EP3071427A1 - Dispositif anti bruit ameliore pour pneu - Google Patents
Dispositif anti bruit ameliore pour pneuInfo
- Publication number
- EP3071427A1 EP3071427A1 EP14796012.4A EP14796012A EP3071427A1 EP 3071427 A1 EP3071427 A1 EP 3071427A1 EP 14796012 A EP14796012 A EP 14796012A EP 3071427 A1 EP3071427 A1 EP 3071427A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- groove
- flexible blade
- tread
- tire
- side walls
- 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- Withdrawn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
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
-
- 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
-
- 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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
- B60C2011/1338—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising protrusions
Definitions
- the present invention relates to tire treads and more particularly treads comprising grooves latter being provided with closing devices to reduce the noise generated by the resonance of the air in these grooves when rolling.
- each groove forms a pipe having two open ends.
- the air in this pipe forms a vibrating air column whose resonant frequency depends on the length separating the two ends of the pipe and consequently on the groove length affected by the contact with the roadway.
- This resonance of the air in the grooves has the consequence of generating, in a vehicle equipped with these tires, a noise inside the vehicle and a noise outside the vehicle.
- These indoor and outdoor noise most often correspond to a frequency close to or equal to 1 kHz corresponding to a frequency particularly sensitive to the human ear.
- Each flexible blade can extend from the bottom of the groove or be attached to at least one of the walls defining said groove.
- relatively thin it is meant that each flexible blade is able to flex to open at least partially the section of the groove under the effect of a liquid flow in particular when driving in rainy weather. These same blades remain in the closed position of the groove when driving in dry weather.
- this membrane can flex appropriately under the action the pressure of the water and thus at least partially open the section of the groove to allow the circulation of a sufficient liquid flow.
- 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 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.
- radial direction means in this document any direction which is perpendicular to the axis of rotation of the tire (this direction corresponds to the direction of the thickness of the tread).
- transverse or axial direction means a direction parallel to the axis of rotation of the tire.
- circumferential direction is meant 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.
- axially outwardly we mean a direction which is oriented towards the outside of the internal cavity of the tire.
- Equatorial plane plane perpendicular to the axis of rotation and passing through the points of the axially outermost tire, the equatorial plane dividing the tire into two substantially equal halves.
- the usual conditions of rolling of the tire or conditions of use are those which are 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”.
- 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.
- the tread surface of a tread corresponds to the surface of the strip coming into contact with a self during the rolling of a tire provided with such a band.
- the devices formed of flexible blades described in the prior art - due to the need to be able to bend under a liquid flow - are connected either to the bottom of a groove or to the one of the side walls delimiting a groove.
- JP-H04 221207 A discloses a device having two disjointed blades each blade being fixed to a wall and partly on the bottom of the same groove. There remains between these two blades a space that is not closed and therefore the noise performance can be further improved.
- wall carrying a blade is interpreted in the present document as designating one or the other of the lateral walls delimiting a groove, the blade forming the anti-noise device being integral with each lateral wall as well as from the bottom of the groove.
- the present invention is an improvement of the resonance anti noise devices and aims both to obtain easy molding and demolding of the flexible blades forming the groove closure device and a complete closure of the section of each groove in which these flexible blades are formed.
- the invention relates to a tread for a tire, this tread having a tread surface intended to come into contact with a roadway and comprising at least one groove of width W and depth P delimited by two side walls facing each other, these two side walls being interconnected by a groove bottom, at least one groove having a plurality of closing devices, each closure device being composed of a flexible blade for closing this groove in the rest position according to a closing tau at least equal to 90%, each blade having a thickness E suitable to allow its deformation under the effect of a liquid flow in the groove.
- This tread is such that this flexible blade is secured to the two side walls delimiting the groove and is integral with the bottom of this groove and such that each flexible blade is appropriate dimming 11 e nt me to be able, under the action of a flow of liquid, elastically deform in the groove and to the bottom of said groove to reduce its closure rate of the section of this groove to at most 40%.
- a flexible blade is integral with said walls and bottom of a groove when that the el is fixedly ied to these walls and at the bottom in contrast to leaf springs used in the prior art which are linked at the bottom of a groove or that in one of the walls of a groove.
- leaf springs used in the prior art which are linked at the bottom of a groove or that in one of the walls of a groove.
- closing rate of a flexible blade herein is meant the percentage share of the cross section of the groove provided with such a flexible blade.
- a closing ratio of 100% means that the section is completely closed by the flexible blade.
- the graduat ion of a closure tau at most equal to 40% when the flexible blade is subjected to the act ion of a liquid flow means that 60% o of the sect ion is incpt erte and allows the circulation of this liquid. This percentage is measured when the tire is new, which corresponds to the state wherein the resonance noise generation is the high read.
- the closing ratio when the blade is deformed under the action of a liquid flow is at most 30%> and even more preferably 20%>.
- the closure rate is as small as possible - that is to say closer to 0%> -, so that the performance in taxiing on pavement coated with water is maintained until the end of the wear of the tire corresponding to the wear limit as regulated.
- the flexible strip according to the invention has a length L (h) to a height h which is selected so as to satisfy the following relationship:
- the flexible blade of the anti-noise device is perpendicular to the main direction of the groove (this direction corresponds to the direction of flow of water when driving in rainy weather.
- this height 1 1 corresponds to the length measured between the bottom of the groove and the connection points with the side walls farthest from the groove bottom.
- This noise reducing device can of course be implemented with any type of groove, whether it is a circumferential orientation groove, or transverse or oblique.
- a noise reducing device comprises a blade formed of a central portion and on either side of this central portion of the parts. connecting with the side walls defining the groove, each connecting portion comprising at least one fold.
- any line drawn on a flexible blade and connecting all the points located at the same height h relative to the bottom of the groove has a generic form comprising at least two corrugations.
- Rippling here means a shape away from the straight line connecting the two connection points of the blade with the walls delimiting the groove at height h.
- This ripple can take the form of a succession of segments forming a broken line.
- each flexible blade further ensures elastic return forces to ensure the return of the blade in its closed position of the groove when there is no more liquid flow in said groove .
- the invention further relates to any tire provided with a tread comprising an anti-noise device formed of a flexible blade for closing this groove in the rest position according to a closing ratio of at least 90%. each blade having a thickness E appropriate to allow its deformation under the effect of a liquid flow in the groove.
- Figure 1 shows a variant according to the invention of an anti noise device in the closed state to prevent air circulation
- Figure 2 shows the variant of Figure 1 in a position of partial opening to allow the flow of a liquid
- Figure 3 shows in cross section the groove closed by the closure device according to the variant shown with Figure 1;
- Figure 4 shows in cross section the groove partially open under the effect of a liquid flow as shown in Figure 2;
- Figure 5 shows on the surface a second variant according to the invention of a closure device, this device being formed of a flat central portion and connecting portions with the side walls defining the groove forming folds;
- Figure 6 shows in surface view the second variant of the invention in a deployed position to open the groove section.
- FIG. 1 shows a variant according to the invention of an anti noise device in the closed state to prevent air circulation.
- FIG. 1 shows a groove 2 of generally circumferential orientation formed on a tread 1 of a tire.
- the width W of groove is delimited by side walls 21, 22 of elements in relief, these sidewalls vis-à-vis being connected by a groove base 20.
- This groove has a depth P 2 in the new state , that is to say before any rolling and therefore any wear.
- the tread has a running surface 10 intended to come into contact with the roadway during driving.
- this groove 2 has been formed a plurality of resonance anti noise devices, each device consisting of a flexible rubber blade 3 of the same nature as the material constituting the relief elements of the tread.
- This flexible blade 3 is integral with the side walls 21, 22 defining the groove and the bottom 20 of the groove.
- each flexible strip 3 closes posit ion of rest and in the same condition throughout the groove to prevent any Traffic Emphasis ion air during travel.
- rest position is meant here a condition of the tire unsolicited rolling.
- the flexible blade 3 is dimensionnéc to be able to flex under the action of a pressure generated by a flow of iquide particularly during a running on a roadway covered with water.
- Figure 2 shows the variant of Figure 1 in a posit ion the partial opening to allow the flow of a liquid by a diagrammatically arrow F. In this position, and in the same condition, the section of the groove 2 is partially open (here at least 60% of the section of the groove is open) to allow fluid circulation during running on a roadway covered with water.
- the flexible blade 3 in its open position to allow the circulation of the liquid closes as little as possible the cross section of the groove 2 in which it is placed.
- FIG. 3 shows a cross-sectional view of the groove 2 closed by the closing device according to the variant shown in FIG. 1.
- the flexible blade 3 in its closed position is connected to each side wall 21, 22 delimiting the groove and the bottom 20 of this groove.
- the flexible blade 3 has a total height H which in this case is equal to the depth P of the groove when new.
- This flexible blade has an average thickness equal to 2 millimeters.
- Figure 4 shows a v eu cross section of the groove 2 shown in Figure 3 during a liquid flow into this groove.
- the flexible plate 3 expands into the groove to open the sect ion of the groove.
- Figure 5 shows a view surface of a further variant according to the invention with a closing device of a groove 2 dél imitated by sidewalls 1 February 22 intersecting the tread surface edges and a groove bottom 20 connecting said side walls.
- This closure device is formed by a flexible blade 3 having a central planar portion 31 connected to the bottom 20 of the groove and on either side of this central portion 31 of two connecting parts 32 integrally joining the flexible blade with the side walls delimiting the groove.
- Each part of the line 32 forms two pls 321, 322 substantially parallel to the side walls 21, 22.
- the developed lengths of these connecting portions combined with the length of the central portion are adapted to allow an opening at least partially of the groove under the effect of a flow of liquid.
- FIG. 6 shows a surface view of the tread shown in FIG. 5 in a configuration in which the flexible blade is deployed in the groove to open the section of this groove and allow the circulation of liquid. In this configuration the folds are unfolded so that the blade 3 can be deployed in the groove and at least partially open the section.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1361451A FR3013260A1 (fr) | 2013-11-21 | 2013-11-21 | Dispositif anti bruit ameliore pour pneu |
PCT/EP2014/073486 WO2015074852A1 (fr) | 2013-11-21 | 2014-10-31 | Dispositif anti bruit ameliore pour pneu |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3071427A1 true EP3071427A1 (fr) | 2016-09-28 |
Family
ID=49949918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14796012.4A Withdrawn EP3071427A1 (fr) | 2013-11-21 | 2014-10-31 | Dispositif anti bruit ameliore pour pneu |
Country Status (5)
Country | Link |
---|---|
US (1) | US20160297259A1 (fr) |
EP (1) | EP3071427A1 (fr) |
JP (1) | JP2016537255A (fr) |
FR (1) | FR3013260A1 (fr) |
WO (1) | WO2015074852A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108482020A (zh) * | 2018-05-29 | 2018-09-04 | 江苏大学 | 一种降低轮胎泵吸噪声的胎面花纹沟槽 |
KR102283846B1 (ko) * | 2019-11-12 | 2021-08-03 | 한국타이어앤테크놀로지 주식회사 | 소음 저감형 메인그루브를 갖는 타이어 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05155203A (ja) * | 1991-12-09 | 1993-06-22 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04221207A (ja) * | 1990-12-21 | 1992-08-11 | Bridgestone Corp | 空気入りタイヤ |
DE4403662C2 (de) | 1994-02-05 | 2001-04-19 | Uniroyal Englebert Gmbh | Fahrzeugreifen |
JP4639974B2 (ja) * | 2005-06-07 | 2011-02-23 | 横浜ゴム株式会社 | 空気入りタイヤ |
WO2013001652A1 (fr) * | 2011-06-30 | 2013-01-03 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Bande de roulement de pneumatique |
-
2013
- 2013-11-21 FR FR1361451A patent/FR3013260A1/fr active Pending
-
2014
- 2014-10-31 US US15/037,796 patent/US20160297259A1/en not_active Abandoned
- 2014-10-31 JP JP2016532089A patent/JP2016537255A/ja active Pending
- 2014-10-31 EP EP14796012.4A patent/EP3071427A1/fr not_active Withdrawn
- 2014-10-31 WO PCT/EP2014/073486 patent/WO2015074852A1/fr active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05155203A (ja) * | 1991-12-09 | 1993-06-22 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
Also Published As
Publication number | Publication date |
---|---|
FR3013260A1 (fr) | 2015-05-22 |
WO2015074852A1 (fr) | 2015-05-28 |
US20160297259A1 (en) | 2016-10-13 |
JP2016537255A (ja) | 2016-12-01 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20160621 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN |
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17Q | First examination report despatched |
Effective date: 20170922 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20190412 |