KR20090032759A - Tread pattern of havy duty pneumatic radlal tire - Google Patents

Abstract

A tread pattern of a heavy-duty pneumatic radial tire is provided to improve the durability of tire as the offset wear of the rib edge is suppressed. A tread pattern of a heavy-duty pneumatic radial tire comprises: a first main longitudinal groove(110) formed the central part of tire along the columnar direction of tire; a second longitudinal groove(120) formed in both sides of first main longitudinal groove; a center rib(130) segmenting the first main longitudinal groove and the second longitudinal groove; and a shoulder rib(140) formed in order to be faced each other.

Description

Tread pattern of pneumatic radial tire for heavy load {TREAD PATTERN OF HAVY DUTY PNEUMATIC RADLAL TIRE}

The present invention relates to a tread pattern of a heavy-duty pneumatic radial tire, and to suppress the abrasion of the rib edge, to improve rain drainage and curb road running stability, and to further improve the durability of the tire. Relates to the tread pattern of.

As is well known, in order to improve the mileage in the conventional heavy-load pneumatic radial tire, it is designed with a large ground area and an ARRRESIVE pattern. This results in uneven wear, such as erosion wear, on the rib edge of conventional heavy-duty pneumatic radial tires. While the fuel consumption increases.

An object of the present invention for solving the above problems, the tread pattern of the heavy-duty pneumatic radial tire that can suppress the uneven wear of the rib edge, improve rain drainage and curve road stability, and further improve the durability of the tire To provide.

In order to achieve the above object, in the tread pattern of the heavy-load pneumatic radial tire of the present invention, a first main longitudinal groove is formed along the circumferential direction of the tire at a central portion in the width direction of the tire, and on both sides of the first main longitudinal groove portion. Each of the second longitudinal grooves is formed in parallel with each other, two center ribs defined by the first main longitudinal groove and the second main longitudinal groove, and two shoulder ribs are formed to be symmetric with each other, and the center rib and the shoulder The ribs are each formed with a sub longitudinal groove, a plurality of transverse grooves connected along the longitudinal direction of the sub longitudinal groove, and a plurality of sipes are formed along both edges of the center rib and the shoulder rib.

The distance GP1 between the first main longitudinal groove and the second main longitudinal groove is preferably formed to satisfy 0.20 TAW ≦ GP1 ≦ 0.35TAW relative to the tread curve width TAW.

The width GW1 of the first main bellows satisfies 0.053TAW ≦ GW1 ≦ 0.073TAW relative to the tread curve width TAW, and the width of the second main bellows GW2 corresponds to 0.060TAW ≦ tread of the tread curve width TAW. It is preferable that it is formed so as to satisfy GW2 ≦ 0.080TAW.

The first main bellows and the second main bellows may be formed such that both side surfaces thereof have stepped portions, and the width thereof becomes narrow toward the bottom surface.

 The maximum depth ASD of the first main bellows and the second main bellows is preferably formed to satisfy 0.7GW1 ≦ ASD ≦ 1.7GW1.

 The bottom surface of the first main longitudinal part and the bottom surface of the second main longitudinal part are formed concavely rounded, and the bottom surface of the first main longitudinal part and the bottom surface of the second main longitudinal part are the radius of curvature of the bottom surface. R1 may be made within a range of 2mm ≦ R1 ≦ 6mm.

 The depth ASD1 of the stepped portion of the first main vertical groove portion is preferably formed to satisfy 0.7ASD ≦ ASD1 ≦ 0.30ASD.

 The stepped portions of the second main longitudinal groove portion are formed to have different depths on both sides, and the depth ASD4 of the first side surface satisfies 0.35ASD ≦ ASD4 ≦ 0.75ASD, and the depth of the stepped portion ASD5 of the second side ) Is preferably formed to satisfy 0.25ASD ≦ ASD5 ≦ 0.65ASD.

 The second main longitudinal glue portion may be formed to have a wavy shape along the circumferential direction of the tire.

The horizontal grooves formed on the center ribs are formed to be alternately connected to each other on both sides of the sub longitudinal grooves along the circumferential direction of the tire, and the horizontal grooves formed on the shoulder ribs are formed to penetrate the sub longitudinal grooves laterally and be connected to each other. Can be.

 The sub longitudinal grooves and the horizontal grooves may be formed to have the same cross-sectional shape.

 The width GW3 of the sub longitudinal grooves and the lateral grooves is preferably formed so as to satisfy 0.060TAW ≦ GW3 ≦ 0.080TAW.

 The maximum depth ASD3 of the sub longitudinal grooves and the lateral grooves is preferably formed so as to satisfy 0.10ASD ≦ ASD3 ≦ 0.20ASD.

The bottom surfaces of the sub longitudinal grooves and the transverse grooves are rounded, and the radius of curvature R2 of the sub longitudinal grooves and the bottom grooves of the transverse grooves may be within a range of 2 mm ≦ R2 ≦ 6 mm.

 40 sipes may be formed per unit pitch of the tread pattern, and the width SW1 of the sipe that is connected to the first main groove and the second main longitudinal groove is 0.10 GW1 ≤ SW1 ≤ 0.30 GW1, and the sipe The depth ASD2 is preferably formed to satisfy 0.25ASD ≦ ASD2 ≦ 0.65ASD.

According to the tread pattern of the heavy-loaded pneumatic radial tire of the present invention, while effectively suppressing uneven wear, such as erosion wear (EROSON WEAR) of the rib edge, and improves the rain drainage and ride comfort without causing any deterioration in performance It aims to improve the driving stability of the curve road, and prevents the separation by segregation during unpaved driving, thereby improving the mileage and durability of the tire.

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 to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a partial cutaway perspective view showing a heavy-load pneumatic radial tire according to an embodiment of the present invention, Figure 2 is a plan view showing a tread pattern of the heavy-load pneumatic radial tire of FIG.

Referring to FIGS. 1 and 2, the overall shape of the pneumatic tire 1 according to the embodiment of the present embodiment is a sidewall part 20 and a bead on both sides of the tread part 10, respectively. The portions 30 are each extended.

The tread portion 10 is formed by layering the tread 11, the belt 12, the carcass ply 13, and the inner liner 14 sequentially from the upper side. The carcass ply 13 extends into the sidewall portion 20 and the bead portion 30 and serves as a skeleton of the tire. The bead part 30 is provided with a bead 32 wrapped by the end of the carcass ply 13 and an air fax 36 formed adjacent to the bead 34.

The rough shape of the tread pattern formed on the tread of the heavy-load pneumatic radial tire of the present embodiment includes three main longitudinal grooves 110 and 120 formed along the circumferential direction of the tire, and the main longitudinal grooves 110 and 110. It consists of four ribs 130 and 140 partitioned by the width direction of a tire by the 120. As shown in FIG.

First, the first main groove 110 is formed along the circumferential direction of the tire at the center portion in the width direction of the tire. On both sides of the first main longitudinal portion 110, the second longitudinal portion 120 is formed to be parallel to each other.

At this time, the distance GP1 between the first main longitudinal groove 120 and the second main longitudinal groove 120 is formed to satisfy 0.20 TAW ≦ GP1 ≦ 0.35TAW compared to the tread curve width TAW.

In addition, two center ribs 130 and two shoulder ribs 140 defined by the first main longitudinal groove 110 and the second main longitudinal groove 120 are formed to be symmetric with each other.

Each of the center rib 130 and the shoulder rib 140 is provided with one sub longitudinal groove 150, and a plurality of horizontal grooves connected in the width direction of the tire along the longitudinal direction of the sub longitudinal groove 150. 160 is formed.

The horizontal grooves 160 formed on the center ribs 130 are formed to be alternately connected to each other on both sides of the sub longitudinal grooves 150 along the circumferential direction of the tire.

In addition, the horizontal grooves 160 formed on the shoulder ribs 140 are formed to penetrate the sub longitudinal grooves 150 laterally and be connected to each other. In the present exemplary embodiment, the sub longitudinal grooves 150 and the horizontal grooves 160 are formed to have the same cross-sectional shape.

A plurality of sipes 170 and 180 are formed along both edges of the center rib 130 and the shoulder rib 140. In the present exemplary embodiment, 40 sipes 170 and 180 are formed per unit pitch of the tread pattern.

3 is a cross-sectional view of the first main longitudinal groove cut along the line A-A of FIG. 2.

Referring to FIG. 3, the first main longitudinal groove 110 is formed with the bottom surface 112 concavely rounded, and both sides have a stepped portion 114, and the width is narrow toward the bottom surface 112. It is formed to lose.

Here, the width GW1 of the first main bellows 110 is formed to satisfy 0.053TAW ≦ GW1 ≦ 0.073TAW relative to the tread curve width TAW, and the first main bellows portion and the second main bellows portion are formed. The maximum depth ASD is formed to satisfy 0.7GW1 ≦ ASD ≦ 1.7GW1.

In addition, the depth ASD1 of the stepped portion 112 of the first main longitudinal part 110 is formed to satisfy 0.7ASD ≦ ASD1 ≦ 0.30ASD, and the bottom surface (1) of the first main longitudinal part 110 is formed. The radius of curvature R1 of 112 is made within the range 2 mm ≦ R1 ≦ 6 mm.

4 is a cross-sectional view of the second main longitudinal groove cut along the line B-B of FIG. 2.

Referring to FIG. 4, the second main longitudinal groove 120 is formed with the bottom surface 122 concavely rounded like the first main longitudinal groove 110, and both side surfaces of the stepped portions 124 and 126. It is formed to be inclined so as to narrow the width toward the bottom surface (122).

Here, the width GW2 of the second main longitudinal groove 120 is formed to satisfy 0.060TAW ≦ GW2 ≦ 0.080TAW relative to the tread curve width TAW.

In addition, the maximum depth ASD of the second main longitudinal groove 120 may be formed to satisfy 0.7GW1 ≦ ASD ≦ 1.7GW1, similarly to the first main longitudinal groove 110, and the curvature of the bottom surface 122. The radius R1 is made within the range of 2mm ≦ R1 ≦ 6mm.

The stepped portions 124 and 126 of the second main longitudinal groove 120 are formed to have different depths on both sides, and the depth ASD4 of the stepped portion 124 of the first side is 0.35ASD ≦ ASD4 ≦ 0.75 The ASD is satisfied, and the depth ASD5 of the stepped portion 126 of the second side surface is formed to satisfy 0.25ASD ≦ ASD5 ≦ 0.65ASD.

As such, the width of the first main bellows 110 and the width of the second main bellows 120 may be 0.053TAW ≦ GW1 ≦ 0.073TAW and 0.060TAW ≦ GW2 ≦ 0.080TAW, respectively. do.

Here, when the first main longitudinal portion 110 width (GW1) and the second main longitudinal portion 120 width (GW2) is less than the above lower limit, the straight performance of the tire is lowered, wear resistance when the upper limit above the upper limit Will increase.

In addition, both side surfaces of the first main longitudinal part 110 and the second main longitudinal part 120 are formed to be inclined, respectively, and stepped portions 112, 124, and 126 are formed on both side surfaces, so that the road is driven by uneven roads. Prevents tire separation.

On the other hand, the second main longitudinal groove 120 is formed to have a wavy shape along the circumferential direction of the tire.

5 is a cross-sectional view of the sub longitudinal grooves and the lateral grooves cut along the line C-C of FIG. 2.

Referring to FIG. 5, the width GW3 of the sub longitudinal groove 150 and the horizontal groove 160 is preferably formed to satisfy 0.060TAW ≦ GW3 ≦ 0.080TAW.

 The maximum depth ASD3 of the sub longitudinal groove 150 and the lateral groove 160 may be formed to satisfy 0.10ASD ≦ ASD3 ≦ 0.20ASD.

The bottom surfaces 152 and 162 of the sub longitudinal groove 150 and the transverse groove 160 are rounded, and the radius of curvature of the bottom surfaces 152 and 162 of the sub longitudinal groove 150 and the transverse groove 160 is rounded. R2), like the first main longitudinal groove 110 and the second main longitudinal groove 120 described above, may be made within the range of 2mm ≦ R2 ≦ 6mm.

FIG. 6 is a cross-sectional view of the sipe taken along the line D-D of FIG. 2.

Referring to FIG. 6, the width SW1 of the sipe 170 connected to the first main longitudinal groove 110 and the second main longitudinal groove 120 satisfies 0.10 GW1 ≦ SW1 ≦ 0.30GW1. The depth ASD2 of the sipe is formed to satisfy 0.25ASD ≦ ASD2 ≦ 0.65ASD.

Meanwhile, the sipes 180 formed on the outer side of the shoulder rib 140 may have the same cross-sectional shape as the sipes 170 or may be formed differently.

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. In addition, it is natural that it belongs to the scope of the present invention.

1 is a partial cutaway perspective view showing a heavy-duty pneumatic radial tire according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a tread pattern of the heavy-load pneumatic radial tire of FIG. 1.

3 is a cross-sectional view of the first main longitudinal groove cut along the line A-A of FIG. 2.

4 is a cross-sectional view of the second main longitudinal groove cut along the line B-B of FIG. 2.

FIG. 5 is a cross-sectional view of a sub longitudinal groove and a horizontal groove cut along the line C-C of FIG. 2.

FIG. 6 is a cross-sectional view of the sipe taken along the line D-D of FIG. 2.

<Description of Main Reference Signs>

110: first main groove 112: bottom surface

114: step portion 120: second main longitudinal groove

122: bottom surface 124: first stepped portion

126: second step 130: center rib

140: shoulder rib 150: sub longitudinal groove

160: horizontal groove 152, 162: bottom surface

170, 180: sipe ASD; Maximum depth of the first and second main longitudinals

ASD1; Depth of step of first main longitudinal groove

ASD3: maximum depth of sub longitudinal groove and the transverse groove

ASD4, ASD5: depth of step of second main longitudinal groove

GP1: distance between first main longitudinal groove and main longitudinal groove

GW1: first main groove width

GW2: 2nd main longitudinal groove width

GW3; Sub longitudinal groove and transverse groove width

R1: Bottom curvature radius of the first and second main longitudinal grooves

R2: Bottom curvature radius of sub longitudinal grooves and transverse grooves

TAW: tread curve width

Claims (16)

A first main longitudinal groove is formed along the circumferential direction of the tire at the central portion in the width direction of the tire, Second longitudinal grooves are formed on both sides of each of the first main longitudinal grooves to be parallel to each other, Two center ribs divided by the first main longitudinal groove and the second main longitudinal groove, and the two shoulder ribs are formed to be symmetric with each other, Each of the center ribs and the shoulder ribs is provided with a sub longitudinal groove, and a plurality of horizontal grooves connected along the longitudinal direction of the sub longitudinal groove are formed. A tread pattern of a heavy-duty pneumatic radial tire having a plurality of sipes formed along both edges of the center rib and the shoulder rib. In claim 1, The tread pattern of the heavy-loaded pneumatic radial tire satisfying the distance GP1 between the first main longitudinal groove and the main longitudinal groove is 0.20 TAW ≦ GP1 ≦ 0.35TAW relative to the tread curve width TAW. In claim 1, The width GW1 of the first main longitudinal part satisfies 0.053TAW ≦ GW1 ≦ 0.073TAW compared to the tread curve width TAW, The width GW2 of the second main longitudinal part of the tread pattern of the heavy-loaded pneumatic radial tire satisfying 0.060 TAW ≦ GW2 ≦ 0.080TAW relative to the tread curve width TAW. In claim 3, The first main bellows and the second main bellows, the tread pattern of the heavy-loaded pneumatic radial tire is formed to be inclined so that both sides have a stepped portion and the width narrows toward the bottom surface. In claim 4, The maximum depth ASD of the said 1st main bellows part and the said 2nd main bellows part satisfy | fills 0.7GW1 <= ASD <1.7GW1, The tread pattern of the heavy-load pneumatic radial tire. In claim 5, A bottom surface of the first main longitudinal part and a bottom surface of the second main longitudinal part are formed concavely rounded, Tread pattern of the heavy-loaded pneumatic radial tire of the bottom surface of the first main bellows portion and the bottom surface of the second main bellows portion has a radius of curvature R1 of 2 mm ≦ R1 ≦ 6 mm. In claim 6, The tread pattern of the heavy-load pneumatic radial tire which satisfy | fills the depth ASD1 of the step part of the said 1st main longitudinal-groove part 0.7ASD <= ASD1 <0.30ASD. In claim 6, The stepped portions of the second main longitudinal glue portion are formed to have different depths on both sides, The depth ASD4 of the stepped portion of the first side satisfies 0.35ASD ≦ ASD4 ≦ 0.75ASD, The tread pattern of the heavy-duty pneumatic radial tire which satisfy | fills the depth ASD5 of the step part of a 2nd side satisfying 0.25ASD <= ASD5 <0.65ASD. In claim 8, The tread pattern of the heavy-load pneumatic radial tire is formed so as to have a wavy shape along the circumferential direction of the tire. In claim 5, The lateral grooves formed on the center ribs are formed to be alternately connected to each other on both sides of the sub longitudinal grooves along the circumferential direction of the tire, The lateral grooves formed on the shoulder ribs are formed to penetrate the sub longitudinal grooves laterally to be connected to each other. In claim 10, The tread pattern of the heavy-loaded pneumatic radial tire having the same cross-sectional shape of the sub longitudinal groove and the lateral groove. In claim 11, The width | variety (GW3) of the said sub longitudinal groove and the said horizontal groove is a tread pattern of the pneumatic radial tire for heavy loads which satisfy 0.060TAW <= GW3 <0.080TAW. In claim 12, The maximum depth (ASD3) of the sub-groove and the lateral groove is 0.10ASD ≦ ASD3 ≦ 0.20ASD. The tread pattern of the heavy-duty pneumatic radial tire. In claim 13, The sub longitudinal groove and the bottom surface of the horizontal groove are formed rounded, The radius of curvature R2 of the sub longitudinal grooves and the bottom surface of the lateral grooves is within the range of 2 mm ≤ R2 ≤ 6 mm. In claim 5, The sipe is a tread pattern of a heavy-loaded pneumatic radial tire is formed 40 per unit pitch of the tread pattern. The method of claim 15, The width SW1 of the sipe connected to the first main longitudinal groove and the second main longitudinal groove is 0.10 GW1 ≤ SW1 ≤ 0.30 GW1, The depth of the sipe (ASD2) is tread pattern of the heavy-duty pneumatic radial tire that satisfies 0.25ASD ≤ ASD2 ≤ 0.65ASD.

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