Anti-eccentric-wear tire shoulder groove

Abstract

The invention relates to the technical field of tire pattern design, in particular to an anti-eccentric-wear tire shoulder groove which comprises a funnel-shaped shoulder groove and a plurality of inner convex blocks distributed in the funnel-shaped shoulder groove at equal intervals. According to the invention, through the arrangement of multi-stage wall surfaces of the funnel-shaped shoulder groove, the lateral supporting force of the groove wall is improved, and the inner convex blocks are arranged in the funnel-shaped shoulder groove at equal intervals, so that the lateral deformation of the shoulder groove is effectively resisted, and the stability of the shoulder groove is enhanced, thereby preventing the quick wear of two sides or one side of the shoulder groove; meanwhile, the central opening with the drop-shaped bottom is formed in the inner convex block, so that when the tire is extruded by large lateral force, the two sides of the opening in the middle section of the inner convex block firstly make contact and form support, and the situation that the tire body is damaged due to shearing force formed by excessive extrusion of the bottom of the shoulder groove is avoided; the inner convex block and the funnel-shaped shoulder groove which are designed in a structural mode jointly form a shoulder groove structure which is stable in supporting and capable of resisting lateral force extrusion, and the eccentric wear phenomenon of tires at the guide wheel positions of the lorry is improved.

Description

Technical Field

[0001] This invention relates to the field of tire tread design technology, and in particular to a tire shoulder groove designed to prevent uneven wear. Background Technology

[0002] Radial tires for heavy-duty trucks use radially arranged steel cords in their carcass, combined with multiple layers of steel cord bundles, forming a robust radial structure. This steel cord structure can withstand greater loads, provides more even contact with the ground, is less prone to deformation, offers good driving stability, low rolling resistance, reduces fuel consumption, and is wear-resistant, puncture-resistant, and has a long service life. They are mainly used on the guide wheels, drive wheels, and trailer wheels of medium and heavy-duty trucks. However, in actual use, radial tires for heavy-duty trucks often exhibit abnormal wear in the shoulder tread grooves, resulting in uneven wear and reduced tire life.

[0003] Chinese Patent Publication No. CN120840293A discloses an anti-uniform wear tread block and a tire containing it. By dividing the anti-uniform wear tread block into two quadrilaterals and two pentagons, and distributing the pentagons and quadrilaterals in an alternating pattern, the lateral strength of the tread is improved, thus mitigating the problem of uneven wear. It can be seen that in the prior art, tread pattern design is usually used to prevent uneven wear. However, the problem of abnormal wear in the shoulder area, resembling a riverbed, is usually caused by insufficient lateral force provided by the shoulder groove when the tire is turning, resulting in deviation, and insufficient stability of the shoulder groove, leading to rapid wear on both sides or one side of the groove. Therefore, simply strengthening the tire tread to deal with the problem of uneven wear is not very effective, especially for the guide wheel tires of heavy-duty trucks, where the problem of uneven wear is more serious. Summary of the Invention

[0004] Therefore, the present invention provides a tire shoulder groove to prevent uneven wear, in order to solve the problem of uneven wear easily occurring in the guide wheel position tires of heavy-duty vehicles in the prior art.

[0005] To achieve the above objectives, the present invention provides a tire shoulder groove for preventing uneven wear, comprising a funnel-shaped shoulder groove and a plurality of inner protrusions, wherein each inner protrusion is equidistantly distributed within the funnel-shaped shoulder groove; The inner protrusion has a central opening that runs circumferentially along the funnel-shaped shoulder groove. The bottom cross-section of the central opening is teardrop-shaped, and the lowest point of the bottom of the central opening is flush with the lowest point of the bottom of the funnel-shaped shoulder groove.

[0006] Furthermore, the cross-sectional shape of the funnel-shaped shoulder groove is funnel-shaped, and the bottom of the funnel-shaped shoulder groove is provided with a semi-circular arc-shaped bottom surface.

[0007] Furthermore, the funnel-shaped shoulder groove is symmetrically arranged on both sides. The groove wall on either side of the funnel-shaped shoulder groove includes a first wall surface, a second wall surface, and a third wall surface. The first wall surface is close to the tread side, the third wall surface is connected to the arc-shaped bottom surface, and the third wall surface is perpendicular to the plane where the tread is located. The second wall surface is located between the first wall surface and the third wall surface.

[0008] Furthermore, the first wall is an inclined or vertical wall, the second wall is an inclined wall, and the inclination slope of the first wall is higher than that of the second wall.

[0009] Furthermore, the depth H of the funnel-shaped shoulder groove is 6-26mm, the width L is 5-20mm, and the radius R3 of the arc-shaped bottom surface of the funnel-shaped shoulder groove is 1.5-5mm.

[0010] Furthermore, the highest point of the inner bump is flush with the edge of the funnel-shaped shoulder groove and the tread. Furthermore, the central opening is configured as a series of interconnected upper opening, middle opening, and lower opening from the tire surface towards the bottom of the funnel-shaped shoulder groove; The upper section has an inverted trapezoidal cross-section, the middle section has a rectangular cross-section, and the lower section has a teardrop shape.

[0011] Furthermore, the width at the widest point of the upper open section is equal to the width of the funnel-shaped shoulder groove, and the width at the narrowest point of the upper open section is equal to the rectangular width of the middle open section.

[0012] Furthermore, the radius of the arc at the bottom of the teardrop-shaped lower section opening cross-section is 1-3mm, the width of the rectangle in the middle section opening cross-section is 1-3mm, and the radius of the arc R1 of the chamfer connecting the upper part of the teardrop-shaped lower section opening cross-section and the rectangle in the middle section opening cross-section is 3-20mm.

[0013] Furthermore, the central opening divides the inner protrusion into two symmetrical blocks, which are trapezoidal or rectangular in the top view of the tread.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a funnel-shaped shoulder groove with a funnel-shaped cross-section and setting two-stage inclined groove walls within the funnel-shaped shoulder groove, the groove wall support strength of the funnel-shaped shoulder groove is improved. Simultaneously, by setting a third wall surface perpendicular to the plane of the tread and an arc-shaped bottom surface connected to the third wall surface within the funnel-shaped shoulder groove, the groove depth design requirements are met while ensuring the groove wall support strength, reducing the impact on tire drainage and heat dissipation during use. Furthermore, by equidistantly arranging inner protrusions within the funnel-shaped shoulder groove, the internal support strength of the funnel-shaped shoulder groove is further improved. When the tire turns, the inner protrusions can effectively resist the lateral deformation of the shoulder groove, enhancing the stability of the shoulder groove and thus preventing rapid wear on both sides or one side of the shoulder groove. Finally, by opening a central opening on the inner protrusion... In particular, the teardrop-shaped design of the lower opening not only helps with drainage and heat dissipation, but also guides water and mud to pass smoothly during tire operation, reducing abnormal wear caused by mud and sand accumulation. Furthermore, because the cross-sectional width of the middle opening is lower than that of the teardrop shape of the lower opening, when the tire is subjected to large lateral forces, the two sides of the middle opening of the inner protrusion contact first, forming support, and then slide friction occurs with the tire's movement, preventing the teardrop-shaped structure of the lower opening from being excessively compressed and generating shear force that could damage the tire carcass. Through the structural design of the inner protrusion, combined with the two-stage sloping groove wall design of the funnel-shaped shoulder groove, a shoulder groove structure with stable support and resistance to lateral force compression is formed, reducing the uneven wear phenomenon of guide wheel tires of heavy-duty trucks and improving tire life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the tire tread position for the anti-wear shoulder groove of the tire in this embodiment; Figure 2 This is a three-dimensional schematic diagram of the tread blocks of the tire shoulder groove for preventing uneven wear in this embodiment; Figure 3 This is a cross-sectional schematic diagram of the funnel-shaped shoulder groove in this embodiment; Figure 4 This is a cross-sectional schematic diagram of the inner protrusion in this embodiment; Figure 5 This is a top-view projection diagram of the inner protrusion in this embodiment.

[0016] Reference numerals: 1. Tread, 2. Funnel-shaped shoulder groove, 3. Inner protrusion, 201. First wall surface, 202. Second wall surface, 203. Third wall surface, 204. Arc-shaped bottom surface, 301. Block. Detailed Implementation

[0017] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0018] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0020] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0021] Please see Figure 1 and Figure 2 As shown, this embodiment provides a tire shoulder groove to prevent uneven wear. It is an annular groove on the tire tread 1 near the tire shoulder side. It includes a funnel-shaped shoulder groove 2 and a plurality of inner protrusions 3. The funnel-shaped shoulder groove 2 has a funnel-shaped cross section. Each inner protrusion 3 is equidistantly distributed in the funnel-shaped shoulder groove 2, and each inner protrusion 3 is integrally vulcanized with the tire body. That is to say, each inner protrusion 3 is also part of the tire body. The funnel-shaped shoulder groove 2 and the inner protrusions 3 distributed on its inner side constitute the tire shoulder groove to prevent uneven wear in this embodiment.

[0022] Please continue reading. Figure 3 As shown, the funnel-shaped shoulder groove 2 has a cross-section in the shape of a funnel, with a groove depth H of 6-26mm and a groove width L of 5-20mm. The bottom of the funnel-shaped shoulder groove 2 is provided with a semi-circular arc-shaped bottom surface 204, and the radius R3 of the arc-shaped bottom surface 204 is 1.5-3mm. The funnel-shaped shoulder groove 2 is symmetrically arranged on both sides. The groove wall on either side of the funnel-shaped shoulder groove 2 includes a first wall surface 201, a second wall surface 202 and a third wall surface 203. The first wall surface 201 is close to the tread 1. The third wall surface 203 is connected to the arc-shaped bottom surface 204 and is perpendicular to the plane where the tread 1 is located. The second wall surface 202 is located between the first wall surface 201 and the third wall surface 203. Specifically, the angle α between the first wall surface 201 and the plane containing the tread 1 satisfies the condition that the angle α ≥ 90°, and the angle b between the second wall surface 202 and the third wall surface 203 satisfies the condition that 135° ≤ angle b ≤ (270° - angle α), making the second wall surface 202 an inclined wall surface, and the inclination slope of the first wall surface 201 is higher than the inclination slope of the second wall surface 202, forming the wall of the inclined funnel-shaped shoulder groove 2; By setting the first wall 201, the tire rubber at the edge of the funnel-shaped shoulder groove 2 can form a right-angle or obtuse-angle structure, improving the stability at the edge of the funnel-shaped shoulder groove 2. A second wall 202 with a lower inclination is set below the first wall 201, so that there is more tire rubber at the second wall 202, which can provide stronger support for the outer tread 1 at the edge of the funnel-shaped shoulder groove 2. Furthermore, a third wall 203 perpendicular to the plane of the tread 1 and an arc-shaped bottom surface 204 connected to the third wall 203 are set, so that the overall depth of the funnel-shaped shoulder groove 2 meets the design requirements and does not affect the drainage and heat dissipation of the tire during use.

[0023] Please continue reading. Figure 4 As shown, the inner protrusion 3 is provided in the funnel-shaped shoulder groove 2, and its highest point is flush with the edge of the funnel-shaped shoulder groove 2 and the tread 1. Specifically, the inner protrusion 3 has a central opening circumferentially along the funnel-shaped shoulder groove 2. The central opening includes an upper opening, a middle opening and a lower opening that are sequentially arranged and connected from the tread 1 toward the bottom of the funnel-shaped shoulder groove 2. The upper section opening has an inverted trapezoidal cross section. The widest part of the upper section opening is equal to the width L of the funnel-shaped shoulder groove 2. The narrowest part of the upper section opening has a width S, which is 1-3mm. The angle d between the inclined surface of the upper section opening and the plane where the tread 1 is located is consistent with the condition that the angle a < the angle d < 180°. The depth M of the upper section opening is 3-17mm. The middle section opening has a rectangular cross-section, and the width of the rectangle is equal to the width S of the narrowest part of the upper section opening; The lower section has a teardrop-shaped opening section with a radius of 1-3 mm for the bottom arc R2. The upper part of the teardrop and the middle section of the rectangular opening section have a radius of 3-20 mm for the chamfered arc R1.

[0024] By equidistantly arranging inner protrusions 3 within the funnel-shaped shoulder groove 2, the internal support force of the funnel-shaped shoulder groove 2 is further improved. When the tire turns, the inner protrusions 3 can effectively resist the lateral deformation of the shoulder groove, enhancing its stability and preventing rapid wear on both sides or one side of the shoulder groove. Simultaneously, the central opening along the circumference of the funnel-shaped shoulder groove 2 on the inner protrusions 3, especially the teardrop-shaped design of the lower opening, not only aids in drainage and heat dissipation but also guides water and mud smoothly through during tire operation, reducing abnormal wear caused by mud accumulation. Furthermore, due to the central opening... The cross-sectional width of the inner protrusion 3 is lower than that of the lower opening teardrop-shaped cross-sectional width. When the tire is subjected to a large lateral force, the two sides of the opening in the middle of the inner protrusion 3 first come into contact to form support, and slide friction occurs with the movement of the tire, which avoids the lower opening teardrop-shaped structure being excessively squeezed to form shear force and damage the tire body. Through the structural design of the inner protrusion 3, combined with the two-stage inclined groove wall design of the funnel-shaped shoulder groove 2, a shoulder groove structure with stable support and resistance to lateral force compression is formed, which reduces the uneven wear phenomenon of the guide wheel position tire of heavy truck and extends the service life of the tire as a whole.

[0025] In addition, the lowest point of the bottom of the central opening is level with the lowest point of the bottom of the funnel-shaped shoulder groove 2, so that the central opening divides the inner protrusion 3 into two symmetrical blocks 301.

[0026] Please continue reading. Figure 5As shown, on the top view projection surface of the tread 1, the inner protrusion 3 is divided into two symmetrical blocks 301, both of which are trapezoidal. The side of the projection surface of block 301 closest to the edge of the funnel-shaped shoulder groove 2 is the lower base, with a length G of 5-40 mm. The side of the projection surface of block 301 closest to the central opening is the upper base, with a length F of 5-30 mm. The angle c between the waist of the trapezoidal projection surface of block 301 and the edge of the funnel-shaped shoulder groove 2 conforms to… For the inner protrusion 3, the included angle c ≤ 150°, and anti-slip stripes are provided on the top surface of the block 301. The specific size selection and included angle design should be set according to the actual tire size. The two sides of the inner protrusion 3 are set as trapezoidal structures with projected surfaces. On the one hand, this ensures that the connection area between the block 301 and the sidewall of the funnel-shaped shoulder groove 2 is sufficient, improving the lateral support of the block 301. On the other hand, when the two sides of the block 301 are pressed against each other, the compressive force is better distributed to the funnel-shaped shoulder groove. On the sidewall of groove 2; on the other hand, it can ensure drainage at the inner protrusion 3 and reduce the impact of the inner protrusion 3 on the overall drainage of the funnel-shaped shoulder groove 2; in this embodiment, the included angle c ≥ 90°, indicating that the shape of the block 301 on the top projection plane can be trapezoidal or rectangular. When the overall size of the tire is small, the width and depth of its shoulder groove are also relatively small. Therefore, the minimum size of the lower base length and the upper base length of the block 301 can be selected, i.e., 5mm. At this time, the shape of the block 301 on the top projection plane is rectangular, and the included angle between its waistline and the edge of the funnel-shaped shoulder groove 2 is 90°; since the blocks 301 on both sides of the inner protrusion 3 need to contact and support during the use of the tire, if the upper base length of the block 301 on the top projection plane is too small, i.e., the contact area of ​​the two blocks 301 is too small, it cannot play a supporting role. Therefore, in the extreme case where the overall size of the tire is too small, the shape of the block 301 on the top projection plane can be designed as rectangular.

[0027] In this embodiment, a specific example of the dimensions of the anti-uniform wear tire tread shoulder groove structure is provided. The tire specification of the example tire is 295 / 80R22.5, wherein the groove depth H of its funnel-shaped shoulder groove 2 is 16.5mm, the groove width L is 15mm, and the radius R3 of the arc-shaped bottom surface 204 is 2. mm, the angle α between the first wall surface 201 and the plane where the tread 1 is located is 95°, the angle b between the second wall surface 202 and the third wall surface 203 is 152°; the width S of the narrowest part of the upper opening of the inner protrusion 3 is 1.5mm, the angle d between the inclined surface of the upper opening and the plane where the tread 1 is located is 134°, the depth M of the upper opening is 7mm, the width of the middle opening is equal to the width S of the narrowest part of the upper opening, which is 1.5mm, the radius R2 of the arc of the teardrop-shaped bottom of the lower opening is 1.5mm, and the radius R1 of the arc of the chamfer of the upper part of the teardrop and the rectangular section of the middle opening is 10mm; on the top projection surface of the tread 1, the lower base length G of the projection surface of the blocks 301 on both sides of the inner protrusion 3 is 22mm, the upper base length F is 14mm, and the angle c between the waist of the projection surface of the block 301 and the edge of the funnel-shaped shoulder groove 2 is 121°.

[0028] In this embodiment, a road test is conducted using the example tire as the test object to address the tire's shoulder grooves designed to prevent uneven wear. AR612 Road Test Plan: This road test is a target road test for anti-wear performance. Four vehicles of the same model with different routes were selected in Zhongshan, Guangdong for installation. The routes were mainly highways, with a one-way distance of 400-500 kilometers and a monthly mileage of about 15,000 kilometers. The test vehicles are shown in Table 1.

[0029] Table 1: Information Table for Anti-Wear Road Test Vehicles The road test data for this embodiment is shown in Table 2;

[0030] Table 2: Data Table for Anti-Uneven Wear Road Test of Each Vehicle In Table 2 of this embodiment, the initial groove depth of the case tires, from left to right, is the left shoulder groove depth, the center groove depth, and the right shoulder groove depth. As can be seen from Table 2, the groove depth of the four vehicles that underwent anti-uniform wear road test was uniform after driving, and the wear degree of the left shoulder groove, the center groove, and the right shoulder groove was basically the same. There was no shoulder wear phenomenon in the left shoulder groove and the right shoulder groove.

[0031] In summary, the anti-uneven wear tire shoulder groove provided in this embodiment, when applied to the guide wheel position tires of heavy-duty trucks, can provide good lateral support, reduce abnormal wear on the tire shoulder, and effectively improve the uneven wear situation of the guide wheel position tires of heavy-duty trucks.

[0032] Meanwhile, through reasonable size design and optimized opening shape, this structure significantly improves tire lifespan while ensuring tire drainage and heat dissipation. Actual road tests have shown that tires using the shoulder groove structure of this embodiment exhibit uniform wear in the shoulder groove area after prolonged high-speed driving, without any unilateral wear, proving its effective resistance to tire deformation caused by lateral forces. Through parametric design methods, the shoulder groove structure can also flexibly adjust the groove wall angle, inner protrusion size, and opening shape according to the load requirements and usage scenarios of different tire specifications, thus having wide applicability.

[0033] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tire shoulder groove for preventing uneven wear, characterized in that, It includes a funnel-shaped shoulder groove and a plurality of inner protrusions, wherein each of the inner protrusions is equidistantly distributed within the funnel-shaped shoulder groove; The inner protrusion has a central opening that runs circumferentially along the funnel-shaped shoulder groove. The bottom cross-section of the central opening is teardrop-shaped, and the lowest point of the bottom of the central opening is flush with the lowest point of the bottom of the funnel-shaped shoulder groove.

2. The tire shoulder groove for preventing uneven wear according to claim 1, characterized in that, The cross-sectional shape of the funnel-shaped shoulder groove is funnel-shaped, and the bottom of the funnel-shaped shoulder groove is provided with a semi-circular arc-shaped bottom surface.

3. The anti-uniform wear tire shoulder groove according to claim 2, characterized in that, The funnel-shaped shoulder groove is symmetrically arranged on both sides. The groove wall on either side of the funnel-shaped shoulder groove includes a first wall surface, a second wall surface, and a third wall surface. The first wall surface is close to the tread side. The third wall surface is connected to the arc-shaped bottom surface and is perpendicular to the plane where the tread is located. The second wall surface is disposed between the first wall surface and the third wall surface.

4. The tire shoulder groove for preventing uneven wear according to claim 3, characterized in that, The first wall is an inclined or vertical wall, the second wall is an inclined wall, and the inclination slope of the first wall is higher than that of the second wall.

5. The anti-uniform wear tire shoulder groove according to claim 2, characterized in that, The depth H of the funnel-shaped shoulder groove is 6-26mm, the width L is 5-20mm, and the radius R3 of the arc-shaped bottom surface at the bottom of the funnel-shaped shoulder groove is 1.5-5mm.

6. The anti-uniform wear tire shoulder groove according to claim 1, characterized in that, The highest point of the inner protrusion is flush with the edge of the funnel-shaped shoulder groove and the tread.

7. The anti-uniform wear tire shoulder groove according to claim 1, characterized in that, The central opening is configured as a series of connected upper, middle and lower openings from the tire surface towards the bottom of the funnel-shaped shoulder groove. The upper section opening has an inverted trapezoidal cross-section, the middle section opening has a rectangular cross-section, and the lower section opening has a teardrop shape.

8. The anti-uniform wear tire shoulder groove according to claim 7, characterized in that, The widest part of the upper section opening cross-section is equal to the width of the funnel-shaped shoulder groove, and the narrowest part of the upper section opening cross-section is 1-3mm.

9. The anti-uniform wear tire shoulder groove according to claim 8, characterized in that, The radius of the arc at the bottom of the teardrop-shaped lower section opening cross-section is 1-3mm, and the radius of the arc R1 of the chamfer connecting the upper part of the teardrop-shaped lower section opening cross-section and the rectangular middle section opening cross-section is 3-20mm.

10. The tire shoulder groove for preventing uneven wear according to claim 1, characterized in that, The central opening divides the inner protrusion into two symmetrical blocks, which are trapezoidal or rectangular in the top view of the tread.

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