Tire

Abstract

The invention provides a tire, the tread of the tire is provided with a pattern structure, the pattern structure is a centrosymmetric structure, and the pattern structure comprises two circumferential grooves which are arranged at intervals along the rotation axis of the tire so as to divide the pattern structure into a middle pattern strip and two shoulder pattern strips; the transverse grooves are formed in the circumferential direction of the tire at intervals, each transverse groove comprises a middle transverse groove and two shoulder transverse grooves, so that the middle pattern strip is divided into a plurality of middle pattern blocks, each shoulder pattern strip is divided into a plurality of shoulder pattern blocks, and the shoulder pattern blocks directly face the middle transverse grooves one to one; each shoulder pattern block and the two middle pattern blocks located on the two opposite sides of the middle transverse groove right opposite to the shoulder pattern block jointly define a polygonal groove used for containing stones; the problems that in the prior art, due to the fact that too many pattern grooves are formed in a tire used in a surface mine, cutting stabbing and stone clamping are likely to happen, and the abrasion resistance is reduced are solved.

Description

Technical Field

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

[0002] The application scenarios of giant engineering machinery radial tires are distributed in open-pit mines around the world. Their road conditions are related to local climate, mine management, and the types of mined ore, and are different in different mines.

[0003] The wear resistance, heat resistance and traction of tires determine the service life of tires in mines, the working efficiency of tires in mines and the safety of working environment. In addition to the rubber formula that can affect the above performance of tires, the pattern of tires also plays an important role in heat resistance and traction.

[0004] The main grooves of the tire can be divided into two types: longitudinal grooves and transverse grooves. The longitudinal grooves are parallel to the circumferential centerline of the tire, while the transverse grooves are perpendicular to the longitudinal grooves, or nearly perpendicular. Some transverse grooves have an angle of less than 45 degrees with the longitudinal grooves. In addition, the tire also has secondary grooves (sipes), which can be longitudinal or transverse. Their characteristics are that their width and depth are smaller than the main grooves.

[0005] There are many factors to consider when designing the tread pattern of giant construction machinery radial tires for dump trucks used in open-pit mines, including but not limited to: analyzing the geological conditions of the mine, including factors such as surface conditions, rock types and humidity; focusing on improving the tire's traction on different surfaces in the design to ensure that the dump truck can travel in various working conditions; ensuring that the pattern design can self-clean up mud, ore and other debris to prevent their accumulation and affect performance; considering adding design elements to the pattern to adapt to different weather conditions, such as rainy seasons and slippery roads.

[0006] In this regard, someone has proposed an inflatable tire for construction vehicles, which has a plurality of circumferential main grooves extending continuously on the ground contact surface of the tread and a plurality of transverse grooves connected in the width direction, so as to divide the pattern structure into a plurality of pattern blocks. In a certain area, a pattern block truncation groove is provided on the pattern block, and the pattern block truncation groove opens on the transverse groove and has a depth shallower than the circumferential main groove, so as to divide the pattern block into a plurality of small pattern blocks. At the same time, a pattern block sub-groove is provided, and the pattern block sub-groove opens on the circumferential main groove and has a depth shallower than the circumferential main groove.

[0007] The tread block truncation grooves and tread block auxiliary grooves in the above-mentioned pneumatic tire for construction vehicles effectively increase the heat dissipation surface area of ​​the tire tread, provide more channels for air circulation, and thus improve the heat resistance of the tire to a certain extent. However, too many divided tread blocks reduce the overall rigidity of the pattern structure. When the tire is used in a mining environment with poor road maintenance, a lot of gravel and slippery, too many divided tread grooves are more likely to cause risks such as cutting and stabbing, and stone clamping, and lead to a decrease in the saturation of the tire tread, so that the tire tread will lose a certain amount of wear resistance. Summary of the invention

[0008] The main purpose of the present invention is to provide a tire to solve the problems of the tires used in open-pit mines in the prior art being more prone to cutting and stabbing, stone clamping and reduced wear resistance due to too many divided pattern grooves.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a tire is provided, wherein a pattern structure is arranged on the tread of the tire, and the pattern structure is a centrally symmetrical structure, and the pattern structure comprises: two circumferential grooves, the two circumferential grooves are arranged at intervals along the rotation axis of the tire to separate the pattern structure into a middle pattern strip and two shoulder pattern strips respectively located on both sides of the middle pattern strip; a plurality of transverse grooves, the plurality of transverse grooves are arranged at intervals along the circumference of the tire, each transverse groove comprises a middle transverse groove and two shoulder transverse grooves respectively connected to the two ends of the middle transverse groove, so as to separate the middle pattern strip into a plurality of middle pattern blocks, and each shoulder pattern strip is separated into a plurality of shoulder pattern blocks, and the plurality of shoulder pattern blocks are arranged one by one opposite to the plurality of middle transverse grooves; wherein each shoulder pattern block and the two middle pattern blocks located on the opposite sides of the middle transverse groove opposite to the shoulder pattern block together form a polygonal groove for receiving and placing stones.

[0010] Further, the groove wall surface of the polygonal groove includes: a first wall surface and a second wall surface, the first wall surface and the second wall surface are both partial block side wall surfaces of one of the corresponding two middle pattern blocks, and the first wall surface and the second wall surface are respectively arranged close to the other of the corresponding two middle pattern blocks and the corresponding shoulder pattern block; a third wall surface, the third wall surface is a partial block side wall surface of the other of the corresponding two middle pattern blocks, and the third wall surface is arranged close to the corresponding shoulder pattern block; a fourth wall surface and a fifth wall surface, the fourth wall surface and the fifth wall surface are both partial block side wall surfaces of the corresponding shoulder pattern block, and the fourth wall surface and the fifth wall surface are respectively arranged close to the corresponding two middle pattern blocks; wherein the fourth wall surface is located on the side of the fifth wall surface away from the third wall surface, the second wall surface is located on the side of the first wall surface away from the third wall surface, and the first wall surface and the fourth wall surface are arranged opposite to each other.

[0011] Furthermore, the angle between the second wall surface and the third wall surface is 40° to 70°; and / or the angle between the third wall surface and the fifth wall surface is 40° to 70°; and / or the angle between the second wall surface and the fifth wall surface is 40° to 70°.

[0012] Further, the shape of the polygonal groove is determined by the first point, the second point, the third point and the fourth point; the first point is located on the intersection line between the first wall surface and the second wall surface; the second point is located on the intersection line between the side of the third wall surface close to the second wall surface and the side wall surface connected to the third wall surface; the third point is located on the intersection line between the side of the fifth wall surface away from the fourth wall surface and the side wall surface connected to the fifth wall surface; the fourth point is located on the intersection line between the fourth wall surface and the fifth wall surface; the relationship between the first point, the second point, the third point and the fourth point is:

[0013]

[0014] Among them, the projection distance from the first point to the circumferential center line of the tire is a, the projection distance from the second point to the circumferential center line of the tire is b, the projection distance from the third point to the circumferential center line of the tire is c, and the projection distance from the fourth point to the circumferential center line of the tire is d. a and d are selected by the designer, p=90, q=50.

[0015] Further, the circumferential groove includes a plurality of circumferential groove segments, each circumferential groove segment includes a first groove body and a second groove body connected to each other, and the angles between the first groove body and the second groove body are both obtuse angles; the length of the first groove body is greater than the length of the second groove body; and / or the middle transverse groove is a centrally symmetrical structure, the two shoulder transverse grooves are centrally symmetrically arranged about the symmetry center of the corresponding middle transverse groove, and the angles between each shoulder transverse groove and the corresponding middle transverse groove are both obtuse angles.

[0016] Furthermore, a transverse groove protrusion is arranged on the groove bottom surface of the middle transverse groove, and the height of the transverse groove protrusion is smaller than the depth of the middle transverse groove; and / or a circumferential groove protrusion is arranged on the groove bottom surface of the second groove body, and the height of the circumferential groove protrusion is smaller than the depth of the second groove body.

[0017] Further, the width of the middle lateral groove is w121, and the width of the circumferential groove is w11; wherein w40=w512; or w121 / w11=1 to 1.1; and / or the depth of the middle lateral groove is h121, and the depth of the circumferential groove is h11; wherein h121=h11; and / or the width of at least part of the shoulder lateral groove gradually increases in the direction away from the middle tread strip; and / or the depth of at least part of the shoulder lateral groove gradually decreases in the direction away from the middle tread strip.

[0018] Further, the pattern structure includes a plurality of fine grooves, which include: middle fine grooves, each middle pattern block is provided with a middle fine groove, and both ends of the middle fine groove are respectively connected to the two circumferential grooves; and / or shoulder fine grooves, each shoulder pattern block is provided with a shoulder fine groove, one end of the shoulder fine groove is connected to the corresponding middle transverse groove, and the other end of the shoulder fine groove extends in a direction away from the middle pattern strip.

[0019] Furthermore, a middle fine groove protrusion is arranged on the bottom surface of the middle fine groove, and the height of the middle fine groove protrusion is less than the depth of the middle fine groove; and / or a shoulder fine groove protrusion is arranged on the bottom surface of the shoulder fine groove, and the height of the shoulder fine groove protrusion is less than the depth of the shoulder fine groove.

[0020] Further, the depth of the fine groove is h14, the depth of the circumferential groove is h11, wherein h14 / h11=0.5 to 0.8; and / or the width of the fine groove is w14, the distance between two adjacent transverse grooves is L12, wherein w14 / L12=0.02 to 0.07.

[0021] By applying the technical solution of the present invention, a pattern structure is arranged on the tread of the tire of the present invention, and the pattern structure is a centrally symmetrical structure, and the pattern structure includes: two circumferential grooves, the two circumferential grooves are arranged at intervals along the rotation axis of the tire to separate the pattern structure into a middle pattern strip and two shoulder pattern strips respectively located on both sides of the middle pattern strip; a plurality of transverse grooves, the plurality of transverse grooves are arranged at intervals along the circumference of the tire, each transverse groove includes a middle transverse groove and two shoulder transverse grooves respectively connected to the two ends of the middle transverse groove, so as to separate the middle pattern strip into a plurality of middle pattern blocks, and each shoulder pattern strip is divided into a plurality of shoulder pattern blocks, and the plurality of shoulder pattern blocks are arranged one by one opposite to the plurality of middle transverse grooves; wherein each shoulder pattern block and the two middle pattern blocks located on the opposite sides of the middle transverse groove opposite to the shoulder pattern block together form a polygonal groove for receiving and placing stones. In this way, the tire of the present invention forms a polygonal groove that can be contracted and expanded by arranging two circumferential grooves and multiple transverse grooves, so that the traction, heat dissipation and stone removal properties of the tire are improved, and the problems of tires used in open-pit mines in the prior art being more prone to cutting and stabbing, stone clamping and reduced wear resistance due to too many divided pattern grooves are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 A schematic structural diagram showing a pattern structure of an embodiment of a tire according to the present invention;

[0024] Figure 2 Shows Figure 1 The schematic diagram of a part of the structure of the pattern structure shown when the polygonal groove is in an expanded state;

[0025] Figure 3 Shows Figure 1 The schematic diagram of the partial structure of the pattern structure shown is when the polygonal groove is in a contracted state;

[0026] Figure 4 Shows Figure 1 A cross-sectional view of the pattern structure shown along the AA direction;

[0027] Figure 5 Shows Figure 1 A cross-sectional view of the pattern structure shown along the BB direction;

[0028] Figure 6 Shows Figure 1 A cross-sectional view of the pattern structure shown along the CC direction;

[0029] Figure 7 Shows Figure 1 A cross-sectional view of the pattern structure shown along the DD direction;

[0030] Figure 8 Shows Figure 1 A cross-sectional view of the pattern structure shown along the EE / GG direction;

[0031] Fig. 9 Shows Figure 1 A cross-sectional view of the pattern structure shown along the FF / HH direction;

[0032] Fig.10 Shows Figure 1 A comparison chart of the test data of the relationship between the first point, the second point, the third point and the fourth point of the pattern structure shown and the fitting formula when d remains unchanged (the origin represents the test number, the straight line represents the fitting formula, and the units of the abscissa and the ordinate are both mm);

[0033] Fig.11 Shows Figure 1 A comparison chart of the test data of the relationship between the first point, the second point, the third point and the fourth point of the pattern structure shown and the fitting formula when a remains unchanged (the origin represents the test number, the straight line represents the fitting formula, and the units of the horizontal and vertical axes are both mm).

[0034] The above drawings include the following reference numerals:

[0035] 11, circumferential groove; 111, circumferential groove segment; 1110, circumferential groove protrusion; 1111, first groove body; 1112, second groove body;

[0036] 12, transverse groove; 121, middle transverse groove; 1210, transverse groove protrusion; 122, shoulder transverse groove;

[0037] 13. Polygonal groove; 1301. First wall surface; 1302. Second wall surface; 1303. Third wall surface; 1304. Fourth wall surface; 1305. Fifth wall surface; 131. First point; 132. Second point; 133. Third point; 134. Fourth point;

[0038] 14, thin groove; 141, middle thin groove; 1410, middle thin groove protrusion; 142, shoulder thin groove; 1420, shoulder thin groove protrusion;

[0039] 15. Tire circumferential centerline;

[0040] 21. Middle pattern strip; 210. Middle pattern block; 22. Shoulder pattern strip; 220. Shoulder pattern block. 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] like Figures 1 to 9 As shown, the present invention provides a tire, wherein a pattern structure is arranged on the tread of the tire, and the pattern structure is a central symmetrical structure, and the pattern structure comprises: two circumferential grooves 11, the two circumferential grooves 11 are arranged at intervals along the rotation axis of the tire to separate the pattern structure into a middle pattern strip 21 and two shoulder pattern strips 22 respectively located on both sides of the middle pattern strip 21; a plurality of transverse grooves 12, the plurality of transverse grooves 12 are arranged at intervals along the circumference of the tire, and each transverse groove 12 comprises a middle transverse groove 121 and a shoulder pattern strip 22 respectively located on both sides of the middle pattern strip 21; Two shoulder transverse grooves 122 connected to the two ends of the middle transverse groove 121 are used to divide the middle pattern strip 21 into a plurality of middle pattern blocks 210, and each shoulder pattern strip 22 is divided into a plurality of shoulder pattern blocks 220, and the plurality of shoulder pattern blocks 220 are arranged one by one opposite to the plurality of middle transverse grooves 121; wherein each shoulder pattern block 220 and the two middle pattern blocks 210 located on the opposite sides of the middle transverse groove 121 opposite to the shoulder pattern block 220 together form a polygonal groove 13 for receiving and placing stones.

[0043] In this way, the tire of the present invention forms a shrinkable and expandable polygonal groove 13 by setting two circumferential grooves 11 and multiple transverse grooves 12, so that the traction, heat dissipation and stone removal properties of the tire are improved, and the problems of tires used in open-pit mines in the prior art being more prone to cutting and stabbing, stone clamping and reduced wear resistance due to too many divided pattern grooves are solved.

[0044] Specifically, the above-mentioned pattern structure is in a single pitch form.

[0045] like Figures 1 to 3 As shown, the groove wall surface of the polygonal groove 13 includes: a first wall surface 1301 and a second wall surface 1302, the first wall surface 1301 and the second wall surface 1302 are both partial block side wall surfaces of one of the corresponding two middle pattern blocks 210, and the first wall surface 1301 and the second wall surface 1302 are respectively arranged close to the other middle pattern block 210 of the corresponding two middle pattern blocks 210 and the corresponding shoulder pattern block 220; a third wall surface 1303, the third wall surface 1303 is a partial block side wall surface of the other middle pattern block 210 of the corresponding two middle pattern blocks 210, and the third wall surface 1303 is a partial block side wall surface of the other middle pattern block 210 of the corresponding two middle pattern blocks 210, and the third wall surface 1303 is a partial block side wall surface of the other middle pattern block 210 of the corresponding two middle pattern blocks 210. The third wall 1303 is arranged close to the corresponding shoulder pattern block 220; the fourth wall 1304 and the fifth wall 1305, the fourth wall 1304 and the fifth wall 1305 are both partial pattern block side walls of the corresponding shoulder pattern block 220, and the fourth wall 1304 and the fifth wall 1305 are respectively arranged close to the corresponding two middle pattern blocks 210; wherein, the fourth wall 1304 is located on the side of the fifth wall 1305 away from the third wall 1303, the second wall 1302 is located on the side of the first wall 1301 away from the third wall 1303, and the first wall 1301 and the fourth wall 1304 are arranged opposite to each other.

[0046] like Figures 1 to 3 As shown, the angle between the second wall 1302 and the third wall 1303 is 40° to 70°; and / or the angle between the third wall 1303 and the fifth wall 1305 is 40° to 70°; and / or the angle between the second wall 1302 and the fifth wall 1305 is 40° to 70°. In this way, an effective polygonal groove 13 can be formed.

[0047] Preferably, the angle between the second wall 1302 and the third wall 1303 is 50° to 65°; the angle between the third wall 1303 and the fifth wall 1305 is 50° to 65°; the angle between the second wall 1302 and the fifth wall 1305 is 50° to 65°.

[0048] Further preferably, the angle between the second wall 1302 and the third wall 1303 is 55° to 60°; the angle between the third wall 1303 and the fifth wall 1305 is 55° to 60°; the angle between the second wall 1302 and the fifth wall 1305 is 55° to 60°.

[0049] like Figure 2 FIG. 1 is a schematic diagram showing an ideal structure of the tire pattern structure of the present invention in a natural state or in a pressure-releasing state after leaving the ground. Figure 3The figure shows a schematic diagram of the structure of the tire pattern of the present invention when it is in a ground contact and compressed state.

[0050] Depend on Figure 2 The polygonal groove 13 shown in FIG. Figure 3 The principle of the change of the polygonal groove 13 shown is that the tread is constantly in a cycle of contacting and lifting off the ground during the running process of the tire. When the tread is off the ground, the pattern structure presented is in a natural state, that is, Figure 2 As shown in the polygonal groove 13, when the tire touches the ground, the corresponding middle pattern block 210 and the shoulder pattern block 220 both enter the ground contact area. They are compressed in the radial direction of the tire due to the load, and then flattened when they are completely grounded. Due to the incompressibility of rubber, the pattern block sidewall surface of the corresponding middle pattern block 210 and the pattern block sidewall surface of the shoulder pattern block 220 will bulge and deform, squeezing the space occupied by the corresponding circumferential groove 11 and the transverse groove 12, so that the tire presents a Figure 3 The polygonal groove 13 is shown as being deformed under pressure.

[0051] The traction of a tire is greatly affected by the saturation of the tire tread. The pattern structure of the tire in the prior art only takes the saturation of the tire in its natural state as the starting point, but the pattern structure of the tire of the present invention takes the saturation of the tire tread when the tire is in contact with the ground as the end point. The effect of the saturation of the tire tread on the traction depends on the shape of the tire when it is in contact with the ground.

[0052] Taking the embodiment of the present invention as an example, when the tire touches the ground, the instantaneous saturation of the tread is 87%. If it is a tire pattern structure in the prior art, the polygonal groove 13 will not exist when the tire touches the ground, but the tread will be replaced, and the instantaneous saturation of the tread when it touches the ground is 92%. The present invention improves the grip of the tire from the aspect of the saturation of the tread, reduces the saturation of the tread by 5%, and the corresponding grip affected by the saturation is also improved by about 5%.

[0053] When the tire is not in contact with the ground and then contacts the ground, Figure 2 The polygonal groove 13 shown becomes Figure 3 The volume of the polygonal groove 13 is gradually reduced, and the loose soil pressed into the groove of the pattern structure will be gradually compacted to form a columnar soil block. When the tire is about to leave the ground, the compacted columnar soil block will form a shear force with the soil on the surrounding ground. When the shear force reaches the critical point, the columnar soil block will be broken up. The force formed in this process also provides a favorable factor for increasing the traction of the tire.

[0054] Same as above, when the tire changes from never touching the ground to touching the ground, Figure 2 The polygonal groove 13 shown becomes Figure 3The polygonal groove 13 shown has a gathering effect on the gravels on the ground. The gravels that should be randomly embedded in any groove of the pattern structure are stressed by the bulging deformation of the groove wall of the polygonal groove 13, and thus gather toward the center of the polygonal groove 13. When the tire touches the ground, the polygonal groove 13 clamps the gravels, and when the tire leaves the ground, the polygonal groove 13 releases the gravels.

[0055] like Figures 1 to 3 As shown, the shape of the polygonal groove 13 is determined by the first point 131, the second point 132, the third point 133 and the fourth point 134; the first point 131 is located on the intersection line between the first wall surface 1301 and the second wall surface 1302; the second point 132 is located on the intersection line between the side of the third wall surface 1303 close to the second wall surface 1302 and the side wall surface connected to the third wall surface 1303; the third point 133 is located on the intersection line between the side of the fifth wall surface 1305 away from the fourth wall surface 1304 and the side wall surface connected to the fifth wall surface 1305; the fourth point 134 is located on the intersection line between the fourth wall surface 1304 and the fifth wall surface 1305; the relationship between the first point 131, the second point 132, the third point 133 and the fourth point 134 is:

[0056]

[0057] Among them, the projection distance from the first point 131 to the tire circumferential center line 15 is a, the projection distance from the second point 132 to the tire circumferential center line 15 is b, the projection distance from the third point 133 to the tire circumferential center line 15 is c, and the projection distance from the fourth point 134 to the tire circumferential center line 15 is d.

[0058] The four key points of the first point 131 , the second point 132 , the third point 133 and the fourth point 134 determine the angle, area and position of the polygonal groove 13 , and further determine the conversion efficiency of the beneficial effects brought by the polygonal groove 13 .

[0059] In this formula, a and d are selected by the designer, and p and q are coefficients to ensure the beneficial effects of the polygonal groove 13; wherein, the purpose of the coefficient p is to control the angle input range to ensure that the change of the sine function is suitable for the parameter a; in the process of deriving the fitting formula, a large number of experiments were designed to obtain the coefficient q, and each set of test data recorded the input a and d, as well as the b and c values ​​measured by the experiment that meet the characteristics of the invention. When analyzing the data, it was observed that a and d have a nonlinear relationship with the growth trend of b and c, which is consistent with the exponential operation. Then, by fitting and analyzing a large amount of experimental data, the coefficient q is gradually adjusted, and the nonlinear least squares method (Levenberg-Marquardt algorithm) is used to fit the experimental results, so that the above fitting formula describes the measured b and c as accurately as possible.

[0060] In one embodiment, p=90; q=50.

[0061] Some representative experimental data are compared with the fitting formula, and the fitting of the formula is presented in the form of graphs. Fig.10 and Fig.11 The fitting effect between the a and d values ​​and the calculated b and c values ​​is shown. It can be seen that the fitting effect of the theoretical formula and the experimental data is very close, indicating that after adjusting the coefficient q, the formula can accurately describe the relationship between b and c and a and d.

[0062] According to the actual requirements for the tire pattern structure, the designer determines the positions of the first point 131 and the fourth point 134 by independently selecting the values ​​of a and d, and then calculates the values ​​of b and c through the above formula to determine the relative position relationship between the second point 132 and the third point 133 and the first point 131 and the fourth point 134, thereby achieving the beneficial effects of the polygonal groove 13 of the present invention.

[0063] like Figure 1 As shown, the circumferential groove 11 includes a plurality of circumferential groove segments 111, each circumferential groove segment 111 includes a first groove body 1111 and a second groove body 1112 connected to each other, and the angles between the first groove body 1111 and the second groove body 1112 are both obtuse angles; the length of the first groove body 1111 is greater than the length of the second groove body 1112; and / or the middle transverse groove 121 is a centrally symmetrical structure, and the two shoulder transverse grooves 122 are centrally symmetrically arranged about the symmetry center of the corresponding middle transverse groove 121, and the angles between each shoulder transverse groove 122 and the corresponding middle transverse groove 121 are both obtuse angles.

[0064] like Figure 1 , Figure 6 and Figure 7 As shown, a transverse groove protrusion 1210 is provided on the groove bottom surface of the middle transverse groove 121, and the height of the transverse groove protrusion 1210 is less than the depth of the middle transverse groove 121; and / or a circumferential groove protrusion 1110 is provided on the groove bottom surface of the second groove body 1112, and the height of the circumferential groove protrusion 1110 is less than the depth of the second groove body 1112. In this way, the rigidity of the middle pattern block 210 and the shoulder pattern block 220 can be strengthened.

[0065] Specifically, the width of the middle lateral groove 121 is w121, and the width of the circumferential groove 11 is w11; wherein w40=w512; or w121 / w11=1 to 1.1; and / or the depth of the middle lateral groove 121 is h121, and the depth of the circumferential groove 11 is h11; wherein h121=h11; and / or the width of at least part of the shoulder lateral groove 122 gradually increases in a direction away from the middle tread strip 21; and / or the depth of at least part of the shoulder lateral groove 122 gradually decreases in a direction away from the middle tread strip 21.

[0066] Among them, a part of the shoulder transverse groove 122 close to the middle pattern strip 21 gradually becomes shallower in an arc shape in the direction away from the middle pattern strip 21, and a part of the shoulder transverse groove 122 away from the middle pattern strip 21 gradually becomes shallower in a straight line shape in the direction away from the middle pattern strip 21.

[0067] Preferably, w121 / w11=1 to 1.06.

[0068] More preferably, w121 / w11=1 to 1.03.

[0069] like Figure 1 , Figure 8 and Fig. 9 As shown, the pattern structure includes a plurality of fine grooves 14, and the plurality of fine grooves 14 include: an intermediate fine groove 141, each intermediate pattern block 210 is provided with an intermediate fine groove 141, and the two ends of the intermediate fine groove 141 are respectively connected to the two circumferential grooves 11; and / or a shoulder fine groove 142, each shoulder pattern block 220 is provided with a shoulder fine groove 142, one end of the shoulder fine groove 142 is connected to the corresponding intermediate transverse groove 121, and the other end of the shoulder fine groove 142 extends in a direction away from the intermediate pattern strip 21.

[0070] In this way, each intermediate fine groove 141 divides the corresponding intermediate pattern block 210 into two intermediate pattern bodies within a range that does not disappear due to wear; each shoulder fine groove 142 divides the corresponding shoulder pattern block 220 into two shoulder pattern bodies within a range that does not disappear due to wear.

[0071] The combination of the polygonal groove 13 and the plurality of fine grooves 14 of the present invention also greatly improves the heat dissipation of the tire. Figure 1As shown, the shoulder fine groove 142 on the shoulder pattern block 220 has one end close to the tire circumferential center line 15 located on the fifth wall surface 1305 of the polygonal groove 13, and one end away from the tire circumferential center line 15 extends to the sidewall surface at the tire shoulder, that is, the shoulder fine groove 142 connects the passage between the inside of the tread and the outside air. When the tread of the tire gradually touches the ground, the volume of the polygonal groove 13 gradually decreases, and forms a closed space with the road surface when it is completely grounded. The air in the polygonal groove 13 is compressed, and the pressure increases in a short time. At this time, only the shoulder fine groove 142 can discharge the compressed air from the inside of the polygonal groove 13 to the outside, and a high-speed air flow is generated in the shoulder fine groove 142; when the tire gradually leaves the ground, the volume of the polygonal groove 13 gradually expands, and forms an open space when it is completely off the ground. The air in the polygonal groove 13 is instantly diluted, and the pressure decreases in a short time. At this time, only the shoulder fine groove 142 can allow air to flow from the outside to the inside of the tread, and a high-speed air flow is generated in the shoulder fine groove 142. Therefore, the setting of the above-mentioned polygonal groove 13 not only enables the middle fine groove 141 and the shoulder fine groove 142 to exchange heat with the air for passive heat dissipation by increasing the surface area of ​​the tire pattern groove, but also enables the shoulder fine groove 142 to form a high-speed airflow to exchange heat with the outside world, thereby realizing active cooling of the groove surface of the pattern structure.

[0072] The beneficial effect of heat dissipation is further described as follows:

[0073] The surfaces of all grooves in the tire's tread structure that are in direct contact with the outside air (including circumferential grooves, transverse grooves, and fine grooves) dissipate heat through natural convection. For natural convection, the relationship between convection heat dissipation and fluid convection flow and temperature difference can be expressed by the empirical formula of natural convection:

[0074] q = h*A*ΔT;

[0075] Among them, q is the amount of heat lost per unit time, h is the convective heat transfer coefficient, A is the heat dissipation area, and ΔT is the temperature difference. It can be concluded from the formula that the increase in the surface area of ​​the grooves of the pattern structure has a direct beneficial effect on the surface heat dissipation of the tire. The pattern structure of the tire of the present invention is provided with an intermediate fine groove 141 on the intermediate pattern block 210 and a shoulder fine groove 142 on the shoulder pattern block 220, both of which are aimed at enhancing natural convection heat dissipation. Through calculation, it can be concluded that the surface area of ​​the tire is increased by 13% when the fine groove 14 is provided compared with the case where the fine groove 14 is not provided, that is, the heat dissipation area A is increased by 13%. For a single experimental object, the convective heat transfer coefficient h and the temperature difference ΔT are the same. It can be calculated through the above formula that the amount of heat loss per unit time of the tire has increased by 13% year-on-year, thereby improving the heat dissipation of the tire.

[0076] On the other hand, by designing a polygonal groove 13 whose volume can be dynamically expanded and contracted, forced convection can be achieved for the fine groove 14. For forced convection, the Nu-Sherwood number relationship is usually used to describe the characteristics of convective heat transfer:

[0077] Nu=C*Re^m*Pr^n;

[0078] Among them, Nu is the Nusselt number, which indicates the intensity of convective heat transfer and mass transfer; Re is the Reynolds number, which indicates the relative size of inertial force and viscous force; Pr is the Prandtl number, which indicates the relative size of dynamic viscosity and heat transfer rate; C, m and n are experimental constants. With the increase of air velocity, the inertial force increases and the viscous force decreases, that is, the Reynolds number Re increases; with the increase of air velocity, the dynamic viscosity increases, and the heat transfer rate decreases due to the decrease in the time that the air stays on the groove wall, and the Prandtl number Pr increases. According to the Nu-Sherwood number relationship, the convective heat transfer intensity increases, and the heat dissipation capacity of the tire tread surface is improved.

[0079] like Figure 1 As shown, a middle fine groove protrusion 1410 is provided on the groove bottom surface of the middle fine groove 141, and the height of the middle fine groove protrusion 1410 is less than the depth of the middle fine groove 141; and / or a shoulder fine groove protrusion 1420 is provided on the groove bottom surface of the shoulder fine groove 142, and the height of the shoulder fine groove protrusion 1420 is less than the depth of the shoulder fine groove 142. In this way, the rigidity of the middle pattern block 210 and the shoulder pattern block 220 can be strengthened.

[0080] Specifically, the depth of the fine groove 14 is h14, the depth of the circumferential groove 11 is h11, wherein h14 / h11=0.5 to 0.8; and / or the width of the fine groove 14 is w14, the distance between two adjacent transverse grooves 12 is L12, wherein w14 / L12=0.02 to 0.07.

[0081] Preferably, h14 / h11=0.6 to 0.8; w14 / L12=0.03 to 0.06.

[0082] More preferably, h14 / h11=0.65 to 0.7; w14 / L12=0.03 to 0.05.

[0083] The depth of the thin groove 14 is set to be variable from one end to the other end in the extending direction.

[0084] like Fig. 9 As shown, the two ends of the middle fine groove protrusion 1410 and the corresponding groove bottom surface of the middle fine groove 141 as well as the two ends of the shoulder fine groove protrusion 1420 and the corresponding groove bottom surface of the shoulder fine groove 142 are transitionally connected by a fillet R1 with a radius of 30mm to 50mm.

[0085] Preferably, R1 is 35 mm to 45 mm.

[0086] More preferably, R1 is 40 mm to 45 mm.

[0087] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0088] The tire of the present invention is provided with a pattern structure on the tread, and the pattern structure is a central symmetrical structure, and the pattern structure includes: two circumferential grooves 11, the two circumferential grooves 11 are arranged at intervals along the rotation axis of the tire to separate the pattern structure into a middle pattern strip 21 and two shoulder pattern strips 22 respectively located on both sides of the middle pattern strip 21; a plurality of transverse grooves 12, the plurality of transverse grooves 12 are arranged at intervals along the circumference of the tire, and each transverse groove 12 includes a middle transverse groove 121 and a shoulder pattern strip 22 respectively connected to the middle transverse groove 121. Two shoulder transverse grooves 122 connected at both ends of the shoulder pattern strip 121 are used to divide the middle pattern strip 21 into a plurality of middle pattern blocks 210, and each shoulder pattern strip 22 is divided into a plurality of shoulder pattern blocks 220, and the plurality of shoulder pattern blocks 220 are arranged one by one opposite to the plurality of middle transverse grooves 121; wherein each shoulder pattern block 220 and the two middle pattern blocks 210 located on the opposite sides of the middle transverse groove 121 opposite to the shoulder pattern block 220 jointly form a polygonal groove 13 for receiving and releasing stones. In this way, the tire of the present invention forms a retractable and expandable polygonal groove 13 by arranging two circumferential grooves 11 and a plurality of transverse grooves 12, so that the traction, heat dissipation and stone discharge of the tire are all improved, and the problems that the tire used in the open-pit mine in the prior art is more likely to be cut and stabbed, stone is clamped and the wear resistance is reduced due to too many pattern grooves are divided are solved.

[0089] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0090] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0091] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0092] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0093] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0094] 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, characterized in that: The tire tread is provided with a pattern structure, the pattern structure is a centrally symmetrical structure, and the pattern structure comprises: Two circumferential grooves (11), the two circumferential grooves (11) being arranged at intervals along the rotation axis of the tire so as to separate the pattern structure into a middle pattern rib (21) and two shoulder pattern ribs (22) respectively located on both sides of the middle pattern rib (21); A plurality of transverse grooves (12), the plurality of transverse grooves (12) being arranged at intervals along the circumferential direction of the tire, each of the transverse grooves (12) comprising a middle transverse groove (121) and two shoulder transverse grooves (122) respectively connected to both ends of the middle transverse groove (121), so as to separate the middle tread strip (21) into a plurality of middle tread blocks (210), and separate each of the shoulder tread strips (22) into a plurality of shoulder tread blocks (220), and the plurality of shoulder tread blocks (220) being arranged one by one directly opposite to the plurality of middle tread grooves (121); Each of the shoulder pattern blocks (220) and the two middle pattern blocks (210) located on opposite sides of the middle transverse groove (121) directly facing the shoulder pattern block (220) together form a polygonal groove (13) for receiving and placing stones.

2. The tire according to claim 1, characterized in that The groove wall surface of the polygonal groove (13) comprises: A first wall surface (1301) and a second wall surface (1302), wherein the first wall surface (1301) and the second wall surface (1302) are both partial block side wall surfaces of one of the two corresponding middle pattern blocks (210), and the first wall surface (1301) and the second wall surface (1302) are respectively arranged close to the other of the two corresponding middle pattern blocks (210) and the corresponding shoulder pattern block (220); A third wall surface (1303), the third wall surface (1303) being a partial block side wall surface of the other middle block (210) of the corresponding two middle blocks (210), and the third wall surface (1303) is arranged close to the corresponding shoulder block (220); a fourth wall surface (1304) and a fifth wall surface (1305), wherein the fourth wall surface (1304) and the fifth wall surface (1305) are both partial tread block side wall surfaces of the corresponding shoulder tread blocks (220), and the fourth wall surface (1304) and the fifth wall surface (1305) are respectively arranged close to the corresponding two middle tread blocks (210); Among them, the fourth wall surface (1304) is located on the side of the fifth wall surface (1305) away from the third wall surface (1303), the second wall surface (1302) is located on the side of the first wall surface (1301) away from the third wall surface (1303), and the first wall surface (1301) and the fourth wall surface (1304) are arranged opposite to each other.

3. The tire according to claim 2, characterized in that The angle between the second wall surface (1302) and the third wall surface (1303) is 40° to 70°; and / or The angle between the third wall surface (1303) and the fifth wall surface (1305) is 40° to 70°; and / or The included angle between the second wall surface (1302) and the fifth wall surface (1305) is 40° to 70°.

4. The tire according to claim 2 or 3, characterized in that The shape of the polygonal groove (13) is determined by a first point (131), a second point (132), a third point (133) and a fourth point (134); The first point (131) is located on the intersection line between the first wall surface (1301) and the second wall surface (1302); The second point (132) is located on an intersection line between a side of the third wall surface (1303) close to the second wall surface (1302) and a side wall surface connected to the third wall surface (1303); The third point (133) is located on an intersection line between a side of the fifth wall surface (1305) away from the fourth wall surface (1304) and a side wall surface connected to the fifth wall surface (1305); The fourth point (134) is located on the intersection line between the fourth wall surface (1304) and the fifth wall surface (1305); The relationship between the first point (131), the second point (132), the third point (133) and the fourth point (134) is: The projection distance from the first point (131) to the circumferential center line (15) of the tire is a, the projection distance from the second point (132) to the circumferential center line (15) of the tire is b, the projection distance from the third point (133) to the circumferential center line (15) of the tire is c, and the projection distance from the fourth point (134) to the circumferential center line (15) of the tire is d, where a and d are selected by the designer, p=90, q=50.

5. The tire according to claim 1, characterized in that The circumferential groove (11) comprises a plurality of circumferential groove segments (111), each of the circumferential groove segments (111) comprises a first groove body (1111) and a second groove body (1112) connected to each other, the angle between the first groove body (1111) and the second groove body (1112) being an obtuse angle; the length of the first groove body (1111) is greater than the length of the second groove body (1112); and / or The middle transverse groove (121) is a centrally symmetrical structure, the two shoulder transverse grooves (122) are centrally symmetrically arranged about the symmetry center of the corresponding middle transverse groove (121), and the angles between each shoulder transverse groove (122) and the corresponding middle transverse groove (121) are all obtuse angles.

6. The tire according to claim 5, characterized in that A transverse groove protrusion (1210) is provided on the bottom surface of the middle transverse groove (121), and the height of the transverse groove protrusion (1210) is less than the depth of the middle transverse groove (121); and / or A circumferential groove protrusion (1110) is provided on the bottom surface of the second groove body (1112), and the height of the circumferential groove protrusion (1110) is smaller than the depth of the second groove body (1112).

7. The tire according to claim 1, characterized in that The width of the middle transverse groove (121) is w121, and the width of the circumferential groove (11) is w11; wherein w40=w512; or w121 / w11=1 to 1.1; and / or The depth of the middle transverse groove (121) is h121, and the depth of the circumferential groove (11) is h11; wherein h121=h11; and / or The width of at least part of the shoulder transverse groove (122) gradually increases in a direction away from the middle rib (21); and / or The depth of at least a portion of the shoulder transverse groove (122) gradually decreases in a direction away from the middle rib (21).

8. The tire according to claim 1, characterized in that The pattern structure comprises a plurality of fine grooves (14), and the plurality of fine grooves (14) comprises: An intermediate fine groove (141), each of the intermediate pattern blocks (210) is provided with the intermediate fine groove (141), and both ends of the intermediate fine groove (141) are respectively connected to the two circumferential grooves (11); and / or A shoulder fine groove (142), each of the shoulder pattern blocks (220) is provided with the shoulder fine groove (142), one end of the shoulder fine groove (142) is connected to the corresponding middle transverse groove (121), and the other end of the shoulder fine groove (142) extends in a direction away from the middle pattern strip (21).

9. The tire according to claim 8, characterized in that A middle fine groove protrusion (1410) is provided on the bottom surface of the middle fine groove (141), and the height of the middle fine groove protrusion (1410) is smaller than the depth of the middle fine groove (141); and / or A shoulder fine groove protrusion (1420) is arranged on the groove bottom surface of the shoulder fine groove (142), and the height of the shoulder fine groove protrusion (1420) is smaller than the depth of the shoulder fine groove (142).

10. The tire according to claim 8, characterized in that The depth of the fine groove (14) is h14, and the depth of the circumferential groove (11) is h11, wherein h14 / h11=0.5 to 0.8; and / or The width of the fine groove (14) is w14, and the distance between two adjacent transverse grooves (12) is L12, wherein w14 / L12=0.02 to 0.07.

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