KR101029033B1 - Havy duty pneumatic tire - Google Patents

Abstract

The present invention relates to a pneumatic tire for a heavy load, the center block extending in the circumferential direction in the center of the width direction of the tire; A middle block each partitioned on both sides of the tire width direction by a center longitudinal groove from the center block and extending along the tire circumferential direction; And a shoulder block each partitioned from the middle block by the middle longitudinal groove to the outside of the tire width direction and extending along the tire circumferential direction, and formed along the tire circumferential direction at the center of the center block; And a plurality of middle horizontal grooves inclined along the width direction of the tire in the middle block and extending in an oblique shape to divide into unit middle blocks in a tire circumferential direction, the middle horizontal grooves extending from one end to the center of the middle block. A first middle horizontal groove portion extending; A second middle horizontal groove portion which is equally inclined at intervals in the circumferential direction of the first middle horizontal groove portion and the tire and extends from the tile side end portion of the middle block to the center portion; And a third middle horizontal groove portion formed along the circumferential direction of the tire and connecting the end portions of the first middle horizontal groove portion and the second middle block at the middle block center portion.

Accordingly, the heavy-load pneumatic tire of the present invention can reduce abnormal wear occurring at the shoulder portion of the tire, improve rain drainage and ride comfort, improve driving stability when cornering, and improve tire durability and mileage. Has

Heavy duty pneumatic tires, longitudinal grooves, lateral grooves, center lateral grooves, middle lateral grooves.

Description

Heavy Load Pneumatic Tires {HAVY DUTY PNEUMATIC TIRE}

The present invention relates to a pneumatic tire for a heavy load, and more particularly, to reduce abnormal wear occurring at the shoulder of the tire, to improve rain drainage and ride comfort, to improve driving stability when cornering, and to improve durability and mileage of the tire. A heavy load pneumatic tire having a tread pattern that can be improved.

As is well known, conventional heavy load pneumatic tires have a pattern designed to have a wide ground width and deep groove depth to improve mileage.

Accordingly, due to the shaking of the blocks partitioned by the grooves, uneven wear such as irregular or erosion wear occurs in the block, a ride comfort is reduced, abnormal wear occurs, and tire durability and mileage are reduced. This will occur.

An object of the present invention for solving the above problems is, in more detail, effectively reduce abnormal wear occurring in the shoulder portion of the tire, improve rain drainage and ride comfort, improve the curve road running stability, improve tire durability and mileage It is to provide a heavy-duty pneumatic tire having a tread pattern that can be made.

Heavy-load pneumatic tire of the present invention for achieving the above object, the center block extending in the circumferential direction in the center of the width direction of the tire; A middle block each partitioned on both sides of the tire width direction by a center longitudinal groove from the center block and extending along the tire circumferential direction; And a shoulder block each partitioned from the middle block by the middle longitudinal groove to the outside of the tire width direction and extending along the tire circumferential direction, and formed along the tire circumferential direction at the center of the center block; And a plurality of middle horizontal grooves inclined along the width direction of the tire in the middle block and extending in an oblique shape to divide into unit middle blocks in a tire circumferential direction, the middle horizontal grooves extending from one end to the center of the middle block. A first middle horizontal groove portion extending; A second middle horizontal groove portion which is equally inclined at intervals in the circumferential direction of the first middle horizontal groove portion and the tire and extends from the tile side end portion of the middle block to the center portion; And a third middle horizontal groove portion connecting the ends of the first middle horizontal groove portion and the second middle block at the center of the middle block and formed along the circumferential direction of the tire.

 The middle horizontal groove may have a first sipe formed at a predetermined depth on a bottom surface of the third middle horizontal groove portion and a portion of a bottom surface of the first middle horizontal groove portion and the second middle horizontal groove portion adjacent to the third middle horizontal groove portion. have.

 It may further include a sipe metal plate that is inserted and fixed inside the first sipe.

 At both ends of the middle longitudinal groove, a first extension portion may be further formed in which widths of the first middle horizontal groove portion and the second middle horizontal groove portion are expanded.

 The first extension part may be formed by chamfering an acute corner portion of the unit middle blocks partitioned in a trapezoidal shape by a middle horizontal groove.

 Both side walls of the center longitudinal groove and the middle longitudinal groove are formed to be inclined so as to have a narrow width toward the bottom surface, and the bottom surface of the center longitudinal groove and the middle longitudinal groove may be formed along the circumferential direction with a waveform in the width direction of the tire. .

 A plurality of second sipes may be formed at predetermined intervals along the circumferential direction of the tire at edges of the center block, the middle block, and the shoulder block facing each other with the middle longitudinal groove and the middle longitudinal groove interposed therebetween.

 In the center block is inclined along the width direction of the tire and is formed extending in an oblique shape to include a plurality of center horizontal grooves for partitioning the unit center blocks in the circumferential direction of the tire, the center horizontal groove is a semi longitudinal groove at one end of the center block A first center horizontal groove portion extending to; And a second center lateral groove portion extending from the tile side end of the middle block to the semi longitudinal groove at intervals in the circumferential direction of the first center lateral groove and the tire.

 At both ends of the center horizontal groove may include a second extension portion formed by extending the width of the first center horizontal groove portion and the second center horizontal groove portion.

 The second extension portion may be formed by chamfering an acute edge portion of the unit middle blocks divided into a trapezoidal shape by a center horizontal groove.

The distance G1 from the widthwise center of the tire to the center of the center longitudinal groove is preferably 0.01 TAW? GP1? 0.25 TAW.

The distance G2 from the widthwise center of the tire to the center of the middle longitudinal groove is preferably 0.16TAW? GP2? 0.45TAW.

 The width GW1 of the center longitudinal groove and the width GW2 of the middle longitudinal groove are preferably 0.026TAW = GW1 and GW2 = 0.082TAW, respectively.

 The depth A of the center longitudinal groove and the depth D of the middle longitudinal groove are preferably 0.5 GW1 = A and D = 1.5 GW, respectively.

 It is preferable that both side walls of the center longitudinal groove and the middle longitudinal groove are rounded and inclined, and the radiuses of curvature R1 and R2 of the both sides of the center longitudinal groove and the middle longitudinal groove are 20 mm = R1, R2 = 200 mm.

The bottom surface of the center longitudinal groove and the middle longitudinal groove is formed concavely rounded, and the radius of curvature R3 of the bottom surface is preferably 0.2 mm = R3 = 10 mm.

 Middle lateral groove width (C3) is 0.01 GW1 = C3 = 0.7 GW1, the depth (B3) of the middle lateral groove is preferably 0.01 A = B3 = 1.5 A.

 The bottom surface of the middle lateral groove is formed concavely rounded, and the curvature R5 of the middle lateral groove bottom surface is preferably 0.2 mm = R5 = 10 mm.

 It is preferable that the width | variety C2 of a semi longitudinal groove is 0.01 GW1 = C2 '= 0.7GW1, and the depth B2 of a semi longitudinal groove is 0.01A = B2 = 1.5A.

 The bottom surface of the semi longitudinal groove is formed concavely rounded, and the bottom surface curvature R4 of the semi longitudinal groove is preferably 0.2mm = R4 = 10mm.

 The center lateral groove width C4 is preferably 0.01 GW1 = C4 = 0.7 GW1, and the depth B4 of the center lateral groove is preferably 0.01 A = B4 = 1.5 A.

 The bottom surface of the center lateral groove is formed concavely rounded, and the curvature R6 of the middle lateral groove bottom surface is preferably 0.2 mm = R6 = 10 mm.

The heavy-load pneumatic tire of the present invention has the effect of increasing the rigidity of both shoulder portions and increasing the contact area ratio of the shoulder block to prevent abnormal wear of the shoulder portion.

In addition, the heavy-load pneumatic tire of the present invention has the effect of improving the running stability of the tire by designing a wider tread width and ground area than the conventional standard.

In addition, the heavy-load pneumatic tire of the present invention by designing a large tread curvature to increase the shoulder ground pressure, has the effect of improving the running safety during cornering.

In addition, the heavy-load pneumatic tire of the present invention by reducing the depth of the longitudinal grooves and the lateral grooves compared to the same use and the same standard, thereby reducing the flow between blocks to improve the durability and mileage of the tire Have

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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

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

Referring to FIGS. 1 and 2, the overall shape of the pneumatic tire 1 of the present embodiment has sidewall portions 20 on both sides of the tread portion 10, respectively. ), The shoulder portion 30 and the bead portion 40 are each formed extending.

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 is stacked on the inner liner 14 and extends to the shoulder part 20, the side wall part 30, and the bead part 40 and serves as a skeleton of the tire.

And the bead part 40 is equipped with the bead 41 which is wrapped by the edge part of the carcass ply 13, and the air fax 43 formed adjacent to this bead 41. As shown in FIG.

The tread pattern 100 formed on the tread 11 of the heavy-load pneumatic tire 1 of the present embodiment mainly includes a center block CB, a center bell groove CG, a middle block MB, and a middle bell groove ( MG), a shoulder block SB, a semi longitudinal groove SG, and a middle lateral groove HG1.

The center block CB is formed to extend in the circumferential direction at the center in the width direction of the tire.

The center longitudinal groove CG is formed to extend along the circumferential direction of the tire with a predetermined width and depth at both sides of the center block CB.

Here, it is preferable that the distance GP1 from the width direction center line CL of a tire to the center line BCL1 of the center longitudinal groove CG is 0.01TAW <= GP1 <0.25TAW.

Here, TAW is a tread curve width, and the width of the center block CB is too narrow when the distance GP1 from the width direction centerline CL of the tire to the centerline BCL1 of the center longitudinal groove CG is less than 0.01TAW. The straight running performance is reduced.

And, if the distance GP1 from the width direction centerline CL of the tire to the center longitudinal groove CG is more than 0.25 TAW, the width of the center block CB is formed too wide to cause wear of the center block quickly and the tire The drainage performance of is lowered.

The middle block MB is partitioned from the center block CB on both sides in the width direction of the tire by the center longitudinal groove CG and extends along the tire circumferential direction.

The middle longitudinal groove MG is formed to extend along the circumferential direction in the width direction outer side of the tire of each middle block MB.

And the shoulder block SB is partitioned in the tire width direction outer side of each middle block MB by each middle longitudinal groove MG.

On the other hand, the distance GP2 from the widthwise center CL of the tire to the centerline BCL2 of the middle longitudinal groove MG is preferably 0.16 TAW? GP2? 0.45 TAW.

Here, when the distance GP2 from the widthwise center CL of the tire to the centerline BCL2 of the middle longitudinal groove MG is less than 0.16 TAW, the width of the shoulder block SB is formed so narrow that the rigidity of the shoulder block is achieved. Steering performance is reduced due to degradation.

And when the distance G2 from the width direction center line CL of the tire to the center line BCL2 of the middle longitudinal groove MG exceeds 0.45TAW, the width of the shoulder block SB is formed too wide and abnormal wear occurs. And the running performance of the tire is reduced.

3 is a side cross-sectional view of the center longitudinal groove and the middle longitudinal groove cut along the line III-III of FIG. 2.

Referring to FIG. 3, both side walls constituting the center longitudinal groove CG, that is, both side walls GS1 and GS2 of the center block CB and the middle block MB, have a narrow width toward the bottom surface GB. It is formed to be inclined so as to form a wave in the width direction of the tire and is formed along the circumferential direction.

As such, the bottom surface GB of the center longitudinal groove CG forms a wave shape along the circumferential direction of the tire and is zigzag, thereby improving the soil discharging performance and the stone discharge performance during driving.

On the other hand, it is preferable that the width GW1 of the center longitudinal groove CG is 0.026 TAW = GW1 = 0.082 TAW, and the depth A of the center longitudinal groove CG is 0.5 GW1 = A = 1.5 GW.

Here, when the width GW1 of the center longitudinal groove CG is less than 0.026 TAW, the drainage performance of the tire decreases, and when the width exceeds 0.082 TAW, wear of the tire proceeds quickly.

When the depth A of the center longitudinal groove CG is less than 0.5 GW1, wear of the tire proceeds quickly. When the depth A of the center longitudinal groove CG exceeds 1.5 GW1, the shaking of the center block CB is reduced. It becomes severe and abnormal wear occurs.

In addition, both side walls GS1 and GS2 of the center longitudinal groove CG are rounded and inclined with a predetermined curvature.

As such, both wall surfaces GS1 and GS2 of the center longitudinal groove CG have a rounded curved shape, so that even if stone jamming occurs while the tire is running, the contact area with the stone can be reduced to easily discharge the stone.

 Here, it is preferable that the curvature radii R1 and R2 of the both side wall surfaces GS1 and GS2 of the center longitudinal groove CG are 20 mm = R1, R2 = 200 mm, respectively.

 If R1 and R2 are less than 20 mm, the width GW1 of the center longitudinal groove CG becomes too narrow, and drainage and stone discharge property are reduced, and when it exceeds 200 mm, the stone discharge effect is reduced by approaching a straight line rather than a curved surface.

In addition, the bottom surface GB of the center longitudinal groove CG is formed concavely rounded, and the radius of curvature R3 of the bottom surface CB is preferably 0.2 mm = R3 = 10 mm.

Here, when R3 is less than 0.2mm or more than 10mm, corners are formed at both sides of the bottom surface, and stress is concentrated at the lower ends of the center block CB and the middle block MB, causing tearing.

Similar to the center longitudinal groove CG, the middle longitudinal groove MG is formed to be inclined so that both side walls GS1 and GS2 constituting the middle longitudinal groove MG become narrow toward the bottom surface GB. It forms a waveform in the width direction and is formed along the circumferential direction.

The width GW2 of the middle longitudinal groove MG is 0.026 TAW = GW2 = 0.082 TAW, and the depth A of the middle longitudinal groove MG is preferably 0.5 GW1 = D = 1.5 GW.

In addition, both side walls GS1 and SG2 of the middle longitudinal groove MG are rounded and formed to be inclined. The middle longitudinal grooves MG have a radius of curvature R1 and R2 of the both side walls GS1 and GS2 of 20 mm = R1, It is preferred that R2 = 200 mm.

In addition, the bottom surface GS of the middle longitudinal groove MG is formed concavely rounded, and the radius of curvature R3 of the bottom surface is preferably 0.2 mm = R3 = 10 mm.

In the present embodiment, the middle longitudinal groove MG is illustrated to be formed in the same manner as the center block SG, but the present invention is not limited thereto. Of course it is.

Referring to FIG. 2 again, the semi longitudinal grooves SG are formed to extend along the circumferential direction of the tire at the center of the center block CB.

As such, the semi-long groove SG is formed at the center of the center block CG to improve the straight running performance and the drainage performance of the tire.

4 is a side cross-sectional view of the semi longitudinal groove cut along the line IV-IV of FIG. 2.

Referring to FIG. 4, it is preferable that the width C2 of the semi-long groove SG is 0.01 GW1 = C2 = 0.7 GW1, and the depth is 0.01 A = B2 = 1.5 A.

If the width (C2) of the semi-longitudinal groove (SG) is less than 0.01 GW1, the semi-longitudinal groove (SG) cannot serve as a semi-longitudinal groove, and if the width (C2) of the semi-longitudinal groove (SG) is greater than 0.7 GW1, Abnormal wear occurs in the center.

In addition, when the depth B2 of the semi-long groove SG is less than 0.01 A, drainage performance may be lowered.

In addition, the bottom surface GB2 of the semi longitudinal groove SG is formed to be concavely rounded, and the curvature R4 of the bottom surface GB2 of the semi longitudinal groove SG is preferably 0.2 mm = R4 = 10 mm.

Here, when the curvature R4 of the semi longitudinal grooves SG bottom surface GB2 is less than 0.2 mm or exceeds 10 mm, corners are formed at both sides of the bottom surface GB2 to form the bottom surface of the semi longitudinal grooves SG. Stress is concentrated on the corners and tearing occurs.

Referring to FIG. 2 again, the middle lateral groove HG1 is inclined along the width direction of the tire on the middle block MB and is formed to extend in an oblique shape so as to be divided into unit middle blocks MB1 in the tire circumferential direction. Is formed.

The middle horizontal groove HG1 is subdivided to include a first middle horizontal groove part HG11, a second middle horizontal groove part HG12, and a third middle horizontal groove part HG13.

The first middle horizontal groove portion HG11 extends from one end of the middle block MB to the center portion.

The second middle horizontal groove portion HG12 alternates with the first middle horizontal groove portion HG11 at intervals in the circumferential direction of the tire and is formed to extend from the tile side end portion of the middle block MB to the center portion in the same inclined manner.

The third middle lateral groove portion HG13 connects the end portions of the first middle lateral groove portion HG11 and the second middle lateral groove portion HG12 at the center of the tire width direction of the middle block MB, and forms the circumference of the tire. Formed along the direction.

FIG. 5 is a side cross-sectional view of the middle lateral groove cut along the line VV of FIG. 2, and FIG. 6 is a side sectional view of the middle lateral groove cut along the line VI-VI of FIG. 2.

5 and 6, the width C3 of the middle lateral groove HG1 is 0.01 GW1 = C3 = = 0.7 GW1, and the depth B3 of the middle lateral groove HG1 is 0.01 A = B3 = 1.5. It is preferable that it is A.

Here, when the width C3 of the middle horizontal groove HG1 is less than 0.01 GW1, it cannot serve as the middle horizontal groove HG1, and the width C3 of the middle horizontal groove HG1 is greater than 0.7 GW1. Abnormal wear occurs.

Further, when the depth B3 of the middle lateral groove HG1 is less than 0.01A, the drainage performance is lowered.

In addition, the bottom surface GB3 of the middle lateral groove HG1 is also formed to be concave round, and the curvature R5 of the bottom lateral groove HG1 bottom surface GB3 is preferably 0.2 mm = R5 = 10 mm.

Here, when the curvature R5 of the middle lateral groove HG1 bottom surface GB3 is less than 0.2 mm or more than 10 mm, stress is concentrated at both corners of the bottom surface, thereby causing tearing.

The middle horizontal groove HG1 includes the bottom surface GB3 of the third middle horizontal groove part HG13, and the first middle horizontal groove part HG11 and the second middle adjacent to the third middle horizontal groove part HG13. The first sipe S1 is formed to have a predetermined depth H at a portion of the bottom surface of the horizontal groove portion HG12.

In addition, the sipe metal plate S11 is fitted and fixed inside the first sipe S1.

Sipe metal plate (S11) serves to improve the traction by friction with the ground when the middle block (MB) is all worn out.

Referring to FIG. 2 again, the first extension part (1) in which the widths of the first middle lateral groove portion HG11 and the second middle lateral groove portion HG12 are expanded at both end portions of the tire longitudinal direction MB in the tire width direction. GD1) is formed.

The first extension part GD1 is formed to have a wider width by chamfering the acute corner portions of the unit middle blocks MB1 defined in a trapezoidal shape by the middle lateral groove HG1.

FIG. 7 is a side cross-sectional view illustrating an extension of the middle lateral groove cut along the line VII-VII of FIG. 2, and FIG. 8 is a side cross-sectional view of an extension of the middle lateral groove seen along the line VII-X of FIG. 2. to be.

Referring to FIGS. 7 and 8, it is preferable that the distance F1 from the inner end of the first extension portion GD1 to the center of the bottom surface of the center longitudinal groove CB is 0.13A = F 1 = GW1. .

If the distance F1 from the inner end of the first extension portion GD1 to the center of the bottom surface GD of the center longitudinal groove CG or the middle longitudinal groove MG is less than 0.13A, the center longitudinal groove CG or middle The stone ejection performance of the bottom surface GB of the longitudinal groove MG decreases, and if it exceeds GW1, cracks may be generated at both edges of the center longitudinal groove CG or the bottom surface GB of the middle longitudinal groove MG. do.

 Referring back to FIG. 2, the edges of the center block CB, the middle block MB, and the shoulder block SB facing each other with the center longitudinal groove CG and the middle longitudinal groove MG interposed therebetween. A plurality of second sipes S2 are formed at predetermined intervals along the circumferential direction of the tire, respectively.

Here, the second sipes S2 are formed within a range of 20 to 30 in the unit pitch P1 of the tread pattern, so that the driving performance and running stability of the tire may be improved.

Hereinafter, a heavy load pneumatic tire according to a second embodiment of the present invention will be described with reference to the accompanying drawings, and the same and similar parts as those of the first embodiment will be denoted by the same reference numerals and will not be repeated. .

9 is a plan view showing a tread pattern of a heavy-load pneumatic tire according to a second embodiment of the present invention.

Referring to FIG. 9, the heavy-load pneumatic tire 1 according to the present embodiment differs from the configuration in which the center lateral groove HG2 is further formed on the center block CB as compared with the first embodiment described above. Have

The center lateral groove HG2 is inclined along the width direction of the tire on the center block CB and extends in a diagonal form, and divides the unit center blocks CB1 in the circumferential direction of the tire between the semi longitudinal grooves SG. It consists of the 1st center horizontal groove part HG21 and the 2nd center horizontal groove part HG22.

That is, the first center horizontal groove portion HG21 extends from one end of the center block CB to the semi longitudinal groove SG.

The second center horizontal groove portion HG22 alternates with the first center horizontal groove portion HG21 at intervals in the circumferential direction of the tire and extends from the tile side end of the center block CB to the semi longitudinal groove SG.

The second extension part (2) in which the widths of the first center horizontal groove part HG21 and the second center horizontal groove part HG22 are expanded similarly to the middle horizontal groove HG1 described above at both ends of the center horizontal groove HG2. GD2) is formed.

Here, the second extension part GD2 is formed by chamfering the acute corners of the unit middle blocks CB1 partitioned in a trapezoidal shape by the center horizontal groove HG2.

FIG. 10 is a side cross-sectional view of the center lateral groove cut along the line VII-VII of FIG. 9, and FIG. 11 is a side cross-sectional view showing the extension of the center lateral groove cut along the line XI-XI of FIG. 9, and FIG. 12. Fig. 9 is a side cross-sectional view showing the extension of the center lateral groove cut along the line II-II of Fig. 9.

Referring to FIGS. 10 and 12, the width C4 of the center horizontal groove HG2 is 0.01 GW1 = C4 = 0.7 GW1, and the depth B4 of the center horizontal groove HG2 is 0.01 A = B4 = 1.5. It is preferable that it is A.

Here, when the width C4 of the center horizontal groove HG2 is less than 0.01 GW1, the center horizontal groove HG2 cannot function as the center horizontal groove HG2. When the width C4 of the center horizontal groove HG2 exceeds 0.7 GW1, Abnormal wear occurs.

Further, when the depth B4 of the center lateral groove HG2 is less than 0.01 A, the drainage performance is lowered.

In addition, the bottom surface GB4 of the center horizontal groove HG1 is also formed to be concave round, and the curvature R6 of the center horizontal groove HG1 bottom surface GB3 is preferably 0.2 mm = R6 = 10 mm.

Here, when the curvature R6 of the center horizontal groove HG2 bottom surface GB4 is less than 0.2 mm or more than 10 mm, stress is concentrated at both corners of the bottom surface, thereby causing tearing.

The distance F2 from the inner end of the first extension portion GD to the center of the bottom surface of the center longitudinal groove CB is preferably 0.13A = FA2 = GW1.

If the distance F from the inner end of the first extension portion GD to the center of the bottom surface GD of the center longitudinal groove CG is less than 0.13A, the stone is discharged from the bottom surface GD of the center longitudinal groove CG. The performance is degraded, and if it exceeds GW1, cracks are generated at both edges of the bottom surface GB of the center longitudinal groove CG.

As such, the heavy-load pneumatic tire 1 of the present invention forms a tape S2 at the mold end of the shoulder portion 20 of the tire, that is, the end of the shoulder block SB, and the rigidity of both shoulder portions 20. In addition to increase the ratio of the contact area of the shoulder block (SB) to prevent abnormal wear of the shoulder block (SB).

In addition, the heavy-load pneumatic tire 1 of the present invention can improve the running stability of the tire by designing a tread width and a large ground area compared to the same standard.

In addition, the heavy-load pneumatic tire 1 of the present invention is designed to increase the tread curvature to increase the ground pressure of the shoulder portion 20, it is possible to improve the running safety when cornering.

In addition, the heavy-load pneumatic tire (1) of the present invention can improve the durability and mileage of the tire by reducing the fluidity between the blocks by reducing the depth of the longitudinal grooves and transverse grooves compared to the conventional use and the same specifications. have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. And it goes without saying that they belong to the scope of the present invention.

1 is a partial cutaway perspective view of a pneumatic tire for a heavy load according to a first embodiment of the present invention.

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

3 is a side cross-sectional view of the center longitudinal groove and the middle longitudinal groove cut along the line III-III of FIG. 2.

4 is a side cross-sectional view of the semi longitudinal groove cut along the line IV-IV of FIG. 2.

FIG. 5 is a side cross-sectional view of the middle lateral groove cut along the line VV of FIG. 2.

FIG. 6 is a side cross-sectional view of the middle lateral groove cut along the line VI-VI of FIG. 2.

FIG. 7 is a side cross-sectional view illustrating an extension of the middle lateral groove cut along the line VII-VII of FIG. 2.

FIG. 8 is a side cross-sectional view illustrating an extension of the middle lateral groove cut along the line VII-VII of FIG. 2.

9 is a plan view showing a tread pattern of a heavy-load pneumatic tire according to a second embodiment of the present invention.

10 is a side cross-sectional view of the center lateral groove cut along the line VII-VII of FIG. 9.

FIG. 11 is a side cross-sectional view showing an extension of the center lateral groove cut along the line XI-XI of FIG. 9.

FIG. 12 is a side cross-sectional view showing an extension of the center lateral groove cut along the line II-II of FIG. 9.

<Description of Main Reference Signs>

1: Pneumatic tire for heavy load 10: Tread part

100: tread pattern 20: shoulder portion

30: side wall part 40: bead part

A: depth of center longitudinal groove B2: depth of semi longitudinal groove

B3: depth of middle lateral groove B4: depth of center lateral groove

C2: width of semi-long groove C3: width of middle lateral groove longitudinal groove

C4: Width of center lateral groove CB: Center block

CB: center longitudinal groove D: depth of middle longitudinal groove

GB: Bottom surface of center and middle longitudinal grooves

GD1: first extension GD2: second extension

GP1: Distance to center bell groove

GP2: Distance to middle longitudinal groove

GS1, GS2: Walls on both sides of the center and middle longitudinal grooves

GW1: center longitudinal groove width GW2: middle longitudinal groove width

HG1: Middle horizontal groove HG11: First middle horizontal groove

HG12: 2nd middle horizontal groove part HG13: 3rd middle horizontal groove

HG2: Center Groove HG21: First Center Groove

HG21: 1st center horizontal groove part MB: Middle block

MG: Middle longitudinal groove TAW: Tread curve width

R1, R2: Curvature of both side walls of longitudinal groove and middle longitudinal groove

R3: Curvature of the bottom surface of the center longitudinal groove and the middle longitudinal groove

SB: shoulder block SG: semi longitudinal groove

Claims (25)

A center block extending in the circumferential direction at the center in the width direction of the tire; A middle block which is respectively divided on both sides of the tire width direction by a center longitudinal groove from the center block and extends along the tire circumferential direction; And A shoulder block which is respectively partitioned from the middle blocks by middle longitudinal grooves in the tire width direction outside and extends along the tire circumferential direction, A semi-long groove formed along the tire circumferential direction at the center of the center block; And A plurality of middle horizontal grooves inclined along the width direction of the tire in the middle block and extending in an oblique shape to divide into unit middle blocks in a tire circumferential direction, The middle horizontal groove, A first middle horizontal groove portion extending from one end of the middle block to a center portion; A second middle horizontal groove portion which is equally inclined at intervals in the circumferential direction of the first middle horizontal groove portion and the tire and extends from the tile side end portion of the middle block to the center portion; And A heavy-load pneumatic tire having a tread pattern including a third middle lateral groove portion formed along a circumferential direction of the tire and connecting an end of the first middle lateral groove portion and the second middle block at the center of the middle block. In claim 1, The middle horizontal groove, A tread having a first sipe formed at a predetermined depth on a bottom surface of the third middle horizontal groove portion and a portion of a bottom surface of the first middle horizontal groove portion and the second middle horizontal groove portion adjacent to the third middle horizontal groove portion. Heavy-duty pneumatic tires with a pattern. In claim 2, A heavy-load pneumatic tire having a tread pattern further comprising a sipe metal plate inserted into and fixed to the first sipe. In claim 2, The heavy-duty heavy-duty pneumatic tire having a tread pattern in which the 1st extension part which the width | variety of the said 1st middle horizontal groove part and the said 2nd middle horizontal groove part extended is formed in the both ends of the middle longitudinal groove. In claim 4, The first expansion unit, A heavy-load pneumatic tire having a tread pattern formed by chamfering an acute corner portion of the unit middle blocks divided into a trapezoidal shape by the middle lateral groove. In claim 5, Both side wall surfaces of the center longitudinal groove and the middle longitudinal groove are formed to be inclined to have a narrow width toward the bottom surface, The center longitudinal groove and the bottom surface of the middle longitudinal groove is a heavy-duty pneumatic tire having a tread pattern is formed in the circumferential direction and the wave form in the width direction of the tire. In claim 6, A plurality of second sipes are formed at predetermined intervals along the circumferential direction of the tire at edges of the center block, the middle block, and the shoulder block facing each other with the middle longitudinal groove and the middle longitudinal groove interposed therebetween. Heavy-duty pneumatic tire with tread pattern to become. In claim 7, A plurality of center transverse grooves inclined along the width direction of the tire in the center block and extending in an oblique shape to partition the unit center blocks in a tire circumferential direction, The center horizontal groove, A first center horizontal groove portion extending from one end of the center block to the semi longitudinal groove portion; And A heavy-load pneumatic tire having a tread pattern including a second center lateral groove portion extending from the tile end of the middle block to the semi longitudinal groove at intervals in the circumferential direction of the first center lateral groove and the tire. In claim 8, A heavy-load pneumatic tire having a tread pattern including a second extension portion having a width extending from the first center horizontal groove portion and the second center horizontal groove portion at both ends of the center horizontal groove. The method of claim 9, The second expansion portion, A heavy-load pneumatic tire having a tread pattern having a tread pattern formed by chamfering the acute corners of the unit middle blocks divided into a trapezoidal shape by the center lateral groove. In claim 10, The distance G1 from the widthwise center of the tire to the center of the center longitudinal groove is A heavy-load pneumatic tire having a tread pattern comprising 0.01 TAW? GP1? 0.25 TAW. In claim 11, The distance G2 from the widthwise center of the tire to the center of the middle longitudinal groove is A heavy duty pneumatic tire having a tread pattern comprising 0.16 TAW &lt; GP2 &lt; 0.45 TAW. The method of claim 12, The width GW1 of the center longitudinal groove and the width GW2 of the middle longitudinal groove are A heavy-duty pneumatic tire having a tread pattern comprising 0.026 TAW = GW1, GW2 = 0.082 TAW. The method of claim 13, The depth A of the center longitudinal groove and the depth D of the middle longitudinal groove are A heavy duty pneumatic tire having a tread pattern that includes 0.5 GW1 = A, D = 1.5 GW. The method of claim 14, Both side walls of the center longitudinal groove and the middle longitudinal groove are rounded and formed to be inclined, The radius of curvature (R1, R2) of the both side wall of the center longitudinal groove and the middle longitudinal groove, A heavy duty pneumatic tire having a tread pattern comprising 20 mm = R1, R2 = 200 mm. 16. The method of claim 15, The bottom surface of the center longitudinal groove and the middle longitudinal groove is formed concave round, The radius of curvature R3 of the bottom surface, A heavy duty pneumatic tire having a tread pattern that includes 0.2 mm = R3 = 10 mm. In claim 14 The middle lateral groove width C3 is A heavy duty pneumatic tire having a tread pattern comprising 0.01 GW1 = C3 = 0.7 GW1. In paragraph 17 The depth B3 of the middle horizontal groove is A heavy duty pneumatic tire having a tread pattern comprising 0.01 A = B3 = 1.5 A. In paragraph 18 The bottom surface of the middle lateral groove is formed concave round, The curvature R5 of the middle horizontal groove bottom surface is A heavy duty pneumatic tire having a tread pattern that includes 0.2 mm = R5 = 10 mm. In claim 14 The width C2 of the semi-long groove is A heavy-load pneumatic tire having a tread pattern comprising 0.01 GW1 = C2 '= 0.7 GW1. In paragraph 20 The depth B2 of the semi-long groove is A heavy duty pneumatic tire having a tread pattern comprising 0.01 A = B2 = 1.5 A. From Article 21 The bottom surface of the semi longitudinal groove is formed concave round, Bottom curvature R4 of the semi-long groove is A heavy duty pneumatic tire having a tread pattern that includes 0.2 mm = R4 = 10 mm. In claim 14 The center lateral groove width C4 is A heavy-load pneumatic tire having a tread pattern comprising 0.01 GW1 = C4 '= 0.7 GW1. In paragraph 23 The depth B4 of the center horizontal groove is A heavy duty pneumatic tire having a tread pattern comprising 0.01 A = B4 = 1.5 A. In paragraph 24 The bottom surface of the center horizontal groove is formed concave round, The curvature R6 of the middle horizontal groove bottom surface is A heavy duty pneumatic tire having a tread pattern that includes 0.2 mm = R6 = 10 mm.

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