552 results about "Rolling resistance" patented technology

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim to provide a gas suspension for relative movement between the inner rim and the outer rim. Each of the gas springs may have a controllable gas pressure. The wheel assembly also includes a wheel rotational position sensor, a vehicle operator control input interface, and a controller configured to control the gas pressure in each of the gas springs in a pattern in response to the wheel rotational position sensor and vehicle operator control input interface to assist in one of overcoming a rolling resistance of the wheel and a braking of the wheel.

The invention discloses a complex terrain-oriented tracked vehicle energy efficiency optimization path planning method and system, and the method comprises the steps: firstly constructing a joint energy consumption model on a rasterized three-dimensional terrain, and superposing the straight rolling resistance, gradient and steering equivalent resistance moment energy consumption to obtain node cost; then, under the framework of a weighted A * function, the product of Euclidean distance and energy consumption rate is used as a heuristic function, and rapid rough search is achieved; halton sampling is carried out on the coarse path nodes, an environment vector is calculated based on the distance between a sample and the center and the gradient difference, offsets are carried out, impassable samples are removed, secondary search is carried out after a probability road network is reconstructed, and the local path quality is improved; and finally, smoothing the broken line by using a three-dimensional fourth-order B spline, eliminating the conflict with the impassable area by densifying nodes, and outputting an executable track with continuous curvature. Simulation shows that compared with A *, Dijkstra and PRM algorithms in complex terrains, the method saves energy by 5.2%-12% on average, and the energy saving performance of the tracked vehicle is achieved.

The invention discloses a low-resistance and high-wear-resistance tire rubber composition as well as a preparation method and application thereof, and belongs to the technical field of rubber materials. The tire rubber composition comprises the following raw materials in parts by weight: 50-70 parts of natural rubber NR, 30-50 parts of solution polymerized styrene-butadiene rubber SSBR, 40-60 parts of modified white carbon black, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1-3 parts of an anti-aging agent 6PPD and 2.5-3.5 parts of a vulcanization system. The prepared tire rubber material has the advantages that the rolling resistance is obviously reduced, the wear resistance is improved, the energy consumption is effectively reduced, and the requirements of new energy automobiles on high-performance tires are met. Through three-step modification treatment, the white carbon black is uniformly dispersed in a rubber matrix, and the interface bonding is firm, so that the prepared tire can reduce the rolling resistance of the tire using the tread rubber, and the tread rubber has higher wear resistance, tensile strength and elongation at break, and accords with the development direction of new energy automobiles in the future.

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 a low-rolling-resistance pneumatic tire, and the low-rolling-resistance pneumatic tire is provided with a tread, and a circumferential groove is formed in the tread; each circumferential groove is provided with a notch groove, a thin groove and a water storage groove which are sequentially formed from the tire surface to the interior of the tire body; the maximum widths of the notch groove, the thin groove and the water storage tank in the axial direction of the tire are marked as W1, W2 and W3 respectively, and at least W2lt is met; w1 and W2lt; w3. According to the low-rolling-resistance pneumatic tire, the three-section groove design of the notches, the thin grooves and the water storage grooves is adopted in the radial direction of the tire through the central circumferential groove, and parameters such as the width, the depth and the repeated spacing are reasonably configured for the three-section groove design, so that it is ensured that the tire has excellent wet land performance, low-rolling-resistance performance and stone clamping prevention performance.

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 testing, in particular to an asphalt mixture and tire interactive loading type rolling resistance accurate testing device and a testing method thereof. The method specifically comprises the following steps: step 1, determining a loading load of a loading assembly, a rotating speed of a torque control assembly, and test parameters of asphalt mixture test pieces and test tires of corresponding types; 2, adjusting equipment according to a measurement mode according to a measurement requirement, wherein the measurement mode is divided into an overall rolling resistance test and a local rolling resistance test; 3, acquiring image data and test data after the asphalt mixture test piece and the test tire are tested, calculating rolling resistance, and obtaining final rolling resistance test data through an overall rolling resistance test and a local rolling resistance test; the resistance testing device has the beneficial effects that the resistance of the asphalt mixture test piece and the rolling resistance testing assembly can be measured, so that the error of the resistance coefficient between the tested tire and the asphalt mixture test piece obtained through measurement is reduced.

A two-wheeled vehicle pneumatic tire having a tread, a tire carcass, tire sidewalls, and two bead regions with a bead protective strip. The tire carcass is formed from a first carcass inlay and a second carcass inlay. The second carcass inlay is arranged radially inwardly of the first carcass inlay, and extends from a crown region (17) of the two-wheeled vehicle pneumatic tire and terminates at a second carcass inlay end under the bead protective strip. The two-wheeled vehicle pneumatic tire provides improved puncture protection whilst maintaining good rolling resistance. This is achieved in that the first carcass inlay is guided with a first carcass inlay turn-up over the particular tire sidewall as far as under the tread to a first carcass inlay end, and terminates there at the first carcass inlay end.

A system for controlling a machine includes a machine configured to travel down a slope, the machine having a braking system, a sensor configured to generate a signal that indicates travel speed of the machine or a weight of the machine, and a controller. The controller is configured to receive the travel speed signal, estimate a rolling resistance of the machine, the rolling resistance being affected by a surface on which the machine travels, update the rolling resistance of the machine over time, and set an amount of braking based on the signal and the rolling resistance estimate.

The invention relates to the technical field of low-carbon microalloyed steel production, in particular to a high-efficiency rolled thin L450M pipeline steel plate and a manufacturing method thereof, the steel comprises the following chemical components in percentage by weight: 0.05%-0.07% of C, 0.10%-0.25% of Si, 1.45%-1.55% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.05%-0.06% of V, 0.05%-0.10% of Cr, 0.008%-0.020% of Ti, 0.015%-0.04% of Al, 0.005%-0.009% of N and the balance of Fe and inevitable impurities, and the total amount of impurity elements is less than 0.05%; the production process of the steel plate comprises the steps of molten steel smelting, external refining and degassing, continuous casting, casting blank heating, controlled rolling, controlled cooling and air cooling to the room temperature. The method is used for manufacturing the high-strength L450M hot-rolled steel plate for the oil pipeline with the thickness specification being 9-15 mm and the pipe diameter being phi 914 mm or below, the problems that the steel plate rolling efficiency is low, the rolling resistance is large, the steel plate performance uniformity and the plate shape are not easy to control and the like are solved, and the steel plate has the advantages of being low in cost, high in strength and toughness, high in strength, excellent in low-temperature toughness and the like.

The invention discloses a method for increasing the sidewall turn-up height in a building process of an all-steel radial tire, which comprises the following steps of: acquiring multi-source data such as temperature, pressure and angle in a turn-up process through an infrared temperature sensor, a pressure sensor and the like; and constructing a multiple linear regression model, a machine learning model and a hybrid model fused with the physical principle, analyzing the relationship between the process parameters and the anti-package height, and performing verification and optimization. According to model output parameters, a servo motor is used for accurately controlling the downward pressing angle and pressure of a reverse wrapping pressing roller, and production is executed in cooperation with an auxiliary supporting ring and a sectional type reverse wrapping technology; meanwhile, the turn-up height is detected in real time through an intelligent monitoring system, and parameters are automatically adjusted when the turn-up height does not reach the standard. According to the method, precise regulation and control of the tire sidewall turn-up height are achieved, compared with a traditional process, the product percent of pass is increased to 95% or above from 85%, the production efficiency is improved by 20%-30%, the tire structure stability is effectively enhanced, the rolling resistance and the tire burst risk are reduced, and intelligent upgrading of tire manufacturing is promoted.

The invention discloses a tire material modulus determination method and device. The method comprises the steps that a two-dimensional material distribution diagram of a tire is obtained, a two-dimensional finite element tire model is constructed based on the two-dimensional material distribution diagram, and then a three-dimensional finite element tire model is constructed; the circulation process is as follows: first modulus distribution data of the current circulation are taken, and second modulus distribution data are obtained through amplification by a preset multiple; the first modulus distribution data and the second modulus distribution data are substituted into the three-dimensional model for steady-state rolling simulation, and a first simulation result and a second simulation result are obtained; determining deformation index distribution data of the tire according to the two simulation results; if the deformation index does not meet the preset condition, correcting the first modulus distribution data according to a preset adjustment rule, and applying the first modulus distribution data to the next cycle; and if a preset condition is met, ending circulation, and outputting final first modulus distribution data. The technical problems of low durability and high rolling resistance of the tire caused by unreasonable configuration of the modulus of the tire material in the tire production process are solved.

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 relates to the technical field of tire rubber manufacturing, and discloses a tread rubber composition containing modified liquid rubber. According to the rubber composition, solution polymerized styrene-butadiene rubber and butadiene rubber are used as rubber substrates to construct a rubber system, and high-specific-surface-area white carbon black (BET is greater than or equal to 180m / g) is also added into the rubber system. The modified liquid rubber is added into the rubber system. The modified liquid rubber is prepared by melting and grafting unsaturated regenerated liquid rubber and maleic anhydride in the presence of a free radical initiator, and waste tire resources are effectively utilized. The modified liquid rubber can be used as a wetting agent, a coupling agent and a cross-linking active matter in the tread rubber composition at the same time, can effectively improve the dispersibility of the white carbon black, enhance the interface bonding force of the white carbon black and the rubber composition, weaken the Payne effect and enhance the wear resistance of the rubber composition, and does not affect the rolling resistance and wet skid resistance of the rubber composition. And the low-energy-consumption requirement of a new energy automobile is met.

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 provides a high-performance tire tread material as well as a preparation method and application thereof. The high-performance tire tread material is prepared from the following raw materials: functionalized solution polymerized styrene-butadiene rubber, epoxidized rubber, filler, an activating agent, an anti-aging agent, a plasticizer, an accelerant and a vulcanizing agent. The composition comprises the following components in parts by weight: 50-95 parts of functionalized solution polymerized styrene-butadiene rubber based on the total weight of the functionalized solution polymerized styrene-butadiene rubber and the epoxidized rubber being 100 parts; 5-50 parts by weight of epoxidized rubber; the functional group of the functionalized solution polymerized styrene-butadiene rubber is at least one of siloxane group, amido, carboxyl, ester group, hydroxyl, acylamino, sulfur-containing group and perfluoroalkyl. The prepared high-performance tire tread material can be used for preparing green tire treads, has lower rolling resistance and heat generation and higher elongation at break, and improves wet skid resistance and wear resistance.

The invention relates to a pyrolysis carbon black reinforced tire transition layer rubber material and a preparation method thereof. The pyrolysis carbon black reinforced tire transition layer rubber material comprises the following components in parts by weight: 93.5-97.5 parts of first section rubber; 2-6 parts of sulfur; 0.3 to 0.8 part of an accelerant; and 0.1 to 0.5 part of scorch retarder. The head section rubber comprises the following components in parts by weight: 40-60 parts of natural rubber; 30 to 50 parts of carbon black; 5-15 parts of thermal cracking carbon black; 3-10 parts of zinc oxide; 2-6 parts of an anti-aging agent; and 0.2 to 1 part of cobalt boroacylate. Compared with the prior art, zinc oxide and white carbon black contained in the thermal cracking carbon black are utilized, and on the premise that the tensile property of the tire transition layer rubber material is not reduced, the cord thread drawing force is improved, and the heat generation performance of the tire transition layer rubber material is improved. Heat generation is reduced, the rolling resistance of the tire can be reduced, oil consumption is reduced, the excellent cord thread drawing force is achieved, and the safety performance of tire running is improved. Tyres use a large amount of rubber materials and need a large amount of reinforcing agents. When the thermal cracking carbon black is used in the tire, popularization and application of the thermal cracking carbon black can be further promoted, cyclic utilization of the tire is promoted, the environment is improved, and carbon neutralization is achieved.

The present application relates to the technical field of rubber, in particular to a kind of hydrazide compound, rubber composition and its preparation method and application.The present application provides a kind of hydrazide compound, is mono-hydrazide compound or double hydrazide compound, they have lower melting point, can be well dispersed in rubber matrix in the range of mixing temperature, further ensure its effect.And the hydrazide compound of this kind is added to rubber composition, can obtain the tire product of processing performance improvement, dynamic modulus promotion, anti-wet sliding and balanced rolling resistance.

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 invention discloses a method and a system for estimating windless speed and somatosensory altitude in a riding process. The estimation method comprises the following steps: acquiring physiological information, position information and riding data of a user; acquiring weather information at the current moment; estimating a riding course according to the position information; calculating power, potential energy and instantaneous kinetic energy for overcoming wind resistance / wind pushing by combining physiological information, riding data and weather information; calculating rolling resistance overcoming power according to the physiological information and the riding data; summing the power to obtain virtual power; and in consideration of a windless condition, converting the virtual power to serve as a constant term to construct an equation, and further solving the equation to obtain a windless speed and a somatosensory altitude. According to the method, the windless speed and the somatosensory altitude corresponding to the riding intensity in any riding environment can be obtained, namely, the real body feeling of user riding is obtained, the estimation result is accurate, and data with more reference significance is obtained.

The present invention relates to the technical field of intelligent design of tires, and in particular to an analysis method, application and program product of the influence degree of rubber modulus on tire rolling resistance. The calculation process of the present invention can obtain the influence trend of modulus on rolling resistance. Since the deformation mode of the rubber material is refined and decomposed, that is, when the deformation index is greater than 0, it is considered to be a strain and energy mixed control mode, and when the deformation index is less than 0, it is considered to be a stress and energy mixed control mode. By solving a and b parameters, the influence trend and influence degree of the rubber material modulus on rolling resistance can be accurately judged according to the positive and negative sum of m, a and b values, which can provide effective guidance for tire design engineers and material development engineers.

A multi-segment support (10) of a non-pneumatic tire, comprising at least three leg portions (11) connected in sequence and nose portions (12) correspondingly connected between any two adjacent leg portions (11). Each leg portion (11) comprises a framework (1101) and a connecting portion (1102) connected to the framework (1101), and the connecting portion (1102) and the nose portions (12) are both made of a polymer elastic material and are fixedly connected to each other. Since each leg portion (11) comprises the framework (1101), and the framework (1101) provides an effect of supporting and has a lower deformation capability than the elastic material, the amount of the elastic material used of the leg portion (11) can be reduced, and the use of the elastic material at a deformed and stressed portion can be avoided, thereby significantly reducing a rolling resistance. In addition, the nose portions (12) made of polymer elastic materials enable the multi-segment support (10) to have a deformation capability when subjected to a force, can serve as a movable joint connecting two adjacent leg portions (11), and provide effects of buffering and shock absorption. In addition, the connecting portions (1102) and the nose portions (12) are made of polymer elastic materials and are fixedly connected to each other, such that each leg portion (11) and each nose portion (12) can be connected and combined as one piece. Further disclosed is a non-pneumatic tire comprising the multi-segment support.

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.

This invention relates to the field of new energy vehicles, specifically to a vehicle anti-rollback control method, device, and vehicle. It includes the following steps: When the vehicle is in a parking position, if the vehicle meets the torque compensation conditions, the base torque and rolling resistance weighted torque are added to obtain the target compensation torque for the motor, and torque adjustment control is performed. The rolling resistance weighted torque is updated as follows: an initial value of the rolling resistance weighted torque is set and stored; the torque T_g1 of the motor controlled by torque control is obtained; when the motor speed remains at zero, the time difference t_diff is calculated, and the current motor torque T_g2 is obtained. When the time difference is greater than the preset time difference t_diff1, the rolling resistance weighted torque is: (t_diff-t_diff1) / t_diff1*(T_g2-T_g1). If the absolute value of the difference between the calculated rolling resistance weighted torque and the stored rolling resistance weighted torque is greater than or equal to a preset threshold for the difference in rolling resistance weighted torque, then it is updated; otherwise, it is not updated. If the current vehicle meets the speed control conditions, speed control is performed, controlling the motor speed to zero. This prevents the vehicle from rolling backward and ensures vehicle safety.

The utility model relates to the technical field of well lids, in particular to an assembly type cast iron resin well lid which comprises a cast iron well lid outer ring and a resin center well lid, and a center well lid hole matched with the resin center well lid is formed in the middle of the cast iron well lid outer ring. The top end face of the resin center well lid is flush with the top end face of the cast iron well lid outer ring, the automobile rolling resistance can be guaranteed, signal transmission inside and outside the well can be guaranteed, meanwhile, the well lid can be conveniently opened in a knocking mode when the well lid is frozen in northern severe cold areas, and the well lid is particularly suitable for frozen areas.

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%].

The invention discloses a method and system for calculating the influence of electric vehicle tire rolling resistance on energy consumption based on cold region working conditions, and belongs to the field of electric vehicle energy consumption calculation. An existing electric vehicle energy consumption calculation method has the defects in the aspects of calculation precision, environmental adaptability and the like. According to the method, a multi-factor coupled tire rolling state finite element model under the low-temperature working condition is constructed by coupling the environment temperature, the road surface condition, the running speed, the tire pressure and the vertical load condition; through a finite element model, strain energy density accumulated values of all tire rubber material units are extracted, all the tire rubber material units are partitioned and labeled according to angles, then the strain energy density accumulated values are calculated, and a tire rolling energy consumption loss model is obtained; through calculation of the tire rolling energy consumption loss and the energy consumption of the electric vehicle, energy consumption caused by tire rolling is obtained, and then the influence of the tire rolling resistance on the energy consumption is obtained. The calculation precision of the energy consumption of the electric vehicle is improved through a multi-factor coupling verification model such as the temperature and the road surface.

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 present invention discloses a wheel, which includes a hub, a ring-shaped tread, and support blocks disposed between the hub and the ring-shaped tread. A gas storage chamber for storing compressed air or inert gas is provided inside the hub. The wheel of the present invention has no risk of flat tires or air leakage, and is more economical and environmentally friendly for replacement and maintenance; moreover, the wheel can bear higher air pressure, has higher stiffness performance and lower rolling resistance. The present invention also discloses a vehicle.

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)