JP2002274320A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device preventing a jamming phenomenon without complicating the structure of a webbing guide. SOLUTION: This seat belt device is provided with a webbing and the webbing guide 10 having a long-hole type webbing insertion hole 14 for inserting the webbing and having a part of its inside face contacting with the webbing and swingably fitted to a fitting wall. The webbing insertion hole 14 is provided with a linear part 15 and inclined parts 16a and 16b connected to the end of the linear part, extending in the inclined direction to the side of a swinging center C relative to the linear part, and having parts of its inner faces to be webbing contact parts. It is so constituted that a normal N in the intermediate point of the webbing contact part of the inclined parts 16a and 16b in a planar view passes through near the swinging center C or passes through the opposite side to the side of the webbing insertion hole 14 of the swinging center C.

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 for restraining the body of an occupant sitting in a seat of an automobile or the like, and more particularly, to a so-called jamming phenomenon in which a webbing slides and leans in a webbing insertion hole of a webbing guide. Related to the structure to prevent.

[0002]

2. Description of the Related Art Conventionally, as a seat belt device, there is a three-point seat belt device using continuous webbing. FIG.
As shown in the figure, a three-point seat belt device (right seat side) 10
0, the webbing 101 has one end connected to the retractor 1
02 so that it can be pulled out. Webbing 101
Is inserted through the through anchor 105 swingably attached to the center pillar 103 so as to be located near the shoulder of the occupant 109, is inserted through the sluting 106,
It is locked by an anchor plate 104 fixed to a lower part of the center pillar 103. By engaging the slut tongue 106 with a buckle 108 disposed near the seat 107, the occupant 109 is seated on the seat 1 by the webbing 101.
07. At this time, the webbing 101 is guided upward from the retractor 102 along the center pillar 103 on one side (the rear side in the figure) of the seat 107, is folded back by the through anchor 105, and is not guided straight down but on the front side of the vehicle. (The left side in the figure) and the other side (the near side in the figure) of the sheet 107 is guided.

As the retractor 102, there is a case where a retractor having a pretensioner for removing slack of the webbing 101 in a vehicle emergency such as a collision is used. In addition, the retractor 102 includes an energy absorbing mechanism that absorbs an impact applied to the occupant's body by extending the webbing by a predetermined amount when a load acting on the webbing becomes equal to or more than a predetermined value in a vehicle emergency. May be used.

In the seat belt device 100, as a webbing guide for guiding the webbing 101, in addition to the through anchor 105 and the sluting 106,
Various things are provided. Each of these webbing guides is provided with an elongated webbing insertion hole. The webbing 101 is inserted into the webbing insertion hole and guided to slide.

[0005] Some webbing guides are formed by forming a webbing insertion hole or a bolt insertion hole in a metal plate of a predetermined shape by press working. In this type of webbing guide, since the webbing contact portion is a metal surface, the frictional resistance to the webbing is low, and the so-called jamming phenomenon in which the webbing slides and leans in the webbing insertion hole may occur. FIG. 4 shows a state in which a jamming phenomenon has occurred in the through anchor 105 on the left seat side. FIG. 4 is a view of the through anchor 105 viewed from the outside of the vehicle. In FIG. 4, a portion extending below the webbing 101 is directed toward a retractor (not shown), and a portion extending leftward is directed toward an occupant (not shown). I have. In order to suppress the jamming phenomenon, there is a through anchor in which a coating resin is provided on a metal plate (insert fitting) by insert molding, and a webbing contact portion is a resin surface.

FIG. 5 shows the shape of a webbing insertion hole in a webbing guide such as a through anchor. The webbing insertion hole 74 in FIG. 5A is configured such that inclined portions 76 a and 76 b extending in an oblique direction with respect to the linear portion 75 are connected to both ends of the linear portion 75. FIG.
The webbing insertion holes 84 in (B) are provided at both ends of the straight portion 85 with inclined portions 86 extending in a direction perpendicular to the straight portion 85.
a and 86b are connected. In addition, an inclined portion 76a extending in an oblique direction is disposed between an inclined portion 86a extending in a vertical direction and a straight portion 85 (FIG. 5C).
There is also a configuration in which the inclined portion 86a extending in the vertical direction and the linear portion 85 are approximately connected by a curve (FIG. 5D). The “inclined portion” referred to in this specification includes a portion that extends in a direction perpendicular to the linear portion 85 as in the example of FIG.

[0007]

There is a need for a webbing guide, such as a through anchor 105 shown in FIG. 4, which is swingably mounted on a mounting wall, in order to prevent the occurrence of a jamming phenomenon. . At this time, it is desirable that the structure is not complicated and that the good winding property of the webbing and the good operation feeling when the webbing is pulled out are not deteriorated. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seat belt device that can prevent a jamming phenomenon without complicating the structure of a webbing guide.

[0008]

Means for Solving the Problems As a result of intensive studies by the present inventors on the conventional through anchor, the following has been found. FIG. 6 is a view of the through anchor in the seat belt device on the right seat side as viewed from the outside of the vehicle (that is, the right side in the figure is the front of the vehicle). As shown in FIG.
In the through anchor 90 provided with the left and right symmetrical webbing insertion holes 94 having a and 96b, a bolt fitting insertion hole 92 is further provided. The center of a bolt (not shown) inserted into the bolt insertion hole 92 is
Swing center C of The webbing 101 inserted through the webbing insertion hole 94 is not only placed on the linear portion 95 but also on the inclined portion 9.
6a and 96b. Webbing 101
When the pretensioner is activated or the energy absorbing mechanism is activated, the through-anchor 90 may be strongly pulled to one side from the other. For example, when the pretensioner operates, the webbing 101 is strongly pulled downward in the drawing. At this time, the tension at the retractor-side portion (the portion extending downward in the drawing) of the webbing 101 becomes higher than the tension at the occupant-side portion (the portion extending rightward in the drawing) with the through anchor 90 as a boundary. This is because a frictional resistance acts on the webbing 101 by passing through the through anchor 90. Webbing 101 when pretensioner is activated
As a result, a pressing vector is generated between the webbing contact portion in the linear portion 95 and the webbing contact portion in the inclined portions 96a and 96b, and each pressing vector tends to swing the through anchor 90. However, most of them are offset on the left and right, and as a result, as a result of the tension imbalance based on the frictional resistance described above, the pressing vector indicated by P1 in the drawing acts on the webbing contact portion of the inclined portion 96a, and the through anchor 90 Rocks. The direction of the pressing vector P1 is the normal direction at the webbing contact portion of the inclined portion 96a.

In the conventional through anchor 90, in the plan view shown in FIG. 6, the normal line N of the inclined portion 96a at the webbing contact portion is formed by the bolt insertion hole 92 and the webbing insertion hole 9
4 and passed. Specifically, the normal line N at the webbing contact portion of the inclined portion 96a intersects a line (direction) γ passing between the swing center C and the center of the linear portion 95 between the bolt fitting insertion hole 92 and the webbing insertion hole 94. Was. For this reason, a moment is generated by the pressing vector P1, and the through anchor 90 is swung around the swing center C in the R1 direction (clockwise direction in the figure). Bolt insertion hole 9
The rotation resistance between the bolt 2 and the bolt and the rigidity of the webbing 101 that is taut serve as a deterrent to stop the swing. However, when the moment due to the pressing vector P1 becomes larger than these deterrents, the through anchor 90 is swung, and at this time, the webbing 101 tries to be the shortest,
Eventually, a jamming phenomenon as shown in FIG. 4 occurs.

From another point of view, a mechanism for causing the swing in the R1 direction will be described. In FIG. 6, the through anchor 90
The webbing 101 is opened substantially symmetrically with respect to. That is, the retractor-side portion and the occupant-side portion of the webbing 101 extend in the directions δ and ε, respectively, which are opened by the same angle α with respect to the direction γ passing through the swing center C and the center of the linear portion 95. When the retractor side portion of the webbing 101 is pulled by the operation of the pretensioner, a pressing vector Pδ toward the retractor side and a pressing vector Pε toward the occupant side are generated at the center of the webbing contact portion in the linear portion 95, but the retractor side. Since the frictional resistance is added to the pressing vector Pδ toward the occupant, the pressing vector Pδ becomes larger than the pressing vector Pε toward the occupant. Therefore, a combined pressing vector P2 obtained by combining the pressing vectors Pδ and Pε is directed toward the retractor from the direction γ. For example, the opening angle 2α of the webbing 101 is set to 80
And the friction coefficient μ of the through anchor 90 with respect to the webbing 101 is 1.4, the angle β formed by the combined pressing vector P2 and the pressing vector Pδ toward the retractor is 32.
°. Since the direction of the composite pressing vector P2 is deviated from the direction γ, a moment acts on the through anchor 90 by the composite pressing vector P2, and the through anchor 90
Is swung in the R1 direction in the figure. Then, a jamming phenomenon as shown in FIG. 4 occurs.

After understanding the above-mentioned swinging mechanism, the present inventors have further studied diligently and have arrived at the following configuration. The present invention has a webbing for restraining an occupant's body to a seat, and an elongated webbing insertion hole through which the webbing is inserted and a part of the inner surface of which is in contact with the webbing, and is swingably attached to a mounting wall. The webbing insertion hole is connected to a straight portion and an end of the straight portion, and extends in a direction inclined to the swing center side with respect to the straight portion. A part of the inner surface thereof has an inclined portion serving as a webbing contact portion, such that a normal line at an intermediate point of the webbing contact portion of the inclined portion passes in the vicinity of the swing center or in plan view. The swinging center is configured to pass through a side opposite to the webbing insertion hole side.
In the above configuration, it is preferable that the webbing contact portion of the linear portion is a metal surface. It is preferable that at least a part of the webbing contact portion of the inclined portion is a metal surface. Further, it is preferable that the metal surface is a part of an insert fitting formed into a predetermined shape and integrated with a resin by insert molding. Preferably, the metal surface is a part of a metal cover attached so as to cover a resin surface. Further, it is preferable that the metal surface is a surface in which a metal is coated on a resin surface by plating, thermal spraying or other methods.

Here, the straight portion of the webbing insertion hole includes:
It is preferable that the inclined portions are connected to both end portions, but the inclined portions may be connected to only one end portion.
In the inclined portion connected to at least one end, the normal line at the midpoint of the webbing contact portion passes through the vicinity of the swing center or the opposite side to the webbing insertion hole side of the swing center. What is necessary is just to be comprised. The vicinity of the swing center refers to the inside of a fitting hole into which a fixture such as a bolt is fitted. For example, it is sufficient that the normal line intersects a line passing through the center of swing C and the center of the linear portion inside the insertion hole.

According to the seat belt device as described above,
Even if a pressing vector acts on the linear portion and the inclined portion of the webbing insertion hole in the webbing guide, the moment generated by the pressing vector can be extremely small to reliably prevent the jamming phenomenon, or it is opposite to the moment causing the jamming phenomenon. By generating a directional moment, the jamming phenomenon can be reliably prevented. The structure of the webbing guide does not become complicated. Furthermore, if the webbing contact portion is made of a metal surface, the frictional resistance is reduced, so that the imbalance in tension between one side and the other side of the webbing at the boundary of the webbing guide is reduced. Therefore, the moment for swinging the webbing guide is reduced. In addition, a good winding property of the webbing and a good operation feeling when the webbing is pulled out can be secured. Further, the mechanical strength of the webbing guide can be increased, and the webbing guide can sufficiently withstand a high load acting on the webbing guide in the event of a vehicle emergency such as a collision.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In addition, about the member etc. already demonstrated, description is simplified or abbreviate | omitted by attaching | subjecting the same code | symbol or an equivalent code | symbol in a figure. FIG. 1A shows a first embodiment of the present invention.
It is the top view which looked at the through anchor in the seat belt device of the right seat side which is an embodiment from the vehicle outside.

As shown in FIG. 1A, through anchor 1
Reference numeral 0 denotes a configuration in which a coating resin 13 is integrated with a predetermined portion of an insert fitting 11 formed by processing a single metal plate into a predetermined shape by insert molding. In addition,
The surface of the through anchor 10 shown in this drawing (the surface on the front side with respect to the paper surface) is opposed to a vehicle body (mounting wall) such as a center pillar when the through anchor 10 is mounted on an automobile. Here, the insert fitting 11 is formed in a triangular shape in a plan view, and near one corner (upper side in the figure),
A fitting hole 12 is provided. By inserting a bolt or the like into the insertion hole 12, the through anchor 10 can be swingably attached to a center pillar or the like. In the vicinity of a side (lower side in the figure) of the insert fitting 11 opposite to the corner where the fitting hole 12 is provided, a long hole extending along the side is formed, and a peripheral portion of the long hole is formed. The cover resin 13 is integrally formed. An elongated webbing insertion hole 14 is defined by the coating resin 13. The webbing insertion hole 14 is provided at an interval from the insertion hole 12, and is connected to the straight portion 15 and both ends of the straight portion 15, and is inclined toward the insertion hole 12 with respect to the straight portion 15. It has extended inclined portions 16a and 16b. Webbing insertion hole 14
Has a line-symmetric shape with respect to a line passing through the swing center C and the center of the linear portion 15.

Examples of the material of the insert fitting 11 include a carbon steel material (JIS SC material). Examples of the coating resin 13 include polyamide resins such as polyamide 6 having high mechanical strength, polyacetal and polypropylene, and resins obtained by adding a reinforcing agent to these resins.

The coating resin 13 which defines the webbing insertion hole 14 is in contact with the portion where the webbing slides (in the figure, the lower surface of the webbing insertion hole 14; the fitting insertion hole 1 of the webbing insertion hole 14).
The surface on the opposite side to the two sides. ) Has a metal cover 17 fixed thereto. The metal cover 17 is made of stainless steel, an iron-based material, an aluminum alloy, a titanium alloy, or the like that can withstand a predetermined load. The metal cover 17 is curved in a substantially cylindrical shape so as to protrude toward the webbing insertion hole 14. Metal cover 17
Is a webbing contact portion in the straight portion 15.

The webbing 101 inserted through the webbing insertion hole 14 is connected to the webbing contact portion of the linear portion 15 and the inclined portion 1.
6a and 16b. Straight section 15
Is sandwiched between the webbing contact portions of the inclined portions 16a and 16b. In the present embodiment, the inclined portion 16
The webbing contact portions a and 16b are on the resin surface (coating resin 13).
Surface). The inclination of the webbing contact portions of the inclined portions 16a and 16b with respect to the straight portion 15 is gentler than that of the conventional one. And the inclined part 16
a, 16b, the normal N at the midpoint of the webbing contact
Pass through the swing center C on the side opposite to the webbing insertion hole 14 side.

FIG. 1B is an enlarged view of the vicinity of the inclined portion 16a on the retractor side of the through anchor 10 of FIG. 1A. The above-mentioned normal line N is the area (webbing contact portion) 2W of the inclined portion 16a to which the webbing 101 can slidably contact in a normal use state where jamming does not occur.
This is a normal line at the middle point in the webbing width direction. It can be said that this middle point in the webbing width direction is a mechanical center that can be considered as a point of application of the pressing force when the pressing force acts on the inclined portion 16a (depending on the magnitude of the pressing force on the inclined portion 16a). Direction average). Therefore, when the inclined portion 16a is not a single shape, the magnitude and direction of the vector per unit length are obtained, and the sum vector is obtained. In the present embodiment, not only the normal N at the midpoint in the webbing width direction, but also all the normals in the entire area of the webbing contact portion 2W are directed to the swing center C or the side opposite to the webbing insertion hole 14 side of the swing center C. Has passed.

According to the through anchor 10 as described above,
For example, when the pretensioner is activated, the webbing insertion hole 14
Even if a pressing vector acts on the inclined portion 16a, the moment generated by the pressing vector becomes a moment in the opposite direction (counterclockwise direction in the drawing) to the moment causing the jamming phenomenon. For this reason, the jamming phenomenon can be reliably prevented. Also, since the webbing contact portion in the straight portion 15 is a metal surface, the through anchor 1
The imbalance in tension between the retractor side and the occupant side of the webbing 101 from the zero is small. Therefore, the moment acting on the through anchor 10 is small. Further, it is possible to sufficiently withstand a high load acting on the through anchor 10 in the event of a vehicle emergency such as a collision, and it is possible to ensure a good winding property of the webbing 101 and a good operation feeling when the webbing 101 is pulled out.

FIG. 2 is a plan view of a through anchor in a seat belt device on the right seat side according to a second embodiment of the present invention, as viewed from the outside of the vehicle. The through anchor 20 is formed by integrating a coating resin 23 at a predetermined position of an insert fitting 21 by insert molding. The coating metal 27 is integrally formed with the coating resin 23 and the insert metal 21.
It is provided so as to cover. This covering metal 27 is a straight part 2
5 and the contact portions 26a 'and 26b' extending into the inclined portions 26a and 26b.

The webbing 101 inserted through the webbing insertion hole 24 is connected to the webbing contact portion of the linear portion 25 and the inclined portion 2.
6a, 26b and the webbing contact portions 26a ', 26b'. A normal line N at an intermediate point between the webbing contact portions 26a 'and 26b' is the webbing insertion hole 14 at the swing center C.
Passes on the opposite side to the side.

In the through anchor 20 as described above, the webbing contact portion of the straight portion 25 and the inclined portions 26a, 2
The webbing contact portions 26a 'and 26b' of 6b are both metal, and their coefficient of friction is low and constant. Accordingly, the imbalance in tension between the retractor side and the occupant side of the webbing 101 at the boundary of the through anchor 20 is extremely small.

It should be noted that the present invention is not limited to the above-described embodiments and examples, and appropriate modifications and improvements can be made. For example, the present invention is not limited to through anchors, but can be applied to any webbing guide that is swingably attached to a mounting wall.

[0025]

As described above, according to the present invention,
A seat belt device that can prevent the jamming phenomenon without complicating the structure of the webbing guide can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing a through anchor of a seat belt device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a through anchor of a seat belt device according to a second embodiment of the present invention.

FIG. 3 is an overall view of a seat belt device.

FIG. 4 is a diagram illustrating a jamming phenomenon.

FIG. 5 is a diagram showing an example of the shape of a webbing insertion hole.

FIG. 6 is a diagram illustrating a swing mechanism in a conventional through anchor.

[Explanation of symbols]

10, 20 Through anchor (webbing guide) 11, 21 Insert fitting 12, 22 Fitting hole 13, 23 Coating resin 14, 24 Webbing insertion hole 15, 25 Linear portion 16a, 16b, 26a, 26b Inclined portion C Swing center N Normal

Claims (6)

[Claims] 1. A webbing for restraining an occupant's body to a seat, and a long webbing insertion hole through which the webbing is inserted and a part of an inner surface of the webbing is in contact with the webbing so that the mounting wall can swing. In the seat belt device provided with a webbing guide to be attached, the webbing insertion hole is connected to a straight portion and an end of the straight portion, and is inclined in a direction inclined toward the swing center with respect to the straight portion. A part of the inner surface extending and having an inclined portion serving as a webbing contact portion, so that a normal line at an intermediate point of the webbing contact portion of the inclined portion passes near the swing center in plan view or A seat belt device configured to pass through a side opposite to the webbing insertion hole side of the swing center. 2. The seat belt device according to claim 1, wherein the webbing contact portion of the linear portion is a metal surface. 3. The seat belt device according to claim 1, wherein at least a part of the webbing contact portion of the inclined portion is a metal surface. 4. The seat belt device according to claim 2, wherein the metal surface is a part of an insert fitting molded into a predetermined shape and integrated with a resin by insert molding. 5. The seat belt device according to claim 2, wherein the metal surface is a part of a metal cover attached so as to cover a resin surface. 6. The seat belt device according to claim 2, wherein the metal surface is a surface of a resin surface coated with metal by plating, thermal spraying, or another method.