466 results about "Radial tire" patented technology

The invention relates to the technical field of tire simulation design, in particular to a radial tire contour rapid design and generation method and system and a computer program. According to the method, firstly, a finite element model is generated according to a material distribution diagram of an original tire, then tire outer contour parameters are adjusted according to a preset performance target, and a corresponding basic vector model is generated. The method comprises the following steps: extracting node information of an original model and a basic vector model, endowing a weight coefficient, and calculating a tire finite element model with target performance; and finally, determining an optimal weight coefficient by using an optimization algorithm, and generating a tire outer contour curve meeting performance requirements through curve fitting. According to the method, the design efficiency is remarkably improved, the dependence on the personal ability of designers is reduced, and more accurate and reliable tire optimization design is achieved.

Aiming at long-time snowfields, especially radial tires, the utility model provides a winter and summer dual-purpose nail-free snow tire pattern suitable for ice and snow pavements, which comprises a tread pattern, the tread pattern comprises pattern blocks arranged along the circumferential direction of the tire and pattern grooves arranged along the circumferential direction of the tire, a pattern groove I is arranged at the center of the width direction of the tire, and a pattern groove II is arranged at the center of the width direction of the tire. A pattern block I, a pattern groove II, a pattern block II, a pattern groove III, a pattern block III, a pattern groove IV, a pattern block IV, a pattern groove V and a pattern block V are sequentially arranged from the pattern groove I to the left and the pattern groove II to the right, and the width of the pattern groove I, the width of the pattern groove III and the width of the pattern groove V are smaller than the width of the pattern groove II and the width of the pattern groove IV. The requirements for ice and snow braking performance and handling stability in winter are met preferentially, the requirement for wear resistance in summer is met, and the tedious tire changing link is avoided.

The present invention relates to the field of tire finite element simulation methods, and in particular to a finite element tire simulation rapid convergence method, application and program product using a virtual rim. The present invention establishes an equivalent virtual rim model to achieve relative constraints on the contact position between the virtual rim and the tire, thereby changing the contact state between the tire and the rim, which can greatly improve the convergence of tire finite element analysis under large strain, multiple working conditions and large load conditions. It has been verified that the simulation results using the virtual rim are highly consistent with those using the actual rim. The method improves the analysis efficiency and shortens the research and development cycle while ensuring the analysis accuracy. The present invention is suitable for finite element simulation of various tires such as all-steel radial tires, semi-steel radial tires, bias tires, engineering tires, etc.

The invention discloses an all-steel truck radial tire, and relates to the technical field of radial tires. The outer contour section width SW, the lower side plate height LSH and the tire bead part positioning line width TTZ of the tire are optimally designed, and under the constraint of given technical parameters, the stress deformation of the tire bead part of the tire is small; meanwhile, in the structural design, the tire body cord fabric endpoint height HSC, the chafer outer side endpoint height HWC.O, the chafer inner side endpoint height HWC.I, the hard apex upper endpoint height HHBF, a tire bead part integral reinforcing layer arranged among the tire body cord fabric, the apex and the steel wire ring, and a tire bead part integral reinforcing layer arranged among the tire body cord fabric, the apex and the steel wire ring are matched; the tire body cord fabric and the chafer inner side reinforcing layer arranged between the tire body cord fabric and the inner side end point of the chafer are optimally designed, and new requirements on the strength of the reinforcing layer and the strength and modulus of cord thread coating rubber are met; deformation and modulus matching of the soft apex and the hard apex are deeply explored and verified on formula materials, so that stress deformation of the whole tire bead part is reduced, early-stage cracks at a tire body cord fabric end point, an outer / inner side end point of a tire chafer, an upper end point of the hard apex and a widest position of a steel wire ring are reduced, and the service life of the tire is effectively prolonged.

The utility model discloses a low-noise high-humidity skiing land radial tire which comprises tire shoulder pattern blocks and central pattern blocks, the tire shoulder pattern blocks and the central pattern blocks are radially arranged on a tire tread, the tire tread adopts a symmetrical design, and the tire shoulder pattern blocks and the central pattern blocks are arranged from outside to inside from the tire shoulder pattern blocks to the central pattern blocks. According to the utility model, by optimizing the shape and the arrangement of the patterns, the noise of the tire is effectively reduced, the noise problem of the snow tire is improved, the risk that the wet and slippery performance of the tire is reduced and the tire slips under the condition that accumulated water is accumulated on a road surface after accumulated snow is melted in the patterns of the snow radial tire in the prior art is solved, and the snow performance is ensured on the basis of ensuring the snow performance.

The invention provides a low-rolling-resistance and high-wet-grabbing pneumatic radial tire, which belongs to the technical field of tires, and comprises a tread and a circumferential groove extending along the circumferential direction of the tread, the contour between the highest point of the tread and the end point of one side of the tread is sequentially divided into a first arc section, a second arc section, a third arc section and a fourth arc section, the radius TR1 of the first section of arc, the radius TR2 of the second section of arc, the radius TR3 of the third section of arc and the radius TR4 of the fourth section of arc meet the following relation: TR1: TR2: TR3: TR4 = 2.3: 1.9: 1.6: 1; the number of the circumferential grooves is five, the five circumferential grooves sequentially comprise a central water-drop-shaped pattern groove, two pattern grooves close to the center and two shoulder water-drop-shaped pattern grooves from the center to the two sides of the tread, and the central water-drop-shaped pattern groove and the shoulder water-drop-shaped pattern grooves are grooves which are self-closed in a loading state; according to the invention, the tire structure design, the pattern design and the formula design are optimized, so that the tire has the ultimate durability, low rolling resistance and full-life-cycle high-wet-grip performance at the same time.

The utility model provides a one-step method small-diameter fitting forming drum for a farm tire. The one-step method small-diameter fitting forming drum comprises a main shaft assembly; the middle drum assembly is arranged on the outer side of the main shaft assembly in a sleeving mode and is driven by the main shaft assembly to rotate, and the outer surface of the middle drum assembly can expand and contract; the side drum assembly is arranged on the outer side of the main shaft assembly in a sleeving mode and driven by the main shaft assembly to rotate, the side drum assembly is located on the axial side face of the middle drum assembly, the outer surface of the side drum assembly can axially move and be arranged in an expanding and shrinking mode, and when the side drum assembly axially moves, an avoiding area can be formed by the side drum assembly and the middle drum assembly; when the middle drum assembly and / or the side drum assembly expand / shrink, the flush relation between the outer surface of the middle drum assembly and the outer surface of the side drum assembly can be changed; and the locking ring assembly is located between the middle drum assembly and the side drum assembly, and the locking ring assembly is arranged in an expanding and shrinking mode. The agricultural radial tire forming machine solves the problem that an agricultural radial tire forming machine in the prior art is low in automation level.

The invention provides an all-steel radial tire body cord shoulder bending multiple control method which comprises the following steps: processing white rubber into a rubber sheet by using an open mill, and isolating two sides of the rubber sheet by using plastic cloth liners; cutting the rubber sheet into rubber strips with specified sizes; when the tire blank is formed, the rubber strip is attached outwards along the tire body reverse wrapping end point, and the position of the rubber strip is marked on the lower side of the tire side edge portion through a white crayon; carrying out X-ray detection after the tire blank is vulcanized, and confirming the shoulder bending multiple of the tire body cord thread; the method has the advantages that the problem of the bending multiple of the shoulder of the tire body cord thread can be accurately judged by performing section cutting and observing the state of the white rubber at the marking position of the white crayon, accurate adjustment is performed according to the problem, the tire body cord thread is ensured to be bent by 1-2 times without thread display in the tire, the service performance of the tire is improved, and the service life of the tire is prolonged.

Provided is a pneumatic radial tire for passenger vehicles in which the cross-sectional width SW of the tire and the outer diameter OD of the tire satisfy a predetermined relationship, and an end of the carcass (an end of a carcass turn-up portion when the carcass has the carcass turn-up portion) in one tire width-direction half that is on the inner side when the tire is mounted on a vehicle is located on the inner side in the tire radial direction than an end of the carcass turn-up portion in the other tire width-direction half that is on the outer side when the tire is mounted on a vehicle.

The invention discloses a low-rolling-resistance and high-abrasion truck radial tire, and relates to the technical field of tire design, the truck radial tire comprises a tire body, a tread, a tire body, a sidewall, a tire bead, a belted layer, a steel wire ring and apex, the relation of the outer contour of the tire body is h / D > = 1.2% and < = 5.2%, the radial height difference between the end point of the outer contour of the tread and the middle point of the outer contour of the tread is h, and the width of the tire body is 0.5 mm. The vertical distance from the widest end point position in the belted layer to the grounding contour is D, the relationship of the inner contour of the tire body is (Gs-h) / Gc is greater than or equal to 0.98 and less than or equal to 1.02, the vertical distance from the end point of the outer contour of the tread to the inner contour is Gs, and the vertical distance from the midpoint of the outer contour of the tread to the inner contour is Gc. The design scheme of the low-rolling-resistance and high-abrasion truck radial tire is obtained by starting from key design elements of the tire and considering the relation between the rolling resistance and the abrasion of the tire, more fuel oil can be saved, and the abrasion mileage is longer.

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 utility model provides all-steel engineering radial tire forming equipment. The all-steel engineering radial tire forming equipment comprises a forming drum, the first forward and reverse wrapping device and the second forward and reverse wrapping device are located on the two sides of the axial direction of the forming drum respectively, and the second forward and reverse wrapping device is movably arranged relative to the forming drum; the cord fabric feeding device and the rubber part feeding device are located on the two sides of the forming drum in the circumferential direction respectively; the tire cylinder transfer ring is located on the side, away from the forming drum, of the second forward and reverse wrapping device, and the tire cylinder transfer ring is movably arranged in the axial direction of the forming drum; the shaping drum and the forming drum are coaxially arranged; the belted layer drum and the forming drum are coaxially arranged; the belted layer feeding device is located on the circumferential side face of the belted layer drum; and the belted layer transfer ring is arranged between the shaping drum and the belted layer drum. The utility model solves the problem of low tire production efficiency in the prior art.

The invention relates to the technical field of tire manufacturing, and discloses a low-rolling-resistance truck radial tire which comprises a tread, a sidewall, a belted layer, a tire body, a steel wire ring and steel wire wrapping cloth, the outer contour of the tread is of an arc-shaped structure on a tire interface, the arc length of the tread is L, the arc length L adopts the design of two sections of tangent arcs, and the arc length L is larger than the arc length L; the tread is provided with three pattern grooves which divide the tread into four same pattern blocks, the three pattern grooves are composed of two conventional open type longitudinal grooves and a Y-shaped longitudinal groove in the longitudinal direction, and the Y-shaped longitudinal groove is located between the two open type longitudinal grooves. According to the truck radial tire with the low rolling resistance, by optimizing the structural design, the pattern design and the formula design of the tire, the tire has the ultra-low rolling resistance performance, and meanwhile eccentric wear and different wear can be effectively reduced.

The present invention discloses a system for automatically generating the forming and pressing action trajectory of a radial tire embryo, including a pressing device. A login module is arranged in the pressing device, a detection module is arranged in the pressing device, a data information library is arranged in the pressing device, and a pressing module is arranged in the pressing device. The login module is electrically connected to the detection module, the login module is electrically connected to the data information library, the data information library is electrically connected to the detection module, the data information library is electrically connected to the pressing module, the pressing module is electrically connected to the detection module, an equipment terminal is electrically connected to the pressing device, and a probe is electrically connected to the pressing device. The present invention relates to a system for automatically generating the forming and pressing action trajectory of a radial tire embryo, which has the characteristics of being able to automatically match and perform pressing and matching data to sub-devices.

The utility model relates to a tread pattern structure of a light-duty radial tire. The tread pattern structure comprises a tire tread, transverse patterns and longitudinal patterns, wherein the transverse patterns and the longitudinal patterns are arranged on the tire tread; the tire tread (1) is composed of ten equal segmented molds, a central longitudinal pattern block (5) is arranged in the center of the tread, S-groove-bottom longitudinal straight grooves (2), longitudinal zigzag pattern grooves (3) and longitudinal pattern blocks (6) which are in the same direction are evenly distributed in the direction from the center line in the circumferential direction of the tire tread to the two sides of the tire tread respectively, arc transition design is adopted for the groove bottoms, heat dissipation shoulder grooves are distributed in the shoulder portions of the tire, and the longitudinal pattern blocks (6) are arranged in the longitudinal straight grooves (2) and the longitudinal zigzag pattern grooves (3). Shoulder heat dissipation is improved, and shoulder cracks are avoided. Compared with the prior art, the tire adopting the pattern form has higher wear resistance, the pattern adopts the design of two longitudinal main grooves, two longitudinal zigzag main grooves and auxiliary heat dissipation shoulder grooves, and enlarged apex and super-strong framework materials are used, so that the probability of early damage of the tire caused by eccentric wear, non-uniform wear, stone clamping prevention and the like is reduced.

The utility model relates to a tread pattern structure of an all-steel truck tubeless radial tire. The tread pattern structure comprises a tire tread, transverse patterns and longitudinal patterns, wherein the transverse patterns and the longitudinal patterns are arranged on the tire tread; the tire tread is composed of ten equal segmented molds, four straight grooves, four S-shaped variable groove bottoms and three pattern blocks are arranged on the tire tread, transverse and longitudinal streamline shallow groove staggered design is arranged on each pattern block, full-arc transition design is adopted for the groove bottoms, and thermometer type heat dissipation shoulder grooves are distributed in the shoulder of the tire. The functional warning effect is achieved while heat dissipation of the shoulders is improved, and diseases caused by the problem that the shoulders generate heat are avoided. Compared with the prior art, the tire adopting the pattern form provided by the utility model has the advantages that the appearance is more beautiful and smoother, the layering sense is realized, the wear resistance is higher, the eccentric wear resistance is higher, and the failure rate is lower.

The invention discloses a seam allowance wear-resistant rubber for a truck radial tire, and belongs to the field of tires. In order to solve the problem of low air tightness of the bead wear-resistant rubber in the prior art, the bead wear-resistant rubber is prepared from the following components: a raw rubber composition, a carbon black composition, stearic acid, zinc oxide, an anti-aging agent composition, protective wax, softening oil, a resin mixture, light magnesium oxide, insoluble sulfur, an accelerant mixture, a scorch retarder CTP and a hardening reinforcing agent. The process is simple and convenient to operate, the components and the process are optimized, so that the air tightness of the seam allowance rubber material is higher, the rubber material, the filler and the chemical material are dispersed more uniformly, the air tightness of the rubber material is improved, and the aging resistance is improved.

The invention belongs to the technical field of rubber processing and aircraft tire manufacturing, and particularly relates to a rubber composition, a preparation method thereof and application of the rubber composition as wave-shaped steel wire coating rubber of an aircraft radial tire. The rubber composition provided by the invention is prepared from 100 parts of natural rubber, 78 to 100 parts of a reinforcing system, 1.2 to 1.5 parts of a silane coupling agent, 3.5 to 6 parts of a bonding system, 0.3 to 0.5 part of a bonding promoter, 3.5 to 5.3 parts of an aging protection system, 2 to 5.7 parts of a crosslinking system, 6 to 6.5 parts of a crosslinking activation system, 5 to 8 parts of a plasticizing system and 3 to 5 parts of tackifying resin. The rubber composition provided by the invention has the advantages of excellent heat resistance, low compression fatigue temperature rise, high tensile strength and high elongation at break, and can form good adhesion with a wavy steel wire, so that the service life of the aviation radial tire is remarkably prolonged, the safety performance of the aviation radial tire is remarkably improved, and the puncture resistance of the aviation radial tire is effectively enhanced.

The invention discloses an all-steel radial tire shoulder pad rubber structure and a tire. The width of a pad rubber is 35%-45% of the width of a tread, the thickness of the middle part is 6-8 mm, the thickness of the edge is 2-3 mm, the included angle between the edges of the two sides and the center line of the tread is 15-25 degrees, and three positioning points are arranged. By optimizing the size parameters and the positioning mode of the cushion rubber and matching with the gradual change thickness design and the specific material formula, the deformation of the cushion rubber in the tire forming process is reduced. According to the structure, a transition layer is further arranged between the cushion rubber and the first belted layer, and interlayer combination is enhanced. Compared with a traditional structure, the flatness of the belted layer can be improved, end point shear stress is reduced, tire shoulder faults are reduced, and the durability of the tire is improved.

The invention relates to the technical field of tire simulation design, in particular to a radial tire bead pressure simulation method and system and a program product. The method comprises the following steps: establishing an axial symmetry finite element model based on a material distribution diagram of a tire and a rim; generating a three-dimensional tire and rim model through a periodic rotation rule, and automatically defining a'killing 'unit and a retaining unit of a rim adjustable block in combination with a life-death unit technology; in the simulation process, after the rim expands to the nominal diameter, different deformation constraints are applied, and the actual test working condition of the tire bead pressure is simulated. Compared with the prior art, the modeling efficiency is improved, the steps of model editing and result processing are simplified, meanwhile, the simulation precision is improved by 10% or above, and the error with the actual measurement result is small. The method is suitable for design and optimization of radial tires, and has the characteristics of low cost, high precision and high efficiency.

The invention provides a one-step method small-diameter fitting forming drum for a farm tire and a fitting process of the one-step method small-diameter fitting forming drum. The one-time method small-diameter fitting forming drum for the agricultural tire comprises a main shaft assembly, the middle drum assembly is arranged on the outer side of the main shaft assembly in a sleeving mode and is driven by the main shaft assembly to rotate, and the outer surface of the middle drum assembly can expand and contract; the side drum assembly is arranged on the outer side of the main shaft assembly in a sleeving mode and driven by the main shaft assembly to rotate, the side drum assembly is located on the axial side face of the middle drum assembly, the outer surface of the side drum assembly can axially move and be arranged in an expanding and shrinking mode, and when the side drum assembly axially moves, an avoiding area can be formed by the side drum assembly and the middle drum assembly; when the middle drum assembly and / or the side drum assembly expand / shrink, the flush relation between the outer surface of the middle drum assembly and the outer surface of the side drum assembly can be changed; and the locking ring assembly is located between the middle drum assembly and the side drum assembly, and the locking ring assembly is arranged in an expanding and shrinking mode. The problem that in the prior art, an agricultural radial tire forming machine is low in automation level is solved.

The application discloses a kind of automatic feeding and discharging devices for semi-steel radial protruding white ring tire production, including hollow base, the top of the hollow base is provided with screw lifting assembly, the output structure transmission connection of screw lifting assembly is equipped with support shaft, and the one end of support shaft is equipped with pneumatic clamping component, the bottom of screw lifting assembly is provided with the rotary adjusting mechanism that is sleeved in the inside of hollow base one side.The automatic feeding and discharging device for semi-steel radial protruding white ring tire production, can be in the rotating pre-clamping process of second brake servo motor through first gear, second gear meshing transmission rotating shaft, screw lifting assembly, second brake servo motor makes inverted T type gear shaft linkage engagement two straight toothed plates by synchronous belt, and then by two straight toothed plates through corresponding transmission plate linkage corresponding curved elastic pressure frame plate, is clamped to the center by two curved elastic pressure frame plates synchronous to the multiple tire bodies in stacked state before clamping and maintains clamping effect.

The utility model discloses a radial tire for engineering machinery, which relates to the field of tire design and comprises a tire tread, a linear pattern wall and a U-shaped pattern wall are fixedly mounted on the periphery of the tire tread, a first reinforcing rib is fixedly mounted between the linear pattern wall and the U-shaped pattern wall, and a second reinforcing rib is fixedly mounted between the linear pattern wall and the U-shaped pattern wall. Side pattern walls are fixedly mounted on the periphery of the tire tread and located on the front side and the rear side of the linear pattern wall, shoulder pattern walls are fixedly mounted on the periphery of the tire tread and located on the front side and the rear side of the side pattern walls, and shoulder grooves are formed in the surfaces of the shoulder pattern walls. The height of the first reinforcing ribs is reasonably arranged, the connecting strength between the pattern walls is enhanced, the overall tear resistance is improved, the second reinforcing ribs are matched, the overall rigidity of the tire is remarkably enhanced, the performance of the tire is improved, and the service life of the tire is prolonged.

The invention discloses a civil aviation radial tire corrugated protective layer rubber and a preparation method thereof, and the rubber adopts a technical method that 1 # smoked sheet rubber is used as a main body material, N330 carbon black is used as a reinforcing system, N46 engine oil is used as a plasticizer, insoluble sulfur, an accelerant DZ and the like are used as vulcanizing agents, and an adhesive RS, C9 resin and tackifying resin HT-M are used as an adhesive system. The rubber material with high adhesion, impact resistance, tear resistance, puncture resistance, low heat generation and good fatigue resistance is prepared through a certain mixing process, and the rubber material serving as the corrugated protective layer rubber material of the civil aviation radial tire has good adhesion performance of a framework material (aramid fiber rope), higher physical performance, lower heat generation performance and good anti-fatigue performance. The damage resistance of foreign object puncture resistance and mechanical damage resistance of the civil aviation radial tire is improved, so that the durability of the tire is improved.

The present invention discloses an airtight layer of an engineering radial tire, a production process thereof, and a method for detecting its tear resistance, and relates to the field of tire technology. The technical solution is as follows: (1) the airtight layer comprises the following components in parts by weight: 60-80 parts of brominated butyl rubber, 10-15 parts of natural rubber, 10-15 parts of chlorosulfonated polyethylene, and 55-60 parts of carbon black; (2) the exhaust line groove of the vulcanization bladder is arc-shaped, with a depth h'=1.65-1.8mm, a width W'=7.5-7.8mm, a surface chamfer R1'=3.2-3.5mm, a groove bottom chamfer R2'=1.5-1.8mm, and a groove cross-sectional area of 5.5-6mm. 2 The present invention adjusts the formula design of the tire airtight layer, increases the tear resistance of the airtight layer, improves the size design of the exhaust line of the vulcanizing bladder, can extend the service life of the vulcanizing bladder, and reduce aging and cracking at the groove position of the vulcanizing bladder.

The PET cord for manufacturing a cap ply and the cap ply manufactured using same according to the present invention have low heat shrinkage characteristics and a moderately low modulus even at high temperatures compared to PET having general heat shrinkage characteristics and high-temperature modulus, and exhibits a low modulus in a low elongation range, thereby solving disadvantages in the manufacturing process and providing higher reinforcement than nylon. In addition, the tire according to the present invention in which the bonding relationship between the tread and steel belt layer adjacent to the cap ply is adjusted can overcome the physical limitations that may occur when PET is used as a cord material of the cap ply.

This invention discloses a radial tire with a 0° fiber belt layer and its processing method, relating to the field of tire technology. It includes a steel belt layer, with a 0° fiber belt layer wound around its outer surface. The 0° fiber belt layer is covered by a tire crown, and the steel belt layer encloses a tire carcass. The processing method includes the following steps: S1, raw material conveying: the steel belt layer, the 0° fiber belt layer, and the tire crown are sequentially conveyed to a forming module via a conveying module; S2, steel belt layer forming; S3, 0° fiber belt layer forming; S4, tire crown forming; S5, tire blank transfer and assembly with the tire carcass. The 0° fiber belt layer tightens the steel belt layer, ensuring the radial tire's excellent impact resistance and durability. This allows for accurate alignment of the steel belt layer's oblique joints, ensuring the accuracy of subsequent processing, improving the processing efficiency of the steel belt layer, avoiding stress concentration caused by edge warping, and precisely solving the edge warping problem.

The invention discloses an all-steel load-bearing radial tire and relates to the technical field of radial tires. The present invention optimizes the design of the tire's outer profile section width SW, lower side plate height LSH, and bead positioning line width TTZ. Under the constraints of given technical parameters, the stress deformation of the tire bead area is small. At the same time, in terms of structural design, the carcass cord end point height HSC, the bead chafer outer end point height HWC.O, the bead chafer inner end point height HWC.I, the hard apex rubber upper end point height HHBF, the bead area integral reinforcement layer arranged between the carcass cord, apex rubber and steel ring, and the bead chafer inner reinforcement layer arranged between the carcass cord and the bead chafer inner end point are optimized, and new requirements are set for the strength of the reinforcement layer and the strength and modulus of the cord covering rubber. In terms of formula materials, the deformation and modulus matching of soft and hard apex rubbers are also deeply explored and verified, so that the stress deformation of the entire bead area is reduced, thereby reducing early cracks at the carcass cord end point, the bead chafer outer / inner end point, the hard apex rubber upper end point, and the widest position of the steel ring, effectively extending the service life of the tire.

This invention relates to pneumatic radial tires which exhibit improved rolling resistance (provide better fuel economy) and improved performance characteristics. More particularly, this invention relates to the structure of radial ply tires for heavy load vehicles such as trucks, buses, and the like. It is based upon that finding that a defined profile of the outer surface of the sidewall portion can lead to a tire with reduced rolling resistance and a reduced generation of heat. The reduction in rolling resistance is obtained by a specific shaping of the bead portion of the tire which allows a bead mass reduction with an acceptable trade-off with regard to bead durability.

The application provides a kind of tire cornering stiffness calculation device, method and computer terminal, specifically relates to automobile tire stiffness calculation method technical field.The method comprises: the tire is radial tire, the calculation method comprises: obtaining the geometric parameters, material parameters and construction parameters of the tire;According to the geometric parameters and the material parameters, the pattern stiffness of the tire and the crown stiffness of the tire are calculated;According to the construction parameters of the tire, the cornering stiffness correction coefficient of the tire is calculated;According to the pattern stiffness of the tire, the crown stiffness and the cornering stiffness correction coefficient of the tire, and the cornering stiffness function obtained by pre-simulation, the cornering stiffness of the tire is calculated.Through the calculation method provided by the application, the accuracy of tire cornering stiffness can be improved, and reliable data guarantee is provided for vehicle control.