KR102011072B1 - pneumatic tire - Google Patents

Abstract

The present invention relates to a pneumatic tire, comprising: a plurality of reinforcement protrusions protruding on a trailing portion sidewall surface facing the leading portion sidewall surface of the shoulder blocks facing each other around the shoulder lateral groove according to the tire driving direction; Heel and toe by reinforcing the stiffness of the shoulder blocks, by inducing a bending deformation of the shoulder blocks uniformly by causing the leading portion of the shoulder blocks to have greater rigidity than the trailing portion. ) Abnormal abrasion and thus noise generation can be suppressed so that the initial noise performance of the tire can be kept constant even after abrasion, and the reinforcement protrusions cross each other at the side wall surface of the leading part of the shoulder blocks and the side wall of the trailing part based on the horizontal groove Because it is protruding, the protrusion between the shoulder blocks by a plurality of reinforcement protrusions Can be prevented from occurring, and heat dissipation grooves are formed in the side wall surface of the leading portion and the side wall surface of the trailing portion of the plurality of shoulder blocks forming the tread shoulder pattern portion to more easily prevent internal heat generated by frictional resistance during braking. There is an effect that can be released to the outside.

Description

Pneumatic tire

The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire having a tread shoulder block structure that can reduce abnormal wear and noise generation of the tread shoulder block.

As is well known, the tire has a function of supporting a load of a vehicle, a function of absorbing and cushioning an impact from a road surface, transmitting a driving force and a braking force from the ground to the vehicle, changing a running direction, and maintaining a running direction.

Therefore, the tread portion of the tire is designed in various patterns to express the performance in various road conditions such as wet road, dry road, snow and ice road.

The tread pattern is the only part directly contacting the ground in the tire having various functions as described above, and accordingly, the development of the tread pattern is required according to the required performance of the tire.

When the vehicle is driven, the tires are grounded sequentially while contacting the ground, and in the process of grounding, the tread pattern is worn out by repeated friction and slip with the ground. Rather than uniform wear, irregular wear appears to be a problem.

In particular, the wear of the heel and toe is a bending deformation of the leading part and the trailing part in which the tires face each other with respect to the lateral groove when rolling. ) Due to the difference, if the wear of the heel and toe (Heel & Toe) occurs as described above leads to abnormal wear and piece wear of the tire, such abnormal wear and piece wear will reduce the life of the tire rapidly There is a problem.

In addition, design development to improve one performance in tire development should consider other performance and not impede trade-off performance.

Korean Utility Model Registration Publication No. 20-0135655 (published July 24, 1997)

The present invention for solving the above problems is the leading part of the shoulder blocks partitioned facing each other based on the shoulder lateral grooves of the tread shoulder pattern portion formed on both sides of the tire width direction of the tread portion for maintaining the stability and life of the tire Reinforce the stiffness of the part and the trailing part, but have different stiffness difference so that the bending deformation appears uniformly, and the heat generated from each of the blocks of the leading part and the trailing part can be better discharged. In addition, to provide a tread shoulder block structure for the tire to prevent the crushing phenomenon between the shoulder blocks of the tread shoulder pattern portion.

Pneumatic tire of the present invention for achieving the above object, the tread shoulder pattern portion is partitioned by the shoulder longitudinal groove along the edge on both sides of the tire width direction of the tread portion, the shoulder along the tire running direction on the tread shoulder pattern portion The plurality of shoulder blocks are partitioned by the horizontal grooves, and a plurality of reinforcement protrusions protrude on the trailing part side wall surface facing the leading part side wall surface of the shoulder blocks facing each other around the shoulder side groove according to the tire driving direction. The reinforcement protrusions may be formed such that the leading parts of the shoulder blocks have greater rigidity than the trailing parts.

Here, the reinforcing protrusions are preferably formed with a greater number of leading reinforcing protrusions formed on the side wall surface of the leading part of the shoulder blocks than the trailing reinforcing protrusions formed on the side wall surface of the trailing part of the shoulder blocks.

In addition, the leading portion reinforcement protrusions and the trailing portion reinforcement protrusions are preferably formed to alternately protrude along the longitudinal direction of the lateral groove.

In addition, the leading reinforcing protrusions and the trailing portion reinforcing protrusions preferably have the same cross-sectional shape and protrude in a columnar shape along the height direction.

In addition, the trailing portion reinforcement protrusions are formed to protrude within the range of 3 to 4 on the trailing portion side wall surface, it is preferable that the separation distance of the trailing portion reinforcement protrusions is 10mm or more.

In addition, it is preferable that a plurality of heat dissipation grooves extending along the height direction are formed at intervals along the length of the shoulder lateral groove on the leading part side wall surface and the non-projection surface of the trailing part side wall surface, respectively.

In addition, the width of the heat dissipation grooves is preferably made within the range of 0.5mm to 1mm.

In addition, the leading portion reinforcement protrusions and the trailing portion reinforcement protrusions are made in the form of a semi-circular column, the leading portion reinforcement protrusions and the trailing portion reinforcement protrusions are preferably made in a radius of 0.5mm to 1.5mm range.

The leading part reinforcement protrusions and the trailing part reinforcement protrusions are formed to have a step lower than the upper surface of the shoulder blocks, and the height difference between the leading part reinforcement protrusions and the trailing part reinforcement protrusions is in the range of 3 mm to 3.5 mm. It is preferable to be made within.

Pneumatic tire of the present invention is a shoulder block by a plurality of reinforcement protrusions protruding on the trailing portion side wall surface facing the leading portion side wall surface of the shoulder blocks facing each other around the shoulder lateral groove in the tire running direction To reinforce the rigidity of the shoulder blocks, but the number of leading reinforcement protrusions formed on the side wall surface of the leading part of the shoulder blocks is greater than the number of the trailing part reinforcement protrusions formed on the side wall surface of the trailing part of the shoulder blocks to lead the shoulder blocks. By additionally having a greater rigidity than the trailing portion to induce the bending deformation of the shoulder blocks uniformly by suppressing heel and toe abnormal wear and the resulting noise to reduce the initial noise of the tire It has the effect of keeping the performance constant even after abrasion.

In addition, since the reinforcement protrusions intersect with each other at the leading part side wall surface and the trailing part side wall surface of the shoulder blocks with respect to the lateral groove, it is possible to prevent the occurrence of crushing between the shoulder blocks by the plurality of reinforcing protrusions. Has an effect.

In addition, the heat dissipation grooves are formed on the leading side wall and trailing side walls of the plurality of shoulder blocks forming the tread shoulder pattern, so that the internal heat generated by the frictional resistance during braking can be more easily released to the outside. There is.

1 is a side view of a pneumatic tire for explaining the tread shoulder block structure of the present invention.
FIG. 2 is an isometric view of the tread shoulder pattern portion, in which the II portion of FIG. 1 is enlarged.
3 is a plan view of the tread shoulder pattern portion of FIG. 2.
4 is a side cross-sectional view taken along line IV-IV of FIG. 2.
5 is a cross-sectional view taken along the line VV of FIG. 4.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a side view of a pneumatic tire for explaining the tread shoulder block structure of the present invention.

Referring to FIG. 1, a tread portion 10 is formed on the outer circumference of the pneumatic tire 1 in frictional contact with the ground, and the tread portion 10 has appropriate driving performance and braking performance in accordance with the conditions of the driving road. And various types of tread patterns for implementing drainage performance.

The tread pattern structure formed on the tread portion 10 includes a plurality of longitudinal grooves 21, 23, and 31 formed along a running direction of the tire and a plurality of horizontal grooves 25, 26 formed along the width direction of the tire. 32) and the shape of the plurality of tread blocks 22, 24, 33 defined by them.

In particular, in the tread pattern, the tread shoulder pattern portion 30 is partitioned on both sides of the tread center pattern portion 20 by shoulder longitudinal grooves 31 formed along the tire width direction both edges of the tread portion.

On the other hand, the tread center pattern portion 20 is the center longitudinal groove 21 and the middle longitudinal grooves 23 and the center transverse grooves 25 and the middle transverse grooves 26, and the center blocks partitioned by them And middle block, but the present invention relates to the above-described tread shoulder pattern portion 30 can be applied to various modifications to the tread center pattern portion 20, but a separate illustration and detailed description thereof Is omitted.

FIG. 2 is an isometric view of the tread shoulder pattern portion, which is an enlarged view of part II of FIG. 1, and FIG. 3 is a plan view of the tread shoulder pattern portion of FIG. 2.

Referring to FIGS. 2 and 3, the tread shoulder pattern portion 30 includes shoulder lateral grooves 32 and a plurality of shoulder blocks 33 partitioned along the tire driving direction.

In particular, each of the shoulder blocks on the trailing portion sidewall surface 33b facing the leading portion sidewall surface 33a of the shoulder blocks 33 facing each other around the shoulder lateral groove 32 according to the tire traveling direction A plurality of reinforcing protrusions 35 for reinforcing the rigidity of 33 are protruded.

The leading part L refers to a part where the tire 1 first touches the ground when the shoulder 1 is driven, and the trailing part T is a late part.

On the other hand, the reinforcement protrusions 35 are preferably formed such that the leading portion (L) of the shoulder blocks 33 has a greater rigidity than the trailing portion (T).

As such, the plurality of reinforcement protrusions 35 protruding from the trailing portion sidewall surface 33b facing the leading portion sidewall surface 33a of the shoulder blocks 33 facing each other with respect to the shoulder lateral groove 32. Reinforce the bending stiffness of the shoulder blocks 33 by, but the shoulder block 33 so that the leading portion (L) of the shoulder blocks 33 has a greater rigidity than the trailing portion (T) By inducing a uniform bending deformation acting on the heel and toe (Heel and Toe) abnormal wear and the resulting noise can be suppressed.

In this embodiment, the leading part reinforcement formed on the side wall surface 33a of the leading part of the shoulder blocks 33 so that the leading part L of the shoulder blocks 33 has a greater rigidity than the trailing part T For example, the protrusions 35a may be formed in a greater number than the trailing part reinforcing protrusions 35b formed on the trailing part side wall surface 33b of the shoulder blocks 33.

Meanwhile, the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b have the same cross-sectional shape and protrude in a semicircular column shape along the height direction.

The trailing portion reinforcement protrusions 35b may be formed to protrude within 3 to 4 ranges at intervals along the longitudinal direction of the shoulder lateral groove 32 on the trailing portion sidewall surface 33b. Three trailing portion reinforcing protrusions (35b) is an example that is formed to project at intervals.

In this case, the separation distance g between the trailing part reinforcement protrusions 35b is preferably 10 mm or more based on when the entire width of the shoulder block is made within the range of 30 mm to 40 mm.

Here, when the distance g of the trailing reinforcement protrusions 35b is less than 10 mm, the interval between the reinforcement protrusions 35 becomes too narrow and the drainage performance of the tire is reduced, and the heat dissipation grooves 37 to be described later. The area of the non-projected sidewall surface for forming the smaller becomes a problem that the heat radiation efficiency of the shoulder block 33 is lowered.

Meanwhile, the leading part reinforcement protrusions 35a are formed at the same interval g as the trailing part reinforcement protrusions 35b, and the trailing part reinforcement protrusions along the length direction of the shoulder lateral groove 32. It has a larger number than 35b and alternately with the trailing portion reinforcement protrusions 35b to protrude from each other.

In the present exemplary embodiment, the leading part reinforcement protrusions 35a are alternately formed with the three trailing part reinforcement protrusions 35b, and four are formed to be alternately arranged in a staggered manner.

Preferably, the protruding radius r of the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b is within a range of 0.5 mm to 1.5 mm. .

Here, when the radius r of the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b is less than 0.5 mm, an effect of reinforcing the rigidity of the shoulder block 33 through the reinforcement protrusions 35 is provided. When the fall, if exceeding 1.5mm, interference between the reinforcing protrusions (35) is generated or there is a disadvantage that the drainage performance is drastically deteriorated due to narrowing (d) between them.

In addition, as described above, the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b are alternately formed along the longitudinal direction of the shoulder lateral groove 32 and protrude in a direction facing each other, thereby forming a shoulder. It is possible to reduce the spacing between the reinforcing protrusions 35 without degrading the drainage performance between the blocks 33 to have a crushing prevention effect to suppress the small gravel or rubble stuck between them.

4 is a side cross-sectional view taken along line IV-IV of FIG. 2, and FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4.

Referring to FIGS. 4 and 5, the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b have a height difference h lower than that of the upper surfaces of the shoulder blocks 33. Is formed.

The height difference h between the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b is preferably within a range of 3 mm to 3.5 mm.

Here, when the height difference h between the leading part reinforcement protrusions 35a and the trailing part reinforcement protrusions 35b is less than 3 mm, the upper end portions of the side wall surface parts 33a and 33b of the shoulder block 33 are rubbed to the ground. As the frictional force is concentrated on the upper end portions of the reinforcement protrusions 35 protruding from the city in the traveling direction, excessive abrasion or severe tearing occurs, and when the length exceeds 3.5 mm, the shoulder blocks 33 Since only the lower sidewall surface is reinforced, the reinforcing effect of the shoulder block 33 is inferior.

In addition, a plurality of heat dissipation grooves 37 extending along the height direction are formed on the non-projection surfaces of the leading part side wall surface 33a and the trailing part side wall surface 33b, respectively, in the longitudinal direction of the shoulder lateral groove 32. It may be formed at intervals along the.

Width f of the heat dissipation grooves 37 is preferably made within the range of 0.5mm to 1mm.

In this case, when the width f of the heat dissipation grooves 37 is less than 0.5 mm, the heat dissipation effect of the shoulder block 33 through the heat dissipation groove 37 is insufficient, and thus friction heat generated in the shoulder block 33 during driving and braking. The heat dissipation of the tires may not be sufficiently dissipated, and if it exceeds 1 mm, the stiffness of the shoulder blocks 33 may be drastically lowered, which may cause a reduction in the braking and handling performance of the tire.

Accordingly, the shoulder blocks 33 may more effectively release frictional heat inside the shoulder block 33 through the heat dissipation grooves 37 due to friction with the ground during driving.

As described above, the pneumatic tire according to the present embodiment has a trailing part side wall surface facing the leading part side wall surface 33a of the shoulder blocks 33 facing each other based on the shoulder lateral groove 32 in the tire driving direction ( Reinforce the rigidity of the shoulder blocks 33 by a plurality of reinforcement protrusions 35 protruding on the 33b), the leading portion (L) of the shoulder blocks 33 is the trailing portion (T) Induces even more bending deformation of the shoulder blocks 33 to have a greater rigidity, thereby suppressing heel and toe abnormal wear and subsequent noise, thereby reducing the initial noise of the tire. The performance can be kept constant even after abrasion, and the reinforcement protrusions 35 cross each other at the leading part side wall surface 33a and the trailing part side wall surface 33b of the shoulder blocks 33 with respect to the shoulder lateral groove. Because it is protruding Maintaining drainage performance but giving a gap therebetween to prevent crushing between the shoulder blocks 33, the leading side wall surface 33a and trailing side wall surface 33b of the shoulder blocks 33 Each of the heat dissipation grooves 37 is formed in the shoulder block 33 to have an effect of more easily dissipating heat to the outside.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It goes without saying that it belongs to the scope of the present invention.

1: pneumatic tire 10: tread portion
20: tread center pattern part 21: center bell groove
22: center block 23: middle bell groove
24: middle block 25: center horizontal groove
26: Middle groove 30: Tread shoulder pattern
31: Shoulder longitudinal groove 32: Shoulder horizontal groove
33: shoulder block 33a: leading part side wall surface
33b: trailing portion side wall surface 34: sipe
35: reinforcement protrusion 35a: leading part reinforcement protrusion
35b: trailing portion reinforcement projection 37: heat dissipation groove
D: Width of the cross groove d1: Width between the reinforcement protrusions
f: width of the heat dissipation groove g: distance between reinforcing protrusions
h: Reinforcement protrusion height difference L: Reading part
r: radius of reinforcement protrusion T: trailing part

Claims (7)

The tread shoulder pattern part is partitioned by the shoulder longitudinal groove along the edge of the tire width direction both sides of the tread part,
The tread shoulder pattern portion is divided into a plurality of shoulder blocks by shoulder lateral grooves along a tire driving direction,
A plurality of reinforcement protrusions are formed on the trailing part side wall surface facing the leading part side wall surface of the shoulder blocks facing each other around the shoulder lateral groove according to the tire driving direction,
The reinforcement protrusions are formed such that leading portions of the shoulder blocks have greater rigidity than the trailing portion,
And a plurality of heat dissipation grooves extending in a height direction on the non-projection surface of the leading part side wall surface and the trailing part side wall surface at intervals along the length of the shoulder lateral groove.
In claim 1,
The reinforcement protrusions,
And a larger number of leading reinforcement protrusions formed on the side wall surfaces of the shoulder blocks than the trailing reinforcement protrusions formed on the side wall surfaces of the trailing portions of the shoulder blocks.

In claim 2,
And the leading part reinforcing protrusions and the trailing part reinforcing protrusions are alternately formed to protrude from each other along the longitudinal direction of the lateral groove.
In claim 3,
The leading part reinforcement protrusions and the trailing part reinforcement protrusions have the same cross-sectional shape and protrude in a columnar shape along a height direction.
In claim 4,
The leading portion reinforcement protrusions and the trailing portion reinforcement protrusions are made of a semi-circular pillar shape,
The leading part reinforcement protrusions and the trailing part reinforcement protrusions have a radius of 0.5mm to 1.5mm range pneumatic tire.
In claim 4,
And the leading part reinforcement protrusions and the trailing part reinforcement protrusions are formed to have a step lower than an upper surface of the shoulder blocks.
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