2371results about "Tyre beads" patented technology

A tire or tire tread incorporating an elastomeric composition having improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as (inorganic filler/elastomer) coupling agent, a bis-alkoxysilane tetrasulfide of the formula:

in which:

• • the symbols R¹, which may be identical or different, each represent a monovalent hydrocarbon group selected from among the group consisting of alkyls, whether straight-chain or branched, having from 1 to 4 carbon atoms, and alkoxyalkyls, whether straight-chain or branched, having from 2 to 8 carbon atoms;
  • R² and R³, which may be identical or different, each represent a monovalent hydrocarbon group selected from among the group consisting of alkyls, whether straight-chain or branched, having from 1 to 6 carbon atoms, and the phenyl radical; and
  • x is between about 3 and about 5.

A pneumatic vehicle tire includes a carcass, a bead with a bead core arranged in the bead, and a first sensor located within the bead. The first sensor delivers signals which are correlated to frictional forces transmitted by the pneumatic vehicle tire during operation. This sensor has a first end and a second end, wherein the first end includes a heel attached to the bead core and the second end extends radially outward from the bead core within the tire. A plurality of such sensors can be included in each tire, some for measuring longitudinal forces in a circumferential direction of the tire and others for measuring lateral forces in an axial direction of the tire.

A rubber composition usable for the manufacture of tires, based on at least one diene elastomer, a reinforcing inorganic filler and a coupling agent providing the bond between the inorganic filler and the elastomer, wherein said inorganic filler comprises a silicon carbide having the following characteristics: (a) a BET specific surface area of between 20 and 200 m<2>/g; (b) an average particle size (by mass), dw, of between 10 and 350 nm. Tires or semi-finished products for tires such as treads comprising said rubber composition.

The present invention relates to a rubber composition containing a combination of starch, modified starch and/or starch/plasticizer composite together with selected methylene donor and/or methylene acceptor compounds. The invention also relates to tires having at least one component comprised of such rubber composition. Such tire component can be, for example, its circumferential tread or other component of the tire.

A carbon nanotube orientated composite formed by orientating carbon nanotubes in a given direction in a matrix having a heat conductivity lower than that of carbon nanotube, in which at least a part of carbon nanotubes are contacted with each other to be continuous from one end to the other end between both ends in the orientated direction, is provided as a material having a heat conductivity considerably higher than that of copper, aluminum or the like or a material to be disposed in rubber material having a low heat releasing characteristic to considerably improve the heat conduction, and also there are provided a method of producing the same as well as a pneumatic tire, a wheel for a vehicle, a tire-wheel assembly and a disc brake using this material.

The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functional group in the vicinity of the silanol group, the functional group accelerating reaction between the silanol group and the reinforcing filler; a rubber composition containing the (co)polymer and carbon black having specific characteristics; and a tire formed from the rubber composition.

The rubber-reinforcing fiber of the present invention is provided with a coating layer of a thickness of 10 Å to 40 mum. The coating layer is formed by dry plating and contains at least one metal and/or metal compound selected from the group consisting of cobalt, zinc, copper, titanium, silver, nickel and compounds of the aforesaid metals. With such a coating layer, the rubber-reinforcing fiber of the present invention forms a firm adhesion to a rubber component and drastically improves the fatigue resistance and durability of a rubber article, particularly, a pneumatic tire.

A non-pneumatic resilient tire which derives its capacity to bear a load from laminated elements capable of supporting bending moments. The laminated elements include a stack of resilient sheets superposed and separated by a layer of rubber adhering to the latter, forming a beam capable of undergoing bending stress.

A track frame or undercarriage is made to support a rubber track on suitable guide rollers. A tensioning roller is provided as one of the guide rollers on the interior of the track and is mounted on a pivoting bracket. The pivoting bracket moves the tensioning roller to a working position for creating tension in the track. An actuator provides a known force on the pivoting bracket to move the tensioning roller to its working position, using a controlled pressure applied to the actuator. Drive sprockets for the track are mounted onto a drive case that is mounted to the frame through pivoting linkages such that the drive case and the drive sprocket can be held in a working position and retracted away from the track. The position of the tensioning roller is maintained within set limits of retractions during use, by providing a stop to limit the amount that the tensioning roller can retract.

A heavy duty tire with decreased rolling resistance without impairing durability, comprising carcass 6, belt layer 7 disposed radially outward of the carcass in tread portion 2, and sidewall rubber 3g disposed axially outward of the carcass in sidewall portion 3 and extending in the radial direction of the tire, wherein the sidewall rubber includes an axially inner rubber portion 10 disposed axially outward of the carcass and an axially outer rubber portion 11 disposed axially outward of the inner rubber portion to form the tire outer surface, the inner rubber portion 10 has a lower loss tangent “tan δ” than the outer rubber portion 11 by a difference of 0.010 to 0.035, and the inner rubber portion 10 has a lower complex elastic modulus than the outer rubber portion 11 by a difference of 0.5 to 1.4 MPa.

Pneumatic tires adapted to use on bicycles have a number of criteria that need to be evaluated. For high performance bicycle riding, such as in mountain bike races, it is advantageous to optimize performance. Standard tires with tubes have ease of repair in the replacement of a punctured tube, have the ability to maintain pressure for long periods, and do not require special adaptation of the rim for sealing.

PCT No. PCT/JP97/00519 Sec. 371 Date Aug. 24, 1998 Sec. 102(e) Date Aug. 24, 1998 PCT Filed Feb. 24, 1997 PCT Pub. No. WO97/31028 PCT Pub. Date Aug. 28, 1997A diene rubber comprised of a conjugated diene homopolymer or a conjugated diene/aromatic vinyl copolymer; the homopolymer or copolymer having on at least one end of its polymer chain a quaternary ammonium group to which four carbon atoms have been bound; at least 10% of the bound conjugated diene units being a vinyl bond; and the homopolymer or copolymer further having a weight average molecular weight (Mw) of 100,000 to 2,000,000. This rubber exhibits well reduced heat build-up, which is an index of a well reduced rolling resistance, and having tensile strength and abrasion resistance.

It is a subject to restrict occurrence of deficient moldings and to improve the bead durability without harming the advantages provided through a bead wind structure, and for this purpose, a ply turn-up portion of a carcass comprises a winding portion, which continues from a main portion that is bent along a bead core, which extends while being spaced from the bead core, and which inclines at an angle θ that is smaller than 90°. A height of a tip end of the winding portion from an outer surface of the bead core is 3 to 15 mm. A cushion rubber having a complex elastic modulus E1* at 70° C. of 2 to 25 MPa is disposed in a region surrounded by a ply main body portion of the carcass, the bead core and the winding portion.

In a ground-contact surface shape of a tire, when a tangent angle formed between an axial direction of the tire and a tangent X at each point P on a profile line of the tire is defined as θ, a tangent angle θ₁ in a ground-contact end point Pd is 25° or smaller. When a minimum value of the tangent angle θ in a region Y which is separated away from a tire equator C by a distance in a range of not less than 0.4 times but not more than 0.7 times a half of the ground-contact width of the tread is defined as θ₂, and a tangent angle at a 0.9 times point Pq which is separated away from the tire equator C by a distance of 0.9 times the half of the ground-contact width of the tread is defined as θ₃, a difference (θ₃−θ₂) is set in a range of not less than −10° but not more than +10°.

There is provided a vehicle wheel that can suppress any detachment of a sub air chamber from a well portion when a fixing member between the sub air chamber and the well portion becomes defective by any possibility. A vehicle wheel comprises a sub-air-chamber member which reduces any air column resonance of a tire and which is disposed on an outer circumference surface of a well portion of a rim. The sub-air-chamber member is fixed on the well-portion outer circumference surface, the sub-air-chamber member is covered by a cover made of a rubber from an external side, and the cover is fixed on an outer circumference surface of the rim at both sides of the sub-air-chamber member in a rim width direction.

There is provided a non-pneumatic tire which can eliminate a necessity of filling a pressurized air or other gases to obviate a possibility of decrease or loss of the internal pressure of the tire and which can easily provide desired vertical, longitudinal and lateral stiffnesses in a mutually independent state.

The non-pneumatic tire has a rim member 1, a ring member 3 disposed at an outer circumferential side of the rim member 1 and provided with a tread 2 on a circumferential face, and a plurality of link mechanisms 4 coupling the rim member with the ring member. Each of the link mechanisms 4 consists of a pair of link members 7a, 7b consisting of a link 5a, 5b which is connected at a first end with a side portion of the rim member 1 and which is swingable in the circumferential and meridian directions and another link 6a, 6b which is connected at a first end with a side portion of the ring member and 3 which is swingable in the circumferential and meridian directions with second ends of the links being hingedly connected one another to make the links swingable in the meridian direction. A spring member 9 imparting a stiffness against relative displacements in the radian, circumferential and width directions with respect to the rim and ring members 1, 3 is provided on the link mechanisms 4.

This invention relates to certain rubber formulations which exhibit a low level of hysteresis which are comprised of a chemically functionalized renewed rubber and virgin solution styrene-butadiene rubber. These rubber formulations are loaded with a reinforcing silica. The rubber formulations of this invention can be utilized in making rubber products such as, tires, tracks, and conveyor belts which will promote energy savings by virtue of their low hysteretic properties. The present invention more specifically discloses a rubber composition which is comprised of (1) a solution styrene-butadiene rubber; (2) a functionalized renewed rubber composition which is comprised of an elastomeric polymer and a stabilizer; wherein the rubber composition has a crosslink density which is within the range of 0.05 to 2.0×10⁻⁵ mole/g, and wherein the rubber composition has a solubility fraction of less than 90 percent; and (3) a reinforcing filler including reinforcing silica.

The invention provides a novel all-steel mud-field tire, and belongs to the field of tires. Through the adoption of the novel all-steel mud-field tire disclosed by the invention, improving tire strength is facilitated, impact resistance and durability of the tire are improved, and the service life of the tire is prolonged. A longitudinal section of the all-steel mud-field tire comprises a tire crown (1), a tire shoulder (2), a tire sidewall (3), a tire bead (6), and a tire body (4), wherein the tire crown (1) is located on the outer side of the upper part of the longitudinal section; the tire shoulder (2) is connected with the tire crown (1); the tire sidewall (3) is connected with the tire shoulder (2); the tire bead (6) connected with a wheel rim is arranged at the lower part of the tire sidewall (3); the tire body (4) is located on the inner side of the section of the tire; a tire shoulder pad (21) is arranged on the tire shoulder (2); a convex rib (31) is circumferentially and annularly arranged on the outer part of the tire sidewall (3); and the tire body (4) is a layer of all-steel tire body.

A tire is provided, on a surface thereof, an applicaiton having a top layer exposed to the air and a bottom layer in contact with the tire. The top layer can be a rigid element and/or a marking covering, or a device for measuring or monitoring the tire. The bottom layer is a foam having a void ratio of at least 40%, a thickness of at least 0.5 mm, and a density ranging from 0.02 g/cm³ to 0.5 g/cm³.