Treads and vehicle tires with self-cleaning structure

Abstract

Tread (1) for a vehicle tire, wherein at least one passage (2, 3) for collecting and discharging mud and / or snow is formed in the tread (1), wherein the passage (2, 3) extends as a negative volume from an axially inner end (4) to an axially outer end (5), wherein at least one elevation (6, 7) is formed at the base of the passage (2, 3), wherein a first and a second elevation flank (8, 9) are formed in the elevation (6, 7), wherein the first elevation flank (8) is arranged in front of the second elevation flank (9) along a passage profile (10) coming from the axially inner end (4) and leading to the axially outer end (5), wherein the first elevation flank (8) can be described by first normal vectors (11) and the second elevation flank (9) by second normal vectors (12). The first normal vectors (11) enclose on average a smaller angle with the radial direction than the second normal vectors (12).

Description

[0001] The invention relates to a tread for a vehicle tire, wherein at least one passage for receiving and discharging mud and / or snow is formed in the tread, wherein the passage extends as a negative volume from an axially inner end to an axially outer end, wherein at least one elevation is formed at the base of the passage, wherein a first and a second elevation flank are formed in the elevation, wherein the first elevation flank is arranged in front of the second elevation flank along a passage profile coming from the axially inner end and leading to the axially outer end, wherein the first elevation flank can be described by first normal vectors and the second elevation flank by second normal vectors, wherein all first and second normal vectors have directional components oriented outwards in the radial direction,where all first normal vectors have directional components oriented opposite to the passage course and where all second normal vectors have directional components oriented along the passage course.,

[0002] It is common practice to provide treads for vehicle tires with a profile, whereby the profile can include passages for absorbing and draining mud, snow and water. The passages can be in the form of tread grooves, cuts and / or other negative volume and can divide the tread into ribs and / or tread blocks. It is also common practice to arrange raised sections at the base of the passages to improve the traction properties of the tread and / or to stabilize the tread. For example, US 2018 / 0001709 A1 describes bridge sections that create connections between the front and rear tread blocks and are arranged as raised sections at the base of transverse grooves. One problem with raised sections at the base of negative volumes is that mud and snow can become caught on the raised sections and thus prevent them from being drained out of the negative volume.

[0003] The invention is based on the object of maintaining the traction properties and stability of a tread at a high level, whereby a self-cleaning function against mud and / or snow is to be created or improved.

[0004] The object is achieved according to the invention in that the first normal vectors enclose on average a smaller angle with the radial direction than the second normal vectors.

[0005] The invention recognizes that a suitable orientation of the raised flanks can define a preferred direction for the movement of slush and snow through the passage. The first normal vectors, which are aligned closer to the radial direction, and the thus flatter first raised flank, promote the passage of slush and snow from the axial interior of the tread along the passage to the outside; conversely, the steeper second raised flank impedes the passage of slush and snow from the axial exterior.

[0006] Where the directional terms axial, in the axial direction, radial, in the radial direction and in the circumferential direction are used in this text, these refer to the tread as intended on a vehicle tire or the vehicle tire as intended on a vehicle and the rolling movement it performs. Here, the radial direction refers to a direction perpendicular to the axis of rotation of the vehicle tire and intersecting the axis of rotation. In the radial direction inward refers to the orientation that faces the axis of rotation in the radial direction. In the radial direction outward refers to the orientation that faces away from the axis of rotation in the radial direction. The circumferential direction refers to the direction of a rolling movement around the axis of rotation.When the vehicle is moving forward, a position at the front in the circumferential direction on the vehicle tire passes through a minimum distance from the road surface earlier than a position at the rear in the circumferential direction during a 180° rotation of the vehicle tire. The axial direction refers to a direction parallel to the axis of rotation. Pointing axially inward refers to an orientation that is axially facing a tire equator, a tire equator plane or a tire equator line. The tire equator plane is a plane perpendicular to the axis of rotation of the vehicle tire that runs through the center of the axial width of the vehicle tire, with the tire equator line running in the tire equator plane and on the surface of the vehicle tire. The transverse direction is a direction that consists of components of the radial direction and / or the axial direction.

[0007] In particular, the circumferential direction and the transverse direction can run on a base surface of the tread. The base surface coincides with the smooth surface that the tread would have if no small-scale profile elements, such as grooves or snow edges, were provided. Small-scale profile elements are characterized in at least one of the three dimensions: radial direction, axial direction, and circumferential direction, by a dimension and / or by a radius of curvature that is less than or equal to a maximum tread depth in the vehicle tire. The base surface is physically retained wherever no such profile elements are provided. The retained sections of the base surface can be at least partially intended for contact with a road surface and coincide with a running surface of the tread.Where, for example, a groove runs through a tread of a vehicle tire, the base area continues as an imaginary surface above the groove; where, for example, a snow edge is located on the tread, the base area continues as an imaginary surface below the snow edge.

[0008] All described features relate in particular to a new condition of the tread. The effects achieved by the features of the main claim can be supported and further enhanced by preferred embodiments and configurations.

[0009] A passage for collecting and discharging slush and / or snow is suitable for collecting slush and / or snow, in particular when the passage is located in the area of ​​the ground contact patch of the tread or tire contact area. Furthermore, the passage is suitable for discharging the collected slush and / or snow; this can occur by simple ejection when the passage leaves and / or has left the ground contact patch, wherein the ejection can be driven by centrifugal forces. Alternatively or additionally, a discharge movement directed parallel to the base surface can occur through the passage, which can in particular be directed at least partially from axially inward to axially outward; this movement can be driven by centrifugal forces and / or by the pressure of additional slush and / or snow entering the passage.A negative volume can be defined as a volume located below the base surface which is not filled with tire material, in particular not with a tread rubber compound, such as a tread groove or a cut.

[0010] The axially inner end of the passage lies axially within the axially outer end of the passage, and vice versa; the ends of the passage are thus defined relative to one another. Preferably, the passage path leading from the axially inner end to the axially outer end has a continuous axially outward directional component. However, it is also possible for the passage path to lead axially inward in sections, as long as the axially outer end is reached overall.

[0011] The first and / or second raised flanks can have a curved and / or arched profile. In a preferred embodiment, however, the first raised flank is largely defined by a first planar surface and / or the second raised flank is largely defined by a second planar surface. A majority can describe a proportion of more than 50%. In this case, a first normal vector on the first planar surface preferably encloses an angle with the radial direction that is 25° to 45° smaller than a second normal vector on the second planar surface. The same angular difference can advantageously exist between the average orientations of the sets of first and second normal vectors in the case of non-planar raised flanks.In the area mentioned, a sufficiently large difference in direction is achieved for the passage of mud and / or snow without having to make the second raised flank too steep or the first raised flank too flat and protruding.

[0012] In particular, the first normal vector on the first planar surface can enclose an angle between 30° and 50° with the radial direction, while the second normal vector on the second planar surface can enclose an angle between 65° and 85° with the radial direction. The same angle ranges can advantageously apply to the average orientations of the sets of first and second normal vectors for non-planar raised flanks.

[0013] The first and second raised flanks can each extend radially over a height between 0.5 mm and 4 mm, preferably between 1 mm and 2 mm. This range achieves a good compromise between the effectiveness of the raised flanks on the one hand and a sufficient negative volume of the passage on the other.

[0014] A plateau can be formed between the first and the second elevation flank. The plateau can be described by third normal vectors, wherein the normal vectors are preferably oriented substantially in the radial direction. The plateau can have a length of between 0.3 mm and 3 mm, preferably between 0.5 mm and 2 mm, along the course of the passage. A plateau running substantially parallel to the base surface gives the elevation a stable and streamlined structure. In the stated length range, a good compromise can be achieved between the effectiveness of the elevation on the one hand and sufficient negative volume of the passage on the other.

[0015] The passage may have a width perpendicular to the passage course and the radial direction and be bounded in the width direction by passage walls in both orientations, wherein the raised portion and the first and second raised portions preferably extend across the entire width and may be connected to the passage walls. Such a width extension ensures the maximum effectiveness of the raised portion in stabilizing the passage walls and in influencing snow and / or slush in the passage.

[0016] Connecting webs can be formed on the passage walls radially above the raised area, particularly in the region of the first and second raised area flanks. A connecting web can in particular also be arranged radially above the plateau between the two raised areas flanks. One connecting web can be formed on each passage wall for each unit consisting of the plateau and the first and second raised areas flanks, wherein the two connecting webs assigned to a unit can be arranged opposite one another. A connecting web can protrude from the passage wall into the passage at the radial height of the plateau by between 5% and 15% of the passage width. A connecting web can extend radially to between 1 mm and 5 mm, preferably to between 1 mm and 3 mm below the base surface.Such connecting bridges can further support the stabilizing effect of the elevations without excessively restricting the negative volume of the passage; they also create additional edges that can increase traction.

[0017] Preferably, a connecting web extends further into the passage radially at the bottom than at the top, and preferably extends into the passage in a continuously decreasing direction between its radially lower and upper ends. In a preferred embodiment, the connecting web merges continuously into the passage wall at its radially upper end. In this way, unnecessary edges in the tread strip can be avoided, which reduces the susceptibility of the tread to cracking and facilitates the flow of water, mud, and / or snow through the passage.

[0018] A first and a second web flank can be formed on a connecting web, wherein the first web flank is arranged in front of the second web flank along the passage profile coming from the axially inner end to the axially outer end. The first web flank can be described by fourth normal vectors and the second web flank by fifth normal vectors, wherein all fourth and fifth normal vectors have directional components running in the width direction of the passage. All fourth normal vectors can have directional components oriented opposite to the passage profile, wherein all fifth normal vectors have directional components oriented along the passage profile. Preferably, the fourth normal vectors enclose, on average, a smaller angle with the width direction than the fifth normal vectors.In this way, the preferred direction for the passage of mud and / or snow through the web flanks, achieved by the first and second raised flanks at the base of the passage, is also implemented at the passage wall. According to such an embodiment, passage along the passage course, from axially inside to axially outside, is easier due to the flatter flank angles on several sides of the passage cross-section than in the opposite direction, where steeper flank angles must be overcome.

[0019] A web wall can be arranged between the first and second web flanks, wherein normal vectors describing the web wall have essentially no directional components along the passage profile. The web wall can be formed along the passage profile in the region of the raised flanks and the plateau between the raised flanks and adjoin them radially above them. In this way, the raised flanks, plateau, web flanks, and web wall form a compact geometric unit with few unnecessary edges.

[0020] According to one embodiment, the elevation comprises a base, wherein the base extends radially between the bottom of the passage and an intermediate height. The base may comprise a first and a second base flank, via which the base rises and falls from the radial level of the passage bottom to the intermediate height. According to one embodiment, the base flanks may have a similar steepness to the second elevation flank. The first elevation flank and the second elevation flank may extend radially above the intermediate height.According to a preferred embodiment, the first and second raised flanks and a plateau arranged therebetween can be formed, in particular, in a partial region of the base, so that along the passage course, the radial level of the passage floor is initially present, then the level of the base is reached at the intermediate height, then the level of the plateau is reached via the first raised flank, and then the radial level of the base is reached again via the second raised flank. In this way, a radially multi-level topography is created, based on which the flow of mud and / or snow can be influenced particularly precisely and advantageously.

[0021] The elevation can comprise a plurality of first and second elevation flanks similar to the first and second elevation flanks, wherein the first and second elevation flanks can be arranged alternately along the passage. In particular, a plurality of units comprising a first elevation flank, a plateau, and a second elevation flank can be arranged one behind the other on a base along the passage. This results in a type of toothed structure with radial elevations arranged one behind the other, wherein the asymmetrical angular position of the first and second elevation flanks creates a scale-like pattern. The repeated sequence of first and second elevation flanks can define the preferred direction for the passage of mud and / or snow even more effectively.

[0022] According to one embodiment, four units comprising a first elevation flank, a plateau, and a second elevation flank are arranged one behind the other on a base along the passage. In particular, the units can be arranged in pairs, with the first elevation flank of a second unit being arranged along the passage at a distance of between 0 mm and 1 mm from the second elevation flank of a first unit, and the second elevation flank of the second unit being arranged between 2 mm and 4 mm from the first elevation flank of a third unit, and the third and a fourth unit being spaced approximately the same distance from one another along the passage as the first and second units.The first raised flank of the first unit can be positioned between 0 mm and 2 mm behind the first base flank along the passage, and the second base flank can be positioned between 1.5 mm and 3.5 mm behind the second raised flank of the fourth unit along the passage. The different spacings allow the effect of the raised flank on the passage of slush and / or snow of different substance, grain size, and / or viscosity to be adjusted.

[0023] Several similar elevations can be formed at the base of the passage. Similar means that the elevations share all or some of the features described above and / or below. For example, a first elevation comprising a base and four units consisting of a first and second elevation flank can be formed in the passage, and a second elevation comprising a base with only one unit consisting of a first and second elevation flank. In this way, the effect of the elevations can be distributed over the course of the passage and adapted to the requirements and conditions at different positions along the passage.

[0024] Preferably, several similar passages are formed in the tread. Similar here means that the passages have all or some of the features described above and / or below in common. The tread preferably comprises at least one first passage according to the invention, which leads from an axially inner position to a first tire shoulder, and a second passage according to the invention, which leads from an axially inner position to a second tire shoulder.

[0025] The passage may comprise sections of transverse grooves, diagonal grooves, and circumferential grooves. Preferably, the passage takes the form of a diagonal groove or a circumferential groove in the region of a raised portion. In this way, the preferred direction for the passage of mud and / or snow achieved according to the invention can be particularly effectively defined.

[0026] According to a preferred embodiment, a non-directional tread pattern is formed in the tread, with the passage forming part of this pattern. This creates a flexibly orientable tread pattern that, thanks to the inventive design, nevertheless exhibits excellent suitability for use off-road and / or on winter surfaces.

[0027] The present invention also relates to a vehicle tire comprising a tread according to the invention, preferably a tread according to the invention as described as preferred in the present text. Vehicle tires designed according to the invention are tires of any design, in particular radial tires, and tires of any type, in particular pneumatic vehicle tires for motor vehicles, such as passenger cars, light trucks, or commercial vehicles. The invention can also be particularly advantageously implemented on tires for two-wheelers, in particular on motorcycle tires. Vehicle tires according to the invention can be designed for rim sizes in a range between 16 inches and 26 inches, preferably in a range between 17 inches and 24 inches. In a manner known per se, a vehicle tire according to the invention can comprise a carcass with reinforcement members, bead regions with bead cores, a belt structure with reinforcement members, sidewalls, and / or other assemblies.

[0028] The invention also relates to a tire mold for producing a tread and / or vehicle tire according to the invention.

[0029] The tread can be developed with further features that are described in connection with the vehicle tire according to the invention and / or the tire shape according to the invention. The vehicle tire can be developed with further features that are described in connection with the tread according to the invention and / or the tire shape according to the invention. The tire shape can be developed with further features that are described in connection with the tread according to the invention and / or the vehicle tire according to the invention.

[0030] The invention is described below by way of example with reference to advantageous embodiments in the accompanying drawings. They show: Fig. 1 schematically and partially a perspective view of an embodiment of a vehicle tire according to the invention in the area of ​​the tread, Fig. 2 schematically shows a perspective view of an embodiment of a lifting device according to the invention, Fig. 3 schematically shows a sectional view according to the Fig. 2 drawn cutting line, Fig. 4 schematically shows a sectional view of another embodiment of a lift according to the invention.

[0031] Fig. Figure 1 shows a schematic and partial perspective view of an embodiment of a vehicle tire 27 according to the invention. The entire axial width in the region of a tread 1 with a profile 24 is depicted, with a section of two profile block lengths being depicted in the circumferential direction. Four circumferential grooves 23 are defined between the profile blocks, and oblique grooves 22 distributed over the circumference are defined between each axially outer and inner circumferential groove 23.

[0032] In the profile 24, passages 2, 3 for collecting and discharging mud and / or snow can be identified. Fig. 1 characterized passage 2 comprises sections of a circumferential groove 23 and a slanted groove 22 and extends between an axially inner end 4 and an axially outer end 5. The axially inner and outer ends 4, 5 and thus the exact course of the passage 2 can be defined in detail in a variable manner; what is crucial is that the axially inner end 4 is arranged axially within the axially outer end 5 and that the passage 2 located therebetween is designed as a continuous negative volume. The positions of elevations according to the invention are outlined with dashed lines, wherein a first elevation 6 and a second elevation 7 in Fig. 1 are provided with reference symbols 6, 7.

[0033] Fig. Figure 2 shows schematically a perspective view of an embodiment of a raised portion 7 according to the invention, which essentially corresponds to the second raised portion 7 according to Fig. 1 and can accordingly be arranged in a slanted groove 22. A half-open passage 2 is laterally delimited by two passage walls 14 arranged opposite one another, of which Fig. 2, only one is visible due to the nature of the illustration, with the passage walls 14 extending radially upwards to a base surface 25 of the tread. The elevation 7 is formed at the base 20 of the passage 2 and between the passage walls 14. The elevation 7 comprises a base 19, from which four units, each comprising a first elevation flank 8, a plateau 13 and a second elevation flank 9, extend radially upwards. The passage course 10, shown as a dashed line, leads into Fig. 2 from left to right. The first raised flanks 8 are accordingly directed towards the axially inner end 4 of the passage and the second raised flanks 9 towards the axially outer end 5 (cf. Fig. 1), wherein the first raised flanks 8 are flatter and the second raised flanks 9 are steeper than the other raised flank 8, 9. In this way, mud and / or snow experience less resistance when passing through the passage 2 along the passage course 10 than when passing through in the opposite direction, from the axially outer end 5 to the axially inner end 4. In other words, a preferred direction for the passage of mud and / or snow is created, which is conducive to cleaning the tread 1 with ejection to the axial outside, but not to the entry of material to the axial inside.

[0034] Connecting webs 15 are formed on the passage walls 14. Of the eight connecting webs 15, one extends radially above the elevation 7 per passage wall 14 in the area of ​​a unit consisting of raised flanks 8, 9 and plateau 13. Each connecting web 15 comprises a first web flank 16, a second web flank 17 and a web wall 18. Like the first and second raised flanks 8, 9, the web flanks 16, 17 can be set at different steepnesses relative to the passage profile 10, so that the effect of the preferential direction created by the elevation 7 is reinforced. The web walls 18 are bevelled relative to the passage wall 14, so that the connecting webs 15 taper from radially below to radially above and transition seamlessly radially above into the passage wall 14. The Fig. 2 The passage wall 14 opposite the visible passage wall 14 can be equipped with connecting webs 15 in a manner substantially identical to the visible passage wall 14.

[0035] Fig. 3 shows schematically a sectional view according to the Fig. 2 along the passage 10, which is in Fig. 3 runs from right to left. In the background, the passage wall 14 with the connecting webs 15 can be seen. In the foreground, the elevation 7 can be seen, whereby the elevation 7 comprises the base 19 and the four units consisting of the first and second elevation flanks 8, 9 and the plateau 13. The base surface 25 extends by a passage depth t of approximately 9 mm to 12 mm above the passage base 20. The connecting webs 15 extend by a height hv of approximately 8 mm above the intermediate height 21, whereby the intermediate height is increased by a height h S of the base 19 of approximately 2 mm above the passage base 20. The units consisting of the first and second raised flanks 8, 9 and plateau 13 rise by a height h Fof approximately 1.5 mm above the intermediate height 21. In the example shown, the first and second raised flanks 8, 9 can essentially be approximated by flat surfaces, which in turn appear as straight lines in the sectional view. The surfaces are each described by a normal vector 11, 12, wherein the normal vectors 11, 12 run in the plane of the drawing. According to the invention, the first normal vectors 11 on the first raised flanks 8 enclose smaller angles with the radial direction than the second normal vectors 12 on the second raised flanks 9. The different steepness of the raised flanks 8, 9 can be quantified by the normal vectors 11, 12.

[0036] Fig. 4 shows schematically a sectional view of a further embodiment of a raised portion 6 according to the invention. The raised portion 6 can essentially correspond to the first raised portion 6 according to Fig. 1 and as per Fig. 1, in a circumferential groove 23, which in turn is partially part of the passage 2. In contrast to the embodiment according to Fig. 3, only a single unit comprising the first and second raising flanks 8, 9 and the plateau 13 is arranged on the base 19 in the elevation 6, whereby the base 19 is correspondingly shorter. In the area of ​​the first and second raising flanks 8, 9, a connecting web 15 is arranged, which is raised by a height h A above the passage floor 20, it transitions seamlessly into the passage wall 14. List of reference symbols 1 tread 2 Passage 3 Passage 4 axial inner end 5 axial outer end 6 Increase 7 Increase 8 first boost edge 9 second boost edge 10 Passage course 11 first normal vectors 12 second normal vectors 13 Plateau 14 Passage Wall 15 Connecting bridge 16 first bridge flank 17 second bridge flank 18 bridge wall 19 bases 20 Passagengrund 21 intermediate height 22 diagonal groove 23 circumferential groove 24 Profiling 25 base area 27 vehicle tires h A Height of upper end of connecting bridge above passage floor h F Extension height of the raised flanks above the intermediate height h S Extension height of the base above the passage floor h V Extension height of the connecting webs above the intermediate height t Depth of the passage floor below the base area QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 2018 / 0001709 A1

[0002]

Claims

[1] Tread (1) for a vehicle tire (27), wherein at least one passage (2, 3) for receiving and discharging mud and / or snow is formed in the tread (1), wherein the passage (2, 3) extends as a negative volume from an axially inner end (4) to an axially outer end (5), wherein at least one elevation (6, 7) is formed at the base (20) of the passage (2, 3), wherein a first and a second elevation flank (8, 9) are formed in the elevation (6, 7), wherein the first elevation flank (8) is arranged in front of the second elevation flank (9) along a passage profile (10) coming from the axially inner end (4) and leading to the axially outer end (5), wherein the first elevation flank (8) can be described by first normal vectors (11) and the second elevation flank (9) by second normal vectors (12), wherein all first and second normal vectors (11, 12) have directional components oriented outwards in the radial direction,wherein all first normal vectors (11) have directional components oriented opposite to the passage course (10) and wherein all second normal vectors (12) have directional components oriented along the passage course (10), , characterized by that the first normal vectors (11) on average enclose a smaller angle with the radial direction than the second normal vectors (12). [2] Tread (1) according to claim 1, characterized by in that the first raised flank (8) is largely defined by a first flat surface and the second raised flank (9) is largely defined by a second flat surface, wherein a first normal vector (11) on the first flat surface encloses an angle with the radial direction which is 25° to 45° smaller than a second normal vector (12) on the second flat surface. [3] Tread (1) according to claim 2, characterized bythat the first normal vector (11) on the first flat surface encloses an angle between 30° and 50° with the radial direction, wherein the second normal vector (12) on the second flat surface encloses an angle between 65° and 85° with the radial direction. [4] Tread (1) according to one of claims 1 to 3, characterized by that the first and the second raising flank (8, 9) each extend radially over a height (h F ) between 0.5 mm and 4 mm, preferably between 1 mm and 2 mm. [5] Tread (1) according to one of claims 1 to 4, characterized bythat a plateau (13) is formed between the first and the second raised flank (8, 9), wherein the plateau (13) can be described by third normal vectors, wherein the third normal vectors are oriented substantially in the radial direction, wherein the plateau (13) has a length of between 0.3 mm and 3 mm, preferably between 0.5 mm and 2 mm, along the passage course (10). [6] Tread (1) according to one of claims 1 to 5, characterized by that the passage (2, 3) has a width perpendicular to the passage course (10) and to the radial direction and is limited in the width direction in both orientations by passage walls (14), wherein the elevation (6, 7) and the first and second elevation flanks (8, 9) extend over the entire width and are connected to the passage walls (14). [7] Tread (1) according to claim 6, characterized bythat connecting webs (15) are formed on the passage walls (14) radially above the elevation (6, 7), in particular in the region of the first and second elevation flanks (8, 9). [8] Tread (1) according to claim 7, characterized byin that a first and a second web flank (16, 17) are formed in at least one of the connecting webs (15), wherein the first web flank (16) is arranged in front of the second web flank (17) along the passage profile (10) coming from the axially inner end (4) and leading to the axially outer end (5), wherein the first web flank (16) can be described by fourth normal vectors and the second web flank (17) by fifth normal vectors, wherein all fourth and fifth normal vectors have directional components running in the width direction, wherein all fourth normal vectors have directional components oriented opposite to the passage profile (10), and wherein all fifth normal vectors have directional components oriented along the passage profile (10), wherein the fourth normal vectors enclose on average a smaller angle with the width direction than the fifth normal vectors. [9] Tread (1) according to one of claims 1 to 8, characterized by in that the elevation (6, 7) comprises a base (19), the base (19) extending radially between the base (20) of the passage (2, 3) and an intermediate height (21), the first elevation flank (8) and the second elevation flank (9) extending radially above the intermediate height (21). [10] Tread (1) according to one of claims 1 to 9, characterized by in that the elevation (6, 7) comprises a plurality of first and second elevation flanks (8, 9) in the manner of the first and second elevation flanks (8, 9), wherein first and second elevation flanks (8, 9) are arranged alternately along the passage course (10). [11] Tread (1) according to one of claims 1 to 10, characterized by that several similar elevations (6, 7) are formed at the bottom (20) of the passage (2, 3). [12] Tread according to one of claims 1 to 11, characterized bythat several similar passages (2, 3) are formed in the tread (1). [13] Tread (1) according to one of claims 1 to 12, characterized by that the passage (2, 3) in the region of a raised portion (6, 7) takes the form of an oblique groove (22) or a circumferential groove (23). [14] Tread (1) according to one of claims 1 to 13, characterized by that a non-directional profiling (24) is formed in the tread (1), the passage (2, 3) being part of this profiling (24). [15] Vehicle tire (27) comprising a tread (1) according to one of claims 1 to 14.

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