# US 2018/0022159 A1 · Radial tire having a very thin belt structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022159 A1 - Document ID: US20180022159A1 - Status: Published application - Kind: A1 - Application number: 15/547,986 - Filed: 2016-01-22 - Published: 2018-01-25 - Earliest claimed: 2015-02-03 - Assignees: Compagnie Generale Des Etablissements Michelin - Applicants: Compagnie Generale Des Etablissements Michelin - Inventors: CAMILLE ASTAIX; AURORE LARDJANE - Web page: https://patentgrep.com/patent/US20180022159A1 ## CPC - B60C 9/2003: {characterised by the materials of the belt cords} - B60C 9/0042: {Reinforcements made of synthetic materials} - B60C 9/005: {Reinforcements made of different materials, e.g. hybrid or composite cords} - B60C 9/0064: {Reinforcements comprising monofilaments} - B60C 9/2009: {comprising plies of different materials} - D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)} - B60C 2009/2016: {comprising cords at an angle of 10 to 30 degrees to the circumferential direction} - B60C 2009/2067: {Thickness} - B60C 2009/2077: {Diameters of the cords; Linear density thereof} - B60C 2009/2083: {Density in width direction} - B60C 2009/2096: {Twist structures} - B60C 2009/2257: {Diameters of the cords; Linear density thereof} - D10B 2331/02: polyamides (D10B2331/08 takes precedence) - D10B 2331/04: polyesters, e.g. polyethylene terephthalate [PET] - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS - D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES ## Abstract A radial tire, notably for a passenger vehicle or van, has a very thin belt structure comprising a multilayer composite laminate of specific construction, with a first layer of rubber reinforced by circumferential textile reinforcers in the form of monofilaments or assemblies of monofilaments, preferably slightly heat-shrinkable, for example made of nylon or of polyester, this first layer radially (in the direction Z) surmounting two other layers of rubber, reinforced by high-strength steel monofilaments. The mean thickness of rubber, measured in the radial direction (Z), separating a first reinforcer from the second reinforcer which is closest to it, and that separating a second reinforcer from the third reinforcer which is closest to it, are both less than or at most equal to 0.35 mm. ## Claims ### Claim at position 1 -18. (canceled) ### Claim 19 A radial tire, defined in three main directions, circumferential, axial and radial, comprising a crown surmounted by a tread, two sidewalls, two beads, each sidewall connecting each bead to the crown, a carcass reinforcement that is anchored in each of the beads and extends in the sidewalls as far as the crown, a belt that extends in the crown in the circumferential direction and is situated radially between the carcass reinforcement and the tread, said belt comprising a multilayer composite laminate comprising at least three superposed layers of reinforcers, said reinforcers being unidirectional within each layer and embedded in a thickness of rubber, respectively, wherein, on a tread side, a first layer of rubber comprises a first row of reinforcers, said reinforcers being first reinforcers, which are oriented at an angle α of −5 to +5 degrees with respect to the circumferential direction and made of a heat-shrinkable textile material; wherein, in contact with the first layer of rubber and disposed beneath the first layer of rubber, a second layer of rubber comprises a second row of reinforcers, said reinforcers being second reinforcers, which are oriented at a given angle β, which is positive or negative, of between 10 and 30 degrees with respect to the circumferential direction and are metal reinforcers; wherein, in contact with the second layer of rubber and disposed beneath the second layer of rubber, a third layer of rubber comprises a third row of reinforcers, said reinforcers being third reinforcers, which are oriented at an angle γ, the opposite of the angle β, itself being between 10 and 30 degrees with respect to the circumferential direction and are metal reinforcers; wherein the first reinforcers made of heat-shrinkable textile material are monofilaments with a diameter φ greater than 0.10 mm or assemblies of such monofilaments; wherein an envelope diameter D1 of the first reinforcers is between 0.20 mm and 1.20 mm; wherein the second reinforcers and third reinforcers are steel monofilaments with a diameter, respectively D2 and D3, of between 0.20 mm and 0.50 mm; and wherein, measured in a central part of the belt in the vulcanized state on either side of a median plane over a total axial width of 10 cm, a mean thickness Ez1 of rubber separating a first reinforcer from a second reinforcer which is closest to it, measured in the radial direction, is less than or equal to 0.35 mm and a mean thickness Ez2 of rubber separating a second reinforcer from a third reinforcer which is closest to it, measured in the radial direction, is less than or equal to 0.35 mm. ### Claim 20 (depends on 19) The tire according to claim 19, wherein the diameter φ is between 0.15 and 0.80 mm. ### Claim 21 (depends on 20) The tire according to claim 20, wherein the diameter φ is between 0.20 and 0.60 mm. ### Claim 22 (depends on 19) The tire according to claim 19, wherein D1 is between 0.30 and 1.00 mm. ### Claim 23 (depends on 22) The tire according to claim 22, wherein D1 is between 0.40 and 0.80 mm. ### Claim 24 (depends on 19) The tire according to claim 19, wherein a density d1 of the first reinforcers, measured in the axial direction, is between 70 and 130 threads/dm. ### Claim 25 (depends on 24) The tire according to claim 24, wherein the density d1 is between 80 and 120 threads/dm. ### Claim 26 (depends on 25) The tire according to claim 25, wherein the density d1 is between 90 and 110 threads/dm. ### Claim 27 (depends on 19) The tire according to claim 19, wherein D2 and D3 are each greater than 0.25 mm and less than 0.40 mm. ### Claim 28 (depends on 27) The tire according to claim 27, wherein D2 and D3 are each in a range from 0.28 to 0.35 mm. ### Claim 29 (depends on 19) The tire according to claim 19, wherein densities, d2 and d3, respectively, of the second and third reinforcers respectively, measured in the axial direction, is between 100 and 180 threads/dm. ### Claim 30 (depends on 29) The tire according to claim 29, wherein the densities d2 and d3 are each between 110 and 170 threads/dm. ### Claim 31 (depends on 30) The tire according to claim 30, wherein the densities d2 and d3 are each between 120 and 160 threads/dm. ### Claim 32 (depends on 19) The tire according to claim 19, wherein a thermal contraction CT of the first reinforcers made of heat-shrinkable textile material, after 2 mins at 185° C., is less than 7.5%. ### Claim 33 (depends on 32) The tire according to claim 32, wherein the CT is less than 7.0%. ### Claim 34 (depends on 33) The tire according to claim 33, wherein the CT is less than 6.0%. ### Claim 35 (depends on 19) The tire according to claim 19, wherein Ez1 is between 0.10 and 0.30 mm. ### Claim 36 (depends on 35) The tire according to claim 35, wherein EZ1 is between 0.15 mm and 0.30 mm. ### Claim 37 (depends on 19) The tire according to claim 19, wherein Ez2 is between 0.15 and 0.35 mm. ### Claim 38 (depends on 37) The tire according to claim 37, wherein EZ2 is between 0.25 mm and 0.35 mm. ### Claim 39 (depends on 19) The tire according to claim 19, wherein the following inequality is satisfied: 0.15