EP4244081A1 - Pneu de véhicule à rainure périphérique - Google Patents

Pneu de véhicule à rainure périphérique

Info

Publication number
EP4244081A1
EP4244081A1 EP21823177.7A EP21823177A EP4244081A1 EP 4244081 A1 EP4244081 A1 EP 4244081A1 EP 21823177 A EP21823177 A EP 21823177A EP 4244081 A1 EP4244081 A1 EP 4244081A1
Authority
EP
European Patent Office
Prior art keywords
section
cross
groove
circumferential
pneumatic vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21823177.7A
Other languages
German (de)
English (en)
Inventor
Wilke Eikermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Reifen Deutschland GmbH
Original Assignee
Continental Reifen Deutschland GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Reifen Deutschland GmbH filed Critical Continental Reifen Deutschland GmbH
Publication of EP4244081A1 publication Critical patent/EP4244081A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/032—Patterns comprising isolated recesses
    • B60C11/0323—Patterns comprising isolated recesses tread comprising channels under the tread surface, e.g. for draining water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
    • B60C11/045—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section the groove walls having a three-dimensional shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B60C11/1315—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls having variable inclination angles, e.g. warped groove walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0348—Narrow grooves, i.e. having a width of less than 4 mm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0353—Circumferential grooves characterised by width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0355—Circumferential grooves characterised by depth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles

Definitions

  • the invention relates to a pneumatic vehicle tire with a tread having a profile with at least one circumferential groove running in the circumferential direction of the pneumatic vehicle tire and designed to tread depth PT, which alternately over the entire tire circumference over partial sections of the circumference of the pneumatic vehicle tire has a first cross section and a second cross section perpendicular to the circumferential direction.
  • circumferential grooves in the tread of pneumatic commercial vehicle tires in the circumferential direction.
  • Such circumferential grooves separate circumferential ribs from one another, which can be provided with further grooves, for example transverse grooves, which give the circumferential ribs a block-like structure.
  • the structure of a circumferential groove is defined by its cross section perpendicular to the circumferential direction. This can be the same over the entire circumference of a pneumatic vehicle tire or it can be different in different partial sections of the circumference.
  • Circumferential grooves with a cross section perpendicular to the circumferential direction of the pneumatic vehicle tire, which has only one groove section, are widespread in treads of pneumatic vehicle tires.
  • a cross section can also have a plurality of groove sections, which then preferably adjoin one another in a radial direction R of the pneumatic vehicle tire.
  • the radial direction R is the direction perpendicular to the axis of rotation of the tyre, which defines the axial direction A (also referred to as the axial direction A) of the tyre, ie the center of the tyre, or the hub of the rim supporting the tyre pointing outwards to the axis of rotation.
  • the centrifugal force acts on the tire when a wheel equipped with the pneumatic commercial vehicle tire rotates.
  • a groove portion of a cross-section of a circumferential groove perpendicular to the tire circumferential direction is characterized by a certain geometric shape of the cross-section of the groove portion perpendicular to the tire circumferential direction, which clearly differs from the geometric shape of the cross-section of another groove portion perpendicular to the tire circumferential direction. Therefore, if a circumferential groove has only one groove portion, its cross section perpendicular to the circumferential direction of the tire can be described by a geometric shape. Circumferential grooves having only one groove portion have, for example, a V-shaped or U-shaped cross section perpendicular to the tire circumferential direction.
  • the cross section of a groove portion perpendicular to the circumferential direction of the tire is defined by two sides in the axial direction A.
  • a groove portion where these sides are almost or exactly parallel to the radial direction R has a U-shaped profile.
  • the tangent of the sides perpendicular to the circumferential direction encloses an angle with the radial direction which is not greater than 10°.
  • the tangent can run parallel to the radial direction.
  • the groove section has a V-shaped cross section.
  • the cross-section of a circumferential groove perpendicular to the circumferential direction can also be made up of several groove sections that extend in a radial direction R connect to each other.
  • the individual groove sections can be symmetrical to the radial direction.
  • Circumferential grooves are known in the tread of a pneumatic vehicle tire, which alternately have a first cross section and a second cross section perpendicular to the circumferential direction over the entire tire circumference and partial sections of the circumference of the pneumatic vehicle tire, in which one or both cross sections are composed of two or more groove sections, which are in one connect radial direction R to each other.
  • a first cross-section shown in the figure perpendicular to the circumferential direction has a first Groove portion 3 which is symmetrical to the radial direction Ri of the pneumatic vehicle tire shown by the arrow Ri in the figure.
  • the groove section has a constant width B v ,i in the axial direction A of the pneumatic vehicle tire, which is also shown in the figure by the arrow A, with its sides running parallel to the radial direction Ri.
  • the first groove section therefore has a U-shaped cross section.
  • a second groove section 4 adjoins this first groove section 3 in the radial direction Ri inwards (opposite to the direction of the arrow).
  • This groove section 4 has a cross section that is wider than the first groove section 3 in the axial direction A and is the innermost groove section of the circumferential groove, which also includes the groove base of the cross section of the circumferential groove 1 shown.
  • This second groove section 4 is also symmetrical to the radial direction Ri.
  • the first cross section shown in FIG. 1 has an outer, third groove section 5 perpendicular to the circumferential direction of the circumferential groove 1, which ends on the surface of the tread strip 2 of the pneumatic vehicle tire.
  • the cross section of the third groove portion 5 is symmetrical to the radial direction Ri of the pneumatic vehicle tire and in the radial direction Expanded outwards in the direction Ri, so that its width in the axial direction A increases from the width Bv,i of the first groove section 3 to the surface of the tread strip 2 up to the width Bv,o.
  • the second cross section of the known form of such circumferential grooves 1 has only one groove portion with an open V-shaped cross section.
  • the first cross section of the known form of a circumferential groove shown in FIG. 1 shows a reduced rolling resistance compared to other cross sections. This is based on the structure of the first groove section. This has a maximum width of 3 mm in axial direction A.
  • the small width of the first groove section in the axial direction ensures that the sides of the first groove section touch when a cross-section of the circumferential groove comes into contact with the road due to the vehicle weight, which compresses the rubber material of the tread. As a result, further deformation of the rubber material of the tread strip, particularly in axial direction A, is prevented in this area of the circumferential groove. This significantly reduces the rolling resistance of the pneumatic vehicle tire.
  • the contact pressure on the surface of the tread is reduced in this area due to the reduced width Bv,o of the circumferential groove on the surface of the tread and the resulting increased bearing surface of the tread as well as the touching of the groove sides, which leads to a reduction in tire wear.
  • the behavior in the wet in particular the braking behavior in the wet, is initially unfavorable in a new tire due to the compressed second groove section and only improves with increasing tire wear, whereby the second groove section with its expanded cross-section is then available as a reservoir for water from the road surface.
  • the second cross section of the circumferential groove has only one groove portion with an open V-shaped cross section.
  • Such a cross section of the circumferential groove is characterized by very good braking performance in the wet.
  • FIG. 6 Another embodiment of circumferential grooves in the tread strip of a pneumatic vehicle tire, which alternately over the entire tire circumference over partial sections of the circumference of the pneumatic vehicle tire have a first cross section and a second cross section perpendicular to the circumferential direction, in which both cross sections are composed of several groove sections that are in a radial direction Connecting R to one another is known from WO 2017/174925 A1, where it is shown in FIG. 6 as an example of the invention described.
  • a first cross-section there is then a groove section of constant width on the tread surface, which is followed in the radial direction inward by a further second groove section, the width of which increases steadily in the axial direction A inward to a maximum width.
  • first groove section the cross section of which widens continuously outwards perpendicular to the circumferential direction and ends in a wide groove section of constant width in axial direction A, which lies on the surface of the tread.
  • another small groove section adjoins the first groove section, which has a small, constant width over a small height in the radial direction R beyond the wear limit of the profile.
  • An essential feature of the circumferential groove shown is that the height in the radial direction R of the second groove section of the first cross section and the height in the radial direction R of the first groove section of the second cross section largely comprise the profile depth of the circumferential groove.
  • a further embodiment of circumferential grooves in the tread of a pneumatic vehicle tire which alternately over the entire tire circumference over partial sections of the circumference of the pneumatic vehicle tire have a first cross section and a second cross section perpendicular to the circumferential direction, in which both cross sections are composed of several groove sections, which are in one Connect to each other in the radial direction R, known from US 2020/0164694 Al.
  • a first cross-section there is initially a groove section of constant width on the tread surface, which is adjoined in the radial direction inward by a further second groove section, the width of which in axial direction A first increases with increasing distance from the tread surface and then reduces again.
  • the second cross section there is a first groove section in front of which cross section in the circumferential direction widens continuously outwards up to the surface of the tread strip.
  • a second small groove section adjoins the first groove section, which has a small, constant width over a small height in the radial direction R.
  • the height of this section in the radial direction is small compared to the height of the second groove section in the radial direction of the first cross section.
  • this second groove section is adjoined inwardly by a third groove section, the width of which in axial direction A increases again with increasing distance from the tread surface.
  • the small surface area of the abutting sides means that the rubber material can still avoid the forces acting on it when the second cross-section of the circumferential groove comes into contact with the road, particularly in the radial direction through the third groove section and is still subject to deformation.
  • the circumferential groove therefore still has a considerable rolling resistance in the areas in which it has the second cross section.
  • the object of the invention is to provide circumferential grooves for a pneumatic vehicle tire that continue to have good wet properties as a safety feature and whose rolling resistance is further reduced in order to achieve further fuel savings and thus an improved CO2 balance for the vehicle on which the pneumatic vehicle tire is mounted are mounted.
  • Such a pneumatic vehicle tire is a pneumatic vehicle tire with a tread having a profile with at least one circumferential groove running in the circumferential direction of the pneumatic vehicle tire and designed to a tread depth PT, which alternately over the entire tire circumference over partial sections of the circumference of the pneumatic vehicle tire has a first cross section perpendicular to the circumferential direction, which consists of composed of at least two in a first radial direction Ri of the pneumatic vehicle tire adjoining groove sections, a first to the first radial Direction Ri symmetrical groove section, the width of which in axial direction A of the pneumatic vehicle tire is less than 3 mm and varies by no more than 10%, preferably varies by no more than 2% and particularly preferably varies by no more than 0.5% and a radially inner opposite the first groove section in axial direction A and has the largest cross-sectional area of all groove sections, which is preferably also symmetrical to the first radial direction Ri, and has a second cross section perpendicular to the circumferential
  • a pneumatic vehicle tire according to the invention has treads with a profile. This includes at least one circumferential groove in the circumferential direction of the pneumatic vehicle tire. It runs all the way around and has a profile depth PT. Correspondingly, each of these circumferential grooves has a tread depth PT over the entire circumference of the tire, although different circumferential grooves can have different tread depths PT.
  • a circumferential groove made to a tread depth PT then has the same tread depth over the entire tire circumference, at least when the tire is new, with a tolerance of typically 0.10 to 0.15 mm, which is only due to production.
  • tread wear indicators tread wear indicators
  • the tread depth can deviate by the height of the tread wear indicators at these points.
  • the height of a wear indicator can be 1.2 mm, for example.
  • Crossbars in a circumferential groove at the bottom of the groove, for example, are arranged evenly over the circumference of the tire as wear indicators.
  • At least one of these circumferential grooves of the profile of the tread strip alternately has a first cross section and a second cross section perpendicular to the circumferential direction of the pneumatic vehicle tire over the entire tire circumference over partial sections of the circumference of the pneumatic vehicle tire.
  • the first cross section of the circumferential groove perpendicular to the circumferential direction of the pneumatic vehicle tire is composed of at least two groove sections adjoining one another in a first radial direction Ri of the pneumatic vehicle tire, a first and a second groove section.
  • a first groove section is symmetrical to the first radial direction Ri.
  • the first radial direction Ri is defined by the symmetry of the cross section of the first groove section perpendicular to the circumferential direction.
  • the width of the first groove section in axial direction A of the pneumatic vehicle tire is less than 3 mm. It varies by no more than 10%, preferably varies by no more than 2% and particularly preferably varies by no more than 0.5%. However, the width of the first groove section can also be constant in a very advantageous embodiment. Deviations beyond this in the width of the first groove section are then due solely to the limits of the production of a circumferential groove.
  • the tolerance of the width of the first groove section that occurs as a result is typically less than 0.2 mm, preferably less than 0.15 mm and particularly preferably less than 0.05 mm.
  • the second groove section of the first cross-section of the circumferential groove is arranged radially inwards relative to the first groove section, ie it directly adjoins the first groove section in the radial direction Ri, with the second groove section being closer to the The center of the tire is arranged and vice versa has a greater distance from the tread surface than the first groove section. Furthermore, the second groove section of the first cross section is widened in axial direction A compared to the first groove section. That is, it has a width in the axial direction A that is greater than the maximum width of the first groove section.
  • the second groove section preferably has a width in axial direction A that is greater than the maximum width of the first groove section over a larger extent in the first radial direction Ri or a larger area of the distance from the circumferential groove to the tread surface, the depth of the circumferential groove.
  • the second groove section has a width in the axial direction A over an extension in the radial direction Ri of at least 3 cm, preferably at least 4.5 cm and particularly preferably at least 5.5 cm, which is greater than the maximum width of the first groove section is.
  • the second groove section typically has a width in the axial direction A over at least 50% of its maximum extent in the radial direction Ri, preferably over 75% of its maximum extent in the radial direction Ri and particularly preferably over 90% of its maximum extent in the radial direction Ri , which is larger than the maximum width of the first groove section.
  • the second groove portion of the first cross section of the circumferential groove perpendicular to the circumferential direction of the pneumatic vehicle tire has the largest cross-sectional area perpendicular to the circumferential direction of all the groove portions of the first cross section.
  • the second groove section of the first cross section of the circumferential groove is also symmetrical to the first radial direction Ri.
  • the second cross section of the circumferential groove perpendicular to the circumferential direction of the pneumatic vehicle tire is also composed of at least two groove sections adjoining one another in a second radial direction R2 of the pneumatic vehicle tire, a first and a second groove section. These are both symmetrical about the radial direction R2.
  • the first groove portion of the second cross section perpendicular to the circumferential direction widens outward. This means that the width of this section of the groove in the axial direction A increases as the distance from the surface of the tread of the pneumatic vehicle tire decreases, or as the depth of the circumferential groove decreases.
  • the second groove portion of the second cross section perpendicular to the circumferential direction is narrowed and inward from the first groove portion of the second cross section. That is, the width in the axial direction A of the second groove portion is not greater than the smallest width in the axial direction A of the first groove portion.
  • the first groove section at its greatest distance from the surface of the tread of the pneumatic vehicle tire, or at its greatest depth, since it widens outward.
  • the second groove section which is on the inside compared to the first groove section, adjoins the first groove section in the second radial direction R2.
  • the second groove section is arranged closer to the center of the tire and, conversely, has a greater distance to the tread surface than the first groove section.
  • the width of the second groove section in axial direction A of the pneumatic vehicle tire varies by no more than 10%, preferably no more than 2% and particularly preferably no more than 0.5%.
  • the width of the second groove section can also be constant in a very advantageous embodiment. Deviations beyond this in the width of the second groove section are then due solely to the limits of the production of a circumferential groove.
  • the tolerance of the width of the second groove section that occurs as a result is typically less than 0.2 mm, preferably less than 0.15 mm and particularly preferably less than 0.05 mm.
  • the width of the second groove section of the second cross section in axial direction A is less than 40%, preferably less than 30% and particularly preferably less than 25% of the width By,o in axial direction A of the second cross section on the surface of the tread when the pneumatic vehicle tire is new .
  • the width of the second groove section of the second cross section is thus significantly reduced in the axial direction compared to the original width of the second cross section of the circumferential groove on the tread surface of the new pneumatic vehicle tire.
  • the second groove portion of the second cross section extends over at least 50% of the height of the second groove portion of the first cross section in the radial direction Ri in the radial direction R2.
  • the height H of a groove section of a cross-section of a circumferential groove in a radial direction R of the cross-section is defined as the maximum height of the cross-sectional area of the groove section in the direction of the radial direction R and is given by the maximum distance between two points of the edge of the cross-sectional area, which it is only in identify the radial direction R to each other. Their distance perpendicular to the radial direction is not considered here. With many cross-sectional areas of a groove portion present in the cross-sections perpendicular to the circumferential direction of a circumferential groove of a pneumatic vehicle tire according to the invention, this maximum distance can be found precisely in the radial direction R.
  • the length of the second groove section of the second cross-section in the radial direction of the cross-section R2, the width of which varies by at most 10% in the axial direction, and thus its height in the radial direction R2, is thus coupled with the height of the second groove section of the first cross-section and such that its length is at least half the height of the second groove portion of the first cross section in the radial direction of the first cross section Ri.
  • the second groove portion of the second cross-section of the circumferential groove is spaced over at least 50% of its height in the radial direction R2 from the surface of the tread where the second groove portion is located in the first cross-section.
  • the distance from the surface of the tread for a location in a circumferential groove corresponds to the depth of the circumferential groove at that location.
  • the second groove section of the second cross-section is thus located at the depth of the circumferential groove over at least 50% of its height, in which the second groove section is located in the first cross-section.
  • Both groove sections, the second groove section of the second cross section and the second groove section of the first cross section are thus located over a larger extent of the second groove section of the second cross section, namely over at least 50% of the extent of the second groove section of the second cross section, in the region of the same depth Circumferential groove, albeit in different sections of the circumference.
  • the improved geometry of the second cross section of the circumferential groove perpendicular to the circumferential direction improves the rolling resistance of the circumferential groove in the area of the second cross section without significantly reducing the wet behavior of the second cross section compared to the solutions of circumferential grooves in a vehicle tread strip known from the prior art with over cross-sections alternating around the circumference of the tyre.
  • This is achieved in that the second groove section of the second cross section is narrowed compared to the first groove section to a width in axial direction A that is significantly reduced compared to the width of the second cross section on the tread surface. It extends in the radial direction R2 to a significant length that is at least 50% of the height of the second groove portion of the first cross section.
  • the second groove portion is positioned only at a depth of the circumferential groove such that at least 50% of its height in the radial direction R2 is at the same depth as the second groove portion of the first cross section serving as the roadway water receiving reservoir.
  • the first groove section of the second cross section of the circumferential groove is therefore at a maximum depth of the circumferential groove at which at most the upper 50% of the height of the second groove section is located in the first cross section of the circumferential groove, or only at a maximum in the Depth of a groove section of the first cross section, which is at a smaller distance from the tread surface than the second groove section of the first cross section, such as in particular the first groove section of the first cross section.
  • the sides of the first groove section now converge with increasing circumferential groove depth and end in the narrowed groove section of reduced width, the sides of the second groove section are already compressed at a lower depth of the circumferential grooves in comparison to the circumferential grooves known from the prior art in the second cross section so that they touch.
  • the resulting reduced deformation of the tread strip at a lower depth further improves the rolling resistance of the pneumatic vehicle tire and increases the rigidity of the cross section. This effect is already used in a pneumatic vehicle tire according to the invention when it is new.
  • the first groove section of the second cross section and its groove sections which may be arranged on the outside in the radial direction, offer sufficient capacity to absorb road water and ensure good wet behavior of the circumferential groove, so that vehicle safety is ensured by good braking behavior in wet conditions.
  • the second groove section of the second cross section of the at least one circumferential groove extends over at least 80% of the height of the second groove section of the first cross section in the radial direction Ri in FIG radial direction R2.
  • the length of the second groove section of the second cross section in the radial direction of the cross section R2 and thus its height in the radial direction R2 is therefore dimensioned according to the height of the second groove section in such a way that its length is at least 80% of the height of the second groove section of the first cross section in the radial direction of the first cross section corresponds to Ri.
  • the second groove section of the second cross section in the radial direction R2 extends over at least the height of the second groove section of the first cross section in the radial direction Ri in the radial direction R2.
  • the length of the second groove section of the second cross section in the radial direction of the cross section R2 and thus its height in the radial direction R2 is therefore dimensioned according to the height of the second groove section in such a way that its length is at least the height of the second groove section of the first cross section in the radial direction of the first cross section corresponds to Ri.
  • the second groove section of the second cross section of the at least one circumferential groove extends over at most 125% of the height of the second groove section of the first cross section in the radial direction Ri in the radial direction R2, preferably over at most 115% of the height of the second groove section of the first cross section in the radial direction Ri and particularly preferably over at most 110% of the height of the second groove section of the first cross section in the radial direction Ri.
  • the height of the second groove section of the second cross section in the radial direction R2 should not be too large so that the groove sections opposite the second groove section have a smaller distance to the tread surface, such as in particular the first groove section with a given tread depth PT have enough depth to absorb sufficient road surface water and thus contribute to the braking performance in wet conditions of the pneumatic vehicle tire.
  • the second groove section of the second cross section of the at least one circumferential groove is at least 75% of its height in the radial direction R2 at a distance from the surface of the tread, at which the second groove section is located at the first cross-section.
  • the second groove section of the second cross section is at a distance from the surface of the tread over its entire height in the radial direction R2, at which the second groove section is located in the first cross section. The larger the area of the distance to the surface, i.e.
  • the area of depth, in which both the second groove section of the first cross section and the second groove section of the second cross section is present the more roadway water from the second cross section can get into the second groove section of the get first cross-section and thus the wet behavior of the pneumatic vehicle tire can be improved.
  • the height of the first and second groove section of the first cross section in the radial direction Ri is greater than 70% of the profile depth PT of the circumferential groove, preferably greater than 80% of the profile depth PT of the circumferential groove, particularly preferably greater than 85 % of that of the circumferential groove tread depth PT, and most preferably greater than 90% of that of the circumferential groove tread depth PT.
  • the first cross section has at least one additional groove section that is at a smaller distance from the tread surface than the first and second groove section, unless the height of the first and second groove section of the first cross section already corresponds to the profile depth PT. Then the first groove section ends at the tread surface. If at least one further groove section belongs to the first cross section of the circumferential groove, this preferably has a greater width in axial direction A than the first groove section in order to improve the wet behavior of the pneumatic vehicle tire through a greater absorption capacity of roadway water.
  • the bottom area of the circumferential groove directly adjoins the second groove section of the second cross section inward in the radial direction R2.
  • the bottom area of the circumferential groove includes the groove base with the deepest point of the circumferential groove, which is at the greatest distance from the tread surface. This distance corresponds to tread depth PT. From the deepest point of the circumferential groove, the width of the circumferential groove in the axial direction A with decreasing depth, i.e. decreasing distance from the tread surface, increases steadily in the bottom area of the circumferential groove, until the bottom area reaches the width of the second groove section of the second cross section in the axial direction A.
  • the bottom area already has a width in axial direction A at the deepest point of the circumferential groove. Then the groove bottom is formed by a straight line parallel to the axial direction A, which has the profile depth PT, and the bottom area of the second cross section of the transverse groove is formed by a surface in the axial direction A along the circumferential direction. This surface then preferably transitions via a curve into the sides of the cross-sectional surface of the second groove section of the second cross-section.
  • the bottom portion of the second cross section of the circumferential groove is symmetrical to the radial direction R2.
  • the base area of the second cross section merges from the deepest point of the circumferential groove with a constant radius of curvature into the second groove section of the second cross section. This radius of curvature results from the width By,2 of the second groove section in the axial direction A, in that it is half the width By,2.
  • the cross section of the bottom area perpendicular to the circumferential direction is a semicircle with a diameter equal to the width By.2 of the second groove portion in the axial direction A at the end of the second groove portion that is adjacent to the bottom area, i.e. at the end that from the tread surface is farthest away.
  • the total height of the second groove section of the second cross section and the bottom area of the circumferential groove in the radial direction R2 typically differs from the distance between the edge points of the cross-sectional area of the second groove section of the first cross section perpendicular to the circumferential direction with the greatest distance from the radial direction Ri to the deepest point of the cross-sectional area in the radial direction Ri by not more than 20%, preferably by not more than 10%, and more preferably by not more than 5%.
  • the sum corresponds to the height H2y of the second groove portion of the second cross section in the radial direction R2 and the height of the bottom portion of the second Cross-section in the radial direction R2, which corresponds to the distance from the deepest point to the inner end of the second groove section, approximately the distance of the depth of the widest extension of the second groove section of the first cross-section to the groove bottom of the first cross-section where its deepest point lies. Since the profile depth of the transverse groove is the same over the entire tire circumference, the second groove section and the bottom area of the second circumferential groove are then at the same depth as the area of the second groove section below its greatest extent in axial direction A. These areas of the two cross-sections of the circumferential groove can i.e.
  • the average width By, 2 in the axial direction A of the second groove section of the second cross section is typically 2 mm to 6 mm, preferably 2.5 mm to 4 mm and particularly preferably 2.8 mm to 3.5 mm.
  • the sides of the second groove section are then pressed together in the second cross section so that they touch, which significantly reduces flexing of the rubber material of the tread strip in the area of the second cross section of the circumferential groove.
  • the rolling resistance of the pneumatic vehicle tire according to the invention is then correspondingly reduced by this dimensioning.
  • This ratio of the width of the inner groove sections of both cross-sections is selected in particular in such a way that the wet behavior and the rolling resistance of the circumferential groove are optimized at the same time.
  • the ratio of the average width By.2 in the axial direction A of the second groove section is the second Cross-section to the mean width Bv,i in the axial direction A of the first groove section of the first cross-section between 1.0 and 6.0, preferably between 2.0 and 4.5 and particularly preferably between 2.3 and 3. Due to the significantly larger Width By,2 of the second groove section of the second cross-section ensures that roadway water can be absorbed by the second groove section of the second cross-section and then can get into the second groove section of the first cross-section.
  • the at least one circumferential groove is directly adjoined to the second groove section of the second cross section in the radial direction R2 inwards by a third groove section, which encompasses the base area of the second cross section and is drop-shaped, with its maximum width By.s in the axial direction A is larger than the average width By,2 in the axis direction A of the second groove portion of the second cross section.
  • the third groove section of the second cross section is at a greater distance from the tread surface than the second groove section of the second cross section, with the second groove section merging into the third groove section.
  • the width of the third groove section increases in the direction of the axis up to its maximum width By,3.
  • the bottom of the groove can also be a straight line in the axial direction A, which has the greatest distance from the tread surface, which then takes on the role of the lowest point of the circumferential groove.
  • the third The width of the groove section is increased compared to the second groove section and it can then, in particular, absorb road water entering the second groove base with a larger volume.
  • this absorbed road water in particular due to the rotation of the pneumatic vehicle tire, can then also reach the second groove section of the first cross section, which has an even larger volume for absorbing road water having.
  • the edge of the cross-sectional area of the third groove section of the second cross section perpendicular to the circumferential direction is circular with a diameter By,3 that is greater than the average width By.2 in axial direction A of the second groove section of the second cross section.
  • the diameter By,3 of the circular edge of the cross-sectional area of the third groove portion of the second cross-section is 1.2 to 4 times, preferably 2 to 3 times, and more preferably 2.3 to 2.7 times as the average width BY.2 in the axis direction A of the second groove portion of the second cross section.
  • the second groove section of the second cross-section extends in the radial direction R2 over a length H2y which is at least as great as the diameter By,3 of the circular edge of the cross-sectional area of the third groove section, preferably 15% greater than the diameter BY.3 of the circular edge of the cross-sectional area of the third groove portion and more preferably 25% larger than the diameter By,3 of the circular edge of the cross-sectional area of the third groove portion.
  • the length H2y in the radial direction R2 of the second groove section corresponds to the height of the second groove section in the radial direction R2.
  • the second groove portion is regarded as a channel in the radial direction R2 that guides road water into the circular droplet of the third groove portion while having a certain length H2y.
  • the mean width is typically By, 2 of the second groove section in axial direction A of the pneumatic vehicle tire of the second cross section is less than 15%, preferably smaller than 12% and particularly preferably smaller than 10% of the width By.o in axial direction A of the second cross section on the surface of the tread when the pneumatic vehicle tire is new.
  • the width By,2 of the second groove section in axial direction A of the pneumatic vehicle tire of the second cross section is typically greater than 4%, preferably greater than 6% and particularly preferably greater than 8% of the width By,o in axial direction A of the second cross section on the surface of the tread when the pneumatic vehicle tire is new.
  • this ratio of the width By.2 of the second groove section to the width By.o is selected in the second cross section of the circumferential grooves in such a way that the wet behavior and the rolling resistance of the circumferential grooves are optimized at the same time.
  • the average width By,2 in the axial direction A of the second groove section of the second cross section is in the embodiments in which, in the case of the at least one circumferential groove, a third groove section directly adjoins the second groove section of the second cross section inward in the radial direction R2, which includes the bottom area of the second cross-section and is drop-shaped, typically 0.7 mm to 2.5 mm, preferably 1 mm to 1.7 mm and particularly preferably 1.1 mm to 1.3 mm.
  • the second groove section of the second cross section extends in the radial direction R2 in the embodiments in which, in the case of the at least one circumferential groove, a third groove section directly adjoins the second groove section of the second cross section in the radial direction R2 inwards, which comprises the base region of the second cross section and is drop-shaped, typically over a length H2y of 2 mm to 6 mm, preferably over a length of 2.7 mm to 4.5 mm and more preferably over one Length from 3.2mm to 4mm.
  • This dimensioning of the second groove section promotes the reduction of the rolling resistance of the pneumatic vehicle tires according to the invention.
  • the first groove section of the second cross section of the at least one circumferential groove widens constantly outwards.
  • the sides of the cross-sectional area of the first groove section perpendicular to the circumferential direction are then formed by straight lines and the cross-sectional area of the first groove section then has the shape of an isosceles trapezium.
  • the sides of the cross-sectional area perpendicular to the circumferential direction of the pneumatic vehicle tire of the first groove section of the second cross-section compared to the radial direction R2 typically have an inclination of 20° to 80°, preferably an inclination of 30° to 60° and particularly preferably an inclination of 40° up to 50°.
  • the second groove section of the first cross-section of the circumferential grooves can, in certain embodiments, have sides which are partially formed as a straight line which runs inwards towards the radial direction Ri, ie with increasing distance from the tread surface. Then typically the ratio of the angle of inclination of the sides of the cross-sectional area designed as straight lines perpendicular to the circumferential direction of the pneumatic vehicle tire of the first groove section of the second cross-section compared to the radial direction R2 to the angle of inclination of the sides of the cross-sectional area running inwards towards the radial direction Ri is perpendicular to the circumferential direction of the second groove section of the first cross-section in relation to the radial direction Ri is between 1.5 and 10, preferably between 1.75 and 4 and particularly preferably between 2 and 2.5.
  • the sides of the first groove section of the second cross section thus have a significantly greater inclination than the sides of the second groove section of the first cross section. Due to this large inclination of the sides of the first groove section of the second cross section, the rolling resistance of the tread of the pneumatic vehicle tire in the area of the second cross section is reduced in a targeted manner compared to the prior art, since the rubber material of the tread is already present closer to the surface of the tread, so that an elevated one Has rigidity and is less flexed during tire rotation in the state of contact with the road.
  • the ratio of the area of the cross-sectional area perpendicular to the circumferential direction of the second groove section of the first cross-section to the area of the cross-sectional area perpendicular to the circumferential direction of the second groove section of the second cross-section is between 1 and 3, preferably between 1.5 and 2 .5 and more preferably between 2 and 2.3.
  • the area of the second groove section of the second cross-section is thus preferably significantly smaller than that of the second groove section of the first cross-section, since their sides are intended to be compressed when contacting the road surface.
  • the area of the second groove portion of the second cross-section is so large that a certain amount of wet road water can still be accommodated in the second groove portion of the second cross-section before its sides are compressed.
  • the absorbed water is pressed into the second groove section of the first cross section, which has a greater absorption capacity for the water.
  • the proportion of the length of the partial sections of the circumference of the pneumatic vehicle tire, in which a circumferential groove has the first cross section, compared to the total length of the circumferential groove is between 25% and 75%, preferably between 30% and 70%, and particularly preferably between 40% and 60%
  • the proportion of the length of the partial sections of the circumference of the pneumatic vehicle tire in which a circumferential groove has the first cross section is one compared to the total length of the partial sections of the circumference of the pneumatic vehicle tire Circumferential groove in which the circumferential groove has the first cross-section or second cross-section between 40% and 85%, preferably between 60% and 80%, and more preferably between 70% and 78%.
  • the total length of the sections in which the circumferential groove has the first cross section is particularly preferably three times the total length of the sections in which the circumferential groove has the second cross section.
  • the first cross section then extends over three times the length in the circumferential direction compared to the second cross section in the case of a circumferential groove.
  • the length in the circumferential direction over which the first and the second cross section extend can be different or the same if there are several circumferential grooves.
  • the cross section of the circumferential groove is V-shaped in the at least one circumferential groove in the transition areas between a section with the first cross section and a section with the second cross section.
  • the length L3y of a transition area is generally typically 3% to 30%, preferably 10% to 25% and particularly preferably 15% to 20% of the length Liv of the section with the first cross section on the tread surface.
  • the total length of sections of the circumference of the pneumatic vehicle tire in which the at least one circumferential groove has the first cross section or second cross section accounts for 50% to 90% of the Total length of the circumferential groove in the circumferential direction, preferably 60% to 80% of the total length of the circumferential groove in the circumferential direction, and more preferably 65% to 70% of the total length of the circumferential groove in the circumferential direction.
  • a pneumatic vehicle tire according to the invention has two adjacent circumferential grooves that alternately have a previously described first cross section and second cross section perpendicular to the circumferential direction over the entire tire circumference over partial sections of the circumference of the pneumatic vehicle tire.
  • all sections of the first cross section and the sections of the circumferential grooves that do not have the first cross sections, but rather two transition regions between the two cross sections and the section that has the second cross section, of the two circumferential grooves have the same length
  • the arrangement of these sections preferably having the two circumferential grooves is such that when one of the two circumferential grooves has the first cross-section of the circumferential groove, in the same section, ie in the section with the same circumferential position, of the other circumferential groove there is the section which does not have the first cross-section of the circumferential groove, but the section with the second cross section and the two transition areas between the two cross sections.
  • a preferred embodiment has two adjacent circumferential grooves in which the partial sections of the first and the second cross-section then have such the two circumferential grooves are arranged such that the center of a circumferential section of the first cross section is arranged on one of the two circumferential circumferential grooves so that on the other of the two circumferential grooves in the circumferential direction the center of a circumferential section is arranged at the same position, the has the second cross-sectional profile.
  • the centers of the sections having a circumferential cross section are positioned at the same locations of the two adjacent circumferential grooves.
  • the two adjacent circumferential grooves each have a different cross section at these points, one circumferential groove having the first cross section and the other the second cross section.
  • This arrangement of the cross sections also means that the pneumatic vehicle tire has good wet performance and reduced rolling resistance, both over the circumference and in the axial direction.
  • the cross-sectional area of the second groove section of the first cross-section of the at least one circumferential groove comprises the bottom region of the circumferential groove, which has an edge without corners. This then reduces the risk of groove breakage during the first cross-section.
  • the second cross section of the at least one circumferential groove consists only of the first groove section and the second groove section. Then, as previously described, the bottom area of the circumferential groove adjoins the second groove section inward.
  • the second cross section of the at least one circumferential groove consists only of the first groove section, the second groove section and the teardrop-shaped third groove section, which encompasses the base area and for which advantageous configurations have already been described above.
  • at least one circumferential groove is followed by a fourth groove section, the width of which in axial direction A differs from the maximum width By max des first groove section of the second cross-section expands outwards by no more than 40%, preferably no more than 10% and particularly preferably no more than 0.5%.
  • the fourth groove section is primarily intended to absorb larger amounts of road surface water and, in contrast to the first groove section, contributes little to reducing rolling resistance in the area of the circumferential grooves.
  • the fourth groove section also ends at the surface of the tread.
  • the fourth groove section can also preferably have a constant width in the axial direction A over its height H4y in the radial direction R2.
  • the height H4y of the fourth groove section of the second cross section in the radial direction R2 is typically less than 40% of the profile depth PT, preferably less than 10% of the profile depth PT and particularly preferably less than 5% of the profile depth PT.
  • the height H4y of the fourth groove section of the second cross-section is typically less than 5 mm, preferably less than 3 mm and more preferably less than 1 mm.
  • the second cross section consists only of the first groove section, the second groove section, the third groove section described above and the fourth groove section. Detailed configurations of these groove sections of the second cross section of the at least one circumferential groove have been described above.
  • the first cross-section perpendicular to the circumferential direction, beginning at the outer surface of the tread is made up of three groove sections that adjoin one another in a first radial direction Ri of the pneumatic vehicle tire and are symmetrical to the radial direction Ri, wherein a third groove section begins on the outer surface of the tread strip, widens outwards and the first groove section adjoining the third groove section narrows in relation to this.
  • the third groove section of the first cross section preferably constantly widens outwards.
  • the ratio of the angle of inclination of the sides of the cross-sectional area perpendicular to the circumferential direction of the pneumatic vehicle tire of the first groove section of the second cross section compared to the radial direction R2 to the angle of inclination of the sides of the cross-sectional area perpendicular to the circumferential direction of the pneumatic vehicle tire of the third groove section of the first cross section compared to the radial direction Ri then typically has one Value between 0.9 and 1.4, preferably between 1 and 1.3 and more preferably between 1.1 and 1.2.
  • the sides of its second groove section touch each other more quickly when the cross section comes into contact with the road than in the corresponding (second) cross sections known from the prior art.
  • the energy input into the rubber material of the pneumatic vehicle tire due to its rolling movement is reduced and thus also the rolling resistance of the pneumatic vehicle tire.
  • the geometry of the circumferential grooves of the pneumatic vehicle tire according to the invention is designed in such a way that road water can be transported between the second groove sections of both cross sections. As a result, there is a drainage system for water in the circumferential grooves, which improves the wet behavior and in particular the water absorption capacity of the pneumatic vehicle tires according to the invention.
  • the pneumatic vehicle tires according to the invention can be used in trucks (trucks), in which the reduced rolling resistance can reduce fuel consumption and still provide a high level of vehicle safety thanks to good wet performance, in particular good braking performance in wet conditions, including the increased absorption capacity of the road surface water contributes.
  • trucks trucks
  • these properties can be specifically optimized as needed.
  • Fig. 2 Second V-shaped cross section of a circumferential groove according to the prior art
  • Fig. 3 Tread detail of a vehicle tire according to the prior art
  • Fig. 4 First cross section of a circumferential groove with two groove sections
  • FIG. 1 a first cross-section of a circumferential groove is shown, which is present or can be present both in the prior art and in the embodiments according to the invention.
  • This cross-section has already been briefly explained before.
  • 1 shows a circumferential groove 1 which is arranged in a tread 2 of the pneumatic vehicle tire.
  • the cross section of the circumferential groove shown has three groove sections.
  • a first groove section 3 has a constant width Bv,i of 1.2 mm.
  • This groove portion is symmetrical to the radial direction Ri.
  • a second groove section 4 adjoins inward in the radial direction Ri. This means that this groove section 4 is at a greater distance from the surface of the tread strip 2 than the first groove section 3.
  • the cross section of this groove section 4 is also vertical symmetrical to the circumferential direction with respect to the radial direction Ri of the first cross section of the circumferential groove 1.
  • the second groove section 4 has a maximum width Bv,2,max of 7.5 mm.
  • the second groove section 4 also includes the bottom area 6 of the first cross section of the circumferential groove 1.
  • the bottom area 6 merges with a radius of curvature Rlv of 1.5 mm into straight sides of the second groove section 4, which run towards the radial direction Ri with increasing depth of the circumferential groove .
  • the value of the radius of curvature Rlv is between 0.8 mm and 2.5 mm, preferably between 1 mm and 2 mm and particularly preferably between 1.3 mm and 1.7 mm.
  • the second groove section 4 opens at an angle Alv of 120° with increasing depth of the circumferential groove. In the example shown, the second groove section 4 then opens up to the maximum width Bv,2,max.
  • the opening angle Alv of the second groove section 4 is typically 90° to 180°, preferably 110° to 160° and particularly preferably 115° to 140°.
  • the height H2v of the second groove portion 4 is 6.5 mm.
  • the height H2v of the second groove section 4 is typically 40% to 70% of the profile depth PT of the circumferential groove, preferably 45% to 65% of the profile depth PT and particularly preferably 50% to 60% of the profile depth PT.
  • the height H2v of the second groove section 4 is 2.4 mm to 12.5 mm, preferably 3.6 mm to 10.5 mm and particularly preferably 5 mm to 8.5 mm.
  • the height Hlv of the first groove section 3 of the first cross section is typically between 20% and 60% of the tread depth PT, preferably 25% to 55% of the tread depth PT and particularly preferably 35% to 50% of the tread depth PT.
  • the height Hlv of the first groove section 3 is 1.2 mm to 10.8 mm, preferably 2 mm to 8.8 mm and particularly preferably 3.5 mm to 7 mm.
  • a third groove section 5 adjoins the first groove section 3 of a first cross section outwards in the radial direction Ri.
  • This groove section 5 thus extends in the radial direction Ri from the first Groove section 3 up to the tread surface.
  • the width of the third groove section 5 steadily decreases with increasing distance from the surface of the tread 2 from the width Bv,o of the first cross section on the surface of the tread 2 to the width Bv,i of the first groove section 3 .
  • the sides of the cross-sectional area of the third groove portion 5 form straight lines perpendicular to the circumferential direction.
  • the width Bv,o in the axial direction A of the first cross section of the circumferential groove on the surface of the tread strip 2 is 4 mm in the exemplary embodiment when the pneumatic vehicle tire is new.
  • the width Bv,o of the first cross section on the surface of the first tread strip 2 when the pneumatic vehicle tire is new is typically 1.5 mm to 7 mm, preferably 3mm to 6mm and more preferably 3.5mm to 5mm.
  • FIG. 2 a second cross section of a circumferential groove is shown, in which sections are alternately present over the entire circumference of the tire, which have a first cross section shown in FIG. 1 and a second cross section shown in FIG. 2 .
  • FIGS. 1 and 2 are known from the prior art.
  • the cross section of a circumferential groove shown in FIG. 2 is symmetrical to a radial direction R2 and has a V-shaped cross section 13 .
  • the two sides of the cross section perpendicular to the circumferential direction run towards the radial direction R2 with increasing depth.
  • the cross section has a bottom area 14 which is formed by a surface along the axis direction A.
  • FIG. As already described, such a cross-section is very well suited to absorbing road water when it is wet and thus improving braking performance in the wet.
  • FIG. 3 shows a section of a tread strip 2 of a pneumatic vehicle tire that is known from the prior art.
  • Two parallel peripheral grooves 1 are shown here, which have both the first cross section shown in FIG. 1 and the second cross section shown in FIG.
  • the partial sections 21 of the two circumferential grooves have the first cross section shown in FIG. 1, while the partial sections 22 in the two circumferential grooves have the V-shaped second cross section shown in FIG.
  • the two cross sections there is a transition area 23 in the circumferential direction, in which the two cross sections merge into one another.
  • the partial sections of the first cross section and the second V-shaped cross section 21, 22 are in two parallel running Circumferential grooves arranged in the circumferential direction at the same place.
  • the alternating arrangement of both cross-sections both in the circumferential direction of the grooves and in the case of parallel grooves in the axial direction A means that both a favorable rolling resistance and a favorable wet behavior are used evenly over the tread surface.
  • FIG. 4 shows another embodiment of how a first cross section of a circumferential groove 1 can be configured.
  • the cross section has only two groove sections.
  • the third groove section 5 has been omitted and the height of the first groove section 3 in the radial direction Ri has been increased. Whilst all other proportions of the cross section shown in FIG. 1 are also present in a cross section of FIG. This is now in the width of the first groove section.
  • the width Bv,o at the surface of the tread strip 2 in the cross-section shown in Figure 4 is now 1.2 mm.
  • the first cross section is only the first and second has groove section
  • the width Bv,i of the first groove section 3 is also the width Bv,o of the cross section on the surface of the tread strip 2.
  • Figures 1 and 4 now show exemplary embodiments of a first cross section which also applies to the circumferential grooves 1 of a Vehicle pneumatic tires may be present.
  • an improved geometry of the cross section is used for the second cross section of the circumferential grooves 1 of a pneumatic vehicle tire according to the invention.
  • FIG. 5 shows the second cross section of a circumferential groove 1 belonging to a first embodiment of a pneumatic vehicle tire according to the invention.
  • the cross-section shown has a first groove section 33 which widens steadily outwards.
  • a second groove section 34 adjoins inward in the radial direction R2.
  • the constant width By.2 of the second groove section 34 is 3 mm.
  • the height of the second groove portion in the radial direction R2 is 4.55 mm. Due to the fact that the width of the second groove section 33 increases continuously, starting from the second groove section, towards the surface of the tread strip 2, the cross section of the first groove section has sides which are given by straight lines.
  • FIG. 6 shows a section of a tread of the first embodiment of a pneumatic vehicle tire according to the invention.
  • a circumferential groove 1 which has a partial section 21 with the first cross section shown in FIG. 1 and a partial section 24 with the second cross section shown in FIG.
  • the first groove section 33, the second groove section 34 and the bottom area 37 of the second cross section can be clearly seen on the front cross-sectional area.
  • FIG. 7 shows the second cross section of a circumferential groove of a second embodiment of the pneumatic vehicle tire according to the invention. It is repeated that the first cross-section of the circumferential groove has a cross-section as shown in Figures 1 and 4, for example.
  • the second cross section has a first groove section 33 , a second groove section 34 and a bottom area 37 .
  • the geometry and the dimensions of the second groove area 34 and the bottom area 37 are unchanged compared to the cross section of the first embodiment shown in FIG.
  • a fourth groove section 36 adjoins the first groove section 33 on the outside toward the surface of the tread strip 2 .
  • the fourth groove section 36 has a constant width By,o in the axial direction A.
  • the height HI.Y of the first groove section 33 in the radial direction R2 is 3.9 cm and the height HIY of the fourth groove section 33 is 2.05 cm.
  • the two straight lines of the sides of the cross-sectional area of the first groove portion 33 are inclined to each other so that they enclose an angle Aly of 80°. In other embodiments, the angle of inclination of the two sides to one another can typically be 30° to 180°, preferably 50° to 150° and particularly preferably 75° to 120°.
  • FIG. 8 shows a section of a tread strip 2 of the second embodiment of a pneumatic vehicle tire according to the invention.
  • this section of tread 2 there is a circumferential groove 1.
  • a partial section 24 of the circumferential groove 1 is also shown, which has the second cross section shown in FIG. 7 .
  • the components of the second cross section of the circumferential groove 1 are visible in particular at the front end of the tread section.
  • the fourth groove section 36 has a constant width in the axial direction A.
  • the fourth groove section 36 has a constant width in the axial direction A.
  • FIG. 9 shows the second cross section of a circumferential groove 1 belonging to a third embodiment of a pneumatic vehicle tire according to the invention.
  • the circumferential groove 1 has a further first cross section, which can be, for example, a cross section that is shown in FIGS.
  • the second cross section in Fig. 9 perpendicular to the circumferential direction is made up of a first groove section 33, a second groove section 34 adjoining inwards, a bottom region 37 of the second cross section adjoining the second groove section 34 inwards, and a fourth groove section 36. which adjoins the first groove section 33 outwards in the radial direction R2 towards the tread surface.
  • the geometry and dimensions of the second groove portion 34 and the bottom portion 37 correspond to those of the first embodiment shown in FIG.
  • the width in the axial direction A increases steadily with a smaller distance from the tread surface. Accordingly, the sides of this groove section are initially formed by straight lines. The straight lines on the two sides form an angle Aly of 145°.
  • the first groove section 33 has a curvature in the area which has the smallest distance from the tire surface. The radius of curvature R3y of this curvature is 1.5 mm.
  • the angle is AIY, which the two straight lines of the sides of the first groove section 33 include, typically between 110° and 180°, preferably between 125° and 165° and particularly preferably between 135° and 155°.
  • the radius of curvature R3y of the first groove section 33 is typically between 0.8 mm and 6 mm, preferably between 1.2 mm and 4 mm and particularly preferably between 1.35 mm and 3 mm.
  • the width of the fourth groove section 36 which adjoins the first groove section 33 on the outside and ends at the surface of the tread strip 2, also increases steadily in the axial direction A up to the width By,o at the surface of the tread strip 2.
  • the sides of the cross-sectional area of the fourth groove section 36 perpendicular to the circumferential direction are formed by straight lines. In the exemplary embodiment shown, the angle A2y between the straight lines on the sides is 42°. In other embodiments with the geometry of FIG.
  • the angle A2y of the straight lines of the sides of the fourth groove section 36 can typically be between 0° and 90°, preferably between 10° and 60° and particularly preferably between 30° and 50°.
  • the height Hly of the groove portion 33 is 2.25 mm.
  • the height H2y of the second groove portion 34 in the radial direction R2 is 5.17 mm.
  • the height H4y of the fourth groove portion 36 is 3.08 mm.
  • the second cross-section of which has the same geometry as shown in Figure 9 the height Hly of the first groove section 33 and the height H4y of the fourth groove section 36 are adapted to the choice of the angles Aly and A2y between the sides of the groove sections.
  • the total height in the radial direction R2 of the first groove section 33 and the fourth groove section 36 is typically 4 mm to 6.5 mm, preferably 4.5 mm to 6 mm and particularly preferably 5 mm to 5 mm .5mm.
  • FIG. 10 shows a section of a tread strip 2 of the third embodiment of a pneumatic vehicle tire according to the invention.
  • a circumferential groove 1 is also shown in this detail.
  • a partial section 21 of the circumferential groove 1 can be seen in the circumferential direction with a first cross section, as shown in FIG. 1 .
  • a partial section 24 of the circumferential groove 1 in the circumferential direction which has the second cross section shown in FIG. 9 .
  • At the bottom of the cross section are while the first groove section 33, the second groove section 34, the groove bottom 37, and the fourth groove section 36 of this cross-section can be seen.
  • a transition area 23 is also shown, in which the first cross section of the circumferential groove 1 merges into the second cross section of the circumferential groove.
  • FIG. 11 shows a circumferential groove 1 of a fourth embodiment of a pneumatic vehicle tire according to the invention.
  • its cross section is shown perpendicular to the circumferential direction of the tire.
  • This is the second cross section of the circumferential groove 1.
  • the circumferential groove has a first cross section, as is shown in FIGS. 1 and 4 by way of example. Shown is the outwardly widening first groove section 33.
  • the second groove section 34 then adjoins inward in the radial direction R2. This has a width By, 2 of 1.2 mm.
  • the width in the axial direction increases steadily from the width By,2 of the groove section 34 to the width By,o on the surface of the tread strip 2, which is 11 mm when the pneumatic vehicle tire is new.
  • the height of the Hly of the first groove portion 33 is 5.57 mm.
  • the height H2y of the second groove portion 34 is 3.43 mm.
  • a third groove section 35 adjoins the second groove section 34 inward in the radial direction R2, which includes the bottom region 37 of the second cross section and is teardrop-shaped.
  • the cross section of the third groove portion 35 perpendicular to the circumferential direction is circular and has a diameter By.s of 3 mm.
  • the lowest point 38 of the second cross section is located in the bottom area 37 encompassed by the third groove section 35 .
  • FIG. 12 shows a section of a tread strip 2 of the fourth embodiment of the pneumatic vehicle tire according to the invention.
  • a circumferential groove 1 is located in the cutout.
  • a partial section 21 of the circumferential groove 1 is shown, which has the first cross section that is shown in FIG.
  • a portion 24 of the circumferential groove having the second cross section shown in FIG.
  • FIG. 13 shows the second cross section of a circumferential groove 1 belonging to a fifth embodiment of a pneumatic vehicle tire according to the invention.
  • the first cross section of this circumferential groove 1 can in turn be the cross section shown in FIG. 1 or the cross section shown in FIG.
  • the second cross section has four groove sections.
  • the first groove portion 33 and the fourth groove portion 36 correspond to the first groove portion 33 and the fourth groove portion 36 of the third embodiment shown in FIG. 9 .
  • the second groove portion 34 and the third groove portion 35 of the fifth embodiment correspond to the second groove portion 34 and the third groove portion 35 of the fourth embodiment shown in FIG. Accordingly, the geometry and dimensions are the same for both embodiments.
  • FIG. 14 shows the second cross section of a circumferential groove 1 of a sixth embodiment of a pneumatic vehicle tire according to the invention.
  • the cross section has a first groove section 33, a second groove section 34 adjoining inward in the radial direction R2, a third groove section 35 adjoining this inward in the radial direction R2, and a fourth groove section 36, which extends in the radial Towards the outside in the first groove portion 33 connects.
  • the geometry and widths of the second groove portion 34 and the third groove portion 35 of the sixth embodiment are the same as those of the fourth embodiment shown in FIG.
  • the height H2y of the second groove portion 34 is 4.1 mm.
  • the first groove portion 33 increases in width in the axial direction A from the width BY imin which is 5.4 mm to a width By max which is 8 mm with decreasing distance from the surface of the tread 2. Since the minimum width Bv imin of this groove section larger than the width of the second groove section By, 2, the first groove section 33 has an area in the axial direction A, which has the width By imin. The first groove section 33 widens from this surface by bending the sides. The fourth groove section 36 closes outwards in the radial direction R2. In this groove section, the width in the axial direction A increases steadily from the width By.imax to the width By,o on the surface of the tread strip 2, which is 11 mm.
  • FIG. 15 shows a section of the tread strip 2 of the first embodiment of a pneumatic vehicle tire according to the invention.
  • a circumferential groove 1 is shown, with an entire partial section 21 of the circumferential groove 1 being shown in the circumferential direction, which has the first cross section as shown in FIG.
  • This section 21 has a length Liv of 80 mm in the circumferential direction.
  • the length of a section 21 of a circumferential groove in a pneumatic vehicle tire according to the invention with a first cross section is usually 25 mm to 120 mm, preferably 40 mm to 100 mm and particularly preferably 60 mm to 90 mm.
  • FIG. 16 shows a further section of the tread strip 2 of the first embodiment of a pneumatic vehicle tire according to the invention, in which a circumferential groove 1 is located.
  • This detail shows an entire partial section 24 of the circumferential groove 1, in that it has the second cross section shown in FIG. Parts of subsections 21 of the circumferential groove 1 can also be seen, in which they have the first cross section shown in FIG.
  • the transition area 23 between the first and second cross section of the circumferential groove 1 is shown.
  • the first cross section of the circumferential groove shown in FIG. 1 is shown again, with the first groove section 3, the second groove section 4 and the third groove section 5 being visible in particular.
  • the distance Liy is also shown, which shows the distance between two partial sections 21 with the first cross section in the circumferential direction. Going back now to FIG. 15, the complete partial section 21 of the first cross section of the circumferential groove 1 is shown there. In addition, parts of the partial sections 24 of the circumferential groove are shown, which have the second cross section shown in FIGS. 5 . At the lower end of the section, the second cross section can be seen again clearly, in particular the first groove section 33, the second groove section 34 and the bottom area 37 of the second cross section of the circumferential groove 1. Next are the Section lines A, A', B, B', and C, C' in axis direction A are shown in FIG.
  • FIG. 1 shows the cross section through the circumferential groove 1 along the line A, A', the cross section through the first cross section of the circumferential groove 1.
  • the cross section along the line B, B' is shown in FIG. This cross section is in the transition area between the two cross sections of the circumferential groove 23. It can be seen from FIG. 2 that the cross section in the transition area is V-shaped.
  • FIG. 5 shows the cross section along the line C, C′, which is a cross section through the second cross section of the circumferential groove 1 .
  • Also shown in Fig. 16 is the cross-sectional line D, D'. This cross-sectional line runs along the circumferential groove and the cross-sectional area thereof is perpendicular to the axis direction A.
  • the cross-section along the line D, D' along the circumferential groove is shown in FIG.
  • the tread 2 of the pneumatic vehicle tire is shown, with the surface of the tread being at the top.
  • the distance Lly is shown here, which describes the distance between two partial sections with the first cross section, which in the exemplary embodiment shown corresponds to the length Liv of the partial section 21 in the circumferential direction.
  • the length L2y is also shown, which corresponds to the length of the partial section 24 with the second cross section in the circumferential direction, including the length of the two adjacent transition areas 23 in the circumferential direction, in which the narrowed second groove section of the second cross section is still completely present. This length is 42 mm .
  • the length L2y is typically 8 mm to 110 mm, preferably 25 mm to 80 mm and particularly preferably 35 mm to 50 mm.
  • the length L3y is also shown, which describes the length in the circumferential direction of a transition area 23 between the first and second cross section, over which the narrowed second groove section of the second cross section is not present or not completely present. In the exemplary embodiment shown, it is 19 mm.
  • the length L3y of the transition area 23 is typically 5 mm to 35 mm, preferably 10 mm to 30 mm and particularly preferably 15 mm to 25 mm.
  • FIG. 17 shows the section 24 of the circumferential groove 1 which has the second cross section.
  • FIG. 18 now shows the same section of the pneumatic vehicle tire according to the invention when the pneumatic vehicle tire makes contact with a road surface 40 when it is wet. It should be noted that in Figures 17 and 18 the top and bottom have been reversed.
  • the improved structure of the second cross section in the sections 24 significantly reduces the rolling resistance in these sections compared to the prior art.
  • the pneumatic vehicle tire according to the invention therefore has both very good wet performance and low rolling resistance.
  • the rolling resistance is therefore optimized without any significant loss of safety. This optimization of the rolling resistance, ie minimizing the rolling resistance, can reduce the fuel consumption of the vehicle that is equipped with the pneumatic vehicle tires according to the invention and correspondingly also the CO2 emissions of this vehicle.
  • the partial section 21 of the first cross section is located in a circumferential groove
  • the partial section 24 of the second cross section is located in the second circumferential groove and vice versa.
  • FIGS. 20 and 21 show an even larger section of the tread strip 2 both in the circumferential direction and over the width of the complete tread strip 2 .
  • This distribution of the sections 21 and 24 on the parallel circumferential grooves 1 distributes the properties of the tread 2 of the pneumatic vehicle tire according to the invention evenly over the circumference and the width of the pneumatic vehicle tire. In all positions of the tread strip 2 there is good wet performance and low rolling resistance.
  • the tread 2 of the pneumatic vehicle tire is shown over the entire width of the tread 2 in FIGS.
  • the tread 2 has a total of four circumferential grooves.
  • the second groove section 4 of the first cross section is then located on the surface of the tread strip 2 in these subsections Pneumatic vehicle tires have good wet performance and low rolling resistance.
  • the nominal width of the pneumatic vehicle tires according to the invention is typically 280 mm to 460 mm, preferably 290 mm to 400 mm and particularly preferably 300 mm to 330 mm. In the embodiments shown in the figures, the nominal width of the pneumatic vehicle tire shown is 315 mm. The nominal width of vehicle tires is defined according to the ISO 5775 standard.
  • the nominal cross-sectional ratio i.e. the ratio of the tire height to the nominal width in %, is typically 40% to 95% for pneumatic vehicle tires according to the invention, preferably 45% to 80% and particularly preferably 50% to 70%. In the embodiments of the figures, the ratio of tire height to nominal width is 70%.
  • the pneumatic vehicle tires according to the invention typically have 2 to 6 grooves, preferably 3 to 5 grooves and particularly preferably 4 circumferential grooves.
  • the pneumatic vehicle tires according to the invention are used on wheels which preferably have a rim diameter of 19.5 inches and particularly preferably a rim diameter of 22.5 inches.
  • the pneumatic vehicle tires according to the invention are preferably used on buses and trucks. They are used for light trucks, preferably for medium-duty trucks, in particular with a total weight of more than 7.2 tons and most preferably for heavy trucks.
  • the pneumatic vehicle tires according to the invention are used in particular for the steering wheels and trailer wheels.
  • Pneumatic vehicle tires according to the invention can have the features of individually described embodiments of a pneumatic vehicle tire according to the invention or a combination of the features of different described embodiments. This in particular since the described embodiments only represent examples of the pneumatic vehicle tires according to the invention for explaining the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

L'invention concerne un pneu de véhicule à rainure périphérique qui comporte une bande de roulement (2) présentant une sculpture, ladite bande de roulement ayant au moins une rainure périphérique (1) s'étendant dans la direction périphérique du pneu de véhicule, réalisée sur une profondeur de sculpture PT, la rainure périphérique présentant en alternance sur l'ensemble de la circonférence du pneu, sur des segments partiels (21, 24) de la circonférence du pneu de véhicule, une première section transversale perpendiculairement au sens périphérique et une seconde section transversale perpendiculairement au sens périphérique. La première section transversale se compose d'au moins deux parties de rainure contiguës dans une première direction radiale R1 du pneu de véhicule, d'une première partie de rainure (3) qui est symétrique à la première direction radiale R1 et dont la largeur BV,1 est inférieure à 3 mm et ne varie pas plus de 10% dans la direction axiale A du pneu de véhicule, et d'une seconde partie de rainure (4) élargie par rapport à la première rainure (3) dans la direction A et présentant la surface de section transversale la plus importante de toutes les parties de rainure. La seconde section transversale se compose d'au moins deux parties de rainure contiguës dans une seconde direction radiale R2 du pneu de véhicule et symétriques à la direction radiale R2, d'une première partie de rainure (33) s'élargissant vers l'extérieur et d'une seconde partie de rainure (34) intérieure qui est diminuée par rapport à la première partie de rainure et dont la largeur BY,2 ne varie pas de plus de 10% dans la direction axiale A du pneu de véhicule et est inférieure à 40% de la largeur Y,O dans la direction axiale A de la seconde section transversale, au niveau de la surface de la bande de roulement à l'état neuf du pneu de véhicule. A cet effet, la seconde partie de rainure (34) de la seconde section transversale s'étend sur au moins 50% de la hauteur H2V de la seconde partie de rainure (4) de la première section transversale dans la direction radiale R1 dans la direction radiale R2 et présente sur au moins 50% de sa hauteur H2Y dans la direction radiale R2 une distance par rapport à la surface de la bande de roulement (2), à laquelle se situe la seconde partie de rainure (4) dans le cas de la première section transversale.
EP21823177.7A 2020-11-13 2021-11-09 Pneu de véhicule à rainure périphérique Pending EP4244081A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020214281.5A DE102020214281A1 (de) 2020-11-13 2020-11-13 Fahrzeugluftreifen mit Umfangsrille
PCT/DE2021/200185 WO2022100800A1 (fr) 2020-11-13 2021-11-09 Pneu de véhicule à rainure périphérique

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EP4244081A1 true EP4244081A1 (fr) 2023-09-20

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EP21823177.7A Pending EP4244081A1 (fr) 2020-11-13 2021-11-09 Pneu de véhicule à rainure périphérique

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US (1) US20240025213A1 (fr)
EP (1) EP4244081A1 (fr)
CN (1) CN116438086A (fr)
DE (1) DE102020214281A1 (fr)
WO (1) WO2022100800A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115284790B (zh) * 2022-06-20 2024-03-26 山东玲珑轮胎股份有限公司 一种湿地低阻防滑轮胎
JP2024066540A (ja) * 2022-11-02 2024-05-16 住友ゴム工業株式会社 重荷重用タイヤ

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2322505A (en) * 1943-06-22 Pneumatic tire
JP2774775B2 (ja) * 1993-08-23 1998-07-09 住友ゴム工業株式会社 空気入りタイヤ
KR20090053384A (ko) * 2007-11-23 2009-05-27 한국타이어 주식회사 방열기능을 향상시킨 자동차용 타이어
FR2971732B1 (fr) * 2011-02-17 2013-02-01 Michelin Soc Tech Bande de roulement pour pneumatique poids lourd de type remorque et element moulant
FR3014022B1 (fr) * 2013-12-02 2016-07-08 Michelin & Cie Bande de roulement evolutive pour pneu
DE102015215455A1 (de) 2015-08-13 2017-02-16 Continental Reifen Deutschland Gmbh Fahrzeugluftreifen
FR3049896A1 (fr) 2016-04-08 2017-10-13 Michelin & Cie Bande de roulement de pneu
FR3049897A1 (fr) 2016-04-08 2017-10-13 Michelin & Cie Bande de roulement amelioree pour pneu
WO2017176280A1 (fr) * 2016-04-08 2017-10-12 Compagnie Generale Des Etablissements Michelin Bande de roulement de pneu de camion et pneu de camion
FR3111292B1 (fr) * 2020-06-10 2022-08-26 Michelin & Cie Bande de roulement de pneumatique pour un véhicule poids lourd avec une résistance aux agressions améliorée

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WO2022100800A1 (fr) 2022-05-19
CN116438086A (zh) 2023-07-14
DE102020214281A1 (de) 2022-05-19
US20240025213A1 (en) 2024-01-25

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