WO2014038378A1 - 空気入りタイヤ - Google Patents

空気入りタイヤ Download PDF

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Publication number
WO2014038378A1
WO2014038378A1 PCT/JP2013/072334 JP2013072334W WO2014038378A1 WO 2014038378 A1 WO2014038378 A1 WO 2014038378A1 JP 2013072334 W JP2013072334 W JP 2013072334W WO 2014038378 A1 WO2014038378 A1 WO 2014038378A1
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WO
WIPO (PCT)
Prior art keywords
groove
tire
circumferential
width direction
rib
Prior art date
Application number
PCT/JP2013/072334
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
勝智 永吉
Original Assignee
横浜ゴム株式会社
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 横浜ゴム株式会社 filed Critical 横浜ゴム株式会社
Priority to CN201380029239.5A priority Critical patent/CN104379370B/zh
Publication of WO2014038378A1 publication Critical patent/WO2014038378A1/ja

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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
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • 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
    • B60C11/0304—Asymmetric 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
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C11/125—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern arranged at 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
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0346—Circumferential grooves with zigzag shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0348—Narrow grooves, i.e. having a width of less than 4 mm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0355—Circumferential grooves characterised by depth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
    • B60C2011/0369—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth with varying depth of the groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0386—Continuous ribs
    • B60C2011/039—Continuous ribs provided at the shoulder portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—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

Definitions

  • the present invention relates to a pneumatic tire requiring uneven wear resistance and WET performance.
  • pneumatic tires for light trucks stipulated by JATMA are mainly used for local driving, stop-and-go is repeated many times during medium and low speed driving, and excellent wear resistance and grip power (WET performance) are required.
  • WET performance wear resistance and grip power
  • a pneumatic tire described in Patent Document 1 is located in a tread portion at one central circumferential groove located on the tire equatorial plane, and between the central circumferential groove and both tread ends.
  • a total of three lateral circumferential grooves are arranged. These circumferential grooves form four rows of ribs.
  • the rib between the central circumferential groove and the lateral circumferential groove includes a plurality of lateral grooves extending in a direction intersecting the tire circumferential direction from the central circumferential groove, and a first narrow groove extending in the tire circumferential direction communicating with the lateral groove.
  • the pneumatic tire described in Patent Document 2 has one end opened in the lateral circumferential groove and the other end communicated with the second narrow groove portion with respect to the pneumatic tire described in Patent Document 2 described above.
  • An inclined sipe that continues to the first lateral sipe and extends in a direction inclined with respect to the tire equatorial plane is further provided.
  • a rib-shaped land portion is defined between three circumferential main grooves disposed in the tread portion, and one rib-shaped land portion is provided on the rib-shaped land portion.
  • a block land portion is defined by arranging a circumferential sub groove, a width direction groove communicating with the circumferential main groove and the circumferential sub groove.
  • the pneumatic tires described in Patent Documents 1 to 3 described above are provided with circumferential sub-grooves (first narrow groove section and second narrow groove section) in the rib-like land section (ribs), and the circumferential sub-grooves ( A width direction groove (lateral groove) that communicates the first narrow groove portion and the second narrow groove portion) with the central circumferential main groove (central circumferential groove) is provided, and the central circumferential groove (central circumferential groove) Block land portions are defined on both sides in the tire width direction.
  • the block land portions are partitioned on both sides in the tire width direction of the central circumferential groove (central circumferential groove), so that the rigidity of the portion is increased. Therefore, when used mainly in local travel, early wear (center wear wear) tends to occur in the center region of the tread due to repeated stop-and-go during medium and low speed travel. That is, it is difficult to meet the demand for wear resistance.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a pneumatic tire capable of improving uneven wear resistance and WET performance.
  • the pneumatic tire of the first invention has a symmetrical tread pattern on the tread surface of the tread portion that is symmetrical on both sides in the tire width direction with respect to the tire equatorial plane.
  • the circumferential main When the groove is on the tire equator plane, the circumferential main groove on the tire equator plane is a center main groove, and when the circumferential main groove is not on the tire equator plane, the tire width direction of the tire equator plane is When the circumferential main grooves on both outer sides are combined into a center main groove, and the rib-like land portions adjacent to both outer sides in the tire width direction of the center main groove are side rib-like land portions, One side of tire width direction The lateral rib-shaped land portion extends in the tire circumferential direction within a range of 40% to 60% of the tire width direction dimension, and has a groove depth shallower than the circumferential main groove.
  • the formed circumferential narrow groove and one end provided in the lateral rib-shaped land portion and terminating in the circumferential main groove adjacent to the outer side in the tire width direction of the lateral rib-shaped land portion, and the other end Is formed to have a groove depth shallower than the circumferential main groove, and is arranged in the tire circumferential direction.
  • the side rib-shaped land portion of the side rib-shaped land portion with the circumferential narrow groove as a boundary is formed into a rib shape, and the side rib-shaped land portion tire with the circumferential narrow groove as a boundary
  • the outside in the width direction has a block shape.
  • the circumferential narrow groove has drainage performance in the tire circumferential direction and the lateral narrow groove has drainage performance to the outside in the tire width direction, so that WET performance (operability on wet road surface) And braking performance).
  • the rib shape can suppress a decrease in rigidity more than necessary and improve uneven wear resistance.
  • the occurrence of early wear (center wear wear) in the center region of the tread portion is suppressed by repetition of stop-and-go during medium-low speed traveling.
  • the side rib shape is provided. Since the difference in rigidity in the tire width direction of the land portion is reduced, uneven wear can be suppressed. As a result, it is possible to improve uneven wear resistance and WET performance. Moreover, according to this pneumatic tire, since it has a symmetrical tread pattern, it is possible to replace the front, rear, left and right in rotation, so that the wear can be made uniform and the life can be extended.
  • the pneumatic tire according to a second aspect is the pneumatic tire according to the first aspect, wherein the circumferential narrow groove and the width narrow groove have a maximum groove depth relative to a groove depth of the circumferential main groove. It is characterized by being in the range of 10 [%] or more and 40 [%] or less.
  • the maximum groove depth of the circumferential narrow groove and the width narrow groove is 10% or more with respect to the groove depth of the circumferential main groove, the drainage performance is further exhibited.
  • the effect of improving the WET performance can be remarkably obtained.
  • the maximum groove depth of the circumferential narrow groove and the width narrow groove is 40% or less with respect to the groove depth of the circumferential main groove, the rigidity reduction of the lateral rib-shaped land portion is further suppressed.
  • the effect of improving uneven wear resistance can be obtained remarkably.
  • the effect of improving uneven wear resistance and the effect of improving WET performance can be obtained remarkably.
  • the pneumatic tire of the third invention is characterized in that, in the first or second invention, a groove bottom sipe is formed at the groove bottom of either the circumferential narrow groove or the width narrow groove. To do.
  • the circumferential narrow groove and the lateral narrow groove are formed with a shallower groove depth than the circumferential main groove, the difference in the groove depth is compensated by the groove bottom sipes.
  • the pneumatic tire according to a fourth aspect of the present invention is the pneumatic tire according to the third aspect, wherein a groove bottom sipe formed at the groove bottom of the widthwise narrow groove communicates with the circumferential main groove. It extends in the range of 40 [%] or more and 60 [%] or less of the distance from the groove to the circumferential narrow groove.
  • the drainage from the narrow groove in the width direction to the main groove in the circumferential direction can be improved by connecting the groove bottom sipe to the circumferential main groove.
  • the groove bottom sipe 40% or more of the distance from the circumferential main groove to the circumferential narrow groove
  • the drainage improvement effect can be remarkably obtained, and it should be 60% or less.
  • the effect of keeping the block-shaped rigidity of the side rib-like land portion uniform in the tire width direction and the tire circumferential direction can be remarkably obtained.
  • the effect of improving uneven wear resistance and the effect of improving WET performance can be obtained remarkably.
  • the pneumatic tire of the fifth invention is the pneumatic tire according to the third invention, wherein the groove bottom sipe formed on the groove bottom of the circumferential narrow groove is a portion where the width narrow groove communicates with the circumferential narrow groove. It is characterized by being arranged in the range of 60 [%] to 90 [%] of the interval.
  • the drainage improvement effect can be remarkably obtained by setting the groove bottom sipe to 60% or more of the interval between the portions where the width direction narrow grooves communicate with the circumferential direction narrow grooves. , 90% or less, the effect of keeping the rigidity of the rib shape and block shape of the side rib-shaped land portion uniform in the tire width direction and the tire circumferential direction can be significantly obtained. As a result, the effect of improving uneven wear resistance and the effect of improving WET performance can be obtained remarkably.
  • the pneumatic tire according to a sixth aspect of the present invention is the pneumatic tire according to any one of the third to fifth aspects, wherein the groove bottom sipe has a maximum groove depth from the tread surface and a groove depth of the circumferential main groove. It is characterized by being in the range of 60 [%] or more and 90 [%] or less.
  • the drainage improvement effect can be remarkably obtained, and 90 [% ]
  • the effect of maintaining the rigidity of the rib shape and block shape of the side rib-shaped land portion uniformly in the tire width direction and the tire circumferential direction can be remarkably obtained.
  • the effect of improving uneven wear resistance and the effect of improving WET performance can be obtained remarkably.
  • the pneumatic tire according to a seventh aspect of the present invention is the pneumatic tire according to any one of the first to sixth aspects, wherein the circumferential main groove and the circumferential narrow groove forming the center main groove are the same distance in the tire width direction. It is characterized by being bent or curved in the tire width direction while maintaining the above.
  • the circumferential main groove forming the center main groove is formed by bending or bending, so that it has edge components in both the tire width direction and the tire circumferential direction, and has a WET performance. Can be improved.
  • the circumferential narrow groove and the circumferential main groove maintain the same distance in the tire width direction, the rib shape of the side rib-shaped land portion and the tire width direction dimension of the block shape are uniform in the tire circumferential direction. The effect of maintaining the rigidity of the rib shape and block shape of the side rib-shaped land portion in the tire width direction and the tire circumferential direction can be remarkably obtained.
  • the pneumatic tire according to an eighth aspect of the present invention is the pneumatic tire according to any one of the first to seventh aspects, wherein the center main groove has a groove width of 3 [mm] in the tire width direction from the tire equatorial plane to the ground contact edge. %] And 15 [%] or less, and each circumferential main groove provided between the center main groove and the lateral rib-shaped land portion is located at the tire equatorial plane. It is characterized by being in the range of 50 [%] or more and 60 [%] or less of the dimension in the tire width direction from the ground to the ground contact end.
  • the groove width of the center main groove disposed on the center side in the tire width direction is defined, and the position of the circumferential main groove adjacent to the outer side of the center main groove in the tire width direction is the tire width.
  • the JIS hardness at 20 [° C.] of the compound constituting the tread portion is in the range of 60 to 75. It is characterized by.
  • the pneumatic tire of the tenth invention is characterized in that, in any one of the first to ninth inventions, the pneumatic tire is applied to a pneumatic tire for a small truck having a specified internal pressure of 600 [kPa] or less.
  • this pneumatic tire is mainly used for local travel, stop and go is frequently repeated at medium to low speed travel, and excellent wear resistance and grip power (WET performance) are required. According to this pneumatic tire, it is possible to satisfy the requirements for excellent wear resistance and gripping power as a pneumatic tire for small trucks mainly used in local travel.
  • the pneumatic tire according to the present invention can improve uneven wear resistance and WET performance.
  • FIG. 1 is a plan view of a pneumatic tire according to an embodiment of the present invention.
  • FIG. 2 is a plan view of another example of the pneumatic tire according to the embodiment of the present invention.
  • FIG. 3 is a partially enlarged cross-sectional view of the pneumatic tire shown in FIGS. 1 and 2.
  • FIG. 4 is a partially enlarged plan view of the pneumatic tire shown in FIGS. 1 and 2.
  • FIG. 5 is a plan view of another example of the pneumatic tire according to the embodiment of the present invention.
  • FIG. 6 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
  • FIG. 7 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
  • FIG. 8 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
  • FIG. 9 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
  • FIG. 1 and 2 are plan views of the pneumatic tire according to the present embodiment
  • FIG. 3 is a partially enlarged sectional view of the pneumatic tire shown in FIGS. 1 and 2
  • FIG. 5 is a partially enlarged plan view of the pneumatic tire shown in FIG. 2
  • FIG. 5 is a plan view of another example of the pneumatic tire according to the present embodiment.
  • the tire radial direction refers to a direction orthogonal to the rotation axis (not shown) of the pneumatic tire 1
  • the tire radial direction inner side refers to the side toward the rotation axis in the tire radial direction, the tire radial direction outer side.
  • the tire width direction means a direction parallel to the rotation axis
  • the inner side in the tire width direction means the side toward the tire equator plane (tire equator line) CL in the tire width direction
  • the outer side in the tire width direction means the tire width.
  • the tire circumferential direction is a circumferential direction with the rotation axis as a central axis.
  • the tire equatorial plane CL is a plane that is orthogonal to the rotational axis of the pneumatic tire 1 and passes through the center of the tire width of the pneumatic tire 1.
  • the tire equator line is a line along the circumferential direction of the pneumatic tire 1 on the tire equator plane CL. In the present embodiment, the same sign “CL” as that of the tire equator plane is attached to the tire equator line.
  • the pneumatic tire 1 of the present embodiment has a tread portion 2 as shown in FIGS. 1 and 2.
  • the tread portion 2 is made of a rubber material, exposed at the outermost side in the tire radial direction of the pneumatic tire 1, and the surface thereof becomes the contour of the pneumatic tire 1 as a tread surface 2 a.
  • the pneumatic tire 1 of the present embodiment has a symmetric tread pattern in which the both sides in the tire width direction are symmetric with respect to the tire equatorial plane CL in the tread portion 2.
  • the tread portion 2 has at least three circumferential main grooves 3 extending in the tire circumferential direction on the tread surface 2a (three in FIG. 1 and three in FIG. 1). (It is four).
  • the tread portion 2 has at least four rib-like land portions 4 extending along the tire circumferential direction by at least three circumferential main grooves 3 on the tread surface 2a (four in FIG. 1). In FIG. 2, there are five).
  • the symmetrical tread pattern indicates that the tread pattern has the same shape when turned over in the tire width direction.
  • the symmetrical tread pattern includes a pattern whose phase is shifted in the tire circumferential direction with respect to the tire equatorial plane CL.
  • the circumferential main groove 3 on the tire equator plane CL is set as the center main groove 31.
  • the two main circumferential grooves 3 on both outer sides of the tire equatorial plane CL in the tire width direction are combined to form the center main groove 31.
  • the rib-like land portions 4 adjacent to both outer sides in the tire width direction of the center main groove 31 are referred to as side rib-like land portions 41.
  • the circumferential main groove 3 is on the tire equator plane CL, so the circumferential main groove 3 on the tire equator plane CL is the center main groove. 31.
  • the rib-shaped land portions 4 adjacent to the outer sides in the tire width direction of the center main grooves 31 are referred to as side rib-shaped land portions 41.
  • the lateral rib-shaped land portion 41 is formed with a circumferential narrow groove 5 and a narrow width groove 6 having a narrower groove width than the circumferential main groove 3.
  • the circumferential narrow groove 5 ranges from one side in the tire width direction to 40 [%] or more and 60 [%] or less of the tire width direction dimension W of the side rib-shaped land portion 41. Thus, it extends along the tire circumferential direction.
  • the circumferential narrow groove 5 is formed with a groove depth D2 (see FIG. 3) shallower than the groove depth D1 (see FIG. 3) of the circumferential main groove 3.
  • one end of the width-direction narrow groove 6 communicates with the circumferential main groove 3 adjacent to the outer side in the tire width direction of the lateral rib-shaped land portion 41 and ends at the other end.
  • a plurality of circumferentially extending grooves 5 are provided that extend in a crossing manner in the tire circumferential direction and communicate with the circumferential narrow groove 5.
  • the width direction narrow groove 6 is formed with a groove depth D3 (see FIG. 3) shallower than the groove depth D1 (see FIG. 3) of the circumferential main groove 3.
  • the circumferential main groove 3 has a groove depth D1 in a range of 7 [mm] to 12 [mm] and a groove width of 8.0 [mm] or more.
  • the range is 15.0 [mm] or less.
  • the circumferential narrow grooves 5 and the width narrow grooves 6 have the groove depths D2 and D3 within the above specified range, and the groove width within the range of 1.0 [mm] to 5.0 [mm]. .
  • the side rib-shaped land part 41 is formed into a rib shape on the inner side in the tire width direction (center main groove 31 side) with the circumferential narrow groove 5 as a boundary by the circumferential narrow groove 5 and the lateral narrow groove 6.
  • the outer side in the tire width direction with the circumferential narrow groove 5 as a boundary is formed into a block shape by a plurality of narrow grooves 6 in the width direction.
  • the circumferential narrow groove 5 has a drainage property in the tire circumferential direction
  • the width-direction narrow groove 6 has an outer side in the tire width direction.
  • the circumferential narrow groove 5 is provided at substantially the center in the tire width direction, which is in the range of 40% to 60% of the tire width direction dimension W of the lateral rib-shaped land portion 41. Since the difference in rigidity in the tire width direction of the rib-like land portion 41 is reduced, it is possible to suppress uneven wear. As a result, it is possible to improve uneven wear resistance and WET performance. Moreover, according to this pneumatic tire 1, since it has a symmetrical tread pattern, it is possible to replace the front, rear, left and right in rotation, so that the wear can be made uniform and the life can be extended. Become.
  • the pneumatic tire 1 of the present embodiment has the maximum groove depths D ⁇ b> 2 and D ⁇ b> 3 of the circumferential narrow grooves 5 and the width narrow grooves 6, and the groove depth D ⁇ b> 1 of the circumferential main grooves 3.
  • the maximum groove depths D ⁇ b> 2 and D ⁇ b> 3 of the circumferential narrow groove 5 and the widthwise narrow groove 6 are 10% or more with respect to the groove depth D ⁇ b> 1 of the circumferential main groove 3.
  • the drainage performance can be further exerted, and the improvement effect of the WET performance can be remarkably obtained.
  • the maximum groove depths D2 and D3 of the circumferential narrow groove 5 and the widthwise narrow groove 6 are 40% or less with respect to the groove depth D1 of the circumferential main groove 3, the lateral rib-shaped land portion is formed.
  • the maximum groove depths D2 and D3 of the circumferential narrow grooves 5 and the widthwise narrow grooves 6 are set to be the groove depths of the circumferential main grooves 3 in order to obtain the effect of improving uneven wear resistance and the WET performance. More preferably, it is in the range of 20% to 30% with respect to the thickness D1.
  • groove bottom sipes 7 and 8 are formed on the groove bottom of either the circumferential narrow groove 5 or the width narrow groove 6. It is preferable.
  • the pneumatic tire 1 of the present embodiment has a tread surface that has one end communicating with the circumferential main groove 3 and the other end terminating in the rib-like land portion 4 and opening in the tread surface 2 a. It has a sipe 9.
  • the sipe 7, 8, 9 has a groove width of 1.0 [mm] or less.
  • the pneumatic tire 1 of the present embodiment has a narrow groove of 10% or more with respect to the groove depth D1 of the circumferential main groove 3 on the tread surface 2a of the rib-like land portion 4 on the outermost side in the tire width direction. Or sipe is not arranged.
  • the groove bottom sipe 7 is formed from the groove bottom of the circumferential narrow groove 5 toward the inner side in the tire radial direction, and extends along the extending direction of the circumferential narrow groove 5 (tire circumferential direction). .
  • the groove bottom sipe 7 is formed along the groove wall of the circumferential narrow groove 5 in FIG. 4.
  • the groove bottom sipe 7 is not limited to this, but may be formed at the center of the groove bottom of the circumferential narrow groove 5.
  • the groove bottom sipe 7 may be formed on one or both of the both groove walls of the circumferential narrow groove 5.
  • the groove bottom sipe 8 is formed from the groove bottom of the width-direction narrow groove 6 toward the inner side in the tire radial direction, and extends along the extending direction of the width-direction narrow groove 6. Moreover, the groove bottom sipe 8 is formed along the groove wall of the width direction narrow groove 6 in FIG. However, the groove bottom sipe 8 is not limited to this, but may be formed at the center of the groove bottom of the width direction narrow groove 6. Further, when the groove bottom sipe 8 is formed along the groove wall of the width direction narrow groove 6, the groove bottom sipe 8 may be formed on either or both of the both groove walls of the width direction narrow groove 6.
  • the circumferential narrow groove 5 and the width narrow groove 6 are formed with a shallower groove depth than the circumferential main groove 3. , 8 to keep the rib-shaped rigidity of the side rib-shaped land portion 41 uniform in the tire width direction, and the block-shaped rigidity of the side rib-shaped land portion 41 to the tire width direction and the tire circumferential direction. It is possible to suppress uneven wear while maintaining the same. As a result, the effect of improving the uneven wear resistance can be remarkably obtained.
  • the groove bottom sipe 8 formed in the groove bottom of the width direction narrow groove 6 is connected to the circumferential main groove 3, and the circumferential direction It is preferable that the distance S1 from the main groove 3 to the circumferential narrow groove 5 extends in the range of 40% to 60%.
  • the groove bottom sipe 8 is not less than 45% of the distance S1 from the circumferential main groove 3 to the circumferential narrow groove 5 and not less than 55%. It is more preferable to extend in the following range.
  • the groove bottom sipe 7 formed on the groove bottom of the circumferential narrow groove 5 has the width narrow groove 6 communicating with the circumferential narrow groove 5. It is preferable to arrange in the range of 60 [%] or more and 90 [%] or less of the interval S2 of the locations to be performed.
  • a plurality of groove bottom sipes 7 are arranged at intervals S ⁇ b> 2 where the width direction narrow grooves 6 communicate with the circumferential direction narrow grooves 5, and the total is intended.
  • the drainage improvement effect is remarkable by setting the groove bottom sipe 7 to 60 [%] or more of the interval S2 of the part where the width direction narrow groove 6 communicates with the circumferential direction narrow groove 5.
  • the effect of maintaining the rigidity of the rib shape and block shape of the side rib-shaped land portion 41 uniformly in the tire width direction and the tire circumferential direction is remarkably obtained. It becomes possible. As a result, the effect of improving the uneven wear resistance and the effect of improving the WET performance can be remarkably obtained.
  • the groove bottom sipes 7 and 8 have the maximum groove depth D4 from the tread surface 2a and the maximum groove depth D1 of the circumferential main groove 3. In contrast, it is preferable to be in the range of 60 [%] to 90 [%].
  • the drainage improvement effect is remarkably achieved.
  • the effect of maintaining the rigidity of the rib shape and block shape of the side rib-shaped land portion 41 uniformly in the tire width direction and the tire circumferential direction can be significantly obtained. Is possible. As a result, the effect of improving the uneven wear resistance and the effect of improving the WET performance can be remarkably obtained.
  • the maximum groove depth D4 from the tread surface 2a of the groove bottom sipes 7 and 8 is set to the maximum groove depth D1 of the circumferential main groove 3 in order to obtain the effect of improving uneven wear resistance and the improvement of WET performance.
  • the range be 70% or more and 80% or less.
  • FIG. 5 shows the case where the circumferential main groove 3 is on the tire equatorial plane CL.
  • the circumferential main groove 3 on the tire equatorial plane CL is used as the center main groove 31.
  • the two main circumferential grooves 3 on both outer sides of the tire equatorial plane CL in the tire width direction are combined to form the center main groove 31. Therefore, the two center main grooves 31 are formed to be bent or curved in the tire width direction.
  • the circumferential main groove 3 forming the center main groove 31 is formed by being bent or curved, and thus has edge components in both the tire width direction and the tire circumferential direction, It becomes possible to improve the WET performance.
  • the circumferential narrow groove 5 and the circumferential main groove 3 maintain the same distance in the tire width direction, so that the rib shape of the side rib-shaped land portion 41 and the tire width direction dimensions of the block shape are uniform in the tire circumferential direction. Therefore, the effect of maintaining the rigidity of the rib shape and block shape of the side rib-shaped land portion 41 uniformly in the tire width direction and the tire circumferential direction can be significantly obtained.
  • the center main groove 31 has a groove width direction dimension L from the tire equatorial plane CL to the ground contact end T. 3 [%] to 15 [%], and each circumferential main groove 3 provided adjacent to the center main groove 31 with the side rib-shaped land portion 41 in between is the tire equatorial plane CL. Is preferably in the range of 50% to 60% of the tire width direction dimension L from the tire equatorial plane CL to the contact end T.
  • Each circumferential main groove 3 provided apart from the tire equatorial plane CL is positioned at the center of the groove width of the circumferential main groove 3 with respect to the position from the tire equatorial plane CL.
  • the contact end T is the contact area (when the pneumatic tire 1 is assembled to a regular rim and filled with a regular internal pressure and 70% of the regular load is applied, the tread portion 2 of the pneumatic tire 1 is applied. These are the outermost ends in the tire width direction of the region where the tread surface 2a is in contact with the road surface).
  • the contact end T is shown continuously in the tire circumferential direction.
  • the tire width direction dimension L from the tire equatorial plane CL to the ground contact edge T is This corresponds to 1/2 of the grounding width TW.
  • the regular rim is a “standard rim” defined by JATMA, a “Design Rim” defined by TRA, or a “Measuring Rim” defined by ETRTO.
  • the normal internal pressure is “maximum air pressure” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “INFLATION PRESSURES” defined by ETRTO.
  • the normal load is “maximum load capacity” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “LOAD CAPACITY” defined by ETRTO.
  • the groove width of the center main groove 31 disposed on the center side in the tire width direction is defined, and the circumferential main groove 3 adjacent to the outer side of the center main groove 31 in the tire width direction is defined.
  • the compound forming the tread portion 2 has a JIS hardness at 20 [° C.] of 60 or more and 75 or less.
  • this pneumatic tire 1 by making the JIS hardness at 20 [° C.] of the compound forming the tread portion 2 60 or more, the effect of improving the uneven wear resistance and the effect of improving the WET performance with an appropriate hardness. Can be obtained remarkably.
  • the JIS hardness at 20 [° C.] of the compound forming the tread portion 2 is 75, this is the maximum value used for a general pneumatic tire.
  • the pneumatic tire 1 of the present embodiment is preferably applied to a pneumatic tire for a small truck having a specified internal pressure of 600 [kPa] or less.
  • pneumatic tires for light trucks are mainly used for local driving, stop and go are frequently repeated at medium to low speed driving, and excellent wear resistance and gripping power (WET performance) are required.
  • WET performance wear resistance and gripping power
  • FIGS. 6 to 9 are charts showing the results of the performance test of the pneumatic tire according to this example.
  • performance tests on uneven wear resistance and WET performance were performed on multiple types of pneumatic tires with different conditions.
  • the evaluation method of uneven wear resistance performance is the uneven wear that occurred in the rib-like land portion after traveling 50,000 [km] at an average speed of 60 [km / h] on the test vehicle (side rib-like land portion and other The difference in the amount of wear on the tread surface from the rib-like land is measured. Based on this measurement result, index evaluation is performed with the conventional example 1 as a reference (100). This evaluation indicates that the larger the value, the better the uneven wear resistance performance.
  • the WET performance is evaluated by measuring the braking distance from an initial speed of 60 [km / h] on a test course on a wet road surface with a water depth of 10 ⁇ 1 [mm] using the test vehicle. Based on this measurement result, index evaluation is performed with the conventional example 1 as a reference (100). This evaluation shows that the larger the value, the better the WET performance.
  • the pneumatic tire of Conventional Example 1 has a rib-like land portion (side rib-shaped land portion) adjacent to both sides in the tire width direction of each circumferential main groove (center main groove) on both sides in the tire width direction of the tire equatorial plane.
  • Each end communicates with the circumferential main grooves on both sides of the tire width direction, and a plurality of narrow grooves in the width direction formed with a shallower depth than the circumferential main grooves are arranged to block the side rib-shaped land portions It is said.
  • the pneumatic tire of Comparative Example 1 is a rib-like land portion (side rib-shaped land portion) adjacent to both sides in the tire width direction of each circumferential main groove (center main groove) on both sides in the tire width direction of the tire equatorial plane.
  • the circumferential ribs extending in the tire circumferential direction and having a groove depth shallower than the circumferential main groove are arranged so that the side rib-shaped land portion has two rib shapes.
  • the pneumatic tire of Comparative Example 2 is connected to the circumferential ribs on both sides in the tire width direction in the side rib-shaped land portion, and the groove depth is larger than the circumferential main groove with respect to the pneumatic tire of Comparative Example 1.
  • a plurality of narrow grooves formed in the width direction are arranged to form a side rib-like land portion in a block shape.
  • narrow grooves are not formed in other rib-like land portions. Note that Comparative Example 1 and Comparative Example 2 are evaluated based on Conventional Example 1.
  • the pneumatic tires of Examples 1 to 41 are provided on both sides in the tire width direction of each circumferential main groove (center main groove) on both sides in the tire width direction on the tire equator plane.
  • each circumferential main groove center main groove
  • the pneumatic tires of Examples 1 to 41 are provided on both sides in the tire width direction of each circumferential main groove (center main groove) on both sides in the tire width direction on the tire equator plane.
  • side rib-shaped land portions from one side in the tire width direction of the side rib-shaped land portions to 40 [%] or more and 60 [%] of the tire width direction dimension of the side rib-shaped land portions.
  • a circumferential narrow groove extending along the tire circumferential direction and having a groove depth shallower than the circumferential main groove in the following range, and one end of the lateral rib-shaped land portion on the outer side in the tire width direction.
  • the other end communicates with the circumferential narrow groove and terminates and extends across the tire circumferential direction, and the groove depth is shallower than the circumferential main groove.
  • a plurality of widthwise narrow grooves formed in the tire circumferential direction, and a side rib-shaped land portion tire with the circumferential narrow groove as a boundary
  • the inward and ribs, the tire width direction outer side rib-like land portion in which the circumferential narrow groove as a boundary is a block shape.
  • no narrow grooves are formed in other rib-like land portions.
  • the groove depth of the narrow groove is defined.
  • a groove bottom sipe is formed at the groove bottom of the widthwise narrow groove.
  • a groove bottom sipe is formed at the groove bottom of the circumferential narrow groove.
  • groove bottom sipes are formed at the groove bottoms of the width direction narrow grooves and the circumferential direction narrow grooves.
  • the pneumatic tires of Example 39 and Example 41 the circumferential main groove and the circumferential narrow groove are bent (see FIG. 5).
  • the pneumatic tires of Example 40 and Example 41 satisfy the regulation of the groove width of the center main groove and the position of the adjacent circumferential main groove.
  • the conventional example 1 is evaluated as a reference.
  • the rib-shaped land portions (side rib-shaped land portions) adjacent to both sides in the tire width direction of the circumferential main groove (center main groove) on the tire equatorial plane are both sides in the tire width direction.
  • Each of the ends communicates with the circumferential main groove, and a plurality of narrow grooves in the width direction formed with a groove depth shallower than the circumferential main groove are arranged to form the side rib-shaped land portion in a block shape.
  • the circumferential direction of the circumferential main groove (center main groove) on the tire equatorial plane is adjacent to both sides in the tire width direction, and the circumferential direction of the tire is in the tire circumferential direction.
  • the lateral rib-like land portion is formed in two rib shapes by disposing a circumferential narrow groove formed to extend in the direction of the groove and having a groove depth shallower than the circumferential main groove.
  • the pneumatic tire of Comparative Example 4 is connected to the circumferential ribs on both sides in the tire width direction on the side rib-shaped land portion, and the groove depth of the pneumatic tire of Comparative Example 4 is larger than that of the circumferential main groove.
  • a plurality of narrow grooves formed in the width direction are arranged to form a side rib-like land portion in a block shape.
  • the conventional example 2 is an index based on the conventional example 1, and the comparative example 3 and the comparative example 4 are evaluated based on the conventional example 2.
  • the pneumatic tires of Examples 42 to 82 are rib-like land adjacent to both sides in the tire width direction of the circumferential main groove (center main groove) on the tire equator plane.
  • a circumferential narrow groove extending along the tire circumferential direction and having a groove depth shallower than the circumferential main groove, and one circumferential end adjacent to the outer side in the tire width direction of the side rib-shaped land portion.
  • the other end communicates with the circumferential groove and terminates and extends across the tire circumferential direction, and has a groove depth shallower than the circumferential main groove.
  • a plurality of widthwise narrow grooves arranged in the direction, and ribs on the inner side in the tire width direction of the side rib-shaped land portion with the circumferential narrow groove as a boundary And Jo, the tire width direction outer side rib-like land portion in which the circumferential narrow groove as a boundary is a block shape.
  • no narrow grooves are formed in the other rib-like land portions.
  • the groove depth of the narrow groove is defined.
  • a groove bottom sipe is formed at the groove bottom of the widthwise narrow groove.
  • a groove bottom sipe is formed at the groove bottom of the circumferential narrow groove.
  • groove bottom sipes are formed at the groove bottoms of the width direction narrow grooves and the circumferential direction narrow grooves.
  • the pneumatic tires of Example 80 and Example 82 the circumferential main groove and the circumferential narrow groove are bent (see FIG. 5).
  • the pneumatic tires of Example 81 and Example 82 satisfy the regulation of the groove width of the center main groove and the position of the adjacent circumferential main groove. Note that Examples 42 to 82 are evaluated based on Conventional Example 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
PCT/JP2013/072334 2012-09-06 2013-08-21 空気入りタイヤ WO2014038378A1 (ja)

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CN107206847A (zh) * 2015-01-30 2017-09-26 株式会社普利司通 充气轮胎
JP2018024420A (ja) * 2016-08-03 2018-02-15 横浜ゴム株式会社 空気入りタイヤ
EP3564048A1 (en) * 2018-05-02 2019-11-06 Sumitomo Rubber Industries, Ltd. Tyre

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JP6032242B2 (ja) * 2014-05-12 2016-11-24 横浜ゴム株式会社 更生タイヤ
JP6052227B2 (ja) * 2014-05-12 2016-12-27 横浜ゴム株式会社 更生タイヤ
JP6369185B2 (ja) * 2014-07-11 2018-08-08 横浜ゴム株式会社 更生タイヤ
JP6393658B2 (ja) * 2015-05-25 2018-09-19 株式会社ブリヂストン 空気入りタイヤ
JP6517601B2 (ja) * 2015-06-19 2019-05-22 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
CN109715413A (zh) * 2016-08-08 2019-05-03 普利司通奔达可有限责任公司 用于改善轮胎的抗崩花性和抗裂性的装置和方法
US11135877B2 (en) * 2017-09-19 2021-10-05 Sumitomo Rubber Industries, Ltd. Tire

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JP2012091736A (ja) * 2010-10-28 2012-05-17 Yokohama Rubber Co Ltd:The 空気入りタイヤ
WO2012098895A1 (ja) * 2011-01-19 2012-07-26 株式会社ブリヂストン 空気入りタイヤ
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CN107206847A (zh) * 2015-01-30 2017-09-26 株式会社普利司通 充气轮胎
CN107206847B (zh) * 2015-01-30 2019-08-27 株式会社普利司通 充气轮胎
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JP2018024420A (ja) * 2016-08-03 2018-02-15 横浜ゴム株式会社 空気入りタイヤ
EP3564048A1 (en) * 2018-05-02 2019-11-06 Sumitomo Rubber Industries, Ltd. Tyre
US11535062B2 (en) 2018-05-02 2022-12-27 Sumitomo Rubber Industries, Ltd. Tyre

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