JP4395875B2 - Seat belt anchor structure - Google Patents

Description

  The present invention relates to a restraint device for protecting an occupant of an automobile, and more particularly to an anchor structure of a seat belt having a collision energy absorption characteristic.

  FIG. 5 shows a seat belt structure 1 for a front seat in a conventional automobile such as a passenger car. In the seat belt structure 1, the belt retractor 2 is disposed in the passenger compartment near the lower portion of the center pillar 3, and the seat belt 4 extending from the belt retractor 2 so as to extend and contract passes through the center pillar 3. The seat belt 4 is folded back at the upper shoulder belt attaching portion 5 and pulled out into the vehicle interior. The pulled-out seat belt 4 extends to near the lower portion of the center pillar 3 and is fixed to the center pillar lower portion 3a.

  The shoulder belt attaching portion 5 of the seat belt structure 1 is attached to the center pillar 3 as shown in FIG. Specifically, as shown in FIG. 6, the shoulder belt attachment portion 5 is attached to the center pillar 3 via the adjustable anchor structure 6. The adjustable anchor structure 6 has an elongate anchor 6a whose upper and lower ends are fastened to the center pillar 3 by bolts, and is slidable along the longitudinal direction with respect to the anchor 6a and can be fixedly held at an appropriate position. The shoulder belt mounting portion 5 is fixed to the slider 6b.

  When the seat belt 4 is mounted, a tongue plate (not shown) attached slidably near the middle of the seat belt 4 in a state where an occupant is seated on the front seat (not shown) of the automobile. By engaging with a buckle (not shown) provided on the center side of the front seat, the occupant is securely held by the front seat. At that time, according to the physique of the occupant seated on the front seat, the shoulder belt mounting portion 5 is brought to an appropriate height position by sliding the slider 6b of the adjustable anchor structure 6 in the direction of arrow A with respect to the anchor 6a. It is adjusted and fixed and held by locking means (not shown).

  In the seat belt structure 1 having such a configuration, when an impact force is applied to the seat belt 4 due to a relatively forward acceleration applied to the occupant at the time of a car collision or the like, the preload provided in the belt retractor 2 is provided. The tensioner and the force limiter reduce the acceleration (so-called chest G) applied to the occupant's chest.

For example, Patent Document 1 also discloses a structure in which a shoulder belt attaching portion is attached to a center pillar so that the position of the shoulder belt attaching portion can be adjusted.
Japanese Patent No. 3557704

  By the way, in recent years, automobile bodies have been configured to have collision energy absorption (EA) characteristics in order to satisfy shock absorption for various collision modes. As a result, the body strength of automobiles has been remarkably increasing year by year, so ensuring the occupant's living space and escaping performance have improved, but the vehicle deceleration characteristics have increased, and in the event of a collision, etc. The acceleration of the occupant's chest by the seat belt is high.

  Therefore, as described above, the pretensioner and the force limiter provided in the belt retractor 2 are further provided with an occupant protection holding device such as an airbag structure, so that the head, chest, knees, etc. The injury value is reduced. However, there is a limit to the reduction of the chest injury value due to the EA characteristic by such pretensioner and force limiter. Further, the adjustable anchor structure 6 for attaching the shoulder belt attaching portion 5 to the center pillar 3 is not configured to have EA characteristics.

  The present invention has been created in view of the above points, and has an EA characteristic with a simple configuration, and a seat belt anchor that can further reduce an occupant's chest injury value due to a seal belt. Its purpose is to provide a structure.

  To achieve the above object, the present invention provides an anchor attached to a highly rigid portion such as a pillar of an automobile, a shoulder belt that is slidable in the vertical direction with respect to the anchor and fixed at an arbitrary position. An anchor structure of a seat belt including a slider to which an attachment portion is attached, wherein the anchor has a first anchor member whose upper end is fastened to a highly rigid portion such as a pillar and extends downward, and a lower end that is a pillar A second anchor member that is fastened to a highly rigid portion such as the like and extends upward, and the lower end of the first anchor member is engaged with the second anchor member, and the second anchor member The upper end of the first anchor member is engaged with the first anchor member, and the second anchor member is arranged so that the region excluding the lower end thereof overlaps the region excluding the upper end of the first anchor member. In the first anchor member and the second anchor member, a slider is slidably attached to a region exposed to the vehicle interior side, and a strong tensile force is applied to the seat belt at the time of a collision or the like. When the first anchor member and the second anchor member slide in the longitudinal direction, the first anchor member and the second anchor member are deformed to the vehicle interior side.

In the seatbelt anchor structure of the present invention, the second anchor member is inserted into a laterally extending slit provided at the lower end of the first anchor member, and the lateral anchor provided at the upper end of the second anchor member. A first anchor member is inserted through a slit extending in the direction.
The anchor structure of the seat belt of the present invention can be suitably used as an anchor structure for a front seat, for example.

  According to the above configuration, when a strong tensile force is applied to the seat belt in the event of a car collision or the like, a load from the seat belt to the vehicle interior side acts on the slider via the shoulder belt mounting portion. Thereby, since both the first anchor member and the second anchor member are fastened to the pillar or the like at the upper end and the lower end of the anchor, the overlapping portions on the opposite side are at the upper end and the lower end. By moving in the direction, they are displaced toward the vehicle interior side while sliding in the longitudinal direction. Accordingly, when the slider moves away from the pillar or the like and moves toward the vehicle interior side, the shoulder belt attaching portion and the seat belt move toward the vehicle interior side, so that the tightening force of the seat belt on the occupant is eased. Thereby, the acceleration with respect to a passenger | crew's chest by a seatbelt is reduced further. Further, the combination with the force limiter built in the belt retractor widens the stroke tuning range at the time of the collision of the seat belt, so that it can be applied to various vehicle types.

  Thus, according to the present invention, by providing the anchor with a collision energy absorption characteristic (EA characteristic), the acceleration to the occupant's chest by the seat belt at the time of a collision of the automobile, that is, the injury value is further reduced, The safety of passengers is further secured.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is a view showing an anchor structure 10 for a seat belt according to an embodiment of the present invention. The anchor structure 10 for a seat belt is configured to be used in a seat belt mounting structure for a front seat of an automobile. The center pillar 11 includes an anchor 12 attached to the inside of the vehicle, and a slider 13 slidably fixed to the anchor 12 at an arbitrary position.

  Here, the anchor 12 is comprised from the two anchor members 14 and 15 formed in the strip shape by the steel material in the case of illustration. That is, as shown in FIGS. 1 and 2, the anchor 12 includes a first anchor member 14 whose upper end is fastened to the center pillar 11 and extends downward, and a second lower end that is fastened to the center pillar 11 and extends upward. Anchor member 15. The second anchor member 15 is arranged so that the region excluding the lower end thereof overlaps the region excluding the upper end of the first anchor member 14. Furthermore, in the case of illustration, as for the 1st anchor member 14, the area | region except the upper end has overlapped with the vehicle interior side with respect to the area | region except the lower end of the 2nd anchor member 15.

  The first anchor member 14 includes a slit-like engagement hole 14a near the lower end, and the second anchor member 15 includes a slit-like engagement hole 15a near the upper end. The first anchor member 14 has the second anchor member 15 inserted through the engagement hole 14a, and the second member 15 has the first member 14 inserted through the engagement hole 15a. . Thereby, the 1st anchor member 14 and the 2nd anchor member 15 are comprised so that sliding mutually in the up-down direction in FIG.

  At the time of assembly, after the first anchor member 14 and the second anchor member 15 are engaged with each other as shown in FIG. 2, the upper end of the first anchor member 14 is fastened to the center pillar 11 with a bolt. At the same time, the lower end of the second anchor member 15 is similarly fastened to the center pillar 11 by a bolt.

  The slider 13 is attached to the first anchor member 14 exposed to the vehicle interior side of the anchor 12 so as to be slidable along the longitudinal direction thereof. The slider 13 is fixed at an arbitrary position of the first anchor member 14 in the same manner as a conventionally known anchor structure. As shown in FIG. 1, a shoulder belt mounting portion 17 for locking a seat belt 16 extending from a belt retractor (not shown) is attached to the slider 13.

  The seat belt anchor structure 10 according to the embodiment of the present invention is configured as described above, and in use, the slider is adjusted in accordance with the height of the shoulder of the occupant while the occupant is seated on the front seat. 13 is moved and adjusted to an appropriate height with respect to the anchor 12. Then, by fixing a tongue plate (not shown) slidably mounted near the middle of the seat belt 16 to a buckle (not shown) provided on the center side of the front seat, the occupant can move the front seat. Is held securely. Thereby, normally, as shown in FIG. 1, the seat belt 16 is given a tensile force F1 by the pretensioner built in the belt retractor. In this case, since the tensile force F1 is relatively small, the anchor 12 is not deformed by the tensile force F.

  Here, as shown in FIG. 3, when a strong tensile force F <b> 2 is applied to the seat belt 16 at the time of a car collision or the like, the slider 13 and the first anchor are connected from the seat belt 16 through the shoulder belt mounting portion 17. A load on the inside of the vehicle interior acts on the member 14. Therefore, the first anchor member 14 of the anchor 12 pulls the second anchor member 15 through the engagement portions with the second anchor member 14, that is, the engagement holes 14a and 15a. At that time, since the upper end of the first anchor member 14 and the lower end of the second anchor member 15 are fastened and fixed to the center pillar 11 respectively, the first anchor member 14 and the second anchor member 15 overlap each other. And the lower end portion of the first anchor member 14 in which the engagement hole 14a is formed and the upper end portion of the second anchor member 15 in which the engagement hole 15a is formed are close to each other. It will be.

  As a result, the entire anchor 12 extends, and the vicinity of the center where the slider 13 is attached is displaced toward the vehicle interior side. Accordingly, when the slider 13 moves away from the center pillar 11 and moves toward the vehicle interior side, the shoulder belt mounting portion 17 and the seat belt 16 move toward the vehicle interior side, so that the stroke of the seat belt 16 by the force limiter is expanded. As a result, the tightening force of the seat belt 16 on the chest of the occupant is alleviated. In this way, the acceleration of the occupant's chest due to the seat belt 16 at the time of a collision or the like is further reduced.

  FIG. 4 shows a simulation result of the relationship between the displacement of the chest of the occupant and the injury value at the time of collision by the seat belt anchor structure 10 according to the present invention. In FIG. 4, in the anchor structure of the seat belt according to the present invention (shown by a dotted line), the displacement of the chest is increased and the injury value of the chest is reduced as compared with the comparative example (shown by the solid line) of the conventional anchor structure. You can see that As shown in this figure, according to the seatbelt anchor structure 10 of the present invention, the acceleration of the occupant's chest by the seatbelt 16, that is, the injury value, is further reduced in the event of a car collision or the like. Thus, it was confirmed that safety could be further secured.

  As described above, the present invention can be implemented in various forms without departing from the spirit of the present invention. For example, in the above-described embodiment, the first anchor member of the anchor overlaps the second anchor member on the vehicle interior side from the second anchor member. The second anchor member may overlap the first anchor member on the vehicle interior side from the first anchor member. In this case, the slider is slidably attached to the second anchor member exposed to the vehicle interior side.

  In the embodiment described above, the anchor structure 10 attached to the center pillar is described for the seat belt structure in the front seat of the automobile. However, the present invention is not limited to this, and the seat belt structure in other seats such as the rear seat. For example, it is apparent that the present invention can be applied to a pillar structure such as a C pillar or an anchor structure attached to the same highly rigid portion.

It is a schematic side view which shows the anchor structure of the seatbelt which concerns on embodiment of this invention. The structure of the anchor used with the anchor structure of FIG. 1 is shown, (A) is a front view, (B) is a side view. It is a schematic side view which shows the deformation | transformation state at the time of a collision in the anchor structure of FIG. It is a graph which shows the relationship between the displacement amount and acceleration of a passenger | crew's chest at the time of the collision by the anchor structure of FIG. It is a schematic front view which shows the structure of an example of the seatbelt attachment structure provided with the conventional adjustable anchor structure. It is a schematic side view which shows the adjustable anchor structure of FIG.

Explanation of symbols

10 Seat belt anchor structure 11 Center pillar (pillar)
12 Anchor 13 Slider 14 First Anchor Member 15 Second Anchor Member 16 Seat Belt 17 Shoulder Belt Mount

Claims (3)

An anchor attached to a highly rigid part such as an automobile pillar, and a slider slidable in the vertical direction with respect to the anchor and fixed at an arbitrary position and to which a shoulder belt attaching portion is attached. An anchor structure of a seat belt,
The anchor has a first anchor member whose upper end is fastened to a highly rigid portion such as a pillar and extends downward, and a second anchor member whose lower end is fastened to a highly rigid portion such as a pillar and extends upward; Consisting of
The lower end of the first anchor member is engaged with the second anchor member, and the upper end of the second anchor member is engaged with the first anchor member, and the second anchor The member is arranged so that the region excluding the lower end thereof overlaps the region excluding the upper end of the first anchor member,
Of the first anchor member and the second anchor member, the slider is slidably attached to a region exposed to the vehicle interior side,
When a strong tensile force is applied to the seat belt at the time of a collision or the like, the first anchor member and the second anchor member are deformed to the vehicle interior side while sliding in the longitudinal direction. , Seat belt anchor structure. In the slit extending in the lateral direction provided at the lower end of the first anchor member, the second anchor member is inserted,
2. The seat belt anchor structure according to claim 1, wherein the first anchor member is inserted into a slit extending in a lateral direction provided at an upper end of the second anchor member. 3.   The seat belt anchor structure according to claim 1 or 2, wherein the seat belt is a seat belt for a front seat, and the anchor is attached to a center pillar.

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