A multi-purpose tire with high balance stability

Abstract

The present invention discloses a multi-purpose tire with high balance stability, comprising a crown, a shoulder and a sidewall, the surface of the crown is provided with a plurality of patterns, the upper end of the shoulder is connected to the crown, the upper end of the sidewall is connected to the shoulder, the sidewall comprises an upper sidewall curve and a lower sidewall curve, the upper sidewall curve and the lower sidewall curve are connected to form an inverse parabola shape, the vertex of the inverse parabola is located at 1 / 5-1 / 3 of the section width B, and the arc radius at the vertex of the inverse parabola is 20-50mm; an anti-scratch line is provided between the upper sidewall curve and the shoulder, the width E of the anti-scratch line is 20-60mm, and the lower sidewall curve is 15-50mm above the wheel rim; and a plurality of rubber reinforcing ribs are provided on the outer circumference of the sidewall. The present invention adopts an inverse parabola-shaped sidewall, the inclination angle of the upper sidewall curve in the sidewall is greater than the inclination angle of the lower sidewall curve, has a higher buffer deformation capacity, can absorb lateral force, and increases the tire's anti-skid ability and stability.

Description

Technical Field

[0001] The invention relates to a multi-purpose tire with high balance stability, belonging to the technical field of tires. Background Art

[0002] When a traditional tire is driving, due to the radial load and centrifugal force, the outer diameter of the tire increases significantly, and the section width decreases accordingly. The shape and size of the tire change greatly, resulting in a reduction in the tire contact area and weak lateral stability. When driving on slopes or uneven roads, the lateral deformation of the contact area increases, the anti-skid ability decreases, and it is difficult to control and stabilize. Due to the reduction in contact area, the pressure per unit area increases, and the pattern in contact with the ground sinks, which is more obvious especially on soft soil roads, requiring stronger traction, so the existing tires have poor stability.

[0003] Utility model patent CN214324814U discloses a tire with uniform ground pressure distribution. The ratio of the radius TR1 of the first crown arc of the tire to the nominal section width NSW of the tire is in the range of 3.5<TR1 / NSW<5, the ratio of the radius TR2 of the second crown arc to the nominal section width NSW of the tire is in the range of 0.7<TR2 / NSW<1, the radius SR of the shoulder arc is 20mm<SR<40mm, the ratio of the length L1 of the first crown arc to the distance TAW between the two shoulder points P at both ends of the tire is in the range of 0.26<L1 / TAW<0.30, and the ratio of the length L2 of the second crown arc to the distance TAW between the two shoulder points P at both ends of the tire is in the range of 0.2<L2 / TAW<0.24. The ground pressure of the tire is more uniform. On this basis, further optimization design is made. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a multi-purpose tire with high balance stability.

[0005] In order to achieve the above-mentioned object, the present invention adopts a multi-purpose tire with high balance stability, comprising a crown, a shoulder and a sidewall, wherein the surface of the crown is provided with a plurality of patterns, the upper end of the shoulder is connected to the crown, the upper end of the sidewall is connected to the shoulder, the sidewall comprises an upper sidewall curve and a lower sidewall curve, the upper sidewall curve and the lower sidewall curve are connected to form an inverse parabola shape, the vertex of the inverse parabola is located at 1 / 5-1 / 3 of the section width B, and the arc radius at the vertex of the inverse parabola is 20-50 mm;

[0006] An anti-scratch line is provided between the upper sidewall curve and the shoulder, the width E of the anti-scratch line is 20-60 mm, and the lower sidewall curve is 15-50 mm above the wheel rim;

[0007] A plurality of rubber reinforcing ribs are arranged on the outer circumference of the sidewall.

[0008] In some embodiments, the utility tire is an agricultural tire or an off-the-road tire.

[0009] In some embodiments, the arc radius at the vertex of the inverse parabola of the agricultural tire is 20-40 mm, the width E of the anti-scratch line is 20-40 mm, and the lower sidewall curve is 15-20 mm above the wheel rim;

[0010] The arc radius at the vertex of the reverse parabola of the engineering machinery tire is 40-50 mm, the width E of the anti-scratch line is 40-60 mm, and the lower sidewall curve is 30-50 mm above the wheel rim.

[0011] In some embodiments, the angle between the upper sidewall curve of the agricultural tire and the horizontal plane is 35-40°, and the angle between the lower sidewall curve and the horizontal plane is 10-15°.

[0012] In some embodiments, the angle between the upper sidewall curve of the engineering machinery tire and the horizontal plane is 35-50°, and the angle between the lower sidewall curve and the horizontal plane is 20-30°.

[0013] In some embodiments, the ratio of the running width b to the section width B of the agricultural tire is 0.92-0.95.

[0014] In some embodiments, the number of ground contact pairs of the tread pattern on the agricultural tire is 3-4 pairs.

[0015] In some embodiments, the rubber reinforcement ribs are evenly distributed along the circumferential direction of the sidewall and a certain gap is provided between two adjacent rubber reinforcement ribs.

[0016] In some embodiments, the curvature of the rubber reinforcement rib matches the curvature of the sidewall.

[0017] In some embodiments, the sidewall cord ply comprises 2 to 4 layers.

[0018] Compared with the prior art, (1) the multi-purpose tire of the present invention has a high balance and stability and adopts a sidewall in the shape of an inverted parabola. The inclination angle of the upper sidewall curve in the sidewall is greater than the inclination angle of the lower sidewall curve. It has a higher buffering deformation capacity, can absorb lateral force, and improves the tire's anti-skid ability and stability; (2) a plurality of rubber reinforcing ribs are installed on the surface of the sidewall to increase the sidewall strength and reduce the risk of sidewall puncture and damage; (3) the widened running surface increases the tire contact area, disperses the ground contact pressure, and has excellent traction and lateral stability; (4) the sidewall cord layer adopts a 2-4 layer structure, and a smaller cutting angle is used to ensure that the sidewall has sufficient tensile deformation capacity and buffering performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a partial schematic diagram of the pattern development of the agricultural tire of the present invention;

[0021] Figure 2 for Figure 1 AA local view;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the agricultural tire of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the engineering tire of the present invention;

[0024] In the figure: 1, crown, 2, sidewall, 21, upper sidewall curve, 22, lower sidewall curve, 3, shoulder, 4, vertex of the inverted parabola, 5, rubber reinforcement rib, 6, agricultural tire pattern, 7, anti-scratch line, 8, engineering tire pattern; B is the section width, b is the running surface width, D is the outer diameter, d is the tread diameter, F is the tread width, and E is the anti-scratch line width. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below with the help of accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0026] In the description of the present invention, it is necessary to understand that the terms "inside", "outside", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0027] like Figure 1-Figure 4As shown, a multi-purpose tire with high balance stability comprises a crown 1, a shoulder 3 and a sidewall 2, wherein the surface of the crown 1 is provided with a plurality of patterns, the upper end of the shoulder 3 is connected to the crown 1, the upper end of the sidewall 2 is connected to the shoulder 3, the sidewall 2 comprises an upper sidewall curve 21 and a lower sidewall curve 22, the upper sidewall curve 21 and the lower sidewall curve 22 are connected to form an inverse parabola shape, the vertex 4 of the inverse parabola is located at 1 / 5-1 / 3 of the section width B, and the arc radius at the vertex 4 of the inverse parabola is 20-50 mm;

[0028] An anti-scratch line 7 is provided between the upper sidewall curve 21 and the shoulder 3, the width E of the anti-scratch line 7 is 20-60 mm, and the lower sidewall curve 22 is 15-50 mm above the wheel rim;

[0029] A plurality of rubber reinforcing ribs 5 are provided on the outer circumference of the sidewall 2 .

[0030] In some embodiments, the multi-purpose tire is an agricultural tire or an engineering machinery tire;

[0031] The arc radius at the vertex 4 of the inverse parabola of the agricultural tire is 20-40 mm, the width E of the anti-scratch line 7 is 20-40 mm, and the lower sidewall curve 22 is 15-20 mm above the wheel rim (i.e., the distance above the wheel rim after assembly with the wheel rim is 15-50 mm, which is also a kind of protection for the wheel rim), which can effectively prevent the carcass cord from being folded and piled up. During the driving process, especially on uneven roads, the sidewall of the agricultural tire of the present invention has high flexibility and flexion, can absorb lateral force, keep the tire running in a straight line, and increase the tire's anti-skid ability and stability;

[0032] The arc radius at the vertex 4 of the inverse parabola of the engineering machinery tire is 40-50mm, the width E of the anti-scratch line 7 is 40-60mm, and the lower sidewall curve 22 is 30-50mm above the wheel rim, which can effectively avoid the folding and accumulation of the carcass cord. When the engineering machinery tire with a hard crown and soft sidewall is driven in a harsh outdoor environment, the stress is bound to be concentrated on the two shoulders and the bead part, and the support of the two shoulders and the bead part must be guaranteed. Therefore, the upper sidewall curve 21 of the engineering machinery tire of the present invention is 40-60mm below the shoulder 3 (that is, the width of the anti-scratch line 7), and the lower sidewall curve 22 is 30-50mm above the wheel rim to ensure that the shoulder and the bead part have strength.

[0033] In some embodiments, the angle between the upper sidewall curve 21 of the agricultural tire and the horizontal plane is 35-40°, and the angle between the lower sidewall curve 22 and the horizontal plane is 10-15°. The angle between the upper sidewall curve 21 of the engineering machinery tire and the horizontal plane is 35-50°, and the angle between the lower sidewall curve 22 and the horizontal plane is 20-30°, which is conducive to the buffering deformation of the sidewall. During driving, if debris is caught in the groove, the upper curve has a large inclination angle, which is convenient for the tire to clean itself.

[0034] In some embodiments, the ratio of the running surface width b to the cross-sectional width B of the agricultural tire is 0.92-0.95. The present invention adopts a widened running surface, and the running surface width is close to the cross-sectional width, which improves the ground contact width and lateral stability of the tire.

[0035] In some embodiments, the number of ground contact pairs of the tread on the agricultural tire is 3-4 pairs (under static load, 3-4 pairs of treads are on the ground at the same time), the contact area between the tire and the ground is increased, the degree of sinking of the tire in the soil is reduced, and the damage to the soil is reduced, so it has excellent traction.

[0036] In some embodiments, Figure 3 As shown, the rubber reinforcement ribs 5 are evenly distributed along the circumferential direction of the sidewall 2 and a certain gap is set between two adjacent rubber reinforcement ribs 5. The curvature of the rubber reinforcement ribs 5 matches the curvature of the sidewall 2. The bottom of the rubber reinforcement ribs 5 is integrated with the sidewall 2, which can not only fix the shape of the sidewall, but also form a protective barrier, increase the strength of the sidewall, and provide rigidity where the tire needs it. The gaps between the reinforcement ribs form grooves, which are conducive to heat dissipation when the sidewall is flexed and deformed; the rubber reinforcement ribs 5 can reduce the risk of puncture and damage to the sidewall in harsh working environments.

[0037] In some embodiments, when the tire section width increases, the cushioning performance decreases due to the increase in the ground contact width and the increase in the sidewall cord angle. The main factors affecting the cushioning performance in the cord layer structure are the cord angle and the number of cord layers. The sidewall cord layer of the present invention adopts a 2-4 layer structure and a smaller cutting angle to ensure that the sidewall has sufficient tensile deformation capacity and cushioning performance.

[0038] Example 1

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, an agricultural tire with high balance stability comprises a crown 1, a shoulder 3 and a sidewall 2, the surface of the crown 1 is provided with a plurality of agricultural tire patterns 6, the upper end of the shoulder 3 is connected to the crown 1, the upper end of the sidewall 2 is connected to the shoulder 3, the sidewall 2 comprises an upper sidewall curve 21 and a lower sidewall curve 22, the upper sidewall curve 21 and the lower sidewall curve 22 are connected to form an inverse parabola shape, the vertex 4 of the inverse parabola is located at 1 / 4 of the section width B (that is, the depth of the inverse parabola is 1 / 4 of the section width), and the arc radius at the vertex 4 of the inverse parabola is 30 mm;

[0040] An anti-scratch line 7 is provided between the upper sidewall curve 21 and the shoulder 3, the width E of the anti-scratch line 7 is 30 mm, the lower sidewall curve 22 is 20 mm above the wheel rim, the angle between the upper sidewall curve 21 of the agricultural tire and the horizontal plane is 35°, the angle between the lower sidewall curve 22 and the horizontal plane is 15°, and the ratio of the running surface width b to the cross-sectional width B of the agricultural tire is 0.95; a plurality of rubber reinforcing ribs 5 are provided on the outer circumference of the sidewall 2.

[0041] The agricultural tire of Example 1 is made by using conventional rubber materials and conventional tire processing methods (it is only necessary to adjust the mold according to the appearance of the agricultural tire).

[0042] The performance of the agricultural tire prepared in Example 1 and the agricultural tire of conventional structure were analyzed and compared. The results are shown in Tables 1 and 2 below. Table 1 shows the performance of the tire; Table 2 shows the static load performance of the tire, wherein the static load test conditions are: test rim W18, ambient temperature 23.2°C, test air pressure 160kPa, and test load 3875kg.

[0043] Table 1 Performance of agricultural tires of Example 1 and conventional structures

[0044]

[0045]

[0046] Table 2 Tire static load performance

[0047]

[0048] Note: Tire section height = (outer diameter of inflated tire - nominal diameter of rim) / 2; Tire section height under load = static radius of tire under load - nominal diameter of rim / 2; Sinking amount = Tire section height - Tire section height under load; Sinking rate = Sinking amount / inflated tire section height x 100%; Ground contact coefficient = ground contact length / ground contact width; Average ground contact pressure = test load / ground contact area under load; Hardness coefficient = test load / (ground contact area under load x test air pressure).

[0049] From the analysis of Table 1, it can be seen that the tension fatigue of the sidewall of the present application can reach 714,000 times, which is much greater than the 456,000 times of the conventional tire (comparative example). This shows that in the agricultural tire of the present invention, by designing the sidewall into an inverse parabolic shape, the buffering deformation capacity of the sidewall is improved, and the anti-skid ability and stability of the tire are increased; at the same time, a number of rubber reinforcement ribs are installed on the surface of the sidewall to increase the strength of the sidewall and reduce the risk of puncture and damage to the sidewall.

[0050] From the analysis of Table 2, it can be seen that the average ground contact pressure, ground contact coefficient and hardness coefficient of the tire of the present application are all smaller than those of the conventional agricultural tire, while the sinking rate is higher than that of the conventional agricultural tire. This indicates that the ground contact area of ​​the tire of the present invention is increased and the lateral stability is enhanced. When the tire is traveling on a slope or uneven road surface, it can buffer the lateral deformation during ground contact and has a strong anti-skid ability. As the ground contact area increases and the pressure per unit area decreases, when in contact with the ground, the degree of sinking of the tire in the soil can be reduced, the damage to the soil can be reduced, and it has a stronger traction force.

[0051] Example 2

[0052] An engineering tire with high balance stability, comprising a crown 1, a shoulder 3 and a sidewall 2, wherein the surface of the crown 1 is provided with a plurality of engineering tire patterns 7, the upper end of the shoulder 3 is connected to the crown 1, the upper end of the sidewall 2 is connected to the shoulder 3, the sidewall 2 comprises an upper sidewall curve 21 and a lower sidewall curve 22, the upper sidewall curve 21 and the lower sidewall curve 22 are connected to form an inverse parabola shape, the vertex 4 of the inverse parabola is located at 1 / 5 of the section width B, and the arc radius at the vertex 4 of the inverse parabola is 40 mm;

[0053] An anti-scratch line 7 is provided between the upper sidewall curve 21 and the shoulder 3, the width E of the anti-scratch line 7 is 40 mm, the lower sidewall curve 22 is 30 mm above the wheel rim, the angle between the upper sidewall curve 21 and the horizontal plane is 35°, the angle between the lower sidewall curve 22 and the horizontal plane is 30°, and the ratio of the running surface width b to the cross-sectional width B is 0.92; a plurality of rubber reinforcing ribs 5 are provided on the outer circumference of the sidewall 2.

[0054] The engineering tire of Example 2 is made by using conventional rubber materials and conventional tire processing methods (it only needs to adjust the mold according to the appearance of the engineering tire).

[0055] The performance of the engineering tire prepared in Example 2 and the engineering tire of conventional structure were analyzed and compared, and the results are shown in Table 3. Table 3 shows the static load performance of the tire, wherein the static load test conditions are: test rim 22.00 / 3.0, ambient temperature 23.2°C, test air pressure 400kPa, test load 14000kg.

[0056] Table 3 Tire static load performance

[0057]

[0058]

[0059] Note: Tire section height = (outer diameter of inflated tire - nominal diameter of rim) / 2; Tire section height under load = static radius of tire under load - nominal diameter of rim / 2; Sinking amount = Tire section height - Tire section height under load; Sinking rate = Sinking amount / inflated tire section height x 100%; Ground contact coefficient = ground contact length / ground contact width; Average ground contact pressure = test load / ground contact area under load; Hardness coefficient = test load / (ground contact area under load x test air pressure).

[0060] From the analysis of Table 3, it can be seen that the average ground pressure, ground coefficient and hardness coefficient of the tire of the present application are all smaller than those of the engineering tire of conventional structure, while the sinking rate is higher than that of the engineering tire of conventional structure. This shows that the sidewall of the tire of the present invention adopts an inward-concave inverse parabola shape, which can increase the weight of the tire and the amount of tire sinking. After inflation, it can increase the tire contact area, disperse the ground pressure, and have excellent traction and lateral stability. The pressure at each point on the contact surface is uniform and its limit pressure is also low, which is suitable for driving in the wild.

[0061] When the center of gravity of the loader moves forward and the rear wheels are tilted unsteadily during loading, or when the bulldozer slips during bulldozing operation, the tire of the present invention slips less than traditional tires, operates more stably, has higher bulldozing efficiency, and can significantly improve operating efficiency.

[0062] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

Claims

1. A multi-purpose tire with high balance stability, comprising a crown (1), a shoulder (3) and a sidewall (2), wherein the surface of the crown (1) is provided with a plurality of patterns, the upper end of the shoulder (3) is connected to the crown (1), and the upper end of the sidewall (2) is connected to the shoulder (3), wherein: The sidewall (2) comprises an upper sidewall curve (21) and a lower sidewall curve (22), wherein the upper sidewall curve (21) and the lower sidewall curve (22) are connected to form an inverse parabola shape, the inverse parabola vertex (4) is located at 1 / 5-1 / 3 of the cross-sectional width B, and the arc radius at the inverse parabola vertex (4) is 20-50 mm; An anti-scratch line (7) is provided between the upper sidewall curve (21) and the tire shoulder (3), the width E of the anti-scratch line (7) is 20-60 mm, and the lower sidewall curve (22) is 15-50 mm above the wheel rim; A plurality of rubber reinforcing ribs (5) are provided on the outer circumference of the sidewall (2); The angle between the upper sidewall curve (21) and the horizontal plane is 35-40°, and the angle between the lower sidewall curve (22) and the horizontal plane is 10-15°; or the angle between the upper sidewall curve (21) and the horizontal plane is 35-50°, and the angle between the lower sidewall curve (22) and the horizontal plane is 20-30°.

2. A multi-purpose tire with high balance stability according to claim 1, characterized in that: The multi-purpose tire is an agricultural tire or an engineering machinery tire.

3. A multi-purpose tire with high balance stability according to claim 2, characterized in that: The arc radius at the vertex (4) of the inverse parabola of the agricultural tire is 20-40 mm, the width E of the anti-scratch line (7) is 20-40 mm, and the lower sidewall curve (22) is 15-20 mm above the wheel rim; The arc radius at the vertex (4) of the reverse parabola of the engineering machinery tire is 40-50 mm, the width E of the anti-scratch line (7) is 40-60 mm, and the lower sidewall curve (22) is 30-50 mm above the wheel rim.

4. A multi-purpose tire with high balance stability according to claim 2, characterized in that: The ratio of the running surface width b to the section width B of the agricultural tire is 0.92-0.

95.

5. A multi-purpose tire with high balance stability according to claim 2, characterized in that: The number of ground contact pairs of the tread pattern on the agricultural tire is 3-4 pairs.

6. The multi-purpose tire with high balance stability according to claim 1, characterized in that: The rubber reinforcing ribs (5) are evenly distributed along the circumferential direction of the sidewall (2), and a certain gap is provided between two adjacent rubber reinforcing ribs (5).

7. A multi-purpose tire with high balance stability according to claim 1 or 6, characterized in that: The curvature of the rubber reinforcing rib (5) matches the curvature of the sidewall (2).

8. The multi-purpose tire with high balance stability according to claim 1, characterized in that: The sidewall (2) has 2 to 4 layers of cord fabric.

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