Tire

Abstract

The utility model provides a tire, the tread of the tire is provided with a pattern structure, the pattern structure is a central symmetry structure, and the pattern structure comprises two circumferential grooves which are arranged at intervals along the rotating 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 utility model relates to the technical field of tires, in particular to a tire. Background Art

[0002] Giant engineering machinery radial tires are used in open-pit mines around the world. Road conditions vary from place to place, depending on local climate, mine management, and the type of ore being mined.

[0003] A tire's wear resistance, heat resistance, and traction determine its service life, efficiency, and safety in a mine. In addition to the rubber formula, which can influence these properties, the tire's tread pattern also plays a significant role in heat resistance and traction.

[0004] The main tread grooves of a 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, tires also have secondary grooves (sipes), which can be longitudinal or transverse. They are characterized by being smaller in width and depth 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 mine's geological conditions, including factors such as surface conditions, rock type, and humidity; focusing on improving the tire's traction on different surfaces in the design to ensure that the dump truck can operate in various working conditions; ensuring that the pattern design can self-clean mud, ore, and other debris to prevent their accumulation and affect performance; and considering incorporating design elements into 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 multiple circumferential main grooves and multiple transverse grooves connected in the width direction extending continuously on the ground contact surface of the tread, so as to divide the pattern structure into multiple 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 is shallower in depth than the circumferential main groove, so as to divide the pattern block into multiple 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 is shallower in depth than the circumferential main groove.

[0007] The block truncation grooves and block auxiliary grooves in the aforementioned pneumatic construction vehicle tire effectively increase the tire's tread's heat dissipation surface area, providing more channels for air circulation, thereby improving the tire's heat resistance to a certain extent. However, excessive block division reduces the overall rigidity of the pattern structure. When used in mining environments with poorly maintained roads, abundant gravel, and slippery conditions, excessive tread groove divisions increase the risk of cuts, punctures, and stone trapping. Furthermore, the tire's tread saturation is reduced, resulting in a loss of wear resistance. Utility Model Content

[0008] The main purpose of the utility model is to provide a tire to solve the problems of the prior art tires used in open-pit mines, such as being more prone to cutting and puncture, stone trapping and reduced wear resistance due to excessive number of divided pattern grooves.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a tire is provided, wherein a pattern structure is provided on the tread of the tire, 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 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.

[0010] Furthermore, 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 walls 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 walls 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 and the third wall is 40° to 70°; and / or the angle between the third wall and the fifth wall is 40° to 70°; and / or the angle between the second wall and the fifth wall is 40° to 70°.

[0012] Furthermore, the shape of the polygonal groove is determined by a first point, a second point, a third point, and a 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 centerline of the tire is a, the projection distance from the second point to the circumferential centerline of the tire is b, the projection distance from the third point to the circumferential centerline of the tire is c, and the projection distance from the fourth point to the circumferential centerline of the tire is d. a and d are selected by the designer, p = 90, q = 50.

[0015] Furthermore, 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 intermediate transverse groove is a centrally symmetrical structure, the two shoulder transverse grooves are centrally symmetrically arranged about the symmetry center of the corresponding intermediate transverse groove, and the angles between each shoulder transverse groove and the corresponding intermediate transverse groove are both obtuse angles.

[0016] Furthermore, a transverse groove protrusion is provided on the bottom surface of the middle transverse groove, and the height of the transverse groove protrusion is less than the depth of the middle transverse groove; and / or a circumferential groove protrusion is provided on the bottom surface of the second groove body, and the height of the circumferential groove protrusion is less 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 rib; and / or the depth of at least part of the shoulder lateral groove gradually decreases in the direction away from the middle rib.

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

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

[0020] Furthermore, 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] Applying the technical solution of the present invention, a pattern structure is provided 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 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 setting two circumferential grooves and multiple transverse grooves, so that the traction, heat dissipation and stone discharge performance of the tire are improved, and the problems of tires used in open-pit mines in the prior art that are more prone to cutting and puncture, stone clamping and reduced wear resistance due to too many pattern grooves are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

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

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

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

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

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

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

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

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

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

[0033] Figure 11 Shown Figure 1 A comparison chart of the test data of the relationship between the first point, second point, third point and 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; 1302. Second wall; 1303. Third wall; 1304. Fourth wall; 1305. Fifth wall; 131. First point; 132. Second point; 133. Third point; 134. Fourth point;

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

[0039] 15. Tire circumferential centerline;

[0040] 21. Middle tread strip; 210. Middle tread block; 22. Shoulder tread strip; 220. Shoulder tread block. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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 utility model provides a tire, the tread of the tire is provided with a pattern structure, the pattern structure is a central symmetrical structure, 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 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 are arranged at intervals along the circumference of the tire, and each transverse groove 12 includes a middle transverse groove 121 and a partition groove 122. Two shoulder transverse grooves 122 are respectively connected to the two ends of the middle transverse groove 121 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 puncture, stone clamping and reduced wear resistance due to too many 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 pattern block side walls 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 pattern 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 pattern 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°; and 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°; and the angle between the second wall 1302 and the fifth wall 1305 is 55° to 60°.

[0049] like Figure 2 The figure shows an ideal structural diagram of the tire pattern structure of the present invention in a natural state or in a pressure-releasing state when the tire is off the ground. Figure 3 Shown is a schematic structural diagram of the tire pattern of the present invention when in a grounded and compressed state.

[0050] Depend on Figure 2 The polygonal groove 13 shown is Figure 3 The principle of the change of the polygonal groove 13 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 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 shoulder pattern block 220 both enter the ground contact area. Due to the load, they are compressed in the radial direction of the tire and then flattened when they are fully grounded. Due to the incompressibility of rubber, the pattern block sidewalls of the corresponding middle pattern block 210 and the pattern block sidewalls 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 grounded as the end point. The influence of the saturation of the tire tread on the traction depends on the shape of the tire when it is grounded.

[0052] Taking the embodiment of the present invention as an example, the instantaneous saturation of the tread is 87% when the tire contacts ground. If the tread structure of a conventional tire is used, the polygonal groove 13 will not exist at the moment of contact, but will be replaced by the tread, which has an instantaneous saturation of 92% when contact is made. The present invention improves the tire's grip by reducing the saturation of the tread by 5%, and correspondingly improves the grip affected by saturation by approximately 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 3The polygonal grooves 13 shown in the figure gradually decrease in volume, and the loose soil pressed into the grooves of the tread structure is gradually compacted to form columnar clumps. When the tire is about to lift off, the compacted columnar clumps create shear forces with the surrounding soil. When the shear forces reach a critical point, the columnar clumps are broken up. The force generated in this process also provides a favorable factor for improving the tire's traction.

[0054] Same as above, when the tire changes from not touching the ground to touching the ground, Figure 2 The polygonal groove 13 shown becomes Figure 3 The polygonal groove 13 shown has a gathering effect on gravel on the ground. Gravel that would otherwise be randomly embedded in any groove of the tread structure is instead forced toward the center of the polygonal groove 13 by the bulging deformation of the groove wall. When the tire is grounded, the polygonal groove 13 grips the gravel, and when the tire leaves the ground, the polygonal groove 13 releases the gravel.

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

[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 chosen by the designer, while p and q are coefficients to ensure the beneficial effects of the polygonal groove 13. The purpose of the coefficient p is to control the angle input range to ensure that the variation 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 derive the coefficient q. Each set of test data recorded the input a and d, as well as the experimentally measured b and c values ​​that meet the characteristics of the utility model. When analyzing the data, it was observed that the growth trends of a and d and b and c have a nonlinear relationship, which is consistent with exponential operation. Then, by fitting and analyzing a large amount of experimental data, the coefficient q was gradually adjusted, and the nonlinear least squares method (Levenberg-Marquardt algorithm) was 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. Figure 10 and Figure 11 The results show the fit between the a and d values ​​and the calculated b and c values. It can be seen that the theoretical formula fits the experimental data very closely, indicating that by 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 7As shown, the bottom surface of the middle lateral groove 121 is provided with a lateral groove protrusion 1210, the height of which is less than the depth of the middle lateral groove 121; and / or the bottom surface of the second groove body 1112 is provided with a circumferential groove protrusion 1110, the height of which 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 enhanced.

[0065] Specifically, 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 tread strip 21; and / or the depth of at least part of the shoulder transverse 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 Figure 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 middle fine groove 141 divides the corresponding middle pattern block 210 into two middle 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 groove 142 on the shoulder block 220 has its end near the tire circumferential centerline 15 located on the fifth wall 1305 of the polygonal groove 13, and its end away from the tire circumferential centerline 15 extends to the sidewall surface at the tire shoulder. In other words, the shoulder groove 142 connects the interior of the tread with the outside air. As the tire's tread gradually contacts the ground, the volume of the polygonal groove 13 gradually decreases, and when fully contacted with the road, it forms a closed space. The air within the polygonal groove 13 is compressed, and the pressure increases for a short period of time. At this time, only the shoulder groove 142 can discharge the compressed air from the interior of the polygonal groove 13 to the outside, generating high-speed air flow within the shoulder groove 142. As the tire gradually lifts off the ground, the volume of the polygonal groove 13 gradually expands, and when fully lifted off, it forms an open space. The air within the polygonal groove 13 is instantly diluted, and the pressure decreases for a short period of time. At this time, only the shoulder groove 142 can allow air to flow from the outside into the tread, generating high-speed air flow within the shoulder 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 to passively dissipate heat by increasing the surface area of ​​the tire pattern groove, but also allows a high-speed airflow to be formed inside the shoulder fine groove 142 to exchange heat with the outside world, thereby realizing active cooling of the groove surface of the pattern structure.

[0072] The beneficial effects of heat dissipation are further described as follows:

[0073] 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 convective heat dissipation and fluid convection flow and temperature difference can be expressed using the empirical formula for 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 intermediate fine grooves 141 on the intermediate pattern block 210 and shoulder fine grooves 142 on the shoulder pattern block 220, both of which are intended to enhance natural convection heat dissipation. Through calculation, it can be found that the provision of fine grooves 14 increases the surface area of ​​the tire by 13% compared to the case where fine grooves 14 are not provided, that is, the heat dissipation area A increases by 13%. For a single experimental object, the convective heat transfer coefficient h and the temperature difference ΔT are the same. According to the above formula, it can be calculated that the 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 in 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] Where Nu is the Nusselt number, which indicates the intensity of convective heat and mass transfer; Re is the Reynolds number, which indicates the relative magnitude of inertial and viscous forces; Pr is the Prandtl number, which indicates the relative magnitude of dynamic viscosity and heat transfer rate; C, m, and n are experimental constants. Increasing air velocity increases inertial forces and decreases viscous forces, which increases the Reynolds number (Re); increasing air velocity also increases dynamic viscosity, which decreases heat transfer rate due to the reduced time air spends on the groove wall, increasing the Prandtl number (Pr). According to the Nu-Sherwood number relationship, this increases the intensity of convective heat transfer, improving the tire tread surface's heat dissipation capacity.

[0079] like Figure 1 As shown, the bottom surface of the middle fine groove 141 is provided with a middle fine groove protrusion 1410, the height of which is less than the depth of the middle fine groove 141; and / or the bottom surface of the shoulder fine groove 142 is provided with a shoulder fine groove protrusion 1420, the height of which 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 enhanced.

[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 Figure 9 As shown, both ends of the middle fine groove protrusion 1410 and the corresponding groove bottom surface of the middle fine groove 141 as well as both 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 tread of the tire of the present invention is provided with a pattern structure, which is a centrally symmetrical structure. The pattern structure includes: two circumferential grooves 11, which are arranged at intervals along the rotation axis of the tire to separate the pattern structure into a middle pattern bar 21 and two shoulder pattern bars 22 located on both sides of the middle pattern bar 21; a plurality of transverse grooves 12, which are arranged at intervals along the circumference of the tire, and each transverse groove 12 includes a middle transverse groove 121 and a shoulder groove 22 located on both sides of the middle pattern bar 21; Two shoulder transverse grooves 122 connected at both ends of groove 121 divide the middle rib 21 into a plurality of middle tread blocks 210, and each shoulder rib 22 into a plurality of shoulder tread blocks 220. The plurality of shoulder tread blocks 220 are arranged one after another directly opposite the plurality of middle transverse grooves 121. Each shoulder tread block 220, together with two middle tread blocks 210 located on opposite sides of the middle transverse groove 121 directly facing the shoulder tread block 220, forms a polygonal groove 13 for receiving and releasing stones. Thus, the tire of the present invention, by providing two circumferential grooves 11 and a plurality of transverse grooves 12 to form a retractable and expandable polygonal groove 13, improves the tire's traction, heat dissipation, and stone removal performance. This solves the problems of existing tires used in open-pit mines, which are more susceptible to cuts, stone trapping, and reduced wear resistance due to excessive tread grooves.

[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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0090] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​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 drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0091] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline 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 herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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 merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection 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 includes: Two circumferential grooves (11), the two circumferential grooves (11) being arranged at intervals along the rotation axis of the tire 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 circumference 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 rib (21) into a plurality of middle tread blocks (210), and to separate each of the shoulder ribs (22) into a plurality of shoulder tread blocks (220), wherein the plurality of shoulder tread blocks (220) are arranged one by one opposite to the plurality of middle transverse 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, wherein The groove wall surface of the polygonal groove (13) includes: 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 pattern 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 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) being a partial pattern block side wall surface of the other one of the two corresponding middle pattern blocks (210), and the third wall surface (1303) being arranged close to the corresponding shoulder pattern 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); 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.

3. The tire according to claim 2, characterized in that 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 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 (1305) away from the fourth wall (1304) and a side wall connected to the fifth wall (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 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, where a and d are selected by the designer, p=90, and q=50.

5. The tire according to claim 1, wherein 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 centrosymmetrical structure, the two shoulder transverse grooves (122) are centrosymmetrically arranged about the symmetry center of the corresponding middle transverse groove (121), and the angle between each shoulder transverse groove (122) and the corresponding middle transverse groove (121) is an obtuse angle.

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, wherein 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 part of the shoulder transverse groove (122) gradually decreases in a direction away from the middle rib (21).

8. The tire according to claim 1, wherein The pattern structure includes a plurality of fine grooves (14), and the plurality of fine grooves (14) include: A middle fine groove (141), each of the middle pattern blocks (210) is provided with the middle fine groove (141), and both ends of the middle fine groove (141) are respectively connected to the two circumferential grooves (11); and / or A shoulder groove (142) is provided on each of the shoulder pattern blocks (220), one end of the shoulder groove (142) is connected to the corresponding middle transverse groove (121), and the other end of the shoulder groove (142) extends in a direction away from the middle pattern rib (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 groove protrusion (1420) is provided on the groove bottom surface of the shoulder groove (142), and the height of the shoulder groove protrusion (1420) is smaller than the depth of the shoulder 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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