WO2016084985A1 - Bande de roulement de pneu pour améliorer l'efficacité d'une opération de montage - Google Patents

Bande de roulement de pneu pour améliorer l'efficacité d'une opération de montage Download PDF

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Publication number
WO2016084985A1
WO2016084985A1 PCT/JP2015/084085 JP2015084085W WO2016084985A1 WO 2016084985 A1 WO2016084985 A1 WO 2016084985A1 JP 2015084085 W JP2015084085 W JP 2015084085W WO 2016084985 A1 WO2016084985 A1 WO 2016084985A1
Authority
WO
WIPO (PCT)
Prior art keywords
tread
tire
indication
contact face
indications
Prior art date
Application number
PCT/JP2015/084085
Other languages
English (en)
Inventor
Masayoshi Nomura
Original Assignee
Compagnie Generale Des Etablissements Michelin
Michelin Recherche Et Technique S.A.
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 Compagnie Generale Des Etablissements Michelin, Michelin Recherche Et Technique S.A. filed Critical Compagnie Generale Des Etablissements Michelin
Publication of WO2016084985A1 publication Critical patent/WO2016084985A1/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

Definitions

  • the present invention relates to a tread for tire and in particular to a tread having an indication for indicating a correct mounting direction of tire onto a rim, and to a tire having such tread.
  • EP0667251A1 discloses a pneumatic tire in which markings for indicating the intended rotational direction are applied to a bottom surface of a circumferential groove on a tread.
  • some tires especially winter tires, have treated surface on an outermost surface of the tread.
  • the treated surface is provided in order to improve the performance of the tire during break-in period.
  • the treated surface is designed so as to be worn out when the break-in stage is completed. Therefore, it is important for the driver to recognize when the treated surface is worn-out. However, it is not easy to visually confirm whether the treated surface is worn out from the appearance. (0009) It is an object of the present invention to provide a tread for a tire having an indication for correct tire mounting direction, which indication can be easily provided on the tread and can indicate the completion of the break-in period, and to provide a tire having such tread.
  • a "groove” is a space between two rubber faces/sidewalls which do not contact between themselves under usual rolling condition connected by another rubber face/bottom.
  • a groove has a width and a depth.
  • An "incision” is a cut made on the contact face (tread surface) with a knife-like blade, and sometimes called as 'sipe'.
  • the width (or thickness) of such incision on the contact face is relatively thin (that is to say less than 2.0 mm) compared to a groove.
  • Two opposed rubber faces of such incision distant in a width (or thickness) direction may contact each other, at least partially and at least during passage of ground contact.
  • a "radial direction” is a direction perpendicular to an axis of rotation of a tire.
  • a “transverse direction” or an “axial direction” or an “axial orientation DA” is a direction parallel to a rotational axis of a tire.
  • a “rotational direction” or a “rotational direction DR” is a direction tangent to any circle centered on an axis of rotation of a tire. This direction is perpendicular to both the radial direction and the transverse direction.
  • a “surface treatment” is a processing made on contact face subjected for improving tire's performance at new (initial) state, as for example forming a plurality of fine grooves (or fine ribs) on the contact face as expressed in document JPH07-186633A, or forming a micro roughness made onto a mold for manufacturing a tire via, for example machining, electrolytic corrosion processing, etching, shot blasting etc. and such roughness being transferred to the contact face of the tire as expressed in document JPH07-257111A.
  • This surface treatment is usually made by molding a green (uncured) tire, but also applicable after vulcanization of such green tire via, for example hot stamping.
  • a “center region of the tread” is a central region when a tread is divided into three trisections in tire axial direction, that is to say a center region containing equatorial plane of the tread.
  • the invention provides a tread for a tire having a contact face intended to come into contact with ground, the contact face being provided with a surface treatment so as to have a treated surface for improving performance during break-in period and having at least one indication indicating at least one of a intended rotational direction DR and a axial orientation DA, the tread being characterized in that the indication is formed by being devoid of the surface treatment.
  • the indication can be applied easily onto the tread for tire by making an area which is devoid of the treated surface on the contact face of the tire, manufacturing efficiency of the tire increases.
  • the indication has a portion enable to encompass a circle with a diameter of at least 3 mm.
  • a total area of the indication on the tread with respect to the whole area of the contact face is at most equal to 5%.
  • the area of the indication relative to whole area of the contact face is preferably at most equal to 3%, and more preferably in a range between 0.01% and 2%.
  • the treated surface is formed by a plurality of fine grooves.
  • the treated surface has a roughness (Ra) of between 0.005mm and 0.02mm.
  • the indication is provided in an axially central region of the tread.
  • the indication can be recognized.
  • bordering can be made, for example by fine grooves, a protrusion, fine ribs, a plurality of strands (as expressed in document WO2007045425A1).
  • the bordering can be in a form of one continuous line or combination of several lines, dashed line, dotted line, double line, or combination of these lines.
  • the bordering is made by an incision.
  • incision serves as supplemental water storage capacity improving tire performance in particular on ice.
  • Depth of this incision is preferably less than 50% of depth of the groove in order not to impair rigidity around the indication.
  • FIG.1 is a schematic view of a tire having a tread according to first embodiment of the present invention
  • FIG.2 is an enlarged view of a portion indicated as II in Fig.1 ;
  • FIG.3 shows variants of the identification shown in Fig: 2;
  • FIG.4 is a schematic view of a tire having a tread according to a second embodiment of the present invention.
  • FIG.5 is a schematic view of a tread according to a third embodiment of the present invention.
  • FIG.1 is a schematic view of a tire section of a tire tread 1 of dimension 205/55R16.
  • Fig.2 shows a portion indicated as II in Fig.1.
  • the tread 1 is provided with one circumferential groove 3a and a plurality of axial grooves 3b.
  • the circumferential groove 3a extends in a circumferential direction along a tire rotational direction DR in an axially central region.
  • the axial grooves 3b extend generally in a tire axial orientation DA. Note that the internal construction of this tire other than the tread is the same structure as conventional pneumatic radial tire, thus description of the internal construction will be omitted.
  • the tread 1 has a contact face 2 intended to come into contact with the ground during rolling.
  • the contact face 2 includes a treated surface formed by a plurality of fine grooves 6 extending in an axial direction.
  • the sizes of the fine groove 6 are for example 0.005-1.5mm in depth (the radial direction), 0.01- 1.0mm in thickness and 0.1-2.0mm in pitch (distance between two adjacent fine grooves).
  • the indications 4 have an arrow-like shape which directs the intended rotational direction DR of the tire.
  • the indications 4 are positioned both sides of the circumferential groove 3a in staggered manner.
  • Each indications 4 has a size which contains a portion enable to encompass a circle 4a with a diameter of at least 3 mm.
  • the indications 4 are formed by being devoid of the fine grooves 6. That is, the surface of the indications 4 does not include fine grooves and is substantially flat or even. Thus, the surface of the indications 4 is different in reflection from the treated surface made of the fine grooves 6.
  • the indication 4 is formed by a substantially even surface so as to correspond to the indication provided on an inner surface of a mold used for molding the tire.
  • the indication 4 is provided in a center region of the tread 1 alternately across the groove 3 extending in the rotational direction DR by changing its shape symmetrically with respect to the groove 3 extending in the rotational direction
  • All the indications 4 on the contact face 2 are indicating the same tire rotational direction DR.
  • a total area of the indications 4 relative to the whole area of the contact face is at most equal to 5%, preferably at most equal to 3% and more preferably in a range between 0.01% and 2%.
  • Another indication 8 indicating the intended rotational direction of the tire is provided on the sidewall 7.
  • Another indication 8 includes an arrow-like marking and letters of "ROTATION".
  • the indication 4 has a portion enable to encompass a circle with a diameter of at least 3mm, visibility of the indication 4 can be improved. (0052) Since the indication 4 is positioned in the center region of the tread 1, the operator can easily find the indications 4, resulting that mounting operation will be improved.
  • the form and orientation of the fine grooves 6 is not limited to straight line extending in the tire axial direction.
  • the fine grooves can extend in the tire rotational direction or a direction oblique to the tire rotational direction in wavy, zig-zag and/or an arc manner. Combination of several types of the fine grooves can also be applicable.
  • the indication 4 is formed by a substantially even surface corresponding to the indication 4 provided on an inner surface of a mold used for molding the tire. Thus, efficiency for manufacturing such tire is enhanced and the manufacturing cost is reduced.
  • FIG.3 shows variants 4A-4C of the indication 4 shown in
  • an indication 4A is formed on the contact face 2A of the tread adjacent to a circumferential groove 3Aa.
  • the contact face 2A is a treated surface having roughness (Ra) of between 0.005mm and 0.02mm.
  • the roughness (Ra) can be obtained, for example, by manufacturing the tire by a mold on which inner surface treatment such as sandblasting had been given.
  • the roughness (Ra) of the surface of the indication 4 A is between 0.002mm and 0.003mm, which identical to that on a normal tire tread without surface treatment.
  • an indication 4B formed on a contact face 2B with fine grooves 6B has a triangle shape open to a circumferential groove 3Ba.
  • the indication 4B has a bordering 5B therearound.
  • a tip end of the triangle shape is directed substantially to the intended rotational direction of the present tire.
  • the indication 4B can indicate one direction similar to an arrow.
  • an indication 4C with a bordering 5C has a double sided allow shape.
  • the indication 4C is formed on a contact face 2C with the roughness (Ra).
  • Ra roughness
  • any other shape indicating an orientation can be used for an indication in the present invention.
  • the bordering 5C provides better visibility of the indication by emphasizing contours of the indication so as to improve the efficiency in mounting operation.
  • the bordering may also be made, for example by fine ribs, a protrusion, a plurality of strands as expressed in document WO2007045425A1.
  • the bordering can be formed so as to be seen as one continuous incision line or combination of several lines, dashed line, dotted line, double line or combination of these lines.
  • the indications 4, 4A, 4B, 4C can be provided after curing a tire having the plurality of fine grooves 6 onto the tread 1 or roughness, for example by a hot stamping.
  • Fig.4 is a schematic view of a tire having a tire tread 21 according to the second embodiment of the present invention.
  • the tread 21 has two circumferential grooves 23a, 23b extending in the tire rotational direction DR.
  • a contact face 22 of the tread 21 has roughness (Ra) of between 0.005mm and 0.02mm as a treated surface.
  • the roughness (Ra) is measured according to standard ISO 4287: 1997 and JIS B 0601.
  • This tread 21 has a specified (intended) inside-outside orientation in the tire axial orientation DA.
  • letters "OUTSIDE" 28 are placed in order to indicate intended mounting orientation of the tire in the axial direction.
  • a plurality of indications 24a, 24b is formed on the contact face 22.
  • the indications 24a, 24b are formed by being devoid of the treated surface (roughness).
  • indications have different shape, that is triangle shape 24a and an arrow-like shape 24b. Both of them are directing to the tire outside orientation along the tire axial orientation DA.
  • the indications 24a, 24b are positioned adjacent to the circumferential groove 23a on the outer side thereof.
  • the indications 24a, 24b have different shapes from each other and are alternately placed along the tire rotational direction DR.
  • a total area of the indications 24a, 24b relative to the whole area of the contact face, is at most equal to 5%, preferably at most equal to 3% and more preferably in a range between 2% and 0.01%.
  • Each indications 24a, 24b has a size which contains a portion enable to encompass a circle 24c with a diameter of at least 3mm.
  • 24a, 24b has a bordering 25 made by an incision.
  • the bordering 25 made by an incision can act as supplemental water storage to further improve tire performance in particular on ice.
  • the indications 24a, 24b can provide other information, for example timing for tire rotation. Depth of the incision is preferably less than 50% of a depth of the groove 23a for not impairing a rigidity around the indication 24a, 24b.
  • a plural pairs of indications 34a, 34b shown in Fig.5 (A) is provided on a contact face 32 (only one pair is shown in Fig.5 (A)).
  • the indications 34a, 34 are formed by being devoid of the roughness (Ra).
  • One indication 34a in Fig.5(A) has an arrow-like shape with single-sided arrow head provided without bordering and indicates the tire axial orientation DA.
  • Another indication 34b has an arrow-like shape with a double-sided arrow head including the bordering 35 of a continuous line and indicates the tire rotational direction DR.
  • a plural pairs of indications 44a, 44b shown in Fig.5 (B) is provided on a contact face 42 (only one pair is shown in Fig.5 (B)).
  • the indications 44a, 44b are formed by being devoid of the fine grooves 46 on a contact face 42.
  • One indication 44a indicates the tire axial orientation DA (left-right direction on Fig.5) and the another indication 44b indicates the tire rotational direction DR
  • the pair of the indications 44a, 44b in Fig.5(B) has an arrow-like shape with single-sided arrow head provided with bordering 45 shown by dotted lines.
  • the indication 44a, 44b can be applied also to a tread for a tire having both intended rotation direction and intended inside-outside orientation, providing increased mounting operation efficiency as described above.
  • the molding element of the present invention can be used not only for molding a pneumatic tire but also for molding a tread portion of non-pneumatic tire such as a solid tire or a tire with flexible spokes (such as a non-pneumatic tire known under the trade name "TWEEL" (registered trade mark)).
  • non-pneumatic tire such as a solid tire or a tire with flexible spokes (such as a non-pneumatic tire known under the trade name "TWEEL" (registered trade mark)).

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

Abstract

La présente invention concerne une bande de roulement (1) pour un pneu ayant une face de contact (2) destinée à venir en contact avec le sol, la face de contact (2) recevant un traitement de surface de façon à avoir une surface traitée pour améliorer les performances pendant une période de rodage et ayant au moins une indication (4) indiquant au moins l'une d'une direction de rotation prévue DR et une orientation axiale DA, la bande de roulement étant caractérisée en ce que l'indication (4) est formée en étant dépourvue du traitement de surface. Selon la présente invention, l'efficacité de montage de pneu est améliorée tandis qu'une reconnaissance aisée de l'achèvement du rodage de pneu peut être obtenue.
PCT/JP2015/084085 2014-11-28 2015-11-27 Bande de roulement de pneu pour améliorer l'efficacité d'une opération de montage WO2016084985A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014082344 2014-11-28
JPPCT/JP2014/082344 2014-11-28

Publications (1)

Publication Number Publication Date
WO2016084985A1 true WO2016084985A1 (fr) 2016-06-02

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Country Status (1)

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WO (1) WO2016084985A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110536806A (zh) * 2017-06-08 2019-12-03 横滨橡胶株式会社 充气轮胎
US11224787B2 (en) 2017-07-13 2022-01-18 Prgr Co., Ltd. Swing measurement device, swing measurement method, and swing measurement program

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63106108A (ja) * 1986-10-24 1988-05-11 Bridgestone Corp 空気入りタイヤ
JPH02149302U (fr) * 1989-05-24 1990-12-19
JPH0593909U (ja) * 1992-05-29 1993-12-21 住友ゴム工業株式会社 重荷重用空気入りタイヤ
JPH11208217A (ja) * 1998-01-21 1999-08-03 Ohtsu Tire & Rubber Co Ltd :The 空気入りラジアルタイヤ
JP2000255224A (ja) * 1999-03-10 2000-09-19 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2007290442A (ja) * 2006-04-21 2007-11-08 Bridgestone Corp タイヤ
US20100000649A1 (en) * 2006-12-04 2010-01-07 Bridgestone Corporation Tire
US20110083777A1 (en) * 2008-03-20 2011-04-14 Societe Technologie Michelin Tire Tread Design
US20130118660A1 (en) * 2010-05-31 2013-05-16 Didier Gay Moulding element comprising a plurality of ribs and at least one rib-free measurement zone
JP2014172484A (ja) * 2013-03-07 2014-09-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63106108A (ja) * 1986-10-24 1988-05-11 Bridgestone Corp 空気入りタイヤ
JPH02149302U (fr) * 1989-05-24 1990-12-19
JPH0593909U (ja) * 1992-05-29 1993-12-21 住友ゴム工業株式会社 重荷重用空気入りタイヤ
JPH11208217A (ja) * 1998-01-21 1999-08-03 Ohtsu Tire & Rubber Co Ltd :The 空気入りラジアルタイヤ
JP2000255224A (ja) * 1999-03-10 2000-09-19 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2007290442A (ja) * 2006-04-21 2007-11-08 Bridgestone Corp タイヤ
US20100000649A1 (en) * 2006-12-04 2010-01-07 Bridgestone Corporation Tire
US20110083777A1 (en) * 2008-03-20 2011-04-14 Societe Technologie Michelin Tire Tread Design
US20130118660A1 (en) * 2010-05-31 2013-05-16 Didier Gay Moulding element comprising a plurality of ribs and at least one rib-free measurement zone
JP2014172484A (ja) * 2013-03-07 2014-09-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110536806A (zh) * 2017-06-08 2019-12-03 横滨橡胶株式会社 充气轮胎
EP3636456A4 (fr) * 2017-06-08 2021-01-20 The Yokohama Rubber Co., Ltd. Pneu
US20210331526A1 (en) * 2017-06-08 2021-10-28 The Yokohama Rubber Co., Ltd. Pneumatic Tire
CN110536806B (zh) * 2017-06-08 2022-06-21 横滨橡胶株式会社 充气轮胎
US11897288B2 (en) 2017-06-08 2024-02-13 The Yokohama Rubber Co., Ltd. Pneumatic tire
US11224787B2 (en) 2017-07-13 2022-01-18 Prgr Co., Ltd. Swing measurement device, swing measurement method, and swing measurement program

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