WO2019004414A1 - Bande de roulement pour améliorer les performances sur la neige - Google Patents

Bande de roulement pour améliorer les performances sur la neige Download PDF

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Publication number
WO2019004414A1
WO2019004414A1 PCT/JP2018/024768 JP2018024768W WO2019004414A1 WO 2019004414 A1 WO2019004414 A1 WO 2019004414A1 JP 2018024768 W JP2018024768 W JP 2018024768W WO 2019004414 A1 WO2019004414 A1 WO 2019004414A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection portion
tread
length
snow
extremity
Prior art date
Application number
PCT/JP2018/024768
Other languages
English (en)
Inventor
Tomotake UCHIDA
Yuji Kanno
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 WO2019004414A1 publication Critical patent/WO2019004414A1/fr

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    • 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
    • B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
    • 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
    • B60C11/13—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
    • 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
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to 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
    • 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
    • B60C2011/1338—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising protrusions

Definitions

  • the present invention relates to a tread for a tire, in particular to a tread for a tire possible to improve performance on snow covered ground.
  • a winter tire sometimes called as studless tire, is recognized as an important tool for driving safely on a wintry road covered by snow and/or ice.
  • the winter tire When driving on a snow covered ground, the winter tire obtains driving/braking force while forming a snow pillar in a groove formed in a tread of the winter tire by compacting snow in the groove and shearing the snow pillar (snow shearing force). Therefore, in order to obtain high level of driving/braking force on the snow covered ground, it is important to form a strong snow pillar which is not easily removed.
  • JP2012-180063 discloses a tire provided with a block having a projection projecting from a block sidewall and having an inclined surface inclining towards side and bottom of the block.
  • JP2013-006549 discloses a tire provided with a block containing a sipe, a plurality of projections projecting from a sipe sidewall for preventing sipe clogging by snow.
  • JP2007-030718 discloses a tire provided with a block having a projection projecting from a block sidewall for evacuating water film during braking on wet ground.
  • a “radial direction/orientation” is a direction/orientation perpendicular to axis of rotation of the tire. This direction/orientation corresponds to thickness orientation of the tread.
  • An “axial direction/orientation” is a direction/orientation parallel to axis of rotation of the tire.
  • a “circumferential direction/orientation” is a direction/orientation which is tangential to any circle centered on axis of rotation. This direction/orientation is perpendicular to both the axial direction/orientation and the radial direction/orientation.
  • 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.
  • a “sipe”, also referred to as an “incision”, 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.
  • a range represented as “between a and b” means greater than a and less than b (does not include the upper and lower limiting numbers), and a range represented as “from a to b” represents more than or equal to a and less than or equal to b (includes the upper and lower limiting numbers).
  • the present invention provides a tread for a tire having a contact face intended to come into contact with ground during rolling, the tread being provided with at least one principal groove and a plurality of sub grooves of a depth D, the at least one principal groove and the plurality of sub grooves delimiting a plurality of contact elements; at least one contact element among the plurality of contact elements comprising a top face constituting a part of the contact face, and two frontal faces each facing to different sub groove among the plurality of sub grooves, at least one incision opening to the top face extending inwardly to radial orientation and substantially parallel to a direction the sub groove being extending, the sub groove and the incision adjacent to the sub groove forming a small block of a length Lb; at least one of the frontal face having a projection portion projecting with a length Lp from the frontal face toward the frontal face of another contact element across the sub groove until an extremity of the projection portion, a radially outermost intersection of the projection portion intersecting with the frontal face being offset radially
  • This arrangement provides improvement of snow performance.
  • the block is provided with the projection portion projecting with the length Lp from the frontal face toward the frontal face of another contact element across the sub groove until the extremity of the projection portion that is from 25 to 200% of the length Lb of the small block. Therefore, the projection portion is able to prevent removal of snow pillar formed in the sub groove enabling to form a strong snow pillar, and keeping such strong snow pillar for a long time during contact with the snow covered ground. As a result, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • the length Lp of the projection portion is less than 25% of the length Lb of the small block, there is a risk that the projection portion cannot prevent removal of snow pillar formed in the sub groove and under the projection portion which results no improvement of performance on the snow covered ground. If the length Lp of the projection portion is more than 200% of the length Lb of the small block, there is a risk that the projection portion interferes with opposed frontal face for example which also interferes natural bending behavior of the small block during rolling, results possible performance degradation of performance on the snow covered ground. By setting this length Lp of the projection portion from 25 to 200% of the length Lb of the small block, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • the small block Since the radially outermost intersection of the projection portion intersecting with the frontal face being offset radially from the top face with the distance g, the small block is able to dig into the snow covered ground for compacting snow in the sub groove and under the projection portion. As a result, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • the length Lp of the projection portion is at least equal to 4.0 mm.
  • the length Lp of the projection portion is less than 4.0 mm, there is a risk that the projection portion cannot prevent removal of snow pillar formed in the sub groove and under the projection portion which results no improvement of performance on the snow covered ground.
  • this length Lp of the projection portion is set at least equal to 4.0 mm, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • This length Lp of the projection portion is preferably at least equal to 4.5 mm and less than a distance between two opposed frontal faces across the sub groove, more preferably at least equal to 5.0 mm and less than 75% of the distance between two opposed frontal faces across the sub groove.
  • the distance g is at most equal to 2.0 mm.
  • the distance g is more than 2.0 mm, there is a risk that the projection portion cannot prevent removal of snow pillar formed in the sub groove and under the projection portion which results no improvement of performance on the snow covered ground.
  • this distance g is more than 2.0 mm, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • This distance g is preferably from 0.1 to 2.0 mm, more preferably from 0.1 to 1.8 mm, and still more preferably from 0.3 to 1.8 mm and particularly from 0.3 to 1.5 mm.
  • the length Lb of the small block is from 5 to 15 mm.
  • the length Lb of the small block is less than 5 mm, there is a risk that the small block bends too much thus difficult to form snow pillar in the sub groove which results degradation of the performance on the snow covered ground. If the length Lb of the small block is more than 15 mm, there is a risk that the small block cannot bend enough for digging into snow which results degradation of the performance on the snow covered ground. By setting this the length Lb of the small block from 5 to 15 mm, the small block is able to bend appropriately for digging into snow and for effectively forming the snow pillar in the sub groove and under the projection portion thus performance on the snow covered ground can be improved.
  • a cross sectional shape of the extremity of the projection portion is an acute-angled shape.
  • a cross sectional shape of the extremity of the projection portion is a rounded shape.
  • a distance from the radially outermost intersection to the extremity of the projection portion along the projection portion is shorter than a distance from a radially innermost intersection of the projection portion intersecting with the frontal face to the extremity of the projection portion along the projection portion.
  • a distance from the radially outermost intersection to the extremity of the projection portion along the projection portion is longer than a distance from a radially innermost intersection of the projection portion intersecting with the frontal face to the extremity of the projection portion along the projection portion.
  • Fig. 1 is a schematic plan view of a portion of a tread for a tire according to a first embodiment of the present invention
  • Fig. 2 is a schematic 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
  • a tread 1 for a tire according to a first embodiment of the present invention will be described referring to Figs. 1 and 2.
  • Fig. 1 is a schematic plan view of a portion of a tread for a tire according to a first embodiment of the present invention.
  • Fig.2 is a schematic cross sectional view taken along line II-II in Fig. 1.
  • the tread 1 is a tread for a tire having dimension 225/45R17 and comprises a contact face 2 intended to come into contact with the ground during rolling, and three principal grooves 3 extending generally in circumferential orientation that is top-bottom orientation in Fig. 1, and a plurality of sub grooves 4 of a depth D (shown in Fig. 2) extending as to cross with the principal grooves 3, the principal grooves 3 and the sub grooves 4 delimitating a plurality of contact elements 6.
  • the depth D of the sub grooves 4 is 9.4 mm.
  • each the contact element 6 comprising two frontal faces 67, 68 each facing to different sub grooves 4, a top face 69 constituting a part of the contact face 2, and two incisions 5 opening to the top face 69 extending inwardly to radial orientation and substantially parallel to a direction the sub groove 4 being extending.
  • a depth of the incision 5 is smaller than the depth D of the sub groove 4 (shown in Fig. 2).
  • the sub groove 4 and the incision 5 adjacent to the sub groove 4 forming a small block 66 of a length Lb (shown in Fig. 2).
  • a projection portion 7 is projecting with a length Lp (shown in Fig. 2) toward the frontal face 67, 68 of another contact element across the sub groove 4 until an extremity 77 of the projection portion 7.
  • Lp shown in Fig. 2
  • the projection portion 7 is aligned as to project to the same circumferential direction, and as to project to different circumferential direction between two adjacent block rows.
  • the projection portion 7 is projecting from one of the frontal face 67 of the contact element 6 toward the frontal face 68 of another contact element across the sub groove 4 until the extremity 77 of the projection portion 7.
  • the projection portion 7 is intersecting with the frontal face 67 of the contact element 6 at a radially outermost intersection 78 of the projection portion 7 and at a radially innermost intersection 79 of the projection portion 7.
  • the radially outermost intersection 78 of the projection portion 7 intersecting with the frontal face 67 is offset radially inwardly from the top face 69 with a distance g. In the present embodiment the distance g is 0.3 mm.
  • the projection portion 7 has a triangular shape with an acute-angled cross sectional shape of the extremity 77 of the projection portion 7.
  • a distance from the radially outermost intersection 78 to the extremity 77 of the projection portion 7 along the projection portion 7 is shorter than a distance from the radially innermost intersection 79 of the projection portion 7 to the extremity 77 of the projection portion 7 along the projection portion 7.
  • the length Lp of the projection portion 7 is from 25 to 200% of the length Lb of the small block 66.
  • the length Lp of the projection portion 7 is 6.5 mm and the length Lb of the small block 66 is 5.2 mm, thus the length Lp of the projection portion 7 is 125% of the length Lb of the small block 66.
  • the block 6 is provided with the projection portion 7 projecting with the length Lp from the frontal face 67 toward the frontal face 68 of another contact element across the sub groove 4 until the extremity 77 of the projection portion 7 that is from 25 to 200% of the length Lb of the small block 66, the projection portion 7 is able to prevent removal of snow pillar formed in the sub groove 4 enabling to form a strong snow pillar, and keeping such strong snow pillar for a long time during contact with the snow covered ground. As a result, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • the length Lp of the projection portion 7 is less than 25% of the length Lb of the small block 66, there is a risk that the projection portion 7 cannot prevent removal of snow pillar formed in the sub groove 4 and under the projection portion 7 which results no improvement of performance on the snow covered ground. If the length Lp of the projection portion 7 is more than 200% of the length Lb of the small block 66, there is a risk that the projection portion 7 interferes with opposed frontal face 67, 68 for example which also interferes natural bending behavior of the small block 66 during rolling, results possible performance degradation of performance on the snow covered ground. By setting this length Lp of the projection portion 7 from 25 to 200% of the length Lb of the small block 66, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • the small block 66 Since the radially outermost intersection 78 of the projection portion 7 intersecting with the frontal face 67 being offset radially from the top face 69 with the distance g, the small block 66 is able to dig into the snow covered ground for compacting snow in the sub groove 4 and under the projection portion 7. As a result, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved.
  • the length Lp of the projection portion 7 is at least equal to 4.0 mm, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved. If the length Lp of the projection portion 7 is less than 4.0 mm, there is a risk that the projection portion 7 cannot prevent removal of snow pillar formed in the sub groove 4 and under the projection portion 7 which results no improvement of performance on the snow covered ground.
  • This length Lp of the projection portion 7 is preferably at least equal to 4.5 mm and less than a distance between two opposed frontal faces 67, 68 across the sub groove 4, more preferably at least equal to 5.0 mm and less than 75% of the distance between two opposed frontal faces 67, 68 across the sub groove 4.
  • the distance g is at most equal to 2.0 mm, it is possible to obtain high level of snow shearing force thus performance on the snow covered ground can be improved. If the distance g is more than 2.0 mm, there is a risk that the projection portion 7 cannot prevent removal of snow pillar formed in the sub groove 4 and under the projection portion 7 which results no improvement of performance on the snow covered ground.
  • This distance g is preferably from 0.1 to 2.0 mm, more preferably from 0.1 to 1.8 mm, and still more preferably from 0.3 to 1.8 mm and particularly from 0.3 to 1.5 mm.
  • the small block 66 Since the length Lb of the small block 66 is from 5 to 15 mm, the small block 66 is able to bend appropriately for digging into snow and for effectively forming the snow pillar in the sub groove 4 and under the projection portion 7 thus performance on the snow covered ground can be improved. If the length Lb of the small block 66 is less than 5 mm, there is a risk that the small block 66 bends too much thus difficult to form snow pillar in the sub groove 4 which results degradation of the performance on the snow covered ground. If the length Lb of the small block 66 is more than 15 mm, there is a risk that the small block 66 cannot bend enough for digging into snow which results degradation of the performance on the snow covered ground.
  • a cross sectional shape of the extremity 77 of the projection portion 7 is an acute-angled shape, it is possible to dig the extremity of the projection portion 7 into snow for getting extra friction coefficient for further improvement of performance on the snow covered ground.
  • the incision 5 may have a form other than straight, for example curved, waved, zigzagged or combination of these forms, not only on plan view (a view on the top face 69) but also on cross sectional view (in radial orientation). Also, the depth of the incision 5 may vary.
  • the incision 5 may open to the principal groove 3 on one side or on both sides, the incision 5 may not open to the principal groove 3.
  • the projection portion 7 may be manufactured integrally with the small block 66, or may be manufactured separately and attached to the frontal face 67, 68 of the block 6 (small block 66) by means to fix, for example by adhesives.
  • the projection portion 7 may be made of the same rubber-based material as the block 6, or may be made of a material different from the material constituting the block 6. Such the different material may be made of a rubber-based material, resin or plastics.
  • the length Lp of the projection portion 7 may be constant, or may vary in widthwise direction of the block 6. In case the length Lp of the projection portion 7 varies in widthwise direction of the block 6, it is preferable that the length Lp in a region closer to the principal groove 3 is longer than the length Lp around a center in widthwise direction of the block 6.
  • Multiple projection portions 7 may be provided per one frontal face 67, 68, in radial orientation or in widthwise orientation of the block 6, or to opposed frontal faces 67, 68 across the sub groove 4. In case multiple projection portions 7 are provided onto opposed frontal faces 67, 68 across the sub groove 4, it is preferable that the projection portions 7 are provided as not to contact each other during rolling. Cross sectional shape of each the multiple projection portion 7 may be the same, may be different one another.
  • the projection portion 7 may be provided as to extend upwardly from the frontal face 67, 68 toward the extremity 77 of the projection portion 7.
  • the projection portion 7 may be provided as to extend downwardly from the frontal face 67, 68 toward the extremity 77 of the projection portion 7.
  • the projection portion 7 may be provided on all the blocks 6 in the tread 1, may be provided on all the blocks 6 in particular block row, or may be provided only on particular block 6.
  • An extension direction of the projection portion 7 in the tread 1 may be the same, or may be different one another.
  • a shape of the projection portion 7 in the tread 1 may be the same, or may be different one another.
  • Fig. 3 is a schematic cross sectional view according to a second embodiment of the present invention.
  • the tread 21 is provided with at least one principal groove (not shown) and a plurality of sub grooves 24 of a depth D, the principal groove and the plurality of sub grooves 24 delimitating a plurality of contact element 26.
  • Each the plurality of contact element 26 comprising two frontal faces 267, 268 each facing to different sub grooves 24, a top face 269 constituting a part of the contact face 22.
  • At least one of contact element 26 is provided with one incision 25 having the same depth as the depth D of the sub groove 24.
  • the sub groove 24 and the incision 25 forming two small blocks 266 of a length Lb. In the present embodiment, the length Lb of the small block 266 is 8.6 mm.
  • a first projection portion 27a with a length Lpa toward the frontal face 268 of another contact element across the sub groove 24 until an extremity 277a of the first projection portion 27a.
  • the first projection portion 27a is intersecting with the frontal face 267 of the contact element 26 at a radially outermost intersection 278a of the first projection portion 27a and at a radially innermost intersection 279a of the first projection portion 27a.
  • the radially outermost intersection 278a of the first projection portion 27a intersecting with the frontal face 267 is offset radially inwardly from the top face 269 with a distance ga.
  • the second projection portion 27b is intersecting with the frontal face 268 of the contact element 26 at a radially outermost intersection 278b of the second projection portion 27b and at a radially innermost intersection 279b of the second projection portion 27b.
  • the radially outermost intersection 278b of the second projection portion 27b intersecting with the frontal face 268 is offset radially inwardly from the top face 269 with a distance gb.
  • the distance ga is longer than the distance gb. In the present embodiment, both the length Lpa and Lpb are 10.0 mm, the distance ga is 1.0 mm and the distance gb is 0.3 mm.
  • both the first projection portion 27a and the second projection portion 27b have a quarter circle-like shapes with a rounded cross sectional shape of the extremities 277a, 277b.
  • distances from the radially outermost intersections 278a, 278b to the extremity 277a, 277b of the first and the second projection portions 27a, 27b along the first and the second projection portions are longer than distances from a radially innermost intersections 279a, 279b of the first and the second projection portions 27a, 27b intersecting with the frontal faces 267, 268 to the extremities 277a, 277b of the first and the second projection portions along the first and the second projection portions.
  • the contact element 26 next to the contact element 26 provided with the first and the second projection portions 27a, 27b is not provided with the projection portions.
  • the cross sectional shape of the extremity 277a, 277b of the (first/second) projection portion 27a, 27b is a rounded shape, it is possible to prevent cracking of the extremity 277a, 277b of the (first/second) projection portion 27a, 27b.
  • the Example 1 was a block sample as described in the above first embodiment having the groove depth D equals to 9.4 mm, the length Lb of the small block equals to 5.2 mm, the length Lp of the projection portion equals to 6.5 mm and the distance g of the offset between the top face and the radially outermost intersection of the projection portion intersecting with the frontal face equals to 0.3 mm.
  • the Example 2 was a block sample having the same dimensional characteristics as the Example 1 except the cross sectional shape of the projection portion being as described in the above second embodiment and having the length Lp of the projection portion equals to 10.0 mm.
  • the Reference was a block sample having the same dimensional characteristics provided without the projection portion.
  • the Comparative Example was a block sample having the same dimensional characteristics as the Example 1 except the length Lp of the projection portion equals to 3.8 mm. All the Examples, Reference and Comparative Example were made of the same rubber-based material, typical rubber-based material used for passenger car winter tire.
  • the friction coefficient measurements on snow were carried out with the above Examples, Reference and Comparative Example sliding at a given condition (a displacement: 0 to 0.03 m, a speed: 0 to 0.5 m/s, and an acceleration: 5 m/s2) over a hard pack snow track, set at about -10°C with a CTI penetrometer reading of about 88 in accordance with Standard ASTM F1805, with an imposed normal stress (about 300 kPa).
  • the forces generated in a direction of travel (Fx) of each of the Examples, References and Comparative Examples and in another direction perpendicular to the travel (Fz) were measured.
  • the Fx/Fz ratio determines the friction coefficient of each of the Examples, Reference and Comparative Example on the snow.
  • results are shown in table 1.
  • results are represented by an index of 100 for Reference, higher the number indicates better the performance.

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

Abstract

La présente invention concerne une bande de roulement (1) pourvue d'au moins une rainure principale et d'une pluralité de sous-rainures (4) délimitant une pluralité d'éléments de contact (6); au moins un élément de contact (6) comprenant au moins une incision (5), la sous-rainure (4) et l'incision (5) adjacente à la sous-rainure formant un petit bloc (66) de longueur Lb; au moins une face frontale ayant une partie en saillie (7) faisant saillie sur une longueur Lp allant de la face frontale vers une extrémité de la partie en saillie, une intersection radialement le plus à l'extérieur (78) croisant la face frontale étant décalée par rapport à la face supérieure (69) selon une distance g; la longueur Lp de la partie en saillie représentant de 25 à 200 % de la longueur Lb du petit bloc.
PCT/JP2018/024768 2017-06-30 2018-06-29 Bande de roulement pour améliorer les performances sur la neige WO2019004414A1 (fr)

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JP2017024083 2017-06-30

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11139114A (ja) * 1997-11-14 1999-05-25 Yokohama Rubber Co Ltd:The 氷雪路用空気入りタイヤ
JP2000158915A (ja) * 1998-11-24 2000-06-13 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2005059634A (ja) * 2003-08-20 2005-03-10 Yokohama Rubber Co Ltd:The 氷雪路用空気入りタイヤ
JP2007030718A (ja) 2005-07-27 2007-02-08 Bridgestone Corp 空気入りタイヤ
JP2010030596A (ja) * 2009-11-11 2010-02-12 Toyo Tire & Rubber Co Ltd 空気入りタイヤ
JP2010254182A (ja) * 2009-04-27 2010-11-11 Bridgestone Corp タイヤ
JP2012180063A (ja) 2011-03-02 2012-09-20 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2013006549A (ja) 2011-06-27 2013-01-10 Yokohama Rubber Co Ltd:The スタッドレスタイヤ
WO2016113014A1 (fr) * 2015-01-13 2016-07-21 Continental Reifen Deutschland Gmbh Pneumatique de véhicule

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11139114A (ja) * 1997-11-14 1999-05-25 Yokohama Rubber Co Ltd:The 氷雪路用空気入りタイヤ
JP2000158915A (ja) * 1998-11-24 2000-06-13 Sumitomo Rubber Ind Ltd 空気入りタイヤ
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