Pneumatic tire

Abstract

A pneumatic tire is disclosed. The pneumatic tire according to the present embodiment comprises: a tread to come into contact with a road surface; a carcass provided inside the tread; and a belt part provided at a tread side from the carcass, wherein the tread includes an inside shoulder block, an inside middle block, a center block, an outside middle block and an outside shoulder block, which are divided by means of main grooves formed in the circumferential direction and arranged to be spaced apart in the width direction, so as to be formed sequentially from the inner side to the outer side thereof with respect to the width direction, and a contact patch of the outside middle block can be provided to be larger than a contact patch of the inside middle block.

Description

air tires

[0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire that can improve controllability such as cornering and handling, as well as braking and driving performance on icy surfaces, while simultaneously preventing uneven wear of the tread and reduced durability.

[0002] Generally, the tread pattern of pneumatic tires is designed by comprehensively considering driving stability, steering responsiveness, noise performance, wear resistance, and drainage performance. In particular, passenger cars and SUVs require sufficient grip and stable control during steering as well as straight-line driving. To this end, asymmetric patterns that assign different functions to the inner and outer parts of the tread have been widely applied.

[0003] However, in conventional asymmetric pattern structures, the ratio of the contact area between the inner and outer sides of the tread was often not sufficiently optimized, or the block structure designed to increase the contact area of ​​the outer side was limited to simple expansion or enlargement. In such structures, problems arose where the outer side failed to adequately support cornering loads, leading to reduced handling responsiveness, or conversely, where the stiffness of the outer side increased excessively, causing pattern noise and irregular wear. Furthermore, there were limitations in overall performance improvement, such as localized durability degradation of the outer side of the tread due to uneven contact pressure distribution.

[0004] Meanwhile, as the tread repeatedly collides with the road surface and receives impact, the blocks are deformed. In conventional technology, there was a problem where the block rigidity was easily reduced because the shape of the block ends or the cuff structure were not sufficiently designed. In particular, when the transverse grooves or block ends were formed in a right angle or a sharp step shape, the impact from the road surface was concentrated, causing the blocks to twist or move. This resulted in problems such as reduced traction performance or increased pattern noise during high-speed driving.

[0005] Furthermore, the conventional structure of inside and outside middle blocks made it difficult to secure the additional stiffness and grip stability required during cornering. Additionally, the insufficient application of curved cuffs or bend designs capable of minimizing block deformation limited the ability to simultaneously satisfy maneuverability, durability, and noise performance. In particular, issues persisted where interference or fluid flow between blocks caused uneven overall tread stiffness, leading to accelerated abnormal wear during prolonged use.

[0006] The present embodiment aims to provide an air-filled tire that improves controllability, such as cornering or handling, by forming a larger contact area on the outer side of the tread compared to the contact area on the inner side of the tread, and prevents uneven wear of the tread and reduced durability.

[0007] The present embodiment aims to provide an air-filled tire that can prevent the reduction in stiffness and flow of the tread block caused by road surface impact applied to the tread side due to the tread pattern shape, and improve traction performance.

[0008] According to one embodiment of the present invention, an air-filled tire may be provided, comprising a tread in contact with a road surface, a carcass provided inside the tread, and a belt portion provided from the carcass to the tread side, wherein the tread is formed along the circumferential direction and is partitioned by main grooves spaced apart in the width direction, and includes an inside shoulder block, an inside middle block, a center block, an outside middle block, and an outside shoulder block formed sequentially from the inside to the outside in the width direction, and wherein the contact area of ​​the outside middle block is formed to be larger than the contact area of ​​the inside middle block.

[0009] The inside middle block comprises an inside middle block transverse groove formed to be inclined at a predetermined angle from the inner end of the inside middle block to the outer end of the inside middle block in the width direction and arranged at predetermined intervals in the circumferential direction, an inside middle block first cuff formed to be inclined at a predetermined angle from the outer end of the inside middle block to be adjacent to the inner end of the inside middle block in the width direction and arranged at predetermined intervals in the circumferential direction of the tread, and an inside middle block second cuff formed to be inclined at a predetermined angle from the inner end of the inside middle block to be adjacent to the outer end of the inside middle block in the width direction and arranged at predetermined intervals in the circumferential direction of the tread, and the inside middle block transverse groove, the inside middle block first cuff, and the inside middle block second cuff may be arranged sequentially and continuously along the circumferential direction.

[0010] The inside middle block transverse groove is divided into a first section provided on the inner end side of the inside middle block transverse groove, a second section provided on the outer end side of the inside middle block transverse groove, and a third section provided between the first section and the second section, and the width of the inside middle block transverse groove in the circumferential direction can be provided to gradually decrease from the first section and the second section toward the third section, respectively.

[0011] The inside middle block transverse groove may include a first chamfer portion disposed in the first section, formed such that the cross-sectional area gradually decreases from the inner end of the inside middle block transverse groove toward the outer end, a second chamfer portion disposed in the second section, formed such that the cross-sectional area gradually decreases from the outer end of the inside middle block transverse groove toward the inner end, and a third chamfer portion disposed in the third section, formed between the first chamfer portion and the second chamfer portion.

[0012] The first chamfer, the second chamfer, and the third chamfer may be formed to have the same height with respect to the depth direction.

[0013] The above-mentioned inside middle block first cuff may be provided in an arc shape with a curved portion formed in the circumferential direction.

[0014] The second cuff of the inside middle block above may be provided in an arc shape with a curved portion formed in the opposite direction to the first cuff of the inside middle block above.

[0015] The above outside middle block may include outside middle block transverse grooves that are formed to be inclined at a predetermined angle from the inner end of the outside middle block to the outer end of the outside middle block with respect to the width direction and are spaced apart at predetermined intervals with respect to the circumferential direction.

[0016] The outside middle block further includes an outside middle block first cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to adjacent to the outer end of the outside middle block with respect to the width direction, and spaced apart at a predetermined interval with respect to the circumferential direction, and the outside middle block transverse groove and the outside middle block first cuff may be sequentially and continuously arranged along the circumferential direction.

[0017] The outside middle block further includes an outside middle block second cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to the outer end of the outside middle block with respect to the width direction and spaced apart at a predetermined interval with respect to the circumferential direction, and the outside middle block transverse groove and the outside middle block second cuff may be sequentially and continuously arranged along the circumferential direction.

[0018] The outside middle block further includes an outside middle block first cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to adjacent to the outer end of the outside middle block in the width direction and spaced apart at a predetermined interval in the circumferential direction, and an outside middle block second cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to the outer end of the outside middle block in the width direction and spaced apart at a predetermined interval in the circumferential direction, and the outside middle block transverse groove, the outside middle block first cuff, and the outside middle block second cuff can be sequentially and continuously arranged along the circumferential direction.

[0019] With respect to the circumferential direction, the spacing between the outside middle block transverse groove, the outside middle block first cuff, and the outside middle block second cuff can be formed to be larger than the spacing between the inside middle block transverse groove, the inside middle block first cuff, and the inside middle block second cuff with respect to the circumferential direction.

[0020] The above-mentioned outside middle block first cuff may be provided in an arc shape with a curved portion formed in the circumferential direction.

[0021] The above outside middle block second cuff may be provided in an arc shape with a curved portion formed in the same direction as the above inside middle block second cuff.

[0022] The above outside middle block can be formed to have the same width as the above inside middle block.

[0023] The air-filled tire according to the present embodiment forms a larger contact area on the outer side of the tread compared to the contact area on the inner side of the tread, thereby improving controllability such as cornering and handling, and preventing uneven wear of the tread and reduced durability, which can further improve the marketability of the tire.

[0024] The pneumatic tire according to the present embodiment can prevent the reduction in stiffness and flow of the tread blocks caused by road surface impact applied to the tread side due to the tread pattern shape, and can improve traction performance, thereby greatly improving the marketability of the tire.

[0025] FIG. 1 is a cross-sectional view illustrating the overall shape of an air-filled tire according to one embodiment of the present invention.

[0026] FIG. 2 is a front view illustrating the tread of an air-filled tire according to one embodiment of the present invention.

[0027] FIG. 3 is a front view illustrating the tread of an air-filled tire according to another embodiment of the present invention.

[0028] FIG. 4 is a front view illustrating the tread of an air-filled tire according to another embodiment of the present invention.

[0029] FIG. 5 is a front view illustrating an inside middle block of an air-filled tire according to one embodiment of the present invention.

[0030] Figure 6 is a cross-sectional view illustrating the AA' section of Figure 5.

[0031] Figure 7 is a cross-sectional view illustrating the BB' section of Figure 5.

[0032] Figure 8 is a cross-sectional view showing the CC' section of Figure 5.

[0033] Figure 9 is a cross-sectional view showing the DD' section of Figure 5.

[0034] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. The following embodiments are presented to sufficiently convey the concept of the present invention to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments presented herein and may be embodied in other forms. In order to clarify the present invention, the drawings may omit the illustration of parts unrelated to the description and may slightly exaggerate the size of components to aid understanding.

[0035] FIG. 1 is a cross-sectional view illustrating the overall shape of an air-filled tire according to an embodiment of the present invention. FIG. 2 to 4 are front views illustrating the tread of an air-filled tire according to an embodiment of the present invention. FIG. 5 is a front view illustrating the inside middle block of an air-filled tire according to an embodiment of the present invention. FIG. 6 to 9 are cross-sectional views illustrating the AA', BB', CC', and DD' sections of FIG. 5, respectively.

[0036] Referring to FIGS. 1 to 9, the pneumatic tire according to the present invention may include a tread (100) in contact with the road surface, a carcass (200) provided inside the tread (100), and a belt section (300) provided with a plurality of belt layers stacked from the carcass (200) toward the tread (100).

[0037] The tread (100) forms the surface where the tire contacts the road surface and provides traction for the vehicle. To this end, the tread (100) can be provided in various shapes and materials so that sufficient traction of the tire can be achieved depending on the road conditions. For example, the tread (100) can be provided as a thick rubber layer and can be made of rubber that is resistant to cuts and impacts to protect the carcass (200) and the belt portion (300), and has strong wear resistance to extend the driving life of the tire.

[0038] More specifically, the tread (100) may include a first main groove (101), a second main groove (102), a third main groove (103), and a fourth main groove (104) that are formed extending along the circumferential direction (D1) of the tread (100). Here, the first main groove (101), the second main groove (102), the third main groove (103), and the fourth main groove (104) may be arranged at predetermined intervals from the inner side to the outer side of the tread (100) with respect to the width direction (D2) of the tread (100).

[0039] Additionally, the tread (100) may include an inside shoulder block (140), an inside middle block (120), a center block (110), an outside middle block (130), and an outside shoulder block (150) that are partitioned from the inside to the outside of the tread (100) in the width direction (D2) of the tread (100) by a first main groove (101), a second main groove (102), a third main groove (103), and a fourth main groove (104) arranged from the inside to the outside of the tread (100) in the width direction (D2) of the tread (100) as described above.

[0040] That is, the tread (100) may include a center block (110) positioned at the center of the width direction (D2) of the tread (100), an inside middle block (120) and an inside shoulder block (140) sequentially arranged in the inner direction of the tread (100) from the center block (110), an outside middle block (130) and an outside shoulder block (150) sequentially arranged in the outer direction of the tread (100) from the center block (110). Here, the contact area of ​​the outside middle block (130) may be formed to be larger than the contact area of ​​the inside middle block (120). Additionally, the outside middle block (130) and the inside middle block (120) may be formed with the same width.

[0041] More specifically, the center block (110) may be positioned between the second main groove (102) and the third main groove (103) as shown in FIG. 2 and placed on the center side in the width direction (D2) of the tread (100). Additionally, the center block (110) may include grooves and cuffs of various shapes, although not shown.

[0042] The inside middle block (120) may be provided between the first main groove (101) and the second main groove (102) and positioned adjacent to the inside from the center of the width direction (D2) of the center block (110) and the tread (100). Additionally, the inside middle block (120) may include a plurality of inside middle block transverse grooves (121) that are formed to extend from the inner end of the inside middle block (120) to the outer end of the inside middle block (120) with respect to the width direction (D2) of the tread (100) and are spaced apart at predetermined intervals with respect to the circumferential direction (D1) of the tread (100).

[0043] As shown in FIG. 5, the inside middle block transverse groove (121) can be formed by being inclined at a predetermined angle so that the inner end of the inside middle block (120) is positioned higher than the outer end of the inside middle block (120) with respect to the circumferential direction (D1) of the tread (100), and can be provided in an arc shape with a curved portion formed on the circumferential direction (D1) side of the tread (100).

[0044] Additionally, the inside middle block transverse groove (121) may be divided into a first section (S1) provided on the inner end side of the inside middle block transverse groove (121), a second section (S2) provided on the outer end side of the inside middle block transverse groove (121), and a third section (S3) provided between the first section (S1) and the second section (S2). Here, the width of the inside middle block transverse groove (121) with respect to the circumferential direction (D1) of the tread (100) may be provided to gradually decrease from the first section (S1) and the second section (S2) toward the third section (S3), respectively.

[0045] Additionally, the inside middle block transverse groove (121) may include a first chamfer section (121a) positioned in the first section (S1) formed such that the cross-sectional area gradually decreases from the inner end of the inside middle block transverse groove (121) toward the outer end, a second chamfer section (121b) positioned in the second section (S2) formed such that the cross-sectional area gradually decreases from the outer end of the inside middle block transverse groove (121) toward the inner end, and a third chamfer section (121c) formed between the first chamfer section (121a) and the second chamfer section (121b) and positioned in the third section (S3).

[0046] These first chamfer section (121a), second chamfer section (121b), and third chamfer section (121c) may each be formed in a divided manner along the circumferential direction (D1) of the tread (100), as shown in FIGS. 6 to 9. Additionally, the first chamfer section (121a), second chamfer section (121b), and third chamfer section (121c) may be formed to have the same height along the depth direction (D3) of the tread (100).

[0047] The inside middle block (120) may include a plurality of inside middle block first cuffs (122) that are formed to extend from the outer end of the inside middle block (120) to adjacent to the inner end of the inside middle block (120) with respect to the width direction (D2) of the tread (100) and are spaced apart at a predetermined interval with respect to the circumferential direction (D1) of the tread (100). Here, as shown in FIG. 5, the inside middle block first cuffs (122) may be formed at a predetermined angle such that the inner end of the inside middle block (120) is positioned above the outer end of the inside middle block (120) with respect to the circumferential direction (D1) of the tread (100), and may be provided in an arc shape with a curved portion formed on the opposite side of the circumferential direction (D1) of the tread (100).

[0048] The inside middle block (120) may include a plurality of inside middle block second cuffs (123) that are formed to extend from the inner end of the inside middle block (120) to adjacent to the outer end of the inside middle block (120) with respect to the width direction (D2) of the tread (100) and are spaced apart at a predetermined interval with respect to the circumferential direction (D1) of the tread (100). Here, as shown in FIG. 2, the inside middle block second cuffs (123) may be formed by being inclined at a predetermined angle so that the inner end of the inside middle block (120) is positioned above the outer end of the inside middle block (120) with respect to the circumferential direction (D1) of the tread (100), and may be provided in an arc shape with a curved portion formed on the circumferential direction (D1) side of the tread (100).

[0049] Additionally, the inside middle block (120) may be provided such that the inside middle block transverse groove (121), the inside middle block first cuff (122), and the inside middle block second cuff (123), which are provided as described above, are sequentially arranged in a continuous manner along the circumferential direction (D1) of the tread (100).

[0050] The outside middle block (130) may be provided between the third main groove (103) and the fourth main groove (104) and positioned adjacently to the outside from the center of the width direction (D2) of the center block (110) and the tread (100). Additionally, the outside middle block (130) may include a plurality of outside middle block transverse grooves (131) that are formed to extend from the inner end of the outside middle block (130) to the outer end of the outside middle block (130) with respect to the width direction (D2) of the tread (100) and are spaced apart at predetermined intervals with respect to the circumferential direction (D1) of the tread (100).

[0051] Additionally, the width of the outside middle block (130) can be formed to be the same as the width of the inside middle block (120). Also, the width of the outside middle block (130) and the width of the inside middle block (120) can be formed to be greater than the width of the center block (110) and smaller than the width of the inside shoulder block (140) and the outside shoulder block (150), respectively.

[0052] As shown in FIG. 2, the outside middle block transverse groove (131) may be formed at a predetermined angle such that the inner end of the outside middle block (130) is positioned above the outer end of the outside middle block (130) with respect to the circumferential direction (D1) of the tread (100). Additionally, the outside middle block transverse groove (131) may include chamfered portions provided on both ends. Here, the chamfered portions are intended to improve the drainage performance of the tread (100) and may be formed such that the area gradually increases toward both ends relative to the center of the width direction of the outside middle block (130), and may be provided in an arc shape with a curved portion formed on the opposite side of the circumferential direction (D1) of the tread (100).

[0053] Additionally, the area of ​​the outside middle block transverse groove (131) can be formed to be smaller than the area of ​​the inside middle block transverse groove (121). Accordingly, when the inside middle block transverse groove (121) and the outside middle block transverse groove (131) are arranged at equal intervals with respect to the circumferential direction (D1) of the tread (100) in the inside middle block (120) and the outside middle block (130), respectively, the contact area of ​​the outside middle block (130) can be formed to be larger than the contact area of ​​the inside middle block (120).

[0054] The outside middle block (130) may include a plurality of outside middle block first cuffs (132) that are formed to extend from the inner end of the outside middle block (130) to adjacent to the outer end of the outside middle block (130) with respect to the width direction (D2) of the tread (100) and are spaced apart at a predetermined interval with respect to the circumferential direction (D1) of the tread (100). Here, the outside middle block first cuffs (132) may be formed at a predetermined angle such that the inner end of the outside middle block (130) is positioned above the outer end of the outside middle block (130) with respect to the circumferential direction (D1) of the tread (100), and may be provided in an arc shape with a curved portion formed on the opposite side of the circumferential direction (D1) of the tread (100).

[0055] The outside middle block (130) may include a plurality of outside middle block second cuffs (133) that are formed to extend from the inner end of the outside middle block (130) to the outer end of the outside middle block (130) with respect to the width direction (D2) of the tread (100) and are spaced apart at a predetermined interval with respect to the circumferential direction (D1) of the tread (100). Here, the outside middle block second cuffs (133) may be formed by being inclined at a predetermined angle so that the inner end of the outside middle block (130) is positioned above the outer end of the outside middle block (130) with respect to the circumferential direction (D1) of the tread (100), and may be provided in an arc shape with a curved portion formed on the opposite side of the circumferential direction (D1) of the tread (100).

[0056] Additionally, the outside middle block (130), the outside middle block transverse groove (131), the outside middle block first cuff (132), and the outside middle block second cuff (133) can be sequentially arranged in a continuous manner along the circumferential direction (D1) of the tread (100). At this time, the arrangement spacing between the outside middle block transverse groove (131), the outside middle block first cuff (132), and the outside middle block second cuff (133) with respect to the circumferential direction (D1) of the tread (100) can be formed to be larger than the arrangement spacing between the inside middle block transverse groove (121), the inside middle block first cuff (122), and the inside middle block second cuff (123) with respect to the circumferential direction (D1) of the tread (100).

[0057] Accordingly, the total number of inside middle block transverse grooves (121), inside middle block first cuffs (122), and inside middle block second cuffs (123) arranged within the setting area of ​​the inside middle block (120) which is set to have the same length with respect to the circumferential direction (D1) of the tread (100) is formed to be greater than the total number of outside middle block transverse grooves (131), outside middle block first cuffs (132), and outside middle block second cuffs (133) arranged within the setting area of ​​the outside middle block (130), so that the contact area of ​​the outside middle block (130) can be formed to be larger than the contact area of ​​the inside middle block (120).

[0058] Additionally, the outside middle block (130) may be provided with only the outside middle block first cuff (132) placed between the outside middle block transverse grooves (131) excluding the outside middle block second cuff (133), as shown in FIG. 3, or with only the outside middle block second cuff (133) placed excluding the outside middle block first cuff (132), as shown in FIG. 4.

[0059] Additionally, the outside middle block (130) may be provided with alternating patterns such as a type in which both the outside middle block first cuff (132) and the outside middle block second cuff (133) are arranged between the outside middle block transverse grooves (131) as shown in FIG. 2, and a type in which only one of the outside middle block first cuff (132) or the outside middle block second cuff (133) is arranged between the outside middle block transverse grooves (131) as shown in FIG. 3 and FIG. 4.

[0060] Accordingly, in an embodiment of the present invention, even when the spacing of the outside middle block transverse grooves (131) and the spacing of the inside middle block transverse grooves (121) are formed equally with respect to the circumferential direction (D1) of the tread (100), the total number of inside middle block transverse grooves (121), inside middle block first cuffs (122), and inside middle block second cuffs (123) arranged within the set area of ​​the inside middle block (120), which is set to have the same length with respect to the circumferential direction (D1) of the tread (100), is formed to be greater than the total number of outside middle block transverse grooves (131) and outside middle block first cuffs (132) or / and outside middle block second cuffs (133) arranged within the set area of ​​the outside middle block (130), so that the contact area of ​​the outside middle block (130) It can be formed larger than the ground area of ​​the inside middle block (120).

[0061] The inside shoulder block (140) can be positioned inwardly from the first main groove (101) in the width direction (D2) of the tread (100). Additionally, the inside shoulder block (140) may include grooves and cuffs of various shapes, although not illustrated.

[0062] The outside shoulder block (150) may be positioned outward from the fourth main groove (104) in the width direction (D2) of the tread (100). Additionally, the outside shoulder block (140) may include grooves and cuffs of various shapes, although not illustrated.

[0063] The carcass (200) is a cord layer forming the skeleton of the tire and is arranged to extend from the inside of the tread (100) to both sides based on the center in the width direction (D2) of the tread (100), passing through the sidewall (210) to reach the bead (220), supporting the air pressure inside the tire and the load of the entire vehicle, and can be deformed according to road surface impact while the vehicle is driving.

[0064] More specifically, the carcass (200) is positioned inside the tire to form the basic shape of the tire and support the load of the vehicle. To this end, the carcass (200) may include multiple layers made of steel cords with excellent rigidity. Additionally, although not illustrated, the carcass (200) may include an inner liner layer provided on the radially inner side of the carcass (200) to protect the internal space of the tire from air and moisture. Furthermore, the carcass (200) may be provided such that the sidewall (210) and the bead (220) are symmetrically positioned on both sides with respect to the center of the tread (100) to prevent the steering stability from being reduced by ply steer.

[0065] The sidewall (210) is provided between the tread (100) and the bead (220) to protect the carcass (200) and improve ride comfort through flexible bending motion. To this end, the sidewall (210) can be provided in various shapes and materials to have sufficient flexibility. In addition, various information such as the type of tire, size structure, pattern, manufacturer, and brand name can be displayed on the sidewall (210).

[0066] A bead (220) is positioned on the inner surface of the tire and adheres to the rim to secure the tire to the wheel of the vehicle. To this end, the bead (220) may be provided in various shapes and materials, including a bead wire (not shown) and a bead core (not shown), so that the tire can be securely fixed to the rim. Additionally, this bead (220) may be provided to provide a slight tightening to the rim so that the tire does not come off the rim even if the air pressure of the tire decreases rapidly while driving.

[0067] The belt section (300) is positioned radially outward from the carcass (200) inside the tread (100) to increase the strength of the tread (100) and protect the carcass (200) by preventing impacts received from the tread (100) and cracks occurring in the tread (100) from being transmitted to the carcass (200). To this end, the belt section (300) may be provided by stacking multiple belt layers. Additionally, the belt layers constituting the belt section (300) may each be provided as a metal cord or may be provided by combining a metal cord and a synthetic resin cord.

[0068] Although specific embodiments of the air-filled tire according to the present invention have been described so far, it is obvious that various modifications are possible within the scope of the present invention.

[0069] Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

[0070] That is, the aforementioned embodiments should be understood as exemplary in all respects and not limiting, and the scope of the invention is defined by the claims set forth below rather than by the detailed description, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the invention.

Claims

1. Tread in contact with the road surface; A carcass provided inside the above-mentioned tread; and A belt portion provided on the tread side from the carcass; comprising The above tread It includes an inside shoulder block, an inside middle block, a center block, an outside middle block, and an outside shoulder block, which are formed sequentially from the inside to the outside in the width direction and partitioned by main grooves formed along the circumferential direction and spaced apart in the width direction. The grounding area of ​​the above outside middle block is An air-filled tire formed with a contact area larger than that of the inside middle block.

2. In Paragraph 1, The above inside middle block is Inside middle block transverse grooves formed to be inclined at a predetermined angle from the inner end of the inside middle block to the outer end of the inside middle block with respect to the width direction and arranged at predetermined intervals with respect to the circumferential direction, An inside middle block first cuff formed to be inclined at a predetermined angle from the outer end of the inside middle block to be adjacent to the inner end of the inside middle block with respect to the width direction, and arranged at a predetermined interval with respect to the circumferential direction of the tread, It includes an inside middle block second cuff formed to be inclined at a predetermined angle from the inner end of the inside middle block to adjacent to the outer end of the inside middle block with respect to the width direction, and arranged at a predetermined interval with respect to the circumferential direction of the tread. The above inside middle block transverse groove, the above inside middle block first cuff, and the above inside middle block second cuff are air-filled tires that are sequentially and continuously arranged along the circumferential direction.

3. In Paragraph 2, The above inside middle block transverse groove is A first section provided on the inner end side of the above-mentioned inside middle block transverse groove, and A second section provided on the outer end side of the above-mentioned inside middle block transverse groove, and It is divided into a third section provided between the first section and the second section, and The width of the above inside middle block transverse groove in the circumferential direction is An air-filled tire arranged to gradually decrease in size from the first section and the second section, respectively, toward the third section.

4. In Paragraph 3, The above inside middle block transverse groove is A first chamfer portion disposed in the first section, formed such that the cross-sectional area gradually decreases from the inner end of the inside middle block transverse groove toward the outer side, and A second chamfer portion disposed in the second section, formed such that the cross-sectional area gradually decreases from the outer end of the inside middle block transverse groove toward the inside, and An air-filled tire comprising a third chamfer formed between the first chamfer and the second chamfer and positioned in the third section.

5. In Paragraph 4, The first chamfer section, the second chamfer section, and the third chamfer section Air-filled tires formed to have equal heights in the depth direction.

6. In Paragraph 2, The above inside middle block first cuff is An air-filled tire formed in an arc shape with a curved section formed in the circumferential direction.

7. In Paragraph 6, The above inside middle block second cuff is An air-filled tire provided in an arc shape with a curved portion formed in the opposite direction to the inside middle block first cuff.

8. In Paragraph 2, The above outside middle block is An air-filled tire comprising outside middle block transverse grooves formed to be inclined at a predetermined angle from the inner end of the outside middle block to the outer end of the outside middle block with respect to the width direction and spaced apart at a predetermined interval with respect to the circumferential direction.

9. In Paragraph 8, The above outside middle block is It further includes an outside middle block first cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to adjacent to the outer end of the outside middle block with respect to the width direction, and spaced apart at a predetermined interval with respect to the circumferential direction. The above outside middle block transverse groove and the above outside middle block first cuff are air-filled tires that are sequentially and continuously arranged along the circumferential direction.

10. In Paragraph 8, The above outside middle block is It further includes an outside middle block second cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to the outer end of the outside middle block with respect to the width direction, and spaced apart at a predetermined interval with respect to the circumferential direction. The above outside middle block transverse groove and the above outside middle block second cuff are air-filled tires that are sequentially and continuously arranged along the circumferential direction.

11. In Paragraph 8, The above outside middle block is An outside middle block first cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to adjacent to the outer end of the outside middle block with respect to the width direction, and spaced apart at a predetermined interval with respect to the circumferential direction, It further includes an outside middle block second cuff formed to be inclined at a predetermined angle from the inner end of the outside middle block to the outer end of the outside middle block with respect to the width direction, and spaced apart at a predetermined interval with respect to the circumferential direction. The above outside middle block transverse groove, the above outside middle block first cuff, and the above outside middle block second cuff are air-filled tires that are sequentially and continuously arranged along the circumferential direction.

12. In Paragraph 11, With respect to the circumferential direction, the arrangement spacing between the outside middle block transverse groove, the outside middle block first cuff, and the outside middle block second cuff is An air-filled tire formed with a spacing greater than the spacing between the inside middle block transverse groove, the inside middle block first cuff, and the inside middle block second cuff with respect to the circumferential direction.

13. In Paragraph 11, The above outside middle block first cuff is An air-filled tire formed in an arc shape with a curved section formed in the circumferential direction.

14. In Paragraph 13, The above outside middle block second cuff is An air-filled tire provided in an arc shape with a curved portion formed in the same direction as the inside middle block second cuff.

15. In Paragraph 1, The above outside middle block is An air-filled tire formed to have the same width as the inside middle block above.

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