KR102471064B1 - Tire - Google Patents

Abstract

A tire according to an embodiment of the present invention includes a tread portion; and a belt part disposed inside the tread part, and inside the belt part, a first cord layer disposed in a zigzag pattern along the longitudinal direction of the belt part; and a plurality of second code units arranged alternately with respect to the first code layer.

Description

tire {TIRE}

The present invention relates to a tire, and more particularly, to a tire having improved durability.

In a conventional tire, PET Textile cord is used in the ply part of the body of a pneumatic tire to support the load of the tire and absorb shock. In addition, since the elongation rate is lower than that of nylon, the shape stability of the tire is maintained, and the durability of the tire can be improved by suppressing the growth of the tire due to heat generated from the tire during driving.

On the other hand, a nylon cord with excellent shrinkage is used in the cap ply part of the tire, and it shrinks due to heat generated at high temperatures to suppress the movement of the steel belt part. The cap ply part is located on the outer layer of the steel belt part, and thus, growth of the steel belt part can be suppressed during driving of the tire.

However, since the nylon cord used in the cap ply part has inferior modulus compared to the PET cord, interface breakage between the belt parts may occur due to movement of the steel belt part formed of a plurality of belt parts during tire driving.

More specifically, interface breakage between the belt parts or between the belt part and the cap ply layer may occur due to deterioration in adhesion due to movement of the shoulder part of the steel belt part during driving of the tire. Therefore, it is necessary to improve the durability of the tire through a structure that effectively suppresses the motion of the steel belt part.

An object to be solved by the present invention is to provide a tire that fixes a belt portion and improves durability of the tire.

However, these problems are exemplary, and the problem to be solved by the present invention is not limited thereto.

A tire according to an embodiment of the present invention includes a tread portion; and a belt part disposed inside the tread part, and inside the belt part, a first cord layer disposed in a zigzag pattern along the longitudinal direction of the belt part; and a plurality of second code units arranged alternately with respect to the first code layer.

In the tire according to an embodiment of the present invention, the first cord layer may be formed by arranging a plurality of first cords.

In the tire according to an embodiment of the present invention, the distance between the first cord layer and the upper surface of the belt part and the distance between the first cord layer and the lower surface of the belt part are the plurality of first cord layers forming the first cord layer. It may be shorter than the distance between 1 codes.

In the tire according to an embodiment of the present invention, the first cord layer may further include a plurality of second cords intertwined with the plurality of first cords in a vertical direction.

In the tire according to an embodiment of the present invention, a body ply part may be disposed inside the belt part.

In the tire according to an embodiment of the present invention, the second cord parts may be spaced apart from each other based on the first cord layer.

In the tire according to an embodiment of the present invention, the second cord parts may be spaced apart from each other based on the first cord layer.

In the tire according to an embodiment of the present invention, the belt portion may be integrally formed by rolling.

In the tire according to an embodiment of the present invention, the first cord layer may be formed in a concavo-convex shape.

Other aspects, features, and advantages other than those described above will become clear from the detailed description, claims, and drawings for carrying out the invention below.

In the tire according to an embodiment of the present invention, the movement of the belt part can be minimized by arranging a high-strength PET Textile cord inside the integrally formed belt part.

In addition, in the tire according to an embodiment of the present invention, through a belt part having a structure in which a PET cord layer having excellent modulus characteristics surrounds the steel cord, movement of the belt part is minimized and contact between the steel cords is minimized while the tire is running. It is possible to minimize the destruction of the belt part by preventing it.

In addition, in the tire according to an embodiment of the present invention, an existing cap ply layer and a plurality of belt portions are simultaneously rolled using a single rolling tool to form one belt portion, so that interfaces between the belt portions and the cap ply layers are contacted. can improve the durability of the tire.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a tire according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a tire according to an embodiment of the present invention, taken in part AA′ of FIG. 1 .
Figure 3 is a cross-sectional view showing a belt portion according to an embodiment of the present invention in part B of FIG.
FIG. 4 is a top view showing a first code layer and a plurality of second code units according to an embodiment of the present invention, taken in part C of FIG. 3 .
5 is a view showing a rolling tool in which a belt part is rolled according to an embodiment of the present invention.
6 is a cross-sectional view of a belt part according to another embodiment of the present invention, taken in part B of FIG. 2 .

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the description of the invention. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all conversions, equivalents, or substitutes included in the spirit and scope of the present invention. In describing the present invention, even if shown in different embodiments, the same identification numbers are used for the same components.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when describing with reference to the drawings, the same or corresponding components are assigned the same reference numerals, and overlapping descriptions thereof will be omitted. .

In the following embodiments, terms such as first and second are used for the purpose of distinguishing one component from another component without limiting meaning.

In the following examples, expressions in the singular number include plural expressions unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have mean that features or components described in the specification exist, and do not preclude the possibility that one or more other features or components may be added.

In the drawings, the size of components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown.

In the following embodiments, the x-axis, y-axis, and z-axis are not limited to the three axes of the Cartesian coordinate system, and may be interpreted in a broad sense including these. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

When an embodiment is otherwise embodied, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may proceed in an order reverse to the order described.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

For reference, unless specifically limited in the present specification, the driving direction may correspond to the X-axis direction, the width direction to the Y-axis direction, and the height direction to the Z-axis direction, respectively.

Hereinafter, a tire including a belt part according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

1 is a perspective view showing a tire according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a tire according to an embodiment of the present invention, taken along line A-A' of FIG. 1 .

1 and 2, the tire 100 according to an embodiment of the present invention is a pneumatic tire, and includes a tread portion 110 and sidewalls extending from both sides of the tread portion 110 ( 120), and a bead 130 disposed at an end of the sidewall 120.

In addition, the tire 100 may include a body ply 140 and a belt portion 150 positioned below the tread portion 110 . In addition, the tire 100 may include an inner liner 170 positioned inside the tread portion 110 and the pair of sidewalls 120 to maintain air pressure inside the tire 100 .

The tread part 110 may have a tread block TB partitioned by a plurality of grooves 115 . The tread block TB is a part that comes into contact with the ground during driving of the vehicle, and may be partitioned by a groove that runs around the tire 100 in the radial direction.

The tread part 110 is made of a thick rubber layer and transmits driving force and braking force of the vehicle to the ground.

On the surface of the tread block TB, tread patterns for steering safety, traction, and braking properties and blocks partitioned by the tread patterns may be positioned. The tread patterns may include a plurality of grooves for drainage and sipes for improving traction and braking power when driving on a wet road. The sipe is formed on the tread block and may be a groove having a smaller size than the groove. Sipes can increase the driving force and braking force of the tire 100 by absorbing moisture and breaking the water film when driving on a wet road.

The tread part 110 may include a body ply 140, a belt part 150, and an inner liner 170 therein.

The bead 130 is disposed at an end of the sidewall 120 and serves to mount the tire 100 to the rim 190 . The bead 130 may include a bead core 131 and a bead filler 132 .

The bead core 131 is disposed below the bead filler 132 and may be formed by twisting a plurality of rubber-coated steel bead cords (wires).

The bead 130 includes a bead filler 132 , and the bead filler 132 may be disposed extending from the bead core 131 toward the sidewall 120 . The bead filler 132 is a rubber filler attached to one side of the bead core 131 and serves to reinforce the bead core 131 . In another embodiment, a plurality of bead fillers 132 may have different physical properties.

Bead 130 may have a plurality of insertion grooves (not shown). The insertion groove is inserted into a mounting protrusion (not shown) of the rim 190 so that the tire 100 can be mounted on the rim 190 .

The body ply 140 extends along the tread portion 110 , the sidewall 120 and the bead 130 to form the skeleton of the tire 100 . The body ply 140 may have a structure in which a tire cord is included inside a certain rubber component.

Since the body ply 140 is turned up at the bead 130, an inner space partitioned by the body ply 140 may be formed, and the bead core 131 and the bead filler 132 may be formed in the inner space. ) is placed.

The body ply 140 may be formed by overlapping a plurality of cord papers made of high-strength fiber organic materials such as steel, polyester, or rayon, and then coating them with rubber and rolling them. Specifically, the body ply 140 may include at least one rubber component selected from the group consisting of synthetic rubber and natural rubber, and may include at least one third cord 141 as shown in FIG. 3 . According to one embodiment of the present invention, the third cord 141 may include a high-strength PET textile cord.

The belt part 150 can improve the durability of the tire 100 and form a skeleton. In addition, the belt part 150 plays a role of securing driving stability by maintaining a wide contact surface of the tread part 110 as well as mitigating external impact. The belt unit 150 is disposed inside the tread unit 110 and may be formed by rolling by coating the plurality of first and second cords 151a and 151b with rubber. The body ply 140 may be disposed inside the belt unit 150 .

The inner liner 170 may be disposed inside the tire 100 to prevent air leakage and maintain air pressure in the tire 100 . The inner liner 170 may be formed of a rubber layer having excellent sealing properties. For example, the inner liner 170 may be made of high-density butyl rubber or the like.

The inner liner 170 may be disposed inside the body ply 140 and extend to the bead 130 . The inner liner 170 may contact one surface of the body ply 140, and both ends may contact the bead 130.

The rim 190 may be connected to the tire 100 to support the tire 100 and form an internal space 180 between the rim 100 and the tire 100 . The inner space 180 is filled with air, and the rim 190 may include a valve (not shown) connected to the inner space 180 . In one embodiment, the rim 190 may be formed of a metal material such as aluminum or alloy.

In this way, the tire 100 and the rim 190 maintain a sealed state in a state in which high-pressure air is filled in the inner space 180 . For this reason, resonance noise may be generated inside due to rotational force while the tire 100 is in contact with the road surface.

Hereinafter, the structure of the belt unit according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4 . Details not disclosed in FIGS. 3 and 4 may refer to FIGS. 1 and 2 .

Figure 3 is a cross-sectional view showing a belt portion according to an embodiment of the present invention in part B of FIG. FIG. 4 is a top view showing a first code layer and a plurality of second code units according to an embodiment of the present invention, taken in part C of FIG. 3 .

3 and 4, inside the belt unit 150 according to an embodiment of the present invention, the first cord layer 151 and the first cord layer 151 arranged in a zigzag pattern along the longitudinal direction of the belt unit 150. It includes a plurality of second code units 152 arranged alternately with respect to the code layer 151 . In this case, the first code layer 151 may be formed by arranging a plurality of first codes 151a. According to one embodiment of the present invention, the first code 151a may include a PET Textile code.

Conventionally, a nylon cord was placed inside the cap ply part. Such a nylon cord has an excellent shrinkage rate, and can play a role of suppressing the movement of the belt part by shrinking by heat generated at a high temperature. However, in the case of nylon cord, the modulus is inferior to that of PET cord, and as movement of a plurality of belt parts disposed inside the belt part occurs, the interface between the belt layers and between the belt layers and the cap ply may be destroyed during driving of the tire. have.

Therefore, according to one embodiment of the present invention, by placing a high-strength PET Textile cord inside the belt part 150, the motion of the belt part 150 can be minimized through the excellent modulus characteristics of the PET Textile cord. have. In addition, the fixing force of the belt portion 150 may be improved by simultaneously rolling the cap ply portion and the plurality of belt layers and integrally forming the cap ply portion instead of disposing the cap ply portion outside the plurality of belt layers.

In addition, a zigzag-shaped first cord layer 151 is disposed inside the integrally formed belt part 150, and a second cord part including a steel cord around the first cord layer 151 ( 152) are staggered, it is possible to minimize the movement of the belt part 150 compared to the case where the cap ply parts are separately arranged, and the possibility of occurrence of phenomena such as interface breakage between the belt parts and between the belt part and the cap ply part can be minimized in advance. It can be prevented.

In addition, the durability of the tire can be improved by 10 to 15 percent compared to the structure in which the nylon cord is disposed inside the cap ply part.

In addition, since the second code parts 152 are alternately arranged based on the first code layer 151 , the second code parts 152 may be spaced apart from each other by the first code layer 151 . Through this, it is possible to improve the durability of the belt part 150 and the tire by preventing the second cord parts 152 from contacting each other.

The second cord portion 152 may be formed by contacting two steel cords. The steel cord may be formed by twisting a plurality of thin wires.

The first code layer 151 may have a concave portion 1151 formed between zigzag shapes. The second code part 152 may be disposed in the concave part 1151 . The first cord layer 151 is disposed to surround the second cord part 152 to fix the second cord part 152, thereby improving the durability of the belt part 150.

In the high-strength PET Textile cord according to an embodiment of the present invention, the tensile strength of the yarn may be 12 g / d or more, and the cutting strength may be 19 kgf or more. In addition, the elongation rate may have a value of at least 13% and the shrinkage rate at a maximum value of 2%. In addition, the modulus can be 40% higher than that of the existing nylon cord.

The rubber part 153 may form the belt part 150 by covering the first cord layer 151 and the second cord part 152 and rolling them. According to one embodiment of the present invention, the tensile strength of the rubber part 153 may have a value of 150 to 180 kgf/cm ² .

3, the distance W2 between the first code layer 151 and the upper surface of the belt part 150 and the distance W2 between the first code layer 151 and the lower surface of the belt part 150 , may be shorter than the distance W1 between the plurality of first codes 151a forming the first code layer 151 . That is, the first code layer 151 is disposed to be adjacent to both the upper and lower surfaces of the belt unit 150 to minimize movement of the surface of the belt unit 150 and further improve durability of the belt unit 150. can

According to this embodiment, the first code layer 151 may further include a plurality of first cords 151a and a plurality of second cords 151b intertwined in a vertical direction. Since the plurality of first cords 151a and the plurality of second cords 151b are formed to be entangled in the lattice direction, movement of the belt part 150 that may occur at various angles is minimized and at the same time, the movement of the belt part 150 Durability can be further enhanced.

Hereinafter, referring to FIG. 5, a process of rolling a belt part according to an embodiment of the present invention will be described. Details not shown in FIG. 5 may refer to FIGS. 1 to 4 .

5 is a view showing a rolling tool in which a belt part is rolled according to an embodiment of the present invention.

Referring to FIG. 5 , the belt unit 150 according to an embodiment of the present invention may be integrally formed by rolling. As shown in FIG. 5, the rolling uses a single rolling tool T, and the first cord layer 151 made of PET Textile (fabric) cord and the second cord part 152 made of steel cord are combined with the rubber part ( 153) and then rolled to form the belt part 150.

The belt part 150 formed through the above process has low deformation due to external force due to the high-strength PET Textile cord, minimizes the movement of the belt part 150 during tire driving, and can prevent contact between the second cord parts 152. have.

In particular, in the belt part 150 integrally formed through a single rolling tool, interface failure between belt layers and interface failure between the belt layer and the cap ply layer do not occur, and a plurality of cap ply layers having nylon cords disposed thereon do not occur. Compared to the structure covering the belt layer of the tire, the durability of the tire can be improved by 10 to 15 percent.

Hereinafter, a belt unit according to another embodiment of the present invention will be described with reference to FIG. 6 .

6 is a cross-sectional view of a belt part according to another embodiment of the present invention, taken in part B of FIG. 2 .

Referring to FIG. 6 , the first cord layer 151' of the belt part according to another embodiment of the present invention may be formed in a concavo-convex shape. That is, the corresponding area of the first code layer 151' disposed adjacent to the upper and lower surfaces of the belt unit 150' is increased so as to correspond to the upper and lower surfaces of the belt unit 150', so that the surface portion of the belt unit 150' movement can be minimized. In addition, since the concavo-convex connection portion of the first cord layer 151' passes through the central portion of the belt unit 150', movement within the belt unit 150' can also be minimized. Through this, durability of the belt part 150 and the tire including the belt part 150 can be further improved.

As such, the present invention has been described with reference to the embodiments shown in the drawings, but this is only an example. Those skilled in the art can fully understand that various modifications and equivalent other embodiments are possible from the embodiments. Therefore, the true technical protection scope of the present invention should be determined based on the appended claims.

Specific technical details described in the embodiments are examples, and do not limit the technical scope of the embodiments. In order to briefly and clearly describe the description of the invention, descriptions of conventional general techniques and configurations may be omitted.

In addition, the connection of lines or connection members between the components shown in the drawing is an example of functional connection and / or physical or circuit connection, which can be replaced in an actual device or additional various functional connections, physical connections, or circuit connections. In addition, if there is no specific reference such as "essential" or "important", it may not necessarily be a component necessary for the application of the present invention.

“Above” or similar designations described in the description and claims of the invention may refer to both singular and plural, unless otherwise specifically limited. In addition, when a range is described in an embodiment, it includes an invention in which individual values belonging to the range are applied (unless there is no description to the contrary), and each individual value constituting the range is described in the description of the invention. same. In addition, if there is no clear description or description of the order of steps constituting the method according to the embodiment, the steps may be performed in an appropriate order. Embodiments are not necessarily limited according to the order of description of the steps.

The use of all examples or exemplary terms (eg, etc.) in the embodiments is simply to describe the embodiments in detail, and unless limited by the claims, the examples or exemplary terms limit the scope of the embodiments. It is not. In addition, those skilled in the art will appreciate that various modifications, combinations and changes may be made according to design conditions and factors within the scope of the appended claims or equivalents thereof.

100: tire
110: tread part
140: body fly
141 third code
150: belt part
151: first code layer
151a first code
151b: second code
1511: recess
152: second code part
152a, 152b: steel code
153: rubber part

Claims (9)

tread part; and
Including a belt portion disposed inside the tread portion,
Inside the belt part,
a first cord layer arranged in a zigzag pattern along the longitudinal direction of the belt part; and
A plurality of second code units arranged alternately with respect to the first code layer;
The first code layer is formed by arranging a plurality of first cords,
The first cord layer further comprises a plurality of second cords intertwined with the plurality of first cords in a vertical direction. delete According to claim 1,
A distance between the first cord layer and an upper surface of the belt part and a distance between the first cord layer and a lower surface of the belt part are shorter than a distance between a plurality of first cords forming the first cord layer. delete According to claim 1,
A tire in which a body ply part is disposed inside the belt part. According to claim 1,
The second cord portion is disposed to be spaced apart from each other based on the first cord layer. delete According to claim 1,
A tire formed by integrally rolling the belt portion. According to claim 1,
The first cord layer is formed in a concave-convex shape.

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