one side in the thickness direction by the bending member. On the other hand, the bag body is provided on one side in the thickness direction of the band-shaped member and is folded on one side in the thickness direction of the band-shaped member. For this reason, the radius of curvature of the bent portion bent by the bending member in the folded portion of the bag body can be reduced, and the occurrence of slack in the inner radius portion of the bent portion of the bag body can be reduced. An increase in the overall thickness dimension of the folded bag due to the occurrence can be suppressed.

  The air belt device according to claim 2 is the air belt device according to claim 1, wherein the belt-like member and the bag body are pulled out from the retracted state to the front end side in the longitudinal direction of the belt-like member rather than the bending member. Can be attached to the body of the occupant, and in the retracted state, the longitudinally proximal end portion of the bag body including the bending position of the bag body by the bending member is one side in the thickness direction of the belt-shaped member. Folded at.

  According to the air belt device of the second aspect, in the retracted state of the bag body, the longitudinal direction base end side portion of the bag body including the bending position by the bending member is on one side in the thickness direction of the belt-shaped member. Folded. For this reason, in the longitudinal direction base end side part of a bag body, generation | occurrence | production of the slack in the curvature radial direction inner part in the folding part of a bag body can be made small. For this reason, it is easy to draw the bag body together with the belt-like member toward the distal end side in the longitudinal direction.

  The inflatable belt device according to claim 3 is the inflatable belt device according to claim 1 or 2, wherein the belt-like member and the bag body are moved from the retracted state toward the front end side in the longitudinal direction of the belt-like member than the bending member. By being pulled out, it can be attached to the body of the occupant, and in the retracted state, the front end portion of the bag body in the longitudinal direction relative to the bending position by the bending member of the bag body is the thickness direction of the strip member. Folded to the other side.

  According to the air belt device of the third aspect, in the retracted state of the bag body, the front end portion in the longitudinal direction of the bag body is folded to the other side in the thickness direction of the belt-like member from the bending position of the bending member in the bag body. Be turned. The portion of the bag that is folded to the other side in the thickness direction of the belt-like member is not sandwiched between the belt-like member and the occupant's body. For this reason, in the stored state of the bag body, the front end portion in the longitudinal direction of the bag body is more easily expanded and deployed than the bending position of the bag body by the bending member.

  As described above, in the air belt device according to the present invention, an increase in the overall thickness of the bag body can be prevented or suppressed at the bending position by the bending member of the folded bag body.

1 is a front view of a seat belt device to which an air belt device according to a first embodiment is applied. It is a front view corresponding to FIG. 1 which shows the state by which the bag body was expanded and expand | deployed. It is a front view corresponding to FIG. 1 which shows the storing state of an air belt. It is sectional drawing of a through anchor and an air belt in the return position of an air belt in a through anchor. It is a top view of the air belt in the deployment state of a bag. It is a top view of the air belt in the folded state of a bag body. It is sectional drawing of the air belt cut | disconnected by the 7-7 line | wire of FIG. It is sectional drawing of the air belt cut | disconnected by the 8-8 line | wire of FIG. Schematic cross section of the folded portion at the through anchor of the air belt in which the widthwise both side portions of the first wide portion of the bag body are folded to the opposite side of the widthwise central side portion of the first wide portion with the strap belt interposed therebetween FIG. It is typical sectional drawing of the folding | turning part in the through anchor of the air belt by which the width direction both sides part of the 1st wide part of the bag was folded between the strap belt and the width direction center side part of the 1st wide part. . It is sectional drawing corresponding to FIG. 7 of the air belt which concerns on 2nd Embodiment.

  Next, a seat belt device 10 to which an air belt device 20 according to an embodiment of the present invention is applied will be described with reference to FIGS. In each figure, the arrow UP indicates the vehicle upper side on which the seat belt device 10 is mounted, the arrow FR indicates the vehicle front side, and the arrow OUT indicates the vehicle width direction outer side.

<Configuration of First Embodiment>
As shown in FIG. 1, the seat belt device 10 includes a winding device 12 as a storage unit. The winding device 12 is disposed on the vehicle width direction outer side of the vehicle seat 14 and on the vehicle lower side. The winding device 12 includes a frame, and the frame of the winding device 12 is fixed to the vehicle body. A spool 16 as a winding member is rotatably supported on the frame of the winding device 12, and the spool 16 is biased by a biasing force of a biasing means such as a spiral spring in a winding direction around the central axis. It is energized.

  Furthermore, the longitudinal direction proximal end side of the webbing 18 as a connecting member is locked to the spool 16, and when the spool 16 is rotated in the winding direction, the webbing 18 is wound around the spool 16. Further, the winding device 12 includes a lock mechanism (not shown), and the lock mechanism is activated in the event of a vehicle emergency such as a vehicle collision. When the lock mechanism is activated, the lock mechanism prevents the spool 16 from rotating in the pulling direction opposite to the winding direction. Furthermore, the winding device 12 includes a pretensioner (not shown), and the pretensioner is activated in the event of a vehicle emergency such as a vehicle collision. When the pretensioner is activated, the spool 16 is rotated in the winding direction, whereby the webbing 18 is wound on the spool 16.

  The webbing 18 extends from the spool 16 to the upper side of the vehicle. As shown in FIG. 6, a long cover 24 constituting the air belt 22 of the air belt device 20 is provided on the front end side in the longitudinal direction of the webbing 18. As shown in FIGS. 7 and 8, the cover 24 includes a cover belt 26 as a restraining member. The front end of the webbing 18 in the longitudinal direction (the end on the arrow A direction in FIG. 6) is fixed to the longitudinal base end (the end on the arrow B direction in FIG. 6) of the cover belt 26 by sewing or the like. The cover belt 26 is connected to the spool 16 by the webbing 18. The cover belt 26 is formed in a belt shape, and the elongation (elongation rate with respect to a constant tensile force) of the cover belt 26 is approximately the same as that of the webbing 18.

  As shown in FIG. 1, a through anchor 28 as a bending member, a folding member, and a support member (shoulder side support member) is provided on the vehicle upper side of the winding device 12. The through anchor 28 is attached to a center pillar which is an aspect of the side wall of the vehicle. As shown in FIG. 4, a through anchor insertion hole 30 is formed in the through anchor 28, and the cover 24 is inserted into the through anchor insertion hole 30 of the through anchor 28, and the cover 24 is one in the thickness direction. It is bent at an angle of 90 degrees or more and less than 180 degrees to the side and is turned back to the vehicle lower side. Further, as shown in FIG. 1, an anchor member 32 is provided on the outer side in the vehicle width direction of the seat 14 and on the lower side of the vehicle.

  The anchor member 32 is fixed to the vehicle body or the seat frame of the seat 14, and the longitudinal end portion of the cover belt 26 of the cover 24 of the air belt 22 is locked to the anchor member 32. A tongue 34 is provided between the through anchor 28 of the cover 24 and the anchor member 32. A tongue insertion hole is formed in the tongue 34, and the cover 24 of the air belt 22 is inserted into the tongue insertion hole. For this reason, the tongue 34 can move along the cover 24. A buckle 36 is provided on the inner side in the vehicle width direction of the seat 14. The buckle 36 is fixed to the vehicle body or the seat frame of the seat 14. When the tongue 34 is held by the buckle 36 in a state where the air belt 22 is hooked on the body of the occupant 38, the air belt 22 against the body of the occupant 38. Is in a mounted state (shown in FIG. 1).

  As shown in FIGS. 7 and 8, the cover 24 of the air belt 22 includes a cover stretch 40. The cover stretch 40 is formed in a strip shape long in the longitudinal direction of the cover belt 26 of the cover 24, and the elongation of the cover stretch 40 is higher than the elongation of the cover belt 26 (that is, the cover stretch 40 is , Easier to extend than the cover belt 26). The cover stretch 40 is opposed to the cover belt 26 in the thickness direction of both the cover stretch 40 and the cover belt 26, and both end portions in the width direction of the cover stretch 40 (the end portion in the direction of arrow C in FIGS. 7 and 8). The arrow D direction side end) is coupled to both ends in the width direction of the cover belt 26 by stitching. For this reason, the cover 24 is formed in a cylindrical shape that is opened at least at the front end portion in the longitudinal direction (arrow A direction side in FIG. 6).

  As shown in FIGS. 6, 7, and 8, the cover 24 is provided with a bag body 42. As shown in FIG. 5, the bag body 42 is formed in a strip shape that is long in the longitudinal direction of the cover 24. Further, as shown in FIGS. 7 and 8, the bag body 42 is formed into a two-layer structure including a bag body first layer 44 and a bag body second layer 46 by double weaving by bag weaving. Yes. Further, both end portions in the width direction of the bag body 42 (the end portion on the arrow C direction side in FIG. 5 and the end portion on the arrow D direction side) and the longitudinal base end portion (the end portion on the arrow B direction side in FIG. 5) of the bag body 42. ), And both end portions in the width direction of the bag body 42 and the base end portion in the longitudinal direction of the bag body 42 have a single layer structure. Thereby, the bag body 42 is formed in a cylindrical shape or a bag shape opened at the longitudinal end portion (the end portion on the arrow A direction side in FIG. 5).

  As shown in FIG. 5, the bag body 42 includes a first wide portion 48. In the first wide portion 48, the width dimension of the bag body 42 (dimensions in the arrow C direction and the arrow D direction in FIG. 5) is larger than the width dimension of the cover belt 26 and the cover stretch 40 of the cover 24. The front end side in the longitudinal direction of the bag body 42 relative to the first wide portion 48 is a first narrow portion 50. In the first narrow portion 50, the width dimension of the bag body 42 is equal to or less than the width dimension of the cover belt 26 and the cover stretch 40 of the cover 24, and the first narrow width portion 50 is the first wide section 48 of the bag body 42. It is arrange | positioned in the width direction center part. In the retracted state of the webbing 18 and the air belt 22 shown in FIG. 3, the first narrow portion 50 of the bag body 42 is disposed between the through anchor 28 and the anchor member 32 as shown in FIG. 4.

  As shown in FIG. 5, the front end side of the bag body 42 in the longitudinal direction from the first narrow portion 50 is a second wide portion 52. In the second wide portion 52, the width dimension of the bag body 42 (dimensions in the directions of arrows C and D in FIG. 5) is larger than the width dimensions of the cover belt 26 and the cover stretch 40 of the cover 24. The front end side of the bag body 42 in the longitudinal direction from the second wide portion 52 is a width changing portion 54, and the width dimension of the bag body 42 is directed toward the front end side in the longitudinal direction of the bag body 42. It is getting smaller. The front end side in the longitudinal direction from the width changing portion 54 of the bag body 42 is a second narrow portion 56. In the second narrow portion 56, the width dimension of the bag body 42 is equal to or less than the width dimension of the cover belt 26 and the cover stretch 40 of the cover 24, and the second narrow width portion 56 is the second wide width section 52 of the bag body 42. It is arrange | positioned in the longitudinal direction front end side in the width direction center part.

  Further, as shown in FIG. 5, the cover 24 is provided with a strap belt 58 as a belt-like member. The strap belt 58 is formed in a strip shape that is long in the longitudinal direction of the cover belt 26 of the cover 24, and the elongation of the strap belt 58 is lower than that of the bag body 42 and higher than that of the cover belt 26. Is set. Further, the strap belt 58 is disposed in the center of the bag body 42 in the width direction between the bag body 42 and the cover stretch 40 of the cover 24. Further, the longitudinal base end portion (the end portion on the arrow B direction side in FIG. 5) of the strap belt 58 is coupled to the cover belt 26 of the cover 24 by sewing or the like, so that the strap belt 58 and the cover belt 26 are integrated. Has been.

  In the first wide portion 48 of the bag body 42, the widthwise both side portions of the first wide portion 48 shown in FIG. 5 outside the strap belt 58 in the width direction are thicker than the strap body 58 as shown in FIG. It is folded in the vertical direction to the strap belt 58 side (arrow E direction side in FIG. 7), and the both sides in the width direction of the first wide portion 48 folded in this way are It is disposed between the central portion in the width direction and the strap belt 58. On the other hand, in the width changing portion 54 and the second wide portion 52 of the bag body 42, as shown in FIG. 8, the width direction both sides of the width direction outer side than the strap belt 58 shown in FIG. The strap 42 is folded in the thickness direction of the body 42 toward the strap belt 58 side (the direction of arrow E in FIG. 8), and the width change side portions of the width changing portion 54 and the second wide portion 52 are sandwiched between the strap belts 58. The width change portion 54 and the second wide portion 52 are disposed on the opposite side to the center portion in the width direction. Further, an appropriate position of the central portion in the width direction of the second wide portion 52 of the bag body 42 is coupled to the strap belt 58 by sewing or the like.

  In such a folded state of the bag body 42, the bag body 42 and the strap belt 58 are disposed in the cover 24. As shown in FIG. 2, when the air belt 22 is attached to the body of the occupant 38, the portion between the through anchor 28 and the tongue 34 of the bag body 42 is inflated on the vehicle front side of the shoulder and chest of the occupant 38. The portion of the bag body 42 between the tongue 34 and the anchor member 32 can be inflated and deployed on the front side of the vehicle at the waist of the occupant 38. In the retracted state of the webbing 18 and the air belt 22 shown in FIG. 3, as shown in FIG. 4, the longitudinal front end side portion of the first wide portion 48 of the bag body 42 of the air belt 22 is the through anchor of the through anchor 28. It is arranged inside the insertion hole 30.

  On the other hand, as shown in FIG. 1, the air belt device 20 includes a tube 60 as a fluid supply member and a gas supply member. The tube 60 has a cylindrical shape opened at both ends in the longitudinal direction. The longitudinal direction proximal end portion of the tube 60 is connected to an inflator 62 as a fluid generating means or a gas generating means. The inflator 62 is operated to generate a gas as a fluid. The gas generated in the inflator 62 passes through the inside of the tube 60 and is sent to the distal end side in the longitudinal direction of the tube 60.

  The inflator 62 is electrically connected to an ECU (not shown) as a control device. The ECU is electrically connected to an acceleration sensor (not shown) as a collision detection means, and an acceleration detection signal output from the acceleration sensor is input to the ECU. When the acceleration detection signal output from the acceleration sensor is switched from the Low level to the High level, the inflator control signal output from the ECU is switched from the Low level to the High level, and thereby the inflator 62 is activated. Further, the distal end side in the longitudinal direction of the tube 60 enters the inner side of the bag body 42 from the longitudinal distal end portion of the bag body 42. The gas supplied from the inflator 62 into the tube 60 is discharged from the longitudinal end portion of the tube 60 to the inside of the bag body 42, whereby the bag body 42 is expanded and deployed.

<Operation and Effect of First Embodiment>
In the seat belt device 10, the tongue 34 is gripped and pulled by an occupant 38 seated on the seat 14. As a result, the webbing 18 and the air belt 22 are drawn around the body of the occupant 38 from the front side of the occupant 38 while being pulled out of the spool 16 of the winding device 12. When the tongue 34 is held by the buckle 36 in this state, the air belt 22 is attached to the body of the occupant 38 as shown in FIG.

  In this state, when the vehicle collides, a lock mechanism provided in the winding device 12 is activated, and the spool 16 of the winding device 12 is restricted from rotating in the pull-out direction by the lock mechanism. As a result, the withdrawal of the webbing 18 from the spool 16 is restricted. The front end of the webbing 18 in the longitudinal direction is joined to the longitudinal base end of the cover belt 26 of the cover 24 of the air belt 22 by stitching, and the elongation of the cover belt 26 is approximately the same as that of the webbing 18. . Therefore, the body of the occupant 38 can be restrained by the cover belt 26, and the occupant 38's body can be effectively restricted from being inertially moved to the front side of the vehicle.

  Further, when the acceleration (deceleration) of the vehicle at the time of the vehicle collision is detected by the acceleration sensor, the acceleration detection signal output from the acceleration sensor is switched from the Low level to the High level. When the high level acceleration detection signal is input to the ECU, the inflator control signal output from the ECU is switched from the low level to the high level, whereby the inflator 62 is activated and gas is generated in the inflator 62. . The gas generated in the inflator 62 is sent from the longitudinal base end portion of the tube 60 to the inside of the tube 60.

  Further, the gas sent to the inside of the tube 60 flows to the distal end side in the longitudinal direction of the tube 60, and is discharged from the distal end portion in the longitudinal direction of the tube 60 to the inside of the bag body 42. As a result, as shown in FIG. 2, the bag body 42 is inflated and deployed on the vehicle front side of the body of the occupant 38, and the area that receives the load from the body of the occupant 38 that is about to move to the vehicle front side can be increased. It is possible to distribute the load that the body of the occupant 38 receives from the front side of the vehicle.

  Further, the elongation of the strap belt 58 of the air belt 22 is lower than the bag first layer 44 and the bag second layer 46 of the bag 42. For this reason, the inflated and deployed bag body 42 is pressed toward the body of the occupant 38 by the tension of the strap belt 58. Thereby, the shape and position of the inflated and deployed bag body 42 can be maintained, and the inflated and deployed bag body 42 can be held in contact with the body of the occupant 38.

  On the other hand, the elongation of the strap belt 58 is higher than that of the cover belt 26 of the cover 24 of the air belt 22. For this reason, the strap belt 58 can be extended by the expansion and deployment of the bag body 42. Thus, the bag body 42 can be sufficiently expanded and expanded by the extension of the strap belt 58.

  By the way, in the present embodiment, in the retracted state of the webbing 18 and the air belt 22 shown in FIG. 3, as shown in FIG. 4, the front end portion in the longitudinal direction of the first wide portion 48 of the bag body 42 of the air belt 22 is The through anchor 28 is disposed inside the through anchor insertion hole 30. For this reason, when the air belt 22 is pulled to the front end side in the longitudinal direction and attached to the body of the occupant 38, the first wide portion 48 of the bag body 42 passes through the through anchor insertion hole 30.

  In the portion of the first wide portion 48 of the bag body 42 that is folded back by the through anchor insertion hole 30 of the through anchor 28, the bag body 42 has the outer bag body first layer 44 and the bag along the direction of the radius of curvature of the folding. The body second layer 46 has a longer circumferential length than the inner bag body first layer 44 and the bag body second layer 46, and the bag has a length difference corresponding to the circumferential length difference. Looseness occurs in the body first layer 44 and the bag body second layer 46.

  Here, the cause of the slack will be described with reference to FIGS. 9 and 10 are schematic cross-sectional views in which the folded portion of the air belt 22 at the through anchor 28 is cut at the center of the air belt 22 in the width direction. Here, in the air belt 22 shown in FIG. 9, both side portions in the width direction of the first wide portion 48 of the bag body 42 are on the opposite side of the center portion in the width direction of the first wide portion 48 across the strap belt 58. It is folded. On the other hand, in the air belt 22 shown in FIG. 10, both side portions in the width direction of the first wide portion 48 of the bag body 42 are folded between the strap belt 58 and the central portion in the width direction of the first wide portion 48. It is folded.

  9 and 10, the portion of the through anchor 28 that supports the air belt 22 is assumed to have a cylindrical shape whose center axis is along the width direction of the air belt 22. 9 and 10, D represents the radius of the cross-sectional shape of the through anchor 28, Tc represents the thickness of the cover belt 26 of the cover 24, and T1 represents the first layer of the bag body 42 of the bag body 42. 44, T 2 indicates the thickness of the bag second layer 46 of the bag body 42, Ts indicates the thickness of the strap belt 58, and θ indicates the folding of the air belt 22 in the through anchor 28. Indicates the angle.

  In the configuration shown in FIG. 9, at the folded portion of the air belt 22 at the through anchor 28, the bag body 42 wraps around the innermost portion in the radial direction of the cross-sectional shape of the through anchor 28 in the bag body 42. The direction length Rin1 is represented by the following formula (1).

  On the other hand, the circumferential length of the folded first layer 44 of the bag body located on the outermost side in the radial direction of the cross-sectional shape of the through anchor 28 in the bag body 42 at the folded portion of the through belt 28 of the air belt 22. Rout1 is represented by the following formula (2).

  Accordingly, in the configuration shown in FIG. 9, the circumferential length Rout1 of the bag body first layer 44 located on the outermost side in the radial direction of the cross-sectional shape of the through anchor 28 in the bag body 42 and the bag located on the innermost side. ΔR1, which is the difference in the circumferential length Rin1 of the body first layer 44, is expressed by the following equation (3).

  On the other hand, in the configuration shown in FIG. 10, the bag body first layer 44 is folded back at the innermost portion in the radial direction of the cross-sectional shape of the through anchor 28 in the bag body 42 at the folded portion at the through anchor 28 of the air belt 22. The circumferential length Rin2 is expressed by the following equation (4).

  On the other hand, the circumferential length of the folded first layer 44 of the bag body located on the outermost side in the radial direction of the cross-sectional shape of the through anchor 28 in the bag body 42 at the folded portion of the through belt 28 of the air belt 22. Rout2 is represented by the following equation (5).

  Therefore, in the configuration shown in FIG. 10, the circumferential length Rout2 of the bag body first layer 44 located on the outermost side in the radial direction of the cross-sectional shape of the through anchor 28 in the bag body 42 and the bag located on the innermost side. ΔR3, which is the difference in the circumferential length Rin2 of the body first layer 44, is expressed by the following equation (6).

  ΔR1-2, which is the difference between ΔR1 and ΔR2, is expressed by the following equation (7). As described above, in the configuration shown in FIG. 9, both side portions in the width direction of the first wide portion 48 of the bag body 42 are on the opposite side of the central portion in the width direction of the first wide portion 48 with the strap belt 58 interposed therebetween. 10 is shown in FIG. 10 in which both side portions in the width direction of the first wide portion 48 of the bag body 42 are folded between the strap belt 58 and the central portion in the width direction of the first wide portion 48 because they are folded. Compared to the configuration described above, the circumferential length of the bag first layer 44 located on the outermost side in the radial direction of the cross-sectional shape of the through anchor 28 in the bag 42 is increased by ΔR1-2.

  Here, assuming that the bag body 42 does not stretch in the longitudinal direction at the folded portion of the air belt 22 at the through anchor 28, in the configuration shown in FIG. The slack of ΔR1 occurs in the bag first layer 44 located on the innermost side of the body 42, and in the configuration shown in FIG. 10, the innermost side of the bag body 42 at the folded portion of the through anchor 28 of the air belt 22. The slack of ΔR2 is generated in the bag first layer 44 located at the position. As a result of such slackening, the thickness of the first wide portion 48 of the folded bag body 42 increases at the folded portion of the air belt 22 at the through anchor 28.

  Here, as shown in Expression (7), ΔR2 is shorter by ΔR1-2 than ΔR1. For this reason, in the configuration of the present embodiment in which both widthwise side portions of the first wide portion 48 of the bag body 42 are folded between the strap belt 58 and the widthwise central side portion of the first wide portion 48, The slack can be reduced at the folded portion of the air belt 22 at the through anchor 28, and the increase in the thickness of the first wide portion 48 of the folded bag body 42 can be suppressed.

  Thus, when the air belt 22 is pulled out and stored, the air belt 22 is smoothly folded back (bent) through the through anchor insertion hole 30 of the through anchor 28. For this reason, the operational feeling (feeling) of the air belt 22 when the air belt 22 is pulled out and stored is improved. Further, when the air belt 22 is stored, the air belt 22 is smoothly folded back through the through anchor insertion hole 30 of the through anchor 28, so that the webbing 18 and the air belt 22 can be smoothly wound and stored by the spool 16 of the winding device 12. . As a result, the occurrence of insufficient winding of the webbing 18 and the air belt 22 around the spool 16 can be prevented or suppressed.

  On the other hand, in the width changing portion 54 and the second wide portion 52 of the bag body 42, the width direction both side portions outside the strap belt 58 in the width direction are in the strap belt 58 side in the thickness direction of the bag body 42 (arrows in FIG. 8). E side) is folded, and the width change side portions of the width change portion 54 and the second wide portion 52 are wider than the strap belt 58 in the width change portion 54 and the second wide portion 52 with the strap belt 58 interposed therebetween. It is arrange | positioned on the opposite side to the center part in the width direction. For this reason, the width direction both side parts in the width change part 54 and the 2nd wide part 52 do not receive the load to the passenger | crew 38 side based on the tension | tensile_strength of the strap belt 58. FIG. Therefore, due to the pressure of the gas supplied from the tube 60 to the inside of the bag body 42, both sides in the width direction of the width changing portion 54 and the second wide width portion 52 can be quickly and satisfactorily improved in the front side of the body of the occupant 38. Can be expanded and deployed.

<Second Embodiment>
As shown in FIG. 11, in the second embodiment, both side portions in the width direction of the first wide portion 48 of the bag body 42 are opposite to the strap belt 58 in the thickness direction of the bag body 42 (FIG. 11). The strap belt 58 and the first wide portion 48 are arranged on the opposite side of the strap belt 58 across the central portion in the width direction. Even in such a configuration, the first wide portion 48 does not wrap the strap belt 58, and the radius of curvature at the bent portion of the first wide portion 48 can be reduced, and the curvature at the bent portion of the first wide portion 48 can be reduced. The occurrence of slack in the radially inner portion can be reduced, and an increase in the overall thickness dimension of the folded first wide portion 48 due to the occurrence of slack can be suppressed.

  Further, as described above, since both side portions in the width direction of the first wide portion 48 of the bag body 42 are folded in the thickness direction of the bag body 42 to the side opposite to the strap belt 58, the first wide portion 48 is provided. The center portion in the width direction and the strap belt 58 can be coupled, and the expansion and deployment of the first wide portion 48 of the bag body 42 can be stabilized.

  In the first embodiment, both widthwise outer side portions of the first wide portion 48 of the bag body 42 in the width direction outside the strap belt 58 are folded toward the strap belt 58 side in the thickness direction of the bag body 42. Rarely, the first wide portion 48 was disposed between the central portion in the width direction and the strap belt 58. In the second embodiment, both widthwise outer side portions of the first wide portion 48 of the bag body 42 outside the strap belt 58 in the width direction are opposite to the strap belt 58 in the thickness direction of the bag body 42. The strap belt 58 was placed on the opposite side of the first wide portion 48 across the central portion in the width direction.

  However, the folding of both side portions in the width direction outside the strap belt 58 in the first wide portion 48 of the bag body 42 is not limited to the above configuration. For example, the width direction one side part from the strap belt 58 in the 1st wide part 48 of the bag body 42 is folded by the strap belt 58 side in the thickness direction of the bag body 42, and the width direction center of the 1st wide part 48 is obtained. It is arranged between the portion and the strap belt 58, and the widthwise other side portion of the first wide portion 48 is folded to the opposite side of the strap belt 58 in the thickness direction of the bag body 42. The structure arrange | positioned between the strap belts 58 on both sides of the width direction center part of the 1st wide part 48 may be sufficient.

  As described above, the first wide portion 48 of the bag body 42 is folded on the inner side in the radial direction of curvature of the folding of the strap belt 58 than the strap belt 58 folded in the through anchor insertion hole 30 of the through anchor 28. If it is the structure which can be turned, it will not be limited to the specific aspect of folding.

  In the present embodiment, the strap belt 58 that presses the bag body 42 inflated and deployed between the through anchor 28 and the tongue 34 from the side opposite to the occupant 38 is used as a belt-like member. However, for example, when the webbing 18 whose longitudinal end is locked to the anchor member 32 is a belt-like member and the air belt 22 is attached to the body of the occupant 38, the body of the occupant 38 is restrained by the webbing 18. The first wide portion 48 of the bag body 42 may be folded between the through anchor 28 and the tongue 34 on the side of the occupant 38 in the thickness direction of the webbing 18. Thus, the specific configuration of the belt-shaped member is not particularly limited and can be widely applied.

  In the present embodiment, the through anchor 28 is configured as a bending member. However, for example, the tongue 34 may be configured as a bending member. The configuration is not limited to the specific configuration as long as the configuration can be bent to one side in the vertical direction.

  Further, in the present embodiment, the cover 24, the bag body 42, and the strap belt 58 of the air belt 22 are bent at an angle of 90 degrees or more and less than 180 degrees to one side in the thickness direction by the through anchor 28 and folded back to the lower side of the vehicle. Was configured. However, the bending angle of the bending member to the one side in the thickness direction of the band-shaped member and the bag body may be 90 degrees or less, or may be 180 degrees. The bending angle to one side in the thickness direction is not particularly limited.

20 Air belt device 28 Through anchor (bending member)
42 Bag 58 Strap belt (band-shaped member)

Claims (3)

A belt-like member disposed on the vehicle front side of the occupant's body in a mounted state on the occupant's body;
A bending member in which the belt-like member is bent to one side in the thickness direction;
The belt-shaped member is provided on one side in the thickness direction of the belt-shaped member, and in a state where the belt-shaped member is mounted on the occupant's body, the belt-shaped member can be inflated and deployed on the vehicle front side of the occupant's body. A bag that is folded and bent together with the belt-like member with a bending member;
An air belt device comprising:   The band-shaped member and the bag body can be attached to the body of the occupant by being pulled out from the retracted state to the distal end side in the longitudinal direction of the band-shaped member rather than the bending member, and in the retracted state, The air belt device according to claim 1, wherein a longitudinal base end side portion of the bag body including a bending position by the bending member is folded on one side in the thickness direction of the belt-like member.   The band-shaped member and the bag body can be attached to the body of the occupant by being pulled out from the retracted state to the distal end side in the longitudinal direction of the band-shaped member rather than the bending member, and in the retracted state, 3. The air belt device according to claim 1, wherein a front end portion in the longitudinal direction of the bag body is folded to the other side in the thickness direction of the belt-like member with respect to a bending position by the bending member.

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