Tire capable of reducing pitch noise and tire pattern design method thereof

Abstract

The invention discloses a tire capable of reducing pitch noise and a tire pattern design method thereof. A plurality of discrete points are established on the circumferential surface of a tire by using a pseudo-random point arithmetic unit; according to a Voronoi geometric principle, connecting each discrete point and the adjacent discrete points to form a triangle, extending the side length of each triangle as a perpendicular bisector, and intersecting the perpendicular bisectors to form a Voronoi Diagram; a Voronoi Diagram is reduced by a reduction ratio (between 0.99 and 0.7) with each discrete point as the center, a plurality of pattern blocks without concave angles are formed on the circumferential surface of the tire, and each pattern block divides a land part and a sea part on the circumferential surface of the tire to form a tire pattern. In this way, the pitch noise generated by the tire when the vehicle runs can be reduced.

Description

Technical Field

[0001] The present invention relates to a tire capable of reducing pitch noise and a tire pattern design method thereof, particularly to an invention in which pattern blocks without concave corners are formed on the circumferential surface of the tire according to the Voronoi geometry principle, and each pattern block forms a tire pattern. Background Art

[0002] When a vehicle is driving, the primary source of noise is the rolling contact of the tires with the road. Tire noise includes aerodynamic noise, air pump noise, cavity resonance, air column resonance, stick / slip noise, and the impact and vibration between the tread blocks and the road surface. The noise caused by the impact between the tread blocks and the road surface is also known as pitch noise.

[0003] Pitch noise is primarily caused by the geometry of the tire's tread pattern. These patterns and pitches are designed to provide good grip, drainage, and quietness. Therefore, the tread pattern and pitch are typically designed with irregular shapes and specific arrangements. This helps increase friction between the tire and the road, thereby increasing traction. They also aid in drainage on wet roads, improving driving safety. However, these irregular surface features combined with the pitch arrangement can produce pitch noise when in contact with or impacting the road.

[0004] For example, U.S. Patent No. US2014255A, “Tread for pneumatic tires,” uses irregularly shaped, single-pitch pattern blocks arranged in a repeating pitch pattern around the entire circumference. Figure 20 In this case, the geometric shape of the tire tread block A is limited to more than three sides and includes a convex corner A1 and a concave corner A2. However, the design of the tread block A with the concave corner A2 will cause stress concentration at the concave corner A2, resulting in abnormal noise. Summary of the Invention

[0005] Therefore, the purpose of the present invention is to provide a tire and a tire pattern design method thereof that can reduce pitch noise without affecting the tire's safety performance such as grip and drainage.

[0006] The present invention provides a tire pattern design method for reducing pitch noise, comprising: establishing a plurality of discrete points on a tire's circumferential surface using a pseudo-random point operator. Each discrete point is connected to adjacent discrete points to form a triangle, i.e., a Delaunay triangulation, according to Voronoi geometry principles. The sides of each triangle are extended as perpendicular medians, and the perpendicular medians intersect to form a Voronoi polygon. The Voronoi polygon is then scaled down with each discrete point as its center, forming a plurality of non-recessed tread blocks on the tire's circumferential surface. Each tread block divides the tire's circumferential surface into a land portion and a sea portion, thereby forming a tire pattern.

[0007] Furthermore, the number of the discrete points is between 240 and 1000.

[0008] Furthermore, the reduction ratio is between 0.99 and 0.7.

[0009] Furthermore, the discrete points are evenly distributed on the entire or partial circumferential surface of the tire.

[0010] Furthermore, the circumferential surface of the tire includes a tread portion and two adjacent shoulder portions, and the discrete points are evenly distributed on the tread portion.

[0011] Furthermore, the circumferential surface of the tire includes a tread portion and two adjacent shoulder portions, and the discrete points are evenly distributed on one of the shoulder portions.

[0012] Furthermore, the circumferential surface of the tire includes an inner portion and an outer portion in an axial direction of the tire's rolling direction, wherein the inner portion and the outer portion each occupy half of the width of the circumferential surface of the tire in the axial direction; the ratio of the number of discrete points in the inner portion to the outer portion is between 0:10 and 5:5. Furthermore, the ratio of the number of discrete points in the inner portion to the outer portion is 6:4.

[0013] Furthermore, the circumferential surface of the tire includes an inner portion, a central portion, and an outer portion in an axial direction of the tire's rolling direction, the inner portion and the outer portion each occupy one-fourth of the width of the circumferential surface of the tire in the axial direction, and the central portion occupies half of the width of the circumferential surface of the tire in the axial direction; the ratio of the number of the discrete points in the inner portion, the central portion, and the outer portion is 2:6:2.

[0014] The present invention further provides a tire capable of reducing pitch noise, which is manufactured using the tire tread design method for the tire capable of reducing pitch noise.

[0015] The above technical features can achieve the following effects:

[0016] 1. The present invention utilizes Voronoi geometry to form a tread pattern on the tire's circumferential surface, and the tread blocks do not have concave corners. A tread pattern spectrum shows that, compared to previous tires with concave corners, which can lead to noise energy being concentrated in specific locations and frequency ranges, the tire of the present invention eliminates this noise concentration, achieving superior noise energy dispersion.

[0017] 2. The greater the number of tread blocks, the better the spectral dispersion of pitch noise. The present invention designs the number of Voronoi tread blocks to be between 240 and 1000 to take into account tire performance such as tire grip and drainage.

[0018] 3. The Voronoi polygons form tread blocks at a reduced scale. The larger the reduction scale, the better the spectral dispersion of pitch noise. The present invention designs the Voronoi polygon reduction scale to be between 0.99 and 0.7, balancing tire performance, such as grip and drainage.

[0019] 4. The distribution of tread blocks can be varied according to the type of tire (passenger car, truck, bicycle, etc.). For example, different numbers of tread blocks can be arranged on the inner and outer sides of the tire, or different numbers of tread blocks can be arranged on the inner, center, and outer sides of the tire, or tread blocks can be arranged only on the tread or one of the shoulders of the tire. All of these can improve the spectral dispersion of pitch noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of arranging a plurality of discrete points within the circumferential surface of a tire using a pseudo-random point operator of computer graphics software in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of connecting discrete points on the circumferential surface of a tire into triangles in an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of a Voronoi diagram formed by connecting the perpendicular bisectors of the triangles on the circumferential surface of a tire in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of a tire pattern formed by reducing a Voronoi polygon on the circumferential surface of a tire according to a reduction ratio in an embodiment of the present invention.

[0024] Figure 5This is a three-dimensional appearance diagram of a tire with a first type of tire pattern according to an embodiment of the present invention, in which the tread blocks are evenly distributed over the entire circumference.

[0025] Figure 6 for Figure 5 Front view of.

[0026] Figure 7A This is a tread pattern diagram of a tire according to an embodiment of the present invention.

[0027] Figure 7B Spectrum diagram of the tread pattern of the tire according to the embodiment of the present invention.

[0028] Figure 8A This is the tread pattern of the tire according to the first variation of the present invention.

[0029] Figure 8B This is a spectrum diagram of the tread pattern of the tire according to the first variation of the present invention.

[0030] Figure 9A This is the tread pattern of the tire according to the second variation of the present invention.

[0031] Figure 9B This is a spectrum diagram of the tread pattern of the tire according to the second variation of the present invention.

[0032] Figure 10A The tread pattern diagram of an existing tire with concave corner blocks.

[0033] Figure 10B Spectrum diagram of the tread pattern of an existing tire with concave corner blocks.

[0034] Figure 11 This is a three-dimensional appearance diagram of a tire with a second type of tire pattern according to an embodiment of the present invention, in which the pattern blocks are evenly distributed on the tread portion.

[0035] Figure 12 for Figure 11 Front view of.

[0036] Figure 13 This is a three-dimensional appearance diagram of a tire with a third type of tire pattern according to an embodiment of the present invention, in which the tread blocks are evenly distributed on one of the tire shoulders.

[0037] Figure 14 for Figure 13 Front view of.

[0038] Figure 15 This is a schematic diagram of a tire pattern of the fourth type according to an embodiment of the present invention, in which different numbers of discrete points are designed on the inner and outer sides of the tire circumferential surface, thereby forming different numbers of pattern blocks on the inner and outer sides.

[0039] Figure 16This is a fifth type of tire pattern according to an embodiment of the present invention, in which different numbers of discrete points are designed on the inner, central, and outer portions of the tire's circumferential surface, thereby forming different numbers of pattern blocks on the inner, central, and outer portions.

[0040] Figure 17 FIG. 1 is a comparative histogram of the spectral dispersion of pitch noise of tires with different numbers of tread blocks according to an embodiment of the present invention.

[0041] Figure 18 FIG. 1 is a histogram comparing the spectral dispersion of the pitch noise of the tread blocks of the tire according to an embodiment of the present invention in different distribution modes.

[0042] Figure 19 FIG. 1 is a histogram comparing the spectral dispersion of the pitch noise of the tread blocks of the tire according to an embodiment of the present invention at different reduction ratios.

[0043] Figure 20 Schematic diagram of a tread block with concave corners on a conventional tire.

[0044] Explanation of reference numerals: 1-tire; 11-circumferential surface; 111-tread portion; 112-shoulder portion; 113-inner portion; 114-outer portion; 115-center portion; 12-pattern block; 2-discrete point; A-pattern block; A1-convex corner; A2-concave corner. DETAILED DESCRIPTION

[0045] The following embodiments are merely provided to assist in explaining the tire capable of reducing pitch noise and the tire pattern design method thereof of the present invention, and are not intended to limit the present invention.

[0046] See Figures 1 to 4 As shown, the tire pattern design method for reducing pitch noise in this embodiment includes the following steps:

[0047] A pseudo-random point operator is used to establish a plurality of discrete points 2 on the circumferential surface 11 of a tire 1. The number of discrete points 2 ranges from 240 to 1000. Each discrete point 2 is connected to adjacent discrete points 2 to form a triangle, i.e., a Delaunay triangulation, based on the principles of Voronoi geometry. The sides of each triangle are extended as perpendicular bisectors, and the perpendicular bisectors intersect to form a Voronoi polygon. The Voronoi polygon is then scaled down with each discrete point as its center, at a scale factor ranging from 0.99 to 0.7. This creates a plurality of tread blocks 12 without concave corners on the circumferential surface 11 of the tire 1. These tread blocks 12 define land and sea portions on the circumferential surface 11 of the tire 1, thereby forming the tire pattern of the tire 1.

[0048] See Figure 5 and Figure 6 As shown, this is the first type of tire pattern of this embodiment, the discrete points 2 (such as Figure 4 ) are evenly distributed on the entire circumferential surface 11 of the tire 1, and the pattern blocks 12 are formed on the entire circumferential surface 11 of the tire 1.

[0049] See Figure 7A The tread pattern of the first type tire 1 of this embodiment is: Figure 7B The tread pattern spectrum diagram of the first type tire 1 having this tread pattern is simulated by noise spectrum. The tread pattern spectrum diagram shows that there is no pitch noise concentrated in a specific frequency and position. Figure 8A and Figure 9A , is a variation of the tread pattern of the first type tire 1, Figure 8B and Figure 9B The figure shows a tread pattern spectrum diagram of a first type tire 1 with a modified tread pattern, obtained through noise spectrum simulation. In response to the tire 1's grip or drainage requirements, the spacing between some of the tread blocks 12 is slightly adjusted to increase or decrease the groove width. The tread pattern spectrum diagram also shows that there is no pitch noise concentrated at a specific frequency and position. Figure 10A As shown, the tire pattern block A has a concave angle A2 of the existing tire, Figure 10B The tread pattern spectrum diagram of a conventional tire in which the tread block A has a concave angle A2 is simulated by a noise spectrum. The tread pattern spectrum diagram shows that the pitch noise is concentrated at a specific frequency and position.

[0050] Referring to Table 1 below, the pitch noise spectrum dispersion of a conventional tire with concave corners in the tread blocks, and tire 1 having the aforementioned first type of tire pattern and the modified example is calculated.

[0051] Table 1

[0052]

[0053] according to Figure 7B , Figure 8B , Figure 9B , Figure 10B The tread pattern spectrum diagram and the pitch noise spectrum dispersion in Table 1 show that the tire 1 of the present invention does not have the phenomenon of pitch noise being concentrated at a specific frequency and a specific position and can achieve a better noise energy dispersion effect.

[0054] See Figure 11 and Figure 12 As shown, the second type of tire pattern of this embodiment, the circumferential surface 11 of the tire 1 includes a tread portion 111 and two adjacent shoulder portions 112. According to the requirements of tire performance, the discrete points 2 (such as Figure 4) are evenly distributed on the tread portion 111 , and evenly distributed pattern blocks 12 are formed on the tread portion 111 .

[0055] See Figure 13 and Figure 14 As shown, the third type of tire pattern of this embodiment is shown. According to the requirements of tire performance, the discrete points 2 (such as Figure 4 ) are evenly distributed on one of the tire shoulders, and evenly distributed pattern blocks 12 are formed on the tire shoulder portion 112.

[0056] See Figure 15 As shown, the fourth type of tire pattern of this embodiment, the circumferential surface 11 of the tire 1 includes an inner portion 113 and an outer portion 114 in an axial direction of the tire 1. The inner portion 113 and the outer portion 114 each occupy half of the width of the circumferential surface 11 of the tire 1 in the axial direction. According to the requirements of tire performance, the discrete points 2 (such as Figure 4 The ratio of the number of the discrete points 2 in the inner portion 113 to the outer portion 114 is between 0:10 and 5:5. For example, the ratio of the number of the discrete points 2 in the inner portion 113 to the outer portion 114 is 6:4. The discrete points 2 are uniformly distributed in the inner portion 113 and the outer portion 114 to form evenly distributed pattern blocks 12.

[0057] See Figure 16 As shown, the fifth type of tire pattern of this embodiment, the circumferential surface 11 of the tire 1 further includes a central portion 115 between the inner portion 113 and the outer portion 114 in the axial direction of the tire 1. The inner portion 113 and the outer portion 114 each occupy a quarter of the width of the circumferential surface 11 of the tire 1 in the axial direction, and the central portion 115 occupies half of the width of the circumferential surface 11 of the tire 1 in the axial direction. According to the requirements of tire performance, for example, the discrete points 2 (such as Figure 4 ) in the inner portion 113, the central portion 115 and the outer portion 114 in a ratio of 2:6:2.

[0058] The tires 1 with various tread patterns are mainly used to illustrate that the tread blocks 12 without concave corners established by the Voronoi geometry principle of the present invention can be set to different distributions according to the requirements of tire performance, but are not limited to the above-mentioned types.

[0059] See Figure 17As shown in Table 2 below, noise spectrum simulations were conducted using tires 1 with different numbers of blocks 12 evenly distributed across the entire circumferential surface 11. When the number of blocks 12 ranged from 240 to 1000, the spectrum dispersion was better than that of conventional tires with reentrant blocks. Furthermore, the greater the number of blocks 12, the better the spectrum dispersion. Users can select a different number of blocks 12 based on their tire performance requirements.

[0060] Table 2

[0061]

[0062] See Figure 18 As shown in Table 3 below, noise spectrum simulations were performed on tires 1 with the first, fourth, and fifth tread patterns of this embodiment. Compared to conventional tires with concave corner blocks, all tires have better spectral dispersion. Users can select different tread block 12 distributions based on tire performance requirements.

[0063] Table 3

[0064]

[0065] See Figure 19 As shown in Table 4 below, noise spectrum simulations were performed on the tread blocks 12 obtained by reducing the Voronoi polygon at different reduction ratios. When the reduction ratio was between 0.9 and 0.7, the spectral dispersion was better than that of conventional tires with concave-angle blocks. Furthermore, the greater the reduction ratio, the better the spectral dispersion of the obtained tread blocks 12. Users can select different reduction ratios based on tire performance requirements.

[0066] Table 4

[0067]

[0068] From the description of the above embodiments, one can fully understand the operation, use, and effects of the present invention. However, the above embodiments are merely preferred embodiments of the present invention and should not be used to limit the scope of the present invention. In other words, simple equivalent changes and modifications made in accordance with the claims and the description of the present invention are all within the scope of the present invention.

Claims

1. A tire pattern design method for reducing pitch noise, characterized in that: include: A plurality of discrete points are established on a circumferential surface of a tire using a pseudo-random point operator; According to the Voronoi geometry principle, each discrete point is connected with the adjacent discrete points to form a triangle, and the side lengths of each triangle are extended as perpendicular medians, and the perpendicular medians intersect to form a Voronoi polygon; The Voronoi polygon is reduced at a reduction ratio with each discrete point as the center, and a plurality of pattern blocks without concave corners are formed on the circumferential surface of the tire. Each pattern block divides the circumferential surface of the tire into a land portion and a sea portion to form a tire pattern.

2. The tire tread design method for reducing pitch noise according to claim 1, wherein: The number of the discrete points is between 240 and 1000.

3. The tire tread design method for reducing pitch noise according to claim 1, wherein: The reduction ratio is between 0.99 and 0.

7.

4. The tire tread design method for reducing pitch noise according to claim 1, wherein: The discrete points are evenly distributed on the entire or a portion of the circumferential surface of the tire.

5. The tire tread design method for reducing pitch noise according to claim 4, wherein: The circumferential surface of the tire includes a tread portion and two adjacent shoulder portions, and the discrete points are evenly distributed on the tread portion.

6. The tire tread design method for reducing pitch noise according to claim 4, wherein: The circumferential surface of the tire includes a tread portion and two adjacent shoulder portions, and the discrete points are evenly distributed on one of the shoulder portions.

7. The tire tread design method for reducing pitch noise according to claim 4, wherein: The circumferential surface of the tire includes an inner portion and an outer portion in an axial direction of the tire rolling, and the inner portion and the outer portion each occupy half of the width of the circumferential surface of the tire in the axial direction; the ratio of the number of the discrete points in the inner portion and the outer portion is between 0:10 and 5:

5.

8. The tire tread design method for reducing pitch noise according to claim 7, wherein: The ratio of the number of the discrete points in the inner portion to the number of the discrete points in the outer portion is 6:

4.

9. The tire tread design method for reducing pitch noise according to claim 4, wherein: The circumferential surface of the tire includes an inner portion, a central portion and an outer portion in an axial direction of the tire's rolling direction, the inner portion and the outer portion each occupy a quarter of the width of the circumferential surface of the tire in the axial direction, and the central portion occupies half of the width of the circumferential surface of the tire in the axial direction; the ratio of the number of the discrete points in the inner portion, the central portion and the outer portion is 2:6:

2.

10. A tire capable of reducing pitch noise, characterized in that: The tire is manufactured using the tire pattern design method for reducing pitch noise according to any one of claims 1 to 9.

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