JPH09290706A - Slip guide - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: The sliding property of the webbing is kept good to improve the operability at the time of wearing the seat belt, and the resin coating material is prevented from cracking due to a change in the environmental temperature, and the durability is excellent. Provide a simple slip guide. A through anchor (13) includes a metal insert fitting (1) and a resin coating material (2) integrated with a main part of the insert fitting (1) by molding. In the webbing guide portion 4 of the insert metal fitting 1, a plurality of through holes 5 for suppressing the displacement of the resin coating material 2 with respect to the surface of the insert metal fitting 1 caused by a difference in coefficient of thermal expansion during punching are dispersedly arranged. It is drilled in the state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a slip guide used for guiding a webbing in a predetermined direction / position.

[0002]

2. Description of the Related Art Conventionally, as a seat belt device for holding a vehicle occupant or the like safely in a seat, there is a three-point seat belt device using continuous webbing. In this type of seat belt device, as shown in FIG. 9, one end portion of the webbing 10 is locked to the anchor plate 27, and the other end portion is disposed at the lower end portion of the center pillar 22 through the through anchor 21. Retractor (winding device)
20 is engaged with a buckle 25 which is erected in the center of the vehicle body by engaging a slanging 24, which is disposed in the middle portion of the webbing between the anchor plate 27 and the through anchor 21, with a buckle 25 erected in the center of the vehicle body. Are bound to.

[0003] In addition to the through-anchor 21 and the sluting 24, the three-point seat belt device has a belt guide, a through-belt (not shown), or a retractor outlet at the outlet of the retractor. Webbing 10 like webbing guide
A large number of slip guides are provided for guiding the slips in a predetermined direction / position.

A webbing 1 is used for such a slip guide.
A webbing insertion slot for guiding 0 is provided, and the webbing 10 inserted in the webbing insertion slot directly contacts and slides. Therefore, in order to improve the winding performance when winding the webbing and the operation feeling when pulling out the webbing, it is necessary to suppress the frictional resistance at least in the contact portion of the slip guide with the webbing as low as possible. The material has a smooth surface shape or surface treatment. Further, some of the slip guides have to bear a load in the event of a vehicle collision, and are required to have sufficient mechanical strength so as not to be deformed when a load is applied.

Therefore, a through anchor 30 as shown in FIG. 10, for example, is known. This through anchor 30 is
Metal insert fitting 31 and the insert fitting 31
Resin coating material 3 integrated with the main part of the mold by molding
2 is a slip guide provided with. The insert fitting 31 has an annular webbing guide portion 34 that forms a webbing insertion slot 33 into which the webbing 10 is inserted.
And the vehicle body mounting portion 3 mounted on the center pillar 22
6 and 6 are integrally punched out from a metal plate to have an outer shell shape. The insert fitting 31 plays a role of ensuring load bearing performance, and the plate thickness and the like are selected so as to withstand a predetermined load.

On the other hand, the resin coating material 32 covers at least the edge of the webbing insertion slot 33 so as to cover the edge of the webbing insertion slot 33.
The surface of No. 4 is molded with a synthetic resin having a small friction coefficient, and plays a role of improving slippage of the webbing 10 in the webbing insertion slot 33.

[0007]

However, in order to improve the durability of the through anchor 30 as described above against the environmental temperature change and to make the through anchor 30 correspond to any use condition that may occur in the actual use state, a low temperature atmosphere is used. (Usually -30 ° C to -40 ° C) and high temperature atmosphere (usually 8
When the through anchor 30 was repeatedly exposed to a heat cycle between 0 ° C. and 100 ° C., the resin coating material 32 sometimes cracked depending on the shape of the molded portion.

The cause of the cracks may be various factors such as molding strain at the time of molding, weld line of molten resin and entrainment of dissimilar material. The main cause is stress fatigue due to excessive tensile cyclic stress. it is conceivable that. That is, generally, the linear expansion coefficient of the steel material used for the insert fitting is about 1.16 × 10 ⁻⁵ , whereas the linear expansion coefficient of the unreinforced general-purpose engineering resin used for the resin coating material is about 1.16 × 10 ^−5. Since it is 9 × 10 ⁻⁵ , the thermal expansion coefficient of the resin coating material is about 8 times that of the insert fitting. Therefore, at the time of thermal expansion / contraction, such a difference in the coefficient of thermal expansion between the insert fitting and the resin coating material causes tensile stress in the resin coating material in both high temperature and low temperature environments.

In the case of the above-mentioned through anchor 30,
The resin coating material 32 is formed by molding a relatively smooth surface of the webbing guide portion 34 with a synthetic resin having a small friction coefficient. Therefore, the through anchor 30
A stress concentration due to the tensile stress occurs in the volumetrically constricted portion A, the bent portion B, and the like, and cracks may occur due to repeated excessive tensile stress under the thermal cycle as described above.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, and to improve the operability when the seat belt is worn by keeping the sliding of the webbing good and to cause the cracking of the resin coating material due to the environmental temperature change. And to provide a good slip guide having excellent durability.

[0011]

The above object of the present invention comprises an insert metal fitting forming a webbing insertion slot through which a webbing is inserted, and a resin coating material covering at least a webbing contact portion of the webbing insertion slot. In a slip guide for guiding the resin in a predetermined direction / position, the insert metal fitting is provided with an engagement means for suppressing the displacement of the resin coating material with respect to the surface of the insert metal fitting caused by a difference in coefficient of thermal expansion. Is achieved by the slip guide.

Preferably, the engaging means is composed of at least one of a plurality of through-holes provided in the insert fitting, projections formed by doweling or shading.
Further, preferably, the engaging means is constituted by a concave-convex portion of an insert metal fitting which is pressed into a corrugated cross section. According to the above configuration of the present invention, even if the resin coating material of the slip guide tries to expand or contract due to a change in environmental temperature, the change is restrained or prevented by the engaging means of the insert fitting, and the change is caused. The amount can be reduced. That is, the insert fitting provided with the engaging means plays a role of a reinforcing material for the resin coating material, and as a result, the coefficient of thermal expansion of the resin coating material portion becomes small, and the dimensional change of the resin coating material is suppressed. To be done.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A slip guide according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
A through anchor 13 according to one embodiment of the present invention shown in FIGS. 1 to 3 includes a metal insert metal fitting 1 and a resin coating material 2 integrated with a main part of the insert metal fitting 1 by molding. It is a slip guide equipped.

As shown in FIG. 2, the insert metal fitting 1 is rotatably attached to the center pillar 35 by an annular webbing guide portion 4 forming a webbing insertion slot 3 into which the webbing 10 is inserted and a male screw member 38. The outer shape is adjusted by punching the body mounting portion 6 to be formed integrally with the metal plate. The insert metal fitting 1 plays a role of ensuring load bearing performance. For example, a carbon steel material (JIS SC material) is selected as a material and a plate thickness and the like are selected so as to withstand a predetermined load. It

Further, the webbing guide portion 4 of the insert metal fitting 1 serves as an engaging means for suppressing the displacement of the resin coating material 2 with respect to the surface of the insert metal fitting 1 caused by a difference in coefficient of thermal expansion during punching. Through hole 5
However, a plurality of them are perforated in a dispersed arrangement state. The through hole 5 is a simple circular through hole as shown in FIG. 3, but the shape of the hole is not limited to this, and various shapes can be adopted. Further, these through holes 5 can also be formed by machining after pressing the insert fitting 1.

On the other hand, the resin coating material 2 is molded on the webbing guide portion 4 of the insert metal fitting 1 which has been molded so as to cover at least the edge of the webbing insertion slot 3, for example, polyamide resin as a synthetic resin having a small friction coefficient. It is molded and plays a role of improving slippage of the webbing in the webbing insertion slot 3.

That is, at the time of molding, a part of the molten resin filled around the webbing guide portion 4 fills the through hole 5 formed in the webbing guide portion 4, and after solidification, it is kept at ambient temperature. Webbing guide part 4 depending on
It plays a role of restraining the change of the resin coating material 2 which tends to expand and contract. Therefore, as shown in FIG. 2, the through holes 5 are arranged so that the columnar portions 8 made of resin are strong enough to withstand the shear stress caused by the difference in the coefficient of thermal expansion. The diameter (for example, about twice the plate thickness) is set.

In other words, the through anchor 13 has a metal insert metal fitting 1 having a high mechanical strength for load resistance against a collision and the like, and the webbing slidability in the webbing guide portion 4 has a friction coefficient higher than that of a metal material. The resin coating material 2 made of resin having a small size can be shared. Therefore, it is possible to maintain good sliding of the webbing in the webbing guide portion 4 to improve operability when the seat belt is worn, and at the same time, to ensure load resistance against a collision or the like.

Further, even if the resin coating material 2 of the through anchor 13 tries to expand or contract due to a change in environmental temperature,
The change is restrained by the columnar portion 8 of the resin filled in the through hole 5 of the insert fitting 1 to reduce the change amount. That is, the insert metal fitting 1 having the through hole 5 is
The resin coating material 2 plays a role of a reinforcing material, and as a result, the coefficient of thermal expansion of the resin coating material portion becomes small, and the dimensional change of the resin coating material 2 is suppressed.

Therefore, even if the thermal expansion and contraction are repeated due to the change of the environmental temperature, the excessive tensile repetitive stress is not concentrated on the volumetrically constricted portion and the bent portion of the resin coating material 2. And can exhibit excellent heat cycle durability. The engagement means of the present invention provided in the webbing guide portion 4 in order to prevent the displacement of the resin coating material 2 with respect to the surface of the insert fitting 1 caused by the difference in the coefficient of thermal expansion is the number of the through holes 5 equipped. The structure is not limited to this.

For example, as shown in FIG. 4, as the engaging means provided in the webbing guide portion 4, a protrusion having a plurality of dowels 9 protruding from the webbing guide portion 4 is formed by processing a dowel protrusion having a circular cross section. It is also possible to form a part. In this case, when the resin coating material 2 molded around the webbing guide portion 4 tries to expand or contract with respect to the webbing guide portion 4 due to a change in environmental temperature, the dowel 9 becomes a direct obstacle. Prevent the change. Therefore, the resin coating material 2 has a small coefficient of thermal expansion, and the dimensional change is suppressed.

Further, as shown in FIG. 5, as the engaging means provided on the webbing guide portion 4, a projection having a plurality of dowels 11 protruding from the webbing guide portion 4 is formed by processing a dowel projection having a rectangular cross section. It is also possible to form a part. In this case, if the direction of the side surface of the dowel 11 is set so that the effect of suppressing the dimensional change of the resin toward the volumetrically constricted portion or the bent portion of the resin coating material 2 is great, an even better thermal cycle can be obtained. It can exhibit durability.

FIG. 6 is a cross-sectional view of an essential part of an insert fitting in which scraping is performed as engaging means provided on the webbing guide portion 4 and a plurality of projections 12 are formed on the webbing guide portion 4 by scraping. . Even in this case, if the direction of the side surface 12a of the protrusion 12 is set so that the effect of suppressing the dimensional change of the resin toward the volume-restricted portion or the bent portion of the resin coating material 2 is large,
Further, excellent heat cycle durability can be exhibited.

Further, as shown in FIGS. 7 and 8, as the engaging means provided on the webbing guide portion 4, the webbing guide portion 4 is pressed into a corrugated cross section to form an uneven portion 15.
May be formed. In this case, as described above, the resin coating material 2
Not only can the thermal cycle durability of the insert be improved, but the mechanical strength of the insert fitting can be improved by pressing the webbing guide portion 4 into a corrugated cross section, and as a result, the insert fitting can be made thinner. .

Further, the slip guide of the present invention is not limited to the through anchor shown in the above-mentioned embodiment, but can be applied to various slip guides used in seat belt devices for guiding the webbing in a predetermined direction and position. Of course, you can

[0026]

According to the slip guide of the present invention, the sliding of the webbing can be kept good to improve the operability when the seat belt is worn, and at the same time, the load resistance against a collision can be secured. Further, even if the resin coating material of the slip guide tries to expand or contract due to the change of the ambient temperature, the change is restrained or prevented by the engaging means of the insert fitting, and the change amount is reduced. That is, the insert fitting provided with the engaging means plays a role of a reinforcing material for the resin coating material, and as a result, the coefficient of thermal expansion of the resin coating material portion becomes small, and the dimensional change of the resin coating material is suppressed. To be done.

Therefore, even if repeated thermal expansion and contraction due to changes in environmental temperature occur, excessive tensile repetitive stress concentration does not occur at the volumetrically constricted portions and bent portions of the resin coating material. , Can exhibit excellent heat cycle durability. Therefore, it is possible to provide a good slip guide having excellent durability by preventing the resin coating material from cracking due to a change in environmental temperature while improving the operability when the seat belt is worn by keeping the webbing slippery.

[Brief description of drawings]

FIG. 1 is a front view of a through anchor according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a usage state of the through anchor shown in FIG.

FIG. 3 is a front view showing the form of the insert fitting shown in FIG. 1 immediately after punching.

4 (a) is an enlarged cross-sectional view of a main part of the webbing guide portion shown in FIG. 3, and FIG. 4 (b) is an arrow view in the E direction in FIG. 4 (a).

5A is an enlarged cross-sectional view of a main part showing a modified example of the webbing guide portion, and FIG. 5B is a view taken in the direction of the arrow F in FIG.

FIG. 6 is an enlarged sectional view of an essential part showing a modified example of the webbing guide part.

FIG. 7 is a front view of an insert fitting showing a modified example of the webbing guide portion.

8 is a cross-sectional view taken along the line GG in FIG.

FIG. 9 is a perspective view showing a schematic configuration of a seat belt device in which the slip guide of the present invention is used.

FIG. 10 is a front view of a conventional through anchor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert metal fitting 2 Resin coating material 3 Webbing insertion slot 4 Webbing guide part 5 Through hole 6 Car body mounting part 8 Columnar part 9 Dowel 11 Dowel 12 Projection part 13 Through anchor 15 Uneven part

Claims (1)

[Claims] 1. A guide for guiding a webbing in a predetermined direction / position, comprising: an insert fitting that forms a webbing insertion slot through which the webbing is inserted; and a resin coating material that covers at least a webbing contact portion of the webbing insertion slot. In the slip guide, the insert metal fitting is provided with an engagement means for suppressing the displacement of the resin coating material with respect to the surface of the insert metal fitting caused by the difference in coefficient of thermal expansion.