JP4651872B2 - Seat belt device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat belt device that restrains the body of an occupant seated on a seat of an automobile or the like, and more particularly, to a structure for preventing a so-called jamming phenomenon in which a webbing slides and slides in a webbing insertion hole of a webbing guide.
[0002]
[Prior art]
Conventionally, as a seat belt device, there is a three-point seat belt device using continuous webbing. As shown in FIG. 11, in the three-point seat belt device 100, the webbing 101 is wound around one end of the retractor 102 so that it can be pulled out. The other end of the webbing 101 is inserted through a through anchor 105 supported by the center pillar 103 so as to be positioned in the vicinity of the shoulder of the occupant 109, inserted through the sluting 106, and fixed to the anchor plate 104 fixed to the lower portion of the center pillar 103. It is locked. By engaging the sluting 106 with the buckle 108 disposed in the vicinity of the seat 107, the occupant 109 can be restrained to the seat 107 by the webbing 101. At this time, the webbing 101 is guided upward along the center pillar 103 from the retractor 102 on one side (the back 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 vehicle front side. (Left side in the drawing) and the other side (front side in the drawing) of the sheet 107 are guided.
[0003]
The seat belt device 100 is provided with various types of webbing guides for guiding the webbing 101 in addition to the through anchor 105 and the sluting 106. Each of these webbing guides is provided with a long hole webbing insertion hole. The webbing 101 is inserted into the webbing insertion hole and guided in sliding contact.
[0004]
There is a type of webbing guide in which an iron plate curved in a C shape is crimped on the edge of the webbing insertion hole. The iron plate surface is smooth and is electrodeposited or metal plated. They are also made of stainless steel and used without surface treatment. In this type of webbing guide, since the webbing contact portion is a metal surface, there is little surface contamination of the webbing contact portion, and the winding property and the like are hardly deteriorated.
However, in this type, when a great load is applied to the webbing in the event of a vehicle emergency such as a collision, a so-called jamming phenomenon may occur in which the webbing is offset due to skidding in the webbing insertion hole. This is partly because the friction coefficient of the metal surface of the webbing guide with respect to the webbing is low.
[0005]
Conventional products also use a webbing guide in which the webbing contact portion around the webbing insertion hole has a resin surface such as nylon. In this type of webbing guide, the jamming phenomenon is suppressed because the webbing and the resin surface are melted by frictional heat between the webbing and the resin surface in a vehicle emergency.
[0006]
[Problems to be solved by the invention]
As mentioned above, if the webbing guide's webbing contact part is made of a resin surface, jamming can be suppressed. However, in order to ensure good winding performance of the webbing and good operation feeling when pulling out the webbing, It is also desirable that the contact portion be a metal surface.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a seat belt device capable of preventing a jamming phenomenon while ensuring good slidability of webbing in a webbing guide.
[0007]
[Means for Solving the Problems]
The object of the present invention is to provide a seat including a webbing for restraining the body of an occupant to the seat, and a webbing guide having an elongated webbing insertion hole through which the webbing is inserted and a part of the inner surface thereof contacts the webbing. In the belt device, at least a part of a contact portion of the webbing guide with the webbing is made of metal, and a groove having a depth of 0.1 to 0.5 mm into which the warp yarn of the webbing enters the metal surface. Fine irregularities including concave portions are formed, and the concave portions are formed by grooves extending linearly in a direction orthogonal to the width direction of the webbing, and the interval between the grooves is 0.5 to 2 mm. Achieved by a seat belt device .
[0008]
According to the seat belt device as described above, part or all of the webbing contact portion in the webbing guide is made of a metal surface, so that it is possible to obtain a good webbing rewinding property and a good operational feeling when the webbing is pulled out. . When a high load acts on the webbing , the webbing warp thread enters a groove provided on the metal surface, thereby suppressing the side slip of the webbing. Therefore, it is possible to reliably prevent the jamming phenomenon while ensuring good slidability of the webbing in the webbing guide.
Further, since the webbing contact portion is made of a metal surface, the mechanical strength of the webbing guide is high, and it can sufficiently withstand a high load acting on the webbing guide in the event of a vehicle emergency such as a collision.
[0009]
Preferably, the roughness of the metal surface provided with the unevenness can be 10 to 200 μm in the center line average roughness (Ra) and 15 to 300 μm in the maximum height (Rmax). The irregularities are preferably fine enough to allow the webbing yarn to be in close contact. It is also preferable to arrange grooves having an eye spacing of about 0.5 to 2 mm.
Examples of the metal material include carbon steel, low carbon steel, stainless steel, high carbon steel, and the like.
The unevenness can be provided on the entire metal surface, but is not particularly limited thereto, and may be provided on a part of the metal surface. For example, when the metal surface is a curved surface and has a substantially arc shape in a longitudinal sectional view, the top of the arc is regarded as a webbing folding position, and the uneven region is formed on one side with respect to the top having a larger webbing sliding contact area than the other side with respect to the top. May be provided.
[0010]
Further, the above object of the present invention comprises grooves on the surface of the metal at a depth of 0.1 to 0.5 mm and intervals of 0.5 to 2 mm when viewed in the width direction of the webbing in contact with the metal surface. A rough surface portion having fine irregularities including a concave portion, a surface having a height equivalent to the height of the convex portion in the rough surface portion, or a surface having a height equivalent to the height of the bottom surface of the concave portion in the rough surface portion, and It is achieved by a seat belt device characterized in that an edge that allows biting of the webbing against side slip is formed at a boundary between the smooth portion and the rough surface portion by providing a smooth portion having no irregularities. .
The smooth portion preferably extends in a direction inclined with respect to a direction orthogonal to the width direction.
The rough surface portion is constituted by a groove provided symmetrically with respect to the center of the metal in the width direction, and the groove extends in a direction inclined with respect to a direction orthogonal to the width direction. It is preferable that the extending direction of the groove is different on one side and the other side with respect to the center.
The smooth portion is preferably formed in a band shape having a width of 2 mm or more. Moreover, it is preferable that a plurality of the smooth portions are formed. It is preferable that a direction in which the fine groove extends and a direction in which the smooth portion extends are parallel. A first rough surface portion is formed by providing a plurality of fine grooves extending in parallel on the metal surface, and a second rough surface is provided by providing a plurality of fine grooves extending in a direction different from the grooves of the first rough surface portion. It is preferable that a surface portion is formed, and a strip-shaped smooth portion having a width of 2 mm or more is formed at the boundary between the first rough surface portion and the second rough surface portion.
[0011]
According to the seat belt device as described above, a significant webbing skid prevention effect can be obtained at the boundary between the rough surface portion and the smooth portion of the metal surface. The rough surface portion, the smooth portion, or the boundary between them does not deteriorate the webbing winding property and the drawing property. Therefore, it is possible to reliably prevent the jamming phenomenon while ensuring good slidability of the webbing in the webbing guide.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a through anchor used in the seat belt apparatus according to the first embodiment of the present invention. As shown in FIG. 1, the through anchor 10 is configured by integrating a coating resin 13 by molding at a predetermined portion of an insert fitting 11 formed by processing a single metal plate into a predetermined shape. The surface of the through anchor 10 shown in FIG. 1 is opposed to a vehicle body (attachment plate) such as a center pillar when the through anchor 10 is attached to an automobile.
A large number of irregularities on the metal surface, which will be described later, may be provided on the surface of the through anchor 10 facing the vehicle body (the surface shown in FIG. 1).
[0013]
Here, the insert fitting 11 is formed in a triangular shape in plan view, and a fitting insertion hole 12 is provided in the vicinity of one corner (upper side in the drawing). By inserting a bolt or the like into the insertion hole 12, the through anchor 10 can be rotatably attached to a center pillar or the like. A long hole extending along the side of the insert fitting 11 is formed in the vicinity of the side opposite to the corner where the insertion hole 12 is provided (the lower side in the figure), and the peripheral part of the long hole. A coating resin 13 is integrally formed on the substrate. A long hole webbing insertion hole 16 is defined by the coating resin 13. At both ends of the webbing insertion hole 16, a hole 16 a that communicates with the webbing insertion hole 16 and extends toward the fitting insertion hole 12 (upper side in the drawing) is formed.
[0014]
As a material of the insert metal fitting 11, for example, a carbon steel material (JIS SC material) can be cited.
Examples of the coating resin 13 include a polyamide-based resin such as polyamide 6 having high mechanical strength, a resin obtained by adding a reinforcing agent to polyacetal and polypropylene, and a polyethylene-based resin.
[0015]
The coating resin 13 that defines the webbing insertion hole 16 has a metal plate 14 on the portion where the webbing is slidably contacted (in the figure, the lower surface of the webbing insertion hole 16. The surface opposite to the fitting insertion hole 12 side of the webbing insertion hole 16). Is fixed. The metal plate 14 is made of carbon steel or the like. The metal plate 14 is curved in a substantially cylindrical shape so as to protrude toward the webbing insertion hole 16 side. Fine irregularities are formed on almost the entire curved surface of the metal plate 14. That is, the surface that provides one long side of the webbing insertion hole 16 of the through anchor 10 is a metal surface (webbing contact portion) having fine irregularities.
[0016]
FIG. 2 is an enlarged cross-sectional view showing irregularities on the surface of the metal plate 14. Such irregularities can be formed by shot blasting or shot peening, in which sand, small steel balls, glass balls, or ceramic powder / balls are sprayed on a metal plate 14 made of a steel material such as carbon steel. It can also be formed by pressing with a mold with fine irregularities or transferring with a roll.
After the unevenness is applied to the metal surface, a heat treatment is performed, and the unevenness is strengthened by preferably curing to HRC (Rockwell hardness) 15 or more.
[0017]
In the seat belt apparatus equipped with the through anchor 10 as described above, when high tension is applied to the webbing, the webbing thread is formed on the unevenness provided on the surface of the metal plate 14 which is the webbing contact portion of the through anchor 10. In close contact. Thereby, the friction coefficient of the through anchor 10 with respect to the webbing is increased, and the side slip of the webbing is remarkably prevented.
Even if the webbing is slid over and over the metal plate 14 of the through anchor 10 many times, the unevenness is strengthened by the heat treatment, so that the deformation and wear of the unevenness do not occur, and the coefficient of friction of the through anchor 10 with respect to the webbing is low. Never become.
[0018]
FIG. 3 is a plan view of the through anchor according to the second embodiment of the present invention. In the through anchor 20, a plurality of thin grooves 24 a are provided in parallel on the surface of the metal plate 24 fixed so as to face the webbing insertion hole 16. The groove 24a extends linearly in a direction perpendicular to the width direction of the webbing. The interval between the grooves 24a can be about 0.5 to 2 mm.
When the webbing is slid on the surface of such a metal plate 24, as shown in FIG. 4, the warp yarn 71 of the webbing 70 enters the groove 24a and the lateral displacement of the webbing 70 is prevented. In FIG. 4, 72 indicates a weft.
[0019]
FIG. 5 shows a modification of the groove formed in the metal plate. In the example shown in FIG. 5A, the grooves 34a are provided in a mesh shape.
In the example shown in FIG. 5B, the grooves 44 a are provided symmetrically with respect to the center of the metal plate 44. The groove 44a extends in a direction inclined with respect to the direction orthogonal to the webbing width direction.
In addition to these, various forms of irregularities are possible, and irregularities such as a checkered pattern may be used.
[0020]
FIG. 6 is a plan view of a through anchor according to a third embodiment of the present invention. In this through anchor 50, a rough surface portion 57 having fine irregularities and a smooth portion 58 having no irregularities as seen in the webbing width direction are formed on the surface of the metal plate 54 fixed so as to face the webbing insertion hole 16. It is provided alternately. The plurality of (here, two) smooth portions 58 are preferably in the form of a strip having a width of 2 mm or more, and extend in a direction inclined with respect to a direction orthogonal to the webbing width direction. The width of the smooth part 58 can be 5 mm or less.
In the present embodiment, all portions of the surface of the metal plate 54 other than the smooth portion 58 are rough surface portions 57.
[0021]
FIG. 7 is an enlarged cross-sectional view showing the surface of the metal plate 54. The unevenness of the rough surface portion 57 can be formed by the same method as the unevenness of the first embodiment.
The smooth portion 58 can be a surface having a height equivalent to the height of the convex portion in the rough surface portion 57.
An edge E is formed at the boundary between the smooth portion 58 and the rough surface portion 57.
[0022]
When the webbing tries to skid on the surface of the metal plate 54 of the through anchor 50, the edge E bites into the webbing and increases resistance to skidding. Therefore, combined with the high frictional resistance by the rough surface portion 57, the side slip of the webbing is suppressed and the jamming phenomenon is prevented.
[0023]
FIG. 8 is a plan view of a through anchor according to a fourth embodiment of the present invention. In this through anchor 60, a plurality of thin grooves 64 a are provided in parallel on the surface of the metal plate 64 fixed so as to face the webbing insertion hole 16 at intervals of about 0.5 to 2 mm, and the rough surface portion 67. Is formed. The groove 64a extends linearly in a direction perpendicular to the width direction of the webbing.
A plurality of smooth portions 68 a and 68 b are mixed in the rough surface portion 67. The smooth portions 68a and 68b are preferably strips having a width of 2 mm or more, and extend in a direction inclined with respect to a direction orthogonal to the webbing width direction. That is, the strip-shaped smooth portions 68 a and 68 b extend across the plurality of grooves 64 a of the rough surface portion 67.
In the present embodiment, a plurality (here, three) of first smoothing portions 68a extending in parallel and a plurality of (here, three) second smoothing portions extending in parallel in a direction different from the first smoothing portion 68a. A smoothing portion 68b is provided, and the first smoothing portion 68a and the second smoothing portion 68b intersect each other. That is, the 1st smooth part 68a and the 2nd smooth part 68b are provided in X shape. The width | variety of the 1st and 2nd smooth parts 68a and 68b can be 5 mm or less.
[0024]
FIG. 9A is an enlarged cross-sectional view showing the surface of the metal plate 64. The smooth portion 68 a or 68 b can be a surface having a height equivalent to the height of the bottom surface of the groove 64 a in the rough surface portion 67.
The warp yarn 71 of the webbing 70 enters the groove 64a of the rough surface portion 67 and also enters the smooth portion 68a (68b). When the webbing 70 tries to skid on the surface of the metal plate 64, the boundary between the rough surface portion 67 and the smoothing portion 68a (68b) bites into the webbing 70 and increases resistance to skidding.
Note that, as shown in FIG. 9B, the smooth portion 68a (68b) may have a height equivalent to the height of the convex portion (a portion between the grooves 64a) in the rough surface portion 67.
[0025]
FIG. 10 shows a modification of the metal plate. In the example shown in FIG. 10A, the grooves 74a are provided in a mesh shape to form the rough surface portion 77. In the rough surface portion 77, a plurality of smooth portions 78a and 78b which are preferably strips having a width of 2 mm or more and extend in a direction inclined with respect to the direction perpendicular to the webbing width direction are mixed.
In this example, a plurality (here, three) of first smoothing portions 78a extending in parallel and a plurality of (here, three) second smoothing portions extending in parallel in a different direction from the first smoothing portion 78a. 78b is provided, and the first smoothing portion 78a and the second smoothing portion 78b intersect in an X shape. The mesh-shaped groove 74a is parallel to the first smooth portion 78a and the second smooth portion 78b.
In the example shown in FIG. 10B, the rough surface portions 87a and 87b are formed by providing the grooves 84a in line symmetry with the center of the metal plate 84 as a boundary. The groove 84a extends in a direction inclined with respect to the direction orthogonal to the webbing width direction. The direction in which the groove 84a extends differs between one side and the other side with respect to the center of the metal plate 84. By the groove 84a, a first rough surface portion 87a is formed on one side with respect to the center of the metal plate 84, and a second rough surface portion 87b is formed on the other side. In the center of the metal plate 84 (between the first rough surface portion 87a and the second rough surface portion 87b), a strip-shaped smooth portion 88 extending in a direction perpendicular to the webbing width direction, preferably having a width of 2 mm or more is formed. . The width of the smooth portion 88 can be 15 mm or less.
Further, as shown in FIG. 10C, the effect can also be obtained by changing the width of the smoothing portion 88 (for example, by expanding the width) to incline the boundary between the smoothing portion 88 and the rough surface portions 87a and 87b.
[0026]
In addition, this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
For example, the present invention can be applied not only to a through anchor but also to a thruching, a retractor exit webbing guide, and other predetermined portions.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably prevent the jamming phenomenon while ensuring good slidability of the webbing in the webbing guide.
[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 an enlarged cross-sectional view of a main part of 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.
4 is an enlarged cross-sectional view of a main part of FIG. 3;
FIG. 5 is a diagram showing a main part of a modified example.
FIG. 6 is a front view showing a through anchor of a seat belt device according to a third embodiment of the present invention.
7 is an enlarged cross-sectional view of a main part of FIG.
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 an enlarged cross-sectional view of a main part of FIG.
FIG. 10 is a diagram showing a main part of a modified example.
FIG. 11 is an overall view of a seat belt device.
[Explanation of symbols]
10, 20, 50, 60 Through anchor (webbing guide)
11 Insert metal fitting 13 Coating resin 14, 24, 34, 44, 54, 64, 74, 84 Metal plate 16 Webbing insertion hole

Claims (4)

In a seatbelt device comprising a webbing that restrains the occupant's body to a seat, and a webbing guide having a long hole-shaped webbing insertion hole that is inserted through the webbing and a part of the inner surface of which is in contact with the webbing.
At least a part of the webbing guide contacting part with the webbing is made of metal, and a fine part including a recess having a depth of 0.1 to 0.5 mm into which the warp of the webbing enters the metal surface. Irregularities are formed ,
2. The seat belt device according to claim 1, wherein the recess includes a groove extending linearly in a direction perpendicular to the width direction of the webbing, and the interval between the grooves is 0.5 to 2 mm . In a seatbelt device comprising a webbing that restrains the occupant's body to a seat, and a webbing guide having a long hole-shaped webbing insertion hole that is inserted through the webbing and a part of the inner surface of which is in contact with the webbing.
At least a part of the contact portion of the webbing guide with the webbing is made of metal;
A rough surface portion having fine irregularities on the surface of the metal , including recesses formed by grooves of 0.5 to 2 mm at a depth of 0.1 to 0.5 mm when viewed in the width direction of the webbing in contact with the metal surface. And a surface having a height equivalent to the height of the convex portion in the rough surface portion or a surface having a height equivalent to the height of the bottom surface of the concave portion in the rough surface portion, and a smooth portion having no irregularities. Thus, an edge that allows biting of the webbing against side slip is formed at a boundary between the smooth portion and the rough surface portion. The seat belt device according to claim 2 , wherein the smooth portion extends in a direction inclined with respect to a direction orthogonal to the width direction. The rough surface portion is configured by a groove provided symmetrically with respect to a center of the metal in the width direction, and the groove extends in a direction inclined with respect to a direction orthogonal to the width direction. The seat belt device according to claim 2 , wherein a direction in which the groove extends is different between one side and the other side with respect to the center of the seat.

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