A directional flow guiding device and a tire

Abstract

The present invention discloses a directional flow guiding device and a tire, belonging to the technical field of tires. The directional flow guiding device takes the tire tread pitch number as a cycle along the tire circumference, and successively opens from the tread combination area at the position where the crown contacts the ground along the tread towards the edge opening of the groove, and extends from the side wall of the groove to the bottom of the groove; the tread combination area is a combined structure of a slit and an inclined surface extending towards the edge, and the cut-off position of the side wall is in a closed state; the main body of the directional flow guiding device is inclined from the cut-off positions of the tread and the side wall towards the edge until the maximum opening is formed at the edge to form a wedge-shaped structure. The present invention is applied to tires, solves the technical problems that there are many limitations in optimizing the wet skid performance through tread design, has the characteristics of being able to realize the directional drainage function, accelerating the discharge of the accumulated water in the contact area between the road surface and the tread, effectively optimizing the critical adhesion ability of the tire on the road surface without sacrificing other performances of the tire, and improving the handling performance on wet road surfaces.

Description

Technical Field

[0001] The present invention belongs to the technical field of tires, and particularly relates to a directional diversion device and a tire. Background Art

[0002] A tire is an elastic component that directly contacts the road surface of a whole vehicle. The driving performance of the vehicle is restricted by the interaction between the tire and the road surface. When an automobile travels on a waterlogged road surface, when reaching a certain critical speed, the tire is not completely in contact with the road surface or completely separated from the ground, resulting in a sharp decline in the road surface adhesion ability, leading to longitudinal or lateral skidding out of control of the vehicle, seriously threatening driving safety. The decline in the road surface adhesion ability of the tire is mainly due to the generation of a dynamic water pressure difference when the tire collides with water when passing through a road surface with a certain water film thickness, and the formation of a water condensate by water and a solid medium plays a lubricating role in the critical contact area, resulting in the tire being lifted and generating a pure sliding phenomenon.

[0003] A large number of domestic and foreign researchers improve the drainage performance of tires by reasonably designing the trend of tread grooves and the ratio of groove blocks. However, the existing wet-slip optimized tread pattern design of tires still has many deficiencies: the balanced design of the comprehensive performance of the tire reduces the degree of freedom of the wet-slip performance design; the complexity of actual use conditions limits the best performance of the tire drainage performance; the draft design of the tread grooves will lose part of the drainage performance during the complete life cycle of the tire; it is almost impossible to make changes to the overall trend after the tire mold is processed, and the cost of secondary optimization of the drainage performance is high and the efficiency is low; the balance between the longitudinal and lateral adhesion abilities of the tire is particularly important.

[0004] It can be seen that when improving the tire drainage performance by reasonably designing the trend of tread grooves and the ratio of groove blocks, the following problems exist, that is, the contradiction between tire performances leads to the improvement of a certain performance at the expense of sacrificing other performances. Therefore, there are many limitations in optimizing the wet-slip performance through pattern design. Summary of the Invention

[0005] The details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable.

[0006] The present invention provides a directional diversion device and a tire, which solve the technical problem that when improving the tire drainage performance by reasonably designing the trend of tread grooves and the ratio of groove blocks, the contradiction between tire performances leads to the improvement of a certain performance at the expense of sacrificing other performances. Therefore, there are many limitations in optimizing the wet-slip performance through pattern design. It has the characteristics of being able to achieve a directional drainage function, accelerating the discharge of water accumulation in the contact area between the road surface and the tread surface, effectively optimizing the critical adhesion ability of the tire on the road surface without sacrificing other performances of the tire, and improving the handling performance on a wet road surface.

[0007] On the one hand, the present invention discloses a directional flow guiding device, characterized in that: the directional flow guiding device takes the tire tread pitch number as a period along the tire circumference, and successively opens from the tread combination area at the position where the crown contacts the ground along the tread towards the edge opening of the groove, and extends from the side wall of the groove towards the bottom of the groove;

[0008] The tread combination area is a combined structure of a slit and an inclined surface extending towards the edge, and the side wall cutoff is in a closed state;

[0009] The main body of the directional flow guiding device inclines from the cutoff position of the tread and the side wall towards the edge until the maximum opening is formed at the edge to form a wedge-shaped structure.

[0010] In some embodiments, the directional flow guiding device is arranged at the position of the longitudinal groove extending in the tire circumference and distributed along the tire width, and is arranged in a row along the extending direction of the longitudinal groove in the form of a wedge-shaped notch.

[0011] In some embodiments, the directional flow guiding device is arranged at the position of the transverse groove provided in the strip rib of the tire tread, and is arranged in a row along the extending direction of the transverse groove in the form of a wedge-shaped notch.

[0012] In some embodiments, the width of the slit in the tread combination area is not less than 0.2 mm, and the depth is 0.2 mm - 2 mm, and the starting point of the wedge-shaped notch of the directional flow guiding device is connected to the slit.

[0013] In some embodiments, the wedge-shaped notch of the directional flow guiding device has the maximum opening at the edge of the groove, the depth is not less than 0.5 mm, the width is 1 mm - 4 mm, and extends and closes from this position towards the tread and the side wall; the height of the directional flow guiding device at the side wall cutoff from the bottom plane of the groove is set to be ≥1 mm.

[0014] On the other hand, the present invention discloses a tire, and the above-mentioned directional flow guiding device as described in any one of the above is provided on the tread of the tire.

[0015] In some embodiments, ribs are provided on the tread of the tire; the ribs include a rib portion in direct contact with the ground and a rib side wall connected to the rib portion; the directional flow guiding device is distributed along the rib side wall.

[0016] In some of these embodiments, a number of transverse grooves are provided on the rib, at least one end point of the transverse groove is located on the side wall of the rib, and at least one of the directional flow guiding devices is provided on the side wall of the rib between two adjacent transverse grooves, and the effective distribution distance of the directional flow guiding device from the end point on the same-side side wall of the rib of the transverse groove ≥ 3 mm; the effective distribution distance between adjacent directional flow guiding devices on the same-side side wall of the rib is not less than 2 mm.

[0017] In some of these embodiments, the side wall of the rib includes a first rib side wall and a second rib side wall on the left and right sides, the transverse groove is semi-closed, and the right end point of the transverse groove is located on the second rib side wall;

[0018] The directional flow guiding device is also provided on the first rib side wall;

[0019] The directional flow guiding devices are evenly distributed at equal intervals along the whole circumference.

[0020] In some of these embodiments, ribs are provided on the tread of the tire, a number of transverse grooves are provided on the ribs, the directional flow guiding devices are distributed along the side walls of the transverse grooves, the effective distribution distance between the directional flow guiding devices and the end of the transverse groove ≥ 2 mm, and the distance between the directional flow guiding devices on the same-side side wall of the transverse groove is not less than 2 mm.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The present invention provides a directional flow guiding device, which realizes directional drainage without sacrificing other performances of the tire; and can be modified secondarily on the processed tire mold, effectively reducing the cost;

[0023] The present invention also provides a tire with a directional drainage function, which accelerates the discharge of the accumulated water in the contact area between the road surface and the tread, and effectively optimizes the critical adhesion ability of the tire on the road surface without sacrificing other performances of the tire, improving the handling performance on the wet road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is the tire distribution diagram of the directional flow guiding device provided by the embodiment of the present invention;

[0026] Figure 2 is the schematic diagram of the wedge-shaped structure of the directional flow guiding device provided by the embodiment of the present invention;

[0027] Figure 3 Stereogram a of the directional flow guiding device provided for the invention embodiment;

[0028] Figure 4 Stereogram b of the directional flow guiding device provided for the invention embodiment;

[0029] Figure 5 Stereogram c of the directional flow guiding device provided for the invention embodiment;

[0030] Figure 6 Partial view of the tire tread a of the present invention;

[0031] Figure 7 Partial view of the deformed 1 of the tire tread a of the present invention;

[0032] Figure 8 Partial view of the deformed 2 of the tire tread a of the present invention;

[0033] Figure 9 Partial view of the deformed 3 of the tire tread a of the present invention;

[0034] Figure 10 Partial view of the deformed 4 of the tire tread a of the present invention;

[0035] Figure 11 Partial view of the tire tread b of the present invention;

[0036] Figure 12 Partial view of the tire tread c of the present invention;

[0037] Figure 13 Partial view of the deformed 1 of the tire tread c of the present invention;

[0038] Figure 14 Partial view of the deformed 2 of the tire tread c of the present invention;

[0039] Figure 15 Partial view of the deformed 3 of the tire tread c of the present invention;

[0040] Figure 16 Schematic diagram a of the directional flow guiding device provided for the invention embodiment;

[0041] Figure 17 Schematic diagram b of the directional flow guiding device provided for the invention embodiment;

[0042] Figure 18 Schematic diagram c of the directional flow guiding device provided for the invention embodiment;

[0043] Description of the Drawings: 1. Directional flow guiding device; 2. Tread; 3. Sidewall; 4. Edge; 51. Longitudinal annular groove; 52. Transverse groove; 6. Slit; 7. Inclined surface extending towards the edge; 8. Apex of the wedge-shaped structure; 9. Inclined surface at the sidewall; 10. Cut-off position; 11. Groove; 12. Rib; 13. Rib portion; 14. Sidewall of the rib; 141. First sidewall of the rib; 142. Second sidewall of the rib; 15. Transverse siped; 16. Sidewall of the transverse groove. Detailed Description of the Invention

[0044] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described and explained below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0045] Obviously, the drawings in the following description are only some examples or embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, the present invention can also be applied to other similar scenarios based on these drawings. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present invention, some design, manufacturing or production changes based on the technical content disclosed in the present invention are only conventional technical means and should not be understood as insufficient disclosure of the content of the present invention.

[0046] When the term "embodiment" is mentioned in the present invention, it means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in the present invention can be combined with other embodiments without conflict.

[0047] Unless otherwise defined, the technical terms or scientific terms involved in the present invention shall have the ordinary meanings understood by those with ordinary skills in the technical field to which the present invention pertains. The similar words such as "a", "an", "one kind", "the" and the like involved in the present invention do not indicate a limitation in quantity and may represent a singular or plural number. The terms "comprising", "including", "having" and any variations thereof involved in the present invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products or devices. The similar words such as "connected", "coupled" and the like involved in the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in the present invention means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates an "or" relationship between the associated objects before and after. The terms "first", "second", "third" and the like involved in the present invention are only used to distinguish similar objects and do not represent a specific order for the objects.

[0048] An embodiment of the present invention provides a directional flow guiding device 1. Figure 1-8 The tire distribution diagram, structural schematic diagram, three-dimensional diagram and schematic diagram of the directional flow guiding device 1 according to the embodiment of the present invention. Refer to Figure 1-8 as shown

[0049] The directional air flow guide device 1 is arranged along the circumference of the tire with the number of tire pattern pitches as a cycle, and opens along the tread 2 to the edge 4 of the groove 11 in sequence from the tread 2 combination area where the crown contacts the ground, and extends to the bottom of the groove 11 through the sidewall 3 of the groove 11; the tread 2 combination area is a combination structure of a slit 6 and an inclined surface 7 extending toward the edge, and the end point of the sidewall 3 is in a closed state; the main body of the directional air flow guide device 1 is inclined toward the edge from the end point 10 of the tread 2 and sidewall 3 until it forms a wedge-shaped structure with the maximum opening at the edge 4. When the tire is traveling at a certain speed, the dynamic pressure generated by the water film in the area of incomplete contact between the tire and the ground reaches a certain thickness, and the instantaneous pressure difference between the pressure and the air pressure in the tire's circumferential main groove 11 creates a siphon force, squeezing the accumulated water into the slit 6 in the combined area of the tread 2. The water flows through the slit 6 along the wedge-shaped slope, and then flows through the opening to the sidewall 3 and into the circumferential groove, converting the water film from a squeezed state to a turbulent state and promptly discharging it through the circumferential groove. This increases the effective contact area in the area of complete contact between the tire and the ground, improves the tire's road adhesion, and ensures the tire's stability during normal straight-line driving or lateral control. Optionally, the directional flow guide device 1 is provided in the longitudinal groove position extending circumferentially and distributed along the tire width, and is arranged in the form of a wedge-shaped notch along the direction of expansion of the longitudinal groove. Furthermore, the directional guide device 1 is arranged at the position of the transverse groove 52 provided on the strip rib 13 of the tire pattern, and is arranged in the form of a wedge-shaped notch along the expansion direction of the transverse groove 52, further providing adhesion of the effective ground contact area, improving the steering control stability performance, and reducing the risk of vehicle loss of control due to skidding.

[0050] Specifically, such as Figure 1 The figure shows a partial cross-section of a tire, in which the directional guide device 1 is distributed at the edge 4 between the tread 2 and the sidewall 3 of the tire groove 11. In different wet road environments, according to the optimization direction of the tire's wet skid performance and the position of the tire pattern groove 11, the directional guide device 1 can be set at the longitudinal annular groove 51 to ensure that the accumulated water is accurately and directionally directed into the wide longitudinal groove 11 and drained in time. When the directional guide device 1 is set at the edge 4 of the transverse groove 52, the siphon force of the contact area further guides the fluid in the contact area into the transverse groove 52, hindering the lubrication between the tire tread and the ground and generating instantaneous pure sliding, thereby improving the tire's wet road adhesion. Figure 2 Shown Figure 1 The detailed structure of the directional flow guide device 1 is shown in the figure. As shown, the directional flow guide device 1 is configured with a slit 6 on the tread 2 and an inclined surface 7 extending toward the edge, which together form a tread combination area. The slit 6 extends through the edge 4 to the sidewall 3 and reaches the cutoff point 10 of the directional flow guide device 1. Fluid enters the slit 6 through the tread 2's ground contact area, or partially enters the edge 4 through the inclined surface 7 extending toward the edge. Under the influence of the dynamic pressure differential, the fluid flows toward the edge 4, changing from a tangential direction to a normal direction at the apex 8 of the wedge-shaped structure, then flows through the inclined surface 9 on the sidewall and the cutoff point 10 of the device, into the groove 11 for effective discharge. Figures 3-5 ShownFigure 1 The detailed structure of the directional flow guiding device 1 is shown as follows. The directional flow guiding device 1 is arranged such that the slit 6 at the tread 2 and the inclined surface 7 extending towards the edge jointly form a tread combination area, which extends from the edge 4 position to the sidewall 3 to the cut-off position 10 of the directional flow guiding device 1. The fluid converges into the slit 6 at the contact area between the tread 2 and the ground, or part of the fluid converges into the edge 4 of the inclined surface 7 extending towards the edge. Under the action of the dynamic pressure difference, the fluid flows towards the edge 4, changes from tangential to normal flow at the vertex 8 of the wedge-shaped structure, and converges into the groove 11 through the inclined surface 9 at the sidewall and the device cut-off position 10, and is effectively discharged.

[0051] As Figures 16-18 shown, the width w1 of the slit 6 in the tread 2 combination area is not less than 0.2 mm, the depth d1 is 0.2 mm - 2 mm, and the starting point of the wedge-shaped notch of the directional flow guiding device 1 is connected to the slit 6. The wedge-shaped notch of the directional flow guiding device 1 has the largest opening at the edge 4 of the groove 11, its depth d2 is not less than 0.5 mm, the width w2 is 1 mm - 4 mm, and extends and closes from this position towards the tread 2 and the sidewall 3. Optionally, the height of the directional flow guiding device 1 at the cut-off position of the sidewall 3 from the bottom plane of the groove 11 is set to ≥1 mm. Specifically, in the M-N direction, the parameters d1 are 0.2 mm - 2 mm, d2 are ≥0.5 mm, d3 ≥1 mm, L1 ≥1 mm, L2 = 4 / 3L1; in the E-F direction, the parameter w1 is ≥0.2 mm; w2 is 1 mm - 4 mm.

[0052] On the other hand, the present invention discloses a tire, and the tread 2 of the tire is provided with the directional flow guiding device 1 listed in any of the above embodiments. The tread 2 of the tire is provided with ribs 12; the ribs 12 include a rib portion 13 in direct contact with the ground, and a rib sidewall 14 connected to the rib portion 13; the directional flow guiding device 1 is distributed along the rib sidewall 14.

[0053] Optionally, a plurality of transverse grooves 15 are provided on the ribs 12, at least one end point of the transverse grooves 15 is located on the rib sidewall 14, and at least one directional flow guiding device 1 is provided on the rib sidewall 14 between two adjacent transverse grooves 15. The effective distribution distance of the directional flow guiding device 1 from the end point on the same-side rib sidewall 14 of the transverse groove 15 is ≥3 mm; the effective distribution distance between two adjacent directional flow guiding devices 1 on the same-side rib sidewall 14 is not less than 2 mm.

[0054] Specifically, as Figure 6As shown in the figure, the present invention relates to a tread surface a of a tire, which includes at least one tread rib 12 made of rubber material. The width of this tread rib 12 is R1 and the length is P, where R1 << P. The tread rib 12 includes a rib portion 13 in direct contact with the ground and a draft rib side wall 14 connected to the rib portion 13. A certain number of transverse grooves 15 are provided on the tread rib 12, and these transverse grooves 15 are distributed in a certain proportion to the number of tread pitches. The directional flow guiding device 1 of the present invention is arranged between any two adjacent transverse grooves 15, and it is stipulated that the effective distribution distance b of the directional flow guiding device 1 from the end of the transverse groove 15 is ≥ 3 mm, and the distance between the directional flow guiding devices 1 is not less than 2 mm. Its distribution quantity is determined according to the actual required wetland adhesion effect. The deformation embodiment of the first embodiment of the present invention is as Figures 7-10 shown.

[0055] Optionally, the rib side wall 14 includes a first rib side wall 141 and a second rib side wall 142 on the left and right sides. The transverse groove 15 is semi-closed, and the right end point of the transverse groove 15 is located on the second rib side wall 142; the directional flow guiding device 1 is also provided on the first rib side wall 141; the directional flow guiding devices 1 are evenly distributed along the entire circumference at equal intervals.

[0056] Specifically, as Figure 11 shown, the present invention relates to a tread surface b of a tire, which includes at least one tread rib 12 made of rubber material. The width of this tread rib 12 is R2 and the length is P, where R2 << P. The tread rib 12 includes a rib portion 13 in direct contact with the ground and a first rib side wall 141 and a second rib side wall 142 connected to the rib portion 13. A certain number of semi-closed transverse grooves 15 are provided on the tread rib 12, or there are no transverse grooves 15. The directional flow guiding device 1 of the present invention is arranged between any two adjacent semi-closed transverse grooves 15, and it is stipulated that the effective distribution distance b of the directional flow guiding device 1 distributed along the second rib side wall 142 from the end of the transverse groove 15 is ≥ 3 mm. It is stipulated that when the directional flow guiding device 1 of the present invention is arranged at the position of the first rib side wall 141, in addition to satisfying ≥ 2 mm for the effective distribution distance therebetween, it should be evenly distributed along the entire circumference at equal intervals.

[0057] Optionally, ribs 12 are provided on the tread surface 2 of the tire, a number of transverse grooves 15 are provided on the ribs 12, the directional flow guiding device 1 is distributed along the side wall of the transverse groove 15, and the effective distribution distance between the directional flow guiding device 1 and the end of the transverse groove 15 is ≥ 2 mm, and the distance between the directional flow guiding devices 1 on the same side wall of the transverse groove 15 is not less than 2 mm.

[0058] As Figure 12As shown, the present invention relates to a tread c of a tire, which includes at least one tread rib 12 made of a rubber material. A certain number of transverse grooves 15 are provided on the tread rib 12, and these transverse grooves 15 are distributed in a certain proportion to the number of tread pitches. The directional flow guiding device 1 of the present invention is arranged on any side wall 16 of the transverse groove, and it is stipulated that the effective distribution distance x of the directional flow guiding device 1 from the end of the transverse groove is x≥2mm, and the distance between the directional flow guiding devices 1 is not less than 2mm. The modified embodiment of the third embodiment of the present invention is as Figures 13-15 shown.

[0059] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0060] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A directional diversion device, characterized in that: The directional flow guiding device is periodic along the circumferential direction of the tire with the number of tread pitches of the tire pattern, and successively opens from the tread combination area at the position where the crown contacts the ground along the tread towards the edge opening of the groove, and extends from the side wall of the groove towards the bottom of the groove; The tread combination area is a combined structure of a slit and an inclined surface extending towards the edge, and the side wall cut-off position is in a closed state; The main body of the directional flow guiding device inclines from the cut-off position of the tread and the side wall towards the edge until the maximum opening is formed at the edge to form a wedge-shaped structure; The directional flow guiding device is arranged at the position of the longitudinal groove extending in the circumferential direction of the tire and distributed along the width of the tire, and is arranged in a row in the form of a wedge-shaped notch along the extending direction of the longitudinal groove; The directional flow guiding device is arranged at the position of the transverse groove provided on the strip-shaped rib of the tire pattern, and is arranged in a row in the form of a wedge-shaped notch along the extending direction of the transverse groove.

2. The directional flow guiding device according to claim 1, wherein: The width of the slit in the tread combination area is not less than 0.2 mm, and the depth is 0.2 mm - 2 mm. The starting point of the wedge-shaped notch of the directional flow guiding device is connected to the slit.

3. The directional flow guiding device according to claim 1, wherein: The wedge-shaped notch of the directional flow guiding device has the maximum opening at the edge of the groove, its depth is not less than 0.5 mm, and the width is 1 mm - 4 mm, and extends and closes from this position towards the tread and the side wall; the height of the directional flow guiding device at the cut-off position of the side wall from the bottom plane of the groove is set to ≥1 mm.

4. A tire, characterized in that: The tread of the tire is provided with the directional flow guiding device according to any one of claims 1 - 3.

5. The tire according to claim 4, characterized in that: The tread of the tire is provided with ribs; the ribs include a rib part in direct contact with the ground and a rib side wall connected to the rib part; the directional flow guiding device is distributed along the rib side wall.

6. The tire according to claim 5, wherein: A plurality of transverse knife grooves are provided on the ribs. At least one end point of the transverse knife groove is located on the rib side wall. At least one directional flow guiding device is provided on the rib side wall between two adjacent transverse knife grooves. The effective distribution distance of the directional flow guiding device from the end point on the same-side rib side wall of the transverse knife groove is ≥3 mm; the effective distribution distance between adjacent directional flow guiding devices on the same-side rib side wall is not less than 2 mm.

7. The tire according to claim 6, characterized in that: The rib side wall includes a first rib side wall and a second rib side wall on the left and right sides. The transverse knife groove is semi-closed, and the right end point of the transverse knife groove is located on the second rib side wall; The directional flow guiding device is also provided on the first rib side wall; The directional flow guiding devices are distributed at equal intervals along the whole circumference.

8. The tire according to claim 4, characterized in that: The tread of the tire is provided with ribs, and a plurality of transverse knife grooves are provided on the ribs. The directional flow guiding device is distributed along the side wall of the transverse knife groove. The effective distribution distance between the directional flow guiding device and the end of the transverse knife groove is ≥2 mm, and the distance between the directional flow guiding devices on the same-side side wall of the transverse knife groove is not less than 2 mm.

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