WO2004028836A1 - Pneumatique - Google Patents

Pneumatique Download PDF

Info

Publication number
WO2004028836A1
WO2004028836A1 PCT/JP2003/012317 JP0312317W WO2004028836A1 WO 2004028836 A1 WO2004028836 A1 WO 2004028836A1 JP 0312317 W JP0312317 W JP 0312317W WO 2004028836 A1 WO2004028836 A1 WO 2004028836A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
outer contour
tread
width direction
contour line
Prior art date
Application number
PCT/JP2003/012317
Other languages
English (en)
Japanese (ja)
Inventor
Yasufumi Ichiki
Hideki Matuda
Masahiro Yabashi
Kenichirou Irimiya
Original Assignee
Bridgestone Corporation
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 Bridgestone Corporation filed Critical Bridgestone Corporation
Publication of WO2004028836A1 publication Critical patent/WO2004028836A1/fr

Links

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
    • B60C11/0083—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the curvature of the tyre 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
    • 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
    • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
    • 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
    • B60C11/0327—Tread patterns characterised by special properties of the tread pattern
    • B60C11/0332—Tread patterns characterised by special properties of the tread pattern by the footprint-ground contacting area of the tyre 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
    • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
    • B60C2011/013—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered provided with a recessed portion

Definitions

  • the present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire having improved drainage while suppressing uneven wear.
  • BACKGROUND ART In pneumatic tires for heavy loads used in vehicles such as trucks and buses, there is a problem that uneven wear is apt to occur on the shoulder side mating portion.
  • a proposal has been made in which a narrow groove extending in the direction is provided and the tread surface is formed by a plurality of arcs.
  • a narrow groove called a defense groove is formed on the shoulder side of the tread, and the narrow groove is formed inside the narrow groove in the tire width direction.
  • the tread surface of the tread is formed by separate arcuate curved surfaces.
  • These narrow grooves are provided to suppress the development of uneven wear (one-sided wear) inward in the tire width direction.
  • the ground contact shape increases the ground contact length at the tread end (see Fig. 3 in the official gazette), and suppresses the occurrence of uneven wear due to drag near the shoulder. ing.
  • a narrow groove to suppress the progress of uneven wear has a smaller groove cross-sectional area than a circumferentially large groove for drainage function, so drainage action cannot be expected. Therefore, it is conceivable to increase the width of the narrow grooves to provide drainage.However, if a wide circumferential groove with a large groove width is provided near the shoulder, the large circumferential groove widens when a load acts and the shoulder side Is deformed so that the land portion of the vehicle falls outward in the tire width direction. If the land on the shoulder side is deformed to fall outward in the tire width direction, the tread end is displaced inward in the tire radial direction, so that the contact length at the contact end becomes short, and there is a problem that uneven wear control effect cannot be obtained. .
  • An object of the present invention is to provide a pneumatic tire suitable for trucks, buses, and the like that can improve drainage while suppressing uneven wear in consideration of the above facts.
  • the pneumatic tire of the invention according to claim 1 has a plurality of circumferentially extending thick grooves having a groove width of 1 Omm or more and extending along the tire circumferential direction.
  • the tread has a plurality of land parts extending along it, and the outer contour of the tread when viewed in cross section along the tire rotation axis is provided on the tire equatorial plane side, has a center of curvature inside the tire, and has a radius of R1.
  • a second outer contour line wherein an intersection of the first outer contour line and the second outer contour line is located in the circumferentially wide groove on the outermost side in the tire width direction; From the apex of the contour line on the tire equatorial plane to the tire width direction outward in the tire radial direction On an imaginary perpendicular line extending in the vertical direction, H is a point separated by a distance from the tire equatorial plane to the tread edge, H 1 is a tire radial distance from the point H to the tread edge, and H 1 is a distance from the point H to the first.
  • the pneumatic tire of the invention according to claim 1 has a plurality of thick circumferential grooves extending along the tire circumferential direction having a groove width set to 1 Omm or more in the tread, so that high drainage performance is achieved. can get. If the width of the circumferential large groove is less than 1 Omm, high drainage performance cannot be obtained.
  • the outer contour of the tread when viewed in a cross section along the tire rotation axis is A first arcuate outer contour line provided on the equatorial plane side, having a center of curvature inside the tire and having a radius of R1, and a first outer contour line provided outside the first arc portion in the tire width direction.
  • the tire has a second outer contour line located outside the virtual first outer contour line, which is an extension line, in the tire radial direction, and the intersection of the first outer contour line and the second outer contour line is the outermost in the tire width direction.
  • the grounding shape is such that the grounding length decreases once from the center in the tire width direction toward the outside in the tire width direction, and then gradually touches down to the edge of the tread. Length increases.
  • outer circumferential wide groove at the outermost side in the tire width direction provided at the intersection of the first outer contour line and the second outer contour line can suppress the development of one-sided wear inward in the tire width direction.
  • tire life can be prolonged in a market where the side force acts on a lot of driving.
  • the pneumatic tire of the present invention has an excellent effect that it can improve drainage while suppressing uneven wear.
  • the invention according to claim 2 is the pneumatic tire according to claim 1, wherein a distance in a tire width direction from a tire equatorial plane to a tread edge is W, the first outer contour line and the second outer contour from the tire equatorial plane.
  • W a distance in a tire width direction from a tire equatorial plane to a tread edge
  • the entire outermost land portion in the tire width direction tends to be unevenly worn in a tapered shape.
  • the entire outermost land portion in the tire width direction is likely to be worn step-down due to dragging.
  • the distance W in the tire width direction from the tire equatorial plane to the tread edge is a so-called ground contact width of 1 Z 2.
  • the “contact width” refers to the contact width described in the FY2012 version of JATMAYAEARBBOOK. If the T R T standard or the ETR T0 standard is applied at the place of use or the place of manufacture, follow the respective standards.
  • the invention according to claim 3 is the pneumatic tire according to claim 1 or 2, characterized in that the second outer contour has an arc shape convex outward in the tire radial direction.
  • the second outer contour line has an arc shape that protrudes outward in the tire radial direction, the outermost land portion in the tire width direction has high uneven wear resistance against abrasion input from the side due to the slip angle, Wavy wear due to lateral input is unlikely to occur.
  • the invention of claim 4 provides the pneumatic tire according to claim 1 or claim 2.
  • the second outer contour has an arc shape convex inward in the tire radial direction.
  • the second outer contour has an arc shape that protrudes inward in the tire radial direction, it is excellent in uneven wear resistance due to dragging of the outermost end of the land portion (inside and outside) in the tire width direction.
  • the invention described in (1) is the pneumatic tire according to (1) or (2), wherein the second outer contour is a straight line.
  • the second outer contour line is a straight line
  • the outermost land portion in the tire width direction has a certain degree of uneven wear resistance against a lateral wear input due to the slip angle
  • the land portion has an edge. Partial uneven wear resistance can be obtained even when dragging the part (both inside and outside).
  • the invention according to claim 6 is the pneumatic tire according to any one of claims 1 to 5, wherein at the bottom of the circumferentially wide groove on the outermost side in the tire width direction, the position of the top is a tread. And an uneven wear sacrifice projection is provided so that the top portion contacts the road surface at the time of touchdown.
  • FIG. 1 is a sectional view showing a tread of a pneumatic tire according to one embodiment of the present invention.
  • FIG. 2 shows a grounded shape of the pneumatic tire according to one embodiment of the present invention.
  • FIG. 3 is a sectional view showing a tread of a pneumatic tire according to another embodiment of the present invention.
  • FIG. 1 is a table showing the test results of wear and drainage. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIGS. 1 and 2 One embodiment of the pneumatic tire of the present invention will be described with reference to FIGS. 1 and 2.
  • the tread 12 of the pneumatic radial tire 10 is provided with a tire equatorial plane CL in the tire width direction (arrow (A direction)
  • a first circumferentially thick groove 14 extending along the tire circumferential direction is provided, and outside the first circumferentially thick groove 14 in the tire direction, a first circumferentially thick groove 14 extending along the tire circumferential direction is provided.
  • Two circumferential thick grooves 16 are provided.
  • the groove width of the first circumferential large groove 14 and the second circumferential thick groove 16 be in the range of 10 to 18 mm in order to ensure drainage.
  • the outer contour (tread) of the tread 12 has a first outer contour 12A on the tire equatorial plane CL side and a second contour 12B on the shoulder side.
  • the first outer contour line 12A has an arc shape with a radius of curvature R1 having a center of curvature on the tire equatorial plane CL inside the tire.
  • the second outer contour line 12B has an arc shape with a radius of curvature R2 having a center of curvature inside the tire.
  • the second outer contour line 12B is located radially outward of the virtual first outer contour line 12AF, which extends the first outer contour line 12A outward in the tire width direction.
  • the intersection Q between the first outer contour 12A and the second outer contour 12B is located in the second circumferentially thick groove 16.
  • the tire width direction inner end 18 IE of the tread surface of the outermost land portion 18 in the tire width direction is located outside the virtual first outer contour line 12AF in the tire width direction.
  • the tread end 1 2 from the tire equatorial plane CL Let H be the point away from E, H1 be the radial distance from point H to tread edge 12E, and H2 be the radial distance from point H to the virtual first outer contour 12 AF. It is necessary to satisfy 0.35 ⁇ H1 / H2 ⁇ 0.65.
  • the distance in the tire width direction from the tire equatorial plane to the tread edge 12E is W (1/2 of the contact width), and the distance in the tire width direction from the tire equatorial plane CL to the intersection Q is
  • S it is preferable to satisfy 0.40 ⁇ S / W ⁇ 0.70.
  • the grounding shape 26 of the pneumatic tire 10 is changed from the center in the tire width direction (arrow A direction) to both ends in the tire width direction as shown in FIG.
  • the contact length once decreases toward the tire side, and then increases again toward both ends in the tire width direction.
  • the second circumferentially thick groove 16 is provided near the shoulder. Also, the position of the tread end 12E (tire radial direction) at the time of contact with the ground is maintained at the optimum position, and it is possible to prevent the contact length at the tread end 12E from becoming short. For this reason, the drag at the tread edge 12E is greatly reduced, and the occurrence of uneven wear can be delayed.
  • the provision of the second circumferential large groove 16 at the intersection Q between the first outer contour line 12A and the second outer contour line 12B reduces the development of one-sided wear in the second circumferential direction. It is stopped at the thick groove 16 in the direction, and the development of one-sided wear to the inside in the tire width direction can be further delayed.
  • the second outer contour line 12B is formed in an arc shape that protrudes outward in the tire radial direction, so that it has high partial wear resistance against a lateral wear input due to a slip angle, Wavy wear caused by lateral input is less likely to occur.
  • the entire outermost land portion 18 in the tire width direction tends to be unevenly worn in a tapered shape.
  • the second outer contour line 12B has an arc shape convex outward in the tire radial direction, but the second outer contour line 12B has an arc shape convex outward in the tire radial direction. Or a linear shape.
  • the second outer contour line 1 2B has an arc shape that protrudes inward in the tire radial direction, uneven wear resistance due to dragging of the end portion (both inside and outside) of the outermost land portion 18 in the tire width direction is obtained. Excellent.
  • the outermost land portion 18 in the width direction has a certain degree of uneven wear resistance against lateral wear input due to the slip angle, and However, a certain degree of uneven wear resistance can be obtained even when dragging the ends (both inside and outside) of the land 18.
  • the position of the top is set lower than the tread at the bottom of the second circumferentially thick groove 16 on the outermost side in the tire width direction, and the top is in contact with the road surface at the time of touchdown.
  • a wear sacrificial projection 20 may be provided.
  • the uneven wear sacrifice protrusion 20 is formed. It is dragged and worn on the road surface, and uneven wear of the land portion adjacent to the uneven wear sacrificial projection 20 can be further suppressed.
  • a conventional tire, a comparative tire, and a tire according to an example to which the present invention was applied were prepared, and the wear amount and drainage were compared.
  • test tires were mounted on a real vehicle (single truck, gross weight 30 ton, 6 x 2, 70% loaded), and the braking distance was measured when fully braking from a speed of 30 km / h on a concrete straight road at a depth of 2 nm. The measurement was performed three times for one type of tire, and the average value was obtained. The evaluation was expressed by an index with the reciprocal of the braking distance (average value) of the conventional example being 100. The larger the index value, the better the drainage performance.
  • the test results are as shown in the table of FIG. 4, and it can be seen that the dinner of the example to which the present invention is applied has a small amount of wear and is excellent in drainage.
  • the pneumatic tire according to the present invention is suitable for use in a vehicle.
  • a pneumatic tire such as a truck or a bus which needs to suppress uneven wear and improve drainage performance is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

L'invention concerne un pneumatique ayant une capacité de drainage supérieure et permettant d'éviter une usure irrégulière. Ce pneumatique comprend une première rainure circonférentielle profonde (14) et une seconde rainure circonférentielle profonde (16) formées dans la bande de roulement (12) du pneumatique, pour le drainage. Le pneumatique comprend également une seconde ligne de profil externe (12B), située sur le côté externe radial du pneumatique d'une première ligne de profil externe virtuelle (12AF), l'intersection (Q) entre la première ligne de profil externe (12A) et la seconde ligne de profil externe (12B) étant située dans la seconde rainure circonférentielle profonde (16). Une extrémité intérieure latérale du pneu (18IE) sur la bande de roulement de la partie en contact avec le sol (18), de l'extrémité extérieure latérale du pneu, est située sur le bord extérieur latéral du pneu de la première ligne de profil externe virtuelle (12AF), et le rapport d'une distance (H1) à une distance (H2) est de 0,35 ≤ S/W ≤0,70. Du fait que la longueur de contact au sol à l'extrémité de la bande de roulement est supérieure, la résistance au roulement peut être sensiblement réduite, ce qui permet de retarder l'apparition d'une usure irrégulière du pneumatique et de la stopper au niveau de la seconde rainure circonférentielle profonde (16).
PCT/JP2003/012317 2002-09-26 2003-09-26 Pneumatique WO2004028836A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-280655 2002-09-26
JP2002280655 2002-09-26

Publications (1)

Publication Number Publication Date
WO2004028836A1 true WO2004028836A1 (fr) 2004-04-08

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Country Status (1)

Country Link
WO (1) WO2004028836A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100584644C (zh) * 2006-08-28 2010-01-27 住友橡胶工业株式会社 载重轮胎
WO2010058857A1 (fr) * 2008-11-21 2010-05-27 横浜ゴム株式会社 Bandage pneumatique pour roue de véhicule
CN103974837A (zh) * 2011-11-29 2014-08-06 住友橡胶工业株式会社 重载轮胎

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62295702A (ja) * 1986-06-14 1987-12-23 Sumitomo Rubber Ind Ltd 偏摩耗性能を改善したスチ−ルラジアルタイヤ
JPH03235701A (ja) * 1990-02-08 1991-10-21 Bridgestone Corp 重荷重用空気入りタイヤ
JPH07164824A (ja) * 1993-12-17 1995-06-27 Toyo Tire & Rubber Co Ltd 重荷重用空気入りタイヤ
JPH082210A (ja) * 1994-06-22 1996-01-09 Toyo Tire & Rubber Co Ltd 重荷重用空気入りラジアルタイヤ
WO1997007996A1 (fr) * 1995-08-28 1997-03-06 The Goodyear Tire & Rubber Company Pneumatique de camion a faible rapport d'aspect
US5660652A (en) * 1995-07-14 1997-08-26 The Goodyear Tire & Rubber Company Truck tire and tread for steer axles
JPH10315712A (ja) * 1997-05-16 1998-12-02 Sumitomo Rubber Ind Ltd 重荷重用ラジアルタイヤ
JPH11245622A (ja) * 1998-03-04 1999-09-14 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2001301425A (ja) * 2000-04-24 2001-10-31 Bridgestone Corp 空気入りタイヤ
WO2003035413A1 (fr) * 2001-10-19 2003-05-01 Sumitomo Rubber Industries, Ltd. Pneu

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62295702A (ja) * 1986-06-14 1987-12-23 Sumitomo Rubber Ind Ltd 偏摩耗性能を改善したスチ−ルラジアルタイヤ
JPH03235701A (ja) * 1990-02-08 1991-10-21 Bridgestone Corp 重荷重用空気入りタイヤ
JPH07164824A (ja) * 1993-12-17 1995-06-27 Toyo Tire & Rubber Co Ltd 重荷重用空気入りタイヤ
JPH082210A (ja) * 1994-06-22 1996-01-09 Toyo Tire & Rubber Co Ltd 重荷重用空気入りラジアルタイヤ
US5660652A (en) * 1995-07-14 1997-08-26 The Goodyear Tire & Rubber Company Truck tire and tread for steer axles
WO1997007996A1 (fr) * 1995-08-28 1997-03-06 The Goodyear Tire & Rubber Company Pneumatique de camion a faible rapport d'aspect
JPH10315712A (ja) * 1997-05-16 1998-12-02 Sumitomo Rubber Ind Ltd 重荷重用ラジアルタイヤ
JPH11245622A (ja) * 1998-03-04 1999-09-14 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2001301425A (ja) * 2000-04-24 2001-10-31 Bridgestone Corp 空気入りタイヤ
WO2003035413A1 (fr) * 2001-10-19 2003-05-01 Sumitomo Rubber Industries, Ltd. Pneu

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100584644C (zh) * 2006-08-28 2010-01-27 住友橡胶工业株式会社 载重轮胎
WO2010058857A1 (fr) * 2008-11-21 2010-05-27 横浜ゴム株式会社 Bandage pneumatique pour roue de véhicule
JP2010149842A (ja) * 2008-11-21 2010-07-08 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP4553064B2 (ja) * 2008-11-21 2010-09-29 横浜ゴム株式会社 空気入りタイヤ
US9352618B2 (en) 2008-11-21 2016-05-31 The Yokohama Rubber Co., Ltd. Pneumatic tire with tread having five ribs and four circumferential grooves
CN103974837A (zh) * 2011-11-29 2014-08-06 住友橡胶工业株式会社 重载轮胎
US20140332133A1 (en) * 2011-11-29 2014-11-13 Sumitomo Rubber Industries, Ltd. Heavy duty tire
EP2774781A4 (fr) * 2011-11-29 2015-07-29 Sumitomo Rubber Ind Pneumatique pour chargement lourd
CN103974837B (zh) * 2011-11-29 2017-03-29 住友橡胶工业株式会社 重载轮胎
US9770950B2 (en) 2011-11-29 2017-09-26 Sumitomo Rubber Industries Ltd. Heavy duty tire
KR101923761B1 (ko) 2011-11-29 2018-11-29 스미토모 고무 고교 가부시키가이샤 중하중용 타이어

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