WO2019087272A1 - Pneu avec dispositif de fermeture de rainure - Google Patents

Pneu avec dispositif de fermeture de rainure Download PDF

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Publication number
WO2019087272A1
WO2019087272A1 PCT/JP2017/039236 JP2017039236W WO2019087272A1 WO 2019087272 A1 WO2019087272 A1 WO 2019087272A1 JP 2017039236 W JP2017039236 W JP 2017039236W WO 2019087272 A1 WO2019087272 A1 WO 2019087272A1
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WO
WIPO (PCT)
Prior art keywords
groove
tread
principal
width
principal groove
Prior art date
Application number
PCT/JP2017/039236
Other languages
English (en)
Inventor
Takashi Tezuka
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/JP2017/039236 priority Critical patent/WO2019087272A1/fr
Publication of WO2019087272A1 publication Critical patent/WO2019087272A1/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
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
    • B60C11/047—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section the groove bottom comprising stone trapping protection elements, e.g. 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
    • B60C11/1315—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls having variable inclination angles, e.g. warped groove walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
    • 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
    • B60C2011/133—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising recesses
    • 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
    • B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
    • B60C2011/1361—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom with protrusions extending from the groove bottom

Definitions

  • the present invention relates to a tire, in particular to a tire with a groove closing device able to improve both noise and hydroplaning performance simultaneously until end of wear.
  • a groove resonance is generated by occurrence of resonance in an air column defined between a groove in a tread and a road surface in contact with the tire.
  • the frequency of this groove resonance is dependent on a length of the air column formed between groove and the road surface in the contact patch.
  • This groove resonance has a consequence in an interior noise and an exterior noise on a vehicle equipping such tires, a frequency of which interior and exterior noise is often at around 1 kHz where human ear is sensitive.
  • each flexible fence In order to reduce such groove resonance, it is known to provide a plurality of closing device in the form of a flexible fence made of rubber-based material and relatively thin in thickness in each groove. It is effective that each flexible fence covers all or at least major part of the sectional area in the groove. Each flexible fence can extend from a groove bottom, or be fixed onto at least one of a groove sidewall delimiting such groove. Because being relatively thin in thickness, each flexible fence has to bend for opening the groove section to flow water on the road surface, in particular on the wet road.
  • the length of the air column is reduced so as to be shorter than the total length of groove in a contact patch, which leads to change the frequency of groove resonance.
  • This change of resonance frequency makes the sound generated by the groove resonance less sensitive to human ear.
  • WO2010/063749 discloses a tire having a tread comprising at least two circumferential grooves and a plurality of transverse groove each opening to two circumferential grooves provided with a plurality of closing devices (flexible fences) extending radially outwardly from a groove bottom, the plurality of closing devices (flexible fences) being provided as to create a plurality of quarter-wave length resonators for attenuating a groove resonance of the circumferential groove while maintaining a drainage performance of the tread.
  • WO2011/089107 discloses a tread made of a rubber material with a shore A hardness of at least 65 comprising at least one circumferential groove provided with a plurality of closure membranes (flexible fence) extending radially outwardly from a groove bottom and being formed of a material with a shore A hardness of at most 62 and lower than the shore A hardness of the tread for better drainage performance with better productivity of the tread.
  • EP2377696 discloses a tread comprising a groove having an asymmetrical cross sectional shape, one groove wall being formed in a radially inward extending section with an angle in axial direction, and another groove wall being provided with two recesses distant in circumferential direction and being separated with a flat surface for improving snow performance while maintaining drainage performance.
  • WO2011/093266 discloses a tire having a body part comprising a groove whose groove width changes at a prescribed repeated frequency along tire circumferential orientation for improving drainage performance while decreasing uneven wear generation and maintaining steering stability.
  • WO2012/147191 discloses a tire having a groove provided with a plurality of closing devices (a plurality of flexible fences) being attached to a plurality of recessed portions having an opening which opens in the groove for better optimization of noise attenuation and drainage performance.
  • 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 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 opening to the contact face and having two opposed wall surfaces being connected to one another by a bottom surface, the at least one principal groove having a depth D when the tread being brand new and a width W at the level of the contact face, the at least one principal groove being provided with a plurality of flexible fences each having a thickness E and extending radially outwardly from the bottom surface as to occupy at least 60% of cross-sectional area of the principal groove and being distant from the two opposed wall surfaces, the at least one principal groove is provided with at least one depression portion of a width Dd formed on at least one of the two opposed wall surfaces as to widen the width W of the principal groove, and the at least one principal groove has a maximum width W” wider than the width W at radially inward from the contact face when the tread is brand new.
  • This arrangement provides an improvement on drainage performance till and at an end of tire life with an improvement of groove resonance while maintaining endurance performance.
  • the tread is provided with at least one principal groove opening to the contact face and having two opposed wall surfaces being connected to one another by the bottom surface being provided with the plurality of flexible fences each having the thickness E and extending radially outwardly from the bottom surface as to occupy at least 60% of cross-sectional area of the principal groove and being distant from the two opposed wall surfaces, a length of the air column of the principal groove formed with the road surface is different from that formed in case there is no flexible fence, and the peak of groove resonance is shifted to an outside of the frequency range audible to the human ear. As a result, groove resonance due to air column resonance of the principal groove can be improved.
  • the at least one principal groove is provided with at least one depression portion of a width Dd formed on at least one of the two opposed wall surfaces as to widen the width W of the principal groove, and the at least one principal groove has a maximum width W” wider than the width W at radially inward from the contact face when the tread is brand new, the depression portion would be able to act as an extra space for evacuating water in the principal groove even under reduced tread depth due to wear and the flexible fence becomes difficult to bend. As a result, drainage capability of the principal groove is secured till and at the end of tire life.
  • the at least one depression portion formed on at least one of the two opposed wall surfaces is provided as to widen the width of the principal groove, no extra rubber would be required for maintaining endurance performance of the tire. As a result, endurance performance will be maintained while maintaining rolling resistance performance.
  • the at least one principal groove has a minimum width W’ narrower than the width W at radially inward from the contact face when the tread is brand new.
  • a height on which the minimum width W’ of the principal groove locates on or radially outward from the bottom surface is at most equal to 50% of the depth D, and a height on which the maximum width W” of the principal groove locates is equal to or radially inward of the height on which the minimum width W’ of the principal groove locates.
  • the depression portion has a length Ld along with the principal groove, and at least one of the flexible fence among the plurality of flexible fences is provided at a position in the principal groove corresponding to a center region CR of the depression portion.
  • the flexible fence is provide at a position in the principal groove corresponding to outside of the center region CR of the depression portion, there is a risk that the flexible fence cannot bend properly with an action of fluid flowing in the principal groove for let such fluid to be evacuated.
  • the “center region CR” is a region of the depression portion positioned at a center when the depression portion is divided into trisections along the principal groove.
  • the length Ld of the depression portion is at least equal to twice the depth D and at most equal to 50.0 mm.
  • this length Ld of the depression portion is less than twice the depth D, there is a risk that the flexible fence cannot bend properly with an action of fluid flowing in the principal groove for let such fluid to be evacuated. If this length Ld of the depression portion is more than 50.0 mm, there is a risk that degradation of handling performance would become non-negligible.
  • the width Dd of the depression portion is at least equal to 2.0 mm and at most equal to 5.0 mm.
  • this width Dd of the depression portion is less than 2.0 mm, there is a risk that drainage capability of the principal groove close to the end of tire life would be insufficient. If this width Dd of the depression portion is more than 5.0 mm, there is a risk that degradation of handling performance would become non-negligible.
  • the depression portion is provided on both the two opposed wall surfaces.
  • Fig. 1 is a schematic view of a portion of a tread 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
  • Fig. 4 is a schematic view of a portion of a tread according to a third embodiment of the present invention
  • Fig. 5 is a schematic cross sectional view taken along line VI-VI in Fig. 4
  • Fig. 6 is a schematic view of a portion of a tread after wear (at remaining tread depth of 2.0 mm) according to a third embodiment of the present invention
  • a tire 1 according to a first embodiment of the present invention will be described referring to Fig. 1 and Fig. 2.
  • Fig. 1 is a schematic view of a portion of a tread 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 shown in the figure 1 is a half of a portion of the tread divided with respect to a center line C-C’ extending in circumferential orientation.
  • the tread 1 is a tire having dimension 205/55R16 provided with at least one principal groove 3 extending in in tire circumferential orientation and opening to a contact face 2 intended to come into contact with ground during rolling.
  • the principal groove 3 is delimited by two opposed wall surfaces 31, 32 facing each other and being connected by a bottom surface 33.
  • the principal groove 3 has a width W at a level of the contact face 2 (shown in Fig. 2) when the tread 1 is brand new, and a maximum width W” wider than the width W at radially inward from the contact face (shown in Fig. 2).
  • a plurality of flexible fences 4 each having a thickness E is provided in the principal groove 3.
  • the plurality of flexible fences 4 in the same principal groove 3 is spaced from each other in circumferential orientation of the principal groove 3.
  • the at least one principal groove 3 is provided with at least one depression portion 5 of a width Dd formed on at least one of the two opposed wall surfaces 31, 32 as to widen the width W of the principal groove 3.
  • each the opposed wall surfaces 31, 32 have one depression portion 5 widening constantly the width W of the principal groove 3 along the principal groove 3.
  • the width W of the principal groove 3 at the level of contact face 2 when the tread 1 being brand new is 12.0 mm
  • the maximum width W” of the principal groove 3 is 17.0 mm
  • the width Dd of the depression portion 5 is 2.5 mm provided symmetrically on the two opposed wall surfaces 31, 32.
  • the principal groove 3 having a depth D; a radial distance between the contact face 2 and the bottom surface 33 of the principal groove 3 when the tread being brand new.
  • the flexible fence 4 being attached to the bottom surface 33 and extending radially outwardly from the bottom surface 33 toward a level just below the contact face 2 as to occupy at least 60% of cross-sectional area of the principal groove 3 and being distance from the two opposed wall surface 31, 32.
  • the width W of the principal groove 3 is widened linearly from the contact face 2 toward the bottom surface 33 by the two depression portions 5 and two opposed wall surfaces 31, 32 are both inclined as to widen the width W of the principal groove 3 from the contact face 2 toward the bottom face 33 of the principal groove 3.
  • this width W of the principal groove 3 has the maximum width W” at a level of the bottom surface 33.
  • the tread 1 is provided with at least one principal groove 3 opening to the contact face 2 and having two opposed wall surfaces 31, 32 being connected to one another by the bottom surface 33 being provided with the plurality of flexible fences 4 each having the thickness E and extending radially outwardly from the bottom surface 33 as to occupy at least 60% of cross-sectional area of the principal groove 3 and being distant from the two opposed wall surfaces 31, 32, a length of the air column of the principal groove 3 formed with the road surface is different from that formed in case there is no flexible fence, and the peak of groove resonance is shifted to an outside of the frequency range audible to the human ear. As a result, groove resonance due to air column resonance of the principal groove 3 can be improved.
  • the at least one principal groove 3 is provided with at least one depression portion 5 of a width Dd formed on at least one of the two opposed wall surfaces 31, 32 as to widen the width W of the principal groove 3, and the at least one principal groove 3 has a maximum width W” wider than the width W at radially inward from the contact face 2 when the tread is brand new, the depression portion 5 would be able to act as an extra space for evacuating water in the principal groove 3 even under reduced tread depth due to wear and the flexible fence 4 becomes difficult to bend. As a result, drainage capability of the principal groove 3 is secured till and at the end of tire life.
  • the at least one depression portion 5 formed on at least one of the two opposed wall surfaces 31, 32 is provided as to widen the width of the principal groove 3, no extra rubber would be required for maintaining endurance performance of the tire. As a result, endurance performance will be maintained while maintaining rolling resistance performance.
  • the width Dd of the depression portion 5 is at least equal to 2.0 mm and at most equal to 5.0 mm. If this width Dd of the depression portion 5 is less than 2.0 mm, there is a risk that drainage capability of the principal groove 3 close to the end of tire life would be insufficient. If this width Dd of the depression portion 5 is more than 5.0 mm, there is a risk that degradation of handling performance would become non-negligible. By setting this Dd of the depression portion 5 at least equal to 2.0 mm and at most equal to 5.0 mm, it is possible to minimize an impact on handling performance due to existence of the depression portion 5, while improving groove resonance due to air column resonance of the principal groove 3 and maintaining drainage capability of the principal groove 3 till and at the end of tire life with maintained endurance and rolling resistance performance.
  • the depression portion 5 is provided on both the two opposed wall surfaces 31, 32, it is possible to properly secure drainage capability of the principal groove 3 close to the end of tire life as the depression portions 5 act as extra volume for let the fluid to be evacuated even the flexible fence 4 being difficult to bend.
  • the depression portion 5 may be provided only on one of the two opposed wall surfaces 31, 32, or may be provided on both the two opposed wall surfaces 31, 32 asymmetrically in shape or in depth Dd.
  • the two opposed wall surface 31, 32 delimiting the depression portion 5 may extend linearly, curvilinearly (concavely or convexly) or as to combine multiple straight lines and/or arcs.
  • Fig. 3 is a schematic cross sectional view according to a second embodiment of the present invention.
  • the constitution of the 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.
  • At least one principal groove 23 has a minimum width W’ narrower than a width W at radially inward from a contact face 22 when a tread 21 is brand new, and a height on which the minimum width W’ of the principal groove 23 locates radially outermost from a bottom surface 233 is at most equal to 50% of a depth D, and a height on which a maximum width W” of the principal groove 23 locate is equal to or radially inward of the height on which the minimum width W’ of the principal groove 23 locates.
  • a plurality of flexible fence 24 being attached to the bottom surface 233 and extending radially outwardly from the bottom surface 233 toward a level just below the contact face 22 as to occupy at least 60% of cross-sectional area of the principal groove 23 and being distance from the two opposed wall surface 231, 232.
  • the width W of the principal groove 23 is narrowed linearly from the contact face 22 toward the bottom surface 233 till reaching to the height on which the minimum width W’ of the principal groove 23 locates radially outermost from the bottom surface 233 that is at most equal to 50% of the depth D.
  • a depression portion 25 of a width Dd is formed on both two opposed wall surfaces 231, 232 below the height on which the minimum width W’ of the principal groove 23 locates as to widen the width W of the principal groove 23 concavely until the bottom surface 233 of the principal groove 23.
  • the principal groove 23 with two depression portions 25 has the maximum width W” just radially outward from the bottom surface 233.
  • At least one principal groove 23 has the minimum width W’ narrower than the width W at radially inward from the contact face 22 when the tread 21 is brand new, it is possible to minimize an impact on handling performance due to existence of the depression portion 25, while improving groove resonance due to air column resonance of the principal groove 23 and maintaining drainage capability of the principal groove 23 till and at the end of tire life with maintained endurance and rolling resistance performance.
  • FIG. 4 is a schematic view of a portion of a tread according to a third embodiment of the present invention.
  • Fig. 5 is a schematic cross sectional view taken along line VI-VI in Fig. 4.
  • Fig. 6 is a schematic view of a portion of a tread after wear (at remaining tread depth of 2.0 mm) according to a third embodiment of the present invention.
  • the constitution of the third embodiment is similar to that of the first and the second embodiments other than the arrangement shown in Figs. 4 to 6, thus description will be made referring to Figs. 4 to 6.
  • the tread 51 having a principal groove 53 opening to a contact face 52 being provided with a depression portion 55 of a width Dd
  • the depression portion 55 has a length Ld along with the principal groove 53
  • at least one of a flexible fence of a thickness E among a plurality of flexible fences 54 is provided at a position in the principal groove 53 corresponding to a center region CR of the depression portion 55.
  • the “center region CR” is a region of the depression portion 53 positioned at a center when the depression portion 55 is divided into trisections along the principal groove 53.
  • the length Ld of the depression portion 55 is at least equal to twice a depth D (shown in Fig. 5) and at most equal to 50.0 mm.
  • the principal groove 53 is provided with the depression portion 55 on both two opposed wall surfaces 531, 532 as to widen the width W of the principal groove 53 partly till a maximum width W” of the principal groove 53.
  • a minimum width W’ narrower than the width W of the principal groove 53 is on a bottom surface 533 of the principal groove 53 where no depression portion is provided.
  • the depression portion 55 widen the width W of the principal groove 53, along with the principal groove 53, concavely until reaching to the maximum width W”, extends circumferentially as to keep the maximum width W” of the principal groove 55, then concavely as to go back to the width W.
  • a plurality of flexible fence 54 being attached to the bottom surface 533 and extending radially outwardly from the bottom surface 533 toward a level just below the contact face 52 as to occupy at least 60% of cross-sectional area of the principal groove 53 and being distance from the two opposed wall surface 531, 532
  • the width W of the principal groove 53 is narrowed linearly from the contact face 52 toward the bottom surface 533 until the bottom surface 533 where no depression portion is provided, the height on which the minimum width W’ of the principal groove 53 locates on the bottom.
  • the depression portion 55 of the width Dd is formed on both two opposed wall surfaces 531, 532 below 50% of the depth D as to widen the width W of the principal groove 53 concavely till reaching to the maximum width W” of the principal groove 53 then radially till the bottom surface 533 of the principal groove 53 as to keeping the maximum width W”.
  • a shape of the principal groove 53 becomes wavy-like shape, creating sufficient space for evacuating water in the principal groove 53 between flexible fence 54 and the two opposed wall surfaces 531, 532 of the principal groove 53 even under reduced tread depth due to wear and the flexible fence 54 becomes difficult to bend, thanks to the depression portion 55.
  • the height on which the minimum width W’ of the principal groove 53 locates on or radially outward from the bottom surface 533 is at most equal to 50% of the depth D, and the height on which the maximum width W” of the principal groove l53 locates is equal to or radially inward of the height on which the minimum width W’ of the principal groove 53 locates, it is possible to minimize further an impact on handling performance due to existence of the depression portion 55, while improving groove resonance due to air column resonance of the principal groove 53 and maintaining drainage capability of the principal groove 53 till and at the end of tire life with maintained endurance and rolling resistance performance.
  • the depression portion 55 has the length Ld along with the principal groove 53, and at least one of the flexible fence among the plurality of flexible fences 54 is provided at a position in the principal groove 53 corresponding to the center region CR of the depression portion 55, it is possible to minimize still further an impact on handling performance due to existence of the depression portion 55, while improving groove resonance due to air column resonance of the principal groove 53 and maintaining drainage capability of the principal groove 53 till and at the end of tire life with maintained endurance and rolling resistance performance.
  • the flexible fence 54 is provide at a position in the principal groove 53 corresponding to outside of the center region CR of the depression portion 55, there is a risk that the flexible fence 54 cannot bend properly with an action of fluid flowing in the principal groove 53 for let such fluid to be evacuated.
  • the length Ld of the depression portion 55 is at least equal to twice the depth D and at most equal to 50.0 mm, it is possible to minimize an impact on handling performance due to existence of the depression portion 55, while improving groove resonance due to air column resonance of the principal groove 53 and maintaining drainage capability of the principal groove 53 till and at the end of tire life with maintained endurance and rolling resistance performance.
  • this length Ld of the depression portion 55 is less than twice the depth D, there is a risk that the flexible fence 54 cannot bend properly with an action of fluid flowing in the principal groove 53 for let such fluid to be evacuated. If this length Ld of the depression portion 55 is more than 50.0 mm, there is a risk that degradation of handling performance would become non-negligible.
  • the depression portion 55 may extend linearly, curvilinearly (concavely or convexly) or as to combine multiple straight lines and/or arcs along the principal groove 53.
  • a shape of the depression portion 55 in a plan view may be asymmetric in axial orientation or in circumferential orientation.

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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, la bande de roulement étant pourvue d'au moins une rainure principale, la ou les rainures principales présentant une profondeur D lorsque la bande de roulement est neuve et une largeur W au niveau de la face de contact, et étant pourvues d'une pluralité de barrières flexibles s'étendant radialement vers l'extérieur à partir d'une surface inférieure de manière à occuper au moins 60 % de la surface transversale de la rainure principale et étant situées à une certaine distance de deux surfaces de paroi opposées. La ou les rainures principales sont pourvues d'au moins une partie en creux d'une largeur Dd formée sur au moins l'une des deux surfaces de paroi opposées de façon à élargir la largeur W de la rainure principale, la ou les rainures principales présentant une largeur maximale W" plus large que la largeur W au moins radialement vers l'intérieur à partir de la face de contact lorsque la bande de roulement est neuve.
PCT/JP2017/039236 2017-10-31 2017-10-31 Pneu avec dispositif de fermeture de rainure WO2019087272A1 (fr)

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PCT/JP2017/039236 WO2019087272A1 (fr) 2017-10-31 2017-10-31 Pneu avec dispositif de fermeture de rainure

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PCT/JP2017/039236 WO2019087272A1 (fr) 2017-10-31 2017-10-31 Pneu avec dispositif de fermeture de rainure

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02114006A (ja) * 1988-10-24 1990-04-26 Bridgestone Corp 空気入りタイヤ
JP2006341655A (ja) * 2005-06-07 2006-12-21 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2010260412A (ja) * 2009-04-30 2010-11-18 Bridgestone Corp タイヤ
US20130292020A1 (en) * 2010-12-02 2013-11-07 Michelin Recherche Et Technique S.A. Noise-reducing device intended to be inserted into a groove in the tread of a tire and tire comprising a device of this type
US20160332490A1 (en) * 2014-01-17 2016-11-17 Compagnie Generale Des Etablissements Michelin Ribbed anti-noise device for a tire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02114006A (ja) * 1988-10-24 1990-04-26 Bridgestone Corp 空気入りタイヤ
JP2006341655A (ja) * 2005-06-07 2006-12-21 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2010260412A (ja) * 2009-04-30 2010-11-18 Bridgestone Corp タイヤ
US20130292020A1 (en) * 2010-12-02 2013-11-07 Michelin Recherche Et Technique S.A. Noise-reducing device intended to be inserted into a groove in the tread of a tire and tire comprising a device of this type
US20160332490A1 (en) * 2014-01-17 2016-11-17 Compagnie Generale Des Etablissements Michelin Ribbed anti-noise device for a tire

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