3539 results about "Rolling resistance" patented technology

A process for obtaining a grafted diene elastomer having functional groups along the chain, a rubber composition containing this grafted elastomer and having in particular improved hysteresis properties in the cross-linked state, a preparation process for this composition, a tire tread made from this composition and a tire of reduced rolling resistance which incorporates this tread. A process for obtaining this grafted elastomer includes a radical grafting reaction carried out in solution or without a solvent by means of a reagent of the mercaptan type to graft functional groups on to the chain of a starting elastomer. The starting elastomer is treated with an antioxidant having at least one aromatic amine function before the grafting reaction, so that the grafted elastomer has a macrostructure which is practically identical to that of the starting elastomer. A rubber composition containing the grafted diene elastomer includes a reinforcing inorganic filler, and the grafted elastomer preferably has a molar ratio of units originating from conjugated dienes greater than 30%.

The invention discloses tile feeding driving mechanisms, tile feeding assemblies and a mahjong machine. Each tile feeding driving mechanism of the mahjong machine comprises a tile feeding support, a tile storage groove, a tile feeding guide rail, a tile feeding pushing head and a steel wire rope, rolling parts are arranged at the position, close to the corresponding tile feeding guide rail and/or the corresponding tile storage groove, of each steel wire rope, each rolling part is installed on the corresponding tile feeding guide rail or the corresponding tile feeding support in a rotatable mode, the part, located in the corresponding tile storage groove, of each steel wire rope are in rolling contact with the multiple rolling parts, and a gap is maintained between the part, located in the corresponding tile storage groove, of each steel wire rope and the corresponding tile feeding guide rail and/or the side wall of the corresponding tile storage groove. According to the scheme, sliding friction of steel wire ropes in the prior art is replaced with rolling friction of the steel wire ropes, friction resistance in the operation process of the steel wire ropes is greatly decreased, and the situation that the service life and operation stability of the steel wire ropes are influenced due to sliding friction contact between the part, located in the corresponding tile storage groove, of each steel wire rope and the corresponding tile feeding guide rail and/or the arc-shaped bent side wall of the corresponding tile storage groove is avoided.

A highly energy efficient automobile that provides payload, safety and performance capacities similar to a comparable vehicle of a given vehicle class. The current invention is ideal for short to medium range urban and suburban driving. The current invention incorporates components in a unique and novel way, in which these components combine to form a system that produces an automobile that reduces overall air pollution while encouraging the commercialization of alternative energy sources. The current invention features an lightweight, low rolling resistance, digitally controlled and direct-drive electric propulsion system. A lightweight spaceframe with a suspension system provides a structure for mounting a low-aerodynamic-drag body system and other components. An intelligent power and thermal management system coupled with a removable auxiliary power module supplies the electrical energy required. While the preferred embodiment is substantially a passenger vehicle, the current invention may be scaled to other land vehicles.

An initiator is presented for anionically polymerizing monomers, to provide a functional head group on the polymer. A polymer having a functional head group derived from a sulfur containing anionic initiator, and optionally as additional functional group resulting from the use of a functional terminating reagent, coupling agent or linking agent is also provided. A method is presented for anionically polymerizing monomers comprising the step of polymerizing the monomers with a sulfur containing anionic initiator to provide a functional head group on the polymer. An elastomeric compound, comprising a functional polymer and filler is also described. Also provided is a tire having decreased rolling resistance resulting from a tire component containing a vulcanizable elastomeric compound.

The invention discloses a silane-modified white carbon black-carbon black composite filling and a preparation method thereof. The method is characterized in comprising the following steps of: (1) adding white carbon black which is prepared by means of precipitation and white carbon black which is prepared by means of gas phase into a high-speed mixer according to the weight ratio of 3:1-3:2, slowly and evenly adding silane polysulfide in a spraying way, and gradually heating up at 100-120 DEG C to promote the surface modification reaction to be thoroughly performed; and (2) adding carbon black and mixing for 60-180min according to the weight ratio of the carbon black to the white carbon black which is prepared by means of gas phase and the white carbon black which is prepared by means of precipitation of 1:5-1:10 under the condition of continuous stirring and temperature persevering, and cooling by means of temperature reducing to obtain the silane-modified white carbon black-carbon black composite filling. The silane-modified white carbon black-carbon black composite filling which is prepared by the method improves the dispersibility of the white carbon black which is prepared by means of gas phase in rubber, reduces the charging time of a production field, obviously improves the operation environment, is used for the prescription of a tread rubber of a tire, can obviously reduce the rolling resistance of the tire, and saves the gasoline.

A rubber composition of improved hysteretic and physical properties which make it suitable for forming a tire tread, notably a tire tread of reduced rolling resistance, the rubber composition including carbon black having silica fixed to its surface as the majority portion of reinforcing filler and at least one functionalized diene polymer having at the end of its chain a silanol function or a polysiloxane block including a silanol end or a diene polymer modified along its chain by silanol functions.

Shock-absorbers used as wheel-spokes between wheel-hub and rigid rim, which may be lined with threaded rubber or having gripping features otherwise. It reduces rolling resistance, saving fuel. It improves drivability. The compliance of the shocks is commensurate with that of a comparable inflated tire, but optimized passively or actively circumferentially, vertically and laterally. Rubber-bushing or spoke-inclination enhances driving stability. Giant field assembled mining-truck-wheels may be produced and deployed and field-assembled quickly by common metalworking shops at fractional cost and weight. It is environmentally friendly, for hardly using or not using rubber. The gas or liquid of the shock spokes may be interconnected and cooled. Soft and hard driving may be controlled manually or by computer on the fly. It is suitable for applications ranging from bicycle wheels to aircraft landing gears. It is fireproof, bulletproof, airless and silent. It cannot bounce or skid at jumpstart or braking and on ice.

The invention provides a preparation method of white carbon black modified styrene-butadiene rubber facing green tires and a product thereof. White carbon black is used in the technical field of styrene-butadiene rubber modification, so as to provide guidance to the application of the white carbon black modified styrene-butadiene rubber in the tire industry. The styrene-butadiene rubber is characterized in that the styrene-butadiene rubber contains white carbon black of which the weight percentage to dry styrene-butadiene rubber latex is 30 percent to 100 percent. The preparation method comprises the steps that firstly, the white carbon black is mixed with water to obtain a white carbon black-water suspension; afterwards, the white carbon black-water suspension is subject to surface treatment, so as to enable the surface of the white carbon black to be organized; the pH (potential of hydrogen) value of the suspension is adjusted to be 9 to 12; and finally, the suspension is evenly mixed with the styrene-butadiene rubber latex to obtain liquid styrene-butadiene rubber sizing to which the white carbon black is added, and then the modified styrene-butadiene rubber containing the white carbon black is prepared by adopting an emulsion blending and flocculation process. The white carbon black modified styrene-butadiene rubber prepared by adopting the preparation method has the advantages that the white carbon black is evenly distributed in the styrene-butadiene rubber, and compared with pure styrene-butadiene rubber, the mechanical performance, the wet-skid resistant performanceand the rolling resistance of the white carbon black modified styrene-butadiene rubber are remarkably improved.

A method for providing an estimate of brake pad thickness. The method employs fusion of sensors, if used, and driver brake modeling to predict the vehicle brake pad life. An algorithm is employed that uses various inputs, such as brake pad friction material properties, brake pad cooling rate, brake temperature, vehicle mass, road grade, weight distribution, brake pressure, brake energy, braking power, etc. to provide the estimation. The method calculates brake work using total work minus losses, such as aerodynamic drag resistance, engine braking and/or braking power as braking torque times velocity divided by rolling resistance to determine the brake rotor and lining temperature. The method then uses the brake temperature to determine the brake pad wear, where the wear is accumulated for each braking event. A brake pad sensor can be included to provide one or more indications of brake pad thickness from which the estimation can be revised.

The F track running structure has its suspension running frame made of two parallel vertical beam and anti side rolling module, through four corners installed support arm linked to form the rectangular suspension running frame module, suspension electromagnetic iron connected with support arm at both sides vertically, each has emergency rescue wheel supported by the hydraulic cylinder, sliding platform connected through the steel cable and the support arm with inner side having forcing guide device through the installation base, combining several assembled suspension running frame modules together. It ensures the train follow F track all the time through air spring, side rolling resistance, horizontal block device, forced guide device to realize the movement decoupling. It reduces the vibration from the track and the system itself, applies to all kinds of specified geometrical torque and unsmoothness, greatly reduced in vehicle noise. It has flexible line selection, low in noise, low in cost, applicable for running between stations.

A method for preparing a graphene oxide/white carbon black/rubber nanocomposite material is described. The prepared graphene oxide/white carbon black/rubber nanocomposite material contains nanoscale graphene oxide and white carbon black that are highly dispersed. The nanocomposite material has a relatively high modulus, excellent wear resistance and tear resistance, a relatively low rolling resistance, and at the same time has a low air-permeability and excellent self-healing capability.

The invention provides a vehicle mass identification method and a device. The vehicle mass identification method comprises the following steps of: acquiring wheel rotating speed and driving torque of a vehicle during running; acquiring a longitudinal acceleration value of the running vehicle; constructing a longitudinal kinetic equation of the vehicle; and on the basis of the longitudinal kinetic equation, setting a roughly estimated vehicle mass by taking the wheel rotating speed, the driving torque and the longitudinal acceleration value of the running vehicle as measurement input parameters and taking a sum of rolling resistance and air resistance as a variable, and identifying the mass of the vehicle through a recursive least square method with a plurality of forgetting factors.

The present invention provides a rubber composition for a tire tread, in which processability, abrasion resistance, rolling resistance properties and wet grip performance are improved in a balanced manner. Specifically, the present invention provides a rubber composition for a tire tread comprising 5 to 150 parts by weight of silica having nitrogen-adsorbing specific surface area of 100 to 300 m²/g based on 100 parts of a rubber component containing 5 to 100% by weight of an epoxidized natural rubber, and 1 to 20 parts by weight of a silane coupling agent and 0.1 to 20 parts by weight of an anionic surfactant based on 100 parts by weight of the silica; and a rubber composition for a tire tread comprising 5 to 150 parts by weight of silica having nitrogen-adsorbing specific surface area of 100 to 300 m²/g and 1 to 10 parts by weight of a metal salt of stearic acid, based on 100 parts of a rubber component containing 5 to 100% by weight of an epoxidized natural rubber, and 1 to 20 parts by weight of a silane coupling agent based on 100 parts by weight of the silica.

The invention relates to a dynamic load simulating device and a dynamic load simulating method for an automobile power system test, and belongs to the technical field of vehicle power system tests. The dynamic load simulating device comprises a control computer, a dynamometer controller, a frequency converter, an alternating current (AC) power dynamometer and a torque flange with a controller. A virtual automobile model-based control algorithm is adopted, a virtual automobile model is driven by an actual measurement torque, and the simulation of the rolling resistance, wind resistance and the inertia resistance of a vehicle is realized under the conditions of not calculating angular acceleration of the dynamometer. The dynamic load simulating device and the dynamic load simulating method have high stability and high simulation precision, are favorable for shortening the development cycle of an automobile power system and providing convenient test environment for the development of the power system. A process that the vehicle acceleration is acquired by differentiating the rotation speed of the automobile power system is avoided in the calculation process, and a phenomenon that accurate differential values are difficult to acquire due to relatively large noise caused by the process of differentiating the rotation speed is prevented.

There is obtained a rubber composition excellent in processability of unvulcanized compounded rubber, excellent in wear resistance and wet skid resistance of vulcanized rubber, low in rolling resistance, and suitable for tire applications, particularly for tire tread applications in which importance is given to low fuel consumption and safety. A rubber composition mainly comprising (I) 0.5 to 35% by weight of a conjugated diene-based (co)polymer rubber having an amino group and an alkoxysilyl group on a polymer chain and having a weight average molecular weight of 1,000 to 90,000, and (II) 99.5 to 65% by weight of a conjugated diene-based (co)polymer rubber having a weight average molecular weight of 100,000 to 2,000,000 (with the proviso that (I)+(II)=100% by weight).

The present invention relates to a cross-linkable or cross-linked rubber composition having improved hysteresis properties in the cross-linked state which is useful for constituting a tire tread, to a process for preparation of such a cross-linkable composition, to a tread of this type and to a tire having reduced rolling resistance. The rubber composition according to the invention is based on: an elastomeric matrix comprising at least one diene elastomer which comprises a carboxylic acid function at one or at each of its two chain ends, and a reinforcing filler comprising a reinforcing inorganic filler, wherein said diene elastomer has a molecular weight which is greater than 80,000 g/mol, and it is present in a majority quantity in said elastomeric matrix.

The present invention provides an improved shear band for use in non-pneumatic tires, pneumatic tires, and other technologies. The improved shear band is uniquely constructed of honeycomb shaped units that can replace the elastomeric continuum materials such as natural or synthetic rubber or polyurethane that are typically used. In particular, honeycomb structures made of high modulus materials such as metals or polycarbonates are used that provide the desired shear strains and shear modulus when subjected to stress. When used in tire construction, improvements in rolling resistance can be obtained because of less mass being deformed and reduced hysteresis provided by these materials. The resulting mass of the shear band is greatly reduced if using low density materials. Higher density materials can be used (such as metals) without increasing mass while utilizing their characteristic low energy loss.

By using a vulcanized rubber composition containing a rubber component composed of at least any one of a natural rubber, a modified natural rubber and a synthetic rubber, and chemically modified microfibril cellulose, it is possible to provide a vulcanized rubber composition that is environmentally conscious and that exhibits excellent rupture characteristics and a low energy loss, and a pneumatic tire that is excellent in rolling resistance property, steering stability and durability.

The invention relates to a preparation method of polar solution-polymerized styrene-butadiene rubber with low gel rate. The method involves grafting polar monomers on solution-polymerized styrene-butadiene rubber by means of free radical solution method, so as to change the polarity and further improve the interface bonding force of styrene-butadiene rubber and carbon black or white carbon black, so that the wet-skid resistance, wear resistance and dynamic mechanical property of vulcanized rubber are improved and the rolling resistance is reduced. The polar monomers used comprise maleic anhydride, acrylic acid, acrylamide, N-vinyl pyrrolidone and the like. The grafting rate of modified styrene-butadiene rubber is 1-5% and the gel rate is 1-3%; and the rubber polarity changes obviously.