A novel all-steel radial tire bead structure

Abstract

This invention proposes a novel all-steel radial tire bead structure, belonging to the field of tire carcass technology. The novel all-steel radial tire bead structure includes a steel bead and a carcass ply. The carcass ply wraps around the bottom of the steel bead from the inside out, forming a reverse-wrapped portion. This reverse-wrapped portion includes a reverse-wrapped end that flips from the tire sidewall towards the inside of the steel bead and extends into the steel bead. The novel all-steel radial tire bead structure provided by this invention, by placing the reverse-wrapped end inside the steel bead, ensures that the end of the carcass ply is outside the deformation zone, preventing damage to the carcass ply caused by continuous tire deformation and significantly improving tire lifespan.

Description

Technical Field

[0001] This utility model belongs to the field of tire carcass technology, and in particular relates to a novel bead structure for all-steel radial tires. Background Technology

[0002] The logistics industry has made an indispensable contribution to the economic progress of today's society, becoming a mainstay of social development. In recent years, the demand for logistics transportation has grown rapidly, and the transportation characteristics are trending towards high speed and heavy load, but there are relatively few specialized tire products on the market for this transportation scenario.

[0003] In traditional all-steel radial tires, the ends of the carcass plies are located in areas of high stress and repeated deformation during operation, which means that tire damage often occurs preferentially at the ends of the carcass plies. When vehicles are subjected to a combination of high-speed driving and heavy-load transportation for extended periods, the ends are more susceptible to the cumulative effect of fatigue damage caused by stress cycles, eventually leading to cracks or even structural fractures in the carcass plies. Utility Model Content

[0004] 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.

[0005] This utility model proposes a novel bead structure for all-steel radial tires, which solves the technical problem that the ends of the tire carcass cord layers are prone to damage. It has the characteristics of improving the tire's load-bearing capacity and high-speed performance, thereby ensuring the safety of tire use and significantly extending the tire's service life.

[0006] This utility model discloses a novel bead structure for an all-steel radial tire, including a steel wire ring and a tire carcass ply. The carcass ply extends from the inside of the steel wire ring outwards, around the bottom of the steel wire ring, and then wraps back upwards to form the reverse-wrapped portion of the carcass ply. The reverse-wrapped portion of the tire carcass includes a reverse-wrapped end, which is flipped from the tire side toward the inside of the steel wire ring and extends into the steel wire ring.

[0007] In some embodiments, the wire coil includes an outer wire coil and an inner wire coil, and the reverse end is located between the outer wire coil and the inner wire coil.

[0008] In some embodiments, the cross-sectional width of the outer steel wire ring gradually decreases radially from the reverse end, forming an approximately trapezoidal structure; the outer steel wire ring and the inner steel wire ring are symmetrically arranged on both sides of the reverse end.

[0009] In some embodiments, the cross-section of the outer wire ring has a rounded transition around its perimeter.

[0010] In some embodiments, the vertical distance between the reverse end of the reverse end and the inner surface of the carcass ply located inside the wire coil is 2-3 mm.

[0011] In some embodiments, an insulating film is provided between the reverse end of the reverse end and the inner surface of the carcass ply located inside the wire coil.

[0012] In some embodiments, the thickness of the insulating film is 2-3 mm and the width is 10-20 mm; the midpoint of the insulating film in the radial direction is on the same straight line as the midpoint of the reverse end in the radial direction.

[0013] In some embodiments, the outer surface of the reverse end is provided with a nylon fabric layer, which extends from the tire side inward around the reverse end point of the reverse end and then towards the tire side; the cross-section of the nylon fabric layer is a horizontally placed U-shape, and the opening faces the tire side direction.

[0014] In some embodiments, the thickness of the nylon fabric layer is 0.8-1.2 mm, and the width is the same as the width of the outer steel wire ring; the nylon cord angle of the nylon fabric layer is 40-55°.

[0015] In some embodiments, the radial distance between the bottom of the outer steel wire ring and the top of the inner steel wire ring is defined as d1, and the sum of the thicknesses of the tire carcass cord and the nylon fabric layers located on both sides of the tire carcass cord is defined as d2, where d2-d1=0.5-1.0mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The novel all-steel radial tire bead structure provided by this invention sets the reverse-wrapped end point inside the steel wire ring, so that the end point of the tire carcass ply is outside the deformation zone, avoiding damage to the tire carcass ply caused by continuous tire deformation, and greatly improving tire service life. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A schematic diagram of the bead structure of a novel all-steel radial tire provided in this embodiment of the present invention; In the above figures: 1. Steel wire ring; 11. Outer steel wire ring; 12. Inner steel wire ring; 2. Carcass ply; 21. Reverse wrap end; 211. Reverse wrap end point; 3. Separating film; 4. Nylon ply. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] like Figure 1 As shown, the bead structure of this novel all-steel radial tire includes a steel wire ring 1 and a carcass ply 2. The steel wire ring 1 is made of multiple single steel wires wound together. The carcass ply 2 wraps around the bottom of the steel wire ring 1 from the inside out and then wraps back up to form a reversed carcass ply portion. The reversed carcass ply portion includes a reversed end 21, which flips from the tire sidewall toward the inside of the steel wire ring 1 and extends into the steel wire ring 1.

[0023] The aforementioned novel all-steel radial tire bead structure, by placing the reverse end point 211 of the carcass ply 2 inside the steel wire ring 1, ensures that the end point of the carcass ply 2 is outside the deformation zone, thus avoiding damage to the carcass ply 2 caused by continuous tire deformation and significantly improving tire service life.

[0024] In some embodiments, the wire coil 1 includes an outer wire coil 11 and an inner wire coil 12, with the reverse end 21 located between the outer wire coil 11 and the inner wire coil 12.

[0025] In some embodiments, the cross-sectional width of the outer wire coil 11 gradually decreases radially from the reverse end 21, forming an approximately trapezoidal structure, and the cross-sectional width of the inner wire coil 12 also gradually decreases radially from the reverse end 21, forming an approximately trapezoidal structure, so that the outer wire coil 11 and the inner wire coil 12 are symmetrically arranged on both sides of the reverse end 21.

[0026] The above structural design, by setting the widest edges of the inner steel wire ring 12 and the outer steel wire ring 11 to contact the reverse end 21 of the tire carcass ply 2, makes the steel wire ring 1 and the reverse end 21 have the largest contact area, thereby improving the stability of the reverse end 211 of the tire carcass ply 2 and further improving the service life of the tire.

[0027] In some embodiments, the cross-section of the outer wire ring 11 is rounded around all four sides, and similarly, the cross-section of the inner wire ring 12 is rounded around all four sides.

[0028] The above structural design, by setting the trapezoidal cross-sections of the outer steel wire ring 11 and the inner steel wire ring 12 with rounded transitions around them, makes each corner more in line with the shape of the tire carcass when it is bent. This can reduce the local stress concentration of the tire carcass during the bending process, thereby helping to improve the durability of the reverse wrapping end point 211 of the tire carcass ply 2.

[0029] In some embodiments, the vertical distance between the reverse end point 211 of the reverse end 21 and the inner surface of the carcass ply 2 located inside the wire ring 1 is 2-3 mm.

[0030] In the above structural design, by setting a gap between the reverse end point 211 of the reverse end 21 and the inner surface of the tire carcass ply 2, it is possible to prevent the reverse end point 211 from puncturing the inner tire carcass ply 2.

[0031] In some embodiments, an insulating film 3 is provided between the reverse end point 211 of the reverse end 21 and the inner surface of the carcass ply 2 located inside the wire ring 1.

[0032] The above structural design, by setting the isolation film 3, can prevent the reverse end point 211 from puncturing the inner carcass ply 2, and can also isolate the inner carcass ply 2 from the steel wire ring 1, thereby preventing the inner carcass ply 2 from directly contacting the steel wire ring 1 and causing wear.

[0033] In some embodiments, the thickness of the isolation film 3 is 2-3 mm and the width is 10-20 mm; the midpoint of the isolation film 3 in the radial direction is on the same straight line as the midpoint of the reverse end 21 in the radial direction.

[0034] In some embodiments, a nylon fabric layer 4 is provided on the outer surface of the reverse end 21. The nylon fabric layer 4 extends from the tire side inward around the reverse end point 211 of the reverse end 21 and then extends towards the tire side. The cross-section of the nylon fabric layer 4 is a horizontally placed U-shape, and the opening faces the tire side.

[0035] The above structural design, by setting the nylon fabric layer 4, can not only prevent the reverse end 211 from puncturing the inner carcass ply layer 2, but also protect the reverse end 21 of the carcass ply layer 2 from being damaged by the steel wire ring 1.

[0036] In some embodiments, the thickness of the nylon fabric layer 4 is 0.8-1.2 mm, and the width is the same as the width of the outer steel wire ring 11; the nylon cord angle of the nylon fabric layer 4 is 40-55°.

[0037] In some embodiments, the radial distance between the bottom of the outer wire ring 11 and the top of the inner wire ring 12 is defined as d1, and the sum of the thicknesses of the carcass cord and the nylon fabric layers 4 located on both sides of the carcass cord is defined as d2, where d2-d1=0.5-1.0mm.

[0038] The above structural design ensures a reasonable interference fit during assembly by setting the radial distance between the bottom of the outer steel wire ring 11 and the top of the inner steel wire ring 12 to be less than the thickness of the tire carcass cord and the nylon fabric layers 4 located on both sides of the tire carcass cord. This facilitates production and assembly and also fixes the reverse wrapping end 21.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A novel all-steel radial tire bead structure, characterized in that, Includes steel wire rings (1) and carcass ply (2); The carcass ply (2) wraps around the bottom of the wire ring (1) from the inside out and then wraps back up to form the carcass ply reverse wrapping part; The reverse-wrapped portion of the tire carcass includes a reverse-wrapped end (21), which is flipped from the tire side toward the inside of the wire ring (1) and extends into the wire ring (1).

2. The novel all-steel radial tire bead structure according to claim 1, characterized in that, The wire coil (1) includes an outer wire coil (11) and an inner wire coil (12), and the reverse end (21) is located between the outer wire coil (11) and the inner wire coil (12).

3. The novel all-steel radial tire bead structure according to claim 2, characterized in that, The cross-sectional width of the outer wire ring (11) gradually decreases radially from the reverse end (21), forming an approximately trapezoidal structure; the outer wire ring (11) and the inner wire ring (12) are symmetrically arranged on both sides of the reverse end (21).

4. The novel all-steel radial tire bead structure according to claim 2, characterized in that, The cross-section of the outer steel wire ring (11) is rounded around all four sides.

5. The novel all-steel radial tire bead structure according to claim 1, characterized in that, The vertical distance between the reverse end point (211) of the reverse end (21) and the inner surface of the carcass ply (2) located inside the wire ring (1) is 2-3 mm.

6. The novel all-steel radial tire bead structure according to claim 5, characterized in that, An insulating film (3) is provided between the reverse end point (211) of the reverse end (21) and the inner surface of the carcass ply (2) located inside the wire ring (1).

7. The novel all-steel radial tire bead structure according to claim 6, characterized in that, The thickness of the isolation film (3) is 2-3 mm and the width is 10-20 mm; the midpoint of the isolation film (3) in the radial direction is on the same straight line as the midpoint of the reverse end (21) in the radial direction.

8. The novel all-steel radial tire bead structure according to claim 3, characterized in that, The outer surface of the reverse end (21) is provided with a nylon fabric layer (4). The nylon fabric layer (4) extends from the tire side inward around the reverse end point (211) of the reverse end (21) and then extends to the tire side. The cross-section of the nylon fabric layer (4) is a horizontally placed U-shape, and the opening faces the tire side.

9. The novel all-steel radial tire bead structure according to claim 8, characterized in that, The thickness of the nylon fabric layer (4) is 0.8-1.2 mm, and the width is the same as the width of the outer steel wire ring (11); the nylon cord angle of the nylon fabric layer (4) is 40-55°.

10. The novel all-steel radial tire bead structure according to claim 9, characterized in that, The radial distance between the bottom of the outer steel wire ring (11) and the top of the inner steel wire ring (12) is defined as d1, and the sum of the thicknesses of the tire carcass cord and the nylon fabric layers (4) located on both sides of the tire carcass cord is defined as d2, where d2-d1=0.5-1.0mm.

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