WO1980002572A1

WO1980002572A1 - Cord for tire

Info

Publication number: WO1980002572A1
Application number: PCT/JP1979/000132
Authority: WO
Inventors: K Nishimura; K Hirai
Original assignee: Sumitomo Rubber Ind; K Nishimura; K Hirai
Priority date: 1979-05-23
Filing date: 1979-05-23
Publication date: 1980-11-27

Abstract

Steel cord for a tire which is formed by twisting 3 to 5 steel filaments to form a side strand (5), disposing a core wire (9) or (10), formed of inorganic or organic strands of a type different from the steel filament, within a space surrounded by a plurality of the side strands (5) to form a steel strand, and then twisting a plurality of the steel strands.

Description

明

Title of invention ..

Tire code

Technical field

INDUSTRIAL APPLICABILITY The present invention is used for reinforcing a tire steel cord, in particular, a tire force layer, a breaker layer, a bead wire, and the like. Ste-ru-code and constituting the ste-ru-code

It relates to a steel strand.

Background art

Steel code is superior to other types of inorganic fibers and organic fibers in heat resistance, fatigue resistance and strength, and when this is used as a reinforcing material for tires, Improves tire wear resistance and maneuverability based on characteristics. Here, the steel cord normally used for tire reinforcement is made by twisting several steel strands (5) as shown in Fig. 1. Le Sutra

A plurality of coils (4) are bundled to form a steel cord (1), which is embedded in rubber and bonded by vulcanization. In this case, a steel cord is formed between the strands. Rubber does not sufficiently flow into space (2) and air remains. Such a steel cord-reinforced rubber layer is applied to the tire.

'The following problems have been encountered when used in components, such as the breaker layer or the force-cas layer.

(1) The residual air of the steel cord expands due to the heat generated by the tires while running, causing local distortion to increase, causing the steel cord and rubber to separate.

(2) If the tire is incised and damaged, water can enter the area and cause steel code to be generated.

__O PI W ^IPO '-,, (3) The contact area between the steel cord and the rubber is small.], So the adhesive strength is reduced. :

尙 The above problem is caused by the arrangement or

-It is possible to solve the problem to some extent by arranging the strands that compose the cord by making the cross-section a close-packed structure and minimizing the space in the steel cord. For example, the strand with seven strands shown in Fig. 2 is shown in Fig. 2 (a) and Fig. 2H.

-The space generated is small compared to the strand with seven strands, and the above problem can be solved somewhat. However, in the strand of the close-packed arrangement as shown in FIG. 2, the core element wire (6) is generally arranged inside the lateral element (5), and both are twisted]). However, the collar is inevitably different.13 The core element (6) and the side element (5) are mutually distorted, and such a strand is distorted. When used in a hard disk, it is subjected to extreme repeated expansion and contraction and bending, and as a result

This will cause the tire code to break. In the case of strands, it is especially important that strands have almost the same flammability.

2 The strand consisting of 5 to 5 strands shown in Figure M

From this point of view, it turns out that it is preferable as a reinforcing material for tires. However, due to the large gap between the steel elements], it has been desired to solve the above-mentioned problem.

Technology related to solving such problems

No. 7405 is known o The technology shown in this specification is a flat strand around the outer circumference of the core strand! ? Become the side

By configuring a land]) It is intended to leave a gap for rubber to enter between steel strands! ), Such techniques

O PI WIPO, The technique is not enough to solve the above problem, and the number of production is not enough.] 9 It was not always a preferred technology.

However, the present invention provides a steel strand which is free from distortion between steel elements and has improved adhesion to rubber, and a steel strand constituted by the steel strand. The purpose is to provide a code.

Disclosure of the invention

The present invention relates to a side formed by twisting 45 steel strands, and the inside of the space surrounded by the side line, the inside of the space surrounded by the side, made of inorganic fibers or organic fibers different from steel. Strand I? A strand having a core wire arranged thereon and a tire steel cord obtained by rubbing the strands together. By adopting such a structure 1) The space surrounded by the steel element is filled with organic fibers or the like, or between the steel element wires. Easy entry of rubber into space! ? The rubber is uniformly adhered to the steel element surface, and as a result, the air surrounded by the steel element wire does not remain, thereby preventing the steel sheet and the steel cord. Improved rubber adhesion can be achieved.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 shows a cut-away view of a conventional steel cord, and Fig. 2 (a) Fig. 2) shows 55 and 7 steel strands, respectively. 5 is a cross-sectional view of a steel strand according to the present invention, and FIG. 7 and FIG. 8 is a reference cross-sectional view of a steel strand. FIG. 9 and FIG. 11 show a still code according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in detail below with reference to the accompanying drawings.

The steel strand according to the present invention is composed of 55 steel strands, each of which is shown in FIG. 5 to FIG.

In each case, a strand of inorganic fiber or organic fiber of a different type from the steel is surrounded by the steel strand (5) and arranged as a core strand (9). You. Here, the material of the core element wire (9) may be an inorganic fiber such as glass fiber or asbestos, or a polyester, nylon, vinylon, or rayon. Organic fibers such as aromatic polyamide fibers are used. In the present invention, it is important that all side strands (5) are steel strands and have substantially the same twist].

] 3. With such a configuration]? When a load is applied, is there a uniform load on all the side strands?] No distortion occurs in the strand itself. Next, the core (9) included in the steel strand according to the present invention may be constituted by a strand formed by combining a plurality of strands of wires. Figure 2 shows a cross-sectional view of a case where a strand (10) in which five elements are twisted together 2) is used as the core wire.

Further, the strength of the core strands ( ⁹ ) and (10) of the steel strand according to the present invention is not required. This is made by twisting 55 steel strands] and simply placing the core wire in the space between the steel strands, which is inevitable when a steel strand is made. This can eliminate the problem of air remaining when vulcanized in rubber. However, when high-strength materials such as gacus fiber and aromatic polyamide are used as the material of the core wire, a strand that combines these excellent characteristics with the unique superior characteristics of steel. Do

J?, H A OMFI

— Is obtained. On the other hand, six or more steel strands are twisted! ) The configuration according to the present invention cannot be adopted in a strand configured together.

That is, in Fig. 2 (one steel core wire (6) and two steel side wires (5) surrounding it are arranged.In this case, the core wire (6) and the side wire (5 ) Integrally supports the load, but if the steel core) is replaced with another type of material, the strength of the strand itself will be reduced due to the low strength of the core. I do.

Next, the diameter of the core wire (D1) of the steel strand according to the present invention, as shown in FIG. It is desirable that the diameter be larger than the diameter of the inscribed circle (1> ² ) that is formed in the case where the strands are in contact with each other. This is because when the diameter of the inscribed circle (D2) is larger than the diameter of the core wire (D1)] ?, the side strands are in close contact with each other as shown in Fig. This is because the internal space surrounded by the line is shielded from the outside, and rubber can be prevented from entering the space. Therefore the

8 As shown in the figure, the diameter of the line () is the diameter of the inscribed circle (

D1) yo] 3 is slightly larger, and preferably D1 is within 1.1-2. 1-2 ^ ίΟ of D2. If the ratio is more than 2.0 times, it is difficult to manufacture a strand, and furthermore, the physical properties are significantly reduced.

However, when the steel strand according to the present invention is embedded in rubber and vulcanized and bonded, unvulcanized rubber passes through the gap between adjacent steel strands. It flows into the space surrounded by the steel strand, and the core of the steel strand and the core of organic fibers, etc., adheres sufficiently to the surface of the wire, and as a result, no air remains in the space In addition, the generation of 鍚 on the steel strand due to the intrusion of moisture can be effectively prevented. Furthermore, a steel strand according to the present invention.

OMPI WIFO Since a certain gap is maintained between adjacent steel strands, wear of the steel strands due to contact between the steel strands can be prevented.

Next, a plurality of steel strands according to the present invention are combined to form a tire steel cord. 5 or more steel strands are used, but when several steel strands of the same arrangement are combined, three or more steel strands of different arrangements are used. Several strands may be twisted together]) to form a steel code. Fig. 9 shows a steel strand with a 7X4 structure and a steel strand with a different arrangement assuming that the steel strand of the same arrangement is used. FIG. 10 shows the steal code of the structure of 1 X δ + 6 X 5 as used.は Steel code according to the present invention includes all structures usually formed using the above-described steel strand according to the present invention. As another embodiment of the steel code according to the present invention, FIG. 11 shows a 5 × 4 structure.尙 The steel strand according to the present invention can be used as a tire reinforcement as it is. O However, the steel strand and the steel according to the present invention can be used. If the cord is used as a tire reinforcement, especially as a breaker layer, it will improve the characteristics of steering and wear resistance, and will significantly reduce rubber cones.

OMPI WIPO

Claims

The scope of the claims .

1.3 Five steel strands are twisted and joined, and in the space surrounded by the steel strands, different types of inorganic fibers or An organic fiber strand or strand] is a steel strand for reinforcing tires, which is characterized by a core wire.

2.3 Five strands of strands are twisted 1) and combined, and in the space surrounded by the strands, inorganic fibers or organic fibers of a different type from steel are used. A tire reinforcement steel cord composed of multiple strands in which strands or strands D are arranged.

CM? I / No. WIPO

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