JP2002059808A - Webbing insert member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a webbing insert member such as a shoulder anchor allowing defective windings to be reduced and webbing to be extracted and wound satisfactorily by remarkably improving the efficiency of slippage thereof with the webbing. SOLUTION: The shoulder anchor 1 comprises a metal plate-like body 2, a slip piece 6 engaged with the body 2, and a synthetic resin mold 4. A low frictional material layer is formed on the front surface of the curved surface 6a of the slip piece 6. Fluororesin coatings in addition to ceramic coatings such as molybdenum disulfide, tungsten disulfide, boron nitride, and graphite fluoride in addition to a fluororesin coating, nickel plating, chromium plating, and boron plating are cited as the low frictional material layer. The front surface of the curved surface 6a is formed in a rough surface, and the sliding surface of the webbing is 7 to 17 μm in 10-point average roughness (Rz) and 150 to 350 μm in irregular average interval (Sm).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a webbing insertion member such as a shoulder anchor of a seat belt device.

[0002]

2. Description of the Related Art As is well known, a seat belt device is provided to protect an occupant by webbing in a high-speed moving body such as an automobile or an aircraft. For example, in a seat belt device for a front seat of an automobile, the webbing is hung on a shoulder anchor of a B pillar.

[0003] This shoulder anchor is usually insert-molded so as to cover the outer surface of a metal body with a synthetic resin (usually polyamide).

[0004]

The shoulder anchor is provided with a webbing insertion hole, and the surface on which the webbing slides, such as the inner surface of the insertion hole, is made of the above-mentioned synthetic resin. Is big.

An object of the present invention is to provide a webbing insertion member in which a webbing slides very smoothly.

[0006]

The webbing insertion member of the present invention is a webbing insertion member having a webbing insertion portion, wherein at least a portion of the insertion portion where the webbing slides is made of a low friction material, and Ten-point average roughness (Rz) 7 to 17 μm, average distance between irregularities (Sm) 150
It is characterized by having a rough surface of up to 350 μm.

In such a webbing insertion member, since the webbing is guided by the low friction material surface having a predetermined surface roughness, the sliding resistance is extremely small.

[0008] Generally, the webbing is coated with a resin. When the webbing slides with the webbing insertion portion, a part of the coating resin of the webbing rubs against the sliding surface of the insertion portion, thereby increasing the sliding resistance of the webbing. In the present invention,
By making the sliding surface rough and reducing the contact area with the webbing, the sliding resistance of the webbing becomes extremely small.

In the present invention, it is preferable that a metal piece is disposed on the sliding portion of the webbing, the surface of the metal piece is rough, and a low friction material is provided on the surface. The metal piece has a curved surface on which the webbing slides, and a pair of leg pieces connected to the curved surface,
It is preferable that the leg pieces hold the main body of the webbing insertion member. It is preferable to have a synthetic resin covering the periphery of the webbing insertion portion of the main body and the leg portion of the metal piece.

The low friction material is preferably one or both of a solid lubricant coating and a metal plating.

[0011]

FIG. 1 is a front view of a shoulder anchor as a webbing insertion member according to an embodiment, FIG.
Is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a perspective view of the slip piece.

The shoulder anchor 1 comprises a metal plate-shaped main body 2, a slip piece 6 engaged with the main body 2, and a synthetic resin mold 4.

An upper portion of the main body 2 is provided with a bolt insertion hole 2a for attachment to a B pillar, and a lower portion is provided with a webbing insertion hole 2b.

The slip piece 6 is formed by press-forming a metal plate to have a curved surface 6a and a pair of parallel leg pieces 6b, 6b. As shown in FIG. The edge of the webbing insertion hole 2b of the main body 2 is sandwiched between the portions 6b.

A synthetic resin mold 4 is formed by insert molding so as to cover the leg piece 6b and the periphery of the webbing insertion hole 2b of the main body 2, thereby improving the integration between the main body 2 and the slip piece 6. ing. As this synthetic resin, polyamide such as nylon can be used.

The curved surface 6a of the slip piece 6 is J
Ten-point average roughness (Rz) 7 defined in IS B 0601
１７17 μm, average interval of unevenness (Sm) 150-350 μm
m is a rough surface.

The rough surface is formed by shot blasting, sand blasting, shot peening, barrel polishing, or the like. A low friction material layer is formed on the rough surface. As the layer of the low friction material, a fluorine resin (for example, tetrafluoroethylene) coating, nickel plating,
In addition to chromium plating, boron plating and the like, ceramic coatings such as molybdenum disulfide, tungsten disulfide, boron nitride, graphite fluoride and the like can be mentioned. By forming a coating or plating having excellent solid lubricity, the sliding of the webbing becomes extremely good. Note that a plurality of plating layers may be formed, and one or more of the above-described coating layers may be formed on the plating layer.

Such a solid lubricating layer may be formed also on the surface of the synthetic resin mold 4.

According to the low friction material surface having the ten point average roughness and the average interval, the contact area with the webbing is small, and the sliding resistance of the webbing is extremely small. The ten-point average roughness (Rz) is particularly preferably 10 to 13 μm,
The average interval (Sm) is particularly preferably from 200 to 300 μm.

FIG. 4 is a front view of a webbing insertion member 8 according to another embodiment, and FIG. 5 is a sectional view taken along the line VV of FIG.

The webbing insertion member 8 is made of a metal plate as a whole, and has a bolt insertion hole 8a and a webbing insertion hole 8b. The lower edge side of this webbing insertion hole 8b is curved by a press so as to have a substantially C-shaped cross-sectional shape, and the surface of the curved portion 8c has a ten-point average roughness (Rz) of 7 to 17 μm and an average interval of irregularities (S
m) A rough surface of 150 to 350 μm. The solid lubricating plating or coating layer is formed on the rough surface.

Although the above embodiment relates to a shoulder anchor, the present invention can be applied to a tongue and the like of a seat belt device.

[0023]

As described above, according to the webbing insertion member of the present invention, by significantly improving the slipping efficiency with respect to the webbing, it is possible to reduce the winding failure and to perform the pulling and winding operation satisfactorily.

[Brief description of the drawings]

FIG. 1 is a front view of a shoulder anchor as a webbing insertion member according to an embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view of a slip piece.

FIG. 4 is a front view of a webbing insertion member 8 according to another embodiment.

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

[Explanation of symbols]

 1, 8 Shoulder anchor 2 Main body 2a, 8a Bolt insertion hole 2b, 8b Webbing insertion hole 4 Synthetic resin mold 6 Slip piece 6a Curved surface 6b Leg piece 8c Curved portion

Claims (6)

[Claims] 1. A webbing insertion member having a webbing insertion portion, wherein at least a portion of the insertion portion where the webbing slides is made of a low friction material, and has a ten-point average roughness (Rz) of 7 to 17 μm. Average spacing of unevenness (Sm) 1
A webbing insertion member having a rough surface of 50 to 350 μm. 2. The metal piece according to claim 1, wherein a metal piece is disposed on a sliding portion of the webbing, a surface of the metal piece is rough, and the low friction material is provided on the surface. Webbing insertion member. 3. The metal piece according to claim 2, wherein the metal piece has a curved surface on which the webbing slides and a pair of leg pieces connected to the curved surface, and the leg pieces are inserted through the webbing. A webbing insertion member characterized by holding a main body of the member. 4. The webbing insertion member according to claim 3, further comprising a synthetic resin that covers a periphery of the webbing insertion portion of the main body and a leg portion of the metal piece. 5. The webbing sliding member according to claim 1, wherein a metal curved portion integrally connected to the metal body of the webbing insertion member is provided in the webbing sliding portion, and the surface of the curved portion is the rough surface. A webbing insertion member, wherein the low friction material is provided. 6. The webbing insertion member according to claim 1, wherein the low friction material is one or both of a solid lubricant coating and a metal plating.