JPH07145578A - Patterned strand-bound cord and vehicle tire - Google Patents

Abstract

PURPOSE:To produce a suitable reinforcing material for a tire belt layer by using strands having mutually different patterns, parallelly arranging them on one plane, intertwisting and binding them so as to improve its high tension and durability and giving directionality to the flexural stiffness of the cord. CONSTITUTION:A planar-wave shape or a spiral shape is applied to two or more strands 1a to 1d, 11a to 11c respectively and the respective strands are designed so as to be different in phase, pitch (p) or height (h) of patterning respectively. The strands are parallelly arranged on one plane X-X in a non- twisted state and bound to form non-contact parts (alpha) and contact parts (beta) alternately in the longitudinal direction of the cord. A part of non-contact parts are formed at the entangled part (beta) of the strand to form patterned bound cords 3 and 13 which are formed into bound strand bundles respectively. Further, the bound strand bundles 1a to 1d, 11a to 11c are bundled by wrapping wires 2 and 12 and the resultant bundled cords of the patterned strands are arranged in one direction and buried in a tire belt layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applied as a rubber / cord composite for various vehicle tires, conveyor belts, etc.
Particularly, the present invention relates to a shaped element wire converging cord suitable as a reinforcing material for a tire belt layer and a vehicle tire.

[0002]

2. Description of the Related Art Conventionally, a reinforcing material applied to a tire belt layer in various vehicle tires is formed by twisting a plurality of brass-shaped strands, and if necessary, forming an elliptical cross-section. Open steel cords with a 1xn structure in which a gap is formed between the strands to enhance rubber permeability are common, and multiple strands are spirally shaped and untwisted and parallel. , A shaped strand-converging cord (Japanese Examined Patent Publication No. 57-14310) that prevents the separation with rubber and is embedded in the tire belt layer in parallel and a plurality of strands are parallel to each other on one plane. A wire converging cord (Japanese Patent Application No. 60-287958), which has been arranged in the center of the cord and is converged with a wrapping wire to improve the fatigue property and steering stability by giving the direction of the cord bending rigidity, has been developed and proposed. There is.

[0003]

In the conventional reinforcing material, the open steel cord having the 1 × n structure has a plurality of strands formed by a buncher stranding machine,
Further, since the twisting process is performed, the plastic working reduces the toughness and tension of the wire, and the twisting increases the cost and limits the rubber permeability and abrasion resistance. Further, there is a problem that the cord bending rigidity required as a reinforcing material for the tire belt layer is not directional in view of steering stability of the vehicle.

Further, the shaped strand-converging cords and the strand-converging cords as described above are bundled without twisting and have advantages such as prevention of lowering of tension (toughness) and cost reduction. However, there is a problem that the rubber penetrability and abrasion resistance are deteriorated by the line contact with

The present invention has been developed to address the above-mentioned problems, and the object of the present invention is to arrange the wires parallel to each other in one plane by changing the shaping mode of the wires. The entanglement converges to improve the durability such as high tensile strength, fatigue resistance, corrosion resistance, wear resistance, etc., and directionality is added to the cord bending rigidity, making it suitable as a reinforcing material for the tire belt layer to improve ride comfort and vehicle maneuverability. (EN) Provided are a shaped strand-converging cord and a vehicle tire which are improved to enable cost reduction.

[0006]

According to the present invention, two or more strands are formed in a plane wave shape, and the forming phase, pitch, or height of each strand is changed without twisting. They are arranged parallel to each other on a plane and converge to form non-contact parts and contact parts alternately with each other in the cord length direction, and at least a part of this contact part is formed into a wire entanglement part and converges. A cord-shaped strand-converging cord configured into a bundle of strands, which prevents tension drop, enhances rubber penetration and adhesion, reduces wear, and adds directionality to the flexural rigidity of the cord to reinforce the tire belt layer. As a code characteristic is enhanced.

Further, in the shaped strand converging cord, each of the strands is shaped like a spiral instead of a plane wave to form a non-contact portion or an entangled portion of the strand, and a direction of bending rigidity of the cord. By further improving the characteristics such as addition, forming a plurality of strands in the above-mentioned strands in a different shape from other strands, simplifying and arranging the code shape, The cords are bundled with a ping wire to further improve the shape retention of the cord, and further improve the reliability of the driving characteristics such as the above-mentioned cord characteristic and corner link.

Further, a vehicle tire in which the above-mentioned shaping filament converging cords are aligned and embedded in a tire belt layer is provided to enhance the riding comfort and maneuverability of the vehicle.

[0009]

The shaped filament converging cord of the present invention forms each filament only by the shaping mechanism, and when it is converged or straightened thereafter, it is not plastically worked to have a high tension, and has excellent bending fatigue resistance. Having the plane wave-shaped strands without twisting, arranged parallel to each other on one plane, alternately forming non-contact portions and contact portions, and forming a part of the contact portions in the strand-entangled portion. As a bundle of strands, the strands are entangled to maintain the shape as a cord, which significantly enhances rubber penetration and reduces fretting wear between the strands to improve durability.

In addition, each wire is formed into a spiral shape instead of a plane wave shape to form a non-contact portion or a wire entanglement portion and to add a directionality of the bending rigidity of the wire to further improve the cord characteristics. Forming multiple strands of a different type from other strands, simplifying and arranging the cord shape, bundling the converged strand bundle with a wrapping wire, and further improving the cord shape retention property. It is getting higher.

[0011] Further, when the direction of cord bending rigidity having a relatively high rigidity in one direction and a flexibility in the right direction is added and the cords are buried in the tire belt layer by aligning them, the flexibility causes bending fatigue. The ride stability and ride comfort are enhanced, and the rigidity enhances handleability such as cornering, resulting in excellent vehicle operation stability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (A) is a first practical example of the shaped strand converging cord of the present invention, FIG. 1 (B) is a second practical example, FIG. 2 is a cord manufacturing apparatus of the first practical example, and FIG. The code production apparatus of the second practical example is shown in FIG. In FIG. 1, 1a to 1d are brass wires, 2 is a wrapping wire, α is a non-contact portion formed with a gap between the wires, and β is an appropriate entanglement deformation between the non-contact portions. The contact portions of the formed wire, that is, the wire entanglement portion 3 and 3 are the shaped wire convergence cords of the first embodiment.
The first embodiment shown in FIG. 1 (A) is an embodiment in which four strands are shaped into a plane wave, and four strands 1a are formed.
1d are shaped in a plane wave shape, and the phase of shaping of each wire is changed as shown in the drawing to form one plane X-without twisting.
The wires are arranged in parallel on X and converge to form non-contact portions α and contact portions β alternately with each other in the cord length direction, and
At least a part of the contact portion is formed in the wire entanglement portion β to form the shaped wire bundle converging code 3.

The shaping strand convergence code 3 will be described in more detail. For example, the code manufacturing apparatus 1 shown in FIG.
Manufactured by 0. This cord manufacturing device 10 has 3
A bobbin 4 with a brake mechanism 4a for feeding a single strand is provided, and each strand 1a to 1c passes through a capstan 5 and is shaped two-dimensionally by a shaping mechanism 6 with a shaping tooth 6a (corrugation direction YY, 1) (see the dotted line in the cross-sectional view of FIG. 1A)
That is, it is shaped into a plane wave shape (including a square wave shape, a square shape, etc.) and fed to the focusing table 7.

The shaping mechanism 6 changes at least the rotational phase in the direction of the arrow, or changes the shaping teeth 6a of the shaping mechanism 6 to have a different shape as required to shape each of the strands 1a to 1c. It is possible to perform various shaping processes by changing only the phase (see the side view of FIG. 1A) or changing the pitches P1a to P1d or the height h thereof. In the converging table 7, the strands 1a to 1c shaped in a plane wave shape are arranged without twisting in parallel on a plane XX (corrugation direction YY of each strand is the direction of convergence X). -X are aligned orthogonally to each other (see the cross-sectional view of FIG. 1A) and converged, and then straightened and shaped by each straightening roll 8a of the straightening machine 8 shown in the drawing to form converged strand bundles 1a to 1c. Then, the shaped filament converging cord 3 is manufactured and continuously wound around the bobbin 9 through the capstan 5.

The converging table 7 and the straightening machine 8 appropriately press the converged filament bundles 1a to 1c in the X-X direction and the Y-Y direction shown in FIG. The non-contact portion α and the contact portion β are alternately formed in the cord length direction, and at least a part of the contact portion is formed in the strand-entangled portion β (see the cross-sectional view of FIG. 1A). When the wrapping mechanism 30 shown in FIG. 3 is additionally provided between the focusing table 7 and the straightening machine 8, the wrapping wire 2 can be wound around the converged wire bundles 1a to 1c for rapping (FIG. 1).
(See A).

The second embodiment shown in FIG. 1 (B) is an embodiment in which three strands 11a to 11c are each shaped in a spiral shape, and the shaping strand convergence code of the first embodiment is described. 2, the three strands 11a to 11c are each shaped into the above-mentioned plane wave shape to form a spiral strand-shaped convergent cord 13.

The shaping filament converging cord 13 will be described in more detail. For example, the cord manufacturing apparatus 2 shown in FIG.
Manufactured by 0. This cord manufacturing device 20 has three
The individual strands 11a to 11c are drawn out from the bobbin 14 with the braking mechanism, and the individual strands 11a to 11c are shaped in a three-dimensional direction by a shaping mechanism 15 with a plurality of shaping bars 15a via capstans. It is shaped like a sheet and sent to the focusing table 16.

The shaping mechanism 15 changes the corrugating function of the shaping bar 15a and the rotation speed indicated by the arrow to change the strands 11a to 11c.
In the above, the shaping phase is changed only, or the shaping pitches are changed to P11a, c and P11b, or the heights thereof are changed to ha, c and hb, and various spiral shapes are sent to the focusing table 16. . In the illustrated example, the strands 11a and 11c are formed by similar shaping pitches P11a, c, height ha,
In addition to shaping into a shaping group different from other strands 11b (pitches P11b, height hb), the shaping phase of each strand 11a to 11c is changed as shown in FIG. It is in the mode of sending to 16 (Fig. 1
(See B).

Further, the converging table 16 is formed by twisting the spirally shaped wires 11a to 11c without twisting to form a flat plane XX.
The wire bundles 11a to 11c are arranged parallel to each other and converged.
Is sent to the straightener 8 through the wrapping mechanism 30. The wrapping mechanism 30 has a shaft tube 31 through which the wire bundles 11a to 11c are inserted, and the motor 3 is attached to the shaft tube 31.
From the bobbin 33 whose rotation is controlled by 5 to the guide roller 34
The wrapping wire c fed out through the wrapping mechanism is sent to the straightening machine 8 through the wrapping mechanism 30. Lapping mechanism 30
Has a shaft tube 31 through which the wire bundles 11a to 11c are inserted, and the wrapping wire 12 fed from a bobbin 33 mounted on the shaft tube 31 and controlled to rotate by a motor 35 through a guide roller 34 to the wire bundles 11a to 11a. Wrap around 11c and wrap. The wrapping pitch P12 (P2) is adjusted by controlling the rotation in accordance with the transfer speed of the wire bundles 11a to 11c. Further, the straightening machine 18 straightens and shapes the converged and wrapped filament bundles 1a to 1d by the straightening roll 18a to produce the converged filament bundles 11a to 11c, that is, the shaped filament converging cord 13, and passes through the capstan. It is continuously wound around the bobbin 19. The converging table 16 and the straightening machine 18 appropriately press the filament bundles 11a to 11c in the illustrated XX and YY directions to contact the shaped filament converging cord 13 with the non-contact portion α. The parts β are alternately formed in the cord length direction, and at least a part of the contact part is formed in the strand-entangled part β (see the cross-sectional view of FIG. 1B).

Further, each of the shaping element convergence codes 3,
13 is, for example, embedded in a calendar sheet by aligning it, and specifically, by aligning the XX direction of its convergence with the plane of the calendar sheet and embedding by aligning, a tire belt layer is constituted by this calendar sheet. It is applied as a vehicle tire (not shown).

The shaped strand convergence codes 3 and 13 are as follows.
The respective strands 1a to 1c and 11a to 11c are shaped by the shaping mechanisms 6 and 15 respectively, and then the converging bases 7 and 1 are formed.
6 and the straightening machines 8 and 18 do not perform any plastic working in the straightening and straightening, so the plastic working of each wire is reduced and the deterioration of its toughness is effectively reduced, and its tension is 3800MP.
The bending fatigue resistance is remarkably enhanced by ensuring a value of a or more.

Further, the individual wires are shaped into the above-mentioned plane wave shape or spiral shape, arranged without twisting in parallel on one plane XX and converged, and the wires do not contact each other with the non-contact portion α. Contact part β
Are formed alternately in the cord length direction, and at least a part of the contact portion is formed in the wire entanglement portion β (see FIGS. 1A and 1B). Is obtained efficiently and at a low cost, the non-contact part (gap) α is not particularly reduced when the cord is stretched and bent, and the wire entangled part β is reduced. The durability is significantly improved as well as the fretting wear between the wires is significantly reduced.

Further, when each strand is formed in a spiral shape, the cord characteristics such as the formation of the non-contact portion and the entangled portion of the strand and the addition of the directionality of the bending rigidity of the strand are further enhanced. Forming the strands of No. 3 into a shape or group different from other strands simplifies and arranges the cord shape, and bundling the converged strand bundle with a wrapping wire further improves the cord shape retention. , The stability of quality is further enhanced.

Further, the cross-sectional shape shown in FIGS. 1 (A) and 1 (B) is formed, and the Y-Y direction shown in the drawing is relatively flexible and the X-X direction is relatively excellent in rigidity. When the tire belt layer is aligned and embedded in the tire belt layer with the XX direction being the layer surface direction and the YY direction being the orthogonal direction (tire contact direction), the flexibility in the YY direction is obtained. Good bending stress is given to improve the bending fatigue property and the riding comfort, and the steering property is improved due to the rigidity in the XX direction.

Further, the cords 3 and 13 are formed to have a substantially flat cross section as shown in FIG. 1, and the flatness of the calender sheet can be appropriately adjusted by adjusting the molding height and correction of each wire. It can be adjusted thinly so that it can be adjusted.
It is extremely effectively applied as a reinforcing material in a tire belt layer of a vehicle tire. In addition, it is widely used as various other rubber reinforcing materials.

In each of the shaping strand convergence codes described above,
The number of strands is at least 2 or more, preferably 2 to 8
It is composed by converging books, all the wires are shaped in the same way and only their phases are changed to converge, or each wire is changed in pitch or height of different shapes, or When the number of strands is 3, two and one are shaped differently as shown in FIG. 1 (B), and when the number of strands is 4, each two are shaped differently. In the case of five wires, two wires and three wires may be shaped differently, or a combination of a plane wave shaped shaping wire and a spiral shaped shaping wire may be possible, and various configurations are possible. Furthermore, the wire diameter is 0.05 ~
0.4 mm, preferably 0.15 to 0.4 mm is applied, and the illustrated rat pink wires 2 and 12 have a smaller diameter than the strands, but may have the same diameter if necessary. used.

For example, in the case of forming four wires, a wire having a diameter of 0.20 mm or 0.22 mm is shaped to form a pitch P.
12 mm, 10 mm, and the shaping height h is 0.04 mm, 0.0
It is shaped into 6 mm and manufactured into the above shaped wire converging cord. The cord tension is 3900 MPa, bending fatigue is remarkably improved, and the protruding deformation of the wire and rubber separation are not particularly recognized. Have characteristics.
Further, as a result of manufacturing and testing various samples, the forming pitch P of each wire is 23d ≦ P ≦ with respect to the wire diameter d as being different for each wire or for each group as described above.
It is preferable to set it within the range of 60d, and the shaping height h of each wire is different for each wire or for each group, and is 1.01d ≦ h ≦ 2.00d with respect to the wire diameter d. It is preferable that the winding pitch P of the ratchet wire in the outer layer is the diameter D of the ratpink wire.
Then, it is preferable to set it within the range of 23D ≦ P ≦ 60D, and the above-mentioned actions and effects have been confirmed in these numerical ranges.

[0028]

As described above, the shaped strand-converging cord and the vehicle tire of the present invention have a high tensile strength in which the strands are twisted and reduced with a degree of shaping, and have excellent bending fatigue without twisting. The non-twisted parallel strands of each plane-wave shaped element are arranged in parallel on one plane to form non-contact portions and contact portions alternately with each other, and a part of this is formed in the wire-entangled portion. As a bundle of strands, the rubber penetration is increased to reduce the fretting wear between the strands and the durability is improved.In addition, each strand is shaped like a spiral to form non-contact parts and strand entanglements and cords. Cord characteristics such as improving the directionality of bending rigidity, simplifying the cord shape by grouping only a plurality of strands and grouping the bundled bundle of strands with a wrapping wire to further enhance the cord shape retention, The quality stability is significantly improved.

In addition, the directionality of the cord bending rigidity, which is excellent in rigidity in one direction and has flexibility in the right direction, is added,
By embedding it as a reinforcing reinforcement in the tire belt layer, its flexibility enhances bending fatigue and riding comfort, and its rigidity enhances handleability such as cornering, resulting in excellent vehicle operation stability. It functions extremely effectively as a reinforcing material in the tire belt layer of an automobile tire, and has significantly improved driving reliability. Further, there is an effect that it can be easily and efficiently manufactured by a simple process and provided at low cost.

[Brief description of drawings]

FIG. 1 is a sectional side view / mechanism view (A) showing a first embodiment of the present invention, and FIG.

FIG. 2 is a side view mechanism view (A) of the cord manufacturing apparatus according to the first embodiment and an enlarged side view view (B) of a main part of the shaping mechanism.

FIG. 3 is a side view mechanism diagram of a cord manufacturing device according to a second embodiment.

[Explanation of symbols]

 1a to 1d, 11a to 11c Elementary wire 2,12 Lapping wire 3,13 Shaped elemental wire convergence code XX One plane P Shaped pitch h Shaped height α Non-contact part (gap forming part) β Contact part ， Wire entanglement part

Claims (5)

[Claims] 1. Two or more strands are respectively shaped in a plane wave shape, and the strands are arranged in parallel on one plane without twisting by changing the phase, pitch, or height of the shaping of each strand. Converging, forming non-contact portions and contact portions alternately with each other in the cord length direction, and forming at least a part of the contact portion into a wire entangled portion to form a converged wire bundle. Shaped strand convergence code characterized by. 2. The shaped strand convergence code according to claim 1, wherein each of the strands is shaped in a spiral shape instead of a plane wave shape. 3. The shaped strand convergence code according to claim 1 or 2, wherein a plurality of strands in the strands are formed in a different shape from other strands. Shaped element convergence code. 4. The shaping element wire converging code according to claim 1, claim 2 or claim 3, wherein the converged element wire bundles are bundled with a wrapping wire. code, 5. The shaped filament converging cord according to claim 1, claim 2, claim 3 or claim 4, wherein the shaped filament converging cords are aligned and embedded in a tire belt layer. Characteristic vehicle tires.