Load-bearing tires

Abstract

The utility model proposes a load-resistant tire, which belongs to the field of tire technology, including a carcass and a bead, wherein the bead includes an apex rubber and a wire ring, the carcass is wrapped around the wire ring to the outside of the apex rubber, and the outside of the carcass is sequentially coated with a wire bead cloth, a first nylon bead cloth, and a second nylon bead cloth; wherein the first nylon bead cloth and the second nylon bead cloth are staggered and arranged in the circumferential direction in a forward direction, and are both in a cross state with the direction of the steel bead cloth cord; the first edge film is coated at one end of the steel bead cloth, and the second edge film is coated at the other end, and a layer of upper film is coated on the outside of the second edge film, wherein the upper film is located between the carcass and the first nylon bead cloth, and the thickness of the upper film is greater than the thickness of the second edge film, and the other end of the upper film is higher than the end of the carcass wrapping. The utility model load-resistant tire has the characteristics of improving the tire load-bearing performance and handling stability, and improving the service life of the tire.

Description

Technical Field

[0001] The utility model belongs to the technical field of tires, and in particular relates to a load-resistant tire. Background Art

[0002] In the commercial vehicle and heavy truck transportation industry, in order to maximize transportation benefits, some heavy-duty trucks prefer to transport large base weight goods while meeting regulatory requirements and ensuring safe driving. Load-bearing tires, as a type of tire specially designed to withstand heavy weight and high loads, are usually used for the above-mentioned vehicles.

[0003] The special structural design of load-bearing tires is aimed at improving the load-bearing performance, wear resistance and stability of tires. Through reasonable material distribution and structural adjustment, it ensures that load-bearing tires can operate stably under high load conditions and have a long service life. In the current development environment of the automotive industry, load-bearing tires face multiple challenges and opportunities such as market demand growth, technological innovation, environmental protection requirements and global competition: With the continuous improvement of the manufacturing technology and material technology of load-bearing tires, there are higher requirements for the load-bearing capacity, wear resistance and stability of load-bearing tires.

[0004] Therefore, providing a load-resistant tire with higher load-bearing performance and handling stability has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent.

[0006] The utility model provides a load-bearing tire, which solves the technical problem of insufficient load-bearing performance and handling stability of existing load-bearing tires, and has the characteristics of improving the load-bearing performance and handling stability of the tire and increasing the service life of the tire.

[0007] On the one hand, the utility model discloses a load-resistant tire, comprising a carcass and a tire bead, wherein the tire bead comprises an apex rubber and a wire ring, the carcass is wrapped around the wire ring and turned up to the outside of the apex rubber, and the outside of the carcass is sequentially coated with a wire bead cloth, a first nylon bead cloth, and a second nylon bead cloth; wherein the first nylon bead cloth and the second nylon bead cloth are staggered and arranged in the circumferential direction in a forward direction, and are both in a cross state with the direction of the steel wire bead cloth cord; the first edge wrapping film is coated at one end point of the steel wire bead cloth, and the second edge wrapping film is coated at the other end point, and a layer of upper adhesive film is coated on the outside of the second edge wrapping film, wherein the upper adhesive film is located between the carcass and the first nylon bead cloth, and the thickness of the upper adhesive film is greater than the thickness of the second edge wrapping film, and the other end point of the upper adhesive film is higher than the end point of the carcass wrapped up.

[0008] In some of the embodiments, the end points of the carcass turn-up are covered with edge-sealing films.

[0009] In some of the embodiments, the cutting angle of the steel cord in the steel wire cloth is 30°, and the steel cord is wrapped around the outer side of the carcass in a U-shaped application manner.

[0010] In some of the embodiments, the cutting angle of the inner cord of the first nylon cloth is 45°, and it is applied under the steel wire cloth, and both ends of the first nylon cloth cover the two end points of the steel wire cloth; the cutting angle of the inner cord of the second nylon cloth is 45°, and it is applied under the first nylon cloth, and both ends of the second nylon cloth cover the two end points of the first nylon cloth.

[0011] In some of the embodiments, the carcass steel cord density is 60 cords / dm, and the breaking strength of a single steel cord is 2225N.

[0012] Some of the embodiments further include a belt layer, wherein the belt layer steel cord density is 45 to 60 cords / dm, and the breaking strength of a single steel wire ranges from 860N to 2800N.

[0013] In some of the embodiments, the belt layers include, from the inside to the outside, a first belt layer, a second belt layer, a third belt layer and a fourth belt layer, wherein the breaking strength of a single steel wire in the first belt layer is 1850N, and the steel cord density is 48 wires / dm; the breaking strength of a single steel wire in the second belt layer is 2800N, and the steel cord density is 45 wires / dm; the breaking strength of a single steel wire in the third belt layer is 2800N, and the steel cord density is 45 wires / dm; the breaking strength of a single steel wire in the fourth belt layer is 860N, and the steel cord density is 40 wires / dm.

[0014] In some of the embodiments, the width ratio of the first belt layer, the second belt layer, the third belt layer and the fourth belt layer is 1.9:2.1:1.9:1.

[0015] In some of the embodiments, the inner diameter of the wire ring is 574-575 mm.

[0016] In some of the embodiments, a sidewall is also included, and the overlapping thickness between the sidewall and the apex rubber is 3-7 mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: the load-resistant tire of the utility model adds two layers of nylon bead cloth on the basis of the conventional bead, which can enhance the rigidity of the tire heel and enhance the load-resistant performance of the tire; the two layers of nylon bead cloth are staggered and arranged in the circumferential direction, and are in a cross state with the direction of the steel wire bead cloth cord, which can improve the tightening performance of the tire and ensure the handling stability of the tire; the two end points of the steel wire bead cloth are both edged with edge film, and the outer side of the second edge film is coated with a layer of upper film, and the thickness of the upper film is greater than that of the second edge film The thickness of the film is such that the other end of the upper film is higher than the end of the carcass wrap, which plays a role in dispersing the force from the transition steel wire to the rubber material; the inner diameter of the wire ring is set to 574-575mm. By increasing the inner diameter of the wire ring, it is ensured that there is enough space between the wire ring and the composite part, which can avoid the bead scratching the carcass, the bead mouth is not pressed firmly, and the composite part is misaligned during tire molding. The carcass is calendered with ultra-high strength steel cord, and each belt layer uses ultra-high strength and high ductility steel cord, which can effectively disperse the load and improve the load-bearing capacity and stability of the crown part of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 It is an enlarged structural schematic diagram of the belt layer of the load-bearing tire provided by an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the enlarged structure of the bead of the load-bearing tire provided by the embodiment of the utility model;

[0021] Figure 3 A schematic diagram of the steel wire cord and angle structure of the bead portion of a load-bearing tire provided by an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the nylon cord and angle structure of the bead area of ​​a load-bearing tire provided by an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the carcass cord and angle structure of a load-bearing tire provided by an embodiment of the utility model;

[0024] In the accompanying drawings: 1, crown, 2, sidewall, 3, carcass, 4, belt layer, 41, first belt layer, 42, second belt layer, 43, third belt layer, 44, fourth belt layer, 5, tire bead, 511, upper apex rubber, 512, lower apex rubber, 52, wire ring, 53, wire mouth cloth, 54, first nylon mouth cloth, 55, second nylon mouth cloth, 56, first edge film, 57, second edge film, 58, upper film, 59, edge sealing film;

[0025] α is the angle of the steel cord, β is the angle of the first nylon cord, and θ is the angle of the carcass steel cord. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present utility model. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0028] The utility model embodiment provides a load-resistant tire, referring to Figure 1 and Figure 2As shown, the load-resistant tire includes a crown 1, a sidewall 2, a carcass 3, a belt layer 4 and a bead 5, the bead 5 includes an apex rubber 51 and a wire ring 52, the carcass 3 is wrapped around the wire ring 52 to the outside of the apex rubber 51, and the outside of the carcass 3 is sequentially covered with a steel wire cloth 53, a first nylon cloth 54 and a second nylon cloth 55; wherein the first nylon cloth 54 and the second nylon cloth 55 are staggered and arranged in the circumferential direction, and are both in a cross state with the cord direction of the steel wire cloth 53. , to provide tightening performance for the tire; one end of the steel wire bead cloth 53 is covered with a first edge film 56, and the other end is covered with a second edge film 57, and the outer side of the second edge film 57 is covered with a layer of upper film 58, wherein the upper film 58 is located between the tire body 3 and the first nylon bead cloth 54, and the thickness of the upper film 58 is greater than the thickness of the second edge film 57, and the other end of the upper film 58 is higher than the reverse end of the tire body 3, which can disperse the force of the transition steel wire to the rubber material. The steel wire bead cloth 53 is wrapped on the outside of the tire body 3 in a U-shaped application manner, which can enhance the load-bearing performance of the tire; the cutting angle of the steel cord in the steel wire bead cloth 53, that is, the angle α between the cord and the vertical direction is 30°, which is at a certain angle with the 90° steel wire in the tire body 3. After cutting, the ends of the steel wire on both sides are wrapped with the first edge film 56 and the second edge film 57, respectively, and then a layer of upper film 58 is applied on the outside of the second edge film 57. The edge sealing film 59 is used to wrap the end point of the tire body 3 to isolate the tire body 3 and the steel wire bead cloth 53, so that the end point of the tire body 3 tends to the side of the apex 51, and the overall direction is consistent with the direction of the tire body at the same position on the inner side of the tire to avoid stress concentration. The cutting angle of the cord in the first nylon spigot cloth 54, that is, the angle β between the cord and the vertical direction is 45°, which is applied below the steel wire spigot cloth 53, and the two ends cover the end points of the steel wire spigot cloth 53; the cutting angle of the cord in the second nylon spigot cloth 55, that is, the angle between the cord and the vertical direction is 45°, which is applied below the first nylon spigot cloth 54, and the two ends of the second nylon spigot cloth 55 cover the end points of the first nylon spigot cloth 54. Since nylon 66 cord has good heat resistance, high strength, and is not sensitive to moisture, it can effectively play an isolation and protection role. The first nylon spigot cloth 54 and the second nylon spigot cloth 55 are both synthesized with nylon 66 cord.

[0029] The inner diameter of the wire bead 52 of the load-bearing tire of the embodiment of the utility model is set to 574-575mm, ensuring that there is enough space between the wire bead 52 and the composite part, which can avoid the problems of the bead scraping the tire body, the bead opening not being pressed firmly, and the composite part being misaligned during tire molding.

[0030] The load-bearing tire of the utility model embodiment increases the inner diameter of the wire ring 52, arranges the wire ring 52 compactly, and wraps the wire bead cloth 53 around the tire body 3 in a U-shaped application manner. Two layers of nylon bead cloth are attached to the outside of the wire bead cloth 53, which can enhance the rigidity of the tire heel and strengthen the load-bearing performance of the tire.

[0031] The carcass 3 of the load-bearing tire of the utility model embodiment is calendered with ultra-high strength steel cords, the cord density is 60 cords / dm, and the breaking strength of a single steel cord is 2225N. The belt layer 4 is four layers, each belt layer uses ultra-high strength and high ductility steel cords, and the steel cord density is 45 cords / dm-60 cords / dm, and the breaking strength of a single steel cord ranges from 860N to 2800N. The belt layer 4 includes a first belt layer 41, a second belt layer 42, a third belt layer 43 and a fourth belt layer 44 from the inside to the outside. Among them, the breaking strength of a single steel wire of the first belt layer 41 is 1850N, and the density of the steel cord is 48 strands / dm; the breaking strength of a single steel wire of the second belt layer 42 is 2800N, and the density is 45 strands / dm; the breaking strength of a single steel wire of the third belt layer 43 is 2800N, and the density of the steel cord is 45 strands / dm; the fourth belt layer 44 uses high-tensile steel cords, and its single steel wire breaking strength is weak, but the stretchability of the steel cord is higher than that of the steel cords of other belt layers, which effectively weakens the interaction between the steel wire and the rubber, and plays a good role in extension and transition. The breaking strength of a single steel wire of the fourth belt layer 44 is 860N, and the density of the steel cord is 40 strands / dm. Through the above-mentioned structural design of the carcass 3 and the belt layer 4, the load can be effectively dispersed, and the bearing capacity and stability of the crown 1 of the tire can be improved. The ratio of the second belt layer to the tire running surface width is 0.85-0.91, the difference between the first belt layer, the third belt layer and the second belt layer is guaranteed to be within the range of 11-13mm, and the fourth belt layer is guaranteed to have its two end points fall on the pattern blocks to avoid falling in the middle of the pattern grooves. Preferably, the width ratio of the first belt layer, the second belt layer, the third belt layer and the fourth belt layer is 1.9:2.1:1.9:1. The load-resistant tire of the embodiment of the utility model is provided with a four-layer belt layer structure, each belt layer uses ultra-high strength and high ductility steel cord, and the width ratio between each belt layer is reasonably set, so as to improve the overall rigidity of the crown 1, improve the crown mark and the growth curve of the crown 1.

[0032] In order to enhance the tire's ability to resist lateral forces and improve the tire's stability and handling performance when turning and changing directions, the thickness of the rubber at the overlapped part of the sidewall 2 is thickened. The overlap thickness W between the sidewall 2 and the apex 51 is 3-7mm, which is 1-2mm thicker than conventional products. The apex 51 further includes an upper apex 511 and a lower apex 512. In the selection of the apex, a apex with a smaller width and thicker pass is used to make the rubber distribution at the sub-pass more reasonable and the ring material fuller. Under the premise of ensuring the strength of the tire heel, the deformation area of ​​the sidewall is increased to provide better support and handling performance. The tire lining curvature radius is calculated according to the natural balance contour theory, and the calculation formula is ρ=r k 2 -r m2 / 2r, where ρ represents the radius of curvature, r k Indicates the radius of the tire vertex, r m The load-bearing tire of the utility model optimizes the inner contour curve according to the product performance, so that it matches the outer contour shape, generates reasonable deformation during use, and reasonably distributes the stress in the cross section, so as to improve the service life of the tire.

[0033] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A load-bearing tire, characterized in that: The tire comprises a carcass and a tire bead, wherein the tire bead comprises an apex rubber and a wire ring, the carcass is wrapped around the wire ring to the outside of the apex rubber, and the outside of the carcass is covered with a wire bead cloth, a first nylon bead cloth and a second nylon bead cloth in sequence; The first nylon welt cloth and the second nylon welt cloth are staggered and arranged in the circumferential direction, and are both in a cross state with the direction of the steel wire welt cloth cord; One end of the steel wire cloth is covered with a first edging film, and the other end is covered with a second edging film, and the outer side of the second edging film is covered with a layer of upper film, wherein the upper film is located between the carcass and the first nylon cloth, and the thickness of the upper film is greater than the thickness of the second edging film, and the other end of the upper film is higher than the end point of the carcass.

2. The load-resistant tire according to claim 1, characterized in that: The end points of the carcass are covered with edge-sealing film.

3. The load-resistant tire according to claim 1, characterized in that: The cutting angle of the steel cord in the steel wire cloth is 30°, and it is wrapped on the outside of the carcass in a U-shaped application method.

4. The load-resistant tire according to claim 1, characterized in that: The cutting angle of the inner cord of the first nylon cloth is 45 degrees, and it is applied under the steel wire cloth, and both ends of the first nylon cloth cover the two ends of the steel wire cloth; The cutting angle of the inner cord of the second nylon splice cloth is 45 degrees, and the second nylon splice cloth is applied below the first nylon splice cloth, and both ends of the second nylon splice cloth cover the two end points of the first nylon splice cloth.

5. The load-resistant tire according to claim 1, characterized in that: The carcass steel cord density is 60 cords / dm and the breaking strength of a single steel wire is 2225N.

6. The load-resistant tire according to claim 1, characterized in that: It also includes a belt layer, the density of the belt layer steel cord is 45 / dm-60 / dm, and the breaking strength of a single steel wire ranges from 860N to 2800N.

7. The load-resistant tire according to claim 6, characterized in that: The belt layers include, from the inside to the outside, the first belt layer, the second belt layer, the third belt layer and the fourth belt layer, wherein the breaking strength of a single steel wire in the first belt layer is 1850N, and the steel cord density is 48 wires / dm; the breaking strength of a single steel wire in the second belt layer is 2800N, and the steel cord density is 45 wires / dm; the breaking strength of a single steel wire in the third belt layer is 2800N, and the steel cord density is 45 wires / dm; the breaking strength of a single steel wire in the fourth belt layer is 860N, and the steel cord density is 40 wires / dm.

8. The load-resistant tire according to claim 7, characterized in that: The width ratio of the first belt layer, the second belt layer, the third belt layer and the fourth belt layer is 1.9:2.1:1.9:

1.

9. The load-resistant tire according to claim 1, characterized in that: The inner diameter of the wire ring is 574-575mm.

10. The load-resistant tire according to claim 1, characterized in that: It also includes the sidewall, and the overlap thickness between the sidewall and the apex rubber is 3-7mm.

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