JPH1121776A - Bundled steel cord for reinforcing rubber and bundled steel cord-rubber composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bundled steel cord suitable for a rubber composite capable of reducing the friction loss and improving the durability by waving plural steel wires in at least a different pitch phase, arranging the plural wires side by side in the same plane, wrapping a wrapping wire around the prepared steel wires and bundling the steel wires. SOLUTION: This bundled steel cord is obtained by waving steel wires 1a to 1c in a cross-sectional flat shape such as an ellipse or an oval directed to the cord major axial direction X or the cord minor axial direction Z into a wavy form or a spiral form in at least a different pitch phase, arranging the steel wires side by side in the same plane without laying thereof and then wrapping a wrapping wire 2 having the carbon content c2 wt.% within the range of 0.05<=c1-c2<=0.40 based on the carbon content c1 wt.% of the steel wires 1a to 1c and a cross-sectional flat shape such as the ellipse or the oval around the whole steel wires 1a to 1c. The bundled steel cord is embedded parallel to a rubber in a tire belt part to produce a tire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergent steel cord and a convergent steel cord / rubber composite preferably used for reinforcing rubber of various tires and conveyor belts, particularly for reinforcing rubber of a tire belt portion. It is.

[0002]

2. Description of the Related Art As a steel cord for rubber reinforcement of a tire, a conveyor belt, or the like, a plurality of steel wires are formed in a wave shape or a spiral shape. We have developed and proposed a flattened convergent steel cord that is parallel in one plane and has a wrapping wire wrapped around each steel wire and bundled. This convergent steel cord is formed by forming each steel wire in a corrugated or spiral shape and juxtaposed, and is efficiently manufactured with a relatively simple process of winding a wrapping wire with high accuracy and provided at a low cost. It has rubber permeability and prevents deterioration of wire characteristics due to twisting of steel wires and flattening of cords, etc., and each steel wire exerts the same rubber reinforcing function individually without special interference as cord core wire As a result, it has excellent rubber reinforcement performance, reliability and durability. Furthermore, the cord shape is moderately retained by the wrapping wire, and the cord becomes a flat cord having different bending strengths in the binary direction (long and short diameter directions). There are features such as being buried with high accuracy. (For example,
JP-145578, JP-A-7-157986)

[0003]

The conventional convergent steel cord for rubber reinforcement has the above-mentioned excellent features, but a plurality of steel strands are bundled by a wrapping wire to keep the shape. Therefore, the steel wire is locally worn away by the wrapping wire, which contributes to a decrease in durability. If the cords are loosely bundled, there is a limit to the prevention of the abrasion, such as a decrease in shape retention performance. In addition, there is a problem that it is necessary to further diversify the cross-sectional flat shape and the bending strength in the two-way direction to increase the responsiveness to the rubber reinforcing conditions.

The present invention has been developed in order to solve the above-mentioned problems. The object of the present invention is to make the wrapping wire a relatively moderate soft material and to use the wrapping wire or the steel wire. Constructed in a cross-sectional flat shape, with the waveform of each steel strand oriented in the major axis direction or minor axis direction and arranged in parallel, embedded in the tire belt part, etc. Another object of the present invention is to provide a convergent steel cord and a convergent steel cord / rubber composite for rubber reinforcement, which are further diversified to enhance versatility.

[0005]

A plurality of corrugated or spirally formed steel wires are arranged in a plane without twisting them at least in different pitch phases, and a wrapping wire is formed on the entire steel wires. Convergent steel cord for rubber reinforcement wound and bundled has basically excellent rubber permeability and rubber reinforcement performance, reliability and durability,
The diameter and the number of the steel wires, the corrugation or the shape of the spiral, and the like are changed as required, so that the cross-sectional flat shape and the bending strength in the binary direction can be diversified. The present invention further provides that the carbon content of the steel strand is c
Assuming 1 wt%, the carbon content c2 of the wrapping wire
wt% is set to 0.05 ≦ c1−c2 ≦ 0.40, that is, the wrapping wire is made a relatively moderate soft material to effectively reduce the abrasion of each steel strand, or
The wrapping wire is configured to have a cross-sectional flat shape such as an ellipse or an ellipse, and the contact area between each steel strand and the wrapping wire is widened to further reduce the abrasion, thereby further improving the durability. Therefore, the steel wire can be relatively tightly restrained by the wrapping wire, and the cord shape can be shaped into a transverse flat shape immediately after being bundled. The reliability of the rubber reinforcement has been further improved.

In the above-mentioned converging steel cord for rubber reinforcement, the corrugations of the steel strands are directed in the major axis direction or the minor axis direction of the steel wires so that they are arranged in parallel on one plane, or Compliant to rubber reinforcement conditions, such as by constructing a cross-sectional flat shape such as an ellipse or an ellipse to further diversify the transverse flat shape of the cord and the bending strength in the binary direction (long-axis direction, short-axis direction). , The versatility is further enhanced.

Further, the converging steel cords for rubber reinforcement are bundled and retained by a wrapping wire, and the transverse flat shape and the bending resistance in the binary direction (long diameter direction, short diameter direction) are further diversified. Therefore, the rubber belt is buried in the rubber of the tire belt portion in parallel with high precision, and excellent rubber reinforcement performance and reliability corresponding to the rubber reinforcement conditions of the tire belt portion with high precision can be obtained.

[0008]

FIG. 1 shows a first embodiment of the present invention, and FIG.
FIG. 3 shows a second embodiment, FIG. 3 shows a third embodiment, FIG.
5 is a fifth embodiment, FIG. 6 is a sixth embodiment, FIG. 7 is a seventh embodiment, FIG. 8 is an eighth embodiment, FIG. 9 is an apparatus for manufacturing a converging steel cord for rubber reinforcement, and FIG. FIG. 4 shows a comparative characteristic diagram of elongation-load. In the figures, 1a to 1c are transversely round steel strands, 11a to 11c are transversely flat steel strands such as ellipses and ellipses, 2 is a transverse round wrapping wire, 12
Is a wrapping wire with a flat cross section such as an ellipse or an ellipse, P
Is a corrugated or spiral pitch formed in the steel strand, α is a gap formed between the steel strands, XX
Is a cord major axis direction, YY is a cord longitudinal direction or cord center line, ZZ is a cord minor axis direction, 21 is a guide roll of a steel wire, 22 is a corrugating device of a steel wire, 2
3 is a guide roll, 24 is a steel wire phase adjustment roll, 25 is a guide roll, 26 is a wrapping wire supply hobbin, 27 is a wrapping wire feeding roll, 28
Is a shaping roll.

In the illustrated embodiment, a plurality of steel strands 1a to 1c or 11a formed in a corrugated or spiral shape are shown.
11c at least with a different pitch phase (if necessary, wave shape and spiral shape of the steel wire have different shapes and pitches), do not twist them, and lay them in parallel in one plane X, Y to wrap the entire steel wire Wire 2 or 12
When the carbon content of the steel strands 1a to 1c or 11a to 11c is c1 wt% in the rubber reinforcing convergent steel cord bundled by winding
Or, if the carbon content c2wt% of 12 is 0.05 ≦ c1-c
It is a convergent steel cord for rubber reinforcement characterized in that 2 ≦ 0.40.

A plurality of corrugated or spirally formed steel wires 1a to 1c or 11a to 11c are arranged in parallel in one plane X, Y without being twisted at least in different pitch phases, and the entire steel wires are A convergence steel cord for rubber reinforcement, wherein the wrapping wire 12 is formed in a transversely flat shape such as an ellipse or an ellipse, in which the wrapping wire 12 is wound and bundled. .

In the above-mentioned convergent steel cord for rubber reinforcement, if the carbon content of the steel strands 1a to 1c or 11a to 11c is c1 wt%, the wrapping wire 2
Or, if the carbon content c2wt% of 12 is 0.05 ≦ c1-c
2 ≦ 0.40 and wrapping wire 1
2 is a converging steel cord for rubber reinforcement characterized in that it is formed in a cross-sectional flat shape such as an ellipse or an ellipse.

In the above-mentioned convergent steel cord for rubber reinforcement, the steel strands 11a to 11c are formed in a cross-sectionally flat shape such as an ellipse or an ellipse, thereby forming a convergent steel cord for rubber reinforcement.

In the above-mentioned converging steel cord for rubber reinforcement, the corrugation of each steel wire is performed in the cord major axis direction X-.
X or Y in one plane X, Y
Convergent steel cord for rubber reinforcement characterized by being paralleled inside.

Further, in the above-mentioned convergent steel cord for rubber reinforcement, the convergent steel cord for rubber reinforcement is embedded in parallel in rubber in a tire belt portion in parallel. I'm in the body.

More specifically, the steel strands 1a to 1
c, 11a to 11c are obtained by forming a steel wire having a relatively high carbon content into a circular cross section (steel wires 1a to 1c) in a plurality of stages.
1c—see FIGS. 1 to 4) or a relatively hard and small diameter wire that has been drawn to a narrow diameter of a cross-sectional flat shape (steel wires 11a to 11c—see FIGS. 5 to 8) and brass-plated as necessary. It has a steel strand. Specifically, a relatively high carbon content of 0.82, 0.86, or 0.1, depending on the application.
A relatively high-hardness, small-diameter steel wire having a wire diameter of 92 wt% and a wire diameter of 0.10 to 0.50 mmφ is applied. Further, this steel wire is formed in a corrugated or spiral shape (not shown) by an appropriate means (corrugating device 22 shown in FIG. 9 or the like), and these two to five wires are not twisted with each other and are not twisted. It is bundled by the wrapping wire 2 or 12 in parallel in the planes X and Y.

The wrapping wires 2 and 12 are formed by traversing a steel wire rod having a relatively low carbon content in a plurality of stages in a circular cross section (lapping wire 2-see FIGS. 1, 2, 7 and 8) or a flat cross section (lapping wire). The wire 12 is drawn into a small diameter of the wire 12 (see FIGS. 3 to 6), and is made into a relatively soft steel wire which is brass-plated as required. Further, assuming that the carbon content of the steel strand is c1 wt%, the carbon content c2 wt% of the wrapping wire 2 or 12 is 0.0
It is configured so that 5 ≦ c1−c2 ≦ 0.40. That is, the carbon content c2 of the wrapping wire is lower by about 0.05 to 0.40 wt% than the carbon content c1 of the steel strand, and is made to be a moderately small diameter or equivalent diameter as compared with the steel strand and relatively soft and small in diameter. Is applied, and one or two of the plurality of steel strands are wound and bundled by an appropriate means (see FIG. 9 and the like).

An embodiment of the cord manufacturing apparatus shown in FIG. 9 will be described. A relatively high carbon content steel strand (three in the illustrated example) 1a-1c or 11a-11c is a supply bobbin (not shown). The steel wire is fed out at a predetermined speed as indicated by an arrow, and each of the steel strands is passed through a guide roll 21 by a pair of corrugating devices 22 in a cord major axis direction XX or a cord minor axis direction ZZ (not shown). After being directed to the same shape and corrugated to the pitch P, the guide roll 23
Through a different length path by a phase adjusting roll 24 to obtain an appropriately different pitch P phase (corresponding to the cord longitudinal direction Y
-Y), each of the steel strands 1a to 1
1c or 11a to 11c are again transferred in parallel to one plane (X, Y) with different pitch phases. Further, the wrapping wire 2 or 12 having a relatively low carbon content is unwound from the supply hobbin 26, is swirled around the cord center line YY (the cord longitudinal direction) by the unwinding roll 27, and is being transferred in parallel. Each of the steel wires that are fed out around the steel wire, corrugated and arranged in parallel are wound with a predetermined pitch to form a convergent steel cord. Further, this convergent steel cord is shaped 28 (longer and shorter diameter sides) by a shaping roll 28 (a pair of rolls in the long diameter direction and the short diameter direction) as shown in FIG. It is manufactured with high efficiency and accuracy and is wound on a winding bobbin (not shown).

In the above-described cord manufacturing apparatus, the arrangement of the corrugating device 22 is changed, or a plurality of corrugating devices are used for each steel wire to perform corrugation, so that the corrugation and pitch of each steel wire are different. Can be something. Further, it is also possible to adopt a manufacturing mode in which each steel element wire is individually formed in a spiral shape by a conventional spiral forming means which guides each steel element wire and rotates around it (not shown). The pay-out roll 27 is controlled to rotate in accordance with the corrugation of the steel wire, the pitch P of the spiral, and the transfer speed. As shown in the drawing, the delivery roll 27 is wound with the same winding pitch as the pitch P of each steel wire. It is easy to adjust the winding pitch to twice the length of P and wind it.

The convergent steel cord shown in FIG. 1 (first embodiment) has a relatively high carbon content c1 wt% and circular transverse steel strands 1a to 1c (three), and a carbon content of the steel strand. 0.05 ~ 0.40wt% than c1wt%
Each of the steel strands 1a to 1 is composed of a single wrapping wire 2 having a low carbon content c2wt% and having a circular cross section.
1c is oriented in the cord major axis direction XX with the same shape and pitch P and corrugated, and then each steel wire is arranged at least in a moderately different pitch P phase (corresponding to the cord longitudinal direction YY) to form one plane. The flat cords are arranged in parallel in X and Y, and are wrapped with the wrapping wire 2 wound around the entire steel wires 1a to 1c.

The convergent steel cord of the first embodiment is configured as described above, and the respective steel wires 1a to 1c are formed in a wave shape and arranged in parallel, and the wrapping wire 2 is wound by a relatively simple process with high efficiency. Manufactured with high precision and provided at low cost, moderate gap α is formed between steel wires, has excellent rubber permeability, and wire characteristics by twisting steel wires and flattening cords This prevents the steel wires from deteriorating and effectively exerts the same rubber reinforcing function individually without any particular interference with the cord core wires. I have. In addition, the transverse flat shape and the bending strength in the two-way direction are diversified depending on the diameter and the number of the steel wires, the shape of the corrugation, and the like, so as to correspond to the rubber reinforcing conditions. Further, the steel wires 1a to
Wrapping wire 2 for carbon content c1wt% of 1c
The carbon content c2wt% is made a moderate soft material lower by about 0.05 to 0.40wt%, so that the abrasion of each steel strand is effectively reduced, and the durability and the reliability of rubber reinforcement are enhanced. Therefore, the wrapping wire 2 makes it possible to bind the cord relatively strongly. Immediately after the binding, the outer shape of the cord is shaped into a flat shape 28 with high precision, thereby improving the shape retaining performance of the cord and preventing the variation of the steel strand. The reliability of rubber reinforcement has been further improved.

Similarly, the corrugations of the steel strands 1a to 1c are similarly directed in the cord major axis direction XX so that one plane X,
As shown in FIG. 1B, since they are arranged in parallel in Y, the bending strength difference in the binary direction (major axis direction XX / minor axis direction ZZ) together with flatness (ratio of major axis size / minor axis dimension) Is relatively large.

The convergent steel cord shown in FIG. 2 (second embodiment) is different from the first embodiment in that the corrugations of the steel wires 1a to 1c are similarly directed in the cord short-axis direction ZZ to make a single plane X , Y, and is characterized by the structure parallel to the inside, and the other configuration is basically the same as that of the first embodiment. Therefore, basically, the same operation and effect as those of the first embodiment are obtained, and as shown in FIG. 2B, the bending strength difference in the binary direction as well as the flatness is extremely small.

The convergent steel cord shown in FIG. 3 (third embodiment) is made of the same material as the steel wires 1a to 1c in place of the wrapping wire 2 of the first embodiment, and has a transverse flat shape such as an ellipse or an ellipse. The present invention is characterized in that transversely round steel strands 1a to 1c are bundled using a wrapping wire 12, and the other configurations are basically the same as those of the first embodiment. Accordingly, basically the same operation and effect as those of the first embodiment are obtained, and the lapping wire 12 having the flattened cross section widens the contact area with each of the steel wires 1a to 1c to effectively reduce the abrasion. The durability is further improved. Further, if necessary, the wrapping wire 12 may be further set to 0.05 to 0.4% more than the carbon content c1 wt% of the steel strand.
By using a material having a carbon content c2 wt% that is lower by 0 wt%, the abrasion of each steel wire is further reduced effectively, and the durability is increased. As shown in FIG. 3B, the flatness and the bending strength difference in the binary direction are configured in the same manner as in the first embodiment.

The convergent steel cord shown in FIG. 4 (fourth embodiment) is similar to the third embodiment in that the corrugations of the steel strands 1a to 1c are similarly directed in the cord short-axis direction ZZ to form one plane X. , Y are characterized by a parallel structure, and the other configuration is basically the same as that of the third embodiment. Therefore, basically, the same operation and effect as those of the first embodiment are obtained, and as shown in FIG. 4B, the difference between the flatness and the bending resistance in the binary direction is extremely small as in the second embodiment. ing.

The convergent steel cord shown in FIG. 5 (fifth embodiment) is a steel wire 11a having a transverse flat shape such as an ellipse or an ellipse made of the same material in place of the steel wires 1a to 1c of the third embodiment. 11 to 11c, and is characterized in that it is bundled by the wrapping wire 12 of the third embodiment, and the other configuration is basically the same as that of the third embodiment. Therefore, basically, the same operation and effect as those of the third embodiment are obtained.
Wrapping wire 12 having a transverse flat shape (if necessary, 0.05 to 0.40 wt% based on the carbon content of the steel strand)
(Low carbon content), the durability is further improved by further increasing the contact area with each of the steel strands 11a to 11c having the same transverse flat shape and effectively reducing the abrasion. FIG.
As shown in B, when both the major axis direction and the corrugation direction of the transverse flat shape of each of the steel wires 11a to 11c are directed in the major axis direction XX, the size of the major axis direction XX and the bending resistance in the same direction are obtained. The strength is remarkably increased, the size of the cord in the minor diameter direction Z-Z and the bending resistance in the same direction are significantly reduced, and the flatness and the bending resistance difference in the binary direction are greatly different. Further, as shown in FIG.
It is also configured to have a structure in which the major axis direction of the transverse flat shape of 1a to 11c is oriented in the minor axis direction ZZ and the corrugating direction is oriented in the major axis direction XX, and the size of the minor axis direction ZZ. In addition, the bending strength in the same direction is significantly increased, and the flatness and the bending strength difference in the binary direction are configured to be appropriately different.

The convergent steel cord shown in FIG. 6 (sixth embodiment) is different from the fifth embodiment in that the longer diameter direction of the transverse flat shape of each of the steel strands 11a to 11c is changed to the longer diameter direction X- as shown in FIG. 6B. X is characterized by a configuration in which this corrugation direction is directed to the cord minor axis direction Z-Z, and the other configuration is the same as that of the fifth embodiment, and is basically the same as that of the fifth embodiment. It has the same function and effect, and has the size in the cord major axis direction XX and the bending strength in the same direction, the cord minor axis direction ZZ
Is appropriately increased, and the flatness and the bending strength difference in the binary direction are further different from those of the fifth embodiment.
Alternatively, as shown in FIG. 6C, each of the steel strands 11a to 11
c, the major axis direction of the transverse flat shape and the corrugation direction are both oriented in the minor axis direction ZZ, and the size of the minor axis direction ZZ and the bending strength in the same direction are remarkably improved. As a result, the flatness and the bending strength difference in the binary direction become further different.

In addition to the embodiment shown in FIGS. 1 to 6, each of the steel strands 1a to 1c and 11a to 11c is formed in a spiral shape by appropriate conventional means, and is arranged in parallel in X and Y in one plane. Then, the wrapping wires 2 and 12 are wound around the entire steel strand and bundled to form various converging steel cords as in the above-described embodiment (not shown). This converging steel cord has basically the same operation and effect as the above-mentioned embodiment, and since the steel wires are formed in a spiral shape and are arranged in parallel in one plane, the steel wires are relatively , The bending strength and the difference in strength in the binary direction are relatively small, and the flatness is adjusted by the number of steel wires, the spiral diameter, and the like.

In addition to the convergent steel cord of the above-described embodiment, a wrapping wire 2 having a circular cross section as in the first embodiment is used instead of the wrapping wire 12 of the fifth and sixth embodiments. A convergent steel cord having a structure as shown in FIGS. 7 and 8 (seventh and eighth embodiments), or
Each steel wire is formed in a spiral shape by a conventional appropriate means, is arranged in parallel in one plane X, Y, and a wrapping wire 2 or 12 is wound around the entire steel wire and bound to form a convergent steel cord ( (Not shown).

The converging steel cord of each of the embodiments described above is suitably used as a rubber reinforcement for a tire belt portion. That is, as described above, the plurality of steel strands 1a to 1
c, 11a to 11c are formed in a wave shape or a spiral shape and are arranged in parallel in one plane X and Y, and the wrapping wire 2 or 12 is wound around the whole steel wire and bundled to keep the shape. Since the degree of flatness and the difference in bending strength in the two-way direction are significantly diversified, a convergent steel cord having a desired shape and cord characteristics is selected in accordance with the rubber reinforcing conditions of the tire belt portion, and the rubber of the tire belt portion is selected. It is applied as a convergent steel cord / rubber composite that is easily and accurately aligned and embedded inside, and exhibits excellent rubber reinforcement performance corresponding to various tire reinforcement conditions, dramatically improving tire performance and significantly increasing durability. Can be

The convergent steel cord of each example was manufactured and subjected to a load and a fatigue test. The elongation-load comparison characteristic diagram shown in FIG. 10 shows a sample A in which a circular cross-section steel wire is formed in a wave shape and a steel wire (three) of the sample A having a circular cross-section as in the first embodiment. The convergent steel cord bundled with lapping wire 2 (0.05 to 0.40 wt% lower carbon content than the steel wire) was bundled with sample B, and the steel wire (four) of sample A was bundled with similar wrapping wire. It is a result of a load test using a convergent steel cord as a sample C. As is clear from the drawing, the elongation of the sample B is about 1/3, that is, the load is about three times as large as that of the sample A, and the elongation of the sample C is about 1/4, that is, the load is about four times, The evaluation that the characteristics of each steel strand worked effectively was obtained. Furthermore, as a result of a well-known three-roll fatigue test, the sample B and the sample C have a life, that is, a durability of 1.10% to 1.2% as compared with the convergent steel cord previously developed and proposed.
It has been confirmed that it can be increased to about 0%. Also, in the case of using a transverse flat wrapping wire or a transverse flat steel element wire, it is possible to effectively reduce the abrasion of the steel element wire and increase the cord shape retention force of the wrapping wire. For example, the life, that is, the durability is similarly improved. Furthermore, it has been confirmed that similar actions and effects, such as substantially the same life, that is, improved durability, can be obtained in each of the other examples.

Although the illustrated embodiment shows only a typical example of a converging steel cord in which three steel wires are bundled by one wrapping wire, the present invention further includes two to five steel wires. Is applied as a convergent steel cord bundled by one or two wrapping wires, and further, by combining the constitutions of the embodiments, as a convergent steel cord having further various configurations.

[0032]

According to the present invention, a plurality of steel strands formed in a corrugated or spiral shape as described above are arranged in a plane without twisting them with at least different pitch phases, and the entire steel strands are arranged in parallel. It is a converging steel cord for rubber reinforcement that is wrapped around a wrapping wire and has excellent rubber permeability and rubber reinforcement performance, reliability and durability, and the diameter and number of steel wires, The structure is capable of diversifying the transverse flat shape and the bidirectional bending strength by corrugating or spiral shape. Further, the carbon content of the wrapping wire is lower than the carbon content of the steel wire by about 0.05 to 0.40 wt%, that is, the wrapping wire is made a relatively moderate soft material to reduce the abrasion of each steel wire. Effectively reduce the wrapping wire into a cross-sectionally flat shape such as an ellipse or an ellipse to increase the contact area with the wrapping wire and effectively reduce the abrasion of each steel strand. It is even higher. In addition, the wrapping wire allows the steel strand to be restrained relatively tightly, and the cord shape can be shaped into a transverse flat shape immediately after bundling, further improving the shape retention performance of the steel strand and eliminating variations. Such as
The reliability of rubber reinforcement is further enhanced.

Further, the corrugations of the steel wires are directed in the major axis direction or minor axis direction of the cord and are arranged in parallel in one plane, or the steel strands are formed in a cross-sectional flat shape such as an ellipse or an ellipse. Compatibility with rubber reinforcement conditions, such as further diversifying the cross-sectional flat shape of the cord and the bending resistance in the two-way direction,
The versatility is further enhanced.

Further, the shape of the tire is bundled by a wrapping wire and the shape thereof is diversified in the cross-sectional flat shape and the bi-directional bending stiffness. Excellent rubber reinforcement performance that accurately corresponds to the rubber reinforcement conditions of the tire belt part,
The rubber reinforcement performance, reliability, and durability are remarkably improved overall, such as reliability. In addition, the cord shape is diversified along with the rubber reinforcing property, and the versatility is remarkably enhanced.

[Brief description of the drawings]

FIGS. 1A and 1B show a code plane and a partial cross-sectional view (A) and an enlarged cross-sectional view (B) showing a first embodiment.

FIG. 2 is a side view and a partial cross-sectional view (A) and an enlarged cross-sectional view (B) of a cord showing a second embodiment.

FIGS. 3A and 3B are a code plane and a partial cross-sectional view (A) and an enlarged cross-sectional view (B) showing a third embodiment.

FIG. 4 is a side view and a partial cross-sectional view (A) and an enlarged cross-sectional view (B) of a cord showing a fourth embodiment.

FIG. 5 is a side view and a partial cross-sectional view (A), an enlarged cross-sectional view (B), and an enlarged cross-sectional view (C) of another modification of the cord according to the fifth embodiment.

FIG. 6 is a side view and a partial cross-sectional view (A), an enlarged cross-sectional view (B), and an enlarged cross-sectional view (C) of a cord according to a sixth embodiment.

FIG. 7 is a side view and a partial cross-sectional view (A), an enlarged cross-sectional view (B), and an enlarged cross-sectional view (C) of a cord according to a seventh embodiment.

FIG. 8 is a side view and a partial cross-sectional view (A), an enlarged cross-sectional view (B), and an enlarged cross-sectional view (C) of another modification of the cord according to the eighth embodiment.

FIG. 9 is a plan view mechanism diagram showing one manufacturing apparatus of the convergent steel cord of the present invention.

FIG. 10 shows the cord elongation of the convergent steel cord of the present invention.
FIG. 4 is a comparative characteristic diagram of a load.

[Explanation of symbols]

 1a-1c Steel wire (transverse circular shape) 11a-11c Steel wire (transverse flat shape) 2 Wrapping wire (transverse circular shape) 12 Wrapping wire (transverse flat shape) c1 Carbon content (steel wire) c2 Carbon content ( Wrapping wire) P Pitch X Long diameter direction Y Cord long direction Z Short diameter direction

Claims (6)

[Claims] 1. A plurality of corrugated or spirally formed steel wires are arranged in a plane without twisting them at least in different pitch phases, and a wrapping wire is wound around the entire steel wires and bound. In a convergent steel cord for rubber reinforcement, when the carbon content of the steel strand is c1 wt%, the carbon content c2 wt% of the wrapping wire is configured to be 0.05 ≦ c1−c2 ≦ 0.40. Convergent steel cord for rubber reinforcement. 2. A plurality of steel strands formed in a corrugated or spiral shape are arranged in a plane without twisting them with at least different pitch phases, and a wrapping wire is wound around the entire steel strand and bundled. A converging steel cord for rubber reinforcement, wherein the wrapping wire is formed in a cross-sectional flat shape such as an ellipse or an ellipse. 3. The convergent steel cord for rubber reinforcement according to claim 1, wherein the wrapping wire is formed in a transverse flat shape such as an ellipse or an ellipse. 4. The rubber reinforcing convergent steel cord according to claim 1, wherein the steel strand is formed in a transverse flat shape such as an ellipse or an ellipse. Convergent steel cord for 5. The convergent steel cord for reinforcing rubber according to claim 1, 2, 3, or 4,
Convergent steel cords for rubber reinforcement, wherein the corrugations of the steel strands are oriented in the major axis direction or minor axis direction of the cord and are arranged in parallel in one plane. 6. The converging steel cord for reinforcing rubber according to claim 1, 2, 3, 4, or 5, wherein the converging steel cord for reinforcing rubber is used as a rubber for a tire belt portion. Convergent steel cord / rubber composite characterized by being buried in parallel.