EP3898283A1 - Bande de roulement de pneu pour poids lourd ayant des incisions ameliorees - Google Patents
Bande de roulement de pneu pour poids lourd ayant des incisions amelioreesInfo
- Publication number
- EP3898283A1 EP3898283A1 EP19842826.0A EP19842826A EP3898283A1 EP 3898283 A1 EP3898283 A1 EP 3898283A1 EP 19842826 A EP19842826 A EP 19842826A EP 3898283 A1 EP3898283 A1 EP 3898283A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- incision
- tread
- optimized
- parts
- wide
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
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
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1272—Width of the sipe
- B60C11/1281—Width of the sipe different within the same sipe, i.e. enlarged width portion at sipe bottom or along its length
-
- 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
-
- 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
- B60C11/032—Patterns comprising isolated recesses
- B60C11/0323—Patterns comprising isolated recesses tread comprising channels under the tread surface, e.g. for draining water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C11/1218—Three-dimensional shape with regard to depth and extending direction
-
- 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
-
- 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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
Definitions
- the invention relates to the treads for heavy goods vehicle tires and more particularly to the treads provided with incisions by which the rolling performance is improved.
- the tread of a tire designates the part of the tire intended to come into contact with the roadway via a tread surface. This tread gradually wears out during the rolling of the tire.
- cutting we mean any cavity or hollow made in particular by molding in a tire tread, a cut extending both in the depth of the tread and in a main direction - that we may take the direction of water flow in the cutout when driving in rainy weather.
- This main direction corresponds to the largest dimension of the cutout on the running surface
- groove open to nine means a cut open on the running surface of a new tread, this groove being delimited by opposite walls, the average distance between these walls being appropriate so that these walls are not in contact with each other under normal conditions of use of the tire.
- incision is meant a thin cut having a small average width, this average width, corresponding to the average distance separating the facing walls delimiting it, being such that, under normal conditions of use of the tire, these walls are, at least partially, in contact with one another when passing through the region of contact of the tire with the roadway.
- An incision has a main direction, corresponding to the direction of flow of water in the incision, during driving in rainy weather, and a mean plane, defined by the main direction of the incision and the direction the thickness of the tread, therefore parallel to the walls of the incision.
- hidden cavity means a cavity formed under the new rolling surface of the tread, this cavity may be intended to form a new groove open on the new rolling surface generated after a predetermined partial wear.
- a hidden cavity is delimited by two side walls facing each other, these two side walls being interconnected by a lower part forming a bottom and by an upper part in the extension of these walls radially towards the outside. In this upper part, an incision can be opened to connect the hidden cavity to the new rolling surface. Seen in section, a hidden cavity can take any geometric shape, in particular circular, rectangular, triangular.
- radial or radially are used to indicate a direction which, when taken on the tire, is a direction perpendicular to the axis of rotation of the tire. This same direction, when taken on a tread alone, corresponds to the direction of the thickness of said tread.
- circumferential is used to indicate a direction which corresponds to a direction tangent to any circle centered on the axis of rotation of the tire. This circumferential direction corresponds to the longitudinal direction of the tread when the latter is produced in the form of a flat strip before its incorporation in the manufacture of a new tire or the retreading of a worn tire.
- transverse or axial refers to a direction which is parallel to the direction of the axis of rotation of the tire. This direction is perpendicular to the radial direction and to the circumferential direction. A direction is said to be oblique when it forms a non-zero angle with the circumferential or longitudinal direction on a tread.
- incisions having a variable width.
- Such incisions include narrow parts and wider parts.
- the narrow parts are capable of closing during the passage in contact with the roadway, the walls facing these parts coming into contact with one another over almost their entire surface.
- the wide parts are intended to ensure limited drainage of the water present on the contact surface with the road. The water thus captured in the wide parts is either evacuated to other cavities connected to these wide parts or is evacuated by centrifugation outside the region of contact with the roadway.
- the document published under the reference WO 2016/054278-A1 describes an incision having narrow parts, each narrow part being surrounded by wide parts, the shape of each narrow part being generally rectangular.
- the wide parts have a width at least equal to 0.4 mm (from 0.4 to 1.9 mm) and the narrow parts a width less than 0.4 mm (preferably 0.2 mm or 0.1 mm).
- treads have been developed having part of its recesses open new on the tread surface and another formed by cavities hidden inside the tread and forming channels.
- Each hidden cavity can be extended by an incision up to the new rolling surface, thus facilitating the molding and demolding of the tread.
- incisions transverse to the channels can be formed in addition to obtain satisfactory performance, in particular in traction and braking.
- the document EP 2323858-B1 describes such a tire tread for heavy goods vehicles.
- the present invention relates to an improvement in the mechanical operation of the incisions which is provided with a tire tread for heavy goods vehicles, these incisions having narrow parts and large parts, these parts being arranged in a new way.
- the invention relates to a tread for a truck tire comprising a new rolling surface intended to come into contact with a roadway during the rolling of a tire provided with this strip.
- This rolling surface is continuously renewed with the wear generated by driving on the road.
- This tread comprises a plurality of optimized incisions each having a main direction and a mean plane, defined by the main direction of the incision and the direction of the thickness of the tread, and opening on its new rolling surface, each optimized incision comprising two facing walls, intended to come into contact with one another when the rolling surface passes in the region of contact of the tire with the roadway, and being composed of at least two parts narrow and wide parts, each narrow part being surrounded by large parts extending in the main direction of the optimized incision.
- the sum of the areas of the narrow parts represents at least 40% of the total area of the optimized incision, measured in the mean plane of the optimized incision, (that is to say the area of one of the walls delimiting the optimized incision, projected in the mean plane of the optimized incision) and the width of each of these parts is less than 0.4 mm.
- Each wide part has a width at least equal to 0.4 mm. Said widths of narrow parts and wide parts are measured perpendicular to the mean plane of the optimized incision in the new rolling surface,
- each of the wide parts extending between two narrow parts comprises at least one section inclined in a plane parallel to the mean plane of the optimized incision and making a non-zero angle with the direction of the strip thickness.
- each wide part or section of wide part makes, in a plane parallel to the mean plane of the optimized incision, an angle at least equal to 15 degrees with the direction of the thickness of the strip.
- each inclined section of wide part between two narrow parts represents at least 30% of the total length of the wide part measured in a plane parallel to the mean plane of the optimized incision, between the rolling surface to new and the bottom of the optimized incision.
- the narrow parts of the optimized incisions have triangular geometries, the wide parts formed between two parts. narrow having an orientation making, in a plane parallel to the mean plane of the optimized incision, an angle at least equal to 15 degrees with the radial direction when the strip equips a tire (i.e. the direction of the tread thickness).
- a plurality of wide parts of an incision are formed with at least two inclined sections with different orientations, at least one of these orientations forming, in a parallel plane at the mid plane of the optimized incision, an angle at least equal to 15 degrees with the direction of the thickness of the tread.
- the average angle of the wide parts or inclined sections of wide parts relative to the direction of the thickness of the tread is preferably at least equal to 40 degrees.
- the difference in width between the narrow part and the wide part is at least equal to 0.2 mm or even more advantageously at least equal to 0.4 mm.
- these longitudinal incisions can advantageously be optimized incisions and comprising narrow parts and wide parts as described above.
- the transverse or oblique incisions are advantageously made up of parts narrow and wide parts, the wide parts along the longitudinal incision and the hidden channel following as closely as possible the geometry of this longitudinal incision and this hidden channel.
- the main direction of the hidden channel corresponds to the direction of the length of the hidden channel in which a flow of water occurs when driving on a pavement coated with water. This main direction is here longitudinal.
- this tread comprising a plurality of optimized incisions cutting the hidden channel and the incision extending it to the running surface, each optimized incision comprising narrow parts and wide parts surrounding the narrow parts, the wide part skirting the longitudinal incision and the hidden channel follows more closely the geometry of this longitudinal incision and this hidden channel.
- the longitudinal incision extending the hidden channel comprises a plurality of narrow parts of width less than 0.4 mm, each narrow part being surrounded by wide parts of width at least equal to 0.4 mm, each of the wide parts extending between two narrow parts comprising at least one section inclined in a plane parallel to the mean plane of the optimized incision, at an angle other than zero degrees with the direction of the thickness of the strip of rolling.
- each wide part or section of wide part forms, in a plane parallel to the mean plane of the optimized incision, an angle at least equal at 15 degrees with the direction of the thickness of the tread.
- the invention also relates to a tire provided with a tread comprising a plurality of optimized incisions constituted by narrow parts and wide parts surrounding the thinned parts as described above.
- Figure 1 shows an incision embodiment forming part of the prior art
- Figure 2 shows a variant of the tread comprising a plurality of optimized incisions according to the invention
- Figure 3 shows in section along lll-lll the tread shown with Figure 2;
- Figure 4 shows a second variant of optimized incision according to the invention
- Figure 5 shows a third variant of the invention for a tread comprising a hidden channel.
- Figure 1 shows an embodiment part of the prior art as described for example in document WO 2016/054278-A1.
- a wall 20 of an incision 2 is shown.
- protrusions 201 of rectangular shape intended to delimit narrow parts of the incision 2.
- large parts 22 are molded.
- L The other wall delimiting the same incision is not shown here: it can include protrusions in opposition or be flat.
- the wide parts 22 have a width at least equal to 0.4 mm and the narrow parts 21 a width less than 0.4 mm. According to this prior art, the wide parts arranged between the narrow parts are oriented in the direction of the thickness of the tread.
- Figure 2 shows a first variant of an optimized incision according to the invention.
- FIG. 2 partially shows the running surface 10 of a tread 1 in new condition, a circumferential relief element of which comprises a plurality of optimized incisions 2, these incisions opening onto the running surface 10.
- Two optimized incisions 2 have been shown, that of the bottom of the figure being in an unstressed state outside of contact with the roadway and that of the top of the figure in a closed state when passing through contact with the roadway.
- the optimized incision 2 is delimited by walls 20, 20 'distant from each other by a maximum distance D which is equal in this case to 0.6 mm.
- protrusions 201 are molded intended to delimit narrow incision portions 21 in combination with the wall 20 'facing it (the wall 20' is here without protuberance). Between the narrow parts 21 are reserved wide parts 22.
- Figure 3 shows one of the walls 20 delimiting the optimized incision 2 shown in Figure 2.
- protrusions 201 of triangular shape intended to reduce the width of the incision to form parts narrow 21.
- the wide parts 22 between two protrusions 201 are inclined relative to the direction of the depth of the incision 2, that is to say here with the direction of the thickness of the strip of rolling.
- the narrow parts 21 have a width equal to 0.2 mm.
- the total area of these narrow parts 21 represents in this case 60% of the total area of the wall 20 delimiting the optimized incision 2.
- the tops of the protrusions 201 have a rounded geometry.
- FIG. 4 shows a wall of a second variant of optimized incision 2 according to the invention.
- each wide part 22 formed between two narrow parts 21 comprises two sections 221, 222 forming between them a V, each section making an angle A of 30 ° with the direction of the thickness (direction E in this FIG. 4 ).
- Figure 5 shows a wall of a third variant of optimized incision 2 according to the invention for a tread comprising a hidden channel 5 oriented longitudinally (circumferentially on the tire when the latter is equipped with the tread according to the invention).
- the hidden channel 5 is delimited by facing walls 51, 52, these walls 51, 52 meeting by a bottom 53 and an upper part 54.
- a longitudinal incision 6 s 'extends to the new rolling surface 10.
- This longitudinal incision 6 of small width (at most equal to 0.6 mm) closes at least partially during the passage in contact with the roadway thus isolating the hidden channel 5 from outside.
- a plurality of optimized incisions 2 are oriented transversely and intersect this assembly formed by the hidden channel 5 and the longitudinal incision 6 which extends it towards the rolling surface 10.
- FIG. 5 shows a wall 20 of an optimized incision 2, this wall comprising a plurality of narrow parts delimited by wide parts 22.
- the narrow parts are formed between a wall 20 ′ of the incision (not shown) and the protrusions 201 locally reducing the width of the optimized incision 2.
- the area occupied by all of the protrusions 201 is here optimal and equal to 70% of the area of the wall 20 carrying these protrusions.
- the wide parts 22 form a drainage network and are interconnected with each other at mid-depth of the optimized incision 2.
- Each wide part 22 formed between two narrow parts comprises three sections of different orientations, two sections 221, 223 inclined in the direction of the depth of the incision extending on each side an inclined section 222 at an angle of 45 degrees with the direction E of the depth of the optimized incision 2.
- a wide part 22 ' is formed along the hidden channel 5 and the longitudinal incision 6, this wide part 22' having the distinction of best following the sectional profile of this hidden channel 5 and the longitudinal incision 6.
- the geometry of this wide part 22 ' comprises a first section 221' parallel to the longitudinal incision 6 then comprises a section 222 'which follows the profile of the part upper 54 of the hidden channel 5 before continuing with a third section 223 ′ parallel to one of the side walls 51 of said channel 5.
- the inclined sections 222, 222 ' represent in the case described 30% of the length of each wide part 22, 22' respectively.
- This geometry of the optimized incision 2 in combination with the presence of at least one hidden channel is particularly advantageous because it makes it possible to have a very large percentage of narrow parts (at least equal to 70%) which allows to obtain an appropriate rigidity while ensuring good drainage of the running surface during driving in rainy weather.
- narrow parts at least equal to 70%
- the wide parts formed between the narrow parts can follow curvilinear and non-rectilinear shapes as described above.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1873840A FR3090484A3 (fr) | 2018-12-21 | 2018-12-21 | Bande de roulement de pneu pour poids lourd ayant des incisions améliorées. |
FR1900894A FR3090485B1 (fr) | 2018-12-21 | 2019-01-31 | Bande de roulement de pneu pour poids lourd ayant des incisions améliorées. |
PCT/FR2019/053095 WO2020128281A1 (fr) | 2018-12-21 | 2019-12-16 | Bande de roulement de pneu pour poids lourd ayant des incisions ameliorees |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3898283A1 true EP3898283A1 (fr) | 2021-10-27 |
Family
ID=66867445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19842826.0A Withdrawn EP3898283A1 (fr) | 2018-12-21 | 2019-12-16 | Bande de roulement de pneu pour poids lourd ayant des incisions ameliorees |
Country Status (4)
Country | Link |
---|---|
US (1) | US20220072912A1 (fr) |
EP (1) | EP3898283A1 (fr) |
CN (1) | CN113195261A (fr) |
FR (2) | FR3090484A3 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4309918A1 (fr) * | 2022-07-20 | 2024-01-24 | Toyo Tire Corporation | Pneumatique et moule pour le moulage de pneumatique |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2066180T3 (es) * | 1990-09-05 | 1995-03-01 | Goodyear Tire & Rubber | Huella de neumatico para grandes vehiculos a motor. |
EP0820885A3 (fr) * | 1996-07-24 | 1998-07-08 | Bridgestone Corporation | Bandage pneumatique |
FR2759323B1 (fr) * | 1997-02-12 | 1999-03-19 | Michelin & Cie | Sculpture de bande de roulement et procede de fabrication |
JP2000211320A (ja) * | 1999-01-21 | 2000-08-02 | Bridgestone Corp | 空気入りタイヤ及びサイプ用ブレ―ド |
JP4281917B2 (ja) * | 2004-07-21 | 2009-06-17 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
NL2000322C2 (nl) * | 2006-11-20 | 2008-05-21 | Vredestein Banden B V | Loopvlak van een rubberband. |
FR2921586B1 (fr) * | 2007-09-27 | 2011-05-06 | Soc Tech Michelin | Bande de roulement de pneu comprenant des plots de gomme |
FR2924981B1 (fr) * | 2007-12-17 | 2009-11-27 | Michelin Soc Tech | Bande de roulement pour pneumatique neige. |
CN102149548B (zh) * | 2008-09-11 | 2014-09-17 | 米其林研究和技术股份有限公司 | 具有可变表面面积的轮胎胎面和轮胎 |
FR2939361A1 (fr) * | 2008-12-05 | 2010-06-11 | Michelin Soc Tech | Bande de roulement pour pneu comportant des incisions pourvues de protuberances |
JP5270417B2 (ja) * | 2009-03-26 | 2013-08-21 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
FR2965512B1 (fr) * | 2010-09-30 | 2012-09-21 | Michelin Soc Tech | Bande de roulement perfectionnee pour pneumatique. |
JP5652099B2 (ja) * | 2010-10-04 | 2015-01-14 | 横浜ゴム株式会社 | 空気入りタイヤ |
US20160272012A1 (en) * | 2011-04-29 | 2016-09-22 | Compagnie Generale Des Etablissements Michelin | Tire with tread having bridged areas with split contact faces within a longitudinal groove |
FR2977830B1 (fr) * | 2011-07-12 | 2013-07-12 | Michelin Soc Tech | Bande de roulement de pneu pourvue d'incisions comprenant des parties larges et des parties etroites |
KR101496030B1 (ko) * | 2013-09-02 | 2015-02-25 | 한국타이어 주식회사 | 3d 블레이드를 적용한 공기입 타이어의 패턴 구조 및 이를 포함하는 공기입 타이어 |
FR3014746B1 (fr) * | 2013-12-13 | 2017-08-11 | Michelin & Cie | Bande de roulement evolutive pour pneu. |
FR3017076B1 (fr) * | 2014-02-03 | 2016-02-12 | Michelin & Cie | Bande de roulement pour pneu poids lourd |
CN106794649B (zh) * | 2014-09-30 | 2019-11-01 | 米其林集团总公司 | 轮胎沟槽模制部件的加强件 |
JP6621312B2 (ja) * | 2015-11-24 | 2019-12-18 | 株式会社ブリヂストン | 空気入りタイヤ |
WO2018101933A1 (fr) * | 2016-11-30 | 2018-06-07 | Compagnie Generale Des Etablissements Michelin | Bandes de roulement de pneumatique améliorées présentant des lamelles à inclinaison positive |
-
2018
- 2018-12-21 FR FR1873840A patent/FR3090484A3/fr active Pending
-
2019
- 2019-01-31 FR FR1900894A patent/FR3090485B1/fr active Active
- 2019-12-16 CN CN201980083070.9A patent/CN113195261A/zh active Pending
- 2019-12-16 EP EP19842826.0A patent/EP3898283A1/fr not_active Withdrawn
- 2019-12-16 US US17/416,112 patent/US20220072912A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CN113195261A (zh) | 2021-07-30 |
FR3090485B1 (fr) | 2021-04-23 |
US20220072912A1 (en) | 2022-03-10 |
FR3090485A1 (fr) | 2020-06-26 |
FR3090484A3 (fr) | 2020-06-26 |
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