Occupant protection devices

Abstract

To provide an occupant protection device which allows a lap belt part to be smoothly worn even though a folded air bag is mounted to the lap belt part while being covered with a bag cover.SOLUTION: An occupant protection device 10 includes a lap belt part 13 in a seat belt capable of being disposed on the front side of the waist of an occupant MP seated in a seat, and is configured by including: an air bag 30 capable of receiving and protecting the upper half body of the occupant; and a bag cover 67 covering the folded air bag and a mounting portion 22 of the air bag in the lap belt part in such a manner as to allow the protrusion of the air bag upon inflation. The bag cover includes: an occupant side panel part 68 located on an occupant side when the lap belt part is worn; and an opposite-to-occupant side panel part 70 located on a side separated from the occupant. In the occupant side panel part, there is disposed an exposure part 75 for exposing the lap belt part so that a part 14 of the lap belt part can be brought into contact with the occupant.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an occupant protection device for protecting an occupant seated in a seat. [Background technology]

[0002] Conventionally, there has been known an occupant protection device that protects an occupant seated in a seat by assembling an airbag that inflates when inflation gas flows into the lap belt portion of a seat belt (see, for example, Patent Document 1). The lap belt portion of the seat belt is a belt portion that is disposed in front of the waist of an occupant seated in the seat, with both left and right ends connected to the left and right sides of the seat. When inflation gas flows into the airbag and the airbag inflates, the airbag receives and protects the upper body of the occupant moving forward. In addition, in the occupant protection device, a bag cover allows the airbag to protrude when inflated, and covers the folded airbag and the assembly portion of the airbag in the lap belt portion to prevent foreign matter from being mixed into the folded airbag. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-51744 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional occupant protection devices, when the lap belt portion is attached to an occupant seated in the seat, the bag cover comes into contact with the front side of the occupant's abdomen. At that time, if the bag cover is configured to be made, for example, from a cloth material similar to the seat material so as not to degrade the design, the frictional resistance will be large and the lap belt portion will not easily slip off the occupant, hindering the attachment of the lap belt portion.

[0005] The present invention is devised to solve the above-mentioned problems, and aims to provide an occupant protection device that allows the lap belt portion to be smoothly fastened even when the folded airbag is covered with a bag cover and assembled to the lap belt portion. [Means for solving the problem]

[0006] The occupant protection device according to the present invention includes a seat belt having a lap belt portion that can be disposed in front of the hips of an occupant seated in the seat with both left and right ends connected to the left and right sides of the seat when the occupant is wearing the lap belt portion, an airbag that is attached to the lap belt portion and that, when activated, is inflated by the inflow of inflation gas and is capable of receiving and protecting the upper body of an occupant moving forward; a bag cover that covers the folded airbag and an assembly portion of the lap belt portion to which the airbag is attached so as to allow the airbag to protrude when inflated; An occupant protection device comprising: The bag cover is The seat belt has an occupant-side panel portion that is positioned on the occupant side when the lap belt portion is worn, and an anti-occupant-side panel portion that is positioned on the side away from the occupant, The lap belt device is characterized in that an exposure portion for exposing the lap belt portion is disposed on the occupant-side panel portion so that a part of the lap belt portion can come into contact with the occupant.

[0007] In the passenger protection device according to the present invention, when the lap belt is worn, the lap belt is exposed from the exposed portion of the bag cover and can come into contact with the passenger. That is, the lap belt itself is made of a seat belt with good sliding properties made of woven polyester fibers or the like, and the lap belt exposed from the exposed portion provided in the bag cover reduces the contact area between the bag cover and the passenger and increases the contact area between the lap belt itself with good sliding properties and the passenger, thereby reducing the frictional resistance of the bag cover against the passenger. Therefore, when the lap belt is worn, the installation portion of the folded airbag in the lap belt can be smoothly positioned relative to the passenger.

[0008] Therefore, in the occupant protection device of the present invention, even if the folded airbag is covered with a bag cover and attached to the lap belt portion, the frictional resistance of the bag cover is reduced, and the lap belt portion can be smoothly attached.

[0009] In the passenger protection device according to the present invention, the airbag and a bag connecting portion attached to the airbag and slidably connecting the folded airbag to the lap belt portion; a bag cover that covers the folded airbag and the bag connecting portion together with the assembly portion of the lap belt portion; A bag assembly comprising: the bag connecting portion is configured to have a cylindrical shape through which the lap belt portion can be inserted, by connecting the outer peripheral edges of an occupant side portion that covers the occupant side surface of the lap belt portion when worn and an anti-occupant side portion that covers the surface opposite to the occupant and is connected to the airbag side, and The occupant side portion includes a left side portion and a right side portion separated from each other in the left and right directions, It is desirable that the bag cover is configured so that the exposed portion is arranged between the opposing inner edges of the left side and the right side of the bag connection portion, and that insertion holes for inserting the lap belt portion from the inner side to the outer side of the bag cover are arranged on each of the opposing inner edges of the left side and the right side of the bag connection portion.

[0010] In this configuration, the lap belt portion is disposed from the inner periphery to the outer periphery of the bag cover through the insertion holes of the bag cover located on the inner edge sides of the left and right sides of the bag connection portion facing each other, so that the lap belt portion can come into contact with the occupant through the exposed portion between the left and right insertion holes of the bag cover. In this configuration, the airbag, the bag cover, and the bag connection portion that connects the folded airbag to the lap belt portion are integrally assembled to the lap belt portion as a bag assembly, and can be moved along the lap belt portion. In other words, the bag connection portion that connects the folded airbag to the assembly portion of the lap belt portion is in a state where the occupant side portion and the anti-occupant side portion enclose the lap belt portion in a cylindrical shape, so that the bag cover and the bag connection portion can be moved along the lap belt portion with the airbag attached. Of course, the bag connection portion does not slide against the lap belt portion along its entire length, but rather an exposed portion is provided on the occupant side between the left and right sides which are separated from each other, such that a portion that does not slide against the lap belt portion is provided. Since the left and right sides slide against the lap belt portion over a small area, sliding resistance against the lap belt portion is also reduced, and the bag assembly can be easily moved along the lap belt portion. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view of a seat equipped with an occupant protection device according to an embodiment of the present invention; [Diagram 2] 1 is a left side view of a seat equipped with an occupant protection device according to an embodiment; [Diagram 3] FIG. 1 is a front view of a seat equipped with an occupant protection device according to an embodiment, showing the state in which the seat belt is fastened to the occupant, and also showing the airbag when inflated by a two-dot chain line, and further showing a schematic longitudinal cross-sectional view of the assembly portion of the airbag to the lap belt portion. [Figure 4] FIG. 4 is a partial plan view showing a state in which a bag cover is removed from a portion of the lap belt portion to which an airbag is attached according to the embodiment. [Diagram 5]FIG. 4 is a partial plan view showing a state in which a bag cover is attached to an airbag attachment portion of the lap belt portion according to the embodiment. [Figure 6] 6 is a schematic partial cross-sectional view of an assembly portion of an airbag in a lap belt portion according to the embodiment, the cross-sectional view corresponding to the portion VI-VI in FIG. 5. [Figure 7] 1 is a schematic perspective view showing a state in which an airbag is inflated in a bag assembly of an occupant protection device according to an embodiment; [Figure 8] FIG. 2 is a schematic plan view of each component that constitutes the bag assembly of the embodiment. [Figure 9] 4 is a front view showing the state where the airbag of the occupant protection device according to the embodiment has been completely inflated; FIG. [Figure 10] 4 is a left side view showing the state where the airbag of the occupant protection device according to the embodiment has been completely inflated; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of the present invention will be described below with reference to the drawings. An occupant protection device 10 of the embodiment is mounted on a vehicle seat 1 as shown in Figs. 1 to 3, 9 and 10, and is configured to include a seat belt 11, a bag assembly 29 equipped with an airbag 30, and an inflator 24 that supplies inflation gas to the airbag 30. The seat 1 includes a backrest portion 2 and a seat portion 5.

[0013] The seat belt 11 is disposed on one side in the left-right direction of the seat 1 (the left side in this embodiment) so that the upper end 11a can be retracted from a retractor 15 disposed inside the left edge 3a side of the upper end 3 of the backrest portion 2, and the lower end 11b is disposed as a fixed end fixed to an anchor member 17 disposed on the left side portion 6 side of the seat portion 5, so as to be able to restrain an occupant MP seated in the seat 1. The seat belt 11 is formed from a strip-shaped material woven from polyester fiber or the like having good sliding properties.

[0014] A tongue 20 is disposed in the middle of the seat belt 11, and the tongue 20 is fastened to a buckle 19 disposed on the right side 7 of the seat part 5 on the other side in the left-right direction of the seat 1 (the right side in this embodiment), and in the seat belt 11 with the tongue 20 fastened to the buckle 19, the part extending from the tongue 20 toward the retractor 15 is the shoulder belt part 12 disposed on the front side of the upper body MU of the occupant MP, and the part extending from the tongue 20 toward the fixed end 11b is the lap belt part 13 disposed on the front side of the waist part MW of the occupant MP. Note that the buckle 19 is provided with a release button (not shown), and when the fastened tongue 20 is to be released, the tongue 20 can be removed from the buckle 19 by pressing the release button. The retractor 15 is also configured to stop the belt 11 from being pulled out if the belt 11 is suddenly pulled out, and further includes a pretensioner that can retract the pulled out belt 11 if the vehicle crashes or the like.

[0015] The inflator 24 includes a generally cylindrical inflator body 25 that discharges inflation gas, and a pipe portion 26 that protrudes from the inflator body 25 and is bent into a generally L-shape, and is attached and fixed to the rear side of the bottom part 5 of the seat 1 (see Figs. 1 and 2). A tip end 47a of a gas supply passage portion 45 of the airbag 30, which will be described later, is fitted onto the pipe portion 26, and is further fastened and connected by a clamp 27.

[0016] The bag assembly 29 includes the airbag 30, a bag connecting portion 54, and a bag cover 67, and further includes a gas supply passage portion 45 that connects the airbag 30 and the inflator 24 to supply inflation gas from the inflator 24 to the airbag 30 in this embodiment. When the lap belt portion 13 is worn by the occupant MP, the bag assembly 29 comes into close contact with the front side of the abdomen MB of the occupant MP (see the two-dot chain line in FIG. 2).

[0017] 7 and 10, the airbag 30 is configured so that the peripheral wall 31 inflates into a substantially triangular prism shape as viewed from the side when inflation is complete, and includes a bottom wall portion 32 on the bottom side, a rear wall portion 33 on the rear side, a front wall portion 34 on the front side, and left and right side walls 35 (L, R). When inflation is complete, the airbag 30 has a lower surface 32a of the bottom wall portion 32 serving as a support surface 37 for supporting the thighs MF of the occupant MP, and a rear surface 33a of the rear wall portion 33 serving as an occupant restraint surface 38 for receiving the upper body MU of the occupant MP moving forward.

[0018] An inlet portion 40 having a plurality of inlets 40a for allowing the inflation gas to flow in from the gas supply passage portion 45 is disposed near the rear edge 32b of the bottom wall portion 32. In addition, vent holes 42 for discharging excess inflation gas flowing into the airbag 30 are formed on the front sides of the left and right side walls 35L, 35R.

[0019] The airbag 30, together with the gas supply passage 45 and the bag connecting portion 54, is formed from a woven fabric such as polyester. The peripheral wall 31 of the airbag 30 is formed from two pieces of woven fabric, namely, a front portion 31a constituting the front side of the front wall portion 34, the bottom wall portion 32, the side wall portions 35 (L, R), etc., and a rear portion 31b constituting the other rear wall portion 33 side (see FIG. 8).

[0020] The gas supply passage portion 45 is configured to include a bag side portion 46 connected to the airbag 30, and a cylindrical gas passage portion 47 extending from the bag side portion 46 toward the inflator 24. As described above, the gas passage portion 47 has a tip 47a connected to the pipe portion 26 of the inflator 24. The bag side portion 46 is provided with a communication port 46a that communicates with the inlet 40a of the inlet portion 40 of the airbag 30, and the periphery of the communication port 46a is sewn to the periphery of the inlet 40a, so that the bag side portion 46 is connected to the rear edge 32b side of the bottom wall portion 32 that constitutes the lower end 30a of the airbag 30.

[0021] The gas supply passage portion 45 is formed by sewing together the outer peripheral edges of an outer material 49 on the lower surface side and a bag side material 50 on the airbag 30 side, both having the same outer dimensions. Before sewing together the outer peripheral edges of the outer material 49 and the bag side material 50, the periphery of the communication port 46a of the bag side material 50 is sewn to the periphery of the inlet 40a of the airbag 30.

[0022] The bag connecting portion 54 connects the folded airbag 30 to the lap belt portion 13 so as to be slidable along the lap belt portion 13, and in the embodiment, is connected to the lower surface 32a side of the airbag 30 via the bag side portion 46 of the gas supply passage portion 45. The bag connecting portion 54 is formed into a cylindrical shape through which the lap belt portion 13 can be inserted by connecting predetermined outer peripheries of an occupant side portion 55 that covers the surface (occupant side) 13a of the lap belt portion 13 on the occupant MP side when worn, and a non-occupant side portion 58 that covers the surface (non-occupant side) 13b of the lap belt portion 13 opposite to the occupant MP and is connected to the airbag 30 side. In addition, the bag connection portion 54 does not directly connect the stitching portion 58a of the anti-occupant side portion 58 to the airbag 30, but connects it to the bag side portion 46 of the gas supply path portion 45, and in the embodiment, the bag connection portion 54 is indirectly connected to the airbag 30 via the gas supply path portion 45.

[0023] The occupant side portion 55 of the bag connecting portion 54 is configured to have a left side portion 56 and a right side portion 57 that are separated from each other in the left-right direction, with a gap 55a provided in the center in the left-right direction. The left side portion 56 and the right side portion 57 are disposed so as to be located closer to the center than both the left and right ends of the anti-occupant side portion 58.

[0024] As shown in Figures 7 and 8, this bag connection portion 54 is composed of a sheet-like material 60 having a substantially rectangular main body 61 and two protruding pieces 62 protruding from a front edge 61a in the width direction of the main body 61, and is formed by sewing the tip 62a of each protruding piece 62 of the sheet-like material 60 to the rear edge 61b side of the main body 61 by providing a sewing portion 63.

[0025] The bag cover 67 is disposed so as to cover the folded airbag 30 and the assembly portion 22 of the airbag 30 in the lap belt portion 13 in such a manner that the airbag 30 can protrude when inflated. In the case of the embodiment, the bag cover 67 also covers the bag side portion 46 of the gas supply passage portion 45 connected to the airbag 30 and the bag connecting portion 54. Unlike the material of the airbag 30, etc., the bag cover 67 is formed from a fabric that is used for the seat material of the seat 1 so as not to deteriorate the design.

[0026] Furthermore, the bag cover 67 includes an occupant-side panel portion 68 that is located on the occupant MP side when the lap belt portion 13 is worn, and an anti-occupant-side panel portion 70 that is located on the side away from the occupant MP, and is formed in a generally cylindrical shape through which the lap belt portion 13 can be inserted. The occupant-side panel portion 68 is provided with an exposure portion 75 that exposes the lap belt portion 13 so that a part 14 of the lap belt portion 13 can come into contact with the occupant MP.

[0027] In the embodiment, the bag cover 67 has the exposed portion 75 disposed between the opposing inner edges 56a, 57a of the left side portion 56 and the right side portion 57 of the bag connecting portion 54 (see FIGS. 4 to 6). That is, the bag cover 67 has insertion holes 72, 72 disposed on the opposing inner edges 56a, 57a of the left side portion 56 and the right side portion 57 of the bag connecting portion 54, respectively, for inserting the lap belt portion 13 from the inner circumference 67a side to the outer circumference 67b side of the bag cover 67. In the bag cover 67, the area between the insertion holes 72, 72 becomes an exposed area 75 that exposes the lap belt portion 13, and the area on the occupant side 13a of the exposed lap belt portion 13 becomes a contactable area 14 that can come into contact with the abdomen MB of the occupant MP when the lap belt portion 13 is worn, and the area on the anti-occupant side 13b of the lap belt portion 13 of the exposed area 75 is supported by the belt support surface 73 on the outer periphery 67b side of the bag cover 67 (see Figure 3).

[0028] In this embodiment, the contactable portion 14 of the lap belt portion 13 exposed by the exposed portion 75 of the bag cover 67 has a length L1 that corresponds to the width of the front side of the abdomen MB of the occupant MP and is set to about 300 mm. The length L0 of the bag cover 67 is set to about 500 mm (see FIG. 5).

[0029] This bag cover 67 is formed by sewing together, with sewing thread 78 (F, B), front edges 76a, 76a on one side in the width direction of cover material 76 (I, O) constituting the occupant side panel portion 68 and the anti-occupant side panel portion 70, and rear edges 76b, 76b on the other side. Slits 77 that form insertion holes 72, 72 are formed in the cover material 76I constituting the occupant side panel portion 68.

[0030] The slit 77 extends to one front edge 76a side.

[0031] In addition, the cover material 76I constituting the occupant side panel portion 68 and the cover material 76O constituting the anti-occupant side panel portion 70 are formed from fabric such as that used for the seat material of the seat 1, as described above.

[0032] When assembling the bag assembly 29 to the lap belt portion 13, first, the bag side portion 46 of the bag side material 50 of the gas supply path portion 45 is sewn to the inlet portion 40 of the airbag 30, and also, the anti-occupant side portion 58 of the bag connecting portion 54 before being made into a cylindrical shape is sewn to the bag side portion 46 of the outer material 49 of the gas supply path portion 45, and then the outer peripheral edges of the outer material 49 and the bag side material 50 are sewn together. As a result, the gas supply path portion 45 is formed, which is connected to the airbag 30 and to the bag connecting portion 54 before being made into a cylindrical shape. Then, the airbag 30 is folded, and then partially wrapped in a strip-shaped wrapping material (not shown) to prevent the airbag 30 from collapsing. After that, the tips 62a of the protruding pieces 62, 62 are sewn to the rear edge 62b of the main body 61 so that the assembly portion 22 of the lap belt portion 13 is wrapped by the bag connecting portion 54 before being made into a cylindrical shape, thereby forming the bag connecting portion 54. At this time, the portion of the belt support surface 73 between the insertion holes 72, 72 in the occupant side panel portion 68 (cover material 76I) of the bag cover 67 is inserted onto the anti-occupant side 13b of the lap belt portion 13, while the other portions of the cover material 76I are positioned on the underside 29b of the bag assembly 29, and further, the anti-occupant side panel portion 70 (cover material 76O) is positioned on the upper side 29a of the bag assembly 29 so as to cover the folded airbag 30.The front edges 76a, 76a and the rear edges 76b, 76b of the cover materials 76I, 76O are sewn together with sewing thread 78 (F, B) to form the bag cover 67 that covers the assembly portion 22 of the lap belt portion 13 together with the bag assembly 29. When this bag cover 67 is formed, the lap belt portion 13 is in a state in which the contactable portion 14 is exposed from the exposed portion 75 between the insertion holes 72, 72 of the bag cover 67, and the bag assembly 29 is arranged at the assembly portion 22 of the lap belt portion 13.

[0033] In the embodiment of the occupant protection device 10, as described above, the bag assembly 29 is assembled to the assembly portion 22 of the lap belt portion 13 of the seat belt 11 that has already been fastened to the seat 1, and the tip 47a of the gas supply passage portion 45 is connected to the pipe portion 26 of the inflator 24 using the clamp 27, so that the device can be mounted on the seat 1.

[0034] In the occupant protection device 10 of the embodiment, after being mounted on the seat 1, when the seat belt 11 is fastened to the occupant MP seated on the seat 1 by fastening the tongue 20 to the buckle 19, the lap belt portion 13 is exposed from the exposed portion 75 of the bag cover 67 and can come into contact with the occupant MP. That is, the lap belt portion 13 itself is made of the seat belt 11 having good sliding performance formed into a belt shape by weaving polyester fibers or the like, and the contactable portion 14 of the lap belt portion 13 exposed from the exposed portion 75 provided on the bag cover 67 reduces the contact area between the bag cover 67 and the occupant MP, and increases the contact area between the lap belt portion 13 (contactable portion 14) itself having good sliding performance and the occupant MP, thereby reducing the frictional resistance of the bag cover 67 against the occupant MP. Therefore, when the lap belt portion 13 is worn, the mounting portion 22 of the folded airbag 30 in the lap belt portion 13 can be smoothly positioned with respect to the occupant MP.

[0035] Therefore, in the embodiment of the occupant protection device 10, even if the folded airbag 30 is covered with the bag cover 67 and assembled to the lap belt portion 13, the frictional resistance of the bag cover 67 is reduced, and the lap belt portion 13 can be smoothly attached.

[0036] Then, when the occupant protection device 10 is activated after the seat belt 11 is fastened, the inflation gas from the inflator 24 flows into the airbag 30 from the inlet 40a of the inlet portion 40 via the gas supply passage portion 45, and the airbag 30 inflates while breaking or otherwise opening the bag cover 67, and completes the inflation (see FIGS. 9 and 10). Then, the airbag 30, which has completed the inflation, can smoothly receive and protect the upper body MU of the occupant MP on the occupant restraint surface 38.

[0037] Furthermore, the occupant protection device 10 of the embodiment includes a bag assembly 29 including an airbag 30, a bag connecting portion 54 attached to the airbag 30 and slidably connecting the folded airbag 30 to the lap belt portion 13, and a bag cover 67 covering the folded airbag 30 and the bag connecting portion 54 together with the assembly site 22 of the lap belt portion 13. The bag connecting portion 54 is configured into a cylindrical shape through which the lap belt portion 13 can be inserted by connecting the outer peripheral edges of an occupant side portion 55 covering the occupant side surface 13a of the lap belt portion 13 when worn and a non-occupant side portion 58 covering the surface 13b opposite to the occupant MP and connected to the airbag 30 side, and the occupant side portion 55 includes a left side portion 56 and a right side portion 57 separated from each other in the left and right directions. Furthermore, the bag cover 67 is configured so that the exposed portion 75 is disposed between the opposing inner edges 56a, 57a of the left side portion 56 and the right side portion 57 of the bag connecting portion 54, and insertion holes 72, 72 for inserting the lap belt portion 13 from the inner circumference 67a side to the outer circumference 67b side of the bag cover 67 are disposed on the opposing inner edges 56a, 57a side of the left side portion 56 and the right side portion 57 of the bag connecting portion 54.

[0038] Therefore, in the embodiment, the lap belt portion 13 is disposed from the inner periphery 67a side to the outer periphery 67b side of the bag cover 67 through the insertion holes 72, 72 of the bag cover 67 located on the mutually opposing inner edges 56a, 57a sides of the left side portion 56 and the right side portion 57 of the bag connecting portion 54 (see FIG. 6), so that the lap belt portion 13 can come into contact with the abdomen MB of the occupant MP through an exposed portion 75 between the left and right insertion holes 72, 72 of the bag cover 67. In this configuration, the airbag 30, the bag cover 67, and the bag connecting portion 54 that connects the folded airbag 30 to the lap belt portion 13 are integrally assembled to the lap belt portion 13 as a bag assembly 29, and can be moved along the lap belt portion 13. That is, the bag connecting portion 54, which connects the folded airbag 30 to the mounting portion 22 of the lap belt portion 13, is in a state in which the occupant side portion 55 and the anti-occupant side portion 58 wrap the lap belt portion 13 into a cylindrical shape, and therefore, with the airbag 30 attached, it can move along the lap belt portion 13 together with the bag cover 67. Of course, the bag connecting portion 54 does not slide along the lap belt portion 13 over its entire length, but a portion (gap 55a) that does not slide along the lap belt portion 13 is provided between the left side portion 56 and the right side portion 57 separated laterally in the occupant side portion 55 so as to provide an exposed portion 75, and the left side portion 56 and the right side portion 57 slide along the lap belt portion 13 over a small area, so that the sliding resistance against the lap belt portion 13 can be reduced, and the bag assembly 29 can be easily moved along the lap belt portion 13. In other words, in the occupant protection device 10 configured in this manner, even if the seated occupants MP have different physical builds, the bag assembly 29 can be moved along the lap belt portion 13, and the bag assembly 29 can be smoothly positioned near the center of the front of each of the occupants MP of different physical builds.

[0039] When the exposed portion is provided on the bag cover, the bag connecting portion may not be provided, and an opening for exposing the lap belt portion may simply be provided on the passenger side panel portion.

[0040] In addition, in cases where a gas generator or the like that supplies inflation gas is stored within the airbag, the bag assembly may be composed of the airbag, the bag connecting portion, and the bag cover without providing a gas supply path portion.

[0041] Furthermore, the seat belt to be fastened to the seat is not limited to the three-point type shown in Figs. 1 to 3, and the bag assembly 29 may be assembled to the lap belt portion of a two-point seat belt having no shoulder belt portion. [Explanation of symbols]

[0042] 1...seat, 10...occupant protection device, 13...lap belt portion, 13a...occupant side, 13b...opposite occupant side, 22...assembly portion, 29...bag assembly, 30...airbag, 54...bag connection portion, 55...occupant side, 56...left side, 56a...inner edge, 57...right side, 57a...inner edge, 58...opposite occupant side, 67...bag cover, 67a...inner circumferential surface, 67b...outer circumferential surface, 68...occupant side panel portion, 70...opposite occupant side panel portion, 72...insertion hole, 75...exposed portion, MP...crew member, MW...lower body, MU...upper body.

Claims

1. The seat belt has a lap belt portion that can be disposed in front of the hips of the occupant seated in the seat with both left and right ends connected to the left and right sides of the seat when the occupant wears the seat belt. an airbag that is attached to the lap belt portion and that, when activated, is inflated by an inflation gas flowing thereinto and is capable of receiving and protecting the upper body of an occupant moving forward; a bag cover that covers the folded airbag and an assembly portion of the lap belt portion to which the airbag is attached so as to allow the airbag to protrude when inflated; a bag connecting portion that is directly or indirectly connected to the airbag and slidably connects the folded airbag to the lap belt portion; An occupant protection device comprising: The bag cover is The seat belt has an occupant-side panel portion that is positioned on the occupant side when the lap belt portion is worn, and an anti-occupant-side panel portion that is positioned on the side away from the occupant, the occupant-side panel portion is provided with an exposure portion that exposes the lap belt portion so that a part of the lap belt portion can come into contact with an occupant, The occupant protection device according to claim 1, wherein the bag connecting portion and the folded airbag are covered by the occupant side panel portion and the anti-occupant side panel portion.

2. A lap belt portion of a seat belt that can be disposed in front of the hips of an occupant seated in the seat with both left and right ends connected to the left and right sides of the seat when the occupant is wearing the seat belt, an airbag that is attached to the lap belt portion and that, when activated, is inflated by an inflation gas flowing thereinto and is capable of receiving and protecting the upper body of an occupant moving forward; a bag cover that covers the folded airbag and an assembly portion of the lap belt portion to which the airbag is attached so as to allow the airbag to protrude when inflated; An occupant protection device comprising: The bag cover is The seat belt has an occupant-side panel portion that is positioned on the occupant side when the lap belt portion is worn, and an anti-occupant-side panel portion that is positioned on the side away from the occupant, the occupant-side panel portion is provided with an exposure portion that exposes the lap belt portion so that a part of the lap belt portion can come into contact with an occupant, The airbag; a bag connecting portion attached to the airbag and slidably connecting the folded airbag to the lap belt portion; a bag cover that covers the folded airbag and the bag connecting portion together with the assembly portion of the lap belt portion; A bag assembly comprising: the bag connecting portion is configured to have a cylindrical shape through which the lap belt portion can be inserted, by connecting the outer peripheral edges of an occupant side portion that covers the occupant side surface of the lap belt portion when worn and an anti-occupant side portion that covers the surface opposite to the occupant and is connected to the airbag side, and The occupant side portion includes a left side portion and a right side portion separated from each other in the left and right directions, an exposed portion of the bag cover disposed between the opposing inner edges of the left side and the right side of the bag connecting portion, and an insertion hole for inserting the lap belt portion from the inner side to the outer side of the bag cover is disposed on each of the opposing inner edges of the left side and the right side of the bag connecting portion, such that the exposed portion is disposed between the opposing inner edges of the left side and the right side of the bag connecting portion.

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