Four-season tire

Abstract

Main grooves are formed in a main tread of the four-season tire, and tire strips are formed between the adjacent main grooves; the roots of the tire strips are connected with the tire shoulder on one side of the main tread, the tips of the tire strips extend towards the tire shoulder on the other side of the main tread, the tire strips are divided into a water cutting tire strip, a water diversion tire strip and a water guide tire strip, the tips of the water cutting tire strip extend from one side of a circumferential center line to the other side of the circumferential center line, and the tips of the water diversion tire strip extend from the other side of the circumferential center line. The tip ends of the water diversion tire strips and the tip ends of the water guide tire strips are flush with the circumferential center line; the water cutting tire strips and the water diversion tire strips located on the same side of the circumferential center line are alternately arranged, and a water guide tire strip is arranged between any adjacent water cutting tire strip and water diversion tire strip located on the same side of the circumferential center line. And the water cutting tire strips and the water diversion tire strips on the different sides of the circumferential center line are arranged in a one-to-one correspondence and aligned manner and are in tip clearance fit. The four-season tire has excellent driving performance on dry land, wet land and ice and snow covered roads.

Description

Technical Field

[0001] The invention relates to the technical field of all-season tires for vehicles, and in particular to an all-season tire. Background Art

[0002] Tires are the only part of a vehicle that comes into contact with the ground during normal driving. Their performance has a decisive impact on the vehicle's driving state and performance in many aspects, such as starting, braking, gripping, and handling. As users' demands for vehicle driving performance continue to increase, and as the working conditions of vehicles are different in daily use, people's performance demands for all-season tires that can cope with various climate conditions and vehicle use environments throughout the year are also increasing.

[0003] At present, the industry's judgment on the performance of an all-season tire is usually based on a comprehensive assessment of the tire's dry performance, wet performance, snow performance, ice performance, noise, wear, rolling resistance and other aspects. With the continuous development of climate change in recent years, the performance requirements for all-season tires in daily vehicle use are not only limited to their ability to take into account winter ice and snow road conditions, but also put forward higher requirements for the comprehensive performance of all-season tires on dry, wet and ice and snow roads.

[0004] Accordingly, in the current design and development process of all-season tires, in order to make all-season tires have good performance on snow, multiple sipes are set on the tread to improve their snow-biting performance and thereby improve their driving stability on snow. In addition, in order to make all-season tires have good driving performance on dry land, the contact area of ​​the tread and other parts of the all-season tire is generally increased to increase the friction between the all-season tire and the ground, thereby improving its braking performance on dry land.

[0005] However, although the above-mentioned existing all-season tire tread design layout can meet the basic working conditions at this stage, in terms of tire structural performance, the increase of sipe patterns will lead to a decrease in the pattern rigidity of the tread and other ground-contacting parts of the all-season tire, thereby causing the handling stability of the all-season tire on dry ground to deteriorate; and if the ground-contacting area of ​​the tread is increased in order to improve the dry ground driving performance of the all-season tire, the effective area of ​​the groove structure such as the sipes on the tread will be reduced, thereby weakening the groove structure on the tread of the all-season tire for the discharge of ice, snow and rainwater, resulting in a corresponding decrease in the driving performance of the all-season tire on icy and snowy roads and rainy and snowy weather, which has an adverse effect on the all-season driving performance of the all-season tire.

[0006] In view of this, how to optimize the tread structure layout of all-season tires to improve their driving performance on dry land, wet land and icy and snowy roads is an important technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0007] The purpose of the present invention is to provide an all-season tire, which has excellent driving performance on dry land, wet land and icy and snowy roads.

[0008] In order to solve the above technical problems, the present invention provides a four-season tire, comprising a main tread extending in the circumferential direction and shoulders located on both sides of the main tread, characterized in that a plurality of main grooves extending from the edge portions on both sides of the main tread to the middle thereof are recessed on the main tread, a bead contacting the ground is formed between two adjacent main grooves, the main grooves located on the same side of the circumferential center line of the main tread are uniformly distributed in parallel along the circumference of the main tread with the circumferential center line of the main tread as a reference, the main grooves located on the same side of the circumferential center line are uniformly distributed along the circumference of the main tread, and the main grooves located on both sides of the circumferential center line are staggered and cross-arranged, and the inner ends of two main grooves located on the opposite sides of the circumferential center line and adjacent to each other along the circumference of the main tread intersect at the middle of the main tread;

[0009] Taking a straight line extending in the axial direction of the tire through any point of the outer end of the center line of the main groove as the axial reference line, the distance between the center line of the main groove and the axial reference line increases from the outer end to the inner end of the main groove;

[0010] The root of the tire strip is connected to the shoulder on one side of the main tread, and the tip of the tire strip extends toward the shoulder on the other side of the main tread. The tire strip is divided into a water-cutting tire strip, a water-dividing tire strip and a water-conducting tire strip. The tip of the water-cutting tire strip extends from one side of the circumferential center line to the other side of the circumferential center line. The tip of the water-dividing tire strip and the tip of the water-conducting tire strip are both flush with the circumferential center line.

[0011] The water-cutting strips and the water-dividing strips located on the same side of the circumferential centerline are arranged alternately, and one water-conducting strip is provided between any adjacent water-cutting strips and water-dividing strips located on the same side of the circumferential centerline;

[0012] The water-cutting strips located on the opposite sides of the circumferential centerline are arranged in a one-to-one correspondence with the water-dividing strips and the tip gaps are matched.

[0013] Preferably, a convex bottom reinforcing rib is connected between the water-cutting strip and the water-dividing strip which are located on the opposite sides of the circumferential centerline and correspond one to one, the top surface of the convex bottom reinforcing rib is higher than the inner wall of the bottom of the main groove and lower than the top outer wall of the water-cutting strip, and the side walls of the water-cutting strip, the side walls of the water-dividing strip and the top surface of the convex bottom reinforcing rib form a pressure relief groove connecting the two adjacent main grooves.

[0014] Preferably, the angle between the center line of the bottom of the pressure relief groove and the circumferential center line is 27°~33°.

[0015] Preferably, the tire strip includes an outer extension segment and an inner extension segment which are arranged and connected in sequence from its root to its tip, and both the outer extension segment and the inner extension segment are arc-shaped extension structures, and the ratio of the arc radius of the inner extension segment to the arc radius of the outer extension segment is 0.16~0.25.

[0016] Preferably, a transverse knife groove is recessed on the top outer wall of the tire strip, and the transverse knife groove is connected between two adjacent main grooves located on the same side of the circumferential center line.

[0017] Preferably, two transverse knife grooves are provided on the same tire strip, and the ratio of the depth of the transverse knife groove near the tip of the tire strip to the depth of the transverse knife groove near the root of the tire strip is 0.09~0.19.

[0018] Preferably, two transverse knife grooves located on the same tire strip divide the tire strip into three support segments arranged in sequence along the main extension direction of the tire strip, and a longitudinal knife groove extending along the main extension direction of the tire strip is recessed on the top outer wall of any of the support segments, and the longitudinal knife grooves located on the same tire strip are connected.

[0019] Preferably, on the same tire strip, the longitudinal knife groove located near the tip of the tire strip and the longitudinal knife groove located in the middle of the tire strip both have a turning section, the turning section is located in the middle of the longitudinal knife groove, and the midline of the length direction of the turning section is perpendicular to the arc of the inner extension section of the main groove adjacent to the longitudinal knife groove.

[0020] Preferably, the width of the main groove increases from its tip to its root, and the ratio of the tip width of the main groove to its root width is 0.62-0.67.

[0021] Preferably, an auxiliary groove is recessed on the top outer wall of the tire strip, and the auxiliary groove is arranged near the root of the tire strip.

[0022] Compared with the above-mentioned background technology, the all-season tire provided by the present invention, after being assembled to the vehicle body, during the driving process of the vehicle, the tip of the same tire strip contacts the ground before its root, so that when driving on a slippery road, the tip of the water-cutting tire strip can cut the water film on the ground when it contacts the ground, so that a part of the accumulated water on the ground surface is pressed into the main groove on the side of the water-cutting tire strip and then gradually flows toward the shoulder along the extension direction of the main groove until it is discharged from the main tread structure through the groove mouth at the junction of the main groove and the shoulder; at the same time, the water-dividing tire strip and the water-conducting tire strip can also cooperate with the main groove on their side, so as to guide the surface water formed after the water-cutting tire strip destroys the water film to its root through the tips of the water-dividing tire strip and the water-conducting tire strip, so that the accumulated water pressed into the main groove can be smoothly conducted along the main groove and finally discharged from the main tread through the groove mouth at the junction of the main groove and the shoulder. In addition, by using the coordinated cooperation and arrangement of the water-cutting tread strips, the water-dividing tread strips and the water-conducting tread strips, the contact area between the main tread and the ground can be fully guaranteed, thereby ensuring the grip and braking performance of the all-season tire on dry roads, and by using the alternating arrangement and coordinated cooperation of each tread strip and each main groove, the snow-biting ability of the all-season tire when driving on icy and snowy roads and the snow-discharging ability of the main tread can be effectively guaranteed, thereby improving the grip and braking performance of the all-season tire on icy and snowy roads. As a result, the driving stability and braking reliability of the vehicle equipped with the all-season tire described in this solution on dry land, wet land and icy and snowy roads can be correspondingly optimized.

[0023] In another preferred embodiment of the present invention, a convex bottom reinforcing rib is connected between the water-cutting strip and the water-dividing strip, which are located on the opposite sides of the circumferential centerline and correspond to each other. The top surface of the convex bottom reinforcing rib is higher than the inner wall of the bottom of the main groove and lower than the outer wall of the top of the water-cutting strip. The side wall of the water-dividing strip, the side wall of the water-dividing strip and the top surface of the convex bottom reinforcing rib form a pressure relief groove connecting two adjacent main grooves. The convex bottom reinforcing rib can significantly improve the structural strength of the junction between the water-cutting strip and the water-dividing strip tip, thereby further improving the structural reliability of the entire main tread and the contact and matching effect with the ground. On this basis, the pressure relief groove formed by the convex bottom reinforcement ribs respectively cooperating with the water-dividing tread strip and the water-cutting tread strip can be used as a connecting structure between two adjacent main grooves located on both sides of the water-cutting tread strip and the water-dividing tread strip, so as to further optimize the circulation and discharge effect of the accumulated water and ice and snow on the main tread between the main grooves, thereby further improving the driving performance such as the grip and braking force of the all-season tire on rainy and snowy roads, and making the vehicles equipped with the all-season tires drive more smoothly and safely on rainy and snowy roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the main tread structure of a four-season tire provided by a specific embodiment of the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of part E in the middle.

[0027] in:

[0028] 101-extension section; 102-inner extension section; 103-transverse knife groove; 104-support section; 105-vertical knife groove; 106-bending section; 107-auxiliary groove;

[0029] 11-cut the water tire strips;

[0030] 12-water-dividing tire strip;

[0031] 13-water-conducting tire strip;

[0032] 14- convex bottom reinforcement rib; 141- pressure relief groove;

[0033] 20-main tread; 201-tread shoulder; 202-main groove. DETAILED DESCRIPTION

[0034] The core of the present invention is to provide an all-season tire, which has excellent driving performance on dry land, wet land and icy and snowy roads.

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Furthermore, in the present invention, unless explicitly specified and limited otherwise, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features not being in direct contact with each other but being in contact with each other through another feature therebetween.

[0038] In addition, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] Please refer to Figure 1 and Figure 2 .

[0040] In a specific embodiment, the all-season tire provided by the present invention includes a main tread 20 extending in the circumferential direction and shoulders 201 located on both sides of the main tread 20. The main tread 20 is recessed with a plurality of main grooves 202 extending from the edge portions on both sides of the main tread 20 to the middle thereof. A tread strip in contact with the ground is formed between two adjacent main grooves 202. Taking the circumferential center line CL of the main tread 20 as a reference, the main grooves 202 located on the same side of the circumferential center line CL are evenly distributed in parallel along the circumference of the main tread 20, and the main grooves 202 located on both sides of the circumferential center line CL are staggered and cross-arranged, and the inner ends of the two main grooves 202 located on the opposite sides of the above-mentioned circumferential center line CL and adjacent to each other along the circumference of the main tread 20 intersect at the middle of the main tread 20.

[0041] Taking a straight line extending axially along the tire through any point of the outer end of the center line of the main groove 202 as the axial reference line, the distance between the center line of the main groove 202 and the axial reference line increases from the outer end to the inner end of the main groove 202.

[0042] The root of the tire strip is connected to the shoulder 201 located on one side of the main tread 20, and the tip of the tire strip extends toward the shoulder 201 located on the other side of the main tread 20. The tire strip is divided into a water-cutting tire strip 11, a water-dividing tire strip 12 and a water-conducting tire strip 13. The tip of the water-cutting tire strip 11 extends from one side of the circumferential center line CL to the other side of the circumferential center line CL, and the tips of the water-dividing tire strip 12 and the water-conducting tire strip 13 are both flush with the circumferential center line CL.

[0043] The water-cutting strips 11 and the water-dividing strips 12 on the same side of the circumferential center line CL are arranged alternately, and a water-conducting strip 13 is provided between any adjacent water-cutting strips 11 and water-dividing strips 12 on the same side of the circumferential center line CL; the water-cutting strips 11 and water-dividing strips 12 on the opposite sides of the circumferential center line CL are arranged in a one-to-one correspondence and the tip clearances are matched.

[0044] In a specific application process, after the all-season tire provided in the present solution is assembled to the vehicle body, during the driving process of the vehicle, the tip of the same tire strip touches the ground before its root, so that when driving on a slippery road, the tip of the water-cutting tire strip 11 can cut the water film on the ground when it touches the ground, so that a part of the accumulated water on the ground surface is pressed into the main groove 202 on the side of the water-cutting tire strip 11, and then gradually flows toward the shoulder 201 along the extension direction of the main groove 202, until it passes through the main groove 202 and the shoulder 201. 01 is discharged from the main structure of the main tread 20; at the same time, the water-dividing strip 12 and the water-conducting strip 13 can also cooperate with the main groove 202 on its side, so that the surface water formed after the water-cutting strip 11 destroys the water film can be guided to its root through the tip of the water-dividing strip 12 and the water-conducting strip 13 respectively, so that the accumulated water pressed into the main groove 202 can be smoothly guided along the main groove 202 and finally discharged from the main tread 20 from the groove mouth where the main groove 202 and the shoulder 201 are connected.

[0045] In addition, by utilizing the coordinated cooperation and arrangement of the water-cutting tread strip 11, the water-dividing tread strip 12 and the water-conducting tread strip 13, the contact area between the main tread 20 and the ground can be fully guaranteed, thereby ensuring the grip and braking performance of the all-season tire on dry roads, and by utilizing the alternating arrangement and coordinated cooperation of each tread strip and each main groove 202, the snow-biting ability of the all-season tire when driving on icy and snowy roads and the snow-discharging ability of the main tread 20 can be effectively guaranteed, thereby improving the grip and braking performance of the all-season tire on icy and snowy roads.

[0046] As a result, the driving stability and braking reliability of the vehicle equipped with the all-season tires described in this solution on dry land, wet land and icy and snowy roads can be optimized accordingly.

[0047] In specific applications, the extended structure of the water-cutting strip 11 from the root to the tip enables its tip to pass through the circumferential center line CL, so that during the rolling contact between the main tread 20 and the ground, the tip of the water-cutting strip 11 can be used as the core part to break the surface water film, so that the main tread 20 can cut and destroy the water film formed by the accumulated water on the surface more efficiently, and the driving effect on flooded roads is better.

[0048] It is not difficult to understand that, under normal circumstances, after the all-season tire is assembled on the vehicle, its main rolling direction corresponds to the forward direction of the vehicle, that is, the statement mentioned in this solution that the tip of the tire strip contacts the ground before its root is usually based on the fact that the assembly direction of the all-season tire on the whole vehicle is matched with the rolling operation in the forward direction of the vehicle. Of course, if there are special assembly application requirements under actual working conditions, the main rolling direction of the all-season tire can also correspond to the non-forward direction of the vehicle, and the staff can flexibly select and adjust according to the specific working conditions.

[0049] In addition, it should be emphasized that the water-cutting strip 11, the water-dividing strip 12 and the water-conducting strip 13 mentioned in the present scheme all belong to the strip structure arranged on the main tread 20 in the present scheme and cooperating with the main groove 202. The three are only slightly different in local details such as the tip. The main structure of each type of strip itself has basically the same structural characteristics. If the specific type of strip is not specially specified in the relevant statements and records in this article, it is assumed to refer to all types of strips arranged on the main tread 20 of the all-season tire in the present scheme.

[0050] Specifically, a convex bottom reinforcing rib 14 is connected between the water-cutting tread strip 11 and the water-dividing tread strip 12, which are located on the opposite sides of the circumferential center line CL and correspond to each other. The top surface of the convex bottom reinforcing rib 14 is higher than the inner wall of the bottom of the main groove 202 and lower than the outer wall of the top of the water-cutting tread strip 11. The side walls of the water-cutting tread strip 11, the side walls of the water-dividing tread strip 12 and the top surface of the convex bottom reinforcing rib 14 enclose a pressure relief groove 141 connecting two adjacent main grooves 202. The convex bottom reinforcing rib 14 can significantly improve the structural strength of the junction between the tip of the water-cutting tread strip 11 and the water-dividing tread strip 12, thereby further improving the structural reliability of the entire main tread 20 and the contact and matching effect with the ground.

[0051] On this basis, the pressure relief groove 141 formed by the convex bottom reinforcement rib 14 and the water-dividing tread strip 12 and the water-cutting tread strip 11 can be used as a connecting structure between two adjacent main grooves 202 located on both sides of the water-cutting tread strip 11 and the water-dividing tread strip 12, so as to further optimize the circulation and discharge effect of the accumulated water and ice and snow on the main tread 20 between the main grooves 202, thereby further improving the driving performance of the all-season tire on rainy and snowy roads, such as grip and braking force, and making the driving of vehicles equipped with all-season tires on rainy and snowy roads more stable and safe.

[0052] Generally, the angle α between the groove bottom centerline of the pressure relief groove 141 and the circumferential centerline CL is 27° to 33°. This angle value range can further improve the structural strength of the convex bottom reinforcement rib 14, so that the overall structural rigidity of the water-cutting tread strip 11 and the water-dividing tread strip 12 and other related matching tread strips can be correspondingly improved, thereby further ensuring the stability and control reliability of the vehicle equipped with the all-season tire described in this solution under high-speed driving conditions.

[0053] On the other hand, the tire strip includes an outer extension section 101 and an inner extension section 102 which are arranged and connected in sequence from the root to the tip, and both the outer extension section 101 and the inner extension section 102 are arc-shaped extension structures, and the ratio of the arc radius of the inner extension section 102 to the arc radius of the outer extension section 101 is 0.16-0.25. This variable diameter extension structure formed by connecting two arc sections helps to further improve the longitudinal and transverse structural rigidity of the tire strip, thereby correspondingly improving the structural strength of the main tread 20 along the tire axial direction and axial direction, so that the stability and tracking performance of the all-season tire in contact with the ground and during rolling can be correspondingly improved, and the driving process of the vehicle equipped with the all-season tire can be more stable and safe, and the driving experience can be correspondingly optimized.

[0054] On this basis, a transverse knife groove 103 is recessed on the top outer wall of the tire strip, and the transverse knife groove 103 is connected between two adjacent main grooves 202 located on the same side of the circumferential center line CL. Generally, the width of the transverse knife groove 103 is 0.8~1.3mm, and two transverse knife grooves 103 are arranged on the same tire strip, and the ratio of the depth of the transverse knife groove 103 near the tip of the tire strip to the depth of the transverse knife groove 103 near the root of the tire strip is 0.09~0.19. In this way, by utilizing the coordinated cooperation between each transverse knife groove 103 and each corresponding main groove 202, combined with the coordinated arrangement of each tire strip, the water film breaking effect and the corresponding drainage capacity when the main tread 20 contacts the wet road surface can be further improved, so that the wetland performance of the all-season tire can be further improved, and thus the wetland driving ability of the vehicle equipped with the all-season tire described in this scheme can be correspondingly optimized.

[0055] More specifically, two transverse blade grooves 103 on the same tire strip divide the tire strip into three support segments 104 arranged in sequence along the main extension direction of the tire strip, and a longitudinal blade groove 105 extending along the main extension direction of the tire strip is recessed on the top outer wall of any support segment 104, and the longitudinal blade grooves 105 on the same tire strip are connected. The longitudinal blade grooves 105 can further improve the snow-biting ability of the main tread 20, so that the rolling of the all-season tire on the icy and snowy road surface is more stable and reliable, and the driving safety and controllability of the vehicle equipped with the all-season tire on the icy and snowy road surface are correspondingly improved.

[0056] Furthermore, on the same tire strip, the longitudinal knife groove 105 located near the tip of the tire strip and the longitudinal knife groove 105 located in the middle of the tire strip both have an inflection section 106, the inflection section 106 is located in the middle of the longitudinal knife groove 105, and the midline of the longitudinal direction of the inflection section 106 is perpendicular to the arc of the inner extension section 102 of the main groove 202 adjacent to the longitudinal knife groove 105. The longitudinal direction of the inflection section 106 generally has a certain angle with the main extension direction of the longitudinal knife groove 105 where it is located, and the angle can be an acute angle, an obtuse angle, or a right angle. Based on the adaptation structure in which the turning section 106 and the inner extension section 102 are arranged vertically in the arc, and combined with the direct coordinated cooperation between the turning section 106 and the main structure of the longitudinal knife groove 105, the rigidity of the main structure such as the bead of the main tread 20 can be further improved, and the overall structural rigidity of the main tread 20 can be optimized accordingly, so that the rolling stability and tracking performance of the all-season tire can be further improved, and thereby the driving process of the vehicle equipped with the all-season tire described in this solution can be smoother and safer, and the handling performance and driving experience can be further optimized.

[0057] Correspondingly, a bending structure similar to the above-mentioned turning section 106 can also be arranged in the middle part of the transverse groove 103, so as to further optimize the structural rigidity of the adaptation tire strip portion near the transverse groove 103, thereby further optimizing the overall structural strength of the main tread 20, and improving the contact effect between the all-season tire and the road surface and the corresponding vehicle driving stability and safety.

[0058] In addition, the width of the main groove 202 increases from its tip to its root, and the ratio of the tip width of the main groove 202 to its root width is 0.62-0.67. Considering that the tip of the main groove 202 is usually located near the circumferential centerline CL of the main tread 20, the main groove 202 extension structure with increasing width from the center position to the edge position can further optimize the drainage and snow discharge effect of the main tread 20, so that the grip and braking force of the all-season tire on wet and icy roads can be further improved, so that the vehicle equipped with the all-season tire can be more reliable in handling on wet and icy roads, and the ride is safer and more comfortable.

[0059] In addition, an auxiliary groove 107 is recessed on the top outer wall of the tire strip. The auxiliary groove 107 is arranged near the root of the tire strip. The auxiliary groove 107 can be a serpentine groove or an arc groove, or a groove body of other shapes. Each auxiliary groove 107 can optimize the structural rigidity of the root of the tire strip accordingly, and can use each auxiliary groove 107 to connect two adjacent main grooves 202 on both sides of the tire strip, thereby further optimizing the drainage and snow discharge capacity of each main groove 202 at the groove mouth near the tire shoulder 201, thereby further improving the driving performance of the all-season tire on wetlands and icy and snowy roads, and making the driving of vehicles equipped with the all-season tire on wetlands and icy and snowy roads safer and more controllable.

[0060] In summary, it can be seen that the all-season tire provided in the present invention, after being assembled to the vehicle body, during the driving process of the vehicle, the tip of the same tire strip contacts the ground before its root, so that when driving on a slippery road, the tip of the water-cutting tire strip can cut the water film on the ground when it contacts the ground, so that a part of the accumulated water on the ground surface is pressed into the main groove on the side of the water-cutting tire strip and then gradually flows toward the shoulder along the extension direction of the main groove until it is discharged from the main tread structure through the groove mouth at the junction of the main groove and the shoulder; at the same time, the water-dividing tire strip and the water-conducting tire strip can also cooperate with the main groove on their side, so as to guide the surface water formed after the water-cutting tire strip destroys the water film to its root through the tips of the water-dividing tire strip and the water-conducting tire strip, so that the accumulated water pressed into the main groove can be smoothly conducted along the main groove and finally discharged from the main tread through the groove mouth at the junction of the main groove and the shoulder. In addition, by using the coordinated cooperation and arrangement of the water-cutting tread strips, the water-dividing tread strips and the water-conducting tread strips, the contact area between the main tread and the ground can be fully guaranteed, thereby ensuring the grip and braking performance of the all-season tire on dry roads, and by using the alternating arrangement and coordinated cooperation of each tread strip and each main groove, the snow-biting ability of the all-season tire when driving on icy and snowy roads and the snow-discharging ability of the main tread can be effectively guaranteed, thereby improving the grip and braking performance of the all-season tire on icy and snowy roads. As a result, the driving stability and braking reliability of the vehicle equipped with the all-season tire described in this solution on dry land, wet land and icy and snowy roads can be correspondingly optimized.

[0061] The above is a detailed introduction to the all-season tire provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A four-season tire, characterized in that: The tire comprises a main tread extending in the circumferential direction and shoulders located on both sides of the main tread, characterized in that a plurality of main grooves extending from the edge portions on both sides of the main tread to the middle thereof are recessed on the main tread, a tire strip in contact with the ground is formed between two adjacent main grooves, the main grooves located on the same side of the circumferential center line of the main tread are uniformly and parallelly distributed along the circumference of the main tread with the circumferential center line of the main tread as a reference, the main grooves located on the same side of the circumferential center line are staggered and cross-arranged, and the inner ends of two main grooves located on opposite sides of the circumferential center line and adjacent to each other along the circumference of the main tread intersect at the middle of the main tread; Taking a straight line extending in the axial direction of the tire through any point of the outer end of the center line of the main groove as the axial reference line, the distance between the center line of the main groove and the axial reference line increases from the outer end to the inner end of the main groove; The root of the tire strip is connected to the shoulder on one side of the main tread, and the tip of the tire strip extends toward the shoulder on the other side of the main tread. The tire strip is divided into a water-cutting tire strip, a water-dividing tire strip and a water-conducting tire strip. The tip of the water-cutting tire strip extends from one side of the circumferential center line to the other side of the circumferential center line. The tip of the water-dividing tire strip and the tip of the water-conducting tire strip are both flush with the circumferential center line. The water-cutting strips and the water-dividing strips located on the same side of the circumferential centerline are arranged alternately, and one water-conducting strip is provided between any adjacent water-cutting strips and water-dividing strips located on the same side of the circumferential centerline; The water-cutting strips located on the opposite sides of the circumferential centerline are arranged in a one-to-one correspondence with the water-dividing strips and the tip gaps are matched.

2. The all-season tire according to claim 1, characterized in that: A convex bottom reinforcing rib is connected between the water-cutting strip and the water-dividing strip which are located on the opposite sides of the circumferential centerline and correspond to each other. The top surface of the convex bottom reinforcing rib is higher than the inner wall of the bottom of the main groove and lower than the top outer wall of the water-cutting strip. The side walls of the water-cutting strip, the side walls of the water-dividing strip and the top surface of the convex bottom reinforcing rib form a pressure relief groove connecting the two adjacent main grooves.

3. The all-season tire according to claim 2, characterized in that: The angle between the center line of the bottom of the pressure relief groove and the circumferential center line is 27°~33°.

4. The all-season tire according to claim 1, characterized in that: The tire strip includes an outer extension segment and an inner extension segment which are sequentially arranged and connected from its root to its tip, the outer extension segment and the inner extension segment are both arc-shaped extension structures, and the ratio of the arc radius of the inner extension segment to the arc radius of the outer extension segment is 0.16-0.

25.

5. The all-season tire according to claim 4, characterized in that: A transverse knife groove is recessed on the top outer wall of the tire strip, and the transverse knife groove is connected between two adjacent main grooves located on the same side of the circumferential center line.

6. The all-season tire according to claim 5, characterized in that: Two transverse knife grooves are arranged on the same tire strip, and the ratio of the depth of the transverse knife groove near the tip of the tire strip to the depth of the transverse knife groove near the root of the tire strip is 0.09-0.

19.

7. The all-season tire according to claim 6, characterized in that: Two transverse knife grooves located on the same tire strip divide the tire strip into three support segments arranged in sequence along the main extension direction of the tire strip. A longitudinal knife groove extending along the main extension direction of the tire strip is recessed on the top outer wall of any of the support segments, and the longitudinal knife grooves located on the same tire strip are connected.

8. The all-season tire according to claim 7, characterized in that: On the same tire strip, the longitudinal knife groove located near the tip of the tire strip and the longitudinal knife groove located in the middle of the tire strip both have a turning section, the turning section is located in the middle of the longitudinal knife groove, and the midline of the length direction of the turning section is perpendicular to the arc of the inner extension section of the main groove adjacent to the longitudinal knife groove.

9. The all-season tire according to claim 1, wherein: The width of the main groove increases from its tip to its root, and the ratio of the tip width of the main groove to the root width is 0.62-0.

67.

10. The all-season tire according to claim 1, wherein: An auxiliary groove is recessed on the top outer wall of the tire strip, and the auxiliary groove is arranged near the root of the tire strip.

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