• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Tread (1) for a truck tire, said tread having a total width W and being provided with two main grooves (2) of generally circumferential orientation, said main grooves (2) dividing the tread ( 1) in three regions, a median region (M) and two edge regions (B) axially on either side of the median region, the median region (M) having an axial width Lm of at least 45% and at most 70% of the total width W of the tread, the hollow volume ratio of the strip when new is less than 17%, this trough ratio being calculated as the ratio between the total trough volume and a total volume including all the depressions and evaluated between the running surface in the new state and an inner surface extending in the tread parallel to the running surface in the new state, this inner surface being in radially contact inside with the stitches s the innermost deepest main grooves (2), this tread (1) being such that the median region has a new state of trough volume less than half of the trough volume ratio total of the band in the new state and in that the middle part comprises a plurality of transverse or oblique incisions (6) having a depth at least equal to the depth of the main grooves (2), these transverse incisions (6). or oblique opening in the main grooves (2) delimiting the central region (M) and being formed with a mean pitch Pm.
    公开号:FR3017075A1
    申请号:FR1400295
    申请日:2014-02-03
    公开日:2015-08-07
    发明作者:Fabien Marlier；Maxime Rolland；Damien Bardin；Christophe Gayton；Tony Zivkovic
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] P10-3266 - FR TIRE TREAD FOR TIRES HEAVY WEIGHT. FIELD OF THE INVENTION [0001] The present invention relates to a tire tread for a heavy vehicle and more particularly to the tread of such a strip for a tire intended to be mounted on a driving axle. STATE OF THE ART [0002] In order to ensure both satisfactory adhesion and good drainage of the water during taxiing on pavement covered with water, it is necessary to form on a tread a more or less complex system of cutouts. comprising a plurality of grooves and incisions. These cutouts form a pattern of sculpture both on the surface called the running surface intended to come into contact with the roadway and in the thickness of the strip. It is known in particular from the patent document FR 1452048 to form large cutouts (grooves) and narrow cutouts (incisions). The latter have appropriate widths to be able to close when passing through the area of contact with the roadway. Thus it is possible to benefit from the presence of ridges while maintaining sufficient rigidities. The person skilled in the art must consequently combine a necessary volume of drainage constituted by the void volumes formed in particular by the grooves and active edge lengths comprising both the ridges of the grooves and incisions. It is also known from publication WO-2010072523-A1 to form a reduced hollow volume in the new state, this hollow volume comprising portions intended to form new grooves after partial wear, these hollow volumes. being connected to the grooves formed as new by a plurality of transverse incisions. The need has been felt to further improve the balance between the total volume of troughs in new condition and the active edge lengths in the contact of the strip with the roadway and that at different levels of wear. Definitions: By radial direction is meant in this document a direction which is perpendicular to the axis of rotation of the tire (this direction corresponds to the direction of the thickness of the tread). By transverse or axial direction means a direction parallel to the axis of rotation of the tire. By circumferential direction is meant a direction that is tangent to any circle centered on the axis of rotation. This direction is perpendicular to both the axial direction and a radial direction. Equatorial median plane: it is a plane perpendicular to the axis of rotation and passing through the points of the tire radially furthest from said axis. For a tread this plane divides the band in its width into two halves of equal widths. A rib is a raised element formed on a tread, this element extending in the circumferential direction and running around the tire. A rib comprises two side walls and a contact face, the latter being intended to come into contact with the roadway during driving. [0012] A cutout generically designates either a groove or an incision and corresponds to the space delimited by material walls facing each other and distant from each other by a non-zero distance (called "width of the cutout "). What differentiates an incision from a groove is precisely this distance; in the case of an incision, this distance is appropriate to allow the at least partial contact of the opposite walls delimiting said incision at least during the passage in the contact with the roadway. In the case of a groove, the walls of this groove can not come into contact with one another under the usual conditions of rolling. A tread has a maximum thickness PMU of material to be used in rolling; once this thickness is reached either the tire can be regrooved to benefit from new grooves or the tire is replaced by another new tire. The surface hollow area of a sculpture is equal to the ratio between the surface of the recesses formed by the grooves and the total surface (contact surface of the relief elements and surface of the recesses). A low trough ratio indicates a large contact area of the relief elements and a small trough surface between these elements. The hollow volume ratio of a sculpture of a tread in the new state is equal to the ratio between the volume of the depressions (formed in particular by grooves, cavities) formed in the tread and the tread. total volume of said band comprising the volume of material to be used and the volume of the hollows. A low hollow volume rate indicates a low void volume relative to the volume of material to be treaded. [0016] As the tread wear increases, it is possible to define a remaining volume of troughs as well as a volume trough ratio.
    [0002] 100171 The usual conditions of tire rolling or conditions of use are those defined in particular by the standard E.T.R.T.O. or any equivalent standard depending on the country concerned; these conditions of use specify the reference inflation pressure corresponding to the load capacity of the tire indicated by its load index and its speed code. These conditions of use can also be called "nominal conditions" or "conditions of use".
    [0003] 100181 The footprint of the roadway is made with the tire in static conditions that may be the nominal conditions or any other specified condition; from this imprint it is easy to calculate an average length value of the imprint in the circumferential direction. BRIEF SUMMARY OF THE INVENTION [0019] The present invention aims at providing a tread for a truck tire, this belt having a tread design allowing both an improvement in wear performance as well as a reduction in rolling resistance while maintaining proper adhesion regardless of the state of wear of this band. For this purpose, the invention relates to a tread for a truck tire, this tread has a total width W and is provided with two generally circumferential grooves, these grooves dividing the strip. in three regions, a median region and two edge regions axially on either side of the median region, the median region having an axial width Lm of at least 45% and at most 70% of the total width W of the tread. This band has a total trough volume in the new VO state; the middle portion of this tread has a total trough volume Vm in new condition. The hollow volume ratio of the strip in the new state is less than 17% and the level of hollow volume in the new state of the middle region is less than half of the total volume of the hollow volume of the strip in new condition. The total void ratio of the new web is calculated as the ratio of the total trough volume to a total web volume including both the volume of material and the volume of all troughs. total strip being evaluated between the running surface in the new state and an inner surface extending in the tread parallel to the running surface when new, this inner surface being in contact radially on the inside with the innermost points of the band the deepest circumferential grooves. In addition, this tread is such that the median portion comprises a plurality of transverse or oblique incisions having a depth at least equal to 75% of the depth of the main grooves of circumferential orientation, these incisions opening in the circumferential grooves delimiting the middle region and being formed with a medium pitch Pm. The number of transverse or oblique incisions of the central region to the complete tire turn is greater than the number of transverse or oblique incisions of each other intermediate or edge region. Preferably, the edge regions are either devoid of any incisions 30 or possibly provided with incisions of transverse or oblique orientation arranged with a mean pitch Ps, this average pitch Ps being greater than the average pitch Pm of the incisions of the region. median. Preferably, the average pitch Ps of the incisions of transverse or oblique orientation in the region of the edges is at least greater than 1.25 times the average pitch Pm of the incisions of the median region. The axial width of the median region is defined as the average axial distance separating the axially innermost walls of the circumferential grooves delimiting this median region. This median region is devoid of any circumferential groove opening on the running surface in the new state. By oblique orientation, here is meant that each incision of the median part makes an angle at least equal to 45 degrees with the circumferential direction. In a variant of the invention, the tread as defined further comprises in its median part at least two circumferential incisions, these circumferential incisions being extended inside the band by widened parts forming channels. these channels being intended to form new grooves after a predetermined partial wear of the tread. Advantageously, at least one of these channels appears at the latest from a partial wear equal to 60% of the depth of the main grooves. [0031] Advantageously, the hollow volume ratio of the strip in the new state is less than 10% and the hollow volume ratio of the middle region in the new state is at most equal to 3%. The invention also relates to a tire provided with a tread as defined above, this tire being more particularly but not only intended to equip a drive axle of a heavy vehicle. [0033] Other characteristics and advantages of the invention appear from the description given hereinafter with reference to the accompanying drawings which show, by way of non-limiting examples, embodiments of the object of the invention. . BRIEF DESCRIPTION OF THE FIGURES FIG. 1 shows a plan view of a tread pattern of a tread according to a variant of the invention; Figure 2 shows a sectional view along a plane perpendicular to the plane of Figure 1 and passing through the line II-11; [0036] Figure 3 shows a plan view of a tread pattern of a tread according to another embodiment of the invention. DESCRIPTION OF THE FIGURES To facilitate the reading of the figures, the same reference signs are used for the description of variants of the invention since these reference signs refer to elements of the same nature that it is structural or functional. Figure 1 shows a partial plan view in new condition of a tread pattern of a tread according to a first embodiment of the invention. The tread 1 according to the invention is intended to be part of a tire size 315 / 70R22.5 intended to equip the drive axle of a heavy vehicle. This tread 1 has a new running surface 10 which is shown partially in FIG. 1. This strip has a width W measured in the axial direction equal to 270 mm. This tread 1 comprises a directional sculpture pattern imposing a rolling direction. This sculpture design comprises two main grooves 2 of circumferential general orientation and having a slightly zigzag geometry around the circumferential direction; these main grooves 2 open on the running surface 10 in the new state and are formed on either side of the equatorial median plane indicated by its trace XX 'in this figure. These two main grooves 2 delimit between them a median region M whose width Lm taken between the walls 25 axially the most inside the main grooves 2 is here equal to 159 mm (59% of the total width W). These main grooves 2 have an average width equal to 9 mm on the running surface in new condition and a width of 4 mm at a maximum depth equal to 13.5 mm. Axially on the outside of each main groove 2 is formed an edge region B provided with a plurality of oblique grooves 3. These oblique grooves 3 delimit a plurality of blocks 31 devoid of any incisions. The central region M further comprises three incisions 41, 42, 43 of circumferential orientation opening on the running surface in the new state, each of these incisions being extended in the thickness of the strip by channels 51, 52, 53 respectively, these channels being intended to form new grooves after partial wear. These channels are visible in Figure 2 showing a section of the tread. In the case of this first variant, the total volumetric total rate in the new state is equal to 9.6% while the hollow volume ratio of the middle region in the new state is equal to 3.0%. The total void ratio is calculated in the new state of the band by summing the volumes of the circumferential grooves and transverse grooves as well as the volumes of the channels. In addition, the median region is provided with a plurality of oblique incisions 6 forming a general V-shaped pattern between the two circumferential grooves. These oblique incisions are arranged with a mean pitch Pm equal to 25.1mm. These oblique incisions 6 have an average width equal to 0.6 mm and open in the main grooves 2 and in the circumferential incisions 6 of the central region M. In addition, these oblique incisions 6 open in the channels 51, 52, 53 formed in the thickness of the tread. Figure 2 shows a sectional view along a plane perpendicular to the plane of Figure 1 and whose trace in this Figure 1 is represented by the line 11-11. In this Figure 2 we see that the median channel 52 forms a new groove after a partial wear equal to 48% while the other new grooves are formed by the other channels 51, 53 after a partial wear equal to 56%. These percentages of wear are evaluated with respect to the thickness PMU of material to be used. The central channel 52 has an average width of 4.5 mm and a total height of 7 mm. The other two channels 51, 53 have a width of 45 mm and a height of 6 mm. The innermost points of these channels 51, 52, 53 are at the same depth in the tread as the innermost points of the main grooves 2. [0047] In another variant shown with FIG. 3, a tread 1 according to the invention for a heavyweight tire of size 11822.5 comprises two circumferential main grooves 2 dividing the band in its width into a median region M of width Lm equal to 121 mm (54% of the total width W of the band) and edge regions B of width equal to 42 mm These main grooves 2 have an average width equal to 13 mm and a depth equal to 15.5 mm. The angle of clearance of the walls of the grooves is equal to 16 degrees with a direction perpendicular to the rolling surface 10. The central region M further comprises two rectilinear incisions 6 of circumferential orientation opening on the surface of bearing 10 in new condition, each of these incisions being extended in the thickness of the strip by channels intended to form new grooves after 51% wear (this percentage is measured with respect to the material thickness PMU) to use). Each channel has an average width equal to 5 mm and a height equal to 8 mm. In addition, the median region M is provided with a plurality of oblique incisions 6 in a general zigzag pattern between the two main grooves 2. These oblique incisions 6 open in the main grooves and cut the incisions 20 circumferential 41, 42. These oblique incisions 6 are arranged with a mean pitch Pm equal to 28.7 mm. Each oblique incision 6 extends in the thickness of the strip to a channel 51, 52, these channels being intended to form new grooves after a predetermined partial wear. At each intersection between an oblique incision 6 and a circumferential incision 41, 42 is formed a well 7 of radial direction, itself connected to an underlying channel (well diameter equal to 5 mm). In the case of this second variant, the total hollow volume rate is equal to 9.37% while the hollow volume ratio of the middle region is equal to 2.77%. The total hollow volume rate is calculated at the new state of the band by summing the volumes of the main circumferential grooves 2 and the volumes of the channels 51, 52 30 as well as those of the radial wells 7. [0051] Axially outside from each main groove 2 is formed an edge region B devoid of any groove and incision. Of course, the invention is not limited to the examples described and shown and various modifications can be made without departing from the scope defined by the claims.
    权利要求:
    Claims (3)
    [0001]
    CLAIMS 1- Tread (1) for a truck tire, this tread having a total width W and being provided with two main grooves (2) of generally circumferential orientation, these main grooves (2) dividing the tread rolling (1) in three regions, a median region (M) and two edge regions (B) axially on either side of the median region, the median region (M) having an axial width Lm of at least 45; % and at most 70% of the total width W of the tread, this tread having a total trough volume in the new state VO, the middle part of this tread having a total trough volume Vm at the tread new state, the hollow volume ratio of the strip in the new state is less than 17%, this hollow rate being calculated as the ratio between the total void volume VO and a total volume including all the depressions and evaluated between the running surface in new condition and an internal surface extending in the tread parallel to the running surface when new, this inner surface being in radially inward contact with the innermost points of the deepest main grooves (2), this tread (1) being characterized in that the median region has a new low level of trough volume less than half of the total trough volume ratio of the strip in the new state and that the median comprises a plurality of transverse or oblique incisions (6) having a depth of at least 75% of the depth of the main grooves (2), these transverse or oblique incisions (6) opening in the main grooves (2) delimiting the median region (M) and being formed with a mean pitch Pm.
    [0002]
    2- tread according to claim 1 characterized in that the edge regions are devoid of any incisions.
    [0003]
    3- Tread according to claim 1 characterized in that the edge regions are provided with transverse or oblique orientation incisions arranged with a mean pitch Ps, this average pitch Ps being greater than the average pitch Pm of the incisions of the region Median.- Tread according to claim 3 characterized in that the edge regions are provided with transverse or oblique orientation incisions arranged with a mean pitch Ps, the average pitch Ps being at least greater than 1.25 times the pitch mean Pm incisions of the middle region. 5- tread according to any one of claims 1 to 4 characterized in that it further comprises in its median region at least two circumferential incisions (41, 42, 43), these two circumferential incisions being extended to the the interior of the strip by widened portions forming channels (51, 52, 53), these channels being intended to form new grooves after a predetermined partial wear of the tread. 6- tread according to any one of claims 1 to 5 characterized in that at least one channel formed in the middle region appears at the latest from a partial wear equal to 60% of the depth of the main grooves (2). 7- A tread according to any one of claims 1 to 6 characterized in that the hollow volume of the band in the new state is less than 10% and in that the trough volume of the central region in new condition is at most equal to 3%. 8- Tire with a tread according to any one of claims 1 to 7, the tire being more particularly intended to equip a drive axle of a heavy vehicle.
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    同族专利:
    公开号 | 公开日
    WO2015114128A1|2015-08-06|
    US10369846B2|2019-08-06|
    US20170174008A1|2017-06-22|
    EP3102437A1|2016-12-14|
    CN105960338A|2016-09-21|
    EP3102437B1|2018-12-12|
    FR3017075B1|2016-02-12|
    CN105960338B|2019-05-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2012130735A1|2011-04-01|2012-10-04|Compagnie Generale Des Etablissements Michelin|Tread including at least one wavy groove, and method for producing same|
    WO2012131081A1|2011-04-01|2012-10-04|Compagnie Generale Des Etablissements Michelin|Improved tread for heavy goods vehicle tyre|
    WO2013014253A1|2011-07-28|2013-01-31|Compagnie Generale Des Etablissements Michelin|Tread pattern for tires for a civil engineering vehicle|
    WO2013150143A1|2012-04-05|2013-10-10|Compagnie Generale Des Etablissements Michelin|Heavy goods vehicle driven axle tyre tread|CN108437703A|2017-02-16|2018-08-24|住友橡胶工业株式会社|Tire|FR2995253B1|2012-09-13|2015-01-16|Michelin & Cie|TIRE TREAD AND TIRE FOR HEAVY WEIGHT|WO2017039679A1|2015-09-04|2017-03-09|Compagnie Generale Des Etablissements Michelin|Truck tire tread and truck tire|
    JP6621312B2|2015-11-24|2019-12-18|株式会社ブリヂストン|Pneumatic tire|
    FR3045473B1|2015-12-16|2017-12-22|Michelin & Cie|PNEUMATIC HAVING IMPROVED WEAR AND ROLL RESISTANCE PROPERTIES|
    FR3045481B1|2015-12-16|2017-12-22|Michelin & Cie|PNEUMATIC HAVING IMPROVED WEAR AND ROLL RESISTANCE PROPERTIES|
    FR3045483B1|2015-12-16|2017-12-22|Michelin & Cie|PNEUMATIC HAVING IMPROVED WEAR AND ROLL RESISTANCE PROPERTIES|
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    FR3045487B1|2015-12-16|2017-12-22|Michelin & Cie|PNEUMATIC HAVING IMPROVED WEAR PROPERTIES|
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    FR3045465B1|2015-12-16|2017-12-22|Michelin & Cie|PNEUMATIC HAVING IMPROVED WEAR PROPERTIES|
    FR3049218A1|2016-03-25|2017-09-29|Michelin & Cie|INCLINED TIRE RUN FOR OFF-ROAD TIRES|
    WO2017176280A1|2016-04-08|2017-10-12|Compagnie Generale Des Etablissements Michelin|Truck tire tread and truck tire|
    JP6938870B2|2016-08-29|2021-09-22|横浜ゴム株式会社|Pneumatic tires|
    FR3061081A1|2016-12-28|2018-06-29|Compagnie Generale Des Etablissements Michelin|TREAD BAND COMPRISING HIDDEN CAVITIES|
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    FR3063454A1|2017-03-03|2018-09-07|Compagnie Generale Des Etablissements Michelin|TIRE TREAD TIRE FOR VEHICLE TRAILER HEAVY WEIGHT|
    JP2019001343A|2017-06-16|2019-01-10|株式会社ブリヂストン|tire|
    EP3643525B1|2017-06-19|2022-02-23|Bridgestone Corporation|Tire|
    IT201700084726A1|2017-07-25|2019-01-25|Prometeon Tyre Group S R L|TIRES FOR VEHICLE WHEELS|
    CN111565943A|2018-01-18|2020-08-21|横滨橡胶株式会社|Pneumatic tire|
    DE102020201730A1|2020-02-12|2021-08-12|Continental Reifen Deutschland Gmbh|Pneumatic vehicle tires|
    DE102020204226A1|2020-04-01|2021-10-07|Continental Reifen Deutschland Gmbh|Pneumatic vehicle tires, in particular commercial vehicle tires|
    WO2021261010A1|2020-06-24|2021-12-30|住友ゴム工業株式会社|Tire|
    WO2021261009A1|2020-06-24|2021-12-30|住友ゴム工業株式会社|Tire|
    法律状态:
    2015-02-19| PLFP| Fee payment|Year of fee payment: 2 |
    2016-02-18| PLFP| Fee payment|Year of fee payment: 3 |
    2017-02-17| PLFP| Fee payment|Year of fee payment: 4 |
    2018-02-23| PLFP| Fee payment|Year of fee payment: 5 |
    2019-10-25| ST| Notification of lapse|Effective date: 20191006 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1400295A|FR3017075B1|2014-02-03|2014-02-03|TIRE TREAD TIRE FOR HEAVY WEIGHT|FR1400295A| FR3017075B1|2014-02-03|2014-02-03|TIRE TREAD TIRE FOR HEAVY WEIGHT|
    US15/115,968| US10369846B2|2014-02-03|2015-02-02|Tread for heavy vehicle tire|
    EP15703760.7A| EP3102437B1|2014-02-03|2015-02-02|Tread for goods vehicle tyre|
    PCT/EP2015/052037| WO2015114128A1|2014-02-03|2015-02-02|Tread for goods vehicle tyre|
    CN201580006997.4A| CN105960338B|2014-02-03|2015-02-02|The tyre surface of truck tire|
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