JP2001080459A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a good slide-contact property of a webbing guide and a webbing in spite of a simple structure. SOLUTION: A seat belt device is provided with a webbing for restricting an occupant body to a seat and a webbing guide 10 for slide-contacting with the webbing and guiding it. The webbing guide 10 is formed by molding a cover resin 13 to an insert fitting. A portion for slide-contacting with the webbing in the webbing guide 10 is formed by winding a metal plate 14 or a stainless steel plate 14 which is subjected to plating treatment to the cover resin 13.

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 on a seat of an automobile or the like, for example, in an emergency.

[0002]

2. Description of the Related Art Conventionally, as a seat belt device for restraining an occupant or the like of a vehicle to a seat, there is a three-point seat belt device using continuous webbing.

Referring to FIG. 17, a seat belt device 2 is shown.
In 10, the webbing 211 has one end portion wound around the retractor 212 so as to be able to be pulled out, and the other end portion of the webbing 211 is attached to an anchor plate 214 pivotally supported by a lower portion of the center pillar 213. Locked via 215. The webbing 211 is
The slut 216 provided between the anchor plate 214 and the through anchor 215 is attached to the seat 2 of the vehicle body.
17 is engaged with a buckle 218 standing upright. Thus, the webbing 211 restrains the occupant (not shown) to the seat 217.

In the seat belt device 210, as a webbing guide for guiding the webbing 211, in addition to the through anchor 215 and the sluting 216, a through belt (not shown), a webbing guide at the outlet of the retractor, and the like are provided. Each of the webbing guides is provided with an elongated belt slot, and the belt slot slides and guides the inserted webbing 211.

[0005]

In order to ensure a good winding property of the webbing 211 and a good operation feeling when the webbing 211 is pulled out, it is necessary to reduce the frictional resistance at the sliding contact between the belt slot and the webbing 211. It is necessary to keep it as low as possible. Therefore, a surface treatment is performed by smoothing the surface shape with a coating resin or applying a fluorine-based paint having good friction resistance.

[0006] Among the webbing guides, through anchor 2
15 can be constituted, for example, by molding a coating resin on an insert fitting. The through anchor 215 must bear the load during a vehicle collision. For this reason, the coating resin is required to have sufficient mechanical strength so as not to be deformed when a load is applied.

In a through anchor formed by molding a coating resin onto an insert, the frictional resistance between the through anchor and the webbing increases during repeated use by the user in the market, depending on the molding material. When the webbing is not attached (when the slut is removed), the webbing is completely wound around the winding device. There was a possibility that a problem such as not taking it would occur.

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 apparatus which can maintain good sliding contact between a webbing guide and a webbing while having a simple structure.

[0009]

The object of the present invention is to provide a seat belt apparatus comprising: a webbing for restraining an occupant's body to a seat; and a webbing guide for slidingly contacting the webbing and guiding the webbing. The webbing guide is formed by molding a coating resin on an insert metal fitting, and further wrapping a metal plate around a portion that comes into sliding contact with the webbing. At least a part of the portion that comes into sliding contact with the webbing is made of a plated metal surface or stainless steel. This is achieved by providing a seat belt device characterized by being a metal surface.

According to the above configuration of the present invention, the webbing guided in sliding contact with the webbing guide restrains the occupant's body to the seat. At least a part of the portion of the webbing guide that comes into sliding contact with the webbing is a metal surface or a stainless steel metal surface whose surface has been subjected to plating treatment, adhesion of dust is suppressed, and there is little aging deterioration in the sliding contact with the webbing. , Good sliding properties can be maintained.

Here, as the metal surface to be plated, a metal plate having a separately plated surface can be wound around a coating resin to make this portion a metal surface which is in sliding contact with the webbing. The portion may be exposed from the coating resin, and a plating process may be performed on this portion (or the entire insert fitting) to form a metal surface that is in sliding contact with the webbing.

The plating is preferably any of chromium, nickel, electroless, cobalt, tin-cobalt, and hard chrome, but any other plating may be used as long as the adhesion of dust is suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a front view showing a through anchor of the seat belt device according to the first embodiment of the present invention, and FIG. 2 is a sectional view of the through anchor of FIG.

[0014] In the seat belt device, the webbing is wound at one end so as to be able to be pulled out by a retractor, and the other end is attached to an anchor plate which is pivotally supported at a lower portion of a center pillar of the vehicle by a webbing guide. It is locked via a certain through anchor. The webbing restrains the occupant to the seat by engaging a slut provided between the anchor plate and the through anchor with a buckle erected near the seat in the vehicle body.

Referring to FIGS. 1 and 2, the through anchor 10 is formed by integrally molding a coating resin 13 with an insert fitting 11 formed by processing a single metal plate into a required shape.

A bolt fitting hole 16 for fitting a bolt (not shown) for rotatably supporting the through anchor 10 on the center pillar is formed in an upper portion of the insert fitting 11 in the drawing. The insert fitting 11 is formed in a required shape by, for example, punching a metal plate such as a steel plate, and secures the load bearing performance of the through anchor 10. The material of the insert fitting 11 is, for example, a carbon steel material (JIS) having a predetermined thickness so as to withstand a predetermined load.
SC material). Further, the insert metal fitting may be subjected to a heat treatment so as to withstand a predetermined load.

The coating resin 13 is molded around the insert fitting 11 into a required shape. The coating resin 13 is made of a resin having high mechanical strength. Specific examples of the coating resin 13 include a polyamide-based resin such as polyamide 6, a resin obtained by adding a reinforcing agent to polyacetal and polypropylene, and a polycarbonate.

A thin metal plate 14 made of, for example, stainless steel, an iron-based material, an aluminum alloy, a titanium alloy or the like capable of withstanding a predetermined load is bent and wound around the coating resin 13 so as to be wound. Forms a sliding contact surface 15 with the webbing (hereinafter referred to as "webbing sliding contact surface 15"). The surface of the metal plate 14 is plated to suppress adhesion of dust and maintain good slidability. When the metal plate 14 is a stainless steel plate, it is not necessary to perform the plating process. As the plating, any of chrome, nickel, electroless, cobalt, tin cobalt, and hard chrome is preferable. Also,
Both ends 14 of metal plate 14 wound around coating resin 13
a (lower end in FIG. 2) is spot-welded (weld portion is 14b
) And covered with a resin cover 17 to improve the appearance. The cover 17 is provided on the metal plate 14.
The inner surface is locked by the top of a triangular claw portion 14c formed by cutting and raising the metal plate 14 so as to be held by the metal plate 14.

Next, the operation of the present embodiment will be described. In the seat belt device, the webbing for restraining the occupant to the seat is inserted into the webbing insertion gap L of the through anchor 10 and is guided by the through anchor 10 by sliding contact with the webbing sliding contact surface 15. The through anchor 10 guides the webbing in sliding contact with the webbing sliding contact surface 15 with excellent sliding properties. Since the webbing sliding contact surface 15 is a plated metal surface or a stainless metal surface, there is little adhesion of dust, and good sliding contact can be maintained as will be clear from the examples described later.

FIG. 3 is a front view showing a through anchor of the seat belt device according to the second embodiment of the present invention.
FIG. 4 is a cross-sectional view of the through anchor shown in FIG.

In this embodiment, after a coating resin 23 is molded on the insert fitting 11 of the through anchor 20, a metal plate 24 is bent around the coating resin 23, and the elastic force of the metal plate 24 is used. The webbing sliding contact surface 15 is formed on a part of the surface of the metal plate 24. The material and surface treatment of the metal plate 24 are the same as in the first embodiment. Other configurations and operations are
This is almost the same as the first embodiment.

FIG. 5 is a front view showing a through anchor of a seat belt device according to a third embodiment of the present invention.
FIG. 6A is a cross-sectional view of the through anchor of FIG.
(B) is a side view of the through anchor of FIG. 5, and FIG. 7 is a perspective view of the metal plate of the through anchor shown in FIG.

The through anchor 30 of this embodiment has substantially the same structure as that of the second embodiment described above, and the coating resin 33 of the through anchor 30 is provided with a metal plate 34 as shown in FIG.
Is inserted from the right side in FIG. That is, the end 34a of the metal plate 34 is inserted into the groove 33a formed in a part of the coating resin 33, and then the metal plate 34
5 and 6 until the webbing sliding contact surface 15 is at the top in FIGS. The material of the metal plate, surface treatment, and other configurations and operations are substantially the same as those in the first embodiment.

FIG. 8 is a front view showing a through anchor of a seat belt device according to a fourth embodiment of the present invention.
FIG. 9 is a cross-sectional view of the through anchor shown in FIG.

In this embodiment, after the coating resin 43 is molded on the insert fitting 11 of the through anchor 40, the metal plate 44 is bent around the coating resin 43, and the elastic force of the metal plate 44 is used. The webbing sliding contact surface 15 is formed on a part of the surface of the metal plate 44. Further, both ends 44a (the lower end in FIG. 9) of the metal plate 44 are covered with a cover 47 made of resin. The cover 47 is held by engaging the claw portion 47 a on the inside thereof with the concave portion of the coating resin 43. The material of the metal plate, surface treatment, and other configurations and operations are substantially the same as those in the first embodiment. In the fourth embodiment, the metal plate assembling method shown in the third embodiment may be adopted.

FIG. 10 is a partial front view showing a through anchor of a seat belt device according to a fifth embodiment of the present invention, and FIG. 11 is a sectional view of the through anchor in FIG.

In the present embodiment, after the coating resin 53 is molded on the insert fitting 11 of the through anchor 50, the metal plate 54 is curved around the coating resin 53 and wound around the resin, thereby forming a partial surface of the metal plate 54. To form the webbing sliding contact surface 15. Also, both ends 54a of the metal plate 54
The lower end in FIG. 11 is covered with a resin cover 57. The cover 57 has a substantially E-shaped cross section, and is held by inserting the concave portion of the cover 57 into both ends 54a of the metal plate 54 from the left side in FIG. The material of the metal plate, surface treatment, and other configurations and operations are substantially the same as those in the first embodiment.

In the fifth embodiment described above,
As shown in FIG. 12, the webbing sliding contact surface 15 side of the metal plate 54 is desirably a so-called sag surface side formed at the time of press working (surface opposite to the side where the burr 54b comes out). This prevents burrs from being formed on the webbing sliding contact surface 15 and prevents the webbing from being damaged. This can of course be applied to other embodiments.

FIG. 13 is a partial front view showing a through anchor of a seat belt device according to a sixth embodiment of the present invention, and FIG. 14 is a sectional view of the through anchor of FIG.

In the present embodiment, after the coating resin 63 is molded on the insert fitting 11 of the through anchor 60, a metal plate 64 is bent around the coating resin 63 and wound, thereby forming a partial surface of the metal plate 64. To form the webbing sliding contact surface 15. Also, both ends 64a of the metal plate 64
The lower end in FIG. 14 is covered with a cover 67 made of resin. The cover 67 is held by its claws 67 a being locked to both ends 64 a of the metal plate 64. The material of the metal plate, surface treatment, and other configurations and operations are substantially the same as those in the first embodiment.

As described above, according to each of the above embodiments, the through anchors 10, 20, 30, and
Reference numerals 40, 50, and 60 denote a coating resin 1 for the insert fitting 11.
3, 23, 33, 43, 53, 63 are formed by molding, and at least a part of the surface that comes into sliding contact with the webbing is a plated metal surface or a stainless metal surface.

That is, according to the first to sixth embodiments, the through anchors 10, 20, 30, 40, 50, 60
Coating resin 13, 23, 33, 4
After molding 3,53,63, the coating resin 13,2
3, 33, 43, 53, 63, a metal plate or a stainless plate 1 made of, for example, an iron-based material with a plated surface.
4, 24, 34, 44, 54 and 64 were wound to form the webbing sliding contact surface 15 on the plated surface of the metal plate 14, 24, 34, 44, 54 and 64 or the stainless steel surface. Therefore, in each of the embodiments, the through anchors 10, 20, 30, 40, 50, and 60 can be reduced in cost with a simple structure.
The slidability between the webbing and the webbing is less deteriorated with time, and excellent slidability can be maintained.

It should be noted that the present invention is not limited to the above-described embodiment, but can be appropriately changed and improved. For example, as the metal surface to be plated,
As in the sixth embodiment, a metal plate whose surface is separately plated is wrapped around a coating resin to form a metal surface that is in sliding contact with the webbing, and a part of the insert metal fitting is exposed from the coating resin. The entire metal fitting may be subjected to a plating process to provide a metal surface that is in sliding contact with the webbing.

[0034]

[Embodiment] Next, the effect of preventing deterioration with time by applying a plating process will be described below. FIG. 15 shows a schematic side view of a storage margin tester for measuring the storage margin (power to wind up the webbing) of various through anchors (A to C described later). First, the configuration of the storage margin test apparatus used in this experiment will be described.

As shown in FIG. 15, in the storage margin tester 70, the webbing W of the seat belt device held on the seat belt holding pedestal 71 is moved by the operation of the webbing take-out and take-up air cylinder 73. The operation of pulling out and retracting from the retractor 72 is repeated.

The seat belt holding base 71 is provided with a base 82.
The retractor 72, the retractor 72, the through anchor 74, the simulated shoulder member 77, and the webbing W of the seat belt device are held at substantially the same positions as when mounted on the vehicle.
That is, the seat belt holding frame 71 is located at the base end (FIG. 1).
5) a retractor 72 around which the webbing W is wound in the vicinity of the webbing W; a through anchor 74 in which the webbing W is inserted near the upper end in FIG. 11 at a predetermined vertical distance from the retractor 72; The dummy shoulder member 77 provided near the through anchor 74 is supported.

The webbing pull-out and take-up air cylinder 7
Numeral 3 is supported by an air cylinder support base 84 in a predetermined posture, and fixes the webbing W to a mounting plate 75 fixed to the cylinder rod 73a via a hanger member or the like. The air cylinder support gantry 84 is fixed on the base 82 with a predetermined positional relationship with the seat belt support gantry 71.

Air cylinder 73 for webbing pull-out winding
With the retraction of the cylinder rod 73a from the cylinder body 73b, the webbing W in the substantially same state as the non-use state is pulled out by a predetermined amount a from the retractor 72 until the state is substantially the same as the occupant restraint state, The drawn-out webbing W is again taken up by the retractor 72 to a state substantially the same as the non-use state, that is, a predetermined amount a. In the present embodiment, the predetermined amount a is set to 500 mm.

The simulated shoulder member 77 has a radius of curvature of about 5
The mounting position is set so that its center is offset from the through anchor 74 by a predetermined amount c. In this embodiment, the predetermined amount c is set to 200 mm. The surface of the simulated shoulder member 77 is covered with a polyester cloth, and after confirming whether or not the top end of the polyester cloth has hit the webbing W, the simulated shoulder member 77 is pressed against the webbing W of about 10 mm in the present embodiment and installed. ing.

The retractor 72 has a through anchor 7
A predetermined amount d vertically below 4, approximately 690 mm in this embodiment.
It is located below. The angle formed by the webbing W via the through anchor 74 is f in side view, 70 ° in this embodiment, and is set to 45 ° in top view.

A wrap outer 78 is provided vertically below the through anchor 74 by a predetermined amount e, approximately 780 mm below in this embodiment. The wrap outer 78 is used when the webbing W attached to the webbing pull-out and take-up air cylinder 73 is removed, the webbing W is attached to the wrap outer 78, and the weight is lowered on the webbing W to measure the storage margin force. You.

In this embodiment, an artificial sebum solution is applied as a sample having a similar tendency to that which has actually deteriorated with time. As the artificial sebum liquid, various known liquids can be used. For example, in this embodiment, oleic acid and protein are used as organic components, and mud is used as an inorganic component.

A predetermined amount of the artificial sebum liquid having such a formulation is applied to the surface of the simulated shoulder member 77 once every 100 times of drawing-in and rolling-in (to be once withdrawing-involving). The experiment was performed by attaching a weight of 5 g unit to the webbing W of the wrap outer 78 to which the webbing W was attached every predetermined number of operations. In this embodiment,
The weight of this weight is defined as the storage margin force (gf).

Hereinafter, the experimental results are shown in Table 1, and a graph plotting Table 1 is shown in FIG. Table 1 and FIG.
, A through anchor A is a conventional product in which a coating resin is applied to an insert fitting (Comparative Example 1), and a through anchor B is S
The US plate is wound around the coating resin (Example 1), and the through anchor C is a chrome-plated steel plate wound around the coating resin (Example 2). In addition, about the winding method of the metal plate in Examples 1 and 2, any of the winding methods in the above-described first to sixth embodiments may be adopted.

[0045]

[Table 1]

As is apparent from Table 1 and FIG. 16, the through anchor A has a relatively large initial storage margin, but has a very large deterioration with time. On the other hand, the through anchors B and C, which are the objects of the present invention, hardly deteriorate at the time of diameter, and particularly, those provided with chrome plating (through anchor C) have a stable storage margin and maintain a constant value. It turned out to be.

[0047]

As described above, according to the present invention, at least a part of the portion of the webbing guide that comes into sliding contact with the webbing is a plated metal surface or a stainless metal surface. Therefore, it is possible to maintain good sliding contact between the webbing guide and the webbing while reducing costs with a simple structure.

[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 sectional view of the through anchor shown in FIG.

FIG. 3 is a front view showing a through anchor of a seat belt device according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the through anchor shown in FIG.

FIG. 5 is a front view showing a through anchor of a seat belt device according to a third embodiment of the present invention.

6A is a cross-sectional view of the through anchor shown in FIG. 5 as viewed from the direction indicated by an arrow B. FIG. 6B is a side view of the through anchor shown in FIG.

FIG. 7 is a perspective view of a metal plate of the through anchor shown in FIG. 5;

FIG. 8 is a front view showing a through anchor of a seat belt device according to a fourth embodiment of the present invention.

9 is a sectional view of the through anchor of FIG.

FIG. 10 is a partial front view showing a through anchor of a seat belt device according to a fifth embodiment of the present invention.

11 is a sectional view of the through anchor of FIG.

FIG. 12 is a side view of a metal plate.

FIG. 13 is a partial front view showing a through anchor of a seat belt device according to a sixth embodiment of the present invention.

14 is a sectional view of the through anchor of FIG.

FIG. 15 is a schematic side view of a storage margin test apparatus.

FIG. 16 is a graph in which Table 1 is plotted.

FIG. 17 is a perspective view showing a conventional seat belt device.

[Explanation of symbols]

 10, 20, 30, 40, 50, 60 Through anchor 11 Insert fitting 13, 23, 33, 43, 53, 63 Coating resin 14, 24, 34, 44, 54, 64 Metal plate 15 A portion that slides on webbing (webbing) Sliding surface)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiji Suzuki 12 Kirihara-cho, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 3D018 CA09 CB02

Claims (1)

[Claims] 1. A seatbelt device comprising: a webbing for restraining an occupant's body to a seat; and a webbing guide for slidingly contacting the webbing and guiding the webbing, wherein the webbing guide is formed by molding a coating resin into an insert fitting. A seat belt formed by molding and further wrapping a metal plate around a portion that is in sliding contact with the webbing, wherein at least a part of the portion that is in sliding contact with the webbing is a plated metal surface or a stainless metal surface. apparatus.