Abstract:
A method for reducing the working temperature of a tire tread for vehicles utilizing a tire tread comprising a first portion and a second portion. The first portion comprising 100 parts by weight of an elastomeric material, 40-120 parts by weight of a filler, comprising from 50 to 100% by weight of carbon black and from 0 to 50% of silica, and 3-40 parts by weight of at least a conventional additive. The second portion comprising 100 parts by weight of an elastomeric material, 40-120 parts by weight of a filler, comprising from 30 to 100% by weight of silica and from 0 to 70% of carbon black, and 3-40 parts by weight of at least a conventional additive. However, the silica content in the second portion is at least 20% higher than in the first portion. Tires wherein the area of the first portion exceeds 37.1% of the total area of the tire tread are also disclosed.
Abstract:
A tread for a tire, the tread being provided with a plurality of cutouts, defined by walls perpendicular to or oblique to the rolling surface of the tread, in which the two main walls of at least one cutout located in the part of the tread affected by the loading on the ground of the tire during travel are connected by at least one rubber connecting element and in that the total connection surface SE of the connecting element(s) is at most 80% of the surface defined by the geometric contour L of minimum length and surrounding said total connection surface SE. A method for producing a cutout provided with at least one connecting element.
Abstract:
A method of determining a tread pattern for a pneumatic tire, the method including the steps of defining a first unit as including at least one pitch which is not less than a standard long pitch (PLa) and at least one pitch which is not more than a standard short pitch (PSa); defining a second unit as including at least one pitch within one of a first range of not less than the standard long pitch (PLa) and a second range of not more than the standard short pitch (PSa) but not including a pitch within the other range; defining a third unit as all the pitches therein are more than the standard short pitch (PSa) and less than the standard long pitch (PLa); selecting a number of the first units, second units and third units from a total number of units (U); and determining a tread pattern composed of a series of units based on the selected first units, second units and third units.
Abstract:
A tire tread band for medium/heavy duty motor-vehicles having circumferential grooves confining three pairs of respectively center, intermediate and shoulder ribs. Respective tread blocks are defined along the center and intermediate ribs and they are confined by transverse cuts. The center cuts impart a cusp-shaped end conformation and a hollow-shaped end conformation to the respective blocks, and the shapes of said end portions mutually match. The intermediate cuts run in the linear extension of the center cuts to give the respective blocks a rhomboidal configuration. The tire can be alternately associated with a driving axle or a driven axle, by merely reversing its direction of rotation, so that the following results are selectively achieved: an increase in the traction capability by the intermediate blocks or an increase in the directional capability as a result of the mutual wedging between the center blocks at the ground-contacting area.
Abstract:
A pneumatic tire having an air permeation preventive layer comprising (A) a thin film of at least one aliphatic polyamide resin wherein at least part of the amide groups thereof are modified with alkoxyalkyl groups, (B) a thin film obtained from the curing a liquid composition containing (i) a multi component copolymer polyamide resin, (ii) a curable resin, and (iii) a curing agent for curing the curable resin, (C) a thin film obtained by coating and cross-linking a polymer composition containing (i) at least one aliphatic polyamide resin wherein at least part of the amide groups thereof are modified with alkoxyalkyl groups and/or groups having curable unsaturated bonds and (ii) at least one cross-linking agent and/or curable resin other than an acid, or (D) a thin film of a vinylidene chloride-acrylonitrile copolymer obtained by copolymerizing 5 to 50 molar % of acrylonitrile.
Abstract:
A process and apparatus for laying a strip for the manufacture of a tire by extruding uncured rubber through a die to form a rubber tube on a rotary support and flattening the tubular form to form a band which is adhered to a receiving surface on the rotary support.
Abstract:
A method of designing a tread unit that may be repeated in succession about the circumference of a tire to produce an acoustically acceptable tread pattern. The impact of an initial design of a tread unit on a road surface is simulated so that a determination of the number of pulses contained in the impact may be made. An analysis is then performed, based on the number of pulses, as to whether the tread unit design satisfies a predetermined acoustic criteria. If the tread unit design satisfies the acoustic criteria, it may be incorporated into the tire tread pattern. Otherwise, the method may be repeated with a modified tread unit design until the predetermined acoustic criteria is satisfied.
Abstract:
A very soft polyurethane composition is provided having a low level of an aromatic phosphate or phosphonate plasticizer that will perform well as a self-sealing liner to flat-proof pneumatic tires, and will withstand the high temperatures of the tire retread process and still be functional. The liner is produced by a method of meter-mixing an isocyanate component and a high molecular weight polyol component system that can be poured directly into the tire to be lined as it is being rotated to spread the material uniformly in the tire until it sets up and will not cold flow. Also, the meter-mixed liner material can be poured on a flat surface of release paper to form sheet stock that can be cut into strips and then applied to the inner lining of the tire at a later time.
Abstract:
A pneumatic tire and a method of manufacturing the tire are disclosed. The tread portion is provided with a bag-like portion filled with a puncture sealant. The bag-like portion is formed by interposing an anti-adhesive sheet for preventing adjacent tire materials from bonding each other. The sealant includes a substance which dissolves the anti-adhesive sheet, whereby the bag-like portion is filled with the sealant including the anti-adhesive sheet in solution. The sealant may include water and propylene glycol, and in this case, a water soluble plastics film which is, for example, made of polivinyl alcohol obtained by hydrolyzing polyvinyl acetate is preferably used as the anti-adhesive sheet.
Abstract:
A method and apparatus for bonding an active tag to a patch and assembling the patch to a tire is set forth. A patch assembly and a method for securing an electronic monitoring device having electronic and mechanical components for monitoring at least one engineering condition within a tire, comprising an rigid tag assembly encapsulating the electronic monitoring device, bonded to a vulcanized rubber patch which is secured to the inner cavity of a tire utilizing a layer of dual cure bonding rubber.