KR102008899B1 - Pneumatic tire - Google Patents

Abstract

According to the present invention, a tread portion carcass cord is provided on a tread portion carcass disposed on a tread portion, and a bead portion carcass cord is provided on a bead portion carcass disposed on the bead portion, and between a lower end of the tread portion and an upper end of the bead portion. The pneumatic tire is provided with the side carcass code before the turn-up, and the side carcass code before the turn-up is provided in the side part flexion area of the side part. A carcass cord having a greater strength than the carcass cord and the bead portion carcass cord is included.

Description

Pneumatic Tires {PNEUMATIC TIRE}

The present invention relates to a pneumatic tire which minimizes the weight increase of the pneumatic tire and improves the steering stability. More particularly, the present invention relates to strength of the pneumatic tire having at least one or more carcasses in the side flexion region of the pneumatic tire. The present invention relates to a pneumatic tire having a large carcass cord and having reinforced side portion rigidity.

In general, the tire supports the entire weight of the vehicle by the air filled inside, the internal air pressure buffers to absorb the shock applied to the vehicle from the road surface, the basic driving of the vehicle by the friction between the road surface and the tire, Stop, change direction is possible.

This action is caused by the friction between the elastomer compound of the tire and the rough surface of the roadway. Tires must be designed for a variety of road conditions to provide good driving characteristics and to provide a comfortable, smooth ride and long driving life. Moreover, the tires must be maintained in abnormal driving conditions, i.e. when the tires are driven at excessive speeds below the optimum road surface, or when the ambient temperature reaches extreme or severe temperatures. The performance of a tire depends on several features of the tire structure. One of the mechanical features of the tire is Carcass provided on the tire side portion. Carcass is arranged in both the circumferential direction and the transverse direction of the tire to serve as the overall frame, and consists of a series of structures surrounding the bead wire.

In addition, the carcass serves as a skeleton to maintain the rigidity of the green case formed by fabricating a fabric cord having good elongation and topping with a rubber having excellent adhesion. In addition, the torsional force of the wheel and the bead of the vehicle according to steering of the vehicle (Torsional Force) serves to improve the cornering and steering stability of the tire. In order to improve the steering stability, the amount of semi-finished products to increase the amount of rubber affecting the stiffness of the side portion, additional reinforcement should be provided, but the tire weight or manufacturing cost may be increased.

Accordingly, there is a demand for a technology capable of minimizing weight increase of tires and improving steering stability.

Patent Document: Domestic Publication No. 10-2005-0047407 (published May 20, 2005)

An object of the present invention is to provide a pneumatic tire having improved side rigidity by having a carcass cord having a greater strength than a non-digging region (tread portion and bead portion) in a side portion extending region of a pneumatic tire.

According to the present invention for achieving the above object, the tread portion carcass cord is provided on the tread portion carcass disposed on the tread portion, the bead portion carcass cord is provided on the bead portion carcass disposed on the bead portion, A pneumatic tire having a side portion carcass before turn-up disposed at a side flexion region between a lower end of a tread portion and an upper portion of the bead portion, wherein the side portion carcass cord is provided on the side portion carcass before turn-up, and the turn-up tire is provided. The front side carcass cord may include a tread carcass cord and a carcass cord having a greater strength than the bead part carcass cord.

At this time, the side portion carcass is disposed after the turn-up for additional rigidity reinforcement in the side portion flexion area, the side portion carcass cord is provided after the turn-up and the side portion carcass cord is turned up after the turn-up, The tread part carcass cord and the bead part carcass cord may have a greater strength than the carcass cord.

The strength of the side part carcass cord before the turn-up, the side part carcass cord after the turn-up, the tread part carcass cord and the bead part carcass cord are

Derived through Equation 1 below,

<Equation 1>

Carcass code strength = Breaking force per 1 carcass cord x number of carcass cord strands per 1 inch (EPI: End Per Inch)

Further, the strength of the side portion carcass cord after the turn-up is greater than (≥≥) the strength of the side portion carcass cord before the turn-up, or the strength of the side portion carcass cord before the turn-up is the side portion carcass code after the turn-up. May be greater than (≥).

In addition, the carcass cord diameter of each part may satisfy the diameter range of greater than 0.6mm and less than 1.0mm.

Embodiments of the present invention can improve the steering stability by reinforcing the side stiffness by designing the strength of the side carcass code before and after the turn-up disposed in the side flexion area than the tread portion or bead carcass code strength. There is an advantage.

In addition, embodiments of the present invention has the advantage that it is possible to minimize the weight increase of the tire, compared to the prior art that adds the fabric reinforcement to the carcass longevity for side structure reinforcement.

1 is a longitudinal sectional view showing a pneumatic tire according to an embodiment of the present invention.
2 is an exploded view showing carcass angles in a structure in which a carcass cord angle of a pneumatic tire according to an embodiment of the present invention is provided in the upper right direction of the drawing and the side portion carcass is present after turn-up.
3 is an exploded view showing carcass angles in a structure in which a carcass cord angle of a pneumatic tire according to an embodiment of the present invention is provided in a lower right direction of the drawing and a side portion carcass is present after turn-up.
4 is an exploded view showing carcass corners in a structure in which a carcass cord angle of a pneumatic tire according to an embodiment of the present invention is provided in the upper right direction of the drawing and there is no side carcass after turn-up.
FIG. 5 is an exploded view illustrating a carcass leg in a structure in which a carcass cord angle of a pneumatic tire according to an embodiment of the present invention is provided in a lower right direction of the drawing and there is no side carcass after turning up.
Figure 6 is a side cross-sectional view showing the tread portion carcass of the pneumatic tire according to an embodiment of the present invention.
7 is a side cross-sectional view showing the carcass of the side portion before the turn-up of the pneumatic tire according to an embodiment of the present invention.
8 is a side cross-sectional view showing the carcass of the bead portion of a pneumatic tire according to an embodiment of the present invention.
9 is a side cross-sectional view showing the carcass of the side portion after the turn-up of the pneumatic tire according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the embodiment of the present invention. The following description is one of several aspects of the invention that can be claimed, and the following description may form part of the detailed description of the invention. However, in describing the present invention, a detailed description of known configurations or functions may be omitted to clarify the present invention.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. These terms are only used to distinguish one component from another. When a component is said to be 'connected' or 'connected' to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between Should be. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

1 is a longitudinal cross-sectional view showing a pneumatic tire according to an embodiment of the present invention, Figures 2 to 3 is a carcass code angle of the pneumatic tire according to an embodiment of the present invention respectively on the right / 4 is a development view showing carcass angles in a structure having a side portion carcass after turning up, and FIGS. 4 to 5 are views showing carcass cord angles of pneumatic tires according to an embodiment of the present invention, respectively. Is an exploded view showing the carcass parts in a structure provided in the upper and lower right of the side and there is no side carcass after turning up, and FIGS. 6 to 9 are tread portions of pneumatic tires according to one embodiment of the present invention, respectively. Side section showing the carcass code of the side part before the turn-up, the bead part, and the side part after the turn-up.

As shown in FIGS. 1 to 9, the pneumatic tire 10 includes a tread portion carcass 110 and a tread portion carcass cord 111 and is grounded on a road surface, and a bead portion car A bead part 300 including a casing 310 and a bead part carcass cord 311 is mounted on a tire rim to support a load of the vehicle and transmits steering force, and a side part carcass 210 before turn up and a turn up part. Side part carcass cord 211 to the turn-up side carcass 220 and after the turn-up side carcass cord 221 and transmits the steering force between the tread portion 100 and the bead portion 300 flexing It is composed of a side portion 200 to exercise.

Meanwhile, the tread part 100 may include a tread part carcass topping rubber 112 having excellent adhesiveness to topping the tread part carcass cord 111, and the bead part 300 may be The bead portion carcass cord 311 may include a bead portion carcass topping rubber 312. In addition, the side part 200 may include the side part before the turn-up, the side part carcass topping rubber 212 topping the side carcass cord 211, and the side part after the turn-up topping the side part carcass cord 221 after the turn-up. Carcass topping rubber 222.

Here, the flexion region H2 may be understood as a range between the lower end of the tread part 100 and the upper end of the bead part 300 within the cross-sectional height H1, and the tread part 100 and the bead part ( Since the configuration of 300 corresponds to the configuration of the tread portion and the bead portion that is applied to a conventional pneumatic tire, a detailed description thereof will be omitted.

In the pneumatic tire according to an embodiment of the present invention, the side part 200 includes only the side part carcass 210 before the turn-up, or the side part carcass 210 before the turn-up and the side part carcass 220 after the turn-up. It may include a structure provided at the same time.

In addition, the strength of the side part carcass cord 211 before turn-up and the side part carcass cord 221 after turn-up is used to increase the rigidity of the side part 200 to improve steering stability. 111 and greater than the strength of the bead carcass cord 311 is preferably designed.

In this case, the strength of the carcass code may be derived through Equation 1 below.

<Equation 1>

Carcass cord strength = Breaking Force per strand of carcass cord x Number of strands of carcass cord per 1 inch (EPI: End Per Inch)

Hereinafter, according to an embodiment of the present invention, the relationship between the change in the strength of the carcass cord of each part and the steering stability according to the presence or absence of the side carcass 220 after turn-up will be described with reference to Table 1.

Table 1 shows the changes in the strength of the side part carcass code 211 before and after the turn-up of the side part 200 and the side part carcass code 221 after the turn-up, and the tire performance prediction according to the presence or absence of the side part carcass 220 after the turn-up. Table showing the results of the analysis. Cornering Coefficient is a change of Lateral Force with respect to the Slip Angle change, and the larger the value, the steering stability is improved, and Aligning Torque Coefficient is a change amount of Aligning Moment with a Slip Angle change, and the smaller the value, the adjustment stability is improved.

According to the analysis results of the comparative examples and Examples 1 to 2 of the present invention, when the side portion carcass 220 is not provided after the turn-up, the cornering coefficient becomes smaller and the alignment torque coefficient becomes larger, and the side portion car before the turn-up In the case where only the casing 210 is provided, when the side portion carcass strength is increased before turning up, the cornering coefficient is increased and the alignment torque coefficient is decreased.

In addition, through the analysis results of Examples 3 to 5 compared to Comparative Example, Example 1, and Example 2, the side part carcass code 220 and the turn-up part before turn-up are provided When the strength of the side portion carcass code 221 is reinforced by 6%, it can be seen that the steering stability can be improved to a level of 3.7% to 8.1%.

In addition, through the analysis results of Example 5 and Example 6, when the strength of the tread portion carcass cord 111 and the bead portion carcass cord 311 is reinforced by 6%, the increase in the steering stability is 0.3% before turn-up After the side part carcass cord 211 is turned up, the performance improvement effect of the side part carcass cord 221 may be insignificant.

In addition, through the analysis results of Examples 7 to 10, when the strength of the side portion carcass cord 211 before turn-up and the side portion carcass cord 221 after turn-up is reinforced by 14% to 207%, 11.7% It can be seen that the steering stability can be improved to ~ 24.6%.

Here, when reinforcing the carcass cord strength, if the carcass cord diameter is smaller than 0.6mm as shown in Table 2 below, the finished product weight can be reduced, but the minimum rigidity according to the load index of the pneumatic tire This cannot be ensured and the durability of the finished product may be reduced. In addition, as shown in Table 3 below, when the diameter of the carcass cord is larger than 1.0mm, the steering stability is improved, but the weight increase and the durability of the finished product may be degraded.

Division (diameter) 0.4 0.45 0.5 0.55 0.6 0.65 0.7 Carcass cord strength 86% 90% 95% 98% 100% 102% 105% Finished product durability 70% 73% 85% 94% 100% 106% 115% Finished product weight 88% 91% 94% 97% 100% 103% 106%

Division (diameter) 1.0 1.05 1.1 1.15 1.2 Carcass cord strength 100% 102% 105% 108% 110% Finished product durability 100% 99% 98% 97% 98% Finished product weight 100% 103% 106% 109% 112%

As described above, in order to reinforce the rigidity of the side part 200 to improve steering stability, the side part carcass cord 211 before turn-up and the side part carcass cord 221 after turn-up in the flexion region H2. The strength of is preferably designed to be larger than the strength of the tread portion carcass code 111 and the bead portion carcass code 311, each carcass code strength is designed to satisfy the following equation 2, It is desirable to.

<Formula 2> In the case of the structure having only the side portion carcass 211 before turn-up,

Tread part / bead part Carcass cord (111, 311) Strength <Side part carcass cord (211) strength before turn-up

<Formula 3> In the case of the structure having the side portion carcass 211 before turn-up and the side portion carcass 221 after turn-up,

Tread part / bead part carcass cords 111, 311 Strength <side part carcass cord 211 before turn-up ≤ ≤ side part carcass cord 221 after turn-up, or

Tread part / bead part Carcass code (111, 311) Strength <strength side part carcass cord 221 after turn-up ≤ ≤ side part carcass cord 211 strength before turn-up

In addition, depending on the steering stability target of pneumatic tires, the carcass cord diameter is larger than 0.6 mm and smaller than 1.0 mm, and the carcass cord EPI (End Per Inch) and the carcass cord are composed of various breaking force. Compared with the prior art of adding reinforcement to carcass longevity, the weight increase of the tire can be minimized.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. For example, those skilled in the art can change the material, size, etc. of each component according to the application field, or combine or substitute the embodiments in a form that is not clearly disclosed in the embodiments of the present invention, this is also the present invention It will not go beyond the scope of the. Therefore, the embodiments described above are intended to be illustrative in all respects and should not be understood as being limited, and such modified embodiments should be included in the technical spirit described in the claims of the present invention.

10: Air tire 100: Tread part
110: Tread part carcass 111: Tread part carcass cord
112: tread part carcass topping rubber 200: side part
210: Side part carcass before turn up 211: Side part carcass code before turn up
212: Side part carcass topping rubber before turnup 220: Side part carcass after turn up
221: Side part carcass code after turn up 222: Side part carcass topping rubber after turn up
300: bead part 310: bead part carcass
311: Bead part carcass code 312: Bead part carcass topping rubber
H₁: Section height H₂: Side flexion area
CA: carcass cord angle

Claims (5)

The tread part carcass cord 111 is provided in the tread part carcass 110 arranged in the tread part 100, and the bead part carcass cord is provided in the bead part carcass 310 arranged in the bead part 300. 311 is provided, the side portion carcass 210 before turn-up is disposed in the side portion flexion region H2 between the lower end of the tread portion 100 and the upper end of the bead portion 300, and the side before the turn-up side. As the pneumatic tire that the side carcass code 211 is provided in the side carcass 210 before the turn-up,
The side portion carcass code 211 before the turn-up,
A carcass cord having a greater strength than the tread part carcass cord 111 and the bead part carcass cord 311,
The side part carcass 220 is disposed after the turn-up for additional rigidity reinforcement in the side part flexion region H2, and the side part carcass cord 221 is provided after the turn-up part in the side part carcass 220 after the turn-up. Become,
The strength of the side portion carcass cord 221 after the turn-up,
The pneumatic tire is formed larger than the strength of the side portion carcass code (211) before the turn-up. The method of claim 1,
The side part carcass 220 is disposed after the turn-up for additional rigidity reinforcement in the side part flexion region H2, and the side part carcass cord 221 is provided after the turn-up part in the side part carcass 220 after the turn-up. Become,
After the turn-up side portion carcass code 221,
A pneumatic tire comprising a carcass cord having a greater strength than the tread portion carcass code 111 and the bead portion carcass code 311. The method of claim 2,
The strength of the side part carcass cord 211 before the turn-up, the side part carcass cord 221, the tread part carcass cord 111 and the bead part carcass cord 311 after the turn-up are:
A pneumatic tire derived through Equation 1 below.
<Equation 1>
Carcass code strength = Breaking force per 1 carcass cord x number of carcass cord strands per 1 inch (EPI: End Per Inch) delete The method according to any one of claims 1 to 3,
The carcass cord diameter of each part
Pneumatic tires that meet the diameter range larger than 0.6 mm and smaller than 1.0 mm.

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