JP6658404B2 - Vehicle occupant restraint system - Google Patents

Description

  The present invention relates to a vehicle occupant restraint system.

  2. Description of the Related Art In recent years, in order to improve the restraint performance of an emergency seat belt device in an automobile, a vehicle occupant restraint device (air belt) that inflates an airbag with gas along a seat belt that restrains a passenger has been proposed.

  However, since the air belt is inflated, the restraining pressure on the occupant's body increases. For this reason, there is a possibility that the shoulder belt strongly presses the ribs, causing large deformation of the chest (hereinafter referred to as “chest flexion”).

  Therefore, for example, Patent Literature 1 proposes an airbelt in which the width of the occupant in the front-rear direction at the shoulder (main inflation portion) of the occupant is set to be larger than that in the chest (gas supply passage). Have been. It is described that by this, when the air belt is inflated, the pressure generated on the occupant can be received by the relatively strong shoulder in the skeleton of the human body.

JP-A-2013-123915

  However, in the above prior art, since the positions of the main inflatable portion and the gas supply path on the air belt are fixed, the main inflatable portion may restrain the chest depending on the physique of the occupant. Further, although the restraining pressure is lower than that of the shoulder (main inflatable portion), the restraining pressure due to the expansion of the air belt also acts on the vicinity of the sternum, which may cause large chest flexion.

  Therefore, the above prior art has room for improvement in suppressing chest flexion.

  The present invention has been made in view of the above circumstances, and has as its object to provide a vehicle occupant restraint device that reduces a pressing force acting on the vicinity of the sternum of an occupant from the shoulder belt side of a three-point seat belt at the time of a frontal collision.

The invention according to claim 1 includes a shoulder belt extending from a shoulder anchor located above and outside a vehicle width direction of a seat back constituting a vehicle seat on which an occupant sits, toward a buckle at a lower portion inside the vehicle width direction. A point-type seat belt, a belt guide provided on the upper surface of the seat back in the vehicle width direction, and a belt guide through which the shoulder belt is inserted, and an end fixed to the belt guide while the shoulder belt is inserted; Bulging means provided along the shoulder belt from the belt guide to the buckle side in a range of the shoulder of the occupant, and bulging means bulging to the occupant side at the time of a frontal collision , wherein the bulging means comprises: A belt insertion portion provided along the belt, through which the shoulder belt is inserted, and the belt insertion portion separated from the belt insertion portion by a predetermined distance. A resin plate provided on the occupant side in parallel with the portion and having a lower rigidity than the belt insertion portion, a guide member having ends fixed to the belt insertion portion and the resin plate, and the guide member at the time of a frontal collision. And a drive unit for displacing the belt insertion unit and the resin plate to separate from each other .

  According to this configuration, the shoulder belt of the three-point seat belt is inserted with the belt guide disposed outside the upper surface of the seat back in the vehicle width direction. When the occupant is restrained by the three-point seat belt, the swelling means provided from the belt guide to the buckle side along the shoulder belt over the area of the occupant's shoulder is provided at a fixed position with respect to the seat back. Therefore, regardless of the occupant's body type, it is arranged at a position facing the shoulder of the occupant.

  If a frontal collision occurs in this state, the swelling means swells toward the occupant. As a result, the shoulder of the occupant is pressed by the swelling means with a high pressure and is restrained. On the other hand, the shoulder belt is separated from the shoulder (occupant) as the swelling means expands. Therefore, even in the vicinity of the sternum adjacent to the buckle (under the vehicle) of the occupant's shoulder, the shoulder belt is separated from the occupant. As described above, the swelling means provided along the shoulder belt at the time of a frontal collision swells to apply a high pressing force to the relatively strong shoulder in the human body, and also to the vicinity of the relatively low strength sternum. By pressing the shoulder belt away from the nipple, it is possible to reduce or prevent the pressing force from acting near the sternum.

  Since the vehicle occupant restraint device according to the first aspect of the present invention is configured as described above, it is possible to reduce or prevent the pressing force acting on the vicinity of the sternum of the occupant restrained by the three-point seat belt at the time of a frontal collision.

1 is a schematic perspective view showing a vehicle seat provided with a vehicle occupant restraint device according to a first embodiment of the present invention. It is a figure which shows the restraint state of the seat belt with respect to the occupant in the vehicle occupant restraint device concerning 1st Embodiment of this invention, (A) is a front view of an initial state, (B) is a side view of an initial state. (C) is a side view showing a swelling completed state. (A) showing the initial state of the swelling device according to the first embodiment of the present invention is an enlarged sectional view of a main part, and (B) is a sectional view taken along line JJ of (A). It is a figure corresponding to Drawing 3 (A) showing the swelling start state of the swelling device concerning a 1st embodiment of the present invention. FIG. 3A is a view corresponding to FIG. 3A showing a bulging completion state of the bulging device according to the first embodiment of the present invention, and FIG. 3B is a cross-sectional view taken along line KK of FIG. is there. It is a figure corresponding to Drawing 3 (A) showing an initial state of an expansion device concerning a 2nd embodiment of the present invention. It is a figure corresponding to Drawing 5 (A) which shows a swelling completion state of a swelling device concerning a 2nd embodiment of the present invention. It is a figure corresponding to Drawing 3 (A) showing an initial state of an expansion device concerning a 3rd embodiment of the present invention. It is a figure corresponding to Drawing 5 (A) which shows a swelling completion state of a swelling device concerning a 3rd embodiment of the present invention. It is a figure corresponding to Drawing 3 (A) showing an initial state of a swelling device concerning a 4th embodiment of the present invention. It is a figure corresponding to Drawing 5 (A) which shows a swelling completion state of a swelling device concerning a 4th embodiment of the present invention.

[First Embodiment]
A vehicle occupant restraint system according to a first embodiment of the present invention will be described with reference to FIGS. In addition, each drawing is a schematic one, and illustrations that are not relevant to the present invention are omitted. Further, in FIG. 1, illustration of an occupant P described later is omitted. 1 to 5, the arrow FR indicates the front of the vehicle, the arrow OUT indicates the outer side in the vehicle width direction, and the arrow UP indicates the upper side of the vehicle. Further, in the present embodiment, the front of the seat, the width direction of the seat, and the upper side of the seat substantially correspond to the front of the vehicle, the width direction of the vehicle, and the upper side of the vehicle, respectively. I do.

(Constitution)
As shown in FIG. 1, a vehicle occupant restraint system 10 for an automobile according to the present embodiment is provided on a vehicle seat 12 on a driver's seat side on the right side of a vehicle front seat in a cabin.

  The vehicle seat 12 includes a seat cushion 14 on which an occupant sits, a seat back 16 that supports the back of the seated occupant at a rear end of the seat cushion 14, and a head of the seated occupant disposed at an upper end of the seat back 16. And a headrest (not shown) for supporting.

  A belt guide 18 through which a seat belt 22 described later is inserted and guided is formed on the upper surface 16A of the seat back 16 on the outer side in the vehicle width direction (of the headrest).

  The seat belt device 20 provided for the vehicle seat 12 is a so-called three-point seat belt, and includes a seat belt 22, an anchor plate 24 to which one end of the seat belt 22 is locked, and a seat belt 22. A retractor 26 having a pretensioner function for locking the other end and applying a predetermined tension to the seatbelt 22; a shoulder anchor 28 for folding the seatbelt 22 at an upper portion (pillar) outside the vehicle seat 12 in the vehicle width direction; And a buckle 32 fixed by fitting the tongue plate 30 inserted into the seat belt 22.

  A portion of the seat belt 22 from the shoulder anchor 28 to the buckle 32 is called a shoulder belt portion 22A, and a portion from the buckle 32 to the anchor plate 24 is called a lap belt portion 22B.

  As shown in FIGS. 2 (A) and 2 (B), the shoulder belt portion 22A extends obliquely from the front to the waist L of the occupant P from the upper outer side in the vehicle width direction to the lower waist L of the inner side in the vehicle width direction. Is to be restrained.

  Further, as shown in FIG. 1, the vehicle occupant restraint device 10 is provided with a swelling device 40 which is a feature of the present invention. The swelling device 40 has one end fixed to the belt guide 18 and is disposed along the shoulder belt portion 22 </ b> A from the belt guide 18 to the buckle 32 over a range of the shoulder S of the occupant P.

  As shown in FIG. 3A, the swelling device 40 is disposed along the shoulder belt portion 22A, and swells out from the shoulder belt portion 22A side toward the occupant P at the time of a frontal collision. And a drive unit 44 for causing the bulging portion 42 to bulge and deform.

  As shown in FIGS. 3A and 3B, the bulging portion 42 has a rectangular cross section in which a through hole 46 into which the seat belt 22 (shoulder belt portion 22A) is displaceably inserted is formed. An insertion portion 48, a resin plate 50 disposed parallel to the belt insertion portion 48 at a predetermined distance downward (occupant side), a cushion member 52 joined to the lower surface of the resin plate 50, and a belt insertion portion 48. And a pair of wall portions 54, 54 having one end joined to both side surfaces in the vehicle width direction of the cushion member 52 and the other end joined to both end surfaces in the vehicle width direction of the cushion material 52. The resin plate 50 is joined only to the vehicle front side of the cushion material 52.

  As shown in FIG. 3 (B), the wall portion 54 forming the side surface of the bulging portion 42 has a straight portion 56 in which the portions joined to the belt insertion portion 48 and the cushion material 52 are formed linearly. The intermediate portion between the straight portions 56 is a folded portion 58 which is initially wavy.

  In the bulging portion 42, a hole 60 surrounded by a belt insertion portion 48, a cushion material 52 (resin plate 50), and a pair of wall portions 54 (folding portion 58) extends in the extending direction of the seat belt 22. Is formed.

  As shown in FIG. 3A, the drive unit 44 includes a first shaft 64 in which an end of the resin plate 50 on the side of the belt guide 18 is fixed to a distal end by a joint 62. In addition, a second shaft 70 is provided in which a guide member 66 composed of two resin guide plates 67 and 68 is disposed at the tip.

  The first shaft 64 and the second shaft 70 are provided to be able to advance and retreat in the vehicle front-rear direction by a driving source 72 provided in a housing 71 arranged below the seat belt 22 in the belt guide 18. The drive source 72 is not particularly limited as long as it can swell the swelling portion 42 within a predetermined time at the time of a frontal collision, such as an inflator, a motor, or a spring.

  As shown in FIG. 3A, the drive source 72 is connected to the collision ECU 74. A collision sensor 76 is electrically connected to the collision ECU 74. The collision sensor 76 outputs to the collision ECU 74 a signal corresponding to the presence or absence of a collision with the automobile and the type of collision, and the collision ECU 74 outputs a driving signal to the driving source 72 when detecting a frontal collision (inevitable). It is. In the other drawings, the illustration of the collision ECU 74 and the collision sensor 76 is omitted.

  On the other hand, one end of the guide plates 67 and 68 of the guide member 66 disposed at the distal end of the second shaft 70 is relatively rotatably connected by a joint 78. The other end of the guide plate 67 is fixed to the lower surface 48A of the belt insertion portion 48. Further, the other end of the guide plate 68 is fixed to the upper surface 50A of the resin plate 50 (the fixing position is indicated by a cross in FIGS. 3 to 5).

  Note that the guide plates 67 and 68 have bending rigidity that does not deform when the second shaft 70 advances or retreats. The resin plate 50 has a lower bending rigidity than the belt insertion portion 48.

  Further, since the guide member 66 is only provided at the tip of the second shaft 70, a wire 79 (see FIG. 5) for returning to the tip of the second shaft 70 after swelling deformation of the swelling portion 42 described later. ) Is disposed between the joint 78 and the second shaft 70. Note that the wire 79 is housed inside the second shaft 70 in an initial state.

(Action)
The operation of the thus configured vehicle occupant restraint device 10 will be described.
When the collision ECU 74 detects (inevitable) a frontal collision with the vehicle based on an input signal from the collision sensor 76 constituting the vehicle occupant restraint device 10, a drive signal is transmitted to the drive source 72 of the inflatable device 40. Is output.

  As shown in FIG. 4, the drive signal 72 causes the first shaft 64 and the second shaft 70 to move in front of the vehicle in synchronization with each other by the drive signal. Thus, the vehicle rear side of the resin plate 50 moves forward of the vehicle, but the vehicle front side fixed to the cushion member 52 does not move. As a result, the distance of the resin plate 50 in the vehicle front-rear direction is reduced, and the vehicle rear side is bent.

  At this time, the joint 78 of the guide member 66 disposed at the tip of the second shaft 70 moves forward of the vehicle. However, the end of the guide plate 68 fixed to the belt insertion portion 48 does not move. Therefore, the guide member 66 moves so that the guide plates 67 and 68 open mutually, and deforms so that the belt insertion portion 48 and the resin plate 50 are separated at the fixed position of the guide plates 67 and 68. At this time, since the belt insertion portion 48 has a higher bending rigidity than the resin plate 50, the resin plate 50 bends and deforms to the lower side of the vehicle.

  By further moving the first shaft 64 and the second shaft 70 forward of the vehicle from this state, as shown in FIG. To bend. At this time, the guide member 66 in which one end of the guide plate 68 is locked to the resin plate 50 is separated from the tip of the second shaft 70. The fold 58 of the wall 54 extends from the folded state (see FIG. 5B) with the deflecting deformation of the resin plate 50, thereby allowing the bulging portion 42 to deflect.

  As described above, in the vehicle occupant restraint device 10, the shoulder belt portion 22A extends from the belt guide 18 formed on the upper portion of the seat back 16 to the buckle 32 side along the shoulder belt portion 22A along the shoulder S of the occupant P. The swelling portion 42 provided over the vehicle is swelled below the seat belt 22 (occupant P) by the driving of the driving portion 44 (see FIG. 2C).

  Therefore, as shown in FIG. 2C, the swelling portion 42 swelling from the seat belt 22 (shoulder belt portion 22A) presses the shoulder S of the occupant P. Thereby, the relatively strong shoulder S in the human body of the occupant P can be restrained.

  On the other hand, the seat belt 22 is separated from the shoulder portion S of the occupant P by the interposed bulging portion 42 between the shoulder belt portion 22A and the occupant P. As a result, the seat belt 22 is separated from the occupant P also around the sternum B located below the shoulder S of the occupant P.

  As a result, at the time of a frontal collision, the seat belt 22 is separated from the sternum periphery B of the occupant P, so that the pressing force acting on the relatively low strength sternum periphery B in the human body of the occupant P from the seat belt 22 is reduced. The chest deflection of the occupant P can be reduced or prevented.

  In particular, the vehicle occupant restraint device 10 is provided with the belt guide 18 on the outer side in the vehicle width direction of the upper surface 16A of the seat back 16, and forms the bulging portion 42 from the belt guide 18 to the shoulder S of the occupant P. ing. Therefore, the bulging portion 42 is disposed at a fixed position with respect to the seat back 16, and the shoulder portion S can be restrained regardless of the physique of the occupant P. That is, regardless of the physique of the occupant P, it is possible to reduce or prevent the pressing force from acting near the sternum of the occupant P, and it is possible to surely reduce or prevent the occupant P's chest flexion.

  Furthermore, since the swelling device 40 has a mechanical configuration, the drive source 72 is driven to return the first shaft 64 and the second shaft 70 to the initial positions, and the wire 79 is wound around the second shaft 70. The joint 78 of the guide member 66 can be returned to the tip end position of the second shaft 70. That is, since the inflation device 40 has a mechanical configuration, it can be reused unlike an airbag.

[Second embodiment]
A vehicle occupant restraint system 80 according to a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The only difference from the first embodiment is the swelling device 82, and only that part will be described.

(Constitution)
As shown in FIG. 6, in the vehicle occupant restraint device 80, the bulging device 82 extends the seat belt 22 into the hole 60 formed between the lower surface 48A of the belt insertion portion 48 and the cushion material 52. A plurality of, for example, three linear plate members 84A to 84C are arranged at predetermined intervals along the direction.

  Specifically, one ends of the plate members 84A to 84C are fixed to the wires 86 routed on the resin plate 50 at fixed positions P1 to P3 at predetermined intervals along the extending direction of the seat belt 22. . The other ends of the plate members 84A to 84C are fixed to the lower surface 48A of the belt insertion portion 48 at fixed positions Q1 to Q3 at predetermined intervals along the extending direction of the seat belt 22. At this time, the plate members 84A to 84A are arranged such that the fixing positions P1 to P3 for the wire 86 are on the vehicle front side (the buckle 32 side in the seat belt extending direction) with respect to the fixing positions Q1 to Q3 for the belt insertion portion 48, respectively. 84C is arranged.

  Note that the wires 86 arranged on the resin plate 50 extend from a winding device 88 arranged in a housing 71 formed in the belt guide 18. The winding device 88 is electrically connected to the collision ECU 74. Therefore, when a drive signal is input from the collision ECU 74 to the winding device 88, the wire 86 is wound toward the vehicle rear side. In addition, the drive means of the winding device 88 is not particularly limited, but for example, an inflator, a spring, a motor, or the like can be considered.

(Action)
The operation of the thus configured vehicle occupant restraint device 80 will be described.

  When the collision ECU 74 detects (inevitable) a frontal collision with the vehicle based on an input signal from the collision sensor 76 constituting the vehicle occupant restraint device 80, a drive signal is sent to the winding device 88 of the bulging device 82. Is output.

  As a result, as shown in FIG. 7, the winding device 88 is driven, and the wire 86 is wound (see arrow A), so that the wire 86 moves to the belt guide 18 (vehicle rearward) side (see arrow B). . Thus, the plate members 84A to 84C, one ends of which are fixed to the wires 86 at the fixed positions P1 to P3, rotate downward (vehicle occupant P) around the fixed positions Q1 to Q3 with respect to the belt insertion portion 48 (arrow C). reference). As a result, the resin plate 50 is deformed so as to be separated from the belt insertion portion 48 toward the lower side of the vehicle. That is, the resin plate 50 is deformed so as to have a convex shape on the lower side of the vehicle.

  Accordingly, the vehicle occupant restraint device 80 can cause the bulging portion 42 to bulge below the seat belt 22 by driving the winding device 88. Thereby, the same operation and effect as those of the vehicle occupant restraint device 10 of the first embodiment can be obtained.

[Third embodiment]
A vehicle occupant restraint system 100 according to a third embodiment of the present invention will be described with reference to FIGS. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. The only difference from the first and second embodiments is the swelling device 102, and only that part will be described.

(Constitution)
As shown in FIG. 8, the bulging device 102 of the vehicle occupant restraint device 100 includes a plurality of guide members 66 of the first embodiment, for example, It is three attached.

  Specifically, a plurality of, for example, three guide members 66A to 66C are arranged at predetermined intervals along the seat belt extending direction in the hole 60 of the bulging portion 42 of the bulging device 102. ing. Specifically, joints 78A to 78C of the guide members 66A to 66C are fixed to the wire 86 at predetermined intervals along the seat belt extending direction. One end of each of the guide plates 67A to 67C of the guide members 66A to 66C is fixed to the lower surface 48A of the belt insertion portion 48 at fixed positions Q1 to Q3, and one end of the guide plates 68A to 68C is made of resin at S1 to S3. It is fixed to the upper surface 50A of the plate 50.

  In the initial state, each of the guide plates 67A to 67C and 68A to 68C is such that the joints 78A to 78C have a fixed position Q1 to Q3 for the belt insertion portion 48 and a fixed position S1 to S3 for the resin plate 50 on the front side of the vehicle (the seat belt extension). (The buckle 32 side along the existing direction).

(Action)
The operation of the thus configured vehicle occupant restraint device 100 will be described.

  When the collision ECU 74 detects (inevitable) a frontal collision with the vehicle based on an input signal from the collision sensor 76 constituting the vehicle occupant restraint device 100, a drive signal is sent to the winding device 88 of the bulging device 102. Is output.

  As a result, as shown in FIG. 9, the winding device 88 is driven to wind the wire 86 (see arrow A), so that the joints 78A to 78C fixed to the wire 86 move toward the belt guide 18 (see FIG. 9). (See arrow B). As a result, the guide plates 67A to 67C, one ends of which are fixed to the belt insertion portion 48 at the fixed positions Q1 to Q3, are rotated around the joints 78A to 78C toward the upper side of the vehicle (the direction of the arrow D), and the fixed position S1 is set. In steps S3 to S3, the guide plates 68A to 68C, one ends of which are fixed to the resin plate 50, are rotated around the joints 78A to 78C toward the vehicle lower side (occupant P) (in the direction of the arrow E).

  Here, since the belt insertion portion 48 has higher bending rigidity than the resin plate 50, the belt insertion portion 48 is deformed such that the resin plate 50 has a convex shape toward the lower side of the vehicle.

  That is, the vehicle occupant restraint device 100 can cause the bulging portion 42 to bulge toward the vehicle lower side (occupant P) below the seat belt 22 by driving the winding device 88. Thereby, the same operation and effect as those of the vehicle occupant restraint device 10 of the first embodiment can be obtained.

[Fourth embodiment]
A vehicle occupant restraint system 120 according to a fourth embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The only difference from the first embodiment is the swelling device 122, so only that part will be described.

(Constitution)
As shown in FIG. 10, the swelling device 122 forms a coiled wiring pattern 124 on the lower surface 48A of the belt insertion portion 48 and forms a coiled wiring pattern 126 on the upper surface 50A of the resin plate 50. Things. The wiring patterns 124 and 126 are connected to a current supply device 132 provided inside the housing 71 via resistors 128 and 130. Further, a collision ECU 74 is connected to the power supply device 132. 10 and 11, the wiring patterns 124 and 126 are shown separated from the lower surface 48A of the belt insertion portion 48 and the upper surface 50A of the resin plate 50 for convenience of description.

  The wiring patterns 124 and 126 are configured to generate a magnetic field having the opposite polarity when energized by the energizing device 132.

(Action)
When the collision ECU 74 detects (inevitable) a frontal collision with the vehicle based on an input signal from the collision sensor 76 constituting the vehicle occupant restraint device 120, a drive signal is transmitted to the energizing device 132 of the bulging device 122. Is output.

  As a result, as shown in FIG. 11, a current flows from the power supply device 132 to the coil-shaped wiring patterns 124 and 126, respectively. As a result, the wiring patterns 124 and 126 have polarities opposite to each other. For example, in the wiring pattern 124, the lower side of the vehicle has S polarity, and in the wiring pattern 126, the upper side of the vehicle has S polarity. As a result, a magnetic force acts on the belt insertion portion 48 on which the wiring pattern 124 is formed and the resin plate 50 on which the wiring pattern 126 is formed, in a direction to separate them from each other. Here, since the bending rigidity of the resin plate 50 is lower than the bending rigidity of the belt insertion portion 48, the resin plate 50 is deformed so as to have a downwardly convex shape.

  That is, the vehicle occupant restraining device 100 can be swelled to the vehicle lower side (occupant P) side of the seat belt 22 by energization of the energizing device 132. Thereby, the same operation and effect as those of the vehicle occupant restraint device 10 of the first embodiment can be obtained.

[Others]
In the first to fourth embodiments, the vehicle seat 12 on the right side (driver's seat side) of the front seat of the vehicle has been described. , 80, 100 can be similarly applied.

In addition, the swelling device according to the first to fourth embodiments is driven by a mechanical configuration of a shaft or a wire or an electromagnetic force. However, the swelling device is based on a so-called airbag, that is, an inflator corresponding to the hole 60. A configuration in which the portion to be expanded may be expanded.
Further, in the first to fourth embodiments, the configuration in which the shoulder anchor is provided in the pillar has been described. However, the present invention is also applicable to a so-called belt-in seat in which the shoulder anchor and the retractor are provided in the seat back.

10, 80, 100, 120 Vehicle occupant restraint device 12 Vehicle seat 16 Seat back 16A Upper end surface (upper surface)
18 Belt guide 20 Seat belt device (3-point seat belt)
22 seat belt 22A shoulder belt 28 shoulder anchor 32 buckles 40, 82, 102, 122 swelling device (swelling means)
P occupant S occupant shoulder

Claims (1)

A three-point seat belt including a shoulder belt extending from a shoulder anchor located above and outside a vehicle width direction of a seat back constituting a vehicle seat on which an occupant sits, toward a buckle at a vehicle width direction inner lower part;
A belt guide provided on the upper surface of the seat back in the vehicle width direction and through which the shoulder belt is inserted;
The shoulder belt is inserted, and one end is fixed to the belt guide, and is provided along the shoulder belt from the belt guide to the buckle side along the shoulder of the occupant. Bulging means bulging to the side,
Equipped with a,
The swelling means is provided along the shoulder belt, a belt insertion portion through which the shoulder belt is inserted,
A resin plate that is provided on the occupant side in parallel with the belt insertion portion and separated from the belt insertion portion by a predetermined distance and has a lower rigidity than the belt insertion portion,
Guide members each having an end fixed to the belt insertion portion and the resin plate,
A drive unit that displaces the guide member during a frontal collision to separate the belt insertion unit and the resin plate,
A vehicle occupant restraint device having a vehicle.