JPH0748406Y2 - Bead wire - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bead wire for a tire.

[0002]

2. Description of the Related Art The ends of fibers and steel wire cords forming a carcass, which is a strength member for maintaining the inner pressure of a tire, are wound around and fixed, and the dimension of the inner circumference of the tire is regulated to fit with a rim. The bead wire, which is an important tire material to be secured, is (1) a quadrangular strand bead wire, (2) a hexagonal single wire bead wire, (3)
There are three types of cable bead wires with a circular cross section.

A strand bead wire having a quadrangular cross section is a bead wire in which a plurality of steel wires are arranged in parallel and covered with rubber, and the steel wire band is wound in layers. A single wire bead wire having a hexagonal cross section is one steel wire. It is a bead wire in which a steel wire is coated with rubber, and the steel wire is continuously wound in parallel and laminated to form a bale stack, and a cable bead wire with a circular cross section is a steel wire on the outer surface of an endless metal ring. Is a bead wire that is spirally wound.

A strand bead wire having a quadrangular cross section has a drawback that its cross-sectional shape is easily distorted when it is embedded in a tire carcass and molded and vulcanized, and although it could be used in a bias tire, it is inconvenient and not useful in a radial tire. It's gone. A bead wire with a hexagonal cross-section, whose cross-sectional shape was difficult to change during molding and vulcanization of the tire, was introduced later, but it was useful for certain truck tires with a low shape of the so-called 15-degree taper.
Generally, in a bead wire in which steel wires are arranged in parallel, the effective strength used for a finished tire is about 40% of the inherent strength of the wire.

Ideally, a bead wire that can maintain the same cross-sectional shape and preferably has a generally circular cross-section. A bead wire having a circular cross section is most suitable for a tire using a steel cord for a carcass, such as an all-steel radial tire. This is the reason why the cable bead wire with a circular cross section appeared. Around a cored bar butt-welded with a low- or medium-carbon steel wire having a circular cross-section (some cross-sections other than a circular cross-section such as a rectangular cross-section) having the same cross-sectional shape in the length direction as a ring In addition, the cable bead wire formed by closely arranging the high carbon steel wire in a spiral winding enables about 75% of the material strength to be used as effective strength. This cable bead wire slides between the cord and the spirally wound high carbon steel wire and between the spirally wound high carbon steel wire and the cored bar against displacement of the carcass cord during tire vulcanization. Therefore, it is possible to maintain the cross-sectional shape.

[0006]

However, especially in the case of a bead wire for a large tire, two or three layers of spiral winding are required even if the above-mentioned configuration is adopted, so that the manufacturing cost is increased and it is popularized. The current situation is that progress has not made much progress.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a bead wire that reduces the manufacturing cost and is more easily spread.

[0007]

In order to achieve the above object, the first invention is a bead wire in which a metal wire is spirally wound around a peripheral surface of a metal or non-metal endless annular body, Place the spirally wound metal wire on the circumferential surface of the annular body.
A large diameter wire to be placed on the outer peripheral surface of the wire,
A plurality of wire rods with a diameter smaller than the above wire rods, and both wire rods
A cross-sectional shape that holds the bundle in an almost triangular bundle as a whole.
It is formed by a wrapping member .

In the second invention, the wire having a large diameter is defined in claim 1.
Material and small-diameter wire as a wrapping member made of metal or
Is a non-metallic linear object that is wound in a spiral to form a bundle.
There is. In the third invention , the large diameter
Use wire rods and small diameter wire rods as rubber as a wrapping member.
It is further covered to form a bundle.

[0009]

Therefore, according to the present invention, a spirally wound metal wire is provided with a large-diameter wire located on the circumferential surface side of the annular body, and
A plurality of wires that are in contact with the outer peripheral surface and have a smaller diameter than the wire
Of the wire rod and the two wire rods have a cross-sectional shape of almost three
Since it is formed by a wrapping member that holds a rectangular bundle , a metal wire rod is spirally wound in a thin state on the peripheral surface of the annular body.
You can As a result, even in the case of a bead wire for a large tire, the bead wire can be completed by only one layer of spiral winding, which is inexpensive to manufacture .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the cross-sectional diameter is 6.0.
A metal wire rod for spiral winding (hereinafter referred to as a spiral winding line) 3 on a peripheral surface of a metal endless annular body (hereinafter referred to as a core metal) 2 mm.
Is spirally wound around the core metal 2 at a pitch of 6 turns,
In the same manner, the bead wire 1 of the present invention is obtained by surrounding the entire circumference of the cored bar 2 by repeating 2 rounds, 3 rounds ... 11 rounds. As shown in FIG. 2, the spiral winding line 3 the over one hard steel wire 4 as a wire having a large diameter (sectional diameter 2.39 mm)
A wire with a diameter smaller than the hard steel wire 4 ( cross-sectional diameter 1.70 mm ).
The two hard steel wires 5 are in close contact with each other and the cross-sectional shape is almost
Arranged so as to be triangular bundle of nylon yarn 6 as the wrapping member to the outer periphery of the three hard steel wire 4,5
It is formed by spirally winding and lapping. The two hard steel wires 4 and 5 are parallel to each other without being twisted.
The lines are touched. Incidentally, 7 is a tire bead portion, and 8 is a cord.

As in this embodiment, by arranging two hard steel wires 5 thinner than the hard steel wire 4 on the single hard steel wire 4, the spiral winding line 3 has a substantially triangular cross section. When formed, as shown in FIG. 1, the spiral winding line 3 is spirally wound in a dense state on the peripheral surface of the cored bar 2, and no gap is formed between the spiral winding lines 3 adjacent to each other. Therefore, even when the tire is molded and vulcanized, the cross-sectional shape of the bead wire 1 is reliably held and there is no fear of distortion.

In another example shown in FIG. 3, the spiral winding line 3 is formed by coating the outer circumference of three hard steel wires 4, 5 with rubber 9. The invention is not limited to the above-described embodiment, and the cored bar 2 may be formed of a non-metallic material such as aramid fiber, or the nylon thread 6 may be wrapped with a linear material of a metallic material. Alternatively, the spirally wound line 3 may be formed by further coating the outer circumference of the three wrapped hard steel wires 4 and 5 with rubber.

[0013]

As described in detail above, according to the present invention, for example, in the case of a conventional two-layer spirally wound bead wire of a size of 20 inches, 1 × 6 + 11 + 17 × 2.2,
The number of spiral windings is 11 × 6 = 66 times for the first layer and 1 for the second layer.
7 × 6 = 102 times, which required 168 times in total, but the bead wire of the present invention has a spiral winding number of 66/16.
There is an excellent effect that the manufacturing cost can be reduced by reducing 8 or about 60%.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a bead wire embodying the present invention.

FIG. 2 is a partially enlarged perspective view of a spiral winding line.

FIG. 3 is a cross-sectional view of a bead wire of another example.

[Explanation of symbols]

2 Core bar (annular body) 3 Spiral winding line (metal wire material) 4 Hard steel wire (wire material) 5 Hard steel wire (wire material) 6 Nylon thread (linear material) 9 Rubber

Claims (3)

[Scope of utility model registration request] 1. An endless annular body (2) made of metal or non-metal.
Of the peripheral surface, the bead wire metal wire material (3) wound helically wound, the helical winding of metal wire material (3), the peripheral surface of the annular body (2)
Large diameter wire (4) located on the side and outside of the wire (4)
A plurality of diameters that are in contact with the peripheral surface and have a smaller diameter than the wire (4)
A cross section of a wire rod (5) and both wire rods (4, 5)
Is a wrapping part that holds the shape of a triangle as a whole
A bead wire formed by a material . 2. A large-diameter wire (4) and a small-diameter wire (5)
It is a metal or non-metallic linear as wrapping member
The bead wire according to claim 1, wherein the object (6) is spirally wound to form a bundle . 3. A large diameter wire (4) and a small diameter wire (5)
It is covered by the rubber as a wrapping member with bundled
The bead wire according to claim 1 , wherein the bead wire is formed in .