摘要:
The invention relates to a tyre that is intended to be mounted on a vehicle supporting a heavy load, such as a truck, a civil engineering vehicle and/or an aircraft, said tyre comprising a carcass reinforcement whereon is radially mounted a crown reinforcement and a tyre tread. According to the invention, the crown reinforcement (3) comprises at least two plies (31, 32) of metallic reinforcing elements which are mutually parallel in each ply and criss-crossed from one ply to the next, forming an angle of between 10 and 35 DEG with the circumferential direction. Said crown reinforcement also comprises a ply (5) of reinforcing elements at least in each shoulder which are mutually parallel in the ply and which are oriented radially. Moreover, the axially inner edge (51) of said ply (5) is disposed such that it is radially adjacent to at least one edge of one of the plies (30, 31, 32, 33) of the crown reinforcement (3) while the axially outer edge (52) of said ply (5) is radially lower than the edge of the above-mentioned adjacent ply.
摘要:
The invention relates to a tyre P comprising a radial carcass structure which is radially covered by a dome structure consisting of at least two working crown plies formed from metallic reinforcing elements which are crossed from one ply to another, creating angles between 10° and 45° with the circumferential direction, and at least one additional structure formed from circumferentially oriented metallic reinforcing elements. According to the invention, at least one additional layer is radially located on the inside of the working dome layers, the axial width of said additional layer being larger than the width of the axially widest dome layer, and the reinforcing elements of the additional layer are metallic reinforcing elements having a secant module with a 0.7 % extension capacity between 10 and 120 GPa and a maximum tangent module lower than 150 GPa.
摘要:
The invention concerns a tyre P comprising a radial carcass reinforcement (1) radially topped with a crown reinforcement (3) consisting of at least two working crown plies (31, 33) formed by metal reinforcing elements crisscrossed from one ply (31) to the next (33) forming with the circumferential direction angles ranging between 10 and 35 °, and of at least one additional reinforcement (32) consisting of circumferentially oriented metal elements. The invention is characterized in that the additional reinforcement (32) consists of at least two layers (321, 322, 323) of metal elements of compacted diameter not greater than 0.6.
摘要:
A tyre for a heavy civil engineering vehicle allowing the visual detection, in a dark environment, of the stressed areas of the side faces, each end face of the tyre tread (4) being extended radially inwards via an outer face of the sidewall (5), an end face of the tread (4) and the outer face of the sidewall (5) extending it radially inwards forming a side face of the tyre (6). This method comprises a first step of applying a retroreflective coating material (7) onto at least a portion of at least one side face of the tyre (6), allowing the visual detection, in a dark environment, of the portion of at least one side face of the tyre (6), a second step of using the tyre (1) in a mechanically stressful environment, a third step of identifying, in a dark environment, stressed areas (8) of the portion of at least one side face of the tyre (6) that was initially coated with the retroreflective coating material (7) and is lacking said retroreflective coating material (7) due to the mechanical stresses experienced by the tyre (1) during use.
摘要:
The invention relates to a tyre comprising sidewalls connecting a crown portion with beads (1) which are intended to come into contact with a mounting rim (J), said sidewalls comprising a carcass reinforcement (2) which is anchored in each bead (1) to at least one bead core (7) and which has one end (A) in each bead. Viewed in meridian cross-section, the bead core (7) has an external profile comprising two profile parts, namely: a first radially-inner part with axial width L which extends between the axially innermost point (B2) and the axially outermost point (B1), and a second radially-outer part between points B1 and B2. Each bead comprises at least one additional coupling reinforcement (5) which is in contact with the carcass reinforcement (2). The tyre is characterised in that, in each bead viewed in meridian cross-section, (i) the carcass reinforcement (2) is partially wound around the bead core (7) and is such that the end (A) thereof is positioned axially between the end points (B1 and B2) of the radially inner profile part of the bead core (7) and (ii) the additional coupling reinforcement (5) adjoins the carcass reinforcement (2) such as to be wound at least partially around the bead core (7), i.e. such as to cover at least partially the radially outer profile part of said core.