A tire comprising a steel cord fabric

Abstract

The present invention relates to the technical field of tires, and specifically discloses a tire including a steel cord fabric, provided with a tread, and a gas retention layer is provided on the tread, including: a covering layer, connected to the inner side of the tread and extending to wrap around both sides of the tread; a steel cord fabric buffer layer, connected to the inner side of the covering layer; a steel cord wrapped with a colloid is arranged inside the steel cord fabric buffer layer, the steel cords are arranged in layers on the gas retention layer, and the colloids are stacked to form a honeycomb structure, and the covering layer is used to fix the steel cord fabric buffer layer. By stacking the steel cords wrapped with colloids to form a honeycomb structure and arranging them on the gas retention layer, the present invention provides a steel cord fabric buffer layer to establish a stable adhesion and frictional contact relationship, ensuring that the force on each steel cord is balanced, thereby improving the overall stability and tension of the tread.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and particularly to a tire comprising a steel cord fabric. Background Art

[0002] As a skeleton material, the steel cord fabric is the main load-bearing component in a tire, mainly used as the carcass and the steel cord fabric layer. The rigidity of the steel cord fabric layer largely determines many service performances of the tire, such as strength and the contour after inflation. Its load is borne by each steel wire that makes up the cord fabric, and it is necessary for each steel wire to bear the force evenly. During actual use, when the tire is under load, if the steel wires in the cord fabric are not tightened evenly, the tightened steel wires in the cord fabric bear a large force. Especially when the instantaneous impact force from road obstacles exceeds the strength of a certain steel wire, this steel wire will break first, and other steel wires will also break immediately, causing a series of chain reactions: the carcass cord fabric causes a zipper blowout, and the cord fabric in the steel cord fabric layer causes a crown blowout, resulting in a flat tire during vehicle driving and causing traffic accidents.

[0003] Therefore, a tire comprising a steel cord fabric is needed, which can optimize the force distribution of the tire, ensure that the steel wires in the cord fabric are highly tensioned and flat when the tire deforms under impact and bumps, and avoid the occurrence of flat tire problems. Summary of the Invention

[0004] The present invention provides a tire comprising a steel cord fabric, which can improve the stiffness and strength of the tire and ensure that the steel wires in the cord fabric are highly tensioned and flat when the tire deforms under impact and bumps.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A tire comprising a steel cord fabric is provided with a tread, and a gas-retaining layer is arranged on the tread, including:

[0007] A covering layer, connected to the inner side of the tread, is provided with a first covering layer, a second covering layer and a third covering layer. The first covering layer and the second covering layer are arranged parallel to the tread, and the third covering layer is arranged crosswise to the tread and extends to wrap both sides of the tread;

[0008] A steel cord fabric buffer layer, connected to the inner side of the covering layer;

[0009] Steel cord wires wrapped with a colloid are arranged inside the steel cord fabric buffer layer. The steel cord wires are arranged in layers on the gas-retaining layer, and the colloids are stacked to form a honeycomb structure. The covering layer is used to fix the steel cord fabric buffer layer.

[0010] Further, the steel cord fabric buffer layer includes:

[0011] A first steel cord wire, which is wrapped with two layers of colloid to form a first rubber column;

[0012] A second steel cord, the second steel cord is wrapped by a layer of colloid to form a second rubber column.

[0013] Furthermore, the radial cross-section of the first rubber column is set as a regular hexagon, the radial cross-section of the second rubber column is set as a triangle, and the relationship between the cross-sectional area S1 of the first rubber column and the cross-sectional area S2 of the second rubber column is S1 = 6S2.

[0014] Furthermore, a hollow structure is arranged inside the second rubber column, and the second steel cord is clamped in the hollow structure.

[0015] Furthermore, at least one layer of the first rubber column and two layers of the second rubber column are closely stacked to form the honeycomb structure, and the second rubber column is embedded in the gaps on the bottom side and the upper side of the steel cord fabric buffer layer.

[0016] Furthermore, the first steel cord and the second steel cord are multi-twisted steel wires;

[0017] The first steel cord is a fully penetrated structure for improving the bonding strength;

[0018] The second steel wire is a high-strength steel wire with a tight structure without external winding wires.

[0019] Furthermore, the second steel cord includes an S-twisted second steel cord and a Z-twisted second steel cord.

[0020] Furthermore, the strength of the first steel cord and the second steel cord is 3500 - 4500 MPa.

[0021] Furthermore, during the arrangement of the second rubber column, one Z-twisted second steel cord is arranged between every two S-twisted second steel cords.

[0022] Furthermore, the third covering layer is arranged in a cross arrangement with the tread at an angle of 48 - 55 degrees, extends and wraps around both sides of the tread, and the level difference between the third covering layer and the reverse wrapping end point of the steel cord fabric buffer layer is 10 - 20 mm.

[0023] The present invention provides a tire including a steel cord fabric. Compared with the prior art, its beneficial effects are as follows:

[0024] (1) By stacking the steel cords wrapped with colloid to form a honeycomb structure and arranging them on the air retention layer, and setting a steel cord fabric buffer layer, a stable bonding and frictional contact relationship is established, ensuring that the force on each steel wire is balanced, thereby improving the overall stability and tension of the tread;

[0025] (2) Cross-arranged with the tread through the third covering layer, and extending to wrap both sides of the tread, effectively protecting the tightness of the honeycomb structure arrangement, ensuring that when the tire deforms under impact and bumps, the steel wires in the cord fabric are highly tensioned and flat. Brief Description of the Drawings

[0026] Figure 1 is a schematic cross-sectional view of a tire provided by an embodiment of the present invention;

[0027] Figure 2 is a schematic structural view of a steel cord buffer layer provided by an embodiment of the present invention;

[0028] Among them, A1, A2, and A3 are schematic diagrams of the forces on the second rubber columns, and B1 is a schematic diagram of the forces dispersed layer by layer inside the steel cord buffer layer;

[0029] Figure 3 is a schematic structural view of a partial first rubber column and second rubber column intercepted by an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of the static pressure force situation for a period of time in an embodiment of the present invention;

[0031] Among them, T-1 is an experimental control group with an external force applied at a point to the right of the tire center line under a certain static pressure, and 71 is the point with the strongest local stress under this force condition;

[0032] T-2 is an experimental control group with an external force applied at a point on the tire center line under a certain static pressure, and 721, 722, 723, and 724 are the points with the strongest local stress under this force condition;

[0033] T-3 is an experimental control group with an external force applied at a point to the left of the tire center line under a certain static pressure, and 73 is the point with the strongest local stress under this force condition;

[0034] Figure 5 is a schematic diagram of the instantaneous impact limit force situation in an embodiment of the present invention;

[0035] Among them, C1 is a schematic diagram of the impact force direction, C2 is a schematic diagram of the impact force conduction, C3 is a schematic diagram of the reaction force direction generated by the buffer layer, and C4 is a schematic diagram of the reaction force conduction generated by the buffer layer.

[0036] In the figure, 1 - tread; 2 - first covering layer; 3 - second covering layer; 4 - steel cord buffer layer; 41 - first rubber column; 411 - first steel cord; 412 - first rubber layer; 413 - second rubber layer; 42 - second rubber column; 421 - second steel cord; 4211 - S-twisted second steel cord; 4212 - Z-twisted second steel cord; 422 - hollow structure; 423 - third rubber layer; 5 - air retention layer; 6 - third covering layer. Detailed Embodiment

[0037] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0038] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0039] In the prior art, during the tire forming process, multiple layers of materials including a pre-composite layer, a carcass ply, a belt layer, and a tread layer are successively laminated onto a metal forming drum, and the performance of the tire in various aspects is strengthened through the superposition of multiple layers of structures.

[0040] This application improves the steel cord ply structure in the prior art. By stacking steel cord wires wrapped with a colloid to form a honeycomb structure and arranging it on the air retention layer, a steel cord buffer layer is set up. By changing the characteristic of laminating layer by layer in the prior art and integrating the rubber columns into an overall buffer layer, a stable adhesion and frictional contact relationship is established, ensuring that the force on each steel wire is balanced, thereby improving the overall stability and tension of the tread.

[0041] This application also improves the wrapping property of the cover layer in the prior art, effectively protecting the tightness of the honeycomb structure arrangement and ensuring a high and flat tension of the steel wires in the tire cord.

[0042] The present invention provides a tire including a steel cord ply, which can improve the stiffness and strength of the tire and ensure that the steel wires in the cord are highly tensioned and flat when the tire deforms under impact and bumps.

[0043] To achieve the above object, the present invention provides the following embodiments:

[0044] Refer to Figure 1 As shown, a tire including a steel cord ply in this embodiment includes:

[0045] Tread 1, cover layer, steel cord buffer layer 4, and air retention layer 5; among them, the cover layer is connected to the inner side of the tread 1, and is provided with a first cover layer 2, a second cover layer 3, and a third cover layer 6. The first cover layer 2 and the second cover layer 3 are arranged parallel to the tread 1, and the third cover layer 6 is arranged crosswise to the tread 1 and extends to wrap around both sides of the tread 1; the steel cord buffer layer 4 is connected to the inner side of the cover layer; the air retention layer 5 is connected to the inner side of the steel cord buffer layer 4; in addition, steel cords wrapped with colloids are arranged inside the steel cord buffer layer 4, and the steel cords are arranged in layers on the air retention layer 5, and the colloids are stacked to form a honeycomb structure, and the cover layer is used to fix the steel cord buffer layer 4.

[0046] Specifically, by stacking steel cords wrapped with colloids to form a honeycomb structure and arranging them on the air retention layer 5, the steel cord buffer layer 4 is provided, and the characteristics of layer-by-layer lamination in the prior art are changed to integrate the rubber columns into an overall buffer layer, establishing a stable adhesion and frictional contact relationship, ensuring that the stress on each steel wire is balanced, thereby improving the overall stability and tension of the tread 1, and enhancing the wrapping property of the cover layer, effectively protecting the tightness of the honeycomb structure arrangement, and ensuring that the steel wires in the cord fabric are highly tensioned and flat when the tire deforms under impact and bumps.

[0047] Combined with Figures 2-3 As shown, the steel cord buffer layer 4 includes:

[0048] First steel cord 411 and second steel cord 421, where the first steel cord 411 is wrapped with two layers of colloids to form a first rubber column 41; and the second steel cord 421 is wrapped with one layer of colloid to form a second rubber column 42.

[0049] Continue to refer to Figure 2 As shown, the radial cross-section of the first rubber column 41 is set as a regular hexagon, the cross-section of the second rubber column 42 is set as an equilateral triangle, and the relationship between the cross-sectional area S1 of the first rubber column 41 and the cross-sectional area S2 of the second rubber column 42 is S1 = 6S2.

[0050] Specifically, in order for the steel cord buffer layer 4 to have a high reinforcement effect and reliability, a stable and strong adhesion is established between the coated rubber and the steel wire. Among them, the first steel cord 411 is first wrapped with a first colloid layer 412 and then wrapped with a second colloid layer 413, and the second steel cord 421 is wrapped with a third colloid layer 423. The first colloid is selected as an emulsion colloid with excellent flexibility and permeability, and the second colloid and the third colloid are selected as solid colloids with excellent structural strength.

[0051] Specifically, for the first rubber column 41, the first steel cord 411 and raw rubber are respectively supplied to a rubber extruder, the molten rubber is coated on the first steel cord 411, and then it is extruded and formed from a mold with a specific shape; for the second rubber column 42, the second steel cord 421 and raw rubber are respectively supplied to a rubber extruder, the molten rubber is coated on the second steel cord 421, and then it is extruded and formed from a mold with a specific shape.

[0052] Specifically, for the first steel cord 411 and the second steel cord 421, a wire ultrasonic coiling measurement system is used in cooperation with a variable air pressure brake to pay off the wires, which can control the structural position relationship between the wires, change the laying of each layer of the cord fabric into the laying of the steel cords in detail, and complete the construction of the overall buffer layer.

[0053] It can be understood that each structure, or the overall structure, shape, size, quantity, material, etc. can be appropriately changed according to the gist of the present invention.

[0054] It can be understood that when the steel cord buffer layer 4 is impacted by a force, the force B1 will be dispersed layer by layer, that is, the force on each local point of the tread 1 part can be supported by the overall structure of the steel cord buffer layer 4.

[0055] Refer to Figure 2 As shown, a hollow structure 422 is arranged inside the second rubber column 42, and the second steel cord 421 is clamped in the hollow structure 422.

[0056] Specifically, the hollow structure 422 inside the second rubber column 42 is mainly subjected to forces in three directions A1, A2, and A3. It can be understood that during the conduction process, the propagation media of the forces in the three directions A1, A2, and A3 have undergone multiple changes, and finally are conducted to the hollow medium, that is, it will only cause internal air vibration, reducing the local friction effect, and the second steel cord 421 inside has extremely strong toughness and can effectively resist torsional force and return to the initial state.

[0057] Refer to Figure 2 As shown, at least one layer of the first rubber column 41 and two layers of the second rubber column 42 are closely stacked to form a honeycomb structure, and the second rubber column 42 is embedded in the gaps on the bottom side and the upper side of the steel cord buffer layer 4.

[0058] Specifically, the second rubber column 42 improves the missing part of the honeycomb structure on the plane and plays a key strengthening role for it.

[0059] Continue to refer to Figure 2 As shown, the first steel cord 411 and the second steel cord 421 are multi-twisted steel cords;

[0060] The first steel cord 411 has a fully permeable structure and is used to improve the bonding strength;

[0061] The second steel cord 421 is a compact structure made of high-strength steel wires without external winding wires.

[0062] Specifically, the first steel cord 411 with a full-penetration structure can be combined with the first rubber layer 412 to enhance stability, and the second steel cord 421 with a compact structure made of high-strength steel wires without external winding wires can effectively withstand internal vibrations.

[0063] Combined Figures 2-3 As shown, the second steel cord 421 includes an S-twisted second steel cord 4211 and a Z-twisted second steel cord 4212.

[0064] Continuing to combine Figures 2-3 As shown, the strength of the first steel cord 411 and the second steel cord 421 is 3500 - 4500 MPa.

[0065] Refer to Figure 3 As shown, during the arrangement process of the second rubber column 42, a Z-twisted second steel cord 4212 is arranged between every two S-twisted second steel cords 4211.

[0066] Specifically, during the arrangement process of the second rubber column 42, the twisting directions of the second steel cords 421 of adjacent second rubber columns 42 are different, including an S-twisted second steel cord 4211 and a Z-twisted second steel cord 4212. The S-twisted second steel cord 4211 is specifically right-twisted, while the Z-twisted second steel cord 4212 is specifically left-twisted. It can be understood that when the second steel cords 421 with opposite twists are arranged adjacent to each other, when they are stressed, a force that twists in the direction of untwisting in the opposite direction is generated, which can provide better support and compressive resistance at the surrounding points.

[0067] It can be understood that by strengthening the internal structure of the steel cord buffer layer 4, a stable bonding and frictional contact relationship is established to ensure that the stress situation of each steel wire is balanced. By embedding the second rubber column 42 into the gaps on the bottom side and the upper side of the steel cord buffer layer 4 and simultaneously setting a reinforcing structure to improve the strength and impact resistance of the steel cord buffer layer 4, and through the design of the hollow structure 422, a damping effect is achieved, the stability is improved, and the driving comfort is effectively improved.

[0068] Combined Figures 1-2 As shown, the third cover layer 6 is arranged in a cross pattern with the tread 1 at an angle of 48 - 55 degrees and extends to wrap around both sides of the tread 1. The level difference between the third cover layer 6 and the end point of the reverse wrapping of the steel cord buffer layer 4 is 10 - 20 mm.

[0069] It can be understood that the third cover layer 6 can greatly enhance the wrapping property of the cover layer, effectively protect the compactness of the honeycomb structure arrangement, and avoid problems such as rubber grinding and bending, assembly line cracking, and bead unseating.

[0070] The steel cord tire of the present invention has the following advantages after testing:

[0071] Combined Figures 1-4 As shown, based on "Tire Specifications, Dimensions, Inflation Pressures and Loads for Trucks" (GB / T 2977-2016), the following experiments are carried out according to the tire specifications, dimensions, inflation pressures and loads of automobiles. The steel cord buffer layer 4 of this embodiment is tested under static pressures of 500 N and 1000 N. Points are taken to the right of the tire center line, at the tire center line, and to the left of the tire center line. The external force is set as a single variable, and three groups of control experimental groups, namely T-1, T-2, and T-3, are set for static pressure recording. Two groups of control experimental groups with a hexagonal structure and a trapezoidal structure are set for instantaneous impact recording. Among them Figure 4 FIG. 9 is a schematic cross-sectional view of the steel cord buffer layer 4 under a static pressure of 1000 N, where points 71, 7, 21, 722, 723, 724, and 73 are all points with the strongest local stress.

[0072] Experiment on the force condition of static pressure impact.

[0073]

[0074] According to the above experimental data of the present invention, the deformation amount corresponding to the hexagonal structure specifically refers to the maximum deformation amount before the instantaneous impact rebound of the first rubber column 41, and the data corresponding to the stress of the second rubber column 42 or the tread 1 is specifically the stress at the adjacent position of the hexagonal structure and the second rubber column 42 or the tread 1; the deformation amount corresponding to the trapezoidal structure specifically refers to the maximum deformation amount before the instantaneous impact rebound of the trapezoidal structure composed of the second rubber column bodies 42, and the data corresponding to the stress of the second rubber column 42 or the tread 1 is specifically the stress at the second rubber column 42 of the second steel cord in Z-twist inside the trapezoidal structure or the stress at the adjacent position to the tread 1; the stress of the second rubber column 42 specifically refers to the stress of the second rubber column 42 of the second steel cord in S-twist; the stress of the tread 1 refers to the stress formed by the steel cord buffer layer 4 on the tread 1 through the air retention layer 5. In this application, a reinforcing structure is provided at the points with the strongest stress in the structure. Among them, at 71 and 73, the impact force is gradually dispersed layer by layer and quickly returns to the initial state after the acting force disappears, while at 721, 722, 723, and 724, the second rubber column 42 is inlaid to provide key reinforcement, which can improve the effect of bearing static pressure and impact force and extend the service life of the tire.

[0075] Refer to Figure 5As shown in the figure, for the analysis of the instantaneous impact limit force-bearing situation in this embodiment, in the limit situation, the impact force C1 (schematic of the impact force direction) is jointly borne by the first rubber columns 41 on its two sides and the lower side. Among them, each force transmitted to the first rubber column 41 on the lower side will be gradually dispersed into forces in three directions layer by layer until it reaches the bottom and completes the downward dispersion. After reaching the bottom, there is a schematic of the impact force C2 conduction. Even if deformation occurs, the reaction force continues to act upward, that is, the schematic of the reaction force direction generated by the C3 buffer layer and the schematic of the reaction force conduction generated by the C4 buffer layer complete the second dispersion layer by layer. The axial force and the torsional force are both conducted multiple times, which helps to quickly restore the initial state and extend the service life.

[0076] Under the condition that only the tire control group is set as a single variable, the design of the present invention and the tire with the original cord ply structure were subjected to multiple impact verifications of the bead durability performance. The test was terminated when the tire developed cracks or zipper bursts, and the impact mass test was carried out according to the "Test Method for Impact Resistance of Automotive Tires" (GB / T 30195-2013) to judge the tire state.

[0077] According to the load index of the test tire, the test environment temperature was 24°C. Reasonable control of the falling height, impact angle, etc. was carried out to test the impact energy overload impact force, and the data comparison is as follows.

[0078]

[0079] Based on the above experimental data, it can be seen that compared with the tires with the original structure of the same level, the designed structure tire of the present invention effectively improves the bead impact resistance and durability performance of the steel cord tire.

[0080] After detection, the present invention has the following effects:

[0081] (1) By stacking the steel cord wrapped with colloid to form a honeycomb structure and arranging it on the air retention layer 5, and setting the steel cord buffer layer 4, a stable bonding and frictional contact relationship is established, ensuring that the force-bearing situation of each steel wire is balanced, thereby improving the overall stability and tension of the tread 1 and enhancing the strength of the tire.

[0082] (2) By arranging the third covering layer 6 in a cross pattern with the tread 1 and extending to wrap both sides of the tread 1, the tightness of the honeycomb structure arrangement is effectively protected, ensuring that the steel wires in the cord are highly tensioned and flat when the tire deforms under impact and bumps, improving the safety of the tire.

[0083] (3) By constructing a stable honeycomb-shaped structure, the force on each local point on the tread 1 can be supported by the overall structure of the steel cord buffer layer 4, and there are reinforcing structures at the points with the strongest stress. It can effectively bear the corresponding impact force, relieve the impact force layer by layer, and quickly restore the initial state after the acting force disappears, improving the service life of the tire.

[0084] (4) Through the design of the hollow structure 422, a shock-absorbing effect is achieved, stability is improved, and driving comfort is effectively enhanced.

[0085] Those of ordinary skill in the art can understand that although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tire comprising a steel cord carcass, provided with a tread (1), and an air retention layer (5) is arranged on the tread (1), characterized in that, Comprising: A cover layer, connected to the inner side of the tread (1), provided with a first cover layer (2), a second cover layer (3) and a third cover layer (6). The first cover layer (2) and the second cover layer (3) are arranged parallel to the tread (1), and the third cover layer (6) is arranged crosswise to the tread (1), extending and wrapping around both sides of the tread (1); A steel cord buffer layer (4), connected to the inner side of the cover layer; Inside the steel cord buffer layer (4), there are steel cords wrapped with colloid. The steel cords are arranged in layers on the air retention layer (5), and the colloids are stacked to form a honeycomb structure. The cover layer is used to fix the steel cord buffer layer (4); The steel cord buffer layer (4) includes: A first steel cord (411), which is wrapped by two layers of colloid to form a first rubber column (41); A second steel cord (421), which is wrapped by one layer of colloid to form a second rubber column (42); The radial cross-section of the first rubber column (41) is set as a regular hexagon, and the radial cross-section of the second rubber column (42) is set as a triangle. The relationship between the cross-sectional area S1 of the first rubber column (41) and the cross-sectional area S2 of the second rubber column (42) is S1 = 6S2; Inside the second rubber column (42), there is a hollow structure (422), and the second steel cord (421) is clamped in the hollow structure (422).

2. The tire comprising a steel cord according to claim 1, characterized in that, At least one layer of the first rubber column (41) and two layers of the second rubber column (42) are tightly stacked to form the honeycomb structure, and the second rubber column (42) is embedded in the gaps between the bottom side and the top side of the steel cord buffer layer (4).

3. The tire containing steel cord according to claim 1, wherein The first steel cord (411) and the second steel cord (421) are multi-twisted steel wires; The first steel cord (411) is of a fully permeable structure for improving the adhesion strength; The second steel cord (421) is of a high-strength steel wire and a tight structure without outer wrapping wires.

4. The tire comprising a steel cord according to claim 3, characterized in that, The second steel cord (421) includes an S-twisted second steel cord (4211) and a Z-twisted second steel cord (4212).

5. The tire comprising a steel cord according to claim 1, characterized in that, The strength of the first steel cord (411) and the second steel cord (421) is 3500 - 4500 MPa.

6. The tire comprising a steel cord according to claim 4, characterized in that, During the arrangement process of the second rubber column (42), one Z-twisted second steel cord (4212) is arranged between every two S-twisted second steel cords (4211).

7. The tire containing steel cord according to claim 1, wherein: The third cover layer (6) is arranged crosswise to the tread (1) at an angle of 48 - 55 degrees, extending and wrapping around both sides of the tread (1). The level difference between the third cover layer (6) and the reverse wrapping end point of the steel cord buffer layer (4) is 10 - 20 mm.

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