# US 2014/0150950 A1 · Bead for a tire for a heavy civil-engineering vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150950 A1 - Document ID: US20140150950A1 - Status: Published application - Kind: A1 - Application number: 14/125,080 - Filed: 2012-06-06 - Published: 2014-06-05 - Earliest claimed: 2011-06-07 - Assignees: Compagnie Generale Des Establissements Michelin - Inventors: Olivier Ferlin; François Harle - Web page: https://patentgrep.com/patent/US20140150950A1 ## CPC - B60C 15/04: Bead cores - B60C 15/06: Flipper strips, fillers, or chafing strips {and reinforcing layers for the construction of the bead} - B60C 15/0607: {comprising several parts, e.g. made of different rubbers} - B29D 30/06: Pneumatic tyres or parts thereof {(e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)} - B60C 2015/009: {Height of the carcass terminal portion defined in terms of a numerical value or ratio in proportion to section height} - B60C 2200/065: for construction vehicles - Y10T 152/10819: Characterized by the structure of the bead portion of the tire - Y10T 152/10846: Bead characterized by the chemical composition and or physical properties of elastomers or the like - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to improving the endurance of a bead of a radial tire for a heavy vehicle of construction plant type by reducing the compression to which the turn-up is subjected when the tire is driven on. According to the invention, for a tire for a heavy vehicle of construction plant type comprising two beads intended to come into contact with a rim having two rim flanges, a carcass reinforcement comprising at least one carcass reinforcement layer having a main part wrapped, within each bead, from the inside towards the outside of the tire, around a bead wire of substantially circular meridian section, to form a turn-up, a filling element extending the bead wire radially towards the outside and axially separating the main part and the turn-up, the distance (d) between a first segment of turn-up and the main part decreasing continuously, radially towards the outside, from the bead wire as far as a minimum distance (d1), the distance (d2) between a second segment of turn-up, extending the first segment of turn-up radially towards the outside, and the main part is substantially constant and equal to the minimum distance (d1) between the first segment of turn-up and the main part. ## Claims ### Claim 1 A tire for a heavy vehicle of construction plant type comprising two beads intended to come into contact with a rim having two rim flanges, a carcass reinforcement comprising at least one carcass reinforcement layer having a main part wrapped, within each bead, from the inside towards the outside of the tire, around a bead wire of substantially circular meridian section, to form a turn up, a filling element extending the bead wire radially towards the outside and axially separating the main part and the turn-up, the distance (d) between a first segment of the turn-up and the main part decreasing continuously, radially towards the outside, from the bead wire as far as a minimum distance (d1), wherein the distance (d2) between a second segment of the turn-up, extending the first segment of the turn-up radially towards the outside, and the main part is substantially constant and equal to the minimum distance (d1) between the first segment of the turn-up and the main part. ### Claim 2 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein the substantially constant distance (d2) between the second segment of the turn-up and the main part is at most equal to the diameter (L1) of the substantially circular meridian section of the bead wire divided by 4. ### Claim 3 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein a radial distance (HA) between a radially innermost point A of the second segment of the turn-up and an axial straight line (S) positioned radially at a nominal diameter (D) of a rim is at least equal to a radial height (H) of a rim flange. ### Claim 4 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein a radial distance (HA) between a radially innermost point A of the second segment of the turn-up and an axial straight line (S) positioned radially at a nominal diameter (D) of a rim is at most equal to 2 times, the radial height (H) of a rim flange. ### Claim 5 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein a difference between a radial distance (HB) between a radially outermost point B of the second segment of the turn-up and an axial straight line (S) positioned radially at a nominal diameter (D) of a rim, and a radial distance (HA) between a radially innermost point A of the second segment of the turn-up and an axial straight line (S) positioned radially at the nominal diameter (D) of the rim is at most equal to a radial height (H) of a rim flange. ### Claim 6 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein the distance (d) between a third segment of the turn-up extending the second segment of the turn-up radially outwards, and the main part reaches a maximum distance (d3) at a point C on the third segment of the turn up. ### Claim 7 (depends on 6) The tire for a heavy vehicle of construction plant type according to claim 6, wherein the maximum distance (d3) between the third segment of the turn-up and the main part is at least equal to 1.2 times, the distance (d2) between the second segment of the turn-up and the main part. ### Claim 8 (depends on 6) The tire for a heavy vehicle of construction plant type according to claim 6, wherein a point C of the third segment of the turn-up at which the maximum distance (d3) between the third segment of the turn-up and the main part is reached is a radially outermost point E of the turn up. ### Claim 9 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein the carcass reinforcement layer made up of reinforcing elements coated in a polymer coating material, and wherein the filling element has a filling element segment contained axially between the second segment of the turn-up and the main part, made of a polymer filling material, wherein the polymer filling material of the segment of filling element contained axially between the second segment of the turn-up and the main part is identical to the polymer coating material of the carcass reinforcement layer. ### Claim 10 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein a radial distance (HE) between a radially outermost point E of the turn-up, and an axial straight line (S) positioned radially at a nominal diameter (D) of a rim is at least equal to 0.8 times a radial distance (HF) between an axially outermost point F of the main part and an axial straight line (S) positioned radially at the nominal diameter (D) of the rim. ### Claim 11 (depends on 1) The tire for a heavy vehicle of construction plant type according to claim 1, wherein the bead wire is made of a circumferential reinforcing element surrounded by a polymer coating element, and wherein a minimum thickness (e) of the polymer coating element of the bead wire is at least equal to 0.04 times the diameter (L2) of a meridian section of the circumferential reinforcing element of the bead wire. ### Claim 12 (depends on 2) The tire for a heavy vehicle of construction plant type according to claim 2, wherein (d2) is at most equal to (L1) divided by 6. ### Claim 13 (depends on 4) The tire for a heavy vehicle of construction plant type according to claim 4, wherein (HA) is at most equal to 1.2 times (H). ### Claim 14 (depends on 7) The tire for a heavy vehicle of construction plant type according to claim 7, wherein (d3) is at least equal to 2 times (d2).