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Tire reinforced by hybrid cablesRelated Patent Categories: Resilient Tires And Wheels, Tires, Resilient, Pneumatic Tire Or Inner Tube, Multiple Chamber, Annular Chambers, Mutually Free WallsTire reinforced by hybrid cables description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070169867, Tire reinforced by hybrid cables. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a divisional of application Ser. No. 10/877,364, filed Jun. 25, 2004, which is a continuation of International Application No. PCT/EP 03/00311, filed Jan. 15, 2003, published in French with an English Abstract on Jul. 24, 2003 under PCT Article 21(2) as WO 03/060212, which claims priority to French Patent Application No. 02/00571, filed Jan. 17, 2002. FIELD OF THE INVENTION [0002] The present invention relates to a tire reinforced by hybrid cables and a mounted assembly which incorporates a composite fabric. BACKGROUND OF THE INVENTION [0003] The development of tires intended to be fitted on passenger vehicles of the type which travel at high speeds has given rise to increasingly high-performance architectures being developed for these tires. [0004] One solution conventionally used for these "high-speed" tire architectures consists of covering the working crown plies of these tires, which comprise metallic or textile reinforcement elements, with what is called a hooping crown ply, usually reinforced by textile cables. This hooping crown ply, which is for example arranged radially to the outside of the crown reinforcement of the tire, is in particular characterized in that the cables which reinforce it are arranged in a spiral at an angle of 0.degree. or close to 0.degree. with the median circumferential plane of the tire. It is also known to arrange relatively narrow strips or plies at an angle of approximately 0.degree. instead of the aforementioned cables, in order to fulfill a hooping function of the crown reinforcement. [0005] Hybrid cables of plied-yarn type, which are formed of two threads based on materials of low and high initial moduli respectively which are twisted together, in order to impart to the cable thus obtained a tensile modulus which is reduced at low deformation and on the contrary high at high deformation have in the past been tested as textile cables for hooping crown plies. This decoupling of the tensile moduli of the cable results in the presence of a transition point on the force/elongation curve of said cable, and it is for example obtained using a polyamide 6,6 for the material of low modulus and aramid for the material of high initial modulus. [0006] For the description of such hybrid cables, reference may be made to US patent specification U.S. Pat. No. 3,977,172 and to the proceedings of the conference Kautschuk+Gummi Kunststoffe, vol. 40, No. 2, February 1987, pages 130-135, in Heidelberg (Germany), E. R. Barron, entitled "Hybrid tire cords containing kevlar.RTM. aramid". [0007] One major drawback of these hybrid cables having a plied-yarn structure is the excessive hooping tension of the ply comprising these cables, including at reduced speeds typically less than 120 km/h, (i.e., at relatively low deformations). This tension or premature "stiffening" of the cables results in a running noise due to the tire which is significant at these speeds, which represents a significant source of discomfort for the occupants of the vehicle. SUMMARY OF THE INVENTION [0008] One object of the present invention is to overcome this drawback, and it is achieved in that the Applicants have recently surprisingly obtained hybrid cables each having a ratio of final tangent modulus:initial tangent modulus greater than 10, which makes it possible for example to reinforce a hooping crown ply of a tire such that: [0009] at reduced deformations inherent at a speed of travel of less than 100 or 120 km/h, the hooping crown ply produces reduced running noise, and that [0010] at high deformations inherent at a speed of travel typically greater than 120 km/h, this crown ply performs its hooping function satisfactorily. [0011] It will be noted that the value of the ratio of final tangent modulus:initial tangent modulus which characterizes the hybrid cables according to the invention is greater than those of the same ratios which characterize the hybrid cables obtained to date, which are always less than 10. [0012] Advantageously, this ratio is greater than 12 for the hybrid cables according to the invention, and it is for example between 12 and 30. [0013] It will be noted that the present invention is in no way limited to use in a hooping crown ply of these hybrid cables, and that it covers any use in tires which may be of passenger-vehicle type or intended to bear heavy loads, for example heavy-vehicle tires, or tires for agricultural or construction machinery. [0014] It will also be noted that the hybrid cables according to the invention make it possible to improve the endurance at high speed (typically greater than 120 km/h) of the crown reinforcement of tires the hooping crown ply of which is reinforced by these cables. [0015] "Hybrid cable" is understood in the present description to mean a composite cable, i.e., one constituted of at least two materials of different natures and/or properties. [0016] Initial tangent modulus" of the hybrid cable according to the invention is understood in the present description to mean the slope of the tangent to the force/elongation curve of this cable corresponding to a zero elongation. "Final tangent modulus" of this hybrid cable is understood to mean the slope of the tangent to the force/elongation curve of said cable for an elongation corresponding to the breaking thereof. [0017] It will be noted that the hybrid cables according to the invention each have a force/elongation curve which is very close to the trace of the aforementioned tangents to this curve corresponding respectively to a zero elongation and to the breaking of the cable, which results in decoupling of the tangent moduli of said cable at low and high deformations (i.e., at travelling speeds which are reduced and high respectively). [0018] According to a preferred embodiment of the invention, said hybrid cables are of the wrapped type, comprising a textile core of an initial modulus of less than 900 cN/tex and a textile wrap of an initial modulus greater than 1300 cN/tex which is wound on said core. [0019] "Initial modulus" of the core or the wrap is understood in the present description to mean the tensile modulus at low deformation of each of these constituents which has first been extracted from the wrapped hybrid cable. This initial modulus is defined as being the slope of the linear part of the force/elongation curve of the core or of the wrap in the raw state, measured just after a standard initial tension of 0.5 cN/tex. [0020] Said initial moduli and said tangent moduli, as well as all the mechanical properties in extension mentioned in the present description (tenacity, elongation at break, in particular) are measured in known manner by means of measurements of force (daN)/elongation (%) type, carried out by means of an "INSTRON" machine with "4D" grippers and using the following operating parameters: Continue reading about Tire reinforced by hybrid cables... Full patent description for Tire reinforced by hybrid cables Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Tire reinforced by hybrid cables patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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