JP2019051859A - Air bag and seat belt device - Google Patents

Abstract

To suppress biting of a webbing into an air bag.SOLUTION: An air bag comprises: a longitudinally long bag body; a movement regulation member which regulates movement of the webbing on a surface of the bag body and in a width direction of the bag body; and a hard member which is so provided on the surface of the bag body as to face the webbing, and is harder than the movement regulation member. For example, the air bag comprises a recess formation member which forms a recess, in which the webbing is accommodated in the state that the bag body is most inflated, in the surface, and the hard member is provided in the recess. For example, the hard member is provided on a portion of the bag body which extends in a longitudinal direction thereof due to inflation.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an airbag and a seat belt device.

  2. Description of the Related Art Conventionally, a device that restrains an occupant by inflating an airbag provided on a webbing is known (see, for example, Patent Document 1).

JP 2013-244857 A

  However, since the bending stiffness of the webbing is relatively low, the webbing tends to bite into the inflated airbag when the webbing tension increases. When the webbing bites into the airbag, the area where the airbag is in close contact with the occupant is reduced, so that it is difficult to keep the airbag in close contact with the occupant.

  Therefore, in the present disclosure, an airbag and a seat belt device that can suppress biting of the webbing are provided.

In one aspect of the present disclosure,
A vertically long bag,
A movement regulating member that regulates movement of the webbing in the width direction of the bag body on the surface of the bag body;
An airbag is provided, which is provided on a surface of the bag body so as to face the webbing and includes a hard member harder than the movement restricting member.

In one embodiment of the present disclosure,
A seat belt device including the airbag and webbing is provided.

  According to one aspect of the present disclosure, since the hard member that is harder than the movement restricting member is provided on the surface of the bag body so as to face the webbing, the hard member suppresses biting of the webbing into the airbag. Can do.

It is a figure which shows an example of a structure of the seatbelt apparatus in this embodiment. It is sectional drawing of the tongue and airbag vicinity of the seatbelt apparatus in this embodiment. It is a top view which shows an example of the airbag in this embodiment. It is sectional drawing in FF of FIG. It is sectional drawing in AA of FIG. 3 in the state before a bag body expand | swells and expands. It is sectional drawing in AA of FIG. 3 in the state which the bag body expanded most. It is sectional drawing in CC of FIG. It is sectional drawing in BB of FIG. It is a figure which shows the difference by the presence or absence of a reinforcement member about the biting into the airbag of webbing. It is a figure which shows an example of the state by which the upper part of the airbag was folded. It is a figure which shows an example of the state which the upper part of the airbag extended.

  Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. In each drawing, the X axis, the Y axis, and the Z axis are orthogonal to each other. The X axis direction, the Y axis direction, and the Z axis direction represent a direction parallel to the X axis, a direction parallel to the Y axis, and a direction parallel to the Z axis, respectively. The XY plane, the YZ plane, and the ZX plane represent a plane including the X axis and the Y axis, a plane including the Y axis and the Z axis, and a plane including the Z axis and the X axis, respectively.

  FIG. 1 is a perspective view schematically showing an example of the configuration of the seat belt device in the present embodiment. A seat belt device 100 shown in FIG. 1 is installed in a seat 1 of a vehicle. The seat belt device 100 includes a retractor 2, a webbing 11, an air belt 10, a shoulder anchor 7, a tongue 4 and a buckle 9.

  The webbing 11 drawn out from the retractor 2 is drawn around the shoulder anchor 7 and folded back by the tongue 4. The end of the webbing 11 is fixed to the anchor plate 6. The anchor plate 6 is fixed to a fixing portion (not shown) of the seat or the vehicle body via the fixing bolt 5.

  The seat 1 is, for example, a front seat such as a driver seat or a passenger seat. The seat 1 may be a rear seat.

  The retractor 2 is a device that feeds out or winds up the webbing 11, and in this embodiment, is installed on the B pillar. However, the retractor 2 may be installed in a vehicle body side portion such as a B-pillar, a C-pillar, or a tray behind the rear seat corresponding to the position of the seat 1. Further, the retractor 2 may be installed inside the seat 1 (for example, inside the seat back 1B).

  An air belt 10 is attached to the shoulder anchor 7 side of the tongue 4 slidably attached to the webbing 11. The tongue 4 includes a gas supply pipe 4a and a tongue plate 4b. The gas supply pipe 4a is a metal cylindrical body, and a gas introduction port 21 at the lower end of the airbag 20 shown in FIG. 3 to be described later through a gas supply path in the tongue 4 communicating with the gas supply pipe 4a. Communicating with

  In FIG. 1, the buckle 9 to which the tongue 4 is attached and detached is fixed to a seat or a fixing portion (not shown) of the vehicle body via a bracket 9a via a fixing member such as a bolt. The buckle 9 is formed with a tongue plate support hole 9b and a gas supply pipe connection hole 9c. When the tongue 4 is attached, the tongue plate 4b and the gas supply pipe 4a are inserted into the holes 9b and 9c of the buckle 9, respectively. The The gas supply pipe connecting hole 9c into which the gas supply pipe 4a is inserted communicates with the buckle 9 or a gas outlet (not shown) of the inflator 16 installed on the vehicle body side. At the time of a collision or the like, gas is ejected from the gas ejection port of the inflator 16 due to the reaction of the igniter in the inflator 16, and the air belt 10 expands along the webbing 11 as shown by a two-dot chain line 10 'in FIG. The air belt 10 moves upward (in the embodiment, the shoulder anchor 7 side) while being inflated and deployed along the longitudinal direction of the webbing 11.

  FIG. 2 is a cross-sectional view of the vicinity of the tongue and the airbag of the seat belt device according to the present embodiment. On the front end side of the tongue plate 4b of the tongue 4, there is provided a latch hole 4c into which a latch member in the buckle 9 is engaged when the tongue plate 4b is inserted into the buckle 9. The rear end side of the tongue plate 4b is embedded in the resin mold 4d. An insertion port 4e for the webbing 11 is provided in the resin mold 4d.

  The air belt 10 is an example of an airbag device. As shown in FIG. 2, the air belt 10 includes a webbing guide 30 through which the webbing 11 is inserted, an inflatable airbag 20 extending along the webbing guide 30, and a bag cover that covers a folded body of the airbag 20. 40. The airbag 20 is disposed outside the webbing guide 30 in a state where the airbag 20 is elongated in the insertion direction of the webbing 11. The air belt 10 includes a lower connecting member 50 that connects the lower ends of the webbing guide 30 and the bag cover 40 to the tongue 4, and an upper connecting member that connects the upper ends of the airbag 20, the webbing guide 30, and the bag cover 40. 51.

  The bag cover 40 has a cover upper end portion 46, and the webbing guide 30 has a guide upper end portion 36 that faces the cover upper end portion 46. The cover upper end portion 46 is an example of a first cover end portion in the insertion direction of the webbing 11. The guide upper end portion 36 is an example of a first guide end portion that faces the first cover end portion. The bag cover 40 has a cover lower end portion 47, and the webbing guide 30 has a guide lower end portion 37 that faces the cover lower end portion 47. The cover lower end portion 47 is an example of a second cover end portion opposite to the first cover end portion in the insertion direction of the webbing 11. The guide lower end portion 37 is an example of a second guide end portion facing the second cover end portion.

  The folded body of the airbag 20 and the webbing guide 30 are inserted into the bag cover 40. The bag cover 40 is an example of a flat and elongated cylindrical cover. The bag cover 40 is formed by a stretchable mesh that is sewn with a suture thread that is cut by the inflation pressure of the airbag 20 or that inflates in accordance with the inflation of the airbag 20. In this embodiment, the overall lengths of the webbing guide 30 and the bag cover 40 are substantially equal, and the positions of the lower end and the upper end of the webbing guide 30 and the bag cover 40 are substantially the same.

  The webbing guide 30 has a peripheral wall portion 38 extending continuously between the guide upper end portion 36 and the guide lower end portion 37. Since the peripheral wall portion 38 continuously extends between the guide upper end portion 36 and the guide lower end portion 37, no cuts such as holes and gaps are formed in the peripheral wall portion 38. Foreign matter can be prevented from being mixed between the bag cover 40 and the webbing guide 30.

  The webbing guide 30 is a flat and elongated cylindrical member through which the webbing 11 is movably inserted in the insertion direction, and is formed of a resin material such as polyurethane resin or silicone elastomer.

  The vertically long webbing guide 30 guides the movement of the webbing 11 in the longitudinal direction. The airbag 20 is disposed outside the webbing guide 30. The upper connecting member 51 connects the guide upper end portion 36 of the webbing guide 30 and the cover upper end portion 46 of the bag cover 40 in a non-inflated and deployed state before the airbag 20 is inflated and deployed. Then, in a state where the airbag 20 is inflated and deployed, the upper connecting member 51 moves upward along the longitudinal direction of the webbing 11 together with the airbag 20 as the airbag 20 is inflated and deployed (FIG. 1). (See the two-dot chain lines 10 'and 51').

  Thus, the airbag 10 includes the upper connecting member 51 that moves upward along the webbing 11 together with the airbag 20 as the airbag 20 is inflated and deployed. By providing such an upper connecting member 51, the length in the longitudinal direction of the air belt 10 in the non-inflated and deployed state can be made shorter than the length in the inflated and deployed state. Therefore, the size of the air belt 10 before the airbag 20 is inflated and deployed can be reduced. As a result, the mountability when the air belt 10 is mounted on a vehicle is improved. Moreover, since the size of the air belt 10 in the normal use state before the airbag 20 is inflated and deployed can be reduced, the troublesomeness that the air belt 10 gives to the occupant in the normal use state can be reduced.

  FIG. 3 is a plan view showing an example of the airbag in the present embodiment, and shows a state in which the airbag 20 alone is flattened. The X-axis direction represents the width direction of the vertically long airbag 20 or the webbing 11. The Y-axis direction represents the longitudinal direction of the airbag 20 or the webbing 11. The Z-axis direction represents the thickness direction of the airbag 20 or the webbing 11.

  The airbag 20 includes a gas inlet 21 on the lower end side (the tongue 4 side). The airbag 20 extends elongated along the webbing 11. A projecting piece 22 is provided on the upper end side (shoulder anchor 7 side) of the airbag 20. A locking hole 22 a is provided in the projecting piece 22. The projecting piece 22 is an example of a bag upper end portion of the airbag 20.

  The airbag 20 is manufactured in the shape of an elongated bag by superimposing two elongated base fabrics 28 and 29 and joining the peripheral portions thereof with a joining portion 23 such as stitching. The base fabric 28 is an example of a first surface on the side where the webbing 11 is provided. The base fabric 29 is an example of the second surface on the side opposite to the side on which the webbing 11 is provided (that is, the occupant side). By joining the base fabric 28 and the base fabric 29 at the joint 23, the vertically long bag body 19 that forms the outer shape of the airbag 20 is produced.

  A slit 24 for passing the webbing guide 30 from the base fabric 28 side to the opposite base fabric 29 side of the airbag 20 is provided on the lower end side (the tongue 4 side) from the middle in the longitudinal direction of the airbag 20. It has been. The base fabrics 28 and 29 are joined to each other by stitching or the like at the joining portions 25A and 25B so as to surround the slit 24.

  A plurality of loop portions 26 for allowing the webbing guide 30 to pass therethrough are provided from the vicinity of the middle in the longitudinal direction of the airbag 20 to the upper end side (projection piece portion 22 side). In the present embodiment, five loop portions 26 a to 26 e are provided so as to protrude from the surface of the base fabric 28. The loop portion 26 is formed of a cloth piece made of the same material as the base cloths 28 and 29, for example. Both side portions of each loop portion 26 are joined to the base fabric 28 or the base fabrics 28 and 29 of the airbag 20 by joint portions 26i by stitching or the like.

  4 is a cross-sectional view taken along line FF in FIG. The loop portion 26 a is attached to the base fabric 28 so as to form a space between the loop portion 26 a and the base fabric 28. A webbing guide 30 through which the webbing 11 is inserted is inserted into the space. Similarly, the webbing guide 30 through which the webbing 11 is inserted is inserted into the space formed between the other loop portions 26 b to 26 e and the base fabric 28.

  The loop portions 26 a to 26 e restrict the webbing 11 from moving in the width direction of the bag body 19 on the surface of the bag body 19. In the present embodiment, the loop portions 26 a to 26 e restrict the webbing guide 30 through which the webbing 11 is inserted from moving together with the webbing 11 in the X-axis direction on the base fabric 28. The loop portions 26a to 26e can suppress the displacement of the webbing 11 and the webbing guide 30 in the X-axis direction on the base fabric 28 by the pair of joint portions 26i facing each other in the X-axis direction.

  As shown in FIGS. 3 and 4, the base fabrics 28 and 29 are joined to each other at a joint portion 25 </ b> B by sewing or the like near the middle in the longitudinal direction and the middle in the width direction of the airbag 20. By joining such as stitching by the joining portion 25B, the thickness of the airbag 20 when it is inflated is regulated.

  FIG. 5 is a cross-sectional view taken along the line A-A in FIG. 3 before the bag body 19 is inflated and deployed. FIG. 6 is a cross-sectional view taken along line AA of FIG. 3 in a state where the bag body 19 is inflated most. 5 and 6, the webbing guide 30 for guiding the webbing 11 is not shown. Near the middle in the longitudinal direction and near the middle in the width direction of the airbag 20, the airbag 20 includes at least one coupling member that couples the base fabric 28 and the base fabric 29 inside the bag body 19. FIGS. 5 and 6 show two tethers 61 and 62 that restrict the expansion of the bag body 19 in the Z-axis direction inside the bag body 19 as an example of such a connecting member. Such a connecting member regulates the thickness of the airbag 20 when it is inflated.

  As shown in FIG. 5, the tethers 61 and 62 are formed by two tether cloths 65 and 66 spreading in the XY plane. The tether cloths 65 and 66 are sandwiched between the base cloth 28 and the base cloth 29 so as to overlap each other. Both sides of each of the tether cloths 65 and 66 in the X-axis direction are joined to each other by joint portions 27e and 27f formed by sewing or the like. Further, the center portion of the tether cloth 65 is joined to the inner surface of the base cloth 28 by joint portions 27a and 27b by sewing or the like. The center portion of the tether cloth 66 is joined to the inner surface of the base fabric 29 by joint portions 27c and 27d by sewing or the like.

  Therefore, when the bag body 19 is inflated and deployed by the inflow of gas, as shown in FIG. 6, the tether 61 is formed between the joint portion 27a and the joint portion 27c, and the joint portion 27b and the joint portion 27d are formed. A tether 62 is formed therebetween. Therefore, the size of the bag body 19 in the Z-axis direction in the maximum expanded state is limited by the tethers 61 and 62.

  By restricting the expansion of the bag body 19 in the Z-axis direction by the tethers 61 and 62, a recess 28 c in which the webbing 11 is accommodated when the bag body 19 is most expanded is formed in the base fabric 28 of the bag body 19. . By forming the recess 28c, a pair of top portions 28a and 28b spaced apart in the X-axis direction are formed on the base fabric 28 on both sides in the X-axis direction of the recess 28c. It becomes difficult for the webbing 11 and the webbing guide 30 to get over the pair of top portions 28a and 28b. Therefore, in the state in which the bag body 19 is most inflated, the movement of the webbing 11 and the webbing guide 30 in the X-axis direction is limited by the pair of top portions 28a and 28b.

  Therefore, the airbag 20 is provided with such a dent forming member (in this embodiment, the tethers 61 and 62), so that the webbing 11 is in the lateral direction (the width direction of the bag body 19 in the state in which the bag body 19 is most inflated). It is possible to prevent displacement in the X-axis direction shown).

  The tether 61 is joined to the inner surface of the base fabric 28 at a joint portion 27a, which is a first joint location with the base fabric 28, and the tether 62 is connected to the base fabric 28 so that the recess 28c is formed in the base fabric 28. It joins with the inner surface of the base fabric 28 by the junction part 27b which is this 2nd junction location. Thus, the recess 28c having a planar bottom is formed by providing at least two joints with the base fabric 28 so that the recess 28c is formed in the base fabric 28. Accordingly, the effect of stabilizing the webbing 11 and the webbing guide 30 with the recess 28c is increased in the state where the bag body 19 is most inflated.

  As shown in FIG. 6, when the bag body 19 is in the most expanded state, the distance between the joint portion 27 a and the joint portion 27 b in the X-axis direction is shorter than the width of the webbing 11, so that the webbing 11 and the webbing guide 30 are recessed. It is preferable at the point stabilized by 28c. If the distance is longer than the width of the webbing 11, the step between the recess 28c and the pair of top portions 28a and 28b becomes smaller, and it becomes difficult to stabilize the webbing 11 and the webbing guide 30 with the recess 28c. .

  The tether 61 is joined to the inner surface of the base fabric 29 at a joint portion 27 c that is a third joint location with the base fabric 29, and the tether 62 is based on a joint portion 27 d that is a fourth joint location with the base fabric 29. Bonded to the inner surface of the cloth 29.

  In the state in which the bag body 19 is inflated most, a first inflatable portion 64 that inflates on one side in the width direction of the bag body 19 with respect to the recess 28c, and the other in the width direction of the bag body 19 with respect to the recess 28c. A second expansion portion 63 that expands on the side is formed. In the state in which the bag body 19 is inflated most, the second inflating part 63 may inflate to the same size as the first inflating part 64 or may inflate larger than the first inflating part 64.

  The first inflating part 64 is a chamber on the left side with respect to the tether 62, and the second inflating part 63 is a chamber on the right side with respect to the tether 61. A third inflating part 60 is formed between the first inflating part 64 and the second inflating part 63.

  7 is a cross-sectional view taken along the line CC of FIG. 8 is a cross-sectional view taken along line BB in FIG. The airbag 20 includes at least one reinforcing member 70. The loop portion 26d is attached to the base fabric 28 so as to form a space 73 between the reinforcing member 70 and the loop portion 26d. A webbing guide 30 that passes through the webbing 11 is inserted into the space 73 together with the webbing 11. Similarly, the webbing 11 and the webbing guide 30 are inserted into the space 73 formed between the other loop portions 26 b to 26 d and the reinforcing member 70.

  The reinforcing member 70 is an example of a hard member that is provided on the base fabric 28 so as to face the webbing 11 and is harder than the loop portion 26. Since the reinforcing member 70 is provided between the webbing 11 and the base fabric 28, the webbing 11 can be prevented from biting into the inflated airbag 20. The reinforcing member 70 reinforces the base fabric 28 against the force that the webbing 11 bites into the airbag 20.

  The reinforcing member 70 maintains the shape of the webbing 11 flat on the surface of the bag body 19 in a state where the bag body 19 is expanded. The reinforcing member 70 is preferably a plate-like member as shown in terms of maintaining the shape of the webbing 11 flat and suppressing the thickness of the air belt 10 in the Z-axis direction. In the present embodiment, the reinforcing member 70 is a plate-like member formed in a rectangular shape that is wide in the X-axis direction.

  The reinforcing member 70 is stored in a storage portion 71 attached to the base fabric 28. The storage portion 71 is joined to the base fabric 28 by a joining portion 26i formed by sewing or the like. The storage part 71 is formed by bending the storage cloth 72. The storage cloth 72 is a cloth made of the same material as the base cloth 28.

  The reinforcing member 70 is inserted into the storage portion 71 formed by bending the single storage cloth 72. Then, the folded storage cloth 72 is joined around the reinforcing member 70 by joint portions 26j and 72i formed by sewing or the like. As described above, the reinforcing member 70 is attached to the base fabric 28 at the joint portion 26 i in a state of being wrapped in the storage cloth 72. Thereby, the reinforcing member 70 can be prevented from jumping out of the storage portion 71. Further, since the storage cloth 72 exists between the reinforcing member 70 and the base cloth 28, it is possible to prevent the hard reinforcing member 70 from coming into direct contact with the soft base cloth 28.

  In FIGS. 7 and 8, the loop 26d is joined at the joint 26j to the storage cloth 72 joined at the joint 72i in a state where the reinforcing member 70 is wrapped, thereby producing a guide loop (sub-assembly product). The By joining this guide loop to the base fabric 28 at the joint portion 26i, a method for joining the loop portion 26d and the reinforcing member 70 to the base fabric 28 becomes easy. The same applies to the case where the other loop portions 26 b and 26 c are joined to the base fabric 28 together with the reinforcing member 70.

  7 and 8, the loop portion 26 d restricts the webbing 11 from moving in the width direction of the bag body 19 on the surface of the bag body 19. The storage portion 71 formed by the storage cloth 72 restricts the joint member 26 j from moving the reinforcing member 70 in the width direction of the bag body 19 on the surface of the bag body 19. That is, one guide loop formed by the loop portion 26d and the storage portion 71 is an example of a movement restricting member that restricts movement of both the webbing 11 and the reinforcing member 70 in the X-axis direction on the base cloth 28. is there. Thus, since one guide loop restricts not only the webbing 11 but also the movement of the reinforcing member 70, the number of parts can be reduced. The same applies to the places where the other loop portions 26 b and 26 c are joined to the base fabric 28 together with the reinforcing member 70.

  FIG. 9 is a diagram illustrating a difference between the presence of the reinforcing member and the biting of the webbing into the airbag.

  In the air belt 10A without the reinforcing member 70, a process of transition from a state where there is no load due to the tension of the webbing 11A to a state where the load due to the tension of the webbing 11A is applied to the airbag is shown. Since the webbing has a relatively low bending rigidity, the webbing 11A bites into the airbag due to the tension load of the webbing 11A, and the webbing 11A is bent into a V shape or a U shape. When the width dimension of the webbing 11A is narrowed by bending, the area of the webbing 11A that pressurizes the surface of the airbag is reduced, so that the pressure applied to the airbag by the webbing 11A is increased, and the biting of the webbing 11A into the airbag is promoted. The Thereby, since the area (effective width) in which the airbag is in close contact with the occupant is reduced in the restrained state of the occupant, it is difficult to keep the airbag in close contact with the occupant. In the worst case, if the inflated airbag cannot support the webbing 11A, the webbing 11A reaches the opposite surface of the airbag (the surface on the side in contact with the occupant). In this state, the airbag cannot exert a sufficient passenger restraining function.

  Similarly, even in the air belt 10 having the reinforcing member 70, a process in which the load due to the tension of the webbing 11 is changed to a state where the load due to the tension of the webbing 11 is applied to the airbag is shown. In FIG. 9, the webbing guide 30 is not shown. The reinforcing member 70 is harder than the webbing guide 30 and has high bending rigidity. The reinforcing member 70 is provided in a recess 28c formed in the base fabric 28 in a state where the airbag is most inflated.

  The reinforcing member 70 has higher bending rigidity than the webbing 11 and the webbing guide 30. Therefore, even when the load due to the tension of the webbing 11 is increased, the shapes of the webbing 11 and the webbing guide 30 are maintained flat by the reinforcing member 70. Therefore, the reinforcing member 70 suppresses the reduction in the width dimension of the webbing 11, and the area where the webbing 11 presses the base fabric 28 is kept constant. As a result, the amount of webbing 11 biting into the airbag can be suppressed, and an area (effective width) where the airbag is in close contact with the occupant can be ensured in a restrained state of the occupant. That is, it becomes easy to keep the airbag in close contact with the occupant, and the airbag can exert a sufficient occupant restraining function.

  FIG. 10 is a diagram illustrating an example of a state in which the upper portion of the airbag is folded. A webbing guide 30 is inserted between each of the loop portions 26 and the base fabric 28 in a direction connecting the slit 24 and the protruding piece portion 22 (see FIG. 3). The webbing 11 is inserted through the webbing guide 30. As shown in FIG. 10, the webbing guide 30 that passes through the loop portion 26 along the base cloth 28 is drawn from the base cloth 28 side to the base cloth 29 side through the slit 24, to the vicinity of the gas inlet 21. Extend. As shown in FIG. 2, the webbing guide 30 extends continuously from the cover lower end portion 47 of the bag cover 40 to the cover upper end portion 46.

  The side surface of the webbing guide 30 is not provided with holes other than the pair of opposing locking holes 30a and 30b (see FIG. 10) formed in the guide upper end portion 36. Thereby, even when a foreign substance enters the inside of the webbing guide 30, the foreign substance can be prevented from entering between the airbag 20 and the bag cover 40.

  The first locking hole 30a is provided on the first guide side surface of the pair of opposing guide side surfaces in the guide upper end portion 36. The second locking hole 30 b is provided on the second guide side surface of the pair of opposing guide side surfaces in the guide upper end portion 36.

The airbag 20 through which the webbing guide 30 is passed through the loop portion 26 and the slit 24 is folded back a plurality of times along the folds F _{1 to} F ₄ on the protruding piece portion 22 side as shown in FIG. An intermediate folding body with a reduced overall length. The extending direction of the fold lines F _{1 to} F ₄ is a direction orthogonal to the longitudinal direction of the airbag 20. The airbag 20 is covered with the bag cover 40 in a state in which a plurality of folds F _{1 to} F ₄ are folded in a bellows shape so that they are aligned in the longitudinal direction of the webbing 11. Since the airbag 20 is folded in the longitudinal direction of the webbing 11 by bellows folding, the length of the airbag 10 in the longitudinal direction in the non-inflated state can be shortened. Further, the air belt 10 can be smoothly extended upward during the expansion and deployment.

  In FIG. 2, when the airbag 20 starts to inflate and deploy, the airbag 20 starts to push the inner surface of the bag cover 40 with a force F. When a force F of a certain level or more is applied to the bag cover 40, the bag cover 40 is broken, and the airbag 20 is exposed from the inside of the bag cover 40 while being inflated and deployed.

  When the airbag 20 is inflated and deployed, an upward force due to the inflation and deployment acts on the upper connecting member 51, and the airbag 20 is fixed to the upper connecting member 51 by a locking hole 22 a (see FIG. 3). It tries to move upward together with the part 22. On the other hand, the webbing guide 30 and the bag cover 40 are fixed to the tongue 4 by the lower connecting member 50.

  Therefore, the distal end portion 30c of the guide upper end portion 36 and the distal end portion of the cover upper end portion 46 are cut by the upper connecting member 51 that moves upward as the airbag 20 is inflated and deployed. The tip portion 30 c (see FIG. 10) is a portion between the locking holes 30 a and 30 b of the guide upper end portion 36 and the upper end 30 d of the guide upper end portion 36. Since the distal end portions of the distal end portion 30 c and the cover upper end portion 46 are cut, the upper connecting member 51 moves away along the webbing 11 together with the airbag 20 away from the guide upper end portion 36 and the cover upper end portion 46. That is, the upper connecting member 51 moves upward along the webbing 11 together with the airbag 20 while leaving the guide upper end portion 36 and the cover upper end portion 46 downward.

10 and 11, at least one reinforcing member 70 is a portion (in this embodiment, the bag body 19 extends from the upper end 30d of the webbing guide 30 in the longitudinal direction (Y-axis direction) of the bag body 19 due to expansion. (Parts folded at folds F _{2 to} F ₄ ). In the present embodiment, three reinforcing members 70 are provided at intervals in the Y-axis direction at the locations of the loop portions 26 b to 26 d, and two of the reinforcing members 70 are located with respect to the upper end 30 d of the webbing guide 30. And provided in a portion extending in the Y-axis direction.

As shown in FIG. 11, the portion 19 a that extends in the Y-axis direction with respect to the upper end 30 d of the webbing guide 30 (in this embodiment, the portion folded at the folds F _{2 to} F ₄ ) is the webbing guide 30. It is not supported by. That is, the webbing guide 30 is not interposed between the extended portion 19 a and the webbing 11. Therefore, for example, even if the webbing guide 30 has the same strength as the reinforcing member 70, it is difficult for the webbing guide 30 to suppress the webbing 11 from biting into the extended portion 19 a. However, in the present embodiment, at least one reinforcing member 70 (in this embodiment, two reinforcing members 70 provided at the locations of the loop portions 26c and 26d) is attached to the extended portion 19a. Therefore, the at least one reinforcing member 70 attached to the extended portion 19a can suppress the webbing 11 from biting into the extended portion 19a.

  While the airbag and the seat belt device have been described above by way of the embodiment, the present invention is not limited to the above embodiment. Various modifications and improvements such as combinations and substitutions with some or all of the other embodiments are possible within the scope of the present invention.

  For example, the air belt 10 may be attached to the anchor plate 6 side of the tongue 4 slidably attached to the webbing 11. That is, the present invention is not limited to the airbag provided on the shoulder belt, but can also be applied to an airbag provided on the lap belt.

  The present invention can also be applied to a form in which the upper end or lower end of the airbag is fixed to the webbing. Further, the dent forming member for forming the dent 28c may be one or plural. In addition, the recess forming member may be realized by a tether, a strap, a connecting material, a patch, a belt, a mooring line, a mooring rope, a string-like member, a belt-like member, or the like.

  Further, the webbing guide is not limited to a member formed in a cylindrical shape, and may be a member formed in a plate shape. Further, the webbing guide may be omitted.

  Further, the number of movement regulating members that regulate the movement of the webbing 11 in the X-axis direction is not limited to a plurality, and may be one. Further, the number of movement restricting members that restrict the movement of the hard member such as the reinforcing member 70 in the X-axis direction is not limited to a plurality, and may be one. The number of hard members is not limited to a plurality, and may be one. The hard member is not limited to a plate-like member, and may be a linear member. Further, the hard member is not limited to the form provided on the outside of the surface of the airbag, and may be provided on the inside of the surface of the airbag (in this embodiment, the inner surface of the base fabric 28).

1 Seat 2 Retractor 4 Tongue 4b Tongue Plate 4d Resin Mold 7 Shoulder Anchor 9 Buckle 10 Air Belt 11 Webbing 16 Inflator 19 Bag 20 Air Bag 21 Gas Inlet 28, 29 Base Fabric 28c Depression 30 Webbing Guide 36 Guide Upper End 37 Guide Lower End Part 38 peripheral wall part 40 bag cover 46 cover upper end part 47 cover lower end part 51 upper connecting members 61, 62 tether 70 reinforcing member 100 seat belt device

Claims (8)

A vertically long bag,
A movement regulating member that regulates movement of the webbing in the width direction of the bag body on the surface of the bag body;
An airbag comprising a hard member that is provided on a surface of the bag body so as to face the webbing and is harder than the movement restricting member. A depression forming member for forming a depression on the surface in which the webbing fits in a state where the bag body is inflated most;
The airbag according to claim 1, wherein the hard member is provided in the recess.   The airbag according to claim 1 or 2, wherein the hard member is provided at a portion where the bag body extends in a longitudinal direction of the bag body by expansion.   The airbag according to any one of claims 1 to 3, wherein the hard member is attached to the surface in a state of being wrapped in a cloth.   The airbag according to any one of claims 1 to 4, wherein the movement restricting member restricts the webbing and the hard member from moving in the width direction on the surface.   The airbag according to any one of claims 1 to 5, wherein the plurality of movement restriction members and the plurality of hard members are provided at intervals in a longitudinal direction of the bag body.   A seat belt device comprising the airbag according to any one of claims 1 to 6 and the webbing. A webbing guide through which the webbing is inserted;
The seat belt device according to claim 7, wherein the hard member is provided in a portion where the bag body extends with respect to the webbing guide.