All-steel radial tire with reinforced tire bead and preparation method of all-steel radial tire

Abstract

The invention discloses an all-steel radial tire using double-layer seam allowance and double-layer welt composite parts to reinforce a tire bead and a preparation method of the all-steel radial tire, a first nylon welt composite part and a second nylon welt composite part are arranged at the inner end point and the outer end point of a steel wire seam allowance reinforcing layer of the tire, and a buffer seam allowance layer and a seam allowance reinforcing layer are additionally arranged at the inner end point of the steel wire seam allowance reinforcing layer; the first nylon welt composite part, the second nylon welt composite part, the buffer seam allowance layer and the seam allowance reinforcing layer are arranged in a misalignment manner; by improving the structure of the nylon auxiliary layer and adopting the misalignment design of the double-layer nylon composite part, the stress concentration of the tire is effectively prevented, the high load resistance strength of the tire bead is enhanced, the durability of the tire bead is improved, the durability of the tire bead under the heavy load condition is improved, the service life of the tire bead under the heavy load condition is prolonged, and the problem that the heavy load tire bead is large in deformation and poor in durability is solved. The problem that cord thread turn-up endpoints of a heavy-duty tire bead part are damaged and the seam allowance part is exploded due to damage of the inner endpoints of the seam allowance is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tire manufacturing, and particularly relates to a full steel radial tire with a double-layer bead toe and a double-layer bead filler composite to reinforce the bead. BACKGROUND

[0002] Full steel radial tires have undergone a long and tortuous development, and now are increasingly developing towards heavy load and high speed. However, during the running of the full steel radial tire, the bead part (toe part) often cracks and deforms under heavy load, and becomes a frequently-occurring part of tire diseases. To improve the performance and service life of the tire, the structure design of the bead part is an important issue at present.

[0003] The bead body cord of the full steel radial tire is arranged radially, the number of layers of the bead body cord in the sidewall is small, the sidewall is thin, and the heat dissipation and comfort are good, but the bead rigidity is insufficient, and the overload use ability is poor. When running at high speed and under overload, the bead at the rim position deforms greatly, and becomes the main part of the tire components that are damaged first. Therefore, the rigidity of the bead part needs to be increased, and the deformation needs to be reduced, and the stress concentration and heat damage caused by the increase of the rigidity also need to be considered. With the development of China's economy, the logistics and transportation industry is rising, and various industries are developing towards specialization; in the development of long-distance or super-long-distance heavy-load vehicles, full load and standard load are used, and in short-distance or mine areas, heavy load is required under a certain speed, which puts forward new requirements for the load-bearing capacity of the tire and the economic feasibility of the production and manufacture of complex structure products.

[0004] The existing full steel radial steel wire cover structure mainly adopts a single-layer bead toe reinforcing layer under standard load, and a single-layer bead toe reinforcing layer + single-layer nylon under slight overload and full load, which causes stress concentration at the outside reverse wrapping end point of the steel cord. On the one hand, stress concentration occurs at the reverse wrapping end point, which causes the end point part to crack outward; on the other hand, the bead toe and the sidewall stiffness on the outside of the cord end point are insufficient, and cannot disperse the end point stress well, which is easy to cause stress concentration and excessive heat generation, thereby causing damage to the cord or the bead toe end point, and the bead toe part needs to be further improved. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a full steel radial tire with a double-layer bead toe and a double-layer bead filler composite to reinforce the bead, and a preparation method thereof, which can solve the problems of large deformation of the heavy load bead, damage to the cord reverse wrapping end point of the bead part, and damage to the bead toe end point, which causes the bead toe part to burst.

[0006] To solve the above problems, the technical scheme provided by the present application is as follows:

[0007] The application provides a full-steel radial tire with a double-layer bead toe and a double-layer bead filler to reinforce a bead, comprising an inner liner (7), a first nylon bead filler (1) and a second nylon bead filler (2) arranged on the inner side of the inner liner (7), a cushion bead toe layer (3) and a bead toe reinforcing layer (4) arranged on the inner side of the second nylon bead filler (2), the cushion bead toe layer (3) being arranged on the outer side of the bead toe reinforcing layer (4), and a cord (5) arranged on the inner side of the bead toe reinforcing layer (4); the first nylon bead filler (1), the second nylon bead filler (2), the cushion bead toe layer (3) and the bead toe reinforcing layer (4) are arranged with staggered edges.

[0008] In an optional embodiment of the application, the first nylon bead filler (1) and the second nylon bead filler (2) have the same cutting angle, the angle is between 46° and 76°, the bead filler of the first nylon bead filler (1) and the second nylon bead filler (2) is U-shaped at the bead position, and the widths of the two layers of bead fillers are the same; the end point (a) and the end point (j) of the first nylon bead filler (1) and the end point (b) and the end point (j) of the second nylon bead filler (2) are staggered by 10mm-25mm, the sticking directions are the same, and the lengths are staggered by 15-30mm.

[0009] In an optional embodiment of the application, the cushion bead toe layer (3) is arranged on the outer side of the bead toe reinforcing layer (4), the difference between the lap amount (e) of the cushion bead toe layer (3) and the lap amount (d) of the bead toe reinforcing layer (4) is-5mm-20mm, the bead toe angles of the cushion bead toe layer (3) and the bead toe reinforcing layer (4) are 25°-35°, and the sticking directions are the same.

[0010] In an optional embodiment of the application, the sticking directions of the first nylon bead filler (1) and the second nylon bead filler (2) are opposite to the sticking direction of the bead toe reinforcing layer (4).

[0011] In an optional embodiment of the application, the outer end point h of the bead toe reinforcing layer (4) is higher than the end point (f) of the cord (5), there is a buffer heat extrusion isolation type glue (6) between the two end points, and the difference between the two end points is 8mm-25mm.

[0012] In an optional embodiment of the application, the bead toe reinforcing layer (4) is internally provided with a steel wire (8), and the bead toe reinforcing layer (4) is provided with a covering glue (9) at the two side end portions.

[0013] In an optional embodiment of the present application, the lower end point (e) of the buffer bead layer (3) and the inner end point (d) of the bead reinforcement layer (4) are below the reference line of the reverse-wrapped end point (f) of the cord (5), and the upper end point (c) of the buffer bead layer (3) is between or above the reverse-wrapped end point (f) of the cord (5) and the outer end point (h) of the bead reinforcement layer (4).

[0014] In an optional embodiment of the present application, the difference between the reference line of the reverse-wrapped end point h of the buffer bead layer (3) is 10-25 mm, the difference between the inner end point d of the bead reinforcement layer (4) and the reference line is 10-20 mm, and the difference between the upper height c of the buffer bead layer (3) and the reference line is 20-35 mm.

[0015] The present application provides a preparation method of a full-steel radial tire with a double-layer bead and a double-layer bead reinforcement composite, comprising the following steps:

[0016] Step 1, preparing a first nylon bead reinforcement composite (1) and a second nylon bead reinforcement composite (2) in advance: a nylon cord is obliquely cut at an angle of 46°-76° by an oblique cutting machine; the width is determined according to different specifications, and the length is calculated according to the angle and the diameter of the fitting drum; the double-layer bead reinforcement is equal in width to facilitate construction, and the width and length are staggered by 10-25 mm and 15-30 mm, respectively;

[0017] Step 2, preparing a bead reinforcement layer (4) in advance: a steel cord is obliquely cut at an angle of 25°-35° by an oblique cutting machine; the bead reinforcement layer is wrapped with two pieces of edge wrapping rubber sheets, respectively; after wrapping, the bead reinforcement layer is extruded into an integrated body by a hot extruder and is coiled;

[0018] Step 3, preparing a buffer bead layer (3) in advance: a steel cord is obliquely cut at an angle of 25°-35° by an oblique cutting machine; the bead reinforcement layer is wrapped with two pieces of edge wrapping rubber sheets, respectively;

[0019] Step 4, after the inner liner (7) and the sidewall are fitted, the first nylon bead reinforcement composite (1) and the second nylon bead reinforcement composite (2) are arranged at the fitting lap position of the sidewall and the inner liner, and the nylon angle of the nylon wrapping cloth of the two nylon composites is in the shape of an "eight";

[0020] Step 5, after the first nylon bead reinforcement composite (1) and the second nylon bead reinforcement composite (2), the buffer bead layer (3) is first fitted at the inner end point of the second nylon bead reinforcement composite (2), and then the bead reinforcement layer (4) is fitted;

[0021] Step 6, the sidewall cord (5) is symmetrically fitted, the outer end point (h) of the bead reinforcement layer (4) is higher than the end point (f) of the cord (5), the buffer hot extrusion isolation rubber (6) is arranged between the two end points, and then the fixing and forming are performed.

[0022] Step 7, after molding, the tire blank is vulcanized and inspected, packaged.

[0023] In an optional embodiment of the present application, the first nylon bead filler composite (1) and the second nylon bead filler composite (2) are used as auxiliary reinforcing layers, the buffer bead toe layer (3) and the bead toe reinforcing layer (4) improve the bead stiffness and gradually disperse the stress of the bead cord end points, so as to improve the load capacity of the tire.

[0024] In an optional embodiment of the present application, the level difference of the buffer bead toe layer (3) to the reference line of the reverse wrapped end point h is 10-25 mm, the level difference of the bead toe reinforcing layer (4) to the reference line of the inner end point d is 10-20 mm, and the level difference of the height c of the buffer bead toe layer (3) to the reference line is 20-35 mm.

[0025] The present application provides a preparation method of a full steel radial tire with a double-layer bead toe and a double-layer bead filler composite to reinforce the bead, including the following steps:

[0026] Step 1, the first nylon bead filler composite (1) and the second nylon bead filler composite (2) are prepared in advance: the nylon cord is obliquely cut by an oblique cutting machine at an angle of 46°-76°; the width is determined according to different specifications, and the length is calculated according to the angle and the diameter of the matching drum; the double-layer bead filler has the same width for convenient construction, and the width and length are staggered by 10-25 mm and 15-30 mm, respectively;

[0027] Step 2, the bead toe reinforcing layer (4) is prepared in advance: the steel cord is obliquely cut by an oblique cutting machine at an angle of 25°-35°; the bead toe reinforcing layer edge coating film is divided into two parts, and is wrapped on the two sides of the bead toe reinforcing layer, respectively; after the wrapping, the bead toe reinforcing layer isolation glue is extruded into an integrated body by a hot extruder and is coiled;

[0028] Step 3, the buffer bead toe layer (3) is prepared in advance: the steel cord is obliquely cut by an oblique cutting machine at an angle of 25°-35°; the bead toe reinforcing layer edge coating film is divided into two parts, and is wrapped on the two sides of the bead toe reinforcing layer, respectively;

[0029] Step 4, after the inner liner (7) and the sidewall are attached, the first nylon bead filler composite (1) and the second nylon bead filler composite (2) are arranged at the attachment overlap position of the sidewall and the inner liner, and the nylon angle of the nylon wrapping of the two nylon composites is in the shape of an "eight";

[0030] Step 5, after the first nylon bead filler composite (1) and the second nylon bead filler composite (2), the buffer bead toe layer (3) is attached to the inner end point of the second nylon bead filler composite (2) first, and then the bead toe reinforcing layer (4) is attached;

[0031] Step 6, the tire body cord (5) is symmetrically attached again, the outer end point (h) of the sub-port reinforcing layer (4) is higher than the end point (f) of the cord (5), the two end points are buffered by the heat extrusion isolation type glue (6), and then fixed forming is carried out;

[0032] Step 7, after forming, the tire blank is vulcanized and inspected and packaged.

[0033] In an optional embodiment of the present application, the first nylon bead strip composite (1) and the second nylon bead strip composite (2) are used for auxiliary reinforcing layers, the buffer sub-port layer (3) and the sub-port reinforcing layer (4) improve the stiffness of the bead, and the end point stress of the bead cord is dispersed step by step to improve the load bearing capacity of the tire.

[0034] Compared with the prior art, the embodiment of the present application provides a full steel radial tire with a double-layer sub-port and a double-layer bead strip composite for reinforcing the bead and a preparation method thereof, and has the following beneficial effects:

[0035] (1) The present application adopts a double-layer nylon bead strip and a double-layer sub-port reinforcing layer structure; through improvement of the structure of the nylon auxiliary layer, a double-layer nylon composite with staggered edges is designed, stress concentration is effectively prevented, high load strength of the bead is enhanced, durability of the bead is improved, and durability and service life of the tire bead under heavy load conditions are improved. The cord reverse wrapping end point is lower than the sub-port reverse wrapping end point, an isolation buffer glue is added between the two end points to disperse the end point stress of the cord, the U-shaped sub-port high reverse wrapping disperses the end point stress of the cord, and the U-shaped double-layer nylon bead strip disperses the toe port end point stress again, so that the stress is released step by step to solve the problem of damage to the outer end of the cord end point.

[0036] (2) After solving the problem of stress concentration and damage of the cord end point, the stress concentration of the inner end point of the sub-port becomes the main problem, in order to further realize a qualitative breakthrough in the performance of the bead structure, the present application moves the easily damaged inner end point of the sub-port downward to the position of the rim that is less deformed, in order to ensure the overall rigidity of the bead, disperse the stress of the position with large deformation, increase the sub-port buffer layer, increase the deformation interval, and avoid stress concentration by not designing the skeleton end point in the deformation interval.

[0037] (3) The inner and outer stresses at the upper end position of the bead are gradually dispersed, the lower end of the bead adopts U-shaped sub-port wrapping and nylon reinforced toe port, the rigidity of the bead is increased, the deformation of the bead is reduced, and the heat generation of the bead is reduced.

[0038] (4), the novel bead structure provided by the application reduces the stress of the bead part, provides a full steel radial tire heavy load bead structure with more reasonable bead rigidity matching, stronger bead carrying capacity and better material gradient distribution, solves the problem that the end point of the carcass ply reverse wrapping is the largest stress concentration point, simultaneously avoids the generation of other stress concentration points, uniformly disperses the stress of the bead position, simultaneously starts from the rigidity matching of the whole tire, increases the bead rigidity, disperses the deformation of the tire to the position with the largest cross section width of the tire side, makes the deformation of the bead position smaller, thereby reduces the stress concentration of the region, reduces the rubber hysteresis heat generation, and further greatly improves the carrying capacity of the bead part of the full steel radial tire, the application has better use effect and stable quality under the conditions of super heavy load and high pressure, improves the bead durability of the tire and the service life under the condition of super heavy load, and has very high practical application value. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0040] Figure 1 A cross-sectional structure schematic diagram of a full steel radial tire with a bead reinforced by a double-layer sub-port and a double-layer wale composite is provided for the embodiments of the application.

[0041] Figure 2 An end point schematic diagram of a full steel radial tire with a bead reinforced by a double-layer sub-port and a double-layer wale composite is provided for the embodiments of the application.

[0042] Figure 3 A structure schematic diagram of a first nylon wale composite and a second nylon wale composite is provided for the embodiments of the application.

[0043] Figure 4 A structure schematic diagram of a sub-port reinforcing layer is provided for the embodiments of the application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. The "upper", "lower", "front", "rear", "left", "right" and the like used in the mounting position or direction of the structure or parts of the embodiments are based on the orientation of the drawings given, which are only for the convenience of description and distinguishing the relative positions of the parts or directions, and do not represent the orientation of the device or functional parts when used.

[0045] As shown in Figure 1 , Figure 2 and Figure 3 , the present embodiment provides a full steel radial tire with double-layer sub-bead and double-layer bead filler composite to strengthen the bead, which comprises an inner liner 7, a first nylon bead filler composite 1 and a second nylon bead filler composite 2 are arranged on the inner side of the inner liner 7, a buffer sub-bead layer 3 and a sub-bead reinforcing layer 4 are added on the inner side of the second nylon bead filler composite 2, the buffer sub-bead layer 3 is on the outer side of the sub-bead reinforcing layer 4, and a cord 5 is arranged on the inner side of the sub-bead reinforcing layer 4. The first nylon bead filler composite 1, the second nylon bead filler composite 2, the buffer sub-bead layer 3 and the sub-bead reinforcing layer 4 are arranged with staggered edges. The present application improves the structure of the nylon auxiliary layer, adopts the design of double-layer nylon composite with staggered edges, improves the effective prevention of stress concentration of the tire, enhances the high load strength of the bead, improves the durability of the bead, improves the durability and service life of the tire bead under heavy load conditions, solves the problem of large deformation of the heavy load bead, solves the problem of damage to the cord reverse wrapping end point of the heavy load bead, and solves the problem of sub-bead position explosion caused by damage to the sub-bead inner end point. The full steel radial tire of the present embodiment further comprises a crown type rubber, a belt layer, a sidewall, an inner liner, a nylon bead filler and a composite bead; the composite bead comprises a steel bead, a triangular soft rubber and a hard rubber. The steel sub-bead reinforcing layer of the present embodiment overlaps with the buffer sub-bead layer 3 and the sub-bead reinforcing layer 4, the first nylon bead filler composite and the second nylon bead filler composite are arranged at the inner and outer ends of the steel sub-bead reinforcing layer, and the buffer sub-bead layer and the sub-bead reinforcing layer are added at the inner end of the steel sub-bead reinforcing layer. Figure 1 The first nylon bead filler composite 1 and the second nylon bead filler composite 2 have the same angle, the same width and the same arrangement direction. The buffer sub-bead layer 3 and the sub-bead reinforcing layer 4 are overlapped and constructed, which not only maintains the rigidity of the single-layer sub-bead wrapping, but also ensures the original rigidity, solves the stress concentration at the end point, and uses the isolation rubber 6 between the sub-bead reinforcing layer 4 and the reverse wrapping end point of the cord 5 to better buffer the stress at the end point.

[0046] The first nylon bead filler composite 1 and the second nylon bead filler composite 2 have the same angle, the same width and the same arrangement direction. The buffer sub-bead layer 3 and the sub-bead reinforcing layer 4 are overlapped and constructed, which not only maintains the rigidity of the single-layer sub-bead wrapping, but also ensures the original rigidity, solves the stress concentration at the end point, and uses the isolation rubber 6 between the sub-bead reinforcing layer 4 and the reverse wrapping end point of the cord 5 to better buffer the stress at the end point.

[0047] The first nylon bead strip composite 1 and the second nylon bead strip composite 2 have the same cutting angle θ, the angle is between 46° and 76°, the first nylon bead strip composite 1 and the second nylon bead strip composite 2 are both U-shaped bead strips at the bead position, the two layers of bead strips have the same width; the end point a and the end point j of the first nylon bead strip composite 1 are offset from the end point b and the end point j of the second nylon bead strip composite 2 by 10 mm to 25 mm, the direction of the same, and the length offset is 15 mm to 30 mm.

[0048] The buffer bead ring layer 3 is outside the bead ring reinforcing layer 4, and the difference between the overlap amount e of the buffer bead ring layer 3 and the overlap amount d of the bead ring reinforcing layer 4 is between -5 mm and 20 mm; the bead ring angle of the buffer bead ring layer 3 at the bead ring reinforcing layer 4 is between 25° and 35°, and the direction of the same; the direction of the first nylon bead strip composite 1, the second nylon bead strip composite 2 and the direction of the bead ring reinforcing layer 4 are opposite.

[0049] As shown in Figure 1 and Figure 4 , the outer end point h of the bead ring reinforcing layer 4 is higher than the end point f of the cord 5, there is a buffer heat-extruded isolation type glue 6 between the two end points, and the difference between the two end points is 8 mm to 25 mm. The bead ring reinforcing layer 4 is provided with a steel wire 8, and the two side end portions of the bead ring reinforcing layer 4 are provided with a hemming glue 9.

[0050] The lower end point e of the buffer bead ring layer 3 and the inner end point d of the bead ring reinforcing layer 4 are below the reference line of the reverse wrapping end point f of the cord 5, and the upper end point c of the buffer bead ring layer 3 is between the reverse wrapping end point f of the cord 5 and the outer end point h of the bead ring reinforcing layer 4 or above the outer end point h. The difference between the reference line of the reverse wrapping end point h of the buffer bead ring layer 3 is 10 mm to 25 mm, the difference between the inner end point d of the bead ring reinforcing layer 4 to the reference line is 10 mm to 20 mm. The difference between the upper height c of the buffer bead ring layer 3 to the reference line is 20 mm to 35 mm.

[0051] The embodiment of the application provides a preparation method of a full steel radial tire for reinforcing a bead by using a double-layer bead ring and a double-layer bead strip composite, comprising the following steps:

[0052] Step 1, the first nylon bead strip composite 1 and the second nylon bead strip composite 2 are prepared in advance: the nylon cord is obliquely cut by an angle of 46° to 76° by an angle cutting machine; the width is determined according to different specifications, the length is calculated according to the angle and the diameter of the lamination drum; the double-layer bead strip has the same width, which is convenient for construction, the width offset is 10 mm to 25 mm, and the length offset is 15 mm to 30 mm;

[0053] Step 2, the bead ring reinforcing layer 4 is prepared in advance: the steel cord is obliquely cut by an angle of 25° to 35° by an angle cutting machine; the bead ring reinforcing layer hemming glue sheet is divided into two parts, and is wrapped on the two sides of the bead ring reinforcing layer respectively; after the hemming, the isolation glue of the bead ring reinforcing layer is extruded into an integrated body by a heat-extruding machine and is wound;

[0054] Step 3, pre-prepared buffer sub-port layer 3: slant cutting machine with 25°-35° angle slant cutting steel wire cord; the sub-port reinforcing layer edge adhesive sheet is divided into two, and is respectively wrapped on the two sides of the sub-port reinforcing layer;

[0055] Step 4, after the inner liner 7 and the sidewall are attached, the first nylon edge strip composite 1 and the second nylon edge strip composite 2 are arranged at the joint position of the sidewall and the inner liner, and the nylon angle of the nylon wrapping cloth of the two nylon composites is in the shape of an "eight";

[0056] Step 5, after the first nylon edge strip composite 1 and the second nylon edge strip composite 2, the inner end point of the second nylon edge strip composite 2 is first attached with the buffer sub-port layer 3, and then attached with the sub-port reinforcing layer 4;

[0057] Step 6, the tire body cord 5 is symmetrically attached again, the outer end point h of the sub-port reinforcing layer 4 is higher than the end point f of the cord 5, and the buffer heat extrusion isolation type glue 6 is arranged between the two end points, and then fixed and formed;

[0058] Step 7, after forming, the tire blank is vulcanized and inspected and packaged.

[0059] The first nylon edge strip composite 1 and the second nylon edge strip composite 2 are used for auxiliary reinforcing layer, the buffer sub-port layer 3 and the sub-port reinforcing layer 4 improve the bead stiffness, gradually disperse the stress of the bead cord end point, and achieve the purpose of improving the load bearing capacity of the tire.

[0060] The application improves the structure of the nylon auxiliary layer, adopts the design of double-layer nylon composite with staggered edges, effectively prevents stress concentration, enhances the high load strength of the bead, improves the durability of the bead, reduces the defects of the sub-port part, reduces the safety hidden danger of the tire in the aspects of super heavy load and harsh conditions, improves the performance-price ratio of the tire, and the scheme is economic and feasible.

[0061] The application upgrades and improves the structure of the bead, and after product trial and bead durability experiment, compared with the experimental data of the normal tire, the technology effectively improves the durability of the bead, enhances the rigid transition between the tire body and the sidewall, and effectively reduces stress concentration. The technical scheme of the application is feasible, the cost of implementation is not high in the process, the operability is strong, and the practicality is strong.

[0062] Taking 12.00R20 as an example, the heavy load bead structure of the application is implemented, the bead durability test is carried out on a 1.7-meter drum, and table 1 is the test data of the bead durability.

[0063]

[0064] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and such changes and improvements fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A whole steel radial tire in which the bead is reinforced with a double-layer bead filler and a double-layer chafer, characterized in that, The inner lining layer (7) is provided with a first nylon bead composite (1) and a second nylon bead composite (2) on the inner side, the second nylon bead composite (2) is additionally provided with a buffer sub-port layer (3) and a sub-port reinforcing layer (4) on the inner side, the buffer sub-port layer (3) is outside the sub-port reinforcing layer (4), and the sub-port reinforcing layer (4) is provided with a curtain (5) on the inner side; the first nylon bead composite (1), the second nylon bead composite (2), the buffer sub-port layer (3) and the sub-port reinforcing layer (4) are provided with a staggered edge.

2. A whole steel radial tire reinforced with a composite of a double layer bead apex and a double layer chafer according to claim 1, characterized in that, The first nylon bead composite (1) and the second nylon bead composite (2) have the same cutting angle, the angle is between 46° and 76°, the first nylon bead composite (1) and the second nylon bead composite (2) are U-shaped in the bead position, the widths of the two layers of beads are the same; the end points (a) and (j) of the first nylon bead composite (1) and the end points (b) and (j) of the second nylon bead composite (2) are staggered by 10-25mm, the same direction is adhered, and the length is staggered by 15-30mm.

3. A whole steel radial tire reinforced with a composite of a double layer bead apex and a double layer chafer according to claim 1, characterized in that, The buffer sub-port layer (3) is outside the sub-port reinforcing layer (4), and the difference between the overlap amount (e) of the buffer sub-port layer (3) and the overlap amount (d) of the sub-port reinforcing layer (4) is between -5mm and 20mm; the sub-port angle of the buffer sub-port layer (3) on the sub-port reinforcing layer (4) is 25°-35°, and the same direction is adhered.

4. A whole steel radial tire reinforced with a composite of a double layer bead apex and a double layer chafer according to claim 1, characterized in that, The adhering direction of the first nylon bead composite (1) and the second nylon bead composite (2) is opposite to the adhering direction of the sub-port reinforcing layer (4).

5. A whole steel radial tire reinforced with a composite of a double layer bead apex and a double layer chafer according to claim 1, characterized in that, The outer end point h of the sub-port reinforcing layer (4) is higher than the end point (f) of the curtain (5), there is a buffer heat-extrusion isolation type glue (6) between the two end points, and the difference between the two end points is 8mm-25mm.

6. A whole steel radial tyre reinforced with a composite of double-layer beads and double-layer flanks according to claim 5, characterized in that, The sub-port reinforcing layer (4) is provided with a steel wire (8) inside, and the sub-port reinforcing layer (4) is provided with a covering glue (9) on both sides of the end portion.

7. A whole steel radial tire reinforced with a composite of a double layer bead apex and a double layer chafer according to claim 1, characterized in that, The lower end point (e) of the buffer sub-port layer (3) and the inner end point (d) of the sub-port reinforcing layer (4) are below the reference line of the reverse wrapping end point (f) of the curtain (5), and the upper end point (c) of the buffer sub-port layer (3) is between the reverse wrapping end point (f) of the curtain (5) and the outer end point (h) of the sub-port reinforcing layer (4) or above the outer end point (h).

8. A whole steel radial tire reinforced with a composite of a double layer bead apex and a double layer chafer according to claim 1, characterized in that, The difference between the reference line of the reverse wrapping end point h of the buffer sub-port layer (3) and the reference line is 10-25mm, the difference between the inner end point d of the sub-port reinforcing layer (4) and the reference line is 10-20mm, and the difference between the upper height c of the buffer sub-port layer (3) and the reference line is 20-35mm.

9. A process for producing a full steel radial tire reinforced with a double-layer bead and a double-layer chafer assembly, characterized in that, The steps include: Step 1, the first nylon bead composite (1) and the second nylon bead composite (2) are prepared in advance: the nylon curtain is obliquely cut by an angle of 46°-76° on an oblique cutting machine; the width is determined according to different specifications, and the length is calculated according to the angle and the diameter of the adhering drum; the two layers of beads have the same width for convenient construction, the width is staggered by 10-25mm, and the length is staggered by 15-30mm; Step 2, pre-preparation of the sub-port reinforcing layer (4): the beveling machine bevels the steel cord at an angle of 25-35°; the sub-port reinforcing layer edge adhesive sheet is divided into two, and each is wrapped around the two edges of the sub-port reinforcing layer; after wrapping, the sub-port reinforcing layer isolation adhesive is extruded into an integrated body by a hot extruder and is coiled; Step 3, pre-preparation of the buffer sub-port layer (3): the beveling machine bevels the steel cord at an angle of 25-35°; the sub-port reinforcing layer edge adhesive sheet is divided into two, and each is wrapped around the two edges of the sub-port reinforcing layer; Step 4, after the inner liner (7) and the sidewall are attached, the first nylon strip composite (1) and the second nylon strip composite (2) are arranged at the joint position of the sidewall and the inner liner, and the nylon angle of the nylon cloth of the two nylon composites is in the shape of an "eight"; Step 5, after the first nylon strip composite (1) and the second nylon strip composite (2), the buffer sub-port layer (3) is attached at the inner end point of the second nylon strip composite (2), and then the sub-port reinforcing layer (4) is attached; Step 6, the carcass cord (5) is symmetrically attached again, the outer end point (h) of the sub-port reinforcing layer (4) is higher than the end point (f) of the cord (5), the buffer hot extrusion isolation adhesive (6) is arranged between the two end points, and then the tire blank is fixed and formed; Step 7, after the forming, the tire blank is vulcanized and inspected, packaged.

10. A process for producing a full steel radial tire reinforced with a composite of a double-layer bead apex and a double-layer chafer according to claim 9, characterized in that, The first nylon strip composite (1) and the second nylon strip composite (2) are used for auxiliary reinforcement, the buffer sub-port layer (3) and the sub-port reinforcing layer (4) improve the stiffness of the bead, gradually disperse the stress of the end point of the bead cord, and achieve the purpose of improving the load capacity of the tire.

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