WO2015136996A1 - Pneu - Google Patents

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Publication number
WO2015136996A1
WO2015136996A1 PCT/JP2015/052352 JP2015052352W WO2015136996A1 WO 2015136996 A1 WO2015136996 A1 WO 2015136996A1 JP 2015052352 W JP2015052352 W JP 2015052352W WO 2015136996 A1 WO2015136996 A1 WO 2015136996A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
tire
groove wall
protrusion
width direction
Prior art date
Application number
PCT/JP2015/052352
Other languages
English (en)
Japanese (ja)
Inventor
康典 阿部
Original Assignee
株式会社ブリヂストン
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 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2015136996A1 publication Critical patent/WO2015136996A1/fr

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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
    • B60C11/01—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
    • B60C11/13—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
    • B60C11/1323—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls asymmetric
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B60C2011/1338—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising protrusions

Definitions

  • the present invention relates to a tire that can improve shoulder uneven wear not only in the early stage of wear but also in the end stage of wear.
  • a technique in which a narrow groove called a defense side groove (hereinafter referred to as DSG) is provided at an end portion in the width direction of a tread portion in order to improve uneven wear properties of a tire shoulder portion.
  • DSG defense side groove
  • annular groove 13 ⁇ / b> A that extends continuously in the tire circumferential direction is provided on the groove bottom side of the groove wall 11 on the inner side in the tire width direction of the DSG 10 ⁇ / b> A provided in the shoulder land portion 5.
  • a technique for improving the tear resistance of the bottom and suppressing the occurrence of cracks has been proposed (see, for example, Patent Document 1).
  • the present invention has been made in view of the conventional problems, and provides a tire capable of improving the uneven shoulder wear from the beginning of travel to the end of travel by improving the uneven wear at the beginning of traveling. Objective.
  • the present invention relates to a plurality of circumferential grooves formed on the tread surface so as to extend along the tire circumferential direction, a circumferential groove provided on a tire width direction end side of the circumferential grooves, and a tread grounding.
  • a tire including a circumferential narrow groove (DSG) formed in a land portion between the ends and extending along a tire circumferential direction, wherein the circumferential narrow groove is a groove of the circumferential narrow groove
  • the groove width is provided on the bottom side and extends continuously in the tire circumferential direction, and the groove width is a groove wall located on the inner side in the tire width direction of the circumferential narrow groove and a groove wall located on the outer side in the tire width direction.
  • An annular groove wider than an interval with a certain outer groove wall (hereinafter referred to as a DSG groove width), and a protrusion that is provided on the outer groove wall and protrudes toward the inner groove wall and substantially continuous in the tire circumferential direction And the protrusion is provided only on the outer groove wall, and Characterized by contacting the groove wall.
  • the rigidity of the land portion on the outer side in the tire width direction of the DSG can be increased. Therefore, when the projection and the groove wall come into contact with each other, a force in the direction opposite to the brake direction can be efficiently generated, and thus the slip in the brake direction can be reliably suppressed.
  • the rigidity of the land part of a tire width direction outer side will become low if a projection part is provided in an inner side groove wall, the effect which suppresses the slip of a brake direction will fall.
  • FIG. 1 is a cross-sectional view of a main part (a cross-sectional view in the tire width direction) of a tire 1 according to the present embodiment, where CL in the figure is a tire equatorial plane.
  • CL in the figure is a tire equatorial plane.
  • 2 is a tread
  • 3a and 3b are circumferential grooves formed on the tread 2 on the tread surface side so as to extend along the tire circumferential direction.
  • the circumferential groove 3a located on the tire equatorial plane CL side is referred to as a main groove
  • the circumferential groove 3b located on the outer side in the tire width direction is referred to as a shoulder groove.
  • the central land portion 4 is defined by the main groove 3a and the shoulder groove 3b, and the shoulder land portion 5 is defined by the shoulder groove 3b.
  • a circumferential narrow groove (hereinafter referred to as DSG) 10 extending along the tire circumferential direction is formed between the tread grounding end TG of the shoulder land portion 5, and the shoulder land portion 5 serves as an inner shoulder by the DSG 10. It is divided into a land portion 5a and an outer shoulder land portion 5b.
  • FIG. 2 is an enlarged view of the DSG 10 in the tire width direction cross section.
  • the DSG 10 includes a linear inner groove wall 11 extending inward in the tire radial direction from the opening end 10i on the tire width direction inner side of the DSG 10, and an outer side in the tire width direction. From the linear outer groove wall 12 extending inward in the tire radial direction from the open end 10o, the annular groove 13 provided on the groove bottom 10d side and continuously extending in the tire circumferential direction, and the groove wall of the outer groove wall 12 And a protrusion 14 protruding toward the inner groove wall 11 side.
  • the height of the outer shoulder land portion 5b in the tire radial direction is formed to be lower than the height dimension of the inner shoulder land portion 5a by d, thereby promoting the wear of the outer shoulder land portion 5b.
  • the uneven wear of the shoulder land portion 5a is suppressed.
  • the annular groove 13 includes a groove side bottom portion 13m communicating with a groove portion (hereinafter referred to as an opening side groove portion) 15 surrounded by the inner groove wall 11 and the outer groove wall 12, and a tire width from the groove bottom 10d side of the inner groove wall 11.
  • a widened portion 13n that swells inward in the direction is provided.
  • the protrusion 14 is provided only on the groove wall of the outer groove wall 12.
  • the annular groove has a first circular arc portion having a curvature radius R1 of 1.0 to 12.0 mm, the center of curvature being on the inner side in the tire width direction of the inner groove wall, and one end connected to the inner groove wall.
  • the radius of curvature R2 provided between the terminal end of the first arc portion and the innermost end in the tire width direction of the annular groove is 1.5-4.
  • the tire width direction distance to the outer groove wall is 5.7 to 6.5 mm, and the angle ⁇ between the extending direction of the inner groove wall and the tread surface is 60 ° or more and less than 90 °. It is configured.
  • the above dimensions are values when a tire is mounted on an applicable rim and is in a specified internal pressure and no load unless otherwise specified.
  • four circular arc portions are provided in the annular groove, and the shape of the annular groove is made smooth, so that it is possible to improve the stone biting property and the groove bottom tear resistance and the groove bottom crack resistance. Can also be improved.
  • the first arc portion 16 connects the inner radial end of the inner groove wall 11 and the end of the annular groove 13 on the inner groove wall 11 side, and the center of curvature is the inner width of the inner groove wall 11 in the tire width direction.
  • the second arc portion 17 is an arc having a center of curvature in the annular groove 13 and a radius of curvature R2 of 1.5 to 4.0 mm. It is directed to the inner end 10c and constitutes a groove wall on the inner side in the tire width direction of the annular groove 13.
  • An end portion on the outer side in the tire radial direction, which is the starting end of the second arc portion 17, and an end portion on the inner side in the tire radial direction, which is the terminal end of the first arc portion 16, are connected by a smooth curve.
  • the third arc portion 18 is a third circular arc having a radius of curvature R3 of 1.0 to 16.0 mm with the center of curvature in the annular groove 13, and is annular from the innermost end 10c in the tire width direction of the annular groove 13. It is formed between the innermost end in the tire radial direction of the groove 13 and constitutes a groove wall on the inner side in the tire radial direction of the annular groove 13. An end portion on the inner side in the tire width direction which is the starting end of the third arc portion 18 and an end portion on the inner side in the tire radial direction which is the end portion of the second arc portion 17 are connected by a smooth curve.
  • the fourth arc portion 19 connects the end of the outer groove wall 12 on the inner side in the tire radial direction and the end of the annular groove 13 on the outer groove wall 12 side, and has a curvature radius R4 of 2.0 to 16.0 mm. Consists of arcs.
  • the end portion on the outer side in the direction and the end portion on the inner side in the tire radial direction of the outer groove wall 12 are connected by a smooth curve.
  • the groove width W of the opening side groove portion 15 is set to 1.0 to 5.0 mm, and the groove width of the annular groove 13 from the innermost end 10c in the tire width direction to the outer groove wall 12 is set.
  • the distance in the tire width direction is 5.7 to 6.5 mm (see FIG. 3). This is because if the groove width of the annular groove 13 is less than 5.7 mm, the effect of reducing the contact pressure by the annular groove 13 cannot be obtained, and shoulder uneven wear at the initial stage of wear cannot be suppressed. Further, if the groove width exceeds 6.5 mm, the width in the tire width direction of the outer shoulder land portion 5b becomes excessively small at the end of wear, and shoulder uneven wear is promoted.
  • the angle ⁇ formed between the extending direction of the inner groove wall 11 and the tread surface is 60 ° or more and less than 90 °.
  • ⁇ is less than 60 °, it is difficult for foreign matter to be discharged when foreign matter enters DSG 10, and cracks are likely to occur.
  • ⁇ is 90 ° or more, the tread rubber is less likely to bulge in the tire width direction, and it is difficult to suppress uneven shoulder wear.
  • the length of the inner groove wall in the tire radial direction is L
  • the end portion of the protrusion portion on the opening side of the circumferential narrow groove and the outer groove wall When the protrusion depth, which is the distance from the opening end, is H, the protrusion depth H satisfies the relationship 0 ⁇ H ⁇ L / 3.
  • the braking force in the tire circumferential direction acts on the land portion located on the outer side in the tire width direction of the DSG to suppress the wear on the land portion located on the inner side in the tire width direction of the DSG. Can be improved.
  • the protruding portion 14 includes a rising portion 14a that rises from the groove wall of the outer groove wall 12 toward the inner groove wall 11, a flat end portion 14b that includes a plane parallel to the outer groove wall 12, and an outer groove wall that falls from the flat end portion 14b. 12 and a falling portion 14c connected to the groove wall, and the flat end portion 14b contacts the inner groove wall 11 when loaded.
  • the end portion P on the opening end 10o side of the protrusion 14 is located on the inner side in the tire radial direction by a distance H from the surface of the outer shoulder land portion 5b.
  • the distance H is referred to as the protrusion depth.
  • the protrusion depth H is in the range of 0 ⁇ H ⁇ L / 3. This is because when the protrusion depth H exceeds 1 / 3L, the groove walls of the opening of the DSG come into contact with each other before the protrusion 14 contacts the inner groove wall at the time of load. This is because it is difficult to generate a force in the direction opposite to the force, and the effect of improving the uneven wear of the shoulder portion at the initial stage of traveling is reduced.
  • FIG.3 (b) it is good also considering the edge part P by the side of the opening end 10o of the projection part 14 as the same position as the opening end 10o.
  • the protrusion depth H is 1/3 L or less, it is possible to prevent the opening of the DSG 10 from coming into contact first during rolling of the load. Therefore, the braking force in the tire circumferential direction works on the land portion located on the outer side in the tire width direction of the DSG 10, and the wear on the land portion located on the inner side in the tire width direction of the DSG 10 is suppressed. Can be improved.
  • the tire tread when no load is applied is the inner shoulder surface. It becomes the land part 5a.
  • the protrusion depth H ′ viewed from the tire tread surface is in the range of d ⁇ H ′ ⁇ d + L / 3.
  • the length L of the inner groove wall 11 in the tire radial direction is preferably 6 to 10 mm. This is because, when L is too small, an annular groove having a wide groove width approaches the ground contact surface at an early stage of traveling, and a corner portion (indicated by reference numeral 16 in FIG. 2) having a low rigidity comes to ground. This is because the wear of the steel becomes faster. In addition, when L is too large, the annular groove is separated from the road surface, so that the action of reducing the contact pressure at the contact end is reduced in the initial traveling stage.
  • the protrusion depth H and the protrusion length K are L / 3 ⁇
  • the protrusion thickness which is the protrusion dimension of the protrusion from the outer groove wall
  • the protrusion thickness w is W It is configured to satisfy the relationship of / 3 ⁇ w ⁇ 2W / 3.
  • the protrusion thickness w which is a protruding dimension of the protrusion 14 from the outer groove wall 12, preferably satisfies the relationship W / 3 ⁇ w ⁇ 2W / 3. .
  • W is the groove width of the opening-side groove 15 as described above.
  • H + K is less than L / 3
  • the contact area between the protrusion 14 and the inner groove wall 11 is insufficient, and as a result, the force in the direction opposite to the brake direction becomes weak, and the effect of suppressing slippage in the brake direction is reduced. Because it does.
  • H + K exceeds L
  • the groove bottom 10d side of the protrusion 14 does not come into contact with the inner groove wall 11, so that the effect of providing the protrusion 14 cannot be obtained. Therefore, the sum H + K of the protrusion length K and the protrusion depth H is preferably in the range of L / 3 ⁇ H + K ⁇ L. Further, if the protrusion thickness w is less than W / 3, the DSG may not be closed when the load is small.
  • the protrusion depth H and the protrusion thickness w be in the range of W / 3 ⁇ w ⁇ 2W / 3.
  • the rising portion 14a and the falling portion 14c are provided to increase the rigidity of the protruding portion 14, and are not essential elements of the protruding portion 14. Therefore, as shown in FIGS. 3A and 3B, the rising portion 14a and the falling portion 14c may be omitted.
  • FIG. 4 is a diagram showing the effect of reducing the wear energy due to the provision of the protrusions.
  • the horizontal axis is the tread tire width direction position [mm]
  • the vertical axis is the wear energy [9.8 ⁇ 10 5 erg / cm 2 ]. is there.
  • the solid line in the figure is the wear energy of the tire of the present invention in which the projections are provided on the DSG shown in FIG. 2, and the broken line is the wear energy of a conventional tire having no projections on the DSG.
  • the tire size used in the test is 295 / 75R22.5, and the internal pressure is 690 kPa.
  • the wear energy is measured by measuring the force acting on the tire contact surface during rolling of the tire and the slip between the tire contact surface and the road surface, and the energy generated by friction from the product of the force and the slip (wear energy). ) was used, a known wear energy tester was used.
  • the present invention has an annular groove 13A that widens only on the inner groove wall 11 side, but the angle ⁇ formed between the extending direction of the inner groove wall 11 and the tread surface is 90 °.
  • the present invention is also applicable to the conventional DSG 10A.
  • the said embodiment demonstrated DSG10 which has the annular groove 13 provided with the widening part 13n swelled in the tire width direction inner side from the groove bottom side of the inner side groove wall 11, this invention is shown in FIG.5 (b).
  • the present invention is also applicable to a DSG 10B having an annular groove 13B having a widened portion on both the groove bottom side of the inner groove wall 11 and the groove bottom side of the outer groove wall 12 as shown.

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

Abstract

La présente invention concerne un pneu, dans lequel l'usure irrégulière d'un épaulement de la phase initiale d'utilisation à la phase finale d'utilisation peut être réduite par réduction de l'usure irrégulière dans la phase initiale d'utilisation. Une rainure étroite circonférentielle (10) formée dans une partie d'appui entre une rainure d'épaulement et une extrémité en contact avec le sol de la chaussée (TG) et s'étendant le long de la direction circonférentielle du pneu est pourvue : d'une rainure annulaire (13) qui est prévue sur le côté de la rainure étroite circonférentielle (10) orientée vers un fond de rainure (10d), s'étend de manière continue dans la direction circonférentielle du pneu, et a une largeur de rainure plus large que la distance entre une paroi de rainure intérieure (11) et une paroi de rainure extérieure (12) ; et d'une partie saillante (14) qui est prévue sur la paroi de rainure extérieure (12) et fait saillie vers la paroi de rainure intérieure (11). La partie saillante (14) entre en contact avec la paroi de rainure intérieure (11) sous une charge, et est sensiblement continue dans la direction circonférentielle du pneu.
PCT/JP2015/052352 2014-03-12 2015-01-28 Pneu WO2015136996A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014049104A JP2015171865A (ja) 2014-03-12 2014-03-12 タイヤ
JP2014-049104 2014-03-12

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Publication Number Publication Date
WO2015136996A1 true WO2015136996A1 (fr) 2015-09-17

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WO (1) WO2015136996A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180134095A1 (en) * 2016-11-11 2018-05-17 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
US20180134091A1 (en) * 2016-11-15 2018-05-17 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
US20180162176A1 (en) * 2016-12-14 2018-06-14 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
EP3560733A1 (fr) * 2018-04-26 2019-10-30 Hankook Tire Co., Ltd. Pneu pour prévenir l'usure irrégulière
CN111873718A (zh) * 2020-07-30 2020-11-03 江苏通用科技股份有限公司 一种胎肩阶梯式散热槽
CN114746286A (zh) * 2019-11-21 2022-07-12 大陆轮胎德国有限公司 商用车辆轮胎

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6754681B2 (ja) * 2016-11-25 2020-09-16 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPH037604A (ja) * 1989-06-05 1991-01-14 Ohtsu Tire & Rubber Co Ltd :The 重荷重用空気入りタイヤ
JP2001260612A (ja) * 2000-03-21 2001-09-26 Bridgestone Corp 重荷重用空気入りタイヤ
JP2002019420A (ja) * 2000-07-04 2002-01-23 Bridgestone Corp 空気入りタイヤ
JP2003048408A (ja) * 2001-08-07 2003-02-18 Bridgestone Corp 空気入りタイヤ
WO2008111582A1 (fr) * 2007-03-13 2008-09-18 Bridgestone Corporation Pneu
JP2012162135A (ja) * 2011-02-04 2012-08-30 Bridgestone Corp 空気入りタイヤ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH037604A (ja) * 1989-06-05 1991-01-14 Ohtsu Tire & Rubber Co Ltd :The 重荷重用空気入りタイヤ
JP2001260612A (ja) * 2000-03-21 2001-09-26 Bridgestone Corp 重荷重用空気入りタイヤ
JP2002019420A (ja) * 2000-07-04 2002-01-23 Bridgestone Corp 空気入りタイヤ
JP2003048408A (ja) * 2001-08-07 2003-02-18 Bridgestone Corp 空気入りタイヤ
WO2008111582A1 (fr) * 2007-03-13 2008-09-18 Bridgestone Corporation Pneu
JP2012162135A (ja) * 2011-02-04 2012-08-30 Bridgestone Corp 空気入りタイヤ

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108068557B (zh) * 2016-11-11 2020-01-10 东洋橡胶工业株式会社 充气轮胎
CN108068557A (zh) * 2016-11-11 2018-05-25 东洋橡胶工业株式会社 充气轮胎
US10639938B2 (en) 2016-11-11 2020-05-05 Toyo Tire Corporation Pneumatic tire
US20180134095A1 (en) * 2016-11-11 2018-05-17 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
US20180134091A1 (en) * 2016-11-15 2018-05-17 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
JP2018079767A (ja) * 2016-11-15 2018-05-24 東洋ゴム工業株式会社 空気入りタイヤ
US20180162176A1 (en) * 2016-12-14 2018-06-14 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
CN110406325A (zh) * 2018-04-26 2019-11-05 韩国轮胎株式会社 防止不规则磨损的轮胎
EP3560733A1 (fr) * 2018-04-26 2019-10-30 Hankook Tire Co., Ltd. Pneu pour prévenir l'usure irrégulière
CN110406325B (zh) * 2018-04-26 2022-02-11 韩国轮胎株式会社 防止不规则磨损的轮胎
CN114746286A (zh) * 2019-11-21 2022-07-12 大陆轮胎德国有限公司 商用车辆轮胎
CN114746286B (zh) * 2019-11-21 2023-11-21 大陆轮胎德国有限公司 商用车辆轮胎
CN111873718A (zh) * 2020-07-30 2020-11-03 江苏通用科技股份有限公司 一种胎肩阶梯式散热槽

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