Tire

Abstract

The present invention provides a tire having a tread, the tread comprising: a crown pattern block; the first middle pattern block and the second middle pattern block are arranged on the two sides of the tire crown pattern block respectively; wherein the first middle pattern block is provided with a plurality of third grooves and a plurality of fourth grooves, the third grooves and the fourth grooves are sequentially and alternately arranged at intervals in the extending direction of the first middle pattern block, and the adjacent third grooves and fourth grooves are arranged in a central symmetry mode; an included angle theta is formed between the extending direction of each third groove and / or each fourth groove and the extending direction of the first middle pattern block, and theta is 62 + / -3 degrees. Through the arrangement, the rigidity of the outer side of the pattern is enhanced, the controllability of the tire is improved, and the pattern block toppling phenomenon in the running process of the tire is reduced, so that the high-frequency noise problem of the tire is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and in particular to a tire. Background Art

[0002] In recent years, my country's new energy vehicle market has shown a rapid growth trend. As people's awareness of environmental protection and energy conservation increases, the scale of the new energy vehicle market continues to expand, and new energy vehicle sales and market share continue to maintain rapid growth.

[0003] As the main component of new energy vehicles, tires have a great impact on the driving performance of the vehicle. Due to the large differences in the power components and transmission components between new energy vehicles and fuel vehicles, traditional fuel vehicle tires are not suitable for new energy vehicles. In terms of tire vibration and noise, they cannot meet the driving comfort requirements of new energy vehicles. Summary of the invention

[0004] The main purpose of the present invention is to provide a tire to solve the problem of low driving comfort caused by large vibration and high noise in contact with the road surface of tires of new energy vehicles in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a tire is provided, the tire has a tread, the tread includes: a crown pattern block; a first middle pattern block and a second middle pattern block, the first middle pattern block and the second middle pattern block are respectively arranged on both sides of the crown pattern block; wherein, a plurality of third grooves and a plurality of fourth grooves are arranged on the first middle pattern block, the plurality of third grooves and the plurality of fourth grooves are arranged alternately and at intervals in the extension direction of the first middle pattern block, and adjacent third grooves and fourth grooves are arranged in a centrally symmetrical manner; an angle θ is formed between the extension direction of each third groove and / or each fourth groove and the extension direction of the first middle pattern block, θ=62±3° tire.

[0006] Furthermore, the developed width of the running surface curve of the tire is TAW, the width of the first middle pattern block and the width of the second middle pattern block are respectively (12.4%±1%)TAW; and the width of the crown pattern block is (11.1%±1%)TAW.

[0007] Furthermore, the rolling surface curve unfolded width of the tire is TAW, and the nominal section width of the tire is SN; 0.78≤TAW / SN≤0.82.

[0008] Furthermore, the running surface curve unfolding width of the tire is TAW; the tread also includes: a first shoulder pattern block and a second shoulder pattern block, the first shoulder pattern block is arranged on the side of the first middle pattern block away from the crown pattern block, and the second shoulder pattern block is arranged on the side of the second middle pattern block away from the crown pattern block; a first longitudinal groove is arranged between the first middle pattern block and the first shoulder pattern block, and the width of the first longitudinal groove is (6.2%±0.3%)TAW; the second longitudinal groove is arranged between the crown pattern block and the first middle pattern block, and the width of the second longitudinal groove is (6.8%±0.3%)TAW; the third longitudinal groove is arranged between the crown pattern block and the second middle pattern block, and the width of the third longitudinal groove is (6.8%±0.3%)TAW; the fourth longitudinal groove is arranged between the second middle pattern block and the second shoulder pattern block, and the width of the fourth longitudinal groove is (6.2%±0.3%)TAW.

[0009] Furthermore, a plurality of first grooves are arranged on the crown pattern block, and the plurality of first grooves are arranged at intervals along the extension direction of the crown pattern block, and each first groove extends along the first direction, and an angle β is formed between the first direction and the extension direction of the crown pattern block, and the range of β is 45° to 55°; the first groove includes a first groove wall surface, and the first groove wall surface is an inclined surface, and the inclination angle c1 of the first groove wall surface is 43° to 47°.

[0010] Furthermore, a first reinforcing rib is provided in the first groove, and a height of the first reinforcing rib is h1, where h1=(0.25-0.3)h; a width of the first reinforcing rib is w4, and a maximum length of the first groove is w5, where w4=(0.35±0.1)w5.

[0011] Furthermore, a plurality of second grooves are provided on the crown block, and the plurality of first grooves and the plurality of second grooves are alternately and spaced apart in sequence along the extension direction of the crown block, the width of the second groove is w1, the width of the crown block is w, w1=(2 / 3)w; wherein each first groove is connected to the third longitudinal groove, each second groove is connected to the second longitudinal groove, and the second groove is located in the middle position of two adjacent first grooves.

[0012] Furthermore, the second groove extends along a predetermined arc trajectory; the second groove includes a second groove wall surface and a third groove wall surface that are arranged opposite to each other, the arc radius of the second groove wall surface is R1, the arc radius of the third groove wall surface is R3, and R3 = (R1+R2) / 2.

[0013] Furthermore, the second groove includes a first groove end connected to the second longitudinal groove, and a first section is provided on the crown pattern block, the first section is located at the first groove end and connected to the second groove wall; the maximum width of the first section is 3 mm.

[0014] Furthermore, a plurality of first grooves are arranged on the crown pattern block, and the plurality of first grooves are arranged at intervals along the extension direction of the crown pattern block. Each first groove extends along the first direction, and an angle β is formed between the first direction and the extension direction of the crown pattern block, and the range of β is 45° to 55°; 10°≤θ-β≤20°.

[0015] Furthermore, the third groove includes a first groove segment and a second groove segment connected to each other, the first groove segment is farther away from the crown pattern block than the second groove segment, the width of the first groove segment is w6, the width of the second groove segment is w7, and w6:w7=1:2.

[0016] Furthermore, the first groove segment includes a fourth groove wall surface, the fourth groove wall surface is a slope, and the inclination angle c2 of the fourth groove wall surface is 43°~47°; a third section surface is also provided on the first intermediate pattern block, and the third section surface is located at one end of the second groove segment away from the first groove segment and is connected to the fifth groove wall surface of the second groove segment.

[0017] Furthermore, a plurality of fifth grooves and a plurality of sixth grooves are arranged on the second middle pattern block, and the plurality of fifth grooves and the plurality of sixth grooves are arranged alternately and at intervals in the extension direction of the second middle pattern block; the two ends of the fifth groove are respectively connected to the third longitudinal groove and the fourth longitudinal groove; one end of the sixth groove is connected to the third longitudinal groove, and the other end is a closed end.

[0018] Further, the width of the second middle pattern block is w2, the width of the sixth groove is w3, and w3=(2 / 3)w2.

[0019] Furthermore, a plurality of seventh grooves are arranged on the first shoulder pattern block, and the plurality of seventh grooves are arranged at intervals along the extension direction of the first shoulder pattern block, and an angle α1 is formed between the extension direction of each seventh groove and the extension direction of the first shoulder pattern block, and α1=7°±2°; the seventh groove includes a third groove segment and a fourth groove segment which are connected to each other, the fourth groove segment is connected to the first longitudinal groove, and the width of the third groove segment is greater than the width of the fourth groove segment.

[0020] Furthermore, a plurality of eighth grooves and a plurality of ninth grooves are arranged on the second shoulder pattern block, and the plurality of eighth grooves and the plurality of ninth grooves are arranged alternately and at intervals in the extension direction of the second shoulder pattern block, and each eighth groove is connected to the fourth longitudinal groove; an angle α2 is formed between the extension direction of each eighth groove and the extension direction of the second shoulder pattern block, and α2=7°±2°.

[0021] Furthermore, the outer diameter of the tire is R, the first middle pattern block is provided with a third groove and a fourth groove arranged at intervals, and the second middle pattern block is provided with a fifth groove and a sixth groove arranged at intervals; the vertical distance between the third groove and the fifth groove is 2*w10, w10=(0.0079±0.0005)R.

[0022] Furthermore, the tire includes a first layer, a second layer and a third layer, which are connected in sequence from the circumferential surface of the tire to the axis line; the maximum thickness of the first layer is h2, the maximum thickness of the second layer is h3, and the maximum thickness of the third layer is h4, h2=h3, h4=1.5mm±0.5mm.

[0023] Furthermore, taking the axial direction of the tire as the width direction, the ratio among the width of the first middle pattern block, the width of the crown pattern block and the width of the second middle pattern block is 1.08:1:1.08.

[0024] The technical solution of the present invention is applied, and the tire has a tread, and the tread includes: a crown pattern block; a first middle pattern block and a second middle pattern block, and the first middle pattern block and the second middle pattern block are respectively arranged on both sides of the crown pattern block; wherein, a plurality of third grooves and a plurality of fourth grooves are arranged on the first middle pattern block, and the plurality of third grooves and the plurality of fourth grooves are arranged alternately and at intervals in the extension direction of the first middle pattern block, and the adjacent third grooves and the fourth grooves are arranged in a central symmetric manner; the extension direction of each third groove and / or each fourth groove has an angle θ with the extension direction of the first middle pattern block, θ=62±3°. Such an arrangement strengthens the rigidity of the outer side of the pattern, improves the controllability of the tire, reduces the phenomenon of the pattern block tipping during the driving process of the tire, and thus reduces the high-frequency noise problem of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A schematic structural diagram of a tread of a tire according to the present invention from a first viewing angle is shown;

[0027] Figure 2 A schematic structural diagram showing a second viewing angle of a tread of a tire according to the present invention;

[0028] Figure 3 A partial schematic diagram of a crown pattern block in the tread of a tire according to the present invention is shown;

[0029] Figure 4 shows a cross-sectional view of a first groove in the tread of a tire according to the present invention;

[0030] Figure 5 A partial schematic diagram of a first middle pattern block in the tread of a tire according to the present invention is shown;

[0031] Figure 6 A schematic structural diagram of a first section or a third section in the tread of a tire according to the present invention is shown;

[0032] Figure 7 A schematic cross-sectional view of a tire according to the present invention is shown.

[0033] The above drawings include the following reference numerals:

[0034] 100, tire; 110, first layer; 120, second layer; 130, third layer;

[0035] 210, crown pattern block; 211, first groove; 212, first groove wall surface; 213, first reinforcing rib; 214, second groove; 2140, second groove wall surface; 2141, third groove wall surface; 2143, first groove end; 215, first section;

[0036] 220, first middle pattern block; 221, third groove; 222, fourth groove; 2210, first groove section; 2211, second groove section; 2212, fourth groove wall surface; 223, third section surface; 2213, fifth groove wall surface;

[0037] 230, second middle pattern block; 231, fifth groove; 232, sixth groove;

[0038] 240, first shoulder pattern block; 241, seventh groove; 2410, third groove section; 2411, fourth groove section;

[0039] 250, second shoulder pattern block; 251, eighth groove; 252, ninth groove;

[0040] 310, first longitudinal groove; 320, second longitudinal groove; 330, third longitudinal groove; 340, fourth longitudinal groove. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Please refer to Figures 1 to 7The present invention provides a tire, including a tire 100, the tire 100 has a tread, the tread includes: a crown pattern block 210; a first middle pattern block 220 and a second middle pattern block 230, the first middle pattern block 220 and the second middle pattern block 230 are respectively arranged on both sides of the crown pattern block 210; wherein, a plurality of third grooves 221 and a plurality of fourth grooves 222 are arranged on the first middle pattern block 220, the plurality of third grooves 221 and the plurality of fourth grooves 222 are arranged alternately and at intervals in the extension direction of the first middle pattern block 220, and the adjacent third grooves 221 and the fourth grooves 222 are arranged in a central symmetric manner; the extension direction of each third groove 221 and / or each fourth groove 222 has an angle θ with the extension direction of the first middle pattern block 220, θ=62±3°. Such an arrangement further strengthens the rigidity of the outer side of the pattern and improves the handling performance.

[0043] According to the tire provided by the present application, the tire 100 has a tread, and the tread includes: a crown pattern block 210; a first middle pattern block 220 and a second middle pattern block 230, and the first middle pattern block 220 and the second middle pattern block 230 are respectively arranged on both sides of the crown pattern block 210; wherein, a plurality of third grooves 221 and a plurality of fourth grooves 222 are arranged on the first middle pattern block 220, and the plurality of third grooves 221 and the plurality of fourth grooves 222 are arranged alternately and at intervals in the extension direction of the first middle pattern block 220, and the adjacent third grooves 221 and the fourth grooves 222 are arranged in a central symmetric manner; the extension direction of each third groove 221 and / or each fourth groove 222 has an angle θ with the extension direction of the first middle pattern block 220, θ=62±3°. Such an arrangement strengthens the rigidity of the outer side of the pattern, improves the controllability of the tire, reduces the phenomenon of the pattern block tipping during the driving of the tire, and thus reduces the high-frequency noise problem of the tire.

[0044] Specifically, the running surface curve development width of the tire 100 is TAW, the width of the first middle pattern block 220 and the width of the second middle pattern block 230 are (12.4%±1%) TAW respectively; the width of the crown pattern block 210 is (11.1%±1%) TAW. It should be noted here that the running surface curve development width is the width of the contact surface of the tire 100 and the road surface. By setting the widths of the first middle pattern block 220, the crown pattern block 210 and the second middle pattern block 230 in a predetermined ratio with TAW, the overall ground contact stability of the pattern can be balanced to ensure the internal pressure balance of the tire ground contact surface.

[0045] Furthermore, the rolling surface curve development width of the tire 100 is TAW, and the nominal cross-sectional width of the tire 100 is SN; 0.78≤TAW / SN≤0.82.

[0046] The running surface curve of the tire 100 has an unfolded width of TAW; the tread further includes: a first shoulder pattern block 240 and a second shoulder pattern block 250, the first shoulder pattern block 240 is arranged on a side of the first middle pattern block 220 away from the crown pattern block 210, and the second shoulder pattern block 250 is arranged on a side of the second middle pattern block 230 away from the crown pattern block 210; a first longitudinal groove 310 is arranged between the first middle pattern block 220 and the first shoulder pattern block 240, and the width of the first longitudinal groove 310 is (6.2%±0.3%)TAW; the second The longitudinal groove 320 is arranged between the crown block 210 and the first middle block 220, and the width of the second longitudinal groove 320 is (6.8%±0.3%) TAW; the third longitudinal groove 330 is arranged between the crown block 210 and the second middle block 230, and the width of the third longitudinal groove 330 is (6.8%±0.3%) TAW; the fourth longitudinal groove 340 is arranged between the second middle block 230 and the second shoulder block 250, and the width of the fourth longitudinal groove 340 is (6.2%±0.3%) TAW. The width ratio of the blocks and the first longitudinal groove 310, the second longitudinal groove 320, the third longitudinal groove 330 and the fourth longitudinal groove 340 is set to comprehensively balance the dry and wet performance of the tire, ensure the rigidity of the middle block and the pressure distribution of the contact surface, ensure that the block is not easy to tip over when the tire is loaded, ensure the stability of the tire during driving, and reduce air flow vibration.

[0047] The effective contact area ratio of the tire is set at 67% to 70%. If the ratio is too large, its handling and wear resistance will be improved, but its wet performance and comfort will be greatly reduced; if the ratio is too small, its performance will not be well balanced.

[0048] A plurality of first grooves 211 are arranged on the crown pattern block 210, and the plurality of first grooves 211 are arranged at intervals along the extension direction of the crown pattern block 210, and each first groove 211 extends along the first direction, and there is an angle β between the first direction and the extension direction of the crown pattern block 210, and the range of β is 45° to 55°; the first groove 211 includes a first groove wall surface 212, and the first groove wall surface 212 is an inclined surface, and the inclination angle c1 of the first groove wall surface 212 is 43° to 47°. By setting the cutting angle c1, the rigidity of the middle pattern block of the tire can be ensured while increasing the wetland drainage of the tire. By setting the angle β, the quietness level of the tire can be ensured. If the angle is too large or too small, it will affect the driving stability and comfort of the tire.

[0049] A first reinforcing rib 213 is disposed in the first groove 211, and the height of the first reinforcing rib 213 is h1, h1=(0.25-0.3)h; the width of the first reinforcing rib 213 is w4, and the maximum length of the first groove 211 is w5, w4=(0.35±0.1)w5. The first reinforcing rib 213 can balance the rigidity of the crown pattern block 210, ensuring that the rigidity of the crown pattern block 210 of the tire is not too large, reducing the impact noise of the tire, and ensuring that the pattern block is not prone to tipping when the tire is running, reducing the high-frequency noise when the tire is running.

[0050] In the specific implementation process, a plurality of second grooves 214 are also arranged on the crown pattern block 210, and a plurality of first grooves 211 and a plurality of second grooves 214 are arranged alternately and at intervals in the extension direction of the crown pattern block 210, and the width of the second groove 214 is w1, and the width of the crown pattern block 210 is w, w1=(2 / 3)w; wherein, each first groove 211 is connected to the third longitudinal groove 330, and each second groove 214 is connected to the second longitudinal groove 320, and the second groove 214 is located in the middle of two adjacent first grooves 211. When the width of w1 is large, the rigidity of the crown pattern block 210 is reduced and the comfort is better, but the load-bearing capacity of the crown pattern block 210 is lost, and the handling of the tire is reduced; if the width of w1 is small, the load-bearing capacity and handling are improved, and its comfort is lost; this arrangement further comprehensively balances the rigidity of the tire pattern, improves the rigidity of the outer side of the tire, and improves the driving stability and handling performance of the tire.

[0051] The second groove 214 extends along a predetermined arc track; the second groove 214 includes a second groove wall surface 2140 and a third groove wall surface 2141 which are arranged opposite to each other, the arc radius of the second groove wall surface 2140 is R1, the third groove wall surface 2141 is an inclined surface, and the third groove wall surface 2141 includes a first edge contour line and a second edge contour line, the first edge contour line and the second edge contour line extend along an arc track respectively, the arc radius of the first edge contour line is R2, the arc radius of the second edge contour line is R3, and R3 = (R1 + R2) / 2. This arrangement not only ensures the aesthetics of the tire pattern, but also improves the ability of the tire to cut water film, improves the wet performance of the tire, ensures smooth airflow when the tire is driving, and improves driving comfort.

[0052] The second groove 214 includes a first groove end 2143 connected to the second longitudinal groove 320. The crown pattern block 210 is provided with a first cut surface 215, which is located at the first groove end 2143 and connected to the second groove wall surface 2140. The maximum width of the first cut surface 215 is 3 mm. The first cut surface 215 can improve the tire corner effect, improve the effect of the tire pattern block cutting the water film, and reduce the wear of the sharp corner position during the tire driving process.

[0053] A plurality of first grooves 211 are arranged on the crown pattern block 210, and the plurality of first grooves 211 are arranged at intervals along the extension direction of the crown pattern block 210. Each first groove 211 extends along the first direction, and an angle β is formed between the first direction and the extension direction of the crown pattern block 210, and the range of β is 45° to 55°; 10°≤θ-β≤20°. The rigidity of the first intermediate pattern block 220 is smaller than that of the crown pattern block 210, so as to ensure the driving comfort of the tire.

[0054] The third groove 221 includes a first groove section 2210 and a second groove section 2211 which are connected to each other. The first groove section 2210 is farther away from the crown pattern block 210 than the second groove section 2211. The width of the first groove section 2210 is w6, and the width of the second groove section 2211 is w7, and w6:w7=1:2. If the ratio becomes larger, the wet performance of the product is lost. If the ratio is smaller, the wet performance can be guaranteed, but the airflow storage in the groove is larger, the product noise is increased to a certain extent, and the product handling is lost.

[0055] The first groove section 2210 includes a fourth groove wall surface 2212, which is an inclined surface, and the inclination angle c2 of the fourth groove wall surface 2212 is 43° to 47°; the first middle tread block 220 is also provided with a third section 223, which is located at an end of the second groove section 2211 away from the first groove section 2210 and connected to the fifth groove wall surface 2213 of the second groove section 2211. The third section 223 can improve the tire corner effect, improve the effect of the tire tread block in cutting the water film, and reduce the wear of the sharp corner position during the tire driving process.

[0056] like Figure 5 As shown, the intersection of the center line BD and CE of the diamond BCDE on the first middle tread block 220 is set as point A, and two adjacent knife-shaped grooves (the third groove 221 and the fourth groove 222) are arranged symmetrically about point A to avoid the loss of rigidity on one side of the tread block in this area due to the same direction arrangement of the knife-shaped grooves, resulting in eccentric wear.

[0057] The second middle pattern block 230 is provided with a plurality of fifth grooves 231 and a plurality of sixth grooves 232, which are alternately and spaced apart in sequence along the extension direction of the second middle pattern block 230; the two ends of the fifth groove 231 are respectively connected to the third longitudinal groove 330 and the fourth longitudinal groove 340; one end of the sixth groove 232 is connected to the third longitudinal groove 330, and the other end is a closed end.

[0058] The width of the second middle pattern block 230 is w2, and the width of the sixth groove 232 is w3, w3 = (2 / 3) w2. This arrangement further strengthens the rigidity of the outer side of the pattern and improves handling; when the width w3 is large, the rigidity of the pattern block in this area is reduced, the tire's dry handling loss is serious, and the airflow vibration in the pattern groove in this area causes the tube cavity noise to increase; if the width w3 is small, the handling is guaranteed, the impact noise of the pattern block in this area is increased, and the comfort is lost.

[0059] The second section is provided at both ends of each fifth groove 231, which further ensures the rigidity of the outer side of the tire and improves the handling of the tire. The number and width of the grooves provided in the first middle pattern block 220 and the second middle pattern block 230 can reduce the inflow of gas and reduce gas vibration during the running of the tire, and balance the rigidity and ground contact area of ​​the pattern block in the form of cutting angles.

[0060] The first shoulder pattern block 240 is provided with a plurality of seventh grooves 241, which are arranged at intervals along the extension direction of the first shoulder pattern block 240, and the extension direction of each seventh groove 241 has an angle α1 with the extension direction of the first shoulder pattern block 240, α1=7°±2°; the seventh groove 241 includes a third groove section 2410 and a fourth groove section 2411 which are connected to each other, the fourth groove section 2411 is connected to the first longitudinal groove 310, and the width of the third groove section 2410 is greater than the width of the fourth groove section 2411. This arrangement balances the pressure in the overall tire contact surface, improves the handling of the tire's outer side, ensures the wet performance of the tire's inner side, ensures the handling of the force by the shoulder part during the tire's turning process, ensures the precise control of the vehicle, and effectively prevents the tire from wearing unevenly.

[0061] The second shoulder pattern block 250 is provided with a plurality of eighth grooves 251 and a plurality of ninth grooves 252, which are arranged alternately and at intervals along the extension direction of the second shoulder pattern block 250, and each eighth groove 251 is connected with the fourth longitudinal groove 340; there is an angle α2 between the extension direction of each eighth groove 251 and the extension direction of the second shoulder pattern block 250, α2 = 7° ± 2°. This arrangement cooperates with the structure of the first shoulder pattern block 240 to balance the pressure in the overall tire contact surface, improve the handling of the tire's outer side, ensure the wet performance of the tire's inner side, ensure the handling of the force of the tire shoulder during the tire turning process, ensure the precise control of the vehicle, and effectively prevent the tire from wearing unevenly.

[0062] The outer diameter of the tire 100 is R, the first middle pattern block 220 is provided with a third groove 221 and a fourth groove 222 arranged at intervals, and the second middle pattern block 230 is provided with a fifth groove 231 and a sixth groove 232 arranged at intervals; the vertical distance between the third groove 221 and the fifth groove 231 is 2*w10, w10 = (0.0079 ± 0.0005) R. Through simulation optimization of the misalignment, if the w10 distance is small, the length of the lateral grooves simultaneously contacting the ground when the tire is running is large, the airflow storage capacity in the tire contact surface is large, the airflow vibration is serious, and the comfort is reduced. If w10 is large, the rigidity of the middle pattern block and the crown pattern block is large, the tire impacts the road seriously, resulting in a detailed tire impact noise, and the comfort is also reduced.

[0063] Taking the axial direction of the tire 100 as the width direction, the ratio of the width of the first middle pattern block 220, the width of the crown pattern block 210 and the width of the second middle pattern block 230 is 1.08:1:1.08. By setting the ratio of the width of the first middle pattern block 220, the width of the crown pattern block 210 and the width of the second middle pattern block 230, the impact of the pattern block on the road surface is reduced, the vibration of the tire is reduced, the pattern block is fully in contact with the ground, and the ground contact area is increased.

[0064] The tire 100 includes a first layer 110, a second layer 120 and a third layer 130. The first layer 110, the second layer 120 and the third layer 130 are connected in sequence from the circumferential surface of the tire 100 to the axis centerline. The maximum thickness of the first layer 110 is h2, the maximum thickness of the second layer 120 is h3, and the maximum thickness of the third layer 130 is h4, h2=h3, h4=1.5mm±0.5mm. The Shore hardness of each layer is: the Shore hardness L1 of the first layer 110 is less than the Shore hardness L2 of the second layer 120 and less than the Shore hardness L3 of the third layer 130. The Shore hardness difference is guaranteed to be 5±1. This hardness setting can effectively reduce the impact of the road on the tire and has a good ability to absorb vibration. When the vibration waveform passes through media of different densities, the energy loss is serious. A multi-layer tread rubber material is set to absorb vibration and weaken the transmission of vibration energy. In addition to absorbing vibration, L3 also serves as a bonding agent between the tread and other parts. At the same time, its aging performance is poor, so it should not be set too large. For example, if h4 is too large, the tire will easily crack at the bottom of the groove during use. The thickness parameters are set to further ensure that the tread absorbs vibration during driving and improve comfort. To verify this design point, the design ratio is tested as follows:

[0065]

[0066]

[0067] The results are expressed as a score with the comparative example being 100, and a larger value indicates a more excellent performance.

[0068] In order to verify the effectiveness of this design, the optimized parameters were designed according to the above parameters, and the performance of each test tire was tested with the old product. The test evaluation results are as follows:

[0069] Evaluation Project Old products This program designs new products Fuel Economy 100 102 Comfort 100 112 Noise in the car 100 108 Wet handling 100 100 Dry handling 100 103 Wet braking 100 101 Dry braking 100 105

[0070] The results are expressed as a score with the comparative example being 100, and a larger value indicates a more excellent performance.

[0071] The tire tread pattern is set to the outside and inside, and the pattern pitches on both sides are arranged in disorder. The number and arrangement of the outer pitches are the same. There are 4 different pattern pitches along the circumference of the tire, namely the first pattern pitch P1, the second pattern pitch P2, the third pattern pitch P3, and the fourth pattern pitch P4. After simulation calculation optimization, the four pattern pitches have the following relationship: P1: P2: P3: P4 = 1: (1.143 ± 0.03): (1.291 ± 0.03): (1.45 ± 0.03). In order to balance the overall rigidity and vibration of the tire, thereby optimizing the tire pattern noise, this pitch setting greatly improves the shoulder stress, alleviates the shoulder vibration, and improves the quiet performance. Specifically, the pattern pitch refers to the distance between the center line of the eighth groove 251 and the center line of the ninth groove 252.

[0072] In order to further verify the design point, a comparative sculpture tire was set up for performance comparison:

[0073]

[0074]

[0075] The results are expressed as a score with the comparative example being 100, and a larger value indicates a more excellent performance.

[0076] The performance of the test vehicle when driving at a specified speed on a professional test field simulating a city road is evaluated. The results are expressed as an index with the value of the comparative example being 100, and a larger value indicates better driving stability.

[0077] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0078] According to the tire provided by the present application, the tire 100 has a tread, and the tread includes: a crown pattern block 210; a first middle pattern block 220 and a second middle pattern block 230, and the first middle pattern block 220 and the second middle pattern block 230 are respectively arranged on both sides of the crown pattern block 210; wherein, a plurality of third grooves 221 and a plurality of fourth grooves 222 are arranged on the first middle pattern block 220, and the plurality of third grooves 221 and the plurality of fourth grooves 222 are arranged alternately and at intervals in the extension direction of the first middle pattern block 220, and the adjacent third grooves 221 and the fourth grooves 222 are arranged in a central symmetric manner; the extension direction of each third groove 221 and / or each fourth groove 222 has an angle θ with the extension direction of the first middle pattern block 220, θ=62±3°. Such an arrangement strengthens the rigidity of the outer side of the pattern, improves the controllability of the tire, reduces the phenomenon of the pattern block tipping during the driving of the tire, and thus reduces the high-frequency noise problem of the tire.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tire, the tire (100) having a tread, the tread comprising: Crown tread block (210); A first middle pattern block (220) and a second middle pattern block (230), wherein the first middle pattern block (220) and the second middle pattern block (230) are respectively arranged on both sides of the crown pattern block (210); The first middle pattern block (220) is provided with a plurality of third grooves (221) and a plurality of fourth grooves (222), the plurality of third grooves (221) and the plurality of fourth grooves (222) are arranged alternately and at intervals in the extending direction of the first middle pattern block (220), and the adjacent third grooves (221) and the fourth grooves (222) are arranged in a centrally symmetrical manner; An angle θ is formed between an extension direction of each of the third grooves (221) and / or each of the fourth grooves (222) and an extension direction of the first middle pattern block (220), where θ=62±3°.

2. The tire according to claim 1, characterized in that The running surface curve of the tire (100) has an unfolded width of TAW, the width of the first middle pattern block (220) and the width of the second middle pattern block (230) are respectively (12.4%±1%) TAW; and the width of the crown pattern block (210) is (11.1%±1%) TAW.

3. The tire according to claim 1, characterized in that The rolling surface curve development width of the tire (100) is TAW, and the nominal cross-sectional width of the tire (100) is SN; 0.78≤TAW / SN≤0.

82.

4. The tire according to claim 1, characterized in that The running surface curve of the tire (100) has an unfolded width of TAW; The tread further comprises: a first shoulder pattern block (240) and a second shoulder pattern block (250), wherein the first shoulder pattern block (240) is arranged on a side of the first middle pattern block (220) away from the crown pattern block (210), and the second shoulder pattern block (250) is arranged on a side of the second middle pattern block (230) away from the crown pattern block (210); A first longitudinal groove (310) is disposed between the first middle tread block (220) and the first shoulder tread block (240), wherein a width of the first longitudinal groove (310) is (6.2%±0.3%) TAW; A second longitudinal groove (320) is disposed between the crown pattern block (210) and the first middle pattern block (220), and a width of the second longitudinal groove (320) is (6.8%±0.3%) TAW; A third longitudinal groove (330) is arranged between the crown pattern block (210) and the second middle pattern block (230), and the width of the third longitudinal groove (330) is (6.8%±0.3%) TAW; The fourth longitudinal groove (340) is arranged between the second middle tread block (230) and the second shoulder tread block (250), and the width of the fourth longitudinal groove (340) is (6.2%±0.3%) TAW.

5. The tire according to claim 4, characterized in that The crown pattern block (210) is provided with a plurality of first grooves (211), the plurality of first grooves (211) are arranged at intervals along the extension direction of the crown pattern block (210), each of the first grooves (211) extends along a first direction, an angle β is formed between the first direction and the extension direction of the crown pattern block (210), and the range of β is 45° to 55°; The first groove (211) comprises a first groove wall surface (212), the first groove wall surface (212) is an inclined surface, and the inclination angle c1 of the first groove wall surface (212) is 43° to 47°.

6. The tire according to claim 5, characterized in that A first reinforcing rib (213) is disposed in the first groove (211), and the height of the first reinforcing rib (213) is h1, where h1=(0.25-0.3)h; The width of the first reinforcing rib (213) is w4, the maximum length of the first groove (211) is w5, w4=(0.35±0.1)w5.

7. The tire according to claim 5, characterized in that The crown pattern block (210) is also provided with a plurality of second grooves (214), the plurality of first grooves (211) and the plurality of second grooves (214) are arranged alternately and at intervals in the extension direction of the crown pattern block (210), the width of the second grooves (214) is w1, the width of the crown pattern block (210) is w, and w1=(2 / 3)w; Wherein, each of the first grooves (211) is connected to the third longitudinal groove (330), each of the second grooves (214) is connected to the second longitudinal groove (320), and the second groove (214) is located in the middle position of two adjacent first grooves (211).

8. The tire according to claim 7, characterized in that The second groove (214) extends along a predetermined arc track; The second groove (214) comprises a second groove wall surface (2140) and a third groove wall surface (2141) which are arranged opposite to each other, the arc radius of the second groove wall surface (2140) is R1, the arc radius of the third groove wall surface (2141) is R3, and R3 = (R1 + R2) / 2.

9. The tire according to claim 8, characterized in that The second groove (214) comprises a first groove end (2143) communicating with the second longitudinal groove (320); a first section (215) is provided on the crown pattern block (210); the first section (215) is located at the first groove end (2143) and connected to the second groove wall surface (2140); The maximum width of the first cut surface (215) is 3 mm.

10. The tire according to claim 1, characterized in that The crown pattern block (210) is provided with a plurality of first grooves (211), the plurality of first grooves (211) are arranged at intervals along the extension direction of the crown pattern block (210), each of the first grooves (211) extends along a first direction, an angle β is formed between the first direction and the extension direction of the crown pattern block (210), and the range of β is 45° to 55°; 10°≤θ-β≤20°.

11. The tire according to claim 10, characterized in that The third groove (221) comprises a first groove segment (2210) and a second groove segment (2211) which are connected to each other, the first groove segment (2210) is farther away from the crown pattern block (210) relative to the second groove segment (2211), the width of the first groove segment (2210) is w6, the width of the second groove segment (2211) is w7, and w6:w7=1:

2.

12. The tire according to claim 11, characterized in that The first groove section (2210) comprises a fourth groove wall surface (2212), the fourth groove wall surface (2212) is an inclined surface, and the inclination angle c2 of the fourth groove wall surface (2212) is 43° to 47°; A third section (223) is also provided on the first middle pattern block (220), and the third section (223) is located at an end of the second groove segment (2211) away from the first groove segment (2210) and connected to the fifth groove wall surface (2213) of the second groove segment (2211).

13. The tire according to claim 4, characterized in that The second middle pattern block (230) is provided with a plurality of fifth grooves (231) and a plurality of sixth grooves (232), wherein the plurality of fifth grooves (231) and the plurality of sixth grooves (232) are alternately and spacedly arranged in sequence along the extension direction of the second middle pattern block (230); Two ends of the fifth groove (231) are respectively connected to the third longitudinal groove (330) and the fourth longitudinal groove (340); One end of the sixth groove (232) is connected to the third longitudinal groove (330), and the other end is a closed end.

14. The tire according to claim 13, characterized in that The width of the second middle pattern block (230) is w2, the width of the sixth groove (232) is w3, and w3=(2 / 3)w2.

15. The tire according to claim 4, characterized in that The first shoulder pattern block (240) is provided with a plurality of seventh grooves (241), the plurality of seventh grooves (241) are arranged at intervals along the extension direction of the first shoulder pattern block (240), and an angle α1 is formed between the extension direction of each of the seventh grooves (241) and the extension direction of the first shoulder pattern block (240), α1=7°±2°; The seventh groove (241) includes a third groove segment (2410) and a fourth groove segment (2411) which are connected to each other, the fourth groove segment (2411) is connected to the first longitudinal groove (310), and the width of the third groove segment (2410) is greater than the width of the fourth groove segment (2411).

16. The tire according to claim 15, characterized in that The second shoulder pattern block (250) is provided with a plurality of eighth grooves (251) and a plurality of ninth grooves (252), the plurality of eighth grooves (251) and the plurality of ninth grooves (252) are arranged alternately and at intervals in the extending direction of the second shoulder pattern block (250), and each of the eighth grooves (251) is connected to the fourth longitudinal groove (340); An included angle α2 is formed between the extension direction of each of the eighth grooves (251) and the extension direction of the second shoulder pattern block (250), where α2=7°±2°.

17. The tire according to claim 1, characterized in that The outer diameter of the tire (100) is R, the first middle tread block (220) is provided with a third groove (221) and a fourth groove (222) arranged at intervals, and the second middle tread block (230) is provided with a fifth groove (231) and a sixth groove (232) arranged at intervals; The vertical distance between the third groove (221) and the fifth groove (231) is 2*w10, w10=(0.0079±0.0005)R.

18. The tire according to claim 1, characterized in that The tire (100) comprises a first layer (110), a second layer (120) and a third layer (130), wherein the first layer (110), the second layer (120) and the third layer (130) are connected in sequence from the circumferential surface of the tire (100) to the axis centerline; The maximum thickness of the first layer (110) is h2, the maximum thickness of the second layer (120) is h3, and the maximum thickness of the third layer (130) is h4, where h2=h3, h4=1.5mm±0.5mm.

19. The tire according to claim 1, characterized in that Taking the axial direction of the tire as the width direction, the ratio among the width of the first middle pattern block (220), the width of the crown pattern block (210) and the width of the second middle pattern block (230) is 1.08:1:1.08.

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