# US 2021/0078366 A1 · Aircraft tire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0078366 A1 - Document ID: US20210078366A1 - Status: Published application - Kind: A1 - Application number: 16/772,640 - Filed: 2018-11-21 - Published: 2021-03-18 - Earliest claimed: 2017-12-13 - Assignees: Bridgestone Corporation - Applicants: Bridgestone Corporation - Inventors: Kiichiro SUZUMORI - Web page: https://patentgrep.com/patent/US20210078366A1 ## CPC - B60C 9/08: the cords extend transversely from bead to bead, i.e. radial ply (B60C9/07 takes precedence) - B60C 15/0018: {not folded around the bead core, e.g. floating or down ply} - B60C 15/0027: {with low ply turn-up, i.e. folded around the bead core and terminating at the bead core} - B60C 15/0628: {comprising a bead reinforcing layer} - D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)} - B60C 2015/0639: {between carcass main portion and bead filler not wrapped around the bead core} - B60C 2015/0642: {between carcass turn-up and bead filler not wrapped around the bead core} - B60C 2015/065: {at the axially outer side of the carcass turn-up portion not wrapped around the bead core} - B60C 2015/0685: {Physical properties or dimensions of the cords, e.g. modulus of the cords} - B60C 2015/0692: {characterised by particular materials of the cords} - B60C 2200/02: for aircrafts - 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 ## Abstract Provided is an aircraft tire which has both satisfactory light weight and satisfactory separation durability of carcass ply ends. An aircraft tire (10) includes a pair of bead cores (1), and a carcass (2) extending between the pair of the bead cores (1). In this aircraft tire (10), the carcass (2) includes at least one layer of a turn-up ply (2a) which is composed of a main body (2aa) and folded portions (2ab), and at least one layer of a down ply (2b) which covers a tire width-direction outer side of the respective folded portions (2ab) of the turn-up ply (2a) and extends to at least a tire radial-direction inner side of the respective bead cores (1); rubber-cord reinforcing members (6) are each arranged between the main body (2aa) of an outermost turn-up ply (2a) and the folded portion (2ab) of the turn-up ply (2a) extending to a tire radial-direction outermost side, and between the folded portion (2ab) of the turn-up ply (2a) extending to the tire radial-direction outermost side and an innermost down ply (2b); and cords of the rubber-cord reinforcing members (6) have an elongation at break of not less than 30%. ## Claims ### Claim 1 An aircraft tire comprising: a pair of bead cores; and a carcass extending between the pair of the bead cores, wherein the carcass comprises: at least one layer of a turn-up ply, which is composed of a main body extending between the bead cores, and folded portions that are folded and extend around the respective bead cores from a tire width-direction inner side to an outer side; and at least one layer of a down ply, which covers a tire width-direction outer side of the respective folded portions of the turn-up ply and extends to at least a tire radial-direction inner side of the respective bead cores, rubber-cord reinforcing members are each arranged between the main body of a tire width-direction outermost turn-up ply and the folded portion of a turn-up ply extending to a tire radial-direction outermost side, and between the folded portion of the turn-up ply extending to the tire radial-direction outermost side and a tire width-direction innermost down ply, and cords of the rubber-cord reinforcing members have an elongation at break of not less than 30%. ### Claim 2 (depends on 1) The aircraft tire according to claim 1, wherein the cords of the rubber-cord reinforcing members have a total fineness of 100 to 1,000 dtex. ### Claim 3 (depends on 1) The aircraft tire according to claim 1, wherein the cords of the rubber-cord reinforcing members have an elongation at break of 30% to 45%. ### Claim 4 (depends on 1) The aircraft tire according to claim 1, wherein the cords of the rubber-cord reinforcing members have a final twist coefficient of 0.25 to 0.60. ### Claim 5 (depends on 1) The aircraft tire according to claim 1, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 6 (depends on 2) The aircraft tire according to claim 2, wherein the cords of the rubber-cord reinforcing members have an elongation at break of 30% to 45%. ### Claim 7 (depends on 2) The aircraft tire according to claim 2, wherein the cords of the rubber-cord reinforcing members have a final twist coefficient of 0.25 to 0.60. ### Claim 8 (depends on 2) The aircraft tire according to claim 2, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 9 (depends on 3) The aircraft tire according to claim 3, wherein the cords of the rubber-cord reinforcing members have a final twist coefficient of 0.25 to 0.60. ### Claim 10 (depends on 3) The aircraft tire according to claim 3, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 11 (depends on 4) The aircraft tire according to claim 4, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 12 (depends on 6) The aircraft tire according to claim 6, wherein the cords of the rubber-cord reinforcing members have a final twist coefficient of 0.25 to 0.60. ### Claim 13 (depends on 6) The aircraft tire according to claim 6, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 14 (depends on 7) The aircraft tire according to claim 7, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 15 (depends on 9) The aircraft tire according to claim 9, wherein the cords of the rubber-cord reinforcing members are made of nylon. ### Claim 16 (depends on 12) The aircraft tire according to claim 12, wherein the cords of the rubber-cord reinforcing members are made of nylon.