Tyre comprising pairs of transverse cuts for sound dispersion

Abstract

The present invention relates to a tire (10) comprising a transverse cutout (80, 90) formed in an axial side portion (P1, P2). The transverse cutouts (80, 90) provided in each axial side portion (P1, P2) comprise at least one acoustic scattering pair of first and second transverse cutouts (801, 802, 811, 812). Each axially inner portion (861, 862, 871, 872) of each of the first and second transverse cutouts (801, 802, 811, 812) of the acoustic dispersion pair extends in a general direction forming a first non-zero average angle with the axial direction (Y), said first non-zero average angle being different from a second non-zero average angle (F1, F2, F11, F12) formed with the axial direction (Y).

Description

Technical Field

[0001] The present invention relates to a tire for passenger vehicles. A tire is understood to be a casing intended to form, by cooperating with a supporting element, such as a rim, a cavity capable of being pressurized to a pressure higher than atmospheric pressure. The tire according to the invention has a structure that presents a generally toroidal shape that is rotationally symmetrical about the main axis of the tire. Background Art

[0002] A tire for passenger vehicles is known in the prior art. Sold under the trade name PRIMACY This type of tire comprises a tread intended to come into contact with the ground via the tread surface when the tire is running.

[0003] The tread includes a main circumferential incision, the depth of which is greater than or equal to 50% of the tread pattern height and includes a first axially outer main circumferential incision and a second axially outer main circumferential incision axially located on both sides of the tire midplane. The first axially outer main circumferential incision and the second axially outer main circumferential incision are the axially outermost main circumferential incisions of the tread.

[0004] The tread includes a first axial side portion axially outside the first axially outer main circumferential cutout and a second axial side portion axially outside the second axially outer main circumferential cutout. The tread also includes transverse cutouts partially formed in the first axial side portion and the second axial side portion, respectively.

[0005] Due to increasingly strict regulations on the external noise generated by tires, the external noise generated by tires of the prior art must be reduced as much as possible not only under normal use conditions, but also under use conditions far from normal use conditions. Use conditions are understood to refer primarily to conditions related to speed, pressure and load of the tire, but also to the width of the rim on which the tire is mounted.

[0006] The object of the present invention is therefore to reduce the external noise generated by a tyre by reducing the noise generated by the transverse cuts formed in the first and second axial side portions under a very wide range of conditions of use. Summary of the invention

[0007] To this end, the invention relates to a tire for passenger vehicles, said tire comprising a tread intended to come into contact with the ground via a tread surface when the tire is running, said tread comprising:

[0008] - main circumferential incisions, the depth of which is greater than or equal to 50% of the tread pattern height and comprising a first axially outer main circumferential incision and a second axially outer main circumferential incision arranged axially on both sides of the tire midplane, the first axially outer main circumferential incision and the second axially outer main circumferential incision being the axially outermost main circumferential incisions of the tread,

[0009] a first axial side portion arranged axially on the outside of the first axially outer main circumferential cutout and extending axially from a first axial edge of the tread surface to an axially outer edge of the first axially outer main circumferential cutout,

[0010] a second axial side portion arranged axially on the outside of the second axially outer main circumferential cutout and extending axially from the second axial edge of the tread surface to the axially outer edge of the second axially outer main circumferential cutout,

[0011] the tread comprising at least a transverse cutout formed at least partially in at least one of a first axial side portion and a second axial side portion,

[0012] At least one of the first axial side portion and the second axial side portion includes an axial portion having an axial width equal to 50% of the axial width of at least one of the first axial side portion and the second axial side portion and extending axially outward from an axially outer edge of the first axially outer main circumferential cutout or the second axially outer main circumferential cutout, and at least one of the first axial side portion and the second axial side portion extends from an axially outer edge of the first axially outer main circumferential cutout or the second axially outer main circumferential cutout,

[0013] Each transverse cutout comprises an axially inner portion extending in an axial portion of at least one of the first axial side portion and the second axial side portion,

[0014] The transverse cuts formed in at least one of the first axial side portion and the second axial side portion include at least one diffuse pair, the diffuse pair including a first transverse cut and a second transverse cut, each axial inner portion of each of the first transverse cut and the second transverse cut of the diffuse pair having a width La1, La2, respectively, satisfying:

[0015] -1≤La1 / La2≤2.5, where La1>1.5mm and La2>1.5mm,

[0016] -1≤La1 / La2≤3.0, where La1>1.5mm and La2≤1.5mm,

[0017] -1≤La1 / La2≤4.0, where La1≤1.5mm,

[0018] each axially inner portion of each of the first and second transverse cutouts of the or each diffuse pair extends in a general direction forming a first non-zero average angle and a second non-zero average angle, respectively, with the axial direction,

[0019] The first average angle of the axially inner portion of the first transverse cutout of the or each diffuse acoustic pair is different from the second average angle of the axially inner portion of the second transverse cutout of the diffuse acoustic pair.

[0020] The invention enables to reduce the exterior noise generated by the transverse cuts formed in at least one of the first and second axial side portions under very wide use conditions. In other words, the tire according to the invention has considerable functionality in terms of exterior noise performance.

[0021] In particular, the inventors of the present invention have discovered that the external noise generated by a transverse cut is greater when the edge of the transverse cut coincides with the edge of the tire contact patch.

[0022] The shape of the contact patch and its edges depends on the conditions of use. Thus, under certain conditions of use, the transverse cuts of a given tire can coincide with the edges of the tire contact patch to a considerable extent, generating relatively high external noise, while under other conditions of use, the transverse cuts of the same tire can coincide with the edges of the tire contact patch to a small extent or not at all, generating relatively low external noise. Providing transverse cuts with different average angles in the axial portion can reduce the occurrence of coincidences between the corners of the transverse cuts and the edges of the tire contact patch, regardless of the conditions of use, and thus reduce the external noise generated by the tire.

[0023] This explains the sound-scattering function associated with the pairs of transverse cutouts and their sections, which are able to disperse the noise generated by the transverse cutouts under a very wide range of usage conditions.

[0024] According to the following features: each axial inner portion of the first transverse cutout and the second transverse cutout of the sound-scattering pair has a width La1, La2, respectively, satisfying:

[0025] -1≤La1 / La2≤2.5, where La1>1.5mm and La2>1.5mm,

[0026] -1≤La1 / La2≤3.0, where La1>1.5mm and La2≤1.5mm,

[0027] -1≤La1 / La2≤4.0, where La1≤1.5mm,

[0028] This allows transverse cuts of comparable length and therefore comparable performance to be considered, without the cut widths having to be strictly identical.

[0029] In variants, it is possible to envisage that the axially inner portion does not enter one of the first axially outer main circumferential cutout and the second axially outer main circumferential cutout adjacent thereto. In these variants, the transverse cutout is referred to as a blind cutout. In other variants, the axially inner portion enters one of the first axially outer main circumferential cutout and the second axially outer main circumferential cutout adjacent thereto. Thus, the mobility of the tread pattern is improved compared to the case with a transverse blind cutout, thereby improving the flattening of the tire and, therefore, the rolling resistance.

[0030] Typically, the tread surface is delimited axially by a first axial edge and a second axial edge. According to the 2021 European Tire and Rim Technical Organization (or "ETRTO") standard, the first axial edge and the second axial edge of the tread surface are determined on a tire mounted on a nominal rim and inflated to a nominal pressure. The first axial edge and the second axial edge of the tread surface are located on either side of the midplane of the tire and are formed by lines substantially parallel to the circumferential direction of the tire. If there is a clear boundary between the tread surface and the rest of the tire, the first axial edge and the second axial edge of the tread surface can be simply determined. If the tread surface is continuous with the outer surface of the tire sidewall, the first axial edge and the second axial edge are determined by considering the following: in each meridian section, the first axial edge and the second axial edge each pass through a point, and the angle between the tangent to the tread surface at this point and the straight line parallel to the axial direction and passing through this point is equal to 30°. When there are multiple points in the meridian section where the absolute value of the angle is equal to 30°, the radially outermost point is used.

[0031] The average angle of a segment is determined by taking a straight line between the two endpoints of the segment, which are located at the end of each segment and are equidistant from the leading and trailing edges of each end of the segment.

[0032] Of course, the transverse cuts (especially the first transverse cut, the second transverse cut and the optional third transverse cut for sound diffusion) are separated from each other. Therefore, the transverse cuts (especially the first transverse cut, the second transverse cut and the optional third transverse cut for sound diffusion) are offset from each other in the circumferential direction. Therefore, there is no direct axial communication between the transverse cuts (especially the first transverse cut, the second transverse cut and the optional third transverse cut for sound diffusion). Therefore, there is either no communication between the transverse cuts (especially the first transverse cut, the second transverse cut and the optional third transverse cut for sound diffusion), or if there is communication between them, it is achieved through non-transverse cuts (such as circumferential cuts). Therefore, the transverse cuts (especially the first transverse cut, the second transverse cut and the optional third transverse cut for sound diffusion) are not continuous with each other in the axial direction.

[0033] Of course, the first and second axial side portions of the tread, or each first axial side portion and each second axial side portion, may comprise other transverse cuts not having the characteristics of the transverse cuts according to the invention, in particular characteristics related to the width of their axially inner portion, as well as circumferential cuts having a depth strictly less than 50% of the height of the tread pattern.

[0034] The incision (or incision portion) has two main characteristic dimensions on the tread surface: width and curve length, satisfying that the curve length is at least equal to twice the width. Therefore, the incision (or incision portion) is defined by at least two main sides that determine its curve length and are connected by the bottom, and the distance between these two main sides is not zero, which is called the incision (or incision portion) width.

[0035] On a new tire, the width of a cut (or a portion of a cut) is the maximum distance between the two main side faces, measured by default at a radial point coinciding with the tread surface when the cut (or portion of a cut) has no chamfer, and by default at the radially outermost radial point of the cut (or portion of a cut) and the radially inner side of the chamfer when the cut (or portion of a cut) has a chamfer. The width is measured substantially perpendicular to the main side faces. If a width other than the default width is specified, such as a width at a specific point, the width is equal to the distance between the two main side faces at the specific point of the cut (or portion of a cut).

[0036] On a new tire, the depth of the cut (or cut portion) is the maximum radial distance between the bottom of the cut (or cut portion) and the projection of the bottom of the cut on the ground when the tire is running. The maximum value of the cut depth is called the tread height.

[0037] The cutouts (or cutout portions) may be transverse or circumferential.

[0038] A transverse incision is a incision extending in a general direction that forms an angle with the circumferential direction of the tire strictly greater than 30°, preferably greater than or equal to 45° (i.e. an angle with the axial direction of the tire less than or equal to 60°, preferably strictly less than 45°). The general direction is the shortest curve connecting the two ends of the incision and parallel to the tread surface. A transverse incision (or a portion of the incision) can be continuous, i.e. not interrupted by a tread block or another incision, so that the two main sides that determine its length are not interrupted over the length of the transverse incision (or portion of the incision). A transverse incision can also be discontinuous, i.e. interrupted by one or more tread blocks and / or one or more incisions, so that the two main sides that determine its length are interrupted by one or more tread blocks and / or one or more incisions.

[0039] A circumferential incision is understood to mean that the incision (or a portion of the incision) extends along a general direction that forms an angle less than or equal to 30°, preferably less than or equal to 10°, with the circumferential direction of the tire (i.e. an angle strictly greater than 60°, preferably strictly greater than 80°, with the axial direction of the tire). The general direction is the shortest curve connecting the two ends of the incision and parallel to the tread surface. In the case of a continuous circumferential incision, the two ends coincide with each other and are joined by a curve that completely surrounds the tire. A circumferential incision may be continuous, i.e. not interrupted by a tread block or another incision, such that the two main sides that determine its length completely surround the tire without interruption. A circumferential incision may also be discontinuous, i.e. interrupted by one or more tread blocks and / or one or more other incisions, such that the two main sides that determine its length are interrupted over the entire circumference of the tire by one or more tread blocks and / or one or more other incisions.

[0040] In the case of a transverse cut or transverse cut portion, the side faces are leading and trailing faces, and the leading and trailing faces are each provided with a leading edge and a trailing edge, respectively, the leading edge being the edge entering the contact patch before the trailing edge for a given circumferential line.

[0041] In an embodiment which optionally improves braking on dry ground, the or each transverse cut has a chamfer. The chamfer on the transverse cut may be a straight chamfer or a rounded chamfer. A straight chamfer is formed by a plane inclined relative to the leading or trailing face, which plane continues the leading or trailing face up to the leading or trailing edge which circumferentially delimits the transverse cut. A rounded chamfer is formed by a curved surface tangentially merging with the leading or trailing face, which continues the leading or trailing face. The chamfer on the transverse cut is characterized by a height and a width which are respectively equal to the radial distance and the distance in a direction perpendicular to the leading or trailing face between the common point of the leading or trailing face to which the chamfer continues and the leading or trailing edge which circumferentially delimits the transverse cut.

[0042] In certain embodiments that optionally improve braking on wet surfaces and lateral grip on dry surfaces, at least one main circumferential cut has a chamfer. The chamfer on the circumferential cut can be a straight chamfer or a rounded chamfer. The straight chamfer is formed by a plane inclined relative to the axially inner side and the axially outer side, and the plane continues the axially inner side and the axially outer side until the axially inner edge or the axially outer edge of the circumferential cut is axially bounded. The rounded chamfer is formed by a curved surface that is tangent to and merges with the axially inner side or the axially outer side, and the curved surface continues the axially inner side or the axially outer side. The chamfer on the circumferential cut is characterized in that the height and width are respectively equal to the radial distance and the axial distance between the common point of the axially inner side or the axially outer side to which the chamfer continues and the axially inner edge or the axially outer edge of the circumferential cut is axially bounded.

[0043] The tyre according to the invention has a generally toroidal shape about an axis of rotation substantially coinciding with the axis of rotation of the tyre. This axis of rotation defines three directions commonly used by those skilled in the art: axial, circumferential and radial.

[0044] The expression "axial direction" means a direction substantially parallel to the axis of rotation of the tyre, ie the axis of rotation of the tyre.

[0045] The expression “circumferential direction” means a direction substantially perpendicular simultaneously to the axial direction and to the radius of the tire (in other words tangential to a circle centred on the axis of rotation of the tire).

[0046] The expression “radial direction” means a direction along a radius of the tire, ie any direction intersecting the axis of rotation of the tire and being substantially perpendicular to this axis.

[0047] The median plane of the tire (denoted by M) is understood to be the plane perpendicular to the axis of rotation of the tire, situated axially centred between the two beads and passing through the axial middle of the crown reinforcement.

[0048] The expression "equatorial circumferential plane of the tire" (indicated by E) means a plane passing through the equator of the tire in meridian section and perpendicular to the median plane and to the radial direction. In meridian section (plane perpendicular to the circumferential direction and parallel to the radial and axial directions), the equator of the tire is the axis parallel to the axis of rotation of the tire and situated equidistantly between the radially outermost point of the tread intended to come into contact with the ground and the radially innermost point of the tire intended to come into contact with a support such as a rim, the distance between these two points being equal to H.

[0049] The expression “meridian plane” means a plane parallel to the axis of rotation of the tyre, containing this axis of rotation and perpendicular to the circumferential direction.

[0050] The expressions “radially inside / radially inboard” and “radially outside / radially outboard” mean, respectively, closer to and further away from the axis of rotation of the tire. The expressions “axially inside / axially inboard” and “axially outside / axially outboard” mean, respectively, closer to and further away from the mid-plane of the tire.

[0051] Bead is understood to be the portion of the tyre intended to attach the tyre to a mounting support, such as a wheel comprising a rim. Thus, each bead is particularly intended to be in contact with a flange of the rim so that it can be attached.

[0052] Any numerical range expressed by the expression "between a and b" represents a numerical range extending from greater than a to less than b (i.e., excluding the endpoints a and b), while any numerical range expressed by the expression "from a to b" means a numerical range extending from a to b (i.e., including the strict endpoints a and b).

[0053] In a preferred embodiment of the invention, the tire is intended for passenger vehicles as defined according to the European Tyre and Rim Technical Organization or "ETRTO" standard of 2021. Such a tire has a section in meridian section characterized in that, within the meaning of the European Tyre and Rim Technical Organization (or "ETRTO") standard of 2021, the section height H and the nominal section width S satisfy a ratio H / S expressed as a percentage at most equal to 90, preferably at most equal to 70 and at least equal to 30, and the nominal section width S is at least equal to 115 mm, preferably at least equal to 175 mm and at most equal to 385 mm, preferably at most equal to 315 mm. In addition, the diameter D at the rim flange defines the diameter of the mounting rim of the tire, which diameter D is at least equal to 12 inches, preferably at least equal to 16 inches and at most equal to 24 inches.

[0054] In a preferred embodiment of the invention, the tire is a "summer" tire. A summer tire is understood to be a tire that does not belong to the category of "four-season" or "all-season" tires or "winter" tires.

[0055] Winter tires are primarily identified by the M+S mark (M+S stands for "Mud + Snow") and / or the 3PMSF mark (3PMSF stands for "3 Peaks Mountain Snowflake"). All-season or all-season tires also have the M+S and / or 3PMSF mark due to their performance on snow. Summer tires, therefore, do not have the M+S mark or the 3PMSF mark.

[0056] The tread preferably but optionally comprises at least transverse cuts formed in a first axial side portion and a second axial side portion, respectively,

[0057] The first axial side portion and the second axial side portion respectively include axial portions, the axial widths of which are respectively equal to 50% of the axial widths of the first axial side portion and the second axial side portion, and respectively extend axially outward from the axial inner edges of the first axially outer main circumferential cutout and the second axially outer main circumferential cutout, the first axial side portion and the second axial side portion respectively extend from the axial inner edges of the first axially outer main circumferential cutout and the second axially outer main circumferential cutout,

[0058] Each transverse cutout comprises an axially inner portion extending in an axial portion of said first axial side portion or of said second axial side portion,

[0059] The transverse cuts formed in the first axial side portion include at least one first diffuse pair including a first transverse cut and a second transverse cut, the transverse cuts formed in the second axial side portion include at least one second diffuse pair including a first transverse cut and a second transverse cut,

[0060] Each axially inner portion of each of the first transverse cutout and the second transverse cutout of the first diffuse sound pair and the second diffuse sound pair has a width La1, La2, respectively, satisfying:

[0061] -1≤La1 / La2≤2.5, where La1>1.5mm and La2>1.5mm,

[0062] -1≤La1 / La2≤3.0, where La1>1.5mm and La2≤1.5mm,

[0063] -1≤La1 / La2≤4.0, where La1≤1.5mm,

[0064] Each axially inner portion of each of the first and second transverse cutouts of each of the first and second diffuse sound pairs extends in a general direction forming a first non-zero average angle and a second non-zero average angle with the axial direction, respectively,

[0065] A first average angle of an axially inner portion of the first transverse cutouts of each of the first and second diffuse pairs is different from a second average angle of an axially inner portion of the second transverse cutouts of each of the first and second diffuse pairs.

[0066] In a preferred embodiment, each axially inner portion of the first transverse cutout and the second transverse cutout of the sound-scattering pair has a width La1, La2, respectively, satisfying:

[0067] -1≤La1 / La2≤2.1, where La1>1.5mm and La2>1.5mm,

[0068] -1≤La1 / La2≤2.4, where La1>1.5mm and La2≤1.5mm,

[0069] -1≤La1 / La2≤3.2, where La1≤1.5mm.

[0070] In an advantageous embodiment, the width of the axial inner portion of each of the first and second transverse cutouts of the or each sound diffusing pair is in the range of 0.2 mm to 2.2 mm, preferably 0.2 mm to 1.0 mm, more preferably 0.2 mm to 0.6 mm, still more preferably 0.2 mm to 0.5 mm. Limiting the width of the axial portion limits the noise generated by the sound diffusing cutouts.

[0071] In an advantageous embodiment, the depth of the axially inner portion of each of the first and second transverse cutouts of the or each diffuser pair is in the range 2.0 mm to 5.5 mm, preferably in the range 3.0 mm to 5.0 mm.

[0072] Optionally and preferably, each main circumferential incision has a depth greater than or equal to 75% of the tread pattern height, more preferably greater than or equal to 90% of the tread pattern height.

[0073] In embodiments where the main circumferential cuts are relatively deep, the depth of each main circumferential cut is in the range of 4.0 mm to the tread pattern height, preferably in the range of 5.0 mm to the tread pattern height, more preferably in the range of 5.5 mm to the tread pattern height.

[0074] In the embodiment where the main circumferential cutouts are relatively wide main circumferential grooves, the axial width of each main circumferential cutout is greater than or equal to 1.0 mm, preferably greater than or equal to 5.0 mm, more preferably in the range of 5.0 mm to 20.0 mm.

[0075] In an optional embodiment, it is also conceivable that at least one of the first axial side portion and the second axial side portion includes at least one additional circumferential cut, the depth of which is strictly less than 50% of the tread pattern height, preferably less than or equal to 30% of the tread pattern height, and more preferably in the range of 10% to 30% of the tread pattern height.

[0076] The first non-zero average angle and the second non-zero average angle of the axially inner portion of the first transverse cutout and the second transverse cutout of the or each diffuse sound pair are optionally but advantageously less than or equal to 50°, preferably less than or equal to 40°, and more preferably in the range of 5° to 40°.

[0077] If the mean angle is too small, there is an increased risk that the corners of the transverse cutouts used to diffuse the sound will coincide with the edges of the tire contact patch under most conditions of use, resulting in an increase in the noise generated by the tire. Conversely, if the mean angle is too large, there is an increased risk of tire traction, that is, of generating forces in the axial direction of the tire.

[0078] In some embodiments, the absolute value of the difference between the first average angle and the second average angle of the or each diffuse sound pair is less than or equal to 40°, preferably less than or equal to 30°. Although the use conditions of tires may vary greatly, it is still rare that the use conditions vary so much that the deviation between the angle values ​​is too large.

[0079] In other embodiments, the absolute value of the difference between the first average angle and the second average angle of the or each diffuse sound pair is greater than or equal to 5°, preferably greater than or equal to 10°. Conversely, the greater the degree of increase in the deviation between the angles, the more different the conditions under which noise can be reduced may be.

[0080] In an embodiment where the invention is applied to the first axial side portion and the second axial side portion or each first axial side portion and each second axial side portion having a large number of transverse cuts, the first average angle and the second average angle are equal to values ​​selected from a list of at least first and second values ​​different from each other:

[0081] - at least 25%, preferably at least 50%, more preferably at least 75% of the axially inner portions of the transverse cutouts of at least one of said first and second axial side portions have an average angle equal to one of at least a first value and a second value different from each other,

[0082] - the width La of each axially inner portion of each transverse cutout having a mean angle equal to one of at least a first value and a second value different from each other satisfies:

[0083] ○ 1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, wherein Lamax>1.5mm and La>1.5mm,

[0084] ○ 1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, wherein Lamax>1.5mm and La≤1.5mm,

[0085] ○ 1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm,

[0086] Therein, Lamax is the maximum value of the width of the axially inner portion of the transverse cutout for which the average angle is equal to at least 25%, preferably at least 50%, more preferably at least 75% of one of at least a first value and a second value different from each other.

[0087] Therefore, increasing the number of pairs of transverse cuts having different average angles promotes the dispersion of noise under different usage conditions.

[0088] In these embodiments, it is advantageous that:

[0089] - the average angle of the axially inner portion of at least 15%, preferably at least 25%, of the transverse cutouts of at least one of the first and second axial side portions, respectively, is equal to the first value, and

[0090] - the average angle of the axially inner portion of at least 15%, preferably at least 25% of the transverse cutouts of at least one of said first and second axial side portions, respectively, is equal to a second value.

[0091] Therefore, it is necessary to ensure that a significant number of transverse cuts have an average angle value equal to one of the first value and the second value, and to ensure that the first value and the second value are reached by a significant number of transverse cuts relative to the total number of transverse cuts of the first axial side portion and the second axial side portion respectively.

[0092] In an optional embodiment that even more advantageously disperses noise, the transverse cut formed at least partially in at least one of the first axial side portion and the second axial side portion comprises at least one sound-diffusing three-piece set having a first transverse cut, a second transverse cut and a third transverse cut,

[0093] the first transverse cutout, the second transverse cutout and the third transverse cutout of the or each sound diffusing three-piece set each comprising an axially inner portion extending in an axial portion of at least one of the first and second axial side portions,

[0094] Each axial inner portion of the first transverse cut, the second transverse cut and the third transverse cut of the sound-diffusing three-piece set has a width La1≥La2≥La3, respectively, satisfying:

[0095] -1≤La1 / La3≤2.5, preferably 1≤La1 / La3≤2.1, where La1>1.5mm and La3>1.5mm,

[0096] -1≤La1 / La3≤3.0, preferably 1≤La1 / La3≤2.4, where La1>1.5mm and La3≤1.5mm,

[0097] -1≤La1 / La3≤4.0, preferably 1≤La1 / La3≤3.2, wherein La1≤1.5mm,

[0098] each axially inner portion of each of the first transverse cutout, the second transverse cutout and the third transverse cutout of the or each sound diffusing three-piece set extends in a general direction forming a first non-zero average angle, a second non-zero average angle and a third non-zero average angle with the axial direction, respectively,

[0099] The first average angle, the second average angle and the third average angle of the axial inner portion of the first transverse cutout, the second transverse cutout and the third transverse cutout of the or each sound diffusing three-piece set are different in pairs.

[0100] In other words, the first average angle is different from the second average angle, the second average angle is different from the third average angle, and the first average angle is different from the third average angle.

[0101] By adopting three average angle values, more conditions of use for effectively dispersing noise can be taken into account. In the case of a mold comprising a plurality of different patterns, the number of average angles is advantageously chosen to be equal to the number of different patterns, so as to limit the design complexity of the mold and to correspond to one (and only one) average angle for each pattern.

[0102] Similar to the optional setting of paired transverse cuts, the first non-zero average angle, the second non-zero average angle and the third non-zero average angle of the axial inner portion of the first transverse cut, the second transverse cut and the third transverse cut of the sound-diffusing three-piece set or each sound-diffusing three-piece set are respectively less than or equal to 50°, preferably less than or equal to 40°, and more preferably in the range of 5° to 40°.

[0103] Similar to the optional arrangement of paired transverse cuts, the absolute values ​​of the differences of the following are all less than or equal to 40°, preferably less than or equal to 30°, and / or greater than or equal to 5°, preferably greater than or equal to 10°:

[0104] - a first mean angle and a second mean angle of the or each diffuse three-piece set,

[0105] - the second mean angle and the third mean angle of the or each diffuse triplet,

[0106] - the first mean angle and the third mean angle of the or each diffuse triplet.

[0107] Similar to the optional arrangement of paired transverse cuts, the first average angle, the second average angle and the third average angle are equal to values ​​selected from a list of at least first, second and third values ​​that are two-by-two different:

[0108] - at least 25%, preferably at least 50%, more preferably at least 75% of the axially inner portions of the transverse cutouts of at least one of the first and second axial side portions have an average angle equal to one of at least a first value, a second value and a third value that are different from one another,

[0109] - the width La of each axially inner portion of each transverse cutout having an average angle equal to at least one of a first value, a second value and a third value different from each other satisfies:

[0110] ○ 1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, wherein Lamax>1.5mm and La>1.5mm,

[0111] ○ 1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, wherein Lamax>1.5mm and La≤1.5mm,

[0112] ○ 1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm,

[0113] Therein, Lamax is the maximum value of the width of the axially inner portion of the transverse cutout having an average angle equal to at least 25%, preferably at least 50%, more preferably at least 75% of one of at least the first, second and third values ​​that are two-to-two different.

[0114] Also similar to the optional arrangement of paired transverse incisions,

[0115] - the average angle of the axially inner portion of at least 15%, preferably at least 25%, of the transverse cutouts of at least one of said first and second axial side portions, respectively, is equal to a first value,

[0116] - the average angle of the axially inner portion of at least 15%, preferably at least 25%, of the transverse cutouts of at least one of the first and second axial side portions, respectively, is equal to the second value, and

[0117] - the average angle of the axially inner portion of at least 15%, preferably at least 25% of the transverse cutouts of at least one of said first and second axial side portions, respectively, is equal to a third value.

[0118] In certain embodiments, the first and second transverse cuts of the or each diffuse pair are circumferentially adjacent.

[0119] This reduces the possibility that two circumferentially adjacent transverse cuts generate the same external noise under given conditions of use. The dispersion of the noise generated is thus improved under given conditions of use, in particular when these given conditions of use result in the edges of at least some of the transverse cuts coinciding with the edges of the tyre contact patch.

[0120] The expression "circumferentially adjacent" means that no transverse cutouts are provided between the transverse cutouts of the diffuser pair in the circumferential direction, the width La of the axially inner portion of which satisfies the following conditions:

[0121] -1≤La1 / La2≤2.5, preferably 1≤La1 / La2≤2.1, where La1>1.5mm and La2>1.5mm,

[0122] -1≤La1 / La2≤3.0, preferably 1≤La1 / La2≤2.4, where La1>1.5mm and La2≤1.5mm,

[0123] -1≤La1 / La2≤4.0, preferably 1≤La1 / La2≤3.2, where La1≤1.5mm.

[0124] Similarly, in the case of a trio of circumferentially adjacent transverse cuts, some embodiments provide that the first, second and third transverse cuts of the or each acoustically diffuse trio are circumferentially adjacent.

[0125] Similar to the sound-scattering pair, the expression "circumferentially adjacent" means that there is no transverse cutout whose axial inner portion width La satisfies the following conditions between the transverse cutouts of the sound-scattering three-piece set in the circumferential direction:

[0126] -1≤La1 / La3≤2.5, preferably 1≤La1 / La3≤2.1, where La1>1.5mm and La2>1.5mm,

[0127] -1≤La1 / La3≤3.0, preferably 1≤La1 / La3≤2.4, where La1>1.5mm and La2≤1.5mm,

[0128] -1≤La1 / La3≤4.0, preferably 1≤La1 / La3≤3.2, where La1≤1.5mm.

[0129] The absolute value of the difference between the first and second average angles of circumferentially adjacent first and second transverse cuts of the or each diffuse pair is optionally but advantageously less than or equal to 20°.

[0130] This is because, if the axial portions in which the average angles differ too much belong to circumferentially adjacent transverse cuts for sound diffusion, there is a risk that the difference in stiffness between adjacent rubber blocks is too great, which may lead to uneven wear. In this case, limiting the difference in these average angles reduces the difference in stiffness between these adjacent rubber blocks, thus promoting uniform wear of the tread.

[0131] The absolute value of the difference between the first and second average angles of circumferentially adjacent first and second transverse cuts of the or each diffuse pair is optionally but advantageously greater than or equal to 5°, preferably greater than or equal to 10°.

[0132] Sufficient differences between the average angles reduce the noise generated by adjacent transverse cuts of the tire under sufficiently different usage conditions.

[0133] Similar to the optional setting of paired transverse cuts, the absolute value of the difference between one of the first average angle, the second average angle and the third average angle of the circumferentially adjacent first transverse cut, the second transverse cut and the third transverse cut of the sound-diffusing three-piece set or each sound-diffusing three-piece set and at least another of the first average angle, the second average angle and the third average angle is less than or equal to 20° and / or greater than or equal to 5°, preferably greater than or equal to 10°.

[0134] In a preferred embodiment, the tread comprises N circumferentially adjacent transverse cuts, wherein the N circumferentially adjacent transverse cuts form N pairs of circumferentially adjacent transverse cuts in the circumferential rotation direction around the tire, and the width La of each axially inner portion of each of the N circumferentially adjacent transverse cuts satisfies:

[0135] -1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, where Lamax>1.5mm and La>1.5mm,

[0136] -1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, where Lamax>1.5mm and La≤1.5mm,

[0137] -1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm,

[0138] where Lamax is the maximum value of the width of the axial inner portion of the transverse cutout of N pairs of circumferentially adjacent transverse cutouts,

[0139] At least 25%, preferably at least 35%, of the N pairs of N circumferentially adjacent transverse cutouts have a different average angle of the axially inner portion.

[0140] In other words, at least 25%, at least 50% of the N pairs of circumferentially adjacent transverse cuts are diffuse pairs.

[0141] Similarly, in the case of three sets of circumferentially adjacent transverse cuts, some embodiments are such that: the tire includes N circumferentially adjacent transverse cuts and N three sets of circumferentially adjacent transverse cuts in a direction of circumferential rotation about the tire, the width La of each axially inner portion of each of the N circumferentially adjacent transverse cuts satisfies:

[0142] -1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, where Lamax>1.5mm and Lai>1.5mm,

[0143] -1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, where Lamax>1.5mm and Lai≤1.5mm,

[0144] -1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm,

[0145] Wherein, Lamax is the maximum value of the width of the axial portion of the transverse cuts of N three sets of circumferentially adjacent transverse cuts,

[0146] At least 15%, preferably at least 20%, of the average angles of the axial portions of the N circumferentially adjacent transverse cutouts of the N sets of three differ in pairs.

[0147] In other words, at least 15%, at least 20% of the N pairs of circumferentially adjacent transverse cuts are sound-diffusing three-piece sets.

[0148] In a preferred embodiment for further improving the uniformity of tread wear, the tire comprises a plurality of diffuser pairs, each diffuser pair comprising a first transverse incision and a second transverse incision circumferentially adjacent in a circumferential rotation direction around the tire,

[0149] The absolute value of the difference between the first average angle and the second average angle of the circumferentially adjacent first and second transverse cuts of at least 25%, preferably at least 50%, and more preferably at least 75% of the sound diffusing pairs is less than or equal to 20°.

[0150] In a preferred variant for further reducing the noise generated by the tire under sufficiently different conditions of use, the tire comprises a plurality of sound-diffusing pairs, each sound-diffusing pair comprising a first transverse incision and a second transverse incision circumferentially adjacent in a circumferential rotation direction around the tire,

[0151] The absolute value of the difference between the first average angle and the second average angle of the circumferentially adjacent first transverse cuts and the second transverse cuts of at least 25%, preferably at least 50%, and more preferably at least 75% of the sound-scattering pairs is greater than or equal to 5°, preferably greater than or equal to 10°.

[0152] Similar to the optional setting of paired transverse cuts, at least 25%, preferably at least 50%, and more preferably at least 75% of the sound-diffusing three-piece set of circumferentially adjacent first, second, and third transverse cuts have an absolute value of the difference between one of the first average angle, the second average angle, and the third average angle and at least another of the first average angle, the second average angle, and the third average angle less than or equal to 20° and / or greater than or equal to 5°, preferably greater than or equal to 10°.

[0153] In a preferred but optional embodiment, each axially inner portion of each transverse cut of the sound diffusing pair or sound diffusing three-piece set or each sound diffusing pair or each sound diffusing three-piece set extends axially for a length equal to at least 20%, preferably at least 35%, of the axial length of each transverse cut of the sound diffusing pair or sound diffusing three-piece set formed in at least one of the first axial side portion and the second axial side portion.

[0154] The longer the axial length of the axial portion that contributes to dispersing noise, the more dispersive the noise produced by each transverse cutout of the or each pair or triplet of sound diffusers.

[0155] In some embodiments, the axially inner portion does not extend beyond the entire length of the axial portion of at least one of the first axial side portion and the second axial side portion. In other embodiments, the axially inner portion extends beyond the entire length of the axial portion of at least one of the first axial side portion and the second axial side portion.

[0156] Since the tread is intended to come into contact with the ground via the tread surface when the tire is running, the curve length is determined in the relevant portion of the tread and is therefore limited to the tread surface and thus to the first and second axial side portions.

[0157] The axial length of a transverse cut portion or a part of a transverse cut (whether or not it belongs to a diffuse sound pair or a diffuse sound three-piece set) is the length measured in the axial direction between the two ends of the transverse cut portion or a part of the transverse cut.

[0158] In some variant forms, each transverse cut of the sound diffusing pair or sound diffusing three-piece set or each sound diffusing pair or each sound diffusing three-piece set includes an axially outer portion that is connected to the axially inner portion and is axially arranged outside the axially inner portion, and the axially outer portion is the axially outermost portion of each transverse cut of the sound diffusing pair or sound diffusing three-piece set or each sound diffusing pair or each sound diffusing three-piece set formed in at least one of the first axial side portion and the second axial side portion.

[0159] In these variant forms, preferably, the axially outer portion of each transverse cut of the sound-diffusing pair or sound-diffusing three-piece set or each sound-diffusing pair or each sound-diffusing three-piece set extends along a general direction, and the average angle formed by the general direction with the axial direction is strictly smaller than the average angle formed by the general direction of the axial inner portion of at least one transverse cut of the sound-diffusing pair or sound-diffusing three-piece set or each sound-diffusing pair or each sound-diffusing three-piece set.

[0160] In particular, in the portion of the tread surface corresponding to the axial portion, the contact patch is straight. Conversely, in the portion of the tread surface corresponding to the axially outer portion, the contact patch is rounded due to the curvature of the tire. Therefore, since the contact patch angle in the axial portion is relatively large and straight, the front edge of the axially inner portion will gradually (i.e. over a relatively long time) come into contact with the ground, limiting the noise compared to the case where the cut forms an average angle of substantially zero with the axial direction and the entire front edge is in contact with the ground at the same time. Similarly, since the contact patch angle in the axially outer portion is small and rounded, the front edge will also gradually come into contact with the ground, which also helps to limit the noise.

[0161] Therefore, advantageously, in order to minimize the noise generated by each axially outer portion, the average angle formed by the overall direction of the axially outer portions with the axial direction is optionally strictly less than 25°, preferably less than or equal to 20°, more preferably less than or equal to 15°.

[0162] For each transverse cut of the or each acoustically diffuse pair or trio, the average angle formed by the general direction of the axially outer portion with the axial direction is preferably substantially the same.

[0163] Furthermore, in an optional embodiment, the width of the axially outer portion is strictly greater than the width of the axial portion. Thus, the wide axially outer portion makes it possible to effectively drain water from the contact patch between the tread surface and the ground on which the tire runs.

[0164] The width of the axially outer portion optionally ranges from 0.7 mm to 5.0 mm, preferably from 1.0 mm to 5.0 mm, preferably from 2.0 mm to 4.5 mm.

[0165] The depth of the axially outer portion optionally ranges from 2.0 mm to 5.5 mm.

[0166] In other embodiments, each transverse cut of the or each pair or trio of diffusers comprises an axial terminal portion formed axially outwardly of at least one of the first and second axial side portions and communicating with the wide axial outer portion. This promotes drainage of water from the contact patch between the tread surface and the ground on which the tire is running.

[0167] The above features relate to the transverse cuts formed in at least one of the first axial side portion and the second axial side portion. In some preferred embodiments, they can also be applied to the transverse cuts of the diffuser pair or diffuser three-piece set or each diffuser pair or each diffuser three-piece set formed in the first axial side portion and the second axial side portion, respectively.

[0168] In conventional manner, the tyre comprises a crown, two sidewalls and two beads, each sidewall connecting each bead to the crown. Again in conventional manner, the crown comprises a tread and a crown reinforcement arranged radially on the inside of the tread. The tyre also comprises a carcass reinforcement anchored in each bead and extending radially in each sidewall and axially in the crown radially on the inside of the crown reinforcement.

[0169] In conventional manner, the crown reinforcement comprises at least one crown layer having reinforcing elements. These reinforcing elements are preferably textile or metal filamentary elements.

[0170] In an embodiment for obtaining the properties of a tyre known as a radial tyre, for example as defined by ETRTO, the carcass reinforcement comprises at least one carcass layer, the or each carcass layer comprising filamentary carcass reinforcing elements, each filamentary carcass reinforcing element extending substantially in a main direction forming an angle with the circumferential direction of the tyre having an absolute value ranging from 80° to 90°. BRIEF DESCRIPTION OF THE DRAWINGS

[0171] The invention will be better understood on reading the following description given by way of non-limiting example only and with reference to the accompanying drawings, in which:

[0172] - Figure 1 is a top view of the tread of a tire according to the present invention,

[0173] - Figure 2 for Figure 1 Meridian section of the tire parallel to the tire rotation axis,

[0174] - Figure 3 for Figure 1 a cross-sectional view of a tire showing the arrangement of the filamentary reinforcing elements in and under the crown,

[0175] - Figure 4 For the control tire Figure 1 Similar diagrams, which may demonstrate the advantages of the present invention, and

[0176] - Figure 5 and Figure 6 Shows Figure 1 The tire according to the present invention and Figure 4 Noise comparison test results between the control tires in . DETAILED DESCRIPTION

[0177] In the figures relating to the tire, reference frames X, Y, Z are shown, corresponding respectively to the usual axial direction (Y), radial direction (Z) and circumferential direction (X) of the tire.

[0178] Figures 1 to 3 A tyre according to the invention is shown which is indicated with the overall reference numeral 10. The tyre 10 has a generally toroidal shape about an axis of rotation substantially parallel to the axial direction Y. The tyre 10 is intended for passenger vehicles and has a size of 205 / 55R16. The tyre 10 is a summer tyre. In the various figures, the tyre 10 is depicted as brand new, i.e. it has not yet been driven.

[0179] refer to Figure 2 The tyre 10 comprises a crown 12 comprising a tread 14 intended to come into contact with the ground when the tyre is running, and a crown reinforcement 16 extending in the crown 12 in a circumferential direction X. The tyre 10 also comprises a layer 18 airtight with respect to the inflation gas and intended to delimit a closed internal cavity with a mounting support of the tyre 10 when the tyre 10 has been mounted on the mounting support, such as a rim.

[0180] The crown reinforcement 16 comprises a working reinforcement 20 and a hoop reinforcement 22. The working reinforcement 20 comprises at least one working layer, in this case two working layers including a radially inner working layer 24 arranged radially on the inside of a radially outer working layer 26.

[0181] The hoop reinforcement 22 includes at least one (in this case one) hoop layer 28 .

[0182] The crown reinforcement 16 is radially covered by the tread 14 . In this case, the hoop reinforcement 22 , in this case a hoop layer 28 , is arranged radially on the outside of the working reinforcement 20 , and is therefore radially interposed between the working reinforcement 20 and the tread 14 .

[0183] The tire 10 comprises two sidewalls 30 extending the crown 12 radially inwardly. The tire 10 also comprises two beads 32 radially inside the sidewalls 30. Each sidewall 30 connects each bead 32 to the crown 12.

[0184] The tire 10 comprises a carcass reinforcement 34 anchored in each bead 32 and in this case turned up around the bead wire 33. The carcass reinforcement 34 extends radially in each sidewall 30 and axially in the crown 12 radially inside the crown reinforcement 16. The crown reinforcement 16 is arranged radially between the tread 14 and the carcass reinforcement 34. The carcass reinforcement 34 comprises at least one carcass layer 36.

[0185] refer to Figure 2 , the tire 10 includes a tread layer 110 and a backing layer 112 of the tread layer 110. The backing layer 112 is arranged radially inside the tread layer 110 and has extremely low rolling resistance.

[0186] refer to Figure 2 and Figure 3 , each working layer 24 , 26 , the hoop layer 28 and the carcass layer 36 comprises an elastomeric matrix in which the filamentary reinforcing element or elements of the corresponding layer are embedded.

[0187] The hoop reinforcement 22 (in this case the hoop layer 28) comprises one or more filamentary hoop reinforcing elements 280, which are spirally wound circumferentially in a main direction D0, which forms an angle AF with the circumferential direction X of the tire 10, the absolute value of which is less than or equal to 10°, preferably less than or equal to 7°, more preferably less than or equal to 5°. In this case, AF=-5°.

[0188] The radially inner working layer 24 and the radially outer working layer 26 each comprise a filamentary working reinforcing element 240, 260 extending in a main direction D1, D2 respectively forming oppositely oriented angles AT1 and AT2 with an absolute value strictly greater than 10°, preferably ranging from 15° to 50°, more preferably ranging from 15° to 30° with the circumferential direction X of the tire 10. In this case, AT1=-26° and AT2=+26°.

[0189] The carcass layer 36 comprises filamentary carcass reinforcing elements 360 extending in a main direction D3 forming with the circumferential direction X of the tyre 10 an angle AC of absolute value greater than or equal to 60°, preferably ranging from 80° to 90° and in this case AC=+90°.

[0190] For example, each of the filamentary hoop reinforcement elements 280, the working reinforcement elements 240, 260 and the carcass reinforcement element 360 is identical to that described in applications WO2021250331, WO2022074341 and WO2022069819.

[0191] refer to Figure 1 and Figure 2 , the tread 14 comprises a tread surface 38 via which the tread 14 comes into contact with the ground. The tread surface 38 is intended to come into contact with the ground when the tire 10 is running on the ground. The tread surface 38 is axially delimited by a first axial edge 41 and a second axial edge 42 passing through each point N arranged on either side of the midplane M, wherein for each point N, the angle between a tangent T to the tread surface 38 and a straight line R parallel to the axial direction Y and passing through said point is equal to 30°.

[0192] The tread 14 includes an axially central portion P0 and first and second axially side portions P1 and P2, which are axially arranged outside the axially central portion P0 and axially on both sides of the axially central portion P0 relative to the midplane M of the tire 10. The first and second axially side portions P1 and P2 each have an axial width L1, L2, respectively, satisfying L1 = 30.3 mm and L2 = 25.4 mm.

[0193] The tread 14 comprises N>1 main circumferential incisions, in this case N main circumferential grooves, including a first main circumferential incision, a second main circumferential incision, a third main circumferential incision and a fourth main circumferential incision, respectively indicated by reference numerals 52, 54, 56, 58. The first main circumferential incision 52 and the second main circumferential incision 54 are axially arranged on both sides of the midplane M of the tire 10 and are the axially outermost main circumferential incisions of the tread 14.

[0194] The first axial side portion P1 and the second axial side portion P2 are respectively arranged axially outside the first axially outer main circumferential cutout 52 and the second axially outer main circumferential cutout 54. The first axial side portion P1 axially extends from the first axial edge 41 of the tread surface 38 to the axially outer edge 43 of the first main circumferential cutout 52. The second axial side portion P2 axially extends from the second axial edge 42 of the tread surface 38 to the axially outer edge 44 of the second main circumferential cutout 54.

[0195] The depth Hr of each main circumferential cut 52 to 58 ranges from 4.0 mm to the tread pattern height Hs, preferably ranges from 5.0 mm to the tread pattern height Hs, and more preferably ranges from 5.5 mm to the tread pattern height Hs. The depth Hr is each greater than or equal to 50% of the tread pattern height Hs. In this case, Hs=6.5 mm, Hr1=6.3 mm of the first axially outer main circumferential cut 52 and the second axially outer main circumferential cut 54, and Hr2=6.5 mm of each main circumferential cut 56, 58 of the axial central portion P0. Therefore, the depth of each main circumferential cut 52, 54, 56, 58 advantageously satisfies Hr1 / Hs≥75%, Hr2 / Hs≥75%, and more preferably Hr1 / Hs≥90%, Hr2 / Hs≥90%.

[0196] The axial width Lr1, Lr2, Lr3, Lr4 of each main circumferential cutout 52 to 58 is respectively greater than or equal to 1.0 mm, preferably greater than or equal to 5.0 mm, more preferably ranging from 5.0 mm to 20.0 mm. In this case, Lr1 = 6.6 mm, Lr2 = 11.7 mm, Lr3 = 8.8 mm and Lr4 = 10.0 mm.

[0197] The axial central portion P0 comprises central ribs, in this case first, second and third central ribs respectively indicated by reference numerals 62, 64, 66. Each central rib 62, 64, 66 is arranged axially between two adjacent main circumferential cutouts 52 to 58.

[0198] Each central rib 62 , 64 , 66 comprises a transverse cutout 74 , 75 , 76 having a width equal to 0.4 mm and a depth equal to 3.0 mm.

[0199] The first axial side portion P1 and the second axial side portion P2 each include a first side rib and a second side rib, respectively, indicated by reference numerals 68 and 70, respectively, in this case constituted by respective first side ribs 68 and second side ribs 70. The first axial side portion P1 and the second axial side portion P2 each include an axial portion P11 and P21, the axial width of which is equal to 50% of the axial width L1 and L2 of the first axial side portion P1 and the second axial side portion P2, respectively. The axial portions P11 and P21 each extend axially outwards starting from the axial outer edges 43 and 44, respectively, and the first axial outer main circumferential cutouts 52 and the second axial outer main circumferential cutouts 54 each extend from the axial outer edges 43 and 44, respectively.

[0200] The tread 14 comprises N transverse cuts 80, 90, which are partially formed in at least one of the first axial side portion P1 and the second axial side portion P2, in this case at least partially formed in each of the first axial side portion P1 and the second axial side portion P2, respectively. In this case, N=87. Thus, the N transverse cuts 80, 90 form N pairs of transverse cuts 80, which are circumferentially adjacent in the circumferential rotation direction S around the tire 10. Similarly, the tread 14 comprises a set of three N (in this case, N=87) transverse cuts 80, which are circumferentially adjacent in the circumferential rotation direction S around the tire 10. Figure 2 The bottom of the cutout 80 is shown in dashed lines.

[0201] Each transverse cutout 80, 90 includes a narrow portion 82, 92 and a wide portion 84, 94, respectively.

[0202] Each narrow portion 82, 92 includes an axial inner portion 86, 96 extending in the axial portion P11, P21 of the first axial side portion P1 and the second axial side portion P2, respectively. Each narrow portion 82, 92 also includes an additional portion 88, 98 arranged outside the axial portion P11, P21 of the first axial side portion P1 and the second axial side portion P2, respectively.

[0203] Each wide portion 84, 94 includes an axially outer portion, in this case, each wide portion 84, 94 is composed of an axially outer portion 84, 94, which is arranged outside the axial portions P11, P21 of the first axial lateral portion P1 and the second axial lateral portion P2, respectively. Each axially outer portion 84, 94 communicates with each axially inner portion 86, 96, respectively, and is axially arranged outside each axially inner portion 86, 96, respectively.

[0204] Each axially inner portion 86, 96 is the axially innermost portion of each transverse cutout 80, 90. Each axially inner portion 86, 96 enters each of the main circumferential cutouts 52, 54 adjacent thereto, respectively.

[0205] Each axially outer portion 84 , 94 is the axially outermost portion of each transverse cutout 80 , 90 .

[0206] Each transverse cutout 80, 90 extends along an axial length Lot1, Lot2 of the portion of each transverse cutout 80, 90 formed in the first axial side portion P1 and the second axial side portion P2, respectively. In this case, Lot1=L1=30.3 mm and Lot2=L2=25.4 mm. Each axially inner portion 86, 96 of each transverse cutout 80, 90 extends along an axial length Li1, Li2, which is equal to at least 20%, preferably at least 35%, and in this case equal to 50% of the axial length Lot1, Lot2 of the portion of each transverse cutout 80, 90 formed in the first axial side portion P1 and the second axial side portion, respectively. In this case, Li1=15.2 mm and Li2=12.7 mm.

[0207] The width La of each axially inner portion 86, 96 ranges from 0.2 mm to 2.2 mm, preferably from 0.2 mm to 1.0 mm, more preferably from 0.2 mm to 0.6 mm, still more preferably from 0.2 mm to 0.5 mm, in which case La = 0.4 mm. The depth of each axially inner portion 86, 96 ranges from 2.0 mm to 5.5 mm, preferably from 3.0 mm to 5.0 mm, in which case it is equal to 4.5 mm.

[0208] The width Lb of each axially outer portion 84, 94 is strictly greater than the width of each axially inner portion 86, 96, respectively. Each width Lb ranges from 0.7 mm to 5.0 mm, preferably from 1.0 mm to 5.0 mm, more preferably from 2.0 mm to 4.5 mm, in this case equal to 2.3 mm, 2.8 mm or 3.3 mm, depending on which pattern the cutout belongs to, described below. The depth of each axially outer portion 84, 94 ranges from 2.0 mm to 5.5 mm, in this case equal to 5.1 mm.

[0209] The tire 10 is obtained by molding a green tire in a mold including a plurality of different patterns. Figure 1, the joint J between two circumferentially adjacent patterns is indicated by a solid line. In this case, the mold comprises three different patterns, which are randomly distributed in order to mold the tread 14. Therefore, the tread 14 comprises three different patterns A, B, C, which are distributed in the circumferential rotation direction S around the tire as follows: AABACBBCCABCBABAAABBCBAABCCCBAAAABBCBCBAAA BCCCBAAAAAABCBCCCBAAAABCCBABCCCBAAAAAABCBABAB.

[0210] The transverse cutout 80 formed at least partially in the first axial side portion P1 will now be described separately. The features of the transverse cutout 90 formed at least partially in the second axial side portion P2 may be inferred mutatis mutandis from this.

[0211] Each axially inner portion 86 of each transverse cut 80 of each pattern A, B, C respectively extends along a general direction forming a non-zero average angle with the axial direction Y. In the embodiment shown, at least 25%, preferably at least 50%, more preferably at least 75%, in this case 100% of the axially inner portions 86 of the transverse cuts 80 have an average angle equal to a value selected from the list of first, second and third values ​​FA, FB, FC. The angle values ​​FA, FB and FC are different from each other. Each axially outer portion 84 of each transverse cut 80 extends along a general direction forming a non-zero average angle FG with the axial direction Y. The non-zero average angle FG of each transverse cut 80 is substantially the same.

[0212] More specifically, at least 15%, preferably at least 25%, in which case 41% of the transverse cuts 80 have each average angle of the axially inner portion 86 equal to the first value FA, at least 15%, preferably at least 25%, in which case 32% of the transverse cuts 80 have each average angle of the axially inner portion 86 equal to the second value FB, and at least 15%, preferably at least 25%, in which case 27% of the transverse cuts 80 have each average angle of the axially inner portion 86 equal to the third value FC.

[0213] At least 25%, preferably at least 35%, in this case 61%, of the N pairs of N circumferentially adjacent transverse cutouts 80 have a different average angle of the axially inner portion 86 .

[0214] The average angles of the axially inner portions 86 of the N circumferentially adjacent transverse cutouts 80 of the N sets of three differ in pairs from each other in at least 15%, preferably at least 20%, in this case 21%.

[0215] Each non-zero average angle of each axially inner portion 86, 96 is less than or equal to 50°. In this case, FA=5°, FB=25° and FC=45°. The average angle FG is strictly less than 25°, preferably less than or equal to 20°, more preferably less than or equal to 15°, and in this case equal to 10°, regardless of the pattern A, B, C.

[0216] In this case, the width La of each axially inner portion 86 of each of the N transverse cuts 80 satisfies 1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, where Lamax is the maximum value of the width of the axially inner portion 86 of the transverse cut 80. In this case, Lamax=La=0.4 mm.

[0217] The transverse cutouts 80 formed in the first axial side portion P1 include a plurality of sound diffusing pairs and a plurality of sound diffusing triplets, which will now be described in greater detail.

[0218] exist Figure 1 In the figure, the arrangement of the pattern AABACBBCCA is shown, and a plurality of diffuse sound pairs and diffuse sound triplets can be determined. Some diffuse sound pairs and diffuse sound triplets include transverse cuts 80 that are not adjacent in the circumferential direction in the rotation direction S, while other diffuse sound pairs and diffuse sound triplets include transverse cuts 80 that are adjacent in the circumferential direction in the rotation direction S.

[0219] refer to Figure 1 First, described are the sound-scattering pairs including two transverse cuts 80 that are not adjacent in the circumferential direction in the rotation direction S (taking the first transverse cut 801 and the second transverse cut 802 as an example) and the sound-scattering pairs including two transverse cuts 80 that are adjacent in the circumferential direction in the rotation direction S (taking the first transverse cut 811 and the second transverse cut 812 as an example).

[0220] The first transverse cutout 801 and the second transverse cutout 802 each include an axial inner portion 861, 862, and the axial inner portions 861, 862 extend along a general direction forming a first non-zero average angle F1 and a second non-zero average angle F2 with the axial direction Y, respectively. The first average angle F1 is different from the second average angle F2. Similarly, the first transverse cutout 811 and the second transverse cutout 812 each include an axial inner portion 871, 872, and the axial inner portions 871, 872 extend along a general direction forming a first non-zero average angle F11 and a second non-zero average angle F12 with the axial direction Y, respectively. The first average angle F11 is different from the second average angle F12.

[0221] The first and second average angles F1, F2 and F11, F12 are equal to values ​​selected from a list of at least first and second values ​​different from each other, in this case, from a list of first, second and third values ​​different from each other, the list consisting of the values ​​FA, FB, FC.

[0222] In the pairs shown, F1 = FA, F2 = FC, F11 = FC and F12 = FB.

[0223] The absolute value of the difference between the first average angle and the second average angle of each diffuse sound pair is less than or equal to 40° and greater than or equal to 5°, preferably greater than or equal to 10°. In this case, |F1-F2|=40° and |F11-F12|=20°.

[0224] As for the diffuse sound pairs including the first and second transverse cuts adjacent to each other in the circumferential direction in the rotation direction S, at least 25%, preferably at least 50%, in this case 57% of the diffuse sound pairs have an absolute value of the difference between the first and second average angles of the first and second transverse cuts adjacent to each other in the circumferential direction at least less than or equal to 20° and greater than or equal to 5°, preferably greater than or equal to 10°. These 57% of diffuse sound pairs include diffuse sound pairs including the first transverse cut 811 and the second transverse cut 812. Specifically, |F11-F12|=20°.

[0225] Also refer to Figure 1 What is now described is a sound-diffusing three-piece set including three transverse cuts 80 that are not adjacent in the circumferential direction in the rotation direction S (taking the first transverse cut 801, the second transverse cut 812 and the third transverse cut 802 as examples) and a sound-diffusing three-piece set including three transverse cuts 80 that are adjacent in the circumferential direction in the rotation direction S (taking the first transverse cut 801, the second transverse cut 811 and the third transverse cut 812 as examples).

[0226] In the case of a sound-diffusing three-piece set including the first transverse cutout 801, the second transverse cutout 812, and the third transverse cutout 802 that are not adjacent in the circumferential direction, the first average angle F1, the second average angle F12, and the third average angle F2 are different in pairs. Similarly, in the case of a sound-diffusing three-piece set including the first transverse cutout 801, the second transverse cutout 811, and the third transverse cutout 812 that are adjacent in the circumferential direction, the first average angle F1, the second average angle F11, and the third average angle F12 are different in pairs.

[0227] The first, second and third average angles F1, F12, F2 and F1, F11, F12 are equal to values ​​selected from a list of at least first, second and third values ​​that are different from each other, in this case, equal to values ​​selected from a list of first, second and third values ​​that are different from each other, the list consisting of the values ​​FA, FB, FC.

[0228] The absolute value of the difference between the first average angle and the second average angle of each sound-diffusing three-piece set, the absolute value of the difference between the second average angle and the third average angle of each sound-diffusing three-piece set, and the absolute value of the difference between the first average angle and the third average angle of each sound-diffusing three-piece set are less than or equal to 40° and greater than or equal to 5°, preferably greater than or equal to 10°. Here, in the case of a sound-diffusing three-piece set including a first transverse cut 801, a second transverse cut 812, and a third transverse cut 802 that are not adjacent in the circumferential direction, |F1-F12|=20°, |F12-F2|=20°, and |F1-F2|=40°. In the case of a sound-diffusing three-piece set including a first transverse cut 801, a second transverse cut 811, and a third transverse cut 812 that are adjacent in the circumferential direction, |F1-F11|=40°, |F11-F12|=20°, and |F1-F12|=20°.

[0229] As for the sound-diffusing three-piece set including a first transverse cut, a second transverse cut and a third transverse cut that are circumferentially adjacent to each other in the rotation direction S, at least 25%, preferably at least 50%, more preferably at least 75%, and in this case 100% of the sound-diffusing three-piece set, the absolute value of the difference between one of the first average angle, the second average angle and the third average angle of the circumferentially adjacent first transverse cut, the second transverse cut and the third transverse cut and at least another of the first average angle, the second average angle and the third average angle is less than or equal to 20° and greater than or equal to 5°, preferably greater than or equal to 10°.

[0230] The non-zero average angle FG of the axially outer portion 84, 94 of each transverse cut 80, 90 of each sound-diffusing pair or sound-diffusing trio is strictly smaller than the average angle formed by the general direction of the axially inner portion of at least one transverse cut of each sound-diffusing pair or sound-diffusing trio, in this case smaller than the angles F2, F11 and F12.

[0231] Comparison test

[0232] The tire 10 described above is Figure 4 A control tire is shown for comparison and is designated by reference numeral T. Control tire T is identical to tire 10 except that transverse cuts 80 , 90 are identical to cuts 812 of tire 10 .

[0233] The exterior noise generated by tire 10 and control tire T was measured by mounting them on the same vehicle and driving them under the same conditions. The vehicle was driven on a track certified by UTAC according to ISO 10844. Müller-BBM vibroacoustic collection materials were installed in the measurement areas defined on the track. The noise measured in the field was corrected for changes in ground temperature as indicated in UN Regulation No. R117.

[0234] In the first test, the noise generated by each tire was measured at different steady speeds of 40km / h, 50km / h, 60km / h, 70km / h, 80km / h and 90km / h. Figure 5 The external noise B (in dB) generated by the tire 10 and represented by the curve 10 and the external noise B (in dB) generated by the tire T and represented by the curve T are shown for different stable speeds V in km / h.

[0235] It will be observed that at 50 km / h and 80 km / h (which are conventional speeds used to evaluate the noise performance of passenger vehicle tires under urban and suburban use conditions), the noise generated by tire 10 is at least 1 dB lower than that of control tire T, indicating a significant improvement under both use conditions.

[0236] The second test was used to measure the noise produced by each tire at different accelerations at a speed of 50 km / h. The acceleration of the vehicle was also measured at a speed of 50 km / h. Figure 6 The external noise B (in dB) generated by the tire 10 and represented by the curve 10 and the external noise B (in dB) generated by the tire T and represented by the curve T are shown for different accelerations A in m / s-2.

[0237] Here again, it is observed that, regardless of the acceleration used, the noise produced by tire 10 is at least 1 dB lower than that of control tire T, indicating a significant improvement regardless of the acceleration conditions.

[0238] The present invention is not limited to the above-described embodiments.

[0239] In particular, it is conceivable that the transverse cuts formed in the first axial side portion and the second axial side portion or in one of the first axial side portion and the second axial side portion do not all belong to the embodiment of the sound-diffusing pair or the sound-diffusing three-piece set. Therefore, in a variant form of the previous embodiment, in addition to the transverse cuts 80, 90, transverse cuts that are all identical and have a width La1 equal to 3.0 mm, for example, are also possible. These transverse cuts do not satisfy the relationship 1≤La1 / La2≤3.0 (in this case, La2=0.5 mm and La1>1.5 mm), and therefore do not belong to the sound-diffusing pair or the sound-diffusing three-piece set.

[0240] In other embodiments, the first non-zero average angle, the second non-zero average angle and the third non-zero average angle of the axial inner portion of each first transverse cut, second transverse cut and third transverse cut of each sound-diffusing pair or sound-diffusing trio are respectively less than or equal to 50°, preferably less than or equal to 40°, and more preferably in the range of 5° to 40°. For example, it is conceivable that FA=8°, FB=27° and FC=35°.

[0241] In other embodiments, it is also conceivable that the tread does not have any diffuser triads but only diffuser pairs.

Claims

1. A tyre (10) for a passenger vehicle, the tyre (10) comprising a tread (14) intended to come into contact with the ground via a tread surface (38) when the tyre (10) is running, the tread (14) comprising: - main circumferential cuts (52, 54, 56, 58), the depth (Hr1, Hr2) of the main circumferential cuts (52, 54, 56, 58) being greater than or equal to 50% of the tread pattern height (Hs), and comprising a first axially outer main circumferential cut and a second axially outer main circumferential cut (52, 54) arranged axially on both sides of a midplane (M) of the tire (10), the first axially outer main circumferential cut and the second axially outer main circumferential cut (52, 54) being the axially outermost main circumferential cuts of the tread (14), - a first axial side portion (P1) which is axially arranged outside the first axially outer main circumferential cutout (52) and extends axially from a first axial edge (41) of the tread surface (38) to an axially outer edge (43) of the first axially outer main circumferential cutout (52), a second axial side portion (P2) arranged axially outside the second axially outer main circumferential cutout (54) and extending axially from the second axial edge (42) of the tread surface (38) to the axially outer edge (44) of the second axially outer main circumferential cutout (54), At least one of the first axial side portion and the second axial side portion (P1, P2) includes an axial portion (P11, P21), the axial width (Li1, Li2) of the axial portion (P11, P21) is equal to 50% of the axial width (L1, L2) of at least one of the first axial side portion and the second axial side portion (P1, P2), and extends axially outward from the axial outer edge (43, 44) of the first axial outer main circumferential cutout or the second axial outer main circumferential cutout (52, 54), at least one of the first axial side portion and the second axial side portion (P1, P2) extends from the axial outer edge (43, 44) of the first axial outer main circumferential cutout or the second axial outer main circumferential cutout (52, 54), Characterized in that the tread (14) comprises at least a transverse cutout (80, 90) formed at least partially in at least one of the first axial side portion and the second axial side portion (P1, P2), Each transverse cutout (80, 90) comprises an axially inner portion (86, 96) extending in an axial portion (P11, P21) of at least one of the first and second axial side portions (P1, P2), The transverse cutouts (80, 90) formed in at least one of the first and second axial side portions (P1, P2) include at least one diffuser pair, the diffuser pair including a first and second transverse cutouts (801, 802, 811, 812), each axial inner portion (861, 862, 871, 872) of the first and second transverse cutouts (801, 802, 811, 812) of the diffuser pair having a width La1, La2, respectively, satisfying: -1≤La1 / La2≤2.5, where La1>1.5mm and La2>1.5mm, -1≤La1 / La2≤3.0, where La1>1.5mm and La2≤1.5mm, -1≤La1 / La2≤4.0, where La1≤1.5mm, Each axially inner portion (861, 862, 871, 872) of the first and second transverse cutouts (801, 802, 811, 812) of the or each diffuse sound pair extends in a general direction forming a first non-zero average angle and a second non-zero average angle (F1, F2, F11, F12) with the axial direction (Y), respectively, The first average angle (F1, F11) of the axially inner portion (861, 871) of the first transverse cutout (801, 811) of the or each diffuse sound pair is different from the second average angle (F2, F12) of the axially inner portion (862, 872) of the second transverse cutout (802, 812) of the diffuse sound pair.

2. Tyre (10) according to the preceding claim, wherein: The first non-zero average angle and the second non-zero average angle (F1, F2, F11, F12) of the axial inner part (861, 862, 871, 872) of the first transverse cutout and the second transverse cutout (801, 802, 811, 812) of the diffuse sound pair or each diffuse sound pair are respectively less than or equal to 50°, preferably less than or equal to 40°, and more preferably in the range of 5° to 40°.

3. Tyre (10) according to any one of the preceding claims, wherein: The absolute value of the difference between the first average angle (F1, F11) and the second average angle (F2, F12) of the or each diffuse sound pair is less than or equal to 40°, preferably less than or equal to 30°.

4. Tyre (10) according to any one of the preceding claims, wherein: The absolute value of the difference between the first average angle (F1, F11) and the second average angle (F2, F12) of the or each diffuse sound pair is greater than or equal to 5°, preferably greater than or equal to 10°.

5. Tyre (10) according to any one of the preceding claims, wherein: The first and second average angles (F1, F2, F11, F12) are equal to values ​​selected from a list of at least first and second values ​​(FA, FB, FC) different from each other: - at least 25%, preferably at least 50%, more preferably at least 75% of the axially inner portions (86, 96) of at least one of the first and second axial side portions (P1, P2) of the transverse cutouts (80, 90) have an average angle equal to one of at least a first and a second value (FA, FB, FC) different from each other, - the width La of each axially inner portion (86, 96) of each transverse cutout (80, 90) having an average angle equal to one of at least a first value and a second value (FA, FB, FC) different from each other satisfies: ○ 1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, wherein Lamax>1.5mm and La>1.5mm, ○ 1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, wherein Lamax>1.5mm and La≤1.5mm, ○ 1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm, wherein Lamax is the maximum value of the width of the axially inner portion (86, 96) of the transverse cutout (80, 90) for which the average angle is equal to at least 25%, preferably at least 50%, and more preferably at least 75% of one of at least a first value and a second value (FA, FB, FC) different from each other.

6. Tyre (10) according to the preceding claim, wherein: - at least 15%, preferably at least 25%, of the axially inner portions (86, 96) of at least one of the first and second axial side portions (P1, P2), respectively, have an average angle equal to a first value (FA), and - at least 15%, preferably at least 25%, of the axially inner portions (86, 96) of at least one of the first and second axial side portions (P1, P2), respectively, have an average angle equal to a second value (FB).

7. Tyre (10) according to any one of the preceding claims, wherein: The transverse cutouts (80, 90) formed at least partially in at least one of the first and second axial side portions (P1, P2) include at least one acoustically diffuse three-piece set having a first transverse cutout, a second transverse cutout, and a third transverse cutout (801, 802, 811, 812), The first, second and third transverse cuts (801, 802, 811, 812) of the or each sound-diffusing three-piece set each include an axially inner portion (861, 862, 871, 872) extending in an axial portion of at least one of the first and second axial side portions (P1, P2), Each axial inner portion (861, 862, 871, 872) of the first transverse cutout, the second transverse cutout and the third transverse cutout (801, 802, 811, 812) of the sound-diffusing three-piece set has a width La1≥La2≥La3, respectively, satisfying: -1≤La1 / La3≤2.5, preferably 1≤La1 / La3≤2.1, where La1>1.5mm and La3>1.5mm, -1≤La1 / La3≤3.0, preferably 1≤La1 / La3≤2.4, where La1>1.5mm and La3≤1.5mm, -1≤La1 / La3≤4.0, preferably 1≤La1 / La3≤3.2, wherein La1≤1.5mm, Each axially inner portion (861, 862, 871, 872) of the first transverse cutout, the second transverse cutout and the third transverse cutout (801, 802, 811, 812) of the or each sound-diffusing three-piece set respectively extends in a general direction forming a first non-zero average angle, a second non-zero average angle and a third non-zero average angle (F1, F2, F11, F12) with the axial direction (Y), The first average angle, second average angle and third average angle (F1, F2, F11, F12) of the axial inner part (861, 862, 871, 872) of the first transverse cut, second transverse cut and third transverse cut (801, 802, 811, 812) of the sound-diffusing three-piece set or each sound-diffusing three-piece set are different from each other.

8. Tyre (10) according to the preceding claim, wherein: The first, second and third average angles (F1, F2, F11, F12) are equal to values ​​selected from a list of at least first, second and third values ​​(FA, FB, FC) that are two-by-two different: - at least 25%, preferably at least 50%, more preferably at least 75% of the axially inner portions (86, 96) of at least one of the first and second axial side portions (P1, P2) have an average angle equal to one of at least a first, a second and a third value (FA, FB, FC) different from each other, - the width La of each axially inner portion (86, 96) of each transverse cutout (80, 90) having an average angle equal to at least one of first, second and third values ​​(FA, FB, FC) different from each other satisfies: ○ 1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, wherein Lamax>1.5mm and La>1.5mm, ○ 1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, wherein Lamax>1.5mm and La≤1.5mm, ○ 1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm, wherein Lamax is the maximum value of the width of the axial inner portion (86, 96) of the transverse cutout (80, 90) having an average angle equal to at least 25%, preferably at least 50%, and more preferably at least 75% of one of at least first, second and third values ​​(FA, FB, FC) that are two different from each other.

9. Tyre (10) according to the preceding claim, wherein: - at least 15%, preferably at least 25%, of the axially inner portions (86, 96) of at least one of the first and second axial side portions (P1, P2), respectively, have an average angle equal to a first value (FA), - at least 15%, preferably at least 25%, of the axially inner portions (86, 96) of at least one of the first and second axial side portions (P1, P2), respectively, have an average angle equal to a second value (FB), and - at least 15%, preferably at least 25% of the axially inner portions (86, 96) of the transverse cutouts (80, 90) of at least one of the first and second axial side portions (P1, P2), respectively, have an average angle equal to a third value (FC).

10. Tyre (10) according to any one of the preceding claims, wherein: The first and second transverse cutouts (801, 811, 812) of the or each sound diffusing pair are adjacent in the circumferential direction.

11. The tire (10) according to claim 10, wherein: The absolute value of the difference between the first average angle (F1, F11, F12) and the second average angle (F1, F11, F12) of the circumferentially adjacent first and second transverse cuts (801, 811, 812) of the diffuse sound pair or each diffuse sound pair is less than or equal to 20°.

12. The tire (10) according to claim 10 or 11, wherein: The absolute value of the difference between the first average angle (F1, F11, F12) and the second average angle (F1, F11, F12) of the circumferentially adjacent first and second transverse cuts (801, 811, 812) of a diffuse sound pair or each diffuse sound pair is greater than or equal to 5°, preferably greater than or equal to 10°.

13. Tyre (10) according to any one of the preceding claims, wherein: The tread (14) includes N circumferentially adjacent transverse cuts (80, 90), wherein the N circumferentially adjacent transverse cuts (80, 90) form N pairs of circumferentially adjacent transverse cuts (80, 90) in a circumferential rotation direction (S) around the tire, and a width La of each axially inner portion (86, 96) of each of the N circumferentially adjacent transverse cuts (80, 90) satisfies: -1≤Lamax / La≤2.5, preferably 1≤Lamax / La≤2.1, where Lamax>1.5mm and La>1.5mm, -1≤Lamax / La≤3.0, preferably 1≤Lamax / La≤2.4, where Lamax>1.5mm and La≤1.5mm, -1≤Lamax / La≤4.0, preferably 1≤Lamax / La≤3.2, wherein Lamax≤1.5mm, wherein Lamax is the maximum value of the width of the axial inner portion (86, 96) of the transverse cutouts (80, 90) of N pairs of circumferentially adjacent transverse cutouts (80, 90), At least 25%, preferably at least 35%, of N to N circumferentially adjacent transverse cutouts (80, 90) have different average angles of their axially inner portions.

14. The tire (10) according to any one of the preceding claims, comprising a plurality of diffuse pairs, each diffuse pair comprising a first and a second transverse incision (80, 90) circumferentially adjacent in a circumferential rotation direction (S) around the tire, The absolute value of the difference between the first average angle and the second average angle of the circumferentially adjacent first and second transverse cuts (80, 90) of at least 25%, preferably at least 50%, and more preferably at least 75% of the sound-scattering pairs is less than or equal to 20°.

15. The tire (10) according to any one of the preceding claims, comprising a plurality of diffuse pairs, each diffuse pair comprising a first and a second transverse incision (80, 90) circumferentially adjacent in a circumferential rotation direction (S) around the tire, The absolute value of the difference between the first average angle and the second average angle of the circumferentially adjacent first transverse cuts (80, 90) of at least 25%, preferably at least 50%, and more preferably at least 75% of the sound-scattering pairs is greater than or equal to 5°, preferably greater than or equal to 10°.

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