JP6238706B2 - Pneumatic tire and manufacturing method thereof - Google Patents

Description

  The present invention relates to a pneumatic tire and a method for manufacturing the same.

Conventionally, as Patent Document 1, a tire belt (reinforcing member) having a configuration in which another wire coil is wound from two directions intersecting with a plurality of wire coils arranged in parallel in the longitudinal direction is known. .
Patent Document 2 discloses a tire belt having a configuration in which a plurality of belt cords extending in three intersecting directions are woven together.
Patent Document 3 discloses a tire belt made of a thin metal plate having a mesh structure.

However, in Patent Document 1, since only the other wire coil that intersects the wire coil extending in the longitudinal direction is tangled, there is a possibility that it may be slidably contacted with each other and may be broken in some cases. In particular, when a resin material is used for the wire coil for weight reduction, this problem becomes remarkable.
In Patent Document 2, as in the case of Patent Document 1, the belt cords are slidably contacted with each other and worn, and in some cases, the belt cord may be broken.
Moreover, in patent document 3, since the whole is comprised with the single thin metal material, there exists a possibility that it may fracture | rupture, when an external force concentrates on the part when the built-in tires run on a curbstone.

JP-A-1-237203 JP-A-5-162508 JP 2000-25412 A

  This invention makes it a subject to provide the pneumatic tire provided with the belt which was lightweight and excellent in durability, and its manufacturing method.

As a means for solving the above problems, the present invention provides:
A pneumatic tire with a belt in the tread,
The belt is
A substrate including a plurality of wires arranged to extend in a specific direction at intervals,
The base material includes a plurality of polygonal portions repeatedly formed in two dimensions,
Each polygonal part is defined by a threaded part and a single line part;
Each of the threaded portions is formed by twisting two or more wires arranged adjacent to each other among the wires,
Each said single wire part provides the pneumatic tire which is one side of the wire which comprises the said screwing part.

  With this configuration, it is possible to effectively prevent rubbing between the wires at the screwed portion formed by twisting the wires twice or more. Therefore, it is possible to greatly reduce the possibility that the wires are rubbed and broken due to wear. In addition, the polygonal portion can increase multidirectional rigidity. Furthermore, since the polygonal part is merely formed continuously on the same plane, it is not necessary to make it multi-layered, and the weight can be reduced. That is, the weight can be reduced while maintaining the durability of the belt.

  It is preferable that the belt has a belt-like base material, and both side portions are constituted by vertical wires extending in the longitudinal direction.

  With this configuration, it is easy to maintain the belt in a stable shape with the vertical wires on both sides of the base material, and the rigidity balance can be improved.

  In the belt, it is preferable that the base material includes three or more of the vertical wire rods, and a plurality of polygonal portions are formed in each divided region between the vertical wire rods.

  With this configuration, the rigidity in each divided region can be changed so as to be appropriate for the belt.

The belt is preferably the shape of each polygonal portion constituting the base material that has different.

  With this configuration, even if the required rigidity has directionality, it can be dealt with by changing the shape of the polygonal portion accordingly. For example, it may be formed so as to be short in a direction where rigidity is required and long in a direction where rigidity is not required.

  It is preferable that the belt is formed by arranging polygonal portions having different shapes between the divided regions.

  With this configuration, the level of rigidity in each divided region can be set to a value suitable for the belt.

  Three vertical wires are provided, a first divided region and a second divided region are formed between the vertical wires, and the first divided region is positioned inside in a state of being mounted on a vehicle. It is preferable that the two divided regions are positioned outside and the honeycomb density of the polygonal portion of the second divided region is larger than that of the first divided region.

  With this configuration, it is possible to improve cornering performance by the second divided region whose rigidity is higher than that of the first divided region while improving the riding comfort during vehicle travel in the first divided region.

  The belt may be adjustable as long as the shape of the polygonal portion is changed by changing the pitch of the threaded portion.

  The belt may be adjusted so that the pitch of the threaded portions can be adjusted by changing the number of times of twisting between the wires, the inclination angle of the single wire extending from the threaded portions, or the interval between adjacent wires.

The belt may further include a covering portion that coats the entire base material.
The polygonal part may be a quadrangle or a hexagon.

As a means for solving the above problems, the present invention provides:
A pneumatic tire with a belt in the tread,
The belt is
A threaded portion formed by twisting wires together;
A single wire portion formed from one of the wires extending from the threaded portion;
Comprising a base material formed by continuously forming a polygonal part surrounded by the same plane,
The threaded portion of the base material is formed by twisting two wire materials two or more times.

  With this configuration, it is possible to effectively prevent rubbing between the wires at the screwed portion formed by twisting the wires twice or more. Therefore, it is possible to greatly reduce the possibility that the wires are rubbed and broken due to wear. In addition, the polygonal portion can increase multidirectional rigidity. Furthermore, since the polygonal part is merely formed continuously on the same plane, it is not necessary to make it multi-layered, and the weight can be reduced. That is, the weight can be reduced while maintaining the durability of the carcass ply.

  According to the present invention, a tire belt is provided with a base material composed of a plurality of polygonal portions surrounded by a threaded portion and a single wire portion, and the twisted portion is twisted between two wire rods two or more times. Since it is configured, there is almost no rubbing between the wires, so there is no fear of cutting due to wear. Therefore, durability of the belt can be improved and desired performance can be exhibited over a long period of time. Further, even if the belt is constituted by one sheet, sufficient rigidity can be ensured, so that the weight can be reduced.

It is a fragmentary sectional view of the pneumatic tire concerning this embodiment. It is a perspective view of the belt of FIG. It is a top view of the base material shown in FIG. It is an enlarged view of one polygon part shown in FIG. It is a top view of the base material which shows the modification of FIG. It is a top view of the base material which shows the modification of FIG. It is a top view of the base material which shows the modification of FIG. It is a top view of the base material which shows the modification of FIG. It is a top view which shows the base material of the belt which concerns on 2nd Embodiment. It is a top view which shows the base material of the belt which concerns on 3rd Embodiment. It is a top view which shows the base material of the belt which concerns on 4th Embodiment.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In addition, the following description is only illustrations essentially and does not intend restrict | limiting this invention, its application thing, or its use.

  FIG. 1 is a partial cross-sectional view of a pneumatic tire according to this embodiment. In this pneumatic tire, the external structure includes a tread portion 11, a shoulder portion 12, a side portion 13, and a bead portion 14. The internal structure includes a belt 15 provided from the tread portion 11 to the shoulder portion 12. A reinforcement ply 16 is provided on the outer peripheral side of the belt 15. A carcass 17 is provided on the inner peripheral side of the belt 15. The carcass 17 is directed from the tread portion 11 to the bead portion 14 and is turned back by the bead core 18 incorporated therein to reach the outer surface side. In FIG. 1, the other members are omitted.

(First embodiment)
FIG. 2 shows the belt 15 according to the first embodiment. The belt 15 is formed in a sheet shape by covering the surface of the substrate 2 with the covering portion 3.

  As shown in FIG. 3, the base material 2 is formed in a sheet shape by twisting a plurality of wire rods 4 at predetermined positions to form a plurality of polygonal portions 5.

  For the wire 4, a metal material such as steel, a resin material made of organic fibers such as polyester, aramid, rayon, nylon, or the like can be used. Each wire 4 may be configured by one, but may be configured by bundling or twisting a plurality of thinner wires.

  The base material 2 is formed by arranging a plurality of wire rods 4 in the vertical direction (longitudinal direction) and twisting adjacent wire rods at a predetermined pitch in the vertical direction. That is, a polygonal portion 5 surrounded by a screwed portion 6 in which adjacent wire rods are twisted together and a single wire portion 7 made of one wire rod 4 extending from the screwed portion 6 is formed. Here, the polygon part 5 is comprised by the regular hexagon. In addition, the twisted portion 6 is formed by twisting the wire materials two or more times. Here, the threaded portion 6 is formed by twisting the wire members twice and a half (in FIG. 2, a circular space is shown at the center position of the threaded portion 6, but this is the twisted state. This is to make the state easy to understand, and no space is actually formed.) The wire 4 (vertical wire 8) on both sides is used while extending straight in the vertical direction. The polygon part 5 is continuously formed on the same plane between the vertical wires 8 and constitutes a honeycomb form.

  As shown in FIG. 4, a detailed description will be given focusing on one polygonal portion 5. The polygonal portion 5 includes a first single wire portion 7A composed of a first wire rod 4A that branches off from a threaded portion 6 in which two adjacent wire rods 4 are twisted together, and a second single wire composed of a second wire rod 4B. Part 7B. Moreover, it has the 1st screw part 6A which twisted together the 3rd wire 4C adjacent to the 1st wire 4A and this 1st wire 4A on the opposite side to the 2nd wire 4B. Furthermore, the second wire rod 4B and a second threaded portion 6B in which the fourth wire rod 4D adjacent to the second wire rod 4B on the opposite side to the first wire rod 4D is twisted. Furthermore, it has the 3rd single wire part 7C which consists of the 1st wire 4A branched from the 6th screw part 6A, and the 4th single wire part 7D which consists of the 2nd wire 4B branched from the 2nd screw part 6B. The third single wire portion 7C and the fourth single wire portion 7D are twisted together to form the screwed portion 6.

  The shape of the polygonal portion 5 can be changed to a vertically long shape or a horizontally long shape by changing the threaded portion pitch, that is, the honeycomb density. Here, as shown in FIG. 3, the threaded portion pitch refers to a longitudinal pitch P1 that is a distance between the longitudinally threaded portions 6 (here, the distance between the center positions) and a laterally threaded portion 6. Means a horizontal pitch P2.

  The adjustment of the vertical pitch P1 can be performed by increasing / decreasing the number of times the screwing portion 6 is screwed or by adjusting the inclination angle of the single wire portion 7.

  As the number of times of screwing of the screwed portion 6 is increased, it can be configured such that the wires are less likely to rub against each other. However, as described above, it may be two or more times enough to prevent the wires from being rubbed during use. By adjusting the number of times of screwing, the length of the screwing portion 6 can be changed to adjust the vertical pitch P1. For example, as shown in FIG. 7, each regular hexagon can be made into a vertically long shape by increasing the number of times of screwing, or it can be made into a horizontally long shape (not shown) by reducing the number of times of screwing. it can.

  The vertical pitch P1 can also be adjusted by changing the inclination angle of the single wire portion 7 extending from the threaded portion 6 (inclination angle θ of the single wire portion 7 with respect to the vertical direction (vertical direction) in FIG. 3). In FIG. 5, the inclination angle with respect to the screwed portion 6, that is, the inclination angle θ with respect to the vertical direction is increased to form a horizontally long shape. In FIG. 6, the inclination angle with respect to the screwed portion 6, that is, the inclination angle θ with respect to the vertical direction is reduced to form a vertically long shape.

  The adjustment of the lateral pitch P2 can be performed by adjusting the interval of the wire 4. That is, the polygonal part 5 can be made horizontally long by widening the interval between the wire rods 4 and can be made vertically long by making it narrow.

  In this way, the regular hexagon can be adjusted to either a vertically long shape or a horizontally long shape by increasing or decreasing the number of times of screwing of the screwing portion 6 or adjusting the inclination angle θ of the single wire portion 7. By adopting a vertically long shape, the rigidity in the vertical direction can be reduced compared to the horizontal direction. On the other hand, by adopting a horizontally long shape, the rigidity in the horizontal direction can be reduced compared to the vertical direction.

  Moreover, the shape of the polygonal part 5 of the base material 2 is not limited to a hexagon (including a regular hexagon, and a vertically long or a horizontally long hexagon), and may be a square shown in FIG. In other words, the length of the single wire portion 7 can be made to be a quadrangle by sufficiently increasing the length of the single wire portion 7 with respect to the screwed portion 6. In FIG. 8, the polygonal part 5 has a rhombus shape.

  The base material 2 having the above-described structure becomes the belt 15 by forming the covering portion 3 by coating with a thin rubber (topping rubber) (not shown) or by thermally welding a film-like synthetic resin.

  In the tire provided with the belt 15 having the above-described configuration, the two belts that have conventionally been required can be completed with one belt, and the weight can be reduced. In addition, since the twisting portions 6 between the wire rods are twisted together at the number of times of twisting two times or more, the wire rods are not rubbed in use (running with a tire). Therefore, there is no fear that the wire 4 is damaged due to wear and cut.

(Second Embodiment)
FIG. 9 shows a belt 15 according to the second embodiment. The belt 15 is configured to have three divided regions (first divided region 9A, second divided region 9B, and third divided region 9C) by providing four vertical wires 8. A plurality of polygonal portions 5 are formed in each divided region, and the polygonal portion 5 formed in the second divided region 9B and the polygonal portions formed in the first divided region 9A and the third divided region 9C. 5 and the shape is different. That is, the polygonal portion 5 of the second divided region 9B is formed in a regular hexagon, whereas the polygonal portion 5 of the first divided region 9A and the third divided region 9C is a vertically long (narrow) hexagon. Is formed. Here, when the lateral pitch P2 in the tire width direction is P2a in the first divided region 9A, P2b in the second divided region 9B, and P2c in the third divided region 9C, P2b> P2a, P2c (P2a and P2c are equal) Or they may be different.) As a result, the honeycomb density becomes coarse at the center of the belt 15 in the tire width direction and becomes dense on both sides.

  FIG. 10 shows a belt 15 according to the third embodiment. Similar to the belt 15 according to the second embodiment, the belt 15 is provided with four vertical wires 8 to form three divided regions (first divided region 9A, second divided region 9B, and third divided region 9C). ). A plurality of polygonal portions 5 are formed in each divided region. However, in contrast to the second embodiment, the polygonal portion 5 formed in each divided region is formed as a regular hexagon in the first divided region 9A and the third divided region 9C, whereas The difference is that the divided region 9B is formed in a vertically long (narrow) hexagon. Here, when the lateral pitch P2 in the tire width direction is P2a in the first divided region 9A, P2b in the second divided region 9B, and P2c in the third divided region 9C, P2a, P2c> P2b (P2a and P2c are equal) Or they may be different.) As a result, the honeycomb density is coarse on both sides of the belt 15 in the tire width direction, and dense at the center.

  FIG. 11 shows a belt 15 according to the fourth embodiment. This belt 15 is configured to have two divided regions (first divided region 9A and second divided region 9B) by providing three vertical wires 8. A plurality of polygonal portions 5 are formed in each divided region. In the first divided region 9A, the polygonal part 5 is formed in a regular hexagon, and in the second divided region 9B, it is formed in a vertically long (narrow) hexagon. Here, when the lateral pitch P2 in the tire width direction is P2a in the first divided region 9A and P2b in the second divided region 9B, P2a> P2b. When the pneumatic tire provided with such a belt 15 is mounted on a vehicle and used, the first divided region 9A in which the honeycomb density is coarse on the inside (the second divided region 9B that is dense on the outside). Use with the position.

An actual vehicle feeling test was performed using the pneumatic tire including the belt of the comparative example and the pneumatic tire including the belt of the example according to the present invention. Specifically, the size is 195 / 65R15 91H, air pressure using the pneumatic tire 180 kPa, were evaluated for durability and road noise (R / N). These values shown below show indices when Comparative Example 1 or 2 is taken as 100 .
The durability, conforming to JIS D4230, performs tire strength (breaking energy) test was indexed measurements. It shows that it is excellent in durability, so that a numerical value is large.
Road noise (R / N) is an OAL (overall) index measured at the position of the driver's ear on the window side when traveling on a paved good road test course at a speed of 100 km / h. The smaller the value, the better the performance.

比較例１：従来構成のベルトを２枚備えた空気入りタイヤ
比較例２：長手方向に並設した複数本のワイヤコイルに対して交差する２方向から他のワイヤコイルをからげたもの（特開平１−２３７２０３号公報参照）
比較例３：交差する３方向にそれぞれ延びる複数本のベルトコードを織り合わせたもの（特開平５−１６２５０８号公報参照）
実施例１：図３に示すベルト（第１実施形態）
実施例２：図６に示すベルト
実施例３：図９に示すベルト（第２実施形態）
実施例４：図１０に示すベルト（第３実施形態）
実施例５：図１１に示すベルト（第４実施形態）

Comparative Example 1: Pneumatic tire with two conventional belts Comparative Example 2: Another wire coil is wound from two directions intersecting a plurality of wire coils arranged in parallel in the longitudinal direction (See 1-237203)
Comparative Example 3: A combination of a plurality of belt cords extending in three intersecting directions (see JP-A-5-162508)
Example 1: Belt shown in Fig. 3 (first embodiment)
Example 2: Belt shown in FIG. 6 Example 3: Belt shown in FIG. 9 (second embodiment)
Example 4: Belt shown in FIG. 10 (Third Embodiment)
Example 5: Belt shown in FIG. 11 (fourth embodiment)

As is apparent from Table 1, it was possible to improve the durability as compared with Comparative Example In either embodiment. In Examples 3 and 5, road noise could also be reduced. This is because, by making the honeycomb structure of the shoulder portion 12 dense, vibration of the tire cross section due to vibration during tire running, in particular, a deformation mode in which the tread portion and the sidewall portion are in phase and the shoulder portion 12 vibrates in reverse phase ( In the secondary cross-section mode), it is considered effective to suppress the antinode portion (shoulder portion 12).

  In addition, this invention is not limited to the structure described in the said embodiment, A various change is possible.

  For example, in the above embodiment, the belt is composed of one layer, but it may be composed of two or more layers.

  Moreover, in the said embodiment, although the base material 2 was formed by twisting together the several wire 4 arranged side by side in the predetermined position of the vertical direction between adjacent wires, the diagonal direction which mutually cross | intersects The base material 2 may be formed by twisting together the wire materials extending in the direction of each other.

  Further, in FIG. 8, the base material 2 is formed by two vertical wires 8 to form two divided regions. However, as shown in FIGS. 9 and 10, three divided regions may be formed. Although not shown, five divided regions may be formed. Then, the rigidity may be varied by changing the shape and size of the polygonal portion 5 in each divided region. Note that the number of divided regions is not limited to the number of examples, and the number of divided regions can be freely changed according to the application.

  Moreover, although the polygonal part 5 of each division area was comprised with all hexagons, you may comprise with other polygons, such as a rectangle, like the said 1st Embodiment. Further, the polygonal shape may be different in each divided region. For example, the polygonal portion may be a hexagon in the first divided region and a quadrangle in the second region. Moreover, the length of the screwing part formed in the vertical wire of the boundary part may not be the same, and the position may be shifted in the vertical direction. This is the same regardless of the shape of the polygonal portion.

DESCRIPTION OF SYMBOLS 2 ... Base material 3 ... Coating | coated part 4 ... Wire rod 4A ... 1st wire rod 4B ... 2nd wire rod 4C ... 3rd wire rod 4D ... 4th wire rod 5 ... Polygon part 6 ... Twist part 6A ... 1st twist part 6B ... 2nd screwing part 7 ... Single wire part 7A ... 1st single wire part 7B ... 2nd single wire part 7C ... 3rd single wire part 7D ... 4th single wire part 8 ... Vertical wire 9A ... 1st division area 9B ... 2nd division area 9C ... 3rd division area 11 ... Tread part 12 ... Shoulder part 13 ... Side part 14 ... Bead part 15 ... Belt 16 ... Reinforcement ply 17 ... Carcass 18 ... Bead core

Claims (13)

A pneumatic tire with a belt in the tread,
The belt is
A substrate including a plurality of wires arranged to extend in a specific direction at intervals,
The base material includes a plurality of polygonal portions repeatedly formed in two dimensions,
Each polygonal part is defined by a threaded part and a single line part;
Each of the threaded portions is formed by twisting two or more wires arranged adjacent to each other among the wires,
Each said single wire part is one side of the wire which comprises the said screwing part, The pneumatic tire characterized by the above-mentioned.   2. The pneumatic tire according to claim 1, wherein the belt has a belt-like base material, and both side portions are formed of vertical wires extending in the longitudinal direction.   3. The belt according to claim 2, wherein the belt includes three or more of the vertical wires, and a plurality of polygonal portions are formed in each divided region between the vertical wires. 4. Pneumatic tires. The belt, pneumatic tire according to any one of claims 1 to 3, the shape of the polygonal portion constituting said substrate is that you have different.   5. The pneumatic tire according to claim 4, which is dependent on claim 3, wherein the belt is formed by arranging polygonal portions having different shapes between the divided regions.   The belt includes three vertical wires, and a first divided region and a second divided region are formed between the vertical wires, and the first divided region is positioned on the inner side in a state of being attached to a vehicle. The air according to claim 2, wherein the second divided region is positioned outside, and the honeycomb density of the polygonal portion of the second divided region is larger than that of the first divided region. Enter tire.   The pneumatic tire according to any one of claims 4 to 6, wherein the belt can be adjusted by changing the shape of the polygonal portion to change the pitch of the threaded portion.   In the belt, the pitch of the threaded portions can be adjusted by changing the number of times of twisting between the wires, the inclination angle of the single wire extending from the threaded portion, or the interval between the adjacent wires. The pneumatic tire according to claim 7.   The pneumatic tire according to any one of claims 1 to 8, wherein the belt further includes a covering portion that coats the entire base material.   The pneumatic tire according to claim 1, wherein the polygonal portion is a quadrangle or a hexagon. A pneumatic tire with a belt in the tread,
The belt is
A threaded portion formed by twisting wires together;
A single wire portion formed from one of the wires extending from the threaded portion;
Comprising a base material formed by continuously forming a polygonal part surrounded by the same plane,
The pneumatic tire according to claim 1, wherein the threaded portion of the base material is formed by twisting two wire rods two or more times. A polygonal portion surrounded by a twisted portion formed by twisting wires together two or more times and a single wire portion extending from the screwed portion and made of one of the wires is continuously formed on the same plane. The manufacturing method of the pneumatic tire characterized by including the formation process of the belt provided with the base material to perform. Furthermore, the manufacturing method of the pneumatic tire of Claim 12 provided with the formation process of the belt which coats the whole said base material with a coating | coated part.

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