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CN-122008738-A - High-strength low-heat-generation tire bead and preparation method thereof

CN122008738ACN 122008738 ACN122008738 ACN 122008738ACN-122008738-A

Abstract

The invention relates to a high-strength low-heat-generation tire bead and a preparation method thereof, and relates to the field of automobile tires. According to the technical scheme, through layered collaborative design, the comprehensive performance of the tire bead is remarkably improved, the running stress is effectively dispersed through a stepped reinforcing and continuous hardness gradient structure, local stress concentration is avoided, the strength and deformation resistance of the tire bead are greatly improved, and the high torque and heavy load requirements of a new energy electric car are met. And the layout of a plurality of groups of functional adhesive layers not only realizes interlayer smooth transition and gap filling, but also reduces friction heat generation and heat accumulation from the source through the characteristics of low heat generation materials and isolation protection design, and solves the contradiction between strong reinforcement and heat dissipation. In addition, the inner nylon layer and the outer nylon layer are cooperatively reinforced and rigidly supported by the apex, so that the stability of the tire bead structure is enhanced, and the failure risks such as shoulder void and seam allowance cracking are reduced. The whole scheme gives consideration to high strength, low heat generation and long service life, is suitable for multi-scene long-distance use of the fuel vehicle and the new energy electric vehicle, and has good practical value and popularization prospect.

Inventors

  • LU JIONG
  • WANG BAOPENG
  • CHEN XIHE

Assignees

  • 江苏通用科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260122

Claims (7)

  1. 1. The tire bead of the high-strength low-heat-generation tire is characterized by comprising an airtight layer (1A), a transition layer (1B), an inner nylon layer (3), a steel wire bead (4), a tire body (5), an outer nylon layer (9) and a tire wall wear-resistant adhesive layer (11) which are sequentially arranged from inside to outside; A medium-hardness buffer adhesive layer (2) is further arranged between the inner nylon layer (3) and the transition layer (1B), and is used for enabling the transition layer (1B), the medium-hardness buffer adhesive layer (2) and the inner nylon layer (3) to form a soft, hard and harder stepped reinforcing structure; A triangular glue layer (6) is further arranged at the radial outer side gap between the tire body (5) and the steel wire seam allowance (4) and used for filling a gap between the tire body and the steel wire seam allowance, so that the structural stability of the high-strength low-heat-generation tire bead is improved; a high-strength low-heat-generation rubber layer (8) is further arranged between the tire body (5) and the outer nylon layer (9) and used for isolating a tire body turnup end point (7) and enabling the tire body turnup end point (7) to be positioned in the center of an end point radial line H so as to inhibit deformation of the tire body turnup end point (7) and reduce the heat generation level of the tire bead of the high-strength low-heat-generation tire; The low-heat-generation rubber layer (10) is further arranged between the outer nylon layer (9) and the tire side wear-resistant rubber layer (11), and is used for forming a hard, soft and hard buffering and damping structure between the outer nylon layer (9) and the tire side wear-resistant rubber layer (11) so as to reduce high heat generation caused by hard contact of the outer nylon layer and the tire side wear-resistant rubber layer.
  2. 2. The high-strength low-heat-generation tire bead according to claim 1, wherein the inner nylon layer (3) has a double-layer structure, and the height of the inner nylon layer (3) exceeds the wire bead (4) for suppressing deformation of the wire bead (4), thereby improving the strength of the high-strength low-heat-generation tire bead and reducing heat generation.
  3. 3. A high-strength low-heat-generation tire bead according to claim 2, characterized in that the inner nylon layer (3) of the double-layer structure is arranged in parallel in the radial direction of the high-strength low-heat-generation tire bead, and the height of the inner nylon layer far from the transition layer (1B) is higher than the height of the outer nylon layer near the transition layer (1B), and the height difference between the inner nylon layer and the outer nylon layer is 15mm.
  4. 4. The high-strength low-heat-generation tire bead according to claim 1, wherein the hardness of the inner liner (1A), the transition layer (1B), the inner nylon layer (3), the wire bead (4), and the carcass (5) is in a sequentially increasing trend, forming a continuous reinforcing gradient to promote the impact resistance and deformation resistance of the high-strength low-heat-generation tire bead.
  5. 5. A high strength low heat generating tyre bead as claimed in claim 1, characterized in that said high strength low heat generating glue layer (8) completely covers the radially projected area of said carcass turnup end (7) to ensure that said carcass turnup end (7) is not in direct contact with said outer nylon layer (9).
  6. 6. A high strength low heat generation tyre bead according to claim 1, wherein said transition layer (1B) is adapted to achieve a smooth transition of said inner liner (1A) with said medium hardness cushion gum layer (2).
  7. 7. A method for preparing a high-strength low-heat-generation tire bead, the method being applied to the high-strength low-heat-generation tire bead as claimed in any one of claims 1 to 6, the method comprising: s1, uniformly and uniformly attaching an airtight layer (1A) on the surface of an attaching drum, wherein the attaching pressure is controlled to be matched with the speed in the attaching process, so that the airtight layer (1A) is ensured to be completely attached to the surface of the drum; S2, attaching a transition layer (1B) to the outer side of the air-tight layer (1A), wherein the transition layer (1B) is made of rubber material with gradual hardness, the coverage area is required to be ensured to be complete during attaching, the transition smoothness of a subsequent rubber layer is ensured, and stress concentration at an interlayer interface is avoided; S3, arranging a middle-hardness buffer adhesive layer (2) on the outer side of the transition layer (1B), attaching a double-layer parallel-arranged inner nylon layer (3) on the outer side of the middle-hardness buffer adhesive layer (2), controlling the height difference of the inner nylon layer and the outer nylon layer to be 15mm, and pre-stretching the inner nylon layer (3) before attaching to eliminate internal stress; S4, after the steel wire seam allowance (4) is arranged on the outer side of the inner nylon layer (3), the heights of two layers of nylon of the inner nylon layer (3) exceed the steel wire seam allowance (4), and after the steel wire seam allowance (4) is arranged, the coaxiality of the steel wire seam allowance is calibrated through a positioning tool, so that the steel wire seam allowance is ensured to coincide with the central axis of the laminating drum; S5, attaching the tire body (5) according to a preset track and finishing the turn-up operation, controlling the turn-up height of the tire body (5) to enable a tire body turn-up end point (7) to be located at the center of an end point radial line H, injecting a triangular glue layer (6) at a gap between the steel wire seam allowance (4) and the radial outer side of the tire body (5) in a high-pressure filling mode, and slowly pushing in the filling process to discharge air in the gap so as to ensure that the gap is fully filled; S6, sequentially attaching a high-strength low-heat-generation adhesive layer (8), an outer nylon layer (9), a low-heat-generation adhesive layer (10) and a sidewall wear-resistant adhesive layer (11), so as to ensure that the high-strength low-heat-generation adhesive layer (8) completely covers a radial projection area of the carcass turn-up end point (7) to ensure that the carcass turn-up end point (7) is not in direct contact with the outer nylon layer (9); And S7, after all layers are attached, transferring the formed tire bead and the drum body to a subsequent process, and integrally forming, vulcanizing at a high temperature, cooling and shaping the tire bead to complete the integral production of the tire bead.

Description

High-strength low-heat-generation tire bead and preparation method thereof Technical Field The invention relates to the technical field of automobile tires, in particular to a tire bead of a high-strength low-heat-generation tire and a preparation method thereof. Background Based on the actual demands of markets in different areas, part of vehicles need to have reliable loading performance and long-distance transportation capability at the same time, and new energy electric vehicles are typical representatives. The vehicle type has the characteristics of quick starting and accelerating and large output torque, and has higher supporting requirement on the structural strength of the tire bead part. Meanwhile, the road conditions at home and abroad are continuously improved, and the heat radiation performance requirement on the tire bead part is further improved. The design of the tire bead part has some contradictions that if the strength of the tire bead part is simply strengthened, the stress is easy to move upwards to cause the tire shoulder void defect, and if the strength of the tire bead part is weaker, the cavitation erosion cracking phenomenon of the tire bead part is easy to occur. Thus, such application scenarios create a serious challenge for tire design, and tires for this need are also defined as low heat generation load bearing tires. At present, referring to fig. 1, a tire bead structure commonly adopted by domestic tire enterprises is that an inner liner 1A, a transition layer 1B, a steel wire seam allowance 4, a tire body 5 and a tire side wear-resistant adhesive layer 11 are sequentially arranged from inside to outside, a triangular adhesive layer 6 is further arranged at a radial outer side gap between the tire body 5 and the steel wire seam allowance 4, and a tire body turn-up end point 7 is usually positioned at the outer third of an end point radial line H. However, the application scene has complex working conditions and the special characteristics of the new energy electric car, and the prior art scheme cannot meet the upgrading requirements of higher ring strength and lower heat generation level. In summary, how to develop a tire which has high strength, low heat generation and long distance adaptability and can simultaneously meet the use requirements of fuel vehicles and new energy electric vehicles has become a technical problem to be solved in the current industry. Disclosure of Invention The invention aims to provide a high-strength low-heat-generation tire bead and a preparation method thereof, so as to solve the problems in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a high-strength low-heat-generation tire bead, which comprises an airtight layer, a transition layer, an inner nylon layer, a steel wire bead, a tire body, an outer nylon layer and a tire side wear-resistant adhesive layer which are sequentially arranged from inside to outside; A medium-hardness buffer glue layer is further arranged between the inner nylon layer and the transition layer, and is used for enabling the transition layer, the medium-hardness buffer glue layer and the inner nylon layer to form a soft, hard and harder stepped reinforcing structure; the radial outer gap between the tire body and the steel wire seam allowance is also provided with a triangular glue layer for filling a gap between the tire body and the steel wire seam allowance, so that the structural stability of the high-strength low-heat-generation tire bead is improved; A high-strength low-heat-generation rubber layer is further arranged between the tire body and the outer nylon layer and used for isolating a tire body turn-up end point and enabling the tire body turn-up end point to be positioned in the center of an end point radial line H so as to inhibit deformation of the tire body turn-up end point and reduce the heat generation level of the tire bead of the high-strength low-heat-generation tire; The low-heat-generation rubber layer is further arranged between the outer nylon layer and the tire side wear-resistant rubber layer, and is used for forming a hard, soft and hard buffering shock-absorbing structure between the outer nylon layer and the tire side wear-resistant rubber layer so as to reduce high heat generation generated by hard contact of the outer nylon layer and the tire side wear-resistant rubber layer. In some embodiments, the inner nylon layer has a double-layer structure, and the height of the inner nylon layer exceeds the steel wire bead, so as to inhibit the deformation of the steel wire bead, thereby improving the strength of the high-strength low-heat-generation tire bead and reducing heat generation. In some embodiments, the inner nylon layer of the double-layer structure is arranged in parallel along the radial direction of the bead of the high-strength low-heat-generation tire, and the height of the inner nylon layer far away