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WO2016002781A1 - Bande de roulement de pneu et pneu ayant ladite bande de roulement - Google Patents

Bande de roulement de pneu et pneu ayant ladite bande de roulement Download PDF

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Publication number
WO2016002781A1
WO2016002781A1 PCT/JP2015/068833 JP2015068833W WO2016002781A1 WO 2016002781 A1 WO2016002781 A1 WO 2016002781A1 JP 2015068833 W JP2015068833 W JP 2015068833W WO 2016002781 A1 WO2016002781 A1 WO 2016002781A1
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WIPO (PCT)
Prior art keywords
tire
tread
inclined main
width
notch
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2015/068833
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English (en)
Japanese (ja)
Inventor
福田　憲司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
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 Michelin Recherche et Technique SA Switzerland, Compagnie Generale des Etablissements Michelin SCA filed Critical Michelin Recherche et Technique SA Switzerland
Publication of WO2016002781A1 publication Critical patent/WO2016002781A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes

Definitions

  • the present invention relates to a tire tread and a tire having this tread, and more particularly to a tire tread that can improve drainage performance on a wet road surface and a tire having this tread.
  • a so-called low profile tire having a low ratio of height to width of a tire cross section, that is, a flatness ratio, has been generally used.
  • a low profile tire since the width of the tread portion is set wide, the drainage performance of the ground contact surface is deteriorated. For this reason, in order to improve drainage, a tire provided with an inclined main groove extending in a direction inclined with respect to the tire circumferential direction has been proposed.
  • the tire is provided with a notch (so-called sipe) that is inclined in the opposite direction to the inclined main groove with respect to the circumferential direction and extends between the inclined main grooves adjacent to the circumferential direction, thereby suppressing the occurrence of uneven wear.
  • sipe notch
  • a narrow circumferential auxiliary groove extending in the tire circumferential direction and communicating between adjacent inclined main grooves is provided.
  • a tire in which a chamfered portion is formed at the edge portion of the tire to improve drainage (see, for example, FIG. 1 of Patent Document 2).
  • Patent Document 3 a tire tread in which a chamfered portion is provided at an edge portion of a notch formed in the tread has been proposed.
  • the narrow circumferential sub-groove contributes to the removal of the water film on the ground contact surface of the block, but the water flowing in the narrow circumferential sub-groove is the water flowing in the inclined main groove. It is easy to interfere with. Further, the chamfered portion provided at the edge of the narrow circumferential sub-groove promotes this interference. As a result, there is a problem that bubbles are generated by the interference and the drainage performance cannot be sufficiently improved.
  • the chamfered portion provided at the edge portion of the cut is formed so as to improve the rolling resistance performance. Therefore, the effect that the chamfered portion improves drainage performance is extremely small.
  • the present invention has been made to solve the above-described problems of the prior art, and is capable of exhibiting a higher level of drainage performance while preventing uneven wear while using an inclined main groove.
  • An object is to provide a tread for use and a tire having the tread.
  • groove means two opposing surfaces (wall surface, side wall) that do not contact each other under normal use conditions, and another surface (bottom surface) that connects the lower ends of these opposing surfaces. ) And a space having a width, a depth and a length.
  • the “main groove” means a groove having a relatively wide width among various grooves formed in the tread and mainly responsible for drainage.
  • the grooves other than the “main groove” are referred to as “sub-grooves”.
  • a groove that continuously extends over the entire circumference in the tire circumferential direction is referred to as a “circumferential main groove”.
  • the “circumferential main groove” includes a groove extending in other forms such as a zigzag shape and a wave shape in addition to the groove extending linearly.
  • a groove having a relatively wide width that mainly extends in the tire circumferential direction and does not continue over the entire circumference in the tire circumferential direction and mainly serves as drainage is referred to as an “inclined main groove”.
  • the “edge” means an intersection between the top surface of the block (grounding element) and the side wall partitioned by the groove (that is, each side edge of the top surface of the block (grounding element)).
  • the top surface of the block (grounding element) is defined by an edge, and a part thereof is a grounding surface.
  • the “cut” is also called a sipe, and means a thin cut formed from the surface of the tread toward the inside in the radial direction by a thin blade having a shape like a knife blade, for example.
  • the width of the “cut” on the tread surface is narrower than the groove, for example, 1.0 mm or less.
  • the “cut” may be partially blocked when the surface of the tread is in contact with the road surface as a ground contact surface.
  • the “width of the chamfered portion” provided at the “edge portion” of the “cut” means the length of the “chamfered portion” measured in the circumferential direction in a direction orthogonal to the direction in which the “cut” extends.
  • central region refers to a central region when the tire tread surface is divided into three equal parts in the tire axial direction, that is, a central region including the equator line of the tire tread surface.
  • a tread for a tire having a contact surface that comes into contact with a road surface when the tire rolls, A plurality of inclined main grooves that open to the ground surface and extend at least partially inclined with respect to the tire circumferential direction;
  • a grounding element that is at least partially defined by a portion extending in an inclined manner with respect to the tire circumferential direction of two inclined main grooves disposed adjacent to each other in the tire circumferential direction;
  • At least one notch formed in the grounding element so as to extend in a direction opposite to the inclined main groove with respect to the tire circumferential direction and open to a grounding surface of the grounding element and two inclined main grooves adjacent to the circumferential direction;
  • the at least one notch forms a first edge portion and a second edge portion closer to the tire equator surface than the first edge portion at the boundary with the ground contact surface of the ground contact element when the tire is new,
  • the chamfered portion having a maximum width lc of 1.0 mm to 2.8 mm and a maximum depth
  • the first edge portion formed by a slit extending in a direction opposite to the inclined main groove, A chamfer is provided.
  • a space portion having a substantially wedge-shaped cross section is formed in the vicinity of the ground contact surface. This space portion functions as an additional space for efficiently removing the water film on the ground contact surface, and improves drainage performance.
  • the width of the cut gradually increases in the vicinity of the ground plane due to the substantially wedge-shaped space in the vicinity of the ground plane.
  • the maximum value of the width lc of the chamfered portion is 1.0 mm or more and 2.8 mm or less, it is possible to achieve both the removal of the water film by the chamfered portion and the prevention of bubble generation.
  • the maximum value of the width lc of the chamfered portion is smaller than 1.0 mm, the volume of the space formed by the chamfered portion is reduced, and there is a possibility that the drainage performance cannot be sufficiently improved.
  • the maximum value of the chamfered portion width lc is larger than 2.8 mm, the width at the upper end of the notch becomes too wide, and the water flow in the notch interferes with the water flowing through the inclined main groove and generates bubbles. The drainage performance may be reduced. For this reason, the said range is preferable.
  • the maximum value of the width lc of the chamfered portion is more preferably 2.5 mm or less, and even more preferably 2.0 mm or less.
  • the maximum value dc of the chamfered portion is set to 1.0 mm or more and 2.8 mm or less, it is possible to achieve both removal of the water film by the chamfered portion and prevention of bubble generation.
  • the space formed by the chamfer is small in volume and functions sufficiently as an additional space for removing the water film on the ground surface of the ground element.
  • the drainage performance may not be sufficiently improved. If the maximum value of the chamfer depth dc is larger than 2.8 mm, the volume of the additional space formed by the chamfer becomes too large, and the water flow in the notch interferes with the water flowing in the inclined main groove. As a result, bubbles may be generated and drainage performance may be reduced.
  • the maximum value of the depth dc of the chamfered portion is more preferably 2.5 mm or less, and even more preferably 2.0 mm or less.
  • the notch width w is preferably 1.0 mm or less. In the present invention configured as described above, it is more effective that the flow of water in the notch interferes with the water flowing through the inclined main groove and the bubbles are generated by optimally suppressing the space capacity of the notch. As a result, drainage performance can be improved more effectively.
  • the width w of the cut is larger than 1.0 mm, the width of the cut becomes wider like a groove, and the water flow in such a notch causes interference with the water flowing through the inclined main groove, generating bubbles. This is because the drainage performance may be reduced.
  • the width w of the cut is preferably 0.2 mm or more.
  • the tread is preferably provided with at least one circumferential main groove in the central region CR of the tread, and the chamfered portion of the first edge portion is preferably provided in the grounding element outside the central region CR. .
  • the water in the central region CR which is most difficult to drain, is effectively drained by the circumferential main groove extending in the tire rotation direction, and the grounding surface of the grounding element outside the central region CR
  • the water film is more efficiently removed by the additional space formed by the chamfered portion while being drained by the inclined main groove.
  • a tire tread capable of exhibiting a higher level of drainage performance while preventing uneven wear while using an inclined main groove, and a tire having the tread are provided. .
  • 205 / 55R16 is an example of a tire size of a tire to which the tread 1 of the present embodiment is applied.
  • FIG. 1 is a diagram schematically showing a part of the surface of the tire tread according to the first embodiment of the present invention
  • FIG. 2 is an enlarged sectional view in the tire radial direction along the line II-II in FIG. is there.
  • the vertical direction along line X-X ′ is the tire circumferential direction (rotation direction)
  • the horizontal direction along line Y-Y ′ is the tire axial direction.
  • the tread 1 has a contact surface 2 that comes into contact with the road surface when the tire rolls. And the center part when the ground-contact surface 2 is divided into three equally to a tire axial direction is made into center area
  • a plurality of inclined main grooves 3 that open to the ground contact surface 2 are formed in both side regions located outside the central region CR in the tire axial direction.
  • the inclined main grooves 3 are arranged at equal intervals in the same orientation on each side of the tread 1.
  • the grounding element (block) 5 is defined between the inclined main grooves 3 adjacent in the circumferential direction in each of the both side regions.
  • Each inclined main groove 3 is connected to an inclined portion 3a extending obliquely outward in the tire axial direction with respect to the tire circumferential direction indicated by line XX ′, and an outer end in the tire axial direction of the inclined portion 3a. And an orthogonal portion 3b extending in the tire axial direction.
  • the inclined portion 3a and the orthogonal portion 3b have substantially the same width and depth.
  • the inclined main grooves 3 are arranged at equal intervals with the same orientation in each of the two side regions of the tread 1, so that the inclined main grooves 3 adjacent in the circumferential direction are As shown in FIG. 1, the inclined portions 3a are arranged substantially in parallel with each other, and a part of the grounding element 5 is defined between them. As a result, the portion of the ground contact element 5 sandwiched between the inclined portions 3a adjacent to each other in the circumferential direction is provided with two sides that are inclined with respect to the tire circumferential direction.
  • two circumferential main grooves 7 that extend continuously over the entire circumference in the tire circumferential direction are formed in the central region CR in parallel.
  • the circumferential main groove 7 opens to the ground contact surface and has a certain width.
  • An end portion on the inner side in the tire axial direction of the ground contact element 5 is defined by the circumferential main groove 7 and extends continuously in the tire circumferential direction in the vicinity of the circumferential main groove 7.
  • a plurality of cuts (sipes) 4 are formed from the surface side of the grounding surface 2 of the grounding element 5 in the portion of the grounding element 5 sandwiched between the inclined portions 3 a adjacent in the circumferential direction.
  • each notch 4 crosses the portion of the grounding element 5 sandwiched between the inclined portions 3a adjacent in the tire circumferential direction in a direction perpendicular to the inclined portion 3a.
  • each of the cuts 4 extends in a direction opposite to the inclined main groove 3 with respect to the tire circumferential direction, and is formed in each of the grounding surface 2 of the grounding element 5 and the two inclined main grooves 3 adjacent in the tire circumferential direction. Open (communication).
  • the notch 4 forms a first edge portion 51 and a second edge portion 52 disposed on the tire equatorial plane side from the first edge portion 51 at the boundary with the ground contact surface 2 when the tire is new. Yes.
  • the chamfered portion 6 is provided on the first edge portion 51.
  • the notch 4 has a constant width w below the chamfered portion 6 as shown in FIG.
  • the width w is preferably 1.0 mm or less.
  • the width w is more preferably 0.2 mm or more.
  • the notches 4 are formed at two locations in each of the portions of the grounding element 5 sandwiched between the inclined portions 3a adjacent in the tire circumferential direction, and the width w is 0.8 mm.
  • the chamfered portion 6 formed in the first edge portion 51 has a width lc and a depth dc.
  • the “width lc” of the chamfered portion means the width lc of the “chamfered portion 6” measured along the tire outer peripheral direction in a direction orthogonal to the direction in which the “cut 4” extends (see FIG. 2).
  • the width lc of the chamfered portion 6 is preferably 1.0 mm or more and 2.8 mm or less, more preferably 2.5 mm or less, and further preferably 2.0 mm or less. In the present embodiment, the width lc is set to 1.5 mm. In the configuration of the present embodiment, the depth dc of the chamfered portion 6 is preferably 1.0 mm or more and 2.8 mm or less, more preferably 2.5 mm or less, and further preferably 2.0 mm or less. In the present embodiment, the depth dc is set to 1.5 mm.
  • the chamfered portion 6 is configured such that the width lc and the depth dc are constant along the notch 4.
  • the width c and the depth dc of the chamfered portion 6 may be different depending on the position of the edge portion in the length direction.
  • a configuration in which the width lc and / or the depth dc of the chamfered portion 6 gradually changes along the length direction of the cut 4 may be adopted.
  • the maximum values of the width lc and the depth dc of the chamfered portion 6 are preferably within the above ranges.
  • the width of the chamfered portion 6 increases or decreases linearly from one end to the other end in the longitudinal direction of the chamfered portion 6.
  • a configuration in which the width continuously increases or decreases in a curved shape, and a configuration in which the width of the chamfered portion 6 increases or decreases in a staircase shape may be employed.
  • the depth of the chamfer 6 continuously increases or decreases linearly from one longitudinal end to the other end of the chamfer 6, and the depth of the chamfer 6 continues in a curved line.
  • a configuration in which the chamfered portion 6 increases or decreases, or a configuration in which the depth of the chamfered portion 6 continuously increases or decreases in a step shape may be used.
  • the chamfered portion 6 does not exist over the entire area of the first edge portion 51 as long as it is within a range in which the above-described operational effects can be exhibited, that is, only a part of the first edge portion 51 is chamfered.
  • the configuration may be such that the portion 6 is formed.
  • the chamfered portion is not formed on the second edge portion 52 disposed on the side close to the tire equator plane. That is, in the tread 1 of the present embodiment, the chamfered portion 6 is formed only on the first edge portion 51.
  • the tread 1 having such a configuration may be manufactured as a tread for a separate tire retread in addition to being attached to the tire or formed on the tire surface in the tire manufacturing process.
  • the chamfered portion 6 provided in the first edge portion 51 has a function of forming an additional storage area having a wedge-shaped cross section for removing water from the grounding surface 2 of the grounding element 5 and flows through the inclined main groove 3.
  • the water flow is prevented from colliding violently with the first edge portion 51. Thereby, it is possible to suppress the generation of bubbles due to the interference of the water flow in the vicinity of the notch 4, and as a result, the drainage performance can be improved.
  • variety of the opening end of the notch 4 becomes too wide, and bubble generation
  • FIG. 3 is a view schematically showing a part of the surface of the tire tread according to the second embodiment of the present invention
  • FIG. 4 is an enlarged perspective view of the portion indicated by IV in FIG. Similar to FIG. 1, in FIG. 3, the vertical direction along line XX ′ is the tire circumferential direction (rotation direction), and the horizontal direction along line YY ′ is the tire axial direction.
  • the configuration different from the first embodiment described above will be mainly described, and the description of the same configuration will be omitted.
  • the tread 21 of the second embodiment includes a grounding surface 22 and a plurality of inclined main grooves 23 in the same manner as the tread 1 of the first embodiment described above.
  • the inclined main groove 23 of the present embodiment is curved in an arc shape as a whole and extends inclined with respect to the tire circumferential direction.
  • the plurality of grounding elements 25 are at least partially defined by such inclined main grooves 23.
  • the tread 21 is formed with a notch 4 extending across the grounding element 25 as in the tread 1 of the first embodiment described above.
  • the notches 4 open to the surface of the grounding element 25 (the grounding surface 22) and two inclined main grooves 23 adjacent to each other in the circumferential direction, and extend while inclining in the opposite direction to the inclined main groove 23 with respect to the tire circumferential direction. ing.
  • the notch 24 includes a first edge portion 251 and a second edge portion 252 closer to the tire equatorial plane than the first edge portion 251 between the surface of the grounding element 25.
  • the width w of the cut 24 is more preferably 1.0 mm or less and 0.2 mm or more.
  • the notches 24 are formed at two locations between two inclined main grooves 23 adjacent in the circumferential direction, and the width w of the notches 24 is 1.0 mm.
  • the inclined main groove 23 arranged on one side in the tire axial direction has the inclined main groove 23 arranged on the opposite side in the tire axial direction and the inner ends formed in the central region CR of the tread 21.
  • the sub-grooves 8 are connected.
  • the notches 24 arranged in both side end regions located on the outer side in the tire axial direction of the central region CR are only the first edge portion 251 that is the edge portion far from the tire equatorial plane.
  • a chamfered portion 26 is provided. Therefore, the first edge portion 251 and the second edge portion 252 of the notch 24 disposed in the central region CR and the second edge portion 252 of the notch 24 disposed in the both end regions include a chamfered portion. 6 is not provided.
  • the width lc of the chamfered portion 26 is preferably 1.0 mm or more and 2.8 mm or less, more preferably 2.5 mm or less, and further preferably 2.0 mm or less. In the present embodiment, the width lc of the chamfered portion 26 is set to 2.0 mm.
  • the depth dc of the chamfered portion 26 is preferably 1.0 mm or more and 2.8 mm or less, more preferably 2.5 mm or less, and further preferably 2.0 mm or less. . In the present embodiment, the depth dc of the chamfered portion 26 is set to 1.0 mm.
  • the width lc and the depth dc of the chamfered portion 26 are constant along the notch 24.
  • the width c and the depth dc of the chamfered portion 26 may be different depending on the position of the edge portion in the length direction. Even in such a case, the maximum values of the width lc and the depth dc of the chamfered portion 26 are preferably within the above ranges.
  • the tread 21 of the second embodiment has a configuration in which the entire configuration of the tread pattern is so-called point-symmetric. However, also in the tread 21 having such a configuration, drainage from the central region CR to the outside direction is mainly performed by the inclined main groove 23.
  • the chamfered portion 26 provided in the first edge portion 251 forms an additional storage area for removing water on the grounding surface 22 of the grounding element 25, and the water flow that has flowed through the inclined main groove 23 is formed.
  • the water flow is prevented from violently colliding with the first edge portion 251. Thereby, it becomes possible to suppress generation
  • FIG. 5 schematically illustrates a part of the surface of the tire tread according to the third embodiment of the present invention.
  • FIG. 6 is an enlarged perspective view of the portion indicated by VI in FIG. 5
  • FIG. 7 is an enlarged perspective view of a modification of the portion indicated by VI in FIG. .
  • the vertical direction along line XX ′ is the tire circumferential direction (rotation direction)
  • the horizontal direction along line YY ′ is the tire axial direction.
  • the tread 31 of the third embodiment includes a grounding surface 32 and a plurality of inclined main grooves 33 as in the first and second embodiments described above.
  • the inclined main groove 33 of the present embodiment is curved in an arc shape as a whole from the both side edges of the tread 31 and extends while inclining with respect to the tire circumferential direction.
  • the plurality of grounding elements 25 are at least partially defined by the inclined main grooves 33.
  • a single circumferential main groove 37 that continuously extends over the entire circumference in the tire circumferential direction is formed.
  • the grounding element 35 is also partitioned by the circumferential main groove 37 and has a portion that extends continuously in the tire circumferential direction in the vicinity of the circumferential main groove 37.
  • the tread 31 is formed with a notch 34 extending across the grounding element 35, similarly to the treads of the first and second embodiments described above.
  • the notches 34 open to the surface of the ground contact element 35 (the ground contact surface 32) and two inclined main grooves 33 adjacent to each other in the tire circumferential direction, and are inclined in the opposite direction to the inclined main groove 33 with respect to the tire circumferential direction. It extends.
  • the notches 34 are disposed in the vicinity of the center position in the tire axial direction of the side regions located on both sides of the center region CR.
  • the notch 34 forms a first edge portion 351 and a second edge portion 352 closer to the tire equatorial plane than the first edge portion 351 between the surface of the ground contact element 35.
  • the width w of the notch 34 is preferably 1.0 mm or less and 0.2 mm or more. In the tread 31 of the present embodiment, the width w of the notch 34 is 0.6 mm.
  • the chamfered portion 36 is formed on the first edge portion 351. Note that a chamfered portion is not formed on the second edge portion 352.
  • the chamfered portion 36 of the present embodiment as shown in FIG.
  • the width lc and the depth dc are continuously changing.
  • the width lc and the depth dc of the chamfered portion 36 are zero, that is, the chamfered portion 36 is not formed, and the other inclined main groove 36 is not formed.
  • the width lc and the depth dc of the chamfered portion 36 continuously increase linearly (in a straight line) toward the opening (back side in FIG. 6) of the cut 34 into the groove 33, and the cut into the other inclined main groove 33.
  • the width lc and the depth dc of the chamfered portion 36 are maximum at the opening 34.
  • the maximum width lc of the chamfered portion 36 is preferably 1.0 mm or more and 2.8 mm or less, more preferably 2.5 mm or less, and further preferably 2.0 mm or less.
  • the maximum depth dc of the chamfered portion 36 is preferably 1.0 mm or more and 2.8 mm or less, more preferably 2.5 mm or less, and further preferably 2.0 mm or less.
  • the chamfered portion 36 has a maximum width lc of 2.0 mm and a maximum depth dc of 1.0 mm.
  • the opening of the notch 44 (on the front side of FIG. 7) into one inclined main groove 43 that defines the grounding element 45 is the first.
  • the width lc and the depth dc of the chamfered portion 46 formed in the edge portion 451 is maximized, and the width lc of the chamfered portion 46 toward the opening (the back side in FIG. 7) of the cut 44 into the other inclined main groove 43.
  • the width lc and the depth dc of the chamfered portion 46 may be zero at the opening (the back side in FIG. 7) of the cut 44 into the other inclined main groove 43 as the depth dc decreases (FIG. 7). reference).
  • the second edge portion 452 has no chamfered portion.
  • the width and depth of the chamfered portion 36 provided on the first edge portion 351 of the cut 34 are configured to continuously change in the length direction of the cut 34.
  • the shape of the grounding element 35 can be changed while maintaining the effect of improving the drainage performance by the chamfered portion 36. Thereby, the drainage performance by the chamfer 36 can be improved more efficiently. Furthermore, with such a configuration, it becomes possible to add aesthetics to the chamfered portion 36.
  • the configuration in which the width of the chamfered portion gradually changes along the longitudinal direction of the chamfered portion (the direction in which the edge extends) shown in FIGS. 6 and 7 is the same as that of the first or second embodiment. It may be used for the tread. Furthermore, the structure which has a different value in the position where the width
  • Example 1 of the present invention test results using a tire provided with the tire tread of Example 1 of the present invention will be described.
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire comparative example
  • a tire tread having no chamfered portion and a tire (comparative example 1) provided with a tire tread having a chamfered portion only at the second edge portion in the vicinity of the cut.
  • a tire having a tire tread having chamfered portions on both edge portions (both the first edge portion and the second edge portion) on both sides in the vicinity of the cut, and the first edge portion in the vicinity of the cut
  • a tire having a tread for a tire having a relatively large chamfered portion (Comparative Example 3) and a tire having a tread for a tire having a chamfered portion having a width lc equal to that of Comparative Example 3 but having a large depth dc (Comparative Example) 4) and were used.
  • Example 1 As test tires according to Example 1, Conventional Example and Comparative Examples 1 to 4, unused 205 / 55R16 tires were used and mounted on 6.5 J ⁇ 16 wheels, and the internal pressure was set to 220 kPa.
  • Test method A front-wheel drive vehicle with a displacement of 2000 cc with the above test tires mounted on four wheels was run at a speed of 60 km / h in a road pool containing a colored liquid with a water depth of 8 mm with one driver on board.

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Abstract

　La présente invention a pour but de fournir une bande de roulement de pneu avec laquelle il est possible d'obtenir un niveau élevé d'efficacité d'évacuation d'eau tout en empêchant une usure irrégulière lors de l'utilisation de rainures principales inclinées, et un pneu ayant ladite bande de roulement. Pour atteindre ce but, la présente invention porte sur une bande de roulement (1) pour un pneu qui possède une surface de contact avec le sol (2) pour venir en contact avec la surface routière lors du roulement, la bande de roulement étant pourvue : d'une pluralité de rainures principales inclinées (3), qui s'ouvrent sur la surface de contact avec le sol (2), au moins une partie de celles-ci s'étendant en s'inclinant par rapport à la direction de la périphérie du pneu; d'un élément de contact avec le sol (5), au moins une partie de celui-ci étant segmentée par des parties de deux des rainures principales inclinées (3), disposées de façon adjacente dans la direction de la périphérie du pneu, les parties s'étendant selon une inclinaison par rapport à la direction de la périphérie du pneu; au moins une encoche (4) formée dans l'élément de contact avec le sol (5) de façon à s'étendre en s'inclinant dans la direction opposée aux rainures principales inclinées (3) par rapport à la direction de la périphérie du pneu, l'encoche s'ouvrant sur la surface de contact avec le sol (2) de l'élément de contact avec le sol (5) et sur deux rainures principales inclinées (3) qui sont adjacentes dans la direction périphérique; au moins une encoche (4) formant une première section de bord (51) et une seconde section de bord (52), plus proche de la surface équatoriale du pneu que la première section de bord (51), au bord de la surface de contact avec le sol (2) de l'élément de contact avec le sol (5) quand le pneu est neuf, et une section chanfreinée (6) disposée uniquement sur la première section de bord (51), la largeur maximale de la largeur lc étant de 1,0 à 2,8 mm et la valeur maximale de la profondeur dc étant de 1,0 à 2,8 mm.
PCT/JP2015/068833 2014-06-30 2015-06-30 Bande de roulement de pneu et pneu ayant ladite bande de roulement Ceased WO2016002781A1 (fr)

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CN109641489A (zh) * 2016-08-31 2019-04-16 横滨橡胶株式会社 充气轮胎

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JPH08142608A (ja) * 1994-11-17 1996-06-04 Bridgestone Corp 空気入りラジアルタイヤ
JPH10236110A (ja) * 1997-02-26 1998-09-08 Bridgestone Corp 空気入りタイヤ及びその空気入りタイヤの装着方法
JP2000142034A (ja) * 1998-11-09 2000-05-23 Bridgestone Corp 排水性能に優れた乗用車用空気入りタイヤ
JP2001026205A (ja) * 1999-07-13 2001-01-30 Bridgestone Corp 空気入りタイヤ
WO2009020077A1 (fr) * 2007-08-07 2009-02-12 Sumitomo Rubber Industries, Ltd. Pneus
US20110297284A1 (en) * 2008-12-10 2011-12-08 Stefano Montesello Pneumatic tyre

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Publication number Priority date Publication date Assignee Title
JPH08142608A (ja) * 1994-11-17 1996-06-04 Bridgestone Corp 空気入りラジアルタイヤ
JPH10236110A (ja) * 1997-02-26 1998-09-08 Bridgestone Corp 空気入りタイヤ及びその空気入りタイヤの装着方法
JP2000142034A (ja) * 1998-11-09 2000-05-23 Bridgestone Corp 排水性能に優れた乗用車用空気入りタイヤ
JP2001026205A (ja) * 1999-07-13 2001-01-30 Bridgestone Corp 空気入りタイヤ
WO2009020077A1 (fr) * 2007-08-07 2009-02-12 Sumitomo Rubber Industries, Ltd. Pneus
US20110297284A1 (en) * 2008-12-10 2011-12-08 Stefano Montesello Pneumatic tyre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109641489A (zh) * 2016-08-31 2019-04-16 横滨橡胶株式会社 充气轮胎

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