A block pattern block of a tire

Abstract

The present invention provides a block tread pattern of a tire. The surface of the tread pattern block is an uneven curved surface, and the outer edge of the tread pattern block is lower than the inner edge of the outer edge of the tread pattern block. It effectively alleviates the edge accumulation effect of the tread pattern block with the traditional structure and the uneven distribution state of the ground contact pressure / stress caused thereby, thereby improving the service life of the tire.

Description

Technical Field

[0001] The present invention relates to a tire, and more particularly to a block tread pattern of a tire. Background Art

[0002] As Figure 3 shown, in the structure of a common tread pattern block, the surface of the tread pattern block is formed by cutting on the crown surface of the tire, and the crown surface is formed by rotating one or more curves around the tire axis. Therefore, the surface of the common tread pattern block appears as a flat surface, and the edges are mostly sharp edges approximately at right angles.

[0003] In such a tread pattern block structure, under the condition of ground contact and compression, the tread pattern block is subjected to radial and lateral compression forces, and the tread pattern block is squeezed and deformed. Due to the incompressibility of the rubber material, the rubber of the tread pattern block will expand laterally. The rubber expands towards the edges of the tread pattern block, and the sharp edges at the edges of the tread pattern block cut into the ground, resulting in hindered expansion. This causes the rubber material to accumulate at the edges of the tread pattern block, forming ground contact pressure and stress concentration at the edges of the tread pattern block. At the same time, the accumulation of material at the edges of the tread pattern block indirectly leads to a decrease in the ground contact stress in the central region of the tread pattern block. In the non-ground contact central region, the tread pattern block is also subjected to lateral squeezing deformation. In these regions, under the influence of complex acting forces, the surface stress of the tread pattern block shows an extremely uneven state. By means of finite element simulation, we can intuitively see this uneven stress distribution state caused by the accumulation of rubber material at the edges of the tread pattern block and the influence of complex acting forces on the tread pattern block, resulting in uneven wear of the tread pattern block, specifically manifested as rapid wear and severe cutting at the edges of the tread pattern block, and abnormal wear of the tread pattern block, seriously affecting the overall life and appearance of the tire. See specifically Figure 4 and Figure 5 . Summary of the Invention

[0004] To solve the above problems, the present invention provides a block tread pattern of a tire, which effectively alleviates the edge accumulation effect of the tread pattern block with the traditional structure and the uneven distribution state of ground contact pressure / stress caused thereby, thereby improving the service life of the tire.

[0005] The purpose of the present invention is achieved in the following way: A block tread pattern of a tire, the surface of the tread pattern block is an uneven surface, and the peripheral edge of the tread pattern block is lower than the inner side of the peripheral edge of the tread pattern block.

[0006] At least one ring-shaped protrusion is provided on the block tread pattern of the tire, and the ring-shaped protrusion makes the peripheral edge of the tread pattern block lower than the inner side of the peripheral edge of the tread pattern block.

[0007] A ring-shaped protrusion is provided between the center point of the tread pattern block and the peripheral edge of the tread pattern block, and the center point of the tread pattern block is located inside the ring-shaped protrusion.

[0008] The inner and outer contour lines of the annular protrusion are respectively parallel to the outer contour of the whole tread block where the annular protrusion is located.

[0009] There is a ring of annular protrusions between the center point of the tread block and the peripheral edge of the tread block, and the center point of the tread block is located inside the annular protrusion.

[0010] There are at least two rings of annular protrusions between the center point of the tread block and the peripheral edge of the tread block, and the center point of the tread block is located inside these annular protrusions.

[0011] Along the normal direction of the tire tread surface, the position of the highest point of the annular protrusion is 0.5 - 3 mm higher than the center point of the tread block.

[0012] Along the normal direction of the tire tread surface, the position of the highest point of the annular protrusion is 0.5 - 3 mm higher than the peripheral edge of the tread block.

[0013] The annular protrusion is smoothly connected to the center point of the tread block and the peripheral edge of the tread block respectively through a smooth surface.

[0014] The annular protrusion is located in the area of 1 / 2 - 3 / 4 of the distance from the center point of the tread block to the edge of the tread block.

[0015] For the block - shaped tread block of the tire provided by the present invention, the surface of the tread block is an uneven curved surface, and the peripheral edge of the tread block is lower than the inner side of the periphery of the tread block. Thus, the inner side part of the periphery of the tread block touches the ground first, and the edge part has not touched the ground yet, so there is space for lateral expansion, which can effectively relieve the edge accumulation effect.

[0016] There is a ring of annular protrusions between the center point of the tread block and the peripheral edge of the tread block, and the center point of the tread block is located inside the annular protrusion. By referring to the bionics principle and the structure of animal feet / hands, such as human feet / hands, elephant feet, etc., the surface shows an internal depression and has a ring of annular protrusions outward. When this kind of structure touches the ground and is pressed, the annular protrusion touches the ground first. At this time, the peripheral edge of the tread block and the center point of the tread block have not touched the ground yet, leaving space for the lateral expansion of the rubber. The annular protrusion is compressed and laterally expands, which can not only fill the depressed area inside the annular protrusion but also fill the depressed area outside the annular protrusion, effectively relieving the edge accumulation effect of the tread block with the traditional structure and the uneven distribution state of the ground contact pressure / stress caused thereby, thus improving the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the block - shaped tread block of the present invention.

[0018] Figure 2 is Figure 1 a schematic diagram of the side - view contour line structure of the block - shaped tread block in

[0019] Figure 3It is a schematic structural diagram of a common tread block in the prior art.

[0020] Figure 4 It is a diagram of the stress distribution state on the grounding surface of a common tread block in the prior art.

[0021] Figure 5 It is a diagram of the abnormal wear state that occurs during the use of a common tread block in the prior art.

[0022] Figure 6 It is a diagram of the stress distribution state on the grounding surface of the block-shaped tread block of the present invention. Detailed implementation manners

[0023] The present invention will be specifically described below in conjunction with specific embodiments. It is necessary to point out here that these embodiments are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the content of the present invention above.

[0024] As Figure 1 and Figure 2 shown, a block-shaped tread block of a tire has a non-planar curved surface on its surface, and the outer edge 3 of the tread block is lower than the inner side of the outer edge of the tread block. The outer edge 3 of the tread block is lower than the inner side of the outer edge of the tread block, so that the inner part of the outer edge of the tread block touches the ground first, and the outer edge 3 of the tread block has not yet touched the ground, thus providing space for lateral expansion, which can effectively alleviate the edge accumulation effect of the tread block with the traditional structure and the uneven distribution state of the grounding pressure / stress caused thereby, thereby improving the service life of the tire.

[0025] At least one ring-shaped protrusion 2 is provided on the block-shaped tread block of the tire, and the ring-shaped protrusion 2 makes the outer edge 3 of the tread block lower than the inner side of the outer edge of the tread block.

[0026] The center point of the block-shaped tread block is simply referred to as the tread block center point 1. Here, the center point of the block-shaped tread block is the centroid of the planar graph of the block-shaped tread block as Figure 1 shown.

[0027] A ring-shaped protrusion 2 is provided between the tread block center point 1 and the outer edge 3 of the tread block, and the tread block center point 1 is located inside the ring-shaped protrusion 2. Thus, when the tread block touches the ground and is compressed, the ring-shaped protrusion 2 touches the ground first. At this time, the inside and outside of the ring-shaped protrusion 2 have not yet touched the ground, leaving space for the lateral expansion of the rubber. The ring-shaped protrusion 2 is compressed and undergoes lateral expansion, which can fill the concave area lower than the ring-shaped protrusion 2 inside the ring-shaped protrusion 2 and can also fill the area lower than the ring-shaped protrusion 2 outside the ring-shaped protrusion 2, which can effectively alleviate the edge accumulation effect of the tread block with the traditional structure and the uneven distribution state of the grounding pressure / stress caused thereby, thereby improving the service life of the tire.

[0028] The center point 1 of the tread block may not be located inside the annular protrusion 2.

[0029] There is an annular protrusion 2 between the center point 1 of the tread block and the peripheral edge 3 of the tread block. The center point 1 of the tread block is located inside the annular protrusion 2. By means of bionics principle, referring to the structure of animal feet / hands, such as human feet / hands, elephant feet, etc., the surface shows an internal depression and an annular protrusion on the outside. When this kind of structure is in contact with the ground and under pressure, the annular protrusion 2 touches the ground first. At this time, the peripheral edge 3 of the tread block, the center point 1 of the tread block and the areas adjacent to them have not touched the ground, leaving space for the lateral expansion of the rubber. The annular protrusion 2 is compressed and laterally expands, which can not only fill the sunken area inside the annular protrusion 2, but also fill the area outside the annular protrusion 2 that is lower than the annular protrusion 2, effectively alleviating the edge accumulation effect of the tread block of the traditional structure and the uneven distribution of the ground contact pressure / stress caused thereby, thus improving the service life of the tire.

[0030] The surface of the tread block in this application is designed to add an annular protrusion 2 on the basis of the existing ordinary tread design.

[0031] There may also be 2, 3, 4, 5 or more than 5 annular protrusions 2 between the center point 1 of the tread block and the peripheral edge 3 of the tread block, and the center point 1 of the tread block is located inside these annular protrusions 2.

[0032] The annular protrusion 2 can be a circular protrusion, an elliptical annular protrusion, a square annular protrusion, an annular protrusion with an irregular shape or an annular protrusion formed by two irregular curves.

[0033] Along the normal direction of the tire tread surface, the position of the highest point of the annular protrusion is 0.5 - 3 mm higher than the center point 1 of the tread block.

[0034] Along the normal direction of the tire tread surface, the position of the highest point of the annular protrusion is 0.5 - 3 mm higher than the peripheral edge 3 of the tread block, which is beneficial to the overall uniform wear of the tire tread.

[0035] The annular protrusion 2 is smoothly connected to the center point 1 of the tread block and the peripheral edge 3 of the tread block respectively through a smooth curved surface, enhancing the integrity of the tread surface and reducing the mold processing difficulty. The curved surface here includes a special curved surface - a plane.

[0036] The annular protrusion 2 is located within the region of 1 / 2 to 3 / 4 of the distance from the center point 1 of the tread block to the peripheral edge 3 of the tread block, which can fully reduce the stress distribution on the tread surface when the tire is in contact with the ground. For example, the annular protrusion 2 can completely occupy the region of 1 / 2 to 3 / 4 of the distance from the center point 7 of the tread block to the peripheral edge 3 of the tread block, or can completely occupy the region of 1 / 2 to 2 / 7 of the distance from the center point 7 of the tread block to the peripheral edge 3 of the tread block, or can completely occupy the region of 3 / 8 to 9 / 14 of the distance from the center point 7 of the tread block to the peripheral edge 3 of the tread block.

[0037] Experimental verification:

[0038] Under the same inflation pressure and the same load condition (800 kPa inflation pressure, 63000 kg load), the stress of the tread block structure provided by the present invention is compared with that of the ordinary tread block structure. Except for the different upper surface structures of the tread blocks, the other parts of the tread block of the present application and the ordinary tread block are the same.

[0039] As Figure 3 shown in the schematic diagram, the surface of the ordinary tread block is a flat curved surface.

[0040] As Figure 1 shown in the schematic diagram, the surface structure of the tread block of the present invention is: there is a ring of annular protrusions 2 between the center point 1 of the tread block and the peripheral edge 3 of the tread block. Here, the width of the annular protrusions 2 is the same, and the inner and outer contour lines of the annular protrusions 2 are parallel to the outer contour of the whole tread block where the annular protrusions are located - the peripheral edge 3 of the tread block respectively. An equal-width and equal-height surface 4 is provided at the center of the annular protrusions 2 in the width direction, and the equal-height surface 4 is also annular; the inner side of the equal-height surface 4 is smoothly connected to the inner contour line 7 of the annular protrusions 2 through an inner smooth transition surface 5 with the same width as the equal-height surface 4, and the inner side of the equal-height surface 4 is smoothly connected to the outer contour line 8 of the annular protrusions 2 through an outer smooth transition surface 6 with the same width as the equal-height surface 4. A tread block center region 9 is formed inside the annular protrusions 2, and the tread block center region 9 has the same height. Here, the outer contour line of the annular protrusions 2 coincides with the peripheral edge 3 of the tread block, that is, the annular protrusions 2 include an inner smooth transition surface 5, an equal-height surface 4, and an outer smooth transition surface 6.

[0041] The tread block center region 9 of the present application is the same as that in the ordinary tread block, that is, without modification. As Figure 2 shown in the schematic diagram, the width of the equal-height surface 4 is 25 mm, and the equal-height surface 4 is smoothly connected to the tread block center region 9 and the peripheral edge 3 of the tread block respectively through smooth surfaces with the same width as the equal-height surface 4 - an inner smooth transition surface 5 and an outer smooth transition surface 6. Along the normal direction of the tire tread surface, the height of the equal-height surface 4 is 1.5 mm higher than the height of the tread block center region 9, and along the normal direction of the tire tread surface, the height of the equal-height surface 4 is 2.0 mm higher than the height of the peripheral edge 3 of the tread block. The area of the tread block center region 9 is 11260 mm 2, the area of the inner smooth transition surface 5 is 12737 mm 2 , the area of the contour surface 4 is 17356 mm 2 , the area of the outer smooth transition surface 6 is 21601 mm 2 .

[0042] Through simulation technology, we can intuitively see the grounding surface stress distribution state diagram obtained by the tread block structure described in the present invention Figure 6 , compared with Figure 4 the grounding surface stress distribution state diagram of the ordinary tread block structure shown, Figure 4 and Figure 6 in which the shade of color represents the stress magnitude, the darker the color, the smaller the stress. Under the same characterization scale, it can be found that the surface stress distribution of the tread block structure of the present invention is more uniform, and the edge stress concentration effect is significantly improved.

[0043] Result: Under the same inflation pressure and the same load condition, compared with the ordinary tread block structure, the maximum grounding stress on the surface of the tread block structure described in the present invention is reduced by 50%. The tread block structure of the present invention can reduce the maximum grounding pressure of the tread block by 25% compared with the ordinary tread block design in the prior art, and can effectively alleviate the problems of abnormal wear of the tread block, cut and rapid wear of the tread block edge during the use of the tire, thereby improving the service life of the tire.

[0044] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. It should be noted that for those skilled in the art and any person familiar with the technical field, without departing from the overall concept of the present invention, equivalent substitutions or changes made according to the technical solution and inventive concept of the present invention, and several changes and improvements made, these should also be regarded as the protection scope of the present invention.

Claims

1. A block tread pattern block of a tire, characterized in that: The surface of the tread block is an uneven curved surface. A ring-shaped protrusion is added to the existing tread block. There is a ring-shaped protrusion between the center point of the tread block and the peripheral edge of the tread block. The ring-shaped protrusion is located in the area of 1 / 2 to 3 / 4 of the distance from the center point of the tread block to the edge of the tread block. The ring-shaped protrusion is smoothly connected to the center point of the tread block and the peripheral edge of the tread block respectively through a smooth curved surface; along the normal direction of the tire tread surface, and the ring-shaped protrusion makes the peripheral edge of the tread block lower than the inner side of the peripheral edge of the tread block. Along the normal direction of the tire tread surface, the highest point of the ring-shaped protrusion is 0.5 to 3 mm higher than the center point of the tread block. Along the normal direction of the tire tread surface, the highest point of the ring-shaped protrusion is 0.5 to 3 mm higher than the peripheral edge of the tread block.

2. The block tread block of the tire according to claim 1, characterized in that: The inner and outer contour lines of the ring-shaped protrusion are parallel to the outer contour of the whole tread block where the ring-shaped protrusion is located.

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