KR20220157057A - Tire curing bladder, tire and manufacturing method - Google Patents

Abstract

An extrusion preformer according to an embodiment of the present invention comprises: a body part; a discharge part formed in the body part and discharging tread cushion rubber; and a discharge width control part arranged below the discharge part and adjusting a width of the tread cushion rubber discharged. The present invention is to provide bladder for tire curing that can reduce noise generated during a curing process by using the bladder, a tire bladder and a method for manufacturing the same.

Description

Bladder for tire curing, tire and its manufacturing method {TIRE CURING BLADDER, TIRE AND MANUFACTURING METHOD}

The present invention relates to a bra for curing tires, a tire, and a method for manufacturing the same, and more particularly, a bra for curing tires for reducing abnormal noise of a pneumatic tire by applying a sound-absorbing pattern on the outer surface of the bra, a bra for curing tires, and It's about how to make it.

Radial tires, which are mainly used for passenger cars, are assembled with an inner liner, carcass cord, and side wall, and a belt and cap fly , the tread is attached to become a semi-finished product. Then, a bladder for curing the tire is brought into close contact with the inner liner of the semi-finished product, and then inflated to form a green case. Thereafter, the green case is inserted into a tire mold having a predetermined size and shape, and a curing process is performed by applying heat and pressure to finally complete a radial tire.

At this time, when the semi-finished tire is put into the mold and the curing process is performed, the brada for tire curing compresses the semi-finished tire so that the outer surface of the semi-finished tire is in close contact with the inner surface of the mold, and at the same time, heat and pressure are applied to the semi-finished tire so that the tire curing process can be performed. will be conveyed

However, there is a problem in that a large amount of noise is generated from the semi-finished tire in the process of compressing the tire through the bra for curing the tire. In addition, a structure may be required to easily discharge air generated in the process of performing the curing process through the brada to the outside.

An object to be solved by the present invention is to provide a bra for tire curing, a tire, and a method for manufacturing the same, which can reduce noise generated during the curing process using the bra.

In addition, the problem to be solved by the present invention is to provide a bra for tire curing, a tire, and a method for manufacturing the same, including a structure for easily discharging air generated during the curing process using the bra.

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

A bra for curing a tire according to an embodiment of the present invention includes a bra for curing a tire that penetrates vertically, the surface of the bra includes an embossed portion formed in an embossed shape, and the embossed portion is It includes a ridge formed convexly outwardly and a valley formed concavely, and a venting part is formed in the trough.

In the bra for curing tires according to an embodiment of the present invention, the venting part may be disposed at an end of the trough part.

In the bra for tire curing according to an embodiment of the present invention, the venting part may include a first venting part disposed at an end of the trough part and a plurality of second venting parts disposed along the circumference of the trough part.

In the bra for vulcanizing tires according to an embodiment of the present invention, the size of the second venting part may be smaller than the size of the first venting part.

In the bra for curing tires according to an embodiment of the present invention, the floor portion may be in close contact with the inner liner of the tire.

In the brada for curing tires according to an embodiment of the present invention, the side cross-section of the embossing portion may be formed in a sine wave shape.

In the bra for vulcanizing tires according to an embodiment of the present invention, the trough and crest of the embossing portion may be alternately arranged.

A tire according to an embodiment of the present invention includes a tread extending in a circumferential direction of the tire and having a groove; and an inner liner disposed on an inner surface of the tread, wherein the inner surface of the inner liner is formed as an embossed portion.

In the tire according to one embodiment of the present invention, the embossing portion includes a ridge portion and a trough portion, and the ridge portion and the trough portion may be disposed alternately.

In the tire according to one embodiment of the present invention, the side cross-section of the embossing portion may be formed in a sine wave shape.

A method of manufacturing a tire according to an embodiment of the present invention includes the steps of attaching a brada having an embossed surface to an inner liner disposed on an inner surface of a tire; and forming an embossed shape on an inner surface of the inner liner through the bra.

In the tire manufacturing method according to an embodiment of the present invention, before the step of attaching the bra to the inner liner disposed on the inner surface of the tire, manufacturing a bra that has a surface portion formed as an embossed portion; and forming a venting part at the valley of the embossing part of the brada.

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.

A bra for tire curing according to an embodiment of the present invention, a tire and a method for manufacturing the same, the surface of the bra is formed in an embossed structure formed in a sine wave shape, and the noise generated from the semi-finished tire in close contact with the bra during the curing process can be drastically reduced.

In addition, a bra for tire curing according to an embodiment of the present invention, a tire, and a method for manufacturing the same can easily discharge air generated during the curing process to the outside of the bra through a venting part formed in the valley of the embossing part.

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 view showing the appearance of a bra for curing tires according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an embossed portion of a bra for curing a tire according to an embodiment of the present invention, taken along line AA′ of FIG. 1 .
FIG. 3 is part B of FIG. 1 and is a view showing a surface portion of a bra for curing a tire according to an embodiment of the present invention.
4 is a view showing a venting portion of a bra for curing a tire according to another embodiment of the present invention.
5 is a view showing a state in which a bra for curing a tire according to an embodiment of the present invention is in close contact with the inner surface of a tire.
6 is a view showing a state in which an embossed portion is formed on the inner liner of the tire by adhering the inner surface of the tire to the bra for curing the tire according to an embodiment of the present invention.
7 is a front view schematically showing a tire according to an embodiment of the present invention.
FIG. 8 is a cross-sectional view taken along line III-III of FIG. 7, showing an embossed portion of an inner surface of an inner liner according to an embodiment of the present invention.

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 explanation. 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 implementable, 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 be performed 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.

Hereinafter, the structure of a bra for curing a tire according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

1 is a view showing the appearance of a bra for curing tires according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an embossed portion of a bra for curing a tire according to an embodiment of the present invention, taken along line AA′ of FIG. 1 . FIG. 3 is part B of FIG. 1 and is a view showing a surface portion of a bra for curing a tire according to an embodiment of the present invention.

1 to 3, the brada 100 for tire curing according to an embodiment of the present invention includes an embossed portion 110 formed in an embossed shape on the surface of the brada, and the embossed portion 110 includes a crest 111 convexly formed in the direction in which the tire is located and a valley 112 formed concavely, and the venting part 200 is formed in the valley 112.

Brada 100 for tire curing compresses the tire from the inside of the tire in the direction of the mold so that the outer surface of the tire can be in close contact with the inner surface of the mold in the curing process of putting the tire in the mold and curing, and at the same time the tire curing process proceeds heat and pressure can be transferred to the semi-finished tire to

Patterns may be formed on the brada surface. At this time, a pattern may be formed on the inner liner 350 of the tire to correspond to the pattern formed on the surface of the brada. Depending on the pattern formed on the inner liner of the tire, the level of noise generated from the tire during driving of the finished tire may vary. If the pattern formed on the inner liner 350 of the tire is formed in a shape that amplifies the noise generated inside the tire, the noise generated inside the tire is amplified during driving and the noise generated from the tire becomes larger. can Conversely, when the pattern formed on the inner liner 350 of the tire is formed in a shape that offsets the noise generated inside the tire, the noise generated inside the tire is reduced while the tire is running, thereby reducing the noise generated from the tire. can be reduced

The surface of the brace for tire curing according to an embodiment of the present invention includes an embossing portion formed in an embossed shape, the embossing portion is formed of a peak portion and a valley portion, and the peak portion is in close contact with the inner liner 350 of the tire The inner liner 350 of the tire may be formed into an embossed shape by compressing the inner liner 350 . Through this, when noise is generated from the tire during driving of the finished tire, the noise of the tire is reduced due to the inner liner structure of the inner surface of the tire formed in an embossed shape, so that driving convenience of the tire can be improved.

In the case of such an embossed structure, compared to a flat structure, a sound receiving area may be widened, and sound absorption may increase.

According to one embodiment of the present invention, the venting portion 200 may be formed in the valley portion 112 of the brada 100. The venting unit 200 can discharge air, which is cured from the semi-finished tire during the curing process, to the outside. At this time, the venting part 200 may be formed in the valley part 112 . During the vulcanization process, since the crest 111 of the brada 100 is in close contact with the tire inner liner 350 first, the surface of the inner liner 350 of the tire and the venting portion 112 in close contact relatively later By forming the 200, air generated from the semi-finished tire can be more easily discharged to the outside.

Because the embossing portion 350 is formed on the inner liner 350 through the embossing portion 110, the space between the valley portion 112 of the brada 100 and the inner liner 350 gradually decreases, so that This is because the air pushed into the space occupies the inner space of the valley 112 and can be easily discharged to the outside through the venting part 200 disposed in the valley 112 under pressure by the incoming inner liner 350 . For the above-described air discharge, additional reference may be made to FIGS. 5 and 6 .

Referring to FIG. 3 , the venting part 200 may be disposed at an end of the valley part 112 . Through this, the air pushed into the valley 112 during the curing process occupies the inner space of the valley 112 and the inner liner 350 enters the venting unit 200 disposed at the end of the valley 112 can come out naturally.

The side cross-section of the embossing portion 110 according to an embodiment of the present invention may be formed in a sine wave shape.

When tire noise is generated, the flow of sound moves in the rotational direction of the tire, and the flow of sound may occur according to the movement of the vehicle. Sound is amplified or canceled when sound waves overlap, and overlap may occur due to minute speed changes or changes in moving direction. The three-dimensional pattern can create more sound cancellation compared to the current pattern.

As in one embodiment of the present invention, the surface of the inner liner 350 of the tire is manufactured in a sine wave type embossing structure by forming the side section of the embossing part 110 of Brada in a sine wave type. By doing so, it is possible to increase the surface area of the inner liner 350 to increase sound absorption and at the same time reduce noise generated from the tire by canceling sound waves through a sinusoidal shape. As shown in FIGS. 1 to 3 , it is possible to further reduce tire noise during driving by arranging the troughs and crests of the embossed portion to be crossed with each other.

4 is a view showing a venting portion of a bra for curing a tire according to another embodiment of the present invention.

Referring to FIG. 4, the venting parts 200' and 210' according to another embodiment of the present invention are the first venting part 200' disposed at the end of the valley part 112 and the valley part 112. A plurality of second venting parts 210' disposed along the circumference may be included.

Air that could not escape through the first venting part 200' disposed at the end of the valley part 112 is disposed along the circumference of the valley part 112 and the first venting part 200'. It can be discharged to the outside through the second venting part 210'. Through this, the curing process can be performed smoothly, and air can be discharged more effectively. According to this embodiment, the size of the venting hole of the second venting part 210' may be smaller than that of the first venting part 200'.

Hereinafter, a method for manufacturing a tire according to an embodiment of the present invention will be described with reference to FIGS. 5 and 6 . Details not shown in FIGS. 5 and 6 may refer to FIGS. 1 to 3 .

5 is a view showing a state in which a bra for curing a tire according to an embodiment of the present invention adheres to the inner surface of a tire. 6 is a view showing a state in which an embossed portion is formed on the inner liner of the tire by adhering the inner surface of the tire to the bra for curing the tire according to an embodiment of the present invention.

5 and 6, in the tire manufacturing method according to an embodiment of the present invention, the brada 100 having an embossed surface is brought into close contact with the inner liner 350 disposed on the inner surface of the tire. and forming an embossed shape on the inner surface of the inner liner 350 through the bra 100.

As shown in FIG. 5 , the floor portion 111 of the brada 100 may adhere to the inner liner 350 of the tire. The floor portion 111 may expand while being in close contact with the inner liner 350 of the tire to create an embossed shape on the surface of the inner liner 350 . 6 discloses that the inner surface of the inner liner 350 is formed in an embossed shape by expanding the bra 100 . The structure of a tire in which the inner surface of the inner liner 350 is formed in an embossed shape will be described later.

According to the present embodiment, before the step of attaching the bra 100 to the inner liner 350 disposed on the inner surface of the tire, manufacturing a bra formed of an embossed portion 110 having an embossed surface portion and a bra A step of forming the venting portion 200 in the valley portion 112 of the embossing portion 110 of the multi (100) may be further included.

Hereinafter, a tire including an embossed inner liner according to an embodiment of the present invention will be described with reference to FIGS. 7 and 8 . Details not shown in FIGS. 7 and 8 may refer to FIGS. 1 to 3 , 5 and 6 .

7 is a front view schematically showing a tire according to an embodiment of the present invention. FIG. 8 is a cross-sectional view taken along line III-III of FIG. 7, showing the embossed portion of the inner surface of the inner liner according to an embodiment of the present invention.

The in direction shown in FIG. 7 means the inner surface direction of the tire 300, and the out direction means the outer surface direction of the tire 300.

7 and 8, the tire 300 is a pneumatic tire, and is disposed on a tread 310, sidewalls 320 extending from both sides of the tread 310, and ends of the sidewalls 320. It may include a bead 330 to be.

In addition, the tire 300 may include a body ply 340 and a belt layer 370 located below the tread 310, and a cap ply 360 may be further included on the upper portion of the belt layer 370. have. In addition, the tire 300 may include an inner liner 350 positioned inside the tread 310 and the pair of sidewalls 320 to maintain the internal air pressure of the tire 300 .

Referring to FIG. 7 , the tire 300 may have a shape extending in the circumferential direction RT around the central axis AX. In addition, a wheel (not shown) may be coupled to the inner side of the tire 300 based on the radial direction r from the central axis AX.

The tread 310 may include a region facing the road surface during driving after the tire 300 is mounted on the vehicle. For example, the tread 310 may include a region in contact with the road surface during driving of the vehicle. The tread 310 is made of a thick rubber layer and transmits driving lock and braking force of the vehicle to the ground.

The tread 310 may have one or more patterns, and a plurality of grooves 315 may be formed adjacent to these patterns. The groove 315 may have a shape extending in at least the first direction. In addition, the groove 315 may also include a region having a shape elongated in a direction crossing the first direction.

The number and shape of the grooves 315 may be variously determined according to driving characteristics and uses of the tire 300 .

Groove 315 may be formed adjacent to the pattern of tread 310 . For example, the groove 315 may form a boundary of one area of the tread 310 as a form in which one area of the tread 310 is removed.

The number and shape of the grooves 315 may be variously determined according to driving characteristics and uses of the tire 300 . The groove 315 may include a plurality of grooves.

The tread 310 may have a tread block partitioned by a plurality of grooves 315 . The tread block is a part that comes into contact with the road surface during driving of the vehicle, and may be partitioned by a first groove that runs around the tire 300 in the radial direction and a second groove formed in the transverse direction of the tire 300 .

Tread patterns for steering stability, traction, and braking properties and blocks partitioned by the tread patterns may be positioned on the surface of the tread block. The tread patterns may include a plurality of grooves for backbone and sipes for improving traction and braking power when driving on a road surface. 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 300 by absorbing moisture and breaking the water film when driving on a wet road.

Sidewalls 320 extend from both sides of the tread 310 to form the sidewalls of the tire 300 . The sidewall 320 is made of the same or different material as the tread 310 and protects the bead 330 and the body ply 340, which will be described later. In one embodiment, one end of the sidewall 320 may extend from one side of the tread 310 and the other end may contact the tire rim.

The bead 330 is disposed at the lower end of the sidewall 320 and is formed in the form of a square or hexagonal wire bundle in which rubber is coated on a steel wire, so that the tire 300 and the tire rim can help combine In one embodiment, the bead 330 is arranged to be wrapped by the body ply 340, so that the tire 300 can be seated and fixed to the tire rim.

The bead 330 may include a bead core and a bead filler. The bead core is disposed below the bead filler and may be formed by twisting a plurality of rubber-coated steel bead cords (wires). The bead filler may be disposed extending from the bead core in the sidewall direction. The bead filler is a rubber filler attached to one side of the bead core and serves to reinforce the bead core. In another embodiment, a plurality of bead fillers may have different physical properties. Bead 330 may have a plurality of insertion grooves (not shown). The insertion groove is inserted into the mounting protrusion of the rim, so that the tire can be mounted on the rim.

The body ply 340 forms the skeleton of the tire 300 and is a component for increasing durability of the tire 300, and may be formed by topping a rubber material on a fiber cord. The body ply 340 can absorb loads and shocks received by the tire 300 and maintain the air pressure of the tire 300 at a certain level. In one embodiment, the body ply 340 may be turned up from the inner surface of the tire 300 toward the outer surface to cover at least a portion of the bead 330 .

The body ply 340 may be formed by overlapping a plurality of cord papers made of high-strength fibrous organic materials such as steel, polyester, or rayon, and then coating them with rubber and rolling them. Specifically, the body ply 340 may include at least one rubber component selected from the group consisting of synthetic rubber and natural rubber, and may include at least one tire cord. Various natural fibers or rayon, nylon, polyester, and Kevlar may be used as the tire cord, and a steel cord formed by twisting a plurality of thin wires may also be used.

The inner liner 350 may be disposed on an inner surface (in direction) of the body ply 340 . The inner liner 350 may prevent leakage of air from the tire 300 and maintain air pressure in the tire 300 . The inner liner 350 may be formed of a rubber layer having excellent sealing properties. For example, the inner liner 350 may be made of high-density butyl rubber or the like.

The inner liner 350 may be disposed inside the body ply 340 and extend to the bead 330 . The inner liner 350 may contact one surface of the body ply 340, and both ends may contact the bead 330.

Belt layer 370 may be disposed between tread 310 and body ply 340 . The belt layer 370 can improve grounding characteristics and driving stability by mitigating shocks received by the tire 300 from the road surface while driving a vehicle equipped with the tire 300 and expanding the grounding surface of the tread 310 . The belt layer 370 may be formed by rolling by coating a plurality of belt cords made of steel or organic fibers with rubber. The belt layer 370 may be provided with a plurality of layers. For example, a plurality of belt layers may be disposed on the upper surface of the inner liner 350 .

A cap ply 360 may be disposed between the belt layer 370 and the tread 310 . The cap ply 360 is formed of special cord paper to minimize the movement of the belt layer 370 during vehicle driving and to prevent separation of the belt layer 370 during high-speed driving. The cap ply 360 may include a polyester synthetic fiber. The cap ply 360 is supported by the belt layer 370 and the body ply 340, thereby minimizing movement of the belt layer 370 during driving.

The tire 300 according to the present embodiment includes a tread 310 extending along the circumference of the tire and having a groove, and an inner liner 350 disposed on an inner surface of the tread 310, and the inner liner ( 350) is formed with an embossed portion (350).

At this time, the embossing portion 350 includes a peak portion 351 and a valley portion 352, and the peak portion 351 and the valley portion 352 may be disposed alternately. In addition, the side cross-section of the embossing portion 350 may be formed in a sine wave shape to correspond to the side cross-section of the brada 100.

In this way, the embossed portion 350 having an embossed shape is formed on the surface of the inner liner 350 by the expansion of the bra 100, so that the noise generated inside the tire tries to pass through the inner liner 350. In this case, the noise is offset by the embossed inner liner 350, so that noise generated from the tire during driving can be reduced.

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: Brada
110: embossing unit
111: floor
112: bones
200: venting part
200 ': first venting part
210 ': second venting part
300: tire
350: inner liner (inner liner embossing part)
351: inner liner floor
352: inner liner bone

Claims (12)

Including a bra for curing tires formed through the top and bottom,
The surface of the brada includes an embossed portion formed in an embossed shape,
The embossing part,
Including a ridge formed convexly and a valley formed concavely in the outer direction of the brada,
A bra for vulcanizing a tire in which a venting portion is formed in the valley portion. According to claim 1,
The venting portion is a bra for vulcanizing a tire disposed at an end portion of the trough portion. According to claim 1,
The venting unit is a tire curing bra including a first venting unit disposed at an end of the trough and a plurality of second venting units disposed along a circumference of the trough. According to claim 3,
The size of the second venting part is smaller than the size of the first venting part. According to claim 1,
The floor portion is a bra for curing a tire that is in close contact with the inner liner of the tire. According to claim 1,
The side end surface of the embossing portion is a tire curing bra formed in a sine wave shape. According to claim 1,
Bras for vulcanizing tires in which the valleys and crests of the embossing part are alternately disposed. a tread extending along the circumferential direction of the tire and having a groove; and
Including an inner liner disposed on the inner surface of the tread,
An inner surface of the inner liner is formed as an embossed portion. According to claim 8,
The embossing portion includes a peak portion and a valley portion,
A tire in which the peaks and troughs are arranged alternately with each other. According to claim 8,
The side cross-section of the embossing portion is formed in a sine wave shape. Adhering the brada, the surface of which is formed in an embossed shape, to the inner liner disposed on the inner surface of the tire; and
and forming an embossed shape on an inner surface of the inner liner through the brada. According to claim 11,
Before the step of attaching the bra to the inner liner disposed on the inner surface of the tire,
Manufacturing a brada in which the surface portion is formed as an embossed portion; and
The method of manufacturing a tire further comprising the step of forming a venting part at the valley of the embossing part of the brada.

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