Vehicle pneumatic tire

Abstract

A vehicle pneumatic tire having a tread with at least one tread rib (3) delimited on each side by a circumferential groove (4, 5), which tread rib is divided into rib blocks (3a) successive in the circumferential direction, wherein in rib blocks (3a) adjacent to one another at least one, in particular exactly one, microgroove group (Gl, G2, G3) is formed, which microgroove group consists of microgrooves (8, 8') with a width of 0.4 mm to 2.0 mm, which microgrooves run parallel at an angle of at most 10° in the circumferential direction, and which microgroove group is delimited in the circumferential direction by two boundary lines (1) running in the axial direction, which boundary lines extend through the microgroove ends that are farthest apart from one another in the circumferential direction. The tread rib (3) is divided into rib blocks (3a) by incisions (7) that merge into the circumferential grooves (4, 5); a microgroove group (Gl, G2, G3) is formed by at least two rib blocks (3a) successive in the front-rear direction; the spacing (aF) between microgroove regions (F) successive in the circumferential direction is 25% to 120% of the average circumference of the rib blocks (3a); the rib blocks (3a) are free of microgrooves in the regions between local microgroove regions (F).

Description

Technical Field

[0001] The present invention relates to a vehicle pneumatic tire having: a tread having at least one tread rib defined on each side by a circumferential groove, the tread rib being divided into successive rib blocks in the circumferential direction, wherein at least one, particularly exactly one microgroove group is formed in each adjacent rib block, the microgroove group consisting of at least three microgrooves with a width of 0.4 mm to 2.0 mm, the microgrooves extending in a straight line, parallel to each other, side by side and at an angle of up to 10° with respect to the circumferential direction in a top view, and the microgroove group being defined in the circumferential direction by two boundary lines extending in the axial direction, the boundary lines extending through the ends of the microgrooves that are furthest apart in the circumferential direction. Background Technology

[0002] Such pneumatic tires for vehicles are known, for example, from DE 10 2017 215 188 A1. In one of the described embodiments, the tire has a tread with a central tread rib having ribs, in which each rib has a centrally formed microgroove group consisting of three microgrooves of a slit-like design extending in the circumferential direction, wherein the microgroove group is symmetrical about the central plane extending in the circumferential direction. The width of the microgroove is 0.4 mm to 1.4 mm, the depth is at least 2.5 mm and at most 90% of the tread depth, and the length is 4.0 mm to 40.0 mm. The spacing between adjacent microgrooves within the microgroove group, measured perpendicular to the centerline of the microgroove, is 3.0 mm to 12.0 mm. The microgrooves grouped in this manner are intended to have a beneficial effect on handling performance, especially on wet roads, while taking into account minimizing rolling noise.

[0003] Therefore, it is known to design microgrooves in the convex tread patterns of tires to improve water drainage performance. However, because these microgrooves reduce the net contact area between the tread and the road surface, they negatively impact handling performance on dry roads, creating a conflict between improving handling performance on wet roads and improving handling performance on dry roads. Handling performance on dry roads includes, for example, the tire's ability to effectively transfer lateral forces to the ground. Summary of the Invention

[0004] Therefore, the objective of this invention is to resolve the conflict between improving handling performance on wet roads and improving handling performance on dry roads with the highest possible level of technology in vehicle pneumatic tires of the type described at the outset.

[0005] According to the present invention, the proposed objective is achieved by the following method: tread ribs are divided into rib blocks by cuts that converge into circumferential grooves and extend parallel to each other in a top view, the maximum depth of the cuts being at least the tread depth reduced by 2.5 mm and the width of the cuts being 0.4 mm to 1.2 mm, wherein microgroove groups formed by at least two consecutive rib blocks constitute elongated, localized microgroove regions in the circumferential direction, wherein consecutive microgroove regions in the circumferential direction—referring to the closest boundary lines of microgroove groups from different microgroove regions—are spaced apart from each other by a distance measured in the circumferential direction, the distance being 25% to 120% of the average circumference of the rib block, and wherein the rib blocks do not contain microgrooves in the regions between the localized microgroove regions.

[0006] The microgrooved regions extending across multiple ribs, as proposed in this invention, serve as surface drainage elements. When driving on wet surfaces, these surface drainage elements effectively absorb water from the outer surface of the ribs and, in particular, provide additional grip edges under lateral loads. A large net contact area between the tread and the ground is maintained through the non-microgrooved areas between the ribs, which contribute to good handling performance on dry surfaces. Especially when the vehicle's pneumatic tire rolls on the ground, the alternating contact between the microgrooved regions and the non-microgrooved areas of the ribs with the ground ensures a highly advantageous balance of handling performance on both dry and wet surfaces, and resolves the conflicting objectives at a higher level of technology compared to known methods.

[0007] According to a preferred embodiment, the circumferential spacing between successive microgroove regions—referring to the closest boundary lines of microgroove groups from different microgroove regions—measured in the circumferential direction, is 30% to 70%, particularly 40% to 60%, of the average circumference of the rib. This facilitates a particularly good balance between handling performance on dry and wet surfaces.

[0008] According to another preferred embodiment, each microgroove region—referring to the boundary lines of the two edge sides of its microgroove group—has a length measured in the circumferential direction, which is 170% to 270%, particularly up to 230%, preferably up to 200% of the average perimeter calculated based on the perimeter of the rib where the microgroove region is located. The microgroove regions thus implemented exhibit high water absorption capacity, which is beneficial to handling performance on wet pavements.

[0009] Other preferred, combinable implementations relate to the length of the microgroove region.

[0010] According to a preferred first embodiment in this regard, there are microgroove regions each having at least two microgroove groups, wherein each microgroove group has a length measured in the circumferential direction between its boundary lines, and the length of one microgroove group differs from the length of the other microgroove group. This also facilitates a balance between handling performance on dry and wet road surfaces.

[0011] According to a preferred second embodiment in this respect, there are microgroove regions, that is, these microgroove regions have at least one, especially exactly one group of microgrooves, the length of which, measured in the circumferential direction, between its boundary lines is at least 80%, especially at least 90%, of the circumference of the associated rib.

[0012] According to a preferred third embodiment in this respect, there are microgroove regions, that is, these microgroove regions have at least one, especially exactly one group of microgrooves, the length of which, measured in the circumferential direction, between its boundary lines is 40% to 60%, especially 45% to 55% of the circumference of the associated rib.

[0013] According to the preferred fourth embodiment in this respect, there are microgroove regions, that is, these microgroove regions have at least one, especially exactly one group of microgrooves, the length of which, measured in the circumferential direction, between its boundary lines is 15% to 35%, especially 20% to 30%, of the circumference of the associated rib.

[0014] In particular, which is beneficial to handling performance on wet roads, there is a microgroove area consisting of microgroove groups formed by at least three, especially exactly three consecutive ribs.

[0015] In particular, the microgroove group has up to seven microgrooves.

[0016] According to another preferred embodiment, there is a microgroove region in which the microgrooves of all microgroove groups extend flush with each other in a top view.

[0017] Furthermore, it is advantageous to have at least one, and particularly exactly one, tread rib extending laterally on the equatorial plane of the tire, which has slits and microgrooves, wherein the microgrooves are located only in the rib half facing the nearest tread shoulder. Such a tread rib is particularly advantageous for water drainage under the influence of lateral forces acting in the axial direction.

[0018] According to another preferred embodiment, a microgroove region is provided such that, viewed in a top view, the microgrooves of all microgroove groups extend in the circumferential direction within the microgroove region, wherein the microgrooves of the microgroove groups located within each microgroove region preferably extend symmetrically about a common intermediate plane extending in both the radial and circumferential directions. Since the force acting primarily in the circumferential direction is experienced during driving, microgrooves extending in the circumferential direction (similar to circumferential grooves) have an advantage in terms of water drainage. The symmetrical implementation allows for uniform water drainage from the tread ribs.

[0019] Furthermore, it is advantageous to have a microgroove assembly consisting of relatively long, edge-side microgrooves and relatively short, intermediate microgrooves, wherein, referring to the end of a microgroove, the edge-side microgrooves protrude from the corresponding nearest intermediate microgroove at least at one end, particularly at each end, with a protrusion of 2.0 mm to 10.0 mm, particularly 4.0 mm to 7.0 mm, measured in the direction of extension of the microgroove. This microgroove assembly can be molded particularly well after vulcanization because the protrusion allows for the arrangement of positionable ventilation elements, particularly ventilation valves, that are beneficial for ventilation of the molded part in the vulcanizing mold.

[0020] According to another preferred embodiment, there are microgrooved regions, each with a microgrooved frame, wherein the microgrooved frame:

[0021] ○ Either surround all microgroove groups belonging to the microgroove region,

[0022] ○ Either it surrounds all microgroove groups belonging to the microgroove region and extends to one of the circumferential grooves at both ends, where

[0023] The microgrooves from the microgroove group terminate at the microgroove frame, and the microgroove frame is composed of multiple microgrooves. These microgrooves either converge into the cut or terminate in front of these cuts at a maximum spacing of 2.0 mm measured in the circumferential direction, and the microgroove frame is interrupted only in the region of the cut.

[0024] The microgrooved frame complements the aforementioned surface drainage element, which is composed of microgrooves, and provides a superstructure to the surface drainage element. This structure is particularly advantageous in terms of drainage performance due to the microgrooves from the microgrooves terminating in the microgrooved frame (i.e., flowing into the microgrooved frame).

[0025] Furthermore, it is preferable to have microgroove groups in which at least one ridge is formed in each microgroove, traversing the microgroove and not protruding radially from the outer surface of the rib. This ridge has a height and width of 0.2 mm to 0.4 mm in the radial direction. This ridge stabilizes the adjacent surface areas of the microgroove and the rib, and is therefore particularly beneficial for handling performance on dry surfaces. Attached Figure Description

[0026] Other features, advantages, and details of the invention will now be described in detail with the aid of the accompanying drawings, which schematically illustrate embodiments of the invention. In the drawings:

[0027] Figure 1 A simplified top view of a circumferential section of the tread of a vehicle pneumatic tire with an embodiment of the present invention, unfolded into a planar shape.

[0028] Figure 2 Show Figure 1 A magnified top view of detail Z2 in the image.

[0029] Figure 3 Show another Figure 1 A magnified top view of the Z3 in detail.

[0030] Figure 4 Show along Figure 3 The cross section of line IV-IV in the middle, and

[0031] Figure 5 It shows along Figure 3 The cross section of line VV in the middle.

[0032] List of reference numerals

[0033] 1...................Central tire ribs

[0034] 2...................The middle tire rib

[0035] 3...................The middle tire rib

[0036] 3a..................ribs

[0037] 4...................Circular grooves

[0038] 5...................Circular grooves on the shoulder side of the tire 6...................Outer surface of the rib

[0039] 7...................Incision

[0040] 8, 8'................ Microgrooves

[0041] 9a, 9b, 9c, 9d, 9e, 9f... Microgrooves

[0042] 10..................Elevation

[0043] AA.................line (tire equatorial plane)

[0044] a1, a2, a3, a F ...........spacing

[0045] b E b MR b PR ............width

[0046] B MR B UR ...............width

[0047] l...................boundary line

[0048] l G , l F ................length

[0049] l RB ..................perimeter

[0050] Δl.................protrusion

[0051] E...................Middle plane

[0052] F...................Microgroove area

[0053] FA..................Outside of the vehicle

[0054] FI..................Inside the vehicle

[0055] G1, G2, G3... Microgroove group

[0056] H1, H2...rib half

[0057] hE ...................high

[0058] m MR ..................Microgroove center line

[0059] m PR ..................rib center line

[0060] t MR T MR ...............depth

[0061] R...................Microgrooved frame

[0062] Z2, Z3...details

[0063] α, β, γ, δ............angle Detailed Implementation

[0064] The pneumatic tires of the present invention are tires for multi-track motor vehicles and preferably radial tires for passenger vehicles, trucks or light trucks (light-duty vehicles with a permissible gross weight ≤ 7.5t).

[0065] Figure 1 This is a top view of the central tread area belonging to the pneumatic tire of a vehicle. The tire equatorial surface is marked by line AA.

[0066] The tread has a central tread rib 1, an intermediate tread rib 2, and an intermediate tread rib 3, which are "divided" in half by the tire's equatorial plane. The central tread rib 1 and the intermediate tread ribs 2 and 3 are separated by circumferential grooves 4, and the intermediate tread ribs 2 and 3 are defined on the outer side of the tread by circumferential grooves 5 on the shoulder side (only a portion of the circumferential grooves is visible). Connected to the circumferential grooves 5 on the shoulder side are the tread ribs on the shoulder side, which are designed in a particularly known manner.

[0067] In the illustrated embodiment, the circumferential grooves 4 and 5 extend in a straight line in the top view and are configured with a corresponding tread depth (not shown) in the radial direction. This tread depth is typically 6.5 mm to 13.0 mm for the preferred tire type, and these circumferential grooves have a width B in the axial direction at the tread periphery. UR For example, the thickness ranges from 6.0mm to 13.0mm.

[0068] The central tread rib 1 and the intermediate tread rib 2 are shown in a simplified (unstructured) manner and can be provided with cuts and / or grooves, particularly implemented in a known manner. As further elaborated, the intermediate tread rib 3 is provided with a number of microgrooved areas F successively in the circumferential direction, such that the tread has an asymmetrical configuration about the tire equatorial plane (line AA), wherein the vehicle pneumatic tire is preferably fitted on a vehicle such as a PKW, in such a way that the intermediate tread rib 3 faces outward of the vehicle (indicated by the letter "FA") and the intermediate tread rib 2 faces inward of the vehicle (indicated by the letter "FI").

[0069] Tread ribs 1, 2, and 3 each have an outer surface 6 located around the tread periphery, and a width b measured in the axial direction on this outer surface. PR and the centerline m of the ribs that surround in the circumferential direction PR The center line of this rib refers to the width b of tread ribs 1, 2, and 3. PR In the top view, it is divided into two rib halves. The corresponding rib centerline m PR Divide the middle tread ribs 2 and 3 into two halves: H1, which faces the closest tread shoulder, and H2, which faces the tire equatorial plane (line AA).

[0070] The central tread rib 3 has multiple transverse cuts 7 on its circumference, giving it a rib-like structure 3a. The cuts 7 extend parallel to each other, in a straight line, and at an angle α of 0° to 20°, particularly 5° to 15°, with respect to the axial direction in the top view. They each have a constant width of 0.4 mm to 1.2 mm, and their maximum depth at their deepest point in the radial direction corresponds at least to, and at most to, the tread depth after a reduction of 2.5 mm. The ribs 3a each have a circumference l measured on the outer surface 6 of the rib. RB , where the perimeter l RB In particular, it differs slightly in the known manner (segment length variation).

[0071] Viewed from the top view, the aforementioned microgroove regions F extend elongatedly in the circumferential direction and extend past three ribs 3a that are sequentially arranged in the circumferential direction. In this embodiment, each microgroove region F extends past its own three ribs 3a. Therefore, there are no ribs 3a where portions of two directly sequential microgroove regions F are located in the circumferential direction. Furthermore, it is preferred that each rib 3a has a portion of a microgroove region F formed on it. In the region between the microgroove regions F, the ribs 3a do not contain microgrooves. Within the scope of this invention, "microgroove" is understood as an elongated groove in the top view, with a depth and width of 0.4 mm to 2.0 mm, respectively.

[0072] The following section will illustrate another design scheme for the microgroove region F based on the individual microgroove region F.

[0073] according to Figure 2 The microgroove region F is composed of three microgroove groups G1, G2, and G3 located in the rib half H1 facing the tread and shoulder, and a microgroove frame R. In the top view, the microgroove frame surrounds all microgroove groups G1, G2, and G3, extends in the two rib half H1 and H2, and together defines the microgroove region F.

[0074] Microgroove groups G1, G2, and G3 are located in successive rib blocks 3a, with microgroove group G1 located in... Figure 2 In the uppermost rib 3a, the microgroove group G2 is located in the middle rib 3a and the microgroove group G3 is located in Figure 2 In the lowest rib 3a, each microgroove group G1, G2, G3 consists of four microgrooves 8, 8' that extend linearly in the top view and axially side-by-side in the circumferential direction and entirely within the rib 3 (therefore not merging into the cutout 7)—that is, two longer edge-side microgrooves 8' and two shorter, intermediate microgrooves 8 extending in the region between the edge-side microgrooves. In the illustrated embodiment, the microgrooves 8, 8' in the microgroove groups G1, G2, G3 are flush with each other in the top view, such that the microgrooves 8, 8' from different microgroove groups G1, G2, G3 extend toward each other along their extension lines in the top view.

[0075] Within each microgroove group G1, G2, G3, microgrooves 8, 8' are generally symmetrically formed about a common intermediate plane E extending in both radial and circumferential directions in the region between the intermediate microgrooves 8, wherein the intermediate plane E is perpendicular to the rib centerline m. PR The axial distance a1 is the width b. PR 15% to 30%, and especially up to 25%.

[0076] Microgrooves 8 and 8' each have a microgrooves centerline m MR ( Figure 3 The depth t measured at its deepest point in the radial direction. MR ( Figure 4 Furthermore, the outer surface 6 of the rib has a line m perpendicular to the center line of the corresponding microgroove in the top view. MR ( Figure 3 )Measured width b MR ( Figure 3 , Figure 4 Depth t MR and width b MRThe diameters are 0.4 mm to 2.0 mm, and particularly 0.5 mm to 1.5 mm. Furthermore, the microgrooves G1, G2, and G3 include adjacent microgrooves 8 and 8' – with reference to their microgroove center lines m. MR —The distance between them is perpendicular to the center line of the microgrooves (m) MR The measured, especially consistent, mutual spacing a2 ( Figure 3 (b) is the width MR 200% to 400%, especially 270% to 300%.

[0077] In microgroove groups G1 and G2, the longer edge-side microgrooves 8' protrude from the adjacent, shorter, middle microgrooves 8—referring to the microgroove centerline m. MR The end portion—with a protrusion Δl of 2.0 mm to 10.0 mm, particularly 4.0 mm to 7.0 mm, in two circumferential directions (refer to...) Figure 3 The protrusion Δl in microgroove group G3 exists only at the circumferential end of microgroove group G3 facing microgroove group G2. (Refer to the microgroove centerline m) MR The microgrooves 8' on the edge side terminate at a spacing a3 of at least 1.0 mm measured in the circumferential direction in front of the cut 7 that traverses the associated microgrooved region F in the top view.

[0078] exist Figure 2 In the diagram, each microgroove group G1, G2, and G3 is marked with a boundary line l that defines the microgroove group in one circumferential direction and another boundary line l that defines the microgroove group in another circumferential direction. Viewed from the top, the boundary line l extends axially and passes through the microgroove centerline m. MR The ends that are furthest apart from each other in the circumferential direction within the corresponding microgroove groups G1, G2, and G3 (corresponding to the microgroove ends), wherein these ends may belong to microgrooves 8' on the same edge side (microgroove groups G1 and G3) or to microgrooves 8' on different edge sides (microgroove groups G3) (see the exact orientation of boundary line l). Figure 3 Each microgroove group G1, G2, G3 has a length l measured in the circumferential direction between its associated boundary lines l. G The length is: in the microgroove group G2, it is the perimeter of the associated rib 3a. RB At least 80%, especially at least 90%; in the microgroove group G1, the perimeter of the associated rib 3a is l RB (not in) Figure 2 (as indicated) 40% to 60%, especially 45% to 55%; and in the microgroove group G3, the perimeter of the associated rib 3a is l RB (not in) Figure 2 (As indicated by the bid) 15% to 35%, especially 20% to 30%.

[0079] Referring to the edge sides of microgroove groups G1, G2, and G3, i.e., the boundary lines l that are furthest apart from each other, the microgroove region F has a length l measured in the circumferential direction. F This length matches the average perimeter of the three associated ribs 6. This average perimeter is the sum of the three perimeters of the three ribs 3a. RB The arithmetic mean of the length l. F For the three perimeters l of the three related ribs 6 RB The calculated average perimeter is 170% to 270%, particularly up to 230%, preferably up to 200%.

[0080] In the circumferential direction, the successive microgroove regions F are spaced apart by a distance a related to the nearest boundary line l of microgroove groups G1 and G3. F ( Figure 1 This spacing matches the average perimeter of all ribs 3a. This average perimeter is the total perimeter of all ribs 3a. RB The arithmetic mean of the interval a. F Based on the perimeter l of all ribs 6 RB The calculated average perimeter is 25% to 120%, particularly 30% to 70%, and preferably 40% to 60%.

[0081] like Figure 3 Combination Figure 5 As shown, in the microgroove group G2, small ridges 10 are formed in the middle regions of microgrooves 8 and 8', respectively, which are horizontal planes that do not protrude from the outer surface 6 of the rib in the radial direction and traverse the microgrooves 8 and 8'. These ridges have a height h in the radial direction. E ( Figure 5 And at the center line of the microgroove m MR In the direction (refer to) Figure 3 The section line VV in the middle has a width b E ( Figure 5 ), where the height h E and width b E The thicknesses range from 0.2 mm to 0.4 mm.

[0082] according to Figure 2The aforementioned microgroove frame R surrounds all microgroove groups G1, G2, and G3 within the microgroove region F. In a top view, it clamps around the microgroove groups G1, G2, and G3 in a pincer-like manner, or when viewed circumferentially, it forms a transverse U-shape. It extends from its two ends to the circumferential grooves 5 on the tire shoulder side and is interrupted in the area of ​​the cut 7. In the illustrated embodiment, the microgroove frame R consists of six microgrooves 9a, 9b, 9c, 9d, 9e, and 9f extending linearly in a top view. These microgrooves each have a constant depth T in the radial direction. MR ( Figure 4 ) and constant width B MR , where depth T MR and width B MR The microgrooves range from 0.6 mm to 2.0 mm, and are particularly at most 1.5 mm. Microgrooves 9a are located in tread blocks 3a with microgrooves group G1, and microgrooves 9b are located in tread blocks 3a with microgrooves group G3. Microgrooves 9a and 9b merge into the circumferential grooves 5 on the shoulder side, and in the top view, are inclined in the same direction relative to the axial direction. They extend only or almost only in the rib half H1 towards the nearest tread shoulder, and at angles β (microgrooves 9a) and γ (microgrooves 9b) with respect to the axial direction. Referring to the microgrooves centerline (not shown), these microgrooves terminate at the rib centerline m with a spacing (not shown) measured in the axial direction of up to 2.0 mm. PR Front or rear. Microgrooves 9c connect with microgrooves 9b, extending only or almost exclusively in the rib half H2 facing the tire equator and at an angle δ of up to 15° with the circumferential direction, generally traversing the rib 3a with microgrooves group G2, interrupted by two corresponding cuts 7, and having two shorter end segments in the two ribs 3a with microgrooves group G1 or G3. Microgrooves 9d, 9e, and 9f connect with each other, generally extending in a hook or J-shape, wherein microgrooves 9d connect with microgrooves 9a and traverse the rib centerline m. PR Furthermore, the microgrooves 9f extend to the microgrooves 9c.

[0083] The present invention is not limited to the described embodiments.

[0084] The microgroove area extends over at least two ribs. Each microgroove group has at least three, and particularly, a maximum of seven, microgrooves, and may be partially located in one half of a rib and partially in another half. In a top view, the microgrooves can extend at an angle of up to 10° with the circumferential direction. The microgroove frame is optional, allowing the microgroove area to consist solely of microgroove groups. Multiple microgroove groups, particularly two, can be formed on each rib. The cuts in the tread ribs can extend at least segmentally in a wavy or zigzag pattern in a top view.

Claims

1. A vehicle pneumatic tire, the vehicle pneumatic tire having: a tread having at least one tread rib (3) defined on each side by a circumferential groove (4, 5), the tread rib being divided into successive rib blocks (3a) in the circumferential direction, wherein at least one microgroove group (G1, G2, G3) is formed in each adjacent rib block (3a), the microgroove group being defined by a width (b MR The microgrooves consist of at least three microgrooves (8, 8') ranging from 0.4 mm to 2.0 mm in diameter. In a top view, the microgrooves extend linearly, parallel to each other, side-by-side, and at an angle of up to 10° to the circumferential direction. The microgroove group is defined in the circumferential direction by two boundary lines (l) extending in the axial direction, which extend through the ends of the microgrooves furthest apart in the circumferential direction. Its features are, The tread ribs (3) are divided into rib blocks (3a) by cuts (7) that converge into the circumferential grooves (4, 5) and extend parallel to each other in the top view. The maximum depth of the cuts is at least the tread depth reduced by 2.5 mm, and the width of the cuts is 0.4 mm to 1.2 mm. Each microgroove group (G1, G2, G3) formed by at least two successive ribs (3a) constitutes a narrow, localized microgroove region (F) in the circumferential direction, wherein the successive microgroove regions (F) in the circumferential direction are separated by a distance (a) between each other, defined by the closest boundary line (l) of the microgroove groups (G1, G2, G3) from different microgroove regions (F), and the distance between them is determined in the circumferential direction. F The spacing is 25% to 120% of the average circumference of the rib (3a), and the rib (3a) does not contain microgrooves in the region between the local microgrooved regions (F), wherein there are microgrooved regions (F) with at least two microgrooved groups (G1, G2, G3), wherein the microgrooved groups (G1, G2, G3) each have a length (l) measured in the circumferential direction between their boundary lines (l). G ), and the length (l) of one of the microgroove groups (G1, G2, G3) G The length (l) of another microgroove group (G1, G2, G3) G )different.

2. The vehicle pneumatic tire according to claim 1, characterized in that, Each of the adjacent ribs (3a) has exactly one microgroove group (G1, G2, G3).

3. The vehicle pneumatic tire according to claim 1, characterized in that, The circumferential spacing (a) between successive microgroove regions (F) – the closest boundary lines (l) of the microgroove groups (G1, G2, G3) from different microgroove regions (F) – is measured in the circumferential direction. F The circumference of the rib (3a) is 30% to 70% of the average circumference of the rib (3a).

4. The vehicle pneumatic tire according to claim 3, characterized in that, The circumferential spacing (a) between successive microgroove regions (F) – the closest boundary lines (l) of the microgroove groups (G1, G2, G3) from different microgroove regions (F) – is measured in the circumferential direction. F The circumference of the rib (3a) is 40% to 60% of the average circumference of the rib (3a).

5. The vehicle pneumatic tire according to claim 1, characterized in that, Each microgroove region (F) – with reference to the boundary lines (l) on the two edge sides of its microgroove group (G1, G2, G3) – has a length (l) measured in the circumferential direction. F The length is the perimeter (l) of the rib where the microgroove region (F) is located. RB The calculated average perimeter is 170% to 270%.

6. The vehicle pneumatic tire according to claim 5, characterized in that, The length (l) of each microgroove region (F) is measured in the circumferential direction with reference to the boundary lines (l) on the two edge sides of its microgroove group (G1, G2, G3). F ) is the perimeter (l) of the rib where the microgroove region (F) is located. RB The calculated average perimeter is up to 230%.

7. The vehicle pneumatic tire according to claim 5, characterized in that, The length (l) of each microgroove region (F) is measured in the circumferential direction with reference to the boundary lines (l) on the two edge sides of its microgroove group (G1, G2, G3). F ) is the perimeter (l) of the rib where the microgroove region (F) is located. RB The calculated average perimeter can be as high as 200%.

8. The vehicle pneumatic tire according to claim 1, characterized in that, There exists a microgroove region (F), wherein the microgroove region has at least one microgroove group (G2), and the microgroove group has a length (l) measured in the circumferential direction between its boundary lines (l). G ) is the perimeter (l) of the relevant rib (3a). RB At least 80% of ().

9. The vehicle pneumatic tire according to claim 8, characterized in that, There exists a microgroove region (F), wherein the microgroove region has at least one microgroove group (G2), and the microgroove group has a length (l) measured in the circumferential direction between its boundary lines (l). G ) is the perimeter (l) of the relevant rib (3a). RB At least 90% of ().

10. The vehicle pneumatic tire according to claim 8 or 9, characterized in that, The microgroove region has exactly one microgroove group (G2).

11. The vehicle pneumatic tire according to claim 1, characterized in that, There exists a microgroove region (F), wherein the microgroove region has at least one group of microgrooves (G1), and the group of microgrooves has a length (l) measured in the circumferential direction between its boundary lines (l). G ) is the perimeter (l) of the relevant rib (3a). RB 40% to 60%.

12. The vehicle pneumatic tire according to claim 11, characterized in that, There exists a microgroove region (F), wherein the microgroove region has at least one group of microgrooves (G1), and the group of microgrooves has a length (l) measured in the circumferential direction between its boundary lines (l). G ) is the perimeter (l) of the relevant rib (3a). RB 45% to 55%.

13. The vehicle pneumatic tire according to claim 11 or 12, characterized in that, The microgroove region has exactly one microgroove group (G1).

14. The vehicle pneumatic tire according to claim 1, characterized in that, There exists a microgroove region (F), wherein the microgroove region has at least one microgroove group (G3), and the microgroove group has a length (l) measured in the circumferential direction between its boundary lines (l). G ) is the perimeter (l) of the relevant rib (3a). RB 15% to 35%.

15. The vehicle pneumatic tire according to claim 14, characterized in that, There exists a microgroove region (F), wherein the microgroove region has at least one microgroove group (G3), and the microgroove group has a length (l) measured in the circumferential direction between its boundary lines (l). G ) is the perimeter (l) of the relevant rib (3a). RB 20% to 30%.

16. The vehicle pneumatic tire according to claim 14 or 15, characterized in that, The microgroove region has exactly one microgroove group (G3).

17. The vehicle pneumatic tire according to claim 1, characterized in that, There is a microgroove region (F), that is, the microgroove region is composed of microgroove groups (G1, G2, G3) formed by at least three successive ribs (3a).

18. The vehicle pneumatic tire according to claim 17, characterized in that, There is a microgroove region (F) that is composed of microgroove groups (G1, G2, G3) formed by exactly three consecutive ribs (3a).

19. The vehicle pneumatic tire according to claim 1, characterized in that, The microgroove groups (G1, G2, G3) each have up to seven microgrooves.

20. The vehicle pneumatic tire according to claim 1, characterized in that, There is a microgroove region (F) in which the microgrooves (8, 8') of all microgroove groups (G1, G2, G3) extend flush with each other in a top view.

21. The vehicle pneumatic tire according to claim 1, characterized in that, The tire has at least one tread rib (3) extending laterally on the equatorial plane (line AA), the tread rib having the cut (7) and a microgroove area (F), wherein the microgroove area (F) is located only in the rib half (H1) facing the nearest tread shoulder.

22. The vehicle pneumatic tire according to claim 21, characterized in that, There is exactly one tread rib (3) extending laterally on the equatorial plane (line AA) of the tire.

23. The vehicle pneumatic tire according to claim 1, characterized in that, There is a microgroove region (F) such that, when viewed in a top view, the microgrooves (8, 8') of all microgroove groups (G1, G2, G3) in the microgroove region extend in the circumferential direction, wherein the microgrooves (8, 8') of the microgroove groups (G1, G2, G3) located within each microgroove region (F) extend symmetrically about a common intermediate plane (E) that unfolds by the radial direction and the circumferential direction.

24. The vehicle pneumatic tire according to claim 1, characterized in that, There is a group of microgrooves (G1, G2, G3) in which the group of microgrooves consists of a relatively long edge-side microgroove (8') and a relatively short intermediate microgroove (8) relative to the edge-side microgroove, wherein, with reference to the end of the microgroove, the edge-side microgroove (8') protrudes at least at one end from the corresponding nearest intermediate microgroove (8) with a protrusion (Δl) of 2.0 mm to 10.0 mm as measured in the extension direction of the microgroove (8, 8').

25. The vehicle pneumatic tire according to claim 24, characterized in that, There is a group of microgrooves (G1, G2, G3) in which the group of microgrooves consists of a relatively long edge-side microgroove (8') and a relatively short intermediate microgroove (8) relative to the edge-side microgroove, wherein, with reference to the end of the microgroove, the edge-side microgroove (8') protrudes at least at one end from the corresponding nearest intermediate microgroove (8) with a protrusion (Δl) of 4.0 mm to 7.0 mm as measured in the extension direction of the microgroove (8, 8').

26. The vehicle pneumatic tire according to claim 24 or 25, characterized in that, Referring to the end of the microgroove, the microgroove (8') on the edge side protrudes from the corresponding nearest middle microgroove (8) at each end.

27. The vehicle pneumatic tire according to claim 1, characterized in that, The system comprises microgrooved regions (F) each having a microgrooved frame (R), wherein the microgrooved frame (R) is: ○ Either surround all microgroove groups (G1, G2, G3) belonging to the microgroove region (F). ○ Either surround all microgroove groups (G1, G2, G3) belonging to the microgroove region (F) and extend to one of the circumferential grooves (5) at both ends, The microgrooves (8') from the edge side of the microgroove group (G1, G2, G3) terminate at the microgroove frame (R), and the microgroove frame (R) is composed of multiple microgrooves (9a, 9b, 9c, 9d, 9e, 9f), which converge into the cut (7) or terminate in front of the cut at a spacing of up to 2.0 mm measured in the circumferential direction, and wherein the microgroove frame (R) is interrupted only in the region of the cut (7).

28. The vehicle pneumatic tire according to claim 1, characterized in that, There is a group of microgrooves (G1, G2, G3) in which, in each microgroove (8, 8'), at least one ridge (10) is formed that traverses the microgroove (8, 8') in the radial direction and does not protrude from the outer surface (6) of the rib. The ridge has a height (h) in the radial direction. E ) and width (b E The diameters ranged from 0.2 mm to 0.4 mm.

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