WO2019035847A1 - Bandes de roulement de pneu comprenant des lamelles coniques et ondulées - Google Patents

Bandes de roulement de pneu comprenant des lamelles coniques et ondulées Download PDF

Info

Publication number
WO2019035847A1
WO2019035847A1 PCT/US2017/047632 US2017047632W WO2019035847A1 WO 2019035847 A1 WO2019035847 A1 WO 2019035847A1 US 2017047632 W US2017047632 W US 2017047632W WO 2019035847 A1 WO2019035847 A1 WO 2019035847A1
Authority
WO
WIPO (PCT)
Prior art keywords
tread
sipe
thickness
tire
undulations
Prior art date
Application number
PCT/US2017/047632
Other languages
English (en)
Inventor
Jason SCHOENMAKER
Sadi KOSE
Mark Collett
Jason Zychiewicz
Ting-Ting CHOMA
Original Assignee
Compagnie Generale Des Etablissements Michelin
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 Compagnie Generale Des Etablissements Michelin filed Critical Compagnie Generale Des Etablissements Michelin
Priority to PCT/US2017/047632 priority Critical patent/WO2019035847A1/fr
Publication of WO2019035847A1 publication Critical patent/WO2019035847A1/fr

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
    • B60C11/12—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
    • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
    • 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
    • B60C11/124—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern inclined with regard to a plane normal to the tread surface
    • 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
    • B60C11/1272—Width of the sipe
    • B60C11/1281—Width of the sipe different within the same sipe, i.e. enlarged width portion at sipe bottom or along its length
    • 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
    • B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface

Definitions

  • Embodiments of this disclosure relate generally to tire treads for tires.
  • Tires whether pneumatic or non-pneumatic, include a tread configured to develop traction (adherence) between the vehicle and a road surface.
  • these tire treads include sipes, which are very thin discontinuities extending within the tire tread.
  • Sipes are generally intended to close when arranged within in a tire contact patch (footprint) during tire rotation, the contact patch being the area of contact between the tire and a ground surface.
  • a groove is thicker than a sipe as it is intended to remain open during tire operation, such as to receive water and snow for the purpose of evacuating the same from the tire footprint to promote traction between the tire and the ground surface.
  • Particular embodiments of the disclosure provide a tire tread, the tire tread having a tread thickness extending from an outer, ground-engaging side and to a bottom side, the thickness extending in a direction perpendicular to both a length and a width of the tread, the width extending between a pair of lateral sides of the tread, where the tread length is greater than the tread width.
  • the tire tread also includes at least one sipe extending into the tread thickness along a depthwise path into the tread thickness away from an outer, ground- engaging side of the tread and to a terminal end.
  • the sipe has a thickness extending perpendicular to the depthwise path, the depthwise path being located midway across the sipe thickness, where a portion of the depthwise path undulates back and forth in a direction perpendicular to the direction of the tread thickness as the depthwise path extends into the tread thickness to form a plurality of undulations, the undulations decreasing in amplitude relative to a centerline of the depthwise path as the sipe extends further into the tread thickness towards the terminal end.
  • FIG. 1 is a top perspective view of a portion of a tire, showing a tire tread arranged along a tire carcass, in accordance with an exemplary embodiment
  • FIG. 2 is a side sectional view of the tire tread shown in FIG. 1 taken along line 2-2;
  • FIG. 3 is a side sectional view of a sipe in accordance with a particular variation of the sipe shown in FIG. 2;
  • FIG. 4 is a side sectional view of a depthwise path of the sipe shown in FIG. 2;
  • FIG. 5 is a graph showing the unexpected improvement in both vertical and transverse tread rigidity when employing sipes having tapering undulations
  • FIG. 6 is a side sectional view of a sipe in accordance with another particular variation of the sipe shown in FIG. 2;
  • FIG. 7 is a side sectional view of a sipe in accordance with a particular variation of the sipe shown in FIG. 2;
  • FIG. 8 is a side sectional view of an inclined sipe in accordance with a particular variation of the sipe shown in FIG. 2.
  • FIG. 9 is a front perspective view of a sipe molding member, for use in molding a sipe within a tire tread.
  • FIG. 10 is a front perspective view of a sipe molding member according to another embodiment where the sipe molding member is configured to form an area of reduced thickness within a sipe.
  • This disclosure provides improved sipe designs for improved manufacturing and performance.
  • demolding operations are improved.
  • demolding force is reduced, as is the risk of ratcheting and the tearing of blocks and ribs.
  • unexpected improvements in tread rigidity are also achieved.
  • the present disclosure concerns tire treads having sipes formed by molding, and sipe molding elements for forming such treads by molding. It is appreciated that the tire treads may be annularly molded when forming a new tire, or separately from any tire or tire carcass, such as when being molded within a flat or annular mold for retreading operations.
  • a tire tread according to the present disclosure includes a length, width, and a thickness.
  • the thickness extends from an outer, ground-engaging side of the tread and to a bottom side of the tread.
  • the thickness can be said to extend in a direction perpendicular to both the length and the width of the tread.
  • the direction of the tread thickness is a direction perpendicular to both the direction of the tread width and the direction of the tread length.
  • the direction of the tread thickness is also perpendicular to the outer, ground- engaging side.
  • the direction of the tread thickness extends in a radial direction at a widthwise centerline of the tire tread.
  • the widthwise centerline of the tread coincides with an equatorial centerplane of the tire tread.
  • the tread width extends between a pair of lateral sides of the tread. It can be said that the tread length is greater than the tread width.
  • the tread includes a plurality of tread elements arranged along the outer, ground-engaging side.
  • the void features comprise longitudinal grooves, and from time-to-time, lateral grooves which may intersect one or more longitudinal grooves. These grooves at least partially define these tread elements, which may form a continuous, annular rib or a tread block.
  • a rib is defined by either a pair of opposing longitudinal grooves or a longitudinal groove and the shoulder of the tread, each being spaced-apart from one another in a direction of the tread width (which is also referred to as a lateral direction).
  • Each tread block is described as having a leading side and a trailing side, each leading and trailing side extending into the tread thickness from the outer, ground- engaging side.
  • the leading side precedes the trailing side in a direction of forward tread rotation, such that the leading side approaches a surface upon which a tire is operating (a tire operating surface) before the trailing side for any such tread block.
  • each tread block has a pair of spaced apart lateral sides, that is, sides spaced is in a general direction of the tread width. The pair of lateral sides define a width of the tread block, while the leading and trailing sides define a length of the corresponding tread block.
  • Each lateral side extends into the tread thickness from the outer, ground-engaging side and is defined by (that is, formed by) either a longitudinal groove or a shoulder of the tread.
  • a shoulder of the tread is a free, exterior side edge arranged at or near a lateral side of the tread. The shoulder defines the widthwise extent of the outer, ground-engaging side of the tread, whereby the width of the outer, ground- engaging surface is defined by a pair of spaced apart shoulders.
  • a longitudinal groove and a shoulder each extend generally in the direction of the tread length.
  • any longitudinal groove or shoulder extends primarily in the direction of the tread length, such that in separating the direction into a pair of vectors, one extending in the direction of the tread length (longitudinal vector) and the other extending in the direction of the tread width (lateral vector), the longitudinal vector is greater than the lateral vector. It is appreciated that the lateral vector may be zero, such that a general direction of the tread length is the direction of the tread length.
  • the tire tread includes at least one sipe, and often a plurality thereof, extending into the tread thickness along a depthwise path from the outer, ground- engaging side of the tread and to a terminal end.
  • the sipe may extend direction from the outer, ground-engaging side, or may extend indirectly therefrom by extending from groove or other void arranged along the outer, ground-engaging side.
  • Any such sipe also has a length and a thickness, each extending perpendicular to the depthwise path and to one another, where the sipe thickness extends in a direction perpendicular to the sipe length.
  • the sipe length is greater than the sipe thickness.
  • the depthwise path is located midway across the sipe thickness.
  • At least a substantial portion of the depthwise path undulates back and forth in a direction perpendicular to the direction of the tread thickness as the depthwise path extends into the tread thickness to form a plurality of undulations.
  • a substantial portion of the depthwise path means that the plurality of undulations form at least 50% of the sipe height, where the height measures the depthwise extent of the sipe within the tire tread.
  • a substantial portion of the depthwise path forms is at least 75% of the sipe height.
  • the depthwise path undulates back and forth for less than a substantial portion of the sipe height, which, in certain exemplary instances, extends for at least 33% of the sipe height.
  • the undulations decrease in amplitude as the depthwise path extends away from the outer, ground-engaging side and closer to a terminal end of the sipe.
  • the sipe thickness is constant as the depthwise path extends into the tread thickness to the terminal end when the tread is arranged annularly around a tire in an installed arrangement for normal tire operation.
  • the sipe thickness increases as the depthwise path extends into the tread thickness to the terminal end when the tread is in a flat arrangement prior to being arranged annularly around a tire in an installed arrangement for normal tire operation.
  • the sipe thickness varies as the depthwise path extends into the tread thickness to the terminal end when the tread is arranged annularly around a tire in an installed arrangement for normal tire operation. Regardless, whether or not the sipe thickness remains constant or varies as the sipe extends depthwise into the tread thickness, the sipe thickness may remain constant and/or may vary along any extent of the sipe length.
  • An undulation is a back and forth change in direction of the sipe and its thickness along one side of a sipe centerline, the sipe centerline extending in the direction of the tread thickness.
  • the amplitude of each undulation is measured from the sipe centerline.
  • the amplitudes of the plurality of undulations decrease in a linear relation. In other instances, whether for a different sipe or for the same sipe at a different location along the sipe length, a plurality of undulations decrease in a non-linear relation.
  • the undulations may be constantly spaced, where the plurality of undulations are arranged in association with a constant period. In other variations, the plurality of undulations are arranged in association with a variable period. In any such variation, in certain instances, the plurality of undulations are arranged continuously in the direction of the tread thickness. What this means is that there is no interruption between undulations. Otherwise, linear segments or other void features may be arranged between undulations. In such instances, the plurality of undulations are arranged discontinuously in the direction of the tread thickness at one or more locations along the sipe length. It is appreciated that any single sipe may include any combination of each of these different features.
  • each undulation may take any desired form.
  • the undulations are smoothly contoured.
  • smoothly contoured undulations may form a sinusoidal wave with decreasing amplitudes, in one example.
  • the undulations are block-shaped or stepped.
  • the undulations are pointed, such as when forming a V- shape. It is appreciated that with regard to a plurality of undulations arranged along any sipe or depthwise path, any combination of differently shaped undulations may be included within the plurality.
  • any sipe contemplated herein may have a length that is at least 60% of the tread thickness, although any sipe contemplated herein may have a length that is greater or less than such length.
  • the sipe length extends at least halfway across a tread element. Because tread elements (ribs or blocks) are most flexible at any side (that is, along a free side), in certain instances, the sipe length extends from at least one side edge of a tread element.
  • the undulations along the depthwise path may extend continuously or discontinuously in any direction along the length of the sipe, where any such lengthwise extension may form any linear or non- linear path.
  • the sipe length extends along a lengthwise path that undulates back and forth in a direction perpendicular to the sipe length to form a second plurality of undulations.
  • the second plurality of undulations are arranged continuously or discontinuously along the sipe length.
  • One or more areas of reduced sipe thickness may be included within any sipe, where any such area may or may not be characterized as having extending along a depthwise path having tapering/diminishing undulations.
  • Tire 10 includes a tread 12 arranged overtop one or more belt plies 50 and one or more body (carcass) plies 60.
  • Tread 12 includes various void features, including longitudinal grooves 20, lateral grooves 22, and sipes 24 arranged in fluid communication with an outer, ground-engaging side 14 of tread 12 as each extend into the tread thickness T 12 from the outer, ground-engaging side 14.
  • the tread also includes a plurality of tread elements forming tread blocks 18 at least partially defined by longitudinal grooves 20 and lateral grooves 22.
  • Tire tread 12 has a thickness Tn bounded by the outer, ground-engaging side 14 and a bottom side 16.
  • Tread thickness Tu may remain constant or vary across the tread.
  • Tread thickness Tu extends in a direction perpendicular to the outer, ground-engaging side 14 or to the bottom side 16.
  • the radial direction of the tire is identified as R.
  • the tread width is identified as Wi2, while the tread length is identified as L12.
  • sipe 24 extends into the tread thickness T12 along a depthwise path represented by curvilinear line DP, the sipe from the outer, ground-engaging side 14 and to a terminal end 26 within the tread thickness T12.
  • Sipe 24 also has a length L24 (see FIG. 1) and a thickness T24, each extending perpendicular to the depthwise path DP and to one another.
  • the sipe thickness T24 also extends in a direction perpendicular to the sipe length L24 (see FIG. 1), the sipe length being greater than the sipe thickness.
  • depthwise path DP is located midway across the sipe thickness T24.
  • the depthwise path DP (and of the sipe 24) undulates back and forth in a direction perpendicular to the direction of the tread thickness as the depthwise path DP extends into the tread thickness, thereby forming a plurality of undulations U24. Accordingly, because the back and forth movement occurs as the sipe extends into the tread thickness, the depthwise path DP undulates partially in the direction perpendicular to the direction of the tread thickness and partially in the direction of the tread thickness, when separating the path DP into vector components.
  • the undulations are arranged along a substantial portion of the height H24 of sipe 24 (and of the height of depthwise path DP). It is also noted that undulations U24 decrease in amplitude as the sipe and depthwise path each extend deeper into the tread thickness.
  • the widthwise extent of the sipe taking into account the presence of each oscillation, is identified as W24, where the widthwise extend of sipe 24 decreases as the sipe extends deeper into the tread thickness.
  • the transverse extent of width W24 is defined on each side of the sipe by a straight line TAN extending from the peak (or maximum section or widthwise extent) of each undulation (in this case, at a point of tangency with the peak of each undulation).
  • a centerline CL of sipe 24 is arranged midway across width W24, as centerline CL extends in the direction of the tread thickness.
  • Centerline CL is also the centerline of the depth wise path DP.
  • the amplitude of each undulation is measured from centerline CL, the amplitude extending from centerline CL and to the widthwise extent of each undulation U24 from the centerline CL (that is, at each undulation peak), the amplitude being half of width W24 at each corresponding depthwise location along centerline CL.
  • the sipe is characterized as having a plurality of undulations U24, where the undulations U24 are characterized as having a reduced amplitude as undulations are located deeper within the tread thickness T12.
  • undulating sipe 24 has a tapering width W24, the width W24 narrowing as the sipe 24 extends deeper into the tread thickness T12.
  • This tapering is represented by lines TAN, where the tapering of TAN is measured relative to centerline CL.
  • sipe 24 is shown in accordance to another variation.
  • sipe 24 is in fluid communication with the outer, ground-engaging side 14 and extends into the tread thickness T12 away from the outer, ground-engaging side 14 and to terminal end 26.
  • Sipe 24 can be described as including chamfers or transition portions 28 at the location where the sipe intersects the outer, ground-engaging side 14 to provide a widened portion of the sipe.
  • sipe 24 can be described as indirectly extending from the outer, ground-engaging side 14 by extending from a void feature (also represented by 28), such as a shallow groove, arranged along the outer, ground-engaging side 14.
  • the undulating depthwise path DP of sipe 24 in FIG. 2 is shown in greater detail.
  • the depthwise path DP has a plurality of undulations UDP each associated with an undulation U24 of sipe 24.
  • One manner for determining the amount of taper for any transverse side of the sipe 24 is dividing the amplitude A m i n of the smallest oscillation, which is associated with the undulation located closest to terminal end 26, by the amplitude of the largest oscillation, which is associated with the undulation located closest to the outer, ground-engaging side. In the variation shown in FIG.
  • the taper is linear as each tangent line TAN extends linearly and is tangent to each undulation U DP arranged along a respective transverse side of the depthwise path DP.
  • the taper for any side of the sipe 24 or depthwise path DP may also be determined by dividing the difference between the maximum amplitude A MAX (the amplitude associated with the largest undulation) and the smallest amplitude A m i n (the amplitude associated with the smallest undulation) by the largest amplitude A MAX , which is expressed in the following equation:
  • the taper may be non-linear and correspond to any non-linear function.
  • the non-linear taper is a function of the tread depth (that is, in the direction of the tread thickness, also known as the z- direction).
  • any linear or non-linear taper generally decreases as the sipe/depthwise path extends toward the terminal end.
  • “Generally decreases” contemplates that while portions of a non- linear taper provide a decreasing amplitude, other portions of the non-linear taper may not decrease, but also do not decrease and instead are characterized as having a zero slope.
  • any linear or non-linear taper provides a sipe that decreases in width as it extends toward the terminal end. That being said, it is understood that the taper along each side of the sipe (that is, the sides between which the sipe undulates) may be different, such that the tapers and the sipe width are symmetric or asymmetric relative to the centerline.
  • each sipe 24 is characterized as having symmetric tapers relative centerline CL. Also identified in FIG. 4 is the pitch P associating the plurality of undulations U DP along depthwise path DP. It is observed that in this variation, the undulations U DP along depthwise path DP, as well as the undulations U24 along sipe 24, are arranged according to a constant pitch P. It is also observed that each undulation U DP spans a half pitch 1 ⁇ 2 P. As suggested previously, it is appreciated that in other variations that the pitch may be variable.
  • the X-direction with reference to the sipes shown in FIGS. 2 and 3 is the direction of the sipe width (that is, the direction in which the undulations undulate, which is a direction perpendicular to both the sipe length and sipe height or, with reference to the tire tread, the direction of the tread length).
  • the Z- direction is the direction of the tread thickness.
  • results of the finite element analysis comparison is shown, where sipes undulating with increasing depth with tapers of 50%, 62.5%, 75%, and 90% show improvements in both X and Z rigidity of up to 5% in Z rigidity and up to 8% in X rigidity as compared to reference sipes undulating with increasing depth without any taper (that is, 0% taper). It is also observed that with increasing taper, a further increase in Z rigidity is observed. Increases in Z rigidity further improve rolling resistance performance, which increases in X rigidity further improve wear and rolling resistance performance.
  • the undulations may form any shape.
  • the undulations in FIGS. 2-4 the undulations U24, U DP are contoured, and when viewed together, the plurality of undulations form a sinusoidal wave of decreasing amplitude.
  • a sipe 24 is shown having V-shaped undulations U24.
  • taper-defining lines TAN are shown extending peak-to- peak between adjacent undulations U24 along each side of sipe 24, each peak being located at the vertex of the V-shape.
  • a sipe 24 is shown having step-shaped undulations U24.
  • taper-defining lines TAN are shown extending peak-to-peak between adjacent undulations U24 along each side of sipe 24, each peak forming a linear extension of each step at its widthwise extent, where each line TAN extends through a midpoint of each linear extension of each step-shaped undulation U24.
  • tapered undulations may be employed by any known sipe or sipe configuration, with reference to an exemplary embodiment in FIG. 8, a sipe 24 characterized as having tapering undulations U24 is inclined.
  • sipe 24 is inclined relative to the outer, ground-engaging side 14 by angle a.
  • inclination angle a may be any known angle, whether positive or negative.
  • sipe 24 may be inclined in any direction, that is, inclined in a direction of the tread length, tread width, or anywhere in between as may be known.
  • a sipe molding element is employed, the sipe molding element forming positive shape of the sipe being formed, the sipe being a negative of the sipe.
  • an exemplary sipe molding element 30 is shown in FIG. 9 for forming a molded sipe.
  • the sipe molding element 30 includes a molding portion 32, configured to form the sipe, and optionally may include a mold mounting portion 34 for mounting the sipe molding element 30 into a mold (not shown).
  • Sipe molding portion 32 has a height H 3 2 configured to extend into an uncured tread to form a negative in the tread, the negative resulting in a molded sipe, the height H 3 2 extending along path DP E from the mold mounting portion 34 and to a terminal end 36.
  • path DP E and thickness T 3 2 of molding portion 32 undulates back and forth in a direction perpendicular to the direction of the tread thickness as the depthwise path DP E extends into the tread thickness, thereby forming a plurality of undulations 11 ⁇ 2.
  • Molding portion 32 also has a length L 32 and a thickness T 32 , each extending perpendicular to the depthwise path DP E and to one another.
  • the molding portion thickness T 3 2 also extends in a direction perpendicular to the molding portion length L 3 2, the molding portion length being greater than the molding portion thickness.
  • a sipe molding element 30 is shown having a sipe molding portion 32 for forming a sipe having a like- shaped void.
  • Sipe molding portion 32 includes an area of reduced thickness 38, which is completely bounded by thicker portions of the sipe molding portion 32.
  • This sipe molding portion 32 forms a like-shaped sipe having an area of reduced thickness shown in FIG. 10, which is completely bounded by thicker portions of the sipe.
  • the area of reduced thickness 38 is at least partially bounded by thicker portions of sipe molding portion 32 to form like-shaped sipes.
  • multiple areas of reduced thickness 38 may be arranged along sipe molding portion 32 for forming a sipe having multiple areas of reduced thickness. While any desired thicknesses may be employed for the thicker portions and areas of reduced thickness in each of the sipe molding portion and a corresponding molded sipe, in certain exemplary instances, the thicker portions are 0.4 mm to 1.2 mm thick and areas of reduced thickness are less than 4 mm thick or 0.1 mm to less than 0.4 mm. Each of these thickness may remain constant or may be variable.
  • any sipe may include additional undulations, where the sipe undulates as it extends in any other direction of the sipe.
  • the sipe may also undulate back and forth as the sipe extends in a direction of the sipe length.

Landscapes

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

Abstract

Des modes de réalisation particuliers de l'invention concernent une bande de roulement de pneu (18), la bande de roulement de pneu comprenant au moins une lamelle (24) s'étendant dans l'épaisseur de bande de roulement le long d'un trajet de profondeur dans l'épaisseur de bande de roulement à l'opposé d'un côté de mise en prise avec le sol externe de la bande de roulement et vers une extrémité terminale. La lamelle présente une épaisseur s'étendant perpendiculairement au trajet de profondeur, le trajet de profondeur étant située à mi-chemin à travers l'épaisseur de lamelle, une partie du trajet de profondeur ondulant selon un mouvement de va-et-vient dans une direction perpendiculaire à la direction de l'épaisseur de bande de roulement à mesure que le trajet de profondeur s'étend dans l'épaisseur de bande de roulement pour former une pluralité d'ondulations (U24), les ondulations diminuant en amplitude par rapport à une ligne centrale du trajet de profondeur à mesure que la lamelle s'étend plus loin dans l'épaisseur de bande de roulement en direction de l'extrémité terminale (26).
PCT/US2017/047632 2017-08-18 2017-08-18 Bandes de roulement de pneu comprenant des lamelles coniques et ondulées WO2019035847A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2017/047632 WO2019035847A1 (fr) 2017-08-18 2017-08-18 Bandes de roulement de pneu comprenant des lamelles coniques et ondulées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2017/047632 WO2019035847A1 (fr) 2017-08-18 2017-08-18 Bandes de roulement de pneu comprenant des lamelles coniques et ondulées

Publications (1)

Publication Number Publication Date
WO2019035847A1 true WO2019035847A1 (fr) 2019-02-21

Family

ID=59714187

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2017/047632 WO2019035847A1 (fr) 2017-08-18 2017-08-18 Bandes de roulement de pneu comprenant des lamelles coniques et ondulées

Country Status (1)

Country Link
WO (1) WO2019035847A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900022473A1 (it) * 2019-11-29 2021-05-29 Bridgestone Europe Nv Sa Pneumatico, in particolare del tipo invernale
EP3984769A4 (fr) * 2019-06-14 2023-07-05 Bridgestone Corporation Bandage pneumatique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794965A (en) * 1987-03-10 1989-01-03 Compagnie Generale Des Etablissements Michelin Tread for radial tire the elements in relief of which are provided with incisions having broken line or undulated line traces in the direction of their depth
JP2002192916A (ja) * 2000-12-22 2002-07-10 Yokohama Rubber Co Ltd:The 空気入りタイヤ及び空気入りタイヤ製造用金型
EP2133217A1 (fr) * 2008-06-14 2009-12-16 Continental Aktiengesellschaft Pneus de véhicule
KR20100055111A (ko) * 2008-11-17 2010-05-26 한국타이어 주식회사 자동차용 타이어 가황 금형의 커프 성형용 블레이드
US20120000585A1 (en) * 2008-12-05 2012-01-05 Societe De Technologie Mchelin Tread with Blocks
WO2016003435A1 (fr) * 2014-06-30 2016-01-07 Compagnie Generale Des Etablissements Michelin Lamelle de largeur variable pour une bande de roulement de pneu, et pneu
WO2017058226A1 (fr) * 2015-09-30 2017-04-06 Compagnie Generale Des Etablissements Michelin Lamelles d'épaisseur variable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794965A (en) * 1987-03-10 1989-01-03 Compagnie Generale Des Etablissements Michelin Tread for radial tire the elements in relief of which are provided with incisions having broken line or undulated line traces in the direction of their depth
JP2002192916A (ja) * 2000-12-22 2002-07-10 Yokohama Rubber Co Ltd:The 空気入りタイヤ及び空気入りタイヤ製造用金型
EP2133217A1 (fr) * 2008-06-14 2009-12-16 Continental Aktiengesellschaft Pneus de véhicule
KR20100055111A (ko) * 2008-11-17 2010-05-26 한국타이어 주식회사 자동차용 타이어 가황 금형의 커프 성형용 블레이드
US20120000585A1 (en) * 2008-12-05 2012-01-05 Societe De Technologie Mchelin Tread with Blocks
WO2016003435A1 (fr) * 2014-06-30 2016-01-07 Compagnie Generale Des Etablissements Michelin Lamelle de largeur variable pour une bande de roulement de pneu, et pneu
WO2017058226A1 (fr) * 2015-09-30 2017-04-06 Compagnie Generale Des Etablissements Michelin Lamelles d'épaisseur variable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3984769A4 (fr) * 2019-06-14 2023-07-05 Bridgestone Corporation Bandage pneumatique
US11926176B2 (en) 2019-06-14 2024-03-12 Bridgestone Corporation Pneumatic tire
IT201900022473A1 (it) * 2019-11-29 2021-05-29 Bridgestone Europe Nv Sa Pneumatico, in particolare del tipo invernale

Similar Documents

Publication Publication Date Title
US10773556B2 (en) Tire tread comprising variable thickness sipes with multiple areas of reduced thickness
CN109070651B (zh) 卡车轮胎胎面和卡车轮胎
EP2342069B1 (fr) Bande de roulement de pneumatique avec incision ondulée
US9139048B2 (en) Tread having a tread pattern with incisions
US8708011B2 (en) Pneumatic tire with tread having sipes
US10688831B2 (en) Tire tread with sipe
US20170166015A1 (en) Variable-width sipe for tire tread and tire
US20180281328A1 (en) Variable thickness sipes
CN110248823B (zh) 具有正向倾斜胎纹沟的改进的轮胎胎面
WO2017075373A1 (fr) Dessin de bande de roulement de pneu doté de lamelles fines, de gouttes et de faible rapport de vide latéral
US20180272637A1 (en) Hybrid sipes and methods for forming a tire tread
US20200369091A1 (en) Tire tread having tread blocks with inclined trailing side and sipe
WO2015091333A1 (fr) Bande de roulement comportant des blocs incurvés pourvus de lamelles
JP2018531842A (ja) ねじれたサイプ
CN109562652B (zh) 重型卡车轮胎胎面和重型卡车轮胎
WO2019035847A1 (fr) Bandes de roulement de pneu comprenant des lamelles coniques et ondulées
WO2020102056A1 (fr) Pneu de camion ayant une densité de lamelle variable dans des nervures inclinées
JP2019064481A (ja) タイヤ
CN108146153B (zh) 充气轮胎
US20200114697A1 (en) Tire tread having submerged void feature with tapered orifice
RU2679034C1 (ru) Пневматические шины транспортного средства
US20200276779A1 (en) Tire of Which the Tread Comprises Wavy Grooves

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17758409

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17758409

Country of ref document: EP

Kind code of ref document: A1