阅读说明：本技术 低噪声轮胎中主沟槽降噪结构 (Main groove noise reduction structure in low-noise tire ) 是由 张永斌 王哲 李宁学 张小正 毕传兴 于 2020-08-12 设计创作，主要内容包括：本发明公开了一种低噪声轮胎中主沟槽降噪结构,其特征是在主沟槽的底面具有规则排列的锥状凸起,以锥状凸起在主沟槽中垂直于沟槽流道的断面上形成各凸齿；其规则排列是指：锥状凸起在主沟槽的底面沿轮胎周向成单列设置,或为平行且间隔设置的多列。本发明中设置于主沟槽底面的锥状凸起能有效改善主沟槽内近壁面的湍流结构,减少涡流之间相互碰撞和异常分离导致的破裂,降低湍流的强度和脉动压力,从而有效降低轮胎的气动噪声。(The invention discloses a noise reduction structure of a main groove in a low-noise tire, which is characterized in that the bottom surface of the main groove is provided with regularly arranged conical bulges, and the conical bulges form convex teeth on the section, perpendicular to a groove flow passage, in the main groove; the regular arrangement thereof means that: the conical protrusions are arranged in a single row or multiple rows arranged in parallel and at intervals on the bottom surface of the main groove along the circumferential direction of the tire. The conical bulge arranged on the bottom surface of the main groove can effectively improve a turbulent flow structure close to the wall surface in the main groove, reduces breakage caused by mutual collision and abnormal separation between vortexes, and reduces the intensity and pulsating pressure of turbulent flow, thereby effectively reducing the pneumatic noise of the tire.)

1. A main slot noise reduction structure in a low-noise tire is characterized in that: the bottom surface of the main groove is provided with regularly arranged conical bulges, and the conical bulges are used for forming convex teeth on the section, perpendicular to the groove flow channel, in the main groove; the regular arrangement is that: the conical protrusions are arranged on the bottom surface of the main groove in a row along the circumferential direction of the tire; the rows are arranged into a single row or a plurality of rows which are arranged in parallel and at intervals.

2. The noise reducing structure of main grooves in low noise tires according to claim 1, characterized in that: on any section vertical to the groove flow channel, the convex teeth are the same in shape and size; and the sum of the cross-sectional areas of all the convex teeth is 2-5% of the flow passage surface of the main groove.

3. The noise reducing structure of main grooves in low noise tires according to claim 1, characterized in that: in the direction along the channel of the groove, the included angle between the surface of the conical bulge and the side wall of the groove is 0-30 degrees.

4. The noise reducing structure of main grooves in low noise tires according to claim 1, characterized in that: the center distance between two adjacent rows of convex teeth is 1-1.5 times of the width of the bottom edge of the convex teeth.

5. The noise reducing structure of main grooves in low noise tires according to claim 1, characterized in that: the conical protrusions are regular rectangular pyramids which are identical in shape and size, the combination interface of the regular rectangular pyramids and the bottom surface of the main groove is rhombic, the first diagonal line of two mutually perpendicular diagonal lines of the rhombus is along the flow passage direction of the main groove, and the second diagonal line is perpendicular to the flow passage direction of the main groove; the first diagonals of adjacent right pyramids in the same column are end-to-end or spaced.

6. The structure of reducing noise in a main groove of a low noise tire according to claim 5, wherein: setting the relevant dimensions of the regular rectangular pyramid as:

L₁₁＝(1.5～2)L₁₂；L₁₂＝(0.1～0.2)W；H₁＝(0.125～0.25)H；

L₁₁is the length of the first diagonal, L₁₂Is the second diagonal length;

w is the width of the main groove, and H is the depth of the main groove; h₁Is the height of the regular rectangular pyramid.

7. The noise reducing structure of main grooves in low noise tires according to claim 1, characterized in that: the conical protrusions are arranged in an array in the circumferential direction of the tire in a long strip shape, the combination interface of the long strip and the bottom surface of the main groove is rectangular, the cross section of the long strip is in the shape of an isosceles triangle, and the bottom side of the isosceles triangle is perpendicular to the direction of the flow channel of the main groove.

8. The main groove noise reducing structure in a low noise tire according to claim 7, wherein: setting the relevant dimensions for the strip as:

W₂＝(0.1-0.2)W；H₂＝(0.125～0.25)H；

W₂is the base width of an isosceles triangle H₂Is the height of an isosceles triangle;

w is the width of the main groove, and H is the depth of the main groove.

9. The noise reducing structure of main grooves in low noise tires according to claim 1, characterized in that: the conical protrusions and the tire are of an integral structure made of the same materials.

Technical Field

The invention relates to a low-noise tire, in particular to a tire noise reduction method by arranging a pattern structure on the bottom surface of a main groove of the tire, which reduces the aerodynamic noise of the tire during running.

Background

The noise generated by the interaction of the tire with the road surface is an important component of traffic noise, and tire/road noise has become a major source of traffic noise even at normal driving speeds with greatly reduced noise from the engine and other mechanical components. The tire noise generation mechanism is classified into two main categories, mainly, according to the nature of the noise generation: one is the vibrational noise of the tire structure due to changes in contact force, and the second is the aerodynamic noise due to unsteady flow of air caused by rotation and movement of the tire. In the middle and high speed driving condition, the influence of aerodynamic noise in tire/road noise is more obvious, noise reduction is realized by changing the tire surface pattern and adding a noise elimination structure, but the performances of abrasion, ground gripping, water drainage and the like of the tire are negatively influenced.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a main groove noise reduction structure in a low-noise tire so as to effectively reduce the noise of the tire without influencing the wear resistance, the ground gripping performance and the drainage performance of the tire.

The invention adopts the following technical scheme for solving the technical problems:

the main groove noise reduction structure in the low-noise tire is characterized in that: the bottom surface of the main groove is provided with regularly arranged conical bulges, and the conical bulges are used for forming convex teeth on the section, perpendicular to the groove flow channel, in the main groove; the regular arrangement is that: the conical protrusions are arranged on the bottom surface of the main groove in a row along the circumferential direction of the tire; the rows are arranged into a single row or a plurality of rows which are arranged in parallel and at intervals.

The main groove noise reduction structure in the low-noise tire is also characterized in that: on any section vertical to the groove flow channel, the convex teeth are the same in shape and size; and the sum of the cross-sectional areas of all the convex teeth is 2-5% of the flow passage surface of the main groove.

The main groove noise reduction structure in the low-noise tire is also characterized in that: in the direction along the channel of the groove, the included angle between the surface of the conical bulge and the side wall of the groove is 0-30 degrees.

The main groove noise reduction structure in the low-noise tire is also characterized in that: the center distance between two adjacent rows of convex teeth is 1-1.5 times of the width of the bottom edge of the convex teeth.

The main groove noise reduction structure in the low-noise tire is also characterized in that: the conical protrusions are regular rectangular pyramids which are identical in shape and size, the combination interface of the regular rectangular pyramids and the bottom surface of the main groove is rhombic, the first diagonal line of two mutually perpendicular diagonal lines of the rhombus is along the flow passage direction of the main groove, and the second diagonal line is perpendicular to the flow passage direction of the main groove; the first diagonals of adjacent right pyramids in the same column are end-to-end or spaced.

The main groove noise reduction structure in the low-noise tire is also characterized in that: setting the relevant dimensions of the regular rectangular pyramid as:

L₁₁＝(1.5～2)L₁₂；L₁₂＝(0.1～0.2)W；H₁＝(0.125～0.25)H；

L₁₁is the length of the first diagonal, L₁₂Is the second diagonal length;

w is the width of the main groove, and H is the depth of the main groove; h₁Is the height of the regular rectangular pyramid.

The main groove noise reduction structure in the low-noise tire is also characterized in that: the conical protrusions are arranged in an array in the circumferential direction of the tire in a long strip shape, the combination interface of the long strip and the bottom surface of the main groove is rectangular, the cross section of the long strip is in the shape of an isosceles triangle, and the bottom side of the isosceles triangle is perpendicular to the direction of the flow channel of the main groove.

The main groove noise reduction structure in the low-noise tire is also characterized in that: setting the relevant dimensions for the strip as:

W₂＝(0.1-0.2)W；H₂＝(0.125～0.25)H；

W₂is the base width of an isosceles triangle H₂Is the height of an isosceles triangle;

w is the width of the main groove, and H is the depth of the main groove.

The main groove noise reduction structure in the low-noise tire is also characterized in that: the conical protrusions and the tire are of an integral structure made of the same materials.

Compared with the prior art, the invention has the beneficial effects that:

1. the conical bulge arranged on the bottom surface of the main groove can effectively improve a turbulent flow structure close to the wall surface in the main groove, reduces the breakage caused by mutual collision and abnormal separation between vortexes, and reduces the intensity and pulsating pressure of turbulent flow, thereby effectively reducing the pneumatic noise of the tire;

2. the invention is different from the existing tire noise reduction means by changing the surface patterns of the tire and adding the noise elimination structure, the conical bulges are arranged on the bottom surface of the main groove, the shape and the arrangement of the patterns of the tire tread are not changed, the influence on the drainage area of the main groove is extremely small, the conical bulges have the flow guiding function, the flow resistance of fluid is reduced, and the performances of wear resistance, ground gripping, drainage and the like of the tire are not sacrificed while the noise reduction effect is achieved.

Drawings

FIG. 1 is a schematic diagram of a main trench noise reduction structure according to the present invention;

FIG. 2 is an enlarged view of a portion of the pyramidal protrusion of FIG. 1;

FIG. 3a is a schematic top view of a single pyramidal protrusion of FIG. 2;

FIG. 3b is a schematic front view of a single pyramidal protrusion shown in FIG. 3 a;

FIG. 4a is a schematic view of another embodiment of the pyramidal protrusions of the present invention;

FIG. 4b is a front view of the pyramidal protrusion shown in FIG. 4 a;

FIG. 5 is a schematic diagram of a noise reduction structure of a bottom surface of a main trench for simulation verification according to the present invention;

fig. 6a and 6b are simulated comparative sound pressure level frequency spectrums at different air flow rates.

Reference numbers in the figures: 1 main groove, 2 conical bulges, 2a regular four-pyramid, 2b strip, 3 tires and 4 tread patterns;

Detailed Description

Referring to fig. 1 and 4a, in the present embodiment, the texture and arrangement form of the tread pattern 4 in the tire 3 are kept unchanged for the pneumatic tire, and the main groove noise reduction structure in the low-noise tire is set as follows: the bottom surface of the main groove 1 is provided with regularly arranged conical bulges 2, and the conical bulges 2 form convex teeth on the section of the main groove vertical to the groove flow channel; the regular arrangement means that: the conical protrusions are arranged on the bottom surface of the main groove in a row along the circumferential direction of the tire; the array is arranged as a single array or a plurality of arrays which are arranged in parallel and at intervals.