A drift tire with excellent grip and handling performance and a manufacturing method thereof

Abstract

The present invention discloses a drift tire with excellent grip and handling performance and a manufacturing method thereof. The tread, on a cross section of the tire meridian, has a profile from the intersection of the tire equatorial plane and the tread profile to the tread end of the shoulder portion, which is sequentially connected by four arcs and a shoulder arc, and the four arcs are sequentially connected and finally connected to the shoulder arc. The saturation of the tread pattern on the outer side of the present invention is greater than that on the inner side, and the pattern grooves are chamfered. The tire structure is STEEL with steel wire reinforcement on the outer side of the apex rubber + aramid reinforcement on the outer side of the 1# tire body on the inner side of the apex rubber. The present invention adds high-tech materials such as aramid and uses them in conjunction with steel cords to increase the hardness of the tire wall while reducing its own weight, thereby improving the support of the tire. The profile design of the four arcs + shoulder arc can obtain uniform ground contact pressure and a wider net contact surface, which is beneficial to optimizing the ground contact footprint and ground contact pressure distribution of the tire. The tire of the present invention has excellent grip and handling performance, and high breaking strength.

Description

Technical Field

[0001] The invention belongs to the field of rubber technology, and specifically relates to the contour design, pattern design, construction design and manufacturing method of a drift tire, and in particular to a drift tire with excellent grip and handling performance and a manufacturing method thereof. Background Art

[0002] Drift tires are derived from ordinary UHP series tires. The difference between them and ordinary UHP series products is that drift tires require the tire tread to have stronger grip, and the tire body must have sufficient rigidity under low air pressure conditions to ensure the tire's handling.

[0003] The D1 Drift Grand Prix, like F1 and WRC, is one of the few world-class professional events certified by the FIA ​​(International Automobile Federation). 2016 is a milestone for the drifting sport in China, because the world's top drifting event, Japan's D1 GRAND PRIX, which has been developed in Japan for 16 years and is known as the "F1" of the drifting world, has officially come to China.

[0004] The "D1 GRAND PRIX Drifting Grand Prix China Cup" is a localized competition of the D1 Grand Prix, a series of competitions among contestants from seven countries including China, Japan, the United States, Russia, Thailand, Malaysia, and Singapore. The D1 GRAND PRIX Drifting Grand Prix China Cup has officially entered China, which is of epoch-making significance for China's drifting events. It has a positive impact on the development of China's automobile sports culture, especially drifting culture.

[0005] The influence of the "D1 GRAND PRIX Drifting Grand Prix China Cup" is increasing day by day. The event is mostly sponsored by many foreign tire manufacturers. In order to enhance the brand awareness of our company, we urgently need to research and develop drift tires to participate in drift competitions and expand the brand's influence through participation.

[0006] In terms of the competition system, the competition in China completely adopts the rules of D1 GRAND PRIX in Japan, which is divided into two competition modes: solo and chase. Finally, the judges and the electronic DOSS system will score.

[0007] Track Introduction: The track must have at least one set of S-curves that can be drifted continuously. The scoring interval can be seen clearly from the referee's seat. The scoring interval must be between the start and the end. The driver must drive the vehicle through the track at an overwhelming speed, large angle and clean drift. It is a competition of driver skills and a display of tire performance. The requirements for tires are strong grip and controllability.

[0008] The rules of the competition require tires: tires are made of rubber and are restricted to road tires sold in the market. Tire tread saturation = LAND / (LAND+SEA)*% = tread contact area / (tread contact area + tread groove area)*%. When not in use, it must meet ﹤78%. When not in use, tread grooves with a depth of less than 1.6mm will be considered as the contact part. The size parameters of tire specifications for all vehicles with a racing weight of 1000kg-1550Kg are as follows.

[0009]

[0010] Chinese patent CN201510467941.0 relates to an inflatable passenger car radial tire for optimizing wetland drainage performance, comprising a tread, wherein at least four circumferential main grooves extending in the circumferential direction of the tire are provided on the tread, and characterized in that the profile of the tread on the cross section of the tire meridian, from the intersection of the tire equatorial plane and the tread profile to the tread end of the shoulder, is divided into a first crown arc, a first main groove arc, a second crown arc, a second main groove arc and a shoulder arc in sequence by two circumferential main grooves, and the arc length a of the first crown arc, the arc length b of the first main groove arc, the arc length c of the second crown arc, the arc length d of the second main groove arc and the arc length e of the shoulder arc have a relationship of 1≤a / b≤1.1, 0.44≤b / c≤0.51, 1.86≤c / d≤3 and 0.26≤d / e≤0.28. The crown groove depth of the circumferential main groove at the crown portion is h1, and the shoulder groove depth of the circumferential main groove at the shoulder portion is h2, and the relationship between h1 and h2 is 1.33≤h1 / h2≤1.78. The h1:h2 is equal to 6:5, with a fluctuation of ±0.5. The a:b:c:d:e is equal to 21:20:42:18:67, with a fluctuation of ±0.5. The profile of the tread 30 from the intersection of the tire equatorial plane CL and the tread profile to the tread end P of the shoulder portion on the cross section of the tire meridian is divided into a first crown arc 30A, a first main groove arc 30B, a second crown arc 30C, a second main groove arc 30D and a shoulder arc 30E in sequence by the first main groove 41 and the second main groove 42. The arc length a of the first crown arc 30A, the arc length b of the first main groove arc 30B, the arc length c of the second crown arc 30C, the arc length d of the second main groove arc 30D and the arc length e of the shoulder arc 30E have a relationship of 1≤a / b≤1.1, 0.44≤b / c≤0.51, 1.86≤c / d≤3 and 0.26≤d / e≤0.28. Preferably, a:b:c:d:e is equal to 21:20:42:18:67, with a fluctuation of ±0.5. By changing the tread contour arc and limiting the functional relationship between a, b, c, d, e and h1, h2, the design of the tire tread contour shape is achieved, so as to improve the deformation of the tire when it contacts the ground and the drainage capacity of the tire during driving, optimize the wetland drainage performance of the tire, and improve the safety of driving in rainy days; however, in the current existing technology, some drift tire products only add STEEL steel wire reinforcement on the outside of the apex rubber, some only add STEEL steel wire reinforcement on the outside of the sidewall carcass, some add STEEL steel wire reinforcement on the outside of the apex rubber + add blended reinforcement on the outside of the carcass on the outside of the apex rubber, some have no reinforcement on the apex rubber and the sidewall, the tread groove does not adopt a chamfer design, and the carcass does not have sufficient rigidity to ensure the handling of the tire under low air pressure conditions. Summary of the invention

[0011] In view of this, in order to realize drifting tires, the tread of the tires is required to have stronger grip, so that the tire body has sufficient rigidity under low air pressure conditions to ensure the controllability of the tire. The embodiment of the present invention adopts the following technical solutions to achieve:

[0012] A drift tire with excellent grip and handling performance, comprising a tread, wherein the tread, on a cross section of the tire meridian, has a profile from the intersection of the tire equatorial plane and the tread profile to the tread end of the shoulder portion, which is sequentially connected by four arcs and a shoulder arc, namely, a first arc TW1, a second arc TW2, a third arc TW3, and a fourth arc TW4, wherein the four arcs are sequentially connected and finally connected to the shoulder arc;

[0013] The four radii corresponding to the four arcs are TR1, TR2, TR3, and TR4, and the arc lengths of the four arcs are L1, L2, L3, and L4 respectively. TRn is a shoulder arc, and TRn is inscribed with the fourth radius TR4 corresponding to the fourth arc and the upper sidewall arc radius Ru at the same time. The shoulder point is point P, and point P is the intersection of the fourth arc radius TR4 and the upper sidewall arc radius Ru. The arc length between the two shoulder points P of the tire is L, and the height from the intersection of the tire equatorial plane and the tread profile to the shoulder point P is h;

[0014] The tread curvature radius range:

[0015] 10>TR1 / NSW>6,4>TR2 / NSW>1.5, 2>TR3 / NSW>1.5, 1>TR4 / NSW>0.3, 35>TRn>20;

[0016] The tread arc length range:

[0017] 0.175>L1 / L>0.125, 0.175>L2 / L>0.125, 0.125>L3 / L>0.075, 0.125>L4 / L>0.075;

[0018] The range of "h" is: 0.055>h / L>0.030.

[0019] Furthermore, the excellent grip and handling drift tire of the present invention comprises a tread area, a sidewall area, and a bead area;

[0020] The tread area includes two layers of carcass cords, two layers of belt layers, a tightening belt layer cap strip, an airtight layer, a pair of sidewalls, and a tread; the sidewall area includes two layers of carcass cords, a bead apex rubber, a sidewall reinforcement layer, and an apex rubber reinforcement layer; and the bead area includes a bead core;

[0021] The structure of the drift tire specifically includes: two layers of carcass cords, two layers of belt layers, a pair of bead apex rubbers, a pair of sidewall reinforcement layers and a pair of apex rubber reinforcement layers, a tightening belt layer cap strip, an airtight layer, a pair of sidewalls, and a tread;

[0022] The apex rubber reinforcement layer is placed inside the second layer of carcass cords, and the sidewall area from left to right is the sidewall, the second layer of carcass cords, the turned-up part, the apex rubber reinforcement layer, the apex rubber strip, a pair of sidewall reinforcement layers, the main body, and the airtight layer.

[0023] Preferably, the carcass comprises a two-layer carcass structure, the one-layer carcass cord comprises a pair of main parts and a pair of turned-up parts, wherein the main part extends between the bead cores via the tread section and the sidewall section, the pair of turned-up parts each turn up around the bead core from the inner side of the tire axially to the outer side, and the two-layer carcass cord extends to the two bead cores via the tread section and the sidewall section, and the positive wrapping passes around the two bead cores;

[0024] The two belt layers are arranged radially above the two carcass cords in the tread section.

[0025] Preferably, the tread section 2 includes, from top to bottom, a tread 14, a tightening belt cap strip 11, two belt layers 7, two carcass cords 6c, a main body 6a, and an airtight layer 12;

[0026] The tread section 2 and the sidewall section 3 are transitionally connected via the sidewall 13;

[0027] Preferably, the pair of sidewall reinforcement layers are located outside the main part of a layer of carcass cord, with the center distance between the upper end points being US, extending along the sidewall interval to the tire bead core, and each of them is turned around the tire bead core to the outside, and the outer height, that is, the height of the turned-up end point from the tire bead reference line BL, is h2=13~18mm.

[0028] Preferably, the height of the pair of tire bead apex rubbers h3 = cross-sectional height H*0.25~0.35; the distance between the lower end point and the upper end of the tire bead core of a pair of apex rubber reinforcement layers is h1 = 5~8 mm, and the distance between the upper end point and the upper end point of the apex rubber is h4 = 10~15 mm. The airtight layer is located below the main body, and the pair of sidewalls are arranged on the outside of the second layer of carcass cords.

[0029] Preferably, the apex reinforcement layer on the outside of the bead apex is made of steel wire STEEL reinforcement material, and the reinforcement material is applied to the outside of the bead apex through equipment after the bead production process is completed;

[0030] The sidewall Aramid reinforcing material is pasted on a layer of carcass cords on the forming drum, and then the Aramid reinforcing material is pasted on a layer of carcass cords, and is reversed together with the layer of carcass cords through a forming bladder to achieve the structure required by the finished product.

[0031] Furthermore, the present invention also relates to a method for manufacturing a drift tire with excellent grip and handling performance, comprising the following steps:

[0032] 1) Production of finished bead A: The finished bead includes a bead core, a bead apex and an apex reinforcement layer. The conventional finished bead includes a bead core and a bead apex. A conventional finished bead is first produced. After the conventional finished bead is produced, the apex reinforcement layer is bonded by a bonding machine;

[0033] 2) Production of component B: the production of the airtight layer, the main part of a layer of carcass cords, and the sidewall reinforcement layer is completed on the forming drum DRUM. First, the airtight layer is pasted, and then the main part of a layer of carcass cords is pasted. Finally, on the main part of a layer of carcass cords, a pair of sidewall reinforcement layers are pasted according to the center distance US;

[0034] 3) Production of component C: After component B is produced, it is completed on the molding machine with component A by using booster capsule and reverse capsule;

[0035] 4) Production of component D: After completing component C, attach the second layer of carcass cord to the first layer of carcass cord, wrap it inward around the bead core through the forming bladder, and complete component D;

[0036] 5) Production of component E: On the forming drum, after the two layers of carcass cords are bonded, a pair of sidewalls are bonded to the two layers of carcass cords according to the US required by the construction standard, and are positively packed and compacted around the bead core by a forming bladder to complete component E;

[0037] 6) Production of component F: The composite belt layer completed by the two-stage drum includes a first belt layer, a second belt layer, and a tightening belt layer cap strip, which are combined with the tread and component E of a drum to complete the raw tire component F. Component F is vulcanized to obtain the drift tire.

[0038] Furthermore, the present invention also relates to a tread pattern of a drift tire with excellent grip and handling, wherein the tire tread pattern includes a pattern block area and a pattern groove, wherein the pattern groove includes a first pattern groove, a second pattern groove, and a third pattern groove arranged in sequence along the circumferential direction of the tire, so that the pattern block area forms a first pattern block area, a second pattern block area, a third pattern block area, and a fourth pattern block area;

[0039] The third pattern block area is arranged at the center of the tread, the first pattern block area is provided with transverse grooves and transverse grooves, the fourth block area is provided with transverse grooves and transverse grooves, and the longitudinal grooves intersect with the transverse grooves and transverse grooves;

[0040] The outer tread groove area is equal to the sum of the first tread groove area, the second tread groove area, the first tread block area transverse groove area, and the first tread block area transverse groove area;

[0041] The inner groove area is equal to the sum of the third groove area, the transverse groove area, the transverse groove area, and the longitudinal groove area of ​​the fourth pattern block area;

[0042] The outer pattern saturation is greater than the inner pattern saturation by 3%.

[0043] Preferably, the pattern grooves include a first pattern groove, a second pattern groove, a third pattern groove, a transverse groove, a transverse groove, a transverse groove, a transverse groove, and a longitudinal groove.

[0044] Preferably, the tire tread pattern adopts a pattern chamfer design, and the chamfer values ​​of the second and third pattern grooves of the longitudinal main pattern grooves are in the range of 2.0∽3.0;

[0045] The first groove of the longitudinal auxiliary groove, the first pattern block area is provided with transverse grooves and transverse grooves, the fourth pattern block area is provided with transverse grooves and transverse grooves, and the groove chamfer angle of the longitudinal groove pattern ranges from 1.8 to 2.0.

[0046] Preferably, the drift tire of the present invention is suitable for racing vehicles with a vehicle weight of 1200kg≤vehicle weight<1400kg, and the tire specification of the present invention is 285 / 35ZR18 101W XL.

[0047] Preferably, in order to meet the requirements of the competition for tires, the 285 / 35ZR18 specification is selected for design, the inflated section width B ranges from 278mm≤B≤295mm, and the inflated outer diameter D ranges from 651mm≤D≤663mm.

[0048] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0049] 1. The invention is applicable to competitive vehicles with a vehicle weight of 1200kg≤vehicle weight<1400kg, and the tire specification of the invention is 285 / 35ZR18101W XL. Under the premise of meeting the competition rules, the tire of the invention has excellent grip performance and handling performance.

[0050] 2. The present invention adopts a contour design of 4 arcs + shoulder arc to obtain uniform ground contact pressure and a wider net contact area, which is beneficial to optimizing the ground contact footprint and ground contact pressure distribution of the tire.

[0051] 3. The longitudinal main grooves, longitudinal auxiliary grooves, transverse grooves and pattern grooves of the tire of the present invention are all chamfered, so that during the use of the pattern grooves, as the pattern grooves become shallower, the pattern grooves gradually become narrower, so that the pattern saturation gradually increases, and the pattern contact area gradually increases, thereby increasing the grip and improving the controllability.

[0052] 4. The present invention meets the requirements of the competition for tire pattern saturation of ≤78%, ensures uniform wear of the tire during the competition, and ensures that the tire tread maintains the maximum contact area with the ground from beginning to end, thereby obtaining excellent grip. The pattern design adopts an asymmetric pattern, and the inner and outer sides adopt different saturations, and the saturation of the outer side is greater than that of the inner side. The pattern groove adopts a chamfer design, so that in the later stage of the competition, as the wear of the pattern groove decreases, the contact area gradually increases, and the grip tends to be stable.

[0053] 5. The tire of the present invention is designed and constructed by adding high-tech materials such as aramid (the main material of modern bulletproof vests) and steel cords, which not only strengthens the hardness of the tire wall but also reduces the dead weight and improves the support of the tire. The strength of aramid is 5 times that of steel of the same quality, but the density is only one-fifth of that of steel (the density of aramid is 1.44 grams per cubic centimeter, and the density of steel is 7.859 grams per cubic centimeter), and the breaking strength is nearly 1.5 times that of blended fibers.

[0054] 6. Lower deadweight and aspect ratio can improve wheel sensitivity and tire contact area, and harder tire wall can ensure less tire deformation during intense driving. It can enable the driver to obtain road information more directly and quickly, making the control feel more refined.

[0055] 7. The present invention adopts a special structure and uses a special frame material, which can ensure the handling of the tire when the tire inflation pressure is reduced, and can ensure the rigidity of the tire under low air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is the solution of the present invention: 4 arcs + shoulder arc design view; (a) is a half view, (b) is an enlarged view of (a);

[0057] Figure 2 The schemes are comparative schemes of the present invention; (a) is scheme 2, (b) is scheme 3, and (c) is scheme 4;

[0058] Figure 3 The finite element simulation results of the ground contact footprint of Scheme 1 of the present invention and the comparative scheme;

[0059] (a) is Scheme 1, (b) is Scheme 2, (c) is Scheme 3; (d) is Scheme 4;

[0060] Figure 4 for Figure 3 The bar chart of the rectangular ratio in the finite element simulation results of the ground footprint of the four schemes;

[0061] Figure 5 for Figure 3 The lateral average ground pressure curves of the four schemes;

[0062] Figure 6 This is a pattern view of the present invention;

[0063] Figure 7 The chamfered view of the pattern of the present invention; (a) is the a-a' cross-sectional view, and (b) is the b-b' cross-sectional view;

[0064] Figure 8 This is a technical effect diagram of wear comparison under the same environmental conditions when the pattern saturation outside is 3% greater than the inner side and the pattern saturation inside and outside are the same;

[0065] (a) (b) are the wear technology effect diagrams when the pattern saturation inside and outside are the same, (c) (d) are the wear technology effect diagrams when the pattern saturation outside is 3% greater than the inside;

[0066] Fig. 9 It is a cross-sectional structural diagram of the tire in the width direction of the present invention;

[0067] Fig.10 for Fig. 9 Partially enlarged view, (a) is a 1 / 2 view, (b) is a partial view of the bead apex rubber;

[0068] Fig.11 The following are brief steps of the method for manufacturing the drift tire with excellent grip and handling performance of the present invention;

[0069] Fig.12 The specific steps of the method for manufacturing the drift tire with excellent grip and handling performance of the present invention;

[0070] Fig.13 A cross-sectional view in the tire width direction of Scheme 1 of the present invention and other schemes: Scheme 2, Scheme 3, Scheme 4, and Scheme 5;

[0071] Fig.14 for Fig.13 Finite element simulation results of the ground footprint of schemes 1-5; (a) is scheme 1, (b) is scheme 2, (c) is scheme 3; (d) is scheme 4; (e) is scheme 5;

[0072] Fig.15 for Fig.14 The bar chart of the rectangular ratio in the finite element simulation results of the contact patch of the five schemes;

[0073] Fig.16 The forward driving route of the tire of the present invention during the race;

[0074] Among them, the names of the parts corresponding to the special marks are as follows:

[0075] One layer of carcass cord is 1#CARCASS (6a main part, 6b turn-up part), and two layers of carcass cord are 2#CARCASS (6c two layers of carcass cord). DETAILED DESCRIPTION

[0076] The present invention is described below in conjunction with the accompanying drawings and specific embodiments.

[0077] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0078] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0079] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0080] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. Such terms are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0081] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] like Figure 1 The present invention is shown as a drift tire with excellent grip and handling, including a tread, wherein the tread, on the cross section of the tire meridian, has a profile from the intersection of the tire equatorial plane and the tread profile to the tread end of the shoulder, which is sequentially connected by 4 arcs and a shoulder arc, namely, a first arc TW1, a second arc TW2, a third arc TW3, and a fourth arc TW4, wherein the 4 arcs are sequentially connected and finally connected with the shoulder arc, wherein the 4 radii corresponding to the 4 arcs are TR1, TR2, TR3, and TR4, and the arc lengths of the 4 arcs are L1, L2, L3, and L4, respectively; TRn is a shoulder arc, and TRn is inscribed with the 4th radius TR4 corresponding to the 4th arc and the upper sidewall arc radius Ru at the same time; point P is a shoulder point, which is the intersection of the two arcs of the 4th arc radius TR4 and the upper sidewall arc radius Ru; L is the arc length between the two shoulders P points of the tire; and h is the height from the intersection of the tire equatorial plane and the tread profile to the shoulder point P.

[0083] As a preferred embodiment of the present invention, the tread curvature radius range is:

[0084] 10>TR1 / NSW>6,

[0085] 4>TR2 / NSW>1.5,

[0086] 2>TR3 / NSW>1.5,

[0087] 1>TR4 / NSW>0.3,

[0088] 35>TRn>20.

[0089] If the four arc radii TR1, TR2, TR3, TR4 and the shoulder arc TRn are not within the above-mentioned value range, the tire contact shape, i.e. the rectangular ratio of the footprint, will not reach a reasonable range, which is not conducive to grip, and the pressure distribution uniformity is poor, which is not conducive to grip and handling.

[0090] As a preferred embodiment of the present invention, the tread arc length range is:

[0091] 0.175>L1 / L>0.125,

[0092] 0.175>L2 / L>0.125,

[0093] 0.125>L3 / L>0.075,

[0094] 0.125>L4 / L>0.075.

[0095] If the four arc lengths L1, L2, L3, and L4 are not within the above range, the tire's contact area cannot reach the maximum value, and the pressure distribution is uneven, which is not conducive to grip and handling;

[0096] As a preferred embodiment of the present invention, the range of "h" is:

[0097] 0.055>h / L>0.030

[0098] If h / L>0.055, the contact area of ​​the tire shoulder is reduced, resulting in poor grip.

[0099] If h / L﹤0.03, the contact patch will be butterfly-shaped and the pressure distribution will be uneven, which is not conducive to grip and handling.

[0100] By controlling the above-mentioned proportional relationships among TR1, TR2, TR3, TR4 and TRn, controlling the above-mentioned proportional relationships among L1, L2, L3, L4 and the above-mentioned proportional relationship among h, it is possible to ensure the maximum contact area of ​​the tire, optimize the rectangular ratio of the contact footprint and achieve the most uniform pressure distribution, thus enabling the tire to obtain the best grip and handling.

[0101] In order to describe the technical solutions and technical effects of the embodiments of the present invention in more detail, the following describes the technical solutions 1 and 2 of the present invention and other solutions. Figure 2 :(a) Scheme 2, (b) Scheme 3, (c) Scheme 4 are compared, and the tire profile design adopts different design schemes:

[0102] Solution 1: 4 arcs + shoulder arc, R1 = 8.70*NSW, R2 = 2.06*NSW, R3 = 1.27*NSW, R4 = 0.5*NSW, Rn = 25, within the range of 10>R1 / NSW>6, 4>R2 / NSW>1.5, 2>R3 / NSW>1.5, 1>R4 / NSW>0.3, 35>Rn>20, L1=0.158*L, L 2=0.158*NSW、L3=0.092*L、L4=0.092*L in the range of 0.175>L1 / L>0.125、0.175>L2 / L>0.125、0.125>L3 / L>0.075、0.125>L4 / L>0.075、h=0.042*L in the range of 0.055>h / L>0.030, see the table below for details;

[0103] Solution 2: 4 arcs + shoulder arc, R1 = 3.68*NSW, not in the range of 10>R1 / NSW>6, R3 = 0.78*NSW, not in the range of 2>R3 / NSW>1.5, L1 = 0.185*L, not in the range of 0.175>L1 / L>0.125, L2 = 0.185*L, not in the range of 0.175>L1 / L>0.125, L3 = 0.065*L, not in the range of 0.125>L3 / L>0.075, L4 = 0.065*L, not in the range of 0.125>L3 / L>0.075, other parameters are within the range, see the table below for details;

[0104] Solution 3: 3 arcs + shoulder arc, see the table below;

[0105] Solution 4: 2 arcs + shoulder arc solution. The parameters of the four solutions are summarized in the table below. Finite element simulation is performed on the four solutions to find the best solution for ground contact shape and pressure distribution.

[0106] Table 1 Parameter conditions of schemes 1-4

[0107]

[0108] Figure 3-4 The finite element simulation results and rectangular ratios of the ground footprint of the above four schemes are shown. From the simulation results, scheme 1 is closest to the target value of 1.25 and has the best result.

[0109] like Figure 5 From the pressure simulation results of the above four schemes, scheme 1 plus the black line is relatively smooth from shoulder to center and from center to shoulder, with the smallest pressure difference and uniform pressure, so the grip and controllability are the best.

[0110] In short, from the perspective of contact patch and pressure distribution, Solution 1: 4 arc segments + shoulder arc has the best effect.

[0111] like Figure 6 As shown, in order to obtain excellent grip and handling, this embodiment also discloses an asymmetric pattern with different saturations on the inner and outer sides of the tread pattern, and the pattern grooves are chamfered.

[0112] As a preferred embodiment of the present invention, an excellent grip and handling drift tire tread pattern is provided in the implementation of the present invention, wherein the tire tread pattern includes a pattern block area and a pattern groove, wherein the pattern groove includes a first pattern groove 2', a second pattern groove 4', and a third pattern groove 6' which are sequentially arranged along the circumference of the tire, so that the pattern block area forms a first pattern block area 1', a second pattern block area 3', a third pattern block area 5', and a fourth pattern block area 7'.

[0113] The third pattern block area 5' is arranged at the center of the tread, the first pattern block area 1' is provided with transverse grooves 8' and 9', the fourth block area is provided with transverse grooves 10' and 11', and the longitudinal grooves 12' intersect with the transverse grooves 10' and 11'.

[0114] Furthermore, abcd is the outer area, cdef is the inner area, the outer pattern groove area is equal to the sum of the first pattern groove 2' area, the second pattern groove 4' area, the transverse groove 8' area of ​​the first pattern block area, and the transverse groove 9' area of ​​the first pattern block area 1', and the outer pattern saturation = (abcd rectangular area-outer pattern groove area) / abcd rectangular area.

[0115] The inner groove area is equal to the sum of the third groove 6' area, the transverse groove 10', the transverse groove 11' and the longitudinal groove 12' area of ​​the fourth pattern block area 7'. The inner pattern saturation = (rectangular cdef area - inner groove area) / rectangular cdef area.

[0116] As a preferred embodiment of the present invention, the tread grooves are chamfered; the tread grooves include a first tread groove 2', a second tread groove 4', a third tread groove 6', a transverse groove 8', a transverse groove 9', a transverse groove 10', a transverse groove 11', and a longitudinal groove 12'.

[0117] like Figure 6 As shown, as a preferred embodiment of the present invention, the tire tread pattern adopts an asymmetric pattern design, the left side of the center line of the third pattern block area 5' and the second pattern groove 4', the second pattern block area 3', the first pattern groove 2', and the first pattern block area 1' are the outside, that is, the abcd rectangular area is the outside; the right side of the center of the third pattern block area 5' and the third pattern groove 6', the fourth pattern block area 7' are the inside, that is, the cdef rectangular area is the inside.

[0118] The pattern saturation range is: rectangular abef area, that is, the pattern saturation in the abef rectangular area is 70% ∽ 78%. Different saturation designs are used on the outside and inside, and the difference between the saturation of the outside pattern and the saturation of the inside pattern is ≥1.5% ∽ ≤5%, that is, the difference between the saturation of the abcd rectangular area and the saturation of the cdef rectangular area is 1.5% ∽ 5%.

[0119] As a preferred embodiment of the present invention, the saturation of the outer pattern is 3% greater than the saturation of the inner pattern;

[0120] like Figure 7As shown, the tire tread pattern adopts a pattern chamfer design, the chamfers of the second longitudinal main pattern groove 4' and the third pattern groove 6' are in the range of 2.0∽3.0 as shown in the a-a' section view, the longitudinal auxiliary groove is the first groove 2', the first pattern block area 1' is provided with transverse grooves 8' and transverse grooves 9', the fourth pattern block area 7' is provided with transverse grooves 10' and transverse grooves 11', and the longitudinal groove 12' pattern groove chamfer is in the range of 1.8∽2.0 as shown in the b-b' section view.

[0121] In order to ensure that the pattern is evenly worn during the competition, the saturation of the inner and outer sides of the pattern is designed to be different. The smooth tire is carved into designs with the same sea-to-land ratio and different sea-to-land ratios on the inner and outer sides for comparative testing.

[0122] In order to describe the technical scheme and technical effect of the embodiment of the present invention in more detail, the following is a comparison of the scheme in which the pattern saturation outside is 3% greater than the inner side and the pattern saturation inside and outside is the same under the same environmental conditions. The technical effect is as follows Figure 8 As shown, (a) and (b) are the wear test results when the pattern saturation inside and outside are the same. It can be seen from (a) and (b) that the outer side is more seriously worn than the inner side. (c) and (d) are the wear test results when the pattern saturation outside is 3% greater than that inside. It can be seen from (c) and (d) that the outer and inner sides are evenly worn.

[0123] According to the test results, the drift tire design should adopt different saturation designs for the inner and outer sides, and the saturation of the outer side is greater than that of the inner side. This can ensure that the tires wear evenly during the competition and have better grip and handling.

[0124] like Figure 9-14 As shown, drift tires are different from ordinary tires. In order to obtain greater grip, the contact area of ​​the tire must be increased. To increase the contact area, reducing the tire inflation pressure is a means. Reducing the tire inflation pressure will reduce the handling performance of the tire. How to ensure the handling of the tire when the tire inflation pressure is reduced? This requires ensuring the rigidity of the tire under low air pressure. For this purpose, a special structure and special skeleton materials must be used. In this embodiment, the outer side of the tire bead apex is reinforced with 1*3*0.25 steel cord (abbreviated as STEEL), and the sidewall is reinforced with Aramid1500D / 2 aramid material (abbreviated as Aramid). For specific structure, see Fig. 9 .

[0125] This embodiment provides a drift tire with excellent grip and handling properties, including a tread area 2, a sidewall area 3, and a bead area 4.

[0126] The tread interval 2 includes two layers of carcass cords 6, two layers of belt layers 7, a tightening belt layer cap strip 11, an airtight layer 12, a pair of sidewalls 13, and a tread 14. The sidewall interval 3 includes two layers of carcass cords 6, a bead apex rubber 8, a sidewall reinforcement layer 9, and an apex rubber reinforcement layer 10. The bead interval 4 includes a bead core 5.

[0127] The structure of the drift tire 1 specifically includes: two layers of carcass cords 6, two layers of belt layers 7, a pair of bead apex rubbers 8, a pair of sidewall reinforcement layers 9 and a pair of apex rubber reinforcement layers 10, a tightening belt cap strip 11, an airtight layer 12, a pair of sidewalls 13, and a tread 14;

[0128] The apex rubber reinforcement layer 10 is placed inside the second layer of carcass cord 6c, and the sidewall section 3 is composed of the sidewall 13, the second layer of carcass cord 6c, the turned-up part 6b, the apex rubber reinforcement layer 10, the apex rubber strip 8, a pair of sidewall reinforcement layers 9, the main body 6a, and the airtight layer 12 from left to right.

[0129] The carcass includes a two-layer carcass structure, the one-layer carcass cord includes a pair of main parts 6a and a pair of turned-up parts 6b, wherein the main part 6a extends between the bead cores 5 via the tread section 2 and the sidewall section 3, the pair of turned-up parts 6b each turn up around the bead core 5 from the inner side of the tire axial direction to the outer side, and the second-layer carcass cord 6c extends to the two bead cores 5 via the tread section 2 and the sidewall section 3, and is directly wrapped around the two bead cores 5;

[0130] The two belt layers 7 are provided above the two carcass cords 6 in the radial direction in the tread section 2 .

[0131] As a preferred embodiment of the present invention, the tread area 2 is composed of a tread 14, a tightening belt cap strip 11, two belt layers 7, two carcass cords 6c, a main body 6a, and an airtight layer 12 from top to bottom;

[0132] The tread section 2 and the sidewall section 3 are transitionally connected via the sidewall 13;

[0133] As a preferred embodiment of the present invention, the pair of sidewall reinforcing layers 9 are located outside the main body 6a of a layer of carcass cords, the center distance between the upper end points is US, and they extend along the sidewall interval 3 to the bead core 5, and each is turned around the bead core 5 to the outside, and the outer height, that is, the height of the turned-up end point from the bead reference line BL, is h2=13-18mm;

[0134] As a preferred embodiment of the present invention, the height of the pair of bead apex rubbers 8 is h3=H*0.25-0.35; (H is Fig. 9A pair of apex rubber reinforcement layers 10, the distance between the lower end point and the upper end of the bead core 5 is h1=5~8mm, and the distance between the upper end point and the upper end point of the apex rubber is h4=10~15mm. The airtight layer 12 is located below the main body 6a. In order to protect the second layer of carcass cords 6c, a pair of sidewalls 13 are arranged on the outside of the second layer of carcass cords 6c.

[0135] As a preferred embodiment of the present invention, the tire bead apex 8 of this embodiment is reinforced with STEEL on the outside and Aramid on the sidewall. The apex reinforcement layer 10 on the outside of the tire bead apex 8 adopts steel wire STEEL reinforcement material, and the reinforcement material can be applied to the outside of the tire bead apex 8 through equipment after the tire bead production process is completed.

[0136] The sidewall Aramid reinforcement material is on the forming drum. After a layer of carcass cord (1#CARCASS) is pasted, the Aramid reinforcement material is pasted on the 1#CARCASS and reversed through the forming bladder together with the 1#CARCASS to achieve the required structure of the finished product. Figure 11-12 .

[0137] like Fig.11 As shown, this embodiment also relates to a method for manufacturing a drift tire with excellent grip and handling, that is, a process for realizing a steel wire material on the outer side of an apex rubber and an aramid material on a sidewall reinforcement layer, comprising the following steps:

[0138] 1) Production of component 1: The production of the completed ring with the steel cord applied to the outside of the apex is the process of laminating the apex (i.e. the bead apex 8) with the steel bead (i.e. the bead core 5). After the apex and the steel bead are laminated together, the steel wire material is applied to the outside of the apex through the equipment, and the bottom of the steel cord is 5mm away from the top wire of the steel bead;

[0139] 2) Production of component 2: On the forming drum, after laminating 1#CARCASS, the aramid is attached to the 1# carcass at a distance of US from the center line, thus completing the component;

[0140] 3) Parts 1 and 2 are combined into one on the forming drum through forming reverse capsule and other tooling equipment.

[0141] like Fig.12 As shown, further, the realization process of the steel wire material on the outer side of the apex rubber and the aramid material on the sidewall reinforcement layer involved in this embodiment specifically includes the following steps:

[0142] 1) Production of finished bead A (5, 8, 10): The finished bead includes a bead core 5, a bead apex 8 and an apex reinforcing layer 10. The finished bead of a conventional product is composed of a bead core 5 and a bead apex 8. The finished bead is produced by first producing a conventional finished bead. After the conventional finished bead is produced, the apex reinforcing layer 10 is bonded by a bonding machine;

[0143] 2) Production of component B (6a, 9, 12): The production of the airtight layer 12, the main part 6a of a layer of carcass cords, and the sidewall reinforcement layer 9 is completed on the forming drum DRUM. First, the airtight layer 12 is attached, and then the main part 6a of a layer of carcass cords is attached. Finally, on the main part 6a of a layer of carcass cords, a pair of sidewall reinforcement layers 9 are attached according to the center distance US;

[0144] 3) Production of component C (5, 8, 10, 6a, 9, 12, 6b). After component B is produced, component C is completed on the molding machine with component A by boosting the capsule and reverse encapsulating the capsule;

[0145] 4) Production of component D (5, 8, 10, 6a, 9, 12, 6b, 6c): after component C is completed, a second layer of carcass cord 6c is attached to a layer of carcass cord, and a molding bladder is used to wrap the bead core 5 inwardly to complete component D;

[0146] 5) Production of component E (5, 8, 10, 6a, 9, 12, 6b, 6c, 13). This step is the last step of a drum forming process, which is the sidewall laminating process. On the drum, after the laminating of the second layer of carcass cords 6c is completed, a pair of sidewalls 13 are laminated on the second layer of carcass cords 6c according to the US required by the construction standard, and are positively packed and compacted around the bead core by a forming bladder.

[0147] 6) Components F (5, 8, 10, 6a, 9, 12, 6b, 6c, 13, 7a, 7b, 11, 14) are manufactured, and the composite belt layer completed by the two-stage drum includes a belt layer 7a, a second belt layer 7b, and a tightening belt layer cap strip 11, which are combined with a tread 14 and a composite component E of a drum to complete a green tire embryo F. The green tire embryo is obtained by vulcanization Fig. 9 Drift tires.

[0148] In order to describe the technical solutions and technical effects of the embodiments of the present invention in more detail, Figure 13-15 As shown, Fig.13 Different structural schemes are used for structural design. Through finite element simulation, different structural schemes are compared and analyzed to find the best design scheme. The following Table 2 shows the specific parameters of each scheme, among which:

[0149] Scheme 1 is the scheme of the present invention, and schemes 2 to 5 are existing schemes. The imprint and rigidity of the inventive scheme and the existing scheme are compared and analyzed through finite element simulation.

[0150] Table 2 Parameter conditions of schemes 1-5

[0151]

[0152] Through finite element simulation, the ground footprint of the invention scheme 1 has the best rectangular ratio of 1.41, so the structure of the invention scheme 1 is the best.

[0153] Table 3 Main index test results of schemes 1-5

[0154] Solution 1 Invention Option 2 Existing Option 3 is available Option 4 Existing Option 5 Existing Longitudinal rigidity 681.9 370.5 461.7 663.2 606.12 Lateral rigidity 337.26 247.39 291.7 350.81 293.77 Radial rigidity 476.01 341.91 339.96 443.75 390.18 Torsional rigidity 196.54 142.37 187.01 172.51 190.93

[0155] Through finite element simulation, it is found that the longitudinal, radial and torsional rigidity of Scheme 1 are higher than those of existing schemes. For racing tires, good torsional rigidity means good handling performance, high radial rigidity means more room for tire pressure adjustment, and good tire grip and handling. Therefore, judging from the simulation results, Scheme 1 is the best invention.

[0156] The following are the design ideas of the present invention:

[0157] Fig.16 This is the tire's forward driving route during the race: except for the beginning and end stages when the body is driving in a straight line, the rest of the time the body is drifting sideways. The above picture is in the clockwise direction. First, the left side of the driver is drifting clockwise, and then the right side of the driver is drifting counterclockwise. Through observation, the tire is always more severely worn on the outside. For this reason, the tire pattern is designed with different saturations on the inside and outside, and the saturation on the outside is higher than that on the inside. After comparative tests with different land-sea ratios on smooth tires, it was determined that the saturation on the outside should be greater than the saturation on the inside by 1.5%∽5% for the best effect.

[0158] The tire's longitudinal main grooves, longitudinal auxiliary grooves, transverse grooves, and pattern grooves all adopt a chamfer design. In this way, during the use of the pattern grooves, as the pattern grooves become shallower, the pattern grooves gradually become narrower, so that the pattern saturation gradually increases, and the pattern contact area gradually increases, thus increasing grip and improving handling.

[0159] Aramid (the main material of modern bulletproof vests) and other high-tech materials are added to the tire construction design in combination with steel cords, which not only strengthens the tire wall but also reduces its own weight and improves the tire's support. Aramid is five times stronger than steel of the same quality, but its density is only one-fifth of that of steel (the density of aramid is 1.44 grams per cubic centimeter, while the density of steel is 7.859 grams per cubic centimeter). Its breaking strength is nearly 1.5 times that of blended fibers.

[0160] Lower deadweight and aspect ratio can improve wheel sensitivity and tire contact area, and harder tire wall can ensure less tire deformation during intense driving. It can enable the driver to obtain road information more directly and quickly, making the control feel more refined.

[0161] The above embodiments are only used to illustrate and not to limit the technical solutions of the present invention. Any modification or partial replacement that does not deviate from the spirit of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A drift tire with excellent grip and handling, characterized by: The tread comprises a tread, wherein the tread, on the cross section of the tire meridian, has a profile from the intersection of the tire equatorial plane and the tread profile to the tread end of the shoulder portion, which is sequentially connected by four arcs and a shoulder arc, namely, a first arc TW1, a second arc TW2, a third arc TW3, and a fourth arc TW4, wherein the four arcs are sequentially connected and finally connected to the shoulder arc; The four radii corresponding to the four arcs are TR1, TR2, TR3, and TR4, and the arc lengths of the four arcs are L1, L2, L3, and L4 respectively. TRn is a shoulder arc, and TRn is inscribed with the fourth radius TR4 corresponding to the fourth arc and the upper sidewall arc radius Ru at the same time. The shoulder point is point P, and point P is the intersection of the fourth arc radius TR4 and the upper sidewall arc radius Ru. The arc length between the two shoulder points P of the tire is L, and the height from the intersection of the tire equatorial plane and the tread profile to the shoulder point P is h; The tread curvature radius range: 10>TR1 / NSW>6,4>TR2 / NSW>1.5, 2>TR3 / NSW>1.5, 1>TR4 / NSW>0.3, 35>TRn>20; NSW is the nominal section width of the tire specification; The tread arc length range: 0.175>L1 / L>0.125, 0.175>L2 / L>0.125, 0.125>L3 / L>0.075, 0.125>L4 / L>0.075; The range of "h" is: 0.055>h / L>0.030; the drift tire with excellent grip and handling performance includes a tread area (2), a sidewall area (3), and a bead area (4); The tread section (2) comprises two carcass plies (6), two belt layers (7), a tightening belt cap strip (11), an airtight layer (12), a pair of sidewalls (13), and a tread (14); the sidewall section (3) comprises two carcass plies (6), a bead apex rubber (8), a pair of sidewall reinforcement layers (9), and an apex rubber reinforcement layer (10); and the bead section (4) comprises a bead core (5); The structure of the drift tire (1) specifically comprises: two carcass plies (6), two belt layers (7), a pair of bead apex rubbers (8), a pair of sidewall reinforcement layers (9) and a pair of apex rubber reinforcement layers (10), a tightening belt cap strip (11), an airtight layer (12), a pair of sidewalls (13), and a tread (14); The apex rubber reinforcement layer (10) is placed on the inner side of the second layer of carcass cord (6c), and the sidewall section (3) is composed of the sidewall (13), the second layer of carcass cord (6c), the turned-up portion (6b), the apex rubber reinforcement layer (10), the bead apex rubber (8), a pair of sidewall reinforcement layers (9), the main body (6a), and the airtight layer (12) from left to right; wherein the carcass comprises a two-layer carcass structure, a layer of carcass cord comprises a pair of main bodies (6a) and a pair of turned-up portions (6b), wherein the main body (6a) extends between the bead cores (5) via the tread section (2) and the sidewall section (3), and the pair of turned-up portions (6b) each turn up around the bead core (5) from the inner side of the tire axial direction to the outer side, and the second layer of carcass cord (6c) extends to the two bead cores (5) via the tread section (2) and the sidewall section (3), and directly wraps around the two bead cores (5); The two belt layers (7) are arranged radially above the two carcass ply layers (6) in the tread area (2); The tread area (2) comprises, from top to bottom, a tread (14), a tightening belt cap strip (11), two belt layers (7), two carcass cords (6c), a main body (6a), and an airtight layer (12); The tread section (2) and the sidewall section (3) are transitionally connected via the sidewall (13); the pair of sidewall reinforcement layers (9) are located outside the main body (6a) of a layer of carcass cord, the center distance between the upper end points is US, and they extend along the sidewall section (3) to the bead core (5), and each wraps around the bead core (5) to the outside, and the outer wrap height, i.e., the height of the wrap end point from the bead reference line BL, is h2=13-18 mm; the height of the pair of bead apex rubbers (8) is h3=section height H*0.25-0.35; the pair of apex rubber reinforcement layers (10), the distance between the lower end point and the upper end of the tire bead core (5) is h1=5-8mm, the distance between the upper end point and the upper end point of the apex is h4=10-15mm, the airtight layer (12) is located below the main body (6a), and a pair of sidewalls (13) are arranged on the outside of the second layer of carcass cords (6c); the apex reinforcement layer (10) on the outside of the tire bead apex (8) is made of steel wire STEEL reinforcement material, and the reinforcement material is applied to the outside of the tire bead apex (8) through equipment after the tire bead production process is completed; After a layer of carcass cords are attached to the sidewall Aramid reinforcing material on the forming drum, the Aramid reinforcing material is attached to a layer of carcass cords and reversed together with the layer of carcass cords through a forming bladder to achieve the required structure of the finished product; the manufacturing method of the drift tire with excellent grip and handling performance comprises the following steps: 1) Production of finished bead A ((5), (8), (10)): The finished bead A ((5), (8), (10)) comprises a bead core (5), a bead apex rubber (8) and an apex rubber reinforcement layer (10). A conventional finished bead comprises a bead core (5) and a bead apex rubber (8). A conventional finished bead is first produced. After the conventional finished bead is produced, the apex rubber reinforcement layer (10) is bonded by a bonding machine; 2) Production of component B ((6a), (9), (12)): Production of an airtight layer (12), a main part of a layer of carcass cords (6a), and a pair of sidewall reinforcement layers (9) is completed on a forming drum DRUM, firstly pasting the airtight layer (12), then pasting a main part of a layer of carcass cords (6a), and finally pasting a pair of sidewall reinforcement layers (9) on the main part of a layer of carcass cords (6a) according to the center distance US; 3) Production of component C ((5), (8), (10), (6a), (9), (12), (6b)). After component B is produced, component C is completed on a molding machine with component A by using a booster capsule and an inverted capsule; 4) manufacturing of component D ((5), (8), (10), (6a), (9), (12), (6b), (6c)), after completing component C, laminating a second layer of carcass cord (6c) on a first layer of carcass cord, wrapping the carcass core (5) inwardly through a molding bladder, and completing component D; 5) The production of component E ((5), (8), (10), (6a), (9), (12), (6b), (6c), (13)) is completed on a forming drum. After the two layers of carcass cords (6c) are bonded, a pair of sidewalls (13) are bonded to the two layers of carcass cords (6c) according to the US molding requirements of the construction standard, and are positively packed and compacted around the tire bead core by a molding bladder to complete component E; 6) A raw tire component F ((5), (8), (10), (6a), (9), (12), (6b), (6c), (13), (7a), (7b), (11), (14)) is manufactured. The two-layer belt layer (7) completed by the two-stage drum includes a first belt layer (7a) and a second belt layer (7b), which are combined with a tightening belt layer cap strip (11), a tread (14) and a component E of a stage drum to complete the raw tire component F. The raw tire component F is vulcanized to obtain the drift tire. The tire tread pattern includes a pattern block area and a pattern groove. The pattern groove includes a first pattern groove (2'), a second pattern groove (4'), and a third pattern groove (6') arranged in sequence along the circumferential direction of the tire, so that the pattern block area forms a first pattern block area (1'), a second pattern block area (3'), a third pattern block area (5'), and a fourth pattern block area (7'); The third pattern block area (5') is arranged at the center of the tread, the first pattern block area (1') is provided with a transverse groove a (8') and a transverse groove b (9'), the fourth pattern block area is provided with a transverse groove c (10'), a transverse groove d (11'), and a longitudinal groove (12'), and the longitudinal groove (12') intersects with the transverse groove c (10') and the transverse groove d (11'); The outer tread groove area is equal to the sum of the area of ​​the first tread groove (2'), the area of ​​the second tread groove (4'), the area of ​​the transverse groove a (8') of the first tread block area, and the area of ​​the transverse groove b (9') of the first tread block area (1'); The inner groove area is equal to the sum of the area of ​​the third groove (6'), the transverse groove c (10'), the transverse groove d (11') and the longitudinal groove (12') of the fourth pattern block area (7'); The saturation of the outer pattern is greater than that of the inner pattern by 3%; the pattern grooves include a first pattern groove (2'), a second pattern groove (4'), a third pattern groove (6'), a transverse groove a (8'), a transverse groove b (9'), a transverse groove c (10'), a transverse groove d (11'), and a longitudinal groove (12'); the tire tread pattern adopts a pattern chamfer design, and the chamfer values ​​of the second pattern groove (4') and the third pattern groove (6') of the longitudinal main pattern groove range from 2.0 to 3.0; The first pattern groove (2') of the longitudinal auxiliary groove, the first pattern block area (1') is provided with transverse groove a (8'), transverse groove b (9'), the fourth pattern block area (7') is provided with transverse groove c (10'), transverse groove d (11'), and longitudinal groove (12'), and the groove chamfer value range of the pattern is 1.8∽2.0.

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