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
  • B60C11/0306—Patterns comprising block rows or discontinuous ribs
• • 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
  • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
  • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
• • 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
• • 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
  • B60C2011/0386—Continuous ribs
  • B60C2011/0388—Continuous ribs provided at the equatorial plane
• • 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
  • B60C2011/0386—Continuous ribs
  • B60C2011/039—Continuous ribs provided at the shoulder portion
• • 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
  • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
  • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
  • B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface

Definitions

• the present invention relates to a tread of a tire for a motor vehicle provided with means for substantially reducing the rolling noise.
• tires for passenger vehicles are provided with a carcass reinforcement which today is radial for the most part; in this configuration, the reinforcements of the carcass reinforcement are arranged to make an angle greater than or equal to 80 degrees and less than 100 degrees with a circumferential direction.
• the tires are provided with a crown reinforcement comprising a plurality of reinforcements embedded in a material based on elastomers.
• This crown reinforcement is covered radially on the outside by a tread made of rubber material, this strip having a surface, called a tread surface, intended to be in contact with the road while driving.
• a disadvantage of the presence of longitudinal grooves is the generation of vibrations of the air flowing in these grooves, especially in the area of contact with the road. These vibrations are the source of resonances generating a rolling noise.
• EP0324605 discloses a tread having a plurality of blocks aligned in a circumferential direction.
• the blocks are inclined at a certain angle on the running surface in order to reduce the generation of noise while taxiing.
• a tread comprising a tread surface, the tread surface having two shoulders areas surrounding a central area.
• the shoulder areas comprise a plurality of transverse incisions succeeding one another in a circumferential direction. These transverse incisions are intended in particular to improve the adhesion on wet ground.
• the inventors have observed that these transverse incisions generate noises of significant intensity when they penetrate into the area of contact with the ground during travel.
• tread noise including noises generated at shoulder areas of this tread.
• Thread of a tire means a quantity of rubber material delimited by side surfaces and by two major surfaces, one of which is intended to come into contact with a roadway when the tire is rolling.
• Tread surface means all the points of the tread which are in contact with the roadway when the tire, inflated to its reference pressure, is rolling on that roadway.
• the reference inflation pressure is defined in the conditions of use of the tire as defined in particular by the standard E.T.R.T.O. ("European Tire and Rim Technical Organization").
• block on a tread means a relief element delimited by grooves and comprising side walls and a contact face, the latter being intended to come into contact with the ground during a period of time. rolling.
• extended block means a block having a width and a length on the circumference of the tire, this length being much greater than the width.
• Rab means an elongated block which extends over the entire circumference of the tire.
• groove is meant a cut in the tread delimiting material walls, the width of this cutout is such that the walls associated with this cutout can not come into contact one against the other under normal driving conditions.
• the width for a groove is greater than 2 millimeters.
• “Incision” means a cut in the tread delimiting material walls, the width of this cutout is appropriate to allow the contact, at least partially, the walls of the incision during the passage in the contact area between the tire and the ground.
• the width for an incision is less than or equal to 2 millimeters.
• transverse direction or "axial direction” means a direction parallel to the axis of rotation of the tire.
• Circumferential direction means a direction that is tangent to any circle centered on the axis of rotation. This direction is perpendicular to the axial direction.
• oblique direction is meant a direction which has an axial component and a non-zero circumferential component.
• circumferential level is meant a set of points forming a line, this line being perpendicular to the circumferential direction.
• circumferential level is meant a set of points forming a straight line, this straight line being perpendicular to the circumferential direction.
• Midplane means a plane perpendicular to the axis of rotation of the tire and passing through the middle of the tread.
• the invention relates to a rubber tire comprising a tread.
• the tread has a width W measured between two edges of the tread, the tread comprising a tread surface intended to come into contact with a ground, the tread surface comprising two shoulder zones surrounding a central zone. At least one of the two shoulder zones comprises a plurality of cutouts succeeding one another in a circumferential direction. All or part of the cutouts of the plurality of cuts extends obliquely, each cutout having two ends, and in that when a cut reaches one of its ends, another cutout starts at the same circumferential level in the shoulder zone. .
• the invention thus proposes to ensure continuity in the organization of the cutouts in the shoulder zone. Indeed, when a cut reaches one of its ends, another cut starts at the same circumferential level. In this way, the variation of the notching rate of the shoulder zone is limited in the circumferential direction and the acoustic performance of the tire is then improved.
• the oblique cutouts are at an angle with a transverse direction.
• the angle a is between 5 degrees and 60 degrees.
• the angle is between 15 degrees and 45 degrees.
• the oblique cutouts are extended by generally transverse cutout extensions. These extensions cutting edges extend from the oblique cut-outs to an edge of the tread, and in that the length of the cut-out extensions is less than 10% of the width W of the tread.
• transverse cutout extensions limit the noise generated when taking turns, ie when there is a load transfer from the center of the tread to one of the shoulder areas.
• the oblique cutouts open into a circumferential groove belonging to the central area of the running surface.
• each shoulder zone comprises a series of oblique cuts and in that the cutouts of the two shoulder areas are symmetrical with respect to a median plane.
• cutouts are then particularly suitable for use in directional sculptures.
• each shoulder zone comprises a series of oblique cuts and in that the cutouts of the two shoulder areas are unsymmetrical with respect to a median plane.
• cutouts are then particularly suitable for use in non-directional sculptures.
• the two series of oblique cuts are offset from one another in the circumferential direction.
• Noise coupling between the two series of cutouts is avoided. This prevents the cutouts of the two series of cuts simultaneously in contact with the ground and thus improves the overall acoustic performance of the tire.
• the cutouts are incisions.
• the cutouts are grooves.
• the central region of the tread comprises at least one elongate block in the circumferential direction.
• the elongate block has a contact surface for contacting a floor and a first side wall and a second side wall defining the contact surface.
• the elongate block has a plurality of cutouts opening on the contact surface of the block. Each cutout extends in an oblique direction, opening onto the first side wall and the second side wall.
• the cutouts of the block are oriented in the same direction and the cutouts are distributed over the contact surface of the elongated block so that when a cutout reaches the second side wall another cut starts from the first side wall, at the same level. circumferential on the elongated block.
• the central zone comprises at least one elongate block in the circumferential direction (X) of width W and length L with L »W, the elongate block comprising a contact surface intended to come into contact with a floor and a first side wall and a second side wall defining the contact surface.
• the elongate block has a plurality of oblique cutouts opening alternately on the first side wall or on the second side wall and extending to ends of cuts that do not open on said side walls. The cutouts of the plurality of cutouts are distributed over the contact surface of the block so that when a cutout reaches its cutout end another cutout starts from a sidewall at the same circumferential level on the elongated block.
• the central zone comprises at least one elongated block in the circumferential direction of width W and length L with L »W, the elongated block comprising a contact surface intended to come into contact with a floor and a first side wall and a second side wall defining the contact surface.
• the elongated block has a plurality of cutouts opening on the contact surface of the elongate block. The cutouts extend obliquely from the first sidewall toward the second sidewall to cutout ends. For at least one cutout, its end does not open on the second sidewall and when this cutout reaches its cutout end another cutout starts from the first sidewall at the same circumferential level on the elongated block.
• FIG. 1 schematically represents a partial view of a tread comprising incisions, according to a first embodiment of the invention
• Figure 2 schematically shows a second embodiment of the invention with incisions
• Figure 3 schematically shows a third embodiment of the invention with incisions
• Figure 4 schematically shows a fourth embodiment of the invention with incisions
• Figure 5 shows schematically a fifth embodiment of the invention with incisions
• Figure 6 shows schematically a sixth embodiment of the invention with incisions
• Figure 7 shows schematically a seventh embodiment of the invention with incisions
• Figure 8 shows schematically an eighth embodiment of the invention with incisions
• Figure 9 shows schematically a ninth embodiment of the invention with incisions
• Figure 10 shows schematically a partial view of a tread having grooves, according to a tenth embodiment of the invention
• Figure 11 shows schematically an eleventh embodiment of the invention with grooves
• Figure 12 shows schematically a
• Figure 1 and Figure 10 respectively show a partial view of a tread 1 of a tire according to a first embodiment of the invention.
• the tread 1 comprises a tread surface 5 intended to come into contact with a ground.
• This running surface has a width C, width measured between two edges 3 of the tread.
• the running surface comprises two shoulder zones 7a, 7b surrounding a central zone 9.
• shoulder zones it is meant the areas of the running surface which are located near the edges 3 of this tread.
• the shoulder areas 7a, 7b are here constituted by two elongated blocks in a circumferential direction X.
• At least one of the shoulder areas comprises a plurality of cutouts 11a, 11b.
• the cutouts 11a, 11b are incisions.
• the cutouts 11a, 11b are grooves. These cuts follow one another in the circumferential direction X.
• Each cut-out extends between two ends 13a, 13a at an angle ⁇ , which is not zero, with a transverse direction Y.
• the angle a is here between 5 degrees and 60 degrees. degrees and preferably between 15 degrees and 45 degrees.
• the cutouts 11a, 1b are remarkable in that when the cutout 11a reaches one of its ends 13b, another cutout 11b starts at the same circumferential level N in the shoulder zone 7a.
• the notion of neutral fiber is used for determining the same circumferential level between two adjacent grooves. The neutral fiber of a groove divides this groove into two grooves having substantially the same volume.
• the cut-outs 11a, 11b here have a simple rectilinear shape.
• these cutouts 11a, 11b may form curved traces on the surface of the tread, or more complex traces may comprise different segments having different inclinations or may comprise different curves having different curvatures.
• the angle a is determined between the straight line passing through the two ends 13a, 13b and corresponding to an average trace of the cutout, and the transverse direction Y.
• the end 13a of the cutout l ia does not open here on the edge 3 tread. More particularly, the distance between this end 13a and this edge is greater than 0 and less than 10% of the width C of the tread. In this way, even if the conditions of use of the tire vary (load, inflation pressure), one keeps a coincidence of the cuts at the same circumferential level N in the tread.
• the oblique cut-out 11a is extended at its end 13a by a generally transverse cutout extension extending to the edge 3 of the web. rolling.
• generally transverse is meant that the cutout extension is at an angle less than 5 degrees with the transverse direction Y.
• the length L of the cutout extension is greater than 0 and less than 10% of the width C of the band of rolling.
• the cutout extensions extend beyond the edge 3 of the tread.
• FIG. 3 and FIG. 12 describe a particular embodiment in which the cutouts 11a, 11b open into a circumferential groove 4 belonging to the central zone 9 of the rolling surface 5.
• FIGs 4 to 6 and Figures 13 to 15 describe embodiments in which each shoulder zone 7a, 7b comprises a series of cutouts 17, 19.
• the series of cuts 17, 19 are symmetrical with respect to a median plane 18.
• the cutouts 17, 19 of the two shoulder areas are not symmetrical relative to this median plane 18.
• the series of cuts 17, 19 are offset from each other in the circumferential direction. This offset 20 is, for example, between 5 and 10 mm. Such an offset can take place in the case where the series of cutouts 17, 19 are symmetrical (FIG. 4, FIG. 6, FIG. 13 and FIG.
• Figures 7 to 9 and Figures 16 to 18 describe embodiments in which the central area 9 of the tread comprises at least one elongate block 21.
• This elongate block is provided with a plurality of cutouts 29a. , 29b.
• the cutouts 29a, 29b are distributed over the contact surface of the elongated block so that when a cutout 29a reaches a second side wall 27 of the elongated block, another cutout 29b starts from a first side wall 25 of this elongated block, at the same circumferential level M on the elongated block.
• the cutouts 29a and 29b are interrupted and extend respectively to the ends of cuts. Each cutout end is aligned with the intersection of another cutout and a sidewall of the elongate block. In FIG. 8 and in FIG. 17, the cutouts open alternately on the first side wall 25 or on the second wall In FIG. 9 and in FIG. 18, the cutouts open on one and the same first lateral wall 25.
• the series of cutouts present in the shoulder areas are circumferentially offset from the cutouts present in the elongate block.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=53801009

Family Applications (1)

Country Status (7)

Families Citing this family (9)

Family Cites Families (10)

• 2015
  • 2015-05-07 FR FR1554096A patent/FR3035823A1/fr not_active Ceased
• 2016
  • 2016-05-04 JP JP2017558493A patent/JP2018514453A/ja active Pending
  • 2016-05-04 CN CN201680025978.0A patent/CN107531100A/zh active Pending
  • 2016-05-04 BR BR112017023887A patent/BR112017023887A2/pt not_active Application Discontinuation
  • 2016-05-04 EP EP16723442.6A patent/EP3292005A1/de not_active Withdrawn
  • 2016-05-04 WO PCT/FR2016/051059 patent/WO2016177977A1/fr not_active Ceased
  • 2016-05-04 US US15/571,920 patent/US20180134089A1/en not_active Abandoned

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