CN115157934A

CN115157934A - Tire capable of disturbing air flow and reducing noise

Info

Publication number: CN115157934A
Application number: CN202210858841.0A
Authority: CN
Inventors: 吕佳锋; 陈伊宁; 张维雁; 孙娟
Original assignee: Zhongce Rubber Group Co Ltd
Current assignee: Zhongce Rubber Group Co Ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-10-11

Abstract

The invention relates to the field of tires, in particular to a tire for disturbing air flow and reducing noise, which comprises an inner rib arranged in the middle of a tire tread and outer ribs arranged on two sides of the tire tread, wherein an outer groove depressed towards the inner side of the tire tread is formed between the inner rib and the outer rib; the outside tread groove includes a plurality of sections interconnect's slot section, and the junction of two upper and lower slot sections misplaces each other for be formed with a plurality of departments on the lateral wall of outside tread groove to the protruding vortex structure of slot inboard, the air current flows through the vortex structure, collides with the vortex structure, changes flow direction, noise reduction. The invention has the advantages that: the outer groove has a barbed, meandering shape, and can reduce the noise of the tire by disturbing the flow characteristics of the air flow within the groove.

Description

Tire capable of disturbing air flow and reducing noise

Technical Field

The invention relates to the field of tires, in particular to a tire for disturbing air flow and reducing noise.

Background

Tire noise is noise generated by the interaction of the tires of a running vehicle with the road surface, the interaction of the tires with air, and the deformation of the tires, and is one of two major sources of automotive noise. The research shows that the noise of truck tires becomes the main noise source of the automobile when the driving speed of the automobile reaches 70km/h on dry roads, and the noise of tires becomes the main factor when the driving speed of the automobile is higher than 45 to 55km/h for cars and light trucks.

With the development of the automobile industry, the ordinary tire can not meet the pursuit of people on the performances of high performance, comfort, wear resistance and the like of the tire, and the requirement of people on the noise performance of the tire is higher and higher. The labeling act proposed in the european union clearly proposes the wet grip performance level and the noise level of tires, and similar regulations have been put into practice in japan.

The existing mainstream methods for noise reduction can be classified into the following methods: the sizes of adjacent patterns are different by adjusting the shapes of the patterns, so that noise is dispersed, sound energy superposition is avoided, and the purpose of noise reduction is finally achieved; the size of the groove is reduced, the air volume is reduced, and the compressed and expanded air is reduced, so that the pumping noise is reduced; noise is dispersed by designing different pattern grooves, so that the consistent resonance frequency of air columns in all the grooves is avoided; the longitudinal grooves are additionally provided with the bulges, so that air flow is dispersed, and resonance sound is reduced.

However, even if the above method is adopted, the noise reduction effect is still not good, and with the importance on the comprehensive performance of the tire, a tire with better noise reduction effect needs to be designed.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a tire for disturbing air flow and reducing noise, wherein a spoiler structure protruding inward of a groove is disposed in a groove, so that when air flows through the spoiler structure, the air flow collides with the spoiler structure, thereby changing the air flow characteristics and reducing noise.

For the purpose of the invention, the following technical scheme is adopted for implementation:

a tire for disturbing air flow and reducing noise comprises an inner rib arranged in the middle of a tire tread and outer ribs arranged on two sides of the tire tread, wherein an outer groove depressed towards the inner side of the tire tread is formed between the inner rib and the outer rib, and the inner rib, the outer rib and the outer groove respectively extend along the circumferential direction of the tire tread and form a ring;

the outside tread groove includes a plurality of sections interconnect's slot section, and the junction of two upper and lower slot sections misplaces each other for be formed with a plurality of departments on the lateral wall of outside tread groove to the protruding vortex structure of slot inboard, the air current flows through the vortex structure, collides with the vortex structure, changes flow direction, noise reduction.

Preferably, the groove segments are arranged obliquely.

Preferably, the turbulent flow structure includes: the first or second barb surfaces located on the groove walls of the outer grooves adjacent the inner side of the tread, and the third barb surfaces located on the groove walls of the outer ribs adjacent the outer side of the tread, the first, second and third barb surfaces all extending laterally and into the outer grooves.

Preferably, the inner rib includes first blocks and second blocks arranged alternately,

on the left side edge of the inner pattern rib, the connecting positions of the first left side edge of the first pattern block and the second left side edge of the second pattern block are staggered with each other in the transverse direction to form a first barb surface;

on the right side edge of the inner pattern rib, the connecting positions of the first right side edge of the first pattern block and the second right side edge of the second pattern block are staggered with each other in the transverse direction to form a second barb surface;

the outer pattern rib comprises a plurality of shoulder pattern blocks which are mutually connected, and the connecting positions of the upper shoulder pattern block and the lower shoulder pattern block are mutually staggered in the transverse direction to form a third barb surface.

Preferably, the lower end point of the first left side edge of the first block and the upper end point of the second left side edge of the second block are staggered with each other; the upper end point of the first right side of the first pattern block and the lower end point of the second right side of the second pattern block are staggered mutually.

Preferably, the first left side and the first right side of the first pattern block are straight line segments which are parallel to each other and form an included angle of 5-20 degrees with the central line of the tread; the second left side and the second right side of the second pattern block are straight line segments which are parallel to each other and are parallel to the central line of the tread; the shoulder pattern blocks comprise a first side line and a second side line which are connected with each other, the first side line is parallel to the first left side line, the position of the second side line corresponds to the second pattern block, and the second side line is parallel to the second left side line; the distance between the first borderline and the first pattern block is larger than the distance between the second borderline and the second pattern block.

Preferably, the first block and the second block form a transverse groove extending transversely and having both ends connected to the left and right sides of the inner rib, the transverse groove is obliquely arranged, and a connecting line of the left end point and the right end point of the transverse groove forms an included angle of 10-45 degrees with the tread width direction.

Preferably, the first block and the second block have different outer shapes to disperse noise.

Preferably, the connecting position of the shoulder pattern blocks is provided with a sickle-shaped groove extending towards the outer side of the tread, the inner side of the sickle-shaped groove is communicated with the outer groove, and a step surface is arranged in the sickle-shaped groove.

Preferably, a plurality of heat conduction grooves which are sunken towards the inner side of the tread, extend longitudinally and are distributed transversely are arranged between the upper side edge and the lower side edge of the second pattern block, and the depth of each heat conduction groove is 0-3mm.

In conclusion, the invention has the advantages that: the outer groove has a barbed, meandering shape, and can reduce the noise of the tire by disturbing the flow characteristics of the air flow within the groove. The inclined arrangement of the lateral grooves makes it gradually contact with the ground, thereby reducing noise. The sickle-shaped groove positioned on the tire shoulder can reduce the air pumping noise of the tire by reducing the air compression ratio.

Drawings

Fig. 1 is a schematic view of the structure of a tread pattern.

Fig. 2 isbase:Sub>A cross-sectional view taken atbase:Sub>A-base:Sub>A in fig. 1.

Fig. 3 is a cross-sectional view at B-B in fig. 1.

Fig. 4 is a cross-sectional view at C-C in fig. 1.

Fig. 5 is a cross-sectional view taken at D-D in fig. 1.

Detailed Description

As shown in FIG. 1, a tire has a tire pattern on its tread, specifically comprising an inner rib 1 and an outer rib 2. The inner rib 1 is located in the middle of the tread and extends in the circumferential direction of the tread to form a ring. The outer ribs 2 are located on the left and right sides of the tread (commonly referred to as the shoulders, and therefore also commonly referred to as shoulder ribs), also extending in the circumferential direction of the tread to form a ring shape. An outer groove 3 recessed inward of the tread is formed between the inner rib 1 and the outer rib 2, and the outer groove 3 is formed to extend in the circumferential direction of the tread to form a ring shape because the boundary of the outer groove 3 is defined by the inner rib 1 and the outer rib 2.

For example, referring to fig. 1, two inner ribs 1 are spaced left and right, and an inner groove 4 is formed between the two inner ribs 1. Specifically, the two inner ribs 1 are distributed on the left and right sides of the boundary line between the center lines of the treads. The number of the inner ribs 1 is not limited to two, and may be one, or three or more. When the inner ribs 1 are odd numbered, the center line of the inner rib 1 in the middle coincides with the center line of the tread, and the other inner ribs 1 are distributed on both sides. When the inner ribs 1 are even numbered, the inner ribs 1 are distributed on both the left and right sides of the tread center line in the manner referred to in fig. 1.

As shown in fig. 1, the inner rib 1 includes first blocks 11 and second blocks 12 alternately arranged in the tread circumferential direction, and a laterally extending lateral groove 5 is formed at the junction of the first blocks 11 and the second blocks 12, that is, one lateral groove 5 is formed on each of the upper and lower sides of each first block 11, or on each of the upper and lower sides of each second block 12. The lateral grooves 5 have left and right ends communicating with the outer grooves 3 and/or the inner grooves 4. Specifically, in fig. 1, there are two left and right rows of lateral grooves 5, the left end of the lateral groove 5 on the left side communicates with the outer groove 3 on the left side, and the right end of the lateral groove 5 communicates with the inner groove 4. The right end of the lateral groove 5 on the right side communicates with the lateral groove 5 on the right side, and the left end of the lateral groove 5 communicates with the inner groove 4.

As shown in fig. 1, the first block 11 has a substantially quadrangular shape, and left and right sides of the quadrangular shape are defined as a first left side 111 and a first right side 112, respectively, and upper and lower sides are defined as a first upper side 113 and a first lower side 114, respectively. The first left side 111 and the first right side 112 are first straight lines parallel to each other, and the first straight lines form an included angle with the tread center line, that is, the first left side 111 and the first right side 112 are both obliquely arranged, and the oblique angle is 5-20 °, so that the arrangement can disturb air flow and disturb vibration frequency, thereby reducing noise. The first upper side 113 and the first lower side 114 of the quadrangle are first curve segments protruding upwards and downwards respectively, and the left end point and the right end point of the first upper side 113 are not at the same height, and the left end point and the right end point of the first lower side 114 are not at the same height, so that when the first pattern block 11 is in contact with the ground, the first upper side 113 can be gradually in contact with the ground, and the generated noise is reduced.

As shown in fig. 1, the second block 12 is also substantially quadrangular, but the length of the quadrangle in the longitudinal direction is smaller than that in the transverse direction. The right and left sides of the quadrangle are respectively defined as a second left side 121 and a second right side 122, and the upper and lower sides are respectively defined as a second upper side 123 and a second lower side 124. The second left side 121 and the second right side 122 are second straight line segments parallel to each other, and the second straight line segments are parallel to the tread center line, that is, the second left side 121 and the second right side 122 are vertically arranged. The second upper side 123 and the second lower side 124 of the quadrangle are respectively second curve sections protruding upwards and downwards, the left end point and the right end point of the second upper side 123 are not at the same height, the left end point and the right end point of the second lower side 124 are not at the same height, and when the second pattern block 12 contacts with the ground, the second upper side 123 can gradually contact with the ground, so that noise is reduced.

Comparing the shapes of the first pattern block 11 and the second pattern block 12, the two patterns are obviously different, so that noise is dispersed, superposition of sound energy is avoided, and the purpose of noise reduction is finally achieved.

In addition, it should be noted that the lengths of the two first blocks 11 adjacent up and down (i.e., the lengths of the first left side 111 and the first right side 112) are different, that is, the distance between the two second blocks 12 adjacent up and down is different, and the distance between the shoulder blocks 21 hereinafter is also different, which makes the tire have different pitches, thereby avoiding the noise from being superimposed.

Since the upper and lower boundaries of the lateral groove 5 are defined by the first block 11 and the second block 12, the lateral groove 5 as a whole is a curve that protrudes upward or downward, and the left and right end points of the lateral groove 5 are not at the same height, that is, the lateral groove 5 is disposed obliquely, and the left and right sides of the lateral groove 5 gradually contact the ground when the tire rolls, reducing the noise that occurs. Specifically, the angle between the connecting line of the left end point and the right end point of the transverse groove 5 and the tread width direction is 10-45 °.

As shown in fig. 1, a plurality of heat conduction grooves 6 which are recessed towards the inner side of the tread and extend longitudinally and are distributed transversely are formed between the second upper side edge 123 and the second lower side edge 124 of the second block 12, the depth of each heat conduction groove 6 is 0-3mm, and the heat conduction grooves 6 form a zigzag heat conduction structure (see fig. 2) on the second block 12, the heat conduction structure provides a heat conduction channel, increases the surface area, and can effectively conduct heat and improve the heat radiation performance of the tread.

Be provided with a plurality of vortex structure in outside groove 3 and the inboard groove 4 (if have), the air can collide with the vortex structure when flowing through the vortex structure to form the vortex, change the flow direction originally promptly, disturb the air flow characteristic, reduce the noise that gas motion produced.

As shown in fig. 1, the outer grooves 3 and the inner grooves 4 (if any) are each composed of groove segments which are connected to one another but are offset at the connection, and the groove segments are arranged obliquely, so that the outer grooves 3 and the inner grooves 4 form a meandering shape as a whole, and a turbulent flow structure in the shape of a barb which projects towards the inside of the groove segment is formed in the groove segment, to be precise, barb surfaces are formed on both sides of the groove, and the barb surfaces can be regarded as turbulent flow structures in the above.

Specifically, on the boundary line on the left side of the inner rib 1, the joints of the first left side edge 111 of the first block 11 and the second left side edge 121 of the second block 12 are laterally staggered with each other, so that a first inverted surface 13 is formed; more specifically, the upper end of the first left side 111 of the first block 11 is aligned with the lower end of the second left side 121 of the second block 12, i.e., the groove section is continuous thereto, but the lower end of the first left side 111 of the first block 11 is offset from the upper end of the second left side 121 of the second block 12, i.e., the groove section is offset therefrom, so that the first inverted surface 13 is formed between the lower side of the first block 11 and the upper side of the second block 12.

On the boundary line of the right side of the inner rib 1, the connection positions of the first right side edge 112 of the first pattern block 11 and the second right side edge 122 of the second pattern block 12 are staggered with each other in the transverse direction, so that a second barb surface 14 is formed; more specifically, the upper end of the first right side 112 of the first block 11 is offset from the lower end of the second right side 122 of the second block 12, i.e., the groove segment is offset therefrom, and the lower end of the right side of the first block 11 is aligned with the upper end of the right side of the second block 12, i.e., the groove segment is continuous therefrom. Thereby forming a second barbed surface 14 between the upper side of the first block 11 and the lower side of the second block 12.

The side of the outer groove 3 facing the inner rib 1 is in a zigzag and offset shape due to the presence of the first and second

barbed surfaces

13 and 14. Meanwhile, if the number of the inner ribs 1 is two or more, the inner grooves 4 are also zigzag-shaped.

In order to give the grooves a more tortuous shape, the boundary line of the outer rib 2 is also tortuous, i.e. a third barbed surface 20 is provided on the outer rib 2, the position of the third barbed surface 20 approximately corresponding to the position of the second block 12, which will give the entire outer groove 3 a tortuous shape.

Specifically, the third barbed surface 20 is implemented by: on the outer rib 2, a plurality of shoulder blocks 21 are provided, which are connected to each other, and the joints of the upper and lower shoulder blocks 21 are displaced from each other to form a third barbed surface 20.

When the air current flows in the groove (mainly the outer groove 3), the air current collides with the side wall at the position of the barb surface, the flowing direction of the air is changed, and then turbulent flow is formed, so that the flowing characteristic of the outer air current in the groove is interfered, and the noise generated by the movement of the inner gas of the groove (especially the outer groove 3) is reduced.

Note also that the inner side face of the shoulder block 21 has a first side line 211 and a second side line 212 connected to each other, the first side line 211 being located substantially corresponding to the first block 11, and the first side line 211 being parallel to the first left side 111 (or the first right side 112). The second edge 212 is located substantially corresponding to the second block 12, and the second edge 212 is parallel to the second left side 121 (or the second right side 122) of the second block 12. The distance between the first edge 211 and the first block 11 is greater than the distance between the second edge 212 and the second block 12, that is, the groove width of the outer groove 3 is not uniform, which can change the flow characteristics of air in the groove, which is advantageous for reducing noise.

As shown in fig. 3, a sickle-shaped groove 7 extending outward in the transverse direction is provided on the third barb surface 20 of the shoulder block 21, the inner end of the sickle-shaped groove 7 is communicated with the outer groove 3, and the section of the sickle-shaped groove 7 in the depth direction is stepped, that is, a step surface 71 is provided inside the sickle-shaped groove 7. During tire travel, when the blocks are in contact with the ground, pumping noise may be generated due to the pumping effect. Because the sickle-shaped groove 7 is internally provided with the step surface 71, the sickle-shaped groove has certain rigidity and can bear certain acting force when the pattern blocks are contacted with the ground, so that the pattern groove deformation is reduced, the volume change of the groove cavity is reduced, the air compression ratio is reduced, and the pumping noise of the tire is reduced.

The Helmholtz resonance sound absorption principle is widely applied to reducing the resonance of an aircraft engine, and also applied to exhaust pipes of motorcycles and automobiles.

As shown in FIG. 4, the first sound absorbing structure 8 extending toward the inside of the tread is provided on the side wall of the outer groove 3 near the outer side of the tread, a plurality of the first sound absorbing structures 8 are provided at intervals in the extending direction of the outer groove 3, the first sound absorbing structure 8 includes a first passage 81 extending inwardly from the side wall surface of the outer groove 3, and the first passage 81 has a narrow-neck cylindrical shape, where the narrow neck is a diameter relative to the first spherical cavity 82 described later, which must be smaller than the diameter of the first spherical cavity 82, and preferably smaller than one-half of the first spherical cavity 82. The axis of the first passage 81 is parallel to the width direction of the tire. A first spherical cavity 82 is provided at the end of the first passage 81, the spherical center of the first spherical cavity 82 being located on the axis of the first passage 81. When the tire driving process, the noise is generated, the first sound absorption structure 8 can absorb the noise with a certain frequency, and the air can vibrate in the first spherical cavity 82, so that the air can rub against the inner wall of the first spherical cavity 82 to generate heat energy, so that the sound energy is converted into mechanical energy firstly and then into internal energy to achieve the sound absorption effect.

As shown in fig. 5, the second sound absorbing structure 9 extending toward the inside of the tread is provided at the bottom of the lateral groove 5, a plurality of the second sound absorbing structures 9 are provided at intervals in the extending direction of the lateral groove 5, the second sound absorbing structure 9 includes a second channel 91 extending downward from the bottom of the lateral groove 5, and the second channel 91 is in the shape of a narrow-neck cylinder, where the diameter of the narrow-neck is smaller than the diameter of the second spherical cavity 92, and preferably smaller than one-half of the diameter of the second spherical cavity 92, with respect to the second spherical cavity 92 described later. The axial direction of the second channel 91 is parallel to the normal direction of the tread position of the second channel 91, more precisely, the axis of the second channel 91 intersects the line around which the tire rotates. A second spherical cavity 92 is provided at the end of the second passage 91, and the center of the sphere of the second spherical cavity 92 is located on the axis of the second passage 91. When the tire driving process, the noise is generated, the second sound absorption structure 9 can absorb the noise with a certain frequency, and the air can vibrate in the second spherical cavity 92, so that the air can rub against the inner wall of the second spherical cavity 92 to generate heat energy, so that the sound energy is converted into mechanical energy firstly and then into internal energy to achieve the sound absorption effect.

It should be noted that, the first sound absorbing structure 8 and the second sound absorbing structure 9 can be used simultaneously, or only one of them can be used, and generally, the sound absorbing effect achieved by the first sound absorbing structure 8 is better than that achieved by the second sound absorbing structure 9. The specific parameters of the first and second sound-absorbing

structures

8, 9 can be referred to the structure of the helmholtz resonator.

In summary, the present invention has the advantage that the first sound absorbing structure 8 and the second sound absorbing structure 9 can reduce noise during running of the tire by resonance sound absorption. The sickle-shaped groove 7 positioned at the tire shoulder can reduce the air pumping noise of the tire by reducing the air compression ratio. The outer groove 3 has a barbed meandering shape, and can reduce the noise of the tire by disturbing the flow characteristics of the air flow within the groove. The inclined arrangement of the transverse grooves 5 makes it gradually come into contact with the ground, thereby reducing noise. The zigzag heat conduction structure 6 is arranged on the surface of the second pattern block 12, so that a heat conduction channel is provided, heat can be effectively conducted, and the heat radiation performance of the tire is improved.

Claims

1. A tire for disturbing air flow and reducing noise comprises an inner rib (1) arranged in the middle of a tire tread and outer ribs (2) arranged on two sides of the tire tread, wherein an outer groove (3) which is sunken towards the inner side of the tire tread is formed between the inner rib (1) and the outer rib (2), and the inner rib (1), the outer rib (2) and the outer groove (3) respectively extend along the circumferential direction of the tire tread and form a ring shape;

it is characterized in that the preparation method is characterized in that,

outside tread groove (3) include a plurality of sections interconnect's slot section, and the junction of two upper and lower slot sections misplaces each other for be formed with a plurality of departments on the lateral wall of outside tread groove (3) to the protruding vortex structure of slot inboard, the air current flows through the vortex structure, collides with the vortex structure, changes flow direction, noise reduction.

2. A tire for disrupting airflow to reduce noise as claimed in claim 1 wherein the groove segments are inclined.

3. A turbulent air flow noise reducing tire as claimed in claim 1, wherein the turbulent flow structure comprises: a first barb surface (13) or a second barb surface (14) located on the groove wall of the outer groove (3) near the inner side of the tread, and a third barb surface (20) located on the groove wall of the outer rib (2) near the outer side of the tread, the first barb surface (13), the second barb surface (14) and the third barb surface (20) all extending laterally and into the outer groove (3).

4. A tire for disturbing air flow and reducing noise according to claim 1, wherein the inner rib (1) comprises first blocks (11) and second blocks (12) arranged alternately,

on the left side of the inner rib (1), the connection positions of the first left side (111) of the first pattern block (11) and the second left side (121) of the second pattern block (12) are staggered with each other in the transverse direction to form a first barb surface (13);

on the right side of the inner rib (1), the connection positions of the first right side (112) of the first pattern block (11) and the second right side (122) of the second pattern block (12) are staggered with each other in the transverse direction to form a second barb surface (14);

the outer pattern rib (2) comprises a plurality of shoulder pattern blocks (21) which are mutually connected, and the connection positions of the upper shoulder pattern block (21) and the lower shoulder pattern block (21) are mutually staggered in the transverse direction to form a third barb surface (20).

5. A tire for disturbing airflow and reducing noise according to claim 4, wherein the lower end point of the first left side (111) of the first block (11) and the upper end point of the second left side (121) of the second block (12) are offset from each other; the upper end point of the first right side (112) of the first pattern block (11) and the lower end point of the second right side (122) of the second pattern block (12) are staggered with each other.

6. A tire for disturbing airflow to reduce noise as claimed in claim 4, wherein the first left side (111) and the first right side (112) of the first block (11) are straight segments parallel to each other and forming an angle of 5-20 ° with the tread center line; a second left side (121) and a second right side (122) of the second pattern block (12) are straight segments which are parallel to each other and are parallel to the center line of the tread; the shoulder pattern block (21) comprises a first side line (211) and a second side line (212) which are connected with each other, the first side line (211) is parallel to the first left side edge (111), the position of the second side line (212) corresponds to the second pattern block (12), and the second side line (212) is parallel to the second left side edge (121); the distance between the first edge line (211) and the first block (11) is greater than the distance between the second edge line (212) and the second block (12).

7. A tire for disturbing air flow and reducing noise according to claim 4, wherein the first block (11) and the second block (12) form between them a lug groove (5) extending in the lateral direction and having both ends connected to the left and right sides of the inner rib (1), the lug groove (5) is disposed obliquely, and the line connecting the left and right ends of the lug groove (5) forms an angle of 10-45 ° with the tread width direction.

8. A tire for disturbing airflow and reducing noise according to claim 4, wherein the first block (11) and the second block (12) have different shapes to disperse noise.

9. A tire for disturbing air flow and reducing noise according to claim 4, wherein the junction of the shoulder blocks (21) is provided with a sickle-shaped groove (7) extending to the outer side of the tread, the inner side of the sickle-shaped groove (7) is communicated with the outer groove (3), and a step surface (71) is arranged in the sickle-shaped groove (7).

10. A tyre for disturbing air flow and reducing noise as claimed in claim 4, wherein a plurality of heat conducting grooves (6) are provided between the upper side (123) and the lower side (124) of the second block (12), which grooves are recessed towards the inner side of the tread and extend longitudinally and are distributed transversely, the depth of the heat conducting grooves (6) being 0-3mm.