JP2019055733A - Vehicle seat belt device - Google Patents

Abstract

[PROBLEMS] To suppress a lowering of the supporting force of a passenger's waist by a lap belt from the early stage to the late stage of a collision. A vehicular seat belt device (10) spans in the seat width direction of a vehicular seat (12) and supports a lap belt (P1) of an occupant (P1) seated on the vehicular seat (12), and an end of the lap belt (32A). A belt anchor 34 connected to the vehicle body and fixed to the vehicle body. Further, the vehicle seat belt device 10 is disposed on the belt anchor 34 side on the one side in the seat width direction, and the lap belt 32A is inserted, and the occupant P moves to the front side of the seat due to the collision of the vehicle. A belt guide 36 that moves to the front side and the lower side of the seat is provided. [Selection] Figure 1

Description

  The present invention relates to a vehicle seat belt device.

  Patent Document 1 below discloses a vehicle seat structure that suppresses the lap belt from pressing the occupant's abdomen in the late stage of a vehicle collision. In the configuration described in this document, the lap belt occupant in the later stage of the collision is made variable by changing the extension path of the lap belt so that the abdomen side belt angle in the late stage of the vehicle is larger than the abdomen side belt angle in the early stage of the collision. Suppresses pressure on the abdomen.

JP, 2006-124325, A

  However, as the occupant moves forward in the event of a vehicle collision, if the relationship between the lap belt and the occupant in the early stage of the collision and the relationship between the lap belt and the occupant in the later stage of the collision change significantly, Is considered to be reduced.

  In view of the above-described facts, an object of the present invention is to provide a vehicle seat belt device capable of suppressing a decrease in the supporting force of the lap belt of the occupant from the initial stage of the collision to the late stage of the collision.

  According to a first aspect of the present invention, there is provided a vehicular seat belt device that is stretched over in the seat width direction of the vehicular seat, and supports a lap belt that supports a waist portion of an occupant seated on the vehicular seat, and an end portion of the lap belt. A belt fixing part fixed to the vehicle seat or the vehicle body, and the lap belt is inserted while being disposed on the belt fixing part side on one side in the seat width direction, and the occupant is located on the front side of the seat when the vehicle collides And a belt guide that moves to the front side and the lower side of the seat.

  According to the vehicle seat belt device of the first aspect, the waist of the occupant seated on the vehicle seat is supported by the lap belt. The end portion of the lap belt is fixed to the vehicle seat or the vehicle body via a belt fixing portion. A belt guide is inserted through the lap belt. The belt guide is disposed on the belt fixing portion side on one side in the sheet width direction. As the vehicle collides, the occupant moves to the front side of the seat, so that the belt guide moves to the front side and the lower side of the seat. Thereby, the change in the inclination angle of the lap belt with respect to the seat vertical direction in the side view of the seat is reduced from the initial stage of the collision to the late stage of the collision.

  The vehicle seat belt device according to the present invention has an excellent effect that it is possible to suppress a decrease in the supporting force of the lap belt of the occupant from the initial stage of the collision to the late stage of the collision.

It is a side view showing a vehicle seat belt device of this embodiment. It is a side view which shows the belt guide by which the lap belt was penetrated partially in a cross section. It is a disassembled side view which decomposes | disassembles and shows a belt guide. It is a graph which shows the support force of the passenger | crew's waist | hip | lumbar part by the lap belt with respect to the waist | lumbar part displacement amount at the time of the collision of a vehicle. It is a side view which shows the seat cushion frame etc. to which the guide plate in the modification of this embodiment was attached. FIG. 7 is an enlarged sectional view showing another guide plate, a seat cushion frame, and the like cut along line 6-6 shown in FIG. It is a perspective view which shows the guide plate provided with the 1st energy absorption mechanism. It is a perspective view which shows the guide plate provided with the 2nd energy absorption mechanism. It is a perspective view which shows the guide plate provided with the 3rd energy absorption mechanism. It is the schematic diagram which showed the 4th energy absorption mechanism typically. It is the schematic diagram which showed the 5th energy absorption mechanism typically.

  A vehicle seat belt device according to an embodiment of the present invention will be described with reference to FIGS. In the following description, the front / rear / left / right / up / down directions will be described, and the front / rear / left / right / up / down directions viewed from the occupant seated on the vehicle seat will be indicated. The arrow UP indicates the upward direction, the arrow RH indicates the right direction, and the arrow LH indicates the left direction. Further, the arrow RH and the arrow LH coincide with the sheet width direction.

  As shown in FIG. 1, the vehicle seat belt device 10 of the present embodiment is for supporting (restraining) the body of an occupant P seated on the vehicle seat 12. First, the schematic configuration of the vehicle seat 12 will be described, and then the configuration of the vehicle seat belt device 10 will be described.

  The vehicle seat 12 includes a seat cushion 14 that supports the buttocks and thighs of the occupant P, and a seat back 16 that supports the upper body of the occupant P. The seat cushion 14 is configured by attaching a seat cushion pad (not shown) covered with a skin material to the seat cushion frame 18. The seat cushion frame 18 includes a pair of left and right side frames (lower arms) 20 that extend in the front-rear direction and are spaced from each other in the left-right direction. The front end side and the rear end side of the lower arm are connected in the left-right direction via a rod 22. The front and rear rods 22 are connected to the upper rail 28 of the seat rail 26 via the lifter mechanism 24. And by operating the lifter mechanism 24, the seat cushion 14 and the seat back 16 can be moved in the vertical direction. Further, the upper rail 28 constituting a part of the seat rail 26 is slid along the lower rail 30 constituting the other part of the seat rail 26, thereby moving the seat cushion 14 and the seat back 16 in the front-rear direction. It is possible to make it.

  The vehicle seat belt device 10 is a three-point seat belt device having a shoulder belt and a lap belt 32A that support the upper body of the occupant P and the waist P1. This vehicle seat belt device 10 includes a belt 32 wound around a retractor (not shown), and a belt anchor 34 as a belt fixing portion that is engaged with an end of the belt 32 opposite to the side wound around the retractor. It is equipped with. Further, in the vehicle seat belt device 10, the belt 32 is inserted into the tongue 32 (not shown) in which the belt 32 is attached to the body of the passenger P by being engaged with a buckle (not shown) through which the belt 32 is inserted. Thus, a belt guide 36 that guides a part of the belt 32 is provided. Further, the vehicle seat belt device 10 includes a guide plate 38 that supports the belt guide 36.

  The belt 32 is formed in a long band shape. In the belt 32 in a state where the tongue (not shown) is engaged with the buckle, a portion of the belt P that is slanted in the left-right direction on the upper body of the occupant P is a shoulder belt (not shown). The part to be bridged is the lap belt 32A.

  In the belt anchor 34, the end portion of the belt 32 (lap belt 32A) is locked by pin joining. In the present embodiment, the belt anchor 34 is fixed to the floor of the vehicle body on the side opposite to the side where the buckle is provided on the side of the seat cushion 14 (left side in the case of a driver seat of a left-hand drive vehicle). Yes. The belt anchor 34 may be fixed to the lower portion of the seat cushion frame 18 positioned below the belt guide 36.

  As shown in FIGS. 1 and 2, the belt guide 36 is disposed on the side of the seat opposite to the side where the buckle is provided (left side) by being supported by a guide plate 38 to be described later. . As shown in FIGS. 2 and 3, the belt guide 36 includes a belt guide main body portion 36B having a belt insertion hole 36A through which the belt 32 is inserted, and extends from the belt guide main body portion 36B. A screw portion 36C formed with a screw and a nut 36D screwed into the screw portion 36C are provided.

  As shown in FIG. 1, the guide plate 38 is formed in a rectangular shape as viewed from the side of the sheet. As shown in FIGS. 1 and 2, the guide plate 38 is formed with an elongated guide hole 38 </ b> A through which the screw portion 36 </ b> C of the belt guide 36 is inserted. In the present embodiment, the longitudinal direction of the guide plate 38 coincides with the longitudinal direction of the guide hole 38A. The guide plate 38 is fixed to the left side frame 20 by fastening or the like. Further, in a state where the guide plate 38 is fixed to the left side frame 20, the guide hole 38A is inclined downward as it goes to the front side in the seat side view. Then, with the threaded portion 36C of the belt guide 36 inserted through the guide hole 38A and disposed at the rear end portion of the guide hole 38A, the nut 36D is screwed, so that the belt guide 36 is engaged with the guide plate 38. It is supported. In this state, the belt guide 36 is disposed rearward of the belt anchor 34. Therefore, a portion of the lap belt 32A between the belt guide 36 and the belt anchor 34 is inclined downward as it goes forward.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 1, in the present embodiment described above, the occupant P seated on the vehicle seat 12 engages the tongue with the buckle, so that the belt 32 is attached to the body of the occupant P. That is, the upper body of the occupant P is supported by the shoulder belt, and the waist P1 of the occupant P is supported by the lap belt 32A.

  Further, when the vehicle equipped with the vehicle seat belt device 10 of the present embodiment collides with the front and the vehicle suddenly decelerates, the upper body of the occupant P is restrained by the shoulder belt, and the waist P1 of the occupant P is wrapped. The occupant P moves forward with respect to the vehicle seat 12 while being restrained by the belt 32A.

  As the occupant P moves forward, tension is generated in the lap belt 32 </ b> A, and the belt guide 36 moves forward along the guide plate 38. However, the change in the inclination angle θ of the lap belt 32A with respect to the seat vertical direction in a side view of the seat is smaller than that of a vehicle seat that does not include the configuration of the present embodiment. As a result, it is possible to suppress a decrease in the supporting force of the lap belt 32A of the occupant P by the lap belt 32A from the initial stage of the collision to the late stage of the collision. In the present embodiment, since the change in the positional relationship between the lap belt 32A and the pelvis P2 is small from the initial stage of the collision to the late stage of the collision, the front side of the center of gravity of the pelvis P2 can always be supported. As a result, it is possible to obtain an action of raising the pelvis P2 when the occupant P is moved forward (moment M for rotating the pelvis P2 forward). As a result, it is possible to effectively reduce the amount of forward movement of the waist P1 of the occupant P when the vehicle collides.

  Here, FIG. 4 is a graph showing the support force of the lumbar P1 of the occupant P by the lap belt 32A with respect to the lumbar displacement amount (amount of movement of the occupant P to the front side of the lumbar P1 (pelvis P2)) during a vehicle collision. It is shown. As shown in this figure, when a mechanism for moving the belt guide 36 forward and downward is provided, B1 (solid line), compared to B2 (dashed line) when the mechanism is not provided, lap belt 32A. It can be seen that the support force of the waist P1 of the occupant P is improved by C1, and the forward movement amount is reduced by C2.

  Further, in the present embodiment, the belt guide 36 in a state before the collision is disposed on the rear side of the belt anchor 34, so that the occupant P can use the power of the occupant P without using a power source such as a motor. The belt guide 36 can be moved forward and downward using forward movement.

  Further, in the present embodiment, a guide plate 38 that supports the belt guide 36 is fixed to the side frame 20. Thereby, it can suppress that the support force of the passenger | crew's P waist | hip | lumbar part P1 by the lap belt 32A falls irrespective of the up-down position and front-back position of the seat cushion 14.

  In this embodiment, the example in which the guide plate 38 that supports the belt guide 36 is fixed to the side frame 20 has been described, but the guide plate 38 may be fixed by other methods. For example, as shown in FIGS. 5 and 6, even if the guide plate 38 is fixed to the front and rear rods 22 with the front and rear rods 22 inserted through the front end portion and the rear end portion of the guide plate 38, respectively. Good.

(About energy absorption mechanism)
By the way, if the kinetic energy of the occupant P at the time of the collision of the vehicle can be absorbed, the amount of movement of the occupant P toward the front side of the waist P1 can be further reduced. Hereinafter, an energy absorbing mechanism for absorbing the kinetic energy of the occupant P at the time of a vehicle collision will be described.

  FIG. 7 shows a guide plate 38 to which the first energy absorbing mechanism is applied. In the guide plate 38, the inner diameter D1 of the guide hole 38A at the rear end portion 38AR of the guide hole 38A is set to be larger than the outer diameter D3 (see FIG. 3) of the threaded portion 36C of the belt guide 36. Further, the inner diameter D2 of the guide hole 38A (the width dimension D2 in the short direction of the guide hole 38A) in the portion 38AF on the front side of the rear end portion 38AR of the guide hole 38A is the outer diameter D3 of the screw portion 36C (FIG. 3). It is set to an inner diameter smaller than that of the reference. Therefore, when the belt guide 36 moves along the guide hole 38A of the guide plate 38 at the time of a vehicle collision, the inner edge of the screw portion 36C of the belt guide 36 and the inner edge of the portion 38AF on the front side of the rear end portion 38AR of the guide hole 38A. Slides. Thereby, the kinetic energy of the occupant P at the time of the collision of the vehicle can be absorbed by plastic deformation between the screw portion 36C of the belt guide 36 and the inner edge of the portion 38AF on the front side of the rear end portion 38AR of the guide hole 38A.

  FIG. 8 shows a guide plate 38 to which the second energy absorbing mechanism is applied. In the guide plate 38, the inner diameter D1 of the guide hole 38A at the rear end portion 38AR of the guide hole 38A is set to be larger than the outer diameter D3 (see FIG. 3) of the threaded portion 36C of the belt guide 36. In addition, the inner diameter D2 of the guide hole 38A (the width dimension D2 in the short direction of the guide hole 38A) in the portion 38AF on the front side of the rear end portion 38AR of the guide hole 38A becomes gradually smaller toward the front side. ing. Therefore, when the belt guide 36 moves along the guide hole 38A of the guide plate 38 at the time of a vehicle collision, the inner edge of the screw portion 36C of the belt guide 36 and the inner edge of the portion 38AF on the front side of the rear end portion 38AR of the guide hole 38A. , And the resistance due to the plastic deformation increases as it goes forward. Thereby, the kinetic energy of the occupant P at the time of the collision of the vehicle can be absorbed by plastic deformation between the screw portion 36C of the belt guide 36 and the inner edge of the portion 38AF on the front side of the rear end portion 38AR of the guide hole 38A.

  FIG. 9 shows a guide plate 38 to which the third energy absorbing mechanism is applied. In the guide plate 38, the energy absorbing member 40 is filled in the guide hole 38A. Therefore, when the belt guide 36 moves along the guide hole 38A of the guide plate 38 at the time of a vehicle collision, the thread portion 36C of the belt guide 36 deforms (breaks) the energy absorbing member 40. Thereby, the kinetic energy of the passenger | crew P at the time of a vehicle collision can be absorbed by the deformation | transformation of the energy absorption member 40. FIG. Various members can be used as the energy absorbing member 40 regardless of the material. As an example, the energy absorbing member 40 having the same configuration as a crash box provided between the bumper reinforcement of the vehicle and the front side member may be provided inside the guide hole 38A.

  FIG. 10 shows a torsion bar 42 constituting the fourth energy absorbing mechanism. An end 44 </ b> A on one side of the wire 44 is wound around the torsion bar 42, and an end 44 </ b> B on the other side of the wire 44 is locked to a screw part 36 </ b> C of the belt guide 36. Therefore, when the belt guide 36 moves along the guide hole 38A of the guide plate 38 at the time of a vehicle collision, the wire 44 locked to the screw portion 36C of the belt guide 36 is pulled, and the torsion bar 42 is twisted and deformed. The Thereby, the kinetic energy of the occupant P at the time of a vehicle collision can be absorbed by the torsional deformation of the torsion bar 42.

  FIG. 11 shows a spring 46 constituting a fifth energy absorbing mechanism. One end 46 </ b> A of the spring 46 is locked to the seat cushion frame 18, and the other end 46 </ b> B of the spring 46 is locked to the screw portion 36 </ b> C of the belt guide 36. Therefore, when the belt guide 36 moves along the guide hole 38A of the guide plate 38 at the time of the collision of the vehicle, the spring 46 is deformed by being pulled. Thereby, the kinetic energy of the passenger P at the time of the collision of the vehicle can be absorbed by the deformation of the spring 46.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 Vehicle seat belt apparatus 12 Vehicle seat 32A Lap belt 34 Belt anchor (belt fixing part)
36 Belt Guide P Crew P1 Waist

Claims (1)

A lap belt that is stretched over in the seat width direction of the vehicle seat and supports a waist of an occupant seated on the vehicle seat;
An end portion of the lap belt is connected, and a belt fixing portion fixed to a vehicle seat or a vehicle body;
It is arranged on the belt fixing part side on one side in the seat width direction and the lap belt is inserted, and the occupant moves to the front side of the seat and moves to the front side of the seat and the lower side of the seat by the collision of the vehicle. A belt guide to
A vehicle seat belt apparatus comprising: