CN112895811A

CN112895811A - Low-noise and high-wet-slip tire

Info

Publication number: CN112895811A
Application number: CN202110071416.2A
Authority: CN
Inventors: 周鹏飞; 李昭; 樊军伟; 李国瑞; 任丙杰; 何昌伟; 郑永粮
Original assignee: Aeolus Tyre Co Ltd
Current assignee: Aeolus Tyre Co Ltd
Priority date: 2020-01-23
Filing date: 2021-01-19
Publication date: 2021-06-04
Also published as: CN111137071A

Abstract

The invention provides a low-noise high-wet-slip tire, which comprises a tread pattern, wherein the tread pattern comprises a pattern groove, and two side walls of the pattern groove are respectively provided with a fish scale-shaped concave-convex structure. Can increase fish scale concave-convex structure through at the decorative pattern groove wall to disturb outside air current at the flow characteristic of groove inslot, reduce the noise that groove especially vertical decorative pattern groove inside gas motion produced, simultaneously, the design of scale-like concave-convex groove increases the pressure of decorative pattern groove wall and fluid, increases fluidic velocity of flow, thereby improves the drainage performance of product, also is favorable to the drawing of patterns.

Description

Low-noise and high-wet-slip tire

Technical Field

The invention relates to a tire, in particular to a low-noise and high-wet-skid tire.

Background

With the increasing number of vehicles and the increasing requirements of human beings on the safety and comfort of the vehicles, various countries in the world begin to develop a restricted admission standard for performance in the tire industry, and in 2009, the european union newly promulgates EC661/2009, "requirements for general safety driving certification of the european union, and EC1222/2009," tire labels related to fuel efficiency and other parameters ", which specifically require tire rolling resistance, wet road grip and road noise, and definitely require tire labels related to the tire wet road grip performance level and noise level, and the requirements begin to be implemented at 7/1 of 2012. Similar regulations have been implemented in japan, and in recent years, china has prepared similar label law regulations.

With the development of social economy, the concepts of 'comfort', 'safety' and 'environmental protection' are deeply enjoyed, and higher requirements are put forward on the wet-skid resistance and the noise resistance of the automobile tire. The wet skid and noise resistance of a tire is closely linked to the flow of the fluid medium in the pattern structure and the pattern grooves, and presents an irreconcilable contradiction: on one hand, the volume of the pattern blocks is reduced by increasing the volume of the pattern grooves, which is beneficial to improving the drainage capacity of the pattern, thereby improving the wet skid resistance of the tire; on the other hand, the space volume of the groove is increased, and the noise of the tire is increased. Because of the existence of the contradiction, the current tire pattern structure design method only can accept and take the mismatching reality into consideration, and for this reason, it is necessary to explore and research new tire pattern design theories and methods to solve the contradiction between tire noise and wet skid resistance.

With the continuous and intensive research, in order to improve the comprehensive performance of the tire, tire scientists are no longer limited to the theoretical design method of the traditional pattern, and have begun to explore the design of the tire pattern by using biological information. The Korean Tai tyre company develops the asymmetric pattern of the imitated phoenix totem, can effectively discharge accumulated water when the tyre runs, minimizes the 'hydroplaning phenomenon', adopts soft smooth transition treatment, and effectively reduces resonance sound. "Baoli bubble" proposed by Goodyear corporation, namely, hemispherical bulges and depressions which can be mutually engaged are manufactured between the tire pattern grooves to inhibit the deformation of pattern blocks, so that the tire noise can be reduced while the grip force is improved; the donyo (Toyo) tire proposes a silent wall concept, i.e. the zigzag grooves are densely distributed on the sidewall of the tire groove, and the turbulence effect of the silent wall reduces the tire noise. Although the invention patents of the Chinese patent publications '201310560419.8' and '201210342761.6' use a bionic non-smooth structure to improve the noise and hydroplaning performance of the tire, the design of the bionic pattern cannot ensure that the gripping capability of the tire is not sacrificed after the tire is worn, because the ground contact area of the pattern from beginning to end does not show an increasing trend, the original patents (Chinese patent publications '201310560419.8' and '201210342761.6') add bionic sipes on the surface of the pattern, the action life in the depth direction is short, the patent does not add the scaly design on the surface of the pattern, but the eastern ocean (Toyo) tire uses the dense serrated grooves, and the noise is still larger, and the better noise reduction effect cannot be generated. With the implementation of European Union regulatory labels, the popularization of green tires and the attention on the comprehensive performance of tires, a tire with an innovative design concept is needed to meet the market demand.

The invention improves the fluid passing capacity of the groove and reduces the noise generated by the pattern by adopting the fish-scale-like non-smooth pattern groove wall.

Disclosure of Invention

To solve the above problems, the present invention provides a low-noise, high-wet-skid tire, in which a fish-scale-like concavo-convex structure is arranged on the groove, particularly the sidewall of a longitudinal groove, to disturb fluid noise generated in the tire groove, particularly the longitudinal groove, thereby reducing noise, and at the same time, to improve the water flow passage performance of the groove, particularly the longitudinal groove, on a wet road surface, to provide a sufficiently high hydroplaning speed and low tire noise for a vehicle.

Compared with the prior art, the invention can interfere the flowing characteristic of external airflow in the groove of the pattern groove by adding the scale-shaped concave-convex structure on the wall of the pattern groove, so as to reduce the noise generated by the movement of the gas in the groove, particularly the longitudinal pattern groove, and meanwhile, the design of the scale-shaped concave-convex groove increases the pressure between the wall of the pattern groove and the fluid, increases the flow velocity of the fluid, improves the drainage performance of the product and is also beneficial to demoulding.

The invention can be applied to all tire designs with grooves, the grooves can be transverse grooves, longitudinal grooves, oblique grooves or arc grooves, the tire noise is reduced on the basis of not sacrificing the comprehensive performances of the original tire, such as rolling resistance and the like, the wet skid resistance of the tire is improved, and the appearance is attractive and elegant.

Drawings

FIG. 1 is a schematic view of the tread pattern of the tire of the present invention; in the figure, a and b are respectively corresponding side walls a^，、b^，C and d are respectively corresponding side walls c^，、d^，E and f are corresponding side walls e^，、f^，G and h are corresponding side walls g^，、h^，Fish scale-shaped concave-convex structure.

FIG. 2 is a-a in FIG. 1^，Schematic cross-sectional view of a tire longitudinal groove.

FIG. 3 is b-b in FIG. 1^，Schematic cross-sectional view of a tire longitudinal groove.

FIG. 4 is a schematic view of a fish scale relief on the sidewalls of the longitudinal grooves.

FIG. 5 is a schematic perspective view of a fish scale-like convex-concave structure;

fig. 6 is a schematic diagram of the arrangement of parameters of the fish scale-like convex-concave structure.

FIG. 7 is a model setup diagram in a noise analysis of the longitudinal groove wall surface.

FIG. 8 is a diagram of a longitudinal groove calculation model and boundary conditions.

Fig. 9 is a graph of a single groove noise spectrum under four schemes.

Fig. 10 is a schematic top view of a scale structure.

Fig. 11 is a cross-sectional view taken along the line of point E, F in fig. 10.

Fig. 12 is a first cross-sectional view taken along the line of point H, J in fig. 10.

Fig. 13 is a second cross-sectional view taken along the line of point H, J in fig. 10.

Fig. 14 is a cross-sectional view three of fig. 10 taken along the line of point H, J.

Detailed Description

As shown in fig. 1-6 and 10-11, a low-noise high-wet-skid tire comprises a tread pattern, wherein the tread pattern comprises a groove, and two side walls of the groove are respectively provided with a fish scale-shaped concave-convex structure.

The tread pattern comprises a longitudinal pattern groove 20, and two side walls of the longitudinal pattern groove are respectively provided with a fish scale-shaped concave-convex structure 15 arranged along the circumferential direction of the tire side wall. Or the two side walls are provided with the fish scale concave-convex structure pattern grooves, the longitudinal pattern grooves are arranged along the circumferential direction of the tire, and the fish scale concave-convex structures are arranged along the circumferential direction of the longitudinal pattern grooves, so that the two side walls of the longitudinal pattern grooves are respectively provided with the circumferential fish scale concave-convex structures. As shown in FIG. 1, the two side walls of the four circumferentially arranged longitudinal grooves are, respectively, side walls a in the order from left to right^，、b^，、c^，、d^，、e^，、f^，、g^，、h^，Side wall a^，、b^，、c^，、d^，、e^，、f^，、g^，、h^，The corresponding fish scale concave-convex structures are a, b, c, d, e, f, g and h respectively.

The bottom surface in the longitudinal groove is provided with stone discharging platforms, adjacent stone discharging platforms are connected through reinforcing ribs, and the stone discharging platforms in each longitudinal groove are connected to form a wavy line structure. The stone removing platform increases the stone removing performance of the longitudinal pattern groove bottom and increases the tear resistance of the groove bottom of the tire. And the design of the stone removing table can ensure that the product has good fluid passing performance after being grounded, and the water-skid resistance of the product is improved.

The tread pattern includes also circumferential pattern ribs, with the longitudinal pattern grooves being arranged circumferentially of the tire, the circumferential pattern ribs and the longitudinal pattern grooves being arranged at intervals. The rib corresponds to a block.

The rib of the pattern is provided with even arc-shaped cutter grooves, and two ends of each arc-shaped cutter groove are connected with adjacent longitudinal pattern grooves. The arc-shaped cutter groove can generate good braking force and has good wet and skid performance; the heat radiation performance of the tire is improved, so that the durability of the tire is improved; meanwhile, the design of the arc-shaped cutter groove reduces the rigidity of the rib of the decorative pattern, and is beneficial to turning of the vehicle. Finally, the design of the arc-shaped cutter groove properly divides the pattern rib, thereby improving the aesthetic property of the tire.

All adjacent arcuate sipe links may form a smooth arc.

During the process of forming the tire in the mold, steel sheets with different depths on the mold are embedded on the pattern ribs, and after the tire is formed and demolded, arc-shaped cutter grooves are formed on the pattern ribs.

The transverse section of the longitudinal grooves is in an inverted trumpet shape, namely the transverse section of the longitudinal grooves becomes smaller from the upper opening to the bottom opening.

The depth of the longitudinal groove is 5-18mm, and the width is 3-14 mm; the fish-scale convex-concave structure is positioned on the side wall of the longitudinal groove at a position with a depth of 0-D from the longitudinal groove, the depth of the longitudinal groove is D, and the ratio of D/D is 50-85%.

Scales of the fish-scale convex-concave structure are regularly arranged, such as: the fish scale-shaped convex-concave structure is formed by sequentially transversely moving scales positioned in the same oblique row to the left side or the right side by the distances of S, 2S, 3S, 4S and 5S … … nS (n is an integer greater than or equal to 1, S is smaller than L, and L is the diameter of the major axis of an ellipse), and corresponding scales with the moving distance of S form intersection; one scale can get another adjacent scale by moving distance A in the transverse direction and distance B in the longitudinal direction, and a cross is formed between two adjacent scales.

The scale may be in the shape of:

taking any one ellipse as a reference, the ellipse is respectively subjected to transverse displacement +/-A and longitudinal displacement +/-B to form four ellipses. And finally, uniformly reserving the upper side or the lower side of each ellipse at the joint of all the ellipses in the longitudinal direction, and uniformly reserving the left side or the right side of each ellipse in the transverse direction, thereby forming a fish scale-shaped structure connected with each other, wherein the reserved part of each ellipse is a scale structure. The formed fish scale-shaped structure is positioned on the same horizontal row, the horizontal distance between every two adjacent scales is 2A, and the longitudinal distance between every two adjacent scales is 2B. The diameter L of the long axis of the ellipse is 5-8mm, the diameter H of the short axis is 3-5mm, and the value range of H/L is 60-65%; at the moment, the value of A is 4mm-6mm, the value of B is 1.5mm-3.5mm, the value range of B/A is between 35% and 60%, A is less than L, B is less than H, and S is less than L. Preferably, A is less than or equal to L/2, B is less than or equal to H/2, and S is less than or equal to L/2. The scale at this time is an elliptical scale structure.

Each scale structure is progressively thinner from the curved edge lying on the elliptical contour to the edge not lying on the elliptical contour.

The thickness of the arc-shaped edge of the scale structure on the oval contour line is the same.

The scale may be in the shape of:

taking any circle as a reference, the circle is respectively subjected to transverse displacement +/-A and longitudinal displacement +/-B to form four circles. And finally, uniformly reserving the upper side or the lower side of each circle at the joint of all the circles in the longitudinal direction, and uniformly reserving the left side or the right side of each circle in the transverse direction, so that a mutually connected fish scale-shaped structure is formed, and the reserved part of each circle is a scale-shaped structure. The formed fish scale-shaped structure is positioned on the same horizontal row, the horizontal distance between every two adjacent scales is 2A, and the longitudinal distance between every two adjacent scales is 2B. The radius R of the circle is 2.5-3.5mm, A is 3.5-5.5 mm, B is 1.2-1.8 mm, B/A is in the range of 35-60%, A is less than 2R, B is less than 2R, S is less than 2R, preferably, A is less than or equal to R, B is less than or equal to R, and S is less than or equal to R. The scale at this time is a round scale structure. Here the circle is a special ellipse, L = 2R.

Each scale structure is progressively thinner from the curved edge lying on the elliptical contour to the edge not lying on the elliptical contour. The schematic top surface of the scale structure can be shown in fig. 10, where in fig. 10, the endpoints are H, J and E, and F is the center point of the arc HJ; the cross-sectional view of FIG. 10 taken along the line defined by point E, F is shown in FIG. 11, with the upper surface of the cross-sectional view being defined by line EF and the lower surface of the cross-sectional view being defined by line E^，F^，At this time, the end point E^，Coinciding with E, in cross-section, the corner F may be a rounded corner; the angle beta formed between the upper surface 16 of the scale and the lower surface 17 of the scale is 1-20 deg., preferably, the angle beta formed between the upper surface 16 of the scale and the lower surface 17 of the scale is 15 deg.. FIG. 12 is a sectional view of a line drawn from point H, J on FIG. 10, where the sectional view has an upper surface taken along line JH and a lower surface taken along line J^，H^，In the cross-sectional view of fig. 12, the thickness of each scale structure is equal from the middle to both sides; in cross-section, the corners J, H may be rounded.

Each scale structure may also be shell-shaped, the thickness of each scale structure gradually becomes thinner from the middle to two sides, as shown in fig. 13 and 14, the cross-sectional view of the straight line on which the point H, J is located on fig. 10 is shown in fig. 13 or 14, on the cross-sectional view of fig. 13, the upper surface is an arc JH, and the lower surface is a line segment J^，H^，In cross-sectional view 13, corners J, H may be rounded. In the cross-sectional view of FIG. 14, the upper surface is arc JH and the lower surface is line J^，H^，At this time, the terminal point J^，Coincident with J, end point H^，Coinciding with H.

The thickness of the arc-shaped edge of the scale structure on the circular contour line is the same.

The scale of the longitudinal groove is only similar to the scale in external shape, but each scale cannot be opened, but each scale is fixedly connected with or integrated with the surrounding scale or the bottom of any one of the scales is integrated with the side wall of the longitudinal groove.

Specifically, as shown in fig. 1, the tread pattern comprises circumferential pattern ribs I1, longitudinal pattern grooves I, pattern ribs II 2, longitudinal pattern grooves II, pattern ribs III 3, longitudinal pattern grooves III, pattern ribs IV 4, longitudinal pattern grooves IV and pattern ribs V5 which are arranged at intervals, and stone removing platforms I6, stone removing platforms II 7, stone removing platforms III 8 and stone removing platforms IV 9 are respectively arranged on the longitudinal pattern grooves I, the longitudinal pattern grooves II, the longitudinal pattern grooves III and the longitudinal pattern grooves IV.

The pattern rib II 2, the pattern rib III 3 and the pattern rib IV 4 are respectively provided with an arc-shaped cutter groove I12, an arc-shaped cutter groove II 13 and an arc-shaped cutter groove III 14. The arc knife grooves I12, II 13 and III 14 are connected to form a smooth arc.

The tread pattern also comprises a tire shoulder pattern, the tire shoulder pattern comprises transverse tire shoulder cutter grooves which are uniformly arranged at tire shoulder parts at two sides, and the transverse tire shoulder cutter grooves are closed cutter grooves. The width of the closed cutter groove is less than 8mm, and the depth is less than 5 mm.

And a transverse tire shoulder cutter groove is added at the tire shoulder part, the width of the closed cutter groove is less than 8mm, the depth of the closed cutter groove is less than 5mm, heat dissipation is carried out, and the product is ensured to have better rolling resistance performance and abnormal wear resistance.

The fish scale-shaped convex-concave structure mainly means that the outer surface of a groove side wall provided with the fish scale-shaped convex-concave structure is fish scale-shaped, and the inner part of the side wall is solid.

And (3) testing:

firstly, the scale is in a round scale structure. The dimensions of the different fish scale relief structures are shown in table 1 below, and the schematic setting of the parameters of the fish scale relief structures is shown in fig. 6.

TABLE 1 parameters of different protocols

	The radius of the circular arc/mm, namely R	Distance between centers of adjacent arcs in same row From/mm, i.e. S or A	The longitudinal distance of the circle centers between the two adjacent rows/mm, i.e. B	Fish scale upper surface and patternIncluded angle of groove wall surface Degree/° i.e. beta	The radius of the arc at the bottom of the pattern groove is/mm, namely r
						Scheme 1	2	3	1	15	3.5
Scheme 2	3	4.5	1.5	15	3.5
						Scheme 3	4	6	2	15	3.5

Scheme 4 is that the fish scale-shaped convex-concave structure is not arranged on the groove, the radius of the circular arc at the bottom of the groove is 3.5mm as that of scheme 1, scheme 2 and scheme 3, and the conditions of the other schemes 4 are the same. The angle beta between the upper surface of the scale and the wall surface of the groove is the angle formed between the upper surface of the scale and the lower surface of the scale.

Second, pattern noise analysis method

2.1 mesh model

In combination with a heavy duty tire footprint length of about 200mm, grooves under four different scenarios were treated to 200mm to reflect the length of the tire when grounded. In the case of the four schemes, the dimension was set to 0.25mm near the side walls of the longitudinal grooves and 0.75mm near the middle regions of the longitudinal grooves. The total number of grids of the four schemes is about 200 ten thousand.

2.2 boundary conditions

The model is respectively provided with an air inlet, an air outlet, a longitudinal groove wall surface (comprising the longitudinal groove wall surface and a road surface) and the like, 2 sound pressure measuring points are arranged at the positions away from the outlets, and the arrangement is specifically shown in figure 7. Setting the air inlet speed to be 80km/h, and calculating the noise under different schemes by adopting a method of large vortex simulation and FH-W sound class ratio. The obtained longitudinal groove calculation model and boundary condition map are shown in fig. 8.

Third, result analysis

Fig. 9 shows a single groove noise spectrum curve under four schemes. The main purpose of the analysis is to explore the influence of the non-smooth scale design of the groove wall on noise, so that the noise value of the simulation result is small.

As can be seen from fig. 9, while solution 2 exhibits a noise reduction effect, solution 1 and solution 3 do not exhibit the expected noise reduction effect, which reflects, to a certain extent, that there is a relatively good parameter for the size of the fish scales if the groove walls are subjected to a non-smooth fish scale treatment.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.

Claims

1. A low noise, high wet skid performance tire comprising a tread pattern comprising grooves, characterized in that: and two side walls of the pattern groove are respectively provided with a fish scale-shaped concave-convex structure.

2. A low noise, high wet skid tire according to claim 1, wherein: the two side walls are provided with fish scale concave-convex structural pattern grooves, and the two side walls of the longitudinal pattern grooves are respectively provided with circumferential fish scale concave-convex structures.

3. A low noise, high wet skid tire according to claim 2, wherein: the bottom surface in the longitudinal groove is provided with a stone discharging table, the continuous stone discharging tables are connected through reinforcing ribs, and the stone discharging tables in each longitudinal groove are connected to form a wavy line structure.

4. A low noise, high wet skid tire according to claim 2, wherein: the tread pattern also comprises circumferential pattern ribs, the longitudinal pattern grooves are arranged along the circumferential direction of the tire, and the circumferential pattern ribs and the longitudinal pattern grooves are arranged at intervals; the rib of the pattern is provided with even arc-shaped cutter grooves, and two ends of each arc-shaped cutter groove are connected with adjacent longitudinal pattern grooves.

5. A low-noise, high-wet-skid tire according to claim 4, wherein: all adjacent curved sipes are connected to form a smooth curve.

6. A low-noise, high-wet-skid tire according to claim 4, wherein: the arc-shaped knife groove is formed by embedding steel sheets with different depths on the pattern rib.

7. A low noise, high wet skid tire according to claim 2, wherein: the depth of the longitudinal groove is 5-18mm, and the width is 3-14 mm; the fish-scale convex-concave structure is positioned on the side wall of the longitudinal groove at a position with a depth of 0-D from the longitudinal groove, the depth of the longitudinal groove is D, and the ratio of D/D is 50-85%.

8. A low noise, high wet skid tire according to claim 1, wherein: each scale of the fish scale-shaped convex-concave structure is positioned on an ellipse, the diameter L of the major axis of the ellipse is 5-8mm, the diameter H of the minor axis of the ellipse is 3-5mm, and the value range of H/L is 60% -65%; the fish scale-shaped convex-concave structure is formed by sequentially transversely moving scales in the same oblique row to the left side or the right side by distances of S, 2S, 3S, 4S and 5S … … nS, wherein n is an integer greater than or equal to 1, and S is smaller than L; one scale can obtain the other adjacent scale by moving a distance A in the transverse direction and a distance B in the longitudinal direction; the value of A is 4mm-6mm, the value of B is 1.5mm-3.5mm, the value range of B/A is between 35% and 60%, A is less than L, B is less than H; or each scale of the fish scale-shaped convex-concave structure is positioned on a circle, the diameter R of the circle is 2.5-3.5mm, the fish scale-shaped convex-concave structure is formed by sequentially and transversely moving the scales positioned on the same oblique row to the left side or the right side by distances of S, 2S, 3S, 4S and 5S … … nS, n is an integer greater than or equal to 1, and S is smaller than 2R; one scale of adjacent scales in the same oblique row moves a distance A in the transverse direction and a distance B in the longitudinal direction to obtain the other adjacent scale; the value of A is 4mm-6mm, the value of B is 1.5mm-3.5mm, A is less than 2R, and B is less than 2R.

9. A low noise, high wet skid tire according to claim 8, wherein: l/2 is less than or equal to A, H/2 is less than or equal to B, L/2 is less than or equal to S, and the thicknesses of the arc-shaped edges of the scale structures on the elliptical contour line are the same; or R is more than or equal to A, R is more than or equal to B, R is more than or equal to S, and the thicknesses of the arc-shaped edges of the scale structures positioned on the circular contour line are the same; the angle between the upper surface of the scale and the lower surface of the scale is 1-20 degrees.

10. A low noise, high wet skid tire according to claim 9, wherein: the included angle formed between the upper surface of the scale and the lower surface of the scale is 15 degrees.