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
  • B60C5/00—Inflatable pneumatic tyres or inner tubes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T152/00—Resilient tires and wheels
  • Y10T152/10—Tires, resilient
  • Y10T152/10495—Pneumatic tire or inner tube

Definitions

• the invention relates to tires and in particular devices for reducing the noise of rolling tires.
• (0002) In order to reduce the noise when running tires on a vehicle, it is known to act in particular on the part of the noise resulting from the vibration of the inflation air contained in the cavity delimited by a tire and its mounting rim (in English: 'tire cavity noise'); for this purpose, it is known to provide the inside of the tire (that is to say the part on which the inflation pressure of the tire is exerted) with foam-based materials or fibers.
• Patent applications JP2006-117115 or JP2004-082787 disclose tire structures in which the inner wall of the tire is coated with a plurality of fibers forming a noise-reducing coating. Although reducing cavity noise, these solutions need to be further improved. In fact, the implementation of these solutions does not make it possible to obtain high densities of fibers.
• An object of the present invention is to provide a solution to this problem, that is to say to propose a tire whose internal cavity of the tire, that is to say the cavity inside of which acts the inflation pressure is provided with fibers in a bulk covering density of said cavity, this coverage density, measured in the vicinity of the wall of the tire delimiting the cavity, being much higher than the usual densities.
• a tire intended for use without a tube this tire comprising a crown provided with a tread intended to come into contact with the roadway during driving, sides extending from and other the top, these flanks being connected to beads intended to be in contact with a tire mounting rim.
• This tire has an inner wall delimiting with the mounting rim an internal cavity to allow inflation of the tire.
• This tire comprises, on at least a portion of its inner wall delimiting the internal cavity, a plurality of elongated protuberances forming a dense coating, this tire being characterized in that these elongate protuberances comprise a plurality of fibers carriers combined with a plurality of branching fibers, said branching fibers being attached to said carrier fibers, each carrier fiber having two ends of which at least one is attached to the inner wall of the tire.
• each carrier fiber is provided with a branching fiber, which makes it possible to obtain fibers of a length greater than that which it is possible to obtain with the methods of the state of the art.
• each carrier fiber is provided with a plurality of branching fibers so as to obtain a much higher volume density than with fibers fixed solely to the inner wall of the carrier. tire.
• the carrier fibers and the branching fibers may be selected from the group consisting of fibers of the following type: nylon, PET, acrylic, cotton, linen, wool and rayon fibers.
• the carrier fibers (60) have a length at least equal to 0.5 mm and at most equal to 10 mm, and a diameter of between 0.01 mm and 0.5 mm.
• the number of carrier fibers is at least equal to 5 and at most 100 per unit area expressed in mm.
• the method which has just been described makes it possible effectively to place on the surface of a cavity of any body (and in particular a tire) a plurality of fibers to occupy a high density.
• the method according to the invention comprises the following steps:
• This last operation can be repeated as many times as necessary.
• the carrier fibers may be of rubber material, this material may or may not be of the same nature as the inner liner.
• the branching fibers may be identical or different from the carrier fibers.
• the carrier or branching fibers have a length ranging from 0.5 mm to 20 mm and have a diameter ranging from 0.5 mm to 5 mm.
• the number of carrier fibers per unit area expressed in millimeters squared is between 0.1 to 5.
• Figure 1 shows in section a tire according to the invention provided on its inner surface with a plurality of carrier fibers on which are bonded branching fibers;
• FIG. 2 shows an enlargement of a carrier fiber as used in the tire variant of Fig. 1;
• Figure 3 shows a comparison of sound levels recorded between different tires showing the interest of the tires according to the invention;
• Figure 4 shows an alternative embodiment of protuberances for covering the inside of a tire
• Figure 5 shows the implementation of the flocking process for bonding branching hairs to the bristles to lengthen the bristles;
• Figure 6 shows the implementation of the flocking process according to which a plurality of branching hairs is combined with a carrier hair.
• FIG. 1 shows a meridian section of a tire 1 according to the invention
• the tire 1 comprises a crown 3 provided radially outwardly with a tread 31 intended to come into contact with the roadway during the rolling of the tire. Axially on either side of this vertex 3, the tire comprises flanks 4 connecting this vertex to beads 5 whose function is to ensure contact with the mounting rim 2.
• the inner wall 10 of the tire delimits with the outer wall of the mounting rim 2 a cavity 100 for receiving an inflation gas at a given pressure corresponding to the wear pressure of the tire. To achieve a good seal, the inner wall 10 of the tire 1 is, in known manner, covered with a rubber gasket rubber gas-tight composition.
• the tire 1 according to the invention comprises, on its inner wall 10 and in a limited region 11 corresponding to the top of the tire, a damping structure to reduce the noise of rolling cavity.
• This structure according to the invention is formed by a plurality of protuberances 6 of elongate shape, these protuberances comprising a plurality of carrier fibers 60 and a plurality of branching fibers 61, said branching fibers 61 being fixed to the carrier fibers 60 or even to other branching fibers.
• the carrier fibers 60 are made of nylon and have an average length equal to 3 mm. These carrier fibers 60 are fixed on the inner wall 10 of the tire by a "flocking" process that can be described as follows: after deposition of a glue composition on the inner wall of the tire tire and more precisely on the region concerned, this glue, the tire and the carrier fibers are subjected to an electric field generating a large electrical potential difference between said fibers and the inner wall of the tire. In this way, the carrier fibers are projected onto the inner wall according to a determined density. Then, a similar operation is performed between the carrier fibers and branching fibers which are here chosen identical to the carrier fibers.
• the carrier fibers are sprayed with a tacky composition in order to be able to bond the branching fibers to said carrier fibers.
• the average lengths of the carrier fibers and the branching fibers are substantially identical and equal to 3 mm.
• This latter operation could be further renewed to substantially increase the filling density / volume coverage of fibers (whether carrier or branching) so as to increase the cushioning effect of the vibrations of the inflation air in the cavity during rolling.
• the diameter of the branching fibers is substantially identical to that of the carrier fibers and equal to 50 microns in diameter.
• branching fibers When it is desired to put a high density of branching fibers, it is recommended to choose branching fibers of substantially smaller section than the carrier fibers and to ensure that each carrier fiber is 1 to 10 (or more) branching fibers.
• the glue spraying and then branching operation can be repeated after setting up a first series of branching fibers: in this case, the new branching fibers are connected to carrier fibers and to branching fibers. already in place.
• the length of the fibers carriers is greater than that of the branching fibers.
• certain branching fibers 61 bonded to the carrier fiber 60 are themselves provided with branching fibers 611 which makes it possible to increase the volume density of filling in protuberances 6 in the vicinity of the inner wall of the tire.
• the number of carrier fibers per unit area expressed in mm 2 is at least 0.1 and even more preferably greater than 0.5 fibers per mm 2 .
• FIG. 3 shows measurement results obtained with a tire according to the invention (as shown and described with the support of FIG. 1) in comparison with a tire coated with unbranched fibers (these fibers corresponding to the fibers carriers of the tire of the invention).
• the dimension of the tire is 215/55 R 17.
• the curve A corresponds to the reference tire of the same dimension without any coating
• that marked by the index B corresponds to the tire with unbranched fibers
• the curve marked by the index C corresponds to the tire according to the invention.
• the interior noise of a vehicle equipped with four identical tires is measured. The rolling is done at a speed of 40 km / h on a pavement with a coating capable of generating a cavity noise in the tire.
• the interior noise is measured in the vehicle.
• the peak frequency of 214 Hz corresponds to that of the cavity noise.
• the decrease of the cavity noise is observed by a decrease of the sound intensity at this frequency:
• the tire according to the invention allows a gain of 4.9 dBA relative to the reference tire without any internal lining and 2.6 dBA compared to a tire provided with a coating composed of unbranched fibers.
• a carrier fiber 60 is extended by a first branching fiber 61, itself extended by a second branching fiber 62.
• all the carrier and branching fibers used are identical. Thus, it is possible to obtain a large protrusion length using successively several times the same method of fixing the fibers (carriers and branching).
• FIG. 5 shows the implementation of the flocking process in which the bristles 402 are extended by a branching hair 403 of dimensional characteristics identical to that of the bristles.
• This implementation makes it possible to produce protuberances of the type shown in FIG. 4.
• a body 400 is covered on a surface with an adhesive 401 for fixing bristles. Bearing bristles 402 are subjected to a high negative electrical charge while body 400 and glue 401 are subjected to a high positive electrical charge (Fig. 5.1). Under the action of these loads, the bristles 402 are released and projected on the glued surface of the body 400 ( Figure 5.2).
• the density of the bristles 402 is between 2 and 50 bristles per millimeter squared surface of the body 400 (inclusive).
• a second step (Fig. 5.3) branching fibers 403 are projected onto the carrier fibers in place on the body 400 by subjecting these branching fibers to a strong negative electrical charge while the body 400, the glue 401 and the 402 carrier fibers are subjected to a strong positive electrical charge.
• FIG. 5.4 shows the surface of the body 400 covered with carrying bristles 402 extended by branching bristles 403.
• the glue 401 used for gluing bristles 402 and branching bristles 403 is an epoxy resin or preferentially a soluble glue with water to mitigate the increase in stiffness due to the bonding of the branching hairs 403 on the bristles 402.
• the cavities formed on the tread can be provided with the same type of elongate protuberances formed by at least one carrier fiber to which at least one branching fiber is attached.
• the fibers described so far have a circular or substantially circular section: the invention is in no way limited to this specific form and any other form can be used in an equivalent manner.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tires In General (AREA)
• Tyre Moulding (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39456503

Family Applications (1)

Country Status (9)

Cited By (4)

Families Citing this family (10)

Citations (5)

Family Cites Families (8)

• 2007
  • 2007-10-24 FR FR0758543A patent/FR2922816B1/fr not_active Expired - Fee Related
• 2008
  • 2008-10-21 CN CN200880112495XA patent/CN101835637B/zh not_active Expired - Fee Related
  • 2008-10-21 JP JP2010530425A patent/JP5453282B2/ja not_active Expired - Fee Related
  • 2008-10-21 EA EA201070507A patent/EA016536B1/ru not_active IP Right Cessation
  • 2008-10-21 WO PCT/EP2008/064196 patent/WO2009053352A1/fr not_active Ceased
  • 2008-10-21 BR BRPI0817966 patent/BRPI0817966A2/pt not_active IP Right Cessation
  • 2008-10-21 EP EP08842677A patent/EP2212127B1/fr not_active Ceased
  • 2008-10-21 US US12/739,465 patent/US9045006B2/en not_active Expired - Fee Related
  • 2008-10-21 AT AT08842677T patent/ATE512007T1/de not_active IP Right Cessation

Patent Citations (5)

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