WO2010058627A1 - 空気入りタイヤ - Google Patents

空気入りタイヤ Download PDF

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Publication number
WO2010058627A1
WO2010058627A1 PCT/JP2009/063552 JP2009063552W WO2010058627A1 WO 2010058627 A1 WO2010058627 A1 WO 2010058627A1 JP 2009063552 W JP2009063552 W JP 2009063552W WO 2010058627 A1 WO2010058627 A1 WO 2010058627A1
Authority
WO
WIPO (PCT)
Prior art keywords
land portion
groove
grooves
tire
circumferential direction
Prior art date
Application number
PCT/JP2009/063552
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
良介 温品
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 DE112009001452.6T priority Critical patent/DE112009001452B4/de
Priority to AU2009318659A priority patent/AU2009318659B2/en
Priority to RU2010144775/11A priority patent/RU2468930C2/ru
Priority to US12/995,203 priority patent/US8162015B2/en
Priority to JP2010511838A priority patent/JP4548551B2/ja
Priority to CN200980118187.2A priority patent/CN102036839B/zh
Publication of WO2010058627A1 publication Critical patent/WO2010058627A1/ja

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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
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
    • B60C11/1392—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B60C11/0309—Patterns comprising block rows or discontinuous ribs further characterised by the groove cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0381—Blind or isolated grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0381—Blind or isolated grooves
    • B60C2011/0383—Blind or isolated grooves at the centre of the tread
    • 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
    • B60C2011/0388—Continuous ribs provided at the equatorial plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S152/00—Resilient tires and wheels
    • Y10S152/03—Slits in threads

Definitions

  • the present invention relates to a pneumatic tire provided with a plurality of main grooves extending in the circumferential direction of the tire in a tread portion, and more particularly to a pneumatic tire capable of achieving both drainage performance and uneven wear resistance.
  • the pneumatic tire generally has a plurality of main grooves extending in the tire circumferential direction in the tread portion. These main grooves have a relatively large cross-sectional area and carry drainage performance. Further, drainage performance can be further enhanced by providing a plurality of lug grooves extending in the tire width direction in the tread portion and connecting the lug grooves to the main groove.
  • An object of the present invention is to provide a pneumatic tire capable of improving drainage performance while maintaining good resistance to uneven wear.
  • the pneumatic tire according to the present invention for achieving the above object is a pneumatic tire in which at least three main grooves extending in the circumferential direction of the tire are provided in a tread portion, and a plurality of rows of land portions are divided by these main grooves.
  • a pair of land portions located on both sides of any of the main grooves except the main groove in the width direction is specified, a plurality of land portions inclined with respect to the tire circumferential direction to one land portion of the pair of land portions
  • a first inclined groove is provided, and a plurality of second inclined grooves inclined in the same direction as the first inclined groove are provided in the other land portion of the pair of land portions, and one end of each first inclined groove is used as the pair The other end is terminated in the one land while opening to the main groove located between the lands of the second, and one end of each second inclined groove is opened to the main groove located between the pair of lands The other end is terminated in the other land portion.
  • the pneumatic tire according to the present invention for achieving the above object is a pneumatic tire having a tread pattern in which the mounting direction of the front and back of the tire when the vehicle is mounted is specified and is asymmetrical on both sides of the tire equator.
  • the main groove is provided with at least four main grooves extending in the tire circumferential direction, and a plurality of rows of land portions are partitioned by these main grooves, and a plurality of slopes with respect to the tire circumferential direction to the center land portion located on the tire equator
  • a first inclined groove is provided, and a plurality of second inclined grooves inclined in the same direction as the first inclined groove are provided in an inner intermediate land portion located on the vehicle inner side of the center land portion;
  • the other end is terminated in the center land portion while the other end is opened in the main groove located between the center land portion and the inner intermediate land portion, and one end of each second inclined groove is the center land portion and the inner intermediate land portion
  • It is characterized in that to terminate the other end with an opening in location to the main groove in an inner middle land portion.
  • one land portion of the pair of land portions is closed at one end of the first land type.
  • the other land portion of the pair of land portions is provided with a one-end closed type second inclined groove inclined in the same direction as the first inclined groove, and the first inclined groove and the second land portion One end is opened in a common main groove located between a pair of lands. Since such a main groove is located at a position on the tire equatorial side of the outermost main groove in the tire width direction and where the contact length in the circumferential direction of the tire is relatively large, the main groove has a first inclined groove and a second slope.
  • an average inclination angle ⁇ with respect to the tire circumferential direction of an outline having an acute angle with the edge of one land portion of the first inclined groove, and an acute angle with the edge of the other land portion of the second inclined groove is preferably 20 ° to 50 °.
  • the drainage performance is improved by making the average inclination angles ⁇ and ⁇ of the first inclined groove and the second inclined groove smaller than the respective upper limit values, and the partial wear resistance is improved by making the average inclination angles ⁇ and ⁇ larger than the respective lower limit values. it can.
  • the inclination angle of the contour line forming an acute angle with the edge of one land portion of the first inclined groove with respect to the tire circumferential direction is gradually decreased from the opening end of the first inclined groove to at least the central position in the groove length direction; It is preferable that the inclination angle with respect to the tire circumferential direction of the outline forming an acute angle with the edge of the other land portion of the groove be gradually reduced from the open end of the second inclined groove to at least the central position in the groove length direction. Thereby, excellent drainage performance can be exhibited.
  • the minimum distance ⁇ 1 from the edge opposite to the edge where the first inclined groove on one land portion is open to the first inclined groove is 10% to 40% of the width of the one land portion, and the other land It is preferable that the minimum distance ⁇ 2 from the edge opposite to the edge on the side where the second inclined groove opens to the second inclined groove be 10% to 40% of the width of the other land.
  • the drainage performance can be improved by making the minimum distances ⁇ 1 and ⁇ 2 of the first inclined groove and the second inclined groove smaller than the respective upper limits, and the partial wear resistance can be improved by making the minimum distances ⁇ 1 and ⁇ 2 larger than the respective lower limits. .
  • the land portion provided with the first inclined groove or the second inclined groove it is preferable to provide a plurality of chamfered portions on the edge opposite to the edge on the side where the first inclined groove or the second inclined groove opens.
  • the partial abrasion resistance can be improved.
  • the maximum width of the chamfer is 10% to 30% of the width of the land, and the maximum depth of the chamfer is from the wear indicator of the main groove to the tread in order to obtain sufficient improvement effect on uneven wear resistance.
  • the maximum width position of the chamfered portion is preferably disposed between the end of the pair of sloped grooves adjacent in the tire circumferential direction and the open end.
  • the mounting direction of the front and back of the tire when mounted on a vehicle is specified, focusing on a pneumatic tire having a tread pattern that is asymmetrical on both sides of the tire equator.
  • the first land groove of the one end closed type is provided in the center land portion while the mounting direction of the front and back of the tire is specified.
  • An intermediate land portion is provided with a one-end closed second inclined groove inclined in the same direction as the first inclined groove, and one end of the first inclined groove and the second inclined groove is provided between the center land portion and the inner intermediate land portion.
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the contour line forming an acute angle with the edge of the center land portion of the first inclined groove is 30 ° to 50 °
  • the edge of the inner intermediate land portion of the second inclined groove is The average inclination angle ⁇ with respect to the tire circumferential direction of the acute angled contour line is preferably 20 ° to 40 °.
  • the drainage performance is improved by making the average inclination angles ⁇ and ⁇ of the first inclined groove and the second inclined groove smaller than the respective upper limit values, and the partial wear resistance is improved by making the average inclination angles ⁇ and ⁇ larger than the respective lower limit values. it can.
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the outline forming an acute angle with the edge of the center land portion of the first inclined groove and the tire circumference of the outline forming an acute angle with the edge of the inner intermediate land of the second inclined groove It is preferable that the relationship with the average inclination angle ⁇ to the direction be ⁇ > ⁇ . Thereby, drainage performance can be improved while securing the rigidity of the center land portion.
  • the inclination angle of the contour line forming an acute angle with the edge of the center land portion of the first inclined groove with respect to the tire circumferential direction is gradually decreased from the opening end of the first inclined groove to at least the central position in the groove length direction.
  • the inclination angle of the contour line forming an acute angle with the edge of the inner middle land portion with respect to the tire circumferential direction is gradually reduced from the open end of the second inclined groove to at least the central position in the groove length direction.
  • the minimum distance ⁇ 1 from the edge opposite to the edge where the first inclined groove on the central land portion is open to the first inclined groove is 10% to 40% of the width of the central land portion
  • the minimum distance ⁇ 2 from the edge opposite to the edge where the second inclined groove is opened to the second inclined groove is preferably 10% to 40% of the width of the inner intermediate land portion.
  • a plurality of chamfers are provided on the edge of the center land portion outside the vehicle.
  • the partial abrasion resistance can be improved.
  • the maximum width of the chamfer is 10% to 30% of the width of the center land, and the maximum depth of the chamfer is the tread surface from the wear indicator of the main groove
  • the maximum width position of the chamfered portion is preferably 10% or more of the effective depth to the maximum, and is disposed between the end of the pair of first inclined grooves adjacent in the tire circumferential direction and the open end.
  • the outer intermediate land portion located on the vehicle outer side of the center land portion has a rib structure continuous in the tire circumferential direction. This makes it possible to compensate for the decrease in rigidity due to the first and second inclined grooves provided to improve drainage performance, and to improve cornering.
  • a plurality of lug grooves extending in the tire width direction be provided on the outer side shoulder land portion located on the vehicle outer side, and these lug grooves communicate with the main groove adjacent to the outer shoulder land portion.
  • the drainage capacity of the main groove adjacent to the outer shoulder land portion can be enhanced, and drainage performance of the entire tread can be improved.
  • a plurality of lug grooves extending in the tire width direction be provided on the inner side shoulder land portion located inside the vehicle, and the lug grooves be not in communication with the main groove adjacent to the inner shoulder land portion. Since the heel and toe wear is apt to occur at the inner shoulder land portion located inside the vehicle, the uneven wear resistance can be improved by making the lug groove not in communication with the main groove adjacent to the inner shoulder land portion. it can.
  • FIG. 1 is a development view showing a tread pattern of a pneumatic tire according to an embodiment of the present invention.
  • FIG. 2 is an enlarged plan view of the center land portion and the inner middle land portion in FIG.
  • FIG. 3 is a perspective view showing the main part of the center land portion.
  • FIG. 4 is a side view showing the main part of the center land portion.
  • FIG. 5 is a developed view showing a tread pattern of a pneumatic tire according to another embodiment of the present invention.
  • 6 is a plan view showing the center land portion and the outer middle land portion in FIG. 5 in an enlarged manner.
  • FIG. 7 is a developed view showing a tread pattern of a pneumatic tire according to still another embodiment of the present invention.
  • FIG. 8 is an enlarged plan view showing a pair of center land portions in FIG.
  • FIG. 1 shows a tread pattern of a pneumatic tire according to an embodiment of the present invention
  • FIG. 2 shows a center land portion and an inner middle land portion in FIG. 1
  • FIGS. 3 and 4 show main portions of the center land portion. It is shown.
  • the mounting direction of the front and back of the tire when the vehicle is mounted is designated, the outside of the vehicle is indicated by OUT, and the inside of the vehicle is indicated by IN.
  • main grooves 1a, 1b, 1c, 1d extending in the circumferential direction of the tire are sequentially formed from the vehicle inner side to the vehicle outer side, and these main grooves 1a to 1d form five rows.
  • Land sections 10, 20, 30, 40 and 50 are divided. That is, the inner shoulder land portion 10 is located in the shoulder region inside the vehicle, the inner intermediate land portion 20 is located between the main grooves 1a and 1b, and the center land portion 30 is between the main grooves 1b and 1c on the tire equator CL.
  • the outer intermediate land portion 40 is located between the main grooves 1c and 1d, and the outer shoulder land portion 50 is located in the shoulder region outside the vehicle.
  • the main grooves 1a to 1d have a groove width of 5.0 mm to 15.0 mm and a groove depth of 7.5 mm to 9.0 mm.
  • a plurality of inclined grooves 31 (first inclined grooves) inclined with respect to the tire circumferential direction are formed at intervals in the tire circumferential direction.
  • Each inclined groove 31 opens at one end into the main groove 1 b located between the center land portion 30 and the inner intermediate land portion 20, and the other end ends in the center land portion 30.
  • the groove width of these inclined grooves 31 may be constant, it is desirable that the groove width be narrower toward the end as shown in the drawing.
  • a plurality of sipes 32 communicating with only the main groove 1b are formed in the center land portion 30, and the inclined grooves 31 and the sipes 32 are alternately arranged along the tire circumferential direction.
  • a plurality of chamfered portions 33 are formed on the edge of the center land portion 30 on the vehicle outer side.
  • Each chamfered portion 33 has a pair of inclined surfaces forming a triangle.
  • the chamfered portions 33 are disposed so as to be located between a pair of inclined grooves 31 adjacent to each other in the tire circumferential direction.
  • a plurality of inclined grooves 21 (second inclined grooves) inclined in the same direction as the inclined groove 31 are formed at intervals in the tire circumferential direction.
  • Each inclined groove 21 opens at one end into the main groove 1 b located between the center land portion 30 and the inner intermediate land portion 20, and the other end terminates in the inner intermediate land portion 20.
  • the groove width of these inclined grooves 21 may be constant, it is desirable that the groove width is narrowed toward the end as shown in the drawing.
  • a plurality of sipes 22 communicating with only the main groove 1b are formed in the inner intermediate land portion 20, and the inclined grooves 21 and the sipes 22 are alternately arranged along the tire circumferential direction.
  • the outer intermediate land portion 40 is formed with a narrow groove 41 extending in the tire circumferential direction.
  • the narrow groove 41 has a groove width of 1.0 mm to 3.0 mm, a groove depth of 1.0 mm to 2.5 mm, and is shallower and narrower than the main grooves 1a to 1d.
  • the outer intermediate land portion 40 is not divided by a groove extending in the tire width direction, and has a rib structure continuous in the tire circumferential direction.
  • a plurality of lug grooves 11 extending in the tire width direction and a plurality of sipes 12 extending in the tire width direction are formed.
  • the lug grooves 11 and the sipes 12 are alternately arranged at intervals in the tire circumferential direction.
  • the lug groove 11 and the sipe 12 are both out of communication with the main groove 1 a adjacent to the inner shoulder land portion 10.
  • a plurality of lug grooves 51 extending in the tire width direction are formed in the outer shoulder land portion 50 at intervals in the tire circumferential direction.
  • the lug grooves 51 communicate with the main groove 1 d adjacent to the outer shoulder land portion 50.
  • a plurality of sipes 52 are formed in the outer shoulder land portion 50 so as to straddle a pair of lug grooves 51 adjacent to each other in the tire circumferential direction.
  • the center land portion 30 is provided with the inclined groove 31 of the one end closed type, while the inner intermediate land portion 20 is the inclined groove 21 of the one end closed type inclined in the same direction.
  • one end of the inclined grooves 21 and 31 is opened in the common main groove 1d located between the center land portion 30 and the inner intermediate land portion 20, so that drainage performance can be effectively enhanced.
  • the drainage ability based on the main groove 1 d is enhanced by arranging the inclined groove 21 and the inclined groove 31 substantially in point symmetry so that the opening end of the inclined groove 21 and the opening end of the inclined groove 31 face each other. be able to.
  • the inclined grooves 21 and 31 do not divide the land portions 20 and 30, uneven wear resistance is also excellent. Therefore, it is possible to effectively enhance drainage performance while maintaining good partial abrasion resistance.
  • the inclination angle of the contour line forming an acute angle with the edge of the center land portion 30 of the inclined groove 31 with respect to the tire circumferential direction is at least from the opening end position P0 of the inclined groove 31.
  • the inclination angle to the tire circumferential direction of the contour line forming an acute angle with the edge of the inner intermediate land portion 20 of the inclined groove 21 gradually decreases to the groove longitudinal direction center position P1 at least the groove length from the open end position P0 of the inclined groove 21 It gradually decreases to the longitudinal center position P1. This makes it possible to form a good water flow and to exhibit excellent drainage performance.
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the contour line forming an acute angle with the edge of the center land portion 30 of the inclined groove 31 is set in the range of 30 ° to 50 °, and the edge of the inner intermediate land portion 20 of the inclined groove 21
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the acute angled contour line is set in the range of 20 ° to 40 °.
  • the average inclination angles ⁇ and ⁇ are average inclination angles from the opening end position P0 of each inclined groove to the central position P1 in the groove length direction.
  • the average inclination angles ⁇ and ⁇ become smaller than the respective lower limits, uneven wear due to chipping tends to occur near the opening end. Further, the average inclination angle ⁇ of the inclined grooves 31 and the average inclination angle ⁇ of the inclined grooves 21 satisfy the relationship of ⁇ > ⁇ . By setting ⁇ > ⁇ , drainage performance can be improved while securing the rigidity of the center land portion 30.
  • the minimum distance ⁇ 1 from the edge opposite to the edge where the inclined groove 31 of the center land portion 30 is open to the inclined groove 31 is in the range of 10% to 40% of the width W30 of the center land portion 30.
  • the minimum distance ⁇ 2 from the edge opposite to the edge where the inclined groove 21 of the inner intermediate land portion 20 is opened to the inclined groove 21 is in the range of 10% to 40% of the width W20 of the inner intermediate land portion 20. It is good to set to. Thereby, drainage performance and partial abrasion resistance can be compatible.
  • the maximum width Wmax of the chamfered portion 33 may be set in the range of 10% to 30% of the width W30 of the center land portion 30.
  • the maximum width Wmax of the chamfered portion 33 is less than 10% of the width W30 of the center land portion 30, the effect of suppressing uneven wear by the chamfered portion 33 becomes insufficient, and conversely, when it exceeds 30%, the rigidity of the center land portion 30 Is apt to cause uneven wear due to a significant decrease in
  • the maximum depth Hmax of the chamfered portion 33 may be set to 10% or more of the effective depth D of the main groove 1c, as shown in FIG.
  • the effective depth D of the main groove 1c is the depth from the wear indicator 2 disposed in the main groove 1c to the tread surface. If the maximum depth Hmax of the chamfered portion 33 is less than 10% of the effective depth D of the main groove 1c, the effect of suppressing uneven wear becomes insufficient.
  • the maximum width position of the chamfered portion 33 may be disposed between the end of the pair of inclined grooves 31 and 31 adjacent to each other in the tire circumferential direction and the opening end. That is, as shown in FIG. 2, the region having the maximum width Wmax of the chamfered portion 33 in the region X defined between the end of the pair of inclined grooves 31, 31 adjacent in the tire circumferential direction and the opening end It is good to arrange. Thereby, uneven wear can be effectively suppressed.
  • the outer intermediate land portion 40 located on the vehicle outer side of the center land portion 30 into a rib structure continuous in the tire circumferential direction, it is possible to use inclined grooves 21 and 31 provided to improve drainage performance.
  • the cornering property can be improved by compensating for the decrease in rigidity of the land portions 20 and 30 resulting therefrom.
  • a plurality of lug grooves 51 extending in the tire width direction are provided in the outer shoulder land portion 50 located on the vehicle outer side, and the lug grooves 51 are communicated with the main groove 1d adjacent to the outer shoulder land portion 50.
  • the drainage capacity of the main groove 1d adjacent to the shoulder land portion 50 can be enhanced to improve the drainage performance of the entire tread.
  • the sipe 52 straddling between the pair of lug grooves 51, 51 contributes to the prevention of uneven wear in the outer shoulder land portion 50.
  • lug grooves 11 extending in the tire width direction are provided in the inner shoulder land portion 10 located inside the vehicle, and these lug grooves 11 are not communicated with the main groove 1a adjacent to the inner shoulder land portion 10 As a result, uneven wear on the inner shoulder land portion 10 can be prevented.
  • FIG. 5 shows a tread pattern of a pneumatic tire according to another embodiment of the present invention
  • FIG. 6 shows a center land portion and an outer intermediate land portion in FIG.
  • the mounting direction of the front and back of the tire when the vehicle is mounted is designated, the outside of the vehicle is indicated by OUT, and the inside of the vehicle is indicated by IN.
  • main grooves 1a, 1b, 1c, 1d extending in the circumferential direction of the tire are sequentially formed from the vehicle inner side to the vehicle outer side, and these main grooves 1a to 1d form five rows.
  • Land portions 110, 120, 130, 140, and 150 are divided. That is, the inner shoulder land portion 110 is located in the shoulder region inside the vehicle, the inner intermediate land portion 120 is located between the main grooves 1a and 1b, and the center land portion 130 is between the main grooves 1b and 1c on the tire equator CL.
  • the outer intermediate land portion 140 is located between the main grooves 1c and 1d, and the outer shoulder land portion 150 is located in the shoulder region outside the vehicle.
  • the outer intermediate land portion 140 is formed with a plurality of inclined grooves 141 (first inclined grooves) inclined with respect to the tire circumferential direction at intervals in the tire circumferential direction.
  • Each inclined groove 141 opens at one end into the main groove 1 c located between the center land portion 130 and the outer intermediate land portion 140, and the other end terminates in the outer intermediate land portion 140.
  • the groove width of these inclined grooves 141 may be constant, it is desirable that the groove width is narrowed toward the end as shown.
  • a plurality of sipes 142 communicating with only the main groove 1c are formed in the outer intermediate land portion 140, and the inclined grooves 141 and the sipes 142 are alternately arranged along the tire circumferential direction.
  • a plurality of chamfered portions 143 are formed on the edge of the outer intermediate land portion 140 on the vehicle outer side.
  • Each chamfered portion 143 has a pair of inclined surfaces forming a triangle.
  • the chamfered portions 143 are disposed so as to be located between a pair of inclined grooves 141 adjacent to each other in the tire circumferential direction.
  • a plurality of inclined grooves 131 (second inclined grooves) inclined in the same direction as the inclined grooves 141 are formed at intervals in the tire circumferential direction.
  • Each inclined groove 131 opens at a main groove 1 c located between the center land portion 130 and the outer intermediate land portion 140 at one end, and terminates at the other end in the center land portion 130.
  • the groove width of these inclined grooves 131 may be constant, it is desirable that the groove width be narrower toward the end as shown in the drawing.
  • a plurality of sipes 132 communicating with only the main groove 1c is formed in the center land portion 130, and the inclined grooves 131 and the sipes 132 are alternately arranged along the tire circumferential direction.
  • a plurality of inclined grooves 131 inclined in the same direction as the inclined grooves 131 are formed in the inner intermediate land portion 120 at intervals in the tire circumferential direction.
  • Each inclined groove 121 opens at one end to the main groove 1b located between the center land portion 130 and the inner intermediate land portion 120, and the other end is connected to the adjacent inclined groove 121 land portion.
  • the groove width of these inclined grooves 121 may be constant, it is desirable that the groove width be narrower toward the end as shown in the drawing.
  • the inner shoulder land portion 110 is formed with a plurality of lug grooves 111 extending in the tire width direction and a plurality of sipes 112 extending in the tire width direction.
  • the lug grooves 111 and the sipes 112 are alternately arranged at intervals in the tire circumferential direction.
  • the lug groove 111 and the sipe 112 are both out of communication with the main groove 1 a adjacent to the inner shoulder land portion 110.
  • the outer shoulder land portion 150 is formed with a plurality of lug grooves 151 extending in the tire width direction and a plurality of sipes 152 extending in the tire width direction.
  • the lug grooves 151 and the sipes 152 are alternately arranged at intervals in the tire circumferential direction.
  • the lug groove 151 communicates with the main groove 1d adjacent to the outer shoulder land portion 150, but the sipe 152 does not communicate with the main groove 1d.
  • the outer intermediate land portion 140 is provided with the inclined groove 141 of the one end closed type, while the center land portion 130 is the inclined groove 131 of the one end closed type inclined in the same direction as the inclined groove 141.
  • one end of the inclined grooves 131 and 141 is opened in the common main groove 1c located between the center land portion 130 and the outer intermediate land portion 140, so that drainage performance can be effectively enhanced.
  • the drainage ability based on the main groove 1c is enhanced by arranging the inclined groove 131 and the inclined groove 141 substantially in point symmetry so that the opening end of the inclined groove 131 and the opening end of the inclined groove 141 face each other. be able to.
  • the inclined grooves 131 and 141 do not divide the land portions 130 and 140, they have excellent uneven wear resistance. Therefore, it is possible to effectively enhance drainage performance while maintaining good partial abrasion resistance.
  • the inclination angle of the contour line forming an acute angle with the edge of the outer intermediate land portion 140 of the inclined groove 141 with respect to the tire circumferential direction is from the open end position P0 of the inclined groove 141.
  • the inclination angle of the contour line forming an acute angle with the edge of the center land portion 130 of the inclined groove 131 gradually decreases to at least the center position P1 in the groove length direction at least the groove length from the open end position P0 of the inclined groove 131 It gradually decreases to the longitudinal center position P1. This makes it possible to form a good water flow and to exhibit excellent drainage performance.
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the contour line forming an acute angle with the edge of the outer intermediate land portion 140 of the inclined groove 141 is set in the range of 30 ° to 50 °, and the edge of the center land portion 130 of the inclined groove 131
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the acute angled contour line is set in the range of 20 ° to 40 °.
  • the average inclination angles ⁇ and ⁇ are average inclination angles from the opening end position P0 of each inclined groove to the central position P1 in the groove length direction.
  • the average inclination angles ⁇ and ⁇ become larger than the respective upper limits, the resistance of the water flowing in the grooves increases, and the drainage performance is degraded.
  • the average inclination angles ⁇ and ⁇ become smaller than the respective lower limits, uneven wear due to chipping tends to occur near the opening end.
  • the minimum distance ⁇ 1 from the edge opposite to the edge where the inclined groove 141 of the outer intermediate land portion 140 is open to the inclined groove 141 is 10% to 40% of the width W 140 of the outer intermediate land portion 140.
  • the minimum distance ⁇ 2 from the edge opposite to the edge on the side where the inclined groove 131 of the center land portion 130 is set to the range is a range of 10% to 40% of the width W130 of the center land portion 130 from the edge on the opposite side It is good to set to. Thereby, drainage performance and partial abrasion resistance can be compatible.
  • the uneven wear resistance can be obtained by providing such a chamfered portion 143. It can be improved.
  • a large lateral G occurs as in the circuit travel, the portion near the end of the inclined groove 141 in the outer intermediate land portion 140 is deformed, and only the portion tends to be not worn since it does not contact the ground. Therefore, by selectively providing the chamfered portion 143 in a portion other than the vicinity of the end of the inclined groove 141 in the outer intermediate land portion 140, it is possible to suppress uneven wear due to the inclined groove 141.
  • the maximum width of the chamfered portion 143 may be set in the range of 10% to 30% of the width W140 of the outer intermediate land portion 140 for the same reason as described above. Further, the maximum depth of the chamfered portion 143 may be set to 10% or more of the effective depth of the main groove 1d for the same reason as described above.
  • the maximum width position of the chamfered portion 143 may be disposed between the end of the pair of inclined grooves 141 and 141 adjacent to each other in the tire circumferential direction and the opening end, for the same reason as described above. That is, as shown in FIG. 6, the region having the maximum width of the chamfered portion 143 is disposed in the region X defined between the end of the pair of inclined grooves 141 and 141 adjacent to the tire circumferential direction and the opening end. Good.
  • a plurality of lug grooves 151 extending in the tire width direction are provided in the outer shoulder land portion 150 located on the vehicle outer side, and the lug grooves 151 are communicated with the main groove 1d adjacent to the outer shoulder land portion 150.
  • the drainage capacity of the main groove 1d adjacent to the shoulder land portion 150 can be enhanced to improve the drainage performance of the entire tread.
  • lug grooves 111 extending in the tire width direction are provided in the inner shoulder land portion 110 located inside the vehicle, and these lug grooves 111 are not in communication with the main groove 1a adjacent to the inner shoulder land portion 110. As a result, uneven wear on the inner shoulder land portion 110 can be prevented.
  • FIG. 7 shows a tread pattern of a pneumatic tire according to still another embodiment of the present invention
  • FIG. 8 shows a pair of center land portions in FIG.
  • the mounting direction of the front and back of the tire when the vehicle is mounted is not designated.
  • the tread portion T As shown in FIG. 7, in the tread portion T, three main grooves 1a, 1b and 1c extending in the circumferential direction of the tire are formed, and land portions 210, 220, 230 and 240 of four rows are formed by these main grooves 1a to 1c. Is divided. That is, the pair of shoulder land portions 210 and 240 are respectively located in the shoulder region, and the pair of center land portions 220 and 230 are located on both sides of the tire equator CL.
  • the center land portion 230 is formed with a plurality of inclined grooves 231 (first inclined grooves) inclined with respect to the tire circumferential direction at intervals in the tire circumferential direction.
  • Each inclined groove 231 opens at one end into the main groove 1 b located between the center lands 220 and 230, and the other end terminates in the center land 230.
  • the groove width of these inclined grooves 231 may be constant, it is desirable that the groove width is narrowed toward the end as shown in the drawing.
  • a plurality of sipes 232 communicating with only the main groove 1b are formed in the center land portion 230, and the inclined grooves 231 and the sipes 232 are alternately arranged along the tire circumferential direction.
  • a plurality of inclined grooves 221 (second inclined grooves) inclined in the same direction as the inclined grooves 231 are formed at intervals in the tire circumferential direction.
  • Each of the inclined grooves 221 opens in the main groove 1 b located at one end between the center lands 220 and 230, and the other end terminates in the center land 220.
  • the groove width of these inclined grooves 221 may be constant, it is desirable that the groove width is narrowed toward the end as shown in the drawing.
  • a plurality of sipes 222 communicating with only the main groove 1b are formed in the center land portion 220, and the inclined grooves 221 and the sipes 222 are alternately arranged along the tire circumferential direction.
  • a plurality of lug grooves 211 extending in the tire width direction and a plurality of sipes 212 extending in the tire width direction are formed.
  • the lug grooves 211 and the sipes 212 are alternately arranged at intervals in the tire circumferential direction.
  • the lug groove 211 communicates with the main groove 1a adjacent to the shoulder land portion 210, the sipe 212 does not communicate with the main groove 1a.
  • the shoulder land portion 240 is formed with a plurality of lug grooves 241 extending in the tire width direction and a plurality of sipes 242 extending in the tire width direction.
  • the lug grooves 241 and the sipes 242 are alternately arranged at intervals in the tire circumferential direction.
  • the lug groove 241 communicates with the main groove 1c adjacent to the shoulder land portion 240, but the sipe 242 does not communicate with the main groove 1c.
  • the center land portion 230 is provided with the inclined groove 231 of the one end closed type, while the center land portion 220 is the inclined groove 221 of the one end closed type inclined in the same direction as the inclined groove 231.
  • the drainage performance can be effectively enhanced.
  • the drainage ability based on the main groove 1b is enhanced by arranging the inclined groove 221 and the inclined groove 231 substantially point-symmetrically so that the opening end of the inclined groove 221 and the opening end of the inclined groove 231 face each other. be able to.
  • the inclined grooves 221 and 231 do not divide the land portions 220 and 230, they have excellent uneven wear resistance. Therefore, it is possible to effectively enhance drainage performance while maintaining good partial abrasion resistance.
  • the inclination angle of the contour line forming an acute angle with the edge of the center land portion 230 of the inclined groove 231 with respect to the tire circumferential direction is at least from the opening end position P0 of the inclined groove 231.
  • the inclination angle of the contour line forming the acute angle with the edge of the center land portion 220 of the inclined groove 221 gradually decreases to the center position P1 of the groove length direction with respect to the tire circumferential direction is at least the groove length from the open end position P0 of the inclined groove 221 It gradually decreases to the direction center position P1. This makes it possible to form a good water flow and to exhibit excellent drainage performance.
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the contour line forming an acute angle with the edge of the center land portion 230 of the inclined groove 231 is set in the range of 20 ° to 50 °.
  • the average inclination angle ⁇ with respect to the tire circumferential direction of the acute angled contour line is set in the range of 20 ° to 50 °.
  • the average inclination angles ⁇ and ⁇ are average inclination angles from the opening end position P0 of each inclined groove to the central position P1 in the groove length direction.
  • the minimum distance ⁇ 1 from the edge opposite to the edge where the inclined groove 231 of the center land portion 230 opens to the inclined groove 231 is in the range of 10% to 40% of the width W 230 of the center land portion 230.
  • the minimum distance ⁇ 2 from the edge opposite to the edge where the inclined groove 221 of the center land portion 220 is opened to the inclined groove 221 is set in the range of 10% to 40% of the width W 220 of the center land portion 220. Good. Thereby, drainage performance and partial abrasion resistance can be compatible.
  • a plurality of chamfered portions can be provided on the edge opposite to the side where the inclined grooves 221 and 231 are opened.
  • a chamfering part what has a shape similar to other embodiment is employable. By providing such a chamfer, the partial abrasion resistance can be improved.
  • a mounting direction of the front and back of the tire when the vehicle is mounted is designated, and having a tread pattern asymmetric on both sides of the tire equator, as shown in FIG.
  • a mounting direction of the front and back of the tire when the vehicle is mounted is designated, and having a tread pattern asymmetric on both sides of the tire equator, as shown in FIG.
  • the four main grooves extending in the tire circumferential direction are provided in the part, and the lands of five rows are partitioned by these main grooves, and the outer intermediate land part located on the vehicle outer side of the center land part is inclined with respect to the tire circumferential direction.
  • a plurality of first inclined grooves are provided, and a plurality of second inclined grooves inclined in the same direction as the first inclined grooves are provided in the center land portion located on the tire equator, and one end of each first inclined groove is The other end is terminated in the outer intermediate land portion while opening in the main groove located between the land portion and the outer intermediate land portion, and one end of each second inclined groove is between the center land portion and the outer intermediate land portion While opening to the main groove located The end is terminated in the center land portion, and a plurality of chamfered portions are provided on the vehicle outer edge of the outer intermediate land portion, and the average inclination angle ⁇ of the first inclined groove, the average inclination angle ⁇ of the second inclined groove, and the chamfered portion
  • the tires of Examples 11 to 17 were prepared in which the ratio of the maximum width Wmax to the width of the outer intermediate land portion and the ratio of the maximum depth Hmax of the chamfered portion to the effective depth of the main groove were set as shown in Table 2. For comparison, a pneumatic
  • the tire size is 205 / 55R16, and as shown in FIG. 7, the tread portion is provided with three main grooves extending in the circumferential direction of the tire, and these main grooves define four rows of land portions.
  • the center lands of one of the center lands are provided with a plurality of first inclined grooves inclined with respect to the tire circumferential direction.
  • a plurality of second inclined grooves inclined in the same direction as the first inclined groove are provided in the other center land portion, and one end of each first inclined groove is opened to the main groove located between the pair of center land portions The other end is terminated in one center land portion, and one end of each second inclined groove is opened to the main groove located between the pair of center land portions while the other end is terminated in the other center land portion, and the first inclination Average inclination angle ⁇ of grooves, Average inclination angle ⁇ of second inclined grooves
  • Table 3 The tires of Examples 21 to 24 were set as shown in Table 3.
  • a pneumatic tire (Conventional Example 3) is prepared in which sloped grooves are respectively provided in a pair of center land portions and one end of each sloped groove is opened in the main groove on the shoulder side and the other end is terminated in the land portion. did.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
PCT/JP2009/063552 2008-11-18 2009-07-30 空気入りタイヤ WO2010058627A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE112009001452.6T DE112009001452B4 (de) 2008-11-18 2009-07-30 Luftreifen
AU2009318659A AU2009318659B2 (en) 2008-11-18 2009-07-30 Pneumatic tire
RU2010144775/11A RU2468930C2 (ru) 2008-11-18 2009-07-30 Пневматическая шина
US12/995,203 US8162015B2 (en) 2008-11-18 2009-07-30 Pneumatic tire having asymmetrical tread pattern
JP2010511838A JP4548551B2 (ja) 2008-11-18 2009-07-30 空気入りタイヤ
CN200980118187.2A CN102036839B (zh) 2008-11-18 2009-07-30 充气轮胎

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008294945 2008-11-18
JP2008-294945 2008-11-18

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WO2010058627A1 true WO2010058627A1 (ja) 2010-05-27

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US (1) US8162015B2 (de)
JP (1) JP4548551B2 (de)
CN (1) CN102036839B (de)
AU (1) AU2009318659B2 (de)
DE (1) DE112009001452B4 (de)
RU (1) RU2468930C2 (de)
WO (1) WO2010058627A1 (de)

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JP2012206706A (ja) * 2011-03-11 2012-10-25 Yokohama Rubber Co Ltd:The 空気入りタイヤ
US10500902B2 (en) 2015-07-31 2019-12-10 The Yokohama Rubber Co., Ltd. Pneumatic tire

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JP5842885B2 (ja) * 2013-09-04 2016-01-13 横浜ゴム株式会社 空気入りタイヤ
USD798800S1 (en) * 2014-12-02 2017-10-03 The Goodyear Tire & Rubber Company Tire
JP6107843B2 (ja) * 2015-01-22 2017-04-05 横浜ゴム株式会社 空気入りタイヤ
WO2018165219A1 (en) * 2017-03-06 2018-09-13 Joy Mm Delaware, Inc. Drive shaft and sprockets for chain conveyor
WO2019151333A1 (ja) * 2018-01-30 2019-08-08 横浜ゴム株式会社 空気入りタイヤ
CA3146838A1 (en) 2021-01-28 2022-07-28 Joy Global Underground Mining Llc Chain conveyor and link for same

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US10500902B2 (en) 2015-07-31 2019-12-10 The Yokohama Rubber Co., Ltd. Pneumatic tire

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CN102036839B (zh) 2014-08-06
US20110067793A1 (en) 2011-03-24
US8162015B2 (en) 2012-04-24
DE112009001452B4 (de) 2015-05-28
JP4548551B2 (ja) 2010-09-22
JPWO2010058627A1 (ja) 2012-04-19
CN102036839A (zh) 2011-04-27
DE112009001452T5 (de) 2011-04-21
AU2009318659A1 (en) 2010-05-27
AU2009318659B2 (en) 2011-08-25
RU2468930C2 (ru) 2012-12-10

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