JP6601461B2 - Vehicle occupant restraint system - Google Patents

Description

  The present invention relates to an occupant restraint device for a vehicle.

  In vehicles, it is common to equip each seat with a seat belt device to protect passengers in the event of a collision. A so-called three-point system is generally used for a seat belt device for a vehicle, and a seat belt that passes through a belt guide disposed in the vicinity of one of the left and right shoulders of an occupant is inclined from one shoulder of the occupant. It extends downward and restrains the occupant. In order to reduce seat belt slack in the event of a vehicle collision, the retractor that winds up the seat belt is generally a pretensioner type, and the tightening force by the seat belt exceeds a predetermined value. In order to prevent this, a load limiter is also commonly used.

  Patent Document 1 discloses a technique that suppresses chest deflection (deformation of ribs) due to a seat belt by displacing a seat belt anchor or a belt guide toward an occupant side during a frontal collision. In the thing of patent document 2, regarding the belt guide, using a spring that urges the belt guide toward the occupant side and a stopper mechanism that uses a piston and cylinder that normally restricts movement toward the occupant side, A device that releases the stopper mechanism and moves the belt guide to the occupant side during a frontal collision is disclosed (paragraph numbers 0034 and 0035). Patent Document 2 discloses, as another example, urging the belt guide toward the occupant using the explosive force of the inflator (paragraph number 0040).

  Patent Document 2 discloses a belt guide whose position in the vehicle width direction can be adjusted by a manual operation in accordance with the passenger's preference.

Japanese Patent Laid-Open No. 2006-88335 JP 2010-23750 A

  By the way, recently, there are some which use a booster seat that is placed and fixed on a seat cushion for children of about 6 and 12 years old. The child seated in this booster seat has almost the same height as the shoulder of an adult seated directly on the seat cushion, so the seat belt device can be used for both adults and children. .

  As described above, when the seat belt is used for both an adult and a child seated on a booster seat, the child's shoulder width is smaller than the shoulder width of the adult, so the seat belt is easily detached from the child's shoulder. At the time of a forward collision, in particular, at the time of an oblique collision in which the child is about to be thrown out on the side opposite to the belt guide, the seat belt is easily detached from the child's shoulder.

  For this reason, it is also conceivable that the belt guide is installed in advance on the occupant side (side closer to the occupant's neck) than usual, assuming that the child wears a seat belt. However, in this case, when an adult wears a seat belt, the seat belt is located near the neck, and the feeling of wearing becomes extremely bad.

  From the above, as described in Patent Document 1, it is conceivable to move the belt guide to the occupant side during a frontal collision. However, it is not preferable to use a spring and a stopper mechanism composed of a piston / cylinder or an inflator for moving the belt guide because it uses expensive parts.

  Further, as described in Patent Document 2, it is conceivable to manually adjust the position of the belt guide in the vehicle width direction. However, it is troublesome to adjust the position of the belt guide by manual operation, and it is easy to forget to make this adjustment.

  The present invention has been made in consideration of the above circumstances, and its purpose is to prevent the deterioration of the wearing feeling when an adult is wearing, without adding expensive parts or manual operation separately, and It is an object of the present invention to provide an occupant restraint device for a vehicle that can prevent shoulder detachment of a seat belt at the time of a collision when it is worn.

In order to achieve the above object, the following basic solution is adopted in the present invention. That is, as described in claims 1 to 4 ,
A pretensioner type retractor is disposed behind the belt guide disposed in the vicinity of one of the left and right shoulders of the occupant, and the seat belt passing through the belt guide extends obliquely downward from the shoulder of the occupant. A vehicle occupant restraint device adapted to restrain the occupant
The belt guide has an inner side wall portion extending upward at an end portion on the passenger side,
The inner side wall portion normally restricts the seat belt from being displaced more than a predetermined amount toward the occupant side,
The inner side wall portion is elastically deformed toward the occupant side by receiving a component force toward the occupant side of the tensile force when a tension force of the pretension by the retractor acts on the seat belt, The seat belt is a position displaced toward the occupant side than normal,
It is like that.
In addition to the above basic solution method, the present invention further adopts the following specific solution method. That is,
In the invention described in claim 1, among the materials constituting the belt guide, the material constituting the inner side wall portion is different from the material constituting the other portion to constitute the inner side wall portion. The material is relatively easy to elastically deform as compared with the material constituting the other part.
In the invention described in claim 2, when the inner side wall portion is elastically deformed, at least a part of the seat belt can be displaced toward the occupant side over the inner side wall portion. And so on.
In the invention described in claim 3,
The belt guide has an outer side wall portion extending upward at an end opposite to the passenger side,
The height of the inner side wall is higher than the height of the outer side wall,
It is like that.
In the invention described in claim 4,
The belt guide has an outer side wall portion extending upward at an end opposite to the passenger side,
The outer side wall portion has a bent portion whose upper end portion is directed toward the occupant side,
The directional extension line of the bent portion is set to pass through a position lower than the upper end of the inner side wall portion,
It is like that.
Preferred embodiments of the present invention are as set forth in claims 5 and below.

According to the above solution, the seat belt can be placed in a position that is not too close to the neck of an adult occupant in a normal state, so that the feeling of wearing the seat belt can be improved. Further, since the seat belt is moved to the occupant side at the time of a frontal collision, it is possible to prevent a situation in which the seat belt comes off the shoulder when the occupant is a child. Further, the movement of the belt guide toward the occupant side is performed by elastically deforming the inner side wall portion of the belt guide by effectively utilizing the tensile force due to the pretension, and thus the structure becomes very simple. Furthermore, since it is not necessary to adjust the position of the belt guide in the vehicle width direction by manual operation, the handling is easy, and the situation of forgetting to adjust the position does not occur. In addition to the above, since the tensile force due to the pretension can be expected as a predetermined constant value, it is preferable for reliably obtaining the operation of elastically deforming the inner side wall portion toward the occupant side and moving the seat belt toward the occupant side. Become.
In addition to the above, in the first aspect of the invention, it is possible to easily and surely perform elastic deformation of the inner side wall portion based on the tensile force of the pretension, by a simple method of partially different materials. it can.
In invention of Claim 2, it becomes a thing preferable when ensuring the movement to the passenger | crew side of a seatbelt largely.
In the invention according to claim 3, the height of the inner side wall portion is sufficiently secured to prevent a situation in which the seat belt gets over the inner side wall portion at the normal time, and the tension of the pretension is applied at the time of a forward collision. This is preferable for reliably transmitting the force to the inner side wall portion and elastically deforming the inner side wall portion toward the occupant.
In the invention according to claim 4, the seat belt is secured at a normal time while ensuring a sufficient height of the inner side wall portion to prevent a situation in which the seat belt normally gets over the inner side wall portion. This is also preferable in preventing a situation where the outer side wall portion is overcome.

In the invention of claim 5, the weakened portion to facilitate the elastic deformation of the inner side wall portion is formed in the vicinity of the inner side wall portion or inner side wall section, since way are, tensile flop retention The elastic deformation of the inner side wall portion based on the force can be easily and reliably performed.

In the invention of claim 6, at least the proximal end of the inner side wall portion is inclined toward the gradually occupant side toward upwardly, so way are, before side collision This is preferable for promoting the movement of the seat belt toward the passenger.

  According to the present invention, it is possible to prevent deterioration of the feeling of wearing when an adult is worn without adding expensive parts or performing manual operation separately, and to prevent the shoulder of the seat belt from falling off at the time of collision when a child is worn. Both can be satisfied.

The front view which shows the state which restrained the adult with the seatbelt. The front view which shows the state which restrained the child seated on the booster seat with the seatbelt. The top view which shows the relationship between a belt guide, a retractor, and a seatbelt. The partial cross section front view when the relationship between a belt guide, a retractor, and a seatbelt is seen from the front. The perspective view of a belt guide. The top view of a belt guide. The left view of FIG. The front view of FIG. The right view of FIG. The figure which shows the positional relationship of the belt guide and seatbelt in normal time. The figure which shows the positional relationship of the belt guide and seatbelt at the time of receiving the tensile force by a pretension. The front view which shows the 1st example which formed the weakened part in the belt guide. The front view which shows the 2nd example which formed the weakening part in the belt guide. Front sectional drawing which shows the 3rd example which formed the weakened part in the belt guide. The front view which shows the 4th example which formed the weakened part in the belt guide.

  In FIG. 1, a rear seat S includes a seat cushion 1, a seat back 2, and a headrest 3. In FIG. 1, a right end portion of the seat S is shown, and an adult P <b> 1 is seated on the seat cushion 1.

  A belt guide 10 is fixed to the upper right end portion of the seat back 2. A retractor 30 is fixedly disposed behind the belt guide 10. The seat belt 40 pulled out from the belt outlet 30a of the retractor 30 extends almost straight forward, and then extends diagonally downward from the shoulder (right shoulder) of the adult P1 via the belt guide 10. It is established and restrains adult P1. The front end of the seat belt 40 is fixed to the vehicle body near the lower right of the adult P1, and a tongue (not shown) provided in the middle of the seat belt 40 is detachable from the locking device near the left waist of the adult P1. Is engaged. Thus, the seat belt device is a three-point system.

  The retractor 30 is a pretensioner type, and at the time of a vehicle collision, that is, at the time of a frontal collision or an oblique collision in which the vicinity of the left and right ends of the front part of the vehicle body collide, The adult P1 is reliably restrained by the seat belt 40. Further, the retractor 30 is of a load limiter type, and the seat belt 40 does not restrain the adult P1 with a tightening force of a predetermined value or more.

  In FIG. 2, a booster seat 5 is disposed on the seat cushion 1, and a child P <b> 2 (assuming a child of about 6 or 12 years old) is seated on the booster seat 5. The child P2 is also restrained by the seat belt 40.

  As is clear from comparison between FIGS. 1 and 2, the height of the shoulders of the adult P1 and the child P2 on the booster seat 5 are substantially the same. On the other hand, the shoulder width is greatly different between the adult P1 and the child P2. Therefore, the seatbelt 40 at the time of restraint is preferably positioned between the neck and the right shoulder in the adult P1 at the height position near the shoulder, and is positioned near the right shoulder in the child P2. become.

  In FIG. 1 and FIG. 2, the position of the belt guide 40 in the vehicle width direction is a preferable position setting for the adult P1. However, in the child P2, since the seat belt 40 is located near the right shoulder, the seat belt 40 is detached from the right shoulder, and the restraint by the seat belt 40 is easily released. In particular, at the time of an oblique collision in which the left front portion of the vehicle collides, as shown by the arrow α in FIG. 2, the child P2 tends to be thrown not only forward but also in the direction toward the left side. It becomes easy to come off from the right shoulder of P2. Such a phenomenon also occurs when the belt guide 40 is disposed near the left shoulder of the occupant (at the time of an oblique collision in which the end on the opposite side of the belt guide from the front of the vehicle body collides with the occupant) The belt is likely to slip off.

  In order to prevent the seat belt 40 from coming off the shoulder of the child P2, the belt guide 10 is moved closer to the passenger side than the position shown in FIGS. 1 and 2 (moved to the right side in FIGS. 1 and 2). It is also possible to consider that it is a position. However, in this case, in the adult P1, the seat belt 40 is close to the neck in a normal state, and the feeling of wearing is poor.

  In the present invention, the deformation of the belt guide 10 is used to improve (not deteriorate) the wearing feeling at the normal time for the adult P1, while the shoulder of the seat belt 40 at the time of the collision can be prevented for the child P2. It is like that.

  Hereinafter, the details of the belt guide 10 will be described with reference to FIGS. 5 and 9, but the belt guide 10 is an integrally molded product made of synthetic resin as a whole. The belt guide 10 includes a plate-like fixing portion 11 that is fixed to the upper end of the seat back 2 (the frame) by the fixing tool 20, and a lower guide portion 12 that is formed so as to be continuous with the front end portion of the fixing portion 11. The outer side wall part 13 and the inner side wall part 14 are provided.

  The lower guide portion 12 has a smooth surface so that the seat belt 40 does not slide well (a slippery member can be applied and coated), and has a width sufficiently larger than the width of the seat belt 40. The height position of the lower guide portion 12 (the upper surface thereof) is set to be substantially the same as the height position of the belt outlet 30a of the retractor 30 as shown in FIG.

  The outer side wall portion 13 extends upward from the end of the lower guide portion 12 on the outer side in the vehicle width direction (the side opposite to the side on which the adult P1 or child P2 as the occupant is located). The inner side wall portion 14 extends upward from the occupant-side end portion of the lower guide portion 12.

  The side wall portions 13 and 14 restrict the seat belt 40 from being detached from the belt guide 10 (the lower guide portion 12) in the vehicle width direction in a normal state. In the embodiment, the outer side wall portion 13 has a bent portion 13a that extends shortly upward at one end and then extends obliquely upward toward the occupant side.

  The inner side wall part 14 is inclined so as to approach the passenger side as it goes upward. More specifically, the inner surface 14a of the inner side wall portion 14 is inclined so as to approach the passenger side as it goes upward. Due to this inclination, a portion of the seat belt 40 on the lower guide portion 12 is easily moved toward the occupant side. However, in a normal state, the height of the inner side wall portion 14 is prevented so that the seat belt 40 does not get over the inner side wall portion 14 even if the seat belt 40 is subjected to a force toward the occupant side by a pulling operation or the like by the occupant. Is set.

  Here, the height of the inner side wall part 14 is set higher than the height of the outer side wall part 13. In addition, an extension line in a direction in which the bent portion 13 a of the outer side wall portion 13 is directed passes through a position lower than the upper end of the inner side wall portion 14.

  The inner side wall portion 14 is set so as to be easily elastically deformed toward the occupant side when receiving a rearward pulling force due to the pretension from the retractor 30. In the embodiment, the material of the portion constituting the inner side wall portion 14 (the portion extending upward from the lower guide portion 12) is different from the material constituting the other portion, and a material that is more easily elastically deformed is used. (For example, the inner side wall portion 14 and other portions are formed by two-color molding integrally).

  The seat belt 40 that restrains the occupant is normally positioned on the lower guide portion 12 as shown in FIG. 10 (in a state where the tensile force due to pre-tension is not acting), and the inner side wall portion 14. It is located on the bottom side. As a result, for the adult P1 as an occupant, the seat belt 40 is separated from the neck as shown in FIG. 1 and the wearing feeling is deteriorated by wearing the seat belt 40. Not supposed to be.

  When the vehicle collides, the pretensioner is activated, and a large tensile force in the direction of being retracted into the retractor 30 acts on the seat belt 40. This tensile force generates a component force toward the occupant side on the belt guide 10 with respect to the seat belt 40. Since this component force becomes a considerably large force, the seat belt 40 is moved toward the occupant side while elastically deforming the inner side wall portion 14 toward the occupant side as shown in FIG. The movement of the seat belt 40 on the occupant side prevents the seat belt 40 from being detached from the shoulder particularly when the occupant is a child P2. Note that the movement of the seat belt 40 on the occupant side accompanying the tensile force may be performed within a range that does not get over the inner side wall part 14, or may be a large one that gets over the inner side wall part 14.

  12 and 15 each show a modification of the belt guide 10 and show an example for promoting the elastic deformation of the inner side wall portion toward the occupant side. The belt guide 10B shown in FIG. 12 has a notch 15 as a weakened portion formed on the surface on the occupant side of the bottom (base) of the inner side wall portion 14. Due to the formation of the notch 15, the inner side wall portion 14 is more easily elastically deformed toward the occupant side when receiving an external force (the aforementioned component force) from the seat belt 40 toward the occupant side of the same size. The

  The belt guide 10 </ b> C shown in FIG. 13 has a notch 16 as a weakened portion formed on the front surface of the bottom (base) of the inner side wall portion 14.

  The belt guide 10 </ b> D shown in FIG. 14 is formed with a slit 17 as a weakened portion extending into the base portion of the inner side wall portion 14.

  The belt guide 10E shown in FIG. 15 has an inner side wall portion 14B (corresponding to 14) whose shape is folded back to the opposite side to the occupant in the upper part of the belt guide 10E as compared with the embodiment shown in FIGS. A folded portion 14Ba having a spiral shape is formed. Further, the outer side wall portion 13B (corresponding to 13) has a bent portion 13Ba obtained by further extending the bent portion in the embodiment shown in FIGS. 5 and 9, and the distal end portion 13Bb of the bent portion 13Ba is connected to the inner side wall portion. 14B is inclined downward so as to be opposed to the folded portion 14Ba. And the recessed part 18 as the weakening part extended elongate along the inner side wall part 14B is formed in the front surface of the inner side wall part 14B. In this embodiment, it can prevent more reliably that the seatbelt 40 remove | deviates from the belt guide 10E. In addition, when receiving a pretension tensile force, a component force that elastically deforms the inner side wall portion 14B toward the occupant is applied to a higher position of the inner side wall portion 14B. The seat belt 40 can be easily moved to the occupant side by sufficiently elastically deforming the upper end portion) toward the occupant side.

  Although the embodiments have been described above, the present invention is not limited to the embodiments, and appropriate modifications can be made within the scope of the claims. It can also be used for front seats (especially 2-theta vehicles). Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention is suitable as a seat belt for a vehicle.

P1: Adult (occupant)
P2: Child (crew)
S: Seat 1: Seat cushion 2: Seat back 5: Booster seat 10: Belt guide 10B: Belt guide (FIG. 12)
10C: Belt guide (FIG. 13)
10D: belt guide (FIG. 14)
10E: belt guide (FIG. 15)
11: Fixed part 12: Lower guide part 13: Outer side wall part 13a: Bent part 14: Inner side wall part 14a: Inner surface 14Ba: Folded part (FIG. 15)
15: Notch (weakened part in FIG. 12)
16: Notch (weakened part in FIG. 13)
17: Slit (weakened part in FIG. 14)
18: Concave portion (weakened portion in FIG. 15)
20: Fixing tool 30: Retractor 30a: Belt outlet 40: Seat belt

Claims (6)

A pretensioner type retractor is disposed behind the belt guide disposed in the vicinity of one of the left and right shoulders of the occupant, and the seat belt passing through the belt guide extends obliquely downward from the shoulder of the occupant. A vehicle occupant restraint device adapted to restrain the occupant
The belt guide has an inner side wall portion extending upward at an end portion on the passenger side,
The inner side wall portion normally restricts the seat belt from being displaced more than a predetermined amount toward the occupant side,
The inner side wall portion is elastically deformed toward the occupant side by receiving a component force toward the occupant side of the tensile force when a tension force of the pretension by the retractor acts on the seat belt, The seat belt is a position displaced toward the occupant side than usual ,
Among the materials constituting the belt guide, the material constituting the inner side wall portion is different from the material constituting the other portion, and the material constituting the inner side wall portion is the material constituting the other portion. It is relatively easy to elastically deform,
An occupant restraint device for a vehicle. A pretensioner type retractor is disposed behind the belt guide disposed in the vicinity of one of the left and right shoulders of the occupant, and the seat belt passing through the belt guide extends obliquely downward from the shoulder of the occupant. A vehicle occupant restraint device adapted to restrain the occupant
The belt guide has an inner side wall portion extending upward at an end portion on the passenger side,
The inner side wall portion normally restricts the seat belt from being displaced more than a predetermined amount toward the occupant side,
The inner side wall portion is elastically deformed toward the occupant side by receiving a component force toward the occupant side of the tensile force when a tension force of the pretension by the retractor acts on the seat belt, The seat belt is a position displaced toward the occupant side than usual,
When the inner side wall portion is elastically deformed, at least a part of the seat belt is displaceable toward the occupant side over the inner side wall portion,
An occupant restraint device for a vehicle. A pretensioner type retractor is disposed behind the belt guide disposed in the vicinity of one of the left and right shoulders of the occupant, and the seat belt passing through the belt guide extends obliquely downward from the shoulder of the occupant. A vehicle occupant restraint device adapted to restrain the occupant
The belt guide has an inner side wall portion extending upward at an end portion on the passenger side,
The inner side wall portion normally restricts the seat belt from being displaced more than a predetermined amount toward the occupant side,
The inner side wall portion is elastically deformed toward the occupant side by receiving a component force toward the occupant side of the tensile force when a tension force of the pretension by the retractor acts on the seat belt, The seat belt is a position displaced toward the occupant side than usual,
The belt guide has an outer side wall portion extending upward at an end opposite to the passenger side,
The height of the inner side wall is higher than the height of the outer side wall,
An occupant restraint device for a vehicle. A pretensioner type retractor is disposed behind the belt guide disposed in the vicinity of one of the left and right shoulders of the occupant, and the seat belt passing through the belt guide extends obliquely downward from the shoulder of the occupant. A vehicle occupant restraint device adapted to restrain the occupant
The belt guide has an inner side wall portion extending upward at an end portion on the passenger side,
The inner side wall portion normally restricts the seat belt from being displaced more than a predetermined amount toward the occupant side,
The inner side wall portion is elastically deformed toward the occupant side by receiving a component force toward the occupant side of the tensile force when a tension force of the pretension by the retractor acts on the seat belt, The seat belt is a position displaced toward the occupant side than usual,
The belt guide has an outer side wall portion extending upward at an end opposite to the passenger side,
The outer side wall portion has a bent portion whose upper end portion is directed toward the occupant side,
The directional extension line of the bent portion is set to pass through a position lower than the upper end of the inner side wall portion,
An occupant restraint device for a vehicle. In any one of Claims 1 thru | or 4 ,
The vehicular occupant restraint device, wherein a weakening portion that promotes elastic deformation of the inner side wall portion is formed in the inner side wall portion or in the vicinity of the inner side wall portion. In any one of Claims 1 thru | or 5 ,
The vehicle occupant restraint device characterized in that at least a base end portion of the inner side wall portion is inclined so as to gradually move toward the occupant as it goes upward.

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