212 results about "Rolling resistance" patented technology

The invention relates to the technical field of tire processing, in particular to a pattern and rolling resistance simulation evaluation method and system for a rubber engineering tire. The method comprises the following steps: acquiring tire pattern parameters; building a finite element model of tire-road surface contact according to the tire pattern parameters; according to the finite element model, determining deformation distribution, longitudinal tensile strain, grounding pressure distribution and pavement contact rigidity of the tire in the rolling process; and determining a rolling resistance evaluation value according to the deformation distribution, the longitudinal tensile strain, the grounding pressure distribution and the pavement contact rigidity. And rapid parameterization iteration is supported, and modeling errors caused by non-uniform geometric feature description are avoided. And the simulation accuracy and repeatability are ensured. The influence of the pattern structure on the rolling process is reflected, and a foundation is laid for a rolling resistance evaluation value. Quantitative evaluation of the tire rolling resistance is realized, data-driven design optimization is supported, and the simulation efficiency is improved.

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.

The invention relates to the technical field of road load testing, in particular to an automobile road load testing method and system. The method comprises the steps that a wind tunnel test environment is arranged, in the wind tunnel test environment, wheels of a to-be-tested vehicle are arranged on a wheel driving unit, a vehicle body is connected with a six-component force measuring balance through a vehicle skirt restraint system, and the vehicle skirt restraint system adopts a floating mode; airflow is controlled to blow through the surface of the vehicle, the central belt simulates ground motion, and the central belt and the wheel driving unit are synchronous with wind speed; the to-be-tested vehicle moves at each reference vehicle speed; after each reference vehicle speed is stable, determining the aerodynamic resistance of the to-be-measured vehicle at each reference vehicle speed based on a balance force transducer; meanwhile, based on the wheel driving unit, the rolling resistance of the wheel is determined; and determining the road load of the to-be-tested vehicle according to the rolling resistance and the aerodynamic resistance. According to the invention, the road load can be obtained more accurately, efficiently and quickly.

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 invention relates to a tyre (1) provided with a crown (4) comprising a crown reinforcement (20), a sublayer (7) and a tread (6). The lower layer (7) comprises a first base layer (71) radially outside the crown reinforcement (20) and a second cover layer (72) radially outside the first base layer (71) and radially inside the tread (6). The dynamic shear modulus G1 * of the first base layer is 1.5 MPa or less, and the dynamic shear modulus of the second cover layer is 5 MPa or more. The thickness E72 of the second cover layer (72) is associated with the maximum thickness ESC under the cut by the following relational expressions: E72 (mm) is greater than or equal to (0.53 * ESC + 0.1), E72 (mm) is less than or equal to (0.47 * esc + 1.1), ESC is in [1; 3.5] mm.

The present invention relates to tyre elastomeric compositions and compounds, to tyres for vehicle wheels comprising them which are particularly performant and advantageous for summer use. The tyres of the invention, comprising such compounds especially in the tread band, are characterized by reduced wear and rolling resistance and high grip, both under wet and dry conditions. These advantageous features are obtained by combining certain conjugated diene polymers with a plasticizing admixture with a predetermined content of resins and oils.

The invention relates to a tyre (1) provided with a crown (4) which is optimized for an advantageous compromise between drivability and rolling resistance. The crown (4) comprises a crown reinforcement (20), a lower layer (7) and a tread (6). The lower layer (7) comprises a first base layer (71) radially outside the crown reinforcement (20) and a second cover layer (72) radially outside the first base layer (71) and radially inside the tread (6). The dynamic shear modulus G1 * of the first base layer is 1.5 MPa or less, and the dynamic shear modulus of the second cover layer is 5 MPa or more. The thickness of the second cover layer (72) is [20%; 80%].

To provide a pneumatic tire capable of improving riding comfort performance while suppressing deterioration of low rolling performance.SOLUTION: The pneumatic tire 1 includes a cap rubber 2C having a rubber hardness B. In a tire meridian cross section of a normal state, a rim protector 10 having a top part 11 projecting to a tire outer side is formed on an outer surface side 4s of a first bead part side 4A. The rim protector 10 includes an inside circular arc surface 12 of a curvature radius C (mm) extending from a top part 11 to the inside in the tire radial direction and having a 12c central part in the tire outside. When a separation distance in the tire axial direction between the top portion 11 and a tire radial direction line RL defining a rim width of a normal rim R is H, the following formula (1) is satisfied. 12.8 ≤ H * B / C ≤ 93.5 (1) SELECTED DRAWING: Figure 1

The aim is to improve overall performance, including rolling resistance, tire durability at high speeds, and handling stability. [Solution] A tire comprising a carcass with carcass cords, a belt with belt cords provided on the radially outer side of the carcass, a band with band cords provided on the radially outer side of the belt, and a tread provided on the radially outer side of the band, wherein the band cords are band cords containing polyethylene terephthalate fibers, and the tread is formed using a rubber composition containing more than 50 parts by mass of styrene-butadiene rubber (SBR) with a styrene content of less than 25% by mass in 100 parts by mass of rubber component, and furthermore, when the thickness of the tread is T (mm), the amount of styrene in the styrene-butadiene rubber is S (mass%), and the diameter of the band cord is D (mm), the tire satisfies the following (Formula 1). T×S×D<80 (Formula 1)

The climbing steering driving wheel assembly of the cleaning robot comprises an upper integrated seat, and second machine shells are evenly installed at the bottom of one side of the upper integrated seat. During climbing, the miniature reversible air pump can be controlled by the controller to inflate the anti-explosion air bag layer fixed in the steering adjusting wheel through the rotary joint, so that the corrugated air pipe distributed on the outer wall of the anti-explosion air bag layer is expanded, and then the deformed corrugated air pipe can push the storable ground gripping ribs to slide in the limiting storage grooves; according to the steering adjusting wheel, the foldable ground gripping ribs are separated from the outer wall of the steering adjusting wheel, so that the ground gripping force is enhanced by utilizing an anti-skid structure formed by the foldable ground gripping ribs which are arranged at equal angles and protrude outwards, the smooth proceeding of climbing movement is facilitated, and when the steering adjusting wheel runs on the flat ground, the micro reversible air pump reversely drives the anti-explosion air bag layer to exhaust air, so that the anti-skid effect is achieved. And a user can conveniently push the storable ground gripping ribs into the limiting storage grooves for storage, so that the tread is recovered to be smooth, and the flat ground rolling resistance is reduced.

A determining device 200 detects i) the road condition of a route on which a vehicle powered by electrical energy from a fuel cell 110 and a secondary battery 120 plans to travel, and ii) the weight of the vehicle at a current position. The determining device 200 i) identifies a rolling resistance coefficient corresponding to the detected road condition by referring to a data table in which each of a multitude of road conditions is associated with a rolling resistance coefficient when the vehicle's wheels roll on the road with that road condition, and ii) determines the electrical energy required for the vehicle to travel along the route by using a rolling resistance calculated as the product of the identified rolling resistance coefficient and the detected weight.

This invention provides a tire that suppresses deterioration of rolling resistance, reduces electrical resistance, suppresses shrinkage of the unvulcanized rubber in the tread area that contacts the road surface, and improves high-speed durability. [Solution] The tire of the embodiment comprises Earth Red rubber 14, Cap Tread rubber 12 and Tie rubber 10. Earth Red rubber 14 has a specific surface area [m²] of carbon black CTAB adsorption. 2 The specific surface area × mass fraction (ET), which is the product of the [ / g] and mass fraction, is 20 to 40. The cap tread rubber 12 contains 80 parts by mass or more of silica per 100 parts by mass of rubber components, and the ratio of the mass of silica to the mass of filler is 90% or more. The tie rubber 10 is positioned on the inside of the tire relative to the carcass 4 and extends along the carcass 4 between a pair of bead cores 5. The specific surface area of ​​carbon black (A) and (B) of the tie rubber 10 with adsorption [m² 2 The product of [ / g] and mass fraction is between 20 and 40.

The present invention relates to a self-supporting tyre (100) for motor vehicles comprising sidewall reinforcing inserts (113A, 113B) having different stiffness. In particular, the stiffness of the sidewall reinforcing inserts on the sides of the tyre which are most stressed during running is less than the stiffness of the sidewall reinforcing inserts on the sides which are less stressed. The tyre of the present invention shows a reduced rolling resistance and better comfort during normal running and an unexpectedly increased mileage in run-flat running.

The utility model provides a starlike sleeve with an annular groove, which relates to the technical field of mechanical transmission parts and comprises a starlike sleeve body, a shaft hole is arranged in the middle of the starlike sleeve body, steel ball cavities which are uniformly distributed in a surrounding manner are arranged on the outer end face of the starlike sleeve body, and an inner annular groove is arranged on the wall face of the shaft hole. An oil injection hole is formed in the surface of the starlike sleeve body, an annular oil storage cavity is formed in the starlike sleeve body, and a dustproof plug is inserted into the oil injection hole. The inner ring groove formed in the wall face of the shaft hole and the communicating hole in the wall face of the inner ring groove are communicated with the inner annular oil storage cavity, lubricating oil in the oil storage cavity can evenly flow to the contact portion of the shaft hole and a shaft, the oil guide groove formed in the side wall of the steel ball cavity is communicated with the oil storage cavity, lubrication is provided for rolling of steel balls, rolling resistance is reduced, and the service life of the bearing is prolonged. Therefore, a good lubricating effect can be achieved, friction and abrasion are reduced, and the service life of equipment is prolonged.

The utility model provides a tire with low rolling resistance, which belongs to the technical field of tires and comprises a tread, a tire body and a belted layer arranged between the tread and the tire body, a central pattern groove extending along the circumferential direction of the tire is arranged in the middle area of the tread, and a plurality of transverse pattern grooves are arranged in tire shoulder areas on two sides of the tread. And the depth H1 of the transverse pattern grooves and the depth H2 of the central pattern grooves meet the equation that H2-H1 is equal to 2-3mm. The low-rolling-resistance tire has the characteristics that the weight of the tire is reduced, the rolling resistance is reduced, the heat dissipation is improved, the ageing resistance is improved, and the service life of the tire is prolonged.

The invention relates to a vehicle control method and device, a vehicle and a medium, and relates to the technical field of vehicle control. The control method comprises the steps that correction parameters are determined according to the ratio of first sliding resistance of a reference vehicle in the sliding process in the state that energy recovery is stopped and second sliding resistance of a target vehicle in the sliding process in the state that energy recovery is stopped; correcting a first recovery torque of the reference vehicle according to the correction parameter to obtain a second recovery torque; determining a target recovery torque of the target vehicle according to the second recovery torque; and performing energy recovery control on the target vehicle according to the target recovery torque. According to the technical scheme, the energy utilization rate of the vehicle can be increased.

The utility model relates to the technical field of farming equipment, in particular to a multifunctional radish farming machine which comprises a machine body, a walking device, a soil loosening mechanism, a seeding mechanism, a film mulching mechanism and a control system. The walking device adopts anti-skid rubber wheels and has high wear resistance, low rolling resistance and excellent road holding force; the soil loosening mechanism realizes efficient soil loosening by driving blades through a motor; the sowing mechanism uses an air pump to accurately put seeds; and the film mulching mechanism completes film mulching through a film pressing wheel and a soil covering blade. According to the control system, STM32F103C8T6 is used as a main control chip, and intelligent operation of equipment is achieved. The utility model solves the problems of low manual seeding efficiency and non-uniform machine seeding, improves the farming operation efficiency and quality, is energy-saving and environment-friendly, and is suitable for various farming scenes.

The invention relates to the technical field of tire rubber manufacturing, and discloses a tread rubber composition, a preparation method thereof and a new energy automobile tire. According to the tread rubber composition disclosed by the invention, two kinds of white carbon black with different specific surface areas are adopted, and when the ratio of the products of the specific surface areas and the parts of the white carbon black with the high specific surface area and the white carbon black with the low specific surface area meets 3.0-10.0 in the specified addition parts, the wear resistance, the wet grip performance and the rolling resistance of the rubber composition can be effectively and synergistically improved; and the optimization of the comprehensive performance is obtained.

The application relates to the technical field of vehicle testing, in particular to a testing method and device for the rotating torque of a hub bearing, wherein the method comprises the following steps: collecting a first test result of at least one rotating speed of the hub bearing before durability test under different temperature conditions; then, simulating the actual vehicle state by using preset parameters to control a test vehicle, so as to conduct a durability test on the hub bearing, and collecting a second test result of at least one rotating speed of the hub bearing before durability test under different temperature conditions; and substituting the first test result and the second test result into a preset rotating torque formula to obtain a rotating torque test result of the hub bearing. According to the embodiment of the application, the rotating torque test result of the hub bearing can be obtained by calculating based on the test results before and after the durability test, the test result of the rotating torque of the hub bearing is combined with the test data of different temperatures, the test result is fitted to the actual driving scene, the accuracy and objectivity of the test result are improved, and the design standard of the rotating torque of the hub bearing is improved to reduce the rolling resistance, so that the application is more practical.

To provide a rubber composition for a tire tread having good chipping resistance, tear resistance, abrasion resistance and low rolling resistance.SOLUTION: A rubber composition for a tire tread according to an embodiment includes rubber components including a natural rubber and a styrene-butadiene rubber, and silica having a CTAB adsorption specific surface area of less than 200m2 / g. The amount of the natural rubber in 100 parts by mass of the rubber component is more than 40 parts by mass and less than 75 parts by mass. The amount of styrene in the rubber component other than the natural rubber is 21% by mass or less. The amount of the silica is more than 55 parts by mass and less than 90 parts by mass per 100 parts by mass of the rubber component.SELECTED DRAWING: None

The invention discloses a preparation method of butadiene styrene rubber for a semi-steel tread, which is characterized in that a continuous four-step method is adopted for elution and drying treatment in a post-treatment process, and the method comprises the following steps: elution with hot water, drying in a vacuum oven, drying in a blast oven and thin-passing in an open mill. The butadiene styrene rubber prepared by the method disclosed by the invention can enable semi-steel tread rubber to have the characteristics of low rolling resistance, high wet skid resistance and high wear resistance, can effectively balance a tire magic triangle, and is suitable for a high-performance tire.

The accelerator of modern automobiles, especially electric vehicles, can be overly responsive, i.e., a small accelerator input can cause a relatively large increase in power applied to the drivetrain. This characteristic is beneficial for quick acceleration during medium to high-speed driving. However, it can be disadvantageous during low-speed maneuvers where space is tight and / or rolling resistance is high. To improve the safety and operating convenience, a special model can be added to the selections of automobile driving modes. This special mode can be activated automatically by the vehicle based on information such as vehicle location or manually by the driver.

The invention discloses a grade-A rolling resistance slagging-off TBR tire tread composition and a preparation method thereof, and relates to the technical field of tire preparation, the grade-A rolling resistance slagging-off TBR tire tread composition is prepared from the following raw materials by weight: 80 parts of natural rubber, 20 parts of solution polymerized styrene-butadiene rubber, 15 parts of N220 carbon black, 30 parts of high-dispersion high-performance white carbon black, 3 parts of talcum powder, 4 parts of an anti-aging agent, 7.8 parts of a modified silane coupling agent, 3.5 parts of zinc oxide, and 2 parts of modified stearic acid. 2 parts of a processing aid, 2.5 parts of an accelerant, 1.8 parts of sulfur and 1.2 parts of modified nano cellulose. The blending matrix formed by the natural rubber and the solution polymerized styrene-butadiene rubber is matched with the modified silane coupling agent and the high-dispersion and high-performance white carbon black to achieve the synergistic effect, the blending matrix can achieve elastic complementation, the modified silane coupling agent can improve the compatibility of the white carbon black and the rubber, and the modified silane coupling agent can improve the compatibility of the white carbon black and the rubber. The white carbon black is uniformly dispersed in a rubber matrix through a primary mixing process of an engaged internal mixer, so that the advantage of low hysteresis of the white carbon black is fully exerted.

The utility model discloses an emergency flood drainage operation robot, which belongs to the technical field of emergency flood drainage and comprises a main shell, the top of the main shell is fixedly connected with a mud pump for mud-water mixture, a water collecting tray for collecting flood and accumulated water is fixedly mounted below the mud pump, and the bottom of the mud pump is fixedly connected with a connecting pipeline. When the device is used, the idler wheels are arranged, on the flat ground or a low-water-level area, high-speed movement can be achieved through idler wheel driving by means of the characteristic of low rolling resistance of the idler wheels, rapid deployment in the initial stage of flood disasters is guaranteed, and the four supporting legs are arranged on ruins, wet lands and soft or uneven complex ground after flood disasters are located. The four supporting legs are matched with the bottom special-shaped supporting strips, the actions of climbing, gully crossing and the like can be achieved through alternate supporting gaits, sinking on the muddy ground or clamping stagnation in ruins is avoided, and it is ensured that the robot can go deep into the area where traditional equipment is difficult to reach to execute the flood drainage task.

The present invention relates to a high-strength polyethylene terephthalate yarn and tire cord having improved heat resistance. The polyethylene terephthalate tire cord according to the present invention has excellent physical properties even under high-temperature conditions, and maintains a high strength retention rate at high temperatures relative to room temperature, thereby achieving high heat resistance. Accordingly, a decrease in cord strength at high temperatures during molding is alleviated, thus making it possible to reduce tire weight. In addition, degradation of physical properties caused by an increase in tire temperature during high-speed driving of a vehicle is minimized, thereby reducing tire rolling resistance, improving handling performance, and enhancing vehicle fuel efficiency.

The application provides a method and device for testing rolling resistance in different regions, and belongs to the technical field of regional testing, and comprises the following steps: 1, selecting a target tire as a test sample and obtaining basic parameters of the target tire; 2, performing longitudinal partition processing on the tread of the target tire to obtain five tread regions, and numbering any tread region; 3, based on a rolling resistance test device and shielding material, measuring the rolling resistance values of different left side, right side, shoulder and middle tire pattern regions respectively; and 4, evaluating the resistance of the target tire according to the rolling resistance values and the tire pattern. The application improves the test precision and optimizes the tire performance.

The application relates to the technical field of road load test, in particular to a test method and system for road load of an automobile. The method comprises the following steps: arranging a wind tunnel test environment, in the wind tunnel test environment, wheels of a to-be-tested vehicle are arranged on wheel driving units, a vehicle body is connected with a six-component force measuring platform through a vehicle skirt restraint system, the vehicle skirt restraint system adopts a floating mode; air flow is controlled to blow through the surface of the vehicle, a central belt simulates ground movement, the central belt and the wheel driving units are synchronous with wind speed; the to-be-tested vehicle moves at each reference vehicle speed; after the to-be-tested vehicle is stable at each reference vehicle speed, aerodynamic resistance of the to-be-tested vehicle at each reference vehicle speed is determined based on a platform force sensor; meanwhile, rolling resistance of the wheels is determined based on the wheel driving units; and road load of the to-be-tested vehicle is determined according to the rolling resistance and the aerodynamic resistance. The application can more accurately, efficiently and quickly obtain road load.

The utility model provides a tire contour structure and a tire, which belong to the technical field of tires and comprise a tire crown, a tire shoulder and a tire sidewall, the tire crown comprises a tire crown outer contour curve and a tire crown inner contour curve corresponding to the tire crown outer contour curve; the bottom curve of a shoulder transverse groove formed in the tire shoulder comprises a first curve, a first straight line and a second curve which are connected in sequence, the first curve is close to one side of the tire crown, and the distance between the first curve and the inner contour curve of the tire crown is 1.5-2.5 mm; the second curve is close to one side of the tire side, the distance from the second curve to the inner contour curve of the tire crown is 2.3-4.0 mm, and the two ends of the second curve are tangent to the first straight line and the upper tire side arc of the tire side respectively. The tire contour structure disclosed by the utility model is beneficial to reducing the thickness of the shoulder of the tread, enhancing the rigidity of the shoulder, reducing the rolling resistance of the tire and improving the high-speed performance and the control stability of the tire.

The present application relates to a tire rubber performance detection method, and particularly relates to a method and system for measuring a low-temperature network dissipation index for characterizing the low-temperature rolling energy consumption tendency of rubber tire tread rubber. The present application performs a strain amplitude scanning under constant frequency at T0+ / -DeltaT three temperature points by RPA / DMA, calculates the area type Payne value A(T) of the logarithmic strain coordinate and the temperature derivative thereof at T0, and outputs an index; the mixed area can be normalized or G'' is introduced. Through regression calibration k of the whole tire rolling resistance according to ISO 28580 and a threshold value, fast, comparable and quantifiable prediction of low-temperature energy consumption of the material grade is realized, and the present application is suitable for formula development, incoming material release and process control.

This invention relates to elastomer compositions, elastomer compounds for tires, and vehicle wheel tires comprising said elastomer compounds, said elastomer compositions comprising a novel secondary crosslinking system comprising at least one methylene donor reagent having general formula (I) and at least one phenolic resin as a methylene acceptor reagent, wherein R1 is ethyl. The novel secondary crosslinking system of this invention allows for the imparting of optimal stiffness, thermal stability, tensile strength, and adhesion to reinforcing elements to materials, thereby improving the crosslinking kinetics and processability of the compound, while reducing or maintaining hysteresis. These materials comprising such crosslinking systems are less harmful than conventional crosslinking systems because they do not contain resorcinol, formaldehyde, and similar substances, and are therefore advantageously suited for tire components requiring a certain stiffness and tensile strength and / or high adhesion to fabric or metal reinforcing elements and low rolling resistance. (I)