WO2018199273A1 - Bande de roulement réduisant le bruit - Google Patents

Bande de roulement réduisant le bruit Download PDF

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Publication number
WO2018199273A1
WO2018199273A1 PCT/JP2018/017117 JP2018017117W WO2018199273A1 WO 2018199273 A1 WO2018199273 A1 WO 2018199273A1 JP 2018017117 W JP2018017117 W JP 2018017117W WO 2018199273 A1 WO2018199273 A1 WO 2018199273A1
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WO
WIPO (PCT)
Prior art keywords
protrusion
groove
tread
opposed
slots
Prior art date
Application number
PCT/JP2018/017117
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English (en)
Inventor
Kenji Fukuda
Original Assignee
Compagnie Generale Des Etablissements Michelin
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Filing date
Publication date
Application filed by Compagnie Generale Des Etablissements Michelin filed Critical Compagnie Generale Des Etablissements Michelin
Publication of WO2018199273A1 publication Critical patent/WO2018199273A1/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
    • 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
    • B60C2011/1338—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
    • 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 tread for a tire, in particular to a tread for a tire having a device for attenuating a noise generated by groove resonance in a groove possible to wear out similarly as the tread while ensuring a good productivity.
  • 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.
  • the length of the air column is reduced so as to be shorter than the total length of the groove in a contact patch, which leads to change the frequency of the 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 provided with a plurality of flexible fence extending radially from a groove bottom.
  • JP2004-181980 discloses a tire provided with a plurality of beard-shaped projections extending radially from a groove bottom.
  • the flexible fence or the beard-shaped projections since a thickness of the flexible fence or the beard-shaped projections measured in a direction the groove extends is thin and thus such the flexible fence or the beard-shaped projections deform easily, the flexible fence or the beard-shaped projections tend to wear less than a tread portion during rolling that would result a difference in an amount of wear. Due to such the difference in wear amount, the flexible fence or the beard-shaped projection protrude from a surface of the tread portion. The flexible fence or the beard-shaped projection protruding from the surface of the tread portion strike road surface to generate an abnormal noise. An occurrence of such the abnormal noise contradicts the original role of the flexible fence or the beard-shaped projection; reduction of the noise by reducing the air column resonance.
  • 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.
  • 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 groove of a radial depth D and a width W being composed of two opposed groove walls and a groove bottom connecting radially innermost of the two opposed groove walls, the groove having at least one protrusion protruding radially from the groove bottom with a radial height h, the protrusion having two opposed protrusion faces distant with a length L, each the two opposed protrusion faces facing to a direction the groove provided with the protrusion extends, and a protrusion top face connecting radially outermost of the two opposed protrusion faces, the protrusion having at least two slots of a radial depth d and a width w, each opening to the protrusion top face and the two opposed protrusion faces, the radial height h of the protrusion is at least equal to 75% of the radial depth D of the groove provided with the protrusion.
  • This arrangement provides improvement of noise due to air column resonance without generating an abnormal noise during usage while maintaining good productivity of such the tread.
  • the groove is provided with at least one protrusion protruding radially from the groove bottom. Therefore, the length of the air column of the groove formed with the road surface is different from that formed in case there is no protrusion, 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 groove can be improved.
  • the protrusion is provided as to have two opposed protrusion faces distant with a length L , the protrusion is constituted by sufficiently large amount of rubber-based material to resist from deformation, the protrusion is able to wear similarly as the tread. As a result, the tread provided with the protrusion would not generate an abnormal noise during usage.
  • the protrusion has at least two slots each opens to the protrusion top face and the two opposed protrusion faces, a sound wave propagating in the groove touches more surfaces as it passes through the slots, and energy of the sound wave is attenuated. As a result, groove resonance due to air column resonance of the groove can further be improved.
  • These at least two slots each opens to the protrusion top face and the two opposed protrusion faces make it possible to secure necessary drainage capability of the groove provided with the protrusion for safety.
  • the protrusion is protruding radially from the groove bottom and the slots opens to the protrusion top face, manufacturing of the tread provided with the protrusion having the slots in the groove doesn’t deteriorate productivity as such the configuration doesn’t hinder an opening of a mold for manufacturing the tread.
  • Sufficiently large amount of rubber-based material for forming the protrusion makes it easier to flow the rubber-based material into a molding part for molding the protrusion and to evacuate air trapped in the molding part during molding of the protrusion.
  • the radial height h of the protrusion is at least equal to 75% of the radial depth D of the groove provided with the protrusion, it is possible to achieve improvement of groove resonance due to air column resonance.
  • the radial height h of the protrusion is less than 75% of the radial depth D of the groove provided with the protrusion, there is a risk that coverage of sectional area of the groove provided by the protrusion becomes insufficient which results insufficient groove resonance reduction.
  • This radial height h of the protrusion is preferably at least equal to 80% of the radial depth D of the groove provided with the protrusion, more preferably at least equal to 90% of the radial depth D of the groove provided with the protrusion.
  • the length L of the protrusion is at least equal to 8 mm in the direction the groove provided with the protrusion extends.
  • the length L of the protrusion is less than 8 mm, there is a risk that attenuation of sound wave energy due to air column resonance becomes insufficient which results insufficient groove resonance reduction because the sound wave propagating in the groove touches less surface when passes through the slots.
  • This length L of the protrusion is preferably at least equal to 10 mm in the direction the groove provided with the protrusion extends.
  • the protrusion is attached to at least one of the opposed groove walls.
  • the protrusion is attached to the two opposed groove walls.
  • the radial depth d of the slots from the protrusion top face is more than or equal to 75% of the radial height h of the protrusion.
  • the radial depth d of the slots from the protrusion top face is less than 75% of the radial height h of the protrusion, there is a risk that drainage capability of the groove provided with the protrusion for safety cannot be secured.
  • this radial depth d of the slots from the protrusion top face is at least equal to 75% of the radial height h of the protrusion, it is possible to secure necessary drainage capability of the groove provided with the protrusion for safety.
  • This radial depth d of the slots from the protrusion top face is preferably at least equal to 80% of the radial height h of the protrusion, more preferably at least equal to 90% of the radial height h of the protrusion.
  • the protrusion is provided as to at least 3 protrusions exist at least in one groove within a contact patch.
  • the protrusion is provided as to less than 3 protrusions exist at least in one groove within the contact patch, there is a risk that attenuation of energy of the sound wave propagating in the groove becomes insufficient resulting insufficient groove resonance reduction.
  • the protrusion By setting the protrusion being provided as to at least 3 protrusions exist at least in one groove within the contact patch, it is possible to achieve improvement of groove resonance due to air column resonance more reliably.
  • the width w of each the slots is at least equal to 1% of the width W of the groove provided with the protrusion.
  • each the slots is less than 1% of the width W of the groove provided with the protrusion, there is a risk that drainage capability of the groove provided with the protrusion for safety cannot be secured.
  • this width w of each the slots at least equal to 1% of the groove provided with the protrusion, it is possible to secure necessary drainage capability of the groove provided with the protrusion for safety.
  • This width w of each the slots is preferably at least equal to 1.5% of the width W of the groove provided with the protrusion, more preferably at least equal to 2% of the width W of the groove provided with the protrusion.
  • the protrusion has at least equal to 10 slots.
  • the protrusion has less than 10 slots, there is a risk that drainage capability of the groove provided with the protrusion for safety cannot be secured.
  • the protrusion By setting the protrusion as to have at least equal to 10 slots, it is possible to secure necessary drainage capability of the groove provided with the protrusion for safety.
  • the protrusion has preferably at least equal to 12 slots.
  • a tread for a tire provided with a noise reduction device in a groove such the tread can provide reduction of air column resonance without generating an abnormal noise during usage by wearing the noise reduction device in the groove similarly with the tread while maintaining productivity of such the tread.
  • Fig. 1 is a schematic view of a portion of a tread for a tire according to a first embodiment of the present invention
  • Fig. 2 is a schematic perspective view of a portion of the tread for a tire according to the first embodiment of the present invention
  • Fig. 3 is a schematic cross sectional view taken along line III-III in Fig. 1
  • Fig. 4 is a schematic view of a portion of a tread for a tire according to a second embodiment of the present invention
  • Fig. 5 is a schematic cross sectional view taken along line V-V in Fig. 4
  • Fig. 6 is a schematic view of a portion of a tread for a tire according to a third embodiment of the present invention
  • Fig. 7 is a schematic cross sectional view taken along line VII-VII in Fig. 6;
  • a tread 1 for a tire according to a first embodiment of the present invention will be described referring to Figs. 1, 2 and 3.
  • Fig. 1 is a schematic view of a portion of a tread for a tire according to a first embodiment of the present invention.
  • Fig.2 is a schematic perspective view of a portion of the tread for a tire according to the first embodiment of the present invention.
  • Fig. 3 is a schematic cross sectional view taken along line III-III 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 two grooves 3 extending generally in circumferential orientation indicated as XX’.
  • the grooves 3 are delimited by two opposed groove walls 31, 32 facing each other and being connected by a groove bottom 33 connecting radially innermost of the two opposed groove walls 31, 32.
  • the groove 3 has a width W at a level of the contact face 2 and a depth D (as shown in Fig. 3). In the present embodiment, the width W of the groove 3 is 20 mm, the depth D of the groove 3 is 8 mm.
  • a contact patch 6 has a contact patch length LCP in a tire circumferential orientation when the tire with the tread 1 is mounted onto its standard rim and inflated at its nominal pressure and its nominal load is applied.
  • the standard rim for this size is 7.5J
  • the nominal pressure is 250kPa
  • the nominal load is 615kg.
  • a plurality of protrusion 4 protruding from the groove bottom 33 with a radial height h is provided for dividing an air column created between the ground and the groove 3 in the contact patch 6 during rolling.
  • Each protrusion 4 has two opposed protrusion faces 41, 42 distant with a length L and facing to a direction the groove 3 extends, and a protrusion top face 43 connecting radially outermost of the two opposed protrusion faces 41, 42.
  • the protrusion 4 is attached to the two opposed groove walls 31, 32, as shown in Fig. 2.
  • Each protrusion 4 is spaced from each other by distance P (distance between one of the two opposed protrusion face 41, 42 of one protrusion 4 and corresponding one of the two opposed protrusion face 41, 42 of adjacent protrusion 4) in the direction the groove 3 extends.
  • the distance P is preferably, in relation with the length L, set as to at least 3 protrusions 4 exist at least in one groove 3 within the contact patch 6.
  • the length L of the protrusion 4 in the direction the groove 3 provided with the protrusion 4 extends is 10 mm
  • the distance P is 40 mm
  • the radial height h of the protrusion 4 is 6.7 mm.
  • the protrusion 4 is provided with three slots (or slits) 5 of a radial depth d from the protrusion top face 43 and a width w (shown in Fig. 3), each opens to the protrusion top face 43 and the two opposed protrusion faces 41, 42.
  • the radial depth d of the slot (or slit) 5 from the protrusion top face 43 is 6 mm
  • the width w of the slot (or slit) 5 is 1 mm.
  • the protrusion top face 43 is offset radially inwardly from the contact face 2. Also, a radially innermost of the slots (or slits) 5 is offset radially outwardly from the groove bottom 33.
  • the groove 3 is provided with at least one protrusion 4 protruding radially from the groove bottom 33, the length of the air column of the groove 3 formed with the road surface is different from that formed in case there is no protrusion 4, and the peak of groove resonance is shifted to an outside of the frequency range audible to the human ear, thus groove resonance due to air column resonance of the groove 3 is improved.
  • the protrusion 4 is provided as to have two opposed protrusion faces 41, 42 distant with a length L, the protrusion 4 is constituted by sufficiently large amount of rubber-based material to resist from deformation, the protrusion 4 is able to wear similarly as the tread 1, thus the tread 1 provided with the protrusion 4 would not generate an abnormal noise during usage.
  • the protrusion 4 has at least two slots (or slits) 5 each opens to the protrusion top face 43 and the two opposed protrusion faces 41, 42, a sound wave propagating in the groove 3 touches more surfaces as it passes through the slots (or slits) 5, and energy of the sound wave is attenuated, thus groove resonance due to air column resonance of the groove 3 can further be improved.
  • These at least two slots (or slits) 5 each opens to the protrusion top face 43 and the two opposed protrusion faces 41, 42 make it possible to secure necessary drainage capability of the groove 3 provided with the protrusion 4 for safety.
  • the protrusion 4 is protruding radially from the groove bottom 33 and the slots (or slits) 5 opens to the protrusion top face 43, manufacturing of the tread 1 provided with the protrusion 4 having the slots (or slits) 5 in the groove 3 doesn’t deteriorate productivity as such the configuration doesn’t hinder an opening of a mold for manufacturing the tread 1.
  • Sufficiently large amount of rubber-based material for forming the protrusion 4 makes it easier to flow the rubber-based material into a molding part for molding the protrusion 4 and to evacuate air trapped in the molding part during molding of the protrusion 4.
  • the length L of the protrusion 4 is at least equal to 8 mm in the direction the groove 3 provided with the protrusion 4 extends, it is possible to achieve improvement of groove resonance due to air column resonance. If the length L of the protrusion 4 is less than 8 mm, there is a risk that attenuation of sound wave energy due to air column resonance becomes insufficient which results insufficient groove resonance reduction because the sound wave propagating in the groove 3 touches less surface when passes through the slots (or slits) 5 on the protrusion 4.
  • This length L of the protrusion 4 is preferably at least equal to 10 mm in the direction the groove 3 provided with the protrusion 4 extends.
  • the radial height h of the protrusion 4 is at least equal to 75% of the radial depth D of the groove 3 provided with the protrusion 4, it is possible to achieve improvement of groove resonance due to air column resonance. If the radial height h of the protrusion 4 is less than 75% of the radial depth D of the groove 3 provided with the protrusion 4, there is a risk that coverage of sectional area of the groove 3 provided by the protrusion 4 becomes insufficient which results insufficient groove resonance reduction.
  • This radial height h of the protrusion 4 is preferably at least equal to 80% of the radial depth D of the groove 3 provided with the protrusion 4, more preferably at least equal to 90% of the radial depth D of the groove 3 provided with the protrusion 4.
  • the protrusion 4 is attached to the two opposed groove walls 31, 32, it is possible to wear the protrusion 4 similarly as the tread 1 reliably as deformation resistance of the protrusion 4 is supported by the two opposed groove walls 31, 32 attached.
  • the radial depth d of the slots (or slits) 5 from the protrusion top face 43 is more than or equal to 75% of the radial height h of the protrusion 4, it is possible to secure necessary drainage capability of the groove 3 provided with the protrusion 4 for safety. If the radial depth d of the slots (or slits) 5 from the protrusion top face 43 is less than 75% of the radial height h of the protrusion 4, there is a risk that drainage capability of the groove 3 provided with the protrusion 4 for safety cannot be secured.
  • This radial depth d of the slots (or slits) 5 from the protrusion top face 43 is preferably at least equal to 80% of the radial height h of the protrusion 4, more preferably at least equal to 90% of the radial height h of the protrusion 4.
  • the protrusion 4 is provided as to at least 3 protrusions 4 exist at least in one groove 3 within a contact patch 6, it is possible to achieve improvement of groove resonance due to air column resonance more reliably. If the protrusion 4 is provided as to less than 3 protrusions 4 exist at least in one groove 3 within the contact patch 6, there is a risk that attenuation of energy of the sound wave propagating in the groove 3 becomes insufficient resulting insufficient groove resonance reduction.
  • each the slots (or slits) 5 is at least equal to 1% of the width W of the groove 3 provided with the protrusion 4, it is possible to secure necessary drainage capability of the groove 3 provided with the protrusion 4 for safety. If the width w of each the slots (or slits) 5 is less than 1% of the width W of the groove 3 provided with the protrusion 4, there is a risk that drainage capability of the groove 3 provided with the protrusion 4 for safety cannot be secured.
  • This width w of each the slots (or slits) 5 is preferably at least equal to 1.5% of the width W of the groove 3 provided with the protrusion 4, more preferably at least equal to 2% of the width W of the groove 3 provided with the protrusion 4.
  • a sum of the width w of the slots (or slits) 5 in one protrusion 4 may be between 10% and 50% of the width W of the groove 3 for achieving improvement of groove resonance due to air column resonance and for securing necessary drainage capability of the groove 3 provided with the protrusion 4 for safety simultaneously.
  • the opposed protrusion faces 41, 42 may be provided in curved, waved, zigzagged or any other form.
  • the protrusion top face 43 may be provided in curved, waved, zigzagged, concave, convex or any other form.
  • the slots (or slits) 5 may be provided in curved, waved or zigzagged form in the direction the groove 3 provided with the protrusion 4 extends, in radial direction or in both the groove 3 provided with the protrusion 4 extends and radial directions.
  • the protrusion 4 may be provided with a combination of various form, various width w , various depth d and/or various angle relative to circumferential orientation of the slots (or slits) 5 in one protrusion 4.
  • FIG. 4 is a schematic view of a portion of a tread for a tire according to a second embodiment of the present invention.
  • Fig. 5 is a schematic cross sectional view taken along line V-V in Fig. 4.
  • the tread 21 is provided with an obliquely extending curved groove 23 delimited by two opposed groove walls 231, 232 facing each other and being connected by a groove bottom 233 connecting radially innermost of the two opposed groove walls 231, 232.
  • a protrusion 24 protruding from the groove bottom 233 with a radial height h is provided for dividing an air column created between ground and the groove 23 during rolling.
  • the protrusion 24 has two opposed protrusion faces 241, 242 distant with a length L and facing to a direction the groove 23 extends, and a protrusion top face 243 connecting radially outermost of the two opposed protrusion faces 241, 242.
  • the protrusion 24 is attached to one of the two opposed groove walls 232 but not to another one of the two opposed groove walls 231.
  • the length L of the protrusion 24 is measured as a minimum distance between the protrusion faces 241, 242 along the groove 23.
  • the protrusion 24 is provided with five slots (or slits) 25 of a radial depth d from the protrusion top face 243 and a width w (shown in Fig. 5) extending similarly as the groove 23 extends, each opens to the protrusion top face 243 and the two opposed protrusion faces 241, 242.
  • a radial height h of the protrusion 24 is equal to a depth D of the groove 23, that is to say that the protrusion top face 243 is radially at the same level as a contact face 22 of the tread 21.
  • the radial depth d of the slots (or slits) 25 from the protrusion top face 243 is different with the radial height h of the protrusion 24 but is more than or equal to 75% of the radial height h of the protrusion 24.
  • One slot (or slit) 25 closest to one of the opposed groove wall 232 in which the protrusion 24 being attached is partly cut by one of the opposed groove wall 232.
  • the protrusion 24 is attached to at least one of the opposed groove walls 231, 232, it is possible to wear the protrusion 24 similarly as the tread 21 more reliably as deformation resistance of the protrusion 24 is supported by at least one of the opposed groove walls 231, 232 attached.
  • the protrusion 24 may be provided as to attach alternately to one of the opposed groove walls 231, 232.
  • FIG. 6 is a schematic view of a portion of a tread for a tire according to a third embodiment of the present invention.
  • Fig. 7 is a schematic cross sectional view taken along line VII-VII in Fig. 6.
  • the tread 51 is provided with a main groove 53(a) extending in circumferential orientation which is top-bottom orientation in Fig. 6 and a groove 53 opening to the main groove 53(a) and extending to transverse orientation which is left-right orientation in Fig. 6.
  • the groove 53 is delimited by two opposed groove walls 531, 532 facing each other and being connected by a groove bottom 533 connecting radially innermost of the two opposed groove walls 531, 532.
  • a protrusion 54 protruding from the groove bottom 533 with a radial height h (shown in Fig. 7) is provided for dividing an air column created between ground and the groove 53 during rolling.
  • the protrusion 54 has two opposed protrusion faces 541, 542 distant with a length L and facing to a direction the groove 53 extends, and a protrusion top face 543 connecting radially outermost of the two opposed protrusion faces 541, 542. Both the two opposed protrusion faces 541, 542 slants toward the groove bottom 533 as to extend a distance between two opposed protrusion faces 541, 542 for supporting a rigidity of the protrusion 54.
  • the protrusion 54 is provided with thirteen slots (or slits) 55 of a radial depth d from the protrusion top face 543 and a width w (shown in Fig. 7) extending as to share an opening to the two opposed protrusion faces 541, 542 with adjacent slot (or slit) 55 except those closest to the opposed groove walls 531, 532.
  • a radial height h of the protrusion 54 is equal to a depth D of the groove 53, that is to say that the protrusion top face 543 is radially at the same level as a contact face 52 of the tread 51.
  • the radial depth d of the slots (or slits) 55 from the protrusion top face 543 is also equal to the depth D of the groove 53 thus equal to the radial height h of the protrusion 54.
  • the width w of the slot (or slit) 55 is decreasing toward the groove bottom 533.
  • the protrusion 54 has at least equal to 10 slots (or slits) 55, it is possible to secure necessary drainage capability of the groove 53 provided with the protrusion 54 for safety. If the protrusion 54 has less than 10 slots 55, there is a risk that drainage capability of the groove 53 provided with the protrusion 54 for safety cannot be secured.
  • the protrusion 54 has preferably at least equal to 12 slots (or slits) 55.
  • the Example 1 was a pneumatic tire as described in the above first embodiment but provided with the protrusion having the height h equals to the depth D of the groove (that is to say 8 mm) and 10 (ten) slots (or slits) of the width w equals to 0.4 mm and the depth d equals to the height h of the protrusion (that is to say 8 mm also), the Example 2 was also a pneumatic tire as described in the above first embodiment but provided with the protrusion having the height h equals to the depth D of the groove (that is to say 8 mm) and 20 (twenty) slots (or slits) of the width w equals to 0.2 mm and the depth d equals to the height h of the protrusion (that is to say 8 mm also).
  • the Reference 1 was a pneumatic tire without the protrusion.
  • the Comparative Example was a pneumatic tire provided with a closing device of prior art as described in WO2010/063749. All the Examples, Reference and Comparative Example were made of the same rubber-based material, using the same typical radial tire construction for passenger car tire.
  • the tire dimension of the Examples, Comparative Example and Reference were all 225/45R17, mounted onto a rim of 7.5Jx17, and inflated to 180 kPa.
  • a sound pressure level of the unused test tires mounted onto abovementioned rim, inflated to abovementioned internal pressure were measured while applying a load of 452daN, running 90kph on a drum of 2.7m in diameter having ISO surface in a semi-anechoic chamber, via a microphone installed axially 1 m outward from a center of tire contact, radially 0.2m backward from a tire rolling axis and 0.32m in height.
  • the data acquired through the measurements were processed to calculate an absorption level of a sound between 600 and 1,300 Hz at which groove resonance frequency been contained.
  • the results are shown in table 1. In this table 1, results are represented by an index of 100 for Reference, higher the number indicates better the noise performance.

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  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La présente invention concerne une bande de roulement pour un pneu ayant une face de contact destinée à entrer en contact avec le sol pendant le roulement, pourvue d'au moins une rainure (3) d'une profondeur radiale D et d'une largeur W composée de deux parois à rainure opposées (31, 32) et d'un fond à rainure (33) reliant radialement la partie située le plus à l'intérieur des deux parois à rainure opposées (31, 32), la rainure ayant au moins une saillie (4) faisant saillie radialement à partir du fond à rainure (33) avec une hauteur radiale h ayant deux faces en saillie opposées (41, 42) distantes d'une longueur L, chacune des deux faces en saillie opposées (41, 42) faisant face à une direction vers laquelle s'étend la rainure comportant la saillie, et une face supérieure en saillie (43) reliant radialement la partie située le plus à l'extérieur des deux faces en saillie opposées (41, 42), la saillie (4) ayant au moins deux fentes (5) d'une profondeur radiale d et d'une largeur w, s'ouvrant toutes deux vers la face supérieure en saillie (43) et les deux faces en saillie opposées (41, 42), la hauteur radiale h de la saillie (4) étant au moins égale à 75 % de la profondeur radiale D de la rainure (3) pourvue de la saillie (4).
PCT/JP2018/017117 2017-04-27 2018-04-27 Bande de roulement réduisant le bruit WO2018199273A1 (fr)

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JP2017016688 2017-04-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021250331A1 (fr) 2020-06-11 2021-12-16 Compagnie Generale Des Etablissements Michelin Pneumatique émettant un bruit réduit
WO2022069822A1 (fr) 2020-09-29 2022-04-07 Compagnie Generale Des Etablissements Michelin Pneumatique comprenant une couche additionnelle pour réduire le bruit extérieur

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004181980A (ja) 2002-10-09 2004-07-02 Yokohama Rubber Co Ltd:The 空気入りタイヤ
WO2010063749A1 (fr) 2008-12-05 2010-06-10 Societe De Technologie Michelin Dispositif attenuateur de bruit pour bande de roulement
FR2955289A1 (fr) * 2010-01-19 2011-07-22 Michelin Soc Tech Bande de roulement de pneu comprenant un dispositif reducteur de bruit ameliore
WO2012072444A1 (fr) * 2010-12-02 2012-06-07 Societe De Technologie Michelin Dispositif antibruit destine a etre rapporte dans un sillon de la bande de roulement d'un pneumatique et pneumatique comportant un dispositif de ce type
US20130153104A1 (en) * 2011-12-14 2013-06-20 Todd A. Buxton Snow Performance Peaks
WO2016057149A1 (fr) * 2014-10-06 2016-04-14 Bridgestone Americas Tire Operations, Llc Élément de traction de pneu
JP2016113107A (ja) * 2014-12-17 2016-06-23 東洋ゴム工業株式会社 空気入りタイヤ
WO2017110663A1 (fr) * 2015-12-25 2017-06-29 Compagnie Generale Des Etablissements Michelin Bande de roulement réduisant le bruit
WO2017221283A1 (fr) * 2016-06-22 2017-12-28 Compagnie Generale Des Etablissements Michelin Élément de moulage pour la fabrication d'une bande de roulement à réduction de bruit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004181980A (ja) 2002-10-09 2004-07-02 Yokohama Rubber Co Ltd:The 空気入りタイヤ
WO2010063749A1 (fr) 2008-12-05 2010-06-10 Societe De Technologie Michelin Dispositif attenuateur de bruit pour bande de roulement
FR2955289A1 (fr) * 2010-01-19 2011-07-22 Michelin Soc Tech Bande de roulement de pneu comprenant un dispositif reducteur de bruit ameliore
WO2012072444A1 (fr) * 2010-12-02 2012-06-07 Societe De Technologie Michelin Dispositif antibruit destine a etre rapporte dans un sillon de la bande de roulement d'un pneumatique et pneumatique comportant un dispositif de ce type
US20130153104A1 (en) * 2011-12-14 2013-06-20 Todd A. Buxton Snow Performance Peaks
WO2016057149A1 (fr) * 2014-10-06 2016-04-14 Bridgestone Americas Tire Operations, Llc Élément de traction de pneu
JP2016113107A (ja) * 2014-12-17 2016-06-23 東洋ゴム工業株式会社 空気入りタイヤ
WO2017110663A1 (fr) * 2015-12-25 2017-06-29 Compagnie Generale Des Etablissements Michelin Bande de roulement réduisant le bruit
WO2017221283A1 (fr) * 2016-06-22 2017-12-28 Compagnie Generale Des Etablissements Michelin Élément de moulage pour la fabrication d'une bande de roulement à réduction de bruit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021250331A1 (fr) 2020-06-11 2021-12-16 Compagnie Generale Des Etablissements Michelin Pneumatique émettant un bruit réduit
WO2022069822A1 (fr) 2020-09-29 2022-04-07 Compagnie Generale Des Etablissements Michelin Pneumatique comprenant une couche additionnelle pour réduire le bruit extérieur

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