摘要:
A tire tread, comprising a tread pattern formed of groups of motifs arranged, in the transverse direction, in a number M of distributions at least equal to two and of average width Li, Lj, the total of the widths Li, Lj being at least equal to 80% of the width L of the tread, each distribution of groups of motifs being formed by a succession of a plurality of groups, at least two of said groups of motifs of the distribution in question having different longitudinal lengths, the ratio Ri between the longitudinal length of the smallest group of motifs and the largest group of motifs being strictly less than one, this tread being characterized in that for at least two distributions comprising respectively Ni and Nj motifs, with Ni
摘要:
Processes and machines for the unseating test for a mounted assembly, wherein, on the machine, the test (or “load”) forces are transmitted only in a normal direction, that is to say by that part of the tire intended to be in contact with the ground, that is to say under normal conditions the “crown” of the tire (substantially the tread) and, under extreme test conditions, the crown, the “shoulder” and ultimately the “sidewall” of the tire. Operation may be in static mode (wheel on a test plate) or in dynamic mode (wheel rolling with drift on a test drum or other test surface).
摘要:
A bicycle tire comprises a toothset (5) of substantially radial generatrix (G), positioned to collaborate with a complementary toothset of a driving pinion of an electrical assistance device. The toothset (5) has teeth (51) that are equidistant by a pitch p, each tooth having a length l, in the direction of the generatrix (G), and a substantially triangular section, in a plane perpendicular to the generatrix (G), of height h. Each tooth (51) comprises an elastomeric material having an elastic shear modulus G* at least equal to a threshold elastic shear modulus G*s, G*s being such that the displacement d of the crest of each tooth is equal to 0.2 times the height h of the tooth under the action of a uniform pressure, applied by the complementary toothset to the side that forms the smallest angle, equal to 650/(l×h×(2.67−0.33×p)).
摘要:
A polyurethane that is a reaction product of reaction components, the reaction components comprising (a) a polyol; (b) a polyisocyanate selected from an aromatic, alicyclic or aliphatic polyisocyanate or combinations thereof; (c) a mixture of chain extenders that includes (i) a chain extender having a sulfur bridge in an amount of between 1 and 30 weight percent of the total mixture of claim extenders and (ii) a main chain extender, wherein the chain extender having a sulfur bridge. The chain extender having a sulfur bridge may be characterized as R1-A-Sx—B—R2 wherein R1 and R2 are selected from an OH, an NH2 or combinations thereof, A and B are selected from a divalent aliphatic, alicyclic or aromatic organic group or combinations thereof, A and B may be the same or different and x is an integer of between 2 and 10.
摘要:
Rolling assembly E comprising a tire 1 with at least two beads 11, a substantially cylindrical rim J, a collar 2 made of a polymeric material with two axial edges each reinforced by at least one ring, and between the said edges, a central portion reinforced by at least one armature of reinforcement elements such that the said portion is sufficiently flexible to allow the radial displacement of a blocking element which acts in concert with the complementary element of the same name of the rim J of axial width W, in which the reinforcement of each edge of the collar 2 is a collar hook 21 with a seat 210 and a flange 211, the said hooks 21, seats 210 and flanges 211 being similar to the rim hooks, seats and flanges with radial and axial dimensions in accordance with the standards in force, the width W of the rim being smaller than the axial distance L separating the axially inside ends of the seats 210 of the collar 2.
摘要:
The invention relates to a method for preparing a silica/diene elastomer masterbatch, comprising the following successive steps: doping the silica with an at least divalent metallic element; preparing at least one dispersion of the resulting doped silica in water; bringing a diene elastomer latex into contact with the aqueous doped-silica dispersion and mixing them together so as to obtain a coagulum; recovering the coagulum; and drying the recovered coagulum so as to obtain the masterbatch.
摘要:
Rubber composition based on at least one diene elastomer, a polymeric filler as reinforcing filler and a coupling agent for bonding between the polymeric filler and the elastomer. The polymeric filler includes nanoparticles of a polyvinylaromatic (PVAr) carrying a functional group denoted by Z of formula a ≡Si—X, X representing a hydroxyl or hydrolyzable group. The PVAr is especially a copolymer of styrene, ethylvinylbenzene, divinylbenzene and trimethoxysilylpropylacrylate or trimethoxysilylpropylmethacrylate, being in the form of nanobeads, the diameter of which is between 10 and 100 nm. Also described is a method of obtaining such a composition, and use of such a rubber composition for the manufacture of rubber articles, in particular tires or rubber semi-finished products intended for these tires, as well as a masterbatch including at least one diene elastomer and such a polymeric filler, and a method of obtaining such a masterbatch.
摘要:
Tire including at least one carcass reinforcement of at least one ply anchored in each bead B to at least one bead wire, each bead being reinforced by at least two reinforcement plies formed of reinforcing elements inclined relative to the circumferential direction at an angle between 10null and 30null, said reinforcement plies being axially adjacent to the carcass ply wherein the reinforcing elements of at least one ply of the carcass reinforcement, in each part adjacent to the two bead reinforcement plies, are inclined relative to the circumferential direction at an angle between 50null and 80null and are radial in the part located between the radially upper ends of said two reinforcement plies, said ends being located radially outside the sidewall points that define the maximum axial width of the tire when mounted on its intended wheel rim and inflated.
摘要:
Methods for determining the resonant frequency for interrogation of a resonant device include steps for generating and transmitting RF interrogation pulses of various bandwidths to energize one or more SAW resonator elements. Initial RF interrogation pulses have a relatively wide bandwidth, such that the general location of a resonant device's resonant frequency can be expediently determined. Then, interrogation pulses having smaller bandwidth pulses can be transmitted near the determined general location of resonance to further narrow the location of resonance. In some emodiments, one or more initial interrogation pulses are transmitted in the center of or at an expected value within a range of operation of a resonant device. If the resonant frequency is not located at this initial location, then the range of operation is divided into halves (or other number of generally equal frequency range segments) and one or more interrogation pulses are transmitted at the center of each of the new search frequency range segments. This process of partitioning the search frequency range continues until the resonant frequency is located.
摘要:
A run-flat support ring, which is a component mounted upon a rim inside a tire to extend the distance the tire may travel at reduced or zero inflation pressure, is provided having one or more features that improve the process of mounting the support ring onto a rim and better tolerate variations, within manufacturing tolerances, in the respective diameters of the rim and the support ring.