JP2000185625A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of increasing an energy absorption load with a compact seat belt retractor. SOLUTION: In the seat belt device, a retractor 10 on which a webbing 1 is wound is provided with an energy absorption mechanism and the webbing 1 is engaged with an anchor plate 5 through a through anchor 30. Since the through anchor 30 is provided with the energy absorption mechanism for slidably clamping the webbing 1, a portion of an energy absorption load is burdened by the through anchor 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device provided with an energy absorbing mechanism in a retractor (winding device), and more particularly to a seat belt device with an improved energy absorbing load.

[0002]

2. Description of the Related Art Conventionally, a retractor for a seatbelt provided in a seatbelt device for holding an occupant or the like of a vehicle safely in a seat is provided by an inertia sensing means which responds to sudden acceleration, collision or deceleration. An emergency lock retractor is provided which has an emergency lock mechanism for physically locking the vehicle and effectively and safely restrains an occupant.

[0003] Such an emergency lock type retractor is disclosed in, for example, Japanese Patent Application Laid-Open No. 50-79024 and Japanese Patent Publication No.
As in the seat belt retractor disclosed in Japanese Patent Publication No. 21624 and Japanese Utility Model Publication No. 2-45088, a locking member provided at one end of a winding shaft on which the webbing is wound is provided with a retractor base in a vehicle emergency. There is one provided with a locking means that can be engaged with the locked portion to prevent the winding shaft from rotating in the webbing withdrawing direction.

In the locking means, locking teeth formed in a winding shaft through-hole of a retractor base through which the winding shaft passes, and a latch plate formed in the winding shaft through-hole are formed. While the locking teeth are used as locked parts, lock plates and pawls that rotate with the winding shaft are used as locking members, and when the vehicle is in an emergency, the locking members and the locked parts are engaged. The winding shaft is configured to prevent rotation in the webbing withdrawing direction.

On the other hand, when the impact force due to the collision is extremely large, the webbing tension increases with the lapse of time after the collision, so that the occupant's body suddenly decelerates, and the tension applied from the webbing to the occupant is extremely high. growing. Therefore, when the load acting on the webbing is equal to or greater than a predetermined value set in advance, the webbing is extended by a predetermined amount to provide an energy absorbing mechanism that absorbs an impact generated on the occupant's body, thereby more reliably securing the occupant's body. Various seat belt retractors designed to protect the seat belt have been proposed. As an example of a seat belt retractor having such a configuration, an "energy absorbing device especially for a safety belt" described in JP-A-46-7710 is known.

[0006] The energy absorbing device is a winding member (bobbin) serving as a portion to which the energy absorbing device transmits power.
And a holder (retractor base) rotatable relative to the winding member, and a torsion bar (an energy absorbing mechanism composed of a torsion bar) is provided between the holder and the winding member. Is arranged. Therefore,
When the load is further applied after the rotation of the winding shaft is stopped in the event of a vehicle emergency, the torsion bar itself is twisted, so that the collision energy acting on the occupant's body is absorbed as deformation work of the torsion bar. .

[0007]

Incidentally, in recent years, there has been a demand for an increase in the energy absorption load by the energy absorption mechanism. The torsion bar described in JP-A-46-7710 has a structure in which one end of the torsion bar is fixed, and the other end is plastically deformed by applying a torque to the other end. To increase it, the torsion bar itself must be enlarged. However, increasing the size of the torsion bar itself has inevitably increased the size of peripheral components. As a result, there is a problem that the seat belt retractor itself becomes large.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a seat belt device capable of increasing an energy absorbing load while having a compact structure for a seat belt retractor.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a seat belt device in which a retractor for winding a webbing has an energy absorbing mechanism and the webbing is locked to an anchor plate via a through anchor. This is achieved by providing a seat belt device, wherein the through anchor is provided with an energy absorbing mechanism that slidably holds the webbing.

According to the present invention, in the event of a vehicle emergency such as a vehicle collision, the energy absorbing mechanism of the through anchor slidably clamps the webbing to absorb the impact energy acting on the occupant together with the energy absorbing mechanism of the retractor. . Therefore, energy can be absorbed by the energy absorbing mechanism of the through anchor, so that the energy absorbing load can be increased while the size of the seat belt retractor is the same as the conventional one. In some cases, the retractor itself can be reduced in size as compared with the related art by increasing the energy absorption load in the through anchor.

Here, as a configuration in which the through anchor is provided with an energy absorbing mechanism, a support member for supporting the webbing provided in the through anchor, for example, a shaft-shaped member or a plate-shaped member is used to mount the webbing in an emergency of a vehicle. It is preferable to slidably hold.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a configuration of a three-point seat belt device according to one embodiment of the present invention.

As shown in FIG. 1, in the seat belt device, one end of the webbing 1 is retracted (winding device).
10, the other end thereof passes through the through anchor 30, and is locked to the anchor plate 5 which is supported by the lower end of the center pillar 3 fixed to the vehicle body. The passenger is held on the seat 2 by engaging a slut tong 7 disposed on the webbing 1 between the buckle 9 and the buckle 9 erected substantially at the center of the vehicle body.

The retractor 10 is disclosed in, for example,
An energy absorbing mechanism having a torsion bar described in, for example, JP-A-277904. The energy absorbing mechanism having this torsion bar is disclosed in
Although the specific configuration is omitted since it is described in JP-A-7904 or the like, for example, after the pulling-out of the webbing 1 is prevented by the locking means provided in the retractor, the webbing 1 is further loaded (winding the webbing). When the torsion bar itself is twisted and the bobbin is rotated, the webbing 1 is pulled out to absorb the impact transmitted to the occupant. However, the present invention is not limited to the energy absorbing mechanism having the torsion bar, and may be another energy absorbing mechanism.

FIG. 2A is a side view of the through anchor 30 according to the first embodiment of the present invention, and FIG. 2B is a front view of the through anchor 30. FIG. 2 (a),
As shown in (b), the through anchor 30 having the energy absorbing mechanism includes a base 31 rotatably attached to the center pillar 3 by bolts B, side plates 33a and 33b erected from the base 31, and Side plate 33a,
And a shaft 35 supporting the webbing 1 and being bridged on 33b.

The shaft 35 has a rectangular parallelepiped end 35.
a, 35b are supported by the elongated holes 33h of the side plates 33a, 33b. The elongated hole 33h is provided with a protruding portion 33t which protrudes inward. The protruding portion 33t supports the ends 35a and 35b of the shaft 35, so that the shaft 35 can be used when normal webbing is used. 35 is immobile.

Next, an operation when a load is applied to the through anchor 30 in a vehicle emergency such as a vehicle collision will be described. In the event of a vehicle emergency, when the locking means of the retractor is operated and the withdrawal of the webbing 1 is prevented, the force applied by the occupant acts on the webbing 1. Then, Figure 2
(A) In the middle, a tensile force in the R direction is applied, and the shaft 35
The load is also applied to. Then, the end 35a of the shaft 35,
The protrusion 33t provided in the long hole 33h of the side plates 33a, 33b is cut by 35b, and the shaft 34 moves obliquely downward in the drawing, that is, in the direction of arrow B along the long hole 33h, as shown in FIG.
As shown in (a) and (b), the ends 35a and 35b abut the edge of the elongated hole 33h. Therefore, the movement of the shaft 35 is stopped, and the webbing 1 is slidably held between the shaft 35 and the base 31. Therefore, an energy absorbing load can be obtained by sliding the webbing 1 while being pinched. Also, during this time, the energy absorbing mechanism provided in the retractor is also operated, so that the energy absorbing load in addition to the energy absorbing load of the energy absorbing mechanism is applied to the through anchor 30 according to the first embodiment of the present invention. Can be obtained by As a result, the energy absorption load can be increased without increasing the size of the retractor.

By appropriately changing the size and hardness of the projection 33t of the elongated hole 33h, the load at which the shaft 35 starts to move can be appropriately set, and the elongated hole 33h can be set.
By appropriately changing the size in the downward direction and adjusting the gap between the shaft 35 and the base 35 during energy absorption, the holding force can be appropriately set.

Next, a through anchor according to a second embodiment of the present invention will be described. FIG. 4A shows a second embodiment of the present invention.
It is a side view of the through anchor 40 according to the embodiment,
(B) is a front view of the through anchor 40.

As shown in FIGS. 4A and 4B, a through anchor 40 having an energy absorbing mechanism includes a fixed side through 43 fixed to a center pillar by bolts B,
And a movable side through 41 that is rotatably mounted on the center pillar with the bolt B so as to overlap the fixed side through 43. The fixed side through 43 is provided with a bolt through hole 43h through which the male screw portion 47a of the bolt B penetrates, and a webbing through hole 43a through which the webbing 1 penetrates. On the other hand, the movable side through 41 has a bolt through hole 41h formed by a shape in which a root portion 47 of the bolt B penetrates and a circular hole is overlapped, and the size of the hole is smaller than that of the webbing through hole 43a. The webbing through hole 41a which is set small is provided. FIG. 5 is a partial cross-sectional view of a state in which the head of the bolt B of FIG. 4B is cut, and a state in which the root portion 47 of the bolt B is fitted into the lower hole of the bolt through hole 41h. It is shown.

Next, the operation when a load is applied to the through anchor 40 in a vehicle emergency such as a collision will be described.
In the event of a vehicle emergency, the webbing 1 has R in FIG.
When an excessive tensile force in the direction is applied, a load is applied to the webbing through hole 41a of the movable side plate 41 accordingly. When a load is applied to the webbing through hole 41a, the movable plate 41 attempts to move in the direction D in FIG.
Bolt B fitted into lower hole of bolt through hole 41h
Of the bolt 41h of the bolt through-hole 41h is shaved and finally fitted into the hole above the bolt through-hole 41h. As a result, as shown in FIG. 6, the webbing 1 is slidably sandwiched between the upper edge of the webbing through hole 41a of the movable plate 41 and the lower edge of the webbing through hole 43a of the fixed plate 43. Therefore, the webbing through hole 41
When the webbing 1 is slid while being sandwiched by the a and 43a, an energy absorbing load in addition to the energy absorbing load by the energy absorbing mechanism of the retractor can be obtained. As a result, the energy absorption load can be increased without increasing the size of the retractor.

The protrusion 41t of the bolt through hole 41h
By appropriately changing the size and hardness of the webbing through holes 41a and 43a, the load at which the movable plate 41 starts moving can be appropriately set, and the size of the bolt through holes 41h can be changed. By changing the respective positional relationships, the holding force can be appropriately set.

Next, a through anchor according to a third embodiment of the present invention will be described. FIG. 7A shows a third embodiment of the present invention.
FIG. 4B is a side view of the through anchor 50 according to the embodiment (one side plate is omitted for simplicity), and FIG.
Is the operating state of (a).

As shown in FIGS. 7A and 7B, the through anchor 50 having the energy absorbing mechanism has a base 51 which is attached to the center pillar via a hole 52 by a bolt. A side plate 54 and another side plate (not shown) parallel to the side plate 54 are erected on the base 51, and holes 58 parallel to the base 51 are formed in the side plate 54 and the other side plate, respectively. They are provided on the same line. The base 51 is provided with a flat rotation regulating surface 5.
An ampill 64 having a flat structure with a flat clamp surface 55 is supported between both side plates as in the case of FIG.

The shaft 66 is supported by holes 58 provided on both side plates. The shaft 66 supports a through plate 68 formed of a resin material or a metal material coated with a resin. I have. The lower end of the through plate 68 has a rib 61 that guides the webbing 1 and regulates the range of rotation with respect to the side plate 54 during rotation, and a curved clamping surface 62, and the upper end allows the webbing to pass through. Through section 60 with sufficient width and clearance
Having. During normal use, the through plate 68 is fixed to the vertical position by a small-diameter lock pin 65.

The webbing 1 pulled out from the retractor passes between the through plate 68 and the ampill 64 and reaches the shoulder of the seat belt wearer via the through portion 60. At the time shown in FIG. 7A, the webbing 1 is set so as not to contact the ampill 64. Further, the through plate 68 receives the turning power in the pulling-out direction of the webbing 1, but does not rotate with the pulling-out force during normal use due to the presence of the lock pin 65.

When the locking means of the retractor is actuated at the time of a vehicle collision or the like and an excessive tensile force in the R direction is applied to the webbing 1, the lock pin 65 breaks beyond the shear limit, thereby breaking the through plate 68. Rotates around the shaft 66 to the position shown in FIG. At this time, the rib 61 of the through plate 68 comes into contact with the rotation restricting surface 54 of the ampill 64, and the rotation of the through plate 68 is stopped. At the same time, the webbing 1 is held between the clamp surface 62 of the through plate 68 and the clamp surface 55 of the ampill 64. However, since the rotation restriction between the rib 61 and the rotation restriction surface 54 causes a gap between the rotation restriction surface 54 of the ampill 64 and the clamp surface 55, the gap is not completely sandwiched.

This causes a state in which the webbing 1 can be pulled out, that is, a state in which the webbing 1 is slidably held, so that the energy absorbing load of the through anchor 50 is added to the energy absorbing load of the retractor. And the belt tension at the occupant shoulder increases. That is, the energy absorption load can be increased without increasing the size of the retractor. Here, if the webbing 1 is pinched so that it cannot be completely pulled out, it becomes impossible to contribute to energy absorption. Therefore, the webbing 1 is pinched so that it can be pulled out.

By changing the step between the rotation restricting surface 54 and the clamp surface 55, the gap between the webbings can be adjusted, the frictional resistance can be changed, and the pull-out load can be adjusted. Further, instead of using the lock pin 65 as the rotation fixing means, for example, a spring S which is set to extend when a predetermined load is applied as shown by an imaginary line in FIG. 7B may be used. In the case of the lock pin 65, since the break is used as the operation start means, a slight disturbance may occur in the tension of the webbing 1 at the moment of the break, but in the case of the spring S, the displacement is gradual. , The tension of the webbing 1 is not disturbed, and more stable energy absorption characteristics can be obtained.

Next, a through anchor according to a fourth embodiment of the present invention will be described. FIG. 8 is a perspective view of a through anchor 70 according to the fourth embodiment of the present invention, and FIG.
(A) is a side view of the through anchor 70, (b)
7 is a front view of the through anchor 70. FIG.

As shown in FIGS. 8, 9 (a) and 9 (b),
A through anchor 70 having an energy absorbing mechanism includes a base 71 rotatably attached to a center pillar by a bolt B, and a side plate 71 s erected from the base 71.
And a shaft 75 bridged on the side plate 71s and supporting the webbing 1.

The shaft 75 has a rectangular parallelepiped end 75a.
Are supported by the long hole 71h of the side plate 71s. The side plate 71s is provided with a U-shaped plate 71u at its lower end. One end of the U-shaped plate 71u is connected to the shaft 75 by bolts 71t. The U-shaped plate 71u and the shaft 75 may be connected by welding or the like without using the bolt 71t.

Next, an operation when a load is applied to the through anchor 70 in a vehicle emergency such as a collision will be described.
In the event of a vehicle emergency, the webbing 1 has R in FIG.
When an excessive tensile force in the direction is applied, a load from the webbing 1 is applied to the shaft 75. Then, as shown in FIG. 10, the U-shaped plate 71u connected to the shaft 75 is plastically deformed and the U-shaped portion is narrowed.
a moves in the long hole 71h of the side plate 71s. as a result,
When the shaft 75 moves from the state shown in FIG. 11A to the state shown in FIG. 11B, the webbing 1 is slidably held between the shaft 75 and the side plate 71. Therefore, the webbing 1 slides while being sandwiched between the shaft 75 and the side plate 71, so that an energy absorbing load in addition to the energy absorbing load by the energy absorbing mechanism of the retractor can be obtained. As a result, the energy absorption load can be increased without increasing the size of the retractor.

FIG. 12 is a partially enlarged view of the vicinity of the shaft 75. As shown in FIG. 12, the shaft 75 is
Is provided, and flanges 75s are provided at both ends of the body 75d. And
By appropriately adjusting the thickness t of the flange portion 75s from the body portion 75d, the load when the webbing 1 is sandwiched between the body portion 76d and the side plate 71 can be adjusted.

A through anchor as shown in FIGS. 13 and 14 is also a modification of the fourth embodiment of the present invention. Hereinafter, each through anchor will be specifically described. 13 is a base 81 rotatably attached to a center pillar by a bolt B.
And a side plate 81s erected on the base 81, and is characterized by a long hole 81h that bridges the axis of the side plate 81s. That is, since the shaft end 75a can be supported by the pair of protrusions 81t protruding inward of the elongated hole 81h, a deformable U-shaped portion is required as in the above-described fourth embodiment. do not do. Also, by appropriately changing the size and hardness of the projection 81t of the elongated hole 81h, the shaft 75
The load at which the webbing starts to move can be appropriately set, and by adjusting the length of the long hole 81h in the longitudinal direction to adjust the amount of movement of the shaft 75, the webbing can be slidably held. The power can be adjusted.

The through anchor of FIG. 14 is also characterized by a long hole 91h that bridges the axis to the side plate 81s. That is, FIG.
The end 75a of the shaft can be supported by a pair of protrusions 91t provided in the elongated hole 91h, as in the through anchor described above. An inclined portion 91c is provided on the right side of the long hole 91h so that the size of the hole gradually becomes smaller, and the amount of movement of the shaft 75, that is, the sandwiching gap of the webbing is adjusted, so that the energy absorbing load is adjusted according to the energy of the collision. Can be adjusted.

[0037]

As described above, in the seat belt device of the present invention, not only the retractor but also the through anchor has the energy absorbing mechanism, so that the through anchor can bear a part of the energy absorbing load. it can. Therefore, it is not necessary to increase the size of the energy absorbing mechanism of the retractor in order to increase the energy absorbing load, and the energy absorbing mechanism of the through anchor can increase the energy absorbing load.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a three-point seat belt device according to an embodiment of the present invention.

FIG. 2A is a side view of the through anchor 30 according to the first embodiment of the present invention, and FIG. 2B is a front view of the through anchor 30.

FIG. 3 shows a state in which the through anchor 30 of FIG. 2 is activated in a vehicle emergency.

FIG. 4A is a side view of a through anchor 40 according to a second embodiment of the present invention, and FIG. 4B is a front view of the through anchor 40.

FIG. 5 is a partial cross-sectional view of a state in which a head of a bolt B of FIG. 4B is cut.

FIG. 6 shows a state in which the through anchor 40 of FIG. 4 has been activated in a vehicle emergency.

FIG. 7A is a side view of a through anchor 50 according to a third embodiment of the present invention (one side plate is omitted for simplicity), and FIG. 7B is a side view of FIG. It is operating.

FIG. 8 is a through anchor 7 according to a fourth embodiment of the present invention.
FIG.

FIG. 9A is a side view of the through anchor 70,
FIG. 3B is a front view of the through anchor 70.

FIG. 10 shows a state in which the through anchor 70 of FIG. 9 is activated in a vehicle emergency.

FIGS. 11A and 11B are explanatory diagrams of an operation state of a through anchor 70. FIGS.

FIG. 12 is a partially enlarged view near a shaft 75;

FIG. 13 is a modified example of the through anchor 70 of FIG. 9;

FIG. 14 is a modification example of the through anchor 70 of FIG. 9;

[Explanation of symbols]

 1 Webbing 10 Retractor 30, 40, 50, 70 Through anchor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshifumi Taguchi 12 Kirihara-cho, Fujisawa-shi, Kanagawa Nippon Seiko Co., Ltd. (72) Inventor Satoshi Hirase 12 Kirihara-cho, Fujisawa-shi, Kanagawa Nippon Seiko F Terms (reference) 3D018 CA09 CB02 DA03 DA07

Claims (1)

[Claims] 1. A seat belt device in which a retractor for winding a webbing has an energy absorbing mechanism and the webbing is locked to an anchor plate via a through anchor, wherein the webbing is slidable on the through anchor. A seat belt device comprising an energy absorbing mechanism for clamping.