Symmetrical tread structure and tire

Abstract

The utility model discloses a symmetrical type tread structure and tire relates to tire field, four main grooves of extending along the tread circumferential direction are spaced and parallelly arranged along the tread axial direction, and the tread is divided into center patterned rib, two side part patterned ribs on the both sides of center patterned rib and two shoulder patterned ribs, and two shoulder patterned ribs are located on the side of two side part patterned ribs away from center patterned rib, a plurality of Z shape's first groove on center patterned rib both ends extend along the tread axial direction, and the side wall of two main grooves adjacent to it is penetrated, a plurality of Z shape's second groove on side part patterned rib both ends extend along the tread axial direction, and the side wall of two main grooves adjacent to it is penetrated, and second groove and first groove are symmetrical and staggered arrangement, and a plurality of semi-closed groove on shoulder patterned rib penetrates the side wall of main groove adjacent to it, the utility model provides excellent driving comfort, dry and wet ground control stability and drainage performance, and reduces the driving noise.

Description

Technical Field

[0001] This utility model relates to the field of tire technology, and in particular to a symmetrical tread structure and tire. Background Technology

[0002] In the past, the performance focus of passenger car tires was mainly on wear resistance and load-bearing capacity. However, with the continuous advancement of automotive technology and the increasing awareness of vehicles among consumers, the market has placed more comprehensive performance demands on tires (the key component responsible for supporting weight and transmitting power). In particular, with the introduction of tire performance labeling regulations in various countries, tire noise performance, ride comfort, and safety performance under both dry and wet conditions have received increasing attention.

[0003] Generally, depending on different usage needs, passenger car tire tread patterns can be divided into large and small tread blocks based on size, and into symmetrical, asymmetrical, and directional patterns based on layout. Among them, small tread block designs are usually more advantageous in reducing tire noise and improving comfort, but may be less effective in handling performance on dry and wet roads; while large tread blocks are the opposite, providing better handling stability, but performing weaker in noise control and comfort.

[0004] Therefore, finding the optimal balance between various performance aspects—ensuring good driving comfort while maximizing tire handling stability on both dry and wet surfaces, and maintaining low noise levels—to design a tire product with excellent overall performance remains a core challenge for tire tread designers. Often, improving one aspect of the tread pattern's performance can restrict other aspects. Therefore, the key to tire design wisdom lies in comprehensively balancing the relationships between various performance characteristics and developing products that meet specific market demands. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a symmetrical tread structure and tire that can provide excellent ride comfort, good handling stability in both dry and wet conditions, and efficient water drainage performance, while reducing driving noise and rolling resistance.

[0006] The first aspect of this utility model provides a symmetrical tread structure, which includes a tread with four parallel main grooves. The four main grooves extend circumferentially along the tread and are spaced apart axially along the tread to divide the tread into a central tread rib, two side tread ribs, and two shoulder tread ribs. The two side tread ribs are located on both sides of the central tread rib, and the two shoulder tread ribs are located on the side of the two side tread ribs away from the central tread rib. The central tread rib is provided with a plurality of Z-shaped first grooves at intervals along its extension direction. The two ends of the first grooves extend along the axial direction of the tread and respectively penetrate the sidewalls of the two adjacent main grooves. The side tread ribs are provided with a plurality of Z-shaped second grooves at intervals along their extension direction. The two ends of the second grooves extend along the axial direction of the tread and respectively penetrate the sidewalls of the two adjacent main grooves. The second grooves are symmetrically arranged and staggered with the first grooves. The tire shoulder tread pattern has multiple semi-closed grooves spaced apart along its extension direction, and one end of each semi-closed groove passes through the sidewall of the adjacent main groove.

[0007] The symmetrical tread structure according to the first aspect of this utility model has at least the following beneficial effects: a Z-shaped first groove is provided on the central tread rib, and a Z-shaped second groove is provided on the side tread rib. Both ends of the first groove and both ends of the second groove can extend along the axial direction of the tread and penetrate the sidewall of the adjacent main groove. That is, the first groove is horizontally connected to the boundary of the central tread rib, and the second groove is horizontally connected to the boundary of the side tread rib. This can enhance the structural rigidity of the central tread rib and the side tread rib, thereby improving the tire's handling response and stability. Moreover, since both the first groove and the second groove adopt a Z-shaped structural design, the tread's cushioning characteristics can be optimized, effectively absorbing road impacts and vibrations, and synergistically reducing rolling noise, while ensuring the straight-line stability of the vehicle.

[0008] The first groove on the central tread rib and the second grooves on the side tread ribs are staggered. This staggered arrangement of the first and second grooves quickly breaks up the water film on wet surfaces, achieving excellent drainage performance at high speeds. It also enhances straight-line stability, optimizes ground stress distribution, and effectively improves tread wear uniformity. Semi-enclosed grooves are incorporated into the shoulder tread ribs. The closed structure at one end of these semi-enclosed grooves increases the rigidity of the shoulder tread ribs, enhancing tread grip. Simultaneously, the semi-enclosed grooves effectively block airflow in the shoulder area during driving, reducing road noise.

[0009] By applying the symmetrical tread structure designed above to tires, the tires can provide excellent ride comfort, good handling stability in both dry and wet conditions, and efficient water drainage performance, while reducing driving noise and rolling resistance.

[0010] In some embodiments of this utility model, the first groove includes a first oblique fine groove and two first transverse fine grooves located on both sides of the first oblique fine groove. The first transverse fine grooves extend axially along the tread and their two ends respectively penetrate the sidewall of the adjacent main groove and the first oblique fine groove. The second groove includes a second oblique fine groove and two second transverse fine grooves located on both sides of the second oblique fine groove. The second transverse fine grooves extend axially along the tread and their two ends respectively penetrate the sidewall of the adjacent main groove and the second oblique fine groove.

[0011] In some embodiments of this utility model, the first oblique fine groove and the second oblique fine groove are opposite in their inclination directions; the extension direction of the first oblique fine groove forms a first acute angle with the axial direction of the tread; the extension direction of the second oblique fine groove forms a second acute angle with the axial direction of the tread; and the second acute angle is equal to the first acute angle; and / or, The second grooves on the two side patterned ribs are arranged in a staggered manner.

[0012] In some embodiments of this utility model, all the first grooves are arranged at unequal intervals in the circumferential direction of the tire tread, and all the second grooves are arranged at unequal intervals in the circumferential direction of the tire tread.

[0013] In some embodiments of this utility model, the main groove is a widened groove, and the width of the two main grooves located in the middle position is equal to or greater than the width of the two main grooves located on both sides.

[0014] In some embodiments of this utility model, the bottom surface of the main groove is provided with multiple oblique pattern grooves, and the multiple oblique pattern grooves are arranged at intervals along the circumference of the tire tread.

[0015] In some embodiments of this utility model, the bottom surface of the main groove is provided with two sets of oblique patterned grooves at intervals along its width direction, and each set of oblique patterned grooves includes multiple oblique patterned grooves.

[0016] In some embodiments of this utility model, the semi-enclosed grooves on the two shoulder tread ribs are arranged symmetrically and staggered. The semi-enclosed grooves include oblique coarse grooves and V-shaped fine grooves. One end of the V-shaped fine groove is connected to the end of the oblique coarse groove near the central tread rib, and the other end penetrates the sidewall of the adjacent main groove.

[0017] In some embodiments of this utility model, the V-shaped fine groove includes a first long side groove and a second long side groove. The first long side groove is inclined and has the same inclination direction as the inclined coarse groove. One end of the first long side groove is connected to the inclined coarse groove, and the other end is connected to one end of the second long side groove. The second long side groove extends along the axial direction of the tread, and the other end of the second long side groove penetrates the sidewall of the adjacent main groove.

[0018] The second aspect of this utility model provides a tire, the tire having a symmetrical tread structure as described in the first aspect embodiment.

[0019] The tire according to the second aspect of the present invention has at least the following beneficial effects: by adopting the symmetrical tread structure with the above-mentioned unique structure, the tire can have excellent driving comfort, good handling stability in dry and wet conditions, and low driving noise, thus meeting the user's needs for tire use.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the symmetrical tread structure provided according to an embodiment of the present utility model; Figure 2 This is a physical illustration of a tire provided according to an embodiment of the present utility model. Figure 1 ; Figure 3 This is a physical illustration of a tire provided according to an embodiment of the present utility model. Figure 2 .

[0022] Reference numerals: 100, main groove; 110, oblique tread groove; 200, central tread rib; 210, first groove; 211, first oblique fine groove; 212, first transverse fine groove; 300, side tread rib; 310, second groove; 311, second oblique fine groove; 312, second transverse fine groove; 400, shoulder tread rib; 410, semi-enclosed groove; 411, oblique coarse groove; 412, V-shaped fine groove. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "several" means one or more, and "multiple" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The following is for reference. Figures 1 to 3 This invention describes a symmetrical tread structure and tire provided according to an embodiment of the present invention.

[0027] like Figures 1 to 3 As shown, the symmetrical tread structure according to the first aspect of the present invention can be applied to tires that travel on conventional paved roads (including urban roads and highways). It adopts a centrally symmetrical groove arrangement structure design, which has the advantages of excellent driving comfort, good handling stability in dry and wet conditions, and low driving noise level.

[0028] The symmetrical tread structure of this embodiment has circumferential and axial directions, wherein the circumferential direction is consistent with the circumference of the tire, the axial direction is consistent with the axial direction of the tire, and the axial direction is perpendicular to the circumferential direction. It is understood that... Figure 1 Only a partial structure of the symmetrical tread pattern is shown, where the longitudinal direction represents the symmetrical tread pattern in... Figure 1 The direction of extension in the middle is perpendicular to the axial direction.

[0029] like Figures 1 to 3As shown, the symmetrical tread structure includes a tread with four main grooves 100. Viewed along the axial direction of the tread, the four main grooves 100 form a ring. Specifically, the four main grooves 100 not only extend circumferentially along the tread to form a closed-loop structure, but also are arranged at certain intervals along the axial direction of the tread, so that the four main grooves 100 are arranged parallel to each other, dividing the tread into a central tread rib 200, two side tread ribs 300, and two shoulder tread ribs 400.

[0030] Two side tread ribs 300 are located on either side of the central tread rib 200, and are symmetrically arranged about the central tread rib 200 along the axial direction of the tread. Two shoulder tread ribs 400 are located on the side of the two side tread ribs 300 away from the central tread rib 200, with the side closer to the central tread rib 200 being the inner side and the side away from the central tread rib 200 being the outer side. The two shoulder tread ribs 400 are located on either side of the central tread rib 200, and are also located outside the side tread ribs 300.

[0031] The central tread rib 200 is provided with a plurality of first grooves 210 at intervals along its extension direction. The first grooves 210 are generally Z-shaped. The two ends of the first grooves 210 extend along the axial direction of the tread. The two ends of the first grooves 210 respectively penetrate the sidewalls of the two adjacent main grooves 100, that is, they respectively penetrate the two sidewalls of the central tread rib 200 and are respectively connected to the two main grooves 100 provided near the central tread rib 200.

[0032] In this embodiment, as Figures 1 to 3 As shown, the structure of the first groove 210 includes a first oblique fine groove 211 and a first lateral fine groove 212. There is one first oblique fine groove 211, which is inclined, meaning it forms an angle with the axial direction of the tread. There are two first lateral fine grooves 212, located on opposite sides of the first oblique fine groove 211 along the axial direction of the tread. The two lateral fine grooves 212 are connected to the first oblique fine groove 211 to form a Z-shaped groove structure. The first lateral fine groove 212 extends along the axial direction of the tread, and both ends of the first lateral fine groove 212 penetrate the sidewall of the adjacent main groove 100 and the first oblique fine groove 211, respectively. That is, one end of the first lateral fine groove 212 connects to the first oblique fine groove 211, and the other end connects to the adjacent main groove 100.

[0033] Each side tread rib 300 is provided with a plurality of second grooves 310 at intervals along its extension direction. The second grooves 310 are generally Z-shaped. The two ends of the second grooves 310 extend along the axial direction of the tread. Furthermore, the two ends of the second grooves 310 respectively penetrate the side walls of the two adjacent main grooves 100, that is, they respectively penetrate the two side walls of the side tread ribs 300 and are respectively connected to the two main grooves 100 provided near the side tread ribs 300.

[0034] In this embodiment, as Figures 1 to 3 As shown, the structure of the second groove 310 includes a second oblique fine groove 311 and a second lateral fine groove 312. There is one second oblique fine groove 311, which is inclined, meaning it forms an angle with the axial direction of the tread. There are two second lateral fine grooves 312, located on opposite sides of the second oblique fine groove 311 along the axial direction of the tread. The two lateral fine grooves 312 are connected to the second oblique fine groove 311 to form a Z-shaped groove structure. The second lateral fine groove 312 extends along the axial direction of the tread, and both ends of the second lateral fine groove 312 penetrate the sidewall of the adjacent main groove 100 and the second oblique fine groove 311, respectively. That is, one end of the second lateral fine groove 312 connects to the second oblique fine groove 311, and the other end connects to the adjacent main groove 100.

[0035] The second groove 310 is symmetrically arranged with the first groove 210, and the second groove 310 and the first groove 210 are staggered in the axial direction of the tread.

[0036] Specifically, the first oblique fine groove 211 and the second oblique fine groove 311 are opposite in their oblique direction. For example, Figure 1 The vertical direction is defined as the up-down direction, and... Figure 1 The axial direction is defined as the left-right direction. If the second oblique groove 311 slopes upward to the right, the first oblique groove 211 slopes upward to the left. The extension direction (or tilting direction) of the first oblique groove 211 forms a first acute angle with the axial direction of the tread, and the extension direction (or tilting direction) of the second oblique groove 311 forms a second acute angle with the axial direction of the tread. The second acute angle is equal to the first acute angle. The specific values ​​of the first and second acute angles are not limited and can be selected according to actual design requirements, such as designing the first and second acute angles to be 30°.

[0037] The widths of the first lateral fine grooves 212 and the second lateral fine grooves 312 range from 1 mm to 10 mm, and their lengths range from 3 mm to 20 mm. The widths of the first oblique fine grooves 211 and the second oblique fine grooves 311 range from 1 mm to 10 mm, and their lengths range from 10 mm to 40 mm. All the first grooves 210 on the central tread rib 200 and all the second grooves 310 on the two side tread ribs 300 together constitute the Z-shaped groove network on the tire tread.

[0038] It is understandable that the first oblique fine groove 211 and the second oblique fine groove 311 are arranged at a specific angle that is not parallel and is symmetrical to each other, so that the first oblique fine groove 211 and the second oblique fine groove 311 are centrally symmetrical. Through such a symmetrical angle design, the stress distribution in the tire's contact area can be optimized, the straight-line driving stability of the tire can be significantly enhanced, and the wear uniformity of the tread can be effectively improved.

[0039] In some embodiments, such as Figures 1 to 3 As shown, the second grooves 310 on the two side tread ribs 300 are staggered along the axial direction of the tread. Of course, it is not excluded that in other embodiments, the second grooves 310 on the two side tread ribs 300 are arranged sequentially at intervals along the axial direction of the tread.

[0040] The shoulder tread rib 400 is provided with a plurality of semi-closed grooves 410 at intervals along its extension direction. One end of the semi-closed groove 410 penetrates the side wall of the adjacent main groove 100. That is, one end of the semi-closed groove 410 penetrates the side wall of the shoulder tread rib 400 near the side tread rib 300 and connects to the main groove 100 provided near the shoulder tread rib 400. The other end of the semi-closed groove 410 is a closed structure.

[0041] In this embodiment, as Figures 1 to 3 As shown, the semi-enclosed grooves 410 on the two shoulder tread ribs 400 are centrally symmetrically arranged, and the semi-enclosed grooves 410 on the two shoulder tread ribs 400 are staggered in the axial direction of the tread. Specifically, the structure of the semi-enclosed grooves 410 includes oblique coarse grooves 411 and V-shaped fine grooves 412. One end of the V-shaped fine groove 412 is connected to the end of the oblique coarse groove 411 near the central tread rib 200, and the other end of the V-shaped fine groove 412 penetrates the side wall of the adjacent main groove 100. That is, the V-shaped fine groove 412 is located between the main groove 100 and the oblique coarse groove 411. One end of the V-shaped fine groove 412 is connected to the oblique coarse groove 411 to form a semi-closed groove 410. The other end of the V-shaped fine groove 412 penetrates the side wall of the shoulder tread rib 400 near the side tread rib 300 and is connected to the main groove 100 located near the shoulder tread rib 400.

[0042] More specifically, the structure of the V-shaped fine groove 412 includes a first long side groove and a second long side groove. The first and second long side grooves are connected at their ends to form the V-shaped fine groove 412. The first long side groove is inclined, and it is inclined in the same direction as the inclined coarse groove 411. One end of the first long side groove is connected to the inclined coarse groove 411, and the other end is connected to one end of the second long side groove. The second long side groove extends axially along the tread, and its other end penetrates the sidewall of the adjacent main groove 100.

[0043] The width of the V-shaped fine groove 412 ranges from 0.1 mm to 5 mm, and its length ranges from 5 mm to 20 mm. The width of the oblique coarse groove 411 ranges from 1 mm to 10 mm, and its length ranges from 20 mm to 90 mm. The oblique coarse groove 411 has a larger groove width than the V-shaped fine groove 412, the first groove 210, and the second groove 310.

[0044] For example, one of the shoulder tread ribs 400 has a sloping coarse groove 411 that slopes downwards to the right. Simultaneously, the first long side groove also slopes downwards to the right. The angle between the sloping coarse groove 411 and the axial direction of the tread is smaller than the angle between the first long side groove and the axial direction of the tread; that is, the slope of the first long side groove is greater than that of the sloping coarse groove 411. The left end of the second long side groove connects to the lower end of the first long side groove. At this time, the opening of the V-shaped fine groove 412 is open upwards.

[0045] Another shoulder tread rib 400 has a sloping coarse groove 411 that slopes downwards to the right. Simultaneously, the first long side groove also slopes downwards to the right. The angle between the sloping coarse groove 411 and the axial direction of the tread is smaller than the angle between the first long side groove and the axial direction of the tread; that is, the slope of the first long side groove is greater than that of the sloping coarse groove 411. The right end of the second long side groove connects to the upper end of the first long side groove. At this time, the opening of the V-shaped fine groove 412 is open downwards.

[0046] It is understood that in the symmetrical tread structure provided in the first aspect embodiment of this utility model, since a Z-shaped first groove 210 is provided on the central tread rib 200 and a Z-shaped second groove 310 is provided on the side tread rib 300, both ends of the first groove 210 and both ends of the second groove 310 can extend along the axial direction of the tread and penetrate the sidewall of the adjacent main groove 100. That is, the first groove 210 is horizontally connected to the boundary of the central tread rib 200, and the second groove 310 is horizontally connected to the boundary of the side tread rib 300. Therefore, it is possible to... This enhances the structural rigidity of the central tread rib 200 and the side tread rib 300, thereby improving the tire's handling response and stability. Moreover, since both the first groove 210 and the second groove 310 adopt a Z-shaped structural design, the first oblique fine groove 211 can connect with the first lateral fine grooves 212 on both sides, and the second oblique fine groove 311 can connect with the second lateral fine grooves 312 on both sides. This optimizes the tread's cushioning characteristics, effectively absorbs road impacts and vibrations, and synergistically reduces rolling noise, while ensuring the vehicle's straight-line stability.

[0047] In addition, since the first groove 210 on the central tread rib 200 and the second groove 310 on the side tread ribs 300 are arranged in a staggered manner, the staggered first groove 210 and second groove 310 can quickly break up the water film surface of the wet road surface, achieving excellent drainage performance at high speeds. At the same time, it can also enhance the straight-line driving stability of the tire, optimize the ground stress distribution, and effectively improve the wear uniformity of the tread.

[0048] Semi-enclosed grooves 410 are provided on the shoulder tread ribs 400. These semi-enclosed grooves 410 can divide the shoulder tread ribs 400 into multiple tread blocks. The V-shaped fine grooves 412 adopt a narrow V-shaped direction. On the one hand, they form a spatially staggered layout with the oblique coarse grooves 411, expanding the local deformation space of the tread blocks to optimize the uniformity of the contact patch and pressure distribution. On the other hand, the refined narrow groove design effectively suppresses rolling noise in the shoulder area. The oblique coarse grooves 411, which work in conjunction with the V-shaped fine grooves 412, adopt a closed design. The closed structure can significantly improve the rigidity of the tread blocks and enhance the tread's grip performance.

[0049] Therefore, the closed structure at one end of the semi-enclosed groove 410 enhances the rigidity of the shoulder tread ribs 400 and improves the tread grip performance; at the same time, the semi-enclosed groove 410 can effectively block the airflow direction of the shoulder during driving and reduce driving noise.

[0050] This invention applies the symmetrical tread structure designed above to tires, enabling them to provide excellent ride comfort, good handling stability in both dry and wet conditions, and efficient water drainage, while reducing driving noise and rolling resistance.

[0051] In some embodiments, such as Figures 1 to 3 As shown, all the first grooves 210 are spaced at unequal intervals in the circumferential direction of the tire tread, and all the second grooves 310 are spaced at unequal intervals in the circumferential direction of the tire tread. This design can reduce vibrations at fixed frequencies, prevent resonance from being transmitted to the vehicle, effectively improve ride smoothness, and ensure a more uniform pressure distribution when the tire contacts the ground, preventing localized premature tire wear, while also optimizing the tire's dry and wet grip performance.

[0052] In some embodiments, such as Figures 1 to 3 As shown, the main grooves 100 are widened grooves, with the width of the two main grooves 100 located in the middle being equal to or greater than the width of the two main grooves 100 located on either side. This widened design significantly increases the volume of the main grooves 100, thereby increasing the ratio of the non-contact area of ​​the main grooves 100 to the total contact area of ​​the tire. This increases the amount of water that can be drained per unit time, greatly improving the tire's drainage efficiency. This ensures that water can be quickly drained from the tire tread and road surface when driving on wet roads, effectively inhibiting water film formation and hydroplaning, and guaranteeing excellent wet grip.

[0053] In some embodiments, such as Figure 1 As shown, the bottom surface of the main groove 100 is provided with multiple oblique tread grooves 110, which are spaced apart along the circumference of the tire tread. In this embodiment, the bottom surface of the main groove 100 is provided with two sets of oblique tread grooves 110 spaced apart along its width direction, and each set of oblique tread grooves 110 includes multiple oblique tread grooves 110.

[0054] Understandably, by adopting such a structural design at the main groove 100, the oblique tread groove 110 can significantly enhance the drainage capacity of the main groove 100 when driving on wet and slippery roads, accelerate water flow, and thus improve drainage efficiency when driving on wet surfaces; it can also effectively break the regular airflow within the main groove 100, suppress the generation of tube resonance noise in the main groove 100, and improve the tire's noise performance; at the same time, it can also add a unique visual layer and design sense to the tire, thereby enhancing the aesthetics of the tire tread pattern.

[0055] The first aspect of this utility model aims to develop a professional tire for ordinary passenger cars, which adopts a centrally symmetrical tread pattern design. This symmetrical tread structure enables the tire to provide excellent driving comfort, good dry and wet handling stability, and efficient water drainage performance in urban roads and highway environments, while significantly reducing driving noise and rolling resistance.

[0056] This symmetrical tread structure is composed of 3 to 5 tread pitch units stacked circumferentially according to a simulation-optimized sequence. Each tread pitch unit contains pitches of varying widths and numbers, ranging from 10mm to 60mm in width and from 50 to 150 in number. It can be understood that tire pitch refers to the circumferential spacing between tread blocks or grooves on the tire tread.

[0057] The tread pattern of this invention adopts a centrally symmetrical variable pitch pattern unit layout design, which can significantly optimize the rigidity distribution of the tread. This not only enhances the overall grip performance of the tire, but also effectively disperses the pressure distribution in the contact patch area, thereby achieving a more balanced stress state, effectively alleviating local fatigue, and helping to improve the overall durability of the tire.

[0058] Four significantly widened main grooves 100 longitudinally divide the tread into a central tread rib 200, side tread ribs 300, and shoulder tread ribs 400. Special groove structures are designed for the central tread ribs 200, side tread ribs 300, and shoulder tread ribs 400. Specifically, a reasonable number and evenly spaced Z-shaped first groove 210 are provided on the central tread rib; a reasonable number and evenly spaced Z-shaped second groove 310 are provided on the side tread ribs 300; and a reasonable number and evenly spaced semi-enclosed groove, composed of oblique coarse grooves 411 and V-shaped fine grooves 412, is provided on the shoulder tread ribs 400. The closed grooves 410 enhance drainage efficiency through the widened four main grooves 100. The synergistic effect of the main grooves 100, the first groove 210, the second groove 310, and the semi-closed grooves 410 reduces noise transmission. The Z-shaped groove network formed by the first groove 210 and the second groove 310 improves tread rigidity to optimize dry and wet steering response. Combined with pitch distribution, it optimizes road contact frequency and improves noise levels. Ultimately, it achieves synergistic breakthroughs in multiple dimensions such as ride comfort, handling stability, quietness, and drainage, contributing to the development of safer, more balanced, more versatile, and more aesthetically pleasing high-end tires.

[0059] like Figures 1 to 3As shown, the tire provided according to the second aspect embodiment of this utility model can be used as a pneumatic tire for passenger cars, is suitable for conventional paved roads (including urban roads and highways), and has excellent driving comfort, dry and wet handling stability, and low driving noise level. The tire of this embodiment has a symmetrical tread structure as in the first aspect embodiment.

[0060] The tire provided in the second aspect of this utility model, by adopting the symmetrical tread structure with the above-mentioned unique structure, can have excellent driving comfort, good handling stability in dry and wet conditions, and low driving noise, thus meeting the user's needs for tire use.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A symmetrical tread structure, characterized in that, The tire includes a tread with four parallel main grooves. The four main grooves extend circumferentially along the tread and are spaced apart axially along the tread to divide the tread into a central tread rib, two side tread ribs, and two shoulder tread ribs. The two side tread ribs are located on both sides of the central tread rib, and the two shoulder tread ribs are located on the side of the two side tread ribs away from the central tread rib. The central tread rib is provided with a plurality of Z-shaped first grooves at intervals along its extension direction. The two ends of the first grooves extend along the axial direction of the tread and respectively penetrate the sidewalls of the two adjacent main grooves. The side tread ribs are provided with a plurality of Z-shaped second grooves at intervals along their extension direction. The two ends of the second grooves extend along the axial direction of the tread and respectively penetrate the sidewalls of the two adjacent main grooves. The second grooves are symmetrically arranged and staggered with the first grooves. The tire shoulder tread pattern has multiple semi-closed grooves spaced apart along its extension direction, and one end of each semi-closed groove passes through the sidewall of the adjacent main groove.

2. The symmetrical tread structure according to claim 1, characterized in that, The first groove includes a first oblique fine groove and two first transverse fine grooves located on both sides of the first oblique fine groove. The first transverse fine grooves extend axially along the tread and their two ends respectively penetrate the sidewall of the adjacent main groove and the first oblique fine groove. The second groove includes a second oblique fine groove and two second transverse fine grooves located on both sides of the second oblique fine groove. The second transverse fine grooves extend axially along the tread and their two ends respectively penetrate the sidewall of the adjacent main groove and the second oblique fine groove.

3. The symmetrical tread structure according to claim 2, characterized in that, The first oblique fine groove and the second oblique fine groove are opposite in their oblique directions. The extension direction of the first oblique fine groove forms a first acute angle with the axial direction of the tread, and the extension direction of the second oblique fine groove forms a second acute angle with the axial direction of the tread, the second acute angle being equal to the first acute angle; and / or, The second grooves on the two side patterned ribs are arranged in a staggered manner.

4. The symmetrical tread structure according to claim 3, characterized in that, All the first grooves are arranged at unequal intervals in the circumferential direction of the tire tread, and all the second grooves are arranged at unequal intervals in the circumferential direction of the tire tread.

5. The symmetrical tread structure according to claim 1, characterized in that, The main trench is a widened trench, and the width of the two main trenches located in the middle position is equal to or greater than the width of the two main trenches located on both sides.

6. The symmetrical tread structure according to claim 5, characterized in that, The bottom surface of the main groove is provided with multiple oblique pattern grooves, which are spaced apart circumferentially along the tire tread.

7. The symmetrical tread structure according to claim 6, characterized in that, The bottom surface of the main groove is provided with two sets of oblique patterned grooves at intervals along its width direction, and each set of oblique patterned grooves includes multiple oblique patterned grooves.

8. The symmetrical tread structure according to claim 1, characterized in that, The semi-enclosed grooves on the two shoulder tread ribs are arranged symmetrically and staggered. The semi-enclosed grooves include oblique coarse grooves and V-shaped fine grooves. One end of the V-shaped fine groove is connected to the end of the oblique coarse groove near the central tread rib, and the other end passes through the sidewall of the adjacent main groove.

9. The symmetrical tread structure according to claim 8, characterized in that, The V-shaped fine groove includes a first long side groove and a second long side groove. The first long side groove is inclined and has the same inclination direction as the inclined coarse groove. One end of the first long side groove is connected to the inclined coarse groove, and the other end is connected to one end of the second long side groove. The second long side groove extends along the axial direction of the tread, and the other end of the second long side groove penetrates the sidewall of the adjacent main groove.

10. A tire, characterized in that, The tire tread has a symmetrical tread structure as described in any one of claims 1 to 9.

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