A central symmetric tread pattern structure for all-steel tires

Abstract

The present invention relates to the technical field of tire tread design, and discloses a center-symmetric tread structure for all-steel tires. The tire tread structure includes 5 tread blocks and 4 tread grooves arranged alternately, which are arranged horizontally along the tire tread. A number of independent shallow grooves or parallel and dense shallow grooves are provided on the tread blocks, and all the shallow grooves communicate with the tread grooves. Moreover, the width of the shallow grooves is only 1-2 mm and the depth is 1 mm. This design can prevent air from being blocked when the tread contacts the ground, reduce the number of closed tread grooves when the tread blocks contact the ground, thereby reducing resonance and noise. At the same time, the wave structure formed by the parallel and dense shallow grooves can increase drainage, effectively break the water film on wet or water-covered roads, enable the tire to have excellent grip when contacting the road surface, and ensure vehicle driving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of tire tread design, and specifically, to a center-symmetric tread structure for all-steel tires. Background Art

[0002] The tread pattern of a tire is also known as the tread. It is formed on the outer tire tread by molding or engraving. Its main functions are to improve the driving performance of the tire and enhance its aesthetics. The main types are: highway treads suitable for driving on paved roads, also known as ordinary treads; off-road treads suitable for driving on unpaved roads, also known as off-road tire treads, where the area of the tread blocks accounts for a relatively large proportion of the total area of the tire crown; a tread with a highway tread in the middle of the driving surface and off-road treads on both sides, called a mixed tread, also known as a general-purpose tread or all-purpose tread, where the contact area of the tread with the ground accounts for about sixty-five percent of the total area of the driving surface; treads with a requirement for the driving direction are called directional treads, whose patterns are in a chevron or oblique stripe shape, suitable for engineering machinery and agricultural tractor tires. They can provide good traction and self-cleaning properties. When installing a tire with this kind of tread, the apex of the chevron or oblique stripe must be aligned with the driving direction, and an arrow indicating the driving direction must be marked on the tire side. If used in the reverse direction, mud will fill the grooves and the traction performance will be lost; snow and mud treads, also known as winter tire treads, suitable for driving on muddy and snowy roads. This is a kind of block tread with sharp edges, which has good anti-slip performance and can ensure the safe driving of the tire on ice, snow, and muddy roads.

[0003] Tire treads need to be selected according to different requirements, but tire tread design is the most complex and difficult to handle. Many factors need to be considered. Bias towards grip easily generates relatively large noise, and bias towards drainage performance easily hinders the high-speed rotation of the tire. That is, when biased towards a certain specific ability, other performances will have significant deficiencies.

[0004] Chinese Invention Patent (Publication No.: CN219969314U; Publication Date: November 7, 2023) discloses a tread pattern structure for an all-steel load-bearing tubeless radial tire. The tire body includes a wheel disc and a tire tread. The tire tread is composed of nine equal parts of a flexible mold. Main tread grooves and main tread blocks are evenly distributed on the tire tread. The main tread grooves include two central tread grooves and two side tread grooves. The main tread blocks include one central tread block and two side tread blocks, forming a tread pattern structure. Rectangular secondary tread blocks are evenly distributed longitudinally at intervals on the central tread block and the side tread blocks. The long sides are along the longitudinal direction, and secondary block oblique grooves are provided inside. However, the distribution of the secondary tread blocks is relatively dense towards the center, and there are no tread grooves on the shoulder tread blocks, and it does not focus on tire drainage and noise reduction. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a center-symmetric tread structure for all-steel tires.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A center-symmetric pattern structure for all-steel tires. The pattern structure includes 5 pattern blocks and 4 pattern grooves arranged alternately, which are arranged horizontally along the tire tread. The 5 pattern blocks from left to right include a first pattern block, a second pattern block, a third pattern block, a fourth pattern block, and a fifth pattern block. The 4 pattern grooves from left to right include a first pattern groove, a second pattern groove, a third pattern groove, and a fourth pattern groove;

[0008] The first pattern block and the fifth pattern block are shoulder pattern blocks. A number of first contours are arranged at intervals in the circumferential direction of the first pattern block. The first contours extend from the first pattern groove into the first pattern block. The first contours and the first pattern groove enclose an inclined "7" shape; a first shallow groove is arranged around the outer circle of the first contours, and the head and tail ends of the first shallow groove are respectively connected to the first pattern groove;

[0009] The pattern on the fifth pattern block is centrosymmetric with the pattern on the first pattern block;

[0010] The second pattern block and the fourth pattern block are intermediate pattern blocks. A number of second contours are arranged at intervals in the circumferential direction of the second pattern block. The second contours extend from the second pattern groove to the first pattern groove. The second contours are opposite to the first contours in orientation. The second contours and the second pattern groove enclose a "7" shape. A second shallow groove is arranged around the outer circle of the second contours;

[0011] The second shallow groove includes a first end, a second end, a third end, a fourth end, a fifth end, and a sixth end connected in sequence. The first end is the starting end and is connected to the second pattern groove. The second end is connected to the first pattern groove. The third end, the fourth end, and the fifth end are located inside the second pattern block. The sixth end is the terminating end and is connected to the second pattern groove. A third shallow groove extends from the shallow groove connecting the third end and the fourth end to the first pattern groove, and the third shallow groove is connected to the first pattern groove; and a number of fourth shallow grooves parallel to the shallow groove connecting the second end and the third end are arranged inside the second contours;

[0012] The pattern on the fourth pattern block is centrosymmetric with the pattern on the second pattern block;

[0013] The third pattern block is a center pattern block. The third pattern block is provided with two circumferentially arranged annular fifth shallow grooves. The two fifth shallow grooves divide the third pattern block into three annular pattern strips, and a number of inclined sixth shallow grooves are arranged on the middle annular pattern strip. The sixth shallow grooves communicate with the two fifth shallow grooves;

[0014] The cross-section of the first shallow groove is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove is a semi-circle, and the radius of the semi-circle is 0.5 mm;

[0015] The cross-section of the second shallow groove is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove is a semi-circle with a radius of 0.5 mm.

[0016] The cross-section of the third shallow groove is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove is a semi-circle with a radius of 0.5 mm.

[0017] The fourth shallow groove has a groove depth of 1 mm and a groove width of 1 mm.

[0018] The cross-sections of the fifth and sixth shallow grooves are rounded rectangles, with a groove depth of 1 mm and a groove width of 2 mm, and a fillet radius of 0.5 mm.

[0019] Preferably, the groove patterns of the first and fourth tread grooves are left-right symmetric, and the bottoms of the grooves are all rounded at the corners; the first tread groove has a groove depth of 18 mm and a groove width of 13 mm, the left groove wall is inclined 18°50′ from the center, and the right groove wall is inclined 13°10′ from the center.

[0020] Preferably, the groove patterns of the second and third tread grooves are left-right symmetric, and the bottoms of the grooves are all rounded at the corners; the second tread groove has a groove depth of 18 mm and a groove width of 12 mm, the depth of the rounded corner is 3 mm, the left groove wall is inclined 19° from the center, and the right groove wall is inclined 13° from the center; preferably, the radius of the circle where the arc of the rounded corner is located is 5 mm.

[0021] Preferably, the minimum included angle between the sixth shallow groove and the fifth shallow groove is 30 - 60°.

[0022] Furthermore, the present invention also discloses a all-steel tire, and the tread pattern of the all-steel tire adopts the tire tread pattern structure described above.

[0023] The beneficial effects of the present invention are as follows: A number of independent shallow grooves or parallel and dense shallow grooves are provided on the tread blocks, all the shallow grooves are communicated with the tread grooves, and the width of the shallow grooves is only 1 - 2 mm and the depth is 1 mm. This design can avoid blocking air when the tread contacts the ground, reduce the number of closed tread grooves when the tread block contacts the ground, thereby reducing resonance and noise; at the same time, the wave structure formed by the parallel and dense shallow grooves can increase drainage, effectively break the water film on wet or water-covered roads, enable the tire to have excellent grip when contacting the road surface, and ensure the driving safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the tire tread pattern structure.

[0025] Figure 2 It is a schematic B-B cross-sectional view of the first, second, and third shallow grooves.

[0026] Figure 3Schematic diagram of the G-G cross-section of the fifth and sixth shallow grooves

[0027] Figure 4 Schematic diagram of the partial A-A cross-section of the second contour

[0028] Figure 5 Schematic diagram of the cross-section of the tread grooves. A: Schematic diagram of the D-D cross-section of the first tread groove, B: Schematic diagram of the C-C cross-section of the second tread groove, C: Schematic diagram of the E-E cross-section of the third tread groove, D: Schematic diagram of the F-F cross-section of the fourth tread groove

[0029] Figure 6 Schematic diagram of the tread pattern structure of the reference example tire Detailed implementation mode

[0030] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application

[0032] The following embodiments are described by combining Figures 1 - 5 Explanation

[0033] A center-symmetric tread pattern structure for all-steel tires, as Figure 1 shown. This tread pattern structure includes 5 alternately arranged tread blocks and 4 tread grooves, which are arranged horizontally along the tire tread. The 5 tread blocks from left to right include the first tread block 11, the second tread block 12, the third tread block 13, the fourth tread block 14, and the fifth tread block 15. The 4 tread grooves from left to right include the first tread groove 21, the second tread groove 22, the third tread groove 23, and the fourth tread groove 24

[0034] The first tread block 11 and the fifth tread block 15 are shoulder tread blocks. A number of first contours are arranged at intervals in the circumferential direction of the first tread block 11. The first contours extend from the first tread groove 21 into the first tread block 11. The first contours and the first tread groove 21 enclose an inclined "7" shape; a first shallow groove 31 is arranged in a circle around the outer circle of the first contour, and the head and tail ends of the first shallow groove 31 are respectively connected to the first tread groove 21. AsFigure 2 As shown, the cross-section of the first shallow groove 31 is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove 31 is a semi-circle with a radius of 0.5 mm. This shoulder pattern design can increase the shoulder grip while ensuring low noise.

[0035] The pattern on the fifth tread block 15 is centrosymmetric with the pattern on the first tread block 11.

[0036] The second tread block 12 and the fourth tread block 14 are intermediate tread blocks. A number of second contours are arranged at intervals in the circumferential direction of the second tread block 12. The second contours extend from the second tread groove 22 to the first tread groove 21. The orientation of the second contours is opposite to that of the first contours. The second contours and the second tread groove 22 enclose a "7" shape. The outer circle of the second contours is surrounded by a second shallow groove 32.

[0037] The second shallow groove 32 includes a first end, a second end, a third end, a fourth end, a fifth end, and a sixth end connected in sequence. The first end is the starting end and is connected to the second tread groove 22. The second end is connected to the first tread groove 21. The third end, the fourth end, and the fifth end are located inside the second tread block 12. The sixth end is the terminating end and is connected to the second tread groove 22. As Figure 2 shown, the cross-section of the second shallow groove 32 is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the second shallow groove 32 is a semi-circle with a radius of 0.5 mm.

[0038] A shallow groove connecting the third end and the fourth end extends towards the first tread groove 21 and is provided with a third shallow groove 33, and the third shallow groove 33 is connected to the first tread groove 21; and a number of fourth shallow grooves 34 parallel to the shallow groove connecting the second end and the third end are arranged inside the second contour. As Figure 2 shown, the cross-section of the third shallow groove 33 is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the third shallow groove 33 is a semi-circle with a radius of 0.5 mm; as Figure 4 shown, the fourth shallow groove 34 has a groove depth of 1 mm and a groove width of 1 mm. The interval between every two fourth shallow grooves 34 is 1 mm. The local cross-section inside the second contour is overall wavy, and each wave is a semi-circle with a radius of 0.5 mm. The pattern design inside the second contour can prevent the fine grooves of the pattern from blocking air when the tread contacts the ground, reduce the number of closed tread grooves when the tread block touches the ground, reduce resonance, and lower noise; at the same time, the wavy structure can effectively break the water film on a wet or water-covered road surface, enabling the tire to have excellent grip when contacting the road surface and ensuring vehicle driving safety.

[0039] The pattern on the fourth tread block 14 is centrosymmetric with the pattern on the second tread block 11.

[0040] The third tread block 13 is the central tread block. Two circumferentially arranged annular fifth shallow grooves 35 are provided on the third tread block 13. The two fifth shallow grooves 35 divide the third tread block 13 into three annular tread strips, and a number of inclined sixth shallow grooves 36 are provided on the middle annular tread strip. The sixth shallow grooves 36 communicate with the two fifth shallow grooves 35. As Figure 3 shown, the cross-sections of the fifth shallow grooves 35 and the sixth shallow grooves 36 are rounded rectangles, with a groove depth of 1 mm, a groove width of 2 mm, and a fillet radius of 0.5 mm. The transverse shallow grooves have a shallow depth, generate less vibration, discharge less air, reduce the influence of the transverse grooves on the tread noise, and can reduce the noise value generated by the tire.

[0041] The minimum included angle between the sixth shallow groove 36 and the fifth shallow groove 35 is 30 - 60°, which can make the transfer of the load on the tread surface smoother, reduce the vibration and impact when the tread block enters the contact area, and reduce the noise value.

[0042] As Figure 5 shown, the groove patterns of the first tread groove 21 and the fourth tread groove 24 are left-right symmetric, and the bottoms of the grooves are all rounded; as Figure 5 shown in (A), the first tread groove 21 has a groove depth of 18 mm, a groove width of 13 mm, the left groove wall is inclined 18°50′ from the center, and the right groove wall is inclined 13°10′ from the center; as Figure 5 shown in (D), the fourth tread groove 24 has a groove depth of 18 mm, a groove width of 13 mm, the left groove wall is inclined 13°10′ from the center, and the right groove wall is inclined 18°50′ from the center.

[0043] As Figure 5 shown, the groove patterns of the second tread groove 22 and the third tread groove 23 are left-right symmetric, and the bottoms of the grooves are all rounded; as Figure 5 shown in (B), the second tread groove 22 has a groove depth of 18 mm, a groove width of 12 mm, a rounded fillet depth of 3 mm, the left groove wall is inclined 19° from the center, and the right groove wall is inclined 13° from the center; as Figure 5 shown in (C), the third tread groove 23 has a groove depth of 18 mm, a groove width of 12 mm, a rounded fillet depth of 3 mm, the left groove wall is inclined 13° from the center, and the right groove wall is inclined 19° from the center. Preferably, the radius of the circle where the arc of the rounded fillet is located is 5 mm.

[0044] Simulation software: tread design analysis system.

[0045] <Noise performance>

[0046] Based on the analysis of the sound generation mechanism of tire tread noise, a physical test model of tire tread noise suitable for computer simulation analysis was established. The tire was subjected to noise simulation analysis at a speed of 80 km / h.

[0047] Test object: The tires described in the reference example and Example 1. The tires are of the same specification. The tire tread pattern used in the reference example is as Figure 6 shown.

[0048] The test results are shown in Table 1.

[0049] Table 1

[0050] Reference Example Example 1 Tire Tread Saturation Rate (%) 72.57 74.23 Noise (dB) 71 70

[0051] The above is the description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel points disclosed herein.

Claims

1. A center-symmetric tread pattern structure for all-steel tires. The tread pattern structure includes 5 tread blocks and 4 tread grooves arranged alternately, set horizontally along the tire tread. The 5 tread blocks from left to right include a first tread block (11), a second tread block (12), a third tread block (13), a fourth tread block (14), and a fifth tread block (15). The 4 tread grooves from left to right include a first tread groove (21), a second tread groove (22), a third tread groove (23), and a fourth tread groove (24). It is characterized in that The first tread block (11) and the fifth tread block (15) are shoulder tread blocks. A number of first contours are arranged at intervals in the circumferential direction of the first tread block (11). The first contours extend from the first tread groove (21) into the interior of the first tread block (11). The first contours and the first tread groove (21) enclose an inclined "7" shape. A first shallow groove (31) is arranged in a ring around the outer circle of the first contours. The head and tail ends of the first shallow groove (31) are respectively connected to the first tread groove (21). The tread pattern on the fifth tread block (15) is centrosymmetric with the tread pattern on the first tread block (11). The second tread block (12) and the fourth tread block (14) are intermediate tread blocks. A number of second contours are arranged at intervals in the circumferential direction of the second tread block (12). The second contours extend from the second tread groove (22) towards the first tread groove (21). The orientation of the second contours is opposite to that of the first contours. The second contours and the second tread groove (22) enclose a "7" shape. A second shallow groove (32) is arranged in a ring around the outer circle of the second contours. The second shallow groove (32) includes a first end, a second end, a third end, a fourth end, a fifth end, and a sixth end connected in sequence. The first end is the starting end and is connected to the second tread groove (22). The second end is connected to the first tread groove (21). The third end, the fourth end, and the fifth end are located inside the second tread block (12). The sixth end is the terminating end and is connected to the second tread groove (22). A third shallow groove (33) extends from the shallow groove connecting the third end and the fourth end towards the first tread groove (21) and is connected to the first tread groove (21). A number of fourth shallow grooves (34) parallel to the shallow groove connecting the second end and the third end are arranged inside the second contours. The tread pattern on the fourth tread block (14) is centrosymmetric with the tread pattern on the second tread block (11). The third tread block (13) is the center tread block. Two circumferentially arranged annular fifth shallow grooves (35) are arranged on the third tread block (13). The two fifth shallow grooves (35) divide the third tread block (13) into three annular tread strips. A number of inclined sixth shallow grooves (36) are arranged on the middle annular tread strip. The sixth shallow grooves (36) connect the two fifth shallow grooves (35). The cross-section of the first shallow groove (31) is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove (31) is a semi-circle with a radius of 0.5 mm. The cross-section of the second shallow groove (32) is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove (31) is a semi-circle with a radius of 0.5 mm. The cross-section of the third shallow groove (33) is an inverted arch shape, with a groove depth of 1 mm and a groove width of 1 mm. The lower half of the first shallow groove (31) is a semi-circle with a radius of 0.5 mm; The fourth shallow groove (34) has a groove depth of 1 mm and a groove width of 1 mm; The cross-sections of the fifth shallow groove (35) and the sixth shallow groove (36) are rounded rectangles, with a groove depth of 1 mm and a groove width of 2 mm, and a fillet radius of 0.5 mm.

2. The all-steel tire central symmetry tread pattern structure according to claim 1, characterized in that, The groove patterns of the first tread groove (21) and the fourth tread groove (24) are symmetric about the left and right, and the bottoms of the grooves are all rounded at the corners; the first tread groove (21) has a groove depth of 18 mm and a groove width of 13 mm, the left groove wall is inclined 18°50′ from the center, and the right groove wall is inclined 13°10′ from the center.

3. The all-steel tire center-symmetric tread pattern structure according to claim 1, characterized in that, The groove patterns of the second tread groove (22) and the third tread groove (23) are symmetric about the left and right, and the bottoms of the grooves are all rounded at the corners; the second tread groove (22) has a groove depth of 18 mm and a groove width of 12 mm, the depth of the rounded corner is 3 mm, the left groove wall is inclined 19° from the center, and the right groove wall is inclined 13° from the center.

4. The all-steel tire center-symmetric tread pattern structure according to claim 3, characterized in that, The radius of the circle where the arc of the rounded corner is located is 5 mm.

5. The all-steel tire center-symmetric tread pattern structure according to claim 1, characterized in that, The minimum angle between the sixth shallow groove (36) and the fifth shallow groove (35) is 30 - 60°.

6. A all-steel tire, characterized in that, The tread pattern of this all-steel tire adopts the all-steel tire center-symmetric pattern structure described in any one of claims 1 - 5.

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