WO2020130115A1 - Bande de roulement à incision pour performances équilibrées - Google Patents

Bande de roulement à incision pour performances équilibrées Download PDF

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Publication number
WO2020130115A1
WO2020130115A1 PCT/JP2019/049980 JP2019049980W WO2020130115A1 WO 2020130115 A1 WO2020130115 A1 WO 2020130115A1 JP 2019049980 W JP2019049980 W JP 2019049980W WO 2020130115 A1 WO2020130115 A1 WO 2020130115A1
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WO
WIPO (PCT)
Prior art keywords
incision
tread
orientation
inclined portion
width
Prior art date
Application number
PCT/JP2019/049980
Other languages
English (en)
Inventor
Kiyoteru Ando
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
Publication of WO2020130115A1 publication Critical patent/WO2020130115A1/fr

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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
    • B60C11/1204—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
    • 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
    • B60C2011/1227—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe having different shape within the pattern

Definitions

  • the present invention relates to a tread for a tire, in particular to a tread for a tire possible to maintain high level performance on normal road until close to end of wear life.
  • FR2641501 discloses a tread provided with incisions which in cross-section have a fork-shaped outline with at least two branches for improving adherence during the life of the tire.
  • WO2014102039 discloses a tread having a raised element comprising a recess in its side wall for better compromise between grip on a snowy road surface and grip on an icy road surface.
  • a “tire” means all types of elastic tire whether or not subjected to an internal pressure.
  • a “tread” of a tire means a quantity of rubber material bounded by lateral surfaces and by two main surfaces one of which is intended to come into contact with ground when the tire is rolling.
  • a “groove” is a space between two rubber faces/sidewalls which do not contact between themselves under usual rolling condition connected by another rubber face/ bottom.
  • a groove has a width and a depth.
  • An “incision”, also referred to as a “sipe”, is a narrow cutout formed toward radially inwardly from a surface of a tread made by, for example a thin blade having a shape like a knife blade.
  • a width of the incision at the surface of the tread is narrower than a groove, for example less than or equal to 2.0mm. This incision may, different from the groove, be partly or completely closed when such the incision is in a contact patch and under usual rolling condition.
  • This arrangement provides higher performance at close to end of wear life while maintaining a rigidity of a contact element.
  • the contact element is provided with at least one incision comprising a zigzag portion consisting of at least two first inclined portions extending downwardly in an orientation with non-zero angle relative to radial orientation and at least one second inclined portion extending downwardly in an orientation with non-zero angle relative to radial orientation and opposite to the first inclined portion, the first inclined portion and the second inclined portion being connected via a connecting portion at closest extremities, opposing side of the zigzag portion contact each other at least partly at loading or applied acceleration/braking force which prevent degradation of rigidity of the contact element.
  • the at least one incision has at least one projection portion projecting from the connecting portion toward the same orientation as the first inclined portion or the second inclined portion positioned radially outward of the connecting portion, the at least one projection portion acts as an extra storage volume for evacuating water between ground and the contact face appears after certain level of tread wear, thus performance at close to end of wear life especially wet performance can be improved.
  • the incision comprises two straight portions at radially outermost and radially innermost of the incision.
  • the projection portion comprises an acute portion at an end opposite to the connecting portion.
  • the depth d of the incision is the same as the depth D of the groove.
  • the incision has at least two connecting portions, and a projected distance between axially two adjacent connecting portions projected to the contact face is at most equal to 5 times of the width t of the incision.
  • a projected length of the projection portion projected to the contact face is at most equal to 5 times of the width t of the incision.
  • a width of the projection portion is at most equal to twice the width t of the incision.
  • this width of the projection portion is more than twice the width t of the incision, there is a risk that a void created by the projection portion becomes too large which leads decrease of rigidity of the contact element provided with the incision having the projection portion.
  • Fig. 1 is a schematic plan view of a tread according to a first embodiment of the present invention
  • Fig. 2 is a cross sectional view taken along line II-II in Fig. 1
  • Fig. 3 is a schematic cross sectional view according to a second embodiment of the present invention
  • Fig. 4 is a schematic cross sectional view according to a third embodiment of the present invention
  • the zigzag portion 41 of the incision 4 is consisting of two first inclined portions 42 and two second inclined portions 43, and three connecting portions 44 are connecting the first inclined portion 42 and the second inclined portion 43, the first inclined portion 42 is extending from top-right to bottom-left orientation, and the second inclined portion 43 is extending from top-left to bottom-right orientation.
  • the incision 4 comprises at least one straight portion 46, more precisely the incision 4 comprises two straight portions 46 at radially outermost and radially innermost of the incision 4.
  • the incision 4 has one projection portion 45 projecting from the connecting portion 44 toward the same orientation as the first inclined portion 42 or the second inclined portion 43 positioned radially outward of the connecting portion 44 where the projection portion 45 is affixed to.
  • the projection portion 45 comprises an acute portion 47 at an end opposite to the connecting portion 44.
  • the acute portion 47 is facing to radially inward orientation.
  • the incision 4 has at least two connecting portions 44, and a projected distance between axially two adjacent connecting portions 44 projected to the contact face 2 is at most equal to 5 times of the width t of the incision 4.
  • a projected length of the projection portion 45 projected to the contact face 2 is at most equal to 5 times of the width t of the incision 4.
  • a width of the projection portion 45 is at most equal to twice the width t of the incision 4.
  • the projection portion 45 is extending as to extend continuously the second inclined portion 43 keeping the same width as the second inclined portion 43.
  • the at least one incision 4 has at least one projection portion 45 projecting from the connecting portion 44 toward the same orientation as the first inclined portion 42 or the second inclined portion 43 positioned radially outward of the connecting portion 44, the at least one projection portion 45 acts as an extra storage volume for evacuating water between ground and the contact face 2 appears after certain level of tread wear, thus performance at close to end of wear life especially wet performance can be improved.
  • the projection portion 45 comprises an acute portion 47 at an end opposite to the connecting portion 44, it is possible to increase manufacturing efficiency of the tread 1 provided with the incision 4 as the acute portion 47 comprised in the projection portion 45 facilitates push the incision 4 provided with the projection portion 45 into a green tire during molding.
  • the incision 4 has at least two connecting portions 44, and a projected distance between axially two adjacent connecting portions 44 projected to the contact face 2 is at most equal to 5 times of the width t of the incision 4, it is possible to increase manufacturing efficiency of the tread 1 having the incision 4 provided with the zigzag portion 41.
  • a projected length of the projection portion 45 projected to the contact face 2 is at most equal to 5 times of the width t of the incision 4, it is possible to increase manufacturing efficiency of the tread 1 having the incision 4 provided with the projection portion 45.
  • this projected length of the projection portion 45 is more than 5 times of the width t of the incision 4, there is a risk that the incision 4 cannot be demolded due to too wide projection portion 45 leading decrease of manufacturing efficiency of the tread 1 having the incision 4 provided with the projection portion 45.
  • a width of the projection portion 45 is at most equal to twice the width t of the incision 4, it is possible to improve performance at close to end of wear life especially wet performance without degrading rigidity of the contact element 5.
  • this width of the projection portion 45 is more than twice the width t of the incision 4, there is a risk that a void created by the projection portion 45 becomes too large which leads decrease of rigidity of the contact element 5 provided with the incision 4 having the projection portion 45.
  • Each the first inclined portion 42 and the second inclined portion 43 may extend not only in straight manner but also in curved manner. Each the first inclined portion 42 and the second inclined portion 43 may extend at different angle relative to radial orientation each other.
  • a form of the incision 4 on the contact face 2 may be straight, curved, waved or zigzagged.
  • the incision 4 may or may not open to the circumferential groove 3b, only at one axial end or both two axial ends.
  • the projection portion 45 may be provided at any connecting portion 44 in the incision 4, number of the projection portion 45 in one incision 4 being less than or equal to number of the connecting portion 44 in the incision 4. In case multiple number of incisions are provided in one contact element 5, the contact element 5 may include an incision without projection portion 45, and/or without zigzag portion 41.
  • Fig. 3 is a schematic cross sectional view according to a second embodiment of the present invention.
  • the construction of this second embodiment is similar to that of the first embodiment other than the arrangement shown in Fig. 3, thus description will be made referring to Fig. 3.
  • the zigzag portion 241 of the incision 24 is consisting of three first inclined portions 242 and two second inclined portions 243, and four connecting portions 244 are connecting the first inclined portion 242 and the second inclined portion 243, the first inclined portion 242 is extending from top-right to bottom-left orientation, and the second inclined portion 243 is extending from top-left to bottom-right orientation.
  • the incision 24 comprises one straight portion 246 at radially innermost of the incision 24. Contrary the zigzag portion 241 of the incision 24 is opening to the contact face 22 without having the straight portion.
  • the incision 24 has two projection portions 245 projecting from the connecting portion 244 toward the same orientation but radially downwardly as the first inclined portion 242 or the second inclined portion 243 positioned radially outward of the connecting portion 244 where the projection portion 245 is affixed to.
  • the projection portion 245 comprises an acute portion 247 at an end opposite to the connecting portion 244.
  • the acute portion 247 is facing to radially inward orientation.
  • the depth d of the incision 24 is the same as the depth D of the groove 23.
  • the projection portions 245 projecting from different connecting portions 244 may have different dimensional characteristics such as a width, a length or a shape one another.
  • the at least one incision 34 comprising a zigzag portion 341 consisting of at least two first inclined portions 342 extending downwardly in an orientation with non-zero angle relative to radial orientation and at least one second inclined portion 343 extending downwardly in an orientation with non-zero angle relative to radial orientation and opposite to the first inclined portion 342, the first inclined portion 342 and the second inclined portion 343 being connected via a connecting portion 344 at closest extremities of the first inclined portion 342 and the second inclined portion 343.
  • the zigzag portion 341 of the incision 34 is consisting of two first inclined portions 342 and two second inclined portions 343, and three connecting portions 344 are connecting the first inclined portion 342 and the second inclined portion 343, the first inclined portion 342 is extending from top-right to bottom-left orientation, and the second inclined portion 343 is extending from top-left to bottom-right orientation.
  • the incision 34 comprises two straight portions 346 at radially innermost and at radially outermost of the incision 34.
  • the incision 34 has one projection portion 345 projecting from the connecting portion 344 toward the same orientation as the first inclined portion 342 or the second inclined portion 343 positioned radially outward of the connecting portion 344 where the projection portion 345 is affixed to.
  • the projection portion 345 is projecting from radially lower part of the connecting portion 344.
  • a width of the projection portion 345 is a little narrower than a width t of the incision 34.
  • the projection portion 345 comprises an acute portion 347 at an end opposite to the connecting portion 344.
  • the acute portion 347 is facing to radially inward orientation.
  • the width of the projection portion 345 is narrower than the width t of the incision 34, it is possible to prevent more efficiently degradation of rigidity of the contact element 35 while still securing an extra storage volume for evacuating water between ground and the contact face 32 appears after certain level of tread wear, thus performance at close to end of wear life especially wet performance can be improved.
  • the Example was a block model as described in the above first embodiment.
  • the Reference was a block model as described in the above first embodiment but an incision was provided without a projection portion. Both the Example and Reference were designed as to be made of the same rubber material, and had the same block width of 20 mm, groove depth D of 8.5 mm, incision depth d of 7.0 mm and incision width t of 0.6 mm.
  • the Example shows equivalent block stiffness against Reference even with additional void thanks to the projection portion, which leads higher performance at close to end of wear life while maintaining a rigidity of a contact element.

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

Abstract

La présente invention concerne une bande de roulement pour un pneu ayant une face de contact, la bande de roulement étant pourvue d'une pluralité de rainures, la pluralité de rainures délimitant une pluralité d'éléments de contact comportant au moins une incision, la ou les incisions comprenant une partie en zigzag constituée d'au moins deux premières parties inclinées s'étendant vers le bas dans une orientation avec un angle non nul par rapport à l'orientation radiale et d'au moins une seconde partie inclinée s'étendant vers le bas dans une orientation avec un angle non nul par rapport à l'orientation radiale et opposée à la première partie inclinée, la première partie inclinée et la seconde partie inclinée étant reliées par l'intermédiaire d'une partie de liaison aux extrémités les plus proches, la ou les incisions ayant au moins une partie de projection faisant saillie à partir de la partie de liaison vers la même orientation que la première partie inclinée ou la seconde partie inclinée positionnée radialement vers l'extérieur de la partie de liaison.
PCT/JP2019/049980 2018-12-20 2019-12-20 Bande de roulement à incision pour performances équilibrées WO2020130115A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-237898 2018-12-20
JP2018237898 2018-12-20

Publications (1)

Publication Number Publication Date
WO2020130115A1 true WO2020130115A1 (fr) 2020-06-25

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2641501A1 (fr) 1989-01-10 1990-07-13 Michelin & Cie Bande de roulement pour pneumatique destine a des roulages hivernaux
JP2000211322A (ja) * 1999-01-25 2000-08-02 Toyo Tire & Rubber Co Ltd 空気入りラジアルタイヤ
US20100288408A1 (en) * 2007-10-01 2010-11-18 Toyo Tire & Rubber Co., Ltd. Pneumatic Tire
WO2010144091A1 (fr) * 2009-06-12 2010-12-16 Societe De Technologie Michelin Elément moule progressif pour pneumatique pourvu d'une ondulation sur son élément supérieur et pneumatique formé par celui-ci
WO2014040958A1 (fr) 2012-09-13 2014-03-20 Compagnie Generale Des Etablissements Michelin Bande de roulement et pneu pour poids lourd
WO2014102039A1 (fr) 2012-12-28 2014-07-03 Compagnie Generale Des Etablissements Michelin Bande de roulement comportant des elements de sculpture comprenant une couche de recouvrement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2641501A1 (fr) 1989-01-10 1990-07-13 Michelin & Cie Bande de roulement pour pneumatique destine a des roulages hivernaux
JP2000211322A (ja) * 1999-01-25 2000-08-02 Toyo Tire & Rubber Co Ltd 空気入りラジアルタイヤ
US20100288408A1 (en) * 2007-10-01 2010-11-18 Toyo Tire & Rubber Co., Ltd. Pneumatic Tire
WO2010144091A1 (fr) * 2009-06-12 2010-12-16 Societe De Technologie Michelin Elément moule progressif pour pneumatique pourvu d'une ondulation sur son élément supérieur et pneumatique formé par celui-ci
WO2014040958A1 (fr) 2012-09-13 2014-03-20 Compagnie Generale Des Etablissements Michelin Bande de roulement et pneu pour poids lourd
WO2014102039A1 (fr) 2012-12-28 2014-07-03 Compagnie Generale Des Etablissements Michelin Bande de roulement comportant des elements de sculpture comprenant une couche de recouvrement

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