Tire with improved wet grip

Abstract

The present application discloses a tire with improved wet grip, comprising: a tire body, provided with a tread portion, the central part of the tread portion is defined as a tread center line, the tread portion is divided into a first tread and a second tread in a width direction; a plurality of main groove units and a plurality of secondary groove units are arranged on the tread portion in a mirror image manner in the width direction, the secondary groove unit comprises a first secondary groove and a second secondary groove; the main groove unit and the secondary groove unit are respectively provided with a progressive pattern design, and the groove width gradually increases from thin to wide, which can improve the drainage performance of the tire and the wet ground grip effect.

Description

TECHNICAL FIELD

[0001] The present application relates to a tire pattern structure that can increase drainage and wet ground grounding. BACKGROUND

[0002] In order to make the tire suitable for wet road surface, the common tire used by the vehicle currently has a pattern structure formed on the tire tread, and a plurality of circular arc grooves are provided on the shoulder portion, so as to use the groove structure to assist drainage, so as to increase the driving stability. The prior art tire cannot effectively break water during drainage, which leads to poor stability and easy tire slip.

[0003] In addition, on January 20, 2016, the Chinese invention CN102753363 was announced, which disclosed a two-wheeled vehicle tire including a tread with sipe pattern. The tire includes a tread including a plurality of sipes. The length of the sipe is 1.2 times or less of the width of the surface of the contact area, and at least one sipe has at least one end leading to a groove with a width of 2.5 mm or more and a length of 2.5 and 10 mm in the tread.

[0004] The prior art uses sipe and groove across the pattern, which has good wet breaking water capacity, but too much across the tread portion may cause insufficient tread rigidity, which may affect the safety during driving, so the use is still not ideal.

[0005] In addition, the commonly seen tires on the market have poor drainage, which leads to reduced wet grip, and thus long braking distance and other shortcomings. SUMMARY

[0006] Therefore, in view of the shortcomings of some existing tire structures, the purpose of the present application is to provide a tire with improved wet grip.

[0007] The present application provides a tire with improved wet grip, comprising: a tire body, a tire tread is arranged on the circumference of the tire body, two sides of the tire tread are respectively arranged as a first side edge and a second side edge, a tire center line is defined in the center of the tire tread, the tire center line divides the tire tread into a first tire tread and a second tire tread in a width direction; at least one main groove unit, the tire center line is used as a reference, a plurality of main groove units are arranged on the first tire tread and the second tire tread in a mirror image manner in the width direction, the area of the main groove unit across the first tire tread or the second tire tread is between 60% and 90%, the proportion of the area of the main groove unit to the area of the first tire tread or the second tire tread is between 4% and 8%, the proportion of the area of the main groove unit to the total area of the tire tread is between 2% and 4%, the first included angle between the main groove extension line of the main groove unit and the tire center line is between 50° and 55°, the depth of the main groove unit is between 2mm and 5mm, and the circumference of the main groove unit is sequentially connected by a first side wall, a second side wall, a third side wall and a fourth side wall, the first fillet radius of the first side wall is between 75mm and 94mm, the second fillet radius of the second side wall is between 60mm and 75mm, and the third fillet radius of the third side wall is between 7mm and 10mm.At least one pair of groove units is arranged on the tread portion in a mirror symmetry in the width direction with the tread centerline as a reference. The pair of groove units is adjacent to the main groove unit. The pair of groove units at least includes a first sub-groove and a second sub-groove. The first sub-groove respectively spans an area of the first tread or the second tread in the width direction, which is between 60% and 90%. The area of the first sub-groove accounts for 4% to 8% of the area of the first tread or the second tread, respectively. The area of the first sub-groove accounts for 2% to 4% of the total area of the tread portion. A first sub-groove extension line of the first sub-groove and a second angle of the tread centerline are between 30° and 60°. The depth of the first sub-groove is between 3mm and 6mm. The circumference of the first sub-groove is sequentially connected by a fifth edge wall, a sixth edge wall, a seventh edge wall, and an eighth edge wall. The fifth edge wall has a fifth fillet radius of 126mm to 157mm. The sixth edge wall has a sixth fillet radius of 98mm to 120mm. The seventh edge wall has a seventh fillet radius of 36mm to 45mm. The eighth edge wall has an eighth fillet radius of 36mm to 45mm. The second sub-groove respectively spans an area of the first tread or the second tread in the width direction, which is between 60% and 90%. The area of the second sub-groove accounts for 2% to 4% of the area of the first tread or the second tread, respectively. The area of the second sub-groove accounts for 1% to 2% of the total area of the tread portion. A second sub-groove extension line of the second sub-groove and a third angle of the tread centerline are between 40° and 55°. The depth of the second sub-groove is between 2mm and 5mm. The circumference of the second sub-groove is sequentially connected by a ninth edge wall, a tenth edge wall, an eleventh edge wall, a twelfth edge wall, and a thirteenth edge wall. The ninth edge wall has a ninth fillet radius of 71mm to 90mm. The tenth edge wall has a tenth fillet radius of 81mm to 100mm. The eleventh edge wall has an eleventh fillet radius of 6mm to 8mm. The twelfth edge wall has a twelfth fillet radius of 18mm to 22mm. The thirteenth edge wall has a thirteenth fillet radius of 19mm to 80mm.

[0008] The area of the main groove unit accounts for 8% of the area of the first tread or the second tread, respectively. The area of the main groove unit accounts for 4% of the total area of the tread portion.

[0009] The first tread is divided into five equal parts by four equal lines, and the second tread is divided into five equal parts by four equal lines. Eight more equal lines are defined sequentially from the tread centerline toward the first side and the second side: a first equal line, a second equal line, a third equal line, and a fourth equal line. The depth of the first section where the main groove unit intersects the second equal line is 4.3 mm or 4.8 mm; the depth of the second section where it intersects the third equal line is 3.6 mm, 3.8 mm, or 4.7 mm; and the depth of the third section where it intersects the fourth equal line is 2.7 mm, 3.2 mm, or 3.9 mm.

[0010] The first fillet radius is 83.5mm, 75mm or 94mm, the second fillet radius is 66mm, 60mm or 75mm, and the third fillet radius is 8mm, 7mm or 10mm.

[0011] The first intersection point where the first sidewall and the second sidewall connect has a first distance between the first intersection point and the center line of the tread between 20.2 mm and 24.8 mm; the second distance between the first intersection point and a dividing line is between 49.5 mm and 51.6 mm; the second intersection point where the second sidewall and the third sidewall connect has a third distance between the second intersection point and the center line of the tread between 42.5 mm and 47.5 mm; the fourth distance between the second intersection point and the dividing line is between 12.5 mm and 16.5 mm; and the third intersection point where the third sidewall and the fourth sidewall connect... The fifth distance from the center line of the tread is between 49.8 mm and 63.4 mm; the sixth distance from the third intersection point to the dividing line is between 10.1 mm and 12.7 mm; the seventh distance from the fourth intersection point where the fourth sidewall connects to the first sidewall to the center line of the tread is between 56.8 mm and 70.7 mm; the eighth distance from the fourth intersection point to the dividing line is between 12.6 mm and 15.4 mm; the dividing line is parallel to the width direction and perpendicular to the first, second, third, and fourth dividing lines.

[0012] The first distance is 20.5mm, 20.2mm, or 24.8mm; the second distance is 49.5mm or 51.6mm; the third distance is 47.5mm or 42.5mm; the fourth distance is 13.6mm or 12.5mm; the fifth distance is 63.4mm; the sixth distance is 11.2mm or 10.3mm; the seventh distance is 70.7mm; and the eighth distance is 13.6mm, 12.6mm, or 15.4mm.

[0013] The first sub-groove has a fifth cross-sectional depth of 5.1 mm, 4.5 mm, or 4.8 mm at a fourth intersection with the first dividing line, a sixth cross-sectional depth of 4.3 mm, or 4.8 mm at a fifth intersection with the second dividing line, a seventh cross-sectional depth of 4.3 mm, 3.8 mm, or 4.7 mm at a sixth intersection with the third dividing line, and an eighth cross-sectional depth of 3.6 mm, 3.2 mm, or 3.9 mm at a seventh intersection with the fourth dividing line.

[0014] The first sub-groove has a fifth cross-sectional depth of 5.1 mm, 4.5 mm, or 4.8 mm at a fourth intersection with the first dividing line, a sixth cross-sectional depth of 4.3 mm, or 4.8 mm at a fifth intersection with the second dividing line, a seventh cross-sectional depth of 4.3 mm, 3.8 mm, or 4.7 mm at a sixth intersection with the third dividing line, and an eighth cross-sectional depth of 3.6 mm, 3.2 mm, or 3.9 mm at a seventh intersection with the fourth dividing line.

[0015] The first sub-groove has a fifth cross-sectional depth of 5.1 mm, 4.5 mm, or 4.8 mm at a fourth intersection with the first dividing line, a sixth cross-sectional depth of 4.3 mm, or 4.8 mm at a fifth intersection with the second dividing line, a seventh cross-sectional depth of 4.3 mm, 3.8 mm, or 4.7 mm at a sixth intersection with the third dividing line, and an eighth cross-sectional depth of 3.6 mm, 3.2 mm, or 3.9 mm at a seventh intersection with the fourth dividing line.

[0016] The first sub-groove has a fifth cross-sectional depth of 5.1 mm, 4.5 mm, or 4.8 mm at a fourth intersection with the first dividing line, a sixth cross-sectional depth of 4.3 mm, or 4.8 mm at a fifth intersection with the second dividing line, a seventh cross-sectional depth of 4.3 mm, 3.8 mm, or 4.7 mm at a sixth intersection with the third dividing line, and an eighth cross-sectional depth of 3.6 mm, 3.2 mm, or 3.9 mm at a seventh intersection with the fourth dividing line.

[0017] The ninth distance of the first sub-groove is 9.6 mm, 9.9 mm or 11.9 mm, the tenth distance is 90.8 mm, 81.1 mm or 100.2 mm, the eleventh distance is 53.9 mm, 48.2 mm or 59.6 mm, the twelfth distance is 46.4 mm, 42.7 mm or 52.4 mm, the thirteenth distance is 68.9 mm, 61.1 mm or 75.7 mm, the fourteenth distance is 29 mm or 35.1 mm, the fifteenth distance is 64 mm, 57.2 mm or 70.7 mm, and the sixteenth distance is 45.3 mm, 41.7 mm or 51.2 mm.

[0018] The first and second tread surfaces are divided into five equal parts by four equal lines, and the second tread surface is divided into five equal parts by four equal lines. The eight equal lines are defined as a first equal line, a second equal line, a third equal line and a fourth equal line from the center line of the tread to the first side edge and the second side edge in sequence. The eighth cross-sectional depth of the second sub-groove intersecting the third equal line is 3.6 mm, 3.8 mm or 4.7 mm, and the ninth cross-sectional depth of the second sub-groove intersecting the fourth equal line is 2.7 mm, 3.2 mm or 3.9 mm.

[0019] The ninth fillet radius of the second sub-groove is 80 mm, the tenth fillet radius is 90 mm, the eleventh fillet radius is 7 mm, the twelfth fillet radius is 20 mm, 18 mm or 22 mm, and the thirteenth fillet radius is 80 mm, 19 mm or 22 mm.

[0020] A ninth intersection of the ninth side wall and the tenth side wall, a seventeenth distance of the ninth intersection from the centerline is between 28.7mm and 36.6mm, an eighteenth distance of the ninth intersection from a dividing line is between 85mm and 104.8mm, a tenth intersection of the tenth side wall and the eleventh side wall, a nineteenth distance of the tenth intersection from the centerline is between 46.8mm and 57.9mm, a twentieth distance of the tenth intersection from the dividing line is between 70.9mm and 87mm, an eleventh intersection of the eleventh side wall and the twelfth side wall, a twenty first distance of the eleventh intersection from the centerline is between 46.7mm and 57.9mm, a twenty second distance of the eleventh intersection from the dividing line is between 66.9mm and 82.2mm, a twelfth intersection of the twelfth side wall and the thirteenth side wall, a twenty third distance of the twelfth intersection from the centerline is between 53.6mm and 66.4mm, a twenty fourth distance of the twelfth intersection from the dividing line is between 61.3mm and 75.1mm, a thirteenth intersection of the thirteenth side wall and the ninth side wall, a twenty fifth distance of the thirteenth intersection from the centerline is between 51.4mm and 63.6mm, a twenty sixth distance of the thirteenth intersection from the dividing line is between 73mm and 89.6mm, the dividing line is parallel to the width direction, and perpendicular to the first, second, third and fourth bisectors.

[0021] The seventeenth distance of the second sub-groove is 28.7mm, 30.5mm or 36.6mm, the eighteenth distance is 94.5mm, 85mm or 104.8mm, the nineteenth distance is 52.4mm or 46.8mm, the twentieth distance is 77mm, 70.9mm or 87mm, the twenty first distance is 52.2mm, 46.7mm or 57.9mm, the twenty second distance is 72.7mm or 66.9mm, the twenty third distance is 61mm or 53.6mm, the twenty fourth distance is 65.7mm or 61.3mm, the twenty fifth distance is 57.5mm or 51.4mm, and the twenty sixth distance is 79.3mm or 73mm.

[0022] The further provided at least one shallow groove unit is arranged on the tread portion in a mirror image manner in the width direction with the centerline as a reference, the area of the shallow groove unit is between 60% and 90% of the area of the first or second tread, the area of the shallow groove unit accounts for between 2% and 4% of the area of the first or second tread, and the shallow groove unit is connected to the first and second sub-grooves.

[0023] The above-mentioned shallow groove unit comprises two first shallow grooves, a second shallow groove, a third shallow groove and a fourth shallow groove. A first shallow groove extension line of the first shallow groove forms a fourth angle with the tire center line, which is between 40° and 70°. A second shallow groove extension line of the second shallow groove forms a fifth angle with the tire center line, which is between 40° and 55°. A third shallow groove extension line of the third shallow groove forms a sixth angle with the tire center line, which is between 30° and 35°. A fourth shallow groove extension line of the fourth shallow groove forms a seventh angle with the tire center line, which is between 30° and 40°. The depths of the two first shallow grooves, the second shallow groove, the third shallow groove and the fourth shallow groove are between 1mm and 1.5mm. The periphery of the first shallow groove is sequentially connected by a fourteenth edge wall, a fifteenth edge wall and a sixteenth edge wall. A fourteenth fillet radius of the fourteenth edge wall is between 13mm and 16mm. A fifteenth fillet radius of the fifteenth edge wall is between 18mm and 22mm. A sixteenth fillet radius of the sixteenth edge wall is between 5mm and 6mm. The periphery of the second shallow groove is sequentially connected by a seventeenth edge wall, an eighteenth edge wall and a nineteenth edge wall. A seventeenth fillet radius of the seventeenth edge wall is between 97mm and 120mm. An eighteenth fillet radius of the eighteenth edge wall is between 27mm and 33mm. A nineteenth fillet radius of the nineteenth edge wall is between 9mm and 11mm. The periphery of the third shallow groove is sequentially connected by a twentieth edge wall, a twenty-first edge wall and a twenty-second edge wall. A twentieth fillet radius of the twentieth edge wall is between 108.5mm and 120mm. A twenty-first fillet radius of the twenty-first edge wall is between 64mm and 77mm. A twenty-second fillet radius of the twenty-second edge wall is between 9mm and 11mm. The periphery of the fourth shallow groove is sequentially connected by a twenty-third edge wall, a twenty-fourth edge wall, a twenty-fifth edge wall, a twenty-sixth edge wall and a twenty-seventh edge wall. A twenty-third fillet radius of the twenty-third edge wall is between 13mm and 15mm. A twenty-fourth fillet radius of the twenty-fourth edge wall is between 19mm and 22mm. A twenty-fifth fillet radius of the twenty-fifth edge wall is between 2.5mm to 6mm, a second twenty-sixth fillet radius of the second twenty-sixth side wall is between 10mm to 12mm, a second twenty-seventh fillet radius of the second twenty-seventh side wall is between 6mm to 11mm, a groove width of the sipe unit is gradually widened from the centerline of the tread towards the first side edge and the second side edge, the eighteenth side wall and the nineteenth side wall are connected to a fourteenth intersection point, the dividing line comprises a plurality of first dividing lines and a plurality of second dividing lines, the plurality of first dividing lines on the first tread respectively pass through the fourteenth intersection point of the corresponding second sipe on the second tread, and the plurality of second dividing lines on the second tread respectively pass through the fourteenth intersection point of the corresponding second sipe on the first tread.

[0024] The further technical feature is further provided with at least one sipe unit, the plurality of sipe units are arranged on the tread portion in a mirror image manner in the width direction, the sipe unit is respectively across the region of the first tread or the second tread in the width direction, and the region is between 60% to 90%, the sipe unit is connected to the main groove unit, the first auxiliary groove and the second auxiliary groove.

[0025] The sipe unit comprises a first sipe, a second sipe and a third sipe, a first sipe extension line of the first sipe and an eighth angle of the centerline of the tread are between 25° to 50°, a second sipe extension line of the second sipe and a ninth angle of the centerline of the tread are between 20° to 50°, a third sipe extension line of the third sipe and a tenth angle of the centerline of the tread are between 60° to 75°, the depth of the first sipe, the second sipe and the third sipe is 0.5mm, and the width is 0.5mm, the first sipe is connected between the second sipe and the third sipe, a second twenty-eighth fillet radius of the first sipe is between 149mm to 170mm, a second twenty-ninth fillet radius of the second sipe is between 126mm to 145mm, and a third thirtieth fillet radius of the third sipe is between 117mm to 135mm.

[0026] The groove width of the main groove unit and the auxiliary groove unit is gradually widened from the centerline of the tread towards the first side edge and the second side edge.

[0027] The technical feature has the following advantages:

[0028] 1. The main groove unit presents a gradual pattern design, and the groove width is gradually widened to increase the drainage performance of the tire and the wet ground contact effect.

[0029] 2. By the first sub-groove and the second sub-groove, the progressive pattern design is presented, and the groove width is changed from thin to wide, so that the tire drainage and the wet ground contact effect can be increased.

[0030] 3. By the shallow groove unit connected to the first sub-groove and the second sub-groove, the water film breaking and the wet ground contact effect can be increased.

[0031] 4. The fine line unit is connected to the main groove unit, the first sub-groove and the second sub-groove, and the overall presents the aggressive pattern design like the claw, so that the speed and the better ground contact of the tire can be given. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a perspective view of the embodiment of the present application.

[0033] Figure 2 It is a front view of the embodiment of the present application.

[0034] Figure 3 It is a partial planar enlarged view of the embodiment of the present application.

[0035] Figure 4 It is an enlarged unit view of the main groove unit and the sub-groove unit of the embodiment of the present application.

[0036] Figure 5 It is a schematic view of the main groove unit of the 110 / 70-12 tire of the embodiment of the present application showing the cross-sectional position and the fillet radius.

[0037] Figure 6 It is a schematic view of the main groove unit of the 100 / 90-10 tire of the embodiment of the present application showing the cross-sectional position and the fillet radius.

[0038] Figure 7 It is a schematic view of the main groove unit of the 120 / 70-15 tire of the embodiment of the present application showing the cross-sectional position and the fillet radius.

[0039] Figure 8 It is a schematic view of the main groove unit of the 110 / 70-12 tire of the embodiment of the present application showing the intersection position and the distance.

[0040] Figure 9 It is a schematic view of the main groove unit of the 100 / 90-10 tire of the embodiment of the present application showing the intersection position and the distance.

[0041] Figure 10 It is a schematic view of the main groove unit of the 120 / 70-15 tire of the embodiment of the present application showing the intersection position and the distance.

[0042] Figure 11 It is a schematic view of the first sub-groove unit of the 110 / 70-12 tire of the embodiment of the present application showing the cross-sectional position and the fillet radius.

[0043] Figure 12 Schematic view of the intersection position and distance of the first secondary groove for the embodiment 100 / 90-10 tire of the present application.

[0044] Figure 13 Schematic view of the intersection position and distance of the first secondary groove for the embodiment 120 / 70-15 tire of the present application.

[0045] Figure 14 Schematic view of the intersection position and distance of the first secondary groove for the embodiment 110 / 70-12 tire of the present application.

[0046] Figure 15 Schematic view of the intersection position and distance of the first secondary groove for the embodiment 100 / 90-10 tire of the present application.

[0047] Figure 16 Schematic view of the intersection position and distance of the first secondary groove for the embodiment 120 / 70-15 tire of the present application.

[0048] Figure 17 Schematic view of the intersection position and distance of the second secondary groove unit for the embodiment 110 / 70-12 tire of the present application.

[0049] Figure 18 Schematic view of the intersection position and distance of the second secondary groove for the embodiment 100 / 90-10 tire of the present application.

[0050] Figure 19 Schematic view of the intersection position and distance of the second secondary groove for the embodiment 120 / 70-15 tire of the present application.

[0051] Figure 20 Schematic view of the intersection position and distance of the second secondary groove for the embodiment 110 / 70-12 tire of the present application.

[0052] Figure 21 Schematic view of the intersection position and distance of the second secondary groove for the embodiment 100 / 90-10 tire of the present application.

[0053] Figure 22 Schematic view of the intersection position and distance of the second secondary groove for the embodiment 120 / 70-15 tire of the present application.

[0054] Figure 23 Schematic view of the enlarged unit of the shallow groove unit for the embodiment of the present application.

[0055] Figure 24 Schematic view of the intersection position and distance of the second secondary groove for the embodiment 110 / 70-12 tire of the present application.

[0056] Figure 25Schematic view of the fillet radius for the sipe unit of the 100 / 90-10 tire of the present application embodiment.

[0057] Figure 26 Schematic view of the fillet radius for the sipe unit of the 120 / 70-15 tire of the present application embodiment.

[0058] Figure 27 Enlarged view of the sipe unit of the present application embodiment.

[0059] Figure 28 Schematic view of the fillet radius for the sipe unit of the 110 / 70-12 tire of the present application embodiment.

[0060] Figure 29 Schematic view of the fillet radius for the sipe unit of the 100 / 90-10 tire of the present application embodiment.

[0061] Figure 30 Schematic view of the fillet radius for the sipe unit of the 120 / 70-15 tire of the present application embodiment.

[0062] Figure 31 XXXI-XXXI sectional view of the present application embodiment Figure 4 .

[0063] Figure 32 XXXII-XXXII sectional view of the present application embodiment Figure 4 .

[0064] Figure 33 XXXIII-XXXIII sectional view of the present application embodiment Figure 4 .

[0065] Figure 34 XXXIV-XXXIV sectional view of the present application embodiment Figure 23 .

[0066] Figure 35 XXXV-XXXV sectional view of the present application embodiment Figure 23 .

[0067] Figure 36 XXXVI-XXXVI sectional view of the present application embodiment Figure 23 .

[0068] Figure 37 XXXVII-XXXVII sectional view of the present application embodiment Figure 23 .

[0069] Figure 38 XXXVIII-XXXVIII sectional view of the present application embodiment Figure 27 .

[0070] Figure 39 A schematic view of the passing positions of the first and second dividing lines on the first and second treads of the embodiment of the present application.

[0071] BRIEF DESCRIPTION OF THE DRAWINGS

[0072] 1-tire body; 11-tread portion; 12-first side edge; 13-second side edge; 14-tread center line; 15-first tread; 16-second tread; 171-first bisector; 172-second bisector; 173-third bisector; 174-fourth bisector; 2-main groove unit; 20-main groove extension line; 21-first side wall; 22-second side wall; 23-third side wall; 24-fourth side wall; 3-first sub groove; 30-first sub groove extension line; 31-fifth side wall; 32-sixth side wall; 33-seventh side wall; 34-eighth side wall; 4-second sub groove; 40-second sub groove extension line; 41-ninth side wall; 42-tenth side wall; 43-eleventh side wall; 44-twelfth side wall; 45-thirteenth side wall; 5-shallow groove unit; 51-first shallow groove; 51A-first end point; 51B-second end point; 510-first shallow groove extension line; 511-fourteenth side wall; 512-fifteenth side wall; 513-sixteenth side wall; 52-second shallow groove; 52A-third end point; 52B-fourth end point; 520-second shallow groove extension line; 521-seventeenth side wall; 522-eighteenth side wall; 523-nineteenth side wall; 53-third shallow groove; 53A-fifth end point; 53B-sixth end point; 530-third shallow groove extension line; 531-twentieth side wall; 532-twenty-first side wall; 533-twenty-second side wall; 54-fourth shallow groove; 54A-seventh end point; 54B-eighth end point; 540-fourth shallow groove extension line; 541-twenty-third side wall; 542-twenty-fourth side wall; 543-twenty-fifth side wall; 544-twenty-sixth side wall; 545-twenty-seventh side wall; 6-fine line unit; 61-first fine line; 61A-ninth end point; 61B-tenth end point; 610-first fine line extension line; 62-second fine line; 62A-eleventh end point; 620-second fine line extension line; 63-third fine line; 63A-twelfth end point; 630-third fine line extension line; A1-first included angle; A2-second included angle; A3-third included angle; A4-fourth included angle; A5-fifth included angle; A6-sixth included angle; A7-seventh included angle; A8-eighth included angle; A9-ninth included angle; A10-tenth included angle; B1-first cross-sectional depth; B2-second cross-sectional depth; B3-third cross-sectional depth; B4-fourth cross-sectional depth; B5-fifth cross-sectional depth; B6-sixth cross-sectional depth; B7-seventh cross-sectional depth; B8-eighth cross-sectional depth; B9-ninth cross-sectional depth; C1-first fillet radius; C2-second fillet radius; C3-third fillet radius; C5-fifth fillet radius; C6-sixth fillet radius; C7-seventh fillet radius; C8-eighth fillet radius; C9-ninth fillet radius; C10-tenth fillet radius; C11-eleventh fillet radius; C12-twelfth fillet radius; C13-thirteenth fillet radius; C14-fourteenth fillet radius; C15-fifteenth fillet radius; C16-sixteenth fillet radius;C17 - Seventeenth fillet radius; C18 - Eighteenth fillet radius; C19 - Nineteenth fillet radius; C20 - Twentieth fillet radius; C21 - Twenty-First fillet radius; C22 - Twenty-Second fillet radius; C23 - Twenty-Third fillet radius; C24 - Twenty-Fourth fillet radius; C25 - Twenty-Fifth fillet radius; C26 - Twenty-Sixth fillet radius; C27 - Twenty- Seventh fillet radius; C28 - Twenty-Eighth fillet radius; C29 - Twenty-Ninth fillet radius; C30 - Thirtieth fillet radius; D1 - First intersection point; D2 - Second intersection point; D3 - Third intersection point; D4 - Fourth intersection point; D5 - Fifth intersection point; D6 - Sixth intersection point; D7 - Seventh intersection point; D8 - Eighth intersection point; D9 - Ninth intersection point; D10 - Tenth intersection point; D11 - Eleventh intersection point; D12 - Twelfth intersection point; D13 - Thirteenth intersection point; D14 - Fourteenth intersection point; E1 - First distance; E2 - Second distance; E3 - Third distance; E4 - Fourth distance; E5 - Fifth distance; E6 - Sixth distance; E7 - Seventh distance; E8 - Eighth distance; E9 - Ninth distance; E10 - Tenth distance; E11 - Eleventh distance; E12 - Twelfth distance; E13 - Thirteenth distance; E14 - Fourteenth distance; E15 - Fifteenth distance; E16 - Sixteenth distance; E17 - Seventeenth distance; E18 - Eighteenth distance; E19 - Nineteenth distance; E20 - Twentieth distance; E21 - Twenty-First distance; E22 - Twenty-Second distance; E23 - Twenty-Third distance; E24 - Twenty-Fourth distance; E25 - Twenty-Fifth distance; E26 - Twenty-Sixth distance; X - Width direction; Y1 - First dividing line; Y2 - Second dividing line. DETAILED DESCRIPTION

[0073] Referring to Figures 1 to 4 illustrated, the present application provides a tire with improved wet grip, comprising a tire body 1, a main groove unit 2, a secondary groove unit comprising a first secondary groove 3 and a second secondary groove 4, a shallow groove unit 5, and a fine groove unit 6, wherein:

[0074] The tire body 1 is provided with a circumferential tread portion 11, and two sides of the tread portion 11 are respectively provided with a first side edge 12 and a second side edge 13. The central part of the tread portion 11 defines a tread center line 14, which divides the tread portion 11 into a first tread 15 and a second tread 16 in a width direction X. The first tread 15 and the second tread 16 are respectively divided into five equal parts by four equal division lines, and the eight equal division lines are sequentially defined as a first equal division line 171, a second equal division line 172, a third equal division line 173, and a fourth equal division line 174 from the tread center line 14 towards the first side edge 12 and the second side edge 13, respectively. Figure 4 illustrated), and are respectively divided into five equal parts, and the eight equal division lines are sequentially defined as a first equal division line 171, a second equal division line 172, a third equal division line 173, and a fourth equal division line 174 from the tread center line 14 towards the first side edge 12 and the second side edge 13, respectively. Figure 2 and Figure 3As shown, taking the center line 14 of the tread as a reference, a plurality of first dividing lines Y1 and second dividing lines Y2 are respectively provided laterally on the first tread 15 and the second tread 16, parallel to the width direction X and perpendicular to the first dividing line 171 to the fourth dividing line 174. Furthermore, the plurality of first dividing lines Y1 on the first tread 15 are offset from the plurality of second dividing lines Y2 on the second tread 16, making the plurality of tread pattern combinations on the first tread 15 and the second tread 16 asymmetrical. In the following description of this embodiment, a single tread pattern combination on the second tread 16 is used, and all dimensional measurements are based on the second dividing line Y2.

[0075] Main trench unit 2, such as Figures 2 to 4 As shown, with the tread centerline 14 as a reference, multiple main groove units 2 are continuously arranged in a mirror-like manner on the first tread 15 and the second tread 16 of the tire tread portion 11 in the width direction X. The groove width of the main groove unit 2 gradually widens from the tread centerline 14 toward the first side 12 and the second side 13, thereby effectively improving the tire's water drainage and wet contact feel. The area of ​​the main groove unit 2 spanning the first tread 15 or the second tread 16 in the width direction X is between 60% and 90%, with an optimal spanning area of ​​75%. The area of ​​the main groove unit 2 relative to the area of ​​the first tread 15 or the second tread 16 is between 4% and 8%, with an optimal 8%. The "percentage ratio" refers to the proportion of the tread groove area to the tire tread area. The area of ​​the main groove unit 2 accounts for 2% to 4% of the total area of ​​the tread 11, with the optimal proportion being 4%. Furthermore, the main groove extension line 20 of the main groove unit 2 forms a first angle A1 with the tread centerline 14, which is between 50° and 55°. The main groove extension line 20 originates from one end of the main groove unit 2 (the fourth intersection point D4, as shown below). Figure 8 As shown) through the other end (first intersection point D1, as shown) Figure 8 As shown), and a straight line extending to the center line 14 of the tread. The main groove unit 2 passes through the second bisector 172, the third bisector 173 and the fourth bisector 174.

[0076] like Figure 4 and Figure 31 As shown, the depth of the main groove unit 2 is between 2mm and 5mm. The depth varies depending on the tire size; for example, for a 110 / 70-12 tire... Figure 5As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 6 As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 7 As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm.

[0077] As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 5 As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 5 As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 6 As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 7 As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm.

[0078] As shown, the first cross-sectional depth B1 of the main groove unit 2 intersecting the second bisector 172 is 4.3 mm, the second cross-sectional depth B2 intersecting the third bisector 173 is 3.6 mm, and the third cross-sectional depth B3 intersecting the fourth bisector 174 is 2.7 mm. For a 100 / 90-10 tire, as shown in FIG. 1A, the first cross-sectional depth B1 of the main groove unit 2 is 4.3 mm, the second cross-sectional depth B2 is 3.8 mm, and the third cross-sectional depth B3 is 3.2 mm. Figure 8As shown, there is a first intersection point D1 connecting the first sidewall 21 and the second sidewall 22. The first distance E1 between the first intersection point D1 and the tread centerline 14 is between 20mm and 25mm, and the second distance E2 between the first intersection point D1 and the second dividing line Y2 is between 41mm and 51.6mm. There is a second intersection point D2 connecting the second sidewall 22 and the third sidewall 23. The third distance E3 between the second intersection point D2 and the tread centerline 14 is between 42mm and 53.4mm, and the fourth distance E4 between the second intersection point D2 and the second dividing line Y2 is between 12.5mm and 16.5mm. The third intersection point D3 connecting the third sidewall 23 and the fourth sidewall 24 has a fifth distance E5 between the third intersection point D3 and the tread centerline 14, which is between 49.8mm and 63.4mm. The sixth distance E6 between the third intersection point D3 and the second dividing line Y2 is between 10.1mm and 12.7mm. The fourth intersection point D4 connecting the fourth sidewall 24 and the first sidewall 21 has a seventh distance E7 between the fourth intersection point D4 and the tread centerline 14, which is between 56.8mm and 70.7mm. The eighth distance E8 between the fourth intersection point D4 and the second dividing line Y2 is between 12.6mm and 15.4mm. The distances differ for different tire sizes; for example, for a 110 / 70-12 tire... Figure 8 As shown, the first distance E1 of the main groove unit 2 is 20.5mm, the second distance E2 is 49.5mm, the third distance E3 is 47.5mm, the fourth distance E4 is 13.6mm, the fifth distance E5 is 55.7mm, the sixth distance E6 is 11.2mm, the seventh distance E7 is 64.9mm, and the eighth distance E8 is 13.6mm. (100 / 90-10 tire, such as...) Figure 9 As shown, the first distance E1 of the main groove unit 2 is 20.2mm, the second distance E2 is 41.5mm, the third distance E3 is 42.5mm, the fourth distance E4 is 12.5mm, the fifth distance E5 is 49.8mm, the sixth distance E6 is 10.3mm, the seventh distance E7 is 56.8mm, and the eighth distance E8 is 12.6mm. (120 / 70-15 tire, such as...) Figure 10 As shown, the first distance E1 of the main trench unit 2 is 24.8 mm, the second distance E2 is 51.6 mm, the third distance E3 is 42.5 mm, the fourth distance E4 is 12.5 mm, the fifth distance E5 is 63.4 mm, the sixth distance E6 is 12.7 mm, the seventh distance E7 is 70.7 mm, and the eighth distance E8 is 15.4 mm.

[0079] Secondary trench unit, such as Figure 4 and Figure 11As shown, with the centerline 14 of the tread as a reference, multiple arrays of the secondary groove units are continuously arranged in a mirror manner on the tread portion 11 in the width direction X (e.g., Figure 1 and Figure 2 As shown, the width of the secondary groove unit gradually widens from the tread centerline 14 towards the first sidewall 12 and the second sidewall 13, thereby effectively improving the tire's drainage performance and wet contact patch. Each set of secondary groove units is arranged adjacent to the main groove unit 2. Each secondary groove unit includes at least one first secondary groove 3 and one second secondary groove 4. The first secondary groove 3, in the width direction X, spans the area of ​​the first tread 15 or the second tread 16, respectively, between 60% and 90%, with an optimal span of 75%. The area of ​​the first secondary groove 3 as a percentage of the area of ​​the first tread 15 or the second tread 16 is between 4% and 8%, with an optimal percentage of 8%. The area of ​​the first secondary groove 3 as a percentage of the total area of ​​the tread portion 11 is between 2% and 4%, with an optimal percentage of 4%. The first secondary groove 3's extension line 30 forms a second angle A2 with the tread centerline 14, which is between 30° and 60°. The first secondary groove extension line 30 originates from one end of the first secondary groove 3 (the seventh intersection point D7, as shown below). Figure 15 As shown) through the other end (the fifth intersection point D5, as shown) Figure 15 As shown), a straight line extending to the centerline 14 of the tread. The first secondary groove 3 passes through the first bisector 171, the second bisector 172, the third bisector 173, and the fourth bisector 174. The second secondary groove 4, in the width direction X, crosses the area of ​​the first tread 15 or the second tread 16, respectively, between 60% and 90%, with an optimal crossing area of ​​75%. The area of ​​the second secondary groove 4 as a percentage of the area of ​​the first tread 15 or the second tread 16 is between 2% and 4%, with an optimal percentage of 4%. The area of ​​the first secondary groove 3 as a percentage of the total area of ​​the tread portion 11 is between 2% and 4%, with an optimal total area percentage of 2%. The second auxiliary groove 4's extension line 40 forms a third angle A3 with the tread centerline 14 between 40° and 55°. The extension line 40 is located at one end of the second auxiliary groove 4 (the twelfth intersection point D12, as shown). Figure 20 As shown) through the other end (the ninth intersection point D9, as shown) Figure 20 (as shown), and a straight line extending to the center line 14 of the tread. The second secondary groove extension line 40 passes through the third bisector 173 and the fourth bisector 174.

[0080] like Figure 4 and Figure 32As shown, the depth of the first secondary groove 3 is between 3mm and 6mm. The depth varies depending on the tire size; for example, for a 110 / 70-12 tire... Figure 11 As shown, the depth B4 of the fourth section where the first secondary groove 3 intersects with the first bisector 171 is 5.1 mm; the depth B5 of the fifth section where it intersects with the second bisector 172 is 4.8 mm; the depth B6 of the sixth section where it intersects with the third bisector 173 is 4.3 mm; and the depth B7 of the seventh section where it intersects with the fourth bisector 174 is 3.6 mm. (100 / 90-10 tire, such as...) Figure 12 As shown, the depth of the fourth section B4 of the first secondary groove 3 is 4.5mm, the depth of the fifth section B5 is 4.3mm, the depth of the sixth section B6 is 3.8mm, and the depth of the seventh section B7 is 3.2mm. (This applies to a 120 / 70-15 tire.) Figure 13 As shown, the depth of the fourth section B4 of the first secondary trench 3 is 4.8 mm, the depth of the fifth section B5 is 4.8 mm, the depth of the sixth section B6 is 4.7 mm, and the depth of the seventh section B7 is 3.9 mm.

[0081] like Figure 11 As shown, the periphery of the first secondary groove 3 is formed by a fifth sidewall 31, a sixth sidewall 32, a seventh sidewall 33, and an eighth sidewall 34 connected sequentially. The radius C5 of the fifth rounded corner (R-angle) of the fifth sidewall 31 is between 126mm and 157mm; the radius C6 of the sixth rounded corner (R-angle) of the sixth sidewall 32 is between 98mm and 120mm; the radius C7 of the seventh rounded corner (R-angle) of the seventh sidewall 33 is between 36mm and 45mm; and the radius C8 of the eighth rounded corner (R-angle) of the eighth sidewall 34 is between 36mm and 45mm. The rounded corner radii differ for different tire sizes; for example, for a 110 / 70-12 tire... Figure 11 As shown, the fifth fillet radius C5 of the first secondary groove 3 is 140mm, the sixth fillet radius C6 is 108.5mm, the seventh fillet radius C7 is 40mm, and the eighth fillet radius C8 is 8mm. (100 / 90-10 tire, as shown) Figure 12 As shown, the fifth fillet radius C5 of the first secondary groove 3 is 126mm, the sixth fillet radius C6 is 98mm, the seventh fillet radius C7 is 36mm, and the eighth fillet radius C8 is 7mm. (This refers to a 120 / 70-15 tire.) Figure 13 As shown, the fifth fillet radius C5 of the first sub-groove 3 is 157mm, the sixth fillet radius C6 is 120mm, the seventh fillet radius C7 is 45mm, and the eighth fillet radius C8 is 9mm.

[0082] like Figure 14The fifth intersection D5 connecting the fifth side wall 31 and the sixth side wall 32 has a ninth distance E9 from the center line 14 of 9.6mm to 11.9mm, and a tenth distance E10 from the second dividing line Y2 of 79.8mm to 100.2mm. The sixth intersection D6 connecting the sixth side wall 32 and the seventh side wall 33 has an eleventh distance E11 from the center line 14 of 48.2mm to 59.6mm, and a twelfth distance E12 from the second dividing line Y2 of 42mm to 52.4mm. The seventh intersection D7 connecting the seventh side wall 33 and the eighth side wall 34 has a thirteenth distance E13 from the center line 14 of 61.1mm to 75.7mm, and a fourteenth distance E14 from the second dividing line Y2 of 29mm to 35.1mm. The eighth intersection D8 connecting the eighth side wall 34 and the fifth side wall 31 has a fifteenth distance E15 from the center line 14 of 57.2mm to 70.7mm, and a sixteenth distance E16 from the second dividing line Y2 of 41mm to 52.4mm. The distances of different specifications of tires are different, for example, for a 110 / 70-12 tire, as shown in Figure 14 The ninth distance E9 of the first secondary groove 3 is 9.6mm, the tenth distance E10 is 90.8mm, the eleventh distance E11 is 53.9mm, the twelfth distance E12 is 46.4mm, the thirteenth distance E13 is 68.9mm, the fourteenth distance E14 is 29mm, the fifteenth distance E15 is 64mm, and the sixteenth distance E16 is 45.3mm for a 100 / 90-10 tire, as shown in Figure 15 The ninth distance E9 of the first secondary groove 3 is 9.9mm, the tenth distance E10 is 81.1mm, the eleventh distance E11 is 48.2mm, the twelfth distance E12 is 42.7mm, the thirteenth distance E13 is 61.1mm, the fourteenth distance E14 is 29mm, the fifteenth distance E15 is 57.2mm, and the sixteenth distance E16 is 41.7mm for a 120 / 70-15 tire, as shown in Figure 16 The ninth distance E9 of the first secondary groove 3 is 11.9mm, the tenth distance E10 is 100.2mm, the eleventh distance E11 is 59.6mm, the twelfth distance E12 is 52.4mm, the thirteenth distance E13 is 75.7mm, the fourteenth distance E14 is 35.1mm, the fifteenth distance E15 is 70.7mm, and the sixteenth distance E16 is 51.2mm.

[0083] As Figure 4 andFigure 33 As shown, the depth of the second groove 4 is between 2mm and 5mm. The depth varies depending on the tire size; for example, for a 110 / 70-12 tire... Figure 17 As shown, the depth B8 of the eighth section where the second secondary groove 4 intersects the third bisector 173 is 3.6 mm, and the depth B9 of the ninth section where the second secondary groove 4 intersects the fourth bisector 174 is 2.7 mm. (100 / 90-10 tire, as shown) Figure 18 As shown, the depth B8 of the eighth section of the second secondary groove 4 is 3.8 mm, and the depth B9 of the ninth section is 3.2 mm. (120 / 70-15 tire, as shown) Figure 19 As shown, the depth B8 of the eighth section of the second secondary trench 4 is 4.7 mm, and the depth B9 of the ninth section is 3.9 mm.

[0084] like Figure 17 As shown, the perimeter of the second secondary groove 4 is formed by a ninth sidewall 41, a tenth sidewall 42, an eleventh sidewall 43, a twelfth sidewall 44, and a thirteenth sidewall 45 connected sequentially. The radius C9 of the ninth rounded corner (R-angle) of the ninth sidewall 41 is between 71mm and 90mm; the radius C10 of the tenth rounded corner (R-angle) of the tenth sidewall 42 is between 81mm and 100mm; the radius C11 of the eleventh rounded corner (R-angle) of the eleventh sidewall 43 is between 6mm and 8mm; the radius C12 of the twelfth rounded corner (R-angle) of the twelfth sidewall 44 is between 18mm and 22mm; and the radius C13 of the thirteenth rounded corner (R-angle) of the thirteenth sidewall 45 is between 19mm and 80mm. The rounded corner radii differ for different tire sizes; for example, for a 110 / 70-12 tire... Figure 17 As shown, the radius of the ninth fillet C9 of the second auxiliary groove 4 is 80mm, the radius of the tenth fillet C10 is 90mm, the radius of the eleventh fillet C11 is 7mm, the radius of the twelfth fillet C12 is 20mm, and the radius of the thirteenth fillet C13 is 80mm. (100 / 90-10 tire, as shown) Figure 18 As shown, the radius of the ninth fillet C9 of the second auxiliary groove 4 is 71mm, the radius of the tenth fillet C10 is 81mm, the radius of the eleventh fillet C11 is 6.6mm, the radius of the twelfth fillet C12 is 18mm, and the radius of the thirteenth fillet C13 is 19mm. (This refers to a 120 / 70-15 tire.) Figure 19 As shown, the radius of the ninth rounded corner C9 of the second sub-groove 4 is 90mm, the radius of the tenth rounded corner C10 is 100mm, the radius of the eleventh rounded corner C11 is 8mm, the radius of the twelfth rounded corner C12 is 22mm, and the radius of the thirteenth rounded corner C13 is 22mm.

[0085] like Figure 20The ninth intersection D9 is connected to a ninth edge wall 41 and a tenth edge wall 42. The seventeenth distance E17 between the ninth intersection D9 and the center line 14 of the tread is between 28.7mm and 36.6mm, and the eighteenth distance E18 between the ninth intersection D9 and the second dividing line Y2 is between 85mm and 104.8mm. The tenth intersection D10 is connected to the tenth edge wall 42 and an eleventh edge wall 43. The nineteenth distance E19 between the tenth intersection D10 and the center line 14 of the tread is between 46.8mm and 57.9mm, and the twentieth distance E20 between the tenth intersection D10 and the second dividing line Y2 is between 70.9mm and 87mm. The eleventh intersection D11 is connected to the eleventh edge wall 43 and a twelfth edge wall 44. The twenty-first distance E21 between the eleventh intersection D11 and the center line 14 of the tread is between 46.7mm and 57.9mm, and the twenty-second distance E22 between the eleventh intersection D11 and the second dividing line Y2 is between 66.9mm and 82.2mm. The twelfth intersection D12 is connected to the twelfth edge wall 44 and a thirteenth edge wall 45. The twenty-third distance E23 between the twelfth intersection D12 and the center line 14 of the tread is between 53.6mm and 66.4mm, and the twenty-fourth distance E24 between the twelfth intersection D12 and the second dividing line Y2 is between 61.3mm and 75.1mm. The thirteenth intersection D13 is connected to the thirteenth edge wall 45 and the ninth edge wall 41. The twenty-fifth distance E25 between the thirteenth intersection D13 and the center line 14 of the tread is between 51.4mm and 63.6mm, and the twenty-sixth distance E26 between the thirteenth intersection D13 and the second dividing line Y2 is between 73mm and 89.6mm. The distances for different sizes of tires are different. For example, for a 110 / 70-12 tire, as shown in the figure, the seventeenth distance E17 of the second sub-groove 4 is 28.7mm, the eighteenth distance E18 is 94.5mm, the nineteenth distance E19 is 52.4mm, the twentieth distance E20 is 77mm, the twenty-first distance E21 is 52.2mm, the twenty-second distance E22 is 72.7mm, the twenty-third distance E23 is 61mm, the twenty-fourth distance E24 is 65.7mm, the twenty-fifth distance E25 is 57.5mm, and the twenty-sixth distance E26 is 79.3mm. Figure 20 The ninth intersection D9 is connected to a ninth edge wall 41 and a tenth edge wall 42. The seventeenth distance E17 between the ninth intersection D9 and the center line 14 of the tread is between 28.7mm and 36.6mm, and the eighteenth distance E18 between the ninth intersection D9 and the second dividing line Y2 is between 85mm and 104.8mm. The tenth intersection D10 is connected to the tenth edge wall 42 and an eleventh edge wall 43. The nineteenth distance E19 between the tenth intersection D10 and the center line 14 of the tread is between 46.8mm and 57.9mm, and the twentieth distance E20 between the tenth intersection D10 and the second dividing line Y2 is between 70.9mm and 87mm. The eleventh intersection D11 is connected to the eleventh edge wall 43 and a twelfth edge wall 44. The twenty-first distance E21 between the eleventh intersection D11 and the center line 14 of the tread is between 46.7mm and 57.9mm, and the twenty-second distance E22 between the eleventh intersection D11 and the second dividing line Y2 is between 66.9mm and 82.2mm. The twelfth intersection D12 is connected to the twelfth edge wall 44 and a thirteenth edge wall 45. The twenty-third distance E23 between the twelfth intersection D12 and the center line 14 of the tread is between 53.6mm and 66.4mm, and the twenty-fourth distance E24 between the twelfth intersection D12 and the second dividing line Y2 is between 61.3mm and 75.1mm. The thirteenth intersection D13 is connected to the thirteenth edge wall 45 and the ninth edge wall 41. The twenty-fifth distance E25 between the thirteenth intersection D13 and the center line 14 of the tread is between 51.4mm and 63.6mm, and the twenty-sixth distance E26 between the thirteenth intersection D13 and the second dividing line Y2 is between 73mm and 89.6mm. The distances for different sizes of tires are different. For example, for a 110 / 70-12 tire, as shown in the figure, the seventeenth distance E17 of the second sub-groove 4 is 28.7mm, the eighteenth distance E18 is 94.5mm, the nineteenth distance E19 is 52.4mm, the twentieth distance E20 is 77mm, the twenty-first distance E21 is 52.2mm, the twenty-second distance E22 is 72.7mm, the twenty-third distance E23 is 61mm, the twenty-fourth distance E24 is 65.7mm, the twenty-fifth distance E25 is 57.5mm, and the twenty-sixth distance E26 is 79.3mm. Figure 21As shown, the seventeenth distance E17 of the second sub-groove 4 is 30.5 mm, the eighteenth distance E18 is 85 mm, the nineteenth distance E19 is 46.8 mm, the twentieth distance E20 is 70.9 mm, the twenty-first distance E21 is 46.7 mm, the twenty-second distance E22 is 66.9 mm, the twenty-third distance E23 is 53.6 mm, the twenty-fourth distance E24 is 61.3 mm, the twenty-fifth distance E25 is 51.4 mm, and the twenty-sixth distance E26 is 73 mm.120 / 70-15 tire, as Figure 22 As shown, the seventeenth distance E17 of the second sub-groove 4 is 36.6 mm, the eighteenth distance E18 is 104.8 mm, the nineteenth distance E19 is 42.4 mm, the twentieth distance E20 is 87 mm, the twenty-first distance E21 is 57.9 mm, the twenty-second distance E22 is 66.9 mm, the twenty-third distance E23 is 53.6 mm, the twenty-fourth distance E24 is 61.3 mm, the twenty-fifth distance E25 is 51.4 mm, and the twenty-sixth distance E26 is 73 mm.

[0086] Shallow groove unit 5, as Figure 3 , Figure 23 and Figure 24As shown, a plurality of the shallow groove units 5 are arranged on the tread portion 11 in a mirror image manner in the width direction X with the tread center line 14 as a reference. The groove width of the shallow groove unit 5 gradually increases from the tread center line 14 towards the first side edge 12 and the second side edge 13, thereby effectively breaking the water film and improving the wet ground contact. The shallow groove unit 5 is arranged across the first tread 15 or the second tread 16 in the width direction X, and the cross-sectional area of the shallow groove unit 5 is between 60% and 90% of the cross-sectional area of the first tread 15 or the second tread 16, and the optimal cross-sectional area is 75%. The area of the shallow groove unit 5 accounts for 2% to 4% of the area of the first tread 15 or the second tread 16, and the optimal ratio is 4%. Each group of shallow groove units 5 is connected to the first sub-groove 3 and the second sub-groove 4. The shallow groove unit 5 includes at least two first shallow grooves 51, a second shallow groove 52, a third shallow groove 53, and a fourth shallow groove 54. The area of the first shallow groove 51 accounts for 0.5% of the total area of the tread portion 11. A first shallow groove extension line 510 of the first shallow groove 51 has a fourth angle A4 with the tread center line 14, and the fourth angle A4 is between 40° and 70°. The first shallow groove extension line 510 extends from a first end point 51A of the same side wall (fourteenth side wall 511) of the first shallow groove 51 to a second end point 51B to a straight line between the tread center line 14. The first shallow groove 51 passes through the fourth bisector 174. The area of the second shallow groove 52 accounts for 0.5% of the total area of the tread portion 11. A second shallow groove extension line 520 of the second shallow groove 52 has a fifth angle A5 with the tread center line 14, and the fifth angle A5 is between 40° and 55°. The second shallow groove extension line 520 extends from a third end point 52A of the same side wall (seventeenth side wall 521) of the second shallow groove 52 to a fourth end point 52B to a straight line between the tread center line 14. The second shallow groove 52 passes through the third bisector 173. The area of the third shallow groove 53 accounts for 0.5% of the total area of the tread portion 11. A third shallow groove extension line 530 of the third shallow groove 53 has a sixth angle A6 with the tread center line 14, and the sixth angle A6 is between 30° and 35°. The third shallow groove extension line 530 extends from a fifth end point 53A of the same side wall (twentieth side wall 531) of the third shallow groove 53 to a sixth end point 53B to a straight line between the tread center line 14. The third shallow groove 53 passes through the first bisector 171. The area of the fourth shallow groove 54 accounts for 0.5% of the total area of the tread portion 11. A fourth shallow groove extension line 540 of the fourth shallow groove 54 has a seventh angle A7 with the tread center line 14, and the seventh angle A7 is between 30° and 40°. The fourth shallow groove extension line 540 extends from a seventh end point 54A of the same side wall (twenty-third side wall 541) of the fourth shallow groove 54 to an eighth end point 54B to a straight line between the tread center line 14.The fourth shallow groove 54 is located between the first bisector 171 and the second bisector 172.

[0087] As shown in Figure 23 , Figures 34 to 37 , the depths of the first shallow groove 51, the second shallow groove 52, the third shallow groove 53 and the fourth shallow groove 54 are between 1mm and 1.5mm. The depths of different specifications of tires are not the same. For example, for a 110 / 70-12 tire, the depths of the first shallow groove 51, the second shallow groove 52, the third shallow groove 53 and the fourth shallow groove 54 are all 1.5mm. For a 100 / 90-10 tire, the depths of the first shallow groove 51, the second shallow groove 52, the third shallow groove 53 and the fourth shallow groove 54 are all 1.5mm. For a 120 / 70-15 tire, the depths of the first shallow groove 51, the second shallow groove 52, the third shallow groove 53 and the fourth shallow groove 54 are all 1mm.

[0088] As shown in Figure 24 , the periphery of the first shallow groove 51 is sequentially connected by a fourteenth side wall 511, a fifteenth side wall 512 and a sixteenth side wall 513. The fourteenth side wall 511 has a fourteenth fillet (R corner) radius C14 between 13mm and 16mm, the fifteenth side wall 512 has a fifteenth fillet (R corner) radius C15 between 18mm and 22mm, and the sixteenth side wall 513 has a sixteenth fillet (R corner) radius C16 between 5mm and 6mm. The fillet radii of different specifications of tires are not the same. For example, for a 110 / 70-12 tire, as shown in Figure 24 , the fourteenth fillet radius C14 is 14.5mm, the fifteenth fillet radius C15 is 20mm, and the sixteenth fillet radius C16 is 5mm. For a 100 / 90-10 tire, as shown in Figure 25 , the fourteenth fillet radius C14 is 13mm, the fifteenth fillet radius C15 is 18mm, and the sixteenth fillet radius C16 is 5mm. For a 120 / 70-15 tire, as shown in Figure 26 , the fourteenth fillet radius C14 is 16mm, the fifteenth fillet radius C15 is 22mm, and the sixteenth fillet radius C16 is 6mm.

[0089] As shown in Figure 24As shown, the periphery of the second shallow groove 52 is formed by a seventeenth sidewall 521, an eighteenth sidewall 522, and a nineteenth sidewall 523 connected in sequence. The eighteenth sidewall 522 and the nineteenth sidewall 523 are connected at a fourteenth intersection point D14. The plurality of first dividing lines Y1 on the first tread 15 pass through the fourteenth intersection point D14 of the corresponding second shallow groove 52 on the second tread 16 (as shown in Figure 39), and the plurality of second dividing lines Y2 on the second tread 16 pass through the fourteenth intersection point D14 of the corresponding second shallow groove 52 on the first tread 15. The radius C17 of the seventeenth fillet (R-angle) of the seventeenth sidewall 521 is between 97mm and 120mm; the radius C18 of the eighteenth fillet (R-angle) of the eighteenth sidewall 522 is between 27mm and 33mm; and the radius C19 of the nineteenth fillet (R-angle) of the nineteenth sidewall 523 is between 9mm and 11mm. The fillet radii differ for different tire sizes; for example, for a 110 / 70-12 tire... Figure 24 As shown, the radius of the seventeenth fillet C17 is 108.5mm, the radius of the eighteenth fillet C18 is 30mm, and the radius of the nineteenth fillet C19 is 10mm. (This refers to a 100 / 90-10 tire.) Figure 25 As shown, the radius of the seventeenth fillet C17 is 97mm, the radius of the eighteenth fillet C18 is 27mm, and the radius of the nineteenth fillet C19 is 9mm. (This refers to a 120 / 70-15 tire.) Figure 26 As shown, the radius of the seventeenth fillet C17 is 120mm, the radius of the eighteenth fillet C18 is 33mm, and the radius of the nineteenth fillet C19 is 11mm.

[0090] like Figure 24 As shown, the periphery of the third shallow groove 53 is formed by sequentially connecting a twentieth sidewall 531, a twenty-eleventh sidewall 532, and a twenty-second sidewall 533. The radius C20 of the twentieth rounded corner (R-angle) of the twentieth sidewall 531 is between 108.5 mm and 120 mm; the radius C21 of the twenty-first rounded corner (R-angle) of the twenty-first sidewall 532 is between 64 mm and 77 mm; and the radius C22 of the twenty-second rounded corner (R-angle) of the twenty-second sidewall 533 is between 9 mm and 11 mm. The rounded corner radii differ for different tire sizes; for example, for a 110 / 70-12 tire... Figure 24 As shown, the twentieth corner radius C20 is 108.5mm, the twenty-first corner radius C21 is 69mm, and the twenty-second corner radius C22 is 10mm. (This refers to a 100 / 90-10 tire.) Figure 25As shown, the twentieth corner radius C20 is 100mm, the twenty-first corner radius C21 is 64mm, and the twenty-second corner radius C22 is 9mm. (This refers to a 120 / 70-15 tire.) Figure 26 As shown, the twentieth rounded corner radius C20 is 120mm, the twenty-first rounded corner radius C21 is 77mm, and the twenty-second rounded corner radius C22 is 11mm.

[0091] like Figure 24 As shown, the perimeter of the fourth shallow trench 54 is formed by a twenty-third sidewall 541, a twenty-fourth sidewall 542, a twenty-fifth sidewall 543, a twenty-sixth sidewall 544, and a twenty-seventh sidewall 545 connected sequentially. The radius C23 of the twenty-third rounded corner (R-angle) of the twenty-third sidewall 541 is between 13mm and 15mm, the radius C24 of the twenty-fourth rounded corner (R-angle) of the twenty-fourth sidewall 542 is between 19mm and 22mm, the radius C25 of the twenty-fifth rounded corner (R-angle) of the twenty-fifth sidewall 543 is between 2.5mm and 6mm, the radius C26 of the twenty-sixth rounded corner (R-angle) of the twenty-sixth sidewall 544 is between 10mm and 12mm, and the radius C27 of the twenty-seventh rounded corner (R-angle) of the twenty-seventh sidewall 545 is between 6mm and 11mm. Different tire sizes have different corner radii; for example, a 110 / 70-12 tire... Figure 24 As shown, the radius of the 23rd fillet C23 is 14mm, the radius of the 24th fillet C24 is 20mm, the radius of the 25th fillet C25 is 2.5mm, the radius of the 26th fillet C26 is 10.5mm, and the radius of the 27th fillet C27 is 6mm. (This applies to 100 / 90-10 tires.) Figure 25 As shown, the radius of the twenty-third fillet C23 is 13mm, the radius of the twenty-fourth fillet C24 is 19mm, the radius of the twenty-fifth fillet C25 is 2mm, the radius of the twenty-sixth fillet C26 is 10mm, and the radius of the twenty-seventh fillet C27 is 6mm. (This refers to a 120 / 70-15 tire.) Figure 26 As shown, the radius of the twenty-third rounded corner C23 is 15mm, the radius of the twenty-fourth rounded corner C24 is 22mm, the radius of the twenty-fifth rounded corner C25 is 2.5mm, the radius of the twenty-sixth rounded corner C26 is 10.5mm, and the radius of the twenty-seventh rounded corner C27 is 6mm.

[0092] Fine line unit 6, such as Figure 3 and Figure 27As shown, with the tread centerline 14 as a reference, multiple arrays of the fine groove units 6 are continuously arranged in a mirror-like manner on the tread portion 11 in the width direction X, thereby effectively giving the tire a sense of speed. The fine groove units 6, in the width direction X, respectively span the area of ​​the first tread 15 or the second tread 16, ranging from 60% to 90%, with an optimal spanning area of ​​75%. Each set of fine groove units 6 connects the main groove unit 2, the first secondary groove 3, and the second secondary groove 4. Each fine groove unit 6 includes at least one first fine groove 61, one second fine groove 62, and one third fine groove 63. The first tread extension line 610 of the first tread 61 forms an eighth angle A8 with the tread centerline 14, which is between 25° and 50°. The first tread extension line 610 is a straight line extending from a ninth endpoint 61A at one end of the first tread 61 through a tenth endpoint 61B at the other end to the tread centerline 14. The first tread 61 passes through the first bisector 171, the second bisector 172, the third bisector 173, and the fourth bisector 174. The second tread extension line 620 of the second tread 62 forms a ninth angle A9 with the tread centerline 14, which is between 20° and 50°. The second tread extension line 620 is a straight line extending from the ninth endpoint 61A at one end of the second tread 62 through an eleventh endpoint 62A at the other end to the tread centerline 14. The second sipe 62 passes through the second bisector 172, the third bisector 173, and the fourth bisector 174. A third sipe extension 630 of the third sipe 63 forms a tenth angle A10 with the tread centerline 14, between 60° and 75°. This third sipe extension 630 is a straight line extending from a twelfth endpoint 63A at one end of the third sipe 63 through a tenth endpoint 61B at the other end to the tread centerline 14. The third sipe 63 passes through the first bisector 171, the second bisector 172, the third bisector 173, and the fourth bisector 174.

[0093] like Figure 27 , Figure 28 and Figure 38 As shown, the depth and width of the first fine sipe 61, the second fine sipe 62, and the third fine sipe 63 are all 0.5 mm. The first fine sipe 61 connects the second fine sipe 62 and the third fine sipe 63. Furthermore, the radius C28 of the twenty-eighth rounded corner (R-angle) of the first fine sipe 61 is between 149 mm and 170 mm, the radius C29 of the twenty-ninth rounded corner (R-angle) of the second fine sipe 62 is between 126 mm and 145 mm, and the radius C30 of the thirtieth rounded corner (R-angle) of the third fine sipe 63 is between 117 mm and 135 mm. The rounded corner radii differ for different tire sizes; for example, for a 110 / 70-12 tire...Figure 28 As shown, the twenty-eighth round corner radius C28 is 156 mm, the twenty-ninth round corner radius C29 is 130 mm, and the thirtieth round corner radius C30 is 120 mm. The 100 / 90-10 tire, as shown in FIG. 1, has a tread width of 100 mm, a tire width of 90 mm, and a tire diameter of 200 mm. Figure 29 As shown, the twenty-eighth round corner radius C28 is 149 mm, the twenty-ninth round corner radius C29 is 126 mm, and the thirtieth round corner radius C30 is 117 mm. The 120 / 70-15 tire, as shown in FIG. 2, has a tread width of 120 mm, a tire width of 70 mm, and a tire diameter of 150 mm. Figure 30 As shown, the twenty-eighth round corner radius C28 is 170 mm, the twenty-ninth round corner radius C29 is 145 mm, and the thirtieth round corner radius C30 is 135 mm.

[0094] The main groove unit 2, the first secondary groove 3, and the second secondary groove 4 form a claw mark shape, which improves the stability of the ground contact during driving. In particular, the shallow groove unit 5 and the fine line unit 6 connected to the claw mark groove further exhibit the effect of breaking the water film during the drainage process. Thus, the main groove unit 2, the first secondary groove 3, and the second secondary groove 4 form a neat claw mark groove, a progressive pattern design, and a gradually widening groove width, which can achieve rapid drainage and the effect of breaking the water film.

[0095] Therefore, the angle range of the main groove unit 2, the first secondary groove 3, and the second secondary groove 4 with respect to the center line 14 of the tire body 1 can be between 30° and 60°. Depending on the profile shape of the tire body 1, the angle of the main groove unit 2, the first secondary groove 3, and the second secondary groove 4 can be changed to meet the performance of the vehicle at various inclination angles and improve the performance on wet ground.

[0096] The tire of the present application is tested and evaluated in combination with B, P, and M tires on the market. The test items include the first-stage dry ground handling test, the second-stage wet ground handling test, and the third-stage wet ground braking distance test. The test results are shown in Table 1, Table 2, and Table 3, respectively.

[0097] ;

[0098] ;

[0099] ;

[0100] The main groove unit of the present application has a land ratio between 2% and 4% (between 4% and 8% for the first tread 15 or the second tread 16 respectively), the first secondary groove 3 has a land ratio between 2% and 4% (between 4% and 8% for the first tread 15 or the second tread 16 respectively), the second secondary groove 4 has a land ratio between 1% and 2% (between 2% and 4% for the first tread 15 or the second tread 16 respectively). The best land ratio design is verified by the way of hand-carved tire into wet test track, which can improve the wet grip by 20%, improve the handling performance by 20%, and shorten the stopping distance by 3.2 meters compared with the M brand tire.

[0101] Through the evaluation of the above-mentioned actual test results, the tire of the present application is superior to various tires on the market in various test items, so the present application can indeed achieve the effects of increasing the tire drainage and the wet ground contact.

[0102] From the above description of the embodiments, the operation, use and effects of the present application can be fully understood, and the above-described embodiments are only preferred embodiments of the present application, and should not limit the scope of the present application. Any simple equivalent changes and modifications made in accordance with the claims and the content of the present application should be within the scope of the present application.

Claims

1. A tire with improved wet grip, comprising: a tire body having a circumferential direction and a width direction, and a tread portion disposed on the tire body, the tread portion having a first side edge and a second side edge, and a tread centerline defined in the center of the tread portion, the tread centerline dividing the tread portion into a first tread portion and a second tread portion in the width direction; and at least one main groove unit, the main groove unit being symmetrically arranged on the first tread portion and the second tread portion in the width direction, the main groove unit having an area ratio of 4% to 8% with respect to the area of the first tread portion or the second tread portion, the main groove unit having an area ratio of 2% to 4% with respect to the total area of the tread portion, the main groove unit having a main groove extension line and a first included angle between the main groove extension line and the tread centerline, the first included angle being 50° to 55°, the main groove unit having a depth of 2 mm to 5 mm, and the main groove unit having a circumferential edge formed by a first side wall, a second side wall, a third side wall, and a fourth side wall connected in sequence, the first side wall having a first fillet radius of 75 mm to 94 mm, the second side wall having a second fillet radius of 60 mm to 75 mm, and the third side wall having a third fillet radius of 7 mm to 10 mm. ​ ​ At least one pair of groove units is arranged on the tread portion in a mirror symmetry in the width direction with respect to the center line of the tread, and the pair of groove units is adjacent to the main groove unit. The pair of groove units includes a first groove and a second groove. The first groove is across the area of the first tread or the second tread in the width direction, and the proportion of the area of the first groove to the area of the first tread or the second tread is between 4% and 8%. The proportion of the area of the first groove to the total area of the tread portion is between 2% and 4%. The first groove extension line of the first groove and the second angle of the center line of the tread are between 30° and 60°. The depth of the first groove is between 3mm and 6mm. The circumference of the first groove is sequentially connected by a fifth edge wall, a sixth edge wall, a seventh edge wall, and an eighth edge wall. The fifth corner radius of the fifth edge wall is between 126mm and 157mm. The sixth corner radius of the sixth edge wall is between 98mm and 120mm. The seventh corner radius of the seventh edge wall is between 36mm and 45mm. The eighth corner radius of the eighth edge wall is between 36mm and 45mm. The second groove is across the area of the first tread or the second tread in the width direction, and the proportion of the area of the second groove to the area of the first tread or the second tread is between 2% and 4%. The proportion of the area of the second groove to the total area of the tread portion is between 1% and 2%. The second groove extension line of the second groove and the third angle of the center line of the tread are between 40° and 55°. The depth of the second groove is between 2mm and 5mm. The circumference of the second groove is sequentially connected by a ninth edge wall, a tenth edge wall, an eleventh edge wall, a twelfth edge wall, and a thirteenth edge wall. The ninth corner radius of the ninth edge wall is between 71mm and 90mm. The tenth corner radius of the tenth edge wall is between 81mm and 100mm. The eleventh corner radius of the eleventh edge wall is between 6mm and 8mm. The twelfth corner radius of the twelfth edge wall is between 18mm and 22mm. The thirteenth corner radius of the thirteenth edge wall is between 19mm and 80mm.

2. Tire with improved wet grip according to claim 1, characterized in that: The area of the main groove unit across the first tread or the second tread is 75%, the proportion of the area of the main groove unit to the area of the first tread or the second tread is 8%, and the proportion of the area of the main groove unit to the total area of the tread portion is 4%.

3. The tire of claim 1 having improved wet grip, wherein: The first and second tread surfaces are divided into five equal parts by four equal division lines, and the eight equal division lines are defined as a first equal division line, a second equal division line, a third equal division line and a fourth equal division line from the center line of the tread toward the first side edge and the second side edge in sequence. A first cross-sectional depth of the main groove unit intersecting the second equal division line is 4.3 mm or 4.8 mm, a second cross-sectional depth intersecting the third equal division line is 3.6 mm, 3.8 mm or 4.7 mm, and a third cross-sectional depth intersecting the fourth equal division line is 2.7 mm, 3.2 mm or 3.9 mm.

4. The tire of claim 1 having improved wet grip, wherein: The first, second and third radii of the rounded corners are 83.5 mm, 75 mm or 94 mm, 66 mm, 60 mm or 75 mm, and 8 mm, 7 mm or 10 mm, respectively.

5. The tire of claim 3, wherein: A first intersection point of the first and second side walls, a first distance from the first intersection point to the center line of the tread is between 20.2 mm and 24.8 mm, and a second distance from the first intersection point to a separation line is between 49.5 mm and 51.6 mm. A second intersection point of the second and third side walls, a third distance from the second intersection point to the center line of the tread is between 42.5 mm and 47.5 mm, and a fourth distance from the second intersection point to the separation line is between 12.5 mm and 16.5 mm. A third intersection point of the third and fourth side walls, a fifth distance from the third intersection point to the center line of the tread is between 49.8 mm and 63.4 mm, and a sixth distance from the third intersection point to the separation line is between 10.1 mm and 12.7 mm. A fourth intersection point of the fourth and first side walls, a seventh distance from the fourth intersection point to the center line of the tread is between 56.8 mm and 70.7 mm, and an eighth distance from the fourth intersection point to the separation line is between 12.6 mm and 15.4 mm. The separation line is parallel to the width direction and perpendicular to the first, second, third and fourth equal division lines.

6. The tire of claim 5 having improved wet grip, wherein: The first, second, third, fourth, fifth, sixth, seventh and eighth distances are 20.5 mm, 20.2 mm or 24.8 mm, 49.5 mm or 51.6 mm, 47.5 mm or 42.5 mm, 13.6 mm or 12.5 mm, 63.4 mm, 11.2 mm or 10.3 mm, 70.7 mm, and 13.6 mm, 12.6 mm or 15.4 mm, respectively.

7. The tire of claim 1 having improved wet grip, wherein: The first sub-groove has a fourth cross-sectional depth of 5.1 mm, 4.5 mm, or 4.8 mm at a fourth intersection with the first dividing line, a fifth cross-sectional depth of 4.3 mm or 4.8 mm at a fifth intersection with the second dividing line, a sixth cross-sectional depth of 4.3 mm, 3.8 mm, or 4.7 mm at a sixth intersection with the third dividing line, and a seventh cross-sectional depth of 3.6 mm, 3.2 mm, or 3.9 mm at a seventh intersection with the fourth dividing line.

8. The tire of claim 1 having improved wet grip, wherein: The first sub-groove has a fourth cross-sectional depth of 5.1 mm, 4.5 mm, or 4.8 mm at a fourth intersection with the first dividing line, a fifth cross-sectional depth of 4.3 mm or 4.8 mm at a fifth intersection with the second dividing line, a sixth cross-sectional depth of 4.3 mm, 3.8 mm, or 4.7 mm at a sixth intersection with the third dividing line, and a seventh cross-sectional depth of 3.6 mm, 3.2 mm, or 3.9 mm at a seventh intersection with the fourth dividing line.

9. The tire of claim 1 having improved wet grip, wherein: The fifth edge wall and the sixth edge wall are connected to each other at a fifth intersection, the fifth intersection has a ninth distance from the centerline of the tread of between 9.6 mm and 11.9 mm, and a tenth distance from a dividing line of between 79.8 mm and 100.2 mm, the sixth edge wall and the seventh edge wall are connected to each other at a sixth intersection, the sixth intersection has an eleventh distance from the centerline of the tread of between 48.2 mm and 59.6 mm, and a twelfth distance from the dividing line of between 42 mm and 52.4 mm, the seventh edge wall and the eighth edge wall are connected to each other at a seventh intersection, the seventh intersection has a thirteenth distance from the centerline of the tread of between 61.1 mm and 75.7 mm, and a fourteenth distance from the dividing line of between 29 mm and 35.1 mm, the eighth edge wall and the fifth edge wall are connected to each other at an eighth intersection, the eighth intersection has a fifteenth distance from the centerline of the tread of between 57.2 mm and 70.7 mm, and a sixteenth distance from the dividing line of between 41 mm and 52.4 mm, the dividing line is parallel to the width direction and perpendicular to the first dividing line, the second dividing line, the third dividing line, and the fourth dividing line.

10. The tire of claim 8, wherein: The fifth edge wall and the sixth edge wall are connected to each other at a fifth intersection, the fifth intersection has a ninth distance from the centerline of the tread of between 9.6 mm and 11.9 mm, and a tenth distance from a dividing line of between 79.8 mm and 100.2 mm, the sixth edge wall and the seventh edge wall are connected to each other at a sixth intersection, the sixth intersection has an eleventh distance from the centerline of the tread of between 48.2 mm and 59.6 mm, and a twelfth distance from the dividing line of between 42 mm and 52.4 mm, the seventh edge wall and the eighth edge wall are connected to each other at a seventh intersection, the seventh intersection has a thirteenth distance from the centerline of the tread of between 61.1 mm and 75.7 mm, and a fourteenth distance from the dividing line of between 29 mm and 35.1 mm, the eighth edge wall and the fifth edge wall are connected to each other at an eighth intersection, the eighth intersection has a fifteenth distance from the centerline of the tread of between 57.2 mm and 70.7 mm, and a sixteenth distance from the dividing line of between 41 mm and 52.4 mm, the dividing line is parallel to the width direction and perpendicular to the first dividing line, the second dividing line, the third dividing line, and the fourth dividing line.

11. The tire of claim 10, wherein: The ninth distance of the first sub-groove is 9.6 mm, 9.9 mm or 11.9 mm, the tenth distance is 90.8 mm, 81.1 mm or 100.2 mm, the eleventh distance is 53.9 mm, 48.2 mm or 59.6 mm, the twelfth distance is 46.4 mm, 42.7 mm or 52.4 mm, the thirteenth distance is 68.9 mm, 61.1 mm or 75.7 mm, the fourteenth distance is 29 mm or 35.1 mm, the fifteenth distance is 64 mm, 57.2 mm or 70.7 mm, and the sixteenth distance is 45.3 mm, 41.7 mm or 51.2 mm.

12. The tire of claim 1 having improved wet grip, wherein: The first tread is divided into five equal parts by four equal lines, and the second tread is divided into five equal parts by four equal lines. Eight equal lines are defined as a first equal line, a second equal line, a third equal line and a fourth equal line from the center line of the tread to the first side edge and the second side edge in sequence. The eighth cross-sectional depth of the second sub-groove intersecting the third equal line is 3.6 mm, 3.8 mm or 4.7 mm, and the ninth cross-sectional depth of the second sub-groove intersecting the fourth equal line is 2.7 mm, 3.2 mm or 3.9 mm.

13. The tire of claim 1 having improved wet grip, wherein: The ninth fillet radius of the second sub-groove is 80 mm, the tenth fillet radius is 90 mm, the eleventh fillet radius is 7 mm, the twelfth fillet radius is 20 mm, 18 mm or 22 mm, and the thirteenth fillet radius is 80 mm, 19 mm or 22 mm.

14. The tire with improved wet grip as described in claim 12, characterized in that: A ninth intersection where the ninth side wall connects with the tenth side wall, a seventeenth distance from the tenth intersection to the centerline of the tread is between 28.7mm and 36.6mm, an eighteenth distance from the tenth intersection to a dividing line is between 85mm and 104.8mm, a tenth intersection where the tenth side wall connects with the eleventh side wall, a nineteenth distance from the tenth intersection to the centerline of the tread is between 46.8mm and 57.9mm, a twentieth distance from the tenth intersection to the dividing line is between 70.9mm and 87mm, an eleventh intersection where the eleventh side wall connects with the twelfth side wall, a twenty first distance from the eleventh intersection to the centerline of the tread is between 46.7mm and 57.9mm, a twenty second distance from the eleventh intersection to the dividing line is between 66.9mm and 82.2mm, a twelfth intersection where the twelfth side wall connects with the thirteenth side wall, a twenty third distance from the twelfth intersection to the centerline of the tread is between 53.6mm and 66.4mm, a twenty fourth distance from the twelfth intersection to the dividing line is between 61.3mm and 75.1mm, a thirteenth intersection where the thirteenth side wall connects with the ninth side wall, a twenty fifth distance from the thirteenth intersection to the centerline of the tread is between 51.4mm and 63.6mm, a twenty sixth distance from the thirteenth intersection to the dividing line is between 73mm and 89.6mm, the dividing line is parallel to the width direction, and perpendicular to the first, second, third and fourth bisectors.

15. The tire of claim 14 having improved wet grip, wherein: The seventeenth distance of the second sub-groove is 28.7mm, 30.5mm or 36.6mm, the eighteenth distance is 94.5mm, 85mm or 104.8mm, the nineteenth distance is 52.4mm or 46.8mm, the twentieth distance is 77mm, 70.9mm or 87mm, the twenty first distance is 52.2mm, 46.7mm or 57.9mm, the twenty second distance is 72.7mm or 66.9mm, the twenty third distance is 61mm or 53.6mm, the twenty fourth distance is 65.7mm or 61.3mm, the twenty fifth distance is 57.5mm or 51.4mm, and the twenty sixth distance is 79.3mm or 73mm.

16. Tyre with improved wet grip according to claim 5 or 10 or 14, characterized in that: There are at least one shallow groove unit, with the centerline of the tread as the reference, a plurality of the shallow groove units are arranged in mirror symmetry in the width direction on the tread portion, the area of the shallow groove unit is between 60% and 90% of the area of the first or second tread, the area of the shallow groove unit accounts for between 2% and 4% of the area of the first or second tread, and the shallow groove unit is connected to the first and second sub-grooves.

17. The tire of claim 16 having improved wet grip, wherein: The shallow groove unit includes two first shallow grooves, a second shallow groove, a third shallow groove, and a fourth shallow groove. A first shallow groove extension line of the first shallow groove forms a fourth angle with a tire center line, and the fourth angle is between 40° and 70°. A second shallow groove extension line of the second shallow groove forms a fifth angle with the tire center line, and the fifth angle is between 40° and 55°. A third shallow groove extension line of the third shallow groove forms a sixth angle with the tire center line, and the sixth angle is between 30° and 35°. A fourth shallow groove extension line of the fourth shallow groove forms a seventh angle with the tire center line, and the seventh angle is between 30° and 40°. The depths of the two first shallow grooves, the second shallow groove, the third shallow groove, and the fourth shallow groove are between 1 mm and 1.5 mm. The periphery of the first shallow groove is sequentially connected by a fourteenth edge wall, a fifteenth edge wall, and a sixteenth edge wall. A fourteenth fillet radius of the fourteenth edge wall is between 13 mm and 16 mm. A fifteenth fillet radius of the fifteenth edge wall is between 18 mm and 22 mm. A sixteenth fillet radius of the sixteenth edge wall is between 5 mm and 6 mm. The periphery of the second shallow groove is sequentially connected by a seventeenth edge wall, an eighteenth edge wall, and a nineteenth edge wall. A seventeenth fillet radius of the seventeenth edge wall is between 97 mm and 120 mm. An eighteenth fillet radius of the eighteenth edge wall is between 27 mm and 33 mm. A nineteenth fillet radius of the nineteenth edge wall is between 9 mm and 11 mm. The periphery of the third shallow groove is sequentially connected by a twentieth edge wall, a twenty-first edge wall, and a twenty-second edge wall. A twentieth fillet radius of the twentieth edge wall is between 108.5 mm and 120 mm. A twenty-first fillet radius of the twenty-first edge wall is between 64 mm and 77 mm. A twenty-second fillet radius of the twenty-second edge wall is between 9 mm and 11 mm. The periphery of the fourth shallow groove is sequentially connected by a twenty-third edge wall, a twenty-fourth edge wall, a twenty-fifth edge wall, a twenty-sixth edge wall, and a twenty-seventh edge wall. A twenty-third fillet radius of the twenty-third edge wall is between 13 mm and 15 mm. A twenty-fourth fillet radius of the twenty-fourth edge wall is between 19 mm and 22 mm. A twenty-fifth fillet radius of the twenty-fifth edge wall is between 2 mm and 3 mm.5mm to 6mm, a second twenty-sixth fillet radius of the second twenty-sixth side wall is between 10mm to 12mm, a second twenty-seventh fillet radius of the second twenty-seventh side wall is between 6mm to 11mm, a groove width of the sipe is gradually widened from the centerline of the tread toward the first side edge and the second side edge, respectively, the eighteenth side wall and the nineteenth side wall are connected to a fourteenth intersection point, the dividing line comprises a plurality of first dividing lines and a plurality of second dividing lines, the plurality of first dividing lines on the first tread respectively pass through the fourteenth intersection points of the corresponding second sipes on the second tread, and the plurality of second dividing lines on the second tread respectively pass through the fourteenth intersection points of the corresponding second sipes on the first tread.

18. The tire of claim 1 having improved wet grip, wherein: At least one sipe unit is arranged on the tread portion, and the sipe unit is arranged on the tread portion in a mirror symmetry in the width direction with the tread center line as a reference. The sipe unit is arranged on the tread portion in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first tread or the second tread in the width direction, and the sipe unit is arranged on the first 19. The tire of claim 18 having improved wet grip, wherein: ​ 20. The tire of claim 1 having improved wet traction, wherein: ​

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