High-load, low-section and high-durability wide-base agricultural tire

Abstract

The utility model belongs to the technical field of rubber processing, and particularly discloses a wide-base agricultural tire with high load, low section and high durability. Comprising tire shoulders, a tire crown, a tire side wall, a tire body cord fabric layer and a tire bead, the tire shoulders are integrally circular and arranged on the two sides of the tire crown, the tire crown is located on the upper portion of the tire, patterns are arranged on the tire crown and arranged along the tire crown in an array mode, base rubber and a tire body buffer layer are arranged between the tire crown and the tire body cord fabric layer, and the tire bead is arranged between the tire crown and the tire body cord fabric layer. The tire bead is made of a double-layer steel wire ring, and the tire bead is arranged in the tire and located below the tire side wall. In practical application, the tire has the characteristics of shear resistance and low heat generation, and the durability of the tire product can be greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rubber processing, and specifically discloses a wide-base agricultural tire with high load, low section and high durability. Background Art

[0002] With the rapid development of the agricultural machinery industry and the increasing demand for large-horsepower machinery, agricultural tires need to cope with the challenges of heavier loads and complex operating environments, which has led to a surge in the demand for low-section wide-base tires such as the 45, 50, and 55 series. To meet these demands, the number of carcass plies and buffer layers in tire design has been increased to enhance the load-bearing capacity and puncture resistance. However, although this improvement has enhanced the tire strength, it has also brought problems such as increased shear force and heat accumulation, which in turn affect the rubber bonding strength, resulting in shoulder voiding and bead bursting, and shortening the tire life.

[0003] The all-steel radial tire with the patent application number 200720097978.X has a tread crown, a tread sidewall, a bead, a steel cord ply, a steel belt layer and an airtight layer. Its characteristics are: the steel belt layer is three layers, and a nylon ring belt winding layer that winds around the tire circumference is added above both ends of the third belt layer close to the inner wall of the tread crown. A nylon ring belt winding layer is added above both ends of the third belt layer close to the inner wall of the tread crown to reduce the deformation of the edge part of the belt layer and enhance the rigidity of the shoulder part, so as to reduce the heat accumulation generated by the deformation of the end part of the belt layer. The shear force of the above device is large, resulting in a shortened tire service life. Therefore, it is urgent for those skilled in the art to solve the above technical problems. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is that although the number of carcass plies and buffer layers of the agricultural tire increases, which improves the strength and puncture resistance of the tire, it also causes an increase in shear force and heat generation. After the heat accumulation reaches a certain temperature, the bonding strength between rubbers decreases, and then problems such as shoulder voiding and bead bursting occur at many positions of the tire material.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A wide-base agricultural tire with high load, low section and high durability, including a shoulder, a tread crown, a tread sidewall, a carcass ply and a bead; the shoulder is integrally arc-shaped and arranged on both sides of the tread crown, the arc radius of the tread crown is 120 mm - 160 mm, the tangent length between the shoulder and the tread sidewall is 10 mm - 15 mm, the thickness of the shoulder is less than the thickness of the tread crown, the tread crown is located at the upper part of the tire, a pattern is arranged on the tread crown, the pattern is arranged in an array along the tread crown, a base rubber and a carcass buffer layer are arranged between the tread crown and the carcass ply, the bead is made of a double-layer steel wire ring, and the bead is arranged inside the tire and below the tread sidewall.

[0007] Furthermore, the shoulder and the crown form a tread surface. The arc width of the tread surface is 600 mm - 750 mm, and the arc radius of the tread surface is 3000 mm - 3200 mm; the arc height h of the tread surface is 15 mm - 21 mm.

[0008] The arc width of the tread surface is 600 mm - 750 mm. Such a width design can provide a more stable grounding area, ensure good grip under different terrain conditions, improve traction and driving stability. Especially in wet or soft farmland soil, the arc radius of the tread surface is set at 3000 mm - 3200 mm. The larger arc radius helps to disperse the pressure of the tire on the ground, reduce the degree of soil compaction, is beneficial to protecting the soil structure, and at the same time reduces the tillage resistance and improves the operation efficiency. The arc height h of the tread surface is in the range of 15 mm - 21 mm. This height design can maintain sufficient flexibility to adapt to uneven ground while enhancing the tire's ability to resist deformation under high loads, reducing excessive compression of the tire under heavy pressure, thereby extending the service life of the tire and improving its wear resistance.

[0009] Furthermore, the ratio of the area of the tread pattern to the area of the tread surface is the tread pattern saturation, and the tread pattern saturation is 51% - 54%.

[0010] The tread pattern saturation within this range can ensure sufficient area of the tread pattern blocks to ensure good traction on the soil or road surface, while also allowing sufficient smooth areas to facilitate self-cleaning of the tire, reducing mud accumulation, thus providing better passability in muddy or unpaved conditions. The optimization of the tread pattern design reduces the direct wear area of the tread surface, enabling the tread pattern blocks to effectively disperse the pressure when carrying heavy loads, avoiding local excessive wear, and extending the service life of the tire. The reasonable setting of the tread pattern saturation increases the number of contact points between the tire and the ground. These contact points can better "grip" the ground, especially on wet or soft ground, improving the vehicle's handling stability and safety. By controlling the ratio of the tread pattern area to the tread surface, the heat generation problem during tire operation can be effectively managed. A lower tread pattern saturation helps to reduce the internal frictional heat generation when the tire rolls. Combined with other designs such as rounded shoulders and large arc crowns, it jointly reduces the heat generation in the shoulder part, thereby improving the overall durability of the tire. For agricultural tires, this range of tread pattern saturation can provide strong traction to meet the heavy load operation requirements such as plowing and transportation, while also maintaining the stable working performance of the tire under complex and harsh ground conditions, reducing the risk of voiding and tire blowouts.

[0011] Furthermore, a first bead wire and a second bead wire are disposed within the bead. The height from the cord ply of the first bead wire to the bottom of the tire is 40 - 50 mm, and the height from the cord ply of the second bead wire to the bottom of the tire is 70 - 90 mm.

[0012] The double bead wire structure greatly enhances the tensile strength and impact resistance of the tire bead area. Especially when operating under high load conditions, it can effectively prevent bead deformation or rupture, extend the service life of the tire. The different height arrangements of the two bead wires help to disperse and balance the huge stresses generated during heavy load and high-speed rotation of the tire, avoid stress concentration at a certain point of the bead, reduce local damage, and improve the overall structural stability of the tire. The design of the double bead wires enables the tire to withstand a greater weight without structural damage, which is particularly suitable for the requirements of high-load tires in modern agricultural machinery, improving the working efficiency and reliability of the tire. As the key part for fixing the tire on the rim, the reinforcement design of the double bead wires can effectively prevent the tire from slipping off the rim under extreme working conditions, and at the same time reduce the risk of bead burst, ensuring operation safety. Due to the use of the bladder curing method, the bottom compression rate is set between 40% - 50%, compared with about 95% of ordinary products. Such a design helps the cord ply to closely adhere to the rubber, enhances the adhesion strength between cord plies, and ensures the integrity and uniformity of the bead structure during the curing process.

[0013] Furthermore, the bead is made by bladder curing, and the bottom of the bead is compressed by 40% - 50%.

[0014] Bladder curing is a closed-mold curing method that can ensure that the bead area is completely wrapped by the bladder during the curing process, forming a uniform and dense curing layer, improving the sealing performance of the tire, preventing air leakage, and enhancing the overall airtightness of the tire. By compressing the bottom of the bead by 40% - 50% during the curing process, the bead structure can be made more compact, and the adhesion between the cord ply and the rubber can be made more firm, thus significantly enhancing the compressive strength and impact resistance of the bead. This is particularly important for agricultural tires that bear high-load operations. The appropriate compression ratio helps the stress to be evenly distributed in the bead structure, reduces local stress concentration, and prevents early damage to the bead part of the tire under heavy load and harsh working conditions, such as de-bonding or bursting. The combination of a reasonable compression ratio and the bladder curing process can effectively reduce the deformation of the tire during use, reduce heat accumulation, reduce rubber aging, and thus greatly improve the durability and service life of the tire. Bladder curing is a production method with a high degree of automation, which can ensure the consistency of each curing process, improve the stability of product quality, reduce production defects, and ensure that each tire can meet the designed performance standards.

[0015] Furthermore, a bead toe is provided at the bottom of the bead, and the width of the cord outside the bead toe is 40mm-50mm larger than the width of the bead toe.

[0016] The extra width of the cord on the outside of the bead toe provides a wider support base, which helps to disperse the stress concentration on the bead when it is under force, especially when the tire is subjected to side impact or traveling on rough roads. It can effectively reduce the risk of damage to the bead and improve the overall impact resistance of the tire. The wider cord coverage can better seal the bead toe area, reduce the problem of air leakage caused by foreign object penetration or wear in complex operating environments, and improve the safety and reliability of tire use. The wide cord design increases the rigidity of the tire sidewall, so that the sidewall deformation of the tire is reduced when turning or subjected to lateral force, thereby improving the vehicle's handling stability and driving safety. Especially under heavy load or high-speed driving conditions, by increasing the cord width, the fatigue damage to the bead toe area is reduced when the tire is subjected to repeated bending and torsional deformation, thereby significantly improving the durability of the tire and extending its service life. The wider cord structure also helps the tire fit closely to the rim, simplifying the assembly process, ensuring the stability of the tire after installation, and reducing tire problems caused by improper assembly.

[0017] The utility model has the following beneficial effects:

[0018] 1. By adopting a rounded shoulder design, a large arc crown and shoulder tangent design, and optimizing the material thickness and ratios of various tire parts, this new tire significantly improves its performance in endurance tests, with endurance significantly increased compared to existing products. This significantly extends the tire's service life, reduces replacement frequency, and reduces costs.

[0019] 2. Reducing the material thickness in the shoulder area changes the stress distribution, shifting shoulder stress toward the more flex-resistant sidewall. This effectively reduces shoulder shear force and heat generation. Optimized running surface width, height, and crown camber, along with appropriate tread saturation, work together to improve tire wear resistance and reduce unit pressure. This maintains overall tire performance while minimizing material damage caused by deformation and heat generation under high loads.

[0020] 3. The double wire bead design and unique cord tube height design, the 40%-50% compression rate at the bead bottom, and the cord width setting greatly enhance the strength and stability of the bead area, effectively solving the problems of shoulder derailment and bead bursting that are prone to occur under heavy loads. In addition, this design also improves the tire's self-cleaning, traction and passability, making it more suitable for agricultural operating environments with no road surface or poor conditions, thereby improving the vehicle's operating efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural schematic diagram of the present utility model.

[0022] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0023] Figure 3 a partial schematic diagram of the pattern.

[0024] Among them, there are: 1 - tread surface; 11 - crown; 12 - shoulder; 2 - sidewall; 3 - carcass ply; 4 - bead; 41 - first bead wire; 411 - first ply turn-up; 42 - second bead wire; 421 - second ply turn-up; 5 - toe; 6 - pattern; 7 - carcass buffer layer; 8 - carcass base rubber part. Specific embodiments

[0025] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so it cannot be understood as a limitation to the present utility model. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present utility model.

[0027] Referring to Figure 1 and Figure 2 , it can be known that a wide-base agricultural tire with high load, low section, and high durability includes a tread surface 1 located on the outer side of the tire. The tread surface 1 includes a crown 11 and a shoulder 12. A sidewall 2 is provided on the side of the tire, and a carcass ply 3 is provided on the inner side of the tire. A base rubber 8 and a carcass buffer layer 7 are sequentially provided between the crown 11 and the carcass ply 3. A bead 4 is provided at the bottom of the sidewall 2. A first bead wire 41 and a second bead wire 42 are provided inside the bead 4. The first bead wire 41 is wrapped by a first ply turn-up 411, and the second bead wire 42 is wrapped by a second ply turn-up 421. A toe 5 is provided outside the bead 4.

[0028] In one embodiment, the carcass ply 3 is cut and laid according to the tire specifications to ensure that the number and quality of the carcass ply 3 meet the design requirements. The first bead wire 41 and the second bead wire 42 are respectively placed at predetermined positions within the bead 4. The bead fabric cylinders 411 of the first bead wire 41 and the bead fabric cylinders 421 of the second bead wire 42 are pre-wrapped with bead wires in advance to enhance the bonding force between the bead wire and the ply and the structural stability. The bead 4 with the first bead wire 41 and the second bead wire 42 is placed at the bottom of the sidewall 2, ensuring that the bead 4 is correctly positioned and combined with the carcass ply 3. At this time, the first bead fabric cylinder 411 at the bottom of the bead 4 is 40 - 50 mm away from the bottom of the tire, and the second bead fabric cylinder 421 is 70 - 90 mm away from the bottom of the tire, which is used for compression control during the subsequent vulcanization process. The base rubber 8 is laid above the carcass ply 3, and then the carcass buffer layer 7 is covered to increase the elasticity and durability of the tire. The rubber materials for the designed tread 11 and shoulder 12 parts are laid on the carcass buffer layer 7, ensuring that the arc R of the tread 11 is designed as a large arc with R120 - R160, and the shoulder 12 is designed in a circular shape to reduce shear stress and optimize thermal management. According to the setting that the radian width b of the running surface 1 is 600 mm - 750 mm and the radian height h of the running surface is 15 mm - 21 mm, the tread pattern 6 is set on the tread 11, ensuring that the pattern saturation is between 51% - 54% to balance traction, self-cleaning, and wear resistance. The above pre-assembled tire components are placed into a bladder mold and vulcanized using the bladder vulcanization method. During the vulcanization process, by controlling the compression rate at the bottom to be 40% - 50%, it is ensured that all tire components are tightly combined, while avoiding structural defects caused by excessive compression. After vulcanization, the tire needs to go through a cooling process to ensure that the rubber material is fully cured and reaches the design performance. After cooling, quality inspections are carried out, including appearance inspection, dimensional measurement, and necessary performance tests such as pressure resistance, wear resistance, and durability tests, to ensure that the tire meets the design requirements.

[0029] Referring to Figure 3 , it can be seen that the tread pattern 6 is set on the tread 11, and the tread pattern 6 is arranged in a staggered manner left and right and arrayed along the radian direction of the tire.

[0030] In one embodiment, according to the usage conditions and performance requirements of the tire, the shape, depth, and arrangement of the tread pattern 6 are designed. Considering the working environment of agricultural tires, the tread pattern design needs to take into account self-cleaning, traction, and wear resistance to ensure good grip on wet or muddy ground. According to the tire specifications and the curvature of the tread surface 1, computer-aided design software is used to plan the layout of the tread pattern 6, ensuring that the tread pattern 6 is evenly distributed along the curvature direction of the crown 11 in a left-right staggered manner. This can optimize the ground contact performance of the tire, evenly distribute the load, and reduce uneven wear. According to the design drawing of the tread pattern 6, a mold is customized, and the shape and staggered arrangement pattern of the tread pattern 6 should be precisely engraved on the mold to ensure that the tread pattern 6 design can be accurately replicated during vulcanization. A base rubber part 8 is laid on the carcass ply 3 and the carcass buffer layer 7, and the crown 11 rubber compound is placed into the mold. The tread pattern 6 grooves inside the mold correspond to the designed tread pattern 6 pattern. During the vulcanization process, under high temperature and high pressure, the rubber compound flows to fill the tread pattern 6 grooves in the mold, and at the same time, the carcass ply, the carcass buffer layer, and the crown rubber compound are tightly bonded to form a complete tire structure.

[0031] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A wide-base agricultural tire with high load capacity, low cross-section, and high durability, characterized in that: It includes a shoulder, a crown, a sidewall, a carcass ply and a bead; the shoulder is integrally arc-shaped and arranged on both sides of the crown. The arc radius of the crown is 120 mm - 160 mm. The tangent length between the shoulder and the sidewall is 10 mm - 15 mm. The thickness of the shoulder is less than that of the crown. The crown is located at the upper part of the tire. There are tread patterns arranged on the crown. The tread patterns are arranged in an array along the crown. There is a base rubber and a carcass buffer layer arranged between the crown and the carcass ply. The bead is made of a double-layer steel wire ring and is arranged inside the tire and below the sidewall.

2. A wide-base agricultural tire with high load capacity, low section height, and high durability according to claim 1, characterized in that: The shoulder and the crown form a running surface. The arc width of the running surface is 600 mm - 750 mm, and the arc radius of the running surface is 3000 mm - 3200 mm; the arc height h of the running surface is 15 mm - 21 mm.

3. The wide-base agricultural tire with high load capacity, low cross-section, and high durability according to claim 2, characterized in that: The ratio of the area of the tread pattern to the area of the running surface is the tread pattern saturation, and the tread pattern saturation is 51% - 54%.

4. A wide-base agricultural tire with high load capacity, low cross-section and high durability according to claim 1, characterized in that: There is a first steel wire ring and a second steel wire ring arranged inside the bead. The height of the first ply cylinder of the first steel wire ring from the bottom of the tire is 40 - 50 mm, and the height of the second ply cylinder of the second steel wire ring from the bottom of the tire is 70 mm - 90 mm.

5. The wide-base agricultural tire with high load capacity, low section height and high durability according to claim 4, characterized in that: The bead is made by bladder curing, and the bottom of the bead is compressed by 40% - 50%.

6. The wide-base agricultural tire with high load capacity, low cross-section and high durability according to claim 5, characterized in that: There is also a toe arranged at the bottom of the bead. The width of the outer ply of the toe is 40 mm - 50 mm larger than the width of the toe.

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