Occupant protection device

Abstract

To provide an occupant protection device that is configured so that a conduit part is not disturbed from inflating when gas for inflation is introduced, while restricting the conduit part from passing around a side of a seating part.SOLUTION: An occupant protection device S comprises: an airbag 25, arranged in a region of a lap belt 10 that restricts the waist of an occupant, which inflates / can inflate enough / sufficiently to protect an upper body MU of an occupant MP; and an inflator 17 that supplies gas for inflating / inflation to the airbag 25, which further comprises a guide member 80 that restricts / regulates a position of a conduit part 40 with flexibility through which gas for inflation is flown into a bag main body 26 of the airbag 25. The guide member 80 comprises a base part 81 that is fixed to a seating part 3 and a pair of position regulating pieces 83A and 83B in a cantilever shape supported on / at the base part 81. The conduit part 40 is stored in a storage recessed part 86 formed between the pair of position regulating pieces 83A and 83B. The pair of position regulating pieces 83A and 83B are constituted to be able to receive pressing force when the conduit part 40 inflates to deform in a direction of expanding the storage recessed part 86.SELECTED DRAWING: Figure 2

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 an occupant protection device that is configured to include an airbag that is placed in the area of ​​the lap belt that restrains the occupant's waist when the seat belt is fastened (see, for example, Patent Document 1). In this occupant protection device, the airbag inflates forward and upward from the lap belt when deployed and inflated, and protects the occupant's upper body when fully inflated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-66425 Summary of the Invention [Problem to be solved by the invention]

[0004] In the passenger protection device described in Patent Document 1, inflation gas generated by an inflator body attached to the back side of the seat below the sitting portion is guided through a metal pipe and a flexible conduit above the sitting portion and to the front side of the backrest, and is supplied to an airbag (more specifically, to the bag body that deploys and inflates) located in the lap belt area. In a passenger protection device configured in this manner, if a side cover is attached to the side of the sitting portion, the conduit connecting the inflator body and the airbag body must be arranged within the limited space inside the side cover so that its inflation is not hindered. However, the conduit itself is weak and prone to swinging, making it difficult to maintain its position. Therefore, when attaching the side cover to the seat, care must be taken to ensure that the conduit, which may be out of position, does not get caught between the conduit and surrounding components, making it difficult to attach the side cover.

[0005] The present invention solves such problems and aims to provide an occupant protection device that restricts the conduit portion from coming into contact with the side of the seat, while not hindering the expansion of the conduit portion when inflation gas is introduced. [Means for solving the problem]

[0006] The occupant protection device according to the present invention comprises a seat belt and an airbag disposed in a region of a lap belt of the seat belt that restrains the waist of the occupant when the seat belt is fastened, the airbag inflating to protect the upper body of the occupant; an inflator that supplies inflation gas to the airbag; Equipped with The airbag, a bag body that is disposed to cover the front of the occupant when inflation is complete; a flexible conduit portion that allows the inflation gas discharged from the inflator to flow into the bag body; An occupant protection device configured to include: a guide member for defining the position of the conduit portion on the side of the seat portion; The guide member comprises a base fixed to the seat and a pair of cantilevered position control pieces supported by the base, and the conduit portion is accommodated in an accommodating recess formed between the pair of position control pieces, and the pair of position control pieces are configured to be deformable in a direction widening the accommodating recess when subjected to a pressing force when the conduit portion expands.

[0007] According to the occupant protection device of the present invention, the conduit portion, which is weak and prone to swinging, can be temporarily fixed in a state where it is accommodated in an accommodating recess formed between a pair of position-regulating pieces of the guide member, thereby avoiding the problem of the conduit portion getting caught when attaching the side cover to the seat portion. Furthermore, the pair of position regulating pieces that regulate the position of the conduit section are configured to be deformable in a direction that widens the accommodating recess when subjected to the pressing force when the conduit section expands, thereby preventing the position regulating pieces from interfering with the expansion of the conduit section.

[0008] At least one of the pair of position restricting pieces may have a weakened portion formed at the base end thereof, the thickness of which is locally reduced. In this way, when a pressing force is applied from the conduit portion, the position restricting piece can be deformed starting from the weakened portion provided at the base end portion.

[0009] In the passenger protection device of the present invention, the pair of position restriction pieces may be configured so that the distance between the inner surfaces of the opposing position restriction pieces gradually changes along the direction in which the conduit portion is disposed. In this way, the pressing force immediately after the conduit portion begins to expand can be concentrated in the area where the distance between the inner surfaces of the position regulating piece is short, and deformation of the position regulating piece can be stably caused by this area.

[0010] In the passenger protection device of the present invention, the pair of position restriction pieces may be made of a rubber material that is elastically deformable when subjected to a pressing force when the conduit portion expands.

[0011] In addition, in the occupant protection device of the present invention, each of the pair of position control pieces can be formed in an arc shape so that the inner side facing the conduit portion is concave and the outer side is convex, and the base ends of each piece can be joined together. In this way, even when the pair of position regulating pieces are deformed in the direction of widening the accommodating recess, the protrusion of the tip portions is suppressed, thereby avoiding interference between the tip portions of the position regulating pieces and surrounding components. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a seat equipped with an occupant protection device according to an embodiment of the present invention; [Figure 2] 2A is a side view of the sheet of FIG. 1, and FIG. 2B is a view showing the guide member in FIG. 2A together with the conduit portion. [Figure 3] FIG. 2 is a front view of the seat of FIG. 1, showing the state in which the seat belt is fastened. [Figure 4] FIG. 2 is a perspective view showing a state in which the inflator is attached to a seat frame. [Figure 5] In the cross-sectional view along the arrows VV in Figure 2, A shows the state in which the conduit portion is not expanded, and B shows the state in which the conduit portion is expanded. [Figure 6] 2 is a schematic perspective view showing a state in which an airbag used in the occupant protection device of FIG. 1 is inflated by itself. FIG. [Figure 7] FIG. 7 is a schematic vertical cross-sectional view of the airbag of FIG. 6. [Figure 8] FIG. 7 is a plan view showing a base fabric constituting the airbag of FIG. 6. [Figure 9] 3 is a side view of the seat in the passenger protection device of the embodiment, in a state where the airbag has completed inflation. FIG. [Figure 10] 10A and 10B are diagrams showing modified examples in which the distance between the inner surfaces of a pair of position restricting pieces in the guide member is changed. [Figure 11] 10A and 10B are diagrams showing a modified example in which a pair of position restricting pieces in the guide member are made of rubber material. [Figure 12] 10A and 10B are diagrams showing a modified example in which a pair of position restricting pieces in the guide member are configured to be C-shaped. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present invention will be described below with reference to the drawings. As shown in Figures 1 to 3, an occupant protection device S of this embodiment is mounted on a vehicle seat 1 and includes a seat belt 7, an airbag 25, and an inflator 17. The seat 1 equipped with this occupant protection device S includes a backrest 2 and a seat 3, and a resin side cover 5 is provided on the left side of the seat 3 to cover the side of the seat 3. The side cover 5 is fixed to the skeleton frame (seat frame 4) of the seat 3 using a fixing tool (not shown).

[0014] The seat belt 7 is configured to include a belt body 8 for restraining an occupant MP seated in the seat 1, a tongue plate 12 attached to the belt body 8, and a buckle 13 for connecting the tongue plate 12. One end of the belt body 8 is fastened to a winding shaft of a retractor (not shown) disposed in the backrest 2, and the other end is fastened to an anchor member 14 (see FIG. 2) disposed on the left side of the rear end 3b of the seat portion 3 of the seat 1. More specifically, the belt body 8 is disposed so as to be exposed to the outside from the upper left edge side of the backrest 2. In this embodiment, when an occupant is not seated, the lap belt 10 for deploying the airbag 25 is exposed in front of the backrest 2 as shown in FIGS. The belt main body 8 has a lap belt 10 and a shoulder belt 9 stored in the backrest 2. When the occupant is seated, with the tongue plate 12 connected to the buckle 13, the lap belt 10, which is disposed between the anchor member 14 and the buckle 13 and extends substantially along the left-right direction, restrains the lower body MD (waist) of the occupant MP, and the shoulder belt 9, which extends from the upper left edge of the backrest 2 and is disposed diagonally to the buckle 13, restrains the upper body MU (head MH and area from the shoulders to the chest MB) of the occupant MP (see FIG. 3). Note that in the seatbelt 7, a retractor (not shown) disposed in the backrest 2 has a pretensioner mechanism. In addition, the occupant MP can release the fastening state of the tongue plate 12 with respect to the buckle 13 by pressing a release button (not shown) provided on the buckle 13, thereby removing the tongue plate 12 from the buckle 13.

[0015] The inflator 17 supplies inflation gas to the airbag 25. In this embodiment, the inflator 17 includes an inflator body 18 that generates inflation gas, and a pipe portion 19 that extends from the inflator body 18 and guides the inflation gas into the airbag 25. In this embodiment, the inflator 17 is set to start operating later than the pretensioner mechanism of the seatbelt 7 in order to restrict the belt body 8 of the seatbelt 7 from being pulled out as the airbag 25 is inflated. Specifically, the inflator 17 is set to start operating 5 ms after the pretensioner mechanism of the seatbelt 7 is activated.

[0016] The inflator 17 is attached to the seat frame 4 that supports the seat 1 (more specifically, the seat portion 3) at a position below the seat surface 3a of the seat 1, and is capable of moving together with the seat 1, even when the seat 1 is slid back and forth or rotated, for example.

[0017] 4 shows the inflator 17 attached to the seat frame 4. As shown in the figure, the inflator body 18 is a generally cylindrical cylinder type, and is provided on the rear side below the seat 3 with its axial direction generally aligned with the left-right direction.

[0018] The inflator body 18 is fixed to a mounting plate portion 70 of the seat frame 4 at two axially spaced locations using fixing members 65. The fixing members 65 are bolted clamps that include a ring-shaped clamp 66 that can be contracted in diameter and a bolt (not shown) that protrudes radially outward from the outer circumferential surface of the clamp 66.

[0019] The pipe portion 19 is a metal tube formed by bending in multiple stages, one end 19a of which is connected to the inflator body 18. The end 19a connected to the inflator body 18 is an enlarged diameter portion, and is crimped while fitted onto the gas discharge port provided on one end of the inflator body 18, forming a crimped joint 76. At the crimped joint 76, the end 19a of the pipe portion 19 is connected to the inflator body 18.

[0020] The pipe portion 19 includes a first extending portion 20a that includes an end portion 19a and extends horizontally, as well as a second extending portion 20b and a third extending portion 20c that extend in different directions. As shown in FIG. 4, the pipe portion 19 extends horizontally from the inflator body 18, then changes direction forward at a first bent portion 19b, so that the second extending portion 20b extends forward. The second extending portion 20b then changes direction upward at a second bent portion 19c on the side of the seat 3, so that the third extending portion 20c extends upward. The tip of the bent pipe portion 19 is connected to the flexible conduit 40 of the airbag 25 using a clamp 62.

[0021] 2A, the upstream portion of conduit 40 (the portion close to the connection with pipe 19) is disposed in an area covered by side cover 5 on the side of seat 3. In this embodiment, a resin guide member 80 is provided to determine the position of conduit 40 in order to prevent conduit 40 from swinging around and shifting from its predetermined position when it is not stiff.

[0022] As shown in Fig. 2B and Fig. 5A, the guide member 80 includes a base 81 fixed to the side surface 3c of the seat 3, and a pair of position restriction pieces 83A, 83B spaced apart in the seat front-rear direction. The pair of position restriction pieces 83A, 83B are each plate-like members extending in a direction substantially perpendicular to the side surface 3c of the seat 3 and in the up-down direction, which is the direction in which the conduit 40 is disposed, and are cantilevered with their base ends 84 fixed to the base 81. The position restriction pieces 83A, 83B are spaced apart and substantially parallel to each other in the seat front-rear direction, and the area between the pair of position restriction pieces 83A, 83B defines an accommodation recess 86 that accommodates the conduit 40. An opening 87 that communicates the interior and exterior of the accommodation recess 86 is defined between the tips of the pair of opposing position restriction pieces.

[0023] When the conduit portion 40 is arranged to the side of the seat portion 3, the conduit portion 40 can be folded in the front-to-rear direction of the seat 1 to reduce its width dimension in the front-to-rear direction, as shown in A of Figure 5, and can be stored and held in the storage recess 86. Prior to attaching the side cover 5 to the seat portion 3, as shown in Figure 5A, if the conduit portion 40 in a limp state is temporarily fixed in the accommodating recess 86, the position regulating piece 83A located in front of the conduit portion 40 and the position regulating piece 83B located in the rear of the conduit portion 40 will prevent the conduit portion 40 from swinging, thereby avoiding the occurrence of problems such as the conduit portion 40 being unintentionally caught in a position that is out of position when the side cover is attached.

[0024] Furthermore, in guide member 80, base ends 84 of position restriction pieces 83A, 83B are formed with weakened portions 85 that are locally reduced in thickness by, for example, providing notches along the arrangement direction of conduit portion 40 (in this embodiment, the up-and-down direction of sheet 1). Therefore, in this embodiment, when subjected to a pressing force when conduit portion 40 expands, each of position restriction pieces 83A, 83B is bent and deformed in a direction that widens accommodating recess 86, starting from weakened portions 85 provided at base ends 84, as shown in Fig. 5B, thereby preventing a situation in which position restriction pieces 83A, 83B interfere with the expansion of conduit portion 40.

[0025] Next, the airbag 25 will be described. The airbag 25 is folded into a long shape and placed in the area of ​​the lap belt 10 so as to overlap the upper surface of the lap belt 10 when the seat belt 7 is fastened (see FIG. 3). That is, in the unfastened state as shown in FIG. 1, the airbag 25 is placed on the rear side of the lap belt 10 (the side of the backrest 2). In this embodiment, the airbag 25 and the lap belt 10 are covered and integrated with each other by a cover 22 that can be broken when the airbag 25 is deployed and inflated, as shown in FIG. That is, in this embodiment, the gap between the lap belt 10 and the cover 22 forms a storage area for storing the airbag 25.

[0026] As shown in Figures 6 and 7, the airbag 25 includes a bag body 26, a conduit portion 40 connected to the inflator 17 to allow inflation gas to flow into the bag body 26, and a belt attachment portion 47 through which the lap belt 10 is inserted.

[0027] The bag body 26 has an outer shape, when fully inflated, that is a substantially triangular prism with its axial direction aligned substantially along the left-right direction. More specifically, the bag body 26 is configured so that, when viewed from the left or right side, the fully inflated shape is a substantially right-angled triangle with its hypotenuse at the front, and when viewed from the front-rear direction, the fully inflated shape is a substantially rectangular shape that is wider in the vertical direction (see FIGS. 3 and 9). The bag body 26 includes a front wall 27 that is positioned in front and away from the occupant MP when fully inflated, a rear upper wall 28 and a rear lower wall 29 that are positioned toward the occupant MP when fully inflated, and a left wall 30 and a right wall 31 that are positioned opposite each other in the left-right direction when fully inflated. 6 and 7 , the bag body 26 has a communication hole 33 communicating with the conduit 40 on the underside of the rear end 29a of the rear lower wall 29, and is connected to the conduit 40 at the periphery of the communication hole 33. In this embodiment, the communication holes 33 are circular, and two are arranged side by side on the left and right sides of the bag body 26, approximately symmetrically, about the left and right center of the bag body 26. Vent holes 34, 34 are formed near the top and bottom centers on both left and right edges of the front wall 27 for venting excess inflation gas. In the bag body 26 of this embodiment, the rear lower wall 29 defines a leg contact surface 36 that can contact the upper surfaces of the legs (thighs) of the occupant MP when fully inflated, and the rear upper wall 28 defines an upper body restraint surface 37 that is positioned in front of the occupant MP when fully inflated and can restrain the occupant MP from the chest to the head. In this embodiment, the rear upper wall portion 28 and the rear lower wall portion 29 have an outer shape when the bag body 26 is fully inflated that is generally rectangular with its longitudinal direction generally aligned along the front-rear direction or the up-down direction, and are configured so that their width dimensions in the longitudinal direction are the same, as shown in Fig. 7. The rear upper wall portion 28 is configured so that its upper end 28a is positioned in front of the head MH of the occupant when the bag body is fully inflated (see Fig. 9). Furthermore, the rear upper wall portion 28 and the rear lower wall portion 29 are configured to be positioned generally perpendicular to each other in the cross-sectional shape of the bag body 26 when it is fully inflated (see Fig. 7).

[0028] Conduit 40 is connected to pipe 19 of inflator 17, has a closed tip 40b connected to bag body 26, and an open base 40a connectable to pipe 19. Conduit 40 is arranged in the left-right direction substantially along lap belt 10 when airbag 25 is fully inflated. As shown in FIG. 6 , the region of conduit 40 on the tip 40b side is arranged on the underside of bag body 26 when airbag 25 is fully inflated. This region on the tip 40b side is wider to form gas reservoir 41 that temporarily stores inflation gas that has flowed into it. Conduit 40 is connected at its base 40a side to pipe 19 of inflator 17 using clamp 62, as described above. The width of gas reservoir 41 is set to be approximately twice the width of the portion of conduit 40 on the base 40a side. The gas storage section 41 is configured so that its width in the left-right direction is approximately the same as the width in the left-right direction of a portion of the bag body 26 on the rear lower edge side (near the portion where the communication hole 33 is located) (see FIG. 6). The gas storage section 41 is formed with an opening 41a that corresponds to the communication hole 33 formed in the bag body 26. In this embodiment, the conduit section 40 is formed in a cylindrical shape by joining the peripheries of an upper wall section 43 and a lower wall section 44, which have the same outer shape, and the opening 41a is formed in the region of the upper wall section 43. The entire periphery of the opening 41a is joined (sewn) to the periphery of the communication hole 33.

[0029] The belt attachment portion 47 is disposed on the lower surface (lower wall 44 side) of the gas storage portion 41 area of ​​the conduit 40, and is sewn to the lower wall 44 in a generally cylindrical shape with both ends open so that the lap belt 10 can be inserted therethrough (see FIGS. 6 and 7). The length of the belt attachment portion 47 is set slightly smaller than the width of the gas storage portion 41 in the left-right direction. In other words, the length of the belt attachment portion 47 in the direction parallel to the lap belt 10 is set larger so that the bag main body 26 does not rise excessively above the lap belt 10 when deployed and inflated.

[0030] 7 and 8, the airbag 25 of this embodiment is formed by joining the peripheral edges of a base fabric of a predetermined shape, and in this embodiment, as shown in Figures 7 and 8, is composed of two occupant-side panels 50 and a front panel 55 that constitute the bag body 26, two conduit panels 57 and 58 that constitute the conduit 40, and a belt attachment panel 60 that constitutes the belt attachment part 47. The occupant-side panel 50, the front panel 55, the conduit panels 57 and 58, and the belt attachment panel 60 are each formed from flexible woven fabric made of polyester yarn, polyamide yarn, or the like.

[0031] In the occupant protection device S of this embodiment, when the inflator 17 is activated while the device is mounted on the vehicle, the inflation gas discharged from the inflator 17 flows into the bag body 26 via the pipe 19 and the conduit 40. At this time, the pair of position restriction pieces 83A, 83B that restricted the position of the conduit 40 inside the side cover 5 are subjected to a pressing force when the conduit 40 is inflated, and are deformed in a direction that widens the accommodation recess 86, as shown in FIG. 5B, and therefore do not hinder the inflation of the conduit 40. Then, the bag body 26 into which the inflation gas has flowed breaks the cover 22, protruding forward and upward from the lap belt 10, and completing inflation as shown in FIG.

[0032] According to the occupant protection device S of this embodiment configured as described above, the conduit portion 40, which is weak and prone to swinging, can be temporarily fixed in a state where it is accommodated in the accommodation recess 86 formed between the pair of position control pieces 83A, 83B of the guide member 80, thereby avoiding the problem of the conduit portion 40 getting caught between surrounding components when attaching the side cover 5 to the seat portion 3. Furthermore, the pair of position control pieces 83A, 83B that control the position of the conduit section 40 are configured to be deformable in the direction of widening the accommodating recess 86 when subjected to the pressing force when the conduit section 40 expands, thereby preventing the position control pieces 83A, 83B from interfering with the expansion of the conduit section.

[0033] According to the occupant protection device S of this embodiment, a weak portion 85 with a locally thin thickness is formed at the base end 84 of each of the pair of position control pieces 83A, 83B, so that when subjected to pressing force from the conduit portion 40, each of the position control pieces 83A, 83B can be bent and deformed starting from the weak portion 85 provided at the base end 84.

[0034] Next, a modification of this embodiment will be described. Fig. 10 is a diagram showing a modification in which the distance between the inner surfaces of a pair of position restriction pieces 83A, 83B of guide member 80 gradually changes along the direction in which conduit section 40 is disposed. In the example of Fig. 10, position restriction pieces 83A, 83B are provided at an angle so that the distance between the inner surfaces of the pair of opposing position restriction pieces 83A, 83B becomes shorter as they move upward. In the example of Figure 10, when the conduit portion 40 begins to expand, the pressing force is first concentrated on the upper ends of the position control pieces 83A, 83B, which have the shortest distance between their inner surfaces, and these upper ends can trigger stable deformation of the position control pieces 83A, 83B.

[0035] Fig. 11 is a diagram showing a modified example in which a pair of position restriction pieces 83A, 83B of guide member 80 are made of rubber material. In the above embodiment, guide member 80 is made of resin material, but in the example of Fig. 11, position restriction pieces 83A, 83B are made of rubber material that is separate from resin base 81. In the example of Fig. 11, when a pressing force is applied from conduit portion 40, pair of position restriction pieces 83A, 83B can elastically deform in a direction that widens accommodating recess 86, as shown by the two-dot chain line in the figure.

[0036] FIG. 12 is a diagram showing a modified example in which a pair of position restriction pieces 83A, 83B of guide member 80 are configured in a C-shape. In the above embodiment, position restriction pieces 83A, 83B are provided substantially parallel and spaced apart. However, as shown in the example of FIG. 12, each of position restriction pieces 83A, 83B may be formed in an arc shape so that the inner side facing conduit 40 is concave and the outer side is convex, and the base ends of position restriction pieces 83A, 83B may be joined together to form the entire pair of position restriction pieces 83A, 83B in a C-shape. In this way, when position restriction pieces 83A, 83B open outward under pressure from conduit 40, protrusion of the tip portions is suppressed, thereby preventing interference between the tip portions of position restriction pieces 83A, 83B and surrounding components.

[0037] The above describes the embodiment and its modified examples of the present invention, but these are merely examples. The shape of the position restriction pieces in the guide member is not limited to the above embodiment and its modified examples and can be modified as appropriate. For example, in the above embodiment, the tips of the pair of position restriction pieces 83A, 83B are spaced apart, and openings communicating with the inside and outside are formed therein. However, to prevent the conduit 40 from slipping out of the accommodating recess 86, the tips can be made to substantially contact each other, and the entire circumference of the conduit 40 can be surrounded by the guide member 80. In the above embodiment, the weak portion 85 is provided at the base end of each of the pair of position restriction pieces 83A, 83B, but in some cases it is also possible to provide the weak portion 85 on only one of the position restriction pieces. Furthermore, the present invention can be implemented in various modified forms within the scope of its intent, such as partial substitution or combination of the configurations shown in the above-mentioned embodiments and their modified examples. [Explanation of symbols]

[0038] 1...seat, 3...seat portion, 3c...side surface, 5...side cover, 10...lap belt, 17...inflator, 19...pipe portion, 25...airbag, 26...airbag body, 40...duct portion, 80...guide member, 81...base portion, 83A, 83B...position restriction piece, 84...base end portion, 85...weak portion, 86...accommodating recess, MP...occupant, S...occupant protection device.

Claims

1. Seat belts and an airbag disposed in a region of a lap belt of the seat belt that restrains the waist of the occupant when the seat belt is fastened, the airbag inflating to protect the upper body of the occupant; an inflator that supplies inflation gas to the airbag; Equipped with The airbag, a bag body that is disposed to cover the front of the occupant when inflation is complete; a flexible conduit portion that allows the inflation gas discharged from the inflator to flow into the bag body; An occupant protection device configured to include: a guide member for defining the position of the conduit portion on the side of the seat portion; The guide member comprises a base portion fixed to the seat portion and a pair of cantilevered position regulating pieces supported by the base portion, the conduit portion is accommodated in an accommodating recess formed between the pair of position regulating pieces, and the pair of position regulating pieces are configured to be deformable in a direction widening the accommodating recess when subjected to a pressing force when the conduit portion expands.

2. 2. The passenger protection device according to claim 1, wherein a weakened portion having a locally reduced thickness is formed at a base end portion of at least one of the pair of position restriction pieces.

3. 2. The passenger protection device according to claim 1, wherein the pair of position restriction pieces are configured such that the distance between the inner surfaces of the opposing position restriction pieces gradually changes along the direction in which the conduit portion is disposed.

4. 2. The passenger protection device according to claim 1, wherein the pair of position restriction pieces are made of a rubber material that is elastically deformable when subjected to a pressing force when the conduit portion expands.

5. The occupant protection device according to claim 1, characterized in that the pair of position restriction pieces are each formed in an arc shape so that the inner side facing the conduit portion is concave and the outer side is convex, and their base ends are joined together.

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