908results about "Rolling resistance optimization" patented technology

A spoke winding type high-sensitivity humidity sensor, the humidity sensor comprising a humidity-sensitive winding material and a spoke winding skeleton disc; a plurality of "T" shaped winding skeletons are uniformly distributed in a radial manner on the circumference of the spoke winding skeleton disc, and the humidity-sensitive winding material is wound on the plurality of "T" shaped winding skeletons; the space between every two adjacent "T" shaped winding skeletons simultaneously constitutes a winding limiting groove and an air flow channel, and after the humidity-sensitive winding material is wound, there is still space, i.e. the air flow channel, for air circulation, which is used to shorten the humidity absorption response time and the humidity desorption response time of the humidity-sensitive winding material.

The application provides a heavy truck axle housing manufacturing method, which comprises the following steps: selecting a ladder-shaped pipe blank, firstly performing axial annular material supplementing pre-expanding to obtain a pre-expanding pipe blank with an upper flat side, a lower side and front and rear convex sides, the wall thickness of the upper flat side is almost not thinned, and the wall thickness gradually decreases from the upper side to the lower side along the annular direction; and performing final expanding after annealing to obtain an axle housing pipe, the upper side of the pre-expanding pipe blank becomes a front flat surface with a bell-shaped additional front cover, the front and rear sides are shaped into a H-shaped side beam, the lower side becomes a semispherical rear oil cover, and the wall thickness of the front flat surface and the side beam is increased. The pre-expanding die is composed of left and right pressing heads, left and right sliding dies, an upper control die and a lower control die, the cavity axial width of the upper flat area of the upper control die is greater than that of the front and rear convex sides. The manufactured heavy truck axle housing is free of welds and oil leakage, the wall thickness of the front flat surface and the side beam of the axle housing is large, the bending and torsion resistance is improved, the diameter expansion rate is large during hydraulic expanding, the wall thickness thinning rate is small, the forming quality is good, and the material utilization rate is high.

The utility model discloses a carbon fiber composite reinforced electric automobile hub which comprises a hub body, the hub body comprises a rim, the left side and the right side of the rim are respectively provided with a front wheel flange and a rear wheel flange, and the front wheel flange and the rear wheel flange are respectively provided with a wheel flange groove. Grid patterns are pressed in the rim groove, and a composite layer integrally formed with the hub body is arranged in the rim groove. The composite layer comprises gridding cloth and liquid glue, and the surface of the composite layer is flush with the surface of the rim; a plurality of strip-shaped grooves which are uniformly and annularly distributed are formed in the front surface of the hub body, and two polygonal grooves which are symmetrically formed are formed between any two strip-shaped grooves; the polygonal grooves are evenly and annularly distributed along the hub body and are arranged in a bilateral symmetry mode. The rim groove is formed in the rim of the hub body, and the composite layer integrally formed with the hub body is arranged in the rim groove, so that the structural strength is higher; and a plurality of grooves are formed in the hub body, so that the overall mass is lighter.

The invention relates to the technical field of tire rubber manufacturing, and discloses an EV tire tread rubber composition adapting to low temperature and a mixing method thereof. According to the invention, the high-vinyl solution polymerized styrene-butadiene rubber A, the low-glass transition temperature solution polymerized styrene-butadiene rubber B and the lithium-series cis-butadiene are matched to form a rubber substrate, and the high-dispersion white carbon black, the bio-based filling oil and the high-proportion wet-skid-resistant resin are matched, so that the matching amount of various raw materials is strictly controlled; and the rolling resistance of the tire at low temperature is effectively reduced while the gripping performance of the tire is ensured.

A wheel includes a boss, a rim, and a web. When viewed in a longitudinal section of the wheel, the boss includes a contour extending from the web to an end face in the axial direction of the boss. The contour includes curves. A first curve is continuous with the web. The first curve has a first radius of curvature. The second curve is arranged on the end face side in the axial direction of the boss relative to the first curve. The second curve has a second radius of curvature. The second radius of curvature is greater than the first radius of curvature. The path length of the second curve is greater than the path length of the first curve.

An omni wheel includes a hub bracket and roller components. Each roller component includes a first roller assembly and a second roller assembly. The first roller assembly includes a roller bracket and a first roller structure. The second roller assembly includes a second shaft and a second roller structure, and the second shaft includes a second shaft body and a limiting portion. The second shaft body is connected and locked to a first connection structure to axially limit the second roller structure with respect to the limiting portion and the first connection structure. The omni wheel can ensure that second rollers will not shake and oscillate during running of the omni wheel and thus reduce vibrations and noise of the omni wheel, therefore improving the running stability.

The invention relates to the technical field of tread rubber, and discloses high-performance tire tread rubber based on a synergistic system and a preparation method thereof.The method comprises the following steps of first-stage mixing, second-stage mixing, third-stage mixing, final mixing and vulcanization molding. By adopting a composite vulcanization system composed of dicumyl peroxide and sulfur and cooperating with zinc methacrylate as a functional auxiliary agent, a dual synergistic cross-linked structure composed of a free radical cross-linked network and an ionic cross-linked network is formed in the vulcanization process, so that the uniformity and stability of the cross-linked network structure of the tread rubber can be effectively improved, and the service life of the tread rubber is prolonged. The reasonable regulation and control of the crosslinking density of the tread rubber in the vulcanization process are ensured, the problem that a traditional single vulcanization system cannot give consideration to the wear resistance and the dynamic heat generation performance is solved, the comprehensive mechanical property and the dynamic use performance of the tread rubber are further improved, and firm chemical combination between the reinforcing filler and rubber molecules is ensured.

The invention discloses high-wear-resistance tread rubber for a mine tire and a preparation method of the high-wear-resistance tread rubber, and relates to the technical field of tires. According to the invention, the ATT-Si / AL additive is creatively introduced and used together with carbon black as a wear-resistant main body, and an alkaline accelerator formaldehyde p-toluidine condensation compound and a conventional accelerator are synergistically applied to a wear-resistant tread rubber system for the first time; wherein the accelerator formaldehyde-p-toluidine condensation compound not only provides flat vulcanization characteristic and excellent aging resistance for the rubber material, but also solves the problems of'filler-rubber 'interface weakening and stress concentration caused by high-hardness filler by activating silanization reaction and catalyzing covalent bonding between a sulfur cross-linked network and a rigid filler interface through the alkalinity of the accelerator formaldehyde-p-toluidine condensation compound; the ATT-Si / AL additive and the accelerator formaldehyde p-toluidine condensation compound cooperate to form a physical-chemical dual enhanced network, so that the tread rubber keeps high strength and high wear resistance level under extreme wear.

The invention discloses a low-noise and low-rolling-resistance tire tread and a preparation method thereof, and relates to the technical field of tire production, the low-noise and low-rolling-resistance tire tread comprises a supporting layer and multiphase composite tread rubber; the multiphase composite tread rubber comprises a continuous phase matrix, white carbon black with a two-phase structure, functionalized multiwalled carbon nanotubes, a disilane coupling agent, dynamic crosslinking thermoplastic elastomer particles, zinc oxide, stearic acid, an anti-aging agent, an accelerant and sulfur, and good wear resistance and mechanical strength are kept while the rolling resistance and driving noise of a tire are remarkably reduced.

The present application provides an all-steel snow tire tread, consisting of the following raw materials in parts by weight: 50-80 parts of natural rubber, 20-50 parts of solution polymerized styrene butadiene rubber with dual glass transition temperatures, 40-60 parts of carbon black, 10-20 parts of white carbon black with a high specific surface area, 1-2.5 parts of silane coupling agent, 5-10 parts of modified anti-wet skid resin, 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of anti-aging agent 4020, 1-3 parts of anti-aging agent RD, 1-3 parts of protective wax, 1-1.8 parts of sulfur, and 1-1.5 parts of promoter NS.

The invention discloses a high-wear-resistance nano filler modified rubber material and a preparation method thereof, and belongs to the technical field of rubber material modification. The preparation method comprises the following steps: by taking water-soluble polyacrylic acid micelles as a template, controlling the hydrolysis rate of tetraethyl orthosilicate by regulating and controlling the dosage of ammonia water, so as to prepare hollow SiO2 nanoparticles with a porous shell layer and a stable structure; and then synergistic modification is carried out through a PEG-PLA block copolymer and a silane coupling agent KH550, so that the dispersity and compatibility of particles are improved. And blending and banburying the modified porous hollow SiO2 particles and butadiene styrene rubber slurry, and carrying out vulcanization molding to obtain the modified rubber material. The wear resistance and tensile strength of the rubber are improved, good elasticity and elongation at break are kept, high strength, high wear resistance and high toughness are considered, and the process is mild and controllable.

The present invention provides a retainer for a rolling bearing that can stably maintain a low friction state even under severe lubrication conditions such as high-speed rotation by defining the surface roughness of the retainer using a plurality of three-dimensional surface roughness parameters, and a rolling bearing that uses the retainer. [Solution] The retainer 5 is a cylindrical resin retainer for a rolling bearing, and is formed with multiple pockets 6 that hold the rolling elements. The surfaces 6a that form the pockets 6 and at least one of the inner diameter surface 8 and outer diameter surface 9 of the retainer 5 have a value of A=(Sa / 10)+Str+(Spk / 10), which is calculated from the arithmetic mean height Sa, the aspect ratio Str of the surface texture, and the protruding peak height Spk, of 1.20 or more.

A pneumatic tire has a carcass. The carcass includes a carcass ply extending from one bead portion to the other bead portion through a tread portion. The carcass ply is provided with at least one conductive thread extending from one bead portion to at least the tread portion. The conductive thread has an electrical resistance of 108 Ω / cm or less per unit length. The conductive thread has a stress of 13 N or less at 1% elongation.

To provide a two-wheeled vehicle tire which is excellent in low fuel consumption performance and grip performance.SOLUTION: A two-wheeled vehicle tire comprises a pair of bead parts and a pair of side wall parts, and a tread part which is continuous with both side wall parts and comprises one or more rubber layers including at least a rubber layer constituting an outermost surface, and has a tire outer diameter Dt (mm) of 580 mm or more. In the two-wheeled vehicle tire, the Dt and a tanδ value 70°Ctanδ at 70°C and a tanδ value 40°Ctanδ at 40°C of a rubber composition forming the rubber layer constituting the outermost surface of the tread part satisfy the following formula (1) : (Dt / 450)-0.50≤70°Ctanδ / 40°Ctanδ.SELECTED DRAWING: Figure 1

The invention discloses in-situ synthesized wet-process mixed particle rubber and a preparation method thereof. The wet-process mixed particle rubber comprises the following raw materials in parts by weight: 90-110 parts of natural latex, 25-45 parts of water glass, 2-4 parts of a silane coupling agent and 0.5-1.5 parts of zinc oxide, wherein the dry weight of the natural latex is 90-110 parts; the dry weight of the water glass is 25-45 parts; the preparation method comprises the following steps: S1, hydrolyzing the silane coupling agent; and S2, preparing the wet-process mixed granular rubber. By utilizing an acidic microenvironment formed by hydrolysate of the silane coupling agent, while the white carbon black is generated, grafting of the silane coupling agent and the white carbon black and bridging of the silane coupling agent and natural latex are completed, and the dispersity of the white carbon black is remarkably improved. The in-situ synthesis method is adopted to prepare the wet-process mixed particle rubber, so that the method is energy-saving and environment-friendly, simple in process and low in equipment requirement, the cost is reduced, the efficiency is improved, and the prepared product is good in performance.

The invention discloses a high-temperature-resistant low-friction-coefficient low-abrasion sealing material and a preparation method thereof, and belongs to the technical field of sealing materials. The sealing material is prepared from the following raw materials in parts by mass: 60 to 80 parts of hydrogenated butadiene-acrylonitrile rubber, 20 to 40 parts of hydrogenated carboxyl butadiene-acrylonitrile rubber, 40 to 50 parts of carbon black N234, 4 to 6 parts of modified carbon fiber, 2 to 4 parts of modified hexagonal boron nitride, 3 to 5 parts of liquid polybutadiene, 3 to 4 parts of composite vulcanizing agent, 2 to 3 parts of zinc oxide, 1 to 2 parts of rubber anti-aging agent 445, 1 to 2 parts of anti-aging agent MB, 0.2 to 0.5 part of accelerant BZ and 0.5 to 2 parts of stearic acid. The modified carbon fiber is obtained by growing molybdenum disulfide on the surface of carbon fiber in situ and performing amination modification, the modified hexagonal boron nitride is obtained by performing grafting reaction on hydroxylated hexagonal boron nitride and an epoxy silane coupling agent, and the sealing material provided by the invention has high wear resistance and high temperature resistance.

The application discloses a light truck tire with a light-weighted bead structure and relates to the field of all-steel tires. The bead part comprises a tire body, a steel wire ring, lower triangular rubber, upper triangular rubber and wear-resistant rubber. The outer end point of the wear-resistant rubber is higher than the upper end point of the upper triangular rubber. The ratio of the height of the outer end point of the wear-resistant rubber to the height of the tire section is in the range of 0.23-0.53. The ratio of the height of the upper end point of the upper triangular rubber to the height of the tire section is in the range of 0.20-0.50. The outer end point of the wear-resistant rubber is higher than the upper end point of the upper triangular rubber, so that the thickness of the triangular rubber and the height of the triangular rubber are further reduced, the thickness of the bead is reduced, and stress concentration of the end points of the components of the bead part caused by the small difference level is avoided.

A functionalized rubber, its method of manufacturing and its use in a tire is disclosed. The functionalized rubber comprises polymer chains of the structural formula: wherein Polydiene represents a polymer chain comprising at least one diene monomer and wherein R1 and R2 can be the same or different and represent alkyl groups containing from 1 to 8 carbon atoms or moieties of the formula: wherein R3 represents alkyl groups containing from 1 to 8 carbon atoms.

To provide a rubber composition and a tire excellent in overall performance of hardness and crack growth resistance.SOLUTION: The rubber composition comprises a rubber ingredient containing a butyl-based rubber, a cyclic amine having double bonds in the ring, and carbon black having a 24M4DBP oil absorption of 170ml / 100g or more.SELECTED DRAWING: None

This invention belongs to the field of tire rubber material technology and discloses a self-healing, puncture-resistant rubber composition and its preparation method. The composition uses solution-polymerized styrene-butadiene rubber, cis-butadiene rubber, and halogenated butyl rubber as the rubber matrix, and incorporates nano-silica, bio-based organic acid surface-modified carbon black, hydrophobically modified lignin, PHA, TESPT coupling agent, compound compatibilizer, and a vulcanization system composed of diphenylurea and sulfur. This invention optimizes interfacial compatibility and crosslinking uniformity through the synergistic effect of multiple components, significantly improving the low-temperature flexibility, abrasion resistance, wet skid resistance, puncture resistance, and puncture repair performance of the rubber, while reducing rolling resistance. It effectively overcomes the problems of rubber embrittlement and uneven filler dispersion in cold environments, and can significantly improve the range and driving safety of pure electric vehicles in low-temperature environments. The preparation method is simple and suitable for large-scale industrial production.

This invention proposes a steering connection structure and a mining dump truck. The steering connection structure includes a front axle joint, a steering arm, a shear ring, and a shear pin. The front axle joint has a first through hole that extends through the front axle joint in a first direction, and a first receiving groove is formed at one end of the first through hole. The steering arm has an integral first part and a second part. The first part is located on one side of the front axle joint in the first direction and is connected to the front axle joint via a connecting assembly. The first part has a second through hole corresponding to the first through hole that extends through the steering arm in the first direction. A second receiving groove is formed at one end of the second through hole facing the front axle joint. The first receiving groove and the second receiving groove are joined to form an annular groove. The second part is used to connect the steering mechanism of the mining dump truck. The shear ring is disposed between the front axle joint and the steering arm and is received in the annular groove. The shear pin is connected between the front axle joint and the steering arm in the first direction.

The application discloses a profiled interlocking low-noise tire, which comprises a tire body and a tread block, wherein the tread block is arranged around the circumference of the tire body, and the tread block comprises: a center block arranged at the middle part of the tire body, and a plurality of first protruding parts arranged on both sides of the center block, and a first concave part formed between two adjacent first protruding parts; two side blocks arranged on both sides of the center block, and a plurality of second protruding parts arranged on both sides of the side block, and a second concave part formed between two adjacent second protruding parts; two shoulder blocks arranged on the sides, away from the center block, of the two side blocks, and a plurality of third protruding parts arranged on both sides of the shoulder block, and a third concave part formed between two adjacent third protruding parts. The application can reduce tire noise and improve the vibration avoidance performance and comfort of the tire.

The present invention discloses a liftable rubber bearing with an air spring, belonging to the technical field of bridge shock absorption. It includes an upper pier and a lower pier arranged oppositely, and the upper pier and the lower pier are connected by support columns. The support columns include connecting cylinders, rubber bonding blocks and a number of air elastic columns. The connecting cylinder is provided with a number of uniformly distributed air elastic columns penetrating along its circumferential direction. The air elastic columns can extend or shorten along the axis direction of the support column, and the connecting cylinder is filled with the rubber bonding blocks. By arranging a number of air elastic columns that can expand and contract along the axis direction of the support column in the circumferential direction of the support column, using the elastic characteristics of the air elastic columns, as the vibration load of the rubber bearing increases, the bearing capacity of the rubber bearing increases, and the air elastic columns can suppress the vibration amplitude and avoid resonance. When the impact load increases, the stiffness also becomes larger, ensuring a good vibration isolation effect.

The invention discloses an anti-aging flame-retardant tire rubber composition and a preparation method thereof, and belongs to the technical field of rubber tires. The rubber composition comprises the following components in parts by weight: 60-60 parts of natural rubber; 80 parts of butadiene rubber and 10 parts of butadiene rubber; 20 parts of organic silicon modified ethylene propylene rubber; 30 parts of a reinforcing filler; 50 parts of nano boron nitride; 8 parts of nano zinc oxide; 5 parts of stearic acid; 2 parts, 1.5 parts of sulfur; 2.5 parts of the raw materials and 1-2 parts of an accelerant; 3 parts of an anti-aging agent; 4 parts; the reinforcing filler is a mixture of modified white carbon black and modified montmorillonite according to the formula of (2 angstrom; and 4) a mass ratio of 1: 1. Through the synergistic effect of the organic silicon modified rubber and the modified montmorillonite, the rubber material has excellent mechanical properties, aging resistance and flame retardance, and the limit oxygen index reaches 33.5 angstroms; 35.8%, and vertical combustion V <->; the tensile strength retention rate after thermo-oxidative aging exceeds 91%, and the material can be widely applied to the high-requirement fields of lorries, engineering machinery, new energy automobiles and the like.

Provided are a rubber composition and a tire which have an improved overall performance in terms of abrasion resistance and chipping resistance. Included is a rubber composition containing rubber components including an isoprene-based rubber and a styrene-butadiene rubber, carbon black, silica, and at least one selected from the group consisting of compounds represented by the following formula (1) and compounds represented by the following formula (2): wherein A11 represents a monovalent cyclic hydrocarbon group having at least one polar group, and R11 and R12 each independently represent at least one selected from the group consisting of a hydrogen atom, an acyl group, an amide group, an alkyl group, a cycloalkyl group, and an aryl group, and wherein A21 represents a monovalent cyclic hydrocarbon group having at least one polar group, and R21 represents a divalent hydrocarbon group.

Provided are a rubber composition for a tire tread capable of achieving both improvement in low fuel consumption performance and improvement in abrasion resistance without impairing wet grip performance, and a tire tread formed at least in part from the rubber composition for a tire tread. A rubber composition for a tire tread contains 0.1 to 50 parts by mass of a modified liquid diene-based rubber (B) having a functional group derived from a specific silane compound and 20 to 200 parts by mass of a filler (C) with respect to 100 parts by mass of a specific solid rubber (A).

There is provided a method of production of a conjugated diene rubber comprising a first step of polymerizing a monomer containing a conjugated diene compound in an inert solvent using a polymerization initiator so as to obtain a conjugated diene polymer chain having an active end, a second step of reacting polyorganosiloxane represented by the following general formula (1) with the conjugated diene polymer chain having an active end by adding the polyorganosiloxane in an amount of 1 mole or more, when converted to the number of repeating units of the siloxane structure (-Si-O-) in the polyorganosiloxane, with respect to 1 mole of the polymerization initiator used in the first step, and a third step of reacting a compound represented by the following general formula (2) with the conjugated diene polymer chain with which polyorganosiloxane was reacted obtained in the second step.

A rubber composition for tire side wall comprising, per 100 parts by mass of a rubber component containing at least a diene-based rubber, 0.2 to 7 parts by mass of a compound represented by the following general formula (1):wherein at least one of R1 to R5 is an —OH group or an —OCH3 group and others are each an —H group or a hydrocarbon group having 1 to 20 carbon atoms, A is an unsaturated bond or an alkylene group having 1 to 20 carbon atoms and optionally having an —H group, a —CH3 group, an —NH2 group, an —O— group, or an —OH group, n is an integer of 0 to 10, and B is a —COOH group, an —OH group, or an ═O group and optionally forms a ring structure with adjacent R1 or R5.

[Problem] To provide a polymer composition that can be used to produce tire products having high grip performance and high fracture strength. [Solution] The polymer composition of the present invention includes: a rubber component including a conjugated diene polymer (A-1); and a polymer of a raw material component that is a C9 fraction containing an aromatic olefin; in which the conjugated diene polymer (A-1) comprises a structural unit derived from a conjugated diene compound and a structural unit derived from an aromatic vinyl compound; the amount of the structural unit derived from an aromatic vinyl compound is 5% by mass or more and 60% by mass or less with respect to the total amount of the structural unit derived from a conjugated diene compound and the structural unit derived from an aromatic vinyl compound; and the amount of a segment including isolated aromatic vinyl compound units in which the aromatic vinyl compound units are not continuous is less than 40% by mass, and the amount of a segment including a long sequence of consecutive aromatic vinyl compound units in which 8 or more aromatic vinyl compound units are continuous is 10% by mass or less, with respect to the amount of the structural unit derived from an aromatic vinyl compound.