A centrosymmetrical tire tread structure for noise reduction

Abstract

The present invention relates to the technical field of tire tread design, disclosing a centrosymmetrical tire tread structure for noise reduction. The tire tread structure comprises five alternating tread blocks and four tread grooves arranged transversely along the tire tread. The tread blocks are provided with a number of independent shallow grooves or parallel, closely spaced shallow grooves, all interconnected with the tread grooves. The shallow grooves are only 1-2 mm wide and 1 mm deep. This design prevents air from being trapped when the tread contacts the ground, reducing the number of closed grooves when the tread blocks touch the ground, thereby reducing resonance and noise. Furthermore, the wavy structure formed by the parallel, closely spaced shallow grooves enhances drainage and effectively breaks up the water film on wet or flooded roads, resulting in excellent tire-road grip and ensuring safe driving.

Description

Technical Field

[0001] The present invention relates to the technical field of tire pattern design, in particular to a noise-reducing centrosymmetrical tire pattern structure. Background Art

[0002] Tire tread pattern is also called tread pattern. It is molded or engraved on the outer tread, and its main function is to improve the driving performance of the tire while also enhancing its appearance. The main types are: road pattern suitable for driving on paved roads, also known as ordinary pattern; off-road pattern suitable for driving under unpaved conditions, also known as off-road tread pattern, whose pattern block area accounts for a large proportion of the total crown area; the middle part of the tread driving surface is a road pattern, and the two sides are off-road patterns, which is called a mixed pattern, also known as a universal pattern or a universal pattern, and its pattern contact area accounts for about 65% of the total driving surface area; the pattern with driving direction requirements is called a directional pattern, and its pattern is in the shape of a herringbone or oblique stripes, suitable for Used in tires for construction machinery and agricultural tractors, it can provide good traction and self-cleaning properties. When installing tires with this pattern, the apex of the herringbone or oblique strips must be consistent with the direction of travel, and the direction of travel must be marked with an arrow on the sidewall. If mud is used in the opposite direction, the grooves will be filled and traction performance will be lost. The snow and mud pattern suitable for driving on muddy and icy roads is also called the winter tread pattern. This is a block pattern with sharp edges. This pattern has good anti-slip properties and can ensure the safe driving of the tire on icy, snowy and muddy roads.

[0003] Tire treads require different models based on specific needs, but they are the most complex and challenging to design. Many factors must be considered: favoring grip can lead to louder noise, while favoring drainage can hinder high-speed tire rotation. In other words, favoring one specific performance factor can significantly compromise other performance factors.

[0004] A Chinese invention patent (publication number: CN219969314U; publication date: November 7, 2023) discloses a tread pattern structure for an all-steel, load-bearing, tubeless radial tire. The tire body comprises a wheel disc and a tread. The tread is constructed from a nine-part flexible mold. The tread is evenly distributed with primary grooves and primary blocks. The primary grooves comprise two central grooves and two side grooves, while the primary blocks comprise one central block and two side blocks, forming a tread structure. Rectangular secondary blocks are evenly spaced longitudinally above the central and side blocks, with their long edges running longitudinally and internally provided with diagonal secondary block grooves. However, the secondary blocks are densely distributed toward the center, and the shoulder blocks lack grooves, indicating a lack of emphasis on water drainage and noise reduction. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a centrosymmetrical tire tread structure for noise reduction.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A centrosymmetrical tire pattern structure for noise reduction, comprising five alternating tread blocks and four tread grooves arranged transversely along the tire tread, wherein the five tread blocks comprise, from left to right, a first tread block, a second tread block, a third tread block, a fourth tread block, and a fifth tread block, and the four tread grooves comprise, from left to right, a first tread groove, a second tread groove, a third tread groove, and a fourth tread groove;

[0008] The first and fifth pattern blocks are shoulder pattern blocks. The first pattern block is provided with a plurality of first profiles spaced apart circumferentially. The first profile extends from the first pattern groove toward the interior of the first pattern block and is in the shape of an inclined figure seven. A first shallow groove is provided on the inner circle of the first profile. The first shallow groove includes a first inclined groove and a curved groove. One end of the first inclined groove terminates inside the first pattern block and the other end is connected to the first pattern groove. The curved groove includes a longitudinal groove and a second inclined groove. The longitudinal groove intersects with the first inclined groove. One end of the second inclined groove is connected to the longitudinal groove and the other end is connected to the first pattern groove.

[0009] The pattern on the fifth pattern block is centrally symmetrical to the pattern on the first pattern block;

[0010] The second and fourth pattern blocks are intermediate pattern blocks. The second pattern block is provided with a plurality of second and third profiles spaced apart in a circumferential direction. The second profile extends from the second pattern groove to the interior of the second pattern block, and the third profile extends from the first pattern groove to the interior of the second pattern block. The second profile and the third profile have the same shape and size, and are both parallelograms. The second profile and the third profile are arranged adjacent to each other. A second shallow groove is provided around the outer circle of the second profile, and a third shallow groove is provided around the outer circle of the third profile.

[0011] The second shallow groove includes a first end, a second end, a third end, and a fourth end connected in sequence, the first end being a starting end connected to the second pattern groove, the second end and the third end being located inside the second pattern block, the fourth end being a terminating end connected to the second groove, the shallow groove connecting the third end and the fourth end extending toward the first groove to form a first secondary shallow groove, and the first secondary shallow groove being connected to the first groove;

[0012] The third shallow groove includes a first end, a second end, a third end, and a fourth end connected in sequence, wherein the first end is a starting end connected to the first pattern groove, the second end and the third end are located inside the second pattern block, and the fourth end is a terminating end connected to the first groove. A second auxiliary shallow groove is provided in the shallow groove connecting the third end and the fourth end toward the second groove, and the second auxiliary shallow groove is connected to the second groove.

[0013] A third auxiliary shallow groove is provided circumferentially between the second shallow groove and the third shallow groove, the third auxiliary shallow groove communicating with the shallow groove connecting the first end and the second end of the second shallow groove and the shallow groove connecting the first end and the second end of the third shallow groove; and a plurality of mutually parallel circumferentially arranged fourth shallow grooves are provided within the second contour and the third contour;

[0014] The pattern on the fourth pattern block is centrally symmetrical to the pattern on the second pattern block;

[0015] The third pattern block is a central pattern block, and is provided with a fourth profile and a fifth profile spaced apart in the circumferential direction of the third pattern block. The fourth profile is arranged adjacent to the fifth profile, and both the fourth profile and the fifth profile extend from the second pattern groove to the third pattern groove in an inclined "Z" shape. A fifth shallow groove and a sixth shallow groove are provided on the inner circumference of the fourth profile and the fifth profile, respectively. The ends of the fifth shallow groove and the sixth shallow groove are connected to the second groove and the third groove, respectively. The fifth shallow groove and the sixth shallow groove each include two inclined grooves and a longitudinal groove connected to the inclined groove.

[0016] The inclined groove connecting the fifth shallow groove and the second pattern groove is extended with a fourth secondary shallow groove, and the fourth secondary shallow groove connects the inclined groove of the fifth shallow groove and the third pattern groove; the inclined groove connecting the sixth shallow groove and the third groove is extended with a fifth secondary shallow groove, and the fifth secondary shallow groove connects the inclined groove of the sixth shallow groove and the second groove.

[0017] Preferably, the cross section of the first shallow groove, the second shallow groove, the third shallow groove, the fifth shallow groove, the sixth shallow groove, the first secondary shallow groove, the second secondary shallow groove, the third secondary shallow groove, the fourth secondary shallow groove or the fifth secondary shallow groove is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm;

[0018] The fourth shallow groove has a depth of 1 mm and a width of 2 mm.

[0019] Preferably, the first and fourth grooves are bilaterally symmetrical, and the groove bottoms are both rounded; the first groove is 18 mm deep and 13 mm wide, the left groove wall is inclined 18°50′ from the center, and the right groove wall is inclined 13°10′ from the center.

[0020] Preferably, the second and third grooves are bilaterally symmetrical, and the groove bottoms are both chamfered; the second groove is 18 mm deep, 12 mm wide, and 3 mm deep in the chamfer; the left groove wall is inclined 19° from the center, and the right groove wall is inclined 13° from the center; preferably, the radius of the circle containing the arc of the chamfer is 5 mm.

[0021] Furthermore, the present invention also discloses an all-steel tire, the tread pattern of which adopts the tire pattern structure.

[0022] The beneficial effects of this invention are as follows: The tread blocks are provided with a number of independent shallow grooves or parallel, densely packed shallow grooves, all of which are interconnected with the tread grooves. The shallow grooves are only 1-2 mm wide and 1 mm deep. This design prevents air from being trapped when the tread contacts the ground, reducing the number of closed grooves when the tread blocks touch the ground, thereby reducing resonance and noise. Furthermore, the wavy structure formed by the densely packed shallow grooves enhances drainage and effectively breaks up the water film on wet or flooded roads, allowing the tire to maintain excellent grip on the road and ensuring safe driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of tire pattern structure.

[0024] Figure 2 Schematic diagram of the GG cross section of the first shallow groove, the second shallow groove, the third shallow groove, the fifth shallow groove, the sixth shallow groove, the first auxiliary shallow groove, the second auxiliary shallow groove, the third auxiliary shallow groove, the fourth auxiliary shallow groove and the fifth auxiliary shallow groove.

[0025] Figure 3 Schematic diagram of the local AA section of the second and third contours.

[0026] Figure 4 Schematic cross-sectional views of the grooves, A: schematic cross-sectional view of the first groove DD, B: schematic cross-sectional view of the second groove CC, C: schematic cross-sectional view of the third groove EE, D: schematic cross-sectional view of the fourth groove FF.

[0027] Figure 5 Schematic diagram of the tire tread structure for the reference example. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] The following examples are combined Figure 1-Figure 4 illustrate.

[0031] like Figure 1 As shown, a noise-reducing centrally symmetrical tire pattern structure includes five alternating tread blocks and four tread grooves, which are arranged laterally along the tire tread. The five tread blocks include, from left to right, a first tread block 11, a second tread block 12, a third tread block 13, a fourth tread block 14, and a fifth tread block 15. The four tread grooves include, from left to right, a first tread groove 21, a second tread groove 22, a third tread groove 23, and a fourth tread groove 24.

[0032] The first pattern block 11 and the fifth pattern block 15 are shoulder pattern blocks. The first pattern block 11 is provided with a plurality of first profiles spaced apart in the circumferential direction. The first profile extends from the first pattern groove 21 to the inside of the first pattern block 11 and is in the shape of an inclined "seven". A first shallow groove 31 is provided in the inner circle of the first profile. The first shallow groove 31 includes a first inclined groove and a bending groove. One end of the first inclined groove ends inside the first pattern block 11 and the other end is connected to the first pattern groove 21. The bending groove includes a longitudinal groove and a second inclined groove. The longitudinal groove intersects with the first inclined groove. One end of the second inclined groove is connected to the longitudinal groove and the other end is connected to the first pattern groove 21. The cross section of the first shallow groove 31 is as follows Figure 2 As shown, the cross-section is a rounded rectangular shape with a groove depth of 1mm, a groove width of 2mm, and a corner radius of 0.5mm. This shoulder pattern design ensures low noise while increasing shoulder grip.

[0033] The pattern on the fifth block 15 and the pattern on the first block 11 are centrally symmetrical to each other.

[0034] The second pattern block 12 and the fourth pattern block 14 are intermediate pattern blocks. The second pattern block 12 is provided with a plurality of second profiles and third profiles arranged at intervals in the circumference thereof. The second profile extends from the second pattern groove 22 to the inside of the second pattern block 12, and the third profile extends from the first pattern groove 21 to the inside of the second pattern block 12. The second profile and the third profile have the same shape and size, and are both parallelograms. The second profile and the third profile are arranged adjacent to each other. A second shallow groove 32 is provided around the outer circle of the second profile, and a third shallow groove 33 is provided around the outer circle of the third profile. The cross-sections of the second shallow groove 32 and the third shallow groove 33 are shown in FIG. Figure 2 As shown, the cross section is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0035] The second shallow groove 32 includes a first end, a second end, a third end and a fourth end connected in sequence. The first end is a starting end connected to the second pattern groove 22. The second end and the third end are located inside the second pattern block 12. The fourth end is a terminal end connected to the second pattern groove 22. The shallow groove connecting the third end and the fourth end extends toward the first pattern groove 21 to form a first auxiliary shallow groove 41. The first auxiliary shallow groove 41 is connected to the first pattern groove 21. The cross section of the first auxiliary shallow groove 41 is as shown in FIG. Figure 2As shown, the cross section is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0036] The third shallow groove 33 includes a first end, a second end, a third end and a fourth end connected in sequence. The first end is a starting end connected to the first groove 21. The second end and the third end are located inside the second pattern block 12. The fourth end is a terminal end connected to the first groove 21. The shallow groove connecting the third end and the fourth end extends toward the second groove 22 to form a second auxiliary shallow groove 42. The second auxiliary shallow groove 42 is connected to the second groove 22. The cross section of the second auxiliary shallow groove 42 is as shown in FIG. Figure 2 As shown, the cross section is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0037] A circumferentially arranged third auxiliary shallow groove 43 is provided between the second shallow groove 32 and the third shallow groove 33. The third auxiliary shallow groove 43 connects the shallow groove connecting the first end and the second end of the second shallow groove 32 and the shallow groove connecting the first end and the second end of the third shallow groove 33. A plurality of mutually parallel circumferentially arranged fourth shallow grooves 34 are provided in the second contour and the third contour. The cross section of the third auxiliary shallow groove 43 is as follows: Figure 2 As shown, the cross section is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0038] like Figure 3 As shown, the fourth shallow grooves 34 have a depth of 1mm and a width of 1mm, with a 1mm gap between each pair. The partial cross-section within the second profile is wavy, with each wave forming a semicircle with a radius of 0.5mm. The pattern design within the second and third profiles prevents air from being trapped by the grooves when the tread contacts the ground, reducing the number of closed grooves during contact, thereby minimizing resonance and noise. Furthermore, the wavy structure effectively breaks up the water film on wet or flooded roads, allowing the tire to maintain contact with the road and generate excellent grip, ensuring safe driving.

[0039] The pattern on the fourth pattern block 14 and the pattern on the second pattern block 11 are centrally symmetrical to each other.

[0040] The third pattern block 13 is a central pattern block. The third pattern block 13 is provided with a fourth profile and a fifth profile arranged at intervals in the circumferential direction. The fourth profile is arranged adjacent to the fifth profile. Both the fourth profile and the fifth profile extend from the second pattern groove 22 to the third pattern groove 23 in an inclined "Z" shape. A fifth shallow groove 35 and a sixth shallow groove 36 are provided in the inner circle of the fourth profile and the fifth profile respectively. The ends of the fifth shallow groove 35 and the sixth shallow groove 36 are connected to the second pattern groove 22 and the third pattern groove 23 respectively. The fifth shallow groove 35 and the sixth shallow groove 36 both include two inclined grooves and a longitudinal groove connected to the inclined groove. The cross-section of the fifth shallow groove 35 and the sixth shallow groove 36 is as shown in FIG. Figure 2As shown, the cross section is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0041] The oblique groove connecting the fifth shallow groove 35 and the second tread groove 22 is extended to form a fourth auxiliary shallow groove 44, which connects the oblique groove of the fifth shallow groove 35 and the third groove 23; the oblique groove connecting the sixth shallow groove 36 and the third groove 23 is extended to form a fifth auxiliary shallow groove 45, which connects the oblique groove of the sixth shallow groove 36 and the second groove 22. The fourth auxiliary shallow groove 44 and the fifth auxiliary shallow groove 45 are as shown in FIG. Figure 2 As shown, the cross section is a rounded rectangle with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0042] like Figure 4 As shown, the first groove 21 and the fourth groove 24 are bilaterally symmetrical, and the groove bottoms are both rounded; Figure 4 As shown in (A), the first groove 21 has a depth of 18 mm and a width of 13 mm, with the left groove wall inclined 18°50′ from the center and the right groove wall inclined 13°10′ from the center; Figure 4 As shown in (D), the fourth groove 24 has a groove depth of 18 mm and a groove width of 13 mm, the left groove wall is inclined 13°10′ from the center, and the right groove wall is inclined 18°50′ from the center.

[0043] like Figure 4 As shown, the second groove 22 and the third groove 23 are bilaterally symmetrical, and the groove bottoms are both rounded; Figure 4 As shown in (B), the second groove 22 has a groove depth of 18 mm, a groove width of 12 mm, a fillet depth of 3 mm, a groove wall on the left side tilted 19° from the center, and a groove wall on the right side tilted 13° from the center; Figure 4 As shown in Figure (C), the third groove 23 has a depth of 18mm, a width of 12mm, and a 3mm rounded corner. The left groove wall is tilted 13° from the center, and the right groove wall is tilted 19° from the center. The radius of the circle tangent to the groove wall in the rounded corner is 5mm.

[0044] <Noise performance>

[0045] Based on the analysis of the sound generation mechanism of tire tread noise, a physical test model of tire tread noise suitable for computer simulation analysis was established. The tire noise simulation analysis was carried out at a speed of 80 km / h.

[0046] Test objects: tires described in the reference example and embodiment 1, the tires are of the same specifications, and the tire pattern used in the reference example is as follows Figure 5 shown.

[0047] The test results are shown in Table 1.

[0048] Table 1

[0049] Reference example Example 1 Tire tread saturation (%) 72.57 72.60 Noise (dB) 71 70

[0050] The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments will enable professionals in the field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centrosymmetrical tire pattern structure for noise reduction, the tire pattern structure comprising five alternately arranged pattern blocks and four pattern grooves, arranged transversely along the tire tread, the five pattern blocks comprising, from left to right, a first pattern block (11), a second pattern block (12), a third pattern block (13), a fourth pattern block (14) and a fifth pattern block (15), and the four pattern grooves comprising, from left to right, a first pattern groove (21), a second pattern groove (22), a third pattern groove (23) and a fourth pattern groove (24); characterized in that: The first tread block (11) and the fifth tread block (15) are shoulder tread blocks. The first tread block (11) is provided with a plurality of first profiles arranged at intervals in the circumferential direction. The first profile extends from the first tread groove (21) to the inside of the first tread block (11) and is in an inclined "seven" shape. A first shallow groove (31) is provided on the inner circle of the first profile. The first shallow groove (31) includes a first inclined groove and a bent groove. One end of the first inclined groove terminates inside the first tread block (11) and the other end is connected to the first tread groove (21). The bent groove includes a longitudinal groove and a second inclined groove. The longitudinal groove intersects with the first inclined groove. One end of the second inclined groove is connected to the longitudinal groove and the other end is connected to the first tread groove (21). The pattern on the fifth pattern block (15) and the pattern on the first pattern block (11) are centrally symmetrical to each other; The second pattern block (12) and the fourth pattern block (14) are intermediate pattern blocks. The second pattern block (12) is provided with a plurality of second profiles and third profiles arranged at intervals in the circumferential direction. The second profile extends from the second pattern groove (22) to the interior of the second pattern block (12). The third profile extends from the first pattern groove (21) to the interior of the second pattern block (12). The second profile and the third profile have the same shape and size and are both parallelograms. The second profile and the third profile are arranged adjacent to each other. A second shallow groove (32) is provided around the outer circle of the second profile, and a third shallow groove (33) is provided around the outer circle of the third profile. The second shallow groove (32) includes a first end, a second end, a third end, and a fourth end connected in sequence, the first end being a starting end connected to the second pattern groove (22), the second end and the third end being located inside the second pattern block (12), the fourth end being a terminating end connected to the second pattern groove (22), the shallow groove connecting the third end and the fourth end extending toward the first pattern groove (21) and being provided with a first auxiliary shallow groove (41), the first auxiliary shallow groove (41) being connected to the first pattern groove (21); The third shallow groove (33) includes a first end, a second end, a third end, and a fourth end connected in sequence, the first end being a starting end connected to the first pattern groove (21), the second end and the third end being located inside the second pattern block (12), the fourth end being a terminating end connected to the first pattern groove (21), the shallow groove connecting the third end and the fourth end extending toward the second pattern groove (22) and being provided with a second auxiliary shallow groove (42), the second auxiliary shallow groove (42) being connected to the second pattern groove (22); A circumferentially arranged third auxiliary shallow groove (43) is provided between the second shallow groove (32) and the third shallow groove (33), and the third auxiliary shallow groove (43) communicates with the shallow groove connecting the first end and the second end of the second shallow groove (32) and the shallow groove connecting the first end and the second end of the third shallow groove (33); and a plurality of mutually parallel circumferentially arranged fourth shallow grooves (34) are provided within the second contour and the third contour; The pattern on the fourth pattern block (14) and the pattern on the second pattern block (11) are centrally symmetrical to each other; The third pattern block (13) is a central pattern block. The third pattern block (13) is provided with a fourth profile and a fifth profile arranged at intervals in the circumferential direction. The fourth profile is arranged adjacent to the fifth profile. The fourth profile and the fifth profile both extend from the second pattern groove (22) to the third pattern groove (23) and are in an inclined "Z" shape. A fifth shallow groove (35) and a sixth shallow groove (36) are provided in the inner circles of the fourth profile and the fifth profile respectively. The two ends of the fifth shallow groove (35) and the sixth shallow groove (36) are connected to the second pattern groove (22) and the third pattern groove (23) respectively. The fifth shallow groove (35) and the sixth shallow groove (36) both include two inclined grooves and a longitudinal groove connected to the inclined groove. The inclined groove of the fifth shallow groove (35) communicating with the second pattern groove (22) is extended to be provided with a fourth auxiliary shallow groove (44), and the fourth auxiliary shallow groove (44) is connected to the inclined groove of the fifth shallow groove (35) and the third pattern groove (23); the inclined groove of the sixth shallow groove (36) communicating with the third pattern groove (23) is extended to be provided with a fifth auxiliary shallow groove (45), and the fifth auxiliary shallow groove (45) is connected to the inclined groove of the sixth shallow groove (36) and the second pattern groove (22).

2. The tire tread structure according to claim 1, characterized in that: The cross section of the first shallow groove (31), the second shallow groove (32), the third shallow groove (33), the fifth shallow groove (35), the sixth shallow groove (36), the first auxiliary shallow groove (41), the second auxiliary shallow groove (42), the third auxiliary shallow groove (43), the fourth auxiliary shallow groove (44) or the fifth auxiliary shallow groove (45) is a rounded rectangular shape with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm; The fourth shallow groove (34) has a groove depth of 1 mm and a groove width of 2 mm.

3. The tire tread structure according to claim 1, characterized in that: The first pattern groove (21) and the fourth pattern groove (24) are bilaterally symmetrical, and the groove bottoms are both rounded; the first pattern groove (21) has a groove depth of 18 mm and a groove width of 13 mm, and the left groove wall is inclined 18°50′ from the center, and the right groove wall is inclined 13°10′ from the center.

4. The tire tread structure according to claim 1, characterized in that: The second groove (22) and the third groove (23) are bilaterally symmetrical, and the groove bottoms are both rounded; the second groove (22) has a groove depth of 18 mm, a groove width of 12 mm, a rounded corner depth of 3 mm, a left groove wall inclined 19° from the center, and a right groove wall inclined 13° from the center.

5. The tire tread structure according to claim 4, characterized in that: The radius of the circle where the arc included in the rounded corner is 5 mm.

6. An all-steel tire, characterized in that: The tread pattern of the all-steel tire adopts the tire pattern structure described in any one of claims 1 to 5.

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