Noise reduction tire

Abstract

One embodiment of the present invention provides a noise reduction tire that reduces noise generated by air column resonance generated in a main groove and prevents a surface layer from becoming rough during mold casting by forming a fluid flow path. According to an embodiment of the present invention, a noise reduction tire includes a plurality of blocks formed on a tread, a groove formed between the blocks and formed to extend in a circumferential direction of the tire, a protruding portion including a plurality of protrusions formed to protrude on a bottom surface and a wall surface of the groove and extending along the groove, and a fluid flow path, and a dividing member formed along a wall surface of the groove and traversing the protruding portion to divide the protruding portion so as to move the fluid located in the protruding portion.

Description

Technical Field

[0001] The present invention relates to a noise reduction tire, and more particularly, to a noise reduction tire that reduces noise generated by air column resonance generated in main grooves and prevents a surface layer from becoming rough during a mold casting process by forming a fluid flow path. Background Art

[0002] In order to reduce noise such as engine sound and wind sound from inside and outside the vehicle while driving, sound insulation materials, sound absorbing materials, etc. are usually used to block the noise.

[0003] Previously, the focus was on reducing the noise generated inside the vehicle, such as from the engine, but recently, with the implementation of the tire noise performance labeling system in South Korea since 2020 and in Europe since 2003, the demand for technology to minimize the noise generated outside the vehicle (such as tires) is increasing.

[0004] In particular, tires for electric vehicles, which have seen a sharp increase in market share recently, require different noise characteristics from those for internal combustion engines (ICE). Specifically, in the case of ICE vehicles, the noise from the engine causes the largest noise in the overall interior noise range. However, electric vehicles do not have an engine, so the overall noise level is lower, which makes low-noise tires even more important.

[0005] Among the noise generated by the tire, the peak due to pipe resonance appears in the 1kHz range, and the impact caused by this occurs in a very large proportion of the overall noise. Specifically, when the main groove in the running direction of the tire touches the ground, it forms a tube shape, and the flow of air flowing through the tube generates an air column resonance sound in the 1kHz band.

[0006] Korean authorized patent No. 1779879 (invention name: tire resonance noise reduction device) discloses: a rim; a tire, which is connected to the rim and whose inner surface is separated from the rim along the radial direction of the rim; a blocking part, which is installed on the outer peripheral surface of the rim, and when the tire rotates, one end of which is connected to the rim and the other end rotates along the circumferential direction of the tire to block a part or all of the space between the rim and the tire; and a restoration part, which restores the other end of the blocking part to the rim side when the tire stops.

[0007] However, in order to reduce the air column resonance sound, a knurling structure is formed in the past, but the knurling structure has a weak noise dispersion effect. In addition, the knurling structure formed in the main groove of the current tire is mostly unable to improve the wet performance or effectively reduce noise as a design factor.

[0008] Therefore, there is a need for a technology for effectively reducing noise generated by air column resonance generated in the main groove.

[0009] Prior art literature

[0010] Patent Literature

[0011] Korean authorized patent No. 1779879. Summary of the invention

[0012] Problem that the invention aims to solve

[0013] An object of the present invention to solve the above-mentioned problems is to provide a noise reduction tire for reducing noise generated by air column resonance generated in main grooves.

[0014] Another object of the present invention is to prevent the surface layer from becoming rough due to the inability of moisture to escape during mold casting by forming a fluid flow path.

[0015] Another object of the present invention is to confirm the degree of wear of a tire by forming a wear indicator.

[0016] In addition, an object of the present invention is to measure the exact height of the wear indicator by forming the wear indicator on a flat surface.

[0017] The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems. From the following description, those skilled in the art can clearly understand other unmentioned technical problems.

[0018] Means used to solve problems

[0019] The noise reduction tire of the present invention for achieving the above-mentioned purpose comprises: a plurality of blocks formed on the tread, grooves formed between the blocks and formed to extend in the circumferential direction of the tire, protrusions comprising a plurality of protrusions formed to protrude from the bottom surface and the wall surface of the groove and extend along the groove, and a fluid flow path formed along the wall surface of the groove to provide a flow path for the air in the groove, the fluid flow path discharges fluid droplets located at the protrusion to the outside of the tire.

[0020] In an embodiment of the present invention, the width of the fluid flow path may be 0.03 mm to 5 mm.

[0021] In an embodiment of the present invention, the noise reduction tire may further include: an air slag formed in a groove shape in the groove.

[0022] In an embodiment of the present invention, the noise reduction tire may include a wear indicator which is combined with a bottom surface of the groove and formed to protrude from the bottom surface of the groove.

[0023] In an embodiment of the present invention, the wear indicator may include: a support groove formed in a flat groove at a bottom surface of the groove, and an identification protrusion protrudingly formed at an upper portion of the support groove and combined with at least a portion of the groove.

[0024] In an embodiment of the present invention, the protrusions include: a plurality of first protrusions protruding from the bottom surface and the wall surface of the groove, and a plurality of second protrusions protruding from the bottom surface and the wall surface of the groove.

[0025] In an embodiment of the present invention, a cross-sectional area of ​​the second protrusion in a direction perpendicular to the ground may be 0% to 90% of a cross-sectional area of ​​the first protrusion in a direction perpendicular to the ground.

[0026] In an embodiment of the present invention, it may be configured such that one pitch is formed by including more than one first protrusion and more than one second protrusion, and it may be configured such that a plurality of pitches are repeatedly formed.

[0027] In an embodiment of the present invention, in the pitch, a first group consisting of one or more first protrusions and a second group consisting of one or more second protrusions are formed to intersect with each other.

[0028] In an embodiment of the present invention, a plurality of protrusions may be arranged parallel to each other.

[0029] In an embodiment of the present invention, when the angle when extending in parallel with the circumferential direction of the tire is defined as 0 degree, the plurality of protrusions may be extended to have an angle of not less than 0 degree and not more than 360 degrees.

[0030] In an embodiment of the present invention, when the plurality of protrusions extend in a direction not parallel to the circumferential direction of the tire, the heights of the two ends of the plurality of protrusions decrease as they approach the upper end of the wall of the groove, so that the height at the uppermost end of the groove can be converged to 0 to 2 mm.

[0031] In an embodiment of the present invention, both ends of the plurality of protrusions may refer to positions from the upper end of the groove to 10% to 50% of the entire depth of the groove.

[0032] In an embodiment of the present invention, the height of the first protrusion may be 0.1 mm to 2 mm, and the area of ​​the first protrusion may be 0.1 mm to 2 mm. 2 Up to 2mm 2The height of the second protrusion may be 0.09 mm to 1.8 mm, and the area of ​​the second protrusion may be 0.09 mm 2 Up to 1.8mm 2 .

[0033] In an embodiment of the present invention, a distance between the first protrusion and the second protrusion may be 0.05 mm to 4 mm.

[0034] In an embodiment of the present invention, a plurality of the protrusions may be arranged at a prescribed interval from each other, and may be formed over the entire area of ​​the groove.

[0035] In an embodiment of the present invention, the cross-sectional shape of the protrusion may be circular or polygonal.

[0036] In an embodiment of the present invention, the protrusion may be arranged to have a prescribed height along a length direction of the groove.

[0037] In an embodiment of the present invention, the protrusion may extend along the length direction of the groove and extend in a straight line or a curved line.

[0038] Effects of the Invention

[0039] The effect of the present invention according to the above structure is that a larger surface area can be ensured by applying the protrusions in the form of fine protrusions to the wall surface and the bottom surface of the groove as a whole. And, as described above, the protrusions formed on the entire exposed surface of the groove have the advantage of being able to dissipate noise energy by generating a large amount of thermal friction energy.

[0040] In addition, the present invention has the following advantages in that the first protrusions and the second protrusions formed in the grooves can be formed in different sizes and cross-formed, thereby dispersing and canceling the resonance sound and improving the noise reduction efficiency.

[0041] In addition, the present invention has the advantage of preventing the surface layer from becoming rough due to the inability of moisture to escape during mold casting by forming a fluid flow path.

[0042] In addition, the present invention has the following advantages: the degree of wear of the tire can be confirmed by forming the wear indicator.

[0043] In addition, the present invention has an effect of having an advantage of measuring an accurate height of the wear indicator by forming the wear indicator on a flat surface.

[0044] The effects of the present invention are not limited to the above-mentioned effects, and should be understood to include all effects that can be derived from the configurations of the invention described in the detailed description of the present invention or the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a perspective view of a noise reduction tire according to a second embodiment of the present invention.

[0046] Figure 2 is a front view of a noise reduction tire according to a second embodiment of the present invention.

[0047] Figure 3 It is a cross-sectional view and an enlarged view of a noise reduction tire according to a second embodiment of the present invention as viewed from the side.

[0048] Figure 4 yes Figure 3 BB' cross-sectional view.

[0049] Figure 5A and Figure 5B is a plan view showing a wear indicator according to a second embodiment of the present invention.

[0050] Figure 6 It is a diagram showing gas slag.

[0051] Figure 7 is a perspective view of a noise reduction tire according to a first embodiment of the present invention.

[0052] Figure 8 is a front view of a noise reduction tire according to a first embodiment of the present invention.

[0053] Fig. 9 This is a cross-sectional view of a noise reduction tire according to a first embodiment of the present invention as viewed from the side.

[0054] Fig.10 yes Fig. 9 A-A' cross-sectional view.

[0055] Fig.11A and Fig. 11B is a plan view showing a wear indicator according to a first embodiment of the present invention.

[0056] Description of Reference Numerals

[0057] 100, 200: noise reduction tire; 110, 210: block; 120, 220: groove; 130, 230: first protrusion; 140, 240: second protrusion; 150, 250: fluid flow path; 151, 251: gas residue; 160, 260: wear indicator; 161, 261: support groove; 162, 262: identification protrusion. DETAILED DESCRIPTION

[0058] The present invention will be described below with reference to the accompanying drawings. However, the present invention can be implemented in various forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention in the accompanying drawings, parts not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

[0059] Throughout the specification, when a part is "connected (connected, in contact with, combined)" with other parts, it includes not only the case of "direct connection" but also the case of "indirect connection" with other parts in between. In addition, when a part "includes" a certain constituent element, it means that it may also have other constituent elements rather than excluding other constituent elements, unless otherwise specifically stated to the contrary.

[0060] The terms used in this specification are only used to illustrate specific embodiments and are not intended to limit the present invention. Singular expressions also include plural expressions unless the context clearly stipulates otherwise. In this specification, it should be understood that terms such as "including" or "having" are intended to specify the existence of features, numbers, steps, actions, constituent elements, parts or combinations thereof described in the specification, but do not exclude in advance the possibility of the existence or addition of one or more other features or numbers, steps, actions, constituent elements, parts or combinations thereof.

[0061] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0062] Figure 1 is a perspective view of a noise reduction tire according to a second embodiment of the present invention. Figure 2 is a front view of a noise reduction tire according to a second embodiment of the present invention. Figure 3 It is a cross-sectional view and an enlarged view of a noise reduction tire according to a second embodiment of the present invention as viewed from the side. Figure 4 yes Figure 3 BB' cross-sectional view.

[0063] Figure 5A and Figure 5B is a plan view showing a wear indicator according to a second embodiment of the present invention. Figure 6 It is a diagram showing gas slag.

[0064] like Figure 1 As shown, the noise reduction tire 200 according to the second embodiment of the present invention may include: blocks 210, grooves 220, protrusions, fluid flow paths 250, wear indicators 260, and gas residues 251. The blocks 210 may be provided to be formed in plurality on the tire tread and form a portion in contact with the ground.

[0065] The groove 220 may be formed between the blocks 210 and form a main groove extending in the circumferential direction of the tire. The groove 220 may include: a side wall surface that is inclined in a direction from the upper part to the lower part and formed in a straight manner; a bottom surface that is combined with the side wall surface and formed in a straight line parallel to the ground; the other side wall surface that is combined with the bottom surface and formed flat in a manner symmetrical to the side wall surface; a side joint surface that is combined with the side wall surface and the bottom surface and formed as a curved portion; and the other side joint surface that is combined with the other side wall surface and the bottom surface and formed as a curved portion.

[0066] The protrusion may include: a bottom protrusion formed to protrude from the bottom of the groove 220 and extend along the groove 220; a wall protrusion formed to protrude from the wall of the groove and extend along the groove; and a combination protrusion combined with one side combination surface and the other side combination surface to form a curved portion. The wall protrusion may be as follows: Figure 2 As shown in FIG. 1 , the length of the bottom protrusion in the direction perpendicular to the length direction of the groove 220 can be as follows: Figure 5B Shown is the length e.

[0067] Such a protrusion may be formed to protrude on the bottom and wall of the groove 220 and extend along the groove, and may include a plurality of protrusions having different heights from each other. The protrusions are arranged to include more than one protrusion of various types classified according to height and form a pitch to increase the thermal friction energy generated by the flow to reduce the noise energy.

[0068] The protrusions constituting the protrusion portion will be described below by way of specific embodiments. However, the number of protrusions included in the protrusion portion is not limited to two. In the following, for ease of description, the number of protrusions is represented as two, but the number of protrusions having different heights from each other is not limited to two, and may be more than two.

[0069] The protrusion may include a first protrusion 230 and a second protrusion 240. The first protrusion 230 may be formed protrudingly on the bottom surface and the wall surface of the groove 220 and formed in plurality, and the second protrusion 240 may be formed protrudingly on the bottom surface and the wall surface of the groove.

[0070] At this time, the protrusion height of the first protrusion 230 may be characterized as being higher than the protrusion height of the second protrusion 240. More specifically, the cross-sectional area of ​​the second protrusion 240 in the direction perpendicular to the ground may be 0% to 90% of the cross-sectional area of ​​the first protrusion 230 in the direction perpendicular to the ground.

[0071] For example, the height of the first protrusion 230 may be 0.1 mm to 2 mm, and the height of the second protrusion 240 may be 0.09 mm to 1.8 mm. However, the protrusion height of the first protrusion 230 may be the same as the protrusion height of the second protrusion 240. In addition, the area of ​​the first protrusion 230 may be 0.1 mm 2 Up to 2mm 2 The area of ​​the second protrusion 240 can be 0.09 mm 2 Up to 1.8mm 2 .

[0072] Also, the first protrusion 230 and the second protrusion 240 may be formed to extend in parallel with each other, and the first protrusion 230 and the second protrusion 240 may be formed to be spaced apart from each other by a predetermined interval.

[0073] For example, the interval between the first protrusion 230 and the second protrusion 240 may be 0.05 mm to 4 mm. The first protrusion 230 and the second protrusion 240 may be formed at a predetermined interval in the entire area of ​​the groove 220 .

[0074] More specifically, one pitch is formed by including more than one first protrusion 230 and more than one second protrusion 240 , and the pitch may be repeatedly formed in the entire area of ​​the groove 220 .

[0075] For example, the pitch may be configured to include one first protrusion 230 and one second protrusion 240 , and a plurality of pitches may be repeatedly formed at a predetermined interval.

[0076] In addition, the pitch may be formed in the order of the first protrusion 230 , the second protrusion 240 , the second protrusion 240 , and the first protrusion 230 , and the pitch set in this manner may be repeatedly formed at a prescribed interval.

[0077] In addition, the pitch may be set so that a first group consisting of one or more first protrusions 230 and a second group consisting of one or more second protrusions 240 intersect each other.

[0078] For example, the pitch may be composed of three first protrusions 230 and two second protrusions 240. Also, the pitch composed of the first group and the second group may be arranged in the order of first protrusion 230, first protrusion 230, first protrusion 230, second protrusion 240, and second protrusion 240, so that the pitch can be repeatedly formed in the entire region of the groove 220.

[0079] As described above, in the present invention, the pitch formed by the combination of the first protrusion 230 and the second protrusion 240 may be set to be repeatedly formed at a prescribed interval over the entire area of ​​the groove 220 .

[0080] The first protrusion 230 and the second protrusion 240 according to the second embodiment may be formed to extend at an angle parallel to the circumferential direction of the tire.

[0081] That is, each of the first protrusion 230 and the second protrusion 240 is formed on the bottom surface and the wall surface of the groove 220 , and may be extended along the extending direction of the groove 220 .

[0082] As described above, when the angle when extending parallel to the circumferential direction of the tire is defined as 0 degree, the first protrusion 130, 230 and the second protrusion 140, 240 according to the first and second embodiments may be extended to have an angle of 0 degree or more and 360 degrees or less.

[0083] The cross-sectional shape of the protrusion may be circular or polygonal. The protrusion may be arranged to have a specified height or a variable height along the length direction of the groove 220. For example, along the length direction of the groove 220, the protrusion may extend and have a specified height, a gradually increasing height, a gradually decreasing height, or an increasing and decreasing height.

[0084] The protrusion extends along the length direction of the groove, and may also extend in a straight line or a curved line.

[0085] The present invention thus configured can ensure a larger surface area by integrally applying the first protrusion 230 and the second protrusion 240 in the form of fine protrusions to the wall surface and the bottom surface of the groove 220. Also, as described above, the protrusions formed on the entire exposed surface of the groove 220 can generate a large amount of thermal friction energy to dissipate noise energy and reduce air column resonance sound.

[0086] In addition, if Figure 4 As shown, the first protrusion 230 and the second protrusion 230 formed in the groove 220 can be formed in different sizes and cross-formed, so that the resonance sound can be dispersed and offset and the noise reduction efficiency can be greatly improved.

[0087] like Figure 3 As shown, the wall protrusion portion can be separated into multiple parts by the fluid flow path 250, and the cross-sectional shape of the protrusion included in the wall protrusion portion in the length direction of the groove can be trapezoidal, and the angle of the trapezoid can be 65° to 85°, preferably 90°.

[0088] like Figures 2 to 3As shown in the figure, the noise reduction tire may include a fluid flow path 250, which is formed along the wall surface of the groove 220 and provides a flow path for the air in the groove 220. The fluid flow path 250 can be formed on the wall protrusions formed on the two side walls of a flat shape without a curved portion. The length of a fluid flow path along the wall direction can be the same as the length of the wall protrusion.

[0089] As another embodiment, the fluid flow path 250 can be formed on a flat wall protrusion portion and a combined protrusion portion having a curved portion. Therefore, the fluid flow path can be formed on all portions of the groove 220 except the bottom surface of the groove, so that fluid droplets trapped in the protrusion portion can be easily removed.

[0090] The fluid flow path 250 may be formed at a predetermined angle relative to the length direction of the wall protrusion, may be formed along the wall of the groove 220, and may cross the protrusion to divide the protrusion so that the fluid located in the protrusion can move. That is, the fluid flow path 250 may be formed in a groove-shaped path shape passing through a plurality of wall protrusions, and the fluid flow path 250 may separate the protrusions formed on the wall surfaces on both sides of the groove 220 into a plurality of protrusions.

[0091] like Figure 3 As shown, a plurality of fluid flow paths 250 may be formed on one block 210, and the length of the fluid flow path along the groove length direction as the distance between one protrusion and another protrusion in the protrusion portion of the wall formed adjacent to the fluid flow path 250 may be a, and the length a between the fluid flow paths may be 0.03 mm to 5 mm. The length of the protrusion included in the protrusion portion of the wall adjacent to the fluid flow path along the groove length direction may be 3 mm to 20 mm.

[0092] Conventionally, when cores are made for tire mold casting, the core, which is a mixture of gypsum and water, is hardened, but the water cannot escape, which may cause the surface layer to become rough.

[0093] Unlike the prior art, in the present invention, the fluid flow path 250 is formed in a direction not parallel to the length direction of the groove 220, so that the fluid droplets sandwiched between the protrusions of the protrusions are discharged along the flow path of the fluid flow path 250, and the water mixed in the core when the core is made can be discharged through the fluid flow path 250, which can prevent the surface layer of the core from becoming rough, so that when the tire 200 using the core is made, a tire 200 with a smooth surface can be formed. In addition, the fluid droplets sandwiched between the protrusions can be discharged through the fluid flow path, which can improve the waterproof performance of the tire 200.

[0094] Figure 5Ais a plan view of the wear indicator 260, Figure 5B 2 is a diagram showing the length of the support groove 261 in a direction perpendicular to the length direction of the groove 220 .

[0095] like Figure 1 and Figure 5A and Figure 5B As shown, the noise reduction tire 200 may include a wear indicator 260 formed protruding from the bottom surface of the groove 220. The wear indicator 260 may include: a support groove 261 formed in a flat groove at the bottom surface of the groove 220; and an identification protrusion 262 formed protruding from the upper portion of the support groove 261 and combined with at least a portion of the groove 220. Therefore, the wear indicator 260 may be formed to visually confirm the degree of tire wear.

[0096] like Figure 5B As shown, the support groove 261 can be formed as a flat groove in the bottom protruding part of the groove 220, and the length of the support groove 261 in the direction perpendicular to the length direction of the groove can be the same as the length of the bottom protruding part formed parallel to the bottom protruding part without a bending part, both of which are length e.

[0097] The length A between one side edge of the support groove 261 and the lower edge of one side of the identification protrusion 262 in the length direction of the groove 220 can be 3mm to 15mm, and the length A between the other side edge of the support groove 261 and the lower edge of the other side of the identification protrusion 262 in the length direction of the groove can be 3mm to 15mm.

[0098] In the past, when the peripheral portion of the wear indicator 260 was formed of uneven protrusions, there was a problem that the height of the wear indicator 260 could not be accurately measured. Therefore, the present invention forms a flat support groove 261 without the adjacent portion element of the identification protrusion 262, so that the height of the identification protrusion 262 can be accurately measured.

[0099] The identification protrusion 262 may be formed to protrude from the support groove 261, and both side surfaces of the identification protrusion 262 in a direction perpendicular to the length direction of the groove 220 may be combined with the protrusion. Therefore, the lower surface of the identification protrusion 262 is combined with the support groove 261, and the two side surfaces are combined with the protrusion to prevent the identification protrusion 262 from being cracked or damaged when a strong impact such as a sharp turn is applied. The cross-sectional shape of the identification protrusion 262 in the length direction of the groove may be any one selected from a trapezoid, a rectangle, a semicircle, and a semi-ellipse.

[0100] like Figure 6As shown, the noise reduction tire 200 may include gas residue 251 irregularly formed in a groove shape on a protrusion formed in a groove. The gas residue 251 is formed in a groove shape on the groove 220 or the protrusion, which can further reduce noise, and the gas residue 251 formed in a groove shape can improve the waterproof performance of the tire 200 by forming an empty space on the tire surface even when the tire is worn.

[0101] Figure 7 is a perspective view of a noise reduction tire according to a first embodiment of the present invention. Figure 8 is a front view of a noise reduction tire according to a first embodiment of the present invention. Fig. 9 This is a cross-sectional view of a noise reduction tire according to a first embodiment of the present invention as viewed from the side. Fig.10 yes Fig. 9 A-A' cross-sectional view. Fig.11A and Fig. 11B is a plan view showing a wear indicator according to a first embodiment of the present invention.

[0102] like Figures 7 to 11B As shown, the noise reduction tire 100 according to the first embodiment of the present invention may include: a block 110, a groove 120, a plurality of protrusions, a fluid flow path 150, a wear indicator 160, and gas residue 151. The block 110 may be provided to be formed in plurality on the tire tread and to form a portion in contact with the ground.

[0103] The groove 120 is formed between the blocks 110 and forms a main groove extending in the circumferential direction of the tire. The groove 120 may include: a side wall surface that is inclined in a direction from the upper part to the lower part and formed in a straight manner; a bottom surface that is combined with the side wall surface and formed in a straight line parallel to the ground; the other side wall surface that is combined with the bottom surface and formed flat in a manner symmetrical to the side wall surface; a side joint surface that is combined with the side wall surface and the bottom surface and formed as a curved portion; and the other side joint surface that is combined with the other side wall surface and the bottom surface and formed as a curved portion.

[0104] The protrusion may include: a bottom protrusion portion, which is formed to protrude on the bottom surface of the groove and extend along the groove; a wall protrusion portion, which is formed to protrude on one side wall and the other side wall of the groove and extend along the groove; and a combining protrusion portion, which is combined with one side combining surface and the other side combining surface and formed into a curved portion.

[0105] Such a protrusion may be formed to protrude on the bottom surface and the wall surface of the groove and extend along the groove, and may include a plurality of protrusions having different heights from each other. The protrusion is arranged to include more than one protrusion of various types classified according to height and form a pitch to increase the thermal friction energy generated by the flow to reduce the noise energy.

[0106] Hereinafter, the plurality of protrusions constituting the protrusion portion will be described through specific embodiments. However, the number of protrusions included in the protrusion portion is not limited to two. In the following, for the sake of convenience, the number of protrusions is expressed as two, but the number of protrusions having different heights from each other is not limited to two, and may be more than two.

[0107] The protrusion may include a first protrusion 130 and a second protrusion 140 .

[0108] The first protrusion 130 may be formed to protrude from the bottom surface and the wall surface of the groove 120 and may be formed in plurality.

[0109] The second protrusion 140 may be formed to protrude from the bottom surface and the wall surface of the groove.

[0110] At this time, the protrusion height of the first protrusion 130 may be characterized as being higher than the protrusion height of the second protrusion 140. More specifically, the height of the second protrusion 140 from the bottom may be 0% to 90% of the height of the first protrusion 130 from the bottom.

[0111] For example, the height of the first protrusion 130 may be 0.1 mm to 2 mm, and the height of the second protrusion 140 may be 0.09 mm to 1.8 mm.

[0112] However, the protrusion height of the first protrusion 130 may also be the same as the protrusion height of the second protrusion 140 .

[0113] Also, the first protrusion 130 and the second protrusion 140 may be formed to extend in parallel with each other, and the first protrusion 130 and the second protrusion 140 may be formed to be spaced apart from each other by a predetermined interval.

[0114] For example, the interval between the first protrusion and the second protrusion may be 0.05 mm to 4 mm.

[0115] The first protrusions 130 and the second protrusions 140 provided in this manner may be provided to be formed at a predetermined interval over the entire region of the groove 220 .

[0116] More specifically, one pitch is formed by including more than one first protrusion 130 and more than one second protrusion 140 , and the pitch may be repeatedly formed in the entire area of ​​the groove 120 .

[0117] For example, the pitch may be configured to include one first protrusion 130 and one second protrusion 140 , and a plurality of pitches may be repeatedly formed at a predetermined interval.

[0118] In addition, the pitch may be formed in the order of the first protrusion 130 , the second protrusion 140 , the second protrusion 140 , and the first protrusion 130 , and the pitch set in this manner may be repeatedly formed at a prescribed interval.

[0119] In addition, the pitch may be set so that a first group consisting of one or more first protrusions 130 and a second group consisting of one or more second protrusions 140 intersect each other.

[0120] For example, the pitch may be composed of three first protrusions 130 and two second protrusions 140. Furthermore, the pitch composed of the first group and the second group may be arranged in the order of the first protrusion 130, the first protrusion 130, the first protrusion 130, the second protrusion 140, and the second protrusion 140, so that the pitch can be repeatedly formed in the entire area of ​​the groove 120.

[0121] As described above, in the present invention, the pitch formed by the combination of the first protrusion 130 and the second protrusion 140 may be set to be repeatedly formed at a prescribed interval over the entire area of ​​the groove 120 .

[0122] The first protrusion 130 and the second protrusion 140 according to the first embodiment may be formed to extend at an angle that is not parallel to the circumferential direction of the tire.

[0123] That is, each of the first protrusion 130 and the second protrusion 140 may be formed to extend in an oblique line from an upper end of one side wall surface of the groove 120 to a bottom surface of the groove 120 and an upper end of another side wall surface of the groove 120 .

[0124] When the first protrusion 130 and the second protrusion 140 extend in a direction not parallel to the circumferential direction of the tire, Figure 8 As shown, the two ends a of the first protrusion 130 and the second protrusion 140 can be arranged to decrease in height toward the upper end of the wall surface of the groove 120, so that the height can be converged to 0-2 mm at the uppermost end of the groove 120. Specifically, when the height of the two ends a of the first protrusion 130 and the second protrusion 140 at the uppermost end of the groove 120 exceeds 2 mm, the wet driving performance may be reduced, so it is preferably limited to less than 2 mm. However, the present invention does not completely exclude the situation where the height of the two ends a of the first protrusion 130 and the second protrusion 140 at the uppermost end of the groove 120 exceeds 2 mm, and it can be changed as needed.

[0125] At this time, both ends a of the first protrusion 130 and the second protrusion 140 may refer to portions corresponding to positions from the upper end of the groove 120 to 10% to 50% of the entire depth of the groove 120 .

[0126] The cross-sectional shape of the protrusion may be circular or polygonal.

[0127] The protrusions may be arranged to have a specified height or a varying height along the length direction of the groove 120. For example, along the length direction of the groove 120, the protrusions may extend and have a specified height, a gradually increasing height, a gradually decreasing height, or an increasing and decreasing height.

[0128] The protrusion extends along the length direction of the groove, and may also extend in a straight line or a curved line.

[0129] The present invention thus configured can ensure a larger surface area by integrally applying the first protrusion 130 and the second protrusion 140 in the form of fine protrusions to the wall surface and the bottom surface of the groove 120. Also, as described above, the protrusions formed on the entire exposed surface of the groove 120 can dissipate noise energy and reduce air column resonance sound by generating a large amount of thermal friction energy.

[0130] In addition, if Fig.10 As shown, the first protrusion 130 and the second protrusion 130 formed in the groove 120 can be formed in different sizes and cross-formed, so that the resonance sound can be dispersed and offset and the noise reduction efficiency can be greatly improved.

[0131] like Figures 7 and 8 As shown, the noise reduction tire 100 may include a fluid flow path 150 formed along the wall surface of the groove 120 and providing a flow path for the air in the groove 120, and the fluid flow path 150 may be formed by a path formed by a spacing space between one protrusion and another protrusion. As an embodiment, among the first protrusions 130 and the second protrusions 140 formed on one side wall surface and the other side wall surface portion of the groove 120, the first protrusions 130 and the second protrusions 140 formed adjacent to each other may be referred to as the fluid flow path 150.

[0132] Conventionally, when cores are made for tire mold casting, the core, which is a mixture of gypsum and water, is hardened, but the water cannot escape, which may cause the surface layer to become rough.

[0133] Unlike the prior art, in the present invention, since the water mixed in the core when the core is manufactured can be discharged through the fluid flow path 150, the surface layer of the core can be prevented from becoming rough, so that when the core is used to manufacture a tire, a smooth surface tire 100 can be formed. In addition, since the protrusions are formed to extend along the oblique line, the fluid droplets sandwiched between the protrusions can be discharged through the fluid flow path 150 between one protrusion and another protrusion, thereby improving the waterproof performance of the tire.

[0134] Fig.11A is a plan view of the wear indicator 160, Fig. 11B 1 is a diagram showing the length of the support groove 161 in a direction perpendicular to the length direction of the groove 120 .

[0135] like Figure 7 and Fig.11A and Fig. 11B As shown, the noise reduction tire 100 may include a wear indicator 160 formed to protrude from the bottom surface of the groove 120. The wear indicator 160 may include: a support groove 161 formed in a flat groove at the bottom surface of the groove 220; and an identification protrusion 162 formed to protrude from the upper part of the support groove 161 and combined with at least a part of the groove 120. Therefore, the wear indicator 160 may be formed to visually confirm the degree of tire wear.

[0136] like Fig. 11B As shown, the support groove 161 can be formed as a flat groove in the bottom protruding part of the groove 120, and the length of the support groove 161 in the direction perpendicular to the length direction of the groove can be the same as the length of the bottom protruding part formed parallel to the bottom protruding part without a bending part, both of which are length e.

[0137] The length A between one side edge of the support groove 161 and the lower edge of one side of the identification protrusion 162 in the length direction of the groove 120 can be 3mm to 15mm, and the length A between the other side edge of the support groove 161 and the lower edge of the other side of the identification protrusion 162 in the length direction of the groove can be 3mm to 15mm.

[0138] In the past, when the peripheral portion of the wear indicator 160 was formed of uneven protrusions, there was a problem that the height of the wear indicator 160 could not be accurately measured. Therefore, the present invention forms a flat support groove 161 without the adjacent element of the identification protrusion 162, so that the height of the identification protrusion 162 can be accurately measured.

[0139] The identification protrusion 162 may be formed to protrude from the support groove 161, and both side surfaces of the identification protrusion 162 in a direction perpendicular to the length direction of the groove 120 may be combined with the protrusion. Therefore, the lower surface of the identification protrusion 162 is combined with the support groove 161, and the two side surfaces are combined with the protrusion to prevent the identification protrusion 162 from being cracked or damaged when a strong impact such as a sharp turn is applied. The cross-sectional shape of the identification protrusion 162 in the length direction of the groove may be any one selected from a trapezoid, a rectangle, a semicircle, and a semi-ellipse.

[0140] like Figure 6As shown, the noise reduction tire 100 may include gas residue 151 irregularly formed in a groove shape on a protrusion formed in the groove 120. The gas residue 151 is formed in a groove shape on the groove 120 or the protrusion, which can further reduce noise, and the gas residue 151 formed in a groove shape can improve the waterproof performance of the tire 100 by forming an empty space on the tire surface even when the tire is worn.

[0141] The above description of the present invention is for illustrative purposes, and those skilled in the art of the present invention will appreciate that it can be easily transformed into other specific forms without changing the technical ideas or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, constituent elements described as single types may also be implemented in a dispersed manner, and similarly, constituent elements described as dispersed may also be implemented in a combined form.

[0142] The scope of the present invention is indicated by the appended claims, and it should be interpreted that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

Claims

1. A noise reduction tire, characterized in that: include: A plurality of blocks are formed on the tread. a groove formed between the blocks and formed to extend in a circumferential direction of the tire, and a protrusion portion including a plurality of protrusions formed to protrude from a bottom surface and a wall surface of the groove and extend along the groove; The plurality of protrusions generate thermal friction energy to reduce noise energy.

2. The noise reduction tire according to claim 1, characterized in that: Also includes: A fluid flow path is formed along the wall surface of the groove, crosses the protrusion to divide the protrusion, and moves the fluid located in the protrusion.

3. The noise reduction tire according to claim 2, characterized in that: The width of the fluid flow path is 0.03 mm to 5 mm.

4. The noise reduction tire according to any one of claims 1 to 3, characterized in that: Also includes: Gas slag is formed in the groove shape in the recess.

5. The noise reduction tire according to any one of claims 1 to 3, characterized in that: Also includes: A wear indicator is combined with the bottom surface of the groove and is formed to protrude from the bottom surface of the groove.

6. The noise reduction tire according to claim 5, characterized in that: The wear indicator comprises: a supporting groove formed as a flat plate-shaped groove on the bottom surface of the groove, and An identification protrusion is formed to protrude from an upper portion of the support groove and is combined with at least a portion of the groove.

7. The noise reduction tire according to any one of claims 1 to 3, characterized in that: The protrusion comprises: a plurality of first protrusions protrudingly formed on the bottom surface and the wall surface of the groove, and A plurality of second protrusions are formed protrudingly on the bottom surface and the wall surface of the groove.

8. The noise reduction tire according to claim 7, characterized in that: A height of the second protrusion from the bottom surface is 0% to 90% of a height of the first protrusion from the bottom surface.

9. The noise reduction tire according to claim 8, characterized in that: One or more of the first protrusions and one or more of the second protrusions form a pitch, A plurality of pitches are arranged in a repetitive manner.

10. The noise reduction tire according to claim 9, characterized in that: In the pitch, a first group consisting of one or more first protrusions and a second group consisting of one or more second protrusions are formed to intersect with each other.

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