• 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 tire, this tread comprising at least two grooves (2, 3) of generally circumferential orientation delimiting intermediate portions (4) and edge portions (5), these orientation grooves circumferential generally being formed to be present at least until the wear limit of the band is reached, this tread comprising a tread surface (10) in new condition, this tread comprising at least a limit wear indicator formed in a circumferential groove (2, 3) to indicate the limit of use of this rolling strip, said strip comprising on its edge regions (5) a plurality of orientation cutouts (6) transverse general and depth appropriate to be present until the limit wear of the strip, each cutout (6) of general transverse orientation being formed of a first portion (61) opening on the surface of rouleme nt (10) in new condition, this first part (61) being extended towards the inside of the band by a hollow part forming a channel (63) of average width greater than the average width of the groove, this channel (63) being intended to form a new transverse groove after a predetermined partial wear, this tread being characterized in that the section of each channel (63), between the bottom of this channel and at least one height equal to the height of the limit wear indicator, increases when the cutout (6) is traversed axially from the inside of the strip towards the outside of the strip.
    公开号:FR3019096A1
    申请号:FR1452815
    申请日:2014-03-31
    公开日:2015-10-02
    发明作者:Gasselin Benoit Durand；Matthieu Bonnamour
    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] P10-3308 EN - 1 - TREAD BAND HAVING CHANNELS ON ITS EDGES. FIELD OF THE INVENTION [0001] The present invention relates to a tire tread comprising a plurality of wear layers, some of these wear layers forming new grooves opening on the tread surface of the tread. STATE OF THE ART [0002] A tread of a tire extends circumferentially around the tire and acts as an intermediate between the tire structure and the surface or surface on which the tire rolls. The contact between the tread and the roadway is in a contact footprint. A tread comprises a tread formed of a plurality of raised elements - rib and / or blocks - separated from each other by grooves and / or incisions. These grooves and incisions form on the tread surface edges useful for obtaining traction performance in terms of traction, braking and cornering. A problem facing the skilled person lies in the preservation of the performance of the tire with the wear of its tread. Discloses a tread pattern comprising a plurality of wear layers with for each wear layer a specific and specific trough volume rate for each wear layer is known from WO2012 / 058171 published in 2012. . Indeed, if one has a too high rate of troughs in new condition, it is certainly possible to have a hollow rate after partial wear, but there is then a loss of rigidity to new condition that may be detrimental to other performances. Furthermore, a tire tread of a passenger vehicle has an external profile which is not cylindrical about the axis of rotation of the tire provided with this band. This profile seen in a plane containing the axis of rotation is curvilinear and has more pronounced curvatures in the regions of the axially outer edges of the strip. In these regions and because of this transverse profile, everything happens as if the thickness to use the strip was reduced. The document WO2012 / 058171 quoted does not deal with this problem: indeed, with the wear of the tread the volume available for the flow of water during driving in rainy weather is reduced and that of as far as one approaches the regions axially outside the tread. There is therefore a need to create a tire tread intended to equip a passenger vehicle that allows both to ensure durability of performance with wear while solving the problem described above. [0007] Definitions: The trough rate of a tread is equal to the ratio between the surface of the troughs (grooves) delimited by the blocks and the total surface (contact surface of the blocks and surface of the troughs). A low trough rate indicates a large contact area of the blocks and a small trough surface between the blocks. The surface trough ratio of a tread is equal to the ratio between the surface of the troughs (essentially formed by grooves) delimited by the relief elements (blocks, ribs) and the total surface (contact surface of the elements of the troughs). relief and surface of the hollows). A low trough ratio indicates a large tread contact area and a small trough surface between the tread elements. The trough volume of a sculpture of a tread in the new state is equal to the ratio between the volume of the troughs (formed in particular by grooves, cavities) delimited by the relief elements (blocks , ribs) and the total volume of the tread comprising the volume of material to be used and the volume of the troughs. A low trough rate indicates a low void volume relative to the tread volume. For each level of wear, one can also define a volume of hollow. Equatorial plane: plane perpendicular to the axis of rotation and passing through the points of the tire axially the outermost, this equatorial plane virtually dividing the tire into two substantially equal halves. A block is a raised element formed on the tread which is delimited by recesses or grooves and comprising side walls and a contact face - 3 - intended to come into contact with the roadway. This contact face has a geometric center defined as the center of gravity or center of gravity of the face. 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. By radial direction means 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 means a direction which is tangent to any circle centered on the axis of rotation. This direction is perpendicular to both the axial direction and a radial direction. By axially outwardly, we mean a direction which is oriented towards the outside of the internal cavity of the tire. The total thickness E of a tread is measured, on the equatorial plane of the tire provided with this band, between the running surface and the radially outermost part of the crown reinforcement to new condition. The usual tire rolling conditions or conditions of use are those defined by the standard E.T.R.T.O. ; 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". By wear indicator is meant a device that can be molded with the tread which facilitates the reading of the wear of this band when rolling by the user. In general, a tread comprises several wear indicators each formed of a height redent fixed by the legislation and molded in the grooves of this band. The footprint of a contact with a ground is made with the tire under static conditions; from this imprint, an average value of imprint length in the circumferential direction is calculated. A cutout generically designates an opening made in particular by molding and corresponds to the space delimited by walls of material facing each other and distant from each other by a non-zero distance (called "width of the cutout "). A cutout may be either a groove or an incision or a combination of at least one groove and at least one incision. What differentiates an incision from a groove is precisely the distance separating the walls of material facing each other; in the 1 () case of an incision, this distance is appropriate to allow the at least partial contact of the walls delimiting said incision at least during the passage in the contact with the roadway. In the case of a groove, the walls defining this groove can not come into contact with one another under the usual conditions of rolling. BRIEF SUMMARY OF THE INVENTION The present invention aims to improve both the performance in new condition and maintain these good performance after partial wear and that until complete wear. [0024] For this purpose, the subject of the invention is a tread for a tire, this tread comprising at least two grooves of generally circumferential orientation delimiting intermediate portions and edge portions, these parts of an edge. axially delimiting the tread. These generally circumferential grooves are formed to be present at least until the wear limit of the web is reached. This tread comprises a running surface in the new state, this running surface having an external transverse profile obtained as the intersection of the running surface with a plane containing the axis of rotation of the tire, this transverse profile. curvilinear generating a reduction in the thickness of material to be used on the edge regions of the tread. This band comprises at least one limit wear indicator formed in at least one circumferential groove to indicate the limit of use of this band rolling and thus allow the user to replace the worn tire with a new tire. Furthermore, this strip comprises on its edge regions a plurality of generally transverse orientation and depth appropriate cuts to be present until reaching the limit wear of the strip. Each transverse general orientation cutout is formed of a first portion opening on the running surface in the new state, this first portion having an average width and being extended towards the inside of the strip by a hollow portion. forming a channel of average width greater than the average width of the first portion, this channel having a bottom and being adapted to form a new transverse groove after a predetermined partial wear. This tread is such that the section of each channel, this section being taken between the bottom of this channel and at least a height equal to the height of the limit wear indicator, increases when one traverses the cutout moving axially from the inside of the band to the outside of the band. Advantageously, this tread is such that each cutout formed by a first portion extended by a channel has a total section in the new state which is: either constant over the entire length of said cut, or is increasing in going axially out of the band. By total section of a cutout is meant the area of the cross section of this cutout taken at different positions between its ends. Each transverse cutout opens axially outside the tread, that is to say on a side portion of the strip, and may or may not open in a circumferential groove. [0030] Advantageously, the maximum depth of each cutout formed on the edge regions is equal to the maximum depth of the generally circumferential grooves. The first part of each transverse cutout formed on the edge regions may be formed by an incision whose walls defining it are able to come into contact with one another when passing through the contact. This first part can also be a groove. Advantageously, each transverse cutout formed on the edge regions comprises an intermediate portion ensuring a progressive connection between the first part of the cutout opening on the running surface in the new state and the channel extending towards inside this groove. With this solution, it is possible, and although the total thickness in the new state is reduced on the edges of the tread given its curvilinear transverse profile, to maintain a satisfactory level of performance. driving on water-filled pavement when the wear of the belt reaches the legal limit of wear. Other features and advantages of the invention appear from the description given below 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 [0035] FIG. 1 represents a partial plan view of a surface of a tread; Figure 2 is a perspective view of an edge region of the tread shown in Figure 1; Figure 3 shows a sectional view along the line I-I taken in Figure 1; Figure 4 shows a sectional view along the line II-II taken in Figure 1. DESCRIPTION OF THE FIGURES [0039] Figure 1 shows a partial plan view of a running surface 10 of a strip of In this Figure 1, there is shown partially a tread 1 intended to equip a tire of a passenger vehicle. This tread 1 comprises four circumferential grooves 2, 3 having all the same depth equal to 8 mm. Wear indicators are molded on the bottom of at least one of these grooves. The depth of these grooves 2, 3 is such that, when the wear of the strip reaches the wear limit fixed by the national regulations (the molded wear indicators come into contact with the running surface), these grooves have not completely disappeared and there is still a possibility of drainage of the water possibly present on a roadway. The two circumferential grooves 2 closest to the equatorial plane (indicated by a line XX 'in FIG. 1) have an average width equal to 10 mm while the other two grooves 3 have an average width equal to 8 mm. These four grooves define three intermediate rows 4 and two rows of edge 5 axially defining the tread 1. The intermediate rows 4 are provided with a plurality of oblique incisions 41 closing during passage through the contact. On this tread and more precisely in the circumferential grooves several wear limit indicators 8 are molded all around the band to allow the user an easy reading of the level of wear of his tires and to make sure that his tires have not reached the legally prescribed level of wear. In this case, the wear limit indicators 8 form a relief on the bottom of the grooves with a height equal to 1.6 mm. Consequently, when the outer surface of these indicators 8 comes into contact with the roadway, sufficient depth remains for the circumferential grooves which makes it possible to ensure safe driving. At this time, it becomes of course necessary for the user to replace this worn tire with a new tire. Each edge row 5 comprises a plurality of transverse cutouts 6, each transverse cutout 6 opening on the surface. 10 and in a circumferential groove 3. Each transverse cutout 6 comprises in this case a groove 61 opening on the running surface 10 in the new state, this groove 61 being extended by an intermediate connecting portion 62 of variable width in the depth of the strip, this intermediate connecting portion 62 ending in a channel 63 whose width is greater than the width of the groove 61. Given the external transverse profile of the tread to the new state (this profile 7 is visible in Figure 2 showing a partial perspective view of an edge region 5) and the internal reinforcement structure of a tire, it appears that the thicker r to wear at the edge of the tread is substantially reduced and this especially as one moves axially away from the equatorial median plane. If one wants to preserve the performance of the tread 1 in particular on its edge regions 5, it is advantageous to construct the transverse cuts 6 in these regions according to the invention, that is to say by making so that the section of each channel 63 is increasing by going axially from the inside of the tire to the outside, in particular by increasing its average width. Thus, after a wear corresponding to the wear limit, the volume available for drainage in the transverse cutouts (reduced to the channels) is not reduced in going outwards but on the contrary is increased in the present case. . Figure 3 shows a sectional view along the line II taken in Figure 1. In this Figure 3, we see that a transverse cutout 6 is formed of a groove 61 of constant width equal to 2.5 mm, extended inwardly by a channel 63 of maximum width Ll equal to 5.5 mm, the groove 61 being connected to the channel 63 by an intermediate connecting portion 62 having a variable width and suitable for connecting the groove 61 to the channel 63. The distance between the running surface 10 in the new state and the bottom of the channel 63 is noted P1 while the distance between the outer surface of the limit wear indicator TW indicated by the dotted line and the bottom of the channel is noted H. The section of the channel 63 remaining beyond the wear limit is 9 mm 2. The total section of the cutout in new condition is equal to 25 mm2. Figure 4 shows a sectional view along the line II-II taken in Figure 1. The position of this section is located axially outside the position of the section shown in Figure 3. [0049] The distance between the running surface 10 in new condition and the bottom of the channel 63 in this section plane is noted P2 while the distance between the outer surface of the limit wear indicator TW indicated by the line in dashed lines. dotted and the bottom of the channel is denoted H. In this figure 4, we see that in this sectional plane the transverse cutout 6 has a section equal to that it had for the position corresponding to the section shown with the 3, while the width of the groove 61 opening on the running surface in the new state is increased and is equal to 4.5 mm and the width L2 of the channel 63 remaining from the wear limit level TW is increased with respect to the width L1 of the channel taken in FIG. 3 so that the section the channel remaining from the level TW in this sectional plane II-II is greater than it is in the sectional plane II of FIG. 3. In this plane of section, the section of the channel remaining from the level of wear limit is equal to 12 mm2 (the maximum width of the channel is equal to 7.5 mm). In a variant not shown here, the width of each groove opening on the running surface in the new state remains constant over the entire length of the transverse cut, only varying by increasing the width of the channel extending each groove . In another variant not shown, the first part of the cutout is formed by an incision whose walls are adapted to be at least partially in contact with each other during the passage in the contact. It is of course possible to provide the walls of this incision with means, such as reliefs, cooperating with each other to limit relative movements. Of course, the invention is not limited to the examples described or 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 tire, the tread having a wear wear limit and comprising at least two grooves (2, 3) of circumferential general orientation defining intermediate portions (4) and parts edge portions (5), said edge portions (5) axially delimiting the tread (1), said generally circumferential grooves being formed to be present at least until the wear limit of the tread is reached, this tread comprising a tread surface (10) in the new state, this tread having an external transverse profile (7) obtained as the intersection of the running surface with a plane containing the axis of rotation of the tire, this transverse profile generating a reduction in the thickness of material to be used on the edge portions (5) of the tread, this tread comprising at least one limit wear indicator formed in a groove. re circumferential (2, 3) to indicate the limit of use of this strip when rolling, this band comprising on its edge regions (5) a plurality of cutouts (6) of general transverse orientation and opening on a part lateral tread, each transverse cut having a depth suitable to be present up to the limit wear of the strip, each cutout (6) of general transverse orientation being formed of a first portion (61) s' opening on the running surface (10) in new condition, this first portion (61) having an average width and being extended towards the inside of the strip by a hollow portion forming a channel (63) of greater average width to the average width of the first portion (61), this channel (63) being adapted to form a new transverse groove after a predetermined partial wear, this tread being characterized in that the section of each channel (63 ), this section being taken between the bottom of this channel and at least a height equal to the height of the limit wear indicator, increases when one traverses the cutout (6) while going axially from the inside of the band towards outside the band.
    [0002]
    2- Tread (1) for a tire according to claim 1 characterized in that the cutout (6) formed by a first portion (61) extended by a channel (63) has a total section in new condition which is constant over the entire length of said cutout.- Tread for a tire according to claim 1 characterized in that the cutout (6) formed by a first portion (61) extended by a channel (63) has a total cross-sectional area. a new state which increases as the axle is traversed axially from the inside of the band towards the outside of the band. 4- tread for a tire according to any one of claims 1 to 3 characterized in that the maximum depth of each cutout (6) formed on the edge regions (5) is equal to the maximum depth of the grooves of circumferential general orientation (2,
    [0003]
    3). Tread for a tire according to any one of claims 1 to 4, characterized in that the first portion (61) of each transverse cutout (6) formed on the edge regions (5) is formed by an incision of which the walls defining it are able to come into contact with each other when passing through the contact. 6. tread for a tire according to any one of claims 1 to 5 characterized in that each cutout (6) transverse formed on the edge regions (5) comprises an intermediate portion (62) providing a progressive connection between the first portion (61) opening on the tread surface (10) in new condition and the channel (63) extending inwardly this first portion (61). Tire tread according to one of claims 1 to 6, characterized in that the transverse cutouts (6) formed on the edge regions (5) open in a circumferential groove.
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    同族专利:
    公开号 | 公开日
    FR3019096B1|2016-03-18|
    CN106163830A|2016-11-23|
    CN106163830B|2018-01-30|
    WO2015150282A2|2015-10-08|
    EP3126158A2|2017-02-08|
    US20170120692A1|2017-05-04|
    JP2017509531A|2017-04-06|
    WO2015150282A3|2015-11-26|
    BR112016020083A2|2018-05-08|
    EP3126158B1|2019-11-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP2332745A2|2009-12-11|2011-06-15|The Goodyear Tire & Rubber Company|Tire tread having serrated grooves|
    WO2012058171A1|2010-10-29|2012-05-03|Michelin Recherche Et Technique S.A.|Tire tread having a plurality of wear layers|
    GB1407790A|1971-09-15|1975-09-24|Dunlop Ltd|Tyres|
    JPS59179408A|1983-03-31|1984-10-12|Yokohama Rubber Co Ltd:The|Pneumatic tire|
    IT1185117B|1985-06-26|1987-11-04|Pirelli|TIRE FOR VEHICLE WHEELS WITH LOW ROLLING RESISTANCE TREAD|
    JP3075628B2|1992-03-13|2000-08-14|株式会社ブリヂストン|Pneumatic tire|
    FR2763892A1|1997-05-30|1998-12-04|Michelin & Cie|SCULPTURE AND MOLD FOR TIRE TREAD|
    JP3822338B2|1997-11-19|2006-09-20|株式会社ブリヂストン|Pneumatic tire|
    JP2005193770A|2004-01-07|2005-07-21|Bridgestone Corp|Pneumatic tire and vulcanization mold|
    US7793692B2|2005-10-31|2010-09-14|The Goodyear Tire & Rubber Company|Pneumatic tire tread having sipe that devolves into groove as tread wears|
    US9981505B2|2008-06-23|2018-05-29|Compagnie Generale Des Etablissements Michelin|Tire with lamelle in bridge|
    JP5356285B2|2010-03-09|2013-12-04|東洋ゴム工業株式会社|Pneumatic tire|FR3049897A1|2016-04-08|2017-10-13|Michelin & Cie|IMPROVED TIRE TREAD FOR TIRES|
    JP6980515B2|2017-12-26|2021-12-15|Ｔｏｙｏ Ｔｉｒｅ株式会社|Pneumatic tires|
    US11148472B2|2018-04-06|2021-10-19|Sumitomo Rubber Industries, Ltd.|Tyre|
    JP2019188850A|2018-04-18|2019-10-31|住友ゴム工業株式会社|tire|
    法律状态:
    2015-03-19| PLFP| Fee payment|Year of fee payment: 2 |
    2016-03-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2018-03-23| PLFP| Fee payment|Year of fee payment: 5 |
    2019-11-29| ST| Notification of lapse|Effective date: 20191106 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452815A|FR3019096B1|2014-03-31|2014-03-31|TREAD BAND HAVING CHANNELS ON ITS EDGES|FR1452815A| FR3019096B1|2014-03-31|2014-03-31|TREAD BAND HAVING CHANNELS ON ITS EDGES|
    PCT/EP2015/056782| WO2015150282A2|2014-03-31|2015-03-27|Tread with channels on the edges of same|
    EP15741857.5A| EP3126158B1|2014-03-31|2015-03-27|Tread with channels on the edges of same|
    CN201580017107.XA| CN106163830B|2014-03-31|2015-03-27|There is the tyre surface of passage on the edge of tyre surface|
    JP2016557649A| JP2017509531A|2014-03-31|2015-03-27|Tread with channel on edge|
    BR112016020083A| BR112016020083A2|2014-03-31|2015-03-27|tread that has channels on its edges|
    US15/300,455| US20170120692A1|2014-03-31|2015-03-27|Tread with channels on the edges of same|
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